     1                                  ; ****************************************************************************
     2                                  ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.2
     3                                  ; ----------------------------------------------------------------------------
     4                                  ; Last Update: 01/09/2020
     5                                  ; ----------------------------------------------------------------------------
     6                                  ; Beginning: 04/01/2016
     7                                  ; ----------------------------------------------------------------------------
     8                                  ; Assembler: NASM version 2.14 (trdos386.s)
     9                                  ; ----------------------------------------------------------------------------
    10                                  ; Turkish Rational DOS
    11                                  ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                                  ;
    13                                  ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                                  ; unix386.s (03/01/2016)
    15                                  ;
    16                                  ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    17                                  ; TRDOS2.ASM (09/11/2011)
    18                                  ; 
    19                                  ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    20                                  ; ****************************************************************************
    21                                  ; nasm trdos386.s -l trdos386.txt -o TRDOS386.SYS
    22                                  
    23                                  
    24                                  KLOAD	equ 10000h ; Kernel loading address
    25                                  	; NOTE: Retro UNIX 8086 v1 /boot code loads kernel at 1000h:0000h 
    26                                  KCODE	equ 08h	; Code segment descriptor (ring 0)
    27                                  KDATA	equ 10h	; Data segment descriptor (ring 0)
    28                                  ; 19/03/2015
    29                                  UCODE	equ 1Bh ; 18h + 3h  (ring 3)
    30                                  UDATA	equ 23h ; 20h + 3h  (ring 3)
    31                                  ; 24/03/2015
    32                                  TSS	equ 28h	; Task state segment descriptor (ring 0)
    33                                  ; 19/03/2015
    34                                  CORE	equ 400000h  ; Start of USER's virtual/linear address space 
    35                                  		     ; (at the end of the 1st 4MB)
    36                                  ECORE	equ 0FFC00000h ; End of USER's virtual address space (4GB - 4MB)
    37                                  		     ; ULIMIT = (ECORE/4096) - 1 = 0FFBFFh (in GDT)
    38                                  
    39                                  ;; 27/12/2013
    40                                  ;KEND    equ KLOAD + 65536 ; (28/12/2013) (end of kernel space)
    41                                  ; 04/07/2016
    42                                  KEND    equ KERNELFSIZE + KLOAD
    43                                  
    44                                  
    45                                  ; IBM PC/AT BIOS ----- 10/06/85 (postequ.inc)
    46                                  ;--------- CMOS TABLE LOCATION ADDRESS'S -------------------------------------
    47                                  CMOS_SECONDS	EQU	00H		; SECONDS (BCD)
    48                                  CMOS_SEC_ALARM	EQU	01H		; SECONDS ALARM (BCD)
    49                                  CMOS_MINUTES	EQU	02H		; MINUTES (BCD)
    50                                  CMOS_MIN_ALARM	EQU	03H		; MINUTES ALARM (BCD) 	
    51                                  CMOS_HOURS	EQU	04H		; HOURS (BCD
    52                                  CMOS_HR_ALARM	EQU	005H		; HOURS ALARM   (BCD)
    53                                  CMOS_DAY_WEEK	EQU	06H		; DAY OF THE WEEK  (BCD)
    54                                  CMOS_DAY_MONTH	EQU	07H		; DAY OF THE MONTH (BCD) 
    55                                  CMOS_MONTH	EQU	08H		; MONTH (BCD)
    56                                  CMOS_YEAR	EQU	09H		; YEAR (TWO DIGITS) (BCD)
    57                                  CMOS_CENTURY	EQU	32H		; DATE CENTURY BYTE (BCD)
    58                                  CMOS_REG_A	EQU	0AH		; STATUS REGISTER A
    59                                  CMOS_REG_B	EQU	00BH		; STATUS REGISTER B  ALARM
    60                                  CMOS_REG_C	EQU	00CH		; STATUS REGISTER C  FLAGS
    61                                  CMOS_REG_D	EQU	0DH		; STATUS REGISTER D  BATTERY
    62                                  CMOS_SHUT_DOWN	EQU	0FH		; SHUTDOWN STATUS COMMAND BYTE
    63                                  ;----------------------------------------
    64                                  ;	CMOS EQUATES FOR THIS SYSTEM	;
    65                                  ;-----------------------------------------------------------------------------
    66                                  CMOS_PORT	EQU	070H		; I/O ADDRESS OF CMOS ADDRESS PORT
    67                                  CMOS_DATA	EQU	071H		; I/O ADDRESS OF CMOS DATA PORT
    68                                  NMI		EQU	10000000B	; DISABLE NMI INTERRUPTS MASK -
    69                                  					; HIGH BIT OF CMOS LOCATION ADDRESS
    70                                  
    71                                  ; Memory Allocation Table Address
    72                                  ; 05/11/2014
    73                                  ; 31/10/2014
    74                                  MEM_ALLOC_TBL	equ	100000h		; Memory Allocation Table at the end of
    75                                  					; the 1st 1 MB memory space.
    76                                  					; (This address must be aligned
    77                                  					;  on 128 KB boundary, if it will be
    78                                  					;  changed later.)
    79                                  					; ((lower 17 bits of 32 bit M.A.T.
    80                                  					;   address must be ZERO)).
    81                                  					; ((((Reason: 32 bit allocation 
    82                                  					;     instructions, dword steps)))
    83                                  					; (((byte >> 12 --> page >> 5)))  
    84                                  ;04/11/2014	
    85                                  PDE_A_PRESENT	equ	1		; Present flag for PDE
    86                                  PDE_A_WRITE	equ 	2		; Writable (write permission) flag
    87                                  PDE_A_USER	equ	4		; User (non-system/kernel) page flag
    88                                  ;
    89                                  PTE_A_PRESENT	equ	1		; Present flag for PTE (bit 0)
    90                                  PTE_A_WRITE	equ 	2		; Writable (write permission) flag (bit 1)
    91                                  PTE_A_USER	equ	4		; User (non-system/kernel) page flag (bit 2)
    92                                  PTE_A_ACCESS    equ	32		; Accessed flag (bit 5) ; 09/03/2015
    93                                  
    94                                  ; 17/02/2015 (unix386.s)
    95                                  ; 10/12/2014 - 30/12/2014 (0B000h -> 9000h) (dsectrm2.s)
    96                                  DPT_SEGM equ 09000h  ; FDPT segment (EDD v1.1, EDD v3)
    97                                  ;
    98                                  HD0_DPT	 equ 0	    ; Disk parameter table address for hd0
    99                                  HD1_DPT	 equ 32	    ; Disk parameter table address for hd1
   100                                  HD2_DPT	 equ 64	    ; Disk parameter table address for hd2
   101                                  HD3_DPT	 equ 96	    ; Disk parameter table address for hd3
   102                                  
   103                                  
   104                                  ; FDPT (Phoenix, Enhanced Disk Drive Specification v1.1, v3.0)
   105                                  ;      (HDPT: Programmer's Guide to the AMIBIOS, 1993)
   106                                  ;
   107                                  FDPT_CYLS	equ 0 ; 1 word, number of cylinders
   108                                  FDPT_HDS	equ 2 ; 1 byte, number of heads
   109                                  FDPT_TT		equ 3 ; 1 byte, A0h = translated FDPT with logical values
   110                                  		      ; otherwise it is standard FDPT with physical values 	
   111                                  FDPT_PCMP	equ 5 ; 1 word, starting write precompensation cylinder
   112                                  		      ; (obsolete for IDE/ATA drives)
   113                                  FDPT_CB		equ 8 ; 1 byte, drive control byte
   114                                  			; Bits 7-6 : Enable or disable retries (00h = enable)
   115                                  			; Bit 5	: 1 = Defect map is located at last cyl. + 1
   116                                  			; Bit 4 : Reserved. Always 0
   117                                  			; Bit 3 : Set to 1 if more than 8 heads
   118                                  			; Bit 2-0 : Reserved. Alsways 0
   119                                  FDPT_LZ		equ 12 ; 1 word, landing zone (obsolete for IDE/ATA drives)
   120                                  FDPT_SPT	equ 14 ; 1 byte, sectors per track
   121                                  
   122                                  ; Floppy Drive Parameters Table (Programmer's Guide to the AMIBIOS, 1993)
   123                                  ; (11 bytes long) will be used by diskette handler/bios
   124                                  ; which is derived from IBM PC-AT BIOS (DISKETTE.ASM, 21/04/1986).
   125                                  
   126                                  ; 01/02/2016
   127                                  Logical_DOSDisks equ 90000h + 100h ; 26*256 = 6656 bytes
   128                                  Directory_Buffer equ 80000h ; max = 64K Bytes
   129                                  FAT_Buffer	 equ 91C00h ; 1536 bytes (3 sectors)
   130                                  ; 15/02/2016
   131                                  Cluster_Buffer	 equ 70000h ; max = 64K Bytes ; buffer for file read & write
   132                                  ; 11/04/2016
   133                                  Env_Page:	 equ 93000h ; 512 bytes (4096 bytes)
   134                                  Env_Page_Size	 equ 512    ; (4096 bytes)
   135                                  ; 30/07/2016
   136                                  Video_Pg_Backup	 equ 98000h ; Mode 3h, video page backup (32K, 8 pages)				 	  		 	  
   137                                  
   138                                  [BITS 16]       ; We need 16-bit intructions for Real mode
   139                                  
   140                                  [ORG 0] 
   141                                  	; 12/11/2014
   142                                  	; Save boot drive number (that is default root drive)
   143 00000000 8816[525D]              	mov	[boot_drv], dl ; physical drv number
   144                                  
   145                                  	; Determine installed memory
   146                                  	; 31/10/2014
   147                                  	;
   148 00000004 B801E8                  	mov	ax, 0E801h ; Get memory size 
   149 00000007 CD15                    	int	15h	   ; for large configurations
   150 00000009 7308                    	jnc	short chk_ms
   151 0000000B B488                    	mov	ah, 88h    ; Get extended memory size 
   152 0000000D CD15                    	int	15h
   153                                  	;	   
   154                                  	;mov	al, 17h	; Extended memory (1K blocks) low byte
   155                                  	;out	70h, al ; select CMOS register
   156                                  	;in	al, 71h ; read data (1 byte)
   157                                  	;mov	cl, al
   158                                  	;mov	al, 18h ; Extended memory (1K blocks) high byte
   159                                  	;out	70h, al ; select CMOS register
   160                                  	;in	al, 71h ; read data (1 byte)
   161                                  	;mov	ch, al
   162                                   	;      
   163 0000000F 89C1                    	mov	cx, ax
   164 00000011 31D2                    	xor	dx, dx
   165                                  chk_ms:
   166 00000013 890E[4E5D]              	mov	[mem_1m_1k], cx
   167 00000017 8916[505D]              	mov	[mem_16m_64k], dx
   168                                  	; 05/11/2014
   169                                  	;and	dx, dx
   170                                  	;jz	short L2
   171 0000001B 81F90004                        cmp     cx, 1024
   172 0000001F 7351                    	jnb	short L0
   173                                  		 ; insufficient memory_error	
   174                                  		 ; Minimum 2 MB memory is needed... 
   175                                  	; 05/11/2014
   176                                  	; (real mode error printing)
   177 00000021 FB                      	sti
   178 00000022 BE[3600]                	mov	si, msg_out_of_memory
   179 00000025 BB0700                  	mov	bx, 7
   180 00000028 B40E                    	mov	ah, 0Eh	; write tty
   181                                  oom_1:
   182 0000002A AC                      	lodsb
   183 0000002B 08C0                    	or	al, al
   184 0000002D 7404                    	jz	short oom_2
   185 0000002F CD10                    	int	10h
   186 00000031 EBF7                    	jmp	short oom_1
   187                                  oom_2:
   188 00000033 F4                              hlt
   189 00000034 EBFD                    	jmp	short oom_2
   190                                  
   191                                  ; 20/02/2017
   192                                  ; 05/11/2014
   193                                  msg_out_of_memory:
   194 00000036 070D0A                  	db 	07h, 0Dh, 0Ah
   195 00000039 496E73756666696369-             db      'Insufficient memory !'
   195 00000042 656E74206D656D6F72-
   195 0000004B 792021             
   196 0000004E 0D0A                    	db	0Dh, 0Ah
   197                                  _int13h_48h_buffer: ; 07/07/2016
   198 00000050 284D696E696D756D20-     	db	'(Minimum 2MB memory is needed.)'
   198 00000059 324D42206D656D6F72-
   198 00000062 79206973206E656564-
   198 0000006B 65642E29           
   199 0000006F 0D0A00                   	db	0Dh, 0Ah, 0
   200                                  	;
   201                                  
   202                                  L0:
   203                                  %include 'diskinit.s' ; 07/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.2 - diskinit.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 29/08/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.14 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; diskinit.inc (10/07/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - DISKINIT.INC
    20                              <1> ; Last Modification: 10/07/2015
    21                              <1> 
    22                              <1> ; DISK I/O SYSTEM INITIALIZATION - Erdogan Tan (Retro UNIX 386 v1 project)
    23                              <1> 
    24                              <1> ; ///////// DISK I/O SYSTEM STRUCTURE INITIALIZATION ///////////////
    25                              <1> 
    26                              <1> 	; 29/08/2020
    27                              <1> 	; 17/07/2020
    28                              <1> 	; 14/07/2020 (TRDOS 386 v2.0.2)
    29                              <1> 	; 10/12/2014 - 02/02/2015 - dsectrm2.s
    30                              <1> ;L0:
    31                              <1> 	; 12/11/2014 (Retro UNIX 386 v1 - beginning)
    32                              <1> 	; Detecting disk drives... (by help of ROM-BIOS)
    33 00000072 BA7F00              <1> 	mov	dx, 7Fh
    34                              <1> L1:	
    35 00000075 FEC2                <1> 	inc	dl
    36 00000077 B441                <1> 	mov	ah, 41h ; Check extensions present
    37                              <1> 			; Phoenix EDD v1.1 - EDD v3
    38 00000079 BBAA55              <1> 	mov	bx, 55AAh
    39 0000007C CD13                <1> 	int 	13h
    40 0000007E 721A                <1> 	jc	short L2
    41                              <1> 
    42 00000080 81FB55AA            <1> 	cmp	bx, 0AA55h
    43 00000084 7514                <1> 	jne	short L2
    44 00000086 FE06[555D]          <1> 	inc	byte [hdc]	; count of hard disks (EDD present)
    45 0000008A 8816[545D]          <1>         mov     [last_drv], dl  ; last hard disk number
    46 0000008E BB[D85C]            <1> 	mov	bx, hd0_type - 80h
    47 00000091 01D3                <1> 	add	bx, dx	 
    48 00000093 880F                <1> 	mov	[bx], cl ; Interface support bit map in CX
    49                              <1> 			 ; Bit 0 - 1, Fixed disk access subset ready
    50                              <1> 			 ; Bit 1 - 1, Drv locking and ejecting ready
    51                              <1> 			 ; Bit 2 - 1, Enhanced Disk Drive Support
    52                              <1>                          ;            (EDD) ready (DPTE ready)
    53                              <1> 			 ; Bit 3 - 1, 64bit extensions are present
    54                              <1>                          ;            (EDD-3)
    55                              <1> 			 ; Bit 4 to 15 - 0, Reserved
    56 00000095 80FA83              <1> 	cmp	dl, 83h	 ; drive number < 83h
    57 00000098 72DB                <1> 	jb	short L1
    58                              <1> L2:
    59                              <1> 	; 23/11/2014
    60                              <1> 	; 19/11/2014
    61 0000009A 30D2                <1> 	xor	dl, dl  ; 0
    62                              <1> 	; 04/02/2016 (esi -> si)
    63 0000009C BE[565D]            <1> 	mov	si, fd0_type
    64                              <1> L3:
    65                              <1> 	; 14/01/2015
    66 0000009F 8816[535D]          <1> 	mov	[drv], dl
    67                              <1> 	;
    68 000000A3 B408                <1> 	mov 	ah, 08h ; Return drive parameters
    69 000000A5 CD13                <1> 	int	13h	
    70 000000A7 7210                <1> 	jc	short L4
    71                              <1> 		; BL = drive type (for floppy drives)
    72                              <1> 		; DL = number of floppy drives
    73                              <1> 		;		
    74                              <1> 		; ES:DI = Address of DPT from BIOS
    75                              <1> 		;
    76 000000A9 881C                <1> 	mov	[si], bl ;  Drive type
    77                              <1> 			; 4 = 1.44 MB, 80 track, 3 1/2"
    78                              <1> 	; 14/01/2015
    79 000000AB E8DE01              <1> 	call	set_disk_parms
    80                              <1> 	; 10/12/2014
    81 000000AE 81FE[565D]          <1> 	cmp	si, fd0_type
    82 000000B2 7705                <1> 	ja	short L4
    83 000000B4 46                  <1> 	inc	si ; fd1_type
    84 000000B5 B201                <1> 	mov	dl, 1
    85 000000B7 EBE6                <1> 	jmp	short L3
    86                              <1> L4:
    87 000000B9 B27F                <1> 	mov	dl, 7Fh
    88                              <1> 	; 24/12/2014
    89 000000BB 803E[555D]00        <1> 	cmp	byte [hdc], 0 ; EDD present or not ?	
    90 000000C0 0F878700            <1>         ja      L10       ; yes, all fixed disk operations
    91                              <1> 			  ; will be performed according to
    92                              <1> 			  ; present EDD specification
    93                              <1> 
    94                              <1> 	; 17/07/2020
    95                              <1> 	; Note: Virtual CPU will not come here while 
    96                              <1> 	; running in QEMU, Bochs, VirtualBox emulators !!!
    97                              <1> 	
    98                              <1> 	; 17/07/2020
    99                              <1> 	; Older BIOS (INT 13h, AH = 48h is not available)
   100                              <1> L6:
   101 000000C4 FEC2                <1> 	inc 	dl
   102 000000C6 8816[535D]          <1>         mov     [drv], dl
   103 000000CA 8816[545D]          <1>         mov     [last_drv], dl ; 14/01/2015
   104 000000CE B408                <1> 	mov 	ah, 08h ; Return drive parameters
   105 000000D0 CD13                <1> 	int	13h	; (conventional function)
   106 000000D2 0F82A801            <1>         jc      L13	; fixed disk drive not ready
   107 000000D6 8816[555D]          <1>         mov     [hdc], dl ; number of drives
   108                              <1> 	;; 14/01/2013
   109                              <1> 	;;push	cx
   110 000000DA E8AF01              <1> 	call	set_disk_parms
   111                              <1> 	;;pop	cx
   112                              <1> 	;
   113                              <1> 	;;and	cl, 3Fh	 ; sectors per track (bits 0-6)
   114 000000DD 8A16[535D]          <1>         mov     dl, [drv]
   115 000000E1 BB0401              <1> 	mov	bx, 65*4 ; hd0 parameters table (INT 41h)	
   116 000000E4 80FA80              <1> 	cmp	dl, 80h
   117 000000E7 7603                <1> 	jna	short L7
   118 000000E9 83C314              <1> 	add	bx, 5*4	 ; hd1 parameters table (INT 46h)
   119                              <1> L7:	
   120 000000EC 31C0                <1> 	xor	ax, ax
   121 000000EE 8ED8                <1> 	mov	ds, ax
   122 000000F0 8B37                <1>         mov     si, [bx]
   123 000000F2 8B4702              <1>         mov     ax, [bx+2] 
   124 000000F5 8ED8                <1> 	mov	ds, ax
   125 000000F7 3A4C0E              <1>         cmp     cl, [si+FDPT_SPT] ; sectors per track 
   126 000000FA 0F857C01            <1>         jne     L12 ; invalid FDPT
   127 000000FE BF0000              <1> 	mov	di, HD0_DPT
   128 00000101 80FA80              <1> 	cmp	dl, 80h
   129 00000104 7603                <1> 	jna	short L8
   130 00000106 BF2000              <1> 	mov	di, HD1_DPT 
   131                              <1> L8:
   132                              <1> 	; 30/12/2014
   133 00000109 B80090              <1> 	mov	ax, DPT_SEGM
   134 0000010C 8EC0                <1> 	mov	es, ax
   135                              <1> 	; 24/12/2014
   136 0000010E B90800              <1> 	mov	cx, 8
   137 00000111 F3A5                <1> 	rep	movsw  ; copy 16 bytes to the kernel's DPT location
   138 00000113 8CC8                <1> 	mov	ax, cs
   139 00000115 8ED8                <1> 	mov	ds, ax
   140                              <1> 
   141                              <1> 	; 02/02/2015
   142                              <1> 	;mov	cl, [drv]
   143                              <1> 	;mov	bl, cl
   144                              <1> 	;mov	ax, 1F0h
   145                              <1> 	;and	bl, 1
   146                              <1> 	;jz	short L9
   147                              <1> 	;shl	bl, 4
   148                              <1> 	;sub	ax, 1F0h-170h
   149                              <1> 
   150                              <1> 	; 17/07/2020 
   151                              <1> 	; (Only 1F0h port address must be valid for old ROM BIOSes)
   152 00000117 B8F001              <1> 	mov	ax, 1F0h
   153 0000011A B3A0                <1> 	mov	bl, 0A0h
   154 0000011C 80FA80              <1> 	cmp	dl, 80h
   155 0000011F 7603                <1> 	jna	short L9
   156                              <1> 	; dl = 81h
   157 00000121 80C310              <1> 	add	bl, 10h  ; slave disk
   158                              <1> 	;sub	ax, 1F0h-170h
   159                              <1> L9:
   160 00000124 AB                  <1> 	stosw	; I/O PORT Base Address (1F0h, 170h)
   161 00000125 050602              <1> 	add	ax, 206h
   162 00000128 AB                  <1> 	stosw	; CONTROL PORT Address (3F6h, 376h)	
   163 00000129 88D8                <1> 	mov	al, bl  ; bit 4, master/slave disk bit
   164                              <1> 	;add	al, 0A0h ; 17/07/2020
   165 0000012B AA                  <1> 	stosb	; Device/Head Register upper nibble
   166                              <1> 	;
   167 0000012C FE06[535D]          <1> 	inc	byte [drv]
   168 00000130 BB[D85C]            <1> 	mov	bx, hd0_type - 80h
   169 00000133 01CB                <1> 	add	bx, cx
   170 00000135 800F80              <1>         or      byte [bx], 80h  ; present sign (when lower nibble is 0)
   171 00000138 A0[555D]            <1> 	mov	al, [hdc]
   172 0000013B FEC8                <1> 	dec	al
   173 0000013D 0F843D01            <1>         jz      L13
   174 00000141 80FA80              <1> 	cmp	dl, 80h
   175 00000144 0F867CFF            <1>         jna	L6 ; Max. 2 hard disks  ; 17/07/2020 
   176 00000148 E93301              <1>         jmp     L13
   177                              <1> L10:
   178 0000014B FEC2                <1> 	inc 	dl
   179                              <1> 	; 25/12/2014
   180 0000014D 8816[535D]          <1> 	mov	[drv], dl
   181 00000151 B408                <1> 	mov 	ah, 08h ; Return drive parameters
   182 00000153 CD13                <1> 	int	13h	; (conventional function)
   183 00000155 0F822501            <1>         jc      L13
   184                              <1> 	; 14/01/2015
   185 00000159 8A16[535D]          <1> 	mov	dl, [drv]
   186 0000015D 52                  <1> 	push	dx
   187 0000015E 51                  <1> 	push	cx
   188 0000015F E82A01              <1> 	call	set_disk_parms
   189 00000162 59                  <1> 	pop	cx
   190 00000163 5A                  <1> 	pop	dx
   191                              <1> 	; 06/07/2016 (BugFix for >64K kernel files)
   192                              <1> 	; 04/02/2016 (esi -> si)
   193                              <1> 	;mov	si, _end ; 30 byte temporary buffer address 	
   194                              <1> 	;		 ; at the '_end' of kernel.
   195                              <1> 	;mov	word [si], 30
   196                              <1> 	; 06/07/2016
   197 00000164 BE[5000]            <1> 	mov	si, _int13h_48h_buffer
   198                              <1> 	; 09/07/2016
   199 00000167 B81E00              <1> 	mov	ax, 001Eh
   200 0000016A 8824                <1> 	mov	[si], ah ; 0
   201 0000016C 46                  <1> 	inc	si
   202 0000016D 8904                <1> 	mov	word [si], ax
   203                              <1>  	; word [si] = 30
   204                              <1> 	;
   205 0000016F B448                <1> 	mov	ah, 48h	 ; Get drive parameters (EDD function)
   206 00000171 CD13                <1> 	int	13h
   207 00000173 0F820701            <1>         jc      L13
   208                              <1> 
   209                              <1> 	; 29/08/2020
   210                              <1> 	; 04/02/2016 (ebx -> bx)
   211                              <1> 	; 14/01/2015
   212 00000177 28FF                <1> 	sub	bh, bh
   213 00000179 88D3                <1> 	mov	bl, dl
   214                              <1> 	;sub	bl, 80h
   215                              <1> 	; 29/08/2020
   216 0000017B 81C3[D85C]          <1> 	add	bx, (hd0_type - 80h)
   217                              <1> 	;mov 	al, [bx]
   218 0000017F 8A07                <1> 	mov	al, [bx]
   219 00000181 0C80                <1> 	or	al, 80h
   220 00000183 8807                <1> 	mov 	[bx], al	
   221 00000185 81EB[565D]          <1> 	sub	bx, hd0_type - 2 ; 15/01/2015
   222                              <1> 	;add	bx, drv.status
   223                              <1> 	;mov	[bx], al
   224                              <1> 	; 29/08/2020
   225 00000189 8887[A25D]          <1> 	mov	[bx+drv.status], al
   226                              <1> 	; 04/02/2016 (eax -> ax)
   227                              <1> 	;mov	ax, [si+16]
   228                              <1> 	; 14/07/2020
   229                              <1> 	;mov	di, [si+18] 
   230                              <1> 	;;test	ax, [si+18]
   231                              <1> 	;test	ax, di ; 14/07/2020
   232                              <1> 	;jz	short L10_A0h ; (!) ; 17/07/2020
   233                              <1> 			; 'CHS only' disks on EDD system 
   234                              <1> 			;  are reported with ZERO disk size
   235                              <1> 			; (if so, we must not overwrite
   236                              <1> 			; calculated disk size in 'set_disk_parms')
   237                              <1> 	; 29/08/2020
   238 0000018D 8B4410              <1> 	mov	ax, [si+16]
   239 00000190 8B7C12              <1> 	mov	di, [si+18]
   240 00000193 09C0                <1> 	or	ax, ax
   241 00000195 7504                <1> 	jnz	short L10_LBA
   242 00000197 09FF                <1> 	or	di, di
   243 00000199 740B                <1> 	jz	short L10_A0h
   244                              <1> L10_LBA:
   245                              <1> 	;sub	bx, drv.status
   246 0000019B C1E302              <1> 	shl	bx, 2
   247                              <1> 	;add	bx, drv.size ; disk size (in sectors)
   248                              <1> 	;mov	[bx], ax
   249                              <1> 	; 29/08/2020
   250 0000019E 8987[865D]          <1> 	mov	[bx+drv.size], ax
   251                              <1> 	;mov	ax, [si+18]
   252                              <1> 	;;mov	[bx], ax
   253                              <1> 	;mov	[bx+2], ax ; BugFix ; 15/07/2020
   254                              <1> 	; 14/07/2020
   255                              <1> 	;mov	[bx+2], di ; 15/07/2020
   256                              <1> 	; 29/08/2020
   257 000001A2 89BF[885D]          <1> 	mov	[bx+drv.size+2], di
   258                              <1> L10_A0h: 
   259                              <1> 	; 17/07/2020
   260                              <1> 	; Note: Virtual CPU will jump here from above (!) test
   261                              <1> 	;	while running in QEMU
   262                              <1> 
   263                              <1> 	; Jump here to fix a ZERO (LBA) disk size problem 
   264                              <1> 	; for CHS disks (28/02/2015)
   265                              <1> 	
   266                              <1> 	; 30/12/2014
   267 000001A6 BF0000              <1> 	mov	di, HD0_DPT
   268 000001A9 88D0                <1> 	mov	al, dl
   269 000001AB 83E003              <1> 	and 	ax, 3
   270 000001AE C0E005              <1> 	shl	al, 5 ; * 32
   271 000001B1 01C7                <1> 	add 	di, ax
   272 000001B3 B80090              <1> 	mov	ax, DPT_SEGM
   273 000001B6 8EC0                <1> 	mov	es, ax
   274                              <1> 	;
   275 000001B8 88E8                <1> 	mov	al, ch	; max. cylinder number (bits 0-7)
   276 000001BA 88CC                <1> 	mov	ah, cl	
   277 000001BC C0EC06              <1> 	shr	ah, 6	; max. cylinder number (bits 8-9)
   278 000001BF 40                  <1>  	inc	ax	; logical cylinders (limit 1024)
   279 000001C0 AB                  <1> 	stosw		
   280 000001C1 88F0                <1> 	mov	al, dh	; max. head number
   281                              <1> 	;
   282 000001C3 30F6                <1> 	xor	dh, dh  ; 29/08/2020 (dh = 0 is needed here)
   283                              <1> 	;
   284 000001C5 FEC0                <1> 	inc	al
   285 000001C7 AA                  <1> 	stosb		; logical heads (limits 256)
   286 000001C8 B0A0                <1> 	mov	al, 0A0h ; Indicates translated table
   287 000001CA AA                  <1> 	stosb
   288 000001CB 8A440C              <1> 	mov	al, [si+12]
   289 000001CE AA                  <1> 	stosb		 ; physical sectors per track
   290 000001CF 31C0                <1>  	xor	ax, ax
   291                              <1> 	;dec	ax	 ; 02/01/2015 
   292 000001D1 AB                  <1> 	stosw		 ; precompensation (obsolete)
   293                              <1> 	;xor	al, al	 ; 02/01/2015	
   294 000001D2 AA                  <1> 	stosb		 ; reserved
   295 000001D3 B008                <1> 	mov	al, 8	 ; drive control byte
   296                              <1> 		         ; (do not disable retries, 
   297                              <1> 			 ; more than 8 heads)
   298 000001D5 AA                  <1> 	stosb
   299 000001D6 8B4404              <1> 	mov	ax, [si+4]
   300 000001D9 AB                  <1> 	stosw		 ; physical number of cylinders	
   301                              <1> 	;push	ax	 ; 02/01/2015
   302 000001DA 8A4408              <1> 	mov	al, [si+8]
   303 000001DD AA                  <1> 	stosb		 ; physical num. of heads (limit 16)
   304 000001DE 29C0                <1> 	sub 	ax, ax
   305                              <1> 	;pop	ax	 ; 02/01/2015	
   306 000001E0 AB                  <1> 	stosw		 ; landing zone (obsolete)
   307 000001E1 88C8                <1> 	mov	al, cl	 ; logical sectors per track (limit 63)
   308 000001E3 243F                <1> 	and 	al, 3Fh	
   309 000001E5 AA                  <1> 	stosb
   310                              <1> 	;sub	al, al	 ; checksum
   311                              <1> 	;stosb
   312                              <1> 	;
   313 000001E6 83C61A              <1> 	add	si, 26   ; (BIOS) DPTE address pointer
   314 000001E9 AD                  <1> 	lodsw
   315 000001EA 50                  <1> 	push	ax ; *	 ; (BIOS) DPTE offset
   316 000001EB AD                  <1> 	lodsw
   317 000001EC 50                  <1> 	push	ax ; **	 ; (BIOS) DPTE segment
   318                              <1> 	;
   319                              <1> 	; checksum calculation
   320 000001ED 89FE                <1> 	mov	si, di
   321 000001EF 06                  <1> 	push	es
   322 000001F0 1F                  <1> 	pop	ds
   323                              <1> 	;mov	cx, 16
   324 000001F1 B90F00              <1> 	mov 	cx, 15
   325 000001F4 29CE                <1> 	sub	si, cx
   326 000001F6 30E4                <1> 	xor	ah, ah
   327                              <1> 	;del	cl
   328                              <1> L11:		
   329 000001F8 AC                  <1> 	lodsb
   330 000001F9 00C4                <1> 	add	ah, al
   331 000001FB E2FB                <1> 	loop	L11
   332                              <1> 	;
   333 000001FD 88E0                <1> 	mov	al, ah
   334 000001FF F6D8                <1> 	neg	al	; -x+x = 0
   335 00000201 AA                  <1> 	stosb		; put checksum in byte 15 of the tbl
   336                              <1> 	;
   337 00000202 1F                  <1> 	pop	ds ; **	; (BIOS) DPTE segment
   338 00000203 5E                  <1> 	pop	si ; *	; (BIOS) DPTE offset	
   339                              <1> 	;
   340                              <1> 	; 14/07/2020
   341                              <1> 	; 0FFFFh:0FFFFh = invalid DPTE address
   342 00000204 8B0C                <1> 	mov	cx, [si]
   343 00000206 8B4402              <1> 	mov	ax, [si+2]
   344 00000209 21C1                <1> 	and	cx, ax
   345 0000020B 41                  <1> 	inc	cx 
   346 0000020C 7404                <1> 	jz	short L11c ; 0FFFFh:0FFFFh
   347 0000020E 0B04                <1> 	or	ax, [si]
   348 00000210 752A                <1> 	jnz	short L11e ; <> 0
   349                              <1> L11c:
   350                              <1> 	; 17/07/2020
   351                              <1> 	; TRDOS 386 v2 DRVINIT assumptions:
   352                              <1> 	; (also by regarding QEMU, Bochs and VirtualBox settings)
   353                              <1> 	;	Hard disk 0 port address: 1F0h
   354                              <1> 	;	Hard disk 1 port address: 1F0h
   355                              <1> 	;	Hard disk 2 port address: 170h
   356                              <1> 	;	Hard disk 3 port address: 170h
   357                              <1> 
   358                              <1> 	; in QEMU, hda=hd0 (1F0h) and hdb=hd1 (1F0h) -IRQ14-
   359                              <1> 	;      and hdc=hd2 (170h) and hdd=hd3 (170h) -IRQ15-
   360                              <1> 
   361 00000212 B8F001              <1> 	mov	ax, 1F0h
   362                              <1> 
   363                              <1> 	; 15/07/2020
   364                              <1> 	; 14/07/2020
   365                              <1> 	; Invalid DPTE address...
   366                              <1> 	; Default DPTE parms must be set for DISK_IO_CONT
   367                              <1> 	; (diskio.s)
   368                              <1> 	; 17/07/2020
   369                              <1> 
   370                              <1> 	;mov	bl, dl
   371                              <1> 	;and	bl, 1
   372                              <1> 	;jz	short L11d
   373                              <1> 
   374 00000215 B3A0                <1> 	mov	bl, 0A0h
   375                              <1> 
   376 00000217 F6C201              <1> 	test	dl, 1
   377 0000021A 7403                <1> 	jz	short L11g  ; Master (as default, for 80h & 82h))
   378                              <1> 	;shl	bl, 4 ; bl = 16 (bit 4 = 1 -> slave)
   379 0000021C 80C310              <1> 	add	bl, 10h  ; Slave (as default, for 81h & 83h)
   380                              <1> L11g:
   381                              <1> 	; 17/07/2020
   382 0000021F 80FA82              <1> 	cmp	dl, 82h	; Hard disk 3 or 4 ?
   383 00000222 7203                <1> 	jb	short L11d ; Primary ATA channel (hd0, hd1)
   384                              <1> 			   ; (port address = 1F0h)
   385                              <1> 	
   386                              <1> 	; Secondary ATA channel (hd2, hd3)
   387                              <1> 	; (port address = 170h)
   388                              <1> 
   389 00000224 2D8000              <1> 	sub	ax, 1F0h-170h
   390                              <1> L11d:
   391                              <1> 	; 14/07/2020
   392 00000227 AB                  <1> 	stosw	; I/O PORT Base Address (1F0h, 170h)
   393 00000228 050602              <1> 	add	ax, 206h
   394 0000022B AB                  <1> 	stosw	; CONTROL PORT Address (3F6h, 376h)	
   395 0000022C 88D8                <1> 	mov	al, bl  ; Master/Slave bit (0 = Master)
   396                              <1> 	; 17/07/2020
   397                              <1> 	;or	al, 0A0h ; CHS (LBA enable bit = 0)
   398                              <1> 			 ; (Bits 5&7, reserved bits  =  1)
   399 0000022E 30E4                <1> 	xor	ah, ah
   400                              <1> 	;stosb	; Device/Head Register upper nibble
   401 00000230 AB                  <1> 	stosw
   402 00000231 30C0                <1> 	xor	al, al
   403 00000233 B90500              <1> 	mov	cx, 5
   404 00000236 F3AB                <1> 	rep	stosw ; clear remain part of the (fake) DPTE
   405 00000238 0E                  <1> 	push	cs
   406 00000239 1F                  <1> 	pop	ds
   407 0000023A EB2E                <1> 	jmp	short L11f
   408                              <1> L11e:
   409                              <1> 	; 23/02/2015
   410 0000023C 57                  <1> 	push	di
   411                              <1> 	; ES:DI points to DPTE (FDPTE) location
   412                              <1> 	;;mov	cx, 8
   413                              <1> 	;mov	cl, 8
   414 0000023D B90800              <1> 	mov	cx, 8 ; 14/07/2020
   415 00000240 F3A5                <1> 	rep	movsw	
   416                              <1> 	;
   417                              <1> 	; 23/02/2015
   418                              <1> 	; (P)ATA drive and LBA validation
   419                              <1> 	; (invalidating SATA drives and setting
   420                              <1> 	; CHS type I/O for old type fixed disks)
   421 00000242 5B                  <1> 	pop	bx
   422 00000243 8CC8                <1> 	mov	ax, cs
   423 00000245 8ED8                <1> 	mov	ds, ax
   424 00000247 268B07              <1> 	mov	ax, [es:bx]
   425 0000024A 3DF001              <1> 	cmp	ax, 1F0h
   426 0000024D 7413                <1> 	je	short L11a
   427 0000024F 3D7001              <1> 	cmp	ax, 170h
   428 00000252 740E                <1> 	je	short L11a
   429                              <1> 	; invalidation 
   430                              <1> 	; (because base port address is not 1F0h or 170h)
   431                              <1> 	;xor	bh, bh
   432                              <1> 	;mov	bl, dl
   433                              <1> 	; 29/08/2020
   434                              <1> 	;xor	dh, dh ; 0
   435 00000254 89D3                <1> 	mov	bx, dx
   436                              <1> 	;sub	bl, 80h
   437                              <1> 	;mov	byte [bx+hd0_type], 0 ; not a valid disk drive !		
   438                              <1>         ;or	byte [bx+drv.status+2], 0F0h ; (failure sign)
   439                              <1> 	; 29/08/2020
   440 00000256 C687[D85C]00        <1> 	mov	byte [bx+hd0_type-80h], 0
   441 0000025B 808F[245D]F0        <1> 	or	byte [bx+drv.status-7Eh], 0F0h
   442 00000260 EB0F                <1> 	jmp	short L11b
   443                              <1> L11a:	
   444                              <1> 	; LBA validation
   445 00000262 268A4704            <1> 	mov	al, [es:bx+4] ; Head register upper nibble
   446 00000266 A840                <1> 	test	al, 40h ; LBA bit (bit 6)
   447 00000268 7507                <1> 	jnz	short L11b ; LBA type I/O is OK! (E0h or F0h)
   448                              <1> L11f:
   449                              <1> 	; force CHS type I/O for this drive (A0h or B0h)
   450                              <1> 	;sub	bh, bh
   451                              <1> 	;mov	bl, dl
   452                              <1> 	; 29/08/2020
   453                              <1> 	;xor	dh, dh ; 0
   454 0000026A 89D3                <1> 	mov	bx, dx
   455                              <1> 	;sub	bl, 80h ; 26/02/2015
   456                              <1>         ;and	byte [bx+drv.status+2], 0FEh ; clear bit 0
   457                              <1> 				; bit 0 = LBA ready bit
   458                              <1> 	; 29/08/2020
   459 0000026C 80A7[245D]FE        <1> 	and	byte [bx+drv.status-7Eh], 0FEh
   460                              <1> 	; 'diskio' procedure will check this bit !
   461                              <1> L11b:
   462 00000271 3A16[545D]          <1> 	cmp	dl, [last_drv] ; 25/12/2014
   463 00000275 7307                <1>         jnb     short L13
   464 00000277 E9D1FE              <1>         jmp     L10
   465                              <1> 
   466                              <1> L12:
   467                              <1> 	; Restore data registers
   468 0000027A 8CC8                <1> 	mov	ax, cs
   469 0000027C 8ED8                <1> 	mov	ds, ax	
   470                              <1> L13:
   471                              <1> 	; 13/12/2014
   472 0000027E 0E                  <1> 	push	cs
   473 0000027F 07                  <1> 	pop	es
   474                              <1> L14:
   475                              <1> 	; clear keyboard buffer
   476 00000280 B411                <1> 	mov 	ah, 11h
   477 00000282 CD16                <1> 	int 	16h
   478 00000284 744D                <1> 	jz 	short L16 ; no keys in keyboard buffer
   479 00000286 B010                <1> 	mov	al, 10h
   480 00000288 CD16                <1> 	int 	16h
   481 0000028A EBF4                <1> 	jmp 	short L14
   482                              <1> 
   483                              <1> set_disk_parms:
   484                              <1> 	; 29/08/2020
   485                              <1> 	; 04/02/2016 (ebx -> bx)
   486                              <1> 	; 10/07/2015
   487                              <1> 	; 14/01/2015
   488                              <1> 	;push	bx
   489 0000028C 28FF                <1> 	sub	bh, bh
   490 0000028E 8A1E[535D]          <1> 	mov	bl, [drv]
   491 00000292 80FB80              <1> 	cmp	bl, 80h
   492 00000295 7203                <1> 	jb	short sdp0
   493 00000297 80EB7E              <1> 	sub	bl, 7Eh
   494                              <1> sdp0:	
   495                              <1> 	;add	bx, drv.status
   496                              <1>   	;mov	byte [bx], 80h ; 'Present' flag
   497                              <1> 	; 29/08/2020
   498 0000029A C687[A25D]80        <1> 	mov	byte [bx+drv.status], 80h
   499                              <1> 	;
   500 0000029F 88E8                <1> 	mov	al, ch ; last cylinder (bits 0-7)
   501 000002A1 88CC                <1> 	mov	ah, cl ; 
   502 000002A3 C0EC06              <1> 	shr	ah, 6  ; last cylinder (bits 8-9)
   503                              <1> 	;sub	bx, drv.status
   504 000002A6 D0E3                <1> 	shl	bl, 1
   505                              <1> 	;add	bx, drv.cylinders
   506 000002A8 40                  <1> 	inc	ax  ; convert max. cyl number to cyl count		
   507                              <1> 	;mov	[bx], ax
   508                              <1> 	; 29/08/2020
   509 000002A9 8987[5C5D]          <1> 	mov	[bx+drv.cylinders], ax
   510 000002AD 50                  <1> 	push	ax ; ** cylinders
   511                              <1> 	;sub	bx, drv.cylinders
   512                              <1> 	;add	bx, drv.heads
   513 000002AE 30E4                <1> 	xor	ah, ah
   514 000002B0 88F0                <1> 	mov	al, dh ; heads
   515 000002B2 40                  <1> 	inc	ax
   516                              <1> 	;mov	[bx], ax
   517                              <1> 	; 29/08/2020
   518 000002B3 8987[6A5D]          <1>         mov	[bx+drv.heads], ax
   519                              <1> 	;sub     bx, drv.heads
   520                              <1>         ;add     bx, drv.spt
   521 000002B7 30ED                <1> 	xor	ch, ch
   522 000002B9 80E13F              <1> 	and	cl, 3Fh	; sectors (bits 0-6)
   523                              <1> 	;mov	[bx], cx
   524                              <1>         ; 29/08/2020
   525 000002BC 898F[785D]          <1> 	mov	[bx+drv.spt], cx
   526                              <1> 	;sub	bx, drv.spt
   527 000002C0 D1E3                <1> 	shl	bx, 1
   528                              <1> 	;add	bx, drv.size ; disk size (in sectors)
   529                              <1> 	; LBA size = cylinders * heads * secpertrack
   530 000002C2 F7E1                <1> 	mul	cx 
   531 000002C4 89C2                <1> 	mov	dx, ax	; heads*spt					
   532 000002C6 58                  <1> 	pop	ax ; ** cylinders
   533 000002C7 48                  <1> 	dec	ax ; 1 cylinder reserved (!?)
   534 000002C8 F7E2                <1> 	mul	dx ; cylinders * (heads*spt)		
   535                              <1> 	;mov	[bx], ax
   536                              <1> 	;mov	[bx+2], dx
   537                              <1> 	; 29/08/2020
   538 000002CA 8987[865D]          <1> 	mov	[bx+drv.size], ax
   539 000002CE 8997[885D]          <1> 	mov	[bx+drv.size+2], dx
   540                              <1> 	;
   541                              <1> 	;pop	bx
   542 000002D2 C3                  <1> 	retn
   543                              <1> 
   544                              <1> L16:	; 28/05/2016
   204                                  
   205                                  	; 10/11/2014
   206 000002D3 FA                           	cli	; Disable interrupts (clear interrupt flag)
   207                                  		; Reset Interrupt MASK Registers (Master&Slave)
   208                                  	;mov	al, 0FFh	; mask off all interrupts
   209                                  	;out	21h, al		; on master PIC (8259)
   210                                  	;jmp 	$+2  ; (delay)
   211                                  	;out	0A1h, al	; on slave PIC (8259)
   212                                  	;
   213                                  	; Disable NMI 
   214 000002D4 B080                    	mov   	al, 80h 
   215 000002D6 E670                    	out   	70h, al		; set bit 7 to 1 for disabling NMI
   216                                  	;23/02/2015
   217                                  	;nop			;
   218                                  	;in	al, 71h		; read in 71h just after writing out to 70h
   219                                  				; for preventing unknown state (!?)
   220                                  	;
   221                                   	; 20/08/2014
   222                                  	; Moving the kernel 64 KB back (to physical address 0)
   223                                  	; DS = CS = 1000h
   224                                  	; 05/11/2014
   225 000002D8 31C0                    	xor	ax, ax
   226 000002DA 8EC0                    	mov	es, ax ; ES = 0
   227                                  	;
   228                                  	; 04/07/2016 -  TRDOS 386 (64K - 128K kernel)
   229 000002DC 31F6                          	xor	si, si
   230 000002DE 31FF                    	xor	di, di
   231 000002E0 B90040                  	mov	cx, 16384
   232 000002E3 F366A5                  	rep	movsd
   233                                  	;
   234 000002E6 06                      	push	es ; 0
   235 000002E7 68[EB02]                	push	L17
   236 000002EA CB                      	retf
   237                                  L17:
   238 000002EB B90010                  	mov	cx, 1000h
   239 000002EE 8EC1                    	mov	es, cx  ; 1000h 
   240 000002F0 01C9                    	add	cx, cx
   241 000002F2 8ED9                    	mov	ds, cx  ; 2000h
   242 000002F4 29F6                    	sub	si, si
   243 000002F6 29FF                    	sub	di, di
   244 000002F8 B90040                  	mov	cx, 16384
   245 000002FB F366A5                  	rep	movsd
   246                                  	
   247                                  	; Turn off the floppy drive motor
   248 000002FE BAF203                          mov     dx, 3F2h
   249 00000301 EE                              out     dx, al ; 0 ; 31/12/2013
   250                                  
   251                                  	; Enable access to memory above one megabyte
   252                                  L18:
   253 00000302 E464                    	in	al, 64h
   254 00000304 A802                    	test	al, 2
   255 00000306 75FA                            jnz     short L18
   256 00000308 B0D1                    	mov	al, 0D1h	; Write output port
   257 0000030A E664                    	out	64h, al
   258                                  L19:
   259 0000030C E464                    	in	al, 64h
   260 0000030E A802                    	test	al, 2
   261 00000310 75FA                            jnz     short L19
   262 00000312 B0DF                    	mov	al, 0DFh	; Enable A20 line
   263 00000314 E660                    	out	60h, al
   264                                  ;L20:
   265                                  	;
   266                                  	; Load global descriptor table register
   267                                  
   268                                          ;mov     ax, cs
   269                                          ;mov     ds, ax
   270                                  
   271 00000316 2E0F0116[C05C]                  lgdt    [cs:gdtd]
   272                                  
   273 0000031C 0F20C0                          mov     eax, cr0
   274                                  	; or 	eax, 1
   275 0000031F 40                      	inc     ax
   276 00000320 0F22C0                  	mov     cr0, eax
   277                                  
   278                                  	; Jump to 32 bit code
   279                                  	
   280 00000323 66                      	db 66h 			; Prefix for 32-bit
   281 00000324 EA                      	db 0EAh 		; Opcode for far jump
   282 00000325 [2B030000]              	dd StartPM 		; Offset to start, 32-bit
   283                                  				; (1000h:StartPM = StartPM + 10000h)
   284 00000329 0800                    	dw KCODE		; This is the selector for CODE32_DESCRIPTOR,
   285                                  				; assuming that StartPM resides in code32
   286                                  
   287                                  ; 20/02/2017
   288                                  
   289                                  
   290                                  [BITS 32] 
   291                                  
   292                                  StartPM:
   293                                  	; Kernel Base Address = 0 ; 30/12/2013
   294 0000032B 66B81000                	mov ax, KDATA           ; Save data segment identifier
   295 0000032F 8ED8                            mov ds, ax              ; Move a valid data segment into DS register
   296 00000331 8EC0                           	mov es, ax              ; Move data segment into ES register
   297 00000333 8EE0                           	mov fs, ax              ; Move data segment into FS register
   298 00000335 8EE8                          	mov gs, ax              ; Move data segment into GS register
   299 00000337 8ED0                            mov ss, ax              ; Move data segment into SS register
   300 00000339 BC00000900                      mov esp, 90000h         ; Move the stack pointer to 090000h
   301                                  
   302                                  clear_bss: ; Clear uninitialized data area
   303                                  	; 11/03/2015
   304 0000033E 31C0                    	xor  eax, eax ; 0
   305 00000340 B9F26E0000              	mov  ecx, (bss_end - bss_start)/4
   306                                  	;shr  ecx, 2 ; bss section is already aligned for double words
   307 00000345 BF[D2550100]            	mov  edi, bss_start	
   308 0000034A F3AB                    	rep  stosd  		
   309                                  
   310                                  memory_init:
   311                                  	; Initialize memory allocation table and page tables
   312                                  	; 16/11/2014
   313                                  	; 15/11/2014
   314                                  	; 07/11/2014
   315                                  	; 06/11/2014
   316                                  	; 05/11/2014
   317                                  	; 04/11/2014
   318                                  	; 31/10/2014 (Retro UNIX 386 v1 - Beginning) 
   319                                  	;
   320                                  ;	xor	eax, eax
   321                                  ;	xor 	ecx, ecx
   322 0000034C B108                    	mov	cl, 8
   323 0000034E BF00001000              	mov	edi, MEM_ALLOC_TBL	
   324 00000353 F3AB                    	rep	stosd		   ; clear Memory Allocation Table
   325                                  				   ; for the first 1 MB memory
   326                                  	;
   327 00000355 668B0D[4E5D0000]        	mov	cx, [mem_1m_1k]	   ; Number of contiguous KB between
   328                                  				   ; 1 and 16 MB, max. 3C00h = 15 MB.
   329 0000035C 66C1E902                	shr	cx, 2		   ; convert 1 KB count to 4 KB count
   330 00000360 890D[C8580100]          	mov	[free_pages], ecx
   331 00000366 668B15[505D0000]        	mov	dx, [mem_16m_64k]  ; Number of contiguous 64 KB blocks
   332                                  				   ; between 16 MB and 4 GB.	
   333 0000036D 6609D2                  	or	dx, dx
   334 00000370 7413                    	jz	short mi_0
   335                                  	;
   336 00000372 6689D0                  	mov	ax, dx
   337 00000375 C1E004                  	shl	eax, 4		   ; 64 KB -> 4 KB (page count)
   338 00000378 0105[C8580100]          	add	[free_pages], eax
   339 0000037E 0500100000              	add	eax, 4096	   ; 16 MB = 4096 pages
   340 00000383 EB07                    	jmp	short mi_1
   341                                  mi_0:
   342 00000385 6689C8                  	mov	ax, cx
   343 00000388 66050001                	add	ax, 256		   ; add 256 pages for the first 1 MB		 
   344                                  mi_1:
   345 0000038C A3[C4580100]            	mov	[memory_size], eax ; Total available memory in pages
   346                                  				   ; 1 alloc. tbl. bit = 1 memory page
   347                                  				   ; 32 allocation bits = 32 mem. pages   
   348                                  	;
   349 00000391 05FF7F0000              	add	eax, 32767	   ; 32768 memory pages per 1 M.A.T. page 	
   350 00000396 C1E80F                  	shr	eax, 15		   ; ((32768 * x) + y) pages (y < 32768)
   351                                  				   ;  --> x + 1 M.A.T. pages, if y > 0
   352                                  				   ;  --> x M.A.T. pages, if y = 0
   353 00000399 66A3[D8580100]          	mov	[mat_size], ax	   ; Memory Alloc. Table Size in pages		
   354 0000039F C1E00C                  	shl	eax, 12		   ; 1 M.A.T. page = 4096 bytes
   355                                  	;			   ; Max. 32 M.A.T. pages (4 GB memory)
   356 000003A2 89C3                    	mov	ebx, eax	   ; M.A.T. size in bytes
   357                                  	; Set/Calculate Kernel's Page Directory Address
   358 000003A4 81C300001000            	add	ebx, MEM_ALLOC_TBL
   359 000003AA 891D[C0580100]          	mov	[k_page_dir], ebx  ; Kernel's Page Directory address
   360                                  				   ; just after the last M.A.T. page
   361                                  	;
   362 000003B0 83E804                  	sub	eax, 4		   ; convert M.A.T. size to offset value
   363 000003B3 A3[D0580100]            	mov	[last_page], eax   ; last page ofset in the M.A.T.
   364                                  	;			   ; (allocation status search must be 
   365                                  				   ; stopped after here)	
   366 000003B8 31C0                    	xor	eax, eax
   367 000003BA 48                      	dec	eax		   ; FFFFFFFFh (set all bits to 1)	
   368 000003BB 6651                    	push	cx
   369 000003BD C1E905                  	shr	ecx, 5		   ; convert 1 - 16 MB page count to 
   370                                  				   ; count of 32 allocation bits
   371 000003C0 F3AB                    	rep	stosd
   372 000003C2 6659                    	pop	cx
   373 000003C4 40                      	inc	eax		   ; 0	
   374 000003C5 80E11F                  	and	cl, 31		   ; remain bits
   375 000003C8 7412                    	jz	short mi_4
   376 000003CA 8907                    	mov	[edi], eax	   ; reset	
   377                                  mi_2:
   378 000003CC 0FAB07                  	bts	[edi], eax	   ; 06/11/2014		
   379 000003CF FEC9                    	dec	cl
   380 000003D1 7404                    	jz	short mi_3
   381 000003D3 FEC0                    	inc	al
   382 000003D5 EBF5                    	jmp	short mi_2
   383                                  mi_3:
   384 000003D7 28C0                    	sub	al, al	   	   ; 0
   385 000003D9 83C704                  	add	edi, 4		   ; 15/11/2014
   386                                  mi_4:
   387 000003DC 6609D2                  	or	dx, dx		  ; check 16M to 4G memory space	
   388 000003DF 7421                    	jz	short mi_6	  ; max. 16 MB memory, no more...
   389                                  	;	
   390 000003E1 B900021000              	mov	ecx, MEM_ALLOC_TBL + 512 ; End of first 16 MB memory
   391                                  	;	
   392 000003E6 29F9                    	sub	ecx, edi	  ; displacement (to end of 16 MB)
   393 000003E8 7406                    	jz	short mi_5	  ; jump if EDI points to 
   394                                  				  ;         end of first 16 MB	
   395 000003EA D1E9                    	shr	ecx, 1		  ; convert to dword count
   396 000003EC D1E9                    	shr	ecx, 1		  ; (shift 2 bits right) 
   397 000003EE F3AB                    	rep 	stosd		  ; reset all bits for reserved pages
   398                                  				  ; (memory hole under 16 MB)
   399                                  mi_5:
   400 000003F0 6689D1                  	mov	cx, dx		  ; count of 64 KB memory blocks
   401 000003F3 D1E9                    	shr	ecx, 1		  ; 1 alloc. dword per 128 KB memory
   402 000003F5 9C                      	pushf			  ; 16/11/2014		
   403 000003F6 48                      	dec	eax		  ; FFFFFFFFh (set all bits to 1)
   404 000003F7 F3AB                    	rep	stosd
   405 000003F9 40                      	inc	eax		  ; 0
   406 000003FA 9D                      	popf			  ; 16/11/2014
   407 000003FB 7305                    	jnc	short mi_6
   408 000003FD 6648                    	dec	ax		  ; eax = 0000FFFFh
   409 000003FF AB                      	stosd
   410 00000400 6640                    	inc	ax		  ; 0		
   411                                  mi_6:
   412 00000402 39DF                    	cmp	edi, ebx	  ; check if EDI points to 	
   413 00000404 730A                    	jnb	short mi_7	  ; end of memory allocation table
   414                                  	;			  ; (>= MEM_ALLOC_TBL + 4906) 
   415 00000406 89D9                    	mov	ecx, ebx	  ; end of memory allocation table
   416 00000408 29F9                    	sub	ecx, edi	  ; convert displacement/offset
   417 0000040A D1E9                    	shr	ecx, 1		  ; to dword count 	 		
   418 0000040C D1E9                    	shr	ecx, 1		  ; (shift 2 bits right) 
   419 0000040E F3AB                    	rep 	stosd		  ; reset all remain M.A.T. bits
   420                                  mi_7:
   421                                  	; Reset M.A.T. bits in M.A.T. (allocate M.A.T. pages)
   422 00000410 BA00001000              	mov	edx, MEM_ALLOC_TBL
   423                                  	;sub	ebx, edx	  ; Mem. Alloc. Tbl. size in bytes
   424                                  	;shr	ebx, 12		  ; Mem. Alloc. Tbl. size in pages	
   425 00000415 668B0D[D8580100]        	mov	cx, [mat_size]	  ; Mem. Alloc. Tbl. size in pages
   426 0000041C 89D7                    	mov	edi, edx
   427 0000041E C1EF0F                  	shr	edi, 15		  ; convert M.A.T. address to
   428                                  				  ; byte offset in M.A.T.
   429                                  				  ; (1 M.A.T. byte points to 
   430                                  				  ;	      32768 bytes)
   431                                  				  ; Note: MEM_ALLOC_TBL address 
   432                                  				  ; must be aligned on 128 KB 
   433                                  				  ; boundary!
   434 00000421 01D7                    	add	edi, edx	  ; points to M.A.T.'s itself	
   435                                  	; eax = 0
   436 00000423 290D[C8580100]          	sub	[free_pages], ecx ; 07/11/2014
   437                                  mi_8:
   438 00000429 0FB307                  	btr	[edi], eax	  ; clear bit 0 to bit x (1 to 31)
   439                                  	;dec	bl
   440 0000042C FEC9                    	dec	cl
   441 0000042E 7404                    	jz	short mi_9
   442 00000430 FEC0                    	inc	al
   443 00000432 EBF5                    	jmp	short mi_8
   444                                  mi_9:
   445                                  	;
   446                                  	; Reset Kernel's Page Dir. and Page Table bits in M.A.T.
   447                                  	;		(allocate pages for system page tables)
   448                                  
   449                                  	; edx = MEM_ALLOC_TBL
   450 00000434 8B0D[C4580100]          	mov	ecx, [memory_size] ; memory size in pages (PTEs)
   451 0000043A 81C1FF030000            	add	ecx, 1023	 ; round up (1024 PTEs per table)	 	
   452 00000440 C1E90A                  	shr	ecx, 10		 ; convert memory page count to 
   453                                  				 ; page table count (PDE count)
   454                                  	;
   455 00000443 51                      	push	ecx		 ; (**) PDE count (<= 1024)
   456                                  	;
   457 00000444 41                      	inc	ecx		 ; +1 for kernel page directory	
   458                                  	;
   459 00000445 290D[C8580100]          	sub	[free_pages], ecx ; 07/11/2014
   460                                  	;
   461 0000044B 8B35[C0580100]          	mov	esi, [k_page_dir] ; Kernel's Page Directory address
   462 00000451 C1EE0C                  	shr	esi, 12		 ; convert to page number
   463                                  mi_10:
   464 00000454 89F0                    	mov	eax, esi	 ; allocation bit offset		 
   465 00000456 89C3                    	mov	ebx, eax
   466 00000458 C1EB03                  	shr	ebx, 3		 ; convert to alloc. byte offset
   467 0000045B 80E3FC                  	and	bl,  0FCh	 ; clear bit 0 and bit 1
   468                                  				 ;   to align on dword boundary
   469 0000045E 83E01F                  	and	eax, 31		 ; set allocation bit position 
   470                                  				 ;  (bit 0 to bit 31)
   471                                  	;
   472 00000461 01D3                    	add	ebx, edx	 ; offset in M.A.T. + M.A.T. address 
   473                                  	;
   474 00000463 0FB303                  	btr 	[ebx], eax	 ; reset relevant bit (0 to 31)
   475                                  	;
   476 00000466 46                      	inc	esi		 ; next page table
   477 00000467 E2EB                    	loop	mi_10		 ; allocate next kernel page table 
   478                                  				 ; (ecx = page table count + 1)		
   479                                  	;
   480 00000469 59                      	pop	ecx		 ; (**) PDE count (= pg. tbl. count)
   481                                  	;
   482                                  	; Initialize Kernel Page Directory and Kernel Page Tables
   483                                  	;
   484                                  	; Initialize Kernel's Page Directory
   485 0000046A 8B3D[C0580100]          	mov	edi, [k_page_dir]
   486 00000470 89F8                    	mov	eax, edi
   487 00000472 0C03                    	or	al, PDE_A_PRESENT + PDE_A_WRITE
   488                                  		     	      ; supervisor + read&write + present
   489 00000474 89CA                    	mov	edx, ecx 	; (**) PDE count (= pg. tbl. count)	
   490                                  mi_11:
   491 00000476 0500100000              	add	eax, 4096	; Add page size (PGSZ)
   492                                  			        ; EAX points to next page table
   493 0000047B AB                      	stosd
   494 0000047C E2F8                    	loop	mi_11
   495 0000047E 29C0                    	sub	eax, eax	; Empty PDE
   496 00000480 66B90004                	mov	cx, 1024	; Entry count (PGSZ/4)
   497 00000484 29D1                    	sub	ecx, edx
   498 00000486 7402                    	jz	short mi_12
   499 00000488 F3AB                    	rep	stosd 		; clear remain (empty) PDEs
   500                                  	;
   501                                  	; Initialization of Kernel's Page Directory is OK, here.
   502                                  mi_12:
   503                                  	; Initialize Kernel's Page Tables
   504                                  	;
   505                                  	; (EDI points to address of page table 0)
   506                                  	; eax = 0
   507 0000048A 8B0D[C4580100]          	mov	ecx, [memory_size] ; memory size in pages
   508 00000490 89CA                    	mov	edx, ecx	; (***)
   509 00000492 B003                    	mov	al, PTE_A_PRESENT + PTE_A_WRITE
   510                                  			     ; supervisor + read&write + present 	
   511                                  mi_13:
   512 00000494 AB                      	stosd
   513 00000495 0500100000              	add	eax, 4096	
   514 0000049A E2F8                    	loop	mi_13	
   515 0000049C 6681E2FF03              	and	dx, 1023	; (***)
   516 000004A1 740B                    	jz	short mi_14
   517 000004A3 66B90004                	mov	cx, 1024	
   518 000004A7 6629D1                  	sub	cx, dx		; from dx (<= 1023) to 1024
   519 000004AA 31C0                    	xor	eax, eax
   520 000004AC F3AB                    	rep	stosd		; clear remain (empty) PTEs 
   521                                  				; of the last page table
   522                                  mi_14:
   523                                  	;  Initialization of Kernel's Page Tables is OK, here.
   524                                  	;
   525 000004AE 89F8                    	mov	eax, edi	; end of the last page table page
   526                                  			        ; (beginging of user space pages)
   527 000004B0 C1E80F                  	shr	eax, 15		; convert to M.A.T. byte offset
   528 000004B3 24FC                    	and	al, 0FCh	; clear bit 0 and bit 1 for
   529                                  				; aligning on dword boundary	
   530                                  	 
   531 000004B5 A3[D4580100]            	mov	[first_page], eax
   532 000004BA A3[CC580100]            	mov	[next_page], eax ; The first free page pointer
   533                                  				 ; for user programs
   534                                  				 ; (Offset in Mem. Alloc. Tbl.)	
   535                                  	;
   536                                  	; Linear/FLAT (1 to 1) memory paging for the kernel is OK, here.
   537                                  	;
   538                                  	
   539                                  	; Enable paging
   540                                  	;
   541 000004BF A1[C0580100]                    mov     eax, [k_page_dir]
   542 000004C4 0F22D8                  	mov	cr3, eax
   543 000004C7 0F20C0                  	mov	eax, cr0
   544 000004CA 0D00000080              	or	eax, 80000000h	; set paging bit (bit 31)
   545 000004CF 0F22C0                  	mov	cr0, eax
   546                                          ;jmp    KCODE:StartPMP
   547                                  
   548 000004D2 EA                      	db 0EAh 		; Opcode for far jump
   549 000004D3 [D9040000]                      dd StartPMP		; 32 bit offset
   550 000004D7 0800                    	dw KCODE		; kernel code segment descriptor
   551                                  
   552                                  
   553                                  StartPMP:
   554                                  	; 06/11//2014
   555                                  	; Clear video page 0
   556                                  	;
   557                                  	; Temporary Code
   558                                  	;
   559 000004D9 B9E8030000              	mov	ecx, 80*25/2
   560 000004DE BF00800B00              	mov	edi, 0B8000h
   561                                  	; 30/01/2016
   562                                  	;xor	eax, eax	; black background, black fore color
   563 000004E3 B800070007              	mov	eax, 07000700h  ; black background, light gray fore color
   564 000004E8 F3AB                    	rep	stosd
   565                                  	
   566                                  	; 19/08/2014
   567                                  	; Kernel Base Address = 0
   568                                  	; It is mapped to (physically) 0 in the page table.
   569                                  	; So, here is exactly 'StartPMP' address.
   570                                  
   571                                   	; 29/01/2016 (TRDOS 386 = TRDOS v2.0)
   572 000004EA BE[1D1A0100]            	mov	esi, starting_msg
   573                                  	;; 14/08/2015 (kernel version message will appear
   574                                  	;;	       when protected mode and paging is enabled)
   575 000004EF BF00800B00              	mov	edi, 0B8000h ; 27/08/2014
   576 000004F4 B40A                    	mov	ah, 0Ah ; Black background, light green forecolor
   577                                  	; 20/08/2014
   578 000004F6 E88F010000              	call	printk
   579                                  
   580                                  	; 'UNIX v7/x86' source code by Robert Nordier (1999)
   581                                  	; // Set IRQ offsets
   582                                  	;
   583                                  	;  Linux (v0.12) source code by Linus Torvalds (1991)
   584                                  	;
   585                                  					;; ICW1
   586 000004FB B011                    	mov	al, 11h			; Initialization sequence
   587 000004FD E620                    	out	20h, al			; 	8259A-1
   588                                  	; jmp 	$+2
   589 000004FF E6A0                    	out	0A0h, al		; 	8259A-2
   590                                  					;; ICW2
   591 00000501 B020                    	mov	al, 20h			; Start of hardware ints (20h)
   592 00000503 E621                    	out	21h, al			;	for 8259A-1
   593                                  	; jmp 	$+2
   594 00000505 B028                    	mov	al, 28h			; Start of hardware ints (28h)
   595 00000507 E6A1                    	out	0A1h, al		; 	for 8259A-2
   596                                  					;
   597 00000509 B004                    	mov	al, 04h			;; ICW3
   598 0000050B E621                    	out	21h, al			; 	IRQ2 of 8259A-1 (master)
   599                                  	; jmp 	$+2
   600 0000050D B002                    	mov	al, 02h			; 	is 8259A-2 (slave)
   601 0000050F E6A1                    	out	0A1h, al		;
   602                                  					;; ICW4
   603 00000511 B001                    	mov	al, 01h	 		;
   604 00000513 E621                    	out	21h, al			; 	8086 mode, normal EOI	
   605                                  	; jmp 	$+2
   606 00000515 E6A1                    	out	0A1h, al		;	for both chips.
   607                                  
   608                                  	;mov	al, 0FFh	; mask off all interrupts for now
   609                                  	;out	21h, al
   610                                  	;; jmp 	$+2
   611                                  	;out	0A1h, al
   612                                  
   613                                  	; 02/04/2015
   614                                  	; 26/03/2015 System call (INT 30h) modification
   615                                  	;  DPL = 3 (Interrupt service routine can be called from user mode)			
   616                                  	;
   617                                  	;; Linux (v0.12) source code by Linus Torvalds (1991)
   618                                  	;  setup_idt:
   619                                  	;
   620                                          ;; 16/02/2015
   621                                  	;;mov     dword [DISKETTE_INT], fdc_int ; IRQ 6 handler
   622                                  	; 21/08/2014 (timer_int)
   623 00000517 BE[E0160100]            	mov	esi, ilist
   624 0000051C 8D3D[D8550100]          	lea	edi, [idt]
   625                                  	; 26/03/2015
   626 00000522 B930000000              	mov	ecx, 48		; 48 hardware interrupts (INT 0 to INT 2Fh)
   627                                  	; 02/04/2015
   628 00000527 BB00000800              	mov	ebx,  80000h
   629                                  rp_sidt1:
   630 0000052C AD                      	lodsd
   631 0000052D 89C2                    	mov	edx, eax
   632 0000052F 66BA008E                	mov	dx, 8E00h
   633 00000533 6689C3                  	mov	bx, ax
   634 00000536 89D8                    	mov	eax, ebx	; /* selector = 0x0008 = cs */
   635                                         			        ; /* interrupt gate - dpl=0, present */
   636 00000538 AB                      	stosd	; selector & offset bits 0-15 	
   637 00000539 89D0                    	mov	eax, edx
   638 0000053B AB                      	stosd	; attributes & offset bits 16-23
   639 0000053C E2EE                    	loop	rp_sidt1
   640                                  	; 15/04/2016
   641                                  	; TRDOS 386 (TRDOS v2.0) /// 32 sofware interrupts ///
   642                                  	;mov	cl, 16        ; 16 software interrupts (INT 30h to INT 3Fh)
   643 0000053E B120                    	mov	cl, 32	      ; 32 software interrupts (INT 30h to INT 4Fh)	
   644                                  rp_sidt2:
   645 00000540 AD                      	lodsd
   646 00000541 21C0                    	and	eax, eax
   647 00000543 7413                    	jz	short rp_sidt3
   648 00000545 89C2                    	mov	edx, eax
   649 00000547 66BA00EE                	mov	dx, 0EE00h	; P=1b/DPL=11b/01110b
   650 0000054B 6689C3                  	mov	bx, ax
   651 0000054E 89D8                    	mov	eax, ebx	; selector & offset bits 0-15 	
   652 00000550 AB                      	stosd
   653 00000551 89D0                    	mov	eax, edx
   654 00000553 AB                      	stosd
   655 00000554 E2EA                    	loop	rp_sidt2
   656 00000556 EB16                    	jmp	short sidt_OK
   657                                  rp_sidt3:
   658 00000558 B8[B30A0000]            	mov	eax, ignore_int
   659 0000055D 89C2                    	mov	edx, eax
   660 0000055F 66BA00EE                	mov	dx, 0EE00h	; P=1b/DPL=11b/01110b
   661 00000563 6689C3                  	mov	bx, ax
   662 00000566 89D8                    	mov	eax, ebx	; selector & offset bits 0-15 	
   663                                  rp_sidt4:
   664 00000568 AB                      	stosd
   665 00000569 92                      	xchg	eax, edx
   666 0000056A AB                      	stosd
   667 0000056B 92                      	xchg	edx, eax
   668 0000056C E2FA                    	loop	rp_sidt4
   669                                  sidt_OK: 
   670 0000056E 0F011D[C65C0000]        	lidt 	[idtd]
   671                                  	;
   672                                  	; TSS descriptor setup ; 24/03/2015
   673 00000575 B8[58580100]            	mov	eax, task_state_segment
   674 0000057A 66A3[BA5C0000]          	mov	[gdt_tss0], ax
   675 00000580 C1C010                  	rol	eax, 16
   676 00000583 A2[BC5C0000]            	mov	[gdt_tss1], al
   677 00000588 8825[BF5C0000]          	mov	[gdt_tss2], ah
   678 0000058E 66C705[BE580100]68-     	mov	word [tss.IOPB], tss_end - task_state_segment
   678 00000596 00                 
   679                                  		; 
   680                                  		; IO Map Base address (When this address points
   681                                  		; to end of the TSS, CPU does not use IO port 
   682                                  		; permission bit map for RING 3 IO permissions, 
   683                                  		; access to any IO ports in ring 3 will be forbidden.)
   684                                   		;
   685                                  	;mov	[tss.esp0], esp ; TSS offset 4
   686                                  	;mov	word [tss.ss0], KDATA ; TSS offset 8 (SS)
   687 00000597 66B82800                   	mov	ax, TSS  ; It is needed when an interrupt 
   688                                  			 ; occurs (or a system call -software INT- is requested)
   689                                  			 ; while cpu running in ring 3 (in user mode).				
   690                                  			 ; (Kernel stack pointer and segment will be loaded
   691                                  			 ; from offset 4 and 8 of the TSS, by the CPU.)	 
   692 0000059B 0F00D8                  	ltr	ax  ; Load task register
   693                                  	;
   694                                  esp0_set0:
   695                                  	; 30/07/2015
   696 0000059E 8B0D[C4580100]          	mov 	ecx, [memory_size] ; memory size in pages
   697 000005A4 C1E10C                  	shl 	ecx, 12 ; convert page count to byte count
   698 000005A7 81F900004000            	cmp	ecx, CORE ; beginning of user's memory space (400000h)
   699                                  			  ; (kernel mode virtual address)
   700 000005AD 7605                    	jna	short esp0_set1
   701                                  	;
   702                                  	; If available memory > CORE (end of the 1st 4 MB)
   703                                  	; set stack pointer to CORE
   704                                  	;(Because, PDE 0 is reserved for kernel space in user's page directory)
   705                                  	;(PDE 0 points to page table of the 1st 4 MB virtual address space)
   706 000005AF B900004000              	mov	ecx, CORE
   707                                  esp0_set1:
   708 000005B4 89CC                    	mov	esp, ecx ; top of kernel stack (**tss.esp0**)
   709                                  esp0_set_ok:
   710                                  	; 30/07/2015 (**tss.esp0**) 
   711 000005B6 8925[5C580100]          	mov	[tss.esp0], esp
   712 000005BC 66C705[60580100]10-             mov     word [tss.ss0], KDATA
   712 000005C4 00                 
   713                                  	; 14/08/2015
   714                                  	; 10/11/2014 (Retro UNIX 386 v1 - Erdogan Tan)
   715                                  	;
   716                                  	;cli	; Disable interrupts (for CPU)
   717                                  	;    (CPU will not handle hardware interrupts, except NMI!)
   718                                  	;
   719 000005C5 30C0                    	xor	al, al		; Enable all hardware interrupts!
   720 000005C7 E621                    	out	21h, al		; (IBM PC-AT compatibility)
   721 000005C9 EB00                    	jmp 	$+2		; (All conventional PC-AT hardware
   722 000005CB E6A1                    	out	0A1h, al	;  interrupts will be in use.)	
   723                                  				; (Even if related hardware component
   724                                  				;  does not exist!)
   725                                  	; Enable NMI 
   726 000005CD B07F                    	mov	al, 7Fh		; Clear bit 7 to enable NMI (again)
   727 000005CF E670                    	out  	70h, al
   728                                  	; 23/02/2015
   729 000005D1 90                      	nop
   730 000005D2 E471                    	in	al, 71h		; read in 71h just after writing out to 70h
   731                                  				; for preventing unknown state (!?)
   732                                  	;
   733                                  	; Only a NMI can occur here... (Before a 'STI' instruction)
   734                                  	;
   735                                  	; 02/09/2014
   736 000005D4 6631DB                  	xor	bx, bx
   737 000005D7 66BA0002                	mov	dx, 0200h	; Row 2, column 0  ; 07/03/2015
   738 000005DB E871170000              	call	_set_cpos	; 24/01/2016
   739                                  	;
   740                                  	; 06/11/2014
   741 000005E0 E8782C0000              	call	memory_info
   742                                  	; 14/08/2015
   743                                  	;call getch ; 28/02/2015
   744                                  drv_init:
   745 000005E5 FB                      	sti	; Enable Interrupts 
   746                                  	; 06/02/2015
   747 000005E6 8B15[585D0000]          	mov	edx, [hd0_type] ; hd0, hd1, hd2, hd3
   748 000005EC 668B1D[565D0000]        	mov	bx, [fd0_type] ; fd0, fd1
   749                                  	; 22/02/2015
   750 000005F3 6621DB                  	and	bx, bx
   751 000005F6 751C                    	jnz	short di1
   752                                  	;
   753 000005F8 09D2                    	or 	edx, edx
   754 000005FA 752A                    	jnz	short di2
   755                                  	;
   756                                  setup_error:
   757 000005FC BE[E6190100]            	mov 	esi, setup_error_msg
   758                                  psem:	
   759 00000601 AC                      	lodsb
   760 00000602 08C0                    	or	al, al
   761                                  	;jz	short haltx ; 22/02/2015
   762 00000604 7427                    	jz	short di3
   763 00000606 56                      	push	esi
   764                                  	; 13/05/2016
   765 00000607 BB07000000              	mov	ebx, 7	; Black background, 
   766                                  			; light gray forecolor
   767                                  			; Video page 0 (BH=0)
   768 0000060C E8AA160000              	call	_write_tty
   769 00000611 5E                      	pop	esi
   770 00000612 EBED                    	jmp	short psem
   771                                  
   772                                  di1:
   773                                  	; supress 'jmp short T6'
   774                                  	;  (activate fdc motor control code)
   775 00000614 66C705[F4060000]90-     	mov	word [T5], 9090h ; nop
   775 0000061C 90                 
   776                                  	;
   777                                  	;mov	ax, int_0Eh	; IRQ 6 handler
   778                                  	;mov	di, 0Eh*4	; IRQ 6 vector
   779                                  	;stosw
   780                                  	;mov 	ax, cs
   781                                  	;stosw
   782                                  	;; 16/02/2015
   783                                          ;;mov     dword [DISKETTE_INT], fdc_int ; IRQ 6 handler
   784                                  	;
   785 0000061D E8CD3B0000              	CALL	DSKETTE_SETUP	; Initialize Floppy Disks
   786                                  	;
   787 00000622 09D2                    	or	edx, edx
   788 00000624 7407                            jz      short di3
   789                                  di2:
   790 00000626 E80B3C0000              	call   	DISK_SETUP	; Initialize Fixed Disks
   791 0000062B 72CF                            jc      short setup_error
   792                                  di3:
   793 0000062D E8FF2B0000              	call	setup_rtc_int	; 22/05/2015 (dsectrpm.s)
   794                                  	;
   795 00000632 E845120100              	call	display_disks ; 07/03/2015  (Temporary)
   796                                  ;haltx:
   797                                  	; 14/08/2015
   798                                  	;call	getch ; 22/02/2015
   799                                  	;sti	; Enable interrupts (for CPU)
   800                                  ;	; 29/01/2016
   801                                  ;	sub	ah, ah ;  read time count
   802                                  ;	call	int1Ah
   803                                  ;	mov	edx, ecx ; 18.2 * seconds
   804                                  ;md_info_msg_wait1:
   805                                  ;	; 29/01/2016
   806                                  ;	mov	ah, 1
   807                                  ;	call	int16h
   808                                  ;	jz	short md_info_msg_wait2
   809                                  ;	xor	ah, ah ; 0
   810                                  ;       call    int16h
   811                                  ;	jmp 	short md_info_msg_ok
   812                                  ;md_info_msg_wait2:
   813                                  ;	sub	ah, ah  ; read time count
   814                                  ;	call	int1Ah
   815                                  ;	cmp	edx, ecx ; ; 18.2 * seconds
   816                                  ;	jna	short md_info_msg_wait3
   817                                  ;	xchg 	edx, ecx	
   818                                  ;md_info_msg_wait3:
   819                                  ;	sub	ecx, edx
   820                                  ;	cmp	ecx, 127 ; 7 seconds (18.2 * 7)
   821                                  ;	jb	short md_info_msg_wait1		
   822                                  ;md_info_msg_ok:
   823                                  	; 08/09/2016
   824 00000637 0F20C0                  	mov	eax, cr0
   825 0000063A A810                    	test	al, 10h  ; Bit 4, ET (Extension Type)
   826 0000063C 7408                    	jz	short sysinit
   827                                  	; 27/02/2017
   828 0000063E FE05[7C650100]          	inc	byte [fpready]
   829                                  	; 80387 (FPU) is ready
   830 00000644 DBE3                    	fninit ; Initialize Floating-Point Unit
   831                                  sysinit:
   832                                  	; 30/06/2015
   833 00000646 E8635C0000              	call	sys_init
   834                                  	;
   835                                  	;jmp 	cpu_reset ; 22/02/2015
   836                                  hang:  
   837                                  	; 23/02/2015
   838                                  	;sti			; Enable interrupts
   839 0000064B F4                      	hlt
   840                                  	;
   841                                  	;nop
   842                                  	;; 03/12/2014
   843                                  	;; 28/08/2014
   844                                  	;mov	ah, 11h
   845                                  	;call	getc
   846                                  	;jz      _c8
   847                                  	;
   848                                  	; 23/02/2015
   849                                  	; 06/02/2015
   850                                  	; 07/09/2014
   851 0000064C 31DB                    	xor	ebx, ebx
   852 0000064E 8A1D[EE580100]          	mov	bl, [ptty]	; active_page
   853 00000654 89DE                    	mov	esi, ebx
   854 00000656 66D1E6                  	shl 	si, 1
   855 00000659 81C6[F0580100]          	add	esi, ttychr
   856 0000065F 668B06                  	mov	ax, [esi]
   857 00000662 6621C0                  	and	ax, ax
   858                                  	;jz	short _c8
   859 00000665 74E4                    	jz	short hang
   860 00000667 66C7060000              	mov	word [esi], 0
   861 0000066C 80FB03                  	cmp	bl, 3		; Video page 3
   862                                  	;jb	short _c8
   863 0000066F 72DA                    	jb	short hang
   864                                  	;	
   865                                  	; 13/05/2016
   866                                  	; 07/09/2014
   867                                  nxtl:
   868 00000671 6653                    	push	bx
   869 00000673 66BB0E00                	mov	bx, 0Eh 	; Yellow character 
   870                                  				; on black background
   871                                  				; bh = 0 (video page 0)
   872                                  				; Retro UNIX 386 v1 - Video Mode 0
   873                                  				; (PC/AT Video Mode 3 - 80x25 Alpha.)
   874 00000677 6650                    	push	ax
   875 00000679 E83D160000              	call 	_write_tty
   876 0000067E 6658                    	pop	ax
   877 00000680 665B                    	pop	bx
   878 00000682 3C0D                    	cmp	al, 0Dh		; carriage return (enter)
   879                                  	;jne	short _c8
   880 00000684 75C5                    	jne	short hang
   881 00000686 B00A                    	mov	al, 0Ah		; next line
   882 00000688 EBE7                    	jmp	short nxtl
   883                                  	
   884                                  ;_c8:
   885                                  ;	; 25/08/2014
   886                                  ;	cli				; Disable interrupts
   887                                  ;	mov	al, [scounter + 1]
   888                                  ;	and	al, al
   889                                  ;	jnz	hang
   890                                  ;	call	rtc_p
   891                                  ;	jmp     hang
   892                                  
   893                                  
   894                                  	; 27/08/2014
   895                                  	; 20/08/2014
   896                                  printk:
   897                                          ;mov    edi, [scr_row]
   898                                  pkl:
   899 0000068A AC                      	lodsb
   900 0000068B 08C0                    	or 	al, al
   901 0000068D 7404                    	jz	short pkr
   902 0000068F 66AB                    	stosw
   903 00000691 EBF7                    	jmp	short pkl
   904                                  pkr:
   905 00000693 C3                      	retn
   906                                  
   907                                  ; 28/02/2017
   908                                  ; 22/01/2017
   909                                  ; 15/01/2017
   910                                  ; 14/01/2017
   911                                  ; 02/01/2017
   912                                  ; 25/12/2016
   913                                  ; 19/12/2016
   914                                  ; 10/12/2016 (callback)
   915                                  ; 06/06/2016
   916                                  ; 23/05/2016
   917                                  ; 22/05/2016 - TRDOS 386 (TRDOS v2.0) Timer Event Modifications
   918                                  ; 25/07/2015
   919                                  ; 14/05/2015 (multi tasking -time sharing- 'clock', x_timer)
   920                                  ; 17/02/2015
   921                                  ; 06/02/2015 (unix386.s)
   922                                  ; 11/12/2014 - 22/12/2014 (dsectrm2.s) 
   923                                  ;
   924                                  ; IBM PC-XT Model 286 Source Code - BIOS2.ASM (06/10/85)
   925                                  ;
   926                                  ;-- HARDWARE INT  08 H - ( IRQ LEVEL 0 ) ---------------------------------------
   927                                  ;	THIS ROUTINE HANDLES THE TIMER INTERRUPT FROM FROM CHANNEL 0 OF        :
   928                                  ;	THE 8254 TIMER.  INPUT FREQUENCY IS 1.19318 MHZ AND THE DIVISOR        :
   929                                  ;	IS 65536, RESULTING IN APPROXIMATELY 18.2 INTERRUPTS EVERY SECOND.     :
   930                                  ;									       :
   931                                  ;	THE INTERRUPT HANDLER MAINTAINS A COUNT (40:6C) OF INTERRUPTS SINCE    :
   932                                  ;	POWER ON TIME, WHICH MAY BE USED TO ESTABLISH TIME OF DAY.	       :
   933                                  ;	THE INTERRUPT HANDLER ALSO DECREMENTS THE MOTOR CONTROL COUNT (40:40)  :
   934                                  ;	OF THE DISKETTE, AND WHEN IT EXPIRES, WILL TURN OFF THE 	       :
   935                                  ;	DISKETTE MOTOR(s), AND RESET THE MOTOR RUNNING FLAGS.		       :
   936                                  ;	THE INTERRUPT HANDLER WILL ALSO INVOKE A USER ROUTINE THROUGH	       :
   937                                  ;	INTERRUPT 1CH AT EVERY TIME TICK.  THE USER MUST CODE A 	       :
   938                                  ;	ROUTINE AND PLACE THE CORRECT ADDRESS IN THE VECTOR TABLE.	       :
   939                                  ;-------------------------------------------------------------------------------
   940                                  ;
   941                                  
   942                                  timer_int:	; IRQ 0
   943                                  ;int_08h:	; Timer
   944                                  	; 14/10/2015
   945                                  	; Here, we are simulating system call entry (for task switch)
   946                                  	; (If multitasking is enabled, 
   947                                  	; 'clock' procedure may jump to 'sysrelease')
   948                                  
   949 00000694 1E                      	push	ds
   950 00000695 06                      	push	es
   951 00000696 0FA0                    	push	fs
   952 00000698 0FA8                    	push	gs
   953                                  
   954 0000069A 60                      	pushad	; eax, ecx, edx, ebx, esp -before pushad-, ebp, esi, edi
   955 0000069B 66B91000                	mov     cx, KDATA
   956 0000069F 8ED9                            mov     ds, cx
   957 000006A1 8EC1                            mov     es, cx
   958 000006A3 8EE1                            mov     fs, cx
   959 000006A5 8EE9                            mov     gs, cx
   960                                  
   961 000006A7 0F20D9                  	mov	ecx, cr3
   962 000006AA 890D[5C040300]          	mov	[cr3reg], ecx ; save current cr3 register value/content
   963                                  
   964                                  	; 14/01/2017
   965 000006B0 3B0D[C0580100]          	cmp 	ecx, [k_page_dir]
   966 000006B6 7409                    	je	short T3
   967                                  
   968 000006B8 8B0D[C0580100]          	mov	ecx, [k_page_dir]
   969 000006BE 0F22D9                  	mov	cr3, ecx
   970                                  T3:
   971                                  	;sti				; INTERRUPTS BACK ON
   972 000006C1 66FF05[40590100]        	INC	word [TIMER_LOW]	; INCREMENT TIME
   973 000006C8 7507                    	JNZ	short T4		; GO TO TEST_DAY
   974 000006CA 66FF05[42590100]        	INC	word [TIMER_HIGH]	; INCREMENT HIGH WORD OF TIME
   975                                  T4:					; TEST_DAY
   976 000006D1 66833D[42590100]18      	CMP	word [TIMER_HIGH],018H	; TEST FOR COUNT EQUALING 24 HOURS
   977 000006D9 7519                    	JNZ	short T5		; GO TO DISKETTE_CTL
   978 000006DB 66813D[40590100]B0-     	CMP	word [TIMER_LOW],0B0H
   978 000006E3 00                 
   979 000006E4 750E                    	JNZ	short T5		; GO TO DISKETTE_CTL
   980                                  
   981                                  ;-----	TIMER HAS GONE 24 HOURS
   982                                  	;;SUB	AX,AX
   983                                  	;MOV	[TIMER_HIGH],AX
   984                                  	;MOV	[TIMER_LOW],AX
   985 000006E6 29C0                    	sub	eax, eax
   986 000006E8 A3[40590100]            	mov	[TIMER_LH], eax
   987                                  	;	
   988 000006ED C605[44590100]01        	MOV	byte [TIMER_OFL],1
   989                                  
   990                                  ;-----	TEST FOR DISKETTE TIME OUT
   991                                  
   992                                  T5:
   993                                  	; 23/12/2014
   994 000006F4 EB1D                    	jmp	short T6		; will be replaced with nop, nop
   995                                  					; (9090h) if a floppy disk
   996                                  					; is detected.
   997                                  	;mov	al,[CS:MOTOR_COUNT]
   998 000006F6 A0[47590100]            	mov	al, [MOTOR_COUNT]
   999 000006FB FEC8                    	dec	al
  1000                                  	;mov	[CS:MOTOR_COUNT], al	; DECREMENT DISKETTE MOTOR CONTROL
  1001 000006FD A2[47590100]            	mov	[MOTOR_COUNT], al
  1002                                  	;mov	[ORG_MOTOR_COUNT], al
  1003 00000702 750F                    	JNZ	short T6		; RETURN IF COUNT NOT OUT
  1004 00000704 B0F0                    	mov 	al,0F0h
  1005                                  	;AND	[CS:MOTOR_STATUS],al 	; TURN OFF MOTOR RUNNING BITS
  1006 00000706 2005[46590100]          	and	[MOTOR_STATUS], al
  1007                                  	;and	[ORG_MOTOR_STATUS], al
  1008 0000070C B00C                    	MOV	AL,0CH			; bit 3 = enable IRQ & DMA, 
  1009                                  					; bit 2 = enable controller
  1010                                  					;	1 = normal operation
  1011                                  					;	0 = reset	
  1012                                  					; bit 0, 1 = drive select
  1013                                  					; bit 4-7 = motor running bits 
  1014 0000070E 66BAF203                	MOV	DX,03F2H		; FDC CTL PORT
  1015 00000712 EE                      	OUT	DX,AL			; TURN OFF THE MOTOR
  1016                                  T6:	
  1017                                  	;inc	word [CS:wait_count]	; 22/12/2014 (byte -> word)
  1018                                  					; TIMER TICK INTERRUPT
  1019                                  	;;inc	word [wait_count] ;;27/02/2015
  1020                                  	;INT	1CH			; TRANSFER CONTROL TO A USER ROUTINE
  1021                                  	;cli
  1022 00000713 E857040000              	call 	u_timer			; TRANSFER CONTROL TO A USER ROUTINE
  1023                                  	; 23/05/2016
  1024 00000718 E89EF20000              	call	clock			; Multi Tasking control procedure
  1025                                  T7:
  1026                                  	; 14/10/2015
  1027 0000071D B020                    	MOV	AL,EOI			; GET END OF INTERRUPT MASK
  1028 0000071F FA                      	CLI				; DISABLE INTERRUPTS TILL STACK CLEARED
  1029 00000720 E620                    	OUT	INTA00,AL		; END OF INTERRUPT TO 8259 - 1	
  1030                                  	;
  1031                                  rtc_int_2:
  1032                                  	; 26/12/2016
  1033                                  	;mov	ecx, [cr3reg]
  1034                                  	; 13/01/2017
  1035 00000722 803D[D4030300]00        	cmp	byte [u.t_lock], 0  	; T_LOCK
  1036 00000729 7730                    	ja	short timer_int_return  ; Timer Lock : 'sysrele' is needed !
  1037                                  	; 28/02/2017
  1038                                  	; We need to exit if the user's IRQ callback service is in progress!
  1039                                  	; (To prevent a conflict!)
  1040 0000072B 803D[D8030300]00        	cmp	byte [u.r_lock], 0	; R_LOCK, IRQ callback service lock !
  1041 00000732 7727                    	ja	short timer_int_return  ; Timer Lock : 'sysrele' is needed !	
  1042                                  	; 15/01/2017
  1043 00000734 803D[50650100]02        	cmp	byte [priority], 2
  1044 0000073B 733A                    	jnb	short T8  ; current process has a timer event (15/01/2017)
  1045                                  	; 22/05/2016
  1046 0000073D 803D[51650100]00        	cmp	byte [p_change], 0 ; in 'set_run_sequence', in 'rtc_p'
  1047 00000744 7615                    	jna	short timer_int_return ; 23/05/2016
  1048                                  
  1049                                  	; 15/01/2017
  1050                                  	
  1051                                  	; present process must be changed with high priority process	
  1052                                  	;xor	al, al
  1053 00000746 31C0                    	xor	eax, eax ; 26/12/2016
  1054 00000748 A2[51650100]            	mov	[p_change], al ; 0
  1055                                  	;mov	byte [priority], 2 ; 15/01/2017 (there is a timer event)
  1056                                  
  1057 0000074D 803D[5B030300]FF        	cmp     byte [sysflg], 0FFh ; user or system space ?
  1058 00000754 7416                    	je	short rtc_int_3     ; user space ([sysflg]= 0FFh)
  1059                                  
  1060                                  	; system space, wait for 'sysret'
  1061                                  	; to change running process 	
  1062                                  	; with high priority (event) process
  1063                                  
  1064 00000756 A2[A8030300]            	mov	[u.quant], al ; 0
  1065                                  
  1066                                  timer_int_return: ; 23/05/2016 - jump from 'rtc_int' ('rtc_int_2')
  1067 0000075B 8B0D[5C040300]          	mov 	ecx, [cr3reg] 	; previous value/content of cr3 register
  1068 00000761 0F22D9                   	mov	cr3, ecx	; restore cr3 register content
  1069                                  	;
  1070 00000764 61                      	popad ; edi, esi, ebp, temp (icrement esp by 4), ebx, edx, ecx, eax
  1071                                  	;
  1072 00000765 0FA9                    	pop	gs
  1073 00000767 0FA1                    	pop	fs
  1074 00000769 07                      	pop	es
  1075 0000076A 1F                      	pop	ds
  1076                                  	;
  1077 0000076B CF                      	iretd	; return from interrupt
  1078                                  
  1079                                  rtc_int_3:
  1080 0000076C FE05[5B030300]          	inc	byte [sysflg] 	; now, we are in system space
  1081                                  	;
  1082 00000772 E90BC00000                      jmp     sysrelease ; change running process immediatelly 
  1083                                  
  1084                                  T8:
  1085                                  	; 13/01/2017 (eax -> ebx)
  1086                                  	; callback checking... (19/12/2016)
  1087 00000777 31DB                    	xor	ebx, ebx
  1088 00000779 871D[D0030300]          	xchg	ebx, [u.tcb] ; callback address (0 = normal return)
  1089 0000077F 09DB                    	or	ebx, ebx
  1090 00000781 74D8                    	jz	short timer_int_return
  1091                                  
  1092                                  	; Set user's callback routine as return address from this interrupt
  1093                                  	; and set normal return address as return address from callback
  1094                                  	; routine!!! (19/12/2016)
  1095                                  	
  1096                                  	; 14/01/2017
  1097                                  	; 13/01/2017 - Timer Lock (T_LOCK)
  1098 00000783 FE05[D4030300]          	inc	byte [u.t_lock]
  1099 00000789 8A0D[5B030300]          	mov	cl, [sysflg]
  1100 0000078F 880D[D5030300]          	mov	[u.t_mode], cl 
  1101                                  
  1102 00000795 8B2D[5C580100]          	mov	ebp, [tss.esp0] ; kernel stack address (for ring 0)
  1103 0000079B 83ED14                  	sub	ebp, 20		; eip, cs, eflags, esp, ss
  1104 0000079E 892D[5C030300]           	mov	[u.sp], ebp
  1105 000007A4 8925[60030300]          	mov	[u.usp], esp
  1106                                  
  1107                                  	;or	word [ebp+8], 200h ; 22/01/2017, force enabling interrupts
  1108                                  
  1109 000007AA 8B44241C                	mov	eax, [esp+28] ; pushed eax
  1110 000007AE A3[64030300]            	mov	[u.r0], eax
  1111                                  
  1112 000007B3 E8F9DE0000              	call	wswap ; save user's registers & status
  1113                                  
  1114                                  	; software int is in ring 0 but timer int must return to ring 3
  1115                                  	; so, ring 3 return address and stack registers
  1116                                  	; (eip, cs, eflags, esp, ss) 
  1117                                  	; must be copied to timer int return
  1118                                  	; eip will be replaced by callback service routine address
  1119                                  
  1120 000007B8 C605[5B030300]FF        	mov	byte [sysflg], 0FFh ; user mode
  1121                                  
  1122                                  	; system mode (system call)
  1123                                  	;mov	ebp, [u.sp] ; EIP (u), CS (UCODE), EFLAGS (u),
  1124                                  			    ; ESP (u), SS (UDATA)
  1125                                  
  1126 000007BF 8B4510                  	mov	eax, [ebp+16]	; SS (UDATA
  1127 000007C2 89E6                    	mov	esi, esp
  1128 000007C4 50                      	push	eax
  1129 000007C5 50                      	push	eax
  1130 000007C6 89E7                    	mov	edi, esp
  1131 000007C8 893D[60030300]          	mov	[u.usp], edi
  1132 000007CE B908000000              	mov	ecx, ((ESPACE/4) - 4) ; except DS, ES, FS, GS
  1133 000007D3 F3A5                    	rep	movsd
  1134 000007D5 B104                    	mov	cl, 4	
  1135 000007D7 F3AB                    	rep	stosd
  1136 000007D9 893D[5C030300]          	mov	[u.sp], edi
  1137 000007DF 89EE                    	mov	esi, ebp
  1138 000007E1 B105                    	mov	cl, 5 ; EIP (u), CS (UCODE), EFLAGS (u), ESP (u), SS (UDATA)
  1139 000007E3 F3A5                    	rep	movsd
  1140                                  
  1141 000007E5 8B0D[B8030300]          	mov	ecx, [u.pgdir]
  1142 000007EB 890D[5C040300]          	mov	[cr3reg], ecx
  1143                                  
  1144                                  	; 13/01/207 (eax -> ebx)
  1145                                  	; EBX = callback routine address (virtual, not physical address!)
  1146                                  
  1147                                  	; 09/01/2017
  1148                                  	; !!! CALLBACK ROUTINE MUST BE ENDED/RETURNED WITH 'sysrele'
  1149                                  	;     system call !!!	
  1150                                  	; 25/12/2016
  1151                                  	; Callback Note: (19/12/2016)
  1152                                  	; !!! CALLBACK ROUTINE MUST BE ENDED/RETURNED WITH 'RETN' !!!
  1153                                  	;	pushf ; save flags	
  1154                                  	; 	<callback service code>
  1155                                  	; 	popf  ; restore flags
  1156                                  	; 	retn ; return to normal running address
  1157                                  	;
  1158                                  
  1159                                  	; 15/01/2017
  1160                                  	; 14/01/2017
  1161                                  	; 13/01/2017 (eax -> ebx)
  1162                                  	; 10/01/2017
  1163                                  set_callback_addr:
  1164                                  	; 09/01/2017 (**)
  1165                                  	; 02/01/2017 (*)
  1166                                  	; 25/12/2016 (*)
  1167                                  	; 19/12/2016 (TRDOS 386 feature only!)
  1168                                  	;
  1169                                  	; This routine sets return address
  1170                                  	; to start of user's interrupt
  1171                                  	; service (callback) address
  1172                                  	;; and sets callback 'retn' address to normal
  1173                                  	;; return address of user's running code! 
  1174                                  	;
  1175                                  	; INPUT:
  1176                                  	;	EBX = callback routine/service address
  1177                                  	;	      (virtual, not physical address!)	
  1178                                  	;	[u.sp] = kernel stack, points to
  1179                                  	;		 user's EIP,CS,EFLAGS,ESP,SS
  1180                                  	;		 registers.
  1181                                  	; OUTPUT:
  1182                                  	;	EIP (user) = callback (service) address
  1183                                  	;	CS (user) = UCODE
  1184                                  	;	EFLAGS (user) = flags before callback 	 
  1185                                  	;       ESP (user) = ESP-4 (user, before callback) 
  1186                                  	;	[ESP](user) = EIP (user) before callback
  1187                                  	;
  1188                                  	; Note: If CPU was in user mode while entering 
  1189                                  	;	the timer interrupt service routine,
  1190                                  	;	'IRET' will get return to callback routine
  1191                                  	;	immediately. If CPU was in system/kernel mode  
  1192                                  	;	'iret' will get return to system call and
  1193                                  	;	then, callback routine will be return address
  1194                                  	;	from system call. (User's callback/service code
  1195                                  	;	will be able to return to normal return address
  1196                                  	;	via an 'retn' at the end.) 
  1197                                  	;
  1198                                  	; Note(**): User's callback service code must be ended
  1199                                  	;	with a 'sysrele' sytstem call ! (09/01/2017)
  1200                                  	;
  1201                                  	;	For example:
  1202                                  	;
  1203                                  	;	timer_callback:
  1204                                  	;	    ...	 
  1205                                    	;	    inc	dword [time_counter]
  1206                                  	;	    ...
  1207                                  	;	    mov eax, 39 ; 'sysrele'
  1208                                  	;	    int 40h ; TRDOS 386 system call (interrupt)		
  1209                                  	;
  1210                                  	;
  1211                                  	;; Note(*): User's callback service code must preserve cpu 
  1212                                  	;;	flags if it has any instructions which changes
  1213                                  	;;	flags in the service code. (25/12/2016)
  1214                                  	;;
  1215                                  	;;	For example:
  1216                                  	;;
  1217                                  	;;	timer_callback:
  1218                                  	;;	    pushf ; save flags
  1219                                  	;;	    ; this instruction changes zero flag
  1220                                    	;;	    inc	dword [time_counter]
  1221                                  	;;	    popf ; restore flags
  1222                                  	;;	    retn ; return to normal user code
  1223                                  	;;		  (which is interrupted by the 
  1224                                  	;;		   timer interput) 	
  1225                                  	;;
  1226                                  
  1227                                  	; 15/01/2017
  1228 000007F1 8B2D[5C030300]          	mov	ebp, [u.sp]; kernel's stack, points to EIP (user)
  1229 000007F7 895D00                  	mov	[ebp], ebx
  1230 000007FA E95CFFFFFF              	jmp	timer_int_return
  1231                                  
  1232                                  	; 15/01/2017
  1233                                  	; 13/01/2017
  1234                                  	; 19/12/2016
  1235                                  	; 06/06/2016
  1236                                  	; 23/05/2016
  1237                                  	; 22/05/2016
  1238                                  	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  1239                                  	; 26/02/2015
  1240                                  	; 07/09/2014
  1241                                  	; 25/08/2014
  1242                                  rtc_int:       ; Real Time Clock Interrupt (IRQ 8)
  1243                                  	; 22/05/2016
  1244 000007FF 1E                      	push	ds ; ** ; 23/05/2016
  1245 00000800 50                      	push	eax ; *
  1246 00000801 66B81000                	mov	ax, KDATA
  1247 00000805 8ED8                    	mov	ds, ax
  1248                                  	;
  1249 00000807 8A25[3E590100]          	mov	ah, [RTC_2Hz] ;  2 Hz interrupt to 1 Hz function
  1250 0000080D 80F401                  	xor	ah, 1
  1251 00000810 8825[3E590100]          	mov	[RTC_2Hz], ah ; 1 = 0.5 second, 0 = 1 second
  1252 00000816 753B                    	jnz	short rtc_int_return ; half second
  1253                                  	; 1 second
  1254                                  rtc_int_0:
  1255                                  	; 22/05/2016
  1256 00000818 58                      	pop	eax ; *
  1257                                  	;
  1258                                  	; 14/10/2015 ('timer_int')
  1259                                  	; Here, we are simulating system call entry (for task switch)
  1260                                  	; (If multitasking is enabled, 
  1261                                  	; 'clock' procedure may jump to 'sysrelease')
  1262                                  	;push	ds ; ** ; 23/05/2016
  1263 00000819 06                      	push	es
  1264 0000081A 0FA0                    	push	fs
  1265 0000081C 0FA8                    	push	gs
  1266 0000081E 60                      	pushad  ; eax, ecx, edx, ebx, esp -before pushad-, ebp, esi, edi
  1267 0000081F 66B91000                	mov     cx, KDATA
  1268                                          ;mov    ds, cx ; 06/06/2016
  1269 00000823 8EC1                            mov     es, cx
  1270 00000825 8EE1                            mov     fs, cx
  1271 00000827 8EE9                            mov     gs, cx
  1272                                  	;
  1273 00000829 0F20D9                  	mov	ecx, cr3
  1274 0000082C 890D[5C040300]          	mov	[cr3reg], ecx ; save current cr3 register value/content
  1275                                  	;
  1276 00000832 803D[D4030300]00        	cmp	byte [u.t_lock], 0 ; timer lock (callback) status ?
  1277 00000839 7711                    	ja	short rtc_int_1	   ; yes
  1278                                  
  1279                                  	; 15/01/2017
  1280 0000083B 3B0D[C0580100]          	cmp 	ecx, [k_page_dir]
  1281 00000841 7409                    	je	short rtc_int_1
  1282                                  
  1283 00000843 8B0D[C0580100]          	mov	ecx, [k_page_dir]
  1284 00000849 0F22D9                  	mov	cr3, ecx
  1285                                  rtc_int_1:
  1286                                  	; Timer event (kernel) functions must be performed with
  1287                                  	; 1 second intervals - TRDOS 386 (TRDOS v2.0) feature ! -
  1288                                   	;	
  1289                                  	; 25/08/2014
  1290 0000084C E81A030000              	call	rtc_p  ; 19/05/2016 - major modification 
  1291                                  	
  1292                                  	; 23/05/2016
  1293 00000851 28E4                    	sub	ah, ah ; 0
  1294                                  	; 22/05/2016 - TRDOS 386 timer event modifications
  1295                                  rtc_int_return: ; 19/05/2016
  1296                                  	; 22/02/2015 - dsectpm.s
  1297                                  	; [ source: http://wiki.osdev.org/RTC ]
  1298                                  	; read status register C to complete procedure
  1299                                  	;(it is needed to get a next IRQ 8) 
  1300 00000853 B00C                    	mov	al, 0Ch ; 
  1301 00000855 E670                    	out	70h, al ; select register C
  1302 00000857 90                      	nop
  1303 00000858 E471                    	in	al, 71h ; just throw away contents
  1304                                  	; 22/02/2015
  1305 0000085A B020                    	MOV	AL,EOI		; END OF INTERRUPT
  1306                                  	;CLI			; DISABLE INTERRUPTS TILL STACK CLEARED
  1307 0000085C E6A0                    	OUT	INTB00,AL	; FOR CONTROLLER #2
  1308                                  
  1309                                  	; 23/05/2016
  1310 0000085E B020                    	MOV	AL,EOI		; GET END OF INTERRUPT MASK
  1311 00000860 FA                      	CLI			; DISABLE INTERRUPTS TILL STACK CLEARED
  1312 00000861 E620                    	OUT	INTA00,AL	; END OF INTERRUPT TO 8259 - 1	
  1313                                  	;
  1314                                  	; 23/05/2016
  1315 00000863 20E4                    	and	ah, ah
  1316 00000865 0F84B7FEFFFF                    jz      rtc_int_2
  1317                                  	
  1318                                  	; ah = 1 (half second)
  1319 0000086B 58                      	pop	eax ; *
  1320 0000086C 1F                      	pop	ds  ; **
  1321 0000086D CF                      	iretd
  1322                                  
  1323                                  ; ////////////////
  1324                                  
  1325                                  	; 28/08/2014
  1326                                  irq0:
  1327 0000086E 6A00                            push 	dword 0
  1328 00000870 EB48                    	jmp	short which_irq
  1329                                  irq1:
  1330 00000872 6A01                            push 	dword 1
  1331 00000874 EB44                    	jmp	short which_irq
  1332                                  irq2:
  1333 00000876 6A02                            push 	dword 2
  1334 00000878 EB40                    	jmp	short which_irq
  1335                                  irq3:
  1336                                  	; 20/11/2015
  1337                                  	; 24/10/2015
  1338 0000087A 2EFF15[79FC0000]        	call	dword [cs:com2_irq3]
  1339 00000881 6A03                    	push 	dword 3
  1340 00000883 EB35                    	jmp	short which_irq
  1341                                  irq4:
  1342                                  	; 20/11/2015
  1343                                  	; 24/10/2015
  1344 00000885 2EFF15[75FC0000]        	call	dword [cs:com1_irq4]
  1345 0000088C 6A04                            push 	dword 4
  1346 0000088E EB2A                    	jmp	short which_irq
  1347                                  irq5:
  1348 00000890 6A05                            push 	dword 5
  1349 00000892 EB26                    	jmp	short which_irq
  1350                                  irq6:
  1351 00000894 6A06                            push 	dword 6
  1352 00000896 EB22                    	jmp	short which_irq
  1353                                  irq7:
  1354 00000898 6A07                            push 	dword 7
  1355 0000089A EB1E                    	jmp	short which_irq
  1356                                  irq8:
  1357 0000089C 6A08                            push 	dword 8
  1358 0000089E EB1A                    	jmp	short which_irq
  1359                                  irq9:
  1360 000008A0 6A09                            push 	dword 9
  1361 000008A2 EB16                    	jmp	short which_irq
  1362                                  irq10:
  1363 000008A4 6A0A                            push 	dword 10
  1364 000008A6 EB12                    	jmp	short which_irq
  1365                                  irq11:
  1366 000008A8 6A0B                            push 	dword 11
  1367 000008AA EB0E                    	jmp	short which_irq
  1368                                  irq12:
  1369 000008AC 6A0C                            push 	dword 12
  1370 000008AE EB0A                    	jmp	short which_irq
  1371                                  irq13:
  1372 000008B0 6A0D                            push 	dword 13
  1373 000008B2 EB06                    	jmp	short which_irq
  1374                                  irq14:
  1375 000008B4 6A0E                            push 	dword 14
  1376 000008B6 EB02                    	jmp	short which_irq
  1377                                  irq15:
  1378 000008B8 6A0F                            push 	dword 15
  1379                                  	;jmp	short which_irq
  1380                                  
  1381                                  	; 22/01/2017
  1382                                  	; 19/10/2015
  1383                                  	; 29/08/2014
  1384                                  	; 21/08/2014
  1385                                  which_irq:
  1386 000008BA 870424                  	xchg	eax, [esp]  ; 28/08/2014
  1387 000008BD 53                      	push	ebx
  1388 000008BE 56                      	push	esi
  1389 000008BF 57                      	push	edi
  1390 000008C0 1E                      	push 	ds
  1391 000008C1 06                      	push 	es
  1392                                  	;
  1393 000008C2 88C3                    	mov	bl, al
  1394                                  	;
  1395 000008C4 B810000000              	mov	eax, KDATA
  1396 000008C9 8ED8                    	mov	ds, ax
  1397 000008CB 8EC0                    	mov	es, ax
  1398                                  	; 19/10/2015
  1399 000008CD FC                      	cld
  1400                                          ; 27/08/2014
  1401 000008CE 8105[D6160100]A000-             add     dword [scr_row], 0A0h
  1401 000008D6 0000               
  1402                                  	;
  1403 000008D8 B417                    	mov	ah, 17h	; blue (1) background, 
  1404                                  			; light gray (7) forecolor
  1405 000008DA 8B3D[D6160100]                  mov     edi, [scr_row]
  1406 000008E0 B049                    	mov	al, 'I'
  1407 000008E2 66AB                    	stosw
  1408 000008E4 B052                    	mov	al, 'R'
  1409 000008E6 66AB                    	stosw
  1410 000008E8 B051                    	mov	al, 'Q'
  1411 000008EA 66AB                    	stosw
  1412 000008EC B020                    	mov	al, ' '
  1413 000008EE 66AB                    	stosw
  1414 000008F0 88D8                    	mov	al, bl
  1415 000008F2 3C0A                    	cmp	al, 10
  1416 000008F4 7208                    	jb	short ii1
  1417 000008F6 B031                    	mov	al, '1'
  1418 000008F8 66AB                    	stosw
  1419 000008FA 88D8                    	mov	al, bl
  1420 000008FC 2C0A                    	sub	al, 10
  1421                                  ii1:
  1422 000008FE 0430                    	add	al, '0'
  1423 00000900 66AB                    	stosw
  1424 00000902 B020                    	mov	al, ' '
  1425 00000904 66AB                    	stosw
  1426 00000906 B021                    	mov	al, '!'
  1427 00000908 66AB                    	stosw
  1428 0000090A B020                    	mov	al, ' '
  1429 0000090C 66AB                    	stosw
  1430                                  	; 23/02/2015
  1431 0000090E 80FB07                  	cmp	bl, 7 ; check for IRQ 8 to IRQ 15 
  1432 00000911 7604                    	jna	ii2
  1433                                  	; 22/01/2017
  1434 00000913 B020                    	mov	al, 20h  ; END OF INTERRUPT COMMAND TO
  1435 00000915 E6A0                    	out	0A0h, al ; the 2nd 8259
  1436                                  ii2:
  1437 00000917 B020                    	mov	al, 20h  ; END OF INTERRUPT COMMAND TO
  1438 00000919 E620                    	out	20h, al ; the 2nd 8259
  1439 0000091B E9CD010000              	jmp     iiret
  1440                                  	;
  1441                                  	; 22/08/2014
  1442                                  	;mov	al, 20h ; END OF INTERRUPT COMMAND TO 8259
  1443                                  	;out	20h, al	; 8259 PORT
  1444                                  	;
  1445                                  	;pop	es
  1446                                  	;pop	ds
  1447                                  	;pop	edi
  1448                                  	;pop	esi
  1449                                  	;pop	ebx
  1450                                  	;pop 	eax
  1451                                  	;iret
  1452                                  
  1453                                  	; 02/04/2015
  1454                                  	; 25/08/2014
  1455                                  exc0:
  1456 00000920 6A00                            push 	dword 0
  1457 00000922 E990000000                      jmp     cpu_except
  1458                                  exc1:
  1459 00000927 6A01                            push 	dword 1
  1460 00000929 E989000000                      jmp     cpu_except
  1461                                  exc2:
  1462 0000092E 6A02                            push 	dword 2
  1463 00000930 E982000000                      jmp     cpu_except
  1464                                  exc3:
  1465 00000935 6A03                            push 	dword 3
  1466 00000937 EB7E                            jmp     cpu_except
  1467                                  exc4:
  1468 00000939 6A04                            push 	dword 4
  1469 0000093B EB7A                            jmp     cpu_except
  1470                                  exc5:
  1471 0000093D 6A05                            push 	dword 5
  1472 0000093F EB76                            jmp     cpu_except
  1473                                  exc6:
  1474 00000941 6A06                            push 	dword 6
  1475 00000943 EB72                            jmp     cpu_except
  1476                                  exc7:
  1477 00000945 6A07                            push 	dword 7
  1478 00000947 EB6E                            jmp     cpu_except
  1479                                  exc8:
  1480                                  	; [esp] = Error code
  1481 00000949 6A08                            push 	dword 8
  1482 0000094B EB5C                            jmp     cpu_except_en
  1483                                  exc9:
  1484 0000094D 6A09                            push 	dword 9
  1485 0000094F EB66                            jmp     cpu_except
  1486                                  exc10:
  1487                                  	; [esp] = Error code
  1488 00000951 6A0A                            push 	dword 10
  1489 00000953 EB54                            jmp     cpu_except_en
  1490                                  exc11:
  1491                                  	; [esp] = Error code
  1492 00000955 6A0B                            push 	dword 11
  1493 00000957 EB50                            jmp     cpu_except_en
  1494                                  exc12:
  1495                                  	; [esp] = Error code
  1496 00000959 6A0C                            push 	dword 12
  1497 0000095B EB4C                            jmp     cpu_except_en
  1498                                  exc13:
  1499                                  	; [esp] = Error code
  1500 0000095D 6A0D                            push 	dword 13
  1501 0000095F EB48                            jmp     cpu_except_en
  1502                                  exc14:
  1503                                  	; [esp] = Error code
  1504 00000961 6A0E                            push 	dword 14
  1505 00000963 EB44                    	jmp	short cpu_except_en
  1506                                  exc15:
  1507 00000965 6A0F                            push 	dword 15
  1508 00000967 EB4E                            jmp     cpu_except
  1509                                  exc16:
  1510 00000969 6A10                            push 	dword 16
  1511 0000096B EB4A                            jmp     cpu_except
  1512                                  exc17:
  1513                                  	; [esp] = Error code
  1514 0000096D 6A11                            push 	dword 17
  1515 0000096F EB38                    	jmp	short cpu_except_en
  1516                                  exc18:
  1517 00000971 6A12                            push 	dword 18
  1518 00000973 EB42                    	jmp	short cpu_except
  1519                                  exc19:
  1520 00000975 6A13                            push 	dword 19
  1521 00000977 EB3E                    	jmp	short cpu_except
  1522                                  exc20:
  1523 00000979 6A14                            push 	dword 20
  1524 0000097B EB3A                    	jmp	short cpu_except
  1525                                  exc21:
  1526 0000097D 6A15                            push 	dword 21
  1527 0000097F EB36                    	jmp	short cpu_except
  1528                                  exc22:
  1529 00000981 6A16                            push 	dword 22
  1530 00000983 EB32                    	jmp	short cpu_except
  1531                                  exc23:
  1532 00000985 6A17                            push 	dword 23
  1533 00000987 EB2E                    	jmp	short cpu_except
  1534                                  exc24:
  1535 00000989 6A18                            push 	dword 24
  1536 0000098B EB2A                    	jmp	short cpu_except
  1537                                  exc25:
  1538 0000098D 6A19                            push 	dword 25
  1539 0000098F EB26                    	jmp	short cpu_except
  1540                                  exc26:
  1541 00000991 6A1A                            push 	dword 26
  1542 00000993 EB22                    	jmp	short cpu_except
  1543                                  exc27:
  1544 00000995 6A1B                            push 	dword 27
  1545 00000997 EB1E                    	jmp	short cpu_except
  1546                                  exc28:
  1547 00000999 6A1C                            push 	dword 28
  1548 0000099B EB1A                    	jmp	short cpu_except
  1549                                  exc29:
  1550 0000099D 6A1D                            push 	dword 29
  1551 0000099F EB16                    	jmp	short cpu_except
  1552                                  exc30:
  1553 000009A1 6A1E                            push 	dword 30
  1554 000009A3 EB04                    	jmp	short cpu_except_en
  1555                                  exc31:
  1556 000009A5 6A1F                            push 	dword 31
  1557 000009A7 EB0E                            jmp     short cpu_except
  1558                                  
  1559                                  	; 19/10/2015
  1560                                  	; 19/09/2015
  1561                                  	; 01/09/2015
  1562                                  	; 28/08/2015
  1563                                  	; 28/08/2014
  1564                                  cpu_except_en:
  1565 000009A9 87442404                	xchg	eax, [esp+4] ; Error code
  1566 000009AD 36A3[78050300]          	mov	[ss:error_code], eax
  1567 000009B3 58                      	pop	eax  ; Exception number
  1568 000009B4 870424                  	xchg	eax, [esp]
  1569                                  		; eax = eax before exception
  1570                                  		; [esp] -> exception number
  1571                                  		; [esp+4] -> EIP to return
  1572                                  	; 22/01/2017
  1573                                  	; 19/10/2015
  1574                                  	; 19/09/2015
  1575                                  	; 01/09/2015
  1576                                  	; 28/08/2015
  1577                                  	; 29/08/2014
  1578                                  	; 28/08/2014
  1579                                  	; 25/08/2014
  1580                                  	; 21/08/2014
  1581                                  cpu_except:	; CPU Exceptions
  1582 000009B7 FC                      	cld
  1583 000009B8 870424                  	xchg	eax, [esp] 
  1584                                  		; eax = Exception number
  1585                                  		; [esp] = eax (before exception)	
  1586 000009BB 53                      	push	ebx
  1587 000009BC 56                      	push	esi
  1588 000009BD 57                      	push	edi
  1589 000009BE 1E                      	push 	ds
  1590 000009BF 06                      	push 	es
  1591                                  	; 28/08/2015
  1592 000009C0 66BB1000                	mov	bx, KDATA
  1593 000009C4 8EDB                    	mov	ds, bx
  1594 000009C6 8EC3                    	mov	es, bx
  1595 000009C8 0F20DB                  	mov	ebx, cr3
  1596 000009CB 53                      	push	ebx ; (*) page directory
  1597                                  	; 19/10/2015
  1598 000009CC FC                      	cld
  1599                                  	; 25/03/2015
  1600 000009CD 8B1D[C0580100]          	mov	ebx, [k_page_dir]
  1601 000009D3 0F22DB                  	mov	cr3, ebx
  1602                                  	; 28/08/2015
  1603 000009D6 83F80E                  	cmp	eax, 0Eh ; 14, PAGE FAULT	
  1604 000009D9 750F                    	jne	short cpu_except_nfp
  1605 000009DB E8CF440000              	call	page_fault_handler
  1606 000009E0 21C0                    	and 	eax, eax
  1607 000009E2 0F8401010000                    jz	iiretp ; 01/09/2015
  1608 000009E8 B00E                    	mov	al, 0Eh ; 14
  1609                                  cpu_except_nfp:
  1610                                  	; 23/08/2016
  1611 000009EA 803D[225F0000]03        	cmp	byte [CRT_MODE], 3
  1612 000009F1 7409                    	je	short cpu_except_mode_3
  1613 000009F3 50                      	push	eax
  1614 000009F4 B003                    	mov	al, 3
  1615 000009F6 E8730B0000              	call	_set_mode
  1616 000009FB 58                      	pop	eax
  1617                                  cpu_except_mode_3:
  1618                                  	; 02/04/2015
  1619 000009FC BB[4B060000]            	mov	ebx, hang
  1620 00000A01 875C241C                	xchg	ebx, [esp+28]
  1621                                  		; EIP (points to instruction which faults)
  1622                                  	  	; New EIP (hang)
  1623 00000A05 891D[7C050300]          	mov	[FaultOffset], ebx
  1624 00000A0B C744242008000000        	mov	dword [esp+32], KCODE ; kernel's code segment
  1625 00000A13 814C242400020000        	or	dword [esp+36], 200h ; enable interrupts (set IF)
  1626                                  	;
  1627 00000A1B 88C4                    	mov	ah, al
  1628 00000A1D 240F                    	and	al, 0Fh
  1629 00000A1F 3C09                    	cmp	al, 9
  1630 00000A21 7602                    	jna	short h1ok
  1631 00000A23 0407                    	add	al, 'A'-':'
  1632                                  h1ok:
  1633 00000A25 C0EC04                  	shr	ah, 4
  1634 00000A28 80FC09                  	cmp	ah, 9
  1635 00000A2B 7603                    	jna	short h2ok
  1636 00000A2D 80C407                  	add	ah, 'A'-':'
  1637                                  h2ok:	
  1638 00000A30 86E0                    	xchg 	ah, al	
  1639 00000A32 66053030                	add	ax, '00'
  1640 00000A36 66A3[30190100]          	mov	[excnstr], ax
  1641                                  	;
  1642                                  	; 29/08/2014
  1643 00000A3C A1[7C050300]            	mov	eax, [FaultOffset]
  1644 00000A41 51                      	push	ecx
  1645 00000A42 52                      	push	edx
  1646 00000A43 89E3                    	mov	ebx, esp
  1647                                  	; 28/08/2015
  1648 00000A45 B910000000              	mov	ecx, 16	  ; divisor value to convert binary number
  1649                                  			  ; to hexadecimal string
  1650                                  	;mov	ecx, 10	    ; divisor to convert	
  1651                                  			    ; binary number to decimal string
  1652                                  b2d1:
  1653 00000A4A 31D2                    	xor	edx, edx
  1654 00000A4C F7F1                    	div	ecx
  1655 00000A4E 6652                    	push	dx
  1656 00000A50 39C8                    	cmp	eax, ecx
  1657 00000A52 73F6                    	jnb	short b2d1
  1658 00000A54 BF[3B190100]            	mov	edi, EIPstr ; EIP value
  1659                                  			    ; points to instruction which faults	
  1660                                  	; 28/08/2015
  1661 00000A59 89C2                    	mov	edx, eax
  1662                                  b2d2:
  1663                                  	;add	al, '0'
  1664 00000A5B 8A82[24330000]          	mov	al, [edx+hexchrs]
  1665 00000A61 AA                      	stosb		    ; write hexadecimal digit to its place	
  1666 00000A62 39E3                    	cmp	ebx, esp
  1667 00000A64 7606                    	jna	short b2d3
  1668 00000A66 6658                    	pop	ax
  1669 00000A68 88C2                    	mov	dl, al
  1670 00000A6A EBEF                    	jmp	short b2d2
  1671                                  b2d3:
  1672 00000A6C B068                    	mov 	al, 'h' ; 28/08/2015
  1673 00000A6E AA                      	stosb
  1674 00000A6F B020                    	mov	al, 20h	    ; space
  1675 00000A71 AA                      	stosb
  1676 00000A72 30C0                    	xor	al, al	    ; to do it an ASCIIZ string	
  1677 00000A74 AA                      	stosb
  1678                                  	;
  1679 00000A75 5A                      	pop	edx
  1680 00000A76 59                      	pop	ecx
  1681                                  	;
  1682 00000A77 B44F                    	mov	ah, 4Fh	; red (4) background, 
  1683                                  			; white (F) forecolor
  1684 00000A79 BE[20190100]            	mov	esi, exc_msg ; message offset
  1685                                  	;
  1686                                  	; 20/01/2017 (!cpu exception!)
  1687                                  	;
  1688 00000A7E 8105[D6160100]A000-             add    dword [scr_row], 0A0h
  1688 00000A86 0000               
  1689 00000A88 8B3D[D6160100]                  mov    edi, [scr_row]
  1690                                  	;	
  1691 00000A8E C605[5B030300]00        	mov	byte [sysflg], 0  ; system mode
  1692 00000A95 FB                              sti
  1693                                  	;
  1694 00000A96 E8EFFBFFFF              	call 	printk
  1695                                  	;
  1696 00000A9B B410                    	mov	ah, 10h
  1697 00000A9D E87D010000              	call	int16h ; getc
  1698                                  	;
  1699 00000AA2 B003                    	mov	al, 3
  1700 00000AA4 E8C50A0000              	call	_set_mode
  1701                                  	;
  1702 00000AA9 B801000000              	mov	eax, 1
  1703 00000AAE E936BE0000              	jmp	sysexit ; terminate process !!!
  1704                                  	
  1705                                  	; 22/01/2017
  1706                                  	; 18/04/2016
  1707                                  	; 28/08/2015
  1708                                  	; 23/02/2015
  1709                                  	; 20/08/2014
  1710                                  ignore_int:
  1711 00000AB3 50                      	push	eax
  1712 00000AB4 53                      	push	ebx ; 23/02/2015
  1713 00000AB5 56                      	push	esi
  1714 00000AB6 57                      	push	edi
  1715 00000AB7 1E                      	push 	ds
  1716 00000AB8 06                      	push 	es
  1717                                  	; 18/04/2016
  1718 00000AB9 66B81000                	mov	ax, KDATA
  1719 00000ABD 8ED8                    	mov	ds, ax
  1720 00000ABF 8EC0                    	mov	es, ax
  1721                                  	; 28/08/2015
  1722 00000AC1 0F20D8                  	mov	eax, cr3
  1723 00000AC4 50                      	push	eax ; (*) page directory
  1724                                  	;
  1725 00000AC5 B467                    	mov	ah, 67h	; brown (6) background, 
  1726                                  			; light gray (7) forecolor
  1727 00000AC7 BE[E8170100]            	mov	esi, int_msg ; message offset
  1728                                  piemsg:
  1729                                          ; 27/08/2014
  1730 00000ACC 8105[D6160100]A000-             add     dword [scr_row], 0A0h
  1730 00000AD4 0000               
  1731 00000AD6 8B3D[D6160100]                  mov     edi, [scr_row]
  1732                                          ;
  1733 00000ADC E8A9FBFFFF              	call 	printk
  1734                                  	;
  1735                                  	; 23/02/2015
  1736 00000AE1 B020                    	mov	al, 20h  ; END OF INTERRUPT COMMAND TO
  1737 00000AE3 E6A0                    	out	0A0h, al ; the 2nd 8259
  1738                                  	; 22/08/2014
  1739 00000AE5 B020                    	mov	al, 20h ; END OF INTERRUPT COMMAND TO 8259
  1740 00000AE7 E620                    	out	20h, al	; 8259 PORT
  1741                                  iiretp: 
  1742                                  	; 22/01/2017
  1743                                  	; 01/09/2015
  1744                                  	; 28/08/2015
  1745 00000AE9 58                      	pop	eax ; (*) page directory
  1746 00000AEA 0F22D8                  	mov	cr3, eax
  1747                                  iiret:
  1748 00000AED 07                      	pop	es
  1749 00000AEE 1F                      	pop	ds
  1750 00000AEF 5F                      	pop	edi
  1751 00000AF0 5E                      	pop	esi
  1752 00000AF1 5B                      	pop	ebx ; 29/08/2014
  1753 00000AF2 58                      	pop 	eax
  1754 00000AF3 CF                      	iretd
  1755                                  
  1756                                  	; 23/05/2016
  1757                                  	; 22/08/2014
  1758                                  	; IBM PC/AT BIOS source code ----- 10/06/85 (bios.asm)
  1759                                  	; (INT 1Ah)
  1760                                  	;; Linux (v0.12) source code (main.c) by Linus Torvalds (1991)
  1761                                  time_of_day:
  1762 00000AF4 E842510000              	call	UPD_IPR			; WAIT TILL UPDATE NOT IN PROGRESS
  1763 00000AF9 726F                            jc      short time_of_day_retn ; 23/05/2016
  1764 00000AFB B000                    	mov	al, CMOS_SECONDS
  1765 00000AFD E854510000              	call	CMOS_READ
  1766 00000B02 A2[30590100]            	mov	[time_seconds], al 
  1767 00000B07 B002                    	mov	al, CMOS_MINUTES
  1768 00000B09 E848510000              	call	CMOS_READ
  1769 00000B0E A2[31590100]            	mov	[time_minutes], al 
  1770 00000B13 B004                    	mov	al, CMOS_HOURS
  1771 00000B15 E83C510000              	call	CMOS_READ
  1772 00000B1A A2[32590100]                    mov     [time_hours], al
  1773 00000B1F B006                    	mov	al, CMOS_DAY_WEEK 
  1774 00000B21 E830510000              	call	CMOS_READ
  1775 00000B26 A2[33590100]            	mov	[date_wday], al
  1776 00000B2B B007                     	mov	al, CMOS_DAY_MONTH
  1777 00000B2D E824510000              	call	CMOS_READ
  1778 00000B32 A2[34590100]            	mov	[date_day], al
  1779 00000B37 B008                    	mov	al, CMOS_MONTH
  1780 00000B39 E818510000              	call	CMOS_READ
  1781 00000B3E A2[35590100]            	mov	[date_month], al
  1782 00000B43 B009                    	mov	al, CMOS_YEAR
  1783 00000B45 E80C510000              	call	CMOS_READ
  1784 00000B4A A2[36590100]            	mov	[date_year], al
  1785 00000B4F B032                    	mov	al, CMOS_CENTURY
  1786 00000B51 E800510000              	call	CMOS_READ
  1787 00000B56 A2[37590100]            	mov	[date_century], al
  1788                                  	;
  1789 00000B5B B000                    	mov	al, CMOS_SECONDS
  1790 00000B5D E8F4500000              	call 	CMOS_READ
  1791 00000B62 3A05[30590100]          	cmp	al, [time_seconds]
  1792 00000B68 758A                    	jne	short time_of_day
  1793                                  
  1794                                  time_of_day_retn:
  1795 00000B6A C3                      	retn
  1796                                  
  1797                                  	; 15/01/2017
  1798                                  	; 10/06/2016
  1799                                  	; 07/06/2016
  1800                                  	; 06/06/2016
  1801                                  	; 23/05/2016
  1802                                  rtc_p:
  1803 00000B6B B101                    	mov	cl, 1 ; 15/01/2017
  1804 00000B6D EB02                    	jmp	short rtc_p0
  1805                                  u_timer: 
  1806                                  	; Timer Events with 18.2 Hz Timer Ticks
  1807                                  	; (and also timer events with RTC seconds)
  1808 00000B6F 28C9                    	sub	cl, cl ; mov cl, 0 ; 15/01/2017
  1809                                  rtc_p0:
  1810                                  	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  1811                                  	; Major Modification:
  1812                                  	; Check and Perform Timer Events (for RTC)
  1813                                  	; 25/08/2014 - 07/09/2014
  1814                                  	; Retro UNIX 386 v1:
  1815                                   	; Print Real Time Clock content
  1816                                  	
  1817                                  	; 15/01/2017
  1818 00000B71 880D[50650100]          	mov	byte [priority], cl ; 0 or 1 (not 2)
  1819 00000B77 8A2D[53650100]          	mov	ch, [timer_events]
  1820 00000B7D 20ED                    	and	ch, ch
  1821 00000B7F 7420                    	jz	short rtc_p3
  1822                                  
  1823 00000B81 BE[60040300]            	mov	esi, timer_set  ; beginning address of
  1824                                  				; timer events space
  1825                                  rtc_p1:
  1826 00000B86 8B06                    	mov	eax, [esi]	
  1827 00000B88 20C0                    	and	al, al ; 0 = free, >0 = process no.
  1828 00000B8A 7416                    	jz	short rtc_p4
  1829                                  	;
  1830 00000B8C C1C810                  	ror	eax, 16
  1831                                  	; ah = response value, al = interrupt type
  1832                                  	; 15/01/2017
  1833                                  	; cl = interrupt source
  1834                                  	;       1 = RTC, 0 = PIT  	 	
  1835 00000B8F 38C8                    	cmp	al, cl 
  1836 00000B91 750A                    	jne	short rtc_p2 ; not as requested or undefined !
  1837 00000B93 3C01                    	cmp	al, 1 ; 1 ; RTC interrupt ?
  1838 00000B95 7410                    	je	short rtc_p5 ; yes, check for response
  1839                                  	; 06/06/2016 - 18.2 Hz Timer Ticks
  1840 00000B97 836E080A                	sub	dword [esi+8], 10 ; 1 tick = 10
  1841 00000B9B 7613                    	jna	short rtc_p6  ; continue for responding
  1842                                  rtc_p2:
  1843                                  	; 15/01/2017 (cl -> ch)
  1844                                  	; 07/06/2016
  1845 00000B9D FECD                    	dec	ch    ; remain count of timer events	
  1846 00000B9F 7501                    	jnz	short rtc_p4
  1847                                  rtc_p3:	 
  1848 00000BA1 C3                      	retn
  1849                                  rtc_p4:	
  1850                                  	;cmp	esi, timer_set + 240 ; 15*16 (last event)
  1851                                  	;jnb	short rtc_p3 ; end of timer event space
  1852 00000BA2 83C610                  	add	esi, 16 ; next timer event
  1853 00000BA5 EBDF                    	jmp	short rtc_p1
  1854                                  rtc_p5:	 
  1855                                  	; current timer count ; 06/06/2016 (182)
  1856 00000BA7 816E08B6000000          	sub	dword [esi+8], 182 ; 1 second (10*18.2)
  1857 00000BAE 77ED                    	ja	short rtc_p2  ; check for the next 
  1858                                  rtc_p6:	
  1859                                  	; it is the time of response! 
  1860 00000BB0 8B5E04                  	mov	ebx, [esi+4] ; set (count limit) value
  1861 00000BB3 895E08                  	mov	[esi+8], ebx ; reset count down value
  1862                                  			     ; to count limit
  1863                                  	; 19/12/2016
  1864                                  	; 10/12/2016 - timer callback modification
  1865 00000BB6 8B7E0C                  	mov	edi, [esi+12] ; response (or callback) address	
  1866 00000BB9 807E0100                	cmp	byte [esi+1], 0 ; >0 = callback
  1867 00000BBD 762A                    	jna	short rtc_p8
  1868                                  
  1869                                  	; timer callback !
  1870 00000BBF 0FB61E                  	movzx	ebx, byte [esi] ; process number (>0)
  1871 00000BC2 89D8                    	mov	eax, ebx
  1872 00000BC4 C0E302                  	shl	bl, 2 ; *4
  1873 00000BC7 89BB[0C010300]          	mov	[ebx+p.tcb-4], edi ; user's callback service addr
  1874 00000BCD 3A05[B3030300]          	cmp	al, [u.uno]
  1875 00000BD3 7521                    	jne	short rtc_p9
  1876 00000BD5 893D[D0030300]          	mov	[u.tcb], edi
  1877                                  rtc_p7:
  1878                                  	; 15/01/2017
  1879 00000BDB B002                    	mov	al, 2
  1880 00000BDD A2[50650100]            	mov	[priority], al ; 2
  1881                                  	; 10/01/2017
  1882                                  	;mov	byte [u.pri], 2
  1883 00000BE2 A2[A9030300]            	mov	[u.pri], al ; 2
  1884 00000BE7 EBB4                    	jmp	short rtc_p2
  1885                                  rtc_p8:
  1886                                  	; response address is physical address of
  1887                                  	; the program's response (signal return) byte
  1888                                  	; 06/06/2016
  1889                                  	;mov	edi, [esi+12] ; response address
  1890 00000BE9 8827                    	mov	[edi], ah     ; response value 
  1891                                  	;
  1892 00000BEB C1C010                  	rol	eax, 16
  1893                                  	; 15/01/2017
  1894 00000BEE 3A05[B3030300]          	cmp	al, [u.uno] ; running process ?
  1895 00000BF4 74E5                    	je	short rtc_p7
  1896                                  rtc_p9:
  1897                                  	; al = process number  ; 10/06/2016
  1898 00000BF6 B202                    	mov	dl, 2 ; priority, 2 = event (high)	
  1899 00000BF8 E872ED0000              	call	set_run_sequence ; 19/05/2016
  1900 00000BFD EB9E                    	jmp	short rtc_p2 ; 10/06/2016
  1901                                  
  1902                                  
  1903                                  ; Default IRQ 7 handler against spurious IRQs (from master PIC)
  1904                                  ; 25/02/2015 (source: http://wiki.osdev.org/8259_PIC)
  1905                                  default_irq7:
  1906 00000BFF 6650                    	push	ax
  1907 00000C01 B00B                    	mov	al, 0Bh  ; In-Service register
  1908 00000C03 E620                    	out	20h, al
  1909 00000C05 EB00                            jmp short $+2
  1910 00000C07 EB00                    	jmp short $+2
  1911 00000C09 E420                    	in	al, 20h
  1912 00000C0B 2480                    	and 	al, 80h ; bit 7 (is it real IRQ 7 or fake?)
  1913 00000C0D 7404                            jz      short irq7_iret ; Fake (spurious) IRQ, do not send EOI 
  1914 00000C0F B020                            mov     al, 20h ; EOI
  1915 00000C11 E620                    	out	20h, al 
  1916                                  irq7_iret:
  1917 00000C13 6658                    	pop	ax
  1918 00000C15 CF                      	iretd
  1919                                  	
  1920                                  bcd_to_ascii:
  1921                                  	; 25/08/2014
  1922                                  	; INPUT ->
  1923                                  	;	al = Packed BCD number
  1924                                  	; OUTPUT ->
  1925                                  	;	ax  = ASCII word/number
  1926                                  	;
  1927                                  	; Erdogan Tan - 1998 (proc_hex) - TRDOS.ASM (2004-2011)
  1928                                  	;
  1929 00000C16 D410                    	db 0D4h,10h                     ; Undocumented inst. AAM
  1930                                  					; AH = AL / 10h
  1931                                  					; AL = AL MOD 10h
  1932 00000C18 660D3030                	or ax,'00'                      ; Make it ASCII based
  1933                                  
  1934 00000C1C 86E0                            xchg ah, al 
  1935                                  	
  1936 00000C1E C3                      	retn	
  1937                                  	
  1938                                  
  1939                                  %include 'keyboard.s' ; 07/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - keyboard.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 15/01/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 17/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; keyboard.inc (17/10/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - KEYBOARD.INC
    20                              <1> ; Last Modification: 17/10/2015
    21                              <1> ;		    (Keyboard Data is in 'KYBDATA.INC')	
    22                              <1> ;
    23                              <1> ; ///////// KEYBOARD FUNCTIONS (PROCEDURES) ///////////////
    24                              <1> 
    25                              <1> ; 17/01/2016 (TRDOS 386 = TRDOS v2.0)
    26                              <1> 
    27                              <1> ; 03/12/2014
    28                              <1> ; 26/08/2014
    29                              <1> ; KEYBOARD I/O
    30                              <1> ; (INT_16h - Retro UNIX 8086 v1 - U9.ASM, 30/06/2014)
    31                              <1> 
    32                              <1> ;NOTE: 'k0' to 'k7' are name of OPMASK registers.
    33                              <1> ;	(The reason of using '_k' labels!!!) (27/08/2014)    
    34                              <1> ;NOTE: 'NOT' keyword is '~' unary operator in NASM.
    35                              <1> ;	('NOT LC_HC' --> '~LC_HC') (bit reversing operator)
    36                              <1> 
    37                              <1> int16h:	; 30/06/2015
    38                              <1> ;getc:
    39 00000C1F 9C                  <1> 	pushfd	; 28/08/2014
    40 00000C20 0E                  <1> 	push 	cs
    41 00000C21 E801000000          <1> 	call 	KEYBOARD_IO_1 ; getc_int
    42 00000C26 C3                  <1> 	retn	
    43                              <1> 
    44                              <1> getc_int:
    45                              <1> 	; 28/02/2015
    46                              <1> 	; 03/12/2014 (derivation from pc-xt-286 bios source code -1986-, 
    47                              <1> 	;	      instead of pc-at bios - 1985-)
    48                              <1> 	; 28/08/2014 (_k1d)
    49                              <1> 	; 30/06/2014
    50                              <1> 	; 03/03/2014
    51                              <1> 	; 28/02/2014
    52                              <1> 	; Derived from "KEYBOARD_IO_1" procedure of IBM "pc-xt-286" 
    53                              <1> 	; rombios source code (21/04/1986)
    54                              <1> 	;	 'keybd.asm', INT 16H, KEYBOARD_IO
    55                              <1> 	;
    56                              <1> 	; KYBD --- 03/06/86  KEYBOARD BIOS
    57                              <1> 	;
    58                              <1> 	;--- INT 16 H -----------------------------------------------------------------
    59                              <1> 	; KEYBOARD I/O								      :
    60                              <1> 	;	THESE ROUTINES PROVIDE READ KEYBOARD SUPPORT			      :
    61                              <1> 	; INPUT									      :
    62                              <1> 	;	(AH)= 00H  READ THE NEXT ASCII CHARACTER ENTERED FROM THE KEYBOARD,   :
    63                              <1> 	;		   RETURN THE RESULT IN (AL), SCAN CODE IN (AH).              :
    64                              <1> 	;		   THIS IS THE COMPATIBLE READ INTERFACE, EQUIVALENT TO THE   :
    65                              <1> 	;                  STANDARD PC OR PCAT KEYBOARD				      :	
    66                              <1> 	;-----------------------------------------------------------------------------:
    67                              <1> 	;	(AH)= 01H  SET THE ZERO FLAG TO INDICATE IF AN ASCII CHARACTER IS     :
    68                              <1> 	;		   AVAILABLE TO BE READ FROM THE KEYBOARD BUFFER.	      :
    69                              <1> 	;		   (ZF)= 1 -- NO CODE AVAILABLE			              :
    70                              <1> 	;		   (ZF)= 0 -- CODE IS AVAILABLE  (AX)= CHARACTER              :
    71                              <1> 	;		   IF (ZF)= 0, THE NEXT CHARACTER IN THE BUFFER TO BE READ IS :
    72                              <1> 	;		   IN (AX), AND THE ENTRY REMAINS IN THE BUFFER.              :
    73                              <1> 	;		   THIS WILL RETURN ONLY PC/PCAT KEYBOARD COMPATIBLE CODES    :
    74                              <1> 	;-----------------------------------------------------------------------------:	
    75                              <1> 	;	(AH)= 02H  RETURN THE CURRENT SHIFT STATUS IN AL REGISTER             :
    76                              <1> 	;		   THE BIT SETTINGS FOR THIS CODE ARE INDICATED IN THE        :
    77                              <1> 	;		   EQUATES FOR @KB_FLAG		                              :
    78                              <1> 	;-----------------------------------------------------------------------------:	
    79                              <1> 	;	(AH)= 03H  SET TYPAMATIC RATE AND DELAY                               :
    80                              <1> 	;	      (AL) = 05H                                                      :
    81                              <1> 	;	      (BL) = TYPAMATIC RATE (BITS 5 - 7 MUST BE RESET TO 0)           :
    82                              <1> 	;		       							      :
    83                              <1> 	;                     REGISTER     RATE      REGISTER     RATE                :
    84                              <1> 	;                      VALUE     SELECTED     VALUE     SELECTED              :
    85                              <1> 	;                     --------------------------------------------            :
    86                              <1> 	;			00H        30.0        10H        7.5                 :
    87                              <1> 	;			01H        26.7        11H        6.7                 :
    88                              <1> 	;			02H        24.0        12H        6.0                 :
    89                              <1> 	;			03H        21.8        13H        5.5                 :
    90                              <1> 	;			04H        20.0        14H        5.0                 :
    91                              <1> 	;			05H        18.5        15H        4.6                 :
    92                              <1> 	;			06H        17.1        16H        4.3                 :
    93                              <1> 	;			07H        16.0        17H        4.0                 :
    94                              <1> 	;			08H        15.0        18H        3.7                 :
    95                              <1> 	;			09H        13.3        19H        3.3                 :
    96                              <1> 	;			0AH        12.0        1AH        3.0                 :
    97                              <1> 	;			0BH        10.9        1BH        2.7                 :
    98                              <1>         ;			0CH        10.0        1CH        2.5                 :
    99                              <1> 	;			0DH         9.2        1DH        2.3                 :
   100                              <1> 	;			0EH         8.6        1EH        2.1                 :
   101                              <1> 	;			0FH         8.0        1FH        2.0                 :
   102                              <1> 	;									      :
   103                              <1> 	;	      (BH) = TYPAMATIC DELAY  (BITS 2 - 7 MUST BE RESET TO 0)         :
   104                              <1> 	;		       							      :
   105                              <1> 	;                     REGISTER     DELAY                                      :
   106                              <1> 	;                      VALUE       VALUE                                      :
   107                              <1> 	;                     ------------------                                      :
   108                              <1> 	;			00H        250 ms                                     :
   109                              <1> 	;			01H        500 ms                                     :
   110                              <1> 	;			02H        750 ms                                     :
   111                              <1> 	;			03H       1000 ms                                     :
   112                              <1> 	;-----------------------------------------------------------------------------:
   113                              <1> 	;	(AH)= 05H  PLACE ASCII CHARACTER/SCAN CODE COMBINATION IN KEYBOARD    :
   114                              <1> 	;		   BUFFER AS IF STRUCK FROM KEYBOARD                          :
   115                              <1> 	;		   ENTRY:  (CL) = ASCII CHARACTER		              :
   116                              <1> 	;		           (CH) = SCAN CODE                                   :
   117                              <1> 	;		   EXIT:   (AH) = 00H = SUCCESSFUL OPERATION                  :
   118                              <1> 	;		           (AL) = 01H = UNSUCCESSFUL - BUFFER FULL            :
   119                              <1> 	;		   FLAGS:  CARRY IF ERROR                                     :
   120                              <1> 	;-----------------------------------------------------------------------------:		
   121                              <1> 	;	(AH)= 10H  EXTENDED READ INTERFACE FOR THE ENHANCED KEYBOARD,         :
   122                              <1> 	;		   OTHERWISE SAME AS FUNCTION AH=0                            :
   123                              <1> 	;-----------------------------------------------------------------------------:
   124                              <1> 	;	(AH)= 11H  EXTENDED ASCII STATUS FOR THE ENHANCED KEYBOARD,           :
   125                              <1> 	;		   OTHERWISE SAME AS FUNCTION AH=1                            :
   126                              <1> 	;-----------------------------------------------------------------------------:	
   127                              <1> 	;	(AH)= 12H  RETURN THE EXTENDED SHIFT STATUS IN AX REGISTER            :
   128                              <1> 	;		   AL = BITS FROM KB_FLAG, AH = BITS FOR LEFT AND RIGHT       :
   129                              <1> 	;		   CTL AND ALT KEYS FROM KB_FLAG_1 AND KB_FLAG_3              :
   130                              <1> 	; OUTPUT					                              :
   131                              <1> 	;	AS NOTED ABOVE, ONLY (AX) AND FLAGS CHANGED	                      :
   132                              <1> 	;	ALL REGISTERS RETAINED		                                      :
   133                              <1> 	;------------------------------------------------------------------------------
   134                              <1> 
   135                              <1> ; 15/01/2017
   136                              <1> ; 14/01/2017
   137                              <1> ; 02/01/2017
   138                              <1> ; 29/05/2016
   139                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   140                              <1> int32h:  ; Keyboard BIOS
   141                              <1> 
   142                              <1> KEYBOARD_IO_1:	
   143                              <1> 	;sti				; INTERRUPTS BACK ON
   144                              <1> 	; 29/05/2016
   145 00000C27 80642408BE          <1>         and     byte [esp+8], 10111110b ; clear zero flag and cary flag
   146                              <1> 	;
   147 00000C2C 1E                  <1> 	push	ds			; SAVE CURRENT DS
   148 00000C2D 53                  <1> 	push	ebx			; SAVE BX TEMPORARILY
   149                              <1> 	;push	ecx			; SAVE CX TEMPORARILY
   150 00000C2E 66BB1000            <1>         mov     bx, KDATA 
   151 00000C32 8EDB                <1> 	mov	ds, bx			; PUT SEGMENT VALUE OF DATA AREA INTO DS
   152                              <1> 
   153                              <1> 	; 14/01/2017
   154 00000C34 8B1C24              <1> 	mov	ebx, [esp]
   155                              <1> 	;; 15/01/2017
   156                              <1> 	; 02/01/2017
   157                              <1> 	;;mov	byte [intflg], 32h	; keyboard interrupt 
   158 00000C37 FB                  <1> 	sti
   159                              <1> 	;
   160                              <1> 
   161 00000C38 08E4                <1> 	or	ah, ah			; CHECK FOR (AH)= 00H
   162 00000C3A 743A                <1> 	jz	short _K1		; ASCII_READ
   163 00000C3C FECC                <1> 	dec	ah                      ; CHECK FOR (AH)= 01H
   164 00000C3E 7453                <1>         jz      short _K2               ; ASCII_STATUS
   165 00000C40 FECC                <1> 	dec	ah			; CHECK FOR (AH)= 02H
   166 00000C42 0F8494000000        <1>         jz      _K3                     ; SHIFT STATUS
   167 00000C48 FECC                <1> 	dec	ah			; CHECK FOR (AH)= 03H	
   168 00000C4A 0F8493000000        <1>         jz      _K300                   ; SET TYPAMATIC RATE/DELAY
   169 00000C50 80EC02              <1> 	sub	ah, 2			; CHECK FOR (AH)= 05H	
   170 00000C53 0F84BC000000        <1>         jz      _K500                   ; KEYBOARD WRITE         
   171                              <1> _KIO1:	
   172 00000C59 80EC0B              <1> 	sub	ah, 11			; AH =  10H
   173 00000C5C 740C                <1> 	jz	short _K1E		; EXTENDED ASCII READ
   174 00000C5E FECC                <1> 	dec	ah			; CHECK FOR (AH)= 11H
   175 00000C60 7422                <1> 	jz	short _K2E		; EXTENDED_ASCII_STATUS
   176 00000C62 FECC                <1> 	dec	ah			; CHECK FOR (AH)= 12H
   177 00000C64 7458                <1> 	jz	short _K3E		; EXTENDED_SHIFT_STATUS
   178                              <1> _KIO_EXIT:
   179                              <1> 	; 02/01/2017
   180 00000C66 FA                  <1> 	cli
   181                              <1> 	;;mov	byte [intflg], 0 ;; 15/01/2017
   182                              <1> 	;
   183                              <1> 	;pop	ecx			; RECOVER REGISTER
   184 00000C67 5B                  <1> 	pop	ebx			; RECOVER REGISTER
   185 00000C68 1F                  <1> 	pop	ds			; RECOVER SEGMENT
   186 00000C69 CF                  <1> 	iretd				; INVALID COMMAND, EXIT
   187                              <1> 
   188                              <1> 	;-----	ASCII CHARACTER
   189                              <1> _K1E:	
   190 00000C6A E8D3000000          <1> 	call	_K1S			; GET A CHARACTER FROM THE BUFFER (EXTENDED)
   191 00000C6F E848010000          <1> 	call	_KIO_E_XLAT		; ROUTINE TO XLATE FOR EXTENDED CALLS
   192 00000C74 EBF0                <1> 	jmp	short _KIO_EXIT         ; GIVE IT TO THE CALLER
   193                              <1> _K1:	
   194 00000C76 E8C7000000          <1> 	call	_K1S			; GET A CHARACTER FROM THE BUFFER
   195 00000C7B E847010000          <1> 	call	_KIO_S_XLAT		; ROUTINE TO XLATE FOR STANDARD CALLS
   196 00000C80 72F4                <1> 	jc	short _K1		; CARRY SET MEANS TROW CODE AWAY
   197                              <1> _K1A:
   198 00000C82 EBE2                <1> 	jmp	short _KIO_EXIT         ; RETURN TO CALLER
   199                              <1> 
   200                              <1> 	;-----	ASCII STATUS
   201                              <1> _K2E:	
   202 00000C84 E804010000          <1> 	call	_K2S			; TEST FOR CHARACTER IN BUFFER (EXTENDED)
   203 00000C89 7420                <1> 	jz	short _K2B		; RETURN IF BUFFER EMPTY
   204 00000C8B 9C                  <1> 	pushf				; SAVE ZF FROM TEST
   205 00000C8C E82B010000          <1> 	call	_KIO_E_XLAT		; ROUTINE TO XLATE FOR EXTENDED CALLS
   206 00000C91 EB17                <1> 	jmp	short _K2A	        ; GIVE IT TO THE CALLER
   207                              <1> _K2:	
   208 00000C93 E8F5000000          <1> 	call	_K2S			; TEST FOR CHARACTER IN BUFFER
   209 00000C98 7411                <1> 	jz	short _K2B		; RETURN IF BUFFER EMPTY
   210 00000C9A 9C                  <1> 	pushf				; SAVE ZF FROM TEST
   211 00000C9B E827010000          <1> 	call	_KIO_S_XLAT		; ROUTINE TO XLATE FOR STANDARD CALLS
   212 00000CA0 7308                <1> 	jnc	short _K2A	        ; CARRY CLEAR MEANS PASS VALID CODE
   213 00000CA2 9D                  <1> 	popf				; INVALID CODE FOR THIS TYPE OF CALL
   214 00000CA3 E89A000000          <1> 	call	_K1S			; THROW THE CHARACTER AWAY
   215 00000CA8 EBE9                <1> 	jmp	short _K2		; GO LOOK FOR NEXT CHAR, IF ANY
   216                              <1> _K2A:
   217 00000CAA 9D                  <1> 	popf				; RESTORE ZF FROM TEST
   218                              <1> _K2B:
   219                              <1> 	; 02/01/2017
   220 00000CAB FA                  <1> 	cli
   221                              <1> 	;; mov	byte [intflg], 0 ;; 15/01/2017
   222                              <1> 	;
   223                              <1> 	;pop	ecx			; RECOVER REGISTER
   224 00000CAC 5B                  <1> 	pop	ebx			; RECOVER REGISTER
   225 00000CAD 1F                  <1> 	pop	ds			; RECOVER SEGMENT
   226                              <1> 	; (*) 29/05/2016
   227                              <1> 	; (*) retf 4			; THROW AWAY (e)FLAGS
   228 00000CAE 7208                <1> 	jc	short _k2d
   229 00000CB0 7505                <1> 	jnz	short _k2c
   230 00000CB2 804C240840          <1> 	or	byte [esp+8], 01000000b	; set zero flag bit of eflags register
   231                              <1> _k2c:
   232 00000CB7 CF                  <1> 	iretd
   233                              <1> _k2d:
   234                              <1> 	; 29/05/2016 -set carry flag on stack-
   235                              <1> 	; [esp] = EIP
   236                              <1> 	; [esp+4] = CS
   237                              <1> 	; [esp+8] = E-FLAGS
   238 00000CB8 804C240801          <1> 	or	byte [esp+8], 1  ; set carry bit of eflags register
   239                              <1> 	; [esp+12] = ESP (user)
   240                              <1> 	; [esp+16] = SS (User)
   241 00000CBD CF                  <1> 	iretd
   242                              <1> 
   243                              <1> 	
   244                              <1> 	; (*) 29/05/2016 - 'ref 4' intruction causes to stack fault
   245                              <1> 	; (OUTER-PRIVILEGE-LEVEL)
   246                              <1> 	; INTEL 80386 PROGRAMMER'S REFERENCE MANUAL 1986
   247                              <1> 	; // RETF instruction:
   248                              <1> 	;
   249                              <1> 	; IF OperandMode=32 THEN
   250                              <1>  	;    Load CS:EIP from stack;
   251                              <1>  	;    Set CS RPL to CPL;
   252                              <1>  	;    Increment eSP by 8 plus the immediate offset if it exists;
   253                              <1>  	;    Load SS:eSP from stack;
   254                              <1>  	; ELSE (* OperandMode=16 *)
   255                              <1>  	;    Load CS:IP from stack;
   256                              <1>  	;    Set CS RPL to CPL;
   257                              <1>  	;    Increment eSP by 4 plus the immediate offset if it exists;
   258                              <1> 	;    Load SS:eSP from stack;
   259                              <1>  	; FI;
   260                              <1> 	;
   261                              <1> 	; //
   262                              <1> 
   263                              <1> 	;-----	SHIFT STATUS
   264                              <1> _K3E:                                   ; GET THE EXTENDED SHIFT STATUS FLAGS
   265 00000CBE 8A25[EE5E0000]      <1> 	mov	ah, [KB_FLAG_1]		; GET SYSTEM SHIFT KEY STATUS
   266 00000CC4 80E404              <1> 	and	ah, SYS_SHIFT		; MASK ALL BUT SYS KEY BIT
   267                              <1> 	;mov	cl, 5			; SHIFT THEW SYSTEMKEY BIT OVER TO
   268                              <1> 	;shl	ah, cl			; BIT 7 POSITION
   269 00000CC7 C0E405              <1>         shl	ah, 5
   270 00000CCA A0[EE5E0000]        <1> 	mov	al, [KB_FLAG_1]		; GET SYSTEM SHIFT STATES BACK
   271 00000CCF 2473                <1> 	and	al, 01110011b		; ELIMINATE SYS SHIFT, HOLD_STATE AND INS_SHIFT
   272 00000CD1 08C4                <1> 	or	ah, al                  ; MERGE REMAINING BITS INTO AH
   273 00000CD3 A0[F05E0000]        <1> 	mov	al, [KB_FLAG_3]		; GET RIGHT CTL AND ALT
   274 00000CD8 240C                <1> 	and	al, 00001100b		; ELIMINATE LC_E0 AND LC_E1
   275 00000CDA 08C4                <1> 	or	ah, al			; OR THE SHIFT FLAGS TOGETHER
   276                              <1> _K3:
   277 00000CDC A0[ED5E0000]        <1> 	mov	al, [KB_FLAG]		; GET THE SHIFT STATUS FLAGS
   278                              <1> 	;jmp	short _KIO_EXIT		; RETURN TO CALLER
   279 00000CE1 EB83                <1> 	jmp	_KIO_EXIT
   280                              <1> 
   281                              <1> 	;-----	SET TYPAMATIC RATE AND DELAY
   282                              <1> _K300:
   283 00000CE3 3C05                <1> 	cmp	al, 5			; CORRECT FUNCTION CALL?
   284                              <1> 	;jne	short _KIO_EXIT		; NO, RETURN
   285 00000CE5 0F857BFFFFFF        <1>      	jne	_KIO_EXIT
   286 00000CEB F6C3E0              <1> 	test	bl, 0E0h		; TEST FOR OUT-OF-RANGE RATE
   287 00000CEE 0F8572FFFFFF        <1>         jnz     _KIO_EXIT               ; RETURN IF SO
   288 00000CF4 F6C7FC              <1> 	test	BH, 0FCh		; TEST FOR OUT-OF-RANGE DELAY
   289 00000CF7 0F8569FFFFFF        <1>         jnz     _KIO_EXIT               ; RETURN IF SO
   290 00000CFD B0F3                <1> 	mov	al, KB_TYPA_RD		; COMMAND FOR TYPAMATIC RATE/DELAY		
   291 00000CFF E8DA060000          <1> 	call	SND_DATA		; SEND TO KEYBOARD	
   292                              <1> 	;mov	cx, 5			; SHIFT COUNT
   293                              <1> 	;shl	bh, cl			; SHIFT DELAY OVER
   294 00000D04 C0E705              <1> 	shl	bh, 5
   295 00000D07 88D8                <1> 	mov	al, bl			; PUT IN RATE
   296 00000D09 08F8                <1> 	or	al, bh			; AND DELAY
   297 00000D0B E8CE060000          <1> 	call	SND_DATA		; SEND TO KEYBOARD	
   298 00000D10 E951FFFFFF          <1>         jmp     _KIO_EXIT               ; RETURN TO CALLER
   299                              <1> 
   300                              <1> 	;-----	WRITE TO KEYBOARD BUFFER
   301                              <1> _K500:
   302 00000D15 56                  <1> 	push	esi			; SAVE SI (esi)
   303 00000D16 FA                  <1> 	cli				; 
   304 00000D17 8B1D[FE5E0000]      <1>      	mov	ebx, [BUFFER_TAIL]	; GET THE 'IN TO' POINTER TO THE BUFFER
   305 00000D1D 89DE                <1> 	mov	esi, ebx		; SAVE A COPY IN CASE BUFFER NOT FULL
   306 00000D1F E8D3000000          <1> 	call	_K4			; BUMP THE POINTER TO SEE IF BUFFER IS FULL
   307 00000D24 3B1D[FA5E0000]      <1> 	cmp	ebx, [BUFFER_HEAD]	; WILL THE BUFFER OVERRUN IF WE STORE THIS?
   308 00000D2A 740D                <1> 	je	short _K502		; YES - INFORM CALLER OF ERROR		
   309 00000D2C 66890E              <1> 	mov	[esi], cx		; NO - PUT ASCII/SCAN CODE INTO BUFFER	
   310 00000D2F 891D[FE5E0000]      <1> 	mov	[BUFFER_TAIL], ebx	; ADJUST 'IN TO' POINTER TO REFLECT CHANGE
   311 00000D35 28C0                <1> 	sub	al, al			; TELL CALLER THAT OPERATION WAS SUCCESSFUL
   312 00000D37 EB02                <1> 	jmp	short _K504		; SUB INSTRUCTION ALSO RESETS CARRY FLAG
   313                              <1> _K502:
   314 00000D39 B001                <1> 	mov	al, 01h			; BUFFER FULL INDICATION
   315                              <1> _K504:
   316 00000D3B FB                  <1> 	sti				
   317 00000D3C 5E                  <1> 	pop	esi			; RECOVER SI (esi)
   318 00000D3D E924FFFFFF          <1>         jmp     _KIO_EXIT               ; RETURN TO CALLER WITH STATUS IN AL
   319                              <1> 
   320                              <1> 	;-----	READ THE KEY TO FIGURE OUT WHAT TO DO -----
   321                              <1> _K1S:
   322 00000D42 FA                  <1> 	cli	; 03/12/2014
   323 00000D43 8B1D[FA5E0000]      <1>         mov     ebx, [BUFFER_HEAD] 	; GET POINTER TO HEAD OF BUFFER
   324 00000D49 3B1D[FE5E0000]      <1>         cmp     ebx, [BUFFER_TAIL] 	; TEST END OF BUFFER
   325                              <1> 	;jne	short _K1U		; IF ANYTHING IN BUFFER SKIP INTERRUPT
   326 00000D4F 750F                <1> 	jne	short _k1x ; 03/12/2014
   327                              <1> 	;
   328                              <1> 	; 03/12/2014
   329                              <1> 	; 28/08/2014
   330                              <1> 	; PERFORM OTHER FUNCTION ?? here !
   331                              <1> 	;; MOV	AX, 9002h		; MOVE IN WAIT CODE & TYPE
   332                              <1> 	;; INT 	15H			; PERFORM OTHER FUNCTION
   333                              <1> _K1T:                                   ; ASCII READ
   334 00000D51 FB                  <1> 	sti				; INTERRUPTS BACK ON DURING LOOP
   335 00000D52 90                  <1> 	nop				; ALLOW AN INTERRUPT TO OCCUR
   336                              <1> _K1U:	
   337 00000D53 FA                  <1> 	cli				; INTERRUPTS BACK OFF
   338 00000D54 8B1D[FA5E0000]      <1>         mov    	ebx, [BUFFER_HEAD] 	; GET POINTER TO HEAD OF BUFFER
   339 00000D5A 3B1D[FE5E0000]      <1>         cmp     ebx, [BUFFER_TAIL] 	; TEST END OF BUFFER
   340                              <1> _k1x:
   341 00000D60 53                  <1> 	push	ebx			; SAVE ADDRESS		
   342 00000D61 9C                  <1> 	pushf				; SAVE FLAGS
   343 00000D62 E82F070000          <1> 	call	MAKE_LED		; GO GET MODE INDICATOR DATA BYTE
   344 00000D67 8A1D[EF5E0000]      <1> 	mov	bl, [KB_FLAG_2] 	; GET PREVIOUS BITS
   345 00000D6D 30C3                <1> 	xor	bl, al			; SEE IF ANY DIFFERENT
   346 00000D6F 80E307              <1> 	and	bl, 07h	; KB_LEDS	; ISOLATE INDICATOR BITS
   347 00000D72 7406                <1> 	jz	short _K1V		; IF NO CHANGE BYPASS UPDATE
   348 00000D74 E8C9060000          <1> 	call	SND_LED1
   349 00000D79 FA                  <1> 	cli				; DISABLE INTERRUPTS
   350                              <1> _K1V:
   351 00000D7A 9D                  <1> 	popf				; RESTORE FLAGS
   352 00000D7B 5B                  <1> 	pop	ebx			; RESTORE ADDRESS
   353 00000D7C 74D3                <1>         je      short _K1T              ; LOOP UNTIL SOMETHING IN BUFFER
   354                              <1> 	;
   355 00000D7E 668B03              <1> 	mov	ax, [ebx] 		; GET SCAN CODE AND ASCII CODE
   356 00000D81 E871000000          <1>         call    _K4                     ; MOVE POINTER TO NEXT POSITION
   357 00000D86 891D[FA5E0000]      <1>         mov     [BUFFER_HEAD], ebx      ; STORE VALUE IN VARIABLE
   358 00000D8C C3                  <1> 	retn				; RETURN
   359                              <1> 
   360                              <1> 	;-----	READ THE KEY TO SEE IF ONE IS PRESENT -----
   361                              <1> _K2S:
   362 00000D8D FA                  <1> 	cli				; INTERRUPTS OFF
   363 00000D8E 8B1D[FA5E0000]      <1>         mov     ebx, [BUFFER_HEAD]      ; GET HEAD POINTER
   364 00000D94 3B1D[FE5E0000]      <1>         cmp     ebx, [BUFFER_TAIL]      ; IF EQUAL (Z=1) THEN NOTHING THERE
   365 00000D9A 668B03              <1> 	mov	ax, [ebx]
   366 00000D9D 9C                  <1> 	pushf				; SAVE FLAGS
   367 00000D9E 6650                <1> 	push	ax			; SAVE CODE
   368 00000DA0 E8F1060000          <1> 	call	MAKE_LED		; GO GET MODE INDICATOR DATA BYTE
   369 00000DA5 8A1D[EF5E0000]      <1> 	mov	bl, [KB_FLAG_2] 	; GET PREVIOUS BITS
   370 00000DAB 30C3                <1> 	xor	bl, al			; SEE IF ANY DIFFERENT
   371 00000DAD 80E307              <1> 	and	bl, 07h ; KB_LEDS	; ISOLATE INDICATOR BITS
   372 00000DB0 7405                <1> 	jz	short _K2T		; IF NO CHANGE BYPASS UPDATE
   373 00000DB2 E874060000          <1> 	call	SND_LED			; GO TURN ON MODE INDICATORS
   374                              <1> _K2T:
   375 00000DB7 6658                <1> 	pop	ax			; RESTORE CODE
   376 00000DB9 9D                  <1> 	popf				; RESTORE FLAGS
   377 00000DBA FB                  <1> 	sti				; INTERRUPTS BACK ON
   378 00000DBB C3                  <1> 	retn				; RETURN
   379                              <1> 
   380                              <1> 	;-----	ROUTINE TO TRANSLATE SCAN CODE PAIRS FOR EXTENDED CALLS -----
   381                              <1> _KIO_E_XLAT:
   382 00000DBC 3CF0                <1> 	cmp	al, 0F0h		; IS IT ONE OF THE FILL-INs?
   383 00000DBE 7506                <1> 	jne	short _KIO_E_RET	; NO, PASS IT ON
   384 00000DC0 08E4                <1>         or 	ah, ah			; AH = 0 IS SPECIAL CASE
   385 00000DC2 7402                <1>         jz	short _KIO_E_RET        ; PASS THIS ON UNCHANGED
   386 00000DC4 30C0                <1> 	xor	al, al			; OTHERWISE SET AL = 0
   387                              <1> _KIO_E_RET:				
   388 00000DC6 C3                  <1> 	retn				; GO BACK
   389                              <1> 
   390                              <1> 	;-----	ROUTINE TO TRANSLATE SCAN CODE PAIRS FOR STANDARD CALLS -----
   391                              <1> _KIO_S_XLAT:
   392 00000DC7 80FCE0              <1> 	cmp	ah, 0E0h		; IS IT KEYPAD ENTER OR / ?
   393 00000DCA 750F                <1> 	jne	short _KIO_S2		; NO, CONTINUE
   394 00000DCC 3C0D                <1> 	cmp	al, 0Dh			; KEYPAD ENTER CODE?
   395 00000DCE 7408                <1>         je	short _KIO_S1		; YES, MASSAGE A BIT
   396 00000DD0 3C0A                <1> 	cmp	al, 0Ah			; CTRL KEYPAD ENTER CODE?
   397 00000DD2 7404                <1>         je	short _KIO_S1		; YES, MASSAGE THE SAME
   398 00000DD4 B435                <1> 	mov	ah, 35h			; NO, MUST BE KEYPAD /
   399                              <1> _kio_ret: ; 03/12/2014
   400 00000DD6 F8                  <1> 	clc
   401 00000DD7 C3                  <1> 	retn
   402                              <1> 	;jmp	short _KIO_USE		; GIVE TO CALLER
   403                              <1> _KIO_S1:				
   404 00000DD8 B41C                <1> 	mov	ah, 1Ch			; CONVERT TO COMPATIBLE OUTPUT
   405                              <1> 	;jmp	short _KIO_USE		; GIVE TO CALLER
   406 00000DDA C3                  <1> 	retn
   407                              <1> _KIO_S2:		
   408 00000DDB 80FC84              <1> 	cmp	ah, 84h			; IS IT ONE OF EXTENDED ONES?
   409 00000DDE 7715                <1> 	ja	short _KIO_DIS		; YES, THROW AWAY AND GET ANOTHER CHAR
   410 00000DE0 3CF0                <1> 	cmp	al, 0F0h		; IS IT ONE OF THE FILL-INs?
   411 00000DE2 7506                <1>         jne	short _KIO_S3		; NO, TRY LAST TEST
   412 00000DE4 08E4                <1> 	or	ah, ah			; AH = 0 IS SPECIAL CASE
   413 00000DE6 740C                <1>         jz	short _KIO_USE		; PASS THIS ON UNCHANGED
   414 00000DE8 EB0B                <1> 	jmp	short _KIO_DIS		; THROW AWAY THE REST
   415                              <1> _KIO_S3:
   416 00000DEA 3CE0                <1> 	cmp	al, 0E0h		; IS IT AN EXTENSION OF A PREVIOUS ONE?
   417                              <1> 	;jne	short _KIO_USE		; NO, MUST BE A STANDARD CODE
   418 00000DEC 75E8                <1> 	jne	short _kio_ret
   419 00000DEE 08E4                <1> 	or	ah, ah			; AH = 0 IS SPECIAL CASE
   420 00000DF0 7402                <1>         jz	short _KIO_USE		; JUMP IF AH = 0
   421 00000DF2 30C0                <1> 	xor	al, al			; CONVERT TO COMPATIBLE OUTPUT
   422                              <1> 	;jmp	short _KIO_USE		; PASS IT ON TO CALLER
   423                              <1> _KIO_USE:
   424                              <1> 	;clc				; CLEAR CARRY TO INDICATE GOOD CODE
   425 00000DF4 C3                  <1> 	retn				; RETURN	
   426                              <1> _KIO_DIS:
   427 00000DF5 F9                  <1> 	stc				; SET CARRY TO INDICATE DISCARD CODE
   428 00000DF6 C3                  <1> 	retn				; RETURN
   429                              <1> 
   430                              <1> 	;-----	INCREMENT BUFFER POINTER ROUTINE -----
   431                              <1> _K4:    
   432 00000DF7 43                  <1> 	inc     ebx
   433 00000DF8 43                  <1> 	inc	ebx			; MOVE TO NEXT WORD IN LIST
   434 00000DF9 3B1D[F65E0000]      <1>         cmp     ebx, [BUFFER_END] 	; AT END OF BUFFER?
   435                              <1>         ;jne    short _K5               ; NO, CONTINUE
   436 00000DFF 7206                <1> 	jb	short _K5
   437 00000E01 8B1D[F25E0000]      <1>         mov     ebx, [BUFFER_START]     ; YES, RESET TO BUFFER BEGINNING
   438                              <1> _K5:
   439 00000E07 C3                  <1> 	retn
   440                              <1> 
   441                              <1> ; 20/02/2015
   442                              <1> ; 05/12/2014
   443                              <1> ; 26/08/2014
   444                              <1> ; KEYBOARD (HARDWARE) INTERRUPT -  IRQ LEVEL 1
   445                              <1> ; (INT_09h - Retro UNIX 8086 v1 - U9.ASM, 07/03/2014)
   446                              <1> ;
   447                              <1> ; Derived from "KB_INT_1" procedure of IBM "pc-at" 
   448                              <1> ; rombios source code (06/10/1985)
   449                              <1> ; 'keybd.asm', HARDWARE INT 09h - (IRQ Level 1)
   450                              <1> 
   451                              <1> ; EQUATES (IBM PC-XT-286 BIOS, 1986, 'POSQEQU.INC')
   452                              <1> 
   453                              <1> ;--------- 8042 COMMANDS -------------------------------------------------------
   454                              <1> ENA_KBD		equ	0AEh		; ENABLE KEYBOARD COMMAND
   455                              <1> DIS_KBD		equ	0ADh		; DISABLE KEYBOARD COMMAND
   456                              <1> SHUT_CMD	equ	0FEh		; CAUSE A SHUTDOWN COMMAND
   457                              <1> ;--------- 8042 KEYBOARD INTERFACE AND DIAGNOSTIC CONTROL REGISTERS ------------
   458                              <1> STATUS_PORT	equ	064h		; 8042 STATUS PORT
   459                              <1> INPT_BUF_FULL	equ	00000010b 	; 1 = +INPUT BUFFER FULL
   460                              <1> PORT_A		equ	060h		; 8042 KEYBOARD SCAN CODE/CONTROL PORT
   461                              <1> ;---------- 8042 KEYBOARD RESPONSE ---------------------------------------------
   462                              <1> KB_ACK		equ	0FAh		; ACKNOWLEDGE PROM TRANSMISSION
   463                              <1> KB_RESEND	equ	0FEh		; RESEND REQUEST
   464                              <1> KB_OVER_RUN	equ	0FFh		; OVER RUN SCAN CODE
   465                              <1> ;---------- KEYBOARD/LED COMMANDS ----------------------------------------------
   466                              <1> KB_ENABLE	equ	0F4h		; KEYBOARD ENABLE
   467                              <1> LED_CMD		equ	0EDh		; LED WRITE COMMAND
   468                              <1> KB_TYPA_RD	equ	0F3h		; TYPAMATIC RATE/DELAY COMMAND
   469                              <1> ;---------- KEYBOARD SCAN CODES ------------------------------------------------
   470                              <1> NUM_KEY		equ	69		; SCAN CODE FOR	 NUMBER LOCK KEY
   471                              <1> SCROLL_KEY	equ	70		; SCAN CODE FOR	 SCROLL LOCK KEY
   472                              <1> ALT_KEY		equ	56		; SCAN CODE FOR	 ALTERNATE SHIFT KEY
   473                              <1> CTL_KEY		equ	29		; SCAN CODE FOR	 CONTROL KEY
   474                              <1> CAPS_KEY	equ	58		; SCAN CODE FOR	 SHIFT LOCK KEY
   475                              <1> DEL_KEY		equ	83		; SCAN CODE FOR	 DELETE KEY
   476                              <1> INS_KEY		equ	82		; SCAN CODE FOR	 INSERT KEY
   477                              <1> LEFT_KEY	equ	42		; SCAN CODE FOR	 LEFT SHIFT
   478                              <1> RIGHT_KEY	equ	54		; SCAN CODE FOR	 RIGHT SHIFT
   479                              <1> SYS_KEY		equ	84		; SCAN CODE FOR	 SYSTEM KEY
   480                              <1> ;---------- ENHANCED KEYBOARD SCAN CODES ---------------------------------------
   481                              <1> ID_1		equ	0ABh		; 1ST ID CHARACTER FOR KBX
   482                              <1> ID_2		equ	041h		; 2ND ID CHARACTER FOR KBX
   483                              <1> ID_2A		equ	054h		; ALTERNATE 2ND ID CHARACTER FOR KBX
   484                              <1> F11_M		equ	87		; F11 KEY MAKE
   485                              <1> F12_M		equ	88		; F12 KEY MAKE
   486                              <1> MC_E0		equ	224		; GENERAL MARKER CODE
   487                              <1> MC_E1		equ	225		; PAUSE KEY MARKER CODE
   488                              <1> ;---------- FLAG EQUATES WITHIN @KB_FLAG----------------------------------------
   489                              <1> RIGHT_SHIFT	equ	00000001b	; RIGHT SHIFT KEY DEPRESSED
   490                              <1> LEFT_SHIFT	equ	00000010b	; LEFT SHIFT KEY DEPRESSED
   491                              <1> CTL_SHIFT	equ	00000100b	; CONTROL SHIFT KEY DEPRESSED
   492                              <1> ALT_SHIFT	equ	00001000b	; ALTERNATE SHIFT KEY DEPRESSED
   493                              <1> SCROLL_STATE	equ	00010000b	; SCROLL LOCK STATE IS ACTIVE
   494                              <1> NUM_STATE	equ	00100000b	; NUM LOCK STATE IS ACTIVE
   495                              <1> CAPS_STATE	equ	01000000b	; CAPS LOCK STATE IS ACTIVE
   496                              <1> INS_STATE	equ	10000000b	; INSERT STATE IS ACTIVE
   497                              <1> ;---------- FLAG EQUATES WITHIN	@KB_FLAG_1 -------------------------------------
   498                              <1> L_CTL_SHIFT	equ	00000001b	; LEFT CTL KEY DOWN
   499                              <1> L_ALT_SHIFT	equ	00000010b	; LEFT ALT KEY DOWN
   500                              <1> SYS_SHIFT	equ	00000100b	; SYSTEM KEY DEPRESSED AND HELD
   501                              <1> HOLD_STATE	equ	00001000b	; SUSPEND KEY HAS BEEN TOGGLED
   502                              <1> SCROLL_SHIFT	equ	00010000b	; SCROLL LOCK KEY IS DEPRESSED
   503                              <1> NUM_SHIFT	equ	00100000b	; NUM LOCK KEY IS DEPRESSED
   504                              <1> CAPS_SHIFT	equ	01000000b	; CAPS LOCK KEY IS DEPRE55ED
   505                              <1> INS_SHIFT	equ	10000000b	; INSERT KEY IS DEPRESSED
   506                              <1> ;---------- FLAGS EQUATES WITHIN @KB_FLAG_2 -----------------------------------
   507                              <1> KB_LEDS		equ	00000111b	; KEYBOARD LED STATE BITS
   508                              <1> ;		equ	00000001b	; SCROLL LOCK INDICATOR
   509                              <1> ;		equ	00000010b	; NUM LOCK INDICATOR
   510                              <1> ;		equ	00000100b	; CAPS LOCK INDICATOR
   511                              <1> ;		equ	00001000b	; RESERVED (MUST BE ZERO)
   512                              <1> KB_FA		equ	00010000b	; ACKNOWLEDGMENT RECEIVED
   513                              <1> KB_FE		equ	00100000b	; RESEND RECEIVED FLAG
   514                              <1> KB_PR_LED	equ	01000000b	; MODE INDICATOR UPDATE
   515                              <1> KB_ERR		equ	10000000b	; KEYBOARD TRANSMIT ERROR FLAG
   516                              <1> ;----------- FLAGS EQUATES WITHIN @KB_FLAG_3 -----------------------------------
   517                              <1> LC_E1		equ	00000001b	; LAST CODE WAS THE E1 HIDDEN CODE
   518                              <1> LC_E0		equ	00000010b	; LAST CODE WAS THE E0 HIDDEN CODE
   519                              <1> R_CTL_SHIFT	equ	00000100b	; RIGHT CTL KEY DOWN
   520                              <1> R_ALT_SHIFT	equ	00001000b	; RIGHT ALT KEY DOWN
   521                              <1> GRAPH_ON	equ	00001000b	; ALT GRAPHICS KEY DOWN (WT ONLY)	
   522                              <1> KBX		equ	00010000b	; ENHANCED KEYBOARD INSTALLED
   523                              <1> SET_NUM_LK	equ	00100000b	; FORCE NUM LOCK IF READ ID AND KBX
   524                              <1> LC_AB		equ	01000000b	; LAST CHARACTER WAS FIRST ID CHARACTER
   525                              <1> RD_ID		equ	10000000b	; DOING A READ ID (MUST BE BIT0)
   526                              <1> ;
   527                              <1> ;----------- INTERRUPT EQUATES -------------------------------------------------
   528                              <1> EOI		equ	020h		; END OF INTERRUPT COMMAND TO 8259
   529                              <1> INTA00		equ	020h		; 8259 PORT
   530                              <1> 
   531                              <1> 
   532                              <1> kb_int:
   533                              <1> 
   534                              <1> ; 17/10/2015 ('ctrlbrk') 
   535                              <1> ; 05/12/2014
   536                              <1> ; 04/12/2014 (derived from pc-xt-286 bios source code -1986-)
   537                              <1> ; 26/08/2014
   538                              <1> ;
   539                              <1> ; 03/06/86  KEYBOARD BIOS
   540                              <1> ;
   541                              <1> ;--- HARDWARE INT 09H -- (IRQ LEVEL 1) ------------------------------------------
   542                              <1> ;										;
   543                              <1> ;	KEYBOARD INTERRUPT ROUTINE						;
   544                              <1> ;										;
   545                              <1> ;--------------------------------------------------------------------------------
   546                              <1> 
   547                              <1> KB_INT_1:
   548 00000E08 FB                  <1> 	sti				; ENABLE INTERRUPTS
   549                              <1> 	;push	ebp
   550 00000E09 50                  <1> 	push	eax
   551 00000E0A 53                  <1> 	push	ebx
   552 00000E0B 51                  <1> 	push	ecx
   553 00000E0C 52                  <1> 	push	edx
   554 00000E0D 56                  <1> 	push	esi
   555 00000E0E 57                  <1> 	push	edi
   556 00000E0F 1E                  <1> 	push	ds
   557 00000E10 06                  <1> 	push	es
   558 00000E11 FC                  <1> 	cld				; FORWARD DIRECTION
   559 00000E12 66B81000            <1> 	mov	ax, KDATA
   560 00000E16 8ED8                <1> 	mov	ds, ax
   561 00000E18 8EC0                <1> 	mov	es, ax
   562                              <1> 	;
   563                              <1> 	;-----	WAIT FOR KEYBOARD DISABLE COMMAND TO BE ACCEPTED
   564 00000E1A B0AD                <1> 	mov	al, DIS_KBD		; DISABLE THE KEYBOARD COMMAND
   565 00000E1C E8A9050000          <1> 	call	SHIP_IT			; EXECUTE DISABLE
   566 00000E21 FA                  <1> 	cli				; DISABLE INTERRUPTS
   567 00000E22 B900000100          <1> 	mov	ecx, 10000h		; SET MAXIMUM TIMEOUT
   568                              <1> KB_INT_01:
   569 00000E27 E464                <1> 	in	al, STATUS_PORT		; READ ADAPTER STATUS
   570 00000E29 A802                <1> 	test	al, INPT_BUF_FULL	; CHECK INPUT BUFFER FULL STATUS BIT
   571 00000E2B E0FA                <1> 	loopnz	KB_INT_01		; WAIT FOR COMMAND TO BE ACCEPTED
   572                              <1> 	;
   573                              <1> 	;-----	READ CHARACTER FROM KEYBOARD INTERFACE
   574 00000E2D E460                <1> 	in	al, PORT_A		; READ IN THE CHARACTER
   575                              <1> 	;
   576                              <1> 	;-----	SYSTEM HOOK INT 15H - FUNCTION 4FH (ON HARDWARE INT LEVEL 9H) 	
   577                              <1> 	;MOV	AH, 04FH		; SYSTEM INTERCEPT - KEY CODE FUNCTION
   578                              <1> 	;STC				; SET CY=1 (IN CASE OF IRET)
   579                              <1> 	;INT	15H			; CASETTE CALL (AL)=KEY SCAN CODE
   580                              <1> 	;				; RETURNS CY=1 FOR INVALID FUNCTION
   581                              <1> 	;JC	KB_INT_02		; CONTINUE IF CARRY FLAG SET ((AL)=CODE)
   582                              <1> 	;JMP	K26			; EXIT IF SYSTEM HANDLES SCAN CODE
   583                              <1> 	;				; EXT HANDLES HARDWARE EOI AND ENABLE		
   584                              <1> 	;
   585                              <1> 	;-----	CHECK FOR A RESEND COMMAND TO KEYBOARD
   586                              <1> KB_INT_02:				; 	  (AL)= SCAN CODE
   587 00000E2F FB                  <1> 	sti				; ENABLE INTERRUPTS AGAIN
   588 00000E30 3CFE                <1> 	cmp	al, KB_RESEND		; IS THE INPUT A RESEND
   589 00000E32 7411                <1>         je      short KB_INT_4          ; GO IF RESEND
   590                              <1> 	;
   591                              <1> 	;-----	CHECK FOR RESPONSE TO A COMMAND TO KEYBOARD
   592 00000E34 3CFA                <1> 	cmp	al, KB_ACK		; IS THE INPUT AN ACKNOWLEDGE
   593 00000E36 751A                <1>         jne     short KB_INT_2          ; GO IF NOT
   594                              <1> 	;
   595                              <1> 	;-----	A COMMAND TO THE KEYBOARD WAS ISSUED
   596 00000E38 FA                  <1> 	cli				; DISABLE INTERRUPTS
   597 00000E39 800D[EF5E0000]10    <1> 	or	byte [KB_FLAG_2], KB_FA ; INDICATE ACK RECEIVED
   598 00000E40 E97A020000          <1>         jmp     K26                     ; RETURN IF NOT (ACK RETURNED FOR DATA)
   599                              <1> 	;
   600                              <1> 	;-----	RESEND THE LAST BYTE
   601                              <1> KB_INT_4:
   602 00000E45 FA                  <1> 	cli				; DISABLE INTERRUPTS
   603 00000E46 800D[EF5E0000]20    <1> 	or	byte [KB_FLAG_2], KB_FE ; INDICATE RESEND RECEIVED
   604 00000E4D E96D020000          <1>         jmp     K26                     ; RETURN IF NOT ACK RETURNED FOR DATA)
   605                              <1> 	;
   606                              <1> ;-----	UPDATE MODE INDICATORS IF CHANGE IN STATE
   607                              <1> KB_INT_2:
   608 00000E52 6650                <1> 	push 	ax			; SAVE DATA IN
   609 00000E54 E83D060000          <1> 	call	MAKE_LED		; GO GET MODE INDICATOR DATA BYTE
   610 00000E59 8A1D[EF5E0000]      <1> 	mov	bl, [KB_FLAG_2] 	; GET PREVIOUS BITS
   611 00000E5F 30C3                <1> 	xor	bl, al			; SEE IF ANY DIFFERENT
   612 00000E61 80E307              <1> 	and	bl, KB_LEDS		; ISOLATE INDICATOR BITS
   613 00000E64 7405                <1> 	jz	short UP0		; IF NO CHANGE BYPASS UPDATE
   614 00000E66 E8C0050000          <1> 	call	SND_LED			; GO TURN ON MODE INDICATORS
   615                              <1> UP0:
   616 00000E6B 6658                <1> 	pop	ax			; RESTORE DATA IN
   617                              <1> ;------------------------------------------------------------------------
   618                              <1> ;	START OF KEY PROCESSING						;
   619                              <1> ;------------------------------------------------------------------------
   620 00000E6D 88C4                <1> 	mov	ah, al			; SAVE SCAN CODE IN AH ALSO
   621                              <1> 	;
   622                              <1> 	;-----	TEST FOR OVERRUN SCAN CODE FROM KEYBOARD
   623 00000E6F 3CFF                <1> 	cmp	al, KB_OVER_RUN		; IS THIS AN OVERRUN CHAR
   624 00000E71 0F843F050000        <1>         je      K62			; BUFFER_FULL_BEEP
   625                              <1> 	;
   626                              <1> K16:	
   627 00000E77 8A3D[F05E0000]      <1> 	mov	bh, [KB_FLAG_3]		; LOAD FLAGS FOR TESTING
   628                              <1> 	;
   629                              <1> 	;-----	TEST TO SEE IF A READ_ID IS IN PROGRESS
   630 00000E7D F6C7C0              <1> 	test 	bh, RD_ID+LC_AB 	; ARE WE DOING A READ ID?
   631 00000E80 7449                <1> 	jz	short NOT_ID		; CONTINUE IF NOT
   632 00000E82 7917                <1> 	jns	short TST_ID_2		; IS THE RD_ID FLAG ON?
   633 00000E84 3CAB                <1> 	cmp	al, ID_1		; IS THIS THE 1ST ID CHARACTER?
   634 00000E86 7507                <1> 	jne	short RST_RD_ID
   635 00000E88 800D[F05E0000]40    <1> 	or	byte [KB_FLAG_3], LC_AB ; INDICATE 1ST ID WAS OK
   636                              <1> RST_RD_ID:
   637 00000E8F 8025[F05E0000]7F    <1> 	and	byte [KB_FLAG_3], ~RD_ID ; RESET THE READ ID FLAG
   638                              <1>         ;jmp    short ID_EX		; AND EXIT
   639 00000E96 E924020000          <1> 	jmp	K26
   640                              <1> 	;
   641                              <1> TST_ID_2:
   642 00000E9B 8025[F05E0000]BF    <1> 	and	byte [KB_FLAG_3], ~LC_AB ; RESET FLAG
   643 00000EA2 3C54                <1> 	cmp	al, ID_2A		; IS THIS THE 2ND ID CHARACTER?
   644 00000EA4 7419                <1>         je	short KX_BIT		; JUMP IF SO
   645 00000EA6 3C41                <1> 	cmp	al, ID_2		; IS THIS THE 2ND ID CHARACTER?
   646                              <1>         ;jne	short ID_EX		; LEAVE IF NOT
   647 00000EA8 0F8511020000        <1> 	jne	K26
   648                              <1> 	;
   649                              <1> 	;-----	A READ ID SAID THAT IT WAS ENHANCED KEYBOARD
   650 00000EAE F6C720              <1> 	test	bh, SET_NUM_LK 		; SHOULD WE SET NUM LOCK?
   651 00000EB1 740C                <1>         jz      short KX_BIT		; EXIT IF NOT
   652 00000EB3 800D[ED5E0000]20    <1> 	or	byte [KB_FLAG], NUM_STATE ; FORCE NUM LOCK ON
   653 00000EBA E86C050000          <1> 	call	SND_LED			; GO SET THE NUM LOCK INDICATOR
   654                              <1> KX_BIT:
   655 00000EBF 800D[F05E0000]10    <1> 	or	byte [KB_FLAG_3], KBX	; INDICATE ENHANCED KEYBOARD WAS FOUND
   656 00000EC6 E9F4010000          <1> ID_EX:	jmp     K26			; EXIT
   657                              <1> 	;
   658                              <1> NOT_ID:
   659 00000ECB 3CE0                <1> 	cmp	al, MC_E0		; IS THIS THE GENERAL MARKER CODE?
   660 00000ECD 750C                <1> 	jne	short TEST_E1
   661 00000ECF 800D[F05E0000]12    <1> 	or	byte [KB_FLAG_3], LC_E0+KBX ; SET FLAG BIT, SET KBX, AND
   662                              <1> 	;jmp	short EXIT		; THROW AWAY THIS CODE
   663 00000ED6 E9EB010000          <1> 	jmp	K26A	
   664                              <1> TEST_E1:	
   665 00000EDB 3CE1                <1> 	cmp	al, MC_E1		; IS THIS THE PAUSE KEY?
   666 00000EDD 750C                <1> 	jne	short NOT_HC
   667 00000EDF 800D[F05E0000]11    <1> 	or	byte [KB_FLAG_3], LC_E1+KBX ; SET FLAG BIT, SET KBX, AND
   668 00000EE6 E9DB010000          <1> EXIT:	jmp	K26A			; THROW AWAY THIS CODE
   669                              <1> 	;
   670                              <1> NOT_HC:
   671 00000EEB 247F                <1> 	and	al, 07Fh		; TURN OFF THE BREAK BIT
   672 00000EED F6C702              <1> 	test	bh, LC_E0		; LAST CODE THE E0 MARKER CODE
   673 00000EF0 7414                <1> 	jz	short NOT_LC_E0		; JUMP IF NOT
   674                              <1> 	;
   675 00000EF2 BF[DA5D0000]        <1> 	mov	edi, _K6+6		; IS THIS A SHIFT KEY?
   676 00000EF7 AE                  <1> 	scasb
   677 00000EF8 0F84C1010000        <1>         je      K26 ; K16B              ; YES, THROW AWAY & RESET FLAG
   678 00000EFE AE                  <1> 	scasb
   679 00000EFF 757C                <1> 	jne	short K16A		; NO, CONTINUE KEY PROCESSING
   680                              <1> 	;jmp	short K16B		; YES, THROW AWAY & RESET FLAG
   681 00000F01 E9B9010000          <1> 	jmp	K26
   682                              <1> 	;
   683                              <1> NOT_LC_E0:
   684 00000F06 F6C701              <1> 	test	bh, LC_E1		; LAST CODE THE E1 MARKER CODE?
   685 00000F09 7435                <1> 	jz	short T_SYS_KEY		; JUMP IF NOT
   686 00000F0B B904000000          <1> 	mov	ecx, 4			; LENGHT OF SEARCH
   687 00000F10 BF[D85D0000]        <1> 	mov	edi, _K6+4		; IS THIS AN ALT, CTL, OR SHIFT?
   688 00000F15 F2AE                <1> 	repne	scasb			; CHECK IT
   689                              <1> 	;je	short EXIT		; THROW AWAY IF SO
   690 00000F17 0F84A9010000        <1> 	je	K26A			
   691                              <1> 	;
   692 00000F1D 3C45                <1> 	cmp	al, NUM_KEY		; IS IT THE PAUSE KEY?
   693                              <1> 	;jne	short K16B		; NO, THROW AWAY & RESET FLAG
   694 00000F1F 0F859A010000        <1> 	jne	K26
   695 00000F25 F6C480              <1> 	test	ah, 80h			; YES, IS IT THE BREAK OF THE KEY?
   696                              <1> 	;jnz	short K16B		; YES, THROW THIS AWAY, TOO	
   697 00000F28 0F8591010000        <1> 	jnz	K26
   698                              <1>         ; 20/02/2015 
   699 00000F2E F605[EE5E0000]08    <1> 	test	byte [KB_FLAG_1],HOLD_STATE ;  NO, ARE WE PAUSED ALREADY?
   700                              <1> 	;jnz	short K16B		;  YES, THROW AWAY
   701 00000F35 0F8584010000        <1> 	jnz	K26
   702 00000F3B E9E1020000          <1> 	jmp     K39P                    ; NO, THIS IS THE REAL PAUSE STATE
   703                              <1> 	;
   704                              <1> 	;-----	TEST FOR SYSTEM KEY
   705                              <1> T_SYS_KEY:
   706 00000F40 3C54                <1> 	cmp	al, SYS_KEY		; IS IT THE SYSTEM KEY?
   707 00000F42 7539                <1> 	jnz	short K16A		; CONTINUE IF NOT
   708                              <1> 	;
   709 00000F44 F6C480              <1> 	test	ah, 80h			; CHECK IF THIS A BREAK CODE
   710 00000F47 7524                <1> 	jnz	short K16C		; DO NOT TOUCH SYSTEM INDICATOR IF TRUE
   711                              <1> 	;
   712 00000F49 F605[EE5E0000]04    <1> 	test	byte [KB_FLAG_1], SYS_SHIFT ; SEE IF IN SYSTEM KEY HELD DOWN 
   713                              <1>         ;jnz	short K16B		; IF YES, DO NOT PROCESS SYSTEM INDICATOR	
   714 00000F50 0F8569010000        <1> 	jnz     K26			
   715                              <1> 	;
   716 00000F56 800D[EE5E0000]04    <1> 	or	byte [KB_FLAG_1], SYS_SHIFT ; INDICATE SYSTEM KEY DEPRESSED
   717 00000F5D B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
   718 00000F5F E620                <1> 	out	20h, al ;out INTA00, al	; SEND COMMAND TO INTERRUPT CONTROL PORT
   719                              <1> 					; INTERRUPT-RETURN-NO-EOI
   720 00000F61 B0AE                <1> 	mov	al, ENA_KBD		; INSURE KEYBOARD IS ENABLED
   721 00000F63 E862040000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
   722                              <1> 	; !!! SYSREQ !!! function/system call (INTERRUPT) must be here !!!
   723                              <1> 	;MOV	AL, 8500H		; FUNCTION VALUE FOR MAKE OF SYSTEM KEY
   724                              <1> 	;STI				; MAKE SURE INTERRUPTS ENABLED
   725                              <1> 	;INT	15H			; USER INTERRUPT	
   726 00000F68 E965010000          <1>         jmp     K27A                    ; END PROCESSING
   727                              <1> 	;
   728                              <1> ;K16B:	jmp	K26			; IGNORE SYSTEM KEY
   729                              <1> 	;
   730                              <1> K16C:
   731 00000F6D 8025[EE5E0000]FB    <1> 	and	byte [KB_FLAG_1], ~SYS_SHIFT ; TURN OFF SHIFT KEY HELD DOWN
   732 00000F74 B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
   733 00000F76 E620                <1> 	out	20h, al ;out INTA00, al ; SEND COMMAND TO INTERRUPT CONTROL PORT
   734                              <1> 					; INTERRUPT-RETURN-NO-EOI
   735                              <1> 	;MOV	AL, ENA_KBD		; INSURE KEYBOARD IS ENABLED
   736                              <1> 	;CALL	SHIP_IT			; EXECUTE ENABLE
   737                              <1> 	;
   738                              <1> 	;MOV	AX, 8501H		; FUNCTION VALUE FOR BREAK OF SYSTEM KEY
   739                              <1> 	;STI				; MAKE SURE INTERRUPTS ENABLED
   740                              <1> 	;INT	15H			; USER INTERRUPT
   741                              <1> 	;JMP	K27A			; INGONRE SYSTEM KEY				
   742                              <1> 	;
   743 00000F78 E94E010000          <1> 	jmp     K27			; IGNORE SYSTEM KEY
   744                              <1> 	;
   745                              <1> 	;-----	TEST FOR SHIFT KEYS
   746                              <1> K16A:
   747 00000F7D 8A1D[ED5E0000]      <1> 	mov	bl, [KB_FLAG]		; PUT STATE FLAGS IN BL
   748 00000F83 BF[D45D0000]        <1> 	mov	edi, _K6		; SHIFT KEY TABLE offset
   749 00000F88 B908000000          <1> 	mov	ecx, _K6L		; LENGTH
   750 00000F8D F2AE                <1> 	repne	scasb			; LOOK THROUGH THE TABLE FOR A MATCH
   751 00000F8F 88E0                <1> 	mov	al, ah			; RECOVER SCAN CODE
   752 00000F91 0F8510010000        <1>         jne     K25                     ; IF NO MATCH, THEN SHIFT NOT FOUND
   753                              <1> 	;
   754                              <1> 	;------	SHIFT KEY FOUND
   755                              <1> K17:
   756 00000F97 81EF[D55D0000]      <1>         sub     edi, _K6+1              ; ADJUST PTR TO SCAN CODE MATCH
   757 00000F9D 8AA7[DC5D0000]      <1>        	mov     ah, [edi+_K7]       	; GET MASK INTO AH
   758 00000FA3 B102                <1> 	mov	cl, 2			; SETUP COUNT FOR FLAG SHIFTS
   759 00000FA5 A880                <1> 	test	al, 80h			; TEST FOR BREAK KEY
   760 00000FA7 0F8596000000        <1>         jnz     K23                     ; JUMP OF BREAK
   761                              <1> 	;
   762                              <1> 	;-----	SHIFT MAKE FOUND, DETERMINE SET OR TOGGLE
   763                              <1> K17C:
   764 00000FAD 80FC10              <1> 	cmp	ah, SCROLL_SHIFT
   765 00000FB0 732B                <1> 	jae	short K18		; IF SCROLL SHIFT OR ABOVE, TOGGLE KEY
   766                              <1> 	;
   767                              <1> 	;-----	PLAIN SHIFT KEY, SET SHIFT ON
   768 00000FB2 0825[ED5E0000]      <1> 	or	[KB_FLAG], ah		; TURN ON SHIFT BIT
   769 00000FB8 A80C                <1>         test	al, CTL_SHIFT+ALT_SHIFT ; IS IT ALT OR CTRL?
   770                              <1> 	;jnz	short K17D		; YES, MORE FLAGS TO SET
   771 00000FBA 0F84FF000000        <1> 	jz	K26			; NO, INTERRUPT RETURN
   772                              <1> K17D:
   773 00000FC0 F6C702              <1> 	test	bh, LC_E0		; IS THIS ONE OF NEW KEYS?
   774 00000FC3 740B                <1> 	jz 	short K17E		; NO, JUMP
   775 00000FC5 0825[F05E0000]      <1> 	or	[KB_FLAG_3], ah		; SET BITS FOR RIGHT CTRL, ALT
   776 00000FCB E9EF000000          <1> 	jmp	K26			; INTERRUPT RETURN
   777                              <1> K17E:
   778 00000FD0 D2EC                <1> 	shr	ah, cl			; MOVE FLAG BITS TWO POSITIONS
   779 00000FD2 0825[EE5E0000]      <1> 	or	[KB_FLAG_1], ah		; SET BITS FOR LEFT CTRL, ALT
   780 00000FD8 E9E2000000          <1> 	jmp	K26
   781                              <1> 	;
   782                              <1> 	;-----	TOGGLED SHIFT KEY, TEST FOR 1ST MAKE OR NOT
   783                              <1> K18:					; SHIFT-TOGGLE
   784 00000FDD F6C304              <1> 	test	bl, CTL_SHIFT 		; CHECK CTL SHIFT STATE
   785                              <1>         ;jz    	short K18A              ; JUMP IF NOT CTL STATE
   786 00000FE0 0F85C1000000        <1>         jnz     K25                     ; JUMP IF CTL STATE
   787                              <1> K18A:
   788 00000FE6 3C52                <1> 	cmp	al, INS_KEY		; CHECK FOR INSERT KEY
   789 00000FE8 7524                <1> 	jne	short K22		; JUMP IF NOT INSERT KEY
   790 00000FEA F6C308              <1> 	test	bl, ALT_SHIFT 		; CHECK FOR ALTERNATE SHIFT
   791                              <1>       	;jz	short K18B		; JUMP IF NOT ALTERNATE SHIFT	
   792 00000FED 0F85B4000000        <1>         jnz     K25                     ; JUMP IF ALTERNATE SHIFT
   793                              <1> K18B:
   794 00000FF3 F6C702              <1> 	test	bh, LC_E0 ;20/02/2015	; IS THIS NEW INSERT KEY?
   795 00000FF6 7516                <1> 	jnz	short K22		; YES, THIS ONE'S NEVER A '0'
   796                              <1> K19:	
   797 00000FF8 F6C320              <1> 	test	bl, NUM_STATE 		; CHECK FOR BASE STATE
   798 00000FFB 750C                <1> 	jnz	short K21		; JUMP IF NUM LOCK IS ON
   799 00000FFD F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; TEST FOR SHIFT STATE
   800 00001000 740C                <1> 	jz	short K22		; JUMP IF BASE STATE
   801                              <1> K20:					; NUMERIC ZERO, NOT INSERT KEY
   802 00001002 88C4                <1> 	mov	ah, al			; PUT SCAN CODE BACK IN AH
   803 00001004 E99E000000          <1>         jmp     K25                     ; NUMERAL '0', STNDRD. PROCESSING
   804                              <1> K21:					; MIGHT BE NUMERIC
   805 00001009 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT
   806 0000100C 74F4                <1> 	jz	short K20		; IS NUMERIC, STD. PROC.
   807                              <1> 	;
   808                              <1> K22:					; SHIFT TOGGLE KEY HIT; PROCESS IT
   809 0000100E 8425[EE5E0000]      <1> 	test	ah, [KB_FLAG_1] 	; IS KEY ALREADY DEPRESSED
   810 00001014 0F85A5000000        <1>         jnz     K26                     ; JUMP IF KEY ALREADY DEPRESSED
   811                              <1> K22A:
   812 0000101A 0825[EE5E0000]      <1>         or      [KB_FLAG_1], ah 	; INDICATE THAT THE KEY IS DEPRESSED
   813 00001020 3025[ED5E0000]      <1> 	xor	[KB_FLAG], ah		; TOGGLE THE SHIFT STATE
   814                              <1> 	;
   815                              <1> 	;-----	TOGGLE LED IF CAPS, NUM  OR SCROLL KEY DEPRESSED
   816 00001026 F6C470              <1> 	test	ah, CAPS_SHIFT+NUM_SHIFT+SCROLL_SHIFT ; SHIFT TOGGLE?
   817 00001029 7409                <1> 	jz	short K22B		; GO IF NOT
   818                              <1> 	;
   819 0000102B 6650                <1> 	push	ax			; SAVE SCAN CODE AND SHIFT MASK
   820 0000102D E8F9030000          <1> 	call	SND_LED			; GO TURN MODE INDICATORS ON
   821 00001032 6658                <1> 	pop	ax			; RESTORE SCAN CODE
   822                              <1> K22B:
   823 00001034 3C52                <1> 	cmp	al, INS_KEY		; TEST FOR 1ST MAKE OF INSERT KEY
   824 00001036 0F8583000000        <1>         jne     K26                     ; JUMP IF NOT INSERT KEY
   825 0000103C 88C4                <1> 	mov	ah, al		        ; SCAN CODE IN BOTH HALVES OF AX
   826 0000103E E999000000          <1>         jmp     K28                     ; FLAGS UPDATED, PROC. FOR BUFFER
   827                              <1> 	;
   828                              <1> 	;-----	BREAK SHIFT FOUND
   829                              <1> K23:					; BREAK-SHIFT-FOUND
   830 00001043 80FC10              <1> 	cmp	ah, SCROLL_SHIFT	; IS THIS A TOGGLE KEY
   831 00001046 F6D4                <1> 	not	ah			; INVERT MASK
   832 00001048 7355                <1> 	jae	short K24		; YES, HANDLE BREAK TOGGLE
   833 0000104A 2025[ED5E0000]      <1> 	and	[KB_FLAG], ah		; TURN OFF SHIFT BIT
   834 00001050 80FCFB              <1> 	cmp	ah, ~CTL_SHIFT		; IS THIS ALT OR CTL?
   835 00001053 7730                <1> 	ja	short K23D		; NO, ALL DONE
   836                              <1> 	;
   837 00001055 F6C702              <1> 	test	bh, LC_E0		; 2ND ALT OR CTL?
   838 00001058 7408                <1> 	jz	short K23A		; NO, HANSLE NORMALLY
   839 0000105A 2025[F05E0000]      <1> 	and 	[KB_FLAG_3], ah		; RESET BIT FOR RIGHT ALT OR CTL
   840 00001060 EB08                <1> 	jmp	short K23B		; CONTINUE
   841                              <1> K23A:
   842 00001062 D2FC                <1> 	sar	ah, cl			; MOVE THE MASK BIT TWO POSITIONS
   843 00001064 2025[EE5E0000]      <1> 	and	[KB_FLAG_1], ah		; RESET BIT FOR LEFT ALT AND CTL
   844                              <1> K23B:
   845 0000106A 88C4                <1> 	mov	ah, al			; SAVE SCAN CODE
   846 0000106C A0[F05E0000]        <1> 	mov	al, [KB_FLAG_3]		; GET RIGHT ALT & CTRL FLAGS
   847 00001071 D2E8                <1> 	shr	al, cl			; MOVE TO BITS 1 & 0
   848 00001073 0A05[EE5E0000]      <1> 	or	al, [KB_FLAG_1]		; PUT IN LEFT ALT & CTL FLAGS
   849 00001079 D2E0                <1> 	shl	al, cl			; MOVE BACK TO BITS 3 & 2
   850 0000107B 240C                <1> 	and	al, ALT_SHIFT+CTL_SHIFT ; FILTER OUT OTHER GARBAGE
   851 0000107D 0805[ED5E0000]      <1> 	or	[KB_FLAG], al		; PUT RESULT IN THE REAL FLAGS	
   852 00001083 88E0                <1> 	mov	al, ah
   853                              <1> K23D:
   854 00001085 3CB8                <1> 	cmp	al, ALT_KEY+80h		; IS THIS ALTERNATE SHIFT RELEASE
   855 00001087 7536                <1> 	jne	short K26		; INTERRUPT RETURN
   856                              <1> 	;	
   857                              <1> 	;-----	ALTERNATE SHIFT KEY RELEASED, GET THE VALUE INTO BUFFER
   858 00001089 A0[F15E0000]        <1> 	mov	al, [ALT_INPUT]
   859 0000108E B400                <1> 	mov	ah, 0			; SCAN CODE OF 0
   860 00001090 8825[F15E0000]      <1> 	mov	[ALT_INPUT], ah 	; ZERO OUT THE FIELD
   861 00001096 3C00                <1> 	cmp	al, 0			; WAS THE INPUT = 0?
   862 00001098 7425                <1> 	je	short K26		; INTERRUPT_RETURN
   863                              <1>         ; 29/01/2016
   864                              <1> 	;jmp     K61                    ; IT WASN'T, SO PUT IN BUFFER
   865 0000109A E9D0020000          <1> 	jmp	_K60
   866                              <1> 	;
   867                              <1> K24:					; BREAK-TOGGLE
   868 0000109F 2025[EE5E0000]      <1> 	and	[KB_FLAG_1], ah 	; INDICATE NO LONGER DEPRESSED
   869 000010A5 EB18                <1> 	jmp	short K26		; INTERRUPT_RETURN
   870                              <1> 	;
   871                              <1> 	;-----	TEST FOR HOLD STATE
   872                              <1> 					; AL, AH = SCAN CODE
   873                              <1> K25:					; NO-SHIFT-FOUND
   874 000010A7 3C80                <1> 	cmp	al, 80h			; TEST FOR BREAK KEY
   875 000010A9 7314                <1> 	jae	short K26		; NOTHING FOR BREAK CHARS FROM HERE ON
   876 000010AB F605[EE5E0000]08    <1> 	test	byte [KB_FLAG_1], HOLD_STATE ; ARE WE IN HOLD STATE
   877 000010B2 7428                <1> 	jz	short K28		; BRANCH AROUND TEST IF NOT
   878 000010B4 3C45                <1> 	cmp	al, NUM_KEY
   879 000010B6 7407                <1> 	je	short K26		; CAN'T END HOLD ON NUM_LOCK
   880 000010B8 8025[EE5E0000]F7    <1> 	and	byte [KB_FLAG_1], ~HOLD_STATE ; TURN OFF THE HOLD STATE BIT
   881                              <1> 	;
   882                              <1> K26:
   883 000010BF 8025[F05E0000]FC    <1> 	and	byte [KB_FLAG_3], ~(LC_E0+LC_E1) ; RESET LAST CHAR H.C. FLAG
   884                              <1> K26A:					; INTERRUPT-RETURN
   885 000010C6 FA                  <1> 	cli				; TURN OFF INTERRUPTS
   886 000010C7 B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
   887 000010C9 E620                <1> 	out	20h, al	;out INTA00, al	; SEND COMMAND TO INTERRUPT CONTROL PORT
   888                              <1> K27:					; INTERRUPT-RETURN-NO-EOI
   889 000010CB B0AE                <1> 	mov	al, ENA_KBD		; INSURE KEYBOARD IS ENABLED
   890 000010CD E8F8020000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
   891                              <1> K27A:
   892 000010D2 FA                  <1> 	cli				; DISABLE INTERRUPTS
   893                              <1> 	;;mov	byte [intflg], 0 ; 07/01/2017 ;; 15/01/2017
   894 000010D3 07                  <1> 	pop	es			; RESTORE REGISTERS
   895 000010D4 1F                  <1> 	pop	ds
   896 000010D5 5F                  <1> 	pop	edi
   897 000010D6 5E                  <1> 	pop	esi
   898 000010D7 5A                  <1> 	pop	edx
   899 000010D8 59                  <1> 	pop	ecx
   900 000010D9 5B                  <1> 	pop	ebx
   901 000010DA 58                  <1> 	pop	eax
   902                              <1> 	;pop	ebp
   903 000010DB CF                  <1> 	iretd				; RETURN
   904                              <1> 
   905                              <1> 	;-----	NOT IN	HOLD STATE
   906                              <1> K28:					; NO-HOLD-STATE
   907 000010DC 3C58                <1> 	cmp	al, 88			; TEST FOR OUT-OF-RANGE SCAN CODES
   908 000010DE 77DF                <1> 	ja	short K26		; IGNORE IF OUT-OF-RANGE	
   909                              <1> 	;
   910 000010E0 F6C308              <1> 	test	bl, ALT_SHIFT 		; ARE WE IN ALTERNATE SHIFT
   911                              <1>         ;jz	short K28A		; IF NOT ALTERNATE
   912 000010E3 0F84F1000000        <1>         jz      K38
   913                              <1> 	;
   914 000010E9 F6C710              <1> 	test	bh, KBX			; IS THIS THE ENCHANCED KEYBOARD?
   915 000010EC 740D                <1> 	jz	short K29		; NO, ALT STATE IS REAL
   916                              <1> 	 ;28/02/2015
   917 000010EE F605[EE5E0000]04    <1> 	test	byte [KB_FLAG_1], SYS_SHIFT ; YES, IS SYSREQ KEY DOWN?
   918                              <1> 	;jz	short K29		;  NO, ALT STATE IS REAL
   919 000010F5 0F85DF000000        <1> 	jnz	K38			; YES, THIS IS PHONY ALT STATE 
   920                              <1>         ;				; DUE TO PRESSING SYSREQ	
   921                              <1> ;K28A:	jmp	short K38
   922                              <1> 	;
   923                              <1> 	;-----	TEST FOR RESET KEY SEQUENCE (CTL ALT DEL)
   924                              <1> K29:					; TEST-RESET
   925 000010FB F6C304              <1> 	test	bl, CTL_SHIFT 		; ARE WE IN CONTROL SHIFT ALSO?
   926 000010FE 740B                <1> 	jz	short K31		; NO_RESET
   927 00001100 3C53                <1> 	cmp	al, DEL_KEY		; CTL-ALT STATE, TEST FOR DELETE KEY
   928 00001102 7507                <1> 	jne	short K31		; NO_RESET, IGNORE
   929                              <1> 	;
   930                              <1> 	;-----	CTL-ALT-DEL HAS BEEN FOUND
   931                              <1>  	; 26/08/2014
   932                              <1> cpu_reset:
   933                              <1> 	; IBM PC/AT ROM BIOS source code - 10/06/85 (TEST4.ASM - PROC_SHUTDOWN)
   934                              <1> 	; Send FEh (system reset command) to the keyboard controller.
   935 00001104 B0FE                <1> 	mov	al, SHUT_CMD		; SHUTDOWN COMMAND
   936 00001106 E664                <1> 	out	STATUS_PORT, al		; SEND TO KEYBOARD CONTROL PORT
   937                              <1> khere:
   938 00001108 F4                  <1> 	hlt				; WAIT FOR 80286 RESET
   939 00001109 EBFD                <1> 	jmp 	short khere		; INSURE HALT
   940                              <1> 
   941                              <1> 	;
   942                              <1> 	;-----	IN ALTERNATE SHIFT, RESET NOT FOUND
   943                              <1> K31:					; NO-RESET
   944 0000110B 3C39                <1> 	cmp	al, 57			; TEST FOR SPACE KEY
   945 0000110D 7507                <1> 	jne	short K311		; NOT THERE
   946 0000110F B020                <1> 	mov	al, ' '			; SET SPACE CHAR
   947 00001111 E948020000          <1>         jmp     K57                     ; BUFFER_FILL
   948                              <1> K311:
   949 00001116 3C0F                <1> 	cmp	al, 15			; TEST FOR TAB KEY
   950 00001118 7509                <1> 	jne	short K312		; NOT THERE
   951 0000111A 66B800A5            <1> 	mov	ax, 0A500h		; SET SPECIAL CODE FOR ALT-TAB
   952 0000111E E93B020000          <1>         jmp     K57                     ; BUFFER_FILL
   953                              <1> K312:
   954 00001123 3C4A                <1> 	cmp	al, 74			; TEST FOR KEY PAD -
   955 00001125 0F84A2000000        <1>         je      K37B                    ; GO PROCESS
   956 0000112B 3C4E                <1> 	cmp	al, 78			; TEST FOR KEY PAD +
   957 0000112D 0F849A000000        <1>         je      K37B                    ; GO PROCESS
   958                              <1> 	;
   959                              <1> 	;-----	LOOK FOR KEY PAD ENTRY
   960                              <1> K32:					; ALT-KEY-PAD
   961 00001133 BF[B05D0000]        <1> 	mov	edi, K30		; ALT-INPUT-TABLE offset
   962 00001138 B90A000000          <1> 	mov	ecx, 10			; LOOK FOR ENTRY USING KEYPAD
   963 0000113D F2AE                <1> 	repne	scasb			; LOOK FOR MATCH
   964 0000113F 7525                <1> 	jne	short K33		; NO_ALT_KEYPAD
   965 00001141 F6C702              <1> 	test	bh, LC_E0		; IS THIS ONE OF THE NEW KEYS?
   966 00001144 0F858A000000        <1>         jnz     K37C                    ; YES, JUMP, NOT NUMPAD KEY
   967 0000114A 81EF[B15D0000]      <1> 	sub	edi, K30+1		; DI NOW HAS ENTRY VALUE
   968 00001150 A0[F15E0000]        <1> 	mov	al, [ALT_INPUT] 	; GET THE CURRENT BYTE
   969 00001155 B40A                <1> 	mov	ah, 10			; MULTIPLY BY 10
   970 00001157 F6E4                <1> 	mul	ah
   971 00001159 6601F8              <1> 	add	ax, di			; ADD IN THE LATEST ENTRY
   972 0000115C A2[F15E0000]        <1> 	mov	[ALT_INPUT], al 	; STORE IT AWAY
   973                              <1> ;K32A:
   974 00001161 E959FFFFFF          <1>         jmp     K26                     ; THROW AWAY THAT KEYSTROKE
   975                              <1> 	;
   976                              <1> 	;-----	LOOK FOR SUPERSHIFT ENTRY
   977                              <1> K33:					; NO-ALT-KEYPAD
   978 00001166 C605[F15E0000]00    <1>         mov     byte [ALT_INPUT], 0     ; ZERO ANY PREVIOUS ENTRY INTO INPUT
   979 0000116D B91A000000          <1> 	mov	ecx, 26			; (DI),(ES) ALREADY POINTING
   980 00001172 F2AE                <1> 	repne	scasb			; LOOK FOR MATCH IN ALPHABET
   981 00001174 7450                <1> 	je	short K37A		; MATCH FOUND, GO FILLL THE BUFFER
   982                              <1> 	;
   983                              <1> 	;-----	LOOK FOR TOP ROW OF ALTERNATE SHIFT
   984                              <1> K34:					; ALT-TOP-ROW
   985 00001176 3C02                <1> 	cmp	al, 2			; KEY WITH '1' ON IT
   986 00001178 7253                <1> 	jb	short K37B		; MUST BE ESCAPE
   987 0000117A 3C0D                <1> 	cmp	al, 13			; IS IT IN THE REGION
   988 0000117C 7705                <1> 	ja	short K35		; NO, ALT SOMETHING ELSE
   989 0000117E 80C476              <1> 	add	ah, 118			; CONVERT PSEUDO SCAN CODE TO RANGE
   990 00001181 EB43                <1> 	jmp	short K37A		; GO FILL THE BUFFER
   991                              <1> 	;
   992                              <1> 	;-----	TRANSLATE ALTERNATE SHIFT PSEUDO SCAN CODES
   993                              <1> K35:					; ALT-FUNCTION
   994 00001183 3C57                <1> 	cmp	al, F11_M		; IS IT F11?	
   995 00001185 7209                <1> 	jb	short K35A ; 20/02/2015	; NO, BRANCH
   996 00001187 3C58                <1> 	cmp	al, F12_M		; IS IT F12?
   997 00001189 7705                <1> 	ja	short K35A ; 20/02/2015	; NO, BRANCH
   998 0000118B 80C434              <1> 	add	ah, 52			; CONVERT TO PSEUDO SCAN CODE
   999 0000118E EB36                <1> 	jmp	short K37A		; GO FILL THE BUFFER
  1000                              <1> K35A:
  1001 00001190 F6C702              <1> 	test	bh, LC_E0		; DO WE HAVE ONE OF THE NEW KEYS?
  1002 00001193 7422                <1> 	jz	short K37		; NO, JUMP
  1003 00001195 3C1C                <1> 	cmp	al, 28			; TEST FOR KEYPAD ENTER
  1004 00001197 7509                <1>         jne     short K35B              ; NOT THERE
  1005 00001199 66B800A6            <1> 	mov	ax, 0A600h		; SPECIAL CODE
  1006 0000119D E9BC010000          <1> 	jmp	K57			; BUFFER FILL
  1007                              <1> K35B:
  1008 000011A2 3C53                <1> 	cmp	al, 83			; TEST FOR DELETE KEY
  1009 000011A4 742E                <1> 	je	short K37C		; HANDLE WITH OTHER EDIT KEYS
  1010 000011A6 3C35                <1> 	cmp	al, 53			; TEST FOR KEYPAD /
  1011                              <1> 	;jne	short K32A		; NOT THERE, NO OTHER E0 SPECIALS	
  1012 000011A8 0F8511FFFFFF        <1>         jne     K26
  1013 000011AE 66B800A4            <1> 	mov	ax, 0A400h		; SPECIAL CODE
  1014 000011B2 E9A7010000          <1> 	jmp	K57			; BUFFER FILL
  1015                              <1> K37:
  1016 000011B7 3C3B                <1> 	cmp	al, 59			; TEST FOR FUNCTION KEYS (F1)
  1017 000011B9 7212                <1>         jb      short K37B		; NO FN, HANDLE W/OTHER EXTENDED
  1018 000011BB 3C44                <1> 	cmp	al, 68			; IN KEYPAD REGION?
  1019                              <1>         ;ja	short K32A		; IF SO, IGNORE
  1020 000011BD 0F87FCFEFFFF        <1>         ja      K26
  1021 000011C3 80C42D              <1> 	add	ah, 45			; CONVERT TO PSEUDO SCAN CODE
  1022                              <1> K37A:
  1023 000011C6 B000                <1> 	mov	al, 0			; ASCII CODE OF ZERO
  1024 000011C8 E991010000          <1>         jmp     K57                     ; PUT IT IN THE BUFFER
  1025                              <1> K37B:
  1026 000011CD B0F0                <1> 	mov	al, 0F0h		; USE SPECIAL ASCII CODE
  1027 000011CF E98A010000          <1> 	jmp     K57                     ; PUT IT IN THE BUFFER
  1028                              <1> K37C:
  1029 000011D4 0450                <1> 	add	al, 80			; CONVERT SCAN CODE (EDIT KEYS)
  1030 000011D6 88C4                <1> 	mov	ah, al			; (SCAN CODE NOT IN AH FOR INSERT)
  1031 000011D8 EBEC                <1> 	jmp     short K37A              ; PUT IT IN THE BUFFER
  1032                              <1> 	;
  1033                              <1> 	;-----	NOT IN ALTERNATE SHIFT
  1034                              <1> K38:					; NOT-ALT-SHIFT
  1035                              <1> 					; BL STILL HAS SHIFT FLAGS
  1036 000011DA F6C304              <1> 	test	bl, CTL_SHIFT 		; ARE WE IN CONTROL SHIFT?
  1037                              <1> 	;jnz	short K38A		; YES, START PROCESSING	
  1038 000011DD 0F84B0000000        <1>         jz      K44                     ; NOT-CTL-SHIFT
  1039                              <1> 	;
  1040                              <1> 	;-----	CONTROL SHIFT, TEST SPECIAL CHARACTERS
  1041                              <1> 	;-----	TEST FOR BREAK
  1042                              <1> K38A:
  1043 000011E3 3C46                <1> 	cmp	al, SCROLL_KEY		; TEST FOR BREAK
  1044 000011E5 7531                <1> 	jne	short K39		; JUMP, NO-BREAK
  1045 000011E7 F6C710              <1> 	test	bh, KBX			; IS THIS THE ENHANCED KEYBOARD?
  1046 000011EA 7405                <1> 	jz	short K38B		; NO, BREAK IS VALID	
  1047 000011EC F6C702              <1> 	test	bh, LC_E0		; YES, WAS LAST CODE AN E0?
  1048 000011EF 7427                <1> 	jz	short K39		; NO-BREAK, TEST FOR PAUSE	
  1049                              <1> K38B:
  1050 000011F1 8B1D[FA5E0000]      <1> 	mov	ebx, [BUFFER_HEAD] 	; RESET BUFFER TO EMPTY
  1051 000011F7 891D[FE5E0000]      <1> 	mov	[BUFFER_TAIL], ebx
  1052 000011FD C605[EC5E0000]80    <1> 	mov	byte [BIOS_BREAK], 80h  ; TURN ON BIOS_BREAK BIT
  1053                              <1> 	;
  1054                              <1> 	;-----	ENABLE KEYBOARD
  1055 00001204 B0AE                <1> 	mov	al, ENA_KBD		; ENABLE KEYBOARD
  1056 00001206 E8BF010000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
  1057                              <1> 	;
  1058                              <1> 	; CTRL+BREAK code here !!!
  1059                              <1> 	;INT	1BH			; BREAK INTERRUPT VECTOR
  1060                              <1> 	; 17/10/2015	
  1061 0000120B E836520000          <1> 	call	ctrlbrk ; control+break subroutine
  1062                              <1> 	;
  1063 00001210 6629C0              <1> 	sub	ax, ax			; PUT OUT DUMMY CHARACTER
  1064 00001213 E946010000          <1>         jmp     K57                     ; BUFFER_FILL
  1065                              <1> 	;
  1066                              <1> 	;-----	TEST FOR PAUSE
  1067                              <1> K39:					; NO_BREAK
  1068 00001218 F6C710              <1> 	test	bh, KBX			; IS THIS THE ENHANCED KEYBOARD?
  1069 0000121B 7537                <1> 	jnz	short K41		; YES, THEN THIS CAN'T BE PAUSE	
  1070 0000121D 3C45                <1> 	cmp	al, NUM_KEY		; LOOK FOR PAUSE KEY
  1071 0000121F 7533                <1> 	jne	short K41		; NO-PAUSE
  1072                              <1> K39P:
  1073 00001221 800D[EE5E0000]08    <1> 	or	byte [KB_FLAG_1], HOLD_STATE ; TURN ON THE HOLD FLAG
  1074                              <1> 	;
  1075                              <1> 	;-----	ENABLE KEYBOARD
  1076 00001228 B0AE                <1> 	mov	al, ENA_KBD		; ENABLE KEYBOARD
  1077 0000122A E89B010000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
  1078                              <1> K39A:
  1079 0000122F B020                <1> 	mov	al, EOI			; END OF INTERRUPT TO CONTROL PORT
  1080 00001231 E620                <1> 	out	20h, al ;out INTA00, al	; ALLOW FURTHER KEYSTROKE INTERRUPTS
  1081                              <1> 	;
  1082                              <1> 	;-----	DURING PAUSE INTERVAL, TURN COLOR CRT BACK ON
  1083 00001233 803D[225F0000]07    <1>         cmp     byte [CRT_MODE], 7      ; IS THIS BLACK AND WHITE CARD
  1084 0000123A 740A                <1>         je      short K40              	; YES, NOTHING TO DO
  1085 0000123C 66BAD803            <1> 	mov	dx, 03D8h		; PORT FOR COLOR CARD
  1086 00001240 A0[235F0000]        <1>         mov     al, [CRT_MODE_SET] 	; GET THE VALUE OF THE CURRENT MODE
  1087 00001245 EE                  <1> 	out	dx, al			; SET THE CRT MODE, SO THAT CRT IS ON
  1088                              <1> 	;
  1089                              <1> K40:					; PAUSE-LOOP
  1090 00001246 F605[EE5E0000]08    <1>         test    byte [KB_FLAG_1], HOLD_STATE ; CHECK HOLD STATE FLAG
  1091 0000124D 75F7                <1> 	jnz	short K40		; LOOP UNTIL FLAG TURNED OFF
  1092                              <1> 	;
  1093 0000124F E977FEFFFF          <1>         jmp     K27                     ; INTERRUPT_RETURN_NO_EOI
  1094                              <1>         ;
  1095                              <1> 	;-----	TEST SPECIAL CASE KEY 55
  1096                              <1> K41:					; NO-PAUSE
  1097 00001254 3C37                <1> 	cmp	al, 55			; TEST FOR */PRTSC KEY
  1098 00001256 7513                <1> 	jne	short K42		; NOT-KEY-55
  1099 00001258 F6C710              <1> 	test	bh, KBX			; IS THIS THE ENHANCED KEYBOARD?
  1100 0000125B 7405                <1> 	jz	short K41A		; NO, CTL-PRTSC IS VALID	
  1101 0000125D F6C702              <1> 	test	bh, LC_E0		; YES, WAS LAST CODE AN E0?
  1102 00001260 7421                <1> 	jz	short K42B		; NO, TRANSLATE TO A FUNCTION
  1103                              <1> K41A:	
  1104 00001262 66B80072            <1> 	mov	ax, 114*256		; START/STOP PRINTING SWITCH
  1105 00001266 E9F3000000          <1>         jmp     K57                     ; BUFFER_FILL
  1106                              <1> 	;
  1107                              <1> 	;-----	SET UP TO TRANSLATE CONTROL SHIFT
  1108                              <1> K42:					; NOT-KEY-55
  1109 0000126B 3C0F                <1> 	cmp	al, 15			; IS IT THE TAB KEY?
  1110 0000126D 7414                <1> 	je	short K42B		; YES, XLATE TO FUNCTION CODE
  1111 0000126F 3C35                <1> 	cmp	al, 53			; IS IT THE / KEY?
  1112 00001271 750E                <1> 	jne	short K42A		; NO, NO MORE SPECIAL CASES	
  1113 00001273 F6C702              <1> 	test	bh, LC_E0		; YES, IS IT FROM THE KEY PAD?
  1114 00001276 7409                <1> 	jz	short K42A		; NO, JUST TRANSLATE
  1115 00001278 66B80095            <1> 	mov	ax, 9500h		; YES, SPECIAL CODE FOR THIS ONE
  1116 0000127C E9DD000000          <1> 	jmp	K57			; BUFFER FILL	
  1117                              <1> K42A: 
  1118                              <1> 	;;mov	ebx, _K8		; SET UP TO TRANSLATE CTL
  1119 00001281 3C3B                <1> 	cmp	al, 59			; IS IT IN CHARACTER TABLE?
  1120                              <1>         ;jb	short K45F              ; YES, GO TRANSLATE CHAR
  1121                              <1> 	;;jb	K56 ; 20/02/2015
  1122                              <1> 	;;jmp	K64 ; 20/02/2015
  1123                              <1> K42B:
  1124 00001283 BB[E45D0000]        <1> 	mov	ebx, _K8		; SET UP TO TRANSLATE CTL
  1125 00001288 0F82AE000000        <1> 	jb	K56 ;; 20/02/2015	
  1126 0000128E E9B9000000          <1> 	jmp	K64	
  1127                              <1>         ;
  1128                              <1> 	;-----	NOT IN CONTROL SHIFT
  1129                              <1> K44:					; NOT-CTL-SHIFT
  1130 00001293 3C37                <1> 	cmp	al, 55			; PRINT SCREEN KEY?
  1131 00001295 7528                <1> 	jne	short K45		; NOT PRINT SCREEN
  1132 00001297 F6C710              <1> 	test	bh, KBX			; IS THIS ENHANCED KEYBOARD?
  1133 0000129A 7407                <1> 	jz	short K44A		; NO, TEST FOR SHIFT STATE	
  1134 0000129C F6C702              <1> 	test	bh, LC_E0		; YES, LAST CODE A MARKER?
  1135 0000129F 7507                <1> 	jnz	short K44B		; YES, IS PRINT SCREEN
  1136 000012A1 EB41                <1> 	jmp	short K45C		; NO, TRANSLATE TO '*' CHARACTER
  1137                              <1> K44A:
  1138 000012A3 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; NOT 101 KBD, SHIFT KEY DOWN?
  1139 000012A6 743C                <1> 	jz	short K45C		; NO, TRANSLATE TO '*' CHARACTER
  1140                              <1> 	;
  1141                              <1> 	;-----	ISSUE INTERRUPT TO INDICATE PRINT SCREEN FUNCTION
  1142                              <1> K44B:
  1143 000012A8 B0AE                <1> 	mov	al, ENA_KBD		; INSURE KEYBOARD IS ENABLED
  1144 000012AA E81B010000          <1> 	call	SHIP_IT			; EXECUTE ENABLE
  1145 000012AF B020                <1> 	mov	al, EOI			; END OF CURRENT INTERRUPT
  1146 000012B1 E620                <1> 	out	20h, al ;out INTA00, al	; SO FURTHER THINGS CAN HAPPEN
  1147                              <1> 	; Print Screen !!!		; ISSUE PRINT SCREEN INTERRUPT (INT 05h)
  1148                              <1> 	;PUSH 	BP			; SAVE POINTER
  1149                              <1> 	;INT 	5H			; ISSUE PRINT SCREEN INTERRUPT
  1150                              <1> 	;POP	BP			; RESTORE POINTER
  1151 000012B3 8025[F05E0000]FC    <1>         and     byte [KB_FLAG_3], ~(LC_E0+LC_E1) ; ZERO OUT THESE FLAGS
  1152 000012BA E90CFEFFFF          <1>         jmp     K27                     ; GO BACK WITHOUT EOI OCCURRING
  1153                              <1> 	;
  1154                              <1> 	;-----	HANDLE IN-CORE KEYS
  1155                              <1> K45:					; NOT-PRINT-SCREEN
  1156 000012BF 3C3A                <1> 	cmp	al, 58			; TEST FOR IN-CORE AREA
  1157 000012C1 7734                <1> 	ja	short K46		; JUMP IF NOT
  1158 000012C3 3C35                <1> 	cmp	al, 53			; IS THIS THE '/' KEY?
  1159 000012C5 7505                <1> 	jne	short K45A		; NO, JUMP
  1160 000012C7 F6C702              <1> 	test	bh, LC_E0		; WAS THE LAST CODE THE MARKER?
  1161 000012CA 7518                <1> 	jnz	short K45C		; YES, TRANSLATE TO CHARACTER
  1162                              <1> K45A:
  1163 000012CC B91A000000          <1> 	mov	ecx, 26			; LENGHT OF SEARCH
  1164 000012D1 BF[BA5D0000]        <1> 	mov	edi, K30+10		; POINT TO TABLE OF A-Z CHARS
  1165 000012D6 F2AE                <1> 	repne	scasb			; IS THIS A LETTER KEY?
  1166                              <1> 		; 20/02/2015
  1167 000012D8 7505                <1> 	jne	short K45B              ; NO, SYMBOL KEY
  1168                              <1> 	;
  1169 000012DA F6C340              <1> 	test	bl, CAPS_STATE		; ARE WE IN CAPS_LOCK?
  1170 000012DD 750C                <1> 	jnz	short K45D		; TEST FOR SURE
  1171                              <1> K45B:
  1172 000012DF F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; ARE WE IN SHIFT STATE?
  1173 000012E2 750C                <1> 	jnz	short K45E		; YES, UPPERCASE
  1174                              <1> 					; NO, LOWERCASE
  1175                              <1> K45C:
  1176 000012E4 BB[3C5E0000]        <1> 	mov	ebx, K10		; TRANSLATE TO LOWERCASE LETTERS
  1177 000012E9 EB51                <1> 	jmp	short K56	
  1178                              <1> K45D:					; ALMOST-CAPS-STATE
  1179 000012EB F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; CL ON. IS SHIFT ON, TOO?
  1180 000012EE 75F4                <1> 	jnz	short K45C		; SHIFTED TEMP OUT OF CAPS STATE
  1181                              <1> K45E:
  1182 000012F0 BB[945E0000]        <1> 	mov	ebx, K11		; TRANSLATE TO UPPER CASE LETTERS
  1183 000012F5 EB45                <1> K45F:	jmp	short K56
  1184                              <1> 	;
  1185                              <1> 	;-----	TEST FOR KEYS F1 - F10
  1186                              <1> K46:					; NOT IN-CORE AREA
  1187 000012F7 3C44                <1> 	cmp	al, 68			; TEST FOR F1 - F10
  1188                              <1> 	;ja	short K47		; JUMP IF NOT
  1189                              <1> 	;jmp	short K53		; YES, GO DO FN KEY PROCESS			
  1190 000012F9 7635                <1> 	jna	short K53		
  1191                              <1> 	;
  1192                              <1> 	;-----	HANDLE THE NUMERIC PAD KEYS
  1193                              <1> K47:					; NOT F1 - F10
  1194 000012FB 3C53                <1> 	cmp	al, 83			; TEST NUMPAD KEYS
  1195 000012FD 772D                <1> 	ja	short K52		; JUMP IF NOT
  1196                              <1> 	;
  1197                              <1> 	;-----	KEYPAD KEYS, MUST TEST NUM LOCK FOR DETERMINATION
  1198                              <1> K48:
  1199 000012FF 3C4A                <1> 	cmp	al , 74			; SPECIAL CASE FOR MINUS
  1200 00001301 74ED                <1> 	je	short K45E		; GO TRANSLATE
  1201 00001303 3C4E                <1> 	cmp	al , 78			; SPECIAL CASE FOR PLUS
  1202 00001305 74E9                <1> 	je	short K45E		; GO TRANSLATE
  1203 00001307 F6C702              <1> 	test	bh, LC_E0		; IS THIS ONE OFTHE NEW KEYS?
  1204 0000130A 750A                <1> 	jnz	short K49		; YES, TRANSLATE TO BASE STATE
  1205                              <1> 	;		
  1206 0000130C F6C320              <1> 	test 	bl, NUM_STATE		; ARE WE IN NUM LOCK
  1207 0000130F 7514                <1> 	jnz	short K50		; TEST FOR SURE
  1208 00001311 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; ARE WE IN SHIFT STATE?
  1209                              <1> 	;jnz	short K51		; IF SHIFTED, REALLY NUM STATE
  1210 00001314 75DA                <1> 	jnz	short K45E
  1211                              <1> 	;
  1212                              <1> 	;-----	BASE CASE FOR KEYPAD
  1213                              <1> K49:					
  1214 00001316 3C4C                <1> 	cmp	al, 76			; SPECIAL CASE FOR BASE STATE 5
  1215 00001318 7504                <1> 	jne	short K49A		; CONTINUE IF NOT KEYPAD 5
  1216 0000131A B0F0                <1> 	mov	al, 0F0h		; SPECIAL ASCII CODE	
  1217 0000131C EB40                <1> 	jmp	short K57		; BUFFER FILL
  1218                              <1> K49A:
  1219 0000131E BB[3C5E0000]        <1> 	mov	ebx, K10		; BASE CASE TABLE	
  1220 00001323 EB27                <1> 	jmp	short K64		; CONVERT TO PSEUDO SCAN
  1221                              <1> 	;
  1222                              <1> 	;-----	MIGHT BE NUM LOCK, TEST SHIFT STATUS
  1223                              <1> K50:					; ALMOST-NUM-STATE
  1224 00001325 F6C303              <1>         test    bl, LEFT_SHIFT+RIGHT_SHIFT
  1225 00001328 75EC                <1> 	jnz 	short K49		; SHIFTED TEMP OUT OF NUM STATE
  1226 0000132A EBC4                <1> K51:	jmp	short K45E		; REALLY NUM STATE
  1227                              <1> 	;
  1228                              <1> 	;-----	TEST FOR THE NEW KEYS ON WT KEYBOARDS 
  1229                              <1> K52:					; NOT A NUMPAD KEY
  1230 0000132C 3C56                <1> 	cmp	al, 86			; IS IT THE NEW WT KEY?
  1231                              <1> 	;jne	short K53		; JUMP IF NOT
  1232                              <1> 	;jmp	short K45B		; HANDLE WITH REST OF LETTER KEYS
  1233 0000132E 74AF                <1> 	je	short K45B		
  1234                              <1> 	;
  1235                              <1> 	;-----	MUST BE F11 OR F12 
  1236                              <1> K53:					; F1 - F10 COME HERE, TOO
  1237 00001330 F6C303              <1> 	test	bl, LEFT_SHIFT+RIGHT_SHIFT ; TEST SHIFT STATE
  1238 00001333 74E1                <1> 	jz	short K49		; JUMP, LOWER CASE PSEUDO SC'S
  1239                              <1> 		; 20/02/2015 
  1240 00001335 BB[945E0000]        <1> 	mov	ebx, K11		; UPPER CASE PSEUDO SCAN CODES
  1241 0000133A EB10                <1> 	jmp	short K64		; TRANSLATE SCAN
  1242                              <1> 	;
  1243                              <1> 	;-----	TRANSLATE THE CHARACTER
  1244                              <1> K56:					; TRANSLATE-CHAR
  1245 0000133C FEC8                <1> 	dec	al			; CONVERT ORIGIN
  1246 0000133E D7                  <1> 	xlat    			; CONVERT THE SCAN CODE TO ASCII
  1247 0000133F F605[F05E0000]02    <1> 	test	byte [KB_FLAG_3], LC_E0	; IS THIS A NEW KEY?
  1248 00001346 7416                <1> 	jz	short K57		; NO, GO FILL BUFFER
  1249 00001348 B4E0                <1> 	mov	ah, MC_E0		; YES, PUT SPECIAL MARKER IN AH
  1250 0000134A EB12                <1> 	jmp	short K57		; PUT IT INTO THE BUFFER	
  1251                              <1> 	;
  1252                              <1> 	;-----	TRANSLATE SCAN FOR PSEUDO SCAN CODES
  1253                              <1> K64:					; TRANSLATE-SCAN-ORGD
  1254 0000134C FEC8                <1> 	dec	al			; CONVERT ORIGIN
  1255 0000134E D7                  <1>        	xlat    	                ; CTL TABLE SCAN
  1256 0000134F 88C4                <1> 	mov	ah, al			; PUT VALUE INTO AH
  1257 00001351 B000                <1> 	mov	al, 0			; ZERO ASCII CODE
  1258 00001353 F605[F05E0000]02    <1> 	test	byte [KB_FLAG_3], LC_E0	; IS THIS A NEW KEY?
  1259 0000135A 7402                <1> 	jz	short K57		; NO, GO FILL BUFFER
  1260 0000135C B0E0                <1> 	mov	al, MC_E0		; YES, PUT SPECIAL MARKER IN AL
  1261                              <1> 	;
  1262                              <1> 	;-----	PUT CHARACTER INTO BUFFER
  1263                              <1> K57:					; BUFFER_FILL
  1264 0000135E 3CFF                <1> 	cmp	al, -1			; IS THIS AN IGNORE CHAR
  1265                              <1>         ;je	short K59		; YES, DO NOTHING WITH IT
  1266 00001360 0F8459FDFFFF        <1> 	je      K26			; YES, DO NOTHING WITH IT
  1267 00001366 80FCFF              <1> 	cmp	ah, -1			; LOOK FOR -1 PSEUDO SCAN
  1268                              <1>         ;jne	short K61		; NEAR_INTERRUPT_RETURN
  1269 00001369 0F8450FDFFFF        <1> 	je      K26			; INTERRUPT_RETURN
  1270                              <1> ;K59:					; NEAR_INTERRUPT_RETURN
  1271                              <1> ;	jmp	K26			; INTERRUPT_RETURN
  1272                              <1> 
  1273                              <1> _K60: ; 29/01/2016
  1274 0000136F 80FC68              <1> 	cmp	ah, 68h	; ALT + F1 key
  1275 00001372 721F                <1> 	jb	short K61
  1276 00001374 80FC6F              <1> 	cmp	ah, 6Fh ; ALT + F8 key	
  1277 00001377 771A                <1> 	ja	short K61
  1278                              <1> 	;
  1279 00001379 8A1D[EE580100]      <1> 	mov	bl, [ACTIVE_PAGE]
  1280 0000137F 80C368              <1> 	add	bl, 68h
  1281 00001382 38E3                <1> 	cmp	bl, ah
  1282 00001384 740D                <1> 	je	short K61
  1283 00001386 6650                <1> 	push	ax
  1284 00001388 88E0                <1> 	mov	al, ah
  1285 0000138A 2C68                <1> 	sub	al, 68h
  1286 0000138C E8F4050000          <1> 	call	set_active_page
  1287 00001391 6658                <1> 	pop	ax
  1288                              <1> K61:					; NOT-CAPS-STATE
  1289 00001393 8B1D[FE5E0000]      <1> 	mov	ebx, [BUFFER_TAIL] 	; GET THE END POINTER TO THE BUFFER
  1290 00001399 89DE                <1> 	mov	esi, ebx		; SAVE THE VALUE
  1291 0000139B E857FAFFFF          <1> 	call	_K4			; ADVANCE THE TAIL
  1292 000013A0 3B1D[FA5E0000]      <1> 	cmp	ebx, [BUFFER_HEAD] 	; HAS THE BUFFER WRAPPED AROUND
  1293 000013A6 740E                <1> 	je	short K62		; BUFFER_FULL_BEEP
  1294 000013A8 668906              <1> 	mov	[esi], ax		; STORE THE VALUE
  1295 000013AB 891D[FE5E0000]      <1> 	mov	[BUFFER_TAIL], ebx 	; MOVE THE POINTER UP
  1296 000013B1 E909FDFFFF          <1> 	jmp	K26
  1297                              <1> 	;;cli				; TURN OFF INTERRUPTS
  1298                              <1> 	;;mov	al, EOI			; END OF INTERRUPT COMMAND
  1299                              <1> 	;;out	INTA00, al		; SEND COMMAND TO INTERRUPT CONTROL PORT
  1300                              <1> 	;MOV	AL, ENA_KBD		; INSURE KEYBOARD IS ENABLED
  1301                              <1> 	;CALL	SHIP_IT			; EXECUTE ENABLE
  1302                              <1> 	;MOV	AX, 9102H		; MOVE IN POST CODE & TYPE
  1303                              <1> 	;INT	15H			; PERFORM OTHER FUNCTION
  1304                              <1> 	;;and	byte [KB_FLAG_3],~(LC_E0+LC_E1) ; RESET LAST CHAR H.C. FLAG
  1305                              <1> 	;JMP	K27A			; INTERRUPT_RETURN
  1306                              <1> 	;;jmp   K27                    
  1307                              <1> 	;
  1308                              <1> 	;-----	BUFFER IS FULL SOUND THE BEEPER
  1309                              <1> K62:
  1310 000013B6 B020                <1> 	mov	al, EOI			; ENABLE INTERRUPT CONTROLLER CHIP
  1311 000013B8 E620                <1> 	out	INTA00, al
  1312 000013BA 66B9A602            <1> 	mov	cx, 678			; DIVISOR FOR 1760 HZ
  1313 000013BE B304                <1> 	mov	bl, 4			; SHORT BEEP COUNT (1/16 + 1/64 DELAY)
  1314 000013C0 E8E5090000          <1> 	call	beep			; GO TO COMMON BEEP HANDLER
  1315 000013C5 E901FDFFFF          <1> 	jmp     K27			; EXIT   
  1316                              <1> 
  1317                              <1> SHIP_IT:
  1318                              <1> 	;---------------------------------------------------------------------------------
  1319                              <1> 	; SHIP_IT
  1320                              <1> 	;	THIS ROUTINES HANDLES TRANSMISSION OF COMMAND AND DATA BYTES
  1321                              <1> 	;	TO THE KEYBOARD CONTROLLER.
  1322                              <1> 	;---------------------------------------------------------------------------------
  1323                              <1> 	;
  1324 000013CA 6650                <1> 	push	ax			; SAVE DATA TO SEND
  1325                              <1> 
  1326                              <1> 	;-----	WAIT FOR COMMAND TO ACCEPTED
  1327 000013CC FA                  <1> 	cli				; DISABLE INTERRUPTS TILL DATA SENT
  1328                              <1> 	; xor	ecx, ecx		; CLEAR TIMEOUT COUNTER
  1329 000013CD B900000100          <1> 	mov	ecx, 10000h			
  1330                              <1> S10:
  1331 000013D2 E464                <1> 	in	al, STATUS_PORT		; READ KEYBOARD CONTROLLER STATUS
  1332 000013D4 A802                <1> 	test	al, INPT_BUF_FULL	; CHECK FOR ITS INPUT BUFFER BUSY
  1333 000013D6 E0FA                <1> 	loopnz	S10			; WAIT FOR COMMAND TO BE ACCEPTED
  1334                              <1> 
  1335 000013D8 6658                <1> 	pop	ax			; GET DATA TO SEND
  1336 000013DA E664                <1> 	out	STATUS_PORT, al		; SEND TO KEYBOARD CONTROLLER
  1337 000013DC FB                  <1> 	sti				; ENABLE INTERRUPTS AGAIN
  1338 000013DD C3                  <1> 	retn				; RETURN TO CALLER
  1339                              <1> 
  1340                              <1> SND_DATA:
  1341                              <1> 	; ---------------------------------------------------------------------------------
  1342                              <1> 	; SND_DATA
  1343                              <1> 	;	THIS ROUTINES HANDLES TRANSMISSION OF COMMAND AND DATA BYTES
  1344                              <1> 	;	TO THE KEYBOARD AND RECEIPT OF ACKNOWLEDGEMENTS. IT ALSO
  1345                              <1> 	;	HANDLES ANY RETRIES IF REQUIRED
  1346                              <1> 	; ---------------------------------------------------------------------------------
  1347                              <1> 	;
  1348 000013DE 6650                <1> 	push	ax			; SAVE REGISTERS
  1349 000013E0 6653                <1> 	push	bx
  1350 000013E2 51                  <1> 	push	ecx
  1351 000013E3 88C7                <1> 	mov	bh, al			; SAVE TRANSMITTED BYTE FOR RETRIES
  1352 000013E5 B303                <1> 	mov	bl, 3			; LOAD RETRY COUNT
  1353                              <1> SD0:
  1354 000013E7 FA                  <1> 	cli				; DISABLE INTERRUPTS
  1355 000013E8 8025[EF5E0000]CF    <1> 	and	byte [KB_FLAG_2], ~(KB_FE+KB_FA) ; CLEAR ACK AND RESEND FLAGS
  1356                              <1> 	;
  1357                              <1> 	;-----	WAIT FOR COMMAND TO BE ACCEPTED
  1358 000013EF B900000100          <1> 	mov	ecx, 10000h		; MAXIMUM WAIT COUNT
  1359                              <1> SD5:
  1360 000013F4 E464                <1> 	in	al, STATUS_PORT		; READ KEYBOARD PROCESSOR STATUS PORT
  1361 000013F6 A802                <1> 	test	al, INPT_BUF_FULL	; CHECK FOR ANY PENDING COMMAND
  1362 000013F8 E0FA                <1> 	loopnz	SD5			; WAIT FOR COMMAND TO BE ACCEPTED
  1363                              <1> 	;
  1364 000013FA 88F8                <1> 	mov	al, bh			; REESTABLISH BYTE TO TRANSMIT
  1365 000013FC E660                <1> 	out	PORT_A, al		; SEND BYTE
  1366 000013FE FB                  <1> 	sti				; ENABLE INTERRUPTS
  1367                              <1> 	;mov	cx, 01A00h		; LOAD COUNT FOR 10 ms+
  1368 000013FF B9FFFF0000          <1> 	mov	ecx, 0FFFFh
  1369                              <1> SD1:
  1370 00001404 F605[EF5E0000]30    <1> 	test	byte [KB_FLAG_2], KB_FE+KB_FA ; SEE IF EITHER BIT SET
  1371 0000140B 750F                <1> 	jnz	short SD3		; IF SET, SOMETHING RECEIVED GO PROCESS
  1372 0000140D E2F5                <1> 	loop	SD1			; OTHERWISE WAIT
  1373                              <1> SD2:
  1374 0000140F FECB                <1> 	dec	bl			; DECREMENT RETRY COUNT
  1375 00001411 75D4                <1> 	jnz	short SD0		; RETRY TRANSMISSION
  1376 00001413 800D[EF5E0000]80    <1> 	or	byte [KB_FLAG_2], KB_ERR ; TURN ON TRANSMIT ERROR FLAG
  1377 0000141A EB09                <1> 	jmp	short SD4		; RETRIES EXHAUSTED FORGET TRANSMISSION
  1378                              <1> SD3:
  1379 0000141C F605[EF5E0000]10    <1> 	test	byte [KB_FLAG_2], KB_FA ; SEE IF THIS IS AN ACKNOWLEDGE
  1380 00001423 74EA                <1> 	jz	short SD2		; IF NOT, GO RESEND
  1381                              <1> SD4:	
  1382 00001425 59                  <1> 	pop	ecx			; RESTORE REGISTERS
  1383 00001426 665B                <1> 	pop	bx
  1384 00001428 6658                <1> 	pop	ax
  1385 0000142A C3                  <1> 	retn				; RETURN, GOOD TRANSMISSION
  1386                              <1> 
  1387                              <1> SND_LED:
  1388                              <1> 	; ---------------------------------------------------------------------------------
  1389                              <1> 	; SND_LED
  1390                              <1> 	;	THIS ROUTINES TURNS ON THE MODE INDICATORS.
  1391                              <1> 	;
  1392                              <1> 	;----------------------------------------------------------------------------------
  1393                              <1> 	;
  1394 0000142B FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1395 0000142C F605[EF5E0000]40    <1> 	test	byte [KB_FLAG_2], KB_PR_LED ; CHECK FOR MODE INDICATOR UPDATE
  1396 00001433 755F                <1> 	jnz 	short SL1		; DON'T UPDATE AGAIN IF UPDATE UNDERWAY
  1397                              <1> 	;
  1398 00001435 800D[EF5E0000]40    <1> 	or	byte [KB_FLAG_2], KB_PR_LED ; TURN ON UPDATE IN PROCESS
  1399 0000143C B020                <1> 	mov	al, EOI			; END OF INTERRUPT COMMAND
  1400 0000143E E620                <1> 	out	20h, al ;out INTA00, al	; SEND COMMAND TO INTERRUPT CONTROL PORT
  1401 00001440 EB11                <1> 	jmp	short SL0		; GO SEND MODE INDICATOR COMMAND
  1402                              <1> SND_LED1:
  1403 00001442 FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1404 00001443 F605[EF5E0000]40    <1> 	test	byte [KB_FLAG_2], KB_PR_LED ; CHECK FOR MODE INDICATOR UPDATE
  1405 0000144A 7548                <1> 	jnz	short SL1		; DON'T UPDATE AGAIN IF UPDATE UNDERWAY
  1406                              <1> 	;
  1407 0000144C 800D[EF5E0000]40    <1> 	or	byte [KB_FLAG_2], KB_PR_LED ; TURN ON UPDATE IN PROCESS
  1408                              <1> SL0:
  1409 00001453 B0ED                <1> 	mov	al, LED_CMD		; LED CMD BYTE
  1410 00001455 E884FFFFFF          <1> 	call	SND_DATA		; SEND DATA TO KEYBOARD
  1411 0000145A FA                  <1> 	cli
  1412 0000145B E836000000          <1> 	call	MAKE_LED		; GO FORM INDICATOR DATA BYTE
  1413 00001460 8025[EF5E0000]F8    <1> 	and	byte [KB_FLAG_2], 0F8h	; ~KB_LEDS ; CLEAR MODE INDICATOR BITS
  1414 00001467 0805[EF5E0000]      <1> 	or	[KB_FLAG_2], al 	; SAVE PRESENT INDICATORS FOR NEXT TIME
  1415 0000146D F605[EF5E0000]80    <1> 	test	byte [KB_FLAG_2], KB_ERR ; TRANSMIT ERROR DETECTED
  1416 00001474 750F                <1> 	jnz	short SL2		; IF SO, BYPASS SECOND BYTE TRANSMISSION
  1417                              <1> 	;
  1418 00001476 E863FFFFFF          <1> 	call	SND_DATA		; SEND DATA TO KEYBOARD
  1419 0000147B FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1420 0000147C F605[EF5E0000]80    <1> 	test	byte [KB_FLAG_2], KB_ERR ; TRANSMIT ERROR DETECTED
  1421 00001483 7408                <1> 	jz	short SL3		; IF NOT, DON'T SEND AN ENABLE COMMAND
  1422                              <1> SL2:
  1423 00001485 B0F4                <1> 	mov	al, KB_ENABLE		; GET KEYBOARD CSA ENABLE COMMAND
  1424 00001487 E852FFFFFF          <1> 	call	SND_DATA		; SEND DATA TO KEYBOARD
  1425 0000148C FA                  <1> 	cli				; TURN OFF INTERRUPTS
  1426                              <1> SL3:
  1427 0000148D 8025[EF5E0000]3F    <1> 	and	byte [KB_FLAG_2], ~(KB_PR_LED+KB_ERR) ; TURN OFF MODE INDICATOR
  1428                              <1> SL1:					; UPDATE AND TRANSMIT ERROR FLAG
  1429 00001494 FB                  <1> 	sti				; ENABLE INTERRUPTS
  1430 00001495 C3                  <1> 	retn				; RETURN TO CALLER
  1431                              <1> 
  1432                              <1> MAKE_LED:
  1433                              <1> 	;---------------------------------------------------------------------------------
  1434                              <1> 	; MAKE_LED
  1435                              <1> 	;	THIS ROUTINES FORMS THE DATA BYTE NECESSARY TO TURN ON/OFF
  1436                              <1> 	;	THE MODE INDICATORS.
  1437                              <1> 	;---------------------------------------------------------------------------------
  1438                              <1> 	;
  1439                              <1> 	;push 	cx			; SAVE CX
  1440 00001496 A0[ED5E0000]        <1> 	mov	al, [KB_FLAG]		; GET CAPS & NUM LOCK INDICATORS
  1441 0000149B 2470                <1> 	and	al, CAPS_STATE+NUM_STATE+SCROLL_STATE ; ISOLATE INDICATORS
  1442                              <1> 	;mov	cl, 4			; SHIFT COUNT
  1443                              <1> 	;rol	al, cl			; SHIFT BITS OVER TO TURN ON INDICATORS
  1444 0000149D C0C004              <1> 	rol	al, 4 ; 20/02/2015
  1445 000014A0 2407                <1> 	and	al, 07h			; MAKE SURE ONLY MODE BITS ON
  1446                              <1> 	;pop	cx
  1447 000014A2 C3                  <1> 	retn				; RETURN TO CALLER
  1448                              <1> 
  1449                              <1> ; % include 'kybdata.s'   ; KEYBOARD DATA
  1450                              <1> 
  1451                              <1> 
  1452                              <1> ; /// End Of KEYBOARD FUNCTIONS ///
  1940                                  
  1941                                  %include 'video.s' ; 07/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - video.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 09/12/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 16/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; video.inc (13/08/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-AT' BIOS source code (1985) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - VIDEO.INC
    20                              <1> ; Last Modification: 13/08/2015
    21                              <1> ;		  (Video Data is in 'VIDATA.INC')
    22                              <1> ;
    23                              <1> ; ///////// VIDEO (CGA) FUNCTIONS ///////////////
    24                              <1> 
    25                              <1> ; 16/01/2016 (32 bit modifications, TRDOS386 - TRDOS v2.0, video.s)
    26                              <1> ; INT 31H (TRDOS 386) = INT 10H (IBM PC/AT REAL MODE)
    27                              <1> 
    28                              <1> ; IBM PC-AT BIOS Source Code
    29                              <1> ; TITLE VIDEO1 --- 06/10/85  VIDEO DISPLAY BIOS
    30                              <1> 
    31                              <1> _int10h:
    32                              <1> 	; 23/03/2016
    33                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
    34 000014A3 9C                  <1> 	pushfd
    35 000014A4 0E                  <1> 	push 	cs
    36 000014A5 E851000000          <1> 	call 	VIDEO_IO_1
    37 000014AA C3                  <1> 	retn
    38                              <1> 
    39                              <1> ;--- INT 10 H -------------------------------------------------------------------
    40                              <1> ; VIDEO_IO									:	
    41                              <1> ;	THESE ROUTINES PROVIDE THE CRT DISPLAY INTERFACE			:
    42                              <1> ;	THE FOLLOWING FUNCTIONS ARE PROVIDED:					:
    43                              <1> ;										:
    44                              <1> ;    (AH)= 00H	SET MODE (AL) CONTAINS MODE VALUE				:
    45                              <1> ;		(AL) = 00H  40X25 BW MODE (POWER ON DEFAULT)			:
    46                              <1> ;		(AL) = 01H  40X25 COLOR						:
    47                              <1> ;		(AL) = 02H  80X25 BW						:
    48                              <1> ;		(AL) = 03H  80X25 COLOR						:
    49                              <1> ;		              GRAPHICS MODES					:
    50                              <1> ;		(AL) = 04H  320X200 COLOR					:
    51                              <1> ;		(AL) = 05H  320X200 BW MODE					:
    52                              <1> ;		(AL) = 06H  640X200 BW MODE					:
    53                              <1> ;		(AL) = 07H   80X25 MONOCHROME (USED INTERNAL TO VIDEO ONLY)	:
    54                              <1> ;		*** NOTES -BW MODES OPERATE SAME AS COLOR MODES, BUT COLOR	:
    55                              <1> ;		           BURST IS NOT ENABLED					:
    56                              <1> ;		          -CURSOR IS NOT DISPLAYED IN GRAPHICS MODE		:
    57                              <1> ;    (AH)= 01H	SET CURSOR TYPE							:
    58                              <1> ;		(CH) = BITS 4-0 = START LINE FOR CURSOR				:
    59                              <1> ;		       ** HARDWARE WILL ALWAYS CAUSE BLINK			:
    60                              <1> ;		       ** SETTING BIT 5 OR 6 WILL CAUSE ERRATIC BLINKING	:
    61                              <1> ;		          OR NO CURSOR AT ALL					:
    62                              <1> ;		(CL) = BITS 4-0 = END LINE FOR CURSOR				:
    63                              <1> ;    (AH)= 02H	SET CURSOR POSITION						:
    64                              <1> ;		(DH,DL) = ROW,COLUMN  (00H,00H) IS UPPER LEFT			:
    65                              <1> ;		(BH) = A PAGE NUMBER (MUST BE 00H FOR GRAPHICS MODES)		:
    66                              <1> ;    (AH)= 03H	READ CURSOR POSITION						:
    67                              <1> ;		(BH) = PAGE NUMBER (MUST BE 00H FOR GRAPHICS MODES)		:
    68                              <1> ;		ON EXIT (DH,DL) = ROW,COLUMN OF CURRENT CURSOR			:
    69                              <1> ;		        (CH,CL) = CURSOR MODE CURRENTLY SET			:
    70                              <1> ;    (AH)= 04H	READ LIGHT PEN POSITION						:
    71                              <1> ;		ON EXIT:							:
    72                              <1> ;		(AH) = 00H -- LIGHT PEN SWITCH NOT DOWN/NOT TRIGGERED		:
    73                              <1> ;		(AH) = 01H -- VALID LIGHT PEN VALUE IN REGISTERS		:
    74                              <1> ;		        (DH,DL) = ROW,COLUMN OF CHARACTER LP POSITION		:
    75                              <1> ;		        (CH) = RASTER LINE (0-199)				:
    76                              <1> ;		        (BX) = PIXEL COLUMN (0-319,639)				:
    77                              <1> ;    (AH)= 05H	SELECT ACTIVE DISPLAY PAGE (VALID ONLY FOR ALPHA MODES)		:
    78                              <1> ;		(AL) = NEW PAGE VALUE (0-7 FOR MODES 0&1, 0-3 FOR MODES 2&3)	:
    79                              <1> ;    (AH)= 06H	SCROLL ACTIVE PAGE UP						:
    80                              <1> ;		(AL) = NUMBER OF LINES. ( LINES BLANKED AT BOTTOM OF WINDOW )	:
    81                              <1> ;		        (AL) = 00H MEANS BLANK ENTIRE WINDOW			:
    82                              <1> ;		(CH,CL) = ROW,COLUMN OF UPPER LEFT CORNER OF SCROLL		:
    83                              <1> ;		(DH,DL) = ROW,COLUMN OF LOWER RIGHT CORNER OF SCROLL		:
    84                              <1> ;		(BH) = ATTRIBUTE TO BE USED ON BLANK LINE			:
    85                              <1> ;    (AH)= 07H	SCROLL ACTIVE PAGE DOWN						:
    86                              <1> ;		(AL) = NUMBER OF LINES, INPUT LINES BLANKED AT TOP OF WINDOW	:
    87                              <1> ;		        (AL) = 00H MEANS BLANK ENTIRE WINDOW			:
    88                              <1> ;		(CH,CL) = ROW,COLUMN OF UPPER LEFT CORNER OF SCROLL		:
    89                              <1> ;		(DH,DL) = ROW,COLUMN OF LOWER RIGHT CORNER OF SCROLL		:
    90                              <1> ;		(BH) = ATTRIBUTE TO BE USED ON BLANK LINE			:
    91                              <1> ;										:
    92                              <1> ;   CHARACTER HANDLING ROUTINES							:
    93                              <1> ;										:
    94                              <1> ;    (AH)= 08H	READ ATTRIBUTE/CHARACTER AT CURRENT CURSOR POSITION		:
    95                              <1> ;		(BH) = DISPLAY PAGE (VALID FOR ALPHA MODES ONLY)		:
    96                              <1> ;		ON EXIT:							:
    97                              <1> ;		(AL) = CHAR READ						:
    98                              <1> ;		(AH) = ATTRIBUTE OF CHARACTER READ (ALPHA MODES ONLY)		:
    99                              <1> ;    (AH)= 09H	WRITE ATTRIBUTE/CHARACTER AT CURRENT CURSOR POSITION		:
   100                              <1> ;		(BH) = DISPLAY PAGE (VALID FOR ALPHA MODES ONLY)		:
   101                              <1> ;		(CX) = COUNT OF CHARACTERS TO WRITE				:
   102                              <1> ;		(AL) = CHAR TO WRITE						:
   103                              <1> ;		(BL) = ATTRIBUTE OF CHARACTER (ALPHA)/COLOR OF CHAR (GRAPHICS)	:
   104                              <1> ;		         SEE NOTE ON WRITE DOT FOR BIT 7 OF BL = 1.		:
   105                              <1> ;    (AH) = 0AH	WRITE CHARACTER ONLY AT CURRENT CURSOR POSITION			:
   106                              <1> ;		(BH) = DISPLAY PAGE (VALID FOR ALPHA MODES ONLY)		:
   107                              <1> ;		(CX) = COUNT OF CHARACTERS TO WRITE				:
   108                              <1> ;		(AL) = CHAR TO WRITE						:
   109                              <1> ;		       NOTE: USE FUNCTION (AH)= 09H IN GRAPHICS MODES		:
   110                              <1> ;	FOR READ/WRITE CHARACTER INTERFACE WHILE IN GRAPHICS MODE, THE		:
   111                              <1> ;		CHARACTERS ARE FORMED FROM A CHARACTER GENERATOR IMAGE		:
   112                              <1> ;		MAINTAINED IN THE SYSTEM ROM. ONLY THE 1ST 128 CHARS		:
   113                              <1> ;		ARE CONTAINED THERE. TO READ/WRITE THE SECOND 128 CHARS,	:
   114                              <1> ;		THE USER MUST INITIALIZE THE POINTER AT INTERRUPT 1FH		:
   115                              <1> ;		(LOCATION 0007CH) TO POINT TO THE 1K BYTE TABLE CONTAINING	:
   116                              <1> ;		THE CODE POINTS FOR THE SECOND 128 CHARS (128-255).		:
   117                              <1> ;	FOR WRITE CHARACTER INTERFACE IN GRAPHICS MODE, THE REPLICATION FACTOR	:
   118                              <1> ;		CONTAINED IN (CX) ON ENTRY WILL PRODUCE VALID RESULTS ONLY	:
   119                              <1> ;		FOR CHARACTERS CONTAINED ON THE SAME ROW. CONTINUATION TO	:
   120                              <1> ;		SUCCEEDING LINES WILL NOT PRODUCE CORRECTLY.			:
   121                              <1> ;										:
   122                              <1> ;    GRAPHICS INTERFACE								:
   123                              <1> ;    (AH)= 0BH	SET COLOR PALETTE						:
   124                              <1> ;		(BH) = PALETTE COLOR ID BEING SET (0-127)			:
   125                              <1> ;		(BL) = COLOR VALUE TO BE USED WITH THAT COLOR ID		:
   126                              <1> ;		       NOTE: FOR THE CURRENT COLOR CARD, THIS ENTRY POINT HAS	:
   127                              <1> ;		               MEANING ONLY FOR 320X200 GRAPHICS.		:
   128                              <1> ;		       COLOR ID = 0 SELECTS THE BACKGROUND COLOR (0-15)		:
   129                              <1> ;		       COLOR ID = 1 SELECTS THE PALETTE TO BE USED:		:
   130                              <1> ;		               0 = GREEN(1)/RED(2)/YELLOW(3)			:
   131                              <1> ;		               1 = CYAN(1)/MAGENTA(2)/WHITE(3)			:
   132                              <1> ;		       IN 40X25 OR 80X25 ALPHA MODES, THE VALUE SET FOR 	:
   133                              <1> ;		               PALETTE COLOR 0 INDICATES THE BORDER COLOR	:
   134                              <1> ;		               TO BE USED (VALUES 0-31, WHERE 16-31 SELECT	:
   135                              <1> ;		               THE HIGH INTENSITY BACKGROUND SET.		:
   136                              <1> ;    (AH)= 0CH	WRITE DOT							:
   137                              <1> ;		(DX) = ROW NUMBER						:
   138                              <1> ;		(CX) = COLUMN NUMBER						:
   139                              <1> ;		(AL) = COLOR VALUE						:
   140                              <1> ;		        IF BIT 7 OF AL = 1, THEN THE COLOR VALUE IS EXCLUSIVE	:
   141                              <1> ;		        ORed WITH THE CURRENT CONTENTS OF THE DOT		:
   142                              <1> ;    (AH)= ODH	READ DOT							:
   143                              <1> ;		(DX) = ROW NUMBER						:
   144                              <1> ;		(CX) = COLUMN NUMBER						:
   145                              <1> ;		(AL) = RETURNS THE DOT READ					:
   146                              <1> ;										:
   147                              <1> ;    ASCII TELETYPE ROUTINE FOR OUTPUT						:
   148                              <1> ;										:
   149                              <1> ;    (AH)= 0EH	WRITE TELETYPE TO ACTIVE PAGE					:
   150                              <1> ;		(AL) = CHAR TO WRITE						:
   151                              <1> ;		(BL) = FOREGROUND COLOR IN GRAPHICS MODE			:
   152                              <1> ;		NOTE -- SCREEN WIDTH IS CONTROLLED BY PREVIOUS MODE SET		:
   153                              <1> ;    (AH)= 0FH	CURRENT VIDEO STATE						:
   154                              <1> ;		RETURNS THE CURRENT VIDEO STATE					:
   155                              <1> ;		(AL) = MODE CURRENTLY SET ( SEE (AH)=00H FOR EXPLANATION)	:
   156                              <1> ;		(AH) = NUMBER OR CHARACTER COLUMNS ON SCREEN			:
   157                              <1> ;		(BH) = CURRENT ACTIVE DISPLAY PAGE				:
   158                              <1> ;    (AH)= 10H	RESERVED							:
   159                              <1> ;    (AH)= 11H	RESERVED							:
   160                              <1> ;    (AH)= 12H	RESERVED							:
   161                              <1> ;    (AH)= 13H	WRITE STRING							:
   162                              <1> ;			ES:BP  -  POINTER T0 STRING TO BE WRITTEN		:
   163                              <1> ;			CX     -  LENGTH OF CHARACTER STRING TO WRITTEN		:
   164                              <1> ;			DX     -  CURSOR POSITION FOR STRING TO BE WRITTEN	:
   165                              <1> ;			BH     -  PAGE NUMBER					:
   166                              <1> ;		(AL)= 00H	WRITE CHARACTER STRING				:
   167                              <1> ;			BL     -  ATTRIBUTE					:
   168                              <1> ;			STRING IS  <CHAR,CHAR, ... ,CHAR>			:
   169                              <1> ;			CURSOR NOT MOVED					:
   170                              <1> ;		(AL)= 01H	WRITE CHARACTER STRING AND MOVE CURSOR		:
   171                              <1> ;			BL     -  ATTRIBUTE					:
   172                              <1> ;			STRING IS  <CHAR,CHAR, ... ,CHAR>			:
   173                              <1> ;			CURSOR MOVED						:
   174                              <1> ;		(AL)= 02H	WRITE CHARACTER AND ATTRIBUTE STRING		:
   175                              <1> ;			       (VALID FOR ALPHA MODES ONLY)			:
   176                              <1> ;			STRING IS <CHAR,ATTR,CHAR,ATTR ..  ,CHAR,ATTR>		:
   177                              <1> ;			CURSOR IS NOT MOVED					:
   178                              <1> ;		(AL)= 03H WRITE CHARACTER AND ATTRIBUTE STRING AND MOVE CURSOR	:
   179                              <1> ;			       (VALID FOR ALPHA MODES ONLY)			:
   180                              <1> ;			STRING IS <CHAR,ATTR,CHAR,ATTR ..  ,CHAR,ATTR>		:
   181                              <1> ;			CURSOR IS MOVED						:
   182                              <1> ;		 NOTE:  CARRIAGE RETURN, LINE FEED, BACKSPACE, AND BELL ARE	:
   183                              <1> ;		        TREATED AS COMMANDS RATHER THAN PRINTABLE CHARACTERS.	:
   184                              <1> ;										:
   185                              <1> ;	BX,CX,DX,SI,DI,BP,SP,DS,ES,SS PRESERVED DURING CALLS EXCEPT FOR		:
   186                              <1> ;	BX,CX,DX RETURN VALUES ON FUNCTIONS 03H,04H,0DH AND 0FH. ON ALL CALLS	:
   187                              <1> ;	AX IS MODIFIED.								:
   188                              <1> ;--------------------------------------------------------------------------------
   189                              <1> 
   190 000014AB [58150000]          <1> M1:	dd	SET_MODE	; TABLE OF ROUTINES WITHIN VIDEO I/O
   191 000014AF [C0180000]          <1> 	dd	SET_CTYPE
   192 000014B3 [F4180000]          <1> 	dd	SET_CPOS
   193 000014B7 [1C190000]          <1> 	dd	READ_CURSOR
   194                              <1> 	;dd	VIDEO_RETURN	; READ_LPEN
   195 000014BB [41150000]          <1> 	dd	set_mode_ncm	; Set mode without clearing video memory
   196 000014BF [62190000]          <1> 	dd	ACT_DISP_PAGE
   197 000014C3 [F9190000]          <1> 	dd	SCROLL_UP
   198 000014C7 [1D1B0000]          <1> 	dd	SCROLL_DOWN
   199 000014CB [9E1B0000]          <1> 	dd	READ_AC_CURRENT
   200 000014CF [F61B0000]          <1> 	dd	WRITE_AC_CURRENT
   201 000014D3 [1C1C0000]          <1> 	dd	WRITE_C_CURRENT
   202 000014D7 [42250000]          <1> 	dd	SET_COLOR
   203 000014DB [AD250000]          <1> 	dd	WRITE_DOT
   204 000014DF [78250000]          <1> 	dd	READ_DOT
   205 000014E3 [9E1C0000]          <1> 	dd	WRITE_TTY
   206 000014E7 [29150000]          <1> 	dd	VIDEO_STATE
   207 000014EB [F82E0000]          <1> 	dd	vga_pal_funcs ; 10/08/2016 (TRDOS 386)
   208 000014EF [AE2A0000]          <1> 	dd	font_setup    ; 10/07/2016 (TRDOS 386)
   209 000014F3 [5D150000]          <1> 	dd	VIDEO_RETURN	; RESERVED
   210 000014F7 [0B1E0000]          <1> 	dd	WRITE_STRING  ; 23/06/2016 (TRDOS 386)
   211                              <1> M1L	EQU	$ - M1
   212                              <1> 
   213                              <1> ; 14/01/2017
   214                              <1> ; 02/01/2017
   215                              <1> ; 04/07/2016
   216                              <1> ; 12/05/2016
   217                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   218                              <1> int31h:  ; Video BIOS
   219                              <1> 
   220                              <1> ; BH = Video page number
   221                              <1> ; BL = Color/Attribute
   222                              <1> ; AH = Function number
   223                              <1> ; AL = Character
   224                              <1> 
   225                              <1> VIDEO_IO_1:
   226                              <1> 	;sti				; INTERRUPTS BACK ON
   227 000014FB FC                  <1> 	cld				; SET DIRECTION FORWARD
   228 000014FC 80FC14              <1> 	cmp	ah, M1L/4		; TEST FOR WITHIN TABLE RANGE
   229 000014FF 7327                <1> 	jnb	short M4		; BRANCH TO EXIT IF NOT A VALID COMMAND
   230                              <1> 
   231 00001501 06                  <1> 	push	es
   232 00001502 1E                  <1> 	push	ds			; SAVE WORK AND PARAMETER REGISTERS
   233 00001503 52                  <1> 	push	edx
   234 00001504 51                  <1> 	push	ecx
   235 00001505 53                  <1> 	push	ebx
   236 00001506 56                  <1> 	push	esi
   237 00001507 57                  <1> 	push	edi
   238 00001508 55                  <1> 	push	ebp
   239                              <1> 
   240 00001509 66BE1000            <1> 	mov	si, KDATA 		; POINT DS: TO DATA SEGMENT
   241 0000150D 8EDE                <1> 	mov	ds, si
   242 0000150F 8EC6                <1> 	mov	es, si
   243 00001511 BF00800B00          <1> 	mov	edi, 0B8000h		; GET offset FOR COLOR CARD
   244 00001516 A3[48650100]        <1> 	mov	[video_eax], eax ; 12/05/2016 
   245                              <1> 	; 23/03/2016
   246 0000151B C0E402              <1> 	shl	ah, 2  ; dword		; TIMES 2 FOR WORD TABLE LOOKUP
   247 0000151E 0FB6F4              <1> 	movzx	esi, ah			; MOVE OFFSET INTO LOOK UP REGISTER (SI)
   248                              <1> 	;mov	ah, [CRT_MODE]		; MOVE CURRENT MODE INTO (AH) REGISTER
   249                              <1> 
   250                              <1> 	;;15/01/2017
   251                              <1> 	; 14/01/2017
   252                              <1> 	; 02/01/2017
   253                              <1> 	;;mov	byte [intflg], 31h  ; video interrupt
   254 00001521 FB                  <1> 	sti
   255                              <1> 	;
   256                              <1> 
   257 00001522 FFA6[AB140000]      <1> 	JMP	dword [esi+M1]		; GO TO SELECTED FUNCTION
   258                              <1> 
   259                              <1> M4:					; COMMAND NOT VALID
   260 00001528 CF                  <1> 	iretd				; DO NOTHING IF NOT IN VALID RANGE
   261                              <1> 
   262                              <1> VIDEO_STATE:
   263                              <1> 	; 26/06/2016
   264                              <1> 	; 12/05/2016
   265                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   266                              <1> 
   267                              <1> ;---------------------------------------------------
   268                              <1> ; VIDEO STATE
   269                              <1> ;  RETURNS THE CURRENT VIDEO STATE IN AX
   270                              <1> ;  AH = NUMBER OF COLUMNS ON THE SCREEN
   271                              <1> ;  AL = CURRENT VIDEO MODE
   272                              <1> ;  BH = CURRENT ACTIVE PAGE
   273                              <1> ;---------------------------------------------------
   274                              <1> 
   275 00001529 8A25[245F0000]      <1> 	mov	ah, [CRT_COLS]	; GET NUMBER OF COLUMNS
   276 0000152F A0[225F0000]        <1> 	mov	al, [CRT_MODE]	; CURRENT MODE
   277                              <1> 	;movzx	esi, al
   278                              <1> 	;mov	ah, [esi+M6] 
   279                              <1> 	; BH = active page
   280 00001534 8A3D[EE580100]      <1> 	mov	bh, [ACTIVE_PAGE] ; GET CURRENT ACTIVE PAGE
   281 0000153A FA                  <1> 	cli	; 02/01/2017
   282 0000153B 5D                  <1> 	pop	ebp		; RECOVER REGISTERS
   283 0000153C 5F                  <1> 	pop	edi
   284 0000153D 5E                  <1> 	pop	esi
   285 0000153E 59                  <1> 	pop	ecx		; DISCARD SAVED BX
   286 0000153F EB26                <1> 	jmp	short M15	; RETURN TO CALLER
   287                              <1> 
   288                              <1> set_mode_ncm:
   289                              <1> 	; 04/07/2016 - TRDOS 386 (TRDOS v2.0)
   290                              <1> 	; set mode without clearing the video memory
   291                              <1> 	; (ony for graphics modes)
   292 00001541 3C07                <1> 	cmp	al, 7 ; IBM PC CGA modes
   293 00001543 7613                <1> 	jna	short SET_MODE ; normal function (clear)
   294                              <1> 	; do not clear memory
   295 00001545 A2[57650100]        <1> 	mov	[noclearmem], al ; > 0
   296 0000154A E81F000000          <1> 	call	_set_mode
   297 0000154F C605[57650100]00    <1> 	mov	byte [noclearmem], 0
   298 00001556 EB05                <1>         jmp     short VIDEO_RETURN
   299                              <1> 
   300                              <1> 	; 10/08/2016
   301                              <1> 	; 08/08/2016
   302                              <1> 	; 30/07/2016
   303                              <1> 	; 29/07/2016
   304                              <1> 	; 27/07/2016
   305                              <1> 	; 26/07/2016
   306                              <1> 	; 25/07/2016
   307                              <1> 	; 23/07/2016
   308                              <1> 	; 18/07/2016
   309                              <1> 	; 02/07/2016
   310                              <1> 	; 26/06/2016
   311                              <1> 	; 24/06/2016
   312                              <1> 	; 29/05/2016 - TRDOS 386 (TRDOS v2.0)
   313                              <1> SET_MODE:
   314                              <1> 	; For 32 bit TRDOS and Retro UNIX 386:
   315                              <1> 	;	valid video mode: 03h only!
   316                              <1> 	;	(VGA modes will be selected with another routine)
   317                              <1> 	;
   318                              <1> 	; set_txt_mode ; 80*25 (16 fore colors, 8 back colors)
   319                              <1> 
   320                              <1> ;------------------------------------------------------
   321                              <1> ; SET MODE					      :
   322                              <1> ;	THIS ROUTINE INITIALIZES THE ATTACHMENT TO    :
   323                              <1> ;	THE SELECTED MODE, THE SCREEN IS BLANKED.     :
   324                              <1> ; INPUT						      :
   325                              <1> ;	(AL) - MODE SELECTED (RANGE 0-7)	      :
   326                              <1> ; OUTPUT					      :
   327                              <1> ;	NONE					      :
   328                              <1> ;------------------------------------------------------
   329                              <1> 
   330 00001558 E811000000          <1> 	call	_set_mode ; 24/06/2016 (set_txt_mode)
   331                              <1> 
   332                              <1> ; 12/05/2016
   333                              <1> ; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   334                              <1> 
   335                              <1> ;-----	NORMAL RETURN FROM ALL VIDEO RETURNS
   336                              <1> 
   337                              <1> VIDEO_RETURN:
   338 0000155D A1[48650100]        <1> 	mov	eax, [video_eax] ; 12/05/2016
   339                              <1> _video_return:
   340 00001562 FA                  <1> 	cli ; 02/01/2017
   341 00001563 5D                  <1> 	pop	ebp
   342 00001564 5F                  <1> 	pop	edi
   343 00001565 5E                  <1> 	pop	esi
   344 00001566 5B                  <1> 	pop	ebx
   345                              <1> M15:	; VIDEO_RETURN_C
   346                              <1> 	;;15/01/2017
   347                              <1> 	; 02/01/2017
   348                              <1> 	;;mov	byte [intflg], 0
   349                              <1> 	;
   350 00001567 59                  <1> 	pop	ecx
   351 00001568 5A                  <1> 	pop	edx
   352 00001569 1F                  <1> 	pop	ds
   353 0000156A 07                  <1> 	pop	es	; RECOVER SEGMENTS
   354 0000156B CF                  <1> 	iretd		; ALL DONE
   355                              <1> 
   356                              <1> set_txt_mode:
   357                              <1> 	; 29/07/2016
   358                              <1> 	; 27/06/2016
   359 0000156C B003                <1> 	mov	al, 3
   360                              <1> 
   361                              <1> ; 10/08/2016
   362                              <1> ; 08/08/2016
   363                              <1> ; 30/07/2016
   364                              <1> ; 29/07/2016
   365                              <1> ; 27/07/2016
   366                              <1> ; 26/07/2016
   367                              <1> ; 25/07/2016
   368                              <1> ; 23/07/2016
   369                              <1> ; 18/07/2016
   370                              <1> ; 07/07/2016
   371                              <1> ; 04/07/2016
   372                              <1> ; 03/07/2016
   373                              <1> ; 02/07/2016
   374                              <1> ; 26/06/2016
   375                              <1> ; 24/06/2016 (set_txt_mode -> _set_mode)
   376                              <1> ; 17/06/2016
   377                              <1> ; 29/05/2016
   378                              <1> ; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   379                              <1> _set_mode:
   380                              <1> 	; 24/06/2016
   381 0000156E 3805[225F0000]      <1> 	cmp	[CRT_MODE], al  ; current mode = requested mode ?
   382 00001574 750D                <1> 	jne	short _sm_0
   383 00001576 3C03                <1> 	cmp	al, 3		; text, 80*25 color, default mode
   384                              <1> 				; for TRDOS 386 MainProg
   385 00001578 755F                <1>         jne     short _sm_2	;  multiscreen is only for mode 3
   386                              <1> 
   387                              <1> 	; If '_set_mode' procedure is called for video mode 3
   388                              <1> 	;     while video mode is 3, video page will be cleared
   389                              <1> 	;     and cursor position of video page will be reset.	  
   390                              <1> 	
   391                              <1> 	; 29/07/2016
   392 0000157A 800D[55650100]80    <1> 	or	byte [p_crt_mode], 80h ; clear page indicator
   393 00001581 EB5B                <1>         jmp     short _sm_3
   394                              <1> _sm_0:  
   395 00001583 803D[225F0000]03    <1> 	cmp	byte [CRT_MODE], 3
   396 0000158A 7534                <1>         jne     short _sm_1
   397                              <1> 
   398                              <1> 	; If '_set_mode' procedure is called for a video mode
   399                              <1> 	;     except video mode 3, while current video mode
   400                              <1> 	;     is 3; all video pages of mode 3 will be copied 
   401                              <1> 	;     to 98000h address as backup, before mode change.	
   402                              <1> 
   403                              <1> _sm_save_pm:
   404                              <1> 	; 03/07/2016
   405                              <1> 	; save video pages
   406 0000158C BE00800B00          <1> 	mov	esi, 0B8000h
   407 00001591 BF00800900          <1> 	mov	edi, 98000h ; 30/07/2016
   408 00001596 B900200000          <1> 	mov	ecx, (0B8000h-0B0000h)/4
   409 0000159B F3A5                <1> 	rep	movsd
   410                              <1> 
   411 0000159D C605[55650100]03    <1> 	mov	byte [p_crt_mode], 3 ; previous mode, backup sign
   412                              <1> 	;mov	cl, [ACTIVE_PAGE]
   413                              <1> 	;mov	[p_crt_page], cl
   414                              <1> 
   415                              <1> 	; save cursor positions
   416 000015A4 BE[DE580100]        <1> 	mov	esi, CURSOR_POSN
   417 000015A9 BF[5A650100]        <1> 	mov	edi, cursor_pposn    ; cursor positions backup
   418 000015AE B104                <1> 	mov	cl, 4
   419 000015B0 F3A5                <1> 	rep	movsd
   420                              <1> 
   421                              <1> 	; 29/07/2016
   422                              <1> 	;mov	[ACTIVE_PAGE], cl ; 0
   423 000015B2 860D[EE580100]      <1> 	xchg	cl, [ACTIVE_PAGE]
   424 000015B8 880D[56650100]      <1> 	mov	[p_crt_page], cl     ; previous page (for mode 3)	
   425                              <1> 	; [ACTIVE_PAGE] = 0 
   426 000015BE EB19                <1> 	jmp	short _sm_2
   427                              <1> 
   428                              <1> _sm_1:
   429 000015C0 3C03                <1> 	cmp	al, 3		; text, 80*25 color, default mode
   430                              <1> 				; for TRDOS 386 MainProg
   431 000015C2 7515                <1> 	jne	short _sm_2  ;  multiscreen is only for mode 3
   432                              <1> 
   433                              <1> 	; If '_set_mode' procedure is called for video mode 3
   434                              <1> 	;     while video mode is not 3 and if there is video
   435                              <1> 	;     page backup for video mode 3, all (of 8) mode 3
   436                              <1> 	;     video pages will be restored from 98000h.
   437                              <1> 
   438 000015C4 803D[55650100]03    <1> 	cmp	byte [p_crt_mode], 3 ; previous mode, backup sign
   439 000015CB 750C                <1> 	jne	short _sm_2 ; there is no (multiscreen) video pages
   440                              <1> 			 ; to be restored
   441 000015CD 8A0D[56650100]      <1> 	mov	cl, [p_crt_page]
   442 000015D3 880D[EE580100]      <1> 	mov	[ACTIVE_PAGE], cl
   443                              <1> 
   444                              <1> _sm_2:
   445 000015D9 A2[225F0000]        <1> 	mov	[CRT_MODE], al  ; save mode in global variable
   446                              <1> _sm_3:
   447                              <1> 	; 30/07/2016
   448                              <1> 	; 26/07/2016
   449                              <1> 	; 25/07/2016
   450                              <1> 	; set_mode_vga:
   451                              <1> 	; 18/07/2016
   452                              <1> 	; 14/07/2016
   453                              <1> 	; 09/07/2016
   454                              <1> 	; 04/07/2016
   455                              <1> 	; 03/07/2016 (TRDOS 386 = TRDOS v2.0)
   456                              <1> 	; /// video mode 13h ///
   457                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
   458                              <1> 	; vgabios-0.7a (2011)
   459                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
   460                              <1> 	; 'vgabios.c', 'vgatables.h'
   461                              <1> 	;
   462                              <1> 	; Oracle VirtualBox 5.0.24 VGABios Source Code
   463                              <1> 	; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
   464                              <1> 	;
   465 000015DE 88C4                <1> 	mov	ah, al
   466 000015E0 B910000000          <1> 	mov	ecx, vga_mode_count 	
   467 000015E5 BE[3E5F0000]        <1> 	mov	esi, vga_modes
   468 000015EA 31DB                <1> 	xor	ebx, ebx
   469                              <1> _sm_4:
   470 000015EC AC                  <1> 	lodsb
   471 000015ED 38C4                <1> 	cmp	ah, al
   472 000015EF 740C                <1> 	je	short _sm_5
   473 000015F1 FEC3                <1> 	inc	bl
   474 000015F3 E2F7                <1> 	loop	_sm_4
   475                              <1> 
   476                              <1> 	; UNIMPLEMENTED VIDEO MODE !
   477 000015F5 31C0                <1> 	xor	eax, eax
   478 000015F7 A3[48650100]        <1>         mov     [video_eax], eax ; 0 
   479 000015FC C3                  <1> 	retn
   480                              <1> 
   481                              <1> ;-----	eBX POINTS TO CORRECT ROW OF INITIALIZATION TABLE	
   482                              <1> 
   483                              <1> _sm_5: 	; 25/07/2016
   484 000015FD 89DE                <1> 	mov	esi, ebx
   485 000015FF 81C6[8E5F0000]      <1> 	add	esi, vga_memmodel
   486 00001605 8A06                <1> 	mov	al, [esi]
   487 00001607 A2[6E650100]        <1> 	mov	[VGA_MTYPE], al
   488                              <1> 
   489 0000160C 89DF                <1> 	mov	edi, ebx
   490 0000160E 81C7[9E5F0000]      <1> 	add	edi, vga_dac_s 	
   491 00001614 C0E302              <1> 	shl	bl, 2 ; byte -> dword
   492 00001617 81C3[4E5F0000]      <1> 	add	ebx, vga_mode_tbl_ptr
   493                              <1> 
   494                              <1> 	;mov	dword [VGA_BASE], 0B8000h
   495                              <1> 	;cmp	ah, 0Dh ; [CRT_MODE]
   496                              <1> 	;jb	short M9 
   497                              <1> 	;mov	dword [VGA_BASE], 0A0000h
   498                              <1> ;M9:
   499 0000161D 8B33                <1> 	mov	esi, [ebx]
   500 0000161F 89F3                <1> 	mov	ebx, esi
   501 00001621 83C614              <1> 	add	esi, vga_p_cm_pos ; ebx + 20
   502 00001624 668B06              <1> 	mov	ax, [esi]       ; get the cursor mode from the table
   503 00001627 66A3[3B5F0000]      <1> 	mov	[CURSOR_MODE], ax ; save cursor mode (initial value)
   504                              <1> 	; al = 6, ah = 7
   505                              <1> 	; al = 0Dh, ah = 0Eh ; 25/07/2016
   506 0000162D E83B020000          <1> 	call	cursor_shape_fix
   507                              <1> 	; al = 14, ah = 15  (If [CHAR_HEIGHT] = 16)
   508 00001632 668906              <1> 	mov	[esi], ax
   509                              <1> 
   510 00001635 56                  <1> 	push	esi ; *	
   511                              <1> 
   512 00001636 8A25[295F0000]      <1> 	mov	ah, [VGA_MODESET_CTL]
   513 0000163C 80E408              <1> 	and	ah, 8 ; default palette loading ?
   514 0000163F 7524                <1> 	jnz	short _sm_6
   515 00001641 66BAC603            <1> 	mov	dx, 3C6h ; VGAREG_PEL_MASK (DAC mask register)
   516 00001645 B0FF                <1> 	mov	al, 0FFh ; PEL mask
   517 00001647 EE                  <1> 	out	dx, al
   518 00001648 8A27                <1> 	mov	ah, [edi] ; DAC model (selection number)
   519 0000164A E8ED0F0000          <1> 	call	load_dac_palette
   520                              <1> 	; ecx = 0
   521 0000164F F605[295F0000]02    <1> 	test	byte [VGA_MODESET_CTL], 2 ; gray scale summing
   522 00001656 740D                <1> 	jz	short _sm_6
   523 00001658 53                  <1> 	push	ebx
   524 00001659 29DB                <1> 	sub	ebx, ebx ; sub bl, bl
   525 0000165B 66B90001            <1>         mov     cx, 256 
   526 0000165F E82B100000          <1> 	call	gray_scale_summing
   527 00001664 5B                  <1> 	pop	ebx	
   528                              <1> _sm_6:
   529                              <1> 	; Reset Attribute Ctl flip-flop
   530 00001665 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
   531 00001669 EC                  <1>  	in	al, dx
   532                              <1> 	; Set Attribute Ctl
   533 0000166A 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
   534 0000166C 83C623              <1> 	add	esi, 35  ; actl regs
   535 0000166F 30E4                <1> 	xor	ah, ah ; 0
   536 00001671 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
   537                              <1> _sm_7:
   538 00001675 88E0                <1> 	mov	al, ah
   539 00001677 EE                  <1> 	out	dx, al ; index
   540 00001678 AC                  <1> 	lodsb
   541                              <1> 	; DX = 3C0h = VGAREG_ACTL_WRITE_DATA
   542 00001679 EE                  <1> 	out	dx, al ; value
   543 0000167A FEC4                <1> 	inc	ah
   544 0000167C 80FC14              <1> 	cmp	ah, 20 ; number of actl registers
   545 0000167F 72F4                <1> 	jb	short _sm_7
   546                              <1> 	;
   547 00001681 88E0                <1> 	mov	al, ah ; 20
   548 00001683 EE                  <1> 	out	dx, al ; index
   549 00001684 28C0                <1> 	sub	al, al ; 0
   550 00001686 EE                  <1> 	out	dx, al ; value
   551                              <1> 	;
   552                              <1> 	; Set Sequencer Ctl
   553 00001687 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
   554 00001689 83C605              <1> 	add	esi, 5 ; sequ regs
   555                              <1> 	;
   556 0000168C 66BAC403            <1> 	mov	dx, 3C4h  ; VGAREG_SEQU_ADDRESS
   557 00001690 EE                  <1> 	out	dx, al ; 0
   558 00001691 6642                <1> 	inc	dx ; 3C5h ; VGAREG_SEQU_DATA
   559 00001693 B003                <1> 	mov	al, 3
   560 00001695 EE                  <1> 	out	dx, al
   561 00001696 B401                <1> 	mov	ah, 1	
   562                              <1> _sm_8:
   563 00001698 88E0                <1> 	mov	al, ah
   564                              <1> 	;mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
   565 0000169A 664A                <1> 	dec	dx
   566 0000169C EE                  <1> 	out	dx, al ; index
   567 0000169D AC                  <1> 	lodsb
   568 0000169E 6642                <1> 	inc	dx ; 3C5h ; VGAREG_SEQU_DATA
   569 000016A0 EE                  <1> 	out	dx, al
   570 000016A1 80FC04              <1> 	cmp	ah, 4 ; number of sequ regs
   571 000016A4 7304                <1> 	jnb	short _sm_9		
   572 000016A6 FEC4                <1> 	inc	ah 
   573 000016A8 EBEE                <1> 	jmp	short _sm_8
   574                              <1> _sm_9:
   575                              <1> 	; Set Grafx Ctl
   576 000016AA 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
   577 000016AC 83C637              <1> 	add	esi, 55 ; grdc regs
   578 000016AF 30E4                <1> 	xor	ah, ah ; 0
   579                              <1> _sm_10:
   580 000016B1 88E0                <1> 	mov	al, ah
   581 000016B3 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
   582 000016B7 EE                  <1> 	out	dx, al	
   583 000016B8 AC                  <1> 	lodsb
   584 000016B9 6642                <1> 	inc	dx ; 3CFh ; VGAREG_GRDC_DATA
   585 000016BB EE                  <1> 	out	dx, al
   586 000016BC FEC4                <1> 	inc	ah
   587 000016BE 80FC09              <1> 	cmp	ah, 9 ; number of grdc regs
   588 000016C1 72EE                <1> 	jb	short _sm_10
   589                              <1> 	;
   590                              <1> 	; Disable CRTC write protection
   591 000016C3 66BAD403            <1> 	mov	dx, 3D4h  ; VGAREG_VGA_CRTC_ADDRESS
   592                              <1> 	;mov	al, 11h
   593                              <1> 	;our	dx, al
   594                              <1> 	;inc	dx
   595                              <1> 	;sub	al, al
   596                              <1> 	;out	dx, al
   597 000016C7 66B81100            <1> 	mov	ax, 11h
   598 000016CB 66EF                <1> 	out	dx, ax
   599 000016CD 89DE                <1> 	mov	esi, ebx ; addr of params tbl for selected mode
   600 000016CF 83C60A              <1> 	add	esi, 10 ; crtc regs
   601                              <1> 	; ah = 0
   602                              <1> _sm_11:
   603 000016D2 88E0                <1> 	mov	al, ah
   604                              <1> 	; dx = 3D4h = VGAREG_VGA_CRTC_ADDRESS
   605 000016D4 EE                  <1> 	out	dx, al ; index
   606 000016D5 AC                  <1> 	lodsb
   607 000016D6 6642                <1> 	inc	dx  ; VGAREG_VGA_CRTC_ADDRESS + 1
   608 000016D8 EE                  <1> 	out	dx, al ; value
   609 000016D9 80FC18              <1> 	cmp	ah, 24 ; number of crtc registers - 1
   610 000016DC 7306                <1> 	jnb	short _sm_12
   611 000016DE FEC4                <1> 	inc	ah
   612 000016E0 664A                <1> 	dec	dx ; 3D4h
   613 000016E2 EBEE                <1> 	jmp	short _sm_11
   614                              <1> _sm_12:
   615                              <1> 	; Set the misc register
   616 000016E4 66BACC03            <1> 	mov	dx, 3CCh ; VGAREG_READ_MISC_OUTPUT
   617 000016E8 8A4309              <1> 	mov	al, [ebx+9] ; misc reg
   618 000016EB EE                  <1> 	out	dx, al
   619                              <1> 	;
   620                              <1> 	; Enable video
   621 000016EC 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
   622 000016F0 B020                <1> 	mov	al, 20h  
   623 000016F2 EE                  <1>         out     dx, al   ; set bit 5 to 1
   624 000016F3 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
   625 000016F7 EC                  <1> 	in	al, dx
   626                              <1> 	;
   627 000016F8 803D[57650100]00    <1> 	cmp	byte [noclearmem], 0
   628 000016FF 7740                <1>         ja      short _sm_15
   629                              <1> 
   630                              <1> 	; 29/07/2016
   631 00001701 31C0                <1> 	xor	eax, eax
   632 00001703 B900400000          <1> 	mov	ecx, 4000h ; 16K words (32K)
   633 00001708 803D[6E650100]02    <1> 	cmp     byte [VGA_MTYPE], 2  ; CTEXT, MTEXT, CGA
   634 0000170F 7715                <1> 	ja	short _sm_14    ; no ? (0A0000h)
   635 00001711 BF00800B00          <1> 	mov	edi, 0B8000h
   636 00001716 7409                <1> 	je	short _sm_13	; CGA graphics mode
   637                              <1> 	; 08/08/2016
   638 00001718 A3[6A650100]        <1> 	mov	[VGA_INT43H], eax ; 0 ; default font 
   639 0000171D 66B82007            <1> 	mov	ax, 0720h	; CGA text mode
   640                              <1> _sm_13:
   641 00001721 F366AB              <1> 	rep	stosw
   642 00001724 EB1B                <1> 	jmp	short _sm_15		
   643                              <1> 
   644                              <1> _sm_14:
   645 00001726 BF00000A00          <1> 	mov	edi, 0A0000h
   646                              <1> 	; ecx = 16384 dwords  (64K)
   647 0000172B 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
   648 0000172F B002                <1> 	mov	al, 2
   649 00001731 EE                  <1> 	out	dx, al
   650                              <1> 	;mov	dx, 3C5h ; VGAREG_SEQU_DATA
   651 00001732 6642                <1> 	inc	dx
   652 00001734 EC                  <1> 	in	al, dx ; mmask
   653 00001735 6650                <1> 	push	ax
   654 00001737 B00F                <1> 	mov	al, 0Fh ; all planes
   655 00001739 EE                  <1> 	out	dx, al
   656 0000173A 30C0                <1> 	xor	al, al ; 0
   657 0000173C F3AB                <1> 	rep	stosd	; ecx = 163684 (64K)
   658 0000173E 6658                <1> 	pop	ax
   659 00001740 EE                  <1> 	out	dx, al  ; mmask
   660                              <1> _sm_15:
   661                              <1> 	; ebx = addr of params tbl for selected mode
   662                              <1> 	; 10/08/2016
   663 00001741 668B03              <1> 	mov	ax, [ebx] ; num of columns, 'twidth'
   664 00001744 A2[245F0000]        <1> 	mov	[CRT_COLS], al
   665                              <1> 	;; 26/07/2016
   666                              <1> 	;; CRTC_ADDRESS = 3D4h (always)
   667                              <1> 	;mov	ah, [ebx+1] ; num of rows, 'theightm1'
   668 00001749 FEC4                <1> 	inc	ah ; 09/07/2016
   669 0000174B 8825[2A5F0000]      <1> 	mov	[VGA_ROWS], ah
   670                              <1> 	; 10/08/2016
   671 00001751 8A4302              <1> 	mov	al, [ebx+2]
   672 00001754 A2[265F0000]        <1> 	mov	[CHAR_HEIGHT], al 
   673                              <1> 	; 29/07/2016
   674                              <1> 	; length of regen buffer in bytes
   675 00001759 668B4B03            <1> 	mov	cx, [ebx+3] ; 'slength_l'
   676 0000175D 66890D[58650100]    <1> 	mov	[CRT_LEN], cx
   677                              <1> 	;
   678                              <1> 	; 27/07/2016
   679 00001764 30E4                <1> 	xor	ah, ah
   680 00001766 A0[EE580100]        <1> 	mov	al, [ACTIVE_PAGE] ; may be > 0 for mode 3
   681                              <1> 	;mul	word [CRT_LEN] ; 4096 for mode 3
   682 0000176B 66F7E1              <1> 	mul	cx ; 29/07/2016
   683 0000176E 66A3[DC580100]      <1> 	mov	[CRT_START], ax
   684                              <1> 	;
   685 00001774 B060                <1> 	mov	al, 60h
   686 00001776 803D[57650100]00    <1> 	cmp	byte [noclearmem], 0
   687 0000177D 7602                <1> 	jna	short _sm_16
   688 0000177F 0480                <1> 	add	al, 80h
   689                              <1> _sm_16:
   690 00001781 A2[275F0000]        <1> 	mov	[VGA_VIDEO_CTL], al
   691 00001786 C605[285F0000]F9    <1> 	mov	byte [VGA_SWITCHES], 0F9h
   692 0000178D 8025[295F0000]7F    <1> 	and	byte [VGA_MODESET_CTL], 7Fh
   693                              <1> 
   694 00001794 5E                  <1> 	pop	esi ; *
   695                              <1> 
   696                              <1> 	; 26/07/2016
   697                              <1> 	; 07/07/2016
   698 00001795 668B0D[3B5F0000]    <1> 	mov	cx, [CURSOR_MODE] ; restore cursor mode (initial value)
   699 0000179C 66870E              <1> 	xchg	cx, [esi] ; cl = start line, ch = end line
   700                              <1> 			  ; reset to initial value
   701 0000179F 86E9                <1> 	xchg 	ch, cl  ; ch = start line, cl = end line  
   702 000017A1 66890D[3B5F0000]    <1> 	mov	[CURSOR_MODE], cx ; save (fixed) cursor mode
   703                              <1> 
   704                              <1> 	; 27/07/2016
   705 000017A8 803D[6E650100]02    <1> 	cmp	byte [VGA_MTYPE], 2 ; CTEXT, MTEXT
   706 000017AF 7317                <1> 	jnb	short _sm_17
   707                              <1> 
   708                              <1> 	; Set cursor shape
   709                              <1> 	;mov	cx, 0607h
   710                              <1> 	;call	_set_ctype
   711                              <1> 
   712                              <1> 	; 29/07/2016
   713 000017B1 B40A                <1> 	mov	ah, 10	; 6845 register for cursor set
   714 000017B3 E8C4050000          <1> 	call	m16	; output cx register
   715                              <1> 	
   716                              <1> 	; 25/07/2016
   717 000017B8 803D[225F0000]03    <1>         cmp     byte [CRT_MODE], 03h
   718 000017BF 7507                <1> 	jne	short _sm_17
   719                              <1> 	; 26/07/2016
   720                              <1> 
   721 000017C1 A0[EE580100]        <1> 	mov	al, [ACTIVE_PAGE]
   722 000017C6 EB0C                <1> 	jmp	short _sm_18
   723                              <1> _sm_17:
   724                              <1> 	; Set cursor pos for page 0..7
   725 000017C8 6629C0              <1> 	sub	ax, ax ; eax = 0
   726 000017CB BF[DE580100]        <1> 	mov	edi, CURSOR_POSN
   727 000017D0 AB                  <1> 	stosd	
   728 000017D1 AB                  <1> 	stosd
   729 000017D2 AB                  <1> 	stosd
   730 000017D3 AB                  <1> 	stosd
   731                              <1> 	;; Set active page 0
   732                              <1> 	;mov	[ACTIVE_PAGE], al ; 0
   733                              <1> _sm_18:
   734                              <1> 	; 29/07/2016
   735 000017D4 803D[6E650100]02    <1> 	cmp	byte [VGA_MTYPE], 2 ; CTEXT, MTEXT
   736 000017DB 0F8386000000        <1>         jnb	_sm_23
   737                              <1> 
   738                              <1> 	;cmp	byte [CHAR_HEIGHT], 16
   739                              <1> 	;je	short _sm_19
   740                              <1> 
   741                              <1>  	;; copy and activate 8x16 font
   742                              <1> 	
   743                              <1> 	; 26/07/2016
   744 000017E1 B004                <1> 	mov	al, 04h
   745                              <1> 	;sub	bl, bl
   746                              <1> 	; AX = 1104H ; Load ROM 8x16 Character Set
   747                              <1> 	; (BL = font block to load (EGA: 0-3; VGA: 0-7))
   748 000017E3 E83A150000          <1> 	call	load_text_8_16_pat
   749                              <1> 
   750                              <1> 	; video_func_1103h:
   751                              <1> 	; biosfn_set_text_block_specifier:
   752                              <1> 	; BL = font block selector code	
   753                              <1> 	; NOTE: TRDOS 386 only uses and sets font block 0
   754                              <1> 	; (It is as BL = 0 for TRDOS 386)
   755 000017E8 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
   756                              <1> 	;mov	ah, bl
   757 000017EC 28E4                <1> 	sub	ah, ah ; 0
   758 000017EE B003                <1> 	mov	al, 03h
   759 000017F0 66EF                <1> 	out	dx, ax
   760                              <1> _sm_19:
   761                              <1> 	; 29/07/2016
   762                              <1> 	; 26/07/2016
   763                              <1> 	; 24/06/2016
   764                              <1> 	;mov	edi, 0B8000h
   765                              <1> 	;mov	cx, 4000h ; 16K words (32K)
   766                              <1> 	;
   767 000017F2 30C0                <1> 	xor	al, al
   768 000017F4 3805[55650100]      <1>         cmp     byte [p_crt_mode], al ; 0 
   769 000017FA 7707                <1>         ja      short _sm_20 ; 3h, 80h or 83h
   770                              <1> 
   771                              <1> 	; 30/07/2016
   772                              <1> 	; 24/06/2016
   773                              <1> 	; TRDOS 386 (TRDOS v2) 'set mode' modification
   774                              <1> 	; (for multiscreen feature):
   775                              <1> 	; If '_set_mode' procedure is called for video mode 3
   776                              <1> 	;     while video mode is 3, video page will be cleared
   777                              <1> 	;     and cursor position of video page will be reset.	  
   778                              <1> 	; If '_set_mode' procedure is called for a video mode
   779                              <1> 	;     except video mode 3, while current video mode
   780                              <1> 	;     is 3; all video pages of mode 3 will be copied 
   781                              <1> 	;     to 98000h address as backup, before mode change.	 	
   782                              <1> 	; If '_set_mode' procedure is called for video mode 3
   783                              <1> 	;     while video mode is not 3 and if there is video
   784                              <1> 	;     page backup for video mode 3, all (of 8) mode 3
   785                              <1> 	;     video pages will be restored from 98000h.
   786                              <1> 
   787 000017FC A2[EE580100]        <1> 	mov	[ACTIVE_PAGE], al ; 0
   788                              <1> 	;mov	ax, 0720h
   789                              <1> 	;;mov	cx, 4000h ; 16K words (32K)
   790                              <1> 	;;mov	edi, 0B8000h
   791                              <1> 	;rep	stosw
   792                              <1> 	;sub	al, al
   793 00001801 EB64                <1> 	jmp	short _sm_23
   794                              <1> _sm_20:
   795                              <1> 	; Previous video mode is 3
   796                              <1> 	; New video mode is 3 while current video mode is not 3
   797                              <1> 	; (multi screen) video pages will be restored from 0B0000h
   798                              <1> 
   799 00001803 0FB61D[EE580100]    <1> 	movzx	ebx, byte [ACTIVE_PAGE]
   800 0000180A D0E3                <1> 	shl	bl, 1 ; * 2
   801 0000180C 81C3[DE580100]      <1> 	add	ebx, CURSOR_POSN
   802                              <1> 
   803                              <1> 	; 29/07/2016
   804 00001812 F605[55650100]7F    <1> 	test    byte [p_crt_mode], 7Fh ; 83h or 3h
   805 00001819 7427                <1> 	jz	short _sm_21	; do not restore video pages
   806                              <1> 
   807                              <1> 	;; restore video pages
   808 0000181B BE00800900          <1> 	mov	esi, 98000h ; 30/07/2016 
   809 00001820 BF00800B00          <1> 	mov	edi, 0B8000h
   810 00001825 66B90020            <1> 	mov	cx, 2000h ; 8K dwords (32K)
   811 00001829 F3A5                <1> 	rep	movsd
   812                              <1> 
   813                              <1> 	; restore cursor positions
   814 0000182B BE[5A650100]        <1> 	mov	esi, cursor_pposn
   815 00001830 BF[DE580100]        <1> 	mov	edi, CURSOR_POSN
   816                              <1> 	;mov	ecx, 4	; restore all cursor positions (16 bytes)
   817 00001835 B104                <1> 	mov	cl, 4
   818 00001837 F3A5                <1> 	rep 	movsd
   819                              <1> 
   820 00001839 F605[55650100]80    <1>         test    byte [p_crt_mode], 80h
   821 00001840 7420                <1> 	jz	short _sm_22 ; do not clear current video pages
   822                              <1> _sm_21:
   823                              <1> 	; clear video page
   824 00001842 668B0D[58650100]    <1> 	mov	cx, [CRT_LEN] ; 4096 
   825 00001849 66D1E9              <1> 	shr	cx, 1 ; 2072
   826 0000184C 66B82007            <1> 	mov	ax, 0720h
   827 00001850 BF00800B00          <1> 	mov	edi, 0B8000h ; [crt_base]
   828 00001855 66033D[DC580100]    <1> 	add	di, [CRT_START]
   829 0000185C F366AB              <1> 	rep	stosw	; FILL THE REGEN BUFFER WITH BLANKS
   830                              <1> 	;
   831 0000185F 66890B              <1> 	mov	[ebx], cx ; reset cursor position
   832                              <1> _sm_22:
   833 00001862 A2[55650100]        <1> 	mov	[p_crt_mode], al ; 0
   834                              <1> _sm_23:
   835                              <1> 	; al = video page number
   836                              <1> 	; [CRT_LEN] = length of regen buffer in bytes
   837 00001867 E81E010000          <1> 	call	_set_active_page
   838                              <1> 
   839                              <1> ;-----	NORMAL RETURN FROM ALL VIDEO RETURNS
   840 0000186C C3                  <1> 	retn
   841                              <1> 
   842                              <1> cursor_shape_fix:
   843                              <1> 	; 07/07/2016
   844                              <1> 	; (Cursor start and cursor end line values -6,7-
   845                              <1> 	; will be fixed depending on character height)
   846                              <1> 	;
   847                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
   848                              <1> 	; vgabios-0.7a (2011)
   849                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
   850                              <1> 	; 'vgabios.c', ' biosfn_set_cursor_shape (CH,CL)'
   851                              <1> 	;
   852                              <1> 	; INPUT ->
   853                              <1> 	;	AL = cursor start line (=6)
   854                              <1> 	;	AH = cursor end line (=7)
   855                              <1> 	; OUTPUT ->
   856                              <1> 	;	AL = cursor start line (=14)
   857                              <1> 	;	AH = cursor end line (=15)
   858                              <1> 	;
   859                              <1> 	;; if((modeset_ctl&0x01)&&(cheight>8)&&(CL<8)&&(CH<0x20))
   860                              <1> 
   861                              <1> 	;test	byte [VGA_MODESET_CTL], 1 ; VGA active
   862                              <1> 	;jz	short csf_3
   863 0000186D 803D[265F0000]08    <1> 	cmp	byte [CHAR_HEIGHT], 8
   864 00001874 7649                <1> 	jna	short csf_3
   865 00001876 80FC08              <1> 	cmp	ah, 8
   866 00001879 7344                <1> 	jnb	short csf_3
   867 0000187B 3C20                <1> 	cmp	al, 20h
   868 0000187D 7340                <1> 	jnb	short csf_3
   869                              <1> 	;
   870 0000187F 6650                <1> 	push	ax
   871                              <1> 	; {
   872                              <1>    	; if(CL!=(CH+1))	
   873 00001881 FEC0                <1> 	inc	al
   874 00001883 38C4                <1> 	cmp	ah, al   ; ah != al + 1
   875 00001885 740F                <1>         je      short csf_1
   876                              <1> 	; CH = ((CH+1) * cheight / 8) -1;
   877 00001887 8A25[265F0000]      <1> 	mov	ah, [CHAR_HEIGHT]
   878 0000188D F6E4                <1> 	mul	ah
   879 0000188F C0E803              <1> 	shr	al, 3 ; / 8
   880 00001892 FEC8                <1> 	dec	al ; - 1
   881 00001894 EB0E                <1> 	jmp	short csf_2 
   882                              <1> csf_1: 	
   883                              <1>  	; }
   884                              <1>    	; else		; ah = al + 1
   885                              <1>     	; {
   886 00001896 FEC4                <1> 	inc	ah	; ah = ah + 1   
   887                              <1> 	; CH = ((CL+1) * cheight / 8) - 2;
   888 00001898 A0[265F0000]        <1> 	mov	al, [CHAR_HEIGHT]
   889 0000189D F6E4                <1> 	mul	ah
   890 0000189F C0E803              <1> 	shr	al, 3 ; / 8
   891 000018A2 2C02                <1> 	sub	al, 2 ; - 2
   892                              <1> 	; al = 14 (if [CHAR_HEIGHT] = 16)
   893                              <1> csf_2:
   894 000018A4 880424              <1> 	mov	[esp], al
   895 000018A7 8A642401            <1> 	mov	ah, [esp+1]
   896                              <1> 	; CL = ((CL+1) * cheight / 8) - 1;
   897 000018AB FEC4                <1> 	inc	ah 
   898 000018AD A0[265F0000]        <1> 	mov	al, [CHAR_HEIGHT]
   899 000018B2 F6E4                <1> 	mul	ah
   900 000018B4 C0E803              <1> 	shr	al, 3 ; / 8
   901 000018B7 FEC8                <1> 	dec	al ; - 1
   902 000018B9 88442401            <1> 	mov	[esp+1], al
   903                              <1> 	; ah = 15 (if [CHAR_HEIGHT] = 16)
   904                              <1> 	;
   905 000018BD 6658                <1> 	pop	ax
   906                              <1> csf_3:
   907 000018BF C3                  <1> 	retn
   908                              <1> 
   909                              <1> SET_CTYPE:
   910                              <1> 	; 12/09/2016
   911                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   912 000018C0 803D[225F0000]07    <1> 	cmp	byte [CRT_MODE], 7
   913 000018C7 0F8790FCFFFF        <1> 	ja	VIDEO_RETURN ; 12/09/2016
   914 000018CD E805000000          <1> 	call	_set_ctype
   915 000018D2 E986FCFFFF          <1>         jmp     VIDEO_RETURN
   916                              <1> 
   917                              <1> _set_ctype:
   918                              <1> 	; 02/09/2014 (Retro UNIX 386 v1)
   919                              <1> 	;
   920                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
   921                              <1> 
   922                              <1> 	; (CH) = BITS 4-0 = START LINE FOR CURSOR
   923                              <1> 	;  ** HARDWARE WILL ALWAYS CAUSE BLINK
   924                              <1> 	;  ** SETTING BIT 5 OR 6 WILL CAUSE ERRATIC BLINKING
   925                              <1> 	;     OR NO CURSOR AT ALL
   926                              <1> 	; (CL) = BITS 4-0 = END LINE FOR CURSOR
   927                              <1> 
   928                              <1> ;------------------------------------------------
   929                              <1> ; SET_CTYPE
   930                              <1> ;	THIS ROUTINE SETS THE CURSOR VALUE
   931                              <1> ; INPUT
   932                              <1> ;	(CX) HAS CURSOR VALUE CH-START LINE, CL-STOP LINE
   933                              <1> ; OUTPUT	
   934                              <1> ;	NONE
   935                              <1> ;------------------------------------------------
   936                              <1> 
   937                              <1> 	; 07/07/2016
   938                              <1> 	; Fixing cursor start and stop line depending on
   939                              <1> 	; current character height (=16)
   940                              <1> 	; (Note: Default/initial values are 6 and 7.
   941                              <1> 	; If set values are 6 (start) & 7 (stop) and 
   942                              <1> 	; [CHAR_HEIGHT] = 16 :
   943                              <1> 	; After fixing, start line will be 14, stop line
   944                              <1> 	; will be 15.)
   945 000018D7 6689C8              <1> 	mov	ax, cx
   946 000018DA 86C4                <1> 	xchg	al, ah
   947                              <1> 	; AL = start line, AH = stop line
   948 000018DC E88CFFFFFF          <1> 	call	cursor_shape_fix
   949                              <1> 	; AL = start line (fixed), AH = stop line (fixed)
   950 000018E1 6689C1              <1> 	mov	cx, ax
   951 000018E4 86E9                <1> 	xchg	ch, cl
   952                              <1> 	; CH = start line (fixed), CL = stop line (fixed)
   953                              <1> 	;
   954 000018E6 B40A                <1> 	mov	ah, 10	; 6845 register for cursor set
   955 000018E8 66890D[3B5F0000]    <1> 	mov	[CURSOR_MODE], cx ; save in data area
   956                              <1> 	;call	m16	; output cx register
   957                              <1> 	;retn
   958 000018EF E988040000          <1>         jmp     m16
   959                              <1> 
   960                              <1> SET_CPOS:
   961                              <1> 	; 12/09/2016
   962                              <1> 	; 07/07/2016
   963                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   964 000018F4 80FF07              <1> 	cmp	bh, 7 ; video page > 7 ; 07/07/2016
   965 000018F7 0F8760FCFFFF        <1> 	ja	VIDEO_RETURN
   966                              <1> 	;
   967 000018FD 803D[225F0000]07    <1> 	cmp	byte [CRT_MODE], 7
   968 00001904 770A                <1> 	ja	short vga_set_cpos ; 12/09/2016	
   969 00001906 E846040000          <1> 	call	_set_cpos
   970 0000190B E94DFCFFFF          <1>         jmp     VIDEO_RETURN
   971                              <1> 
   972                              <1> vga_set_cpos:
   973                              <1> 	; 12/09/2016
   974                              <1> 	; 09/07/2016
   975                              <1> 	; set cursor position
   976                              <1> 	; NOTE: Hardware cursor position will not be set
   977                              <1> 	;   in any VGA modes (>7)
   978                              <1> 	;   But, cursor position will be saved into
   979                              <1> 	;   [CURSOR_POSN].
   980                              <1> 	;   TRDOS 386 (TRDOS v2.0) uses only one page
   981                              <1> 	;   (page 0) for all graphics modes.
   982                              <1> 
   983 00001910 668915[DE580100]    <1> 	mov	[CURSOR_POSN], dx ; save cursor pos for pg 0
   984                              <1> 	; 04/08/2016
   985                              <1> 	;mov	bh, [ACTIVE_PAGE] ; = 0
   986                              <1> 	;call	_set_cpos
   987 00001917 E941FCFFFF          <1> 	jmp     VIDEO_RETURN
   988                              <1> 
   989                              <1> READ_CURSOR:
   990                              <1> 	; 12/09/2016
   991                              <1> 	; 07/07/2016
   992                              <1> 	; 12/05/2016
   993                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   994                              <1> 	;
   995                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
   996                              <1> 
   997                              <1> ;------------------------------------------------------
   998                              <1> ; READ_CURSOR
   999                              <1> ;	THIS ROUTINE READS THE CURRENT CURSOR VALUE FROM THE
  1000                              <1> ;	845, FORMATS IT, AND SENDS IT BACK TO THE CALLER
  1001                              <1> ; INPUT
  1002                              <1> ;	BH - PAGE OF CURSOR
  1003                              <1> ; OUTPUT
  1004                              <1> ;	DX - ROW, COLUMN OF THE CURRENT CURSOR POSITION
  1005                              <1> ;	CX - CURRENT CURSOR MODE
  1006                              <1> ;------------------------------------------------------
  1007                              <1> 
  1008                              <1> 	; BH = Video page number (0 to 7)
  1009                              <1> 
  1010                              <1> 	; 07/07/2016
  1011 0000191C 80FF07              <1> 	cmp	bh, 7 ; video page > 7 (invalid)
  1012 0000191F 7606                <1> 	jna	short read_cursor_1
  1013                              <1> 	; invalid video page (input) 
  1014 00001921 31C9                <1> 	xor	ecx, ecx ; 0
  1015 00001923 31D2                <1> 	xor	edx, edx ; 0
  1016 00001925 EB15                <1> 	jmp	short read_cursor_2
  1017                              <1> read_cursor_1:
  1018                              <1> 	; 12/09/2016
  1019 00001927 803D[225F0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; vga mode
  1020 0000192E 7727                <1> 	ja	short vga_get_cpos
  1021                              <1> 	;
  1022 00001930 E815000000          <1> 	call	get_cpos
  1023 00001935 0FB70D[3B5F0000]    <1> 	movzx	ecx, word [CURSOR_MODE]
  1024                              <1> read_cursor_2:
  1025 0000193C 5D                  <1> 	pop	ebp
  1026 0000193D 5F                  <1> 	pop	edi
  1027 0000193E 5E                  <1> 	pop	esi
  1028 0000193F 5B                  <1> 	pop	ebx
  1029 00001940 58                  <1> 	pop	eax  ; DISCARD SAVED CX AND DX
  1030 00001941 58                  <1> 	pop	eax
  1031 00001942 A1[48650100]        <1> 	mov	eax, [video_eax] ; 12/05/2016
  1032                              <1> 	;;15/01/2017
  1033                              <1> 	;;mov	byte [intflg], 0 ; 07/01/2017
  1034 00001947 1F                  <1> 	pop	ds
  1035 00001948 07                  <1> 	pop	es
  1036 00001949 CF                  <1> 	iretd
  1037                              <1> 
  1038                              <1> get_cpos:
  1039                              <1> 	; 12/05/2016
  1040                              <1> 	; 16/01/2016
  1041                              <1> 	; BH = Video page number (0 to 7)
  1042                              <1> 	;
  1043 0000194A D0E7                <1> 	shl	bh, 1 ; WORD OFFSET
  1044 0000194C 0FB6F7              <1> 	movzx	esi, bh 
  1045 0000194F 0FB796[DE580100]    <1> 	movzx	edx, word [esi+CURSOR_POSN]
  1046 00001956 C3                  <1> 	retn
  1047                              <1> 
  1048                              <1> vga_get_cpos:
  1049                              <1> 	; 12/09/2016
  1050                              <1> 	; get cursor position (vga)
  1051 00001957 0FB715[DE580100]    <1> 	movzx	edx, word [CURSOR_POSN] ; cursor pos for pg 0
  1052 0000195E 31C9                <1> 	xor	ecx, ecx ; Cursor Mode = 0 (invalid)
  1053 00001960 EBDA                <1> 	jmp     short read_cursor_2
  1054                              <1> 
  1055                              <1> ACT_DISP_PAGE:
  1056                              <1> 	; 07/07/2016
  1057                              <1> 	; 26/06/2016
  1058                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1059                              <1> 	;
  1060                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1061                              <1> 	;
  1062                              <1> ;-----------------------------------------------------
  1063                              <1> ; ACT_DISP_PAGE
  1064                              <1> ;	THIS ROUTINE SETS THE ACTIVE DISPLAY PAGE, ALLOWING
  1065                              <1> ;	THE FULL USE OF THE MEMORY SET ASIDE FOR THE VIDEO ATTACHMENT
  1066                              <1> ; INPUT
  1067                              <1> ;	AL HAS THE NEW ACTIVE DISPLAY PAGE
  1068                              <1> ; OUTPUT
  1069                              <1> ;	THE 6845 IS RESET TO DISPLAY THAT PAGE
  1070                              <1> ;-----------------------------------------------------
  1071                              <1> 	; 07/07/2016
  1072 00001962 3C07                <1> 	cmp	al, 7	; > 7 = invalid video page number
  1073 00001964 0F87F3FBFFFF        <1> 	ja	VIDEO_RETURN
  1074 0000196A 803D[225F0000]03    <1>         cmp     byte [CRT_MODE], 3
  1075 00001971 7408                <1> 	je	short adp_1
  1076 00001973 20C0                <1> 	and 	al, al
  1077 00001975 0F85E2FBFFFF        <1>         jnz     VIDEO_RETURN
  1078                              <1> 	;sub	al, al ; 0 ; force to page 0
  1079                              <1> adp_1:	
  1080 0000197B E805000000          <1> 	call	set_active_page
  1081 00001980 E9D8FBFFFF          <1>         jmp     VIDEO_RETURN
  1082                              <1> 
  1083                              <1> set_active_page:   ; tty_sw
  1084                              <1> 	; 09/12/2017
  1085                              <1> 	; 26/07/2016
  1086                              <1> 	; 26/06/2016
  1087                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1088                              <1> 	; 30/06/2015
  1089                              <1> 	; 04/03/2014  (act_disp_page --> tty_sw)
  1090                              <1> 	; 10/12/2013
  1091                              <1> 	; 04/12/2013
  1092                              <1> 	;
  1093 00001985 A2[EE580100]        <1> 	mov	[ACTIVE_PAGE], al ; save active page value ; [ptty]
  1094                              <1> _set_active_page:
  1095                              <1> 	; 27/06/2015
  1096 0000198A 0FB6D8              <1> 	movzx	ebx, al
  1097                              <1> 	;
  1098                              <1> 	;cbw	; 07/09/2014 (ah=0)
  1099 0000198D 28E4                <1> 	sub	ah, ah ; 09/12/2017
  1100 0000198F 66F725[58650100]    <1> 	mul	word [CRT_LEN]  ; get saved length of regen buffer
  1101                              <1> 				; display page times regen length
  1102                              <1> 	; 10/12/2013
  1103 00001996 66A3[DC580100]      <1> 	mov	[CRT_START], ax ; save start address for later
  1104 0000199C 6689C1              <1> 	mov	cx, ax ; start address to cx
  1105                              <1> _M16:
  1106                              <1> 	;sar	cx, 1
  1107 0000199F 66D1E9              <1> 	shr	cx, 1	; divide by 2 for 6845 handling
  1108 000019A2 B40C                <1> 	mov	ah, 12	; 6845 register for start address
  1109 000019A4 E8D3030000          <1> 	call	m16
  1110                              <1> 	;sal	bx, 1
  1111                              <1> 	; 01/09/2014
  1112 000019A9 D0E3                <1> 	shl	bl, 1	; *2 for word offset
  1113 000019AB 81C3[DE580100]      <1> 	add	ebx, CURSOR_POSN
  1114 000019B1 668B13              <1> 	mov	dx, [ebx] ; get cursor for this page
  1115                              <1> 	; 16/01/2016
  1116                              <1> 	;call	m18
  1117                              <1> 	;retn
  1118 000019B4 E9AF030000          <1> 	jmp	m18
  1119                              <1> 
  1120                              <1> position:
  1121                              <1> 	; 24/06/2016
  1122                              <1> 	; 12/05/2016 - TRDOS 386 (TRDOS v2.0)
  1123                              <1> 	; 27/06/2015
  1124                              <1> 	; 02/09/2014
  1125                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  1126                              <1> 	; 04/12/2013 (Retro UNIX 8086 v1)
  1127                              <1> 	;
  1128                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1129                              <1> 	;
  1130                              <1> ;-----------------------------------------
  1131                              <1> ; POSITION
  1132                              <1> ;	THIS SERVICE ROUTINE CALCULATES THE REGEN BUFFER ADDRESS
  1133                              <1> ;	OF A CHARACTER IN THE ALPHA MODE
  1134                              <1> ; INPUT
  1135                              <1> ;	AX = ROW, COLUMN POSITION
  1136                              <1> ; OUTPUT
  1137                              <1> ;	AX = OFFSET OF CHAR POSITION IN REGEN BUFFER
  1138                              <1> ;-----------------------------------------
  1139                              <1> 
  1140                              <1> 	; DX = ROW, COLUMN POSITION
  1141 000019B9 0FB605[245F0000]    <1> 	movzx	eax, byte [CRT_COLS] ; 24/06/2016
  1142 000019C0 F6E6                <1> 	mul	dh	 ; row value
  1143 000019C2 30F6                <1> 	xor	dh, dh   ; 0	
  1144 000019C4 6601D0              <1> 	add	ax, dx	 ; add column value to the result
  1145 000019C7 66D1E0              <1> 	shl	ax, 1	; * 2 for attribute bytes
  1146                              <1> 		; EAX = AX = OFFSET OF CHAR POSITION IN REGEN BUFFER 
  1147 000019CA C3                  <1> 	retn
  1148                              <1> 
  1149                              <1> find_position:
  1150                              <1> 	; 24/06/2016
  1151                              <1> 	; 12/05/2016 - TRDOS 386 (TRDOS v2.0)
  1152                              <1> 	; 27/06/2015
  1153                              <1> 	; 07/09/2014
  1154                              <1> 	; 02/09/2014
  1155                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  1156                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1157                              <1> 
  1158 000019CB 0FB6CF              <1> 	movzx	ecx, bh ; video page number
  1159 000019CE 89CE                <1> 	mov	esi, ecx
  1160 000019D0 66D1E6              <1> 	shl	si, 1
  1161 000019D3 668B96[DE580100]    <1> 	mov	dx, [esi+CURSOR_POSN]
  1162 000019DA 740C                <1> 	jz	short p21
  1163 000019DC 6631F6              <1> 	xor	si, si
  1164                              <1> p20:
  1165 000019DF 660335[58650100]    <1> 	add	si, [CRT_LEN] ; 24/06/2016
  1166                              <1> 	;add	si, 80*25*2 ; add length of buffer for one page		
  1167 000019E6 E2F7                <1> 	loop	p20
  1168                              <1> p21:
  1169 000019E8 6621D2              <1> 	and	dx, dx
  1170 000019EB 7407                <1> 	jz	short p22
  1171 000019ED E8C7FFFFFF          <1> 	call 	position ; determine location in regen in page
  1172 000019F2 01C6                <1> 	add	esi, eax ; add location to start of regen page
  1173                              <1> p22:	
  1174                              <1> 	;mov	dx, [addr_6845] ; get base address of active display			
  1175                              <1> 	;mov	dx, 03D4h ; I/O address of color card
  1176                              <1> 	;add	dx, 6	; point at status port
  1177 000019F4 66BADA03            <1> 	mov	dx, 03DAh ; status port
  1178                              <1> 	; cx = 0
  1179 000019F8 C3                  <1> 	retn
  1180                              <1> 
  1181                              <1> SCROLL_UP:
  1182                              <1> 	; 07/07/2016
  1183                              <1> 	; 26/06/2016
  1184                              <1> 	; 12/05/2016
  1185                              <1> 	; 30/01/2016
  1186                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1187                              <1> 	; 07/09/2014
  1188                              <1> 	; 02/09/2014
  1189                              <1> 	; 01/09/2014 (Retro UNIX 386 v1 - beginning)
  1190                              <1> 	; 04/04/2014
  1191                              <1> 	; 04/12/2013
  1192                              <1> 	;
  1193                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1194                              <1> 	;
  1195                              <1> ;----------------------------------------------
  1196                              <1> ; SCROLL UP
  1197                              <1> ;	THIS ROUTINE MOVES A BLOCK OF CHARACTERS UP
  1198                              <1> ;	ON THE SCREEN
  1199                              <1> ; INPUT
  1200                              <1> ;	(AH) = CURRENT CRT MODE
  1201                              <1> ;	(AL) = NUMBER OF ROWS TO SCROLL
  1202                              <1> ;	(CX) = ROW/COLUMN OF UPPER LEFT CORNER
  1203                              <1> ;	(DX) = ROW/COLUMN OF LOWER RIGHT CORNER
  1204                              <1> ;	(BH) = ATTRIBUTE TO BE USED ON BLANKED LINE
  1205                              <1> ;	(DS) = DATA SEGMENT
  1206                              <1> ;	(ES) = REGEN BUFFER SEGMENT
  1207                              <1> ; OUTPUT
  1208                              <1> ;	NONE -- THE REGEN BUFFER IS MODIFIED
  1209                              <1> ;--------------------------------------------
  1210                              <1> 
  1211                              <1> 	; 07/07/2016
  1212 000019F9 38F5                <1> 	cmp	ch, dh
  1213 000019FB 0F875CFBFFFF        <1> 	ja	VIDEO_RETURN
  1214 00001A01 38D1                <1> 	cmp	cl, dl
  1215 00001A03 0F8754FBFFFF        <1> 	ja	VIDEO_RETURN
  1216                              <1> 	;
  1217 00001A09 E805000000          <1> 	call	_scroll_up
  1218 00001A0E E94AFBFFFF          <1>         jmp     VIDEO_RETURN
  1219                              <1> 
  1220                              <1> _scroll_up:  ; from 'write_tty'
  1221                              <1> 	;
  1222                              <1> 	; cl = left upper column
  1223                              <1> 	; ch = left upper row
  1224                              <1> 	; dl = right lower column
  1225                              <1> 	; dh = right lower row
  1226                              <1> 	;
  1227                              <1> 	; al = line count 
  1228                              <1> 	; bl = attribute to be used on blanked line	
  1229                              <1> 	; bh = video page number (0 to 7)
  1230                              <1> 
  1231 00001A13 E896000000          <1> 	call	test_line_count ; 16/01/2016
  1232                              <1> 
  1233 00001A18 8A25[225F0000]      <1> 	mov	ah, [CRT_MODE] ; current video mode	
  1234                              <1> 	;cmp	ah, 4
  1235                              <1>  	;jb	short n0
  1236                              <1> 	;cmp	byte [CRT_MODE], 4
  1237 00001A1E 80FC04              <1>         cmp	ah, 4 ; 07/07/2016
  1238 00001A21 0F8320050000        <1> 	jnb     GRAPHICS_UP ; 26/06/2016
  1239                              <1> 
  1240                              <1> 	;cmp	ah, 7 ; TEST FOR BW CARD
  1241                              <1> 	;jne	GRAPHICS_UP
  1242                              <1> n0:
  1243                              <1> 	; 07/07/2016
  1244 00001A27 80FF07              <1> 	cmp	bh, 7 ; video page number
  1245 00001A2A 7606                <1> 	jna	short n1
  1246 00001A2C 8A3D[EE580100]      <1> 	mov	bh, [ACTIVE_PAGE]
  1247                              <1> n1:
  1248 00001A32 88DC                <1> 	mov	ah, bl ; attribute
  1249 00001A34 6650                <1> 	push	ax ; *
  1250                              <1> 	;mov 	esi, [CRT_BASE]
  1251 00001A36 BE00800B00          <1>         mov     esi, 0B8000h  
  1252 00001A3B 3A3D[EE580100]      <1>         cmp     bh, [ACTIVE_PAGE]
  1253 00001A41 750B                <1> 	jne	short n2
  1254                              <1> 	;
  1255 00001A43 66A1[DC580100]      <1>         mov     ax, [CRT_START]
  1256 00001A49 6601C6              <1>         add     si, ax
  1257 00001A4C EB11                <1>         jmp     short n4
  1258                              <1> n2:
  1259 00001A4E 20FF                <1>         and     bh, bh
  1260 00001A50 740D                <1> 	jz	short n4
  1261 00001A52 88F8                <1> 	mov	al, bh
  1262                              <1> n3:
  1263 00001A54 660335[58650100]    <1>         add	si, [CRT_LEN]
  1264 00001A5B FEC8                <1>         dec	al
  1265 00001A5D 75F5                <1> 	jnz	short n3
  1266                              <1> n4:	
  1267 00001A5F E85D000000          <1> 	call	scroll_position ; 16/01/2016
  1268 00001A64 7420                <1>         jz      short n6 
  1269                              <1> 
  1270 00001A66 01CE                <1>         add     esi, ecx ; from address for scroll
  1271 00001A68 88F5                <1> 	mov	ch, dh  ; #rows in block
  1272 00001A6A 28C5                <1> 	sub	ch, al	; #rows to be moved
  1273                              <1> n5:
  1274 00001A6C E894000000          <1> 	call	n10 ; 16/01/2016
  1275                              <1> 	
  1276 00001A71 51                  <1>         push	ecx
  1277 00001A72 0FB60D[245F0000]    <1> 	movzx	ecx, byte [CRT_COLS] 
  1278 00001A79 00C9                <1> 	add	cl, cl
  1279 00001A7B 01CE                <1>         add	esi, ecx  ; next line
  1280 00001A7D 01CF                <1>         add	edi, ecx
  1281 00001A7F 59                  <1> 	pop	ecx
  1282                              <1> 
  1283 00001A80 FECD                <1> 	dec	ch	 ; count of lines to move
  1284 00001A82 75E8                <1> 	jnz	short n5 ; row loop
  1285                              <1> 	; ch = 0
  1286 00001A84 88C6                <1> 	mov	dh, al	 ; #rows	
  1287                              <1> n6:
  1288                              <1> 	; attribute in ah
  1289 00001A86 B020                <1> 	mov	al, ' '	 ; fill with blanks
  1290                              <1> n7:
  1291 00001A88 E885000000          <1> 	call	n11 ; 16/01/2016
  1292                              <1> 
  1293 00001A8D 8A0D[245F0000]      <1> 	mov	cl, [CRT_COLS]
  1294 00001A93 00C9                <1> 	add	cl, cl
  1295 00001A95 01CF                <1>         add	edi, ecx
  1296                              <1> 
  1297 00001A97 FECE                <1> 	dec	dh
  1298 00001A99 75ED                <1> 	jnz	short n7
  1299                              <1> n16:
  1300 00001A9B 3A3D[EE580100]      <1> 	cmp	bh, [ACTIVE_PAGE]
  1301 00001AA1 750A                <1> 	jne	short n8
  1302                              <1> 	
  1303                              <1> 	;cmp	byte [CRT_MODE], 7	; is this the black and white card
  1304                              <1> 	;je	short n8		; if so, skip the mode reset
  1305                              <1> 
  1306 00001AA3 A0[235F0000]        <1> 	mov	al, [CRT_MODE_SET] ; get the value of mode set
  1307 00001AA8 66BAD803            <1> 	mov	dx, 03D8h ; always set color card port
  1308 00001AAC EE                  <1> 	out	dx, al
  1309                              <1> n8:
  1310 00001AAD C3                  <1> 	retn
  1311                              <1> 
  1312                              <1> test_line_count:
  1313                              <1> 	; 12/05/2016
  1314                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1315                              <1> 	; 07/09/2014 (scroll_up)
  1316 00001AAE 08C0                <1> 	or	al, al
  1317 00001AB0 740E                <1> 	jz	short al_set2
  1318 00001AB2 6652                <1> 	push	dx
  1319 00001AB4 28EE                <1> 	sub	dh, ch  ; subtract upper row from lower row number
  1320 00001AB6 FEC6                <1> 	inc	dh	; adjust difference by 1
  1321 00001AB8 38C6                <1> 	cmp	dh, al 	; line count = amount of rows in window?
  1322 00001ABA 7502                <1> 	jne	short al_set1 ; if not the we're all set
  1323 00001ABC 30C0                <1> 	xor	al, al	; otherwise set al to zero
  1324                              <1> al_set1:
  1325 00001ABE 665A                <1> 	pop	dx
  1326                              <1> al_set2:
  1327 00001AC0 C3                  <1> 	retn
  1328                              <1> 
  1329                              <1> scroll_position:
  1330                              <1> 	; 26/06/2016
  1331                              <1> 	; 30/01/2016
  1332                              <1>         ; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1333                              <1> 	; 07/09/2014 (scroll_up)
  1334                              <1> 
  1335 00001AC1 6652                <1> 	push	dx
  1336 00001AC3 6689CA              <1> 	mov	dx, cx	; now, upper left position in DX
  1337 00001AC6 E8EEFEFFFF          <1> 	call	position
  1338 00001ACB 01C6                <1> 	add	esi, eax
  1339 00001ACD 89F7                <1> 	mov	edi, esi
  1340 00001ACF 665A                <1> 	pop	dx	; lower right position in DX
  1341 00001AD1 6629CA              <1> 	sub	dx, cx
  1342 00001AD4 FEC6                <1> 	inc	dh	; dh = #rows 
  1343 00001AD6 FEC2                <1> 	inc	dl	; dl = #cols in block
  1344 00001AD8 59                  <1> 	pop	ecx 	; return address
  1345 00001AD9 6658                <1> 	pop	ax	; * ; al = line count, ah = attribute
  1346 00001ADB 51                  <1> 	push	ecx	; return address
  1347 00001ADC 0FB7C8              <1> 	movzx	ecx, ax
  1348 00001ADF 8A25[245F0000]      <1> 	mov	ah, [CRT_COLS]
  1349 00001AE5 F6E4                <1> 	mul	ah	; determine offset to from address
  1350 00001AE7 6601C0              <1> 	add	ax, ax  ; *2 for attribute byte
  1351                              <1> 	;
  1352 00001AEA 6650                <1> 	push	ax	; offset 
  1353 00001AEC 6652                <1> 	push	dx
  1354                              <1> 	;
  1355                              <1> 	; 04/04/2014
  1356 00001AEE 66BADA03            <1> 	mov	dx, 3DAh ; guaranteed to be color card here	
  1357                              <1> n9:                      ; wait_display_enable
  1358 00001AF2 EC                  <1>         in      al, dx   ; get port
  1359 00001AF3 A808                <1> 	test	al, RVRT ; wait for vertical retrace	
  1360 00001AF5 74FB                <1> 	jz	short n9 ; wait_display_enable
  1361 00001AF7 B025                <1> 	mov	al, 25h
  1362 00001AF9 B2D8                <1> 	mov	dl, 0D8h ; address control port
  1363 00001AFB EE                  <1> 	out	dx, al	; turn off video during vertical retrace
  1364 00001AFC 665A                <1> 	pop	dx	; #rows, #cols
  1365 00001AFE 6658                <1>        	pop	ax	; offset
  1366 00001B00 6691                <1> 	xchg	ax, cx	; 
  1367                              <1> 	; ecx = offset, al = line count, ah = attribute
  1368                              <1> 	;
  1369 00001B02 08C0                <1> 	or	al, al
  1370 00001B04 C3                  <1> 	retn
  1371                              <1> n10:
  1372                              <1> 	; Move rows
  1373 00001B05 88D1                <1> 	mov	cl, dl	; get # of cols to move
  1374 00001B07 56                  <1> 	push	esi
  1375 00001B08 57                  <1> 	push	edi	; save start address
  1376                              <1> n10r:
  1377 00001B09 66A5                <1> 	movsw		; move that line on screen
  1378 00001B0B FEC9                <1> 	dec	cl
  1379 00001B0D 75FA                <1>         jnz     short n10r
  1380 00001B0F 5F                  <1> 	pop	edi
  1381 00001B10 5E                  <1> 	pop	esi	; recover addresses
  1382 00001B11 C3                  <1> 	retn
  1383                              <1> n11:
  1384                              <1> 	; Clear rows
  1385                              <1>                 	; dh =  #rows
  1386 00001B12 88D1                <1>         mov	cl, dl	; get # of cols to clear
  1387 00001B14 57                  <1>         push    edi     ; save address
  1388                              <1> n11r:
  1389 00001B15 66AB                <1>         stosw           ; store fill character
  1390 00001B17 FEC9                <1> 	dec	cl
  1391 00001B19 75FA                <1>         jnz     short n11r
  1392 00001B1B 5F                  <1>         pop     edi     ; recover address
  1393 00001B1C C3                  <1> 	retn
  1394                              <1> 
  1395                              <1> SCROLL_DOWN:
  1396                              <1> 	; 07/07/2016
  1397                              <1> 	; 27/06/2016
  1398                              <1> 	; 26/06/2016
  1399                              <1> 	; 12/05/2016
  1400                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1401                              <1> 	;
  1402                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1403                              <1> 
  1404                              <1> ;------------------------------------------
  1405                              <1> ; SCROLL DOWN
  1406                              <1> ;	THIS ROUTINE MOVES THE CHARACTERS WITHIN A DEFINED
  1407                              <1> ;	BLOCK DOWN ON THE SCREEN, FILLING THE TOP LINES
  1408                              <1> ;	WITH A DEFINED CHARACTER
  1409                              <1> ; INPUT
  1410                              <1> ;	(AH) = CURRENT CRT MODE
  1411                              <1> ;	(AL) = NUMBER OF LINES TO SCROLL
  1412                              <1> ;	(CX) = UPPER LEFT CORNER OF RECION
  1413                              <1> ;	(DX) = LOWER RIGHT CORNER OF REGION
  1414                              <1> ;	(BH) = FILL CHARACTER
  1415                              <1> ;	(DS) = DATA SEGMENT
  1416                              <1> ;	(ES) = REGEN SEGMENT
  1417                              <1> ; OUTPUT
  1418                              <1> ;	NONE -- SCREEN IS SCROLLED
  1419                              <1> ;------------------------------------------
  1420                              <1> 
  1421                              <1> 	; 07/07/2016
  1422 00001B1D 38F5                <1> 	cmp	ch, dh
  1423 00001B1F 0F8738FAFFFF        <1> 	ja	VIDEO_RETURN
  1424 00001B25 38D1                <1> 	cmp	cl, dl
  1425 00001B27 0F8730FAFFFF        <1> 	ja	VIDEO_RETURN
  1426                              <1> 	;
  1427 00001B2D E805000000          <1> 	call	_scroll_down
  1428 00001B32 E926FAFFFF          <1>         jmp     VIDEO_RETURN
  1429                              <1> 
  1430                              <1> _scroll_down: ; 27/06/2016
  1431                              <1> 
  1432                              <1> 	; cl = left upper column
  1433                              <1> 	; ch = left upper row
  1434                              <1> 	; dl = right lower column
  1435                              <1> 	; dh = right lower row
  1436                              <1> 	;
  1437                              <1> 	; al = line count 
  1438                              <1> 	; bl = attribute to be used on blanked line	
  1439                              <1> 	; bh = video page number (0 to 7)
  1440                              <1> 
  1441                              <1> 	; !!!!
  1442 00001B37 FD                  <1> 	std		; DIRECTION FOR SCROLL DOWN
  1443                              <1> 	; !!!!
  1444 00001B38 E871FFFFFF          <1> 	call	test_line_count ; 16/01/2016
  1445                              <1> 	
  1446 00001B3D 8A25[225F0000]      <1> 	mov	ah, [CRT_MODE] ; current video mode	
  1447                              <1> 	;cmp	ah, 4
  1448                              <1>  	;jb	short _n0
  1449                              <1> 	;cmp	byte [CRT_MODE], 4
  1450 00001B43 80FC04              <1>         cmp	ah, 4 ; 07/07/2016
  1451 00001B46 0F83DF070000        <1> 	jnb     GRAPHICS_DOWN ; 26/06/2016
  1452                              <1> 
  1453                              <1> 	;cmp	ah, 7 ; TEST FOR BW CARD
  1454                              <1> 	;jne	GRAPHICS_DOWN
  1455                              <1> _n0:
  1456                              <1> 	; 07/07/2016
  1457 00001B4C 80FF07              <1> 	cmp	bh, 7 ; video page number
  1458 00001B4F 7606                <1> 	jna	short n12
  1459 00001B51 8A3D[EE580100]      <1> 	mov	bh, [ACTIVE_PAGE]
  1460                              <1> 	;
  1461                              <1> n12:			; CONTINUE_DOWN
  1462 00001B57 88DC                <1> 	mov	ah, bl
  1463 00001B59 6650                <1> 	push	ax	; * ; save attribute in ah
  1464 00001B5B 6689D0              <1> 	mov	ax, dx	; LOWER RIGHT CORNER
  1465 00001B5E E85EFFFFFF          <1> 	call	scroll_position	; GET REGEN LOCATION
  1466 00001B63 741F                <1> 	jz	short n14
  1467 00001B65 29CE                <1> 	sub	esi, ecx  ; SI IS FROM ADDRESS
  1468 00001B67 88F5                <1> 	mov	ch, dh  ; #rows in block
  1469 00001B69 28C5                <1> 	sub	ch, al	; #rows to be moved
  1470                              <1> n13:
  1471 00001B6B E895FFFFFF          <1> 	call	n10	; MOVE ONE ROW
  1472                              <1> 
  1473 00001B70 51                  <1> 	push	ecx
  1474 00001B71 8A0D[245F0000]      <1> 	mov	cl, [CRT_COLS] 
  1475 00001B77 00C9                <1> 	add	cl, cl
  1476 00001B79 29CE                <1>         sub	esi, ecx  ; next line
  1477 00001B7B 29CF                <1>         sub	edi, ecx
  1478 00001B7D 59                  <1>         pop	ecx
  1479                              <1> 	
  1480 00001B7E FECD                <1> 	dec	ch	 ; count of lines to move
  1481 00001B80 75E9                <1> 	jnz	short n13 ; row loop
  1482                              <1> 	; ch = 0
  1483 00001B82 88C6                <1> 	mov	dh, al	 ; #rows
  1484                              <1> n14:
  1485                              <1> 	; attribute in ah
  1486 00001B84 B020                <1> 	mov	al, ' '	 ; fill with blanks
  1487                              <1> n15:
  1488 00001B86 E887FFFFFF          <1> 	call	n11 ; 16/01/2016
  1489                              <1> 
  1490 00001B8B 8A0D[245F0000]      <1> 	mov	cl, [CRT_COLS]
  1491 00001B91 00C9                <1> 	add	cl, cl
  1492 00001B93 29CF                <1>         sub	edi, ecx
  1493                              <1>         
  1494 00001B95 FECE                <1> 	dec	dh
  1495 00001B97 75ED                <1> 	jnz	short n15
  1496                              <1> 	;
  1497 00001B99 E9FDFEFFFF          <1> 	jmp	n16 ; 27/06/2016
  1498                              <1> 
  1499                              <1> ;	cmp	bh, [ACTIVE_PAGE]
  1500                              <1> ;	jne	short n16
  1501                              <1> ;
  1502                              <1> ;	;cmp	byte [CRT_MODE], 7	; is this the black and white card
  1503                              <1> ;	;je	short n16		; if so, skip the mode reset
  1504                              <1> ;
  1505                              <1> ;	mov	al, [CRT_MODE_SET] ; get the value of mode set
  1506                              <1> ;	mov	dx, 03D8h ; always set color card port
  1507                              <1> ;	out	dx, al
  1508                              <1> ;n16:
  1509                              <1> ;	; !!!!
  1510                              <1> ;	cld		; Clear direction flag !
  1511                              <1> ;	; !!!!
  1512                              <1> ;	retn
  1513                              <1> 
  1514                              <1> READ_AC_CURRENT:
  1515                              <1> 	; 08/07/2016
  1516                              <1> 	; 26/06/2016
  1517                              <1> 	; 12/05/2016
  1518                              <1> 	; 18/01/2016
  1519                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1520                              <1> 	;
  1521                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1522                              <1> 	;
  1523                              <1> 	; 08/07/2016
  1524 00001B9E 803D[225F0000]07    <1>         cmp     byte [CRT_MODE], 7 ; 6!?
  1525 00001BA5 7607                <1> 	jna	short read_ac_c
  1526 00001BA7 31C0                <1> 	xor	eax, eax
  1527 00001BA9 E9B4F9FFFF          <1>         jmp     _video_return 
  1528                              <1> read_ac_c:
  1529 00001BAE E805000000          <1> 	call	_read_ac_current
  1530                              <1> 	; 12/05/2016
  1531                              <1>         ;jmp     VIDEO_RETURN
  1532 00001BB3 E9AAF9FFFF          <1> 	jmp	_video_return
  1533                              <1> 
  1534                              <1> ;------------------------------------------------------------------------
  1535                              <1> ; READ_AC_CURRENT							:
  1536                              <1> ;	THIS ROUTINE READS THE ATTRIBUTE AND CHARACTER AT THE CURRENT	:
  1537                              <1> ;	CURSOR POSITION AND RETURNS THEM TO THE CALLER			:
  1538                              <1> ; INPUT									:
  1539                              <1> ;	(AH) = CURRENT CRT MODE						:
  1540                              <1> ;	(BH) = DISPLAY PAGE ( ALPHA MODES ONLY )			:
  1541                              <1> ;	(DS) = DATA SEGMENT						:
  1542                              <1> ;	(ES) = REGEN SEGMENT						:
  1543                              <1> ; OUTPUT								:
  1544                              <1> ;	(AL) = CHARACTER READ						:
  1545                              <1> ;	(AH) = ATTRIBUTE READ						:
  1546                              <1> ;------------------------------------------------------------------------
  1547                              <1> 
  1548                              <1> _read_ac_current:
  1549                              <1> 	; 26/06/2016
  1550                              <1> 	; 12/05/2016 
  1551                              <1> 	; 18/01/2016
  1552                              <1> 
  1553                              <1> 	;mov	ah, [CRT_MODE] ; current video mode	
  1554                              <1> 	;cmp	ah, 4
  1555                              <1>  	;jb	short p10
  1556 00001BB8 803D[225F0000]04    <1> 	cmp	byte [CRT_MODE], 4
  1557 00001BBF 0F83BB080000        <1> 	jnb     GRAPHICS_READ ; 26/06/2016
  1558                              <1> 
  1559                              <1> 	;cmp	ah, 7 ; TEST FOR BW CARD
  1560                              <1> 	;jne	GRAPHICS_READ
  1561                              <1> p10:
  1562 00001BC5 E801FEFFFF          <1> 	call	find_position	; GET REGEN LOCATION AND PORT ADDRESS
  1563                              <1> 	;
  1564                              <1> 	; esi = regen location
  1565                              <1> 	; dx = status port
  1566                              <1> 	;
  1567 00001BCA 8A25[225F0000]      <1> 	mov	ah, [CRT_MODE]	
  1568 00001BD0 80EC02              <1> 	sub	ah, 2
  1569 00001BD3 D0EC                <1> 	shr	ah, 1
  1570 00001BD5 7515                <1> 	jnz	short p13
  1571                              <1> 
  1572                              <1> 	; WAIT FOR HORIZONTAL RETRACE OR VERTICAL RETRACE IF COLOR 80
  1573                              <1> p11:
  1574 00001BD7 FB                  <1> 	sti		; enable interrupts first
  1575 00001BD8 3A3D[EE580100]      <1> 	cmp     bh, [ACTIVE_PAGE]
  1576 00001BDE 750C                <1> 	jne	short p13 
  1577 00001BE0 FA                  <1> 	cli 		; block interrupts for single loop
  1578 00001BE1 EC                  <1> 	in	al, dx	; get status from the adapter
  1579 00001BE2 A801                <1> 	test	al, RHRZ ; is horizontal retrace low
  1580 00001BE4 75F1                <1> 	jnz	short p11 ; wait until it is
  1581                              <1> p12:			;  wait for either retrace high
  1582 00001BE6 EC                  <1> 	in	al, dx ; get status again
  1583 00001BE7 A809                <1> 	test	al, RVRT+RHRZ ; is horizontal or vertical retrace high
  1584 00001BE9 74FB                <1> 	jz	short p12 ; wait until either retrace active
  1585 00001BEB FB                  <1> 	sti
  1586                              <1> p13:
  1587 00001BEC 81C600800B00        <1> 	add	esi, 0B8000h 
  1588 00001BF2 668B06              <1> 	mov	ax, [esi]
  1589                              <1> 
  1590 00001BF5 C3                  <1> 	retn	; 18/01/2016
  1591                              <1> 
  1592                              <1> WRITE_AC_CURRENT:
  1593                              <1> 	; 08/07/2016
  1594                              <1> 	; 26/06/2016
  1595                              <1> 	; 24/06/2016
  1596                              <1> 	; 12/05/2016
  1597                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1598                              <1> 	;
  1599                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1600                              <1> 	;
  1601                              <1> ;----------------------------------------------------------------
  1602                              <1> ; WRITE_AC_CURRENT						:
  1603                              <1> ;	THTS ROUTINE WRITES THE ATTRIBUTE AND CHARACTER		:
  1604                              <1> ;	AT THE CURRENT CURSOR POSITION				:
  1605                              <1> ; INPUT								:
  1606                              <1> ;	(AH) = CURRENT CRT MODE					:
  1607                              <1> ;	(BH) = DISPLAY PAGE					:
  1608                              <1> ;	(CX) = COUNT OF CHARACTERS TO WRITE			:
  1609                              <1> ;	(AL) = CHAR TO WRITE					:
  1610                              <1> ;	(BL) = ATTRIBUTE OF CHAR TO WRITE			:
  1611                              <1> ;	(DS) = DATA SEGMENT					:
  1612                              <1> ;	(ES) = REGEN SEGMENT					:
  1613                              <1> ; OUTPUT							:
  1614                              <1> ;	DISPLAY REGEN BUFFER UPDATED				:
  1615                              <1> ;----------------------------------------------------------------
  1616                              <1> 
  1617                              <1> 	; 08/07/2016
  1618 00001BF6 803D[225F0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; 6!?
  1619 00001BFD 760A                <1> 	jna	short write_ac_c
  1620                              <1> 
  1621 00001BFF E8F20A0000          <1> 	call	vga_write_char_attr
  1622 00001C04 E954F9FFFF          <1> 	jmp     VIDEO_RETURN	
  1623                              <1> 
  1624                              <1> write_ac_c:
  1625 00001C09 E834000000          <1> 	call	_write_c_current
  1626                              <1> 
  1627 00001C0E 0FB6F7              <1> 	movzx	esi, bh ; video page number (0 to 7)	
  1628 00001C11 889E[2B5F0000]      <1> 	mov	[esi+chr_attrib], bl ; color/attribute
  1629                              <1> 
  1630 00001C17 E941F9FFFF          <1>         jmp     VIDEO_RETURN
  1631                              <1> 
  1632                              <1> WRITE_C_CURRENT:
  1633                              <1> 	; 08/07/2016
  1634                              <1> 	; 26/06/2016
  1635                              <1> 	; 12/05/2016
  1636                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1637                              <1> 	;
  1638                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1639                              <1> 	;
  1640                              <1> ;----------------------------------------------------------------
  1641                              <1> ; WRITE_C_CURRENT						:
  1642                              <1> ;	THIS ROUTINE WRITES THE CHARACTER AT			:
  1643                              <1> ;	THE CURRENT CURSOR POSITION, ATTRIBUTE UNCHANGED	:
  1644                              <1> ; INPUT								:
  1645                              <1> ;	(AH) = CURRENT CRT MODE					:
  1646                              <1> ;	(BH) = DISPLAY PAGE					:
  1647                              <1> ;	(CX) = COUNT OF CHARACTERS TO WRITE			:
  1648                              <1> ;	(AL) = CHAR TO WRITE					:
  1649                              <1> ;	(DS) = DATA SEGMENT					:
  1650                              <1> ;	(ES) = REGEN SEGMENT					:
  1651                              <1> ; OUTPUT							:
  1652                              <1> ;	DISPLAY REGEN BUFFER UPDATED				:
  1653                              <1> ;----------------------------------------------------------------
  1654                              <1> 
  1655                              <1> 	; 08/07/2016
  1656 00001C1C 803D[225F0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; 6!?
  1657 00001C23 760A                <1> 	jna	short write_c_c
  1658                              <1> 
  1659 00001C25 E8CC0A0000          <1> 	call	vga_write_char_only
  1660 00001C2A E92EF9FFFF          <1> 	jmp     VIDEO_RETURN	
  1661                              <1> 
  1662                              <1> write_c_c:
  1663                              <1> 	;and	bh, 7 ; video page number (<= 7)
  1664 00001C2F 0FB6F7              <1> 	movzx	esi, bh	
  1665 00001C32 8A9E[2B5F0000]      <1> 	mov	bl, [esi+chr_attrib]
  1666                              <1> 
  1667 00001C38 E805000000          <1> 	call	_write_c_current
  1668 00001C3D E91BF9FFFF          <1>         jmp     VIDEO_RETURN
  1669                              <1> 
  1670                              <1> _write_c_current:  ; from 'write_tty'
  1671                              <1> 	; 26/06/2016
  1672                              <1> 	; 24/06/2016
  1673                              <1> 	; 12/05/2016
  1674                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1675                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  1676                              <1> 	; 18/01/2014
  1677                              <1> 	; 04/12/2013
  1678                              <1> 	;
  1679                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1680                              <1> 
  1681                              <1> 	;mov	ah, [CRT_MODE] ; current video mode	
  1682                              <1> 	;cmp	ah, 4
  1683                              <1>  	;jb	short p40
  1684 00001C42 803D[225F0000]04    <1> 	cmp	byte [CRT_MODE], 4
  1685 00001C49 0F8381070000        <1>         jnb     GRAPHICS_WRITE ; 26/06/2016
  1686                              <1> 
  1687                              <1> 	;cmp	ah, 7 ; TEST FOR BW CARD
  1688                              <1> 	;jne	GRAPHICS_WRITE
  1689                              <1> p40:
  1690                              <1> 	; al = character
  1691                              <1> 	; bl = color/attribute
  1692                              <1> 	; bh = video page
  1693                              <1> 	; cx = count of characters to write
  1694 00001C4F 6652                <1> 	push	dx
  1695 00001C51 88DC                <1> 	mov	ah, bl  ; color/attribute (12/05/2016)
  1696 00001C53 6650                <1> 	push	ax	; save character & attribute/color
  1697 00001C55 6651                <1> 	push	cx
  1698 00001C57 E86FFDFFFF          <1> 	call 	find_position  ; get regen location and port address
  1699 00001C5C 6659                <1> 	pop	cx
  1700                              <1> 	; esi = regen location
  1701                              <1> 	; dx = status port
  1702                              <1> 	;
  1703 00001C5E 81C600800B00        <1> 	add	esi, 0B8000h ; 30/08/2014 (crt_base) 
  1704                              <1> 	;
  1705 00001C64 8A25[225F0000]      <1> 	mov	ah, [CRT_MODE]	
  1706 00001C6A 80EC02              <1> 	sub	ah, 2
  1707 00001C6D D0EC                <1> 	shr	ah, 1
  1708 00001C6F 7519                <1> 	jnz	short p44    ; 26/06/2016
  1709                              <1> 
  1710                              <1> 	; WAIT FOR HORIZONTAL RETRACE OR VERTICAL RETRACE IF COLOR 80
  1711                              <1> p41:
  1712 00001C71 FB                  <1> 	sti		; enable interrupts first
  1713 00001C72 3A3D[EE580100]      <1> 	cmp     bh, [ACTIVE_PAGE]
  1714 00001C78 7510                <1> 	jne	short p44 
  1715 00001C7A FA                  <1> 	cli 		; block interrupts for single loop
  1716 00001C7B EC                  <1> 	in	al, dx	; get status from the adapter
  1717 00001C7C A808                <1> 	test	al, RVRT ; check for vertical retrace first
  1718 00001C7E 7509                <1> 	jnz	short p43 ; Do fast write now if vertical retrace
  1719 00001C80 A801                <1> 	test	al, RHRZ ; is horizontal retrace low
  1720 00001C82 75ED                <1> 	jnz	short p41 ; wait until it is
  1721                              <1> p42:			;  wait for either retrace high
  1722 00001C84 EC                  <1> 	in	al, dx ; get status again
  1723 00001C85 A809                <1> 	test	al, RVRT+RHRZ ; is horizontal or vertical retrace high
  1724 00001C87 74FB                <1> 	jz	short p42 ; wait until either retrace active
  1725                              <1> p43:	
  1726 00001C89 FB                  <1> 	sti
  1727                              <1> p44:
  1728 00001C8A 668B0424            <1> 	mov	ax, [esp] ; restore the character (al) & attribute (ah)
  1729 00001C8E 668906              <1> 	mov	[esi], ax
  1730                              <1> 
  1731 00001C91 6649                <1> 	dec	cx
  1732 00001C93 7404                <1> 	jz	short p45
  1733                              <1> 
  1734 00001C95 46                  <1> 	inc	esi
  1735 00001C96 46                  <1> 	inc	esi
  1736 00001C97 EBD8                <1> 	jmp	short p41
  1737                              <1> p45:	
  1738 00001C99 6658                <1> 	pop	ax
  1739 00001C9B 665A                <1> 	pop	dx
  1740 00001C9D C3                  <1> 	retn
  1741                              <1> 
  1742                              <1> ; 09/07/2016
  1743                              <1> ; 26/06/2016
  1744                              <1> ; 24/06/2016
  1745                              <1> ; 12/05/2016
  1746                              <1> ; 18/01/2016
  1747                              <1> ; 16/01/2016 - TRDOS 386 (TRDOS v2.0)
  1748                              <1> ; 30/06/2015
  1749                              <1> ; 27/06/2015
  1750                              <1> ; 11/03/2015
  1751                              <1> ; 02/09/2014
  1752                              <1> ; 30/08/2014
  1753                              <1> ; VIDEO FUNCTIONS
  1754                              <1> ; (write_tty - Retro UNIX 8086 v1 - U9.ASM, 01/02/2014)
  1755                              <1> 
  1756                              <1> WRITE_TTY:
  1757                              <1> 	; 09/12/2017
  1758                              <1> 	; 09/07/2016
  1759                              <1> 	; 01/07/2016
  1760                              <1> 	; 26/06/2016
  1761                              <1> 	; 24/06/2016
  1762                              <1> 	; 13/05/2016
  1763                              <1> 	; 12/05/2016
  1764                              <1> 	; 30/01/2016
  1765                              <1> 	; 18/01/2016
  1766                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
  1767                              <1> 	; 13/08/2015
  1768                              <1> 	; 02/09/2014
  1769                              <1> 	; 30/08/2014 (Retro UNIX 386 v1 - beginning)
  1770                              <1> 	; 01/02/2014 (Retro UNIX 8086 v1 - last update)
  1771                              <1> 	; 03/12/2013 (Retro UNIX 8086 v1 - beginning)	
  1772                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX, ESI, EDI)
  1773                              <1> 	;
  1774                              <1> 	; INPUT -> AL = Character to be written
  1775                              <1> 	;	   BL = Color (Forecolor, Backcolor)
  1776                              <1> 	;	   BH = Video Page (0 to 7)
  1777                              <1> 
  1778                              <1> 	; 09/07/2016
  1779 00001C9E 803D[225F0000]07    <1>         cmp     byte [CRT_MODE], 7
  1780 00001CA5 760A                <1> 	jna 	short write_tty_cga
  1781                              <1> 
  1782 00001CA7 E8290D0000          <1> 	call	vga_write_teletype
  1783 00001CAC E9ACF8FFFF          <1> 	jmp	VIDEO_RETURN
  1784                              <1> 
  1785                              <1> write_tty_cga:
  1786                              <1> 	; 13/05/2016
  1787                              <1> 	;call	_write_tty
  1788                              <1> 	; 01/07/2016
  1789 00001CB1 E818000000          <1> 	call	_write_tty_m3
  1790 00001CB6 E9A2F8FFFF          <1> 	jmp	VIDEO_RETURN
  1791                              <1> 
  1792                              <1> RVRT	equ	00001000b	; VIDEO VERTICAL RETRACE BIT
  1793                              <1> RHRZ	equ	00000001b	; VIDEO HORIZONTAL RETRACE BIT
  1794                              <1> 
  1795                              <1> ; Derived from "WRITE_TTY" procedure of IBM "pc-at" rombios source code
  1796                              <1> ; (06/10/1985), 'video.asm', INT 10H, VIDEO_IO
  1797                              <1> ;
  1798                              <1> ; 06/10/85  VIDEO DISPLAY BIOS
  1799                              <1> ;
  1800                              <1> ;--- WRITE_TTY ------------------------------------------------------------------
  1801                              <1> ;										:
  1802                              <1> ;   THIS INTERFACE PROVIDES A TELETYPE LIKE INTERFACE TO THE			:
  1803                              <1> ;   VIDEO CARDS. THE INPUT CHARACTER IS WRITTEN TO THE CURRENT			:
  1804                              <1> ;   CURSOR POSITION, AND THE CURSOR IS MOVED TO THE NEXT POSITION.		:
  1805                              <1> ;   IF THE CURSOR LEAVES THE LAST COLUMN OF THE FIELD, THE COLUMN		:
  1806                              <1> ;   IS SET TO ZERO, AND THE ROW VALUE IS INCREMENTED. IF THE ROW		:
  1807                              <1> ;   ROW VALUE LEAVES THE FIELD, THE CURSOR IS PLACED ON THE LAST ROW,		:
  1808                              <1> ;   FIRST COLUMN, AND THE ENTIRE SCREEN IS SCROLLED UP ONE LINE.		:
  1809                              <1> ;   WHEN THE SCREEN IS SCROLLED UP, THE ATTRIBUTE FOR FILLING THE		:
  1810                              <1> ;   NEWLY BLANKED LINE IS READ FROM THE CURSOR POSITION ON THE PREVIOUS		:
  1811                              <1> ;   LINE BEFORE THE SCROLL, IN CHARACTER MODE. IN GRAPHICS MODE,		:
  1812                              <1> ;   THE 0 COLOR IS USED.							:
  1813                              <1> ;   ENTRY --									:
  1814                              <1> ;     (AH) = CURRENT CRT MODE							:
  1815                              <1> ;     (AL) = CHARACTER TO BE WRITTEN						:
  1816                              <1> ;	    NOTE THAT BACK SPACE, CARRIAGE RETURN, BELL AND LINE FEED ARE	:
  1817                              <1> ;	    HANDLED AS COMMANDS RATHER THAN AS DISPLAY GRAPHICS CHARACTERS	:
  1818                              <1> ;     (BL) = FOREGROUND COLOR FOR CHAR WRITE IF CURRENTLY IN A GRAPHICS MODE	:
  1819                              <1> ;   EXIT -- 									:
  1820                              <1> ;     ALL REGISTERS SAVED							:
  1821                              <1> ;--------------------------------------------------------------------------------
  1822                              <1> 
  1823                              <1> ; 09/12/2017
  1824                              <1> ; 08/07/2016
  1825                              <1> ; 26/06/2016
  1826                              <1> ; 24/06/2016
  1827                              <1> _write_tty:	; 13/05/2016
  1828 00001CBB FA                  <1> 	cli
  1829                              <1> 	;
  1830                              <1> 	; 01/09/2014
  1831 00001CBC 803D[225F0000]03    <1> 	cmp	byte [CRT_MODE], 3
  1832 00001CC3 7409                <1> 	je	short _write_tty_m3
  1833                              <1> 	;
  1834                              <1> set_mode_3:
  1835 00001CC5 53                  <1> 	push	ebx
  1836 00001CC6 50                  <1> 	push	eax
  1837 00001CC7 E8A2F8FFFF          <1> 	call	_set_mode
  1838 00001CCC 58                  <1> 	pop	eax
  1839 00001CCD 5B                  <1> 	pop	ebx
  1840                              <1> 	;
  1841                              <1> _write_tty_m3: ; 24/06/2016 (m3 -> _write_tty_m3)
  1842 00001CCE 0FB6F7              <1> 	movzx 	esi, bh ; 12/05/2016
  1843 00001CD1 66D1E6              <1> 	shl	si, 1
  1844 00001CD4 81C6[DE580100]      <1> 	add	esi, CURSOR_POSN
  1845 00001CDA 668B16              <1> 	mov	dx, [esi]
  1846                              <1> 	;
  1847                              <1> 	; dx now has the current cursor position
  1848                              <1> 	;
  1849 00001CDD 3C0D                <1> 	cmp	al, 0Dh	; CR	; is it carriage return or control character
  1850 00001CDF 7636                <1> 	jbe	short u8
  1851                              <1> 	;
  1852                              <1> 	; write the char to the screen
  1853                              <1> u0:	
  1854                              <1> 	; al = character
  1855                              <1> 	; bl = attribute/color
  1856                              <1> 	; bh = video page number (0 to 7)
  1857                              <1> 	;
  1858 00001CE1 66B90100            <1> 	mov	cx, 1  ; 24/06/2016
  1859                              <1> 	; cx = count of characters to write
  1860                              <1> 	;
  1861 00001CE5 E858FFFFFF          <1> 	call	_write_c_current ; 16/01/2015
  1862                              <1> 	;
  1863                              <1> 	; position the cursor for next char
  1864 00001CEA FEC2                <1> 	inc	dl		; next column
  1865 00001CEC 3A15[245F0000]      <1> 	cmp	dl, [CRT_COLS]  ; test for column overflow 
  1866 00001CF2 755D                <1>         jne     _set_cpos
  1867 00001CF4 B200                <1> 	mov	dl, 0		; column = 0
  1868                              <1> u10:				; (line feed found)
  1869 00001CF6 80FE18              <1> 	cmp	dh, 25-1 	; check for last row
  1870 00001CF9 7218                <1> 	jb 	short u6
  1871                              <1> 	;
  1872                              <1> 	; scroll required
  1873                              <1> u1:	
  1874                              <1> 	; SET CURSOR POSITION (04/12/2013)
  1875 00001CFB E851000000          <1> 	call	_set_cpos
  1876                              <1> 	;
  1877                              <1> 	; determine value to fill with during scroll
  1878                              <1> u2:
  1879                              <1> 	; bh = video page number
  1880                              <1> 	;
  1881 00001D00 E8B3FEFFFF          <1> 	call	_read_ac_current ; 18/01/2016
  1882                              <1> 	;
  1883                              <1> 	; al = character, ah = attribute
  1884                              <1> 	; bh = video page number 	
  1885                              <1> u3:
  1886                              <1> 	;;mov	ax, 0601h 	; scroll one line
  1887                              <1> 	;;sub	cx, cx		; upper left corner
  1888                              <1> 	;;mov	dh, 25-1 	; lower right row
  1889                              <1> 	;;;mov	dl, [CRT_COLS]
  1890                              <1> 	;mov	dl, 80		; lower right column	
  1891                              <1> 	;;dec	dl
  1892                              <1> 	;;mov	dl, 79
  1893                              <1> 
  1894                              <1> 	;;call	scroll_up	; 04/12/2013
  1895                              <1> 	;;; 11/03/2015
  1896                              <1> 	; 02/09/2014
  1897                              <1> 	;;;mov	cx, [crt_ulc] ; Upper left corner  (0000h)
  1898                              <1> 	;;;mov	dx, [crt_lrc] ; Lower right corner (184Fh)
  1899                              <1> 	; 11/03/2015
  1900 00001D05 6629C9              <1> 	sub	cx, cx
  1901 00001D08 66BA4F18            <1> 	mov	dx, 184Fh ; dl = 79 (column), dh = 24 (row)
  1902                              <1> 	;
  1903 00001D0C B001                <1> 	mov	al, 1		; scroll 1 line up
  1904                              <1> 		; ah = attribute
  1905                              <1> 	;mov	bl, al ; 12/05/2016
  1906 00001D0E E900FDFFFF          <1> 	jmp	_scroll_up	; 16/01/2016
  1907                              <1> ;u4:
  1908                              <1> 	;;int	10h		; video-call return
  1909                              <1> 				; scroll up the screen
  1910                              <1> 				; tty return
  1911                              <1> ;u5:
  1912                              <1> 	;retn			; return to the caller
  1913                              <1> 
  1914                              <1> u6:				; set-cursor-inc
  1915 00001D13 FEC6                <1> 	inc	dh		; next row
  1916                              <1> 				; set cursor
  1917                              <1> ;u7:					
  1918                              <1> 	;;mov	ah, 02h
  1919                              <1> 	;;jmp	short u4 	; establish the new cursor
  1920                              <1> 	;call	_set_cpos
  1921                              <1> 	;jmp 	short u5
  1922 00001D15 EB3A                <1> 	jmp     _set_cpos
  1923                              <1> 
  1924                              <1> 	; check for control characters
  1925                              <1> u8:
  1926 00001D17 7436                <1> 	je	short u9
  1927 00001D19 3C0A                <1> 	cmp	al, 0Ah		; is it a line feed (0Ah)
  1928 00001D1B 74D9                <1> 	je	short u10
  1929 00001D1D 3C07                <1> 	cmp	al, 07h 	; is it a bell
  1930 00001D1F 747A                <1> 	je	short u11
  1931 00001D21 3C08                <1> 	cmp	al, 08h		; is it a backspace
  1932                              <1> 	;jne	short u0
  1933 00001D23 7422                <1> 	je	short bs	; 12/12/2013
  1934                              <1> 	; 12/12/2013 (tab stop)
  1935 00001D25 3C09                <1> 	cmp	al, 09h		; is it a tab stop
  1936 00001D27 75B8                <1> 	jne	short u0
  1937 00001D29 88D0                <1> 	mov	al, dl
  1938                              <1> 	;cbw
  1939 00001D2B 30E4                <1> 	xor	ah, ah ; 09/12/2017
  1940 00001D2D B108                <1> 	mov	cl, 8
  1941 00001D2F F6F1                <1> 	div	cl
  1942 00001D31 28E1                <1> 	sub	cl, ah
  1943                              <1> ts:
  1944                              <1> 	; 02/09/2014
  1945                              <1> 	; 01/09/2014
  1946 00001D33 B020                <1> 	mov	al, 20h
  1947                              <1> tsloop:
  1948 00001D35 6651                <1> 	push	cx
  1949 00001D37 6650                <1> 	push	ax
  1950                              <1> 	;mov	bh, [ACTIVE_PAGE]
  1951 00001D39 E890FFFFFF          <1> 	call	_write_tty_m3 ; 24/06/2016 (m3 -> _write_tty_m3)
  1952 00001D3E 6658                <1> 	pop	ax  ; ah = attribute/color
  1953 00001D40 6659                <1> 	pop	cx
  1954 00001D42 FEC9                <1> 	dec	cl
  1955 00001D44 75EF                <1> 	jnz	short tsloop
  1956 00001D46 C3                  <1> 	retn
  1957                              <1> bs:	
  1958                              <1> 	; back space found
  1959                              <1> 
  1960 00001D47 08D2                <1> 	or	dl, dl 		; is it already at start of line
  1961                              <1> 	;je	short u7 	; set_cursor
  1962 00001D49 7406                <1> 	jz	short _set_cpos
  1963 00001D4B 664A                <1> 	dec	dx     		; no -- just move it back
  1964                              <1> 	;jmp	short u7
  1965 00001D4D EB02                <1> 	jmp	short _set_cpos
  1966                              <1> 
  1967                              <1> 	; carriage return found
  1968                              <1> u9:
  1969 00001D4F B200                <1> 	mov	dl, 0 		; move to first column
  1970                              <1> 	;jmp	short u7
  1971                              <1> 	;jmp	short _set_cpos ; 30/01/2016
  1972                              <1> 
  1973                              <1> 	; line feed found
  1974                              <1> ;u10:
  1975                              <1> ;	cmp	dh, 25-1 	; bottom of screen
  1976                              <1> ;	jne	short u6 	; no, just set the cursor
  1977                              <1> ;       jmp     u1              ; yes, scroll the screen
  1978                              <1> 
  1979                              <1> _set_cpos:
  1980                              <1> 	; 12/05/2016 - TRDOS 386 (TRDOS v2.0)
  1981                              <1> 	; 27/06/2015
  1982                              <1> 	; 01/09/2014
  1983                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  1984                              <1> 	;
  1985                              <1> 	; 04/12/2013 - 12/12/2013 (Retro UNIX 8086 v1) 
  1986                              <1> 	;
  1987                              <1> 	; VIDEO.ASM - 06/10/85  VIDEO DISPLAY BIOS
  1988                              <1> 	;
  1989                              <1> ;----------------------------------------------
  1990                              <1> ; SET_CPOS
  1991                              <1> ;	THIS ROUTINE SETS THE CURRENT CURSOR POSITION TO THE
  1992                              <1> ;	NEW X-Y VALUES PASSED
  1993                              <1> ; INPUT
  1994                              <1> ;	DX - ROW,COLUMN OF NEW CURSOR
  1995                              <1> ;	BH - DISPLAY PAGE OF CURSOR
  1996                              <1> ; OUTPUT
  1997                              <1> ;	CURSOR ID SET AT 6845 IF DISPLAY PAGE IS CURRENT DISPLAY
  1998                              <1> ;----------------------------------------------
  1999                              <1> 	;
  2000 00001D51 BE[DE580100]        <1> 	mov	esi, CURSOR_POSN
  2001 00001D56 0FB6C7              <1>         movzx   eax, bh	; BH = video page number
  2002                              <1> ;	or	al, al
  2003                              <1> ;	jz	short _set_cpos_0
  2004 00001D59 D0E0                <1>         shl     al, 1   ; word offset
  2005 00001D5B 01C6                <1>         add     esi, eax
  2006                              <1> ;_set_cpos_0:
  2007 00001D5D 668916              <1> 	mov	[esi], dx ; save the pointer
  2008 00001D60 383D[EE580100]      <1> 	cmp	[ACTIVE_PAGE], bh
  2009 00001D66 7532                <1> 	jne	short m17
  2010                              <1> 	;call	m18	; CURSOR SET
  2011                              <1> ;m17:			; SET_CPOS_RETURN
  2012                              <1> 	; 01/09/2014
  2013                              <1> ;	retn
  2014                              <1> 		; DX  = row/column
  2015                              <1> m18:
  2016 00001D68 E84CFCFFFF          <1> 	call	position ; determine location in regen buffer	
  2017 00001D6D 668B0D[DC580100]    <1> 	mov	cx, [CRT_START]
  2018 00001D74 6601C1              <1> 	add	cx, ax  ; add char position in regen buffer
  2019                              <1> 			; to the start address (offset) for this page
  2020 00001D77 66D1E9              <1> 	shr	cx, 1	; divide by 2 for char only count
  2021 00001D7A B40E                <1> 	mov	ah, 14	; register number for cursor
  2022                              <1> 	;call	m16	; output value to the 6845	
  2023                              <1> 	;retn
  2024                              <1> 
  2025                              <1> 	;-----	THIS ROUTINE OUTPUTS THE CX REGISTER
  2026                              <1> 	;	TO THE 6845 REGISTERS NAMED IN (AH)
  2027                              <1> m16:
  2028 00001D7C FA                  <1> 	cli
  2029                              <1> 	;mov	dx, [addr_6845] ; address register
  2030 00001D7D 66BAD403            <1> 	mov 	dx, 03D4h ; I/O address of color card
  2031 00001D81 88E0                <1> 	mov	al, ah	; get value
  2032 00001D83 EE                  <1> 	out	dx, al	; register set
  2033 00001D84 6642                <1> 	inc	dx	; data register
  2034 00001D86 EB00                <1> 	jmp	$+2	; i/o delay
  2035 00001D88 88E8                <1> 	mov	al, ch	; data
  2036 00001D8A EE                  <1> 	out	dx, al	
  2037 00001D8B 664A                <1> 	dec	dx	
  2038 00001D8D 88E0                <1> 	mov	al, ah
  2039 00001D8F FEC0                <1> 	inc	al	; point to other data register
  2040 00001D91 EE                  <1> 	out	dx, al	; set for second register
  2041 00001D92 6642                <1> 	inc	dx
  2042 00001D94 EB00                <1> 	jmp	$+2	; i/o delay
  2043 00001D96 88C8                <1> 	mov	al, cl	; second data value
  2044 00001D98 EE                  <1> 	out	dx, al
  2045 00001D99 FB                  <1> 	sti
  2046                              <1> m17:
  2047 00001D9A C3                  <1> 	retn
  2048                              <1> 
  2049                              <1> beeper: 
  2050                              <1> 	; 04/08/2016
  2051                              <1> 	; 12/05/2016 - TRDOS 386 (TRDOS v2.0)
  2052                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  2053                              <1> 	; 18/01/2014
  2054                              <1> 	; 03/12/2013
  2055                              <1> 	; bell found
  2056                              <1> u11:
  2057 00001D9B FB                  <1> 	sti
  2058 00001D9C 3A3D[EE580100]      <1> 	cmp	bh, [ACTIVE_PAGE]
  2059 00001DA2 7551                <1> 	jne	short u12	; Do not sound the beep 
  2060                              <1> 				; if it is not written on the active page
  2061                              <1> beeper_gfx: ; 04/08/2016
  2062 00001DA4 66B93305            <1> 	mov	cx, 1331 	; divisor for 896 hz tone
  2063 00001DA8 B31F                <1> 	mov	bl, 31		; set count for 31/64 second for beep
  2064                              <1> 	;call	beep		; sound the pod bell
  2065                              <1> 	;jmp	short u5 	; tty_return
  2066                              <1> 	;retn
  2067                              <1> 	
  2068                              <1> TIMER	equ 	040h   		; 8254 TIMER - BASE ADDRESS
  2069                              <1> PORT_B	equ	061h		; PORT B READ/WRITE DIAGNOSTIC REGISTER
  2070                              <1> GATE2	equ	00000001b	; TIMER 2 INPUT CATE CLOCK BIT
  2071                              <1> SPK2	equ	00000010b	; SPEAKER OUTPUT DATA ENABLE BIT
  2072                              <1> 
  2073                              <1> beep:
  2074                              <1> 	; 07/02/2015
  2075                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  2076                              <1> 	; 18/01/2014
  2077                              <1> 	; 03/12/2013
  2078                              <1> 	;
  2079                              <1> 	; TEST4.ASM - 06/10/85  POST AND BIOS UTILITY ROUTINES
  2080                              <1> 	;
  2081                              <1> 	; ROUTINE TO SOUND THE BEEPER USING TIMER 2 FOR TONE
  2082                              <1> 	;
  2083                              <1> 	; ENTRY:
  2084                              <1> 	;    (BL) = DURATION COUNTER ( 1 FOR 1/64 SECOND )
  2085                              <1> 	;    (CX) = FREQUENCY DIVISOR (1193180/FREQUENCY) (1331 FOR 886 HZ)
  2086                              <1> 	; EXIT:				:
  2087                              <1> 	;    (AX),(BL),(CX) MODIFIED.
  2088                              <1> 
  2089 00001DAA 9C                  <1> 	pushf  ; 18/01/2014	; save interrupt status
  2090 00001DAB FA                  <1> 	cli			; block interrupts during update
  2091 00001DAC B0B6                <1> 	mov	al, 10110110b	; select timer 2, lsb, msb binary
  2092 00001DAE E643                <1> 	out	TIMER+3, al 	; write timer mode register
  2093 00001DB0 EB00                <1> 	jmp	$+2		; I/O delay
  2094 00001DB2 88C8                <1> 	mov	al, cl		; divisor for hz (low)
  2095 00001DB4 E642                <1> 	out	TIMER+2,AL	; write timer 2 count - lsb
  2096 00001DB6 EB00                <1> 	jmp	$+2		; I/O delay
  2097 00001DB8 88E8                <1> 	mov	al, ch		; divisor for hz (high)
  2098 00001DBA E642                <1> 	out	TIMER+2, al	; write timer 2 count - msb
  2099 00001DBC E461                <1> 	in	al, PORT_B	; get current setting of port
  2100 00001DBE 88C4                <1> 	mov	ah, al		; save that setting
  2101 00001DC0 0C03                <1> 	or	al, GATE2+SPK2	; gate timer 2 and turn speaker on
  2102 00001DC2 E661                <1> 	out	PORT_B, al	; and restore interrupt status
  2103                              <1> 	;popf	; 18/01/2014
  2104 00001DC4 FB                  <1> 	sti
  2105                              <1> g7:				; 1/64 second per count (bl)
  2106 00001DC5 B90B040000          <1> 	mov	ecx, 1035	; delay count for 1/64 of a second	
  2107 00001DCA E827000000          <1> 	call	waitf		; go to beep delay 1/64 count
  2108 00001DCF FECB                <1> 	dec	bl		; (bl) length count expired?
  2109 00001DD1 75F2                <1> 	jnz	short g7	; no - continue beeping speaker
  2110                              <1> 	;
  2111                              <1> 	;pushf			; save interrupt status
  2112 00001DD3 FA                  <1> 	cli  	; 18/01/2014	; block interrupts during update
  2113 00001DD4 E461                <1> 	in	al, PORT_B	; get current port value
  2114                              <1>         ;or      al, not (GATE2+SPK2) ; isolate current speaker bits in case
  2115 00001DD6 0CFC                <1>         or      al, ~(GATE2+SPK2)
  2116 00001DD8 20C4                <1>         and	ah, al		; someone turned them off during beep
  2117 00001DDA 88E0                <1> 	mov	al, ah		; recover value of port
  2118                              <1>         ;or      al, not (GATE2+SPK2) ; force speaker data off
  2119 00001DDC 0CFC                <1> 	or 	al, ~(GATE2+SPK2) ; isolate current speaker bits in case
  2120 00001DDE E661                <1> 	out	PORT_B, al	; and stop speaker timer
  2121                              <1> 	;popf			; restore interrupt flag state
  2122 00001DE0 FB                  <1> 	sti
  2123 00001DE1 B90B040000          <1> 	mov	ecx, 1035	; force 1/64 second delay (short)
  2124 00001DE6 E80B000000          <1> 	call	waitf		; minimum delay between all beeps
  2125                              <1> 	;pushf			; save interrupt status
  2126 00001DEB FA                  <1> 	cli			; block interrupts during update
  2127 00001DEC E461                <1> 	in	al, PORT_B	; get current port value in case	
  2128 00001DEE 2403                <1> 	and	al, GATE2+SPK2	; someone turned them on
  2129 00001DF0 08E0                <1> 	or	al, ah		; recover value of port_b
  2130 00001DF2 E661                <1> 	out	PORT_B, al	; restore speaker status
  2131 00001DF4 9D                  <1> 	popf			; restore interrupt flag state
  2132                              <1> u12:	
  2133 00001DF5 C3                  <1> 	retn
  2134                              <1> 
  2135                              <1> REFRESH_BIT equ	00010000b 	; REFRESH TEST BIT
  2136                              <1> 
  2137                              <1> WAITF:
  2138                              <1> waitf:
  2139                              <1> 	; 30/08/2014 (Retro UNIX 386 v1)
  2140                              <1> 	; 03/12/2013
  2141                              <1> 	;
  2142                              <1> ;	push ax			; save work register (ah)	
  2143                              <1> ;waitf1:
  2144                              <1> 				; use timer 1 output bits
  2145                              <1> ;	in	al, PORT_B	; read current counter output status
  2146                              <1> ;	and	al, REFRESH_BIT	; mask for refresh determine bit
  2147                              <1> ;	cmp	al, ah		; did it just change
  2148                              <1> ;	je	short waitf1	; wait for a change in output line
  2149                              <1> ;	;
  2150                              <1> ;	mov	ah, al		; save new lflag state
  2151                              <1> ;	loop	waitf1		; decrement half cycles till count end		
  2152                              <1> ;	;
  2153                              <1> ;	pop	ax		; restore (ah)
  2154                              <1> ;	retn			; return (cx)=0
  2155                              <1> 
  2156                              <1> ; 06/02/2015 (unix386.s <-- dsectrm2.s)
  2157                              <1> ; 17/12/2014 (dsectrm2.s)
  2158                              <1> ; WAITF
  2159                              <1> ; /// IBM PC-XT Model 286 System BIOS Source Code - Test 4 - 06/10/85 ///
  2160                              <1> ;
  2161                              <1> ;---WAITF-----------------------------------------------------------------------
  2162                              <1> ;	FIXED TIME WAIT ROUTINE (HARDWARE CONTROLLED - NOT PROCESSOR)
  2163                              <1> ; ENTRY:
  2164                              <1> ;	(CX) =	COUNT OF 15.085737 MICROSECOND INTERVALS TO WAIT
  2165                              <1> ;	      	MEMORY REFRESH TIMER 1 OUTPUT USED AS REFERENCE
  2166                              <1> ; EXIT:
  2167                              <1> ;	       	AFTER (CX) TIME COUNT (PLUS OR MINUS 16 MICROSECONDS)
  2168                              <1> ;	(CX) = 0	
  2169                              <1> ;-------------------------------------------------------------------------------
  2170                              <1> 
  2171                              <1> ; Refresh period: 30 micro seconds (15-80 us)
  2172                              <1> ; (16/12/2014 - AWARDBIOS 1999 - ATORGS.ASM, WAIT_REFRESH)
  2173                              <1> 
  2174                              <1> ;WAITF:					; DELAY FOR (CX)*15.085737 US
  2175 00001DF6 6650                <1> 	PUSH	AX			; SAVE WORK REGISTER (AH)
  2176                              <1> 	; 16/12/2014
  2177                              <1> 	;shr	cx, 1			; convert to count of 30 micro seconds
  2178 00001DF8 D1E9                <1> 	shr	ecx, 1	; 21/02/2015
  2179                              <1> ;17/12/2014	
  2180                              <1> ;WAITF1:
  2181                              <1> ;	IN	AL, PORT_B   ;061h	; READ CURRENT COUNTER OUTPUT STATUS
  2182                              <1> ;	AND	AL, REFRESH_BIT	;00010000b ; MASK FOR REFRESH DETERMINE BIT
  2183                              <1> ;	CMP	AL, AH			; DID IT JUST CHANGE
  2184                              <1> ;	JE	short WAITF1		; WAIT FOR A CHANGE IN OUTPUT LINE
  2185                              <1> ;	MOV	AH, AL			; SAVE NEW FLAG STATE
  2186                              <1> ;	LOOP	WAITF1			; DECREMENT HALF CYCLES TILL COUNT END		
  2187                              <1> 	;
  2188                              <1> 	; 17/12/2014
  2189                              <1> 	;
  2190                              <1> 	; Modification from 'WAIT_REFRESH' procedure of AWARD BIOS - 1999
  2191                              <1> 	;
  2192                              <1> ;WAIT_REFRESH:  Uses port 61, bit 4 to have CPU speed independent waiting.
  2193                              <1> ;   	INPUT:  CX = number of refresh periods to wait
  2194                              <1> ;     	       (refresh periods = 1 per 30 microseconds on most machines)
  2195                              <1> WR_STATE_0:
  2196 00001DFA E461                <1> 	IN	AL,PORT_B		; IN AL,SYS1
  2197 00001DFC A810                <1> 	TEST	AL,010H
  2198 00001DFE 74FA                <1> 	JZ	SHORT WR_STATE_0
  2199                              <1> WR_STATE_1:
  2200 00001E00 E461                <1> 	IN	AL,PORT_B		; IN AL,SYS1
  2201 00001E02 A810                <1> 	TEST	AL,010H
  2202 00001E04 75FA                <1> 	JNZ	SHORT WR_STATE_1
  2203 00001E06 E2F2                <1>         LOOP    WR_STATE_0
  2204                              <1> 	;
  2205 00001E08 6658                <1> 	POP	AX			; RESTORE (AH)
  2206 00001E0A C3                  <1> 	RETn				; (CX) = 0
  2207                              <1> 
  2208                              <1> ; 09/07/2016
  2209                              <1> ; 01/07/2016
  2210                              <1> ; 24/06/2016
  2211                              <1> ; 23/06/2016 - TRDOS 386 (TRDOS v2.0)
  2212                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  2213                              <1> ;-------------------------------------------------------------------------------
  2214                              <1> ; WRITE_STRING								       :
  2215                              <1> ;	THIS ROUTINE WRITES A STRING OF CHARACTERS TO THE CRT.		       :
  2216                              <1> ; INPUT 								       :
  2217                              <1> ;	(AL) = WRITE STRING COMMAND  0 - 3				       :
  2218                              <1> ;	(BH) = DISPLAY PAGE (ACTIVE PAGE)				       :
  2219                              <1> ;	(CX) = COUNT OF CHARACTERS TO WRITE, IF (CX) = 0 THEN RETURN	       :
  2220                              <1> ;	(DX) = CURSOR POSITION FOR START OF STRING WRITE		       :
  2221                              <1> ;	(BL) = ATTRIBUTE OF CHARACTER TO WRITE IF (AL) = 0  OR	(AL) = 1       :
  2222                              <1> ;	(eBP) = SOURCE STRING OFFSET					       :
  2223                              <1> ; OUTPUT								       :
  2224                              <1> ;	NONE								       :
  2225                              <1> ;-------------------------------------------------------------------------------
  2226                              <1> 
  2227                              <1> ; AL = 00h: Assign all characters the attribute in BL; do not update cursor
  2228                              <1> ; AL = 01h: Assign all characters the attribute in BL; update cursor
  2229                              <1> ; AL = 02h: Use attributes in string; do not update cursor
  2230                              <1> ; AL = 03h: Use attributes in string; update cursor
  2231                              <1> 
  2232                              <1> WRITE_STRING:
  2233                              <1> 	; 12/09/2016
  2234                              <1> 	; 09/07/2016
  2235                              <1> 	;cmp	byte [CRT_MODE], 7 ; 6?!
  2236                              <1> 	;ja	VIDEO_RETURN		; not a valid function for VGA modes
  2237                              <1> 	;
  2238 00001E0B A2[54650100]        <1> 	mov	[w_str_cmd], al		; save (AL) command
  2239 00001E10 3C04                <1> 	CMP	AL, 4			; TEST FOR INVALID WRITE STRING OPTION
  2240 00001E12 0F8345F7FFFF        <1> 	JNB	VIDEO_RETURN		; IF OPTION INVALID THEN RETURN
  2241                              <1> 
  2242                              <1>         ;JCXZ   VIDEO_RETURN            ; IF ZERO LENGTH STRING THEN RETURN
  2243                              <1> 
  2244 00001E18 67E35E              <1>         jcxz    P55			; 01/07/2016
  2245                              <1> 
  2246                              <1> 
  2247                              <1> 	; 01/07/2016
  2248                              <1> 	;and	ecx, 0FFFFh
  2249                              <1> 	; ECX = byte count
  2250                              <1> 	;push	ecx
  2251 00001E1B 89EE                <1> 	mov	esi, ebp ; user buffer
  2252 00001E1D BF00000700          <1> 	mov	edi, Cluster_Buffer  ; system buffer
  2253 00001E22 E820CA0000          <1> 	call	transfer_from_user_buffer
  2254                              <1> 	;pop	ecx
  2255 00001E27 0F8230F7FFFF        <1> 	jc	VIDEO_RETURN
  2256                              <1> 	; ecx = transfer (byte) count = character count
  2257 00001E2D BD00000700          <1> 	mov	ebp, Cluster_Buffer
  2258                              <1> 	; 12/09/2016
  2259 00001E32 803D[225F0000]07    <1> 	cmp	byte [CRT_MODE], 7 ; 6?!
  2260 00001E39 0F879F000000        <1> 	ja	vga_write_string
  2261                              <1> 	;
  2262 00001E3F 0FB6F7              <1> 	movzx	esi, bh			; GET CURRENT CURSOR PAGE
  2263 00001E42 66D1E6              <1> 	SAL	SI,1			; CONVERT TO PAGE OFFSET  (SI= PAGE)
  2264                              <1> 	; *****
  2265 00001E45 66FFB6[DE580100]    <1> 	PUSH	word [eSI+CURSOR_POSN]	; SAVE CURRENT CURSOR POSITION IN STACK
  2266                              <1> 
  2267                              <1> 	;MOV	AX,0200H		; SET NEW CURSOR POSITION
  2268                              <1> 	;INT	10H
  2269                              <1> P50next:	
  2270 00001E4C 53                  <1> 	push	ebx ; ****
  2271 00001E4D 51                  <1> 	push	ecx ; ***
  2272 00001E4E 56                  <1> 	push	esi ; **
  2273 00001E4F 52                  <1> 	push	edx ; *
  2274 00001E50 E8FCFEFFFF          <1> 	call	_set_cpos
  2275                              <1> P50:
  2276 00001E55 8A4500              <1> 	MOV	AL, [eBP]		; GET CHARACTER FROM INPUT STRING
  2277 00001E58 45                  <1> 	INC	eBP			; BUMP POINTER TO CHARACTER
  2278                              <1> 
  2279                              <1> ;-----	TEST FOR SPECIAL CHARACTER'S
  2280                              <1> 
  2281 00001E59 3C08                <1> 	CMP	AL, 08H			; IS IT A BACKSPACE
  2282 00001E5B 740C                <1> 	JE	short P51		; BACK_SPACE
  2283 00001E5D 3C0D                <1> 	CMP	AL, 0Dh ; CR		; IS IT CARRIAGE RETURN
  2284 00001E5F 7408                <1> 	JE	short P51		; CAR_RET
  2285 00001E61 3C0A                <1> 	CMP	AL, 0Ah ; LF		; IS IT A LINE FEED
  2286 00001E63 7404                <1> 	JE	short P51		; LINE_FEED
  2287 00001E65 3C07                <1> 	CMP	AL, 07h			; IS IT A BELL
  2288 00001E67 7515                <1> 	JNE	short P52		; IF NOT THEN DO WRITE CHARACTER
  2289                              <1> P51:
  2290                              <1> 	;MOV	AH,0EH			; TTY_CHARACTER_WRITE
  2291                              <1> 	;INT	10H			; WRITE TTY CHARACTER TO THE CRT
  2292                              <1> 	
  2293 00001E69 E860FEFFFF          <1> 	call	_write_tty_m3
  2294                              <1> 
  2295 00001E6E 5A                  <1> 	pop	edx ; *
  2296 00001E6F 5E                  <1> 	pop	esi ; **
  2297                              <1> 
  2298 00001E70 668B96[DE580100]    <1> 	MOV	DX, [eSI+CURSOR_POSN]	; GET CURRENT CURSOR POSITION
  2299 00001E77 EB46                <1> 	JMP	SHORT P54		; SET CURSOR POSITION AND CONTINUE
  2300                              <1> P55:
  2301 00001E79 E9DFF6FFFF          <1> 	JMP	VIDEO_RETURN
  2302                              <1> P52:
  2303 00001E7E 66B90100            <1> 	MOV	CX, 1			; SET CHARACTER WRITE AMOUNT TO ONE
  2304 00001E82 803D[54650100]02    <1> 	CMP	byte [w_str_cmd], 2	; IS THE ATTRIBUTE IN THE STRING
  2305 00001E89 7204                <1> 	JB	short P53		; IF NOT THEN SKIP
  2306 00001E8B 8A5D00              <1> 	MOV	BL, [eBP]		; ELSE GET NEW ATTRIBUTE
  2307 00001E8E 45                  <1> 	INC	eBP			; BUMP STRING POINTER
  2308                              <1> P53:
  2309                              <1> 	;MOV	AH,09H			; GOT_CHARACTER
  2310                              <1> 	;INT	10H			; WRITE CHARACTER TO THE CRT
  2311                              <1> 
  2312 00001E8F E8AEFDFFFF          <1> 	call	_write_c_current
  2313                              <1> 	
  2314 00001E94 5A                  <1> 	pop	edx ; *	
  2315                              <1> 	
  2316 00001E95 0FB6F7              <1> 	movzx	esi, bh ; video page number (0 to 7)	
  2317 00001E98 889E[2B5F0000]      <1> 	mov	[esi+chr_attrib], bl ; color/attribute
  2318                              <1> 
  2319 00001E9E FEC2                <1> 	INC	DL			; INCREMENT COLUMN COUNTER
  2320 00001EA0 3A15[245F0000]      <1> 	CMP	DL, [CRT_COLS]		; IF COLS ARE WITHIN RANGE FOR THIS MODE
  2321 00001EA6 7217                <1> 	JB	short P54		;    THEN GO TO COLUMNS SET
  2322 00001EA8 FEC6                <1> 	INC	DH			; BUMP ROW COUNTER BY ONE
  2323 00001EAA 28D2                <1> 	SUB	DL, DL			; SET COLUMN COUNTER TO ZERO
  2324 00001EAC 80FE19              <1> 	CMP	DH, 25			; IF ROWS ARE LESS THAN 25 THEN
  2325 00001EAF 720E                <1> 	JB	short P54		; GO TO ROWS_COLUMNS_SET
  2326                              <1> 
  2327 00001EB1 66B80A0E            <1> 	MOV	AX,0E0AH		; ELSE SCROLL SCREEN
  2328                              <1> 	;INT	10H			; RESET ROW COUNTER TO 24
  2329                              <1> 
  2330 00001EB5 E814FEFFFF          <1> 	call	_write_tty_m3
  2331                              <1> 	
  2332 00001EBA 66BA0018            <1> 	mov	dx, 1800h		; Column = 0, Row = 24
  2333 00001EBE 5E                  <1> 	pop	esi ; **
  2334                              <1> P54:
  2335                              <1> 					; ROW_COLUMNS_SET
  2336                              <1> 	;MOV	AX,0200H		; SET NEW CURSOR POSITION COMMAND
  2337                              <1> 	;INT	10H			; ESTABLISH NEW CURSOR POSITION
  2338                              <1> 
  2339 00001EBF 59                  <1> 	pop	ecx ; ***
  2340 00001EC0 5B                  <1> 	pop	ebx ; ****
  2341                              <1> 
  2342                              <1> 	;LOOP	P50			; DO IT ONCE MORE UNTIL (CX) = ZERO
  2343 00001EC1 6649                <1> 	dec	cx
  2344 00001EC3 7587                <1> 	jnz	short P50next
  2345                              <1> 
  2346 00001EC5 665A                <1> 	POP	DX  ; *****		; RESTORE OLD CURSOR COORDINATES
  2347                              <1> 	
  2348 00001EC7 F605[54650100]01    <1> 	test	byte [w_str_cmd], 1	; IF CURSOR WAS NOT TO BE MOVED
  2349 00001ECE 0F8589F6FFFF        <1> 	JNZ	VIDEO_RETURN		; THEN EXIT WITHOUT RESETTING OLD VALUE
  2350                              <1> 	
  2351                              <1> 	;MOV	AX,0200H		; ELSE RESTORE OLD CURSOR POSITION
  2352                              <1> 	;INT	10H
  2353                              <1> 					; DONE - EXIT WRITE STRING
  2354 00001ED4 E878FEFFFF          <1> 	call	_set_cpos
  2355 00001ED9 E97FF6FFFF          <1> 	JMP	VIDEO_RETURN		; RETURN TO CALLER
  2356                              <1> 
  2357                              <1> vga_write_string:
  2358                              <1> 	; 12/09/2016 - TRDOS 386 (TRDOS v2.0)
  2359                              <1> 	;
  2360                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  2361                              <1> 	; vgabios-0.7a (2011)
  2362                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  2363                              <1> 	; 'vgabios.c', ' biosfn_write_string'
  2364                              <1> 
  2365                              <1> 	; INPUT 								  :
  2366                              <1> 	;	(AL) = WRITE STRING COMMAND  0 - 3				  :
  2367                              <1> 	;	(BH) = DISPLAY PAGE (ACTIVE PAGE)				  :
  2368                              <1> 	;	(CX) = COUNT OF CHARACTERS TO WRITE, IF (CX) = 0 THEN RETURN	  :
  2369                              <1> 	;	(DX) = CURSOR POSITION FOR START OF STRING WRITE		  :
  2370                              <1> 	;	(BL) = ATTRIBUTE OF CHARACTER TO WRITE IF (AL) = 0  OR	(AL) = 1  :
  2371                              <1> 	;	(eBP) = SOURCE STRING OFFSET					  :
  2372                              <1> 	; OUTPUT								  :
  2373                              <1> 	;	NONE								  :
  2374                              <1> 	;-------------------------------------------------------------------------;
  2375                              <1> 
  2376                              <1> 	; AL = 00h: Assign all characters the attribute in BL; do not update cursor
  2377                              <1> 	; AL = 01h: Assign all characters the attribute in BL; update cursor
  2378                              <1> 	; AL = 02h: Use attributes in string; do not update cursor
  2379                              <1> 	; AL = 03h: Use attributes in string; update cursor
  2380                              <1> 	
  2381                              <1> 	; biosfn_write_string(GET_AL(),GET_BH(),GET_BL(),CX,GET_DH(),GET_DL(),ES,BP);
  2382                              <1> 	; static void biosfn_write_string (flag,page,attr,count,row,col,seg,offset) 
  2383                              <1> 
  2384                              <1> 	; // Read curs info for the page
  2385                              <1>  	; biosfn_get_cursor_pos(page,&dummy,&oldcurs);
  2386                              <1> 	; bh = video page = 0
  2387                              <1> 	;movzx	esi, word [CURSOR_POSN] ; current cursor position for video page 0
  2388                              <1> 	
  2389                              <1> 	; // if row=0xff special case : use current cursor position
  2390                              <1> 	; if(row==0xff)
  2391                              <1> 	;  {col=oldcurs&0x00ff;
  2392                              <1> 	;   row=(oldcurs&0xff00)>>8;
  2393                              <1> 	;  }
  2394                              <1> 
  2395                              <1> 	;mov	al, [w_str_cmd]
  2396                              <1> 
  2397 00001EDE 80FEFF              <1> 	cmp	dh, 0FFh
  2398 00001EE1 7407                <1> 	je	short vga_wstr_1 ; user current cursor position
  2399                              <1> vga_wstr_0:
  2400                              <1> 	; set cursor position
  2401 00001EE3 668915[DE580100]    <1> 	mov	[CURSOR_POSN], dx ; save cursor pos for pg 0
  2402                              <1> vga_wstr_1:
  2403 00001EEA 66FF35[DE580100]    <1> 	push	word [CURSOR_POSN] ; *
  2404                              <1> 
  2405                              <1> 	; ebp = string offset in system buffer (user buffer was copied to)	
  2406                              <1> 	
  2407                              <1> 	; while(count--!=0)
  2408                              <1> 	;  {
  2409                              <1> 	;   car=read_byte(seg,offset++);
  2410                              <1> 	;   if((flag&0x02)!=0)
  2411                              <1> 	;    attr=read_byte(seg,offset++);
  2412                              <1> 	;    biosfn_write_teletype(car,page,attr,WITH_ATTR);
  2413                              <1> 	;  }
  2414                              <1> 
  2415                              <1> 	;push	eax ; **
  2416                              <1> 	;test	al, 2
  2417 00001EF1 F605[54650100]02    <1> 	test	byte [w_str_cmd], 2
  2418 00001EF8 751D                <1> 	jnz	short vga_wstr_3
  2419 00001EFA 881D[EF580100]      <1> 	mov	[ccolor], bl
  2420                              <1> vga_wstr_2:
  2421 00001F00 51                  <1> 	push	ecx
  2422 00001F01 8A4500              <1> 	mov	al, [ebp]
  2423 00001F04 E8CC0A0000          <1> 	call	vga_write_teletype
  2424 00001F09 59                  <1> 	pop	ecx
  2425 00001F0A 6649                <1> 	dec	cx
  2426 00001F0C 741E                <1> 	jz	short vga_wstr_4
  2427 00001F0E 45                  <1> 	inc	ebp
  2428 00001F0F 8A1D[EF580100]      <1> 	mov	bl, [ccolor]
  2429 00001F15 EBE9                <1> 	jmp	short vga_wstr_2
  2430                              <1> vga_wstr_3:
  2431 00001F17 51                  <1> 	push	ecx
  2432 00001F18 8A4500              <1> 	mov	al, [ebp]
  2433 00001F1B 45                  <1> 	inc	ebp
  2434 00001F1C 8A5D00              <1> 	mov	bl, [ebp]
  2435 00001F1F E8B10A0000          <1> 	call	vga_write_teletype
  2436 00001F24 59                  <1> 	pop	ecx
  2437 00001F25 6649                <1> 	dec	cx
  2438 00001F27 7403                <1> 	jz	short vga_wstr_4
  2439 00001F29 45                  <1> 	inc	ebp
  2440 00001F2A EBEB                <1> 	jmp	short vga_wstr_3
  2441                              <1> vga_wstr_4:
  2442                              <1> 	; // Set back curs pos 
  2443                              <1> 	; if((flag&0x01)==0)
  2444                              <1> 	;  biosfn_set_cursor_pos(page,oldcurs);
  2445                              <1> 	; }
  2446                              <1> 	;pop	eax ; **
  2447 00001F2C 665A                <1> 	pop	dx ; word [CURSOR_POSN] ; *
  2448                              <1> 	;test	al, 1
  2449 00001F2E F605[54650100]01    <1> 	test	byte [w_str_cmd], 1
  2450 00001F35 0F8522F6FFFF        <1> 	jnz	VIDEO_RETURN
  2451 00001F3B 668915[DE580100]    <1> 	mov 	[CURSOR_POSN], dx
  2452 00001F42 E916F6FFFF          <1> 	JMP	VIDEO_RETURN
  2453                              <1> 
  2454                              <1> ; 07/07/2016
  2455                              <1> ; 27/06/2016 - TRDOS 386 (TRDOS v2.0)
  2456                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  2457                              <1> ;------------------------------------------------------
  2458                              <1> ;  SCROLL UP
  2459                              <1> ;   THIS ROUTINE SCROLLS UP THE INFORMATION ON THE CRT
  2460                              <1> ; ENTRY ---
  2461                              <1> ;  CH,CL = UPPER LEFT CORNER OF REGION TO SCROLL
  2462                              <1> ;  DH,DL = LOWER RIGHT CORNER OF REGION TO SCROLL
  2463                              <1> ;   BOTH OF THE ABOVE ARE IN CHARACTER POSITIONS
  2464                              <1> ;  BH = FILL VALUE FOR BLANKED LINES
  2465                              <1> ;  AL = # LINES TO SCROLL (AL=0 MEANS BLANK THE ENTIRE FIELD)
  2466                              <1> ;  DS = DATA SEGMENT
  2467                              <1> ;  ES = REGEN SEGMENT
  2468                              <1> ; EXIT --
  2469                              <1> ;  NOTHING, THE SCREEN IS SCROLLED
  2470                              <1> ;--------------------------------------------------------
  2471                              <1> 
  2472                              <1> 	; cl = upper left column
  2473                              <1> 	; ch = upper left row
  2474                              <1> 	; dl = lower rigth column
  2475                              <1> 	; dh = lower right row
  2476                              <1> 	;
  2477                              <1> 	; al = line count (AL=0 means blank entire fields)
  2478                              <1> 	; bl = fill value for blanked lines	
  2479                              <1> 	; bh = unused
  2480                              <1> 
  2481                              <1> GRAPHICS_UP:
  2482                              <1> 	; 07/07/2016
  2483                              <1> 	;AH = Current video mode, [CRT_MODE]
  2484 00001F47 80FC07              <1> 	cmp	ah, 7
  2485 00001F4A 7766                <1> 	ja	short vga_graphics_up
  2486                              <1> 	;je	n0
  2487                              <1> 
  2488 00001F4C 88C7                <1> 	MOV	bh, al			; save line count in BH
  2489 00001F4E 6689C8              <1> 	MOV	AX, CX			; GET UPPER LEFT POSITION INTO AX REG
  2490                              <1> 
  2491                              <1> ;-----	USE CHARACTER SUBROUTINE FOR POSITIONING
  2492                              <1> ;-----	ADDRESS RETURNED IS MULTIPLIED BY 2 FROM CORRECT VALUE
  2493                              <1> 
  2494 00001F51 E8D9050000          <1> 	CALL	GRAPH_POSN
  2495 00001F56 0FB7F8              <1> 	MOVzx	eDI, AX			; SAVE RESULT AS DESTINATION ADDRESS
  2496                              <1> 
  2497                              <1> ;-----	DETERMINE SIZE OF WINDOW
  2498                              <1> 
  2499 00001F59 6629CA              <1> 	SUB	DX, CX
  2500 00001F5C 6681C20101          <1>         ADD     DX, 101h                ; ADJUST VALUES
  2501 00001F61 C0E602              <1> 	SAL	DH, 2			; MULTIPLY ROWS BY 4 AT 8 VERT DOTS/CHAR
  2502                              <1> 					; AND EVEN/ODD ROWS
  2503                              <1> ;-----	DETERMINE CRT MODE
  2504                              <1> 
  2505 00001F64 803D[225F0000]06    <1> 	CMP	byte [CRT_MODE], 6	; TEST FOR MEDIUM RES
  2506 00001F6B 7305                <1>         JNC     short _R7_              ; FIND_SOURCE
  2507                              <1> 
  2508                              <1> ;-----	MEDIUM RES UP
  2509 00001F6D D0E2                <1> 	SAL	DL, 1			; # COLUMNS * 2, SINCE 2 BYTES/CHAR
  2510 00001F6F 66D1E7              <1> 	SAL	DI, 1			; OFFSET *2 SINCE 2 BYTES/CHAR
  2511                              <1> 
  2512                              <1> ;-----	DETERMINE THE SOURCE ADDRESS IN THE BUFFER
  2513                              <1> _R7_:                                   ; FIND_SOURCE
  2514 00001F72 81C700800B00        <1> 	add	edi, 0B8000h
  2515 00001F78 C0E702              <1> 	sal	bh, 2			; multiply number of lines by 4
  2516 00001F7B 7431                <1>         JZ      short _R11              ; IF ZERO, THEN BLANK ENTIRE FIELD
  2517 00001F7D B050                <1> 	MOV	AL, 80			; 80 BYTES/ROW
  2518 00001F7F F6E7                <1> 	mul	bh			; determine offset to source
  2519 00001F81 0FB7F0              <1> 	movzx	esi, ax			; offset to source
  2520 00001F84 01FE                <1> 	add	eSI, eDI		; SET UP SOURCE
  2521 00001F86 88F4                <1> 	MOV	AH, DH			; NUMBER OF ROWS IN FIELD
  2522 00001F88 28FC                <1> 	sub	ah, bh			; determine number to move
  2523                              <1> 
  2524                              <1> ;-----	LOOP THROUGH, MOVING ONE ROW AT A TIME, BOTH EVEN AND ODD FIELDS
  2525                              <1> _R8:                                    ; ROW_LOOP
  2526 00001F8A E812040000          <1>         CALL    _R17                    ; MOVE ONE ROW
  2527 00001F8F 6681EEB01F          <1> 	SUB	SI, 2000h-80		; MOVE TO NEXT ROW
  2528 00001F94 6681EFB01F          <1> 	SUB	DI, 2000h-80
  2529 00001F99 FECC                <1> 	DEC	AH			; NUMBER OF ROWS TO MOVE
  2530 00001F9B 75ED                <1>         JNZ     short _R8               ; CONTINUE TILL ALL MOVED
  2531                              <1> 
  2532                              <1> ;-----	FILL IN THE VACATED LINE(S)
  2533                              <1> _R9:                                    ; CLEAR ENTRY
  2534 00001F9D 88D8                <1> 	mov	al, bl			; attribute to fill with
  2535                              <1> _R10_:
  2536 00001F9F E819040000          <1>         CALL    _R18                    ; CLEAR THAT ROW
  2537 00001FA4 6681EFB01F          <1> 	SUB	DI, 2000h-80		; POINT TO NEXT LINE
  2538 00001FA9 FECF                <1> 	dec	bh			; number of lines to fill
  2539 00001FAB 75F2                <1>         JNZ     short _R10_             ; CLEAR LOOP
  2540 00001FAD C3                  <1> 	retn				; EVERYYHING DONE
  2541                              <1> 
  2542                              <1> _R11:                                   ; BLANK_FIELD
  2543 00001FAE 88F7                <1> 	mov	bh, dh			; set blank count to everything in field
  2544 00001FB0 EBEB                <1>         JMP     short _R9               ; CLEAR THE FIELD
  2545                              <1> 
  2546                              <1> vga_graphics_up:
  2547                              <1> 	; 08/08/2016
  2548                              <1> 	; 07/08/2016
  2549                              <1> 	; 04/08/2016
  2550                              <1> 	; 01/08/2016
  2551                              <1> 	; 31/07/2016
  2552                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  2553                              <1> 	;
  2554                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  2555                              <1> 	; vgabios-0.7a (2011)
  2556                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  2557                              <1> 	; 'vgabios.c', 'biosfn_scroll'
  2558                              <1> 	;
  2559                              <1> 
  2560                              <1> 	; cl = upper left column
  2561                              <1> 	; ch = upper left row
  2562                              <1> 	; dl = lower rigth column
  2563                              <1> 	; dh = lower right row
  2564                              <1> 	;
  2565                              <1> 	; al = line count (AL=0 means blank entire fields)
  2566                              <1> 	; bl = fill value for blanked lines	
  2567                              <1> 	; bh = unused
  2568                              <1> 	;
  2569                              <1> 	; ah = [CRT_MODE], current video mode	
  2570                              <1> 
  2571 00001FB2 88C7                <1> 	mov	bh, al ; 31/07/2016
  2572 00001FB4 BE[465F0000]        <1> 	mov	esi, vga_g_modes
  2573 00001FB9 89F7                <1> 	mov	edi, esi
  2574 00001FBB 83C708              <1> 	add	edi, vga_g_mode_count
  2575                              <1> vga_g_up_0:
  2576 00001FBE AC                  <1> 	lodsb
  2577 00001FBF 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  2578 00001FC1 7405                <1> 	je	short vga_g_up_1
  2579 00001FC3 39FE                <1> 	cmp	esi, edi
  2580 00001FC5 72F7                <1> 	jb	short vga_g_up_0
  2581                              <1> 	;xor	bh, bh ; 31/07/2016)
  2582 00001FC7 C3                  <1> 	retn	; nothing to do
  2583                              <1> vga_g_up_1:
  2584 00001FC8 88F8                <1> 	mov	al, bh ; 31/07/2016
  2585 00001FCA 83C64F              <1> 	add	esi, vga_g_memmodel - (vga_g_modes + 1)  
  2586                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  2587                              <1> 	
  2588                              <1> 	; if(rlr>=nbrows)rlr=nbrows-1;
  2589                              <1>  	; if(clr>=nbcols)clr=nbcols-1;
  2590                              <1>  	; if(nblines>nbrows)nblines=0;
  2591                              <1>  	; cols=clr-cul+1;
  2592                              <1> 
  2593 00001FCD 3A35[2A5F0000]      <1> 	cmp	dh, [VGA_ROWS]
  2594 00001FD3 7208                <1> 	jb	short vga_g_up_2
  2595 00001FD5 8A35[2A5F0000]      <1> 	mov	dh, [VGA_ROWS]
  2596 00001FDB FECE                <1> 	dec	dh
  2597                              <1> vga_g_up_2:
  2598 00001FDD 3A15[245F0000]      <1> 	cmp	dl, [CRT_COLS]  ; = [VGA_COLS]
  2599 00001FE3 7208                <1> 	jb	short vga_g_up_3
  2600 00001FE5 8A15[245F0000]      <1> 	mov	dl, [CRT_COLS]
  2601 00001FEB FECA                <1> 	dec	dl
  2602                              <1> vga_g_up_3:	
  2603 00001FED 3A05[2A5F0000]      <1> 	cmp	al, [VGA_ROWS]
  2604 00001FF3 7602                <1> 	jna	short vga_g_up_4
  2605 00001FF5 28C0                <1> 	sub	al, al ; 0
  2606                              <1> vga_g_up_4:
  2607 00001FF7 88D7                <1> 	mov	bh, dl ; clr
  2608 00001FF9 28CF                <1> 	sub	bh, cl ; cul
  2609 00001FFB FEC7                <1> 	inc	bh ; cols = clr-cul+1
  2610                              <1> 
  2611 00001FFD 20C0                <1> 	and	al, al ; nblines = 0
  2612 00001FFF 755D                <1> 	jnz	short vga_g_up_6
  2613 00002001 20ED                <1> 	and	ch, ch ; rul = 0
  2614 00002003 7559                <1> 	jnz	short vga_g_up_6
  2615 00002005 20C9                <1> 	and	cl, cl ; cul = 0
  2616 00002007 7555                <1> 	jnz	short vga_g_up_6
  2617                              <1> 
  2618 00002009 6650                <1> 	push	ax
  2619 0000200B A0[2A5F0000]        <1> 	mov	al, [VGA_ROWS]
  2620 00002010 FEC8                <1> 	dec	al  
  2621 00002012 38C6                <1> 	cmp	dh, al ; rlr = nbrows-1
  2622 00002014 7546                <1> 	jne	short vga_g_up_5
  2623 00002016 A0[245F0000]        <1>         mov     al, [CRT_COLS]  ; = VGA_COLS
  2624 0000201B FEC8                <1> 	dec	al 
  2625 0000201D 38C2                <1>  	cmp	dl, al ; clr = nbcols-1
  2626 0000201F 753B                <1> 	jne	short vga_g_up_5
  2627 00002021 6658                <1> 	pop	ax
  2628                              <1> 
  2629 00002023 66B80502            <1> 	mov	ax, 0205h
  2630 00002027 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2631 0000202B 66EF                <1> 	out	dx, ax
  2632 0000202D A0[2A5F0000]        <1> 	mov	al, [VGA_ROWS]
  2633 00002032 8A25[245F0000]      <1> 	mov	ah, [CRT_COLS] ; = [VGA_COLS]
  2634 00002038 F6E4                <1> 	mul	ah
  2635 0000203A 0FB7D0              <1> 	movzx	edx, ax
  2636                              <1> 	; 08/08/2016
  2637 0000203D 0FB605[265F0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  2638 00002044 F7E2                <1> 	mul	edx
  2639                              <1> 	; eax = byte count	
  2640 00002046 89C1                <1> 	mov	ecx, eax
  2641                              <1> 	;; 07/08/2016
  2642                              <1> 	;shl	dx, 3 ; * 8 ; * [CHAR_HEIGHT]
  2643                              <1> 	;mov	ecx, edx
  2644 00002048 88D8                <1> 	mov	al, bl ; fill value for blanked lines
  2645 0000204A BF00000A00          <1> 	mov	edi, 0A0000h
  2646 0000204F F3AA                <1> 	rep	stosb		
  2647                              <1> 	
  2648 00002051 66B80500            <1> 	mov	ax, 5
  2649 00002055 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2650 00002059 66EF                <1> 	out	dx, ax ; 0005h	
  2651                              <1> 
  2652 0000205B C3                  <1> 	retn
  2653                              <1> 
  2654                              <1> vga_g_up_5:
  2655 0000205C 6658                <1> 	pop	ax
  2656                              <1> 
  2657                              <1> vga_g_up_6:
  2658                              <1> 	; [ESI] = VGA memory model number for current video mode
  2659                              <1>         ;
  2660                              <1>         ; LINEAR8 equ 5
  2661                              <1>         ; PLANAR4 equ 4
  2662                              <1>         ; PLANAR1 equ 3
  2663                              <1> 
  2664 0000205E 803E04              <1> 	cmp	byte [esi], PLANAR4
  2665 00002061 7424                <1> 	je	short vga_g_up_planar
  2666 00002063 803E03              <1> 	cmp	byte [esi], PLANAR1
  2667 00002066 741F                <1> 	je	short vga_g_up_planar
  2668                              <1> vga_g_up_linear8:
  2669                              <1> 	; 07/07/2016 (TEMPORARY)
  2670                              <1> 	;
  2671                              <1> 	; cl = upper left column ; cul
  2672                              <1> 	; ch = upper left row ; rul
  2673                              <1> 	; dl = lower rigth column ; clr
  2674                              <1> 	; dh = lower right row ; rlr
  2675                              <1> 
  2676                              <1> vga_g_up_l0:
  2677                              <1>  	;{for(i=rul;i<=rlr;i++)
  2678                              <1>   	; if((i+nblines>rlr)||(nblines==0))
  2679 00002068 08C0                <1> 	or	al, al
  2680 0000206A 7414                <1> 	jz	short vga_g_up_l2
  2681 0000206C 88C4                <1> 	mov	ah, al
  2682 0000206E 00EC                <1> 	add	ah, ch ; i+nblines
  2683                              <1> 	;jc	short vga_g_up_l2	
  2684 00002070 38F4                <1> 	cmp	ah, dh
  2685 00002072 770C                <1> 	ja	short vga_g_up_l2
  2686                              <1> 	; else
  2687                              <1> 	;  vgamem_copy_pl4(cul,i+nblines,i,cols,nbcols,cheight);
  2688 00002074 E8F2000000          <1> 	call	vgamem_copy_l8
  2689                              <1> vga_g_up_l1:
  2690 00002079 FEC5                <1> 	inc	ch
  2691 0000207B 38F5                <1> 	cmp	ch, dh
  2692 0000207D 76E9                <1> 	jna	short vga_g_up_l0
  2693 0000207F C3                  <1> 	retn
  2694                              <1> vga_g_up_l2:
  2695                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  2696 00002080 E850010000          <1> 	call	vgamem_fill_l8
  2697 00002085 EBF2                <1> 	jmp	short vga_g_up_l1
  2698                              <1> 
  2699                              <1> vga_g_up_planar:
  2700                              <1> 	; cl = upper left column ; cul
  2701                              <1> 	; ch = upper left row ; rul
  2702                              <1> 	; dl = lower rigth column ; clr
  2703                              <1> 	; dh = lower right row ; rlr
  2704                              <1> vga_g_up_pl0:
  2705                              <1>  	;{for(i=rul;i<=rlr;i++)
  2706                              <1>   	; if((i+nblines>rlr)||(nblines==0))
  2707 00002087 20C0                <1> 	and	al, al
  2708 00002089 7414                <1> 	jz	short vga_g_up_pl2	
  2709 0000208B 88C4                <1> 	mov	ah, al
  2710 0000208D 00EC                <1> 	add	ah, ch ; i+nblines
  2711                              <1> 	;jc	short vga_g_up_pl2
  2712 0000208F 38F4                <1> 	cmp	ah, dh
  2713 00002091 770C                <1> 	ja	short vga_g_up_pl2
  2714                              <1> 	; else
  2715                              <1> 	;  vgamem_copy_pl4(cul,i+nblines,i,cols,nbcols,cheight);
  2716 00002093 E80E000000          <1> 	call	vgamem_copy_pl4
  2717                              <1> vga_g_up_pl1:
  2718 00002098 FEC5                <1> 	inc	ch 
  2719 0000209A 38F5                <1> 	cmp	ch, dh
  2720 0000209C 76E9                <1> 	jna	short vga_g_up_pl0
  2721 0000209E C3                  <1> 	retn
  2722                              <1> vga_g_up_pl2:
  2723                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  2724 0000209F E870000000          <1> 	call	vgamem_fill_pl4
  2725 000020A4 EBF2                <1> 	jmp	short vga_g_up_pl1
  2726                              <1> 
  2727                              <1> vgamem_copy_pl4:
  2728                              <1> 	; 08/08/2016
  2729                              <1> 	; 07/08/2016
  2730                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  2731                              <1> 	;
  2732                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  2733                              <1> 	; vgabios-0.7a (2011)
  2734                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  2735                              <1> 	; 'vgabios.c', 'vgamem_copy_pl4'
  2736                              <1> 	;
  2737                              <1> 	; vgamem_copy_pl4(xstart,ysrc,ydest,cols,nbcols,cheight)
  2738                              <1> 	; cl = xstart, ah = ysrc (i+nblines), ch = ydest (i),
  2739                              <1> 	; bh = cols, [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight
  2740                              <1> 
  2741                              <1> 	; src=ysrc*cheight*nbcols+xstart;
  2742                              <1> 	; dest=ydest*cheight*nbcols+xstart;
  2743                              <1> 
  2744 000020A6 52                  <1> 	push	edx
  2745 000020A7 50                  <1> 	push	eax
  2746                              <1> 
  2747                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0105)
  2748 000020A8 66B80501            <1> 	mov	ax, 0105h
  2749 000020AC 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2750 000020B0 66EF                <1> 	out	dx, ax
  2751                              <1> 
  2752                              <1> 	; 07/08/2016
  2753                              <1>  	;mov     ah, [esp+1]
  2754                              <1> 	;movzx	edx, ah ; ysrc
  2755 000020B2 0FB6542401          <1> 	movzx	edx, byte [esp+1]
  2756                              <1> 	; 08/08/2016
  2757 000020B7 0FB605[265F0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  2758 000020BE 8A25[245F0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  2759 000020C4 F6E4                <1> 	mul	ah 
  2760                              <1> 	;; 07/08/2016
  2761                              <1> 	;movzx	eax, byte [CRT_COLS]
  2762                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  2763 000020C6 50                  <1> 	push	eax ; cheight * nbcols
  2764 000020C7 F7E2                <1> 	mul	edx ; * ysrc
  2765                              <1> 	; eax = ysrc * cheight * nbcols
  2766                              <1> 	; edx = 0
  2767 000020C9 88CA                <1> 	mov	dl, cl ; edx = xstart	
  2768 000020CB 01D0                <1>  	add	eax, edx
  2769 000020CD 89C6                <1> 	mov	esi, eax ; src
  2770 000020CF 88EA                <1> 	mov	dl, ch ; ydest
  2771 000020D1 58                  <1> 	pop	eax ; cheight * nbcols
  2772 000020D2 F7E2                <1> 	mul	edx
  2773                              <1> 	; eax = ydest * cheight * nbcols
  2774 000020D4 88CA                <1> 	mov	dl, cl ; edx = xstart	
  2775 000020D6 01D0                <1>  	add	eax, edx
  2776 000020D8 89C7                <1> 	mov	edi, eax ; dest
  2777                              <1> 	; esi = src
  2778                              <1> 	; edi = dest
  2779                              <1> 	; for(i=0;i<cheight;i++)
  2780                              <1>   	; {
  2781                              <1>    	;  memcpyb(0xa000,dest+i*nbcols,0xa000,src+i*nbcols,cols);
  2782                              <1>   	; }
  2783 000020DA 51                  <1> 	push	ecx
  2784 000020DB B900000A00          <1> 	mov	ecx, 0A0000h
  2785 000020E0 01CE                <1> 	add	esi, ecx
  2786 000020E2 01CF                <1> 	add	edi, ecx
  2787                              <1> 	; 08/08/2016
  2788 000020E4 8A35[265F0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  2789                              <1> 	;; 07/08/2016
  2790                              <1> 	;mov	dh, 8 ; 07/08/2016
  2791 000020EA 28D2                <1> 	sub	dl, dl ; i
  2792                              <1> vgamem_copy_pl4_0:
  2793 000020EC 56                  <1> 	push	esi
  2794 000020ED 57                  <1> 	push	edi
  2795 000020EE 0FB605[245F0000]    <1> 	movzx	eax, byte [CRT_COLS]
  2796 000020F5 F6E2                <1> 	mul	dl
  2797                              <1> 	; eax = i * nbcols
  2798 000020F7 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  2799 000020F9 01C6                <1> 	add	esi, eax
  2800 000020FB 0FB6CF              <1> 	movzx	ecx, bh ; cols
  2801 000020FE F3A4                <1> 	rep	movsb
  2802 00002100 5F                  <1> 	pop	edi
  2803 00002101 5E                  <1> 	pop	esi
  2804 00002102 FECE                <1> 	dec	dh
  2805 00002104 75E6                <1> 	jnz	short vgamem_copy_pl4_0
  2806                              <1> vgamem_copy_pl4_1:
  2807 00002106 59                  <1> 	pop	ecx
  2808                              <1> 
  2809                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  2810 00002107 66B80500            <1> 	mov	ax, 0005h
  2811 0000210B 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2812 0000210F 66EF                <1> 	out	dx, ax
  2813                              <1> 
  2814 00002111 58                  <1> 	pop	eax
  2815 00002112 5A                  <1> 	pop	edx
  2816                              <1> 
  2817 00002113 C3                  <1> 	retn	
  2818                              <1> 
  2819                              <1> vgamem_fill_pl4:
  2820                              <1> 	; 08/08/2016
  2821                              <1> 	; 07/08/2016
  2822                              <1> 	; 04/08/2016
  2823                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  2824                              <1> 	;
  2825                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  2826                              <1> 	; vgabios-0.7a (2011)
  2827                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  2828                              <1> 	; 'vgabios.c', 'vgamem_fill_pl4'
  2829                              <1> 	;
  2830                              <1> 	; vgamem_fill_pl4(xstart,ystart,cols,nbcols,cheight,attr)
  2831                              <1> 	; cl = xstart, edi = ch = ystart, bh = cols,
  2832                              <1> 	; [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight, attr = 0
  2833                              <1> 
  2834                              <1> 	; dest=ystart*cheight*nbcols+xstart;
  2835 00002114 52                  <1> 	push	edx
  2836 00002115 50                  <1> 	push	eax
  2837                              <1> 
  2838                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0205)
  2839 00002116 66B80502            <1> 	mov	ax, 0205h
  2840 0000211A 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2841 0000211E 66EF                <1> 	out	dx, ax
  2842                              <1> 
  2843                              <1>       	; 08/08/2016
  2844 00002120 0FB605[265F0000]    <1> 	movzx   eax, byte [CHAR_HEIGHT]
  2845 00002127 F6E5                <1> 	mul	ch
  2846                              <1> 	;; 07/08/2016
  2847                              <1> 	;movzx	eax, ch
  2848                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  2849 00002129 0FB615[245F0000]    <1> 	movzx	edx, byte [CRT_COLS] ; = [VGA_COLS]
  2850 00002130 F7E2                <1> 	mul	edx
  2851                              <1> 	; edx  = 0
  2852 00002132 88CA                <1> 	mov	dl, cl 
  2853 00002134 01D0                <1> 	add	eax, edx
  2854 00002136 89C7                <1> 	mov	edi, eax
  2855                              <1> 	; edi = dest
  2856                              <1> 	; for(i=0;i<cheight;i++)
  2857                              <1>   	; {
  2858                              <1>    	;  memsetb(0xa000,dest+i*nbcols,attr,cols);
  2859                              <1>   	; }
  2860 00002138 81C700000A00        <1> 	add	edi, 0A0000h
  2861 0000213E 51                  <1> 	push	ecx
  2862                              <1> 	; 08/08/2016
  2863 0000213F 8A35[265F0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  2864                              <1> 	;; 07/08/2016
  2865                              <1> 	;mov	dh, 8 ; 07/08/2016
  2866 00002145 28D2                <1> 	sub	dl, dl ; i
  2867                              <1> vgamem_fill_pl4_0:
  2868 00002147 57                  <1> 	push	edi
  2869 00002148 0FB605[245F0000]    <1> 	movzx	eax, byte [CRT_COLS]
  2870 0000214F F6E2                <1> 	mul	dl
  2871                              <1> 	; eax = i * nbcols
  2872 00002151 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  2873 00002153 88D8                <1> 	mov	al, bl ; attr ; 04/08/2016
  2874 00002155 0FB6CF              <1> 	movzx	ecx, bh ; cols
  2875 00002158 F3AA                <1>  	rep	stosb
  2876 0000215A 5F                  <1> 	pop	edi
  2877 0000215B 75EA                <1> 	jnz	short vgamem_fill_pl4_0
  2878                              <1> vgamem_fill_pl4_1:
  2879 0000215D 59                  <1> 	pop	ecx
  2880                              <1> 
  2881                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  2882 0000215E 66B80500            <1> 	mov	ax, 0005h
  2883 00002162 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2884 00002166 66EF                <1> 	out	dx, ax
  2885                              <1> 
  2886 00002168 58                  <1> 	pop	eax
  2887 00002169 5A                  <1> 	pop	edx 
  2888                              <1> 	
  2889 0000216A C3                  <1> 	retn
  2890                              <1> 
  2891                              <1> vgamem_copy_l8:
  2892                              <1> 	; 08/08/2016
  2893                              <1> 	; 07/08/2016
  2894                              <1> 	; 06/08/2016
  2895                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  2896                              <1> 	;
  2897                              <1> 	; TEMPORARY
  2898                              <1> 	;
  2899                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  2900                              <1> 	; vgabios-0.7a (2011)
  2901                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  2902                              <1> 	; 'vgabios.c', 'vgamem_copy_pl4'
  2903                              <1> 	;
  2904                              <1> 	; vgamem_copy_pl4(xstart,ysrc,ydest,cols,nbcols,cheight)
  2905                              <1> 	; cl = xstart, ah = ysrc (i+nblines), ch = ydest (i),
  2906                              <1> 	; bh = cols, [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight
  2907                              <1> 
  2908                              <1> 	; src=ysrc*cheight*nbcols+xstart;
  2909                              <1> 	; dest=ydest*cheight*nbcols+xstart;
  2910                              <1> 
  2911 0000216B 52                  <1> 	push	edx
  2912 0000216C 50                  <1> 	push	eax
  2913                              <1> 
  2914                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0105)
  2915                              <1> 	;mov	ax, 0105h
  2916                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2917                              <1> 	;out	dx, ax
  2918                              <1> 
  2919                              <1> 	;mov	ah, [esp+1]
  2920                              <1> 
  2921 0000216D 0FB6D4              <1> 	movzx	edx, ah ; ysrc
  2922                              <1> 	; 08/08/2016
  2923 00002170 0FB605[265F0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  2924 00002177 8A25[245F0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  2925 0000217D F6E4                <1> 	mul	ah 
  2926                              <1> 	;; 07/08/2016
  2927                              <1> 	;movzx	eax, byte [CRT_COLS]
  2928                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  2929 0000217F 50                  <1> 	push	eax ; cheight * nbcols
  2930 00002180 F7E2                <1> 	mul	edx ; * ysrc
  2931                              <1> 	; eax = ysrc * cheight * nbcols
  2932                              <1> 	; edx = 0
  2933 00002182 88CA                <1> 	mov	dl, cl ; edx = xstart
  2934 00002184 01D0                <1>  	add	eax, edx
  2935 00002186 89C6                <1> 	mov	esi, eax ; src
  2936 00002188 66C1E603            <1> 	shl	si, 3 ; * 8 ; 06/08/2016
  2937 0000218C 88EA                <1> 	mov	dl, ch ; ydest
  2938 0000218E 58                  <1> 	pop	eax ; cheight * nbcols
  2939 0000218F F7E2                <1> 	mul	edx
  2940                              <1> 	; eax = ydest * cheight * nbcols
  2941 00002191 88CA                <1> 	mov	dl, cl ; edx = xstart	
  2942 00002193 01D0                <1>  	add	eax, edx
  2943 00002195 89C7                <1> 	mov	edi, eax ; dest
  2944 00002197 66C1E703            <1> 	shl	di, 3 ; * 8 ; 06/08/2016
  2945                              <1> 	; esi = src
  2946                              <1> 	; edi = dest
  2947                              <1> 	; for(i=0;i<cheight;i++)
  2948                              <1>   	; {
  2949                              <1>    	;  memcpyb(0xa000,dest+i*nbcols,0xa000,src+i*nbcols,cols);
  2950                              <1>   	; }
  2951 0000219B 51                  <1> 	push	ecx
  2952 0000219C B900000A00          <1> 	mov	ecx, 0A0000h
  2953 000021A1 01CE                <1> 	add	esi, ecx
  2954 000021A3 01CF                <1> 	add	edi, ecx
  2955                              <1> 	; 08/08/2016
  2956 000021A5 8A35[265F0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  2957                              <1> 	;; 07/08/2016
  2958                              <1> 	;mov	dh, 8 ; 07/08/2016
  2959 000021AB 28D2                <1> 	sub	dl, dl ; i
  2960                              <1> vgamem_copy_l8_0:
  2961 000021AD 56                  <1> 	push	esi
  2962 000021AE 57                  <1> 	push	edi
  2963 000021AF 0FB605[245F0000]    <1> 	movzx	eax, byte [CRT_COLS]
  2964 000021B6 F6E2                <1> 	mul	dl
  2965                              <1> 	; eax = i * nbcols
  2966 000021B8 66C1E003            <1> 	shl	ax, 3 ; * 8 ; 06/08/2016
  2967 000021BC 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  2968 000021BE 01C6                <1> 	add	esi, eax
  2969 000021C0 0FB6CF              <1> 	movzx	ecx, bh ; cols
  2970 000021C3 66C1E103            <1> 	shl	cx, 3 ; * 8 ; 06/08/2016
  2971 000021C7 F3A4                <1> 	rep	movsb
  2972 000021C9 5F                  <1> 	pop	edi
  2973 000021CA 5E                  <1> 	pop	esi
  2974 000021CB FEC2                <1> 	inc	dl ; 06/08/2016
  2975 000021CD FECE                <1> 	dec	dh
  2976 000021CF 75DC                <1> 	jnz	short vgamem_copy_l8_0
  2977                              <1> vgamem_copy_l8_1:
  2978 000021D1 59                  <1> 	pop	ecx
  2979                              <1> 
  2980                              <1> 	;; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  2981                              <1> 	;mov	ax, 0005h
  2982                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  2983                              <1> 	;out	dx, ax
  2984                              <1> 
  2985 000021D2 58                  <1> 	pop	eax
  2986 000021D3 5A                  <1> 	pop	edx
  2987                              <1> 
  2988 000021D4 C3                  <1> 	retn
  2989                              <1> 
  2990                              <1> vgamem_fill_l8:
  2991                              <1> 	; 08/08/2016
  2992                              <1> 	; 07/08/2016
  2993                              <1> 	; 06/08/2016
  2994                              <1> 	; 04/08/2016
  2995                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  2996                              <1> 	;
  2997                              <1> 	; TEMPORARY
  2998                              <1> 	;
  2999                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  3000                              <1> 	; vgabios-0.7a (2011)
  3001                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  3002                              <1> 	; 'vgabios.c', 'vgamem_fill_pl4'
  3003                              <1> 	;
  3004                              <1> 	; vgamem_fill_pl4(xstart,ystart,cols,nbcols,cheight,attr)
  3005                              <1> 	; cl = xstart, edi = ch = ystart, bh = cols,
  3006                              <1> 	; [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight, attr = 0
  3007                              <1> 
  3008                              <1> 	; dest=ystart*cheight*nbcols+xstart;
  3009 000021D5 52                  <1> 	push	edx
  3010 000021D6 50                  <1> 	push	eax
  3011                              <1> 
  3012                              <1> 	;; outw(VGAREG_GRDC_ADDRESS, 0x0205)
  3013                              <1> 	;mov	ax, 0205h
  3014                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  3015                              <1> 	;out	dx, ax
  3016                              <1> 
  3017                              <1>         ; 08/08/2016
  3018 000021D7 0FB605[265F0000]    <1> 	movzx   eax, byte [CHAR_HEIGHT]
  3019 000021DE F6E5                <1> 	mul	ch
  3020                              <1> 	;; 07/08/2016
  3021                              <1> 	;movzx	eax, ch
  3022                              <1> 	;shl	ax, 3 ; * 8 ; * [CHAR_HEIGHT]
  3023 000021E0 0FB615[245F0000]    <1> 	movzx	edx, byte [CRT_COLS] ; = [VGA_COLS]
  3024 000021E7 F7E2                <1> 	mul	edx
  3025                              <1> 	; edx  = 0
  3026 000021E9 88CA                <1> 	mov	dl, cl 
  3027 000021EB 01D0                <1> 	add	eax, edx
  3028 000021ED 89C7                <1> 	mov	edi, eax
  3029 000021EF 66C1E703            <1> 	shl	di, 3 ; * 8 ; 06/08/2016
  3030                              <1> 	; edi = dest
  3031                              <1> 	; for(i=0;i<cheight;i++)
  3032                              <1>   	; {
  3033                              <1>    	;  memsetb(0xa000,dest+i*nbcols,attr,cols);
  3034                              <1>   	; }
  3035 000021F3 81C700000A00        <1> 	add	edi, 0A0000h
  3036 000021F9 51                  <1> 	push	ecx
  3037                              <1> 	; 08/08/2016
  3038 000021FA 8A35[265F0000]      <1> 	mov	dh, [CHAR_HEIGHT]
  3039                              <1> 	;; 07/08/2016
  3040                              <1> 	;mov	dh, 8 ; 07/08/2016
  3041 00002200 28D2                <1> 	sub	dl, dl ; i
  3042                              <1> vgamem_fill_l8_0:
  3043 00002202 57                  <1> 	push	edi
  3044 00002203 0FB605[245F0000]    <1> 	movzx	eax, byte [CRT_COLS]
  3045 0000220A F6E2                <1> 	mul	dl
  3046                              <1> 	; eax = i * nbcols
  3047 0000220C 66C1E003            <1> 	shl	ax, 3 ; * 8 ; 06/08/2016
  3048 00002210 01C7                <1> 	add	edi, eax ; dest+i*nbcols
  3049 00002212 88D8                <1> 	mov	al, bl ; attr ; 04/08/2016
  3050 00002214 0FB6CF              <1> 	movzx	ecx, bh ; cols
  3051 00002217 66C1E103            <1> 	shl	cx, 3 ; * 8 ; 06/08/2016
  3052 0000221B F3AA                <1>  	rep	stosb
  3053 0000221D 5F                  <1> 	pop	edi
  3054 0000221E FEC2                <1> 	inc	dl ; 06/08/2016
  3055 00002220 FECE                <1> 	dec	dh
  3056 00002222 75DE                <1> 	jnz	short vgamem_fill_l8_0
  3057                              <1> vgamem_fill_l8_1:
  3058 00002224 59                  <1> 	pop	ecx
  3059                              <1> 
  3060                              <1> 	;; outw(VGAREG_GRDC_ADDRESS, 0x0005);
  3061                              <1> 	;mov	ax, 0005h
  3062                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  3063                              <1> 	;out	dx, ax
  3064                              <1> 
  3065 00002225 58                  <1> 	pop	eax
  3066 00002226 5A                  <1> 	pop	edx 
  3067                              <1> 
  3068 00002227 C3                  <1> 	retn
  3069                              <1> 
  3070                              <1> vga_graphics_down:
  3071                              <1> 	; 08/08/2016
  3072                              <1> 	; 07/08/2016
  3073                              <1> 	; 31/07/2016
  3074                              <1> 	; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
  3075                              <1> 	;
  3076                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  3077                              <1> 	; vgabios-0.7a (2011)
  3078                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  3079                              <1> 	; 'vgabios.c', 'biosfn_scroll'
  3080                              <1> 	;
  3081                              <1> 
  3082                              <1> 	; cl = upper left column
  3083                              <1> 	; ch = upper left row
  3084                              <1> 	; dl = lower rigth column
  3085                              <1> 	; dh = lower right row
  3086                              <1> 	;
  3087                              <1> 	; al = line count (AL=0 means blank entire fields)
  3088                              <1> 	; bl = fill value for blanked lines	
  3089                              <1> 	; bh = unused
  3090                              <1> 	;
  3091                              <1> 	; ah = [CRT_MODE], current video mode	
  3092                              <1> 
  3093 00002228 FC                  <1>         cld     ; !!! Clear direction flag !!! 
  3094                              <1> 
  3095 00002229 88C7                <1> 	mov	bh, al ; 31/07/2016
  3096                              <1> 
  3097 0000222B BE[3E5F0000]        <1> 	mov	esi, vga_modes
  3098 00002230 89F7                <1> 	mov	edi, esi
  3099 00002232 83C710              <1> 	add	edi, vga_mode_count
  3100                              <1> vga_g_down_0:
  3101 00002235 AC                  <1> 	lodsb
  3102 00002236 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  3103 00002238 7405                <1> 	je	short vga_g_down_1
  3104 0000223A 39FE                <1> 	cmp	esi, edi
  3105 0000223C 72F7                <1> 	jb	short vga_g_down_0
  3106                              <1> 	; xor 	bh, bh	; 31/07/2016
  3107 0000223E C3                  <1> 	retn	; nothing to do
  3108                              <1> vga_g_down_1:
  3109 0000223F 88F8                <1> 	mov	al, bh ; 31/07/2016
  3110 00002241 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  3111                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  3112                              <1> 	
  3113                              <1> 	; if(rlr>=nbrows)rlr=nbrows-1;
  3114                              <1>  	; if(clr>=nbcols)clr=nbcols-1;
  3115                              <1>  	; if(nblines>nbrows)nblines=0;
  3116                              <1>  	; cols=clr-cul+1;
  3117                              <1> 
  3118 00002244 3A35[2A5F0000]      <1> 	cmp	dh, [VGA_ROWS]
  3119 0000224A 7208                <1> 	jb	short vga_g_down_2
  3120 0000224C 8A35[2A5F0000]      <1> 	mov	dh, [VGA_ROWS]
  3121 00002252 FECE                <1> 	dec	dh
  3122                              <1> vga_g_down_2:
  3123 00002254 3A15[245F0000]      <1> 	cmp	dl, [CRT_COLS]  ; = [VGA_COLS]
  3124 0000225A 7208                <1> 	jb	short vga_g_down_3
  3125 0000225C 8A15[245F0000]      <1> 	mov	dl, [CRT_COLS]
  3126 00002262 FECA                <1> 	dec	dl
  3127                              <1> vga_g_down_3:	
  3128 00002264 3A05[2A5F0000]      <1> 	cmp	al, [VGA_ROWS]
  3129 0000226A 7602                <1> 	jna	short vga_g_down_4
  3130 0000226C 28C0                <1> 	sub	al, al ; 0
  3131                              <1> vga_g_down_4:
  3132 0000226E 88F7                <1> 	mov	bh, dh ; clr
  3133 00002270 28CF                <1> 	sub	bh, cl ; cul
  3134 00002272 FEC7                <1> 	inc	bh ; cols = clr-cul+1
  3135                              <1> 
  3136 00002274 20C0                <1> 	and	al, al ; nblines = 0
  3137 00002276 755B                <1> 	jnz	short vga_g_down_6
  3138 00002278 20ED                <1> 	and	ch, ch ; rul = 0
  3139 0000227A 7557                <1> 	jnz	short vga_g_down_6
  3140 0000227C 20C9                <1> 	and	cl, cl ; cul = 0
  3141 0000227E 7553                <1> 	jnz	short vga_g_down_6
  3142                              <1> 
  3143 00002280 6650                <1> 	push	ax
  3144 00002282 A0[2A5F0000]        <1> 	mov	al, [VGA_ROWS]
  3145 00002287 FEC8                <1> 	dec	al  
  3146 00002289 38C6                <1> 	cmp	dh, al ; rlr = nbrows-1
  3147 0000228B 7544                <1> 	jne	short vga_g_down_5
  3148 0000228D A0[245F0000]        <1>         mov     al, [CRT_COLS]  ; = VGA_COLS
  3149 00002292 FEC8                <1> 	dec	al 
  3150 00002294 38C2                <1>  	cmp	dl, al ; clr = nbcols-1
  3151 00002296 7539                <1> 	jne	short vga_g_down_5
  3152 00002298 6658                <1> 	pop	ax
  3153                              <1> 
  3154 0000229A 66B80502            <1> 	mov	ax, 0205h
  3155 0000229E 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  3156 000022A2 66EF                <1> 	out	dx, ax
  3157 000022A4 A0[2A5F0000]        <1> 	mov	al, [VGA_ROWS]
  3158 000022A9 8A25[245F0000]      <1> 	mov	ah, [CRT_COLS] ; = [VGA_COLS]
  3159 000022AF F6E4                <1> 	mul	ah
  3160 000022B1 0FB7D0              <1> 	movzx	edx, ax
  3161                              <1> 	; 08/08/2016
  3162 000022B4 0FB605[265F0000]    <1> 	movzx	eax, byte [CHAR_HEIGHT]
  3163 000022BB F7E2                <1> 	mul	edx
  3164                              <1> 	; eax = byte count	
  3165 000022BD 89C1                <1> 	mov	ecx, eax
  3166                              <1> 	;; 07/08/2016
  3167                              <1> 	;shl	dx, 3 ; * 8 ; * [CHAR_HEIGHT]
  3168                              <1> 	;mov	ecx, edx
  3169 000022BF 88D8                <1> 	mov	al, bl ; fill value for blanked lines
  3170 000022C1 BF00000A00          <1> 	mov	edi, 0A0000h
  3171 000022C6 F3AA                <1> 	rep	stosb			
  3172                              <1> 	
  3173 000022C8 B005                <1> 	mov	al, 5
  3174 000022CA 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  3175 000022CE 66EF                <1> 	out	dx, ax ; 0005h	
  3176                              <1> 
  3177 000022D0 C3                  <1> 	retn
  3178                              <1> 
  3179                              <1> vga_g_down_5:
  3180 000022D1 6658                <1> 	pop	ax
  3181                              <1> 
  3182                              <1> vga_g_down_6:
  3183                              <1> 	; [ESI] = VGA memory model number for current video mode
  3184                              <1>         ;
  3185                              <1>         ; LINEAR8 equ 5
  3186                              <1>         ; PLANAR4 equ 4
  3187                              <1>         ; PLANAR1 equ 3
  3188                              <1> 
  3189 000022D3 803E04              <1> 	cmp	byte [esi], PLANAR4
  3190 000022D6 742C                <1> 	je	short vga_g_down_planar
  3191 000022D8 803E03              <1> 	cmp	byte [esi], PLANAR1
  3192 000022DB 7427                <1> 	je	short vga_g_down_planar
  3193                              <1> vga_g_down_linear8:
  3194                              <1> 	; 07/07/2016 (TEMPORARY)
  3195                              <1> 	;
  3196                              <1> 	; cl = upper left column ; cul
  3197                              <1> 	; ch = upper left row ; rul
  3198                              <1> 	; dl = lower rigth column ; clr
  3199                              <1> 	; dh = lower right row ; rlr
  3200                              <1> 
  3201                              <1> vga_g_down_l0:
  3202                              <1> 	;{for(i=rlr;i>=rul;i--)
  3203                              <1>         ; if((i<rul+nblines)||(nblines==0))
  3204 000022DD 08C0                <1> 	or	al, al
  3205 000022DF 741C                <1> 	jz	short vga_g_down_l2
  3206 000022E1 88C4                <1> 	mov	ah, al
  3207 000022E3 00EC                <1> 	add	ah, ch
  3208                              <1> 	;jc	short vga_g_down_l2	
  3209 000022E5 86EE                <1> 	xchg	ch, dh
  3210 000022E7 38E5                <1> 	cmp	ch, ah
  3211 000022E9 7212                <1> 	jb	short vga_g_down_l2
  3212 000022EB 88EC                <1> 	mov	ah, ch
  3213 000022ED 28C4                <1> 	sub	ah, al ; ah = i - nblines
  3214                              <1> 	; else
  3215                              <1> 	; vgamem_copy_pl4(cul,i,i-nblines,cols,nbcols,cheight);
  3216 000022EF E877FEFFFF          <1> 	call	vgamem_copy_l8
  3217                              <1> vga_g_down_l1:
  3218 000022F4 86F5                <1> 	xchg	dh, ch
  3219 000022F6 FECE                <1> 	dec	dh 
  3220 000022F8 38EE                <1> 	cmp	dh, ch
  3221 000022FA 73E1                <1> 	jnb	short vga_g_down_l0
  3222 000022FC C3                  <1> 	retn
  3223                              <1> 
  3224                              <1> vga_g_down_l2:
  3225                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  3226 000022FD E8D3FEFFFF          <1> 	call	vgamem_fill_l8
  3227 00002302 EBF0                <1> 	jmp	short vga_g_down_l1
  3228                              <1> 		 
  3229                              <1> vga_g_down_planar:
  3230                              <1> 	; cl = upper left column ; cul
  3231                              <1> 	; ch = upper left row ; rul
  3232                              <1> 	; dl = lower rigth column ; clr
  3233                              <1> 	; dh = lower right row ; rlr
  3234                              <1> vga_g_down_pl0:
  3235                              <1>  	;{for(i=rlr;i>=rul;i--)
  3236                              <1>         ; if((i<rul+nblines)||(nblines==0))
  3237 00002304 08C0                <1> 	or	al, al
  3238 00002306 741C                <1> 	jz	short vga_g_down_pl2
  3239 00002308 88C4                <1> 	mov	ah, al
  3240 0000230A 00EC                <1> 	add	ah, ch
  3241                              <1> 	;jc	short vga_g_down_pl2	
  3242 0000230C 86EE                <1> 	xchg	ch, dh
  3243 0000230E 38E5                <1> 	cmp	ch, ah
  3244 00002310 7212                <1> 	jb	short vga_g_down_pl2
  3245 00002312 88EC                <1> 	mov	ah, ch
  3246 00002314 28C4                <1> 	sub	ah, al ; ah = i - nblines
  3247                              <1> 	; else
  3248                              <1> 	; vgamem_copy_pl4(cul,i,i-nblines,cols,nbcols,cheight);
  3249 00002316 E88BFDFFFF          <1> 	call	vgamem_copy_pl4
  3250                              <1> vga_g_down_pl1:
  3251 0000231B 86F5                <1> 	xchg	dh, ch
  3252 0000231D FECE                <1> 	dec	dh 
  3253 0000231F 38EE                <1> 	cmp	dh, ch
  3254 00002321 73E1                <1> 	jnb	short vga_g_down_pl0
  3255 00002323 C3                  <1> 	retn
  3256                              <1> 
  3257                              <1> vga_g_down_pl2:
  3258                              <1> 	; vgamem_fill_pl4(cul,i,cols,nbcols,cheight,attr);
  3259 00002324 E8EBFDFFFF          <1> 	call	vgamem_fill_pl4
  3260 00002329 EBF0                <1> 	jmp	short vga_g_down_pl1
  3261                              <1> 
  3262                              <1> ; 07/07/2016
  3263                              <1> ; 27/06/2016 - TRDOS 386 (TRDOS v2.0)
  3264                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3265                              <1> ;------------------------------------------------------
  3266                              <1> ; SCROLL DOWN
  3267                              <1> ;  THIS ROUTINE SCROLLS DOWN THE INFORMATION ON THE CRT
  3268                              <1> ; ENTRY --
  3269                              <1> ;  CH,CL = UPPER LEFT CORNER OF REGION TO SCROLL
  3270                              <1> ;  DH,DL = LOWER RIGHT CORNER OF REGION TO SCROLL
  3271                              <1> ;   BOTH OF THE ABOVE ARE IN CHARACTER POSITIONS
  3272                              <1> ;  BH = FILL VALUE FOR BLANKED LINES
  3273                              <1> ;  AL = # LINES TO SCROLL (AL=0 MEANS BLANK THE ENTIRE FIELD)
  3274                              <1> ;  DS = DATA SEGMENT
  3275                              <1> ;  ES = REGEN SEGMENT
  3276                              <1> ; EXIT --
  3277                              <1> ;  NOTHING, THE SCREEN IS SCROLLED
  3278                              <1> ;--------------------------------------------------------
  3279                              <1> 
  3280                              <1> 	; cl = upper left column
  3281                              <1> 	; ch = upper left row
  3282                              <1> 	; dl = lower rigth column
  3283                              <1> 	; dh = lower right row
  3284                              <1> 	;
  3285                              <1> 	; al = line count (AL=0 means blank entire fields)
  3286                              <1> 	; bl = fill value for blanked lines	
  3287                              <1> 	; bh = unused
  3288                              <1> 
  3289                              <1> GRAPHICS_DOWN:
  3290                              <1> 	; 07/07/2016
  3291                              <1> 	;AH = Current video mode, [CRT_MODE]
  3292                              <1> 	;STD				; SET DIRECTION
  3293 0000232B 80FC07              <1> 	cmp	ah, 7
  3294 0000232E 0F87F4FEFFFF        <1>         ja      vga_graphics_down
  3295                              <1> 	;je	_n0
  3296                              <1> 
  3297 00002334 88C7                <1> 	MOV	bh, al			; save line count in BH
  3298 00002336 6689D0              <1> 	MOV	AX, DX			; GET LOWER RIGHT POSITION INTO AX REG
  3299                              <1> 
  3300                              <1> ;-----	USE CHARACTER SUBROUTINE FOR POSITIONING
  3301                              <1> ;-----	ADDRESS RETURNED IS MULTIPLIED BY 2 FROM CORRECT VALUE
  3302                              <1> 
  3303 00002339 E8F1010000          <1> 	CALL	GRAPH_POSN
  3304 0000233E 0FB7F8              <1> 	MOVzx	eDI, AX			; SAVE RESULT AS DESTINATION ADDRESS
  3305                              <1> 
  3306                              <1> ;-----	DETERMINE SIZE OF WINDOW
  3307                              <1> 
  3308 00002341 6629CA              <1> 	SUB	DX, CX
  3309 00002344 6681C20101          <1>         ADD     DX, 101h                ; ADJUST VALUES
  3310 00002349 C0E602              <1> 	SAL	DH, 2			; MULTIPLY ROWS BY 4 AT 8 VERT DOTS/CHAR
  3311                              <1> 					; AND EVEN/ODD ROWS
  3312                              <1> 
  3313                              <1> ;-----	DETERMINE CRT MODE
  3314                              <1> 
  3315 0000234C 803D[225F0000]06    <1> 	CMP	byte [CRT_MODE], 6	; TEST FOR MEDIUM RES
  3316 00002353 7307                <1>         JNC     short _R12              ; FIND_SOURCE_DOWN
  3317                              <1> 
  3318                              <1> ;-----	MEDIUM RES DOWN
  3319 00002355 D0E2                <1> 	SAL	DL, 1			; # COLUMNS * 2, SINCE 2 BYTES/CHAR
  3320 00002357 66D1E7              <1> 	SAL	DI, 1			; OFFSET *2 SINCE 2 BYTES/CHAR
  3321 0000235A 6647                <1> 	INC	DI			; POINT TO LAST BYTE
  3322                              <1> 
  3323                              <1> ;-----	DETERMINE THE SOURCE ADDRESS IN THE BUFFER
  3324                              <1> 
  3325                              <1> _R12:                                   ; FIND_SOURCE_DOWN
  3326 0000235C 81C700800B00        <1> 	add	edi, 0B8000h		
  3327 00002362 6681C7F000          <1> 	ADD	DI, 240			; POINT TO LAST ROW OF PIXELS
  3328 00002367 C0E702              <1> 	sal	bh, 2			; multiply number of lines by 4
  3329 0000236A 74(06)              <1> 	JZ	short 6			; IF ZERO, THEN BLANK ENTIRE FIELD
  3330 0000236C B050                <1> 	MOV	AL, 80			; 80 BYTES/ROW
  3331 0000236E F6E7                <1> 	mul	bh			; determine offset to source
  3332 00002370 89FE                <1> 	MOV	eSI, eDI		; SET UP SOURCE
  3333 00002372 6629C6              <1> 	SUB	SI, AX			; SUBTRACT THE OFFSET
  3334 00002375 88F4                <1> 	MOV	AH, DH			; NUMBER OF ROWS IN FIELD
  3335 00002377 28FC                <1> 	sub	ah, bh			; determine number to move
  3336                              <1> 
  3337                              <1> ;-----	LOOP THROUGH, MOVING ONE ROW AT A TIME, BOTH EVEN AND ODD FIELDS
  3338                              <1> 
  3339                              <1> _R13:                                   ; ROW_LOOP_DOWN
  3340 00002379 E823000000          <1>         CALL    _R17                    ; MOVE ONE ROW
  3341 0000237E 6681EE5020          <1> 	SUB	SI, 2000h+80		; MOVE TO NEXT ROW
  3342 00002383 6681EF5020          <1> 	SUB	DI, 2000h+80
  3343 00002388 FECC                <1> 	DEC	AH			; NUMBER OF ROWS TO MOVE
  3344 0000238A 75ED                <1>         JNZ     short _R13              ; CONTINUE TILL ALL MOVED
  3345                              <1> 
  3346                              <1> ;-----	FILL IN THE VACATED LINE(S)
  3347                              <1> _R14:                                   ; CLEAR_ENTRY_DOWN
  3348 0000238C 88D8                <1> 	mov	al, bl			; attribute to fill with
  3349                              <1> _R15_:                                  ; CLEAR_LOOP_DOWN
  3350 0000238E E82A000000          <1> 	CALL	_R18			; CLEAR A ROW
  3351 00002393 6681EF5020          <1> 	SUB	DI, 2000h+80		; POINT TO NEXT LINE
  3352 00002398 FECF                <1> 	dec	bh			; number of lines to fill
  3353 0000239A 75F2                <1>         JNZ     short _R15_             ; CLEAR_LOOP_DOWN
  3354                              <1> 
  3355 0000239C C3                  <1> 	retn				; EVERYYHING DONE
  3356                              <1> 
  3357                              <1> _R16:                                   ; BLANK_FIELD_DOWN
  3358 0000239D 88F7                <1> 	mov	bh, dh			; set blank count to everything in field
  3359 0000239F EBEB                <1>         JMP     short _R14              ; CLEAR THE FIELD
  3360                              <1> 
  3361                              <1> ; 27/06/2016 - TRDOS 386 (TRDOS v2.0)
  3362                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3363                              <1> 
  3364                              <1> ;-----	ROUTINE TO MOVE ONE ROW OF INFORMATION
  3365                              <1> 
  3366                              <1> _R17:
  3367 000023A1 0FB6CA              <1> 	MOVzx	ecx, DL			; NUMBER OF BYTES IN THE ROW
  3368 000023A4 56                  <1> 	PUSH	eSI
  3369 000023A5 57                  <1> 	PUSH	eDI			; SAVE POINTERS
  3370 000023A6 F3A4                <1> 	REP	MOVSB			; MOVE THE EVEN FIELD
  3371 000023A8 5F                  <1> 	POP	eDI
  3372 000023A9 5E                  <1> 	POP	eSI
  3373 000023AA 6681C60020          <1> 	ADD	SI, 2000h
  3374 000023AF 6681C70020          <1> 	ADD	DI, 2000h		; POINT TO THE ODD FIELD
  3375 000023B4 56                  <1> 	PUSH	eSI
  3376 000023B5 57                  <1> 	PUSH	eDI			; SAVE THE POINTERS
  3377 000023B6 88D1                <1> 	MOV	CL, DL			; COUNT BACK
  3378 000023B8 F3A4                <1> 	REP	MOVSB			; MOVE THE ODD FIELD
  3379 000023BA 5F                  <1> 	POP	eDI
  3380 000023BB 5E                  <1> 	POP	eSI			; POINTERS BACK
  3381 000023BC C3                  <1> 	RETn				; RETURN TO CALLER
  3382                              <1> 
  3383                              <1> ;-----	CLEAR A SINGLE ROW
  3384                              <1> 
  3385                              <1> _R18:
  3386 000023BD 0FB6CA              <1> 	MOVzx	ecx, DL			; NUMBER OF BYTES IN FIELD
  3387 000023C0 57                  <1> 	PUSH	eDI			; SAVE POINTER
  3388 000023C1 F3AA                <1> 	REP	STOSB			; STORE THE NEW VALUE
  3389 000023C3 5F                  <1> 	POP	eDI			; POINTER BACK
  3390 000023C4 6681C70020          <1> 	ADD	DI, 2000h		; POINT TO ODD FIELD
  3391 000023C9 57                  <1> 	PUSH	eDI
  3392 000023CA 88D1                <1> 	MOV	CL, DL
  3393 000023CC F3AA                <1> 	REP	STOSB			; FILL THE ODD FIELD
  3394 000023CE 5F                  <1> 	POP	eDI
  3395 000023CF C3                  <1> 	RETn				; RETURN TO CALLER
  3396                              <1> 
  3397                              <1> ; 04/07/2016
  3398                              <1> ; 01/07/2016
  3399                              <1> ; 30/06/2016 - TRDOS 386 (TRDOS v2.0)
  3400                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3401                              <1> ;--------------------------------------------------
  3402                              <1> ; GRAPHICS WRITE
  3403                              <1> ;  THIS ROUTINE WRITES THE ASCII CHARACTER TO THE CURRENT
  3404                              <1> ;  POSITION ON THE SCREEN.
  3405                              <1> ; ENTRY --
  3406                              <1> ;  AL = CHARACTER TO WRITE
  3407                              <1> ;  BL = COLOR ATTRIBUTE TO BE USED FOR FOREGROUND COLOR
  3408                              <1> ;	IF BIT 7 IS SET, THE CHAR IS XOR'D INTO THE REGEN BUFFER
  3409                              <1> ;	(0 IS USED FOR THE BACKGROUND COLOR)
  3410                              <1> ;  CX = NUMBER OF CHARS TO WRITE
  3411                              <1> ;  DS = DATA SEGMENT
  3412                              <1> ;  ES = REGEN SEGMENT
  3413                              <1> ; EXIT --
  3414                              <1> ;  NOTHING IS RETURNED
  3415                              <1> ;
  3416                              <1> ; GRAPHICS READ
  3417                              <1> ;  THIS ROUTINE READS THE ASCII CHARACTER AT THE CURRENT CURSOR
  3418                              <1> ;  POSITION ON THE SCREEN BY MATCHING THE DOTS ON THE SCREEN TO THE
  3419                              <1> ;  CHARACTER GENERATOR CODE POINTS
  3420                              <1> ; ENTRY --
  3421                              <1> ;  NONE (0 IS ASSUMED AS THE BACKGROUND COLOR)
  3422                              <1> ; EXIT --
  3423                              <1> ;  AL = CHARACTER READ AT THAT POSITION (0 RETURNED IF NONE FOUND)
  3424                              <1> ;
  3425                              <1> ; FOR BOTH ROUTINES, THE IMAGES USED TO FORM CHARS ARE CONTAINED IN ROM
  3426                              <1> ;  FOR THE 1ST 128 CHARS.  TO ACCESS CHARS IN THE SECOND HALF, THE USER
  3427                              <1> ;  MUST INITIALIZE THE VECTOR AT INTERRUPT 1FH (LOCATION 0007CH) TO
  3428                              <1> ;  POINT TO THE USER SUPPLIED TABLE OF GRAPHIC IMAGES (8X8 BOXES).
  3429                              <1> ;  FAILURE TO DO SO WILL CAUSE IN STRANGE RESULTS
  3430                              <1> ;-----------------------------------------------------
  3431                              <1> 
  3432                              <1> GRAPHICS_WRITE:
  3433 000023D0 25FF000000          <1> 	and 	eax, 0FFh		; ZERO TO HIGH OF CODE POINT
  3434 000023D5 50                  <1> 	PUSH	eAX			; SAVE CODE POINT VALUE
  3435                              <1> 
  3436                              <1> ;-----	DETERMINE POSITION IN REGEN BUFFER TO PUT CODE POINTS
  3437                              <1> 
  3438 000023D6 E84D010000          <1> 	CALL	S26			; FIND LOCATION IN REGEN BUFFER
  3439 000023DB 89C7                <1> 	MOV	eDI, eAX		; REGEN POINTER IN DI
  3440                              <1> 
  3441                              <1> ;-----	DETERMINE REGION TO GET CODE POINTS FROM
  3442                              <1> 
  3443 000023DD 58                  <1> 	POP	eAX			; RECOVER CODE POINT
  3444                              <1> 
  3445 000023DE BE[3C2D0100]        <1> 	MOV	eSI, CRT_CHAR_GEN	; OFFSET OF IMAGES
  3446                              <1> 
  3447                              <1> ;-----	DETERMINE GRAPHICS MODE IN OPERATION
  3448                              <1> 					; DETERMINE_MODE
  3449 000023E3 66C1E003            <1> 	SAL	AX, 3			; MULTIPLY CODE POINT VALUE BY 8
  3450 000023E7 01C6                <1> 	ADD	eSI, eAX		; SI HAS OFFSET OF DESIRED CODES
  3451                              <1> 	
  3452 000023E9 803D[225F0000]06    <1> 	CMP	byte [CRT_MODE], 6
  3453 000023F0 7231                <1> 	JC	short S6		; TEST FOR MEDIUM RESOLUTION MODE
  3454                              <1> 
  3455                              <1> ;-----	HIGH RESOLUTION MODE
  3456                              <1> 
  3457 000023F2 81C700800B00        <1> 	add	edi, 0B8000h
  3458                              <1> S1:					; HIGH_CHAR
  3459 000023F8 57                  <1> 	PUSH	eDI			; SAVE REGEN POINTER
  3460 000023F9 56                  <1> 	PUSH	eSI			; SAVE CODE POINTER
  3461 000023FA B604                <1> 	MOV	DH, 4			; NUMBER OF TIMES THROUGH LOOP
  3462                              <1> S2:
  3463 000023FC AC                  <1> 	LODSB				; GET BYTE FROM CODE POINTS
  3464 000023FD F6C380              <1> 	TEST	BL, 80H			; SHOULD WE USE THE FUNCTION
  3465 00002400 7515                <1> 	JNZ	short S5		; TO PUT CHAR IN
  3466 00002402 AA                  <1> 	STOSB				; STORE IN REGEN BUFFER
  3467 00002403 AC                  <1> 	LODSB
  3468                              <1> S4:
  3469 00002404 8887FF1F0000        <1> 	MOV	[eDI+2000H-1], AL ; STORE IN SECOND HALF
  3470 0000240A 83C74F              <1> 	ADD	eDI, 79			; MOVE TO NEXT ROW IN REGEN
  3471 0000240D FECE                <1> 	DEC	DH			; DONE WITH LOOP
  3472 0000240F 75EB                <1> 	JNZ	short S2
  3473 00002411 5E                  <1> 	POP	eSI
  3474 00002412 5F                  <1> 	POP	eDI			; RECOVER REGEN POINTER
  3475 00002413 47                  <1> 	INC	eDI			; POINT TO NEXT CHAR POSITION
  3476 00002414 E2E2                <1> 	LOOP	S1			; MORE CHARS TO WRITE
  3477 00002416 C3                  <1> 	retn
  3478                              <1> 
  3479                              <1> S5:
  3480 00002417 3207                <1> 	XOR	AL, [eDI]		; EXCLUSIVE OR WITH CURRENT
  3481 00002419 AA                  <1> 	STOSB				; STORE THE CODE POINT
  3482 0000241A AC                  <1> 	LODSB				; AGAIN FOR ODD FIELD
  3483 0000241B 3287FF1F0000        <1> 	XOR	AL, [eDI+2000H-1]
  3484 00002421 EBE1                <1> 	JMP	short S4		; BACK TO MAINSTREAM
  3485                              <1> 
  3486                              <1> ;-----	MEDIUM RESOLUTION WRITE
  3487                              <1> S6:					; MED_RES_WRITE
  3488 00002423 88DA                <1> 	MOV	DL, BL			; SAVE HIGH COLOR BIT
  3489 00002425 66D1E7              <1> 	SAL	DI, 1			; OFFSET*2 SINCE 2 BYTES/CHAR
  3490                              <1> 					; EXPAND BL TO FULL WORD OF COLOR
  3491 00002428 80E303              <1> 	AND	BL, 3			; ISOLATE THE COLOR BITS ( LOW 2 BITS )
  3492 0000242B B055                <1> 	MOV	AL, 055H 		; GET BIT CONVERSION MULTIPLIER
  3493 0000242D F6E3                <1> 	MUL	BL			; EXPAND 2 COLOR BITS TO 4 REPLICATIONS
  3494 0000242F 88C3                <1> 	MOV	BL, AL			; PLACE BACK IN WORK REGISTER
  3495 00002431 88C7                <1> 	MOV	BH, AL			; EXPAND TO 8 REPLICATIONS OF COLOR BITS
  3496 00002433 81C700800B00        <1> 	add	edi, 0B8000h
  3497                              <1> S7:                                     ; MED_CHAR
  3498 00002439 57                  <1> 	PUSH	eDI			; SAVE REGEN POINTER
  3499 0000243A 56                  <1> 	PUSH	eSI			; SAVE THE CODE POINTER
  3500 0000243B B604                <1> 	MOV	DH, 4			; NUMBER OF LOOPS
  3501                              <1> S8:
  3502 0000243D AC                  <1> 	LODSB				; GET CODE POINT
  3503 0000243E E8B3000000          <1> 	CALL	S21			; DOUBLE UP ALL THE BITS
  3504 00002443 6621D8              <1> 	AND	AX, BX			; CONVERT TO FOREGROUND COLOR ( 0 BACK )
  3505 00002446 86E0                <1> 	XCHG	AH, AL			; SWAP HIGH/LOW BYTES FOR WORD MOVE
  3506 00002448 F6C280              <1> 	TEST	DL, 80H			; IS THIS XOR FUNCTION
  3507 0000244B 7403                <1> 	JZ	short S9		; NO, STORE IT IN AS IS
  3508 0000244D 663307              <1> 	XOR	AX, [eDI]		; DO FUNCTION WITH LOW/HIGH
  3509                              <1> S9:
  3510 00002450 668907              <1> 	MOV	[eDI], AX		; STORE FIRST BYTE HIGH, SECOND LOW
  3511 00002453 AC                  <1> 	LODSB				; GET CODE POINT
  3512 00002454 E89D000000          <1> 	CALL	S21
  3513 00002459 6621D8              <1> 	AND	AX, BX			; CONVERT TO COLOR
  3514 0000245C 86E0                <1> 	XCHG	AH, AL			; SWAP HIGH/LOW BYTES FOR WORD MOVE
  3515 0000245E F6C280              <1> 	TEST	DL, 80H			; AGAIN, IS THIS XOR FUNCTION
  3516 00002461 7407                <1> 	JZ	short _S10		; NO, JUST STORE THE VALUES
  3517 00002463 66338700200000      <1> 	XOR	AX, [eDI+2000H]		; FUNCTION WITH FIRST HALF LOW
  3518                              <1> _S10:
  3519 0000246A 66898700200000      <1> 	MOV	[eDI+2000H], AX		; STORE SECOND PORTION HIGH
  3520 00002471 6683C750            <1> 	ADD	DI, 80			; POINT TO NEXT LOCATION
  3521 00002475 FECE                <1> 	DEC	DH
  3522 00002477 75C4                <1> 	JNZ	short S8		; KEEP GOING
  3523 00002479 5E                  <1> 	POP	eSI			; RECOVER CODE POINTER
  3524 0000247A 5F                  <1> 	POP	eDI			; RECOVER REGEN POINTER
  3525 0000247B 47                  <1> 	INC	eDI			; POINT TO NEXT CHAR POSITION
  3526 0000247C 47                  <1> 	INC	eDI
  3527 0000247D E2BA                <1> 	LOOP	S7			; MORE TO WRITE
  3528 0000247F C3                  <1> 	retn
  3529                              <1> 
  3530                              <1> ; 04/07/2016
  3531                              <1> ; 01/07/2016
  3532                              <1> ; 30/06/2016 - TRDOS 386 (TRDOS v2.0)
  3533                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3534                              <1> ;----------------------------------------
  3535                              <1> ; GRAPHICS READ
  3536                              <1> ;----------------------------------------
  3537                              <1> GRAPHICS_READ:
  3538 00002480 E8A3000000          <1> 	CALL	S26			; CONVERTED TO OFFSET IN REGEN
  3539 00002485 89C6                <1> 	MOV	eSI, eAX		; SAVE IN SI
  3540 00002487 81C600800B00        <1> 	add	esi, 0B8000h		; 01/07/2016
  3541 0000248D 83EC08              <1> 	SUB	eSP, 8			; ALLOCATE SPACE FOR THE READ CODE POINT
  3542 00002490 89E5                <1> 	MOV	eBP, eSP		; POINTER TO SAVE AREA
  3543                              <1> 
  3544                              <1> ;-----	DETERMINE GRAPHICS MODES
  3545 00002492 B604                <1> 	mov	dh, 4			; number of passes ; 01/07/2016
  3546 00002494 803D[225F0000]06    <1> 	CMP	byte [CRT_MODE], 6
  3547 0000249B 7219                <1> 	JC	short S12		; MEDIUM RESOLUTION
  3548                              <1> 
  3549                              <1> ;-----	HIGH RESOLUTION READ
  3550                              <1> ;-----	GET VALUES FROM REGEN BUFFER AND CONVERT TO CODE POINT
  3551                              <1> 	;MOV	DH,4			; NUMBER OF PASSES
  3552                              <1> S11:
  3553 0000249D 8A06                <1> 	MOV	AL, [eSI] 		; GET FIRST BYTE
  3554 0000249F 884500              <1> 	MOV	[eBP], AL 		; SAVE IN STORAGE AREA
  3555 000024A2 45                  <1> 	INC	eBP			; NEXT LOCATION
  3556 000024A3 8A8600200000        <1> 	MOV	AL, [eSI+2000H]		; GET LOWER REGION BYTE
  3557 000024A9 884500              <1> 	MOV	[eBP], AL 		; ADJUST AND STORE
  3558 000024AC 45                  <1> 	INC	eBP
  3559 000024AD 83C650              <1> 	ADD	eSI, 80			; POINTER INTO REGEN
  3560 000024B0 FECE                <1> 	DEC	DH			; LOOP CONTROL
  3561 000024B2 75E9                <1> 	JNZ	short S11		; DO IT SOME MORE
  3562 000024B4 EB1D                <1> 	JMP	SHORT S14		; GO MATCH THE SAVED CODE POINTS
  3563                              <1> 
  3564                              <1> ;-----	MEDIUM RESOLUTION READ
  3565                              <1> S12:	
  3566 000024B6 66D1E6              <1> 	SAL	SI, 1			; OFFSET*2 SINCE 2 BYTES/CHAR
  3567                              <1> 	;MOV	DH, 4			; NUMBER OF PASSES
  3568                              <1> S13:
  3569 000024B9 E84D000000          <1> 	CALL	S23			; GET BYTES FROM REGEN INTO SINGLE SAVE
  3570 000024BE 81C6FE1F0000        <1> 	ADD	eSI, 2000H-2		; GO TO LOWER REGION
  3571 000024C4 E842000000          <1> 	CALL	S23			; GET THIS PAIR INTO SAVE
  3572 000024C9 81EEB21F0000        <1> 	SUB	eSI, 2000H-80+2		; ADJUST POINTER BACK INTO UPPER
  3573 000024CF FECE                <1> 	DEC	DH
  3574 000024D1 75E6                <1> 	JNZ	short S13		; KEEP GOING UNTIL ALL 8 DONE
  3575                              <1> 
  3576                              <1> ;-----	SAVE AREA HAS CHARACTER IN IT, MATCH IT
  3577                              <1> S14:					; FIND_CHAR
  3578 000024D3 BF[3C2D0100]        <1> 	MOV	eDI, CRT_CHAR_GEN	; ESTABLISH ADDRESSING
  3579 000024D8 83ED08              <1> 	SUB	eBP, 8			; ADJUST POINTER TO START OF SAVE AREA
  3580 000024DB 89EE                <1> 	MOV	eSI, eBP
  3581                              <1> S15:
  3582 000024DD 66B80001            <1> 	mov	ax, 256			; NUMBER TO TEST AGAINST
  3583                              <1> S16:
  3584 000024E1 56                  <1> 	PUSH	eSI			; SAVE SAVE AREA POINTER
  3585 000024E2 57                  <1> 	PUSH	eDI			; SAVE CODE POINTER
  3586                              <1> 	;MOV	eCX, 4			; NUMBER OF WORDS TO MATCH
  3587                              <1> 	;REPE	CMPSW			; COMPARE THE 8 BYTES AS WORDS
  3588 000024E3 A7                  <1> 	cmpsd				; compare first 4 bytes 
  3589 000024E4 7501                <1> 	jne	short S17		; 
  3590 000024E6 A7                  <1> 	cmpsd				; compare last 4 bytes
  3591                              <1> S17:
  3592 000024E7 5F                  <1> 	POP	eDI			; RECOVER THE POINTERS
  3593 000024E8 5E                  <1> 	POP	eSI
  3594                              <1> 	;JZ	short S18		; IF ZERO FLAG SET, THEN MATCH OCCURRED
  3595 000024E9 7407                <1> 	je	short S18
  3596                              <1> 	;				; NO MATCH, MOVE ON TO NEXT
  3597 000024EB 83C708              <1> 	ADD	eDI, 8			; NEXT CODE POINT
  3598 000024EE 6648                <1> 	dec	ax			; LOOP CONTROL
  3599 000024F0 75EF                <1> 	JNZ	short S16		; DO ALL OF THEM
  3600                              <1> 
  3601                              <1> ;-----	CHARACTER IS FOUND ( AL=0 IF NOT FOUND )
  3602                              <1> S18:	
  3603 000024F2 83C408              <1> 	ADD	eSP, 8			; READJUST THE STACK, THROW AWAY SAVE
  3604 000024F5 C3                  <1> 	retn				; ALL DONE
  3605                              <1> 
  3606                              <1> ; 30/06/2016 - TRDOS 386 (TRDOS v2.0)
  3607                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3608                              <1> ;--------------------------------------------
  3609                              <1> ; EXPAND BYTE
  3610                              <1> ;  THIS ROUTINE TAKES THE BYTE IN AL AND DOUBLES ALL
  3611                              <1> ;  OF THE BITS, TURNING THE 8 BITS INTO 16 BITS.
  3612                              <1> ;  THE RESULT IS LEFT IN AX
  3613                              <1> ;--------------------------------------------
  3614                              <1> S21:
  3615 000024F6 6651                <1> 	PUSH	CX			; SAVE REGISTER
  3616                              <1> 	;MOV	CX, 8			; SHIFT COUNT REGISTER FOR ONE BYTE
  3617 000024F8 B108                <1> 	mov	cl, 8
  3618                              <1> S22:
  3619 000024FA D0C8                <1> 	ROR	AL,1			; SHIFT BITS, LOW BIT INTO CARRY FLAG
  3620 000024FC 66D1DD              <1> 	RCR	BP,1			; MOVE CARRY FLAG (LOW BIT INTO RESULTS
  3621 000024FF 66D1FD              <1> 	SAR	BP,1			; SIGN EXTEND HIGH BIT (DOUBLE IT)
  3622                              <1> 	;LOOP	S22			; REPEAT FOR ALL 8 BITS
  3623 00002502 FEC9                <1> 	dec	cl
  3624 00002504 75F4                <1> 	jnz	short S22
  3625 00002506 6695                <1> 	XCHG	AX, BP			; MOVE RESULTS TO PARAMETER REGISTER
  3626 00002508 6659                <1> 	POP	CX			; RECOVER REGISTER
  3627 0000250A C3                  <1> 	RETn				; ALL DONE
  3628                              <1> 
  3629                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  3630                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3631                              <1> ;--------------------------------------------------
  3632                              <1> ; MED_READ_BYTE
  3633                              <1> ; THIS ROUTINE WILL TAKE 2 BYTES FROM THE REGEN BUFFER,
  3634                              <1> ;  COMPARE AGAINST THE CURRENT FOREGROUND COLOR, AND PLACE
  3635                              <1> ;  THE CORRESPONDING ON/OFF BIT PATTERN INTO THE CURRENT
  3636                              <1> ;  POSITION IN THE SAVE AREA
  3637                              <1> ; ENTRY --
  3638                              <1> ;  SI,DS = POINTER TO REGEN AREA OF INTEREST
  3639                              <1> ;  BX = EXPANDED FOREGROUND COLOR
  3640                              <1> ;  BP = POINTER TO SAVE AREA
  3641                              <1> ; EXIT --
  3642                              <1> ;  SI AND BP ARE INCREMENTED
  3643                              <1> ;----------------------------------------------------
  3644                              <1> S23:
  3645 0000250B 66AD                <1> 	LODSW				; GET FIRST BYTE AND SECOND BYTES
  3646 0000250D 86C4                <1> 	XCHG	AL, AH			; SWAP FOR COMPARE
  3647 0000250F 66B900C0            <1> 	MOV	CX, 0C000H		; 2 BIT MASK TO TEST THE ENTRIES
  3648 00002513 B200                <1> 	MOV	DL, 0			; RESULT REGISTER
  3649                              <1> S24:
  3650 00002515 6685C8              <1> 	TEST	AX, CX			; IS THIS SECTION BACKCROUND?
  3651 00002518 7401                <1>         JZ      short S25               ; IF ZERO, IT IS BACKGROUND (CARRY=0)
  3652 0000251A F9                  <1> 	STC				; WASN'T, SO SET CARRY
  3653                              <1> S25:
  3654 0000251B D0D2                <1> 	RCL	DL, 1			; MOVE THAT BIT INTO THE RESULT
  3655 0000251D 66C1E902            <1> 	SHR	CX, 2			; MOVE THE MASK TO THE RIGHT BY 2 BITS
  3656 00002521 73F2                <1> 	JNC	short S24		; DO IT AGAIN IF MASK DIDN'T FALL OUT
  3657 00002523 885500              <1> 	MOV	[eBP], DL 		; STORE RESULT IN SAVE AREA
  3658 00002526 45                  <1> 	INC	eBP			; ADJUST POINTER
  3659 00002527 C3                  <1> 	RETn				; ALL DONE
  3660                              <1> 
  3661                              <1> ; 30/06/2016 - TRDOS 386 (TRDOS v2.0)
  3662                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3663                              <1> ;-----------------------------------------
  3664                              <1> ; V4_POSITION
  3665                              <1> ;  THIS ROUTINE TAKES THE CURSOR POSITION CONTAINED IN
  3666                              <1> ;  THE MEMORY LOCATION, AND CONVERTS IT INTO AN OFFSET
  3667                              <1> ;  INTO THE REGEN BUFFER, ASSUMING ONE BYTE/CHAR.
  3668                              <1> ;  FOR MEDIUM RESOLUTION GRAPHICS, THE NUMBER MUST
  3669                              <1> ;  BE DOUBLED.
  3670                              <1> ; ENTRY -- NO REGISTERS,MEMORY LOCATION @CURSOR_POSN IS USED
  3671                              <1> ; EXIT--
  3672                              <1> ;  AX CONTAINS OFFSET INTO REGEN BUFFER
  3673                              <1> ;-----------------------------------------
  3674                              <1> S26:
  3675 00002528 0FB705[DE580100]    <1> 	movzx	eax, word [CURSOR_POSN]	; GET CURRENT CURSOR
  3676                              <1> GRAPH_POSN:
  3677 0000252F 53                  <1> 	PUSH	eBX			; SAVE REGISTER
  3678 00002530 0FB6D8              <1> 	movzx	ebx, al			; SAVE A COPY OF CURRENT CURSOR
  3679 00002533 A0[245F0000]        <1> 	MOV	AL, [CRT_COLS]		; GET BYTES PER COLUMN
  3680 00002538 F6E4                <1> 	MUL	AH			; MULTIPLY BY ROWS
  3681 0000253A 66C1E002            <1> 	SHL	AX, 2			; MULTIPLY * 4 SINCE 4 ROWS/BYTE
  3682 0000253E 01D8                <1> 	ADD	eAX, eBX		; DETERMINE OFFSET
  3683 00002540 5B                  <1> 	POP	eBX			; RECOVER POINTER
  3684 00002541 C3                  <1> 	RETn				; ALL DONE
  3685                              <1> 
  3686                              <1> ; 09/07/2016
  3687                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  3688                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3689                              <1> ;---------------------------------------------
  3690                              <1> ; SET_COLOR
  3691                              <1> ;	THIS ROUTINE WILL ESTABLISH THE BACKGROUND COLOR, THE OVERSCAN COLOR,
  3692                              <1> ;	AND THE FOREGROUND COLOR SET FOR MEDIUM RESOLUTION GRAPHICS
  3693                              <1> ; INPUT
  3694                              <1> ;	(BH) HAS COLOR ID
  3695                              <1> ;		IF BH=0, THE BACKGROUND COLOR VALUE IS SET
  3696                              <1> ;			FROM THE LOW BITS OF BL (0-31)
  3697                              <1> ;		IF BH=1, THE PALETTE SELECTION IS MADE
  3698                              <1> ;			BASED ON THE LOW BIT OF BL:
  3699                              <1> ;				0 = GREEN, RED, YELLOW FOR COLORS 1,2,3
  3700                              <1> ;				1 = BLUE, CYAN, MAGENTA FOR COLORS 1,2,3
  3701                              <1> ;	(BL) HAS THE COLOR VALUE TO BE USED
  3702                              <1> ; OUTPUT
  3703                              <1> ;	THE COLOR SELECTION IS UPDATED
  3704                              <1> ;----------------------------------------------
  3705                              <1> SET_COLOR:
  3706 00002542 803D[225F0000]07    <1>         cmp     byte [CRT_MODE], 7      ; 09/07/2016
  3707 00002549 0F870EF0FFFF        <1> 	ja	VIDEO_RETURN		; nothing to do for VGA modes	 
  3708                              <1> 
  3709                              <1> 	;MOV	DX, [ADDR_6845]		; I/O PORT FOR PALETTE
  3710                              <1> 	;mov	dx, 3D4h
  3711                              <1> 	;ADD	DX,5			; OVERSCAN PORT
  3712 0000254F 66BAD903            <1> 	mov	dx, 3D9h
  3713 00002553 A0[255F0000]        <1> 	MOV	AL, [CRT_PALETTE] 	; GET THE CURRENT PALETTE VALUE
  3714 00002558 08FF                <1> 	OR	BH, BH			; IS THIS COLOR 0?
  3715 0000255A 7512                <1> 	JNZ	short M20		; OUTPUT COLOR 1
  3716                              <1> 
  3717                              <1> ;-----	HANDLE COLOR 0 BY SETTING THE BACKGROUND COLOR
  3718                              <1> 
  3719 0000255C 24E0                <1> 	AND	AL, 0E0H 		; TURN OFF LOW 5 BITS OF CURRENT
  3720 0000255E 80E31F              <1> 	AND	BL, 01FH 		; TURN OFF HIGH 3 BITS OF INPUT VALUE
  3721 00002561 08D8                <1> 	OR	AL, BL			; PUT VALUE INTO REGISTER
  3722                              <1> M19:					; OUTPUT THE PALETTE
  3723 00002563 EE                  <1> 	OUT	DX, AL			; OUTPUT COLOR SELECTION TO 3D9 PORT
  3724 00002564 A2[255F0000]        <1> 	MOV	[CRT_PALETTE], AL 	; SAVE THE COLOR VALUE
  3725 00002569 E9EFEFFFFF          <1> 	JMP	VIDEO_RETURN
  3726                              <1> 
  3727                              <1> ;-----	HANDLE COLOR 1 BY SELECTING THE PALETTE TO BE USED
  3728                              <1> 
  3729                              <1> M20:
  3730 0000256E 24DF                <1> 	AND	AL, 0DFH 		; TURN OFF PALETTE SELECT BIT
  3731 00002570 D0EB                <1> 	SHR	BL, 1			; TEST THE LOW ORDER BIT OF BL
  3732 00002572 73EF                <1> 	JNC	short M19		; ALREADY DONE
  3733 00002574 0C20                <1> 	OR	AL, 20H			; TURN ON PALETTE SELECT BIT
  3734 00002576 EBEB                <1> 	JMP	short M19		; GO DO IT
  3735                              <1> 
  3736                              <1> ; 09/07/2016
  3737                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  3738                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3739                              <1> ;--------------------------------------------
  3740                              <1> ; READ DOT -- WRITE DOT
  3741                              <1> ; THESE ROUTINES WILL WRITE A DOT, OR READ THE
  3742                              <1> ;  DOT AT THE INDICATED LOCATION
  3743                              <1> ; ENTRY --
  3744                              <1> ;   DX = ROW (0-199)	(THE ACTUAL VALUE DEPENDS ON THE MODE)
  3745                              <1> ;   CX = COLUMN ( 0-639) ( THE VALUES ARE NOT RANGE CHECKED )
  3746                              <1> ;   AL = DOT VALUE TO WRITE (1,2 OR 4 BITS DEPENDING ON MODE,
  3747                              <1> ;	REQUIRED FOR WRITE DOT ONLY, RIGHT JUSTIFIED)
  3748                              <1> ;	BIT 7 OF AL = 1 INDICATES XOR THE VALUE INTO THE LOCATION
  3749                              <1> ;   DS = DATA SEGMENT
  3750                              <1> ;   ES = REGEN SEGMENT
  3751                              <1> ;
  3752                              <1> ; EXIT
  3753                              <1> ;	AL = DOT VALUE READ, RIGHT JUSTIFIED, READ ONLY
  3754                              <1> ;----------------------------------------------
  3755                              <1> 
  3756                              <1> READ_DOT:
  3757                              <1> 	; 09/07/2016
  3758 00002578 8A25[225F0000]      <1> 	mov	ah,  [CRT_MODE]
  3759 0000257E 80FC07              <1> 	cmp	ah, 7 ; 6!?
  3760 00002581 760A                <1> 	jna	short read_dot_cga
  3761                              <1> 
  3762 00002583 E8CB030000          <1> 	call	vga_read_pixel
  3763                              <1> 	; al = pixel value
  3764 00002588 E9D5EFFFFF          <1> 	jmp	_video_return
  3765                              <1> 
  3766                              <1> read_dot_cga:
  3767                              <1> 	;je	VIDEO_RETURN ; 7	
  3768 0000258D 80FC04              <1> 	cmp	ah, 4 ; graphics ? 
  3769 00002590 0F82C7EFFFFF        <1> 	jb	VIDEO_RETURN ; no, text mode, nothing to do
  3770                              <1> 
  3771 00002596 E855000000          <1> 	CALL	R3			; DETERMINE BYTE POSITION OF DOT
  3772 0000259B 8A06                <1> 	MOV	AL, [eSI]		; GET THE BYTE
  3773 0000259D 20E0                <1> 	AND	AL, AH			; MASK OFF THE OTHER BITS IN THE BYTE
  3774 0000259F D2E0                <1> 	SHL	AL, CL			; LEFT JUSTIFY THE VALUE
  3775 000025A1 88F1                <1> 	MOV	CL, DH			; GET NUMBER OF BITS IN RESULT
  3776 000025A3 D2C0                <1> 	ROL	AL, CL			; RIGHT JUSTIFY THE RESULT
  3777                              <1> 	;JMP	VIDEO_RETURN		; RETURN FROM VIDEO I/O
  3778 000025A5 0FB6C0              <1> 	movzx	eax, al
  3779 000025A8 E9B5EFFFFF          <1> 	jmp	_video_return
  3780                              <1> 
  3781                              <1> ; 09/07/2016
  3782                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  3783                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3784                              <1> 
  3785                              <1> WRITE_DOT:
  3786                              <1> 	; 09/07/2016
  3787 000025AD 8A25[225F0000]      <1> 	mov	ah, [CRT_MODE]
  3788 000025B3 80FC07              <1> 	cmp	ah, 7 ; 6!?
  3789 000025B6 760A                <1> 	jna	short write_dot_cga
  3790                              <1> 	
  3791 000025B8 E805030000          <1> 	call	vga_write_pixel
  3792 000025BD E99BEFFFFF          <1> 	jmp	VIDEO_RETURN
  3793                              <1> 
  3794                              <1> write_dot_cga:
  3795                              <1> 	;je	VIDEO_RETURN ; 7	
  3796 000025C2 80FC04              <1> 	cmp	ah, 4 ; graphics ? 
  3797 000025C5 0F8292EFFFFF        <1> 	jb	VIDEO_RETURN ; no, text mode, nothing to do
  3798                              <1> 
  3799                              <1> 	;PUSH	AX			; SAVE DOT VALUE
  3800 000025CB 6650                <1> 	PUSH	AX			; TWICE
  3801 000025CD E81E000000          <1> 	CALL	R3			; DETERMINE BYTE POSITION OF THE DOT
  3802 000025D2 D2E8                <1> 	SHR	AL, CL			; SHIFT TO SET UP THE BITS FOR OUTPUT
  3803 000025D4 20E0                <1> 	AND	AL, AH			; STRIP OFF THE OTHER BITS
  3804 000025D6 8A0E                <1> 	MOV	CL, [eSI]		; GET THE CURRENT BYTE
  3805 000025D8 665B                <1> 	POP	BX			; RECOVER XOR FLAG
  3806 000025DA F6C380              <1> 	TEST	BL, 80H			; IS IT ON
  3807 000025DD 750D                <1> 	JNZ	short R2		; YES, XOR THE DOT
  3808 000025DF F6D4                <1> 	NOT	AH			; SET MASK TO REMOVE THE INDICATED BITS
  3809 000025E1 20E1                <1> 	AND	CL, AH
  3810 000025E3 08C8                <1> 	OR	AL, CL			; OR IN THE NEW VALUE OF THOSE BITS
  3811                              <1> R1:					; FINISH_DOT
  3812 000025E5 8806                <1> 	MOV	[eSI], AL		; RESTORE THE BYTE IN MEMORY
  3813                              <1> 	;POP	AX
  3814 000025E7 E971EFFFFF          <1> 	JMP	VIDEO_RETURN		; RETURN FROM VIDEO I/O
  3815                              <1> R2:					; XOR_DOT
  3816 000025EC 30C8                <1> 	XOR	AL, CL			; EXCLUSIVE OR THE DOTS
  3817 000025EE EBF5                <1> 	JMP	short R1		; FINISH UP THE WRITING
  3818                              <1> 
  3819                              <1> ; 01/07/2016 - TRDOS 386 (TRDOS v2.0)
  3820                              <1> ; VIDEO1.ASM - 24/03/1985 (IBM PC-AT BIOS source code)
  3821                              <1> 
  3822                              <1> ;----------------------------------------------
  3823                              <1> ; THIS SUBROUTINE DETERMINES THE REGEN BYTE LOCATION OF THE
  3824                              <1> ; INDICATED ROW COLUMN VALUE IN GRAPHICS MODE.
  3825                              <1> ; ENTRY --
  3826                              <1> ;  DX = ROW VALUE (0-199)
  3827                              <1> ;  CX = COLUMN VALUE (0-639)
  3828                              <1> ; EXIT --
  3829                              <1> ;  SI = OFFSET INTO REGEN BUFFER FOR BYTE OF INTEREST
  3830                              <1> ;  AH = MASK TO STRIP OFF THE BITS OF INTEREST
  3831                              <1> ;  CL = BITS TO SHIFT TO RIGHT JUSTIFY THE MASK IN AH
  3832                              <1> ;  DH = # BITS IN RESULT
  3833                              <1> ;  BX = MODIFIED
  3834                              <1> ;-----------------------------------------------
  3835                              <1> R3:
  3836                              <1> 
  3837                              <1> ;-----	DETERMINE 1ST BYTE IN INDICATED ROW BY MULTIPLYING ROW VALUE BY 40
  3838                              <1> ;-----	 ( LOW BIT OF ROW DETERMINES EVEN/ODD, 80 BYTES/ROW )
  3839                              <1> 
  3840 000025F0 0FB7F0              <1> 	movzx	esi, ax			; WILL SAVE AL AND AH DURING OPERATION
  3841 000025F3 B028                <1> 	MOV	AL, 40
  3842 000025F5 F6E2                <1> 	MUL	DL			; AX= ADDRESS OF START OF INDICATED ROW
  3843 000025F7 A808                <1> 	TEST	AL, 08H 		; TEST FOR EVEN/ODD ROW CALCULATED
  3844 000025F9 7404                <1> 	JZ	short R4		; JUMP IF EVEN ROW
  3845 000025FB 6605D81F            <1> 	ADD	AX, 2000H-40		; OFFSET TO LOCATION OF ODD ROWS ADJUST
  3846                              <1> R4:					; EVEN_ROW
  3847 000025FF 6696                <1> 	XCHG	SI, AX			; MOVE POINTER TO (SI) AND RECOVER (AX)
  3848 00002601 81C600800B00        <1> 	add	esi, 0B8000h
  3849 00002607 6689CA              <1> 	MOV	DX, CX			; COLUMN VALUE TO DX
  3850                              <1> 
  3851                              <1> ;-----	DETERMINE GRAPHICS MODE CURRENTLY IN EFFECT
  3852                              <1> 
  3853                              <1> ; SET UP THE REGISTERS ACCORDING TO THE MODE
  3854                              <1> ; CH = MASK FOR LOW OF COLUMN ADDRESS ( 7/3 FOR HIGH/MED RES )
  3855                              <1> ; CL = # OF ADDRESS BITS IN COLUMN VALUE ( 3/2 FOR H/M )
  3856                              <1> ; BL = MASK TO SELECT BITS FROM POINTED BYTE ( 80H/C0H FOR H/M )
  3857                              <1> ; BH = NUMBER OF VALID BITS IN POINTED BYTE ( 1/2 FOR H/M )
  3858                              <1> 
  3859 0000260A 66BBC002            <1> 	MOV	BX, 2C0H
  3860 0000260E 66B90203            <1> 	MOV	CX, 302H 		; SET PARMS FOR MED RES
  3861 00002612 803D[225F0000]06    <1> 	CMP	byte [CRT_MODE], 6
  3862 00002619 7208                <1> 	JC	short R5		; HANDLE IF MED RES
  3863 0000261B 66BB8001            <1> 	MOV	BX, 180H
  3864 0000261F 66B90307            <1> 	MOV	CX, 703H 		; SET PARMS FOR HIGH RES
  3865                              <1> 
  3866                              <1> ;-----	DETERMINE BIT OFFSET IN BYTE FROM COLUMN MASK
  3867                              <1> R5:
  3868 00002623 20D5                <1> 	AND	CH, DL			; ADDRESS OF PEL WITHIN BYTE TO CH
  3869                              <1> 
  3870                              <1> ;-----	DETERMINE BYTE OFFSET FOR THIS LOCATION IN COLUMN
  3871                              <1> 
  3872 00002625 66D3EA              <1> 	SHR	DX, CL			; SHIFT BY CORRECT AMOUNT
  3873 00002628 6601D6              <1> 	ADD	SI, DX			; INCREMENT THE POINTER
  3874 0000262B 88FE                <1> 	MOV	DH, BH			; GET THE # OF BITS IN RESULT TO DH
  3875                              <1> 
  3876                              <1> ;-----	MULTIPLY BH (VALID BITS IN BYTE) BY CH (BIT OFFSET)
  3877                              <1> 
  3878 0000262D 28C9                <1> 	SUB	CL, CL			; ZERO INTO STORAGE LOCATION
  3879                              <1> R6:
  3880 0000262F D0C8                <1> 	ROR	AL, 1			; LEFT JUSTIFY VALUE IN AL (FOR WRITE)
  3881 00002631 00E9                <1> 	ADD	CL, CH			; ADD IN THE BIT OFFSET VALUE
  3882 00002633 FECF                <1> 	DEC	BH			; LOOP CONTROL
  3883 00002635 75F8                <1> 	JNZ	short R6		; ON EXIT, CL HAS COUNT TO RESTORE BITS
  3884 00002637 88DC                <1> 	MOV	AH, BL			;  GET MASK TO AH
  3885 00002639 D2EC                <1> 	SHR	AH, CL			;  MOVE THE MASK TO CORRECT LOCATION
  3886 0000263B C3                  <1> 	RETn				;  RETURN WITH EVERYTHING SET UP
  3887                              <1> 
  3888                              <1> load_dac_palette:
  3889                              <1> 	; 29/07/2016
  3890                              <1> 	; 23/07/2016
  3891                              <1> 	; 03/07/2016 (TRDOS 386 = TRDOS v2.0)
  3892                              <1> 	; (set_mode_vga)
  3893                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  3894                              <1> 	; vgabios-0.7a (2011)
  3895                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  3896                              <1> 	; 'vgabios.c', 'load_dac_palette'
  3897                              <1> 	;
  3898                              <1> 	; Oracle VirtualBox 5.0.24 VGABios Source Code
  3899                              <1> 	; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
  3900                              <1> 	;
  3901                              <1> 	; INPUT -> AH = DAC selection number (3, 2 or 1)
  3902                              <1> 	; OUTPUT -> ECX = 0, AX = 0
  3903                              <1> 	; (Modifed registers: EAX, ECX, EDX, ESI)
  3904                              <1> 	;
  3905 0000263C 66BAC803            <1> 	mov	dx, 3C8h  ; VGAREG_DAC_WRITE_ADDRESS
  3906 00002640 28C0                <1> 	sub	al, al ; 0
  3907 00002642 EE                  <1> 	out	dx, al ; 0 ; color index, always 0 at the beginning	
  3908 00002643 6642                <1> 	inc	dx   ; 3C9h ; VGAREG_DAC_DATA
  3909 00002645 B900010000          <1> 	mov	ecx, 256   ; always 256*3 values
  3910                              <1> 	;push	esi
  3911 0000264A 88E0                <1> 	mov	al, ah
  3912 0000264C B43F                <1> 	mov	ah, 3Fh	; 3Fh except DAC selection number 3
  3913 0000264E 3C02                <1> 	cmp 	al, 2
  3914 00002650 7414                <1> 	je	short l_dac_p_2
  3915 00002652 7719                <1> 	ja	short l_dac_p_3
  3916 00002654 20C0                <1> 	and	al, al
  3917 00002656 7507                <1> 	jnz	short l_dac_p_1
  3918                              <1> l_dac_p_0:
  3919 00002658 BE[FC270100]        <1> 	mov	esi, palette0
  3920 0000265D EB15                <1> 	jmp	short l_dac_p_4	
  3921                              <1> l_dac_p_1:
  3922 0000265F BE[BC280100]        <1> 	mov	esi, palette1
  3923 00002664 EB0E                <1> 	jmp	short l_dac_p_4
  3924                              <1> l_dac_p_2:
  3925 00002666 BE[7C290100]        <1> 	mov	esi, palette2
  3926 0000266B EB07                <1> 	jmp	short l_dac_p_4
  3927                              <1> l_dac_p_3:
  3928 0000266D B4FF                <1> 	mov	ah, 0FFh ; dac registers
  3929 0000266F BE[3C2A0100]        <1> 	mov	esi, palette3
  3930                              <1> l_dac_p_4:
  3931 00002674 AC                  <1> 	lodsb
  3932 00002675 EE                  <1> 	out	dx, al  ; Red
  3933 00002676 AC                  <1> 	lodsb
  3934 00002677 EE                  <1> 	out	dx, al	; Green
  3935 00002678 AC                  <1> 	lodsb
  3936 00002679 EE                  <1> 	out	dx, al	; Blue
  3937 0000267A 20E4                <1> 	and	ah, ah
  3938 0000267C 7405                <1> 	jz	short l_dac_p_5	
  3939 0000267E FECC                <1> 	dec	ah
  3940 00002680 E2F2                <1> 	loop	l_dac_p_4
  3941                              <1> 	;pop	esi
  3942 00002682 C3                  <1> 	retn
  3943                              <1> l_dac_p_5:
  3944                              <1> 	; 29/07/2016
  3945 00002683 FEC9                <1> 	dec	cl
  3946 00002685 7407                <1> 	jz	short l_dac_p_7
  3947                              <1> 	;
  3948 00002687 28C0                <1> 	sub	al, al ; 0
  3949                              <1> l_dac_p_6:
  3950 00002689 EE                  <1> 	out	dx, al ; outb(VGAREG_DAC_DATA,0);
  3951 0000268A EE                  <1> 	out	dx, al
  3952 0000268B EE                  <1> 	out	dx, al
  3953 0000268C E2FB                <1> 	loop	l_dac_p_6
  3954                              <1> l_dac_p_7:
  3955                              <1> 	;pop	esi
  3956 0000268E C3                  <1> 	retn
  3957                              <1> 
  3958                              <1> gray_scale_summing:
  3959                              <1> 	; 03/07/2016 (TRDOS 386 = TRDOS v2.0)
  3960                              <1> 	; (set_mode_vga)
  3961                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  3962                              <1> 	; vgabios-0.7a (2011)
  3963                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  3964                              <1> 	; 'vgabios.c', 'biosfn_perform_gray_scale_summing'
  3965                              <1> 	;
  3966                              <1> 	; Oracle VirtualBox 5.0.24 VGABios Source Code
  3967                              <1> 	; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
  3968                              <1> 	;
  3969                              <1> 
  3970                              <1> 	; INPUT -> EBX = Start address (color index <= 255)
  3971                              <1> 	;	   ECX = Count (<= 256)
  3972                              <1> 	; OUTPUT -> (E)CX = 0
  3973                              <1> 	; (Modifed registers: EAX, ECX, EDX, EBX)
  3974                              <1> 
  3975 0000268F 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  3976 00002693 EC                  <1> 	in	al, dx
  3977 00002694 30C0                <1> 	xor	al, al ; 0
  3978 00002696 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  3979 0000269A EE                  <1> 	out	dx, al	; clear bit 5
  3980                              <1> 			; (while loading palette registers)
  3981                              <1> 	; set read address and switch to read mode
  3982                              <1> g_s_s_1:
  3983 0000269B 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  3984 0000269F 88D8                <1> 	mov	al, bl
  3985 000026A1 EE                  <1> 	out	dx, al
  3986                              <1> 	; get 6-bit wide RGB data values
  3987                              <1>  	; intensity = (0.3*Red)+(0.59*Green)+(0.11*Blue)
  3988                              <1> 	; i = ( ( 77*r + 151*g + 28*b ) + 0x80 ) >> 8;
  3989 000026A2 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  3990 000026A6 EC                  <1> 	in	al, dx ; red
  3991 000026A7 B44D                <1> 	mov	ah, 77 ; 0.3* Red
  3992 000026A9 F6E4                <1> 	mul	ah
  3993 000026AB 6650                <1> 	push	ax
  3994 000026AD EC                  <1> 	in	al, dx ; green
  3995 000026AE B497                <1> 	mov	ah, 151  ; 0.59 * Green
  3996 000026B0 F6E4                <1> 	mul	ah
  3997 000026B2 6650                <1> 	push	ax
  3998 000026B4 EC                  <1> 	in	al, dx ; blue
  3999 000026B5 B41C                <1> 	mov	ah, 28 ; 0.11 * Blue
  4000 000026B7 F6E4                <1> 	mul	ah
  4001 000026B9 665A                <1> 	pop	dx
  4002 000026BB 6601D0              <1> 	add	ax, dx
  4003 000026BE 665A                <1> 	pop	dx
  4004 000026C0 6601D0              <1> 	add	ax, dx
  4005 000026C3 66058000            <1> 	add	ax, 80h  
  4006 000026C7 B03F                <1> 	mov	al, 3Fh
  4007 000026C9 38C4                <1> 	cmp	ah, al
  4008 000026CB 7602                <1> 	jna	short g_s_s_2
  4009 000026CD 88C4                <1> 	mov	ah, al
  4010                              <1> g_s_s_2:
  4011 000026CF 66BAC803            <1> 	mov	dx, 3C8h  ; VGAREG_DAC_WRITE_ADDRESS
  4012 000026D3 88D8                <1> 	mov	al, bl ; color index
  4013 000026D5 EE                  <1> 	out	dx, al
  4014 000026D6 88E0                <1> 	mov	al, ah ; intensity
  4015 000026D8 6642                <1> 	inc	dx ; 3C9h ; VGAREG_DAC_DATA
  4016 000026DA EE                  <1> 	out	dx, al ; R (R=G=B)
  4017 000026DB 88E0                <1> 	mov	al, ah ; intensity
  4018 000026DD EE                  <1> 	out	dx, al ; G (R=G=B)
  4019 000026DE 88E0                <1>  	mov	al, ah ; intensity
  4020 000026E0 EE                  <1> 	out	dx, al ; B (R=G=B)
  4021 000026E1 6649                <1> 	dec	cx
  4022 000026E3 7404                <1> 	jz	short g_s_s_3
  4023 000026E5 FEC3                <1> 	inc	bl    ; next color index value
  4024 000026E7 EBB2                <1> 	jmp	short g_s_s_1
  4025                              <1> g_s_s_3:
  4026 000026E9 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  4027 000026ED EC                  <1> 	in	al, dx
  4028 000026EE B020                <1> 	mov	al, 20h
  4029 000026F0 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  4030 000026F4 EE                  <1> 	out	dx, al ; 20h -> set bit 5
  4031                              <1> 		        ; (after loading palette regs)	
  4032 000026F5 C3                  <1> 	retn
  4033                              <1> 
  4034                              <1> vga_write_char_attr:
  4035                              <1> vga_write_char_only: 
  4036                              <1> 	; 08/07/2016 (TRDOS 386 = TRDOS v2.0)
  4037                              <1> 	;
  4038                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4039                              <1> 	; vgabios-0.7a (2011)
  4040                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4041                              <1> 	; 'vgabios.c', 'biosfn_write_char_attr'
  4042                              <1> 	; 'biosfn_write_char_only'
  4043                              <1> 
  4044                              <1> 	; INPUT ->
  4045                              <1> 	; [CRT_MODE] = current video mode (>7)
  4046                              <1> 	; CX = Count of characters to write
  4047                              <1> 	; AL = Character to write
  4048                              <1> 	; BL = Color of character
  4049                              <1> 	; OUTPUT ->
  4050                              <1> 	; Regen buffer updated
  4051                              <1>  
  4052 000026F6 8A25[225F0000]      <1> 	mov 	ah, [CRT_MODE]
  4053 000026FC 668B15[DE580100]    <1> 	mov	dx, [CURSOR_POSN] ; cursor pos for page 0
  4054                              <1> 
  4055 00002703 BE[3E5F0000]        <1> 	mov	esi, vga_modes
  4056 00002708 89F7                <1> 	mov	edi, esi
  4057 0000270A 83C710              <1> 	add	edi, vga_mode_count
  4058                              <1> vga_wca_0:
  4059 0000270D AC                  <1> 	lodsb
  4060 0000270E 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4061 00002710 7405                <1> 	je	short vga_wca_2
  4062 00002712 39FE                <1> 	cmp	esi, edi
  4063 00002714 72F7                <1> 	jb	short vga_wca_0
  4064                              <1> vga_wca_1:
  4065 00002716 C3                  <1> 	retn	; nothing to do
  4066                              <1> vga_wca_2:
  4067 00002717 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  4068                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4069                              <1> 
  4070                              <1> 	; biosfn_write_char_attr (car,page,attr,count) 
  4071                              <1> 	; AL = car, page = 0, BL = attr, CX = count
  4072 0000271A 803E04              <1> 	cmp	byte [esi], PLANAR4
  4073 0000271D 741D                <1> 	je	short vga_wca_planar
  4074 0000271F 803E03              <1> 	cmp	byte [esi], PLANAR1
  4075 00002722 7418                <1> 	je	short vga_wca_planar
  4076                              <1> vga_wca_linear8:
  4077                              <1> 	; while((count-->0) && (xcurs<nbcols))
  4078                              <1> 	; CX = count
  4079 00002724 6621C9              <1> 	and	cx, cx
  4080 00002727 74ED                <1> 	jz	short vga_wca_1
  4081 00002729 3A15[245F0000]      <1> 	cmp	dl, [CRT_COLS]
  4082 0000272F 73E5                <1> 	jnb	short vga_wca_1
  4083                              <1> 	; write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols);
  4084                              <1> 	; AL = car, BL = attr, DL = xcurs, DH = ycurs, 
  4085                              <1> 	; [CRT_COLS] = nbcols
  4086 00002731 E81E000000          <1> 	call	write_gfx_char_lin	 
  4087 00002736 6649                <1> 	dec	cx ; count
  4088 00002738 FEC2                <1> 	inc	dl ; xcurs
  4089 0000273A EBE8                <1> 	jmp	short vga_wca_linear8
  4090                              <1> vga_wca_planar:
  4091                              <1> 	; while((count-->0) && (xcurs<nbcols))
  4092                              <1> 	; CX = count
  4093 0000273C 6621C9              <1> 	and	cx, cx
  4094 0000273F 74D5                <1> 	jz	short vga_wca_1
  4095 00002741 3A15[245F0000]      <1> 	cmp	dl, [CRT_COLS]
  4096 00002747 73CD                <1> 	jnb	short vga_wca_1
  4097                              <1> 	; write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight);
  4098                              <1> 	; AL = car, BL = attr, DL = xcurs, DH = ycurs, 
  4099                              <1> 	; [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight
  4100 00002749 E89D000000          <1> 	call	write_gfx_char_pl4
  4101 0000274E 6649                <1> 	dec	cx ; count
  4102 00002750 FEC2                <1> 	inc	dl ; xcurs
  4103 00002752 EBE8                <1> 	jmp	short vga_wca_planar
  4104                              <1> 
  4105                              <1> write_gfx_char_lin:
  4106                              <1> 	; 08/08/2016
  4107                              <1> 	; 31/07/2016
  4108                              <1> 	; 08/07/2016 (TRDOS 386 = TRDOS v2.0)
  4109                              <1> 	;
  4110                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4111                              <1> 	; vgabios-0.7a (2011)
  4112                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4113                              <1> 	; 'vgabios.c', 'write_gfx_char_lin'
  4114                              <1> 
  4115                              <1> 	; write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols)
  4116                              <1> 	; INPUT ->
  4117                              <1> 	; AL = car, BL = attr, DL = xcurs, DH = ycurs, 
  4118                              <1> 	; [CRT_COLS] = nbcols
  4119                              <1> 	; OUTPUT ->
  4120                              <1> 	; Regen buffer updated
  4121                              <1> 
  4122 00002754 51                  <1> 	push	ecx
  4123 00002755 53                  <1> 	push	ebx
  4124 00002756 52                  <1> 	push	edx
  4125 00002757 50                  <1> 	push	eax
  4126                              <1> 	; addr=xcurs*8+ycurs*nbcols*64;
  4127                              <1> 	; 08/08/2016
  4128 00002758 0FB6F0              <1> 	movzx	esi, al ; car
  4129 0000275B 0FB6C6              <1> 	movzx	eax, dh ; ycurs
  4130 0000275E 8A25[245F0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  4131 00002764 F6E4                <1> 	mul	ah
  4132                              <1> 	;shl	ax, 6 ; * 64
  4133 00002766 66C1E003            <1>  	shl	ax, 3 ; * 8
  4134                              <1> 	;sub	dh, dh
  4135                              <1> 	;shl	dx, 3 ; xcurs * 8
  4136                              <1> 	;movzx	edi, dx
  4137 0000276A 0FB6FA              <1> 	movzx	edi, dl
  4138 0000276D 66C1E703            <1> 	shl	di, 3 ; xcurs * 8
  4139 00002771 30F6                <1> 	xor	dh, dh
  4140 00002773 8A15[265F0000]      <1> 	mov	dl, [CHAR_HEIGHT]
  4141 00002779 66F7E2              <1> 	mul	dx
  4142                              <1> 	; eax = ycurs*nbcols*8*[CHAR_HEIGHT]
  4143 0000277C 01C7                <1> 	add	edi, eax ; addr
  4144 0000277E 81C700000A00        <1> 	add	edi, 0A0000h
  4145                              <1> 	;shl	si, 3 ; car * 8
  4146 00002784 30E4                <1> 	xor	ah, ah
  4147 00002786 A0[265F0000]        <1> 	mov	al, [CHAR_HEIGHT]
  4148 0000278B 66F7E6              <1> 	mul	si
  4149 0000278E 6689C6              <1> 	mov	si, ax
  4150                              <1> 	;; esi = src = car * 8
  4151                              <1> 	; esi = src = car * [CHAR_HEIGHT]
  4152                              <1> 	; i = 0
  4153                              <1> 	;add	esi, vgafont8 ; fdata [src+i]
  4154                              <1> 	; 08/08/2016
  4155 00002791 A1[6A650100]        <1> 	mov	eax, [VGA_INT43H]
  4156 00002796 3D[3C430100]        <1> 	cmp	eax, vgafont16
  4157 0000279B 740F                <1>         je      short wgfxl_0
  4158 0000279D 3D[3C350100]        <1> 	cmp	eax, vgafont14
  4159 000027A2 7408                <1> 	je	short wgfxl_0
  4160 000027A4 81C6[3C2D0100]      <1> 	add	esi, vgafont8
  4161 000027AA EB02                <1> 	jmp	short wgfxl_1
  4162                              <1> wgfxl_0:
  4163 000027AC 01C6                <1> 	add	esi, eax
  4164                              <1> wgfxl_1:
  4165 000027AE 28FF                <1> 	sub	bh, bh ; i = 0
  4166                              <1> wgfxl_2:
  4167                              <1> 	; for(i=0;i<8;i++)
  4168 000027B0 57                  <1> 	push	edi ; addr
  4169 000027B1 0FB605[245F0000]    <1> 	movzx	eax, byte [CRT_COLS] ; nbcols
  4170 000027B8 F6E7                <1> 	mul	bh ; nbcols*i
  4171 000027BA 66C1E003            <1> 	shl	ax, 3 ; i*nbcols*8
  4172                              <1>  	; dest=addr+i*nbcols*8;
  4173 000027BE 01C7                <1> 	add	edi, eax ; dest + j ; j = 0
  4174 000027C0 B180                <1> 	mov	cl, 80h ; mask = 0x80;
  4175                              <1> 	; esi = fdata + src + i
  4176                              <1> 	; for(j=0;j<8;j++)
  4177 000027C2 29D2                <1> 	sub	edx, edx ; j = 0
  4178                              <1> wgfxl_3:
  4179 000027C4 8A06                <1> 	mov	al, [esi] ; al = fdata[src+i]
  4180 000027C6 20C8                <1> 	and	al, cl ; if (fdata[src+i] & mask)
  4181 000027C8 7402                <1> 	jz	short wgfxl_4  ; data = 0, zf = 1
  4182 000027CA 88D8                <1> 	mov	al, bl ; data = attr;
  4183                              <1> wgfxl_4:
  4184                              <1> 	; write_byte(0xa000,dest+j,data);		
  4185 000027CC AA                  <1> 	stosb  ; dest + j (+ 0A0000h)
  4186                              <1> 	;inc	dl ; j++
  4187                              <1> 	;cmp	dl, 8
  4188 000027CD 80FA07              <1> 	cmp	dl, 7
  4189 000027D0 720E                <1> 	jb	short wgfxl_5
  4190 000027D2 5F                  <1> 	pop	edi
  4191                              <1> 	; 08/08/2016
  4192                              <1> 	;cmp	bh, 7
  4193                              <1> 	;jnb	short wgfxl_6
  4194 000027D3 FEC7                <1> 	inc	bh ; i++
  4195 000027D5 3A3D[265F0000]      <1> 	cmp	bh, [CHAR_HEIGHT]
  4196 000027DB 7309                <1> 	jnb	short wgfxl_6
  4197 000027DD 46                  <1> 	inc	esi
  4198 000027DE EBD0                <1> 	jmp	short wgfxl_2
  4199                              <1> wgfxl_5:
  4200 000027E0 D0E9                <1> 	shr	cl, 1 ; mask >>= 1;
  4201 000027E2 FEC2                <1> 	inc	dl ; j++
  4202 000027E4 EBDE                <1>         jmp     short wgfxl_3
  4203                              <1> wgfxl_6:
  4204 000027E6 58                  <1> 	pop	eax
  4205 000027E7 5A                  <1> 	pop	edx
  4206 000027E8 5B                  <1> 	pop	ebx
  4207 000027E9 59                  <1> 	pop	ecx
  4208 000027EA C3                  <1> 	retn
  4209                              <1> 
  4210                              <1> write_gfx_char_pl4:
  4211                              <1> 	; 08/08/2016
  4212                              <1> 	; 08/07/2016 (TRDOS 386 = TRDOS v2.0)
  4213                              <1> 	;
  4214                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4215                              <1> 	; vgabios-0.7a (2011)
  4216                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4217                              <1> 	; 'vgabios.c', 'write_gfx_char_pl4'
  4218                              <1> 
  4219                              <1> 	; write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight)
  4220                              <1> 	; INPUT ->
  4221                              <1> 	; AL = car, BL = attr, DL = xcurs, DH = ycurs, 
  4222                              <1> 	; [CRT_COLS] = nbcols, [CHAR_HEIGHT] = cheight
  4223                              <1> 	; OUTPUT ->
  4224                              <1> 	; Regen buffer updated
  4225                              <1> 
  4226 000027EB 51                  <1> 	push	ecx
  4227 000027EC 53                  <1> 	push	ebx
  4228 000027ED 52                  <1> 	push	edx
  4229 000027EE 50                  <1> 	push	eax
  4230                              <1> wgfxpl_f0:
  4231                              <1> 	; switch(cheight)
  4232 000027EF 8A25[265F0000]      <1> 	mov	ah, [CHAR_HEIGHT]
  4233 000027F5 80FC10              <1> 	cmp	ah, 16 ; case 16:
  4234 000027F8 7507                <1> 	jne	short wgfxpl_f1
  4235                              <1> 	; fdata = &vgafont16;
  4236 000027FA BE[3C430100]        <1> 	mov	esi, vgafont16
  4237 000027FF EB13                <1> 	jmp	short wgfxpl_f3
  4238                              <1> wgfxpl_f1:
  4239 00002801 80FC0E              <1> 	cmp	ah, 14 ; case 14:
  4240 00002804 7507                <1> 	jne	short wgfxpl_f2
  4241 00002806 BE[3C350100]        <1> 	mov	esi, vgafont14
  4242 0000280B EB07                <1> 	jmp	short wgfxpl_f3
  4243                              <1> wgfxpl_f2:
  4244                              <1> 	; default:
  4245                              <1> 	;  fdata = &vgafont8;
  4246 0000280D BE[3C2D0100]        <1> 	mov	esi, vgafont8
  4247 00002812 B408                <1> 	mov	ah, 8	
  4248                              <1> wgfxpl_f3:
  4249                              <1> 	; al = car
  4250 00002814 F6E4                <1> 	mul	ah ; ah = cheight
  4251 00002816 25FFFF0000          <1> 	and	eax, 0FFFFh ; car * cheight
  4252                              <1> 	; src = car * cheight;
  4253 0000281B 01C6                <1> 	add	esi, eax ; esi = fdata[src+i]
  4254                              <1> 	; addr=xcurs*8+ycurs*nbcols*64;
  4255 0000281D 88F0                <1> 	mov	al, dh ; ycurs
  4256 0000281F 8A25[245F0000]      <1> 	mov	ah, [CRT_COLS] ; nbcols
  4257 00002825 F6E4                <1> 	mul	ah
  4258                              <1> 	; 08/08/2016
  4259                              <1> 	;shl	ax, 6 ; * 64
  4260 00002827 66C1E003            <1> 	shl	ax, 3 ; * 8
  4261                              <1> 	;sub	dh, dh ; 0
  4262                              <1> 	;shl	dx, 3 ; xcurs * 8
  4263                              <1> 	;movzx	edi, dx
  4264 0000282B 0FB6FA              <1> 	movzx	edi, dl
  4265 0000282E 66C1E703            <1> 	shl	di, 3 ; xcurs * 8
  4266 00002832 30F6                <1> 	xor	dh, dh
  4267 00002834 8A15[265F0000]      <1> 	mov	dl, [CHAR_HEIGHT]
  4268 0000283A 66F7E2              <1> 	mul	dx
  4269                              <1> 	; eax = ycurs*nbcols*8*[CHAR_HEIGHT]
  4270 0000283D 01C7                <1> 	add	edi, eax ; addr
  4271 0000283F 81C700000A00        <1> 	add	edi, 0A0000h
  4272                              <1> 	;
  4273                              <1> 	; outw(VGAREG_SEQU_ADDRESS, 0x0f02);
  4274                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0205);
  4275 00002845 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  4276 00002849 66B8020F            <1> 	mov	ax, 0F02h
  4277 0000284D 66EF                <1> 	out	dx, ax
  4278 0000284F 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4279 00002853 66B80502            <1> 	mov	ax, 0205h
  4280 00002857 66EF                <1> 	out	dx, ax
  4281                              <1> 	;
  4282 00002859 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4283 0000285D F6C380              <1> 	test	bl, 80h ; if(attr&0x80)
  4284 00002860 7406                <1> 	jz	short wgfxpl_f4 ; else
  4285                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x1803);
  4286 00002862 66B80318            <1> 	mov	ax, 1803h
  4287 00002866 EB04                <1> 	jmp	short wgfxpl_f5
  4288                              <1> wgfxpl_f4:
  4289                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0003);
  4290 00002868 66B80300            <1> 	mov	ax, 0003h	
  4291                              <1> wgfxpl_f5:
  4292 0000286C 66EF                <1> 	out	dx, ax
  4293                              <1> 	;	
  4294 0000286E 28FF                <1> 	sub	bh, bh ; i = 0
  4295                              <1> wgfxpl_0:
  4296                              <1> 	; for(i=0;i<cheight;i++)
  4297 00002870 57                  <1> 	push	edi ; addr
  4298 00002871 0FB605[245F0000]    <1> 	movzx	eax, byte [CRT_COLS] ; nbcols
  4299 00002878 F6E7                <1> 	mul	bh ; nbcols*i
  4300                              <1> 	; dest=addr+i*nbcols
  4301 0000287A 01C7                <1> 	add	edi, eax ; dest
  4302 0000287C B580                <1> 	mov	ch, 80h ; mask = 0x80;
  4303                              <1> 	; for(j=0;j<8;j++)
  4304 0000287E 28C9                <1> 	sub	cl, cl ; j = 0
  4305                              <1> wgfxpl_1:
  4306 00002880 D2ED                <1> 	shr	ch, cl ; mask=0x80>>j;
  4307                              <1> 	;
  4308                              <1> 	; outw(VGAREG_GRDC_ADDRESS, (mask << 8) | 0x08);
  4309                              <1>      	; read_byte(0xa000,dest);
  4310                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4311 00002882 88EC                <1> 	mov	ah, ch
  4312 00002884 B008                <1> 	mov	al, 8
  4313 00002886 66EF                <1> 	out	dx, ax
  4314 00002888 8A07                <1> 	mov	al, [edi] ; ? (io delay?)
  4315                              <1> 	;
  4316 0000288A 28C0                <1> 	sub	al, al ; attr = 0
  4317                              <1> 	; if (fdata[src+i] & mask)
  4318 0000288C 842E                <1> 	test	byte [esi], ch
  4319 0000288E 7404                <1> 	jz	short wgfxpl_2  ; zf = 1
  4320                              <1> 	; write_byte(0xa000,dest,attr&0x0f);
  4321 00002890 88D8                <1> 	mov	al, bl ; attr;
  4322 00002892 240F                <1> 	and	al, 0Fh	; attr&0x0f
  4323                              <1> wgfxpl_2:
  4324                              <1> 	; write_byte(0xa000,dest,0x00);		
  4325 00002894 8807                <1> 	mov	[edi], al ; dest (+ 0A0000h)
  4326 00002896 FEC1                <1> 	inc	cl ; j++
  4327 00002898 80F908              <1> 	cmp	cl, 8
  4328 0000289B 72E3                <1> 	jb	short wgfxpl_1
  4329 0000289D 5F                  <1> 	pop	edi
  4330                              <1> 	; 08/08/2016
  4331                              <1> 	;cmp	bh, 7
  4332                              <1> 	;jnb	short wgfxpl_3
  4333 0000289E FEC7                <1> 	inc	bh ; i++
  4334 000028A0 3A3D[265F0000]      <1> 	cmp	bh, [CHAR_HEIGHT]
  4335 000028A6 7303                <1> 	jnb	short wgfxpl_3
  4336 000028A8 46                  <1> 	inc	esi
  4337 000028A9 EBC5                <1> 	jmp	short wgfxpl_0
  4338                              <1> wgfxpl_3:
  4339                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4340 000028AB 66B808FF            <1>   	mov	ax, 0FF08h
  4341 000028AF 66EF                <1> 	out	dx, ax
  4342 000028B1 66B80500            <1> 	mov	ax, 0005h
  4343 000028B5 66EF                <1> 	out	dx, ax
  4344 000028B7 66B80300            <1> 	mov	ax, 0003h
  4345 000028BB 66EF                <1> 	out	dx, ax
  4346                              <1> 	;
  4347 000028BD 58                  <1> 	pop	eax
  4348 000028BE 5A                  <1> 	pop	edx
  4349 000028BF 5B                  <1> 	pop	ebx
  4350 000028C0 59                  <1> 	pop	ecx
  4351 000028C1 C3                  <1> 	retn
  4352                              <1> 
  4353                              <1> vga_write_pixel: 
  4354                              <1> 	; 09/07/2016 (TRDOS 386 = TRDOS v2.0)
  4355                              <1> 	;
  4356                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4357                              <1> 	; vgabios-0.7a (2011)
  4358                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4359                              <1> 	; 'vgabios.c', 'biosfn_write_pixel'
  4360                              <1> 
  4361                              <1> 	; INPUT ->
  4362                              <1> 	; 	DX = row (0-239)
  4363                              <1> 	; 	CX = column (0-799)
  4364                              <1> 	; 	AL = pixel value
  4365                              <1> 	;	(AH = [CRT_MODE])
  4366                              <1> 	; OUTPUT ->
  4367                              <1> 	; 	none
  4368                              <1>  
  4369 000028C2 88C3                <1> 	mov	bl, al ; pixel value
  4370                              <1> 	;mov 	ah, [CRT_MODE]
  4371 000028C4 BE[3E5F0000]        <1> 	mov	esi, vga_modes
  4372 000028C9 89F7                <1> 	mov	edi, esi
  4373 000028CB 83C710              <1> 	add	edi, vga_mode_count
  4374                              <1> vga_wp_0:
  4375 000028CE AC                  <1> 	lodsb
  4376 000028CF 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4377 000028D1 7405                <1> 	je	short vga_wp_1
  4378 000028D3 39FE                <1> 	cmp	esi, edi
  4379 000028D5 72F7                <1> 	jb	short vga_wp_0
  4380 000028D7 C3                  <1> 	retn	; nothing to do
  4381                              <1> vga_wp_1:
  4382 000028D8 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  4383                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4384 000028DB BF00000A00          <1> 	mov	edi, 0A0000h
  4385                              <1> 	;
  4386 000028E0 803E04              <1> 	cmp	byte [esi], PLANAR4
  4387 000028E3 741D                <1> 	je	short vga_wp_planar
  4388 000028E5 803E03              <1> 	cmp	byte [esi], PLANAR1
  4389 000028E8 7418                <1> 	je	short vga_wp_planar
  4390                              <1> vga_wp_linear8:
  4391                              <1> 	; addr=CX+DX*(read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8);
  4392 000028EA 0FB605[245F0000]    <1> 	movzx	eax, byte [CRT_COLS] ; = [VGA_COLS] ; nbcols
  4393 000028F1 66C1E003            <1>      	shl	ax, 3 ; * 8
  4394 000028F5 66F7E2              <1> 	mul	dx
  4395 000028F8 50                  <1> 	push	eax
  4396                              <1> 	;mov	edi, 0A0000h
  4397 000028F9 6601CF              <1> 	add	di, cx
  4398 000028FC 58                  <1> 	pop	eax
  4399 000028FD 01C7                <1> 	add	edi, eax ; addr
  4400                              <1> 	; write_byte(0xa000,addr,AL);
  4401 000028FF 881F                <1> 	mov	[edi], bl
  4402 00002901 C3                  <1> 	retn    
  4403                              <1> vga_wp_planar:
  4404                              <1> 	; addr = CX/8+DX*read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
  4405 00002902 0FB7C1              <1> 	movzx	eax, cx
  4406 00002905 66C1E803            <1> 	shr	ax, 3 ; CX/8
  4407 00002909 50                  <1> 	push	eax
  4408 0000290A 28E4                <1> 	sub	ah, ah ; 0
  4409 0000290C A0[245F0000]        <1> 	mov	al, [CRT_COLS] ; = [VGA_COLS] ; nbcols
  4410 00002911 66F7E2              <1> 	mul	dx
  4411                              <1> 	;mov	edi, 0A0000h
  4412 00002914 6601C7              <1>         add     di, ax
  4413 00002917 58                  <1> 	pop	eax
  4414 00002918 01C7                <1> 	add	edi, eax ; addr
  4415 0000291A 80E107              <1> 	and	cl, 7
  4416 0000291D B580                <1> 	mov	ch, 80h ; mask
  4417 0000291F D2ED                <1> 	shr	ch, cl 	; mask = 0x80 >> (CX & 0x07);
  4418                              <1> 	
  4419                              <1> 	; outw(VGAREG_GRDC_ADDRESS, (mask << 8) | 0x08);
  4420 00002921 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4421 00002925 88EC                <1> 	mov	ah, ch
  4422 00002927 B008                <1> 	mov	al, 8
  4423 00002929 66EF                <1> 	out	dx, ax
  4424                              <1> 	; outw(VGAREG_GRDC_ADDRESS, 0x0205);
  4425 0000292B 66B80502            <1> 	mov	ax, 0205h
  4426 0000292F 66EF                <1> 	out	dx, ax
  4427                              <1> 	; data = read_byte(0xa000,addr);
  4428 00002931 8A07                <1> 	mov	al, [edi] ; (delay?)	
  4429                              <1> 	; if (AL & 0x80)
  4430                              <1> 	; {
  4431                              <1> 	;  outw(VGAREG_GRDC_ADDRESS, 0x1803);
  4432                              <1> 	; }
  4433 00002933 F6C380              <1> 	test	bl, 80h
  4434 00002936 7406                <1> 	jz	short vga_wp_2
  4435 00002938 66B80318            <1> 	mov	ax, 1803h
  4436 0000293C 66EF                <1> 	out	dx, ax
  4437                              <1> vga_wp_2:	
  4438                              <1> 	; write_byte(0xa000,addr,AL);
  4439 0000293E 881F                <1> 	mov	[edi], bl
  4440                              <1> 	;
  4441                              <1> 	;mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4442 00002940 66B808FF            <1>   	mov	ax, 0FF08h
  4443 00002944 66EF                <1> 	out	dx, ax
  4444 00002946 66B80500            <1> 	mov	ax, 0005h
  4445 0000294A 66EF                <1> 	out	dx, ax
  4446 0000294C 66B80300            <1> 	mov	ax, 0003h
  4447 00002950 66EF                <1> 	out	dx, ax
  4448                              <1> 	;
  4449 00002952 C3                  <1> 	retn
  4450                              <1> 
  4451                              <1> vga_read_pixel: 
  4452                              <1> 	; 09/07/2016 (TRDOS 386 = TRDOS v2.0)
  4453                              <1> 	;
  4454                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4455                              <1> 	; vgabios-0.7a (2011)
  4456                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4457                              <1> 	; 'vgabios.c', 'biosfn_read_pixel'
  4458                              <1> 
  4459                              <1> 	; INPUT ->
  4460                              <1> 	; 	DX = row (0-239)
  4461                              <1> 	; 	CX = column (0-799)
  4462                              <1> 	;	(AH = [CRT_MODE])
  4463                              <1> 	; OUTPUT ->
  4464                              <1> 	; 	AL = pixel value
  4465                              <1> 	 
  4466                              <1> 	;mov 	ah, [CRT_MODE]
  4467 00002953 BE[3E5F0000]        <1> 	mov	esi, vga_modes
  4468 00002958 89F7                <1> 	mov	edi, esi
  4469 0000295A 83C710              <1> 	add	edi, vga_mode_count
  4470                              <1> vga_rp_0:
  4471 0000295D AC                  <1> 	lodsb
  4472 0000295E 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4473 00002960 7405                <1> 	je	short vga_rp_1
  4474 00002962 39FE                <1> 	cmp	esi, edi
  4475 00002964 72F7                <1> 	jb	short vga_rp_0
  4476 00002966 C3                  <1> 	retn	; nothing to do
  4477                              <1> vga_rp_1:
  4478 00002967 83C64F              <1> 	add	esi, vga_memmodel - (vga_modes + 1)  
  4479                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4480 0000296A BF00000A00          <1> 	mov	edi, 0A0000h
  4481                              <1> 	;
  4482 0000296F 803E04              <1> 	cmp	byte [esi], PLANAR4
  4483 00002972 741D                <1> 	je	short vga_rp_planar
  4484 00002974 803E03              <1> 	cmp	byte [esi], PLANAR1
  4485 00002977 7418                <1> 	je	short vga_rp_planar
  4486                              <1> vga_rp_linear8:
  4487                              <1> 	; addr=CX+DX*(read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS)*8);
  4488 00002979 0FB605[245F0000]    <1> 	movzx	eax, byte [CRT_COLS] ; = [VGA_COLS] ; nbcols
  4489 00002980 66C1E003            <1>      	shl	ax, 3 ; * 8
  4490 00002984 66F7E2              <1> 	mul	dx
  4491 00002987 50                  <1> 	push	eax
  4492                              <1> 	;mov	edi, 0A0000h
  4493 00002988 6601CF              <1> 	add	di, cx
  4494 0000298B 58                  <1> 	pop	eax
  4495 0000298C 01C7                <1> 	add	edi, eax ; addr
  4496                              <1> 	; attr=read_byte(0xa000,addr);
  4497 0000298E 8A07                <1> 	mov	al, [edi] ; pixel value
  4498 00002990 C3                  <1> 	retn    
  4499                              <1> vga_rp_planar:
  4500                              <1> 	; addr = CX/8+DX*read_word(BIOSMEM_SEG,BIOSMEM_NB_COLS);
  4501 00002991 0FB7C1              <1> 	movzx	eax, cx
  4502 00002994 66C1E803            <1> 	shr	ax, 3 ; CX/8
  4503 00002998 50                  <1> 	push	eax
  4504 00002999 28E4                <1> 	sub	ah, ah ; 0
  4505 0000299B A0[245F0000]        <1> 	mov	al, [CRT_COLS] ; = [VGA_COLS] ; nbcols
  4506 000029A0 66F7E2              <1> 	mul	dx
  4507                              <1> 	;mov	edi, 0A0000h
  4508 000029A3 6601C7              <1>         add     di, ax
  4509 000029A6 58                  <1> 	pop	eax
  4510 000029A7 01C7                <1> 	add	edi, eax ; addr
  4511 000029A9 80E107              <1> 	and	cl, 7
  4512 000029AC B580                <1> 	mov	ch, 80h ; mask
  4513 000029AE D2ED                <1> 	shr	ch, cl 	; mask = 0x80 >> (CX & 0x07);
  4514                              <1> 	; attr = 0x00;
  4515 000029B0 30DB                <1> 	xor	bl, bl ; attr = bl = 0, 
  4516 000029B2 30C9                <1> 	xor	cl, cl ; i = cl = 0
  4517                              <1> 	; for(i=0;i<4;i++)
  4518                              <1>       	; {
  4519                              <1>        	;  outw(VGAREG_GRDC_ADDRESS, (i << 8) | 0x04);
  4520                              <1>        	;  data = read_byte(0xa000,addr) & mask;
  4521                              <1>        	;  if (data > 0) attr |= (0x01 << i);
  4522                              <1>       	; }
  4523                              <1> vga_rp_2:
  4524 000029B4 88CC                <1> 	mov	ah, cl ; i << 8
  4525 000029B6 B004                <1> 	mov	al, 4  ; | 0x04
  4526 000029B8 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4527 000029BC 66EF                <1> 	out	dx, ax
  4528                              <1> 	; data = read_byte(0xa000,addr) & mask;
  4529 000029BE 8A07                <1> 	mov	al, [edi]
  4530 000029C0 20E8                <1> 	and	al, ch ; & mask
  4531                              <1> 	; if (data > 0) attr |= (0x01 << i);
  4532 000029C2 08C0                <1> 	or	al, al
  4533 000029C4 7408                <1> 	jz	short vga_rp_3 ; al = 0 
  4534 000029C6 B701                <1> 	mov	bh, 1
  4535 000029C8 D2E7                <1> 	shl	bh, cl ; (0x01 << i)
  4536 000029CA 08FB                <1> 	or	bl, bh ; attr |= (0x01 << i)
  4537 000029CC 88D8                <1> 	mov	al, bl ; pixel value	
  4538                              <1> vga_rp_3:	
  4539 000029CE C3                  <1> 	retn
  4540                              <1> 
  4541                              <1> vga_beeper:
  4542                              <1> 	; 04/08/2016  (TRDOS 386 = TRDOS v2.0)
  4543 000029CF FB                  <1> 	sti
  4544                              <1> 	;mov	bh, [ACTIVE_PAGE]
  4545 000029D0 E9CFF3FFFF          <1>         jmp     beeper_gfx
  4546                              <1> 
  4547                              <1> vga_write_teletype:
  4548                              <1> 	; 09/12/2017
  4549                              <1> 	; 06/08/2016
  4550                              <1> 	; 04/08/2016
  4551                              <1> 	; 01/08/2016
  4552                              <1> 	; 31/07/2016
  4553                              <1> 	; 09/07/2016 (TRDOS 386 = TRDOS v2.0)
  4554                              <1> 	;
  4555                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4556                              <1> 	; vgabios-0.7a (2011)
  4557                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4558                              <1> 	; 'vgabios.c', 'biosfn_write_teletype'
  4559                              <1> 	; 'biosfn_write_char_only'
  4560                              <1> 
  4561                              <1> 	; INPUT ->
  4562                              <1> 	; [CRT_MODE] = current video mode (>7)
  4563                              <1> 	; AL = Character to write
  4564                              <1> 	; BL = Color of character
  4565                              <1> 	; OUTPUT ->
  4566                              <1> 	; Regen buffer updated
  4567                              <1> 
  4568                              <1> 	; biosfn_write_teletype (car, page, attr, flag) 
  4569                              <1> 	; car = character (AL)
  4570                              <1> 	; page = 0
  4571                              <1> 	; attr = color (BL)
  4572                              <1> 	; 'flag' not used
  4573                              <1> 
  4574 000029D5 8A25[225F0000]      <1> 	mov 	ah, [CRT_MODE]
  4575 000029DB 88C7                <1> 	mov	bh, al ; character
  4576 000029DD 668B15[DE580100]    <1> 	mov	dx, [CURSOR_POSN] ; cursor pos for page 0
  4577                              <1> 
  4578 000029E4 BE[465F0000]        <1> 	mov	esi, vga_g_modes
  4579 000029E9 89F7                <1> 	mov	edi, esi
  4580 000029EB 83C708              <1> 	add	edi, vga_g_mode_count
  4581                              <1> vga_wtty_0:
  4582 000029EE AC                  <1> 	lodsb
  4583 000029EF 38E0                <1> 	cmp	al, ah ; [CRT_MODE]
  4584 000029F1 7405                <1> 	je	short vga_wtty_2
  4585 000029F3 39FE                <1> 	cmp	esi, edi
  4586 000029F5 72F7                <1> 	jb	short vga_wtty_0
  4587                              <1> vga_wtty_1:
  4588 000029F7 C3                  <1> 	retn	; nothing to do
  4589                              <1> vga_wtty_2:
  4590 000029F8 80FF07              <1> 	cmp	bh, 07h ; bell (beep)
  4591 000029FB 74D2                <1> 	je	short vga_beeper  ; u11
  4592 000029FD 80FF08              <1> 	cmp	bh, 08h ; backspace
  4593 00002A00 7508                <1> 	jne	short vga_wtty_3
  4594                              <1> 	; if(xcurs>0)xcurs--;
  4595 00002A02 08D2                <1> 	or	dl, dl ; xcurs (column)
  4596 00002A04 74F1                <1> 	jz	short vga_wtty_1
  4597 00002A06 FECA                <1> 	dec	dl ; xcurs--;
  4598 00002A08 EB59                <1>         jmp     short vga_wtty_12 
  4599                              <1> vga_wtty_3:			
  4600 00002A0A 80FF0D              <1> 	cmp	bh, 0Dh ; carriage return (\r)
  4601 00002A0D 7504                <1> 	jne	short vga_wtty_4
  4602                              <1> 	; xcurs=0;
  4603 00002A0F 28D2                <1> 	sub	dl, dl ; 0
  4604 00002A11 EB50                <1>         jmp     short vga_wtty_12 
  4605                              <1> vga_wtty_4:	
  4606 00002A13 80FF0A              <1> 	cmp	bh, 0Ah ; new line (\n)
  4607 00002A16 7504                <1> 	jne	short vga_wtty_5
  4608                              <1> 	; ycurs++;
  4609 00002A18 FEC6                <1> 	inc	dh ; next row
  4610 00002A1A EB62                <1>         jmp     short vga_wtty_11
  4611                              <1> vga_wtty_5:
  4612 00002A1C 80FF09              <1> 	cmp 	bh, 09h ; tab stop
  4613 00002A1F 7527                <1> 	jne	short vga_wtty_8
  4614 00002A21 88D0                <1> 	mov	al, dl
  4615                              <1> 	;cbw
  4616 00002A23 30E4                <1> 	xor	ah, ah ; 09/12/2017
  4617 00002A25 B108                <1> 	mov	cl, 8
  4618 00002A27 F6F1                <1> 	div	cl
  4619 00002A29 28E1                <1> 	sub	cl, ah
  4620                              <1> 	;
  4621 00002A2B B720                <1> 	mov	bh, 20h ; space
  4622                              <1> vga_wtty_6: ; tab stop loop
  4623 00002A2D 6651                <1> 	push	cx
  4624 00002A2F 6653                <1> 	push	bx
  4625 00002A31 E812000000          <1> 	call	vga_wtty_8
  4626 00002A36 665B                <1> 	pop	bx  ; bh = character, bl = color
  4627 00002A38 6659                <1> 	pop	cx
  4628 00002A3A FEC9                <1> 	dec	cl
  4629 00002A3C 7409                <1> 	jz	short vga_wtty_7
  4630 00002A3E 668B15[DE580100]    <1> 	mov	dx, [CURSOR_POSN] ; new cursor position (pg 0)
  4631 00002A45 EBE6                <1> 	jmp	short vga_wtty_6
  4632                              <1> vga_wtty_7:
  4633 00002A47 C3                  <1> 	retn
  4634                              <1> 	;
  4635                              <1> vga_wtty_8:
  4636 00002A48 83C64F              <1> 	add	esi, vga_g_memmodel - (vga_g_modes + 1)  
  4637                              <1> 	; [ESI] = VGA memory model number (LINEAR8, PLANAR4, PLANAR1)
  4638 00002A4B BF00000A00          <1> 	mov	edi, 0A0000h
  4639                              <1> 	;
  4640 00002A50 88F8                <1> 	mov	al, bh ; character
  4641                              <1> 	;
  4642 00002A52 803E04              <1> 	cmp	byte [esi], PLANAR4
  4643 00002A55 7414                <1> 	je	short vga_wtty_planar
  4644 00002A57 803E03              <1> 	cmp	byte [esi], PLANAR1
  4645 00002A5A 740F                <1> 	je	short vga_wtty_planar
  4646                              <1> vga_wtty_linear8:
  4647                              <1> 	; write_gfx_char_lin(car,attr,xcurs,ycurs,nbcols);
  4648                              <1> 	; AL = car, BL = attr (color), DL = xcurs, DH = ycurs, 
  4649                              <1> 	; [CRT_COLS] = nbcols
  4650 00002A5C E8F3FCFFFF          <1> 	call	write_gfx_char_lin
  4651 00002A61 EB0D                <1> 	jmp	short vga_wtty_9
  4652                              <1> 
  4653                              <1> vga_wtty_12:
  4654                              <1> 	; 09/07/2016
  4655                              <1> 	; set cursor position
  4656                              <1> 	; NOTE: Hardware cursor position will not be set
  4657                              <1> 	;   in any VGA modes (>7)
  4658                              <1> 	;   But, cursor position will be saved into
  4659                              <1> 	;   [CURSOR_POSN].
  4660                              <1> 	;   TRDOS 386 (TRDOS v2.0) uses only one page
  4661                              <1> 	;   (page 0) for all graphics modes.
  4662                              <1> 
  4663 00002A63 668915[DE580100]    <1> 	mov	[CURSOR_POSN], dx ; save cursor pos for pg 0
  4664                              <1> 	; 04/08/2016
  4665                              <1> 	;mov	bh, [ACTIVE_PAGE] ; = 0
  4666                              <1> 	;call	_set_cpos
  4667 00002A6A C3                  <1> 	retn
  4668                              <1> 
  4669                              <1> vga_wtty_planar:
  4670                              <1> 	; write_gfx_char_pl4(car,attr,xcurs,ycurs,nbcols,cheight);
  4671                              <1> 	; AL = car, BL = attr (color), DL = xcurs, DH = ycurs, 
  4672                              <1> 	; [CRT_COLS]= nbcols, [CHAR_HEIGHT] = cheight
  4673 00002A6B E87BFDFFFF          <1> 	call	write_gfx_char_pl4
  4674                              <1> vga_wtty_9:
  4675 00002A70 FEC2                <1> 	inc	dl ; xcurs++;
  4676                              <1> vga_wtty_10:
  4677                              <1> 	; Do we need to wrap ?
  4678                              <1> 	; if(xcurs==nbcols)
  4679 00002A72 3A15[245F0000]      <1> 	cmp	dl, [CRT_COLS] ; [VGA_COLS]
  4680 00002A78 7204                <1> 	jb	short vga_wtty_11 ; no
  4681 00002A7A 28D2                <1> 	sub	dl, dl ; xcurs=0;
  4682 00002A7C FEC6                <1> 	inc	dh ;  ycurs++;
  4683                              <1> vga_wtty_11:
  4684                              <1> 	; Do we need to scroll ?
  4685                              <1> 	; if(ycurs==nbrows)
  4686 00002A7E 3A35[2A5F0000]      <1> 	cmp	dh, [VGA_ROWS]
  4687 00002A84 72DD                <1> 	jb	short vga_wtty_12 ; no
  4688                              <1> 	;
  4689                              <1> 	; biosfn_scroll (nblines,attr,rul,cul,rlr,clr,page,dir)
  4690                              <1> 	; al = nblines = 1, bl = attr (color) = 0
  4691                              <1> 	; ch = rul, cl = cul, dh = rlr, dl = clr, page = 0
  4692                              <1> 	; dir = SCROLL_UP
  4693                              <1> 	
  4694 00002A86 B001                <1> 	mov	al, 1
  4695 00002A88 28DB                <1> 	sub	bl, bl ; 0 ; blank/black line (attr=0) will be used
  4696 00002A8A 6629C9              <1> 	sub	cx, cx ; 0,0
  4697                              <1> 
  4698                              <1> 	; 06/08/2016
  4699 00002A8D 8A35[2A5F0000]      <1> 	mov	dh, [VGA_ROWS]
  4700 00002A93 FECE                <1> 	dec	dh ; nbrows -1
  4701                              <1> 
  4702 00002A95 6652                <1> 	push	dx 	; 04/08/2016
  4703 00002A97 8A15[245F0000]      <1> 	mov	dl, [CRT_COLS]
  4704 00002A9D FECA                <1> 	dec	dl ; nbcols -1
  4705                              <1> 	
  4706 00002A9F 8A25[225F0000]      <1> 	mov	ah, [CRT_MODE]
  4707                              <1> 	
  4708                              <1> 	; biosfn_scroll(0x01,0x00,0,0,nbrows-1,nbcols-1,page,SCROLL_UP);
  4709 00002AA5 E808F5FFFF          <1> 	call	vga_graphics_up
  4710                              <1> 	; 04/08/2016
  4711 00002AAA 665A                <1> 	pop	dx
  4712                              <1> 	;dec	dh ; ycurs-=1
  4713 00002AAC EBB5                <1> 	jmp	short vga_wtty_12 
  4714                              <1> 
  4715                              <1> font_setup:
  4716                              <1> 	; 09/07/2016
  4717                              <1> 	; character generator (font loading) functions
  4718                              <1> 	;
  4719                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4720                              <1> 	; vgabios-0.7a (2011)
  4721                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4722                              <1> 	; 'vgabios.c', 'int10_func'
  4723                              <1> 
  4724                              <1> 	; AX = 1100H ; Load User-Defined Font (EGA/VGA)
  4725                              <1> 	;
  4726                              <1>         ; BH    height of each character (bytes per character definition)
  4727                              <1>         ; (BL   font block to load (EGA: 0-3; VGA: 0-7))
  4728                              <1> 	; CX    number of characters to redefine (<=256)
  4729                              <1>         ; DX    ASCII code of the first character defined at ES:BP
  4730                              <1>         ; EBP	address of font-definition information
  4731                              <1> 	;	(in user's memory space)
  4732                              <1> 
  4733                              <1> 	; case 0x11:
  4734                              <1>      	; switch(GET_AL())
  4735                              <1>       	; {
  4736                              <1> 	; case 0x00:
  4737                              <1>         ; case 0x10:
  4738                              <1>         ; biosfn_load_text_user_pat(GET_AL(),ES,BP,CX,DX,GET_BL(),GET_BH());
  4739                              <1>         ; break;
  4740                              <1> 
  4741                              <1> 	; AX = 1110H ; Load and Activate User-Defined Font (EGA/VGA)
  4742 00002AAE 08C0                <1> 	or	al, al ; 0
  4743 00002AB0 7404                <1> 	jz	short font_setup_0
  4744 00002AB2 3C10                <1> 	cmp	al, 10h
  4745 00002AB4 7511                <1> 	jne	short font_setup_1	
  4746                              <1> font_setup_0:
  4747 00002AB6 E8B7000000          <1> 	call	transfer_user_fonts
  4748 00002ABB 721C                <1> 	jc	short font_setup_error
  4749 00002ABD E8C2000000          <1> 	call	load_text_user_pat
  4750 00002AC2 E996EAFFFF          <1>         jmp     VIDEO_RETURN 
  4751                              <1> font_setup_1:
  4752                              <1> 	; AX = 1101H ; Load ROM 8x14 Character Set (EGA/VGA)
  4753                              <1> 	; case 0x01:
  4754                              <1>         ; case 0x11:
  4755                              <1>         ; biosfn_load_text_8_14_pat(GET_AL(),GET_BL());
  4756                              <1>         ; break;
  4757 00002AC7 3C01                <1> 	cmp	al, 1
  4758 00002AC9 7404                <1> 	je	short font_setup_2
  4759 00002ACB 3C11                <1> 	cmp	al, 11h
  4760 00002ACD 7511                <1> 	jne	short font_setup_3	
  4761                              <1> font_setup_2:
  4762                              <1> 	; AX = 1111H ; Load and Activate ROM 8x14 Character Set (EGA/VGA)
  4763                              <1> 	; (BL = font block to load (EGA: 0-3; VGA: 0-7))
  4764 00002ACF E8EE010000          <1> 	call	load_text_8_14_pat
  4765 00002AD4 E984EAFFFF          <1>         jmp     VIDEO_RETURN
  4766                              <1> font_setup_error:
  4767 00002AD9 29C0                <1> 	sub	eax, eax ; 0 -> fonts could not be loaded
  4768 00002ADB E982EAFFFF          <1> 	jmp	_video_return
  4769                              <1> font_setup_3:
  4770                              <1> 	; AX = 1102H ; Load ROM 8x8 Character Set (EGA/VGA)
  4771                              <1> 	; case 0x02:
  4772                              <1>         ; case 0x12:
  4773                              <1>         ; biosfn_load_text_8_8_pat(GET_AL(),GET_BL());
  4774                              <1>         ; break;
  4775 00002AE0 3C02                <1> 	cmp	al, 2
  4776 00002AE2 7404                <1> 	je	short font_setup_4
  4777 00002AE4 3C12                <1> 	cmp	al, 12h
  4778 00002AE6 750A                <1> 	jne	short font_setup_5	
  4779                              <1> font_setup_4:
  4780                              <1> 	; AX = 1112H ; Load and Activate ROM 8x8 Character Set (EGA/VGA)
  4781                              <1> 	; (BL = font block to load (EGA: 0-3; VGA: 0-7))
  4782 00002AE8 E805020000          <1> 	call	load_text_8_8_pat
  4783 00002AED E96BEAFFFF          <1>         jmp     VIDEO_RETURN
  4784                              <1> font_setup_5:
  4785                              <1> 	; AX = 1104H ; Load ROM 8x16 Character Set (EGA/VGA)
  4786                              <1> 	; case 0x04:
  4787                              <1>         ; case 0x14:
  4788                              <1>         ; biosfn_load_text_8_16_pat(GET_AL(),GET_BL());
  4789                              <1>         ; break;
  4790 00002AF2 3C04                <1> 	cmp	al, 4
  4791 00002AF4 7404                <1> 	je	short font_setup_6
  4792 00002AF6 3C14                <1> 	cmp	al, 14h
  4793 00002AF8 750A                <1> 	jne	short font_setup_7	
  4794                              <1> font_setup_6:
  4795                              <1> 	; AX = 1114H ; Load and Activate ROM 8x16 Character Set (EGA/VGA)
  4796                              <1> 	; (BL = font block to load (EGA: 0-3; VGA: 0-7))
  4797 00002AFA E823020000          <1> 	call	load_text_8_16_pat
  4798 00002AFF E959EAFFFF          <1>         jmp     VIDEO_RETURN
  4799                              <1> font_setup_7:
  4800                              <1> 	; Note: AX=1120h (Setup INT 1Fh, EXT_PTR) is not needed
  4801                              <1> 	; for TRDOS 386 (TRDIOS v2.0) video functionality;
  4802                              <1> 	; because, originally EXT_PTR (font address) was used for
  4803                              <1> 	; chars 80h to 0FFh (after the first 128 ASCII char fonts), for
  4804                              <1> 	; CGA graphics mode; currenty, 'vgafont8' address has 256 chars!
  4805                              <1> 	; 
  4806                              <1> 	; case 0x20:
  4807                              <1>         ; biosfn_load_gfx_8_8_chars(ES,BP);
  4808                              <1>         ; break; 
  4809                              <1> 	; case 0x21:
  4810                              <1>         ; biosfn_load_gfx_user_chars(ES,BP,CX,GET_BL(),GET_DL());
  4811                              <1>         ; break;
  4812                              <1> 	; AX = 1121H ; Setup User-Defined Font for Graphics Mode (VGA)
  4813                              <1> 	; BL   screen rows code: 00H = user-specified (in DL)
  4814                              <1>         ;                        01H = 14 rows
  4815                              <1>         ;                        02H = 25 rows
  4816                              <1>         ;                        03H = 43 rows
  4817                              <1>         ; CX   bytes per character definition
  4818                              <1>         ; DL   (when BL=0) custom number of character rows on screen
  4819                              <1>         ; EBP  address of font-definition information (user's mem space)
  4820                              <1> 
  4821 00002B04 3C21                <1> 	cmp	al, 21h
  4822 00002B06 751A                <1> 	jne	short font_setup_9
  4823                              <1> 
  4824                              <1> 	; TRDOS 386 modification !
  4825                              <1> 	; dh = 0 -> 256 characters
  4826                              <1> 	; dh = 80h -> 128 characters
  4827                              <1> 	; (If DH <> 0 and DH <> 80h -> invalid)     
  4828 00002B08 20F6                <1> 	and	dh, dh
  4829 00002B0A 7405                <1> 	jz	short font_setup_8 ; 256 characters
  4830 00002B0C 80FE80              <1> 	cmp	dh, 80h ; 128 characters
  4831 00002B0F 75C8                <1> 	jne	short font_setup_error ; invalid !
  4832                              <1> font_setup_8:
  4833 00002B11 E85C000000          <1> 	call	transfer_user_fonts
  4834 00002B16 72C1                <1> 	jc	short font_setup_error
  4835                              <1> 	; ebp = user's font data address in system's memory space
  4836 00002B18 E836020000          <1> 	call	load_gfx_user_chars
  4837 00002B1D E93BEAFFFF          <1>         jmp     VIDEO_RETURN 
  4838                              <1> font_setup_9:
  4839                              <1> 	; case 0x22:
  4840                              <1>         ; biosfn_load_gfx_8_14_chars(GET_BL());
  4841                              <1>         ; break;
  4842 00002B22 3C22                <1> 	cmp	al, 22h
  4843 00002B24 750A                <1> 	jne	short font_setup_10
  4844 00002B26 E866020000          <1> 	call	load_gfx_8_14_chars	
  4845 00002B2B E92DEAFFFF          <1>         jmp     VIDEO_RETURN 
  4846                              <1> font_setup_10:	
  4847                              <1> 	; case 0x23:
  4848                              <1>         ; biosfn_load_gfx_8_8_dd_chars(GET_BL());
  4849                              <1>         ; break;
  4850 00002B30 3C23                <1> 	cmp	al, 23h
  4851 00002B32 750A                <1> 	jne	short font_setup_11
  4852 00002B34 E899020000          <1> 	call	load_gfx_8_8_chars	
  4853 00002B39 E91FEAFFFF          <1>         jmp     VIDEO_RETURN 
  4854                              <1> font_setup_11:	
  4855                              <1> 	; case 0x24:
  4856                              <1>         ; biosfn_load_gfx_8_16_chars(GET_BL());
  4857                              <1>         ; break;
  4858 00002B3E 3C24                <1> 	cmp	al, 24h
  4859 00002B40 750A                <1> 	jne	short font_setup_12
  4860 00002B42 E8CC020000          <1> 	call	load_gfx_8_16_chars	
  4861 00002B47 E911EAFFFF          <1>         jmp     VIDEO_RETURN 
  4862                              <1> font_setup_12:
  4863                              <1>  	; case 0x30:
  4864                              <1>         ; biosfn_get_font_info(GET_BH(),&ES,&BP,&CX,&DX);
  4865                              <1>         ; break;
  4866 00002B4C 3C30                <1> 	cmp	al, 30h
  4867 00002B4E 750A                <1> 	jne	short font_setup_13			
  4868 00002B50 E8FF020000          <1> 	call	get_font_info
  4869                              <1> 	; eax = return value (info: 4 bytes for 4 parms)
  4870                              <1> 	; eax = 0 -> invalid function (input)
  4871 00002B55 E908EAFFFF          <1>         jmp     _video_return
  4872                              <1> font_setup_13:
  4873 00002B5A 3C03                <1> 	cmp	al, 03h ; AX = 1103h	
  4874 00002B5C 750D                <1> 	jne	short font_setup_14
  4875                              <1> 	; biosfn_set_text_block_specifier:
  4876                              <1> 	; BL = font block selector code	
  4877                              <1> 	; NOTE: TRDOS 386 only uses and sets font block 0
  4878                              <1> 	; (It is as BL = 0 for TRDOS 386)
  4879 00002B5E 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  4880                              <1> 	;mov	ah, bl
  4881 00002B62 28E4                <1> 	sub	ah, ah ; 0
  4882                              <1> 	;mov	al, 03h
  4883 00002B64 66EF                <1> 	out	dx, ax
  4884 00002B66 E9F2E9FFFF          <1> 	jmp     VIDEO_RETURN 
  4885                              <1> 	
  4886                              <1> font_setup_14:
  4887 00002B6B 29C0                <1> 	sub	eax, eax ; 0 = invalid function
  4888 00002B6D E9F0E9FFFF          <1>         jmp     _video_return
  4889                              <1> 
  4890                              <1> transfer_user_fonts:
  4891                              <1> 	; 09/07/2016
  4892                              <1> 	;and	ecx, 0FFFFh
  4893                              <1> 	; ECX = byte count
  4894                              <1> 	;push	ecx
  4895 00002B72 89EE                <1> 	mov	esi, ebp ; user buffer
  4896 00002B74 BF00000700          <1> 	mov	edi, Cluster_Buffer  ; system buffer
  4897 00002B79 E8C9BC0000          <1> 	call	transfer_from_user_buffer
  4898                              <1> 	;pop	ecx
  4899                              <1> 	; ecx = transfer (byte) count = character count
  4900 00002B7E BD00000700          <1> 	mov	ebp, Cluster_Buffer
  4901                              <1> 	; jc	VIDEO_RETURN -> failed
  4902 00002B83 C3                  <1> 	retn
  4903                              <1> 
  4904                              <1> load_text_user_pat:
  4905                              <1> 	; 26/07/2016
  4906                              <1> 	; 09/07/2016
  4907                              <1> 	; load user defined (EGA/VGA) text fonts
  4908                              <1> 	;
  4909                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4910                              <1> 	; vgabios-0.7a (2011)
  4911                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4912                              <1> 	; 'vgabios.c', 'biosfn_load_text_user_pat'
  4913                              <1> 
  4914                              <1> 	; biosfn_load_text_user_pat (AL,ES,BP,CX,DX,BL,BH)
  4915                              <1> 
  4916                              <1> 	; get_font_access();
  4917                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  4918                              <1> 	; for(i=0;i<CX;i++)
  4919                              <1> 	; {
  4920                              <1> 	;  src = BP + i * BH;
  4921                              <1> 	;  dest = blockaddr + (DX + i) * 32;
  4922                              <1> 	;  memcpyb(0xA000, dest, ES, src, BH);
  4923                              <1> 	; }
  4924                              <1> 	; release_font_access();
  4925                              <1> 	; if(AL>=0x10)
  4926                              <1> 	; {
  4927                              <1> 	; set_scan_lines(BH);
  4928                              <1> 	; }
  4929                              <1> 
  4930 00002B84 50                  <1> 	push	eax
  4931 00002B85 E83C000000          <1> 	call	get_font_access
  4932 00002B8A 28DB                <1> 	sub	bl, bl ; i = 0	
  4933                              <1> ltup_1:
  4934 00002B8C 88D8                <1> 	mov	al, bl
  4935 00002B8E F6E7                <1> 	mul	bh
  4936 00002B90 0FB7F0              <1> 	movzx	esi, ax
  4937 00002B93 01EE                <1> 	add	esi, ebp
  4938 00002B95 88D8                <1> 	mov	al, bl
  4939 00002B97 28E4                <1> 	sub	ah, ah
  4940 00002B99 6601D0              <1> 	add	ax, dx ; (DX + i)
  4941 00002B9C 66C1E005            <1> 	shl	ax, 5  ; * 32
  4942 00002BA0 0FB7F8              <1> 	movzx	edi, ax
  4943 00002BA3 81C700000A00        <1> 	add	edi, 0A0000h
  4944 00002BA9 51                  <1> 	push	ecx
  4945 00002BAA 0FB6CF              <1> 	movzx	ecx, bh 		
  4946 00002BAD F3A4                <1> 	rep	movsb
  4947 00002BAF 59                  <1> 	pop	ecx	
  4948 00002BB0 FEC3                <1> 	inc	bl
  4949 00002BB2 38CB                <1> 	cmp	bl, cl
  4950 00002BB4 75D6                <1> 	jne	short ltup_1	
  4951                              <1> 	;
  4952 00002BB6 E840000000          <1> 	call	release_font_access
  4953                              <1> 	;
  4954 00002BBB 58                  <1> 	pop	eax
  4955                              <1> 	; if(AL>=0x10)
  4956 00002BBC 3C10                <1> 	cmp	al, 10h
  4957 00002BBE 7205                <1> 	jb	short ltup_2
  4958                              <1>    	; set_scan_lines(BH);
  4959 00002BC0 E875000000          <1> 	call	set_scan_lines
  4960                              <1> ltup_2:
  4961 00002BC5 C3                  <1> 	retn
  4962                              <1> 
  4963                              <1> get_font_access:
  4964                              <1> 	; 09/07/2016
  4965                              <1> 	;
  4966                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4967                              <1> 	; vgabios-0.7a (2011)
  4968                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4969                              <1> 	; 'vgabios.c', 'get_font_access'
  4970                              <1> 
  4971                              <1> 	; get_font_access()
  4972 00002BC6 52                  <1> 	push	edx
  4973 00002BC7 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  4974 00002BCB 66B80001            <1> 	mov	ax, 0100h
  4975 00002BCF 66EF                <1> 	out	dx, ax
  4976 00002BD1 66B80204            <1> 	mov	ax, 0402h
  4977 00002BD5 66EF                <1> 	out	dx, ax
  4978 00002BD7 66B80407            <1> 	mov	ax, 0704h
  4979 00002BDB 66EF                <1> 	out	dx, ax
  4980 00002BDD 66B80003            <1> 	mov	ax, 0300h
  4981 00002BE1 66EF                <1> 	out	dx, ax
  4982 00002BE3 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  4983 00002BE7 66B80402            <1> 	mov	ax, 0204h
  4984 00002BEB 66EF                <1> 	out	dx, ax
  4985 00002BED 66B80500            <1> 	mov	ax, 0005h
  4986 00002BF1 66EF                <1> 	out	dx, ax
  4987 00002BF3 66B80604            <1> 	mov	ax, 0406h
  4988 00002BF7 66EF                <1> 	out	dx, ax
  4989 00002BF9 5A                  <1> 	pop	edx
  4990 00002BFA C3                  <1> 	retn
  4991                              <1> 
  4992                              <1> release_font_access:
  4993                              <1> 	; 29/07/2016
  4994                              <1> 	; 09/07/2016
  4995                              <1> 	;
  4996                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  4997                              <1> 	; vgabios-0.7a (2011)
  4998                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  4999                              <1> 	; 'vgabios.c', 'release_font_access'
  5000                              <1> 
  5001 00002BFB 66BAC403            <1> 	mov	dx, 3C4h ; VGAREG_SEQU_ADDRESS
  5002 00002BFF 66B80001            <1> 	mov	ax, 0100h
  5003 00002C03 66EF                <1> 	out	dx, ax
  5004 00002C05 66B80203            <1> 	mov	ax, 0302h
  5005 00002C09 66EF                <1> 	out	dx, ax
  5006 00002C0B 66B80403            <1> 	mov	ax, 0304h
  5007 00002C0F 66EF                <1> 	out	dx, ax
  5008 00002C11 66B80003            <1> 	mov	ax, 0300h
  5009 00002C15 66EF                <1> 	out	dx, ax
  5010 00002C17 66BACC03            <1> 	mov	dx, 3CCh ; VGAREG_READ_MISC_OUTPUT
  5011 00002C1B EC                  <1>  	in	al, dx
  5012 00002C1C 2401                <1> 	and	al, 01h
  5013 00002C1E C0E002              <1> 	shl	al, 2
  5014 00002C21 0C0A                <1> 	or	al, 0Ah
  5015 00002C23 88C4                <1> 	mov	ah, al
  5016 00002C25 B006                <1> 	mov	al, 06h
  5017 00002C27 66BACE03            <1> 	mov	dx, 3CEh ; VGAREG_GRDC_ADDRESS
  5018 00002C2B 66EF                <1> 	out	dx, ax
  5019 00002C2D 66B80400            <1> 	mov	ax, 0004h
  5020 00002C31 66EF                <1> 	out	dx, ax
  5021 00002C33 66B80510            <1> 	mov	ax, 1005h
  5022 00002C37 66EF                <1> 	out	dx, ax
  5023 00002C39 C3                  <1> 	retn
  5024                              <1> 
  5025                              <1> set_scan_lines:
  5026                              <1> 	; 09/07/2016
  5027                              <1> 	;
  5028                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5029                              <1> 	; vgabios-0.7a (2011)
  5030                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5031                              <1> 	; 'vgabios.c', 'set_scan_lines'
  5032                              <1> 
  5033                              <1> 	; set_scan_lines(lines)
  5034                              <1> 	; BH = lines
  5035                              <1> 
  5036                              <1> 	; outb(crtc_addr, 0x09);
  5037 00002C3A 66BAD403            <1> 	mov	dx, 3D4h ; CRTC_ADDRESS = 3D4h (always)
  5038 00002C3E B009                <1> 	mov	al, 09h
  5039 00002C40 EE                  <1> 	out	dx, al
  5040                              <1> 	; crtc_r9 = inb(crtc_addr+1);
  5041 00002C41 6642                <1> 	inc	dx ; 3D5h
  5042 00002C43 EC                  <1> 	in	al, dx
  5043                              <1> 	; crtc_r9 = (crtc_r9 & 0xe0) | (lines - 1);
  5044 00002C44 24E0                <1> 	and	al, 0E0h
  5045 00002C46 FECF                <1> 	dec	bh ; lines - 1
  5046 00002C48 08F8                <1> 	or	al, bh
  5047                              <1> 	; outb(crtc_addr+1, crtc_r9);
  5048 00002C4A EE                  <1> 	out	dx, al
  5049                              <1> 	;inc	bh 
  5050                              <1> 	; if(lines==8)
  5051                              <1> 	;cmp	bh, 8
  5052 00002C4B 80FF07              <1> 	cmp	bh, 7
  5053 00002C4E 7506                <1> 	jne	short ssl_1
  5054                              <1> 	; biosfn_set_cursor_shape(0x06,0x07);
  5055 00002C50 66B90706            <1> 	mov	cx, 0607h
  5056 00002C54 EB06                <1> 	jmp	short ssl_2
  5057                              <1> ssl_1:
  5058                              <1> 	; biosfn_set_cursor_shape(lines-4,lines-3);
  5059 00002C56 88F9                <1> 	mov	cl, bh ; lines - 1
  5060 00002C58 88CD                <1> 	mov	ch, cl ; lines - 1 (16 -> 15)
  5061 00002C5A FECD                <1> 	dec	ch  ; lines - 2 (16 -> 14)
  5062                              <1> ssl_2:
  5063                              <1> 	; CH = start line, CL = stop line
  5064 00002C5C B40A                <1> 	mov	ah, 10	; 6845 register for cursor set
  5065 00002C5E 66890D[3B5F0000]    <1> 	mov	[CURSOR_MODE], cx ; save in data area
  5066 00002C65 E812F1FFFF          <1> 	call	m16	; output cx register
  5067                              <1> 	; write_word(BIOSMEM_SEG,BIOSMEM_CHAR_HEIGHT, lines);
  5068 00002C6A FEC7                <1> 	inc	bh ; lines
  5069 00002C6C 883D[265F0000]      <1> 	mov	[CHAR_HEIGHT], bh
  5070                              <1> 	;  outb(crtc_addr, 0x12);
  5071 00002C72 66BAD403            <1> 	mov	dx, 3D4h ; CRTC_ADDRESS
  5072 00002C76 B012                <1> 	mov	al, 12h
  5073 00002C78 EE                  <1> 	out	dx, al
  5074                              <1> 	; vde = inb(crtc_addr+1);
  5075 00002C79 6642                <1> 	inc	dx
  5076 00002C7B EC                  <1> 	in	al, dx
  5077 00002C7C 88C4                <1> 	mov	ah, al
  5078                              <1> 	; outb(crtc_addr, 0x07);
  5079 00002C7E 664A                <1> 	dec	dx
  5080 00002C80 B007                <1> 	mov	al, 07h
  5081 00002C82 EE                  <1> 	out	dx, al
  5082                              <1> 	; ovl = inb(crtc_addr+1);
  5083 00002C83 6642                <1> 	inc	dx
  5084 00002C85 EC                  <1> 	in	al, dx
  5085                              <1> 	; vde += (((ovl & 0x02) << 7) + ((ovl & 0x40) << 3) + 1);
  5086 00002C86 88E2                <1> 	mov	dl, ah ; vde
  5087 00002C88 88C6                <1> 	mov	dh, al ; ovl
  5088 00002C8A 6683E002            <1> 	and	ax, 02h
  5089 00002C8E 66C1E007            <1> 	shl	ax, 7
  5090 00002C92 6689C1              <1> 	mov	cx, ax ; (ovl & 0x02) << 7)	
  5091 00002C95 88F0                <1> 	mov	al, dh ; ovl
  5092 00002C97 6683E040            <1> 	and	ax, 40h			
  5093 00002C9B 66C1E003            <1> 	shl	ax, 3  ; (ovl & 0x40) << 3)
  5094 00002C9F 6640                <1> 	inc	ax ; + 1 
  5095 00002CA1 6601C8              <1> 	add	ax, cx
  5096 00002CA4 30F6                <1> 	xor	dh, dh
  5097 00002CA6 6601D0              <1> 	add	ax, dx ; + vde
  5098                              <1> 	; rows = vde / lines;
  5099 00002CA9 F6F7                <1> 	div	bh
  5100                              <1> 	;dec	al ; rows -1
  5101                              <1> 	; write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, rows-1);
  5102 00002CAB A2[2A5F0000]        <1> 	mov	[VGA_ROWS], al ; rows (not 'rows-1' !)
  5103                              <1> 	; write_word(BIOSMEM_SEG,BIOSMEM_PAGE_SIZE, rows * cols * 2);
  5104 00002CB0 8A25[245F0000]      <1> 	mov	ah, [CRT_COLS]
  5105 00002CB6 F6E4                <1> 	mul	ah
  5106 00002CB8 66D1E0              <1> 	shl	ax, 1
  5107 00002CBB 66A3[58650100]      <1> 	mov 	[CRT_LEN], ax	
  5108 00002CC1 C3                  <1> 	retn
  5109                              <1> 
  5110                              <1> load_text_8_14_pat:
  5111                              <1> 	; 26/07/2016
  5112                              <1> 	; 25/07/2016
  5113                              <1> 	; 23/07/2016
  5114                              <1> 	; 09/07/2016
  5115                              <1> 	; load user defined (EGA/VGA) text fonts
  5116                              <1> 	;
  5117                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5118                              <1> 	; vgabios-0.7a (2011)
  5119                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5120                              <1> 	; 'vgabios.c', 'biosfn_load_text_8_14_pat'
  5121                              <1> 
  5122                              <1> 	; biosfn_load_text_8_14_pat (AL,BL)
  5123                              <1> 
  5124                              <1> 	; get_font_access();
  5125                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  5126                              <1> 	; for(i=0;i<0x100;i++)
  5127                              <1> 	; {
  5128                              <1> 	;  src = i * 14;
  5129                              <1> 	;  dest = blockaddr + i * 32;
  5130                              <1> 	;  memcpyb(0xA000, dest, 0xC000, vgafont14+src, 14);
  5131                              <1> 	; }
  5132                              <1> 	; release_font_access();
  5133                              <1> 	; if(AL>=0x10)
  5134                              <1> 	; {
  5135                              <1> 	; set_scan_lines(14);
  5136                              <1> 	; }
  5137                              <1> 
  5138 00002CC2 50                  <1> 	push	eax
  5139 00002CC3 E8FEFEFFFF          <1> 	call	get_font_access
  5140                              <1> 
  5141                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  5142                              <1> 	;mov	dl, bl
  5143                              <1> 	;and	dl, 3
  5144                              <1> 	;shl	dx, 14
  5145                              <1> 	;xchg	dx, bx
  5146                              <1> 	;and	dl, 4
  5147                              <1> 	;shl	dx, 11
  5148                              <1> 	;add	dx, bx 	
  5149                              <1>  
  5150                              <1> 	;xor	dx, dx  ; blockaddr = 0
  5151                              <1> 	; Always block 0 for TRDOS 386 ! (blockaddr=0(
  5152                              <1> 
  5153 00002CC8 28DB                <1> 	sub	bl, bl ; i = 0
  5154 00002CCA B70E                <1> 	mov	bh, 14
  5155 00002CCC BE[3C350100]        <1> 	mov	esi, vgafont14
  5156 00002CD1 BF00000A00          <1> 	mov	edi, 0A0000h		
  5157                              <1> lt8_14_1:
  5158                              <1> 	;mov	al, bl
  5159                              <1> 	;mul	bh
  5160                              <1> 	;movzx	esi, ax
  5161                              <1> 	;add	esi, vgafont14
  5162                              <1> 	;mov	al, bl
  5163                              <1> 	;sub	ah, ah
  5164                              <1> 	;shl	ax, 5 ; * 32
  5165                              <1> 	;;add	ax, dx ; blockaddr + i * 32;
  5166                              <1> 	;movzx	edi, ax ; dest
  5167                              <1> 	;add	edi, 0A0000h
  5168 00002CD6 0FB6CF              <1> 	movzx	ecx, bh 		
  5169 00002CD9 F3A4                <1> 	rep	movsb
  5170 00002CDB 83C712              <1> 	add	edi, 18 ; 32 - 14
  5171 00002CDE FEC3                <1> 	inc	bl
  5172 00002CE0 75F4                <1> 	jnz	short lt8_14_1	
  5173                              <1> 	;
  5174 00002CE2 E814FFFFFF          <1> 	call	release_font_access
  5175                              <1> 	;
  5176 00002CE7 58                  <1> 	pop	eax
  5177                              <1> 	; if(AL>=0x10)
  5178 00002CE8 3C10                <1> 	cmp	al, 10h
  5179 00002CEA 7205                <1> 	jb	short lt8_14_4
  5180                              <1> 	; BH = 14
  5181                              <1>    	; set_scan_lines(14);
  5182 00002CEC E849FFFFFF          <1> 	call	set_scan_lines
  5183                              <1> lt8_14_4:
  5184 00002CF1 C3                  <1> 	retn
  5185                              <1> 
  5186                              <1> load_text_8_8_pat:
  5187                              <1> 	; 26/07/2016
  5188                              <1> 	; 25/07/2016
  5189                              <1> 	; 23/07/2016
  5190                              <1> 	; 09/07/2016
  5191                              <1> 	; load user defined (EGA/VGA) text fonts
  5192                              <1> 	;
  5193                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5194                              <1> 	; vgabios-0.7a (2011)
  5195                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5196                              <1> 	; 'vgabios.c', 'biosfn_load_text_8_8_pat'
  5197                              <1> 
  5198                              <1> 	; biosfn_load_text_8_8_pat (AL,BL)
  5199                              <1> 
  5200                              <1> 	; get_font_access();
  5201                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  5202                              <1> 	; for(i=0;i<0x100;i++)
  5203                              <1> 	; {
  5204                              <1> 	;  src = i * 8;
  5205                              <1> 	;  dest = blockaddr + i * 32;
  5206                              <1> 	;  memcpyb(0xA000, dest, 0xC000, vgafont8+src, 8);
  5207                              <1> 	; }
  5208                              <1> 	; release_font_access();
  5209                              <1> 	; if(AL>=0x10)
  5210                              <1> 	; {
  5211                              <1> 	; set_scan_lines(8);
  5212                              <1> 	; }
  5213                              <1> 
  5214 00002CF2 50                  <1> 	push	eax
  5215 00002CF3 E8CEFEFFFF          <1> 	call	get_font_access
  5216                              <1> 
  5217                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  5218                              <1> 	;mov	dl, bl
  5219                              <1> 	;and	dl, 3
  5220                              <1> 	;shl	dx, 14
  5221                              <1> 	;xchg	dx, bx
  5222                              <1> 	;and	dl, 4
  5223                              <1> 	;shl	dx, 11
  5224                              <1> 	;add	dx, bx 	
  5225                              <1>  
  5226                              <1> 	;xor	dx, dx  ; blockaddr = 0
  5227                              <1> 	; Always block 0 for TRDOS 386 ! (blockaddr=0(
  5228                              <1> 
  5229 00002CF8 28DB                <1> 	sub	bl, bl ; i = 0
  5230 00002CFA B708                <1> 	mov	bh, 8
  5231 00002CFC BE[3C2D0100]        <1> 	mov	esi, vgafont8
  5232 00002D01 BF00000A00          <1> 	mov	edi, 0A0000h		
  5233                              <1> lt8_8_1:
  5234                              <1> 	;mov	al, bl
  5235                              <1> 	;mul	bh
  5236                              <1> 	;movzx	esi, ax
  5237                              <1> 	;add	esi, vgafont8
  5238                              <1> 	;mov	al, bl
  5239                              <1> 	;sub	ah, ah
  5240                              <1> 	;shl	ax, 5 ; * 32
  5241                              <1> 	;;add	ax, dx ; blockaddr + i * 32;
  5242                              <1> 	;movzx	edi, ax ; dest
  5243                              <1> 	;add	edi, 0A0000h
  5244 00002D06 0FB6CF              <1> 	movzx	ecx, bh 		
  5245 00002D09 F3A4                <1> 	rep	movsb
  5246 00002D0B 83C718              <1> 	add	edi, 24 ; 32 - 8
  5247 00002D0E FEC3                <1> 	inc	bl
  5248 00002D10 75F4                <1> 	jnz	short lt8_8_1	
  5249                              <1> 	;
  5250 00002D12 E8E4FEFFFF          <1> 	call	release_font_access
  5251                              <1> 	;
  5252 00002D17 58                  <1> 	pop	eax
  5253                              <1> 	; if(AL>=0x10)
  5254 00002D18 3C10                <1> 	cmp	al, 10h
  5255 00002D1A 7205                <1> 	jb	short lt8_8_2
  5256                              <1> 	; BH = 8
  5257                              <1>    	; set_scan_lines(8);
  5258 00002D1C E819FFFFFF          <1> 	call	set_scan_lines
  5259                              <1> lt8_8_2:
  5260 00002D21 C3                  <1> 	retn
  5261                              <1> 
  5262                              <1> load_text_8_16_pat:
  5263                              <1> 	; 26/07/2016
  5264                              <1> 	; 25/07/2016
  5265                              <1> 	; 23/07/2016
  5266                              <1> 	; 09/07/2016
  5267                              <1> 	; load user defined (EGA/VGA) text fonts
  5268                              <1> 	;
  5269                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5270                              <1> 	; vgabios-0.7a (2011)
  5271                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5272                              <1> 	; 'vgabios.c', 'biosfn_load_text_8_16_pat'
  5273                              <1> 
  5274                              <1> 	; biosfn_load_text_8_16_pat (AL,BL)
  5275                              <1> 
  5276                              <1> 	; get_font_access();
  5277                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  5278                              <1> 	; for(i=0;i<0x100;i++)
  5279                              <1> 	; {
  5280                              <1> 	;  src = i * 16;
  5281                              <1> 	;  dest = blockaddr + i * 32;
  5282                              <1> 	;  memcpyb(0xA000, dest, 0xC000, vgafont16+src, 16);
  5283                              <1> 	; }
  5284                              <1> 	; release_font_access();
  5285                              <1> 	; if(AL>=0x10)
  5286                              <1> 	; {
  5287                              <1> 	; set_scan_lines(16);
  5288                              <1> 	; }
  5289                              <1> 
  5290 00002D22 50                  <1> 	push	eax
  5291 00002D23 E89EFEFFFF          <1> 	call	get_font_access
  5292                              <1> 
  5293                              <1> 	; blockaddr = ((BL & 0x03) << 14) + ((BL & 0x04) << 11);
  5294                              <1> 	;mov	dl, bl
  5295                              <1> 	;and	dl, 3
  5296                              <1> 	;shl	dx, 14
  5297                              <1> 	;xchg	dx, bx
  5298                              <1> 	;and	dl, 4
  5299                              <1> 	;shl	dx, 11
  5300                              <1> 	;add	dx, bx 	
  5301                              <1>  
  5302                              <1> 	;xor	dx, dx  ; blockaddr = 0
  5303                              <1> 	; Always block 0 for TRDOS 386 ! (blockaddr=0(
  5304                              <1> 
  5305 00002D28 28DB                <1> 	sub	bl, bl ; i = 0
  5306 00002D2A B710                <1> 	mov	bh, 16
  5307 00002D2C BE[3C430100]        <1> 	mov	esi, vgafont16
  5308 00002D31 BF00000A00          <1> 	mov	edi, 0A0000h
  5309 00002D36 0FB6C7              <1> 	movzx	eax, bh	
  5310                              <1> lt8_16_1:
  5311                              <1> 	;mov	al, bl
  5312                              <1> 	;mul	bh
  5313                              <1> 	;movzx	esi, ax
  5314                              <1> 	;add	esi, vgafont16
  5315                              <1> 	;mov	al, bl ; i
  5316                              <1> 	;sub	ah, ah
  5317                              <1> 	;shl	ax, 5 ; * 32
  5318                              <1> 	;;add	ax, dx ; blockaddr + i * 32;
  5319                              <1> 	;movzx	edi, ax ; dest
  5320                              <1> 	;add	edi, 0A0000h
  5321                              <1> 	;movzx	ecx, bh
  5322 00002D39 89C1                <1> 	mov	ecx, eax ; 16	
  5323 00002D3B F3A4                <1> 	rep	movsb
  5324 00002D3D 01C7                <1> 	add	edi, eax ; add edi, 16
  5325 00002D3F FEC3                <1> 	inc	bl
  5326 00002D41 75F6                <1> 	jnz	short lt8_16_1
  5327                              <1> 	;
  5328 00002D43 E8B3FEFFFF          <1> 	call	release_font_access
  5329                              <1> 	;
  5330 00002D48 58                  <1> 	pop	eax
  5331                              <1> 	; if(AL>=0x10)
  5332 00002D49 3C10                <1> 	cmp	al, 10h
  5333 00002D4B 7205                <1> 	jb	short lt8_16_2
  5334                              <1> 	; BH = 16
  5335                              <1>    	; set_scan_lines(16);
  5336 00002D4D E8E8FEFFFF          <1> 	call	set_scan_lines
  5337                              <1> lt8_16_2:
  5338 00002D52 C3                  <1> 	retn
  5339                              <1> 
  5340                              <1> load_gfx_user_chars:
  5341                              <1> 	; 08/08/2016
  5342                              <1> 	; 10/07/2016
  5343                              <1> 	; Setup User-Defined Font for Graphics Mode (VGA)
  5344                              <1> 	;
  5345                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5346                              <1> 	; vgabios-0.7a (2011)
  5347                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5348                              <1> 	; 'vgabios.c', 'biosfn_load_gfx_user_chars'
  5349                              <1> 
  5350                              <1> 	; biosfn_load_gfx_user_chars (ES,BP,CX,BL,DL)
  5351                              <1> 	; /* set 0x43 INT pointer */
  5352                              <1>     	; write_word(0x0, 0x43*4, BP);
  5353                              <1>     	; write_word(0x0, 0x43*4+2, ES);
  5354 00002D53 31C0                <1> 	xor	eax, eax
  5355 00002D55 48                  <1> 	dec	eax ; 0FFFFFFFFh (user defined fonts)
  5356 00002D56 A3[6A650100]        <1> 	mov	[VGA_INT43H], eax
  5357                              <1> 		
  5358                              <1> 	; BL   screen rows code: 00H = user-specified (in DL)
  5359                              <1>         ;                        01H = 14 rows
  5360                              <1>         ;                        02H = 25 rows
  5361                              <1>         ;                        03H = 43 rows
  5362                              <1>         ; CX   bytes per character definition
  5363                              <1>         ; DL   (when BL=0) custom number of character rows on screen
  5364                              <1> 	; dh = 0 -> 256 characters
  5365                              <1> 	; dh = 80h -> 128 characters
  5366                              <1> 	; (If DH <> 0 and DH <> 80h -> invalid)     	 
  5367                              <1>         ; EBP  address of font-definition information (user's mem space)
  5368                              <1> 
  5369                              <1> 	; switch (BL) {
  5370                              <1> 	; case 0:
  5371                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, DL-1);
  5372                              <1> 	;    break;
  5373 00002D5B 20DB                <1> 	and	bl, bl
  5374 00002D5D 7508                <1> 	jnz	short l_gfx_uc_1
  5375 00002D5F 8815[2A5F0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  5376 00002D65 EB23                <1> 	jmp	short l_gfx_uc_4 	
  5377                              <1> l_gfx_uc_1:
  5378                              <1> 	; case 1:
  5379                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 13);
  5380                              <1> 	;    break;
  5381 00002D67 FECB                <1> 	dec	bl
  5382 00002D69 7509                <1> 	jnz	short l_gfx_uc_2
  5383                              <1> 	; bl = 1
  5384 00002D6B C605[2A5F0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  5385 00002D72 EB16                <1> 	jmp	short l_gfx_uc_4 	
  5386                              <1> l_gfx_uc_2:
  5387 00002D74 FECB                <1> 	dec	bl
  5388 00002D76 740B                <1> 	jz	short l_gfx_uc_3 ; bl = 2
  5389 00002D78 FECB                <1> 	dec	bl
  5390 00002D7A 750E                <1> 	jnz	short l_gfx_uc_4 ; bl > 3
  5391                              <1> 	; bl = 3
  5392                              <1> 	; case 3:
  5393                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 42);
  5394                              <1> 	;    break;
  5395 00002D7C C605[2A5F0000]2B    <1> 	mov	byte [VGA_ROWS], 43  ; not 42 !
  5396                              <1> l_gfx_uc_3:
  5397                              <1>     	; case 2:
  5398                              <1>     	; default:
  5399                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 24);
  5400                              <1> 	;    break;
  5401                              <1> 	; bl = 2 or bl > 3
  5402 00002D83 C605[2A5F0000]19    <1> 	mov	byte [VGA_ROWS], 25  ; not 24 !	
  5403                              <1>     	; }
  5404                              <1> l_gfx_uc_4:
  5405                              <1>     	; write_byte(BIOSMEM_SEG, BIOSMEM_CHAR_HEIGHT, CX);
  5406 00002D8A 880D[265F0000]      <1> 	mov	[CHAR_HEIGHT], cl
  5407                              <1> 	; }
  5408 00002D90 C3                  <1> 	retn	
  5409                              <1> 
  5410                              <1> load_gfx_8_14_chars:
  5411                              <1> 	; 08/08/2016
  5412                              <1> 	; 10/07/2016
  5413                              <1> 	; Setup ROM 8x14 Font for Graphics Mode (VGA)
  5414                              <1> 	;
  5415                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5416                              <1> 	; vgabios-0.7a (2011)
  5417                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5418                              <1> 	; 'vgabios.c', 'biosfn_load_gfx_8_14_chars'
  5419                              <1> 
  5420                              <1> 	; biosfn_load_gfx_8_14_chars (BL)
  5421                              <1> 	; /* set 0x43 INT pointer */
  5422                              <1>     	; write_word(0x0, 0x43*4, &vgafont14);
  5423                              <1>     	; write_word(0x0, 0x43*4+2, 0xC000);
  5424 00002D91 C705[6A650100]-     <1> 	mov	dword [VGA_INT43H], vgafont14
  5424 00002D97 [3C350100]          <1>
  5425                              <1> 		
  5426                              <1> 	; BL    screen rows code: 00H = user-specified (in DL)
  5427                              <1>         ;                         01H = 14 rows
  5428                              <1>         ;                         02H = 25 rows
  5429                              <1>         ;                         03H = 43 rows
  5430                              <1>         ; DL    (when BL=0) custom number of char rows on screen
  5431                              <1> 
  5432                              <1> 	; switch (BL) {
  5433                              <1> 	; case 0:
  5434                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, DL-1);
  5435                              <1> 	;    break;
  5436 00002D9B 20DB                <1> 	and	bl, bl
  5437 00002D9D 7508                <1> 	jnz	short l_gfx_8_14c_1
  5438 00002D9F 8815[2A5F0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  5439 00002DA5 EB23                <1> 	jmp	short l_gfx_8_14c_4 	
  5440                              <1> l_gfx_8_14c_1:
  5441                              <1> 	; case 1:
  5442                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 13);
  5443                              <1> 	;    break;
  5444 00002DA7 FECB                <1> 	dec	bl
  5445 00002DA9 7509                <1> 	jnz	short l_gfx_8_14c_2
  5446                              <1> 	; bl = 1
  5447 00002DAB C605[2A5F0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  5448 00002DB2 EB16                <1> 	jmp	short l_gfx_8_14c_4 	
  5449                              <1> l_gfx_8_14c_2:
  5450 00002DB4 FECB                <1> 	dec	bl
  5451 00002DB6 740B                <1> 	jz	short l_gfx_8_14c_3 ; bl = 2
  5452 00002DB8 FECB                <1> 	dec	bl
  5453 00002DBA 750E                <1> 	jnz	short l_gfx_8_14c_4 ; bl > 3
  5454                              <1> 	; bl = 3
  5455                              <1> 	; case 3:
  5456                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 42);
  5457                              <1> 	;    break;
  5458 00002DBC C605[2A5F0000]2B    <1> 	mov	byte [VGA_ROWS], 43  ; not 42 !
  5459                              <1> l_gfx_8_14c_3:
  5460                              <1>     	; case 2:
  5461                              <1>     	; default:
  5462                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 24);
  5463                              <1> 	;    break;
  5464                              <1> 	; bl = 2 or bl > 3
  5465 00002DC3 C605[2A5F0000]19    <1> 	mov	byte [VGA_ROWS], 25  ; not 24 !	
  5466                              <1>     	; }
  5467                              <1> l_gfx_8_14c_4:
  5468                              <1>     	; write_byte(BIOSMEM_SEG, BIOSMEM_CHAR_HEIGHT, 14);
  5469 00002DCA C605[265F0000]0E    <1>         mov     byte [CHAR_HEIGHT], 14
  5470                              <1> 	; }
  5471 00002DD1 C3                  <1> 	retn	
  5472                              <1> 
  5473                              <1> load_gfx_8_8_chars:
  5474                              <1> 	; 08/08/2016
  5475                              <1> 	; 10/07/2016
  5476                              <1> 	; Setup ROM 8x14 Font for Graphics Mode (VGA)
  5477                              <1> 	;
  5478                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5479                              <1> 	; vgabios-0.7a (2011)
  5480                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5481                              <1> 	; 'vgabios.c', 'biosfn_load_gfx_8_8_dd_chars'
  5482                              <1> 
  5483                              <1> 	; biosfn_load_gfx_8_8_dd_chars (BL)
  5484                              <1> 	; /* set 0x43 INT pointer */
  5485                              <1>     	; write_word(0x0, 0x43*4, &vgafont8);
  5486                              <1>     	; write_word(0x0, 0x43*4+2, 0xC000);
  5487 00002DD2 C705[6A650100]-     <1> 	mov	dword [VGA_INT43H], vgafont8
  5487 00002DD8 [3C2D0100]          <1>
  5488                              <1> 		
  5489                              <1> 	; BL    screen rows code: 00H = user-specified (in DL)
  5490                              <1>         ;                         01H = 14 rows
  5491                              <1>         ;                         02H = 25 rows
  5492                              <1>         ;                         03H = 43 rows
  5493                              <1>         ; DL    (when BL=0) custom number of char rows on screen
  5494                              <1> 
  5495                              <1> 	; switch (BL) {
  5496                              <1> 	; case 0:
  5497                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, DL-1);
  5498                              <1> 	;    break;
  5499 00002DDC 20DB                <1> 	and	bl, bl
  5500 00002DDE 7508                <1> 	jnz	short l_gfx_8_8c_1
  5501 00002DE0 8815[2A5F0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  5502 00002DE6 EB23                <1> 	jmp	short l_gfx_8_8c_4 	
  5503                              <1> l_gfx_8_8c_1:
  5504                              <1> 	; case 1:
  5505                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 13);
  5506                              <1> 	;    break;
  5507 00002DE8 FECB                <1> 	dec	bl
  5508 00002DEA 7509                <1> 	jnz	short l_gfx_8_8c_2
  5509                              <1> 	; bl = 1
  5510 00002DEC C605[2A5F0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  5511 00002DF3 EB16                <1> 	jmp	short l_gfx_8_8c_4 	
  5512                              <1> l_gfx_8_8c_2:
  5513 00002DF5 FECB                <1> 	dec	bl
  5514 00002DF7 740B                <1> 	jz	short l_gfx_8_8c_3 ; bl = 2
  5515 00002DF9 FECB                <1> 	dec	bl
  5516 00002DFB 750E                <1> 	jnz	short l_gfx_8_8c_4 ; bl > 3
  5517                              <1> 	; bl = 3
  5518                              <1> 	; case 3:
  5519                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 42);
  5520                              <1> 	;    break;
  5521 00002DFD C605[2A5F0000]2B    <1> 	mov	byte [VGA_ROWS], 43  ; not 42 !
  5522                              <1> l_gfx_8_8c_3:
  5523                              <1>     	; case 2:
  5524                              <1>     	; default:
  5525                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 24);
  5526                              <1> 	;    break;
  5527                              <1> 	; bl = 2 or bl > 3
  5528 00002E04 C605[2A5F0000]19    <1> 	mov	byte [VGA_ROWS], 25  ; not 24 !	
  5529                              <1>     	; }
  5530                              <1> l_gfx_8_8c_4:
  5531                              <1>     	; write_byte(BIOSMEM_SEG, BIOSMEM_CHAR_HEIGHT, 8);
  5532 00002E0B C605[265F0000]08    <1>         mov     byte [CHAR_HEIGHT], 8
  5533                              <1> 	; }
  5534 00002E12 C3                  <1> 	retn
  5535                              <1> 
  5536                              <1> load_gfx_8_16_chars:
  5537                              <1> 	; 08/08/2016
  5538                              <1> 	; 10/07/2016
  5539                              <1> 	; Setup ROM 8x14 Font for Graphics Mode (VGA)
  5540                              <1> 	;
  5541                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5542                              <1> 	; vgabios-0.7a (2011)
  5543                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5544                              <1> 	; 'vgabios.c', 'biosfn_load_gfx_8_16_chars'
  5545                              <1> 
  5546                              <1> 	; biosfn_load_gfx_8_16_chars (BL)
  5547                              <1> 	; /* set 0x43 INT pointer */
  5548                              <1>     	; write_word(0x0, 0x43*4, &vgafont16);
  5549                              <1>     	; write_word(0x0, 0x43*4+2, 0xC000);
  5550 00002E13 C705[6A650100]-     <1> 	mov	dword [VGA_INT43H], vgafont16
  5550 00002E19 [3C430100]          <1>
  5551                              <1> 		
  5552                              <1> 	; BL    screen rows code: 00H = user-specified (in DL)
  5553                              <1>         ;                         01H = 14 rows
  5554                              <1>         ;                         02H = 25 rows
  5555                              <1>         ;                         03H = 43 rows
  5556                              <1>         ; DL    (when BL=0) custom number of char rows on screen
  5557                              <1> 
  5558                              <1> 	; switch (BL) {
  5559                              <1> 	; case 0:
  5560                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, DL-1);
  5561                              <1> 	;    break;
  5562 00002E1D 20DB                <1> 	and	bl, bl
  5563 00002E1F 7508                <1> 	jnz	short l_gfx_8_16c_1
  5564 00002E21 8815[2A5F0000]      <1> 	mov	[VGA_ROWS], dl  ; not DL-1 !
  5565 00002E27 EB23                <1> 	jmp	short l_gfx_8_16c_4 	
  5566                              <1> l_gfx_8_16c_1:
  5567                              <1> 	; case 1:
  5568                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 13);
  5569                              <1> 	;    break;
  5570 00002E29 FECB                <1> 	dec	bl
  5571 00002E2B 7509                <1> 	jnz	short l_gfx_8_16c_2
  5572                              <1> 	; bl = 1
  5573 00002E2D C605[2A5F0000]0E    <1> 	mov	byte [VGA_ROWS], 14  ; not 13 !
  5574 00002E34 EB16                <1> 	jmp	short l_gfx_8_16c_4 	
  5575                              <1> l_gfx_8_16c_2:
  5576 00002E36 FECB                <1> 	dec	bl
  5577 00002E38 740B                <1> 	jz	short l_gfx_8_16c_3 ; bl = 2
  5578 00002E3A FECB                <1> 	dec	bl
  5579 00002E3C 750E                <1> 	jnz	short l_gfx_8_16c_4 ; bl > 3
  5580                              <1> 	; bl = 3
  5581                              <1> 	; case 3:
  5582                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 42);
  5583                              <1> 	;    break;
  5584 00002E3E C605[2A5F0000]2B    <1> 	mov	byte [VGA_ROWS], 43  ; not 42 !
  5585                              <1> l_gfx_8_16c_3:
  5586                              <1>     	; case 2:
  5587                              <1>     	; default:
  5588                              <1> 	;    write_byte(BIOSMEM_SEG,BIOSMEM_NB_ROWS, 24);
  5589                              <1> 	;    break;
  5590                              <1> 	; bl = 2 or bl > 3
  5591 00002E45 C605[2A5F0000]19    <1> 	mov	byte [VGA_ROWS], 25  ; not 24 !	
  5592                              <1>     	; }
  5593                              <1> l_gfx_8_16c_4:
  5594                              <1>     	; write_byte(BIOSMEM_SEG, BIOSMEM_CHAR_HEIGHT, 16);
  5595 00002E4C C605[265F0000]10    <1>         mov     byte [CHAR_HEIGHT], 16
  5596                              <1> 	; }
  5597 00002E53 C3                  <1> 	retn
  5598                              <1> 			
  5599                              <1> get_font_info:
  5600                              <1> 	; 19/09/2016
  5601                              <1> 	; 08/08/2016
  5602                              <1> 	; 10/07/2016
  5603                              <1> 	; Get Current Character Generator Info (VGA)
  5604                              <1> 	;
  5605                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5606                              <1> 	; vgabios-0.7a (2011)
  5607                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5608                              <1> 	; 'vgabios.c', 'biosfn_get_font_info'
  5609                              <1> 
  5610                              <1> 	; Modified for TRDOS 386 !
  5611                              <1> 	;
  5612                              <1> 	; INPUT ->
  5613                              <1> 	;    AX = 1130h
  5614                              <1> 	;    BL = 0 -> Get info for current VGA font
  5615                              <1> 	;	       (BH = unused)
  5616                              <1> 	;    19/09/2016
  5617                              <1> 	;    BL > 0 -> Get requested character font data
  5618                              <1> 	;	 BL = 1 -> vgafont8
  5619                              <1> 	;        BL = 2 -> vgafont14
  5620                              <1> 	;	 BL = 3 -> vgafont16   
  5621                              <1> 	;	 BL > 3 -> Invalid function (for now!)
  5622                              <1> 	;	 BH = ASCII code of the first character
  5623                              <1> 	;	 ECX = Number of characters from the 1st char
  5624                              <1> 	;	 ECX >= 256 -> All (256-BH) characters
  5625                              <1> 	;	 ECX = 0 -> All characters (BH = unused)	
  5626                              <1> 	;        EDX = User's Buffer Address	
  5627                              <1> 	; OUTPUT ->
  5628                              <1> 	;    AL = height (scanlines), bytes per character
  5629                              <1> 	;    AH = screen rows
  5630                              <1> 	;    Byte 16-23 of EAX = number of columns
  5631                              <1> 	;    Byte 24-31 of EAX = 
  5632                              <1> 	;	  0 -> default font (not configured yet)
  5633                              <1> 	;	  0FFh -> user defined font
  5634                              <1> 	;	  14 = vgafont14
  5635                              <1> 	;	   8 = vgafont8
  5636                              <1> 	;	  16 = vgafont16
  5637                              <1> 	;   If BL input > 0 -> 
  5638                              <1> 	;       EAX = Actual transfer count
  5639                              <1> 	;
  5640 00002E54 20DB                <1> 	and	bl, bl
  5641 00002E56 7408                <1> 	jz	short gfi_0
  5642                              <1> 	; invalid function (input)
  5643 00002E58 80FB03              <1> 	cmp	bl, 3
  5644 00002E5B 7642                <1> 	jna	short gfi_4
  5645 00002E5D 31C0                <1> 	xor	eax, eax ; 0
  5646 00002E5F C3                  <1> 	retn
  5647                              <1> gfi_0:
  5648 00002E60 A0[265F0000]        <1> 	mov	al, [CHAR_HEIGHT]
  5649 00002E65 8A25[2A5F0000]      <1> 	mov	ah, [VGA_ROWS]
  5650 00002E6B C1E010              <1> 	shl	eax, 16
  5651 00002E6E A0[245F0000]        <1> 	mov	al, [CRT_COLS]
  5652 00002E73 8B0D[6A650100]      <1> 	mov	ecx, [VGA_INT43H]
  5653 00002E79 21C9                <1> 	and	ecx, ecx
  5654 00002E7B 741E                <1> 	jz	short gfi_2 ; 0 = default font
  5655 00002E7D 41                  <1> 	inc	ecx ; 0FFFFFFFFh -> 0 (user defined font)
  5656 00002E7E 7504                <1> 	jnz	short gfi_1
  5657 00002E80 FECC                <1> 	dec	ah ; 0FFh
  5658 00002E82 EB17                <1> 	jmp	short gfi_2
  5659                              <1> gfi_1:
  5660 00002E84 49                  <1> 	dec	ecx ; 08/08/2016
  5661 00002E85 B40E                <1> 	mov	ah, 14
  5662 00002E87 81F9[3C350100]      <1> 	cmp	ecx, vgafont14
  5663 00002E8D 740C                <1> 	je	short gfi_2
  5664 00002E8F B408                <1> 	mov	ah, 8
  5665 00002E91 81F9[3C2D0100]      <1> 	cmp	ecx, vgafont8
  5666 00002E97 7402                <1> 	je	short gfi_2
  5667                              <1> 	; vgafont16
  5668 00002E99 D0E4                <1> 	shl	ah, 1 ; ah = 16
  5669                              <1> gfi_2:
  5670 00002E9B C1C010              <1> 	rol	eax, 16
  5671                              <1> gfi_3:
  5672 00002E9E C3                  <1> 	retn
  5673                              <1> gfi_4:
  5674 00002E9F 89D7                <1> 	mov	edi, edx ; **
  5675 00002EA1 80FB02              <1> 	cmp	bl, 2
  5676 00002EA4 720B                <1> 	jb	short gfi_5
  5677 00002EA6 772F                <1> 	ja	short gfi_7
  5678                              <1> 	;BL = 2 -> vgafont14
  5679 00002EA8 BE[3C350100]        <1> 	mov	esi, vgafont14 ; *
  5680 00002EAD B30E                <1> 	mov	bl, 14
  5681 00002EAF EB07                <1> 	jmp	short gfi_6 
  5682                              <1> gfi_5:
  5683                              <1> 	;BL = 1 -> vgafont8
  5684 00002EB1 BE[3C2D0100]        <1> 	mov	esi, vgafont8 ; *
  5685 00002EB6 B308                <1> 	mov	bl, 8
  5686                              <1> gfi_6:
  5687 00002EB8 09C9                <1> 	or	ecx, ecx
  5688 00002EBA 7424                <1> 	jz	short gfi_8 ; all chars from the 00h
  5689 00002EBC 88F8                <1> 	mov	al, bh ; character index
  5690 00002EBE F6E3                <1> 	mul	bl ; char index * char height/size
  5691 00002EC0 0FB7D0              <1> 	movzx	edx, ax
  5692 00002EC3 01D6                <1> 	add	esi, edx ; *
  5693 00002EC5 66BAFF00            <1> 	mov	dx, 255
  5694 00002EC9 28FA                <1> 	sub	dl, bh
  5695 00002ECB 6642                <1> 	inc	dx	
  5696 00002ECD 39D1                <1> 	cmp	ecx, edx
  5697 00002ECF 770F                <1> 	ja	short gfi_8
  5698 00002ED1 7412                <1> 	je	short gfi_9
  5699 00002ED3 89D1                <1> 	mov	ecx, edx
  5700 00002ED5 EB0E                <1> 	jmp	short gfi_9
  5701                              <1> gfi_7:
  5702                              <1> 	;BL = 3 -> vgafont16
  5703 00002ED7 BE[3C430100]        <1> 	mov	esi, vgafont16 ; *
  5704 00002EDC B310                <1> 	mov	bl, 16
  5705 00002EDE EBD8                <1> 	jmp	short gfi_6
  5706                              <1> gfi_8:
  5707 00002EE0 B900010000          <1> 	mov	ecx, 256
  5708                              <1> gfi_9:
  5709 00002EE5 6689C8              <1> 	mov	ax, cx ; character count
  5710 00002EE8 30FF                <1> 	xor	bh, bh
  5711 00002EEA 66F7E3              <1> 	mul	bx ; char count * char height/size	
  5712 00002EED 6689C1              <1>  	mov	cx, ax
  5713                              <1> 
  5714                              <1> 	; ESI = source address in system space
  5715                              <1> 	; EDI = user's buffer address
  5716                              <1> 	; ECX = transfer (byte) count
  5717 00002EF0 E808B90000          <1> 	call	transfer_to_user_buffer
  5718 00002EF5 89C8                <1> 	mov	eax, ecx ; actual transfer count
  5719 00002EF7 C3                  <1> 	retn
  5720                              <1> 	
  5721                              <1> vga_pal_funcs:
  5722                              <1> 	; 10/08/2016
  5723                              <1> 	; VGA Palette functions
  5724                              <1> 	;
  5725                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
  5726                              <1> 	; vgabios-0.7a (2011)
  5727                              <1> 	; by the LGPL VGABios developers Team (2001-2008)
  5728                              <1> 	; 'vgabios.c', 'vgarom.asm'
  5729                              <1> 
  5730 00002EF8 3C00                <1> 	cmp	al, 0
  5731 00002EFA 0F848F000000        <1>         je      set_single_palette_reg
  5732                              <1> vga_palf_1001:
  5733 00002F00 3C01                <1> 	cmp	al, 1
  5734 00002F02 0F84B4000000        <1>         je      set_overscan_border_color
  5735                              <1> vga_palf_1002:
  5736 00002F08 3C02                <1> 	cmp	al, 2
  5737 00002F0A 0F84B0000000        <1>         je      set_all_palette_reg
  5738                              <1> vga_palf_1003:
  5739 00002F10 3C03                <1> 	cmp	al, 3
  5740 00002F12 0F84E8000000        <1>         je      toggle_intensity
  5741                              <1> vga_palf_1007:
  5742 00002F18 3C07                <1> 	cmp	al, 7
  5743 00002F1A 0F840D010000        <1>         je      get_single_palette_reg
  5744 00002F20 7266                <1> 	jb	short vga_palf_unknown
  5745                              <1> vga_palf_1008:
  5746 00002F22 3C08                <1> 	cmp	al, 8
  5747 00002F24 0F8437010000        <1>         je      read_overscan_border_color
  5748                              <1> vga_palf_1009:
  5749 00002F2A 3C09                <1> 	cmp	al, 9
  5750 00002F2C 0F8433010000        <1> 	je	get_all_palette_reg
  5751                              <1> vga_palf_1010:
  5752 00002F32 3C10                <1> 	cmp	al, 10h
  5753 00002F34 0F8487010000        <1> 	je 	set_single_dac_reg
  5754 00002F3A 724C                <1> 	jb	short vga_palf_unknown
  5755                              <1> vga_palf_1012:
  5756 00002F3C 3C12                <1> 	cmp	al, 12h
  5757 00002F3E 0F8498010000        <1>         je      set_all_dac_reg
  5758 00002F44 7242                <1> 	jb	short vga_palf_unknown
  5759                              <1> vga_palf_1013:
  5760 00002F46 3C13                <1> 	cmp	al, 13h
  5761 00002F48 0F84CC010000        <1>         je      select_video_dac_color_page
  5762                              <1> vga_palf_1015:
  5763 00002F4E 3C15                <1> 	cmp	al, 15h
  5764 00002F50 0F8412020000        <1> 	je	read_single_dac_reg
  5765 00002F56 7230                <1> 	jb	short vga_palf_unknown
  5766                              <1> vga_palf_1017:
  5767 00002F58 3C17                <1> 	cmp	al, 17h
  5768 00002F5A 0F8428020000        <1>         je      read_all_dac_reg
  5769 00002F60 7226                <1> 	jb	short vga_palf_unknown
  5770                              <1> vga_palf_1018:
  5771 00002F62 3C18                <1> 	cmp	al, 18h
  5772 00002F64 0F845E020000        <1>         je      set_pel_mask
  5773                              <1> vga_palf_1019:
  5774 00002F6A 3C19                <1> 	cmp	al, 19h
  5775 00002F6C 0F8462020000        <1>         je      read_pel_mask
  5776                              <1> vga_palf_101A:
  5777 00002F72 3C1A                <1> 	cmp	al, 1Ah
  5778 00002F74 0F8468020000        <1>         je      read_video_dac_state
  5779                              <1> vga_palf_101B:
  5780 00002F7A 3C1B                <1> 	cmp	al, 1Bh
  5781                              <1> 	;jne	short vga_palf_unknown
  5782 00002F7C 770A                <1> 	ja	short vga_palf_unknown
  5783                              <1>  
  5784 00002F7E E80CF7FFFF          <1> 	call	gray_scale_summing
  5785 00002F83 E9D5E5FFFF          <1>         jmp     VIDEO_RETURN 	
  5786                              <1> 
  5787                              <1> vga_palf_unknown:
  5788 00002F88 29C0                <1> 	sub	eax, eax ; 0 = invalid function
  5789 00002F8A E9D3E5FFFF          <1>         jmp     _video_return
  5790                              <1> 
  5791                              <1> set_single_palette_reg:
  5792                              <1> 	; 10/08/2016
  5793                              <1> 	; Set One Palette Register
  5794                              <1> 	; BL = register number to set
  5795                              <1> 	;     (a 4-bit attribute nibble: 00h-0Fh)
  5796                              <1> 	; BH = 6-bit RGB color to display 
  5797                              <1> 	;      for that attribute
  5798                              <1> 
  5799 00002F8F 80FB14              <1> 	cmp	bl, 14h
  5800                              <1> 	;ja	short no_actl_reg1
  5801 00002F92 0F87C5E5FFFF        <1> 	ja	VIDEO_RETURN
  5802 00002F98 6650                <1> 	push	ax
  5803 00002F9A 6652                <1> 	push	dx
  5804 00002F9C 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5805 00002FA0 EC                  <1> 	in	al, dx
  5806 00002FA1 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5807 00002FA5 88D8                <1> 	mov	al, bl
  5808 00002FA7 EE                  <1> 	out	dx, al
  5809 00002FA8 88F8                <1> 	mov	al, bh
  5810 00002FAA EE                  <1> 	out	dx, al
  5811 00002FAB B020                <1> 	mov	al, 20h
  5812 00002FAD EE                  <1> 	out	dx, al
  5813                              <1> 	; ifdef VBOX
  5814 00002FAE 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5815 00002FB2 EC                  <1> 	in	al, dx
  5816                              <1> 	; endif ; VBOX
  5817 00002FB3 665A                <1> 	pop	dx
  5818 00002FB5 6658                <1> 	pop	ax
  5819                              <1> ;no_actl_reg1:
  5820 00002FB7 E9A1E5FFFF          <1> 	jmp	VIDEO_RETURN
  5821                              <1> 
  5822                              <1> set_overscan_border_color:
  5823                              <1> 	; 10/08/2016
  5824                              <1> 	; Set Overscan/Border Color Register
  5825                              <1> 	; BH = 6-bit RGB color to display 
  5826                              <1> 	;      for that attribute
  5827                              <1> 	
  5828 00002FBC B311                <1> 	mov	bl, 11h
  5829 00002FBE EBCF                <1>   	jmp	short set_single_palette_reg
  5830                              <1> 
  5831                              <1> set_all_palette_reg:
  5832                              <1> 	; 10/08/2016
  5833                              <1> 	; Set All Palette Registers and Overscan
  5834                              <1> 	; EDX = Address of 17 bytes; 
  5835                              <1> 	; an rgbRGB value for each of 16 palette
  5836                              <1> 	; registers plus one for the border.
  5837                              <1> 
  5838 00002FC0 89D6                <1> 	mov	esi, edx ; user buffer
  5839 00002FC2 B911000000          <1> 	mov	ecx, 17
  5840 00002FC7 89E7                <1> 	mov	edi, esp
  5841 00002FC9 83EC14              <1> 	sub	esp, 20	 	 
  5842 00002FCC E876B80000          <1> 	call	transfer_from_user_buffer
  5843                              <1> 	;jc	VIDEO_RETURN
  5844                              <1> 
  5845 00002FD1 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5846 00002FD5 EC                  <1> 	in	al, dx
  5847 00002FD6 B100                <1> 	mov	cl, 0
  5848 00002FD8 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5849                              <1> set_palette_loop:
  5850 00002FDC 88C8                <1> 	mov	al, cl
  5851 00002FDE EE                  <1> 	out	dx, al
  5852 00002FDF 8A07                <1> 	mov	al, [edi]
  5853 00002FE1 EE                  <1> 	out	dx, al
  5854 00002FE2 47                  <1> 	inc	edi
  5855 00002FE3 FEC1                <1> 	inc	cl
  5856 00002FE5 80F910              <1> 	cmp	cl, 10h
  5857 00002FE8 75F2                <1> 	jne	short set_palette_loop
  5858 00002FEA B011                <1> 	mov	al, 11h
  5859 00002FEC EE                  <1> 	out	dx, al
  5860 00002FED 8A07                <1> 	mov	al, [edi]
  5861 00002FEF EE                  <1> 	out	dx, al
  5862 00002FF0 B020                <1> 	mov	al, 20h
  5863 00002FF2 EE                  <1> 	out	dx, al
  5864                              <1> 	; ifdef VBOX
  5865 00002FF3 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5866 00002FF7 EC                  <1> 	in	al, dx
  5867                              <1> 	; endif ; VBOX
  5868 00002FF8 83C414              <1> 	add	esp, 20
  5869 00002FFB E95DE5FFFF          <1> 	jmp	VIDEO_RETURN
  5870                              <1> 
  5871                              <1> toggle_intensity:
  5872                              <1> 	; 10/08/2016
  5873                              <1> 	; Select Foreground Blink or Bold Background
  5874                              <1> 	; BL = 00h = enable bold backgrounds
  5875                              <1> 	;	    (16 background colors)
  5876                              <1>         ;      01h = enable blinking foreground
  5877                              <1> 	;	    (8 background colors)
  5878                              <1> 
  5879 00003000 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5880 00003004 EC                  <1> 	in	al, dx
  5881 00003005 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5882 00003009 B010                <1> 	mov	al, 10h
  5883 0000300B EE                  <1> 	out	dx, al
  5884 0000300C 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  5885 00003010 EC                  <1> 	in	al, dx
  5886 00003011 24F7                <1> 	and	al, 0F7h
  5887 00003013 80E301              <1> 	and	bl, 01h
  5888 00003016 C0E303              <1> 	shl	bl, 3
  5889 00003019 08D8                <1> 	or	al, bl
  5890 0000301B 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5891 0000301F EE                  <1> 	out	dx, al
  5892 00003020 B020                <1> 	mov	al, 20h
  5893 00003022 EE                  <1> 	out	dx, al
  5894                              <1> 	; ifdef VBOX
  5895 00003023 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5896 00003027 EC                  <1> 	in	al, dx
  5897                              <1> 	; endif ; VBOX
  5898 00003028 E930E5FFFF          <1> 	jmp	VIDEO_RETURN
  5899                              <1> 
  5900                              <1> get_single_palette_reg:
  5901                              <1> 	; 10/08/2016
  5902                              <1> 	; Read One Palette Register
  5903                              <1>         ; INPUT:
  5904                              <1> 	; BL = Palette register to read (00h-0Fh)
  5905                              <1> 	; OUTPUT:
  5906                              <1> 	; BH = Current rgbRGB value of specified register
  5907                              <1> 	;      for that attribute
  5908                              <1> 
  5909 0000302D 80FB14              <1> 	cmp	bl, 14h
  5910                              <1> 	;ja	short no_actl_reg2
  5911 00003030 0F8727E5FFFF        <1> 	ja	VIDEO_RETURN
  5912                              <1> 
  5913 00003036 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5914 0000303A EC                  <1> 	in	al, dx
  5915 0000303B 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5916 0000303F 88D8                <1> 	mov	al, bl
  5917 00003041 EE                  <1> 	out	dx, al
  5918 00003042 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  5919 00003046 EC                  <1> 	in	al, dx
  5920 00003047 8844240D            <1> 	mov	[esp+13], al ; bh
  5921 0000304B 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5922 0000304F EC                  <1> 	in	al, dx
  5923 00003050 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5924 00003054 B020                <1> 	mov	al, 20h
  5925 00003056 EE                  <1> 	out	dx, al
  5926                              <1> 	; ifdef VBOX
  5927 00003057 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5928 0000305B EC                  <1> 	in	al, dx
  5929                              <1> 	; endif ; VBOX
  5930 0000305C E9FCE4FFFF          <1> 	jmp	VIDEO_RETURN
  5931                              <1> 
  5932                              <1> read_overscan_border_color:
  5933                              <1> 	; 10/08/2016
  5934                              <1> 	; Read Overscan Register
  5935                              <1> 	; OUTPUT:
  5936                              <1> 	; BH = current rgbRGB value 
  5937                              <1> 	;      of the overscan/border register
  5938                              <1> 
  5939 00003061 B311                <1> 	mov	bl, 11h
  5940 00003063 EBC8                <1> 	jmp	short get_single_palette_reg
  5941                              <1> 
  5942                              <1> get_all_palette_reg:
  5943                              <1> 	; 10/08/2016
  5944                              <1> 	; Read All Palette Registers
  5945                              <1> 	; EDX = Address of 17-byte buffer 
  5946                              <1> 	;	to receive data
  5947                              <1> 	
  5948 00003065 89D7                <1> 	mov	edi, edx
  5949 00003067 89E3                <1> 	mov	ebx, esp
  5950 00003069 89DE                <1> 	mov	esi, ebx
  5951 0000306B 83EC14              <1> 	sub	esp, 20	 
  5952                              <1> 
  5953 0000306E B100                <1> 	mov	cl, 0
  5954                              <1> get_palette_loop:
  5955 00003070 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5956 00003074 EC                  <1> 	in	al, dx
  5957 00003075 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5958 00003079 88C8                <1> 	mov	al, cl
  5959 0000307B EE                  <1> 	out	dx, al
  5960 0000307C 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  5961 00003080 EC                  <1> 	in	al, dx
  5962 00003081 8803                <1> 	mov	[ebx], al
  5963 00003083 43                  <1> 	inc	ebx
  5964 00003084 FEC1                <1> 	inc	cl
  5965 00003086 80F910              <1> 	cmp	cl, 10h
  5966 00003089 75E5                <1> 	jne	short get_palette_loop
  5967 0000308B 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5968 0000308F EC                  <1> 	in	al, dx
  5969 00003090 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5970 00003094 B011                <1> 	mov	al, 11h
  5971 00003096 EE                  <1> 	out	dx, al
  5972 00003097 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  5973 0000309B EC                  <1> 	in	al, dx
  5974 0000309C 8803                <1> 	mov	[ebx], al
  5975 0000309E 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5976 000030A2 EC                  <1> 	in	al, dx
  5977 000030A3 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  5978 000030A7 B020                <1> 	mov	al, 20h
  5979 000030A9 EE                  <1> 	out	dx, al
  5980                              <1> 	; ifdef VBOX
  5981 000030AA 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  5982 000030AE EC                  <1> 	in	al, dx
  5983                              <1> 	; endif ; VBOX
  5984                              <1> 
  5985 000030AF B911000000          <1> 	mov	ecx, 17 ; transfer (byte) count
  5986                              <1> 	; ESI = source address in system space
  5987                              <1> 	; EDI = user's buffer address
  5988 000030B4 E844B70000          <1> 	call	transfer_to_user_buffer
  5989                              <1> 
  5990 000030B9 83C414              <1> 	add	esp, 20
  5991 000030BC E99CE4FFFF          <1> 	jmp	VIDEO_RETURN
  5992                              <1> 
  5993                              <1> set_single_dac_reg:
  5994                              <1> 	; 10/08/2016
  5995                              <1> 	; Set One DAC Color Register
  5996                              <1> 	; BX = color register to set (0-255)
  5997                              <1>         ; CH = green value (00h-3Fh)
  5998                              <1>         ; CL = blue value  (00h-3Fh)
  5999                              <1>         ; DH = red value   (00h-3Fh)
  6000                              <1> 
  6001 000030C1 6652                <1> 	push	dx
  6002 000030C3 66BAC803            <1> 	mov	dx, 3C8h ; VGAREG_DAC_WRITE_ADDRESS
  6003 000030C7 88D8                <1> 	mov	al, bl
  6004 000030C9 EE                  <1> 	out	dx, al
  6005                              <1> 	;mov	dx, 3C9h ; VGAREG_DAC_DATA
  6006 000030CA 6642                <1> 	inc	dx
  6007 000030CC 6658                <1> 	pop	ax
  6008 000030CE 88E0                <1> 	mov	al, ah
  6009 000030D0 EE                  <1> 	out	dx, al
  6010 000030D1 88E8                <1> 	mov	al, ch
  6011 000030D3 EE                  <1> 	out	dx, al
  6012 000030D4 88C8                <1> 	mov	al, cl
  6013 000030D6 EE                  <1> 	out	dx, al
  6014 000030D7 E981E4FFFF          <1> 	jmp	VIDEO_RETURN
  6015                              <1> 
  6016                              <1> set_all_dac_reg:
  6017                              <1> 	; 12/08/2016
  6018                              <1> 	; 11/08/2016
  6019                              <1> 	; 10/08/2016
  6020                              <1> 	; Set a Block of DAC Color Register
  6021                              <1> 	; BX = first DAC register to set (0-00FFh)
  6022                              <1> 	; ECX = number of registers to set (0-00FFh)
  6023                              <1> 	; EDX = addr of a table of R,G,B values 
  6024                              <1> 	;	(it will be CX*3 bytes long)
  6025                              <1> 
  6026 000030DC 89D6                <1> 	mov	esi, edx ; user buffer
  6027 000030DE 89CA                <1> 	mov	edx, ecx
  6028 000030E0 66D1E1              <1> 	shl	cx, 1 ; *2
  6029 000030E3 01D1                <1> 	add	ecx, edx ; ecx = 3*ecx
  6030 000030E5 89E5                <1> 	mov	ebp, esp
  6031 000030E7 89EF                <1> 	mov	edi, ebp
  6032 000030E9 29CF                <1> 	sub	edi, ecx
  6033 000030EB 6683E7FC            <1> 	and	di, 0FFFCh ; (dword alignment)
  6034 000030EF 89FC                <1> 	mov	esp, edi
  6035 000030F1 E851B70000          <1> 	call	transfer_from_user_buffer
  6036                              <1> 	;jc	VIDEO_RETURN
  6037                              <1> 
  6038 000030F6 89D1                <1> 	mov	ecx, edx
  6039 000030F8 66BAC803            <1> 	mov	dx, 3C8h ; VGAREG_DAC_WRITE_ADDRESS
  6040 000030FC 88D8                <1> 	mov	al, bl
  6041 000030FE EE                  <1> 	out	dx, al
  6042 000030FF 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  6043                              <1> set_dac_loop:
  6044 00003103 8A07                <1> 	mov	al, [edi]
  6045 00003105 EE                  <1> 	out	dx, al
  6046 00003106 47                  <1> 	inc	edi
  6047 00003107 8A07                <1> 	mov	al, [edi]
  6048 00003109 EE                  <1> 	out	dx, al
  6049 0000310A 47                  <1> 	inc	edi
  6050 0000310B 8A07                <1> 	mov	al, [edi]
  6051 0000310D EE                  <1> 	out	dx, al
  6052 0000310E 47                  <1> 	inc	edi
  6053 0000310F 6649                <1> 	dec	cx
  6054 00003111 75F0                <1> 	jnz	short set_dac_loop
  6055 00003113 89EC                <1> 	mov	esp, ebp
  6056 00003115 E943E4FFFF          <1> 	jmp	VIDEO_RETURN
  6057                              <1> 
  6058                              <1> select_video_dac_color_page:
  6059                              <1> 	; 10/08/2016
  6060                              <1> 	; DAC Color Paging Functions
  6061                              <1> 	; BL = 00H = select color paging mode
  6062                              <1>         ;       BH = paging mode
  6063                              <1>         ;            00h = 4 blocks of 64 registers
  6064                              <1>         ;            01h = 16 blocks of 16 registers
  6065                              <1> 	; BL = 01H = activate color page
  6066                              <1>         ;       BH = DAC color page number
  6067                              <1>         ;            00h-03h (4-page/64-reg mode)
  6068                              <1>         ;            00h-0Fh (16-page/16-reg mode)
  6069                              <1> 
  6070 0000311A 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6071 0000311E EC                  <1> 	in	al, dx
  6072 0000311F 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6073 00003123 B010                <1> 	mov	al, 10h
  6074 00003125 EE                  <1> 	out	dx, al
  6075 00003126 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  6076 0000312A EC                  <1> 	in	al, dx
  6077 0000312B 80E301              <1> 	and	bl, 01h
  6078 0000312E 750E                <1> 	jnz	short set_dac_page
  6079 00003130 247F                <1> 	and	al, 07Fh
  6080 00003132 C0E707              <1> 	shl	bh, 7
  6081 00003135 08F8                <1> 	or	al, bh
  6082 00003137 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6083 0000313B EE                  <1> 	out	dx, al
  6084 0000313C EB1D                <1> 	jmp	short set_actl_normal
  6085                              <1> set_dac_page:
  6086 0000313E 6650                <1> 	push	ax
  6087 00003140 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6088 00003144 EC                  <1> 	in	al, dx
  6089 00003145 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6090 00003149 B014                <1> 	mov	al, 14h
  6091 0000314B EE                  <1> 	out	dx, al
  6092 0000314C 6658                <1> 	pop	ax
  6093 0000314E 2480                <1> 	and	al, 80h
  6094 00003150 7503                <1> 	jnz	short set_dac_16_page
  6095 00003152 C0E702              <1> 	shl	bh, 2
  6096                              <1> set_dac_16_page:
  6097 00003155 80E70F              <1> 	and	bh, 0Fh
  6098 00003158 88F8                <1> 	mov	al, bh
  6099 0000315A EE                  <1> 	out	dx, al
  6100                              <1> set_actl_normal:
  6101 0000315B B020                <1> 	mov	al, 20h
  6102 0000315D EE                  <1> 	out	dx, al
  6103                              <1> 	; ifdef VBOX
  6104 0000315E 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6105 00003162 EC                  <1> 	in	al, dx
  6106                              <1> 	; endif ; VBOX
  6107 00003163 E9F5E3FFFF          <1> 	jmp	VIDEO_RETURN	
  6108                              <1> 
  6109                              <1> read_single_dac_reg:
  6110                              <1> 	; 10/08/2016
  6111                              <1> 	; Read One DAC Color Register
  6112                              <1> 	; INPUT:
  6113                              <1> 	; BX = color register to read (0-255)
  6114                              <1> 	; OUTPUT:
  6115                              <1> 	; CH = green value (00h-3Fh)
  6116                              <1>         ; CL = blue value  (00h-3Fh)
  6117                              <1>         ; DH = red value   (00h-3Fh)
  6118                              <1> 
  6119 00003168 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  6120 0000316C 88D8                <1> 	mov	al, bl
  6121 0000316E EE                  <1> 	out	dx, al
  6122 0000316F 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  6123 00003173 EC                  <1> 	in	al, dx
  6124 00003174 88442415            <1> 	mov	[esp+21], al ; dh
  6125 00003178 EC                  <1> 	in	al, dx
  6126 00003179 88C5                <1> 	mov	ch, al
  6127 0000317B EC                  <1> 	in	al, dx
  6128 0000317C 88C1                <1> 	mov	cl, al
  6129 0000317E 66894C2410          <1> 	mov	[esp+16], cx ; cx
  6130 00003183 E9D5E3FFFF          <1> 	jmp	VIDEO_RETURN	
  6131                              <1> 
  6132                              <1> read_all_dac_reg:
  6133                              <1> 	; 12/08/2016
  6134                              <1> 	; 11/08/2016
  6135                              <1> 	; 10/08/2016
  6136                              <1> 	; Read a Block of DAC Color Registers
  6137                              <1>         ; BX = first DAC register to read (0-00FFh)
  6138                              <1>         ; ECX = number of registers to read (0-00FFh)
  6139                              <1>         ; EDX = addr of a buffer to hold R,G,B values
  6140                              <1> 	;	(CX*3 bytes long)
  6141                              <1> 
  6142 00003188 89D7                <1> 	mov	edi, edx ; user buffer
  6143 0000318A 89CA                <1> 	mov	edx, ecx
  6144 0000318C 66D1E2              <1> 	shl	dx, 1 ; *2
  6145 0000318F 01CA                <1> 	add	edx, ecx ; edx = 3*ecx
  6146 00003191 89E5                <1> 	mov	ebp, esp
  6147 00003193 89EE                <1> 	mov	esi, ebp
  6148 00003195 29D6                <1> 	sub	esi, edx
  6149 00003197 6683E6FC            <1> 	and	si, 0FFFCh ; (dword alignment)
  6150 0000319B 89F4                <1> 	mov	esp, esi
  6151 0000319D 52                  <1> 	push	edx ; 3*ecx
  6152 0000319E 66BAC703            <1> 	mov	dx, 3C7h ; VGAREG_DAC_READ_ADDRESS
  6153 000031A2 88D8                <1> 	mov	al, bl
  6154 000031A4 EE                  <1> 	out	dx, al
  6155 000031A5 66BAC903            <1> 	mov	dx, 3C9h ; VGAREG_DAC_DATA
  6156 000031A9 89F3                <1> 	mov	ebx, esi
  6157                              <1> read_dac_loop:
  6158 000031AB EC                  <1> 	in	al, dx
  6159 000031AC 8803                <1> 	mov	[ebx], al
  6160 000031AE 43                  <1> 	inc	ebx
  6161 000031AF EC                  <1> 	in	al, dx
  6162 000031B0 8803                <1> 	mov	[ebx], al
  6163 000031B2 43                  <1> 	inc	ebx
  6164 000031B3 EC                  <1> 	in	al, dx
  6165 000031B4 8803                <1> 	mov	[ebx], al
  6166 000031B6 43                  <1> 	inc	ebx
  6167 000031B7 6649                <1> 	dec	cx
  6168 000031B9 75F0                <1> 	jnz	short read_dac_loop
  6169 000031BB 59                  <1> 	pop	ecx ; 3*ecx
  6170                              <1> 	; ECX = transfer (byte) count
  6171                              <1> 	; ESI = source address in system space
  6172                              <1> 	; EDI = user's buffer address
  6173 000031BC E83CB60000          <1> 	call	transfer_to_user_buffer
  6174 000031C1 89EC                <1> 	mov	esp, ebp
  6175 000031C3 E995E3FFFF          <1> 	jmp	VIDEO_RETURN
  6176                              <1> 
  6177                              <1> set_pel_mask:
  6178                              <1> 	; 10/08/2016
  6179                              <1> 	; BL = mask value
  6180 000031C8 66BAC603            <1> 	mov	dx, 3C6h ; VGAREG_PEL_MASK
  6181 000031CC 88D8                <1> 	mov	al, bl
  6182 000031CE EE                  <1> 	out	dx, al
  6183 000031CF E989E3FFFF          <1> 	jmp	VIDEO_RETURN
  6184                              <1> 
  6185                              <1> read_pel_mask:
  6186                              <1> 	; 10/08/2016
  6187                              <1> 	; Output: BL = mask value 
  6188 000031D4 66BAC603            <1> 	mov	dx, 3C6h ; VGAREG_PEL_MASK
  6189 000031D8 EC                  <1> 	in	al, dx
  6190 000031D9 8844240C            <1> 	mov	[esp+12], al ; bl
  6191 000031DD E97BE3FFFF          <1> 	jmp	VIDEO_RETURN
  6192                              <1> 
  6193                              <1> read_video_dac_state:
  6194                              <1> 	; 10/08/2016
  6195                              <1> 	; Query DAC Color Paging State
  6196                              <1> 	; Output:
  6197                              <1> 	; BH = current active DAC color page
  6198                              <1>         ; BL = current active DAC paging mode
  6199                              <1> 
  6200 000031E2 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6201 000031E6 EC                  <1> 	in	al, dx
  6202 000031E7 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6203 000031EB B010                <1> 	mov	al, 10h
  6204 000031ED EE                  <1> 	out	dx, al
  6205 000031EE 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  6206 000031F2 EC                  <1> 	in	al, dx
  6207 000031F3 88C3                <1> 	mov	bl, al
  6208 000031F5 C0EB07              <1> 	shr	bl, 7
  6209 000031F8 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6210 000031FC EC                  <1> 	in	al, dx
  6211 000031FD 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6212 00003201 B014                <1> 	mov	al, 14h
  6213 00003203 EE                  <1> 	out	dx, al
  6214 00003204 66BAC103            <1> 	mov	dx, 3C1h ; VGAREG_ACTL_READ_DATA
  6215 00003208 EC                  <1> 	in	al, dx
  6216 00003209 88C7                <1> 	mov	bh, al
  6217 0000320B 80E70F              <1> 	and	bh, 0Fh
  6218 0000320E F6C301              <1> 	test	bl, 01
  6219 00003211 7503                <1> 	jnz	short get_dac_16_page
  6220 00003213 C0EF02              <1> 	shr	bh, 2
  6221                              <1> get_dac_16_page:
  6222 00003216 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6223 0000321A EC                  <1> 	in	al, dx
  6224 0000321B 66BAC003            <1> 	mov	dx, 3C0h ; VGAREG_ACTL_ADDRESS
  6225 0000321F B020                <1> 	mov	al, 20h
  6226 00003221 EE                  <1> 	out	dx, al
  6227                              <1> 	; ifdef VBOX
  6228 00003222 66BADA03            <1> 	mov	dx, 3DAh ; VGAREG_ACTL_RESET
  6229 00003226 EC                  <1> 	in	al, dx
  6230                              <1> 	; endif ; VBOX 
  6231 00003227 66895C240C          <1> 	mov	[esp+12], bx ; bx
  6232 0000322C E92CE3FFFF          <1> 	jmp	VIDEO_RETURN
  6233                              <1> 
  6234                              <1> ; % include 'vidata.s' ; VIDEO DATA
  6235                              <1> 
  6236                              <1> ; /// End Of VIDEO FUNCTIONS ///
  1942                                  
  1943                                  setup_rtc_int:
  1944                                  ; source: http://wiki.osdev.org/RTC
  1945 00003231 FA                      	cli		; disable interrupts
  1946                                  	; default int frequency is 1024 Hz (Lower 4 bits of register A is 0110b or 6)
  1947                                  	; in order to change this ...
  1948                                  	; frequency  = 32768 >> (rate-1) --> 32768 >> 5 = 1024
  1949                                  	; (rate must be above 2 and not over 15)
  1950                                  	; new rate = 15 --> 32768 >> (15-1) = 2 Hz
  1951 00003232 B08A                    	mov	al, 8Ah 
  1952 00003234 E670                    	out	70h, al ; set index to register A, disable NMI
  1953 00003236 90                      	nop
  1954 00003237 E471                    	in	al, 71h ; get initial value of register A
  1955 00003239 88C4                    	mov 	ah, al
  1956 0000323B 80E4F0                  	and	ah, 0F0h
  1957 0000323E B08A                    	mov	al, 8Ah 
  1958 00003240 E670                    	out	70h, al ; reset index to register A
  1959 00003242 88E0                    	mov	al, ah
  1960 00003244 0C0F                    	or	al, 0Fh	; new rate (0Fh -> 15)
  1961 00003246 E671                    	out	71h, al ; write only our rate to A. Note, rate is the bottom 4 bits. 
  1962                                  	; enable RTC interrupt
  1963 00003248 B08B                    	mov	al, 8Bh ;
  1964 0000324A E670                    	out	70h, al ; select register B and disable NMI
  1965 0000324C 90                      	nop
  1966 0000324D E471                    	in	al, 71h ; read the current value of register B
  1967 0000324F 88C4                    	mov	ah, al  ;
  1968 00003251 B08B                    	mov 	al, 8Bh ;
  1969 00003253 E670                    	out	70h, al ; set the index again (a read will reset the index to register B)	
  1970 00003255 88E0                    	mov	al, ah  ;
  1971 00003257 0C40                    	or	al, 40h ;
  1972 00003259 E671                    	out	71h, al ; write the previous value ORed with 0x40. This turns on bit 6 of register B
  1973 0000325B FB                      	sti
  1974 0000325C C3                      	retn
  1975                                  
  1976                                  ; Write memory information
  1977                                  ; 29/01/2016
  1978                                  ; 06/11/2014
  1979                                  ; 14/08/2015 
  1980                                  memory_info:	
  1981 0000325D A1[C4580100]            	mov	eax, [memory_size] ; in pages
  1982 00003262 50                      	push	eax
  1983 00003263 C1E00C                  	shl	eax, 12		   ; in bytes
  1984 00003266 BB0A000000              	mov	ebx, 10
  1985 0000326B 89D9                    	mov	ecx, ebx	   ; 10
  1986 0000326D BE[59190100]            	mov	esi, mem_total_b_str	
  1987 00003272 E8BD000000              	call	bintdstr
  1988 00003277 58                      	pop	eax
  1989 00003278 B107                    	mov	cl, 7
  1990 0000327A BE[7D190100]            	mov	esi, mem_total_p_str
  1991 0000327F E8B0000000              	call	bintdstr	
  1992                                  	; 14/08/2015
  1993 00003284 E8C8000000              	call	calc_free_mem
  1994                                  	; edx = calculated free pages
  1995                                  	; ecx = 0
  1996 00003289 A1[C8580100]            	mov 	eax, [free_pages]
  1997 0000328E 39D0                    	cmp	eax, edx ; calculated free mem value 
  1998                                  		; and initial free mem value are same or not?
  1999 00003290 751D                    	jne 	short pmim ; print mem info with '?' if not
  2000 00003292 52                      	push 	edx ; free memory in pages	
  2001                                  	;mov 	eax, edx
  2002 00003293 C1E00C                  	shl	eax, 12 ; convert page count
  2003                                  			; to byte count
  2004 00003296 B10A                    	mov	cl, 10
  2005 00003298 BE[9D190100]            	mov	esi, free_mem_b_str
  2006 0000329D E892000000              	call	bintdstr
  2007 000032A2 58                      	pop	eax
  2008 000032A3 B107                    	mov	cl, 7
  2009 000032A5 BE[C1190100]            	mov	esi, free_mem_p_str
  2010 000032AA E885000000              	call	bintdstr
  2011                                  pmim:
  2012 000032AF BE[47190100]            	mov	esi, msg_memory_info
  2013                                  	;
  2014 000032B4 B407                    	mov	ah, 07h ; Black background, 
  2015                                  			; light gray forecolor
  2016                                  print_kmsg: ; 29/01/2016
  2017 000032B6 8825[EF580100]          	mov	[ccolor], ah
  2018                                  pkmsg_loop:
  2019 000032BC AC                      	lodsb
  2020 000032BD 08C0                    	or	al, al
  2021 000032BF 7410                    	jz	short pkmsg_ok
  2022 000032C1 56                      	push	esi
  2023                                  	; 13/05/2016
  2024 000032C2 0FB61D[EF580100]        	movzx	ebx, byte [ccolor]
  2025                                  			; Video page 0 (bh=0)
  2026 000032C9 E8EDE9FFFF              	call	_write_tty
  2027 000032CE 5E                      	pop	esi
  2028 000032CF EBEB                    	jmp	short pkmsg_loop
  2029                                  pkmsg_ok:
  2030 000032D1 C3                      	retn
  2031                                  
  2032                                  ; Convert binary number to hexadecimal string
  2033                                  ; 10/05/2015  
  2034                                  ; dsectpm.s (28/02/2015)
  2035                                  ; Retro UNIX 386 v1 - Kernel v0.2.0.6  
  2036                                  ; 01/12/2014
  2037                                  ; 25/11/2014
  2038                                  ;
  2039                                  bytetohex:
  2040                                  	; INPUT ->
  2041                                  	; 	AL = byte (binary number)
  2042                                  	; OUTPUT ->
  2043                                  	;	AX = hexadecimal string
  2044                                  	;
  2045 000032D2 53                      	push	ebx
  2046 000032D3 31DB                    	xor	ebx, ebx
  2047 000032D5 88C3                    	mov	bl, al
  2048 000032D7 C0EB04                  	shr	bl, 4
  2049 000032DA 8A9B[24330000]          	mov	bl, [ebx+hexchrs] 	 	
  2050 000032E0 86D8                    	xchg	bl, al
  2051 000032E2 80E30F                  	and	bl, 0Fh
  2052 000032E5 8AA3[24330000]          	mov	ah, [ebx+hexchrs] 
  2053 000032EB 5B                      	pop	ebx	
  2054 000032EC C3                      	retn
  2055                                  
  2056                                  wordtohex:
  2057                                  	; INPUT ->
  2058                                  	; 	AX = word (binary number)
  2059                                  	; OUTPUT ->
  2060                                  	;	EAX = hexadecimal string
  2061                                  	;
  2062 000032ED 53                      	push	ebx
  2063 000032EE 31DB                    	xor	ebx, ebx
  2064 000032F0 86E0                    	xchg	ah, al
  2065 000032F2 6650                    	push	ax
  2066 000032F4 88E3                    	mov	bl, ah
  2067 000032F6 C0EB04                  	shr	bl, 4
  2068 000032F9 8A83[24330000]          	mov	al, [ebx+hexchrs] 	 	
  2069 000032FF 88E3                    	mov	bl, ah
  2070 00003301 80E30F                  	and	bl, 0Fh
  2071 00003304 8AA3[24330000]          	mov	ah, [ebx+hexchrs]
  2072 0000330A C1E010                  	shl	eax, 16
  2073 0000330D 6658                    	pop	ax
  2074 0000330F 5B                      	pop	ebx
  2075 00003310 EBC0                    	jmp	short bytetohex
  2076                                  	;mov	bl, al
  2077                                  	;shr	bl, 4
  2078                                  	;mov	bl, [ebx+hexchrs] 	 	
  2079                                  	;xchg	bl, al	 	
  2080                                  	;and	bl, 0Fh
  2081                                  	;mov	ah, [ebx+hexchrs] 
  2082                                  	;pop	ebx	
  2083                                  	;retn
  2084                                  
  2085                                  dwordtohex:
  2086                                  	; INPUT ->
  2087                                  	; 	EAX = dword (binary number)
  2088                                  	; OUTPUT ->
  2089                                  	;	EDX:EAX = hexadecimal string
  2090                                  	;
  2091 00003312 50                      	push	eax
  2092 00003313 C1E810                  	shr	eax, 16
  2093 00003316 E8D2FFFFFF              	call	wordtohex
  2094 0000331B 89C2                    	mov	edx, eax
  2095 0000331D 58                      	pop	eax
  2096 0000331E E8CAFFFFFF              	call	wordtohex
  2097 00003323 C3                      	retn
  2098                                  
  2099                                  ; 10/05/2015
  2100                                  hex_digits:
  2101                                  hexchrs:
  2102 00003324 303132333435363738-     	db '0123456789ABCDEF'
  2102 0000332D 39414243444546     
  2103                                  
  2104                                  ; Convert binary number to decimal/numeric string
  2105                                  ; 06/11/2014
  2106                                  ; Temporary Code
  2107                                  ;
  2108                                  
  2109                                  bintdstr:
  2110                                  	; EAX = binary number
  2111                                  	; ESI = decimal/numeric string address
  2112                                  	; EBX = divisor (10)
  2113                                  	; ECX = string length (<=10)
  2114 00003334 01CE                    	add	esi, ecx
  2115                                  btdstr0:
  2116 00003336 4E                      	dec	esi
  2117 00003337 31D2                    	xor	edx, edx
  2118 00003339 F7F3                    	div	ebx
  2119 0000333B 80C230                  	add	dl, 30h
  2120 0000333E 8816                    	mov	[esi], dl
  2121 00003340 FEC9                    	dec	cl
  2122 00003342 740C                    	jz	short btdstr2 ; 08/09/2016
  2123 00003344 09C0                    	or	eax, eax
  2124 00003346 75EE                    	jnz	short btdstr0
  2125                                  btdstr1:
  2126 00003348 4E                      	dec	esi
  2127 00003349 C60620                          mov     byte [esi], 20h ; blank space
  2128 0000334C FEC9                    	dec	cl
  2129 0000334E 75F8                    	jnz	short btdstr1
  2130                                  btdstr2:
  2131 00003350 C3                      	retn
  2132                                  
  2133                                  ; Calculate free memory pages on M.A.T.
  2134                                  ; 06/11/2014
  2135                                  ; Temporary Code
  2136                                  ;
  2137                                  
  2138                                  calc_free_mem:
  2139 00003351 31D2                    	xor	edx, edx
  2140                                  	;xor	ecx, ecx
  2141 00003353 668B0D[D8580100]        	mov	cx, [mat_size] ; in pages
  2142 0000335A C1E10A                  	shl	ecx, 10	; 1024 dwords per page
  2143 0000335D BE00001000              	mov	esi, MEM_ALLOC_TBL
  2144                                  cfm0:
  2145 00003362 AD                      	lodsd
  2146 00003363 51                      	push	ecx
  2147 00003364 B920000000              	mov	ecx, 32
  2148                                  cfm1:
  2149 00003369 D1E8                    	shr	eax, 1
  2150 0000336B 7301                    	jnc	short cfm2
  2151 0000336D 42                      	inc	edx
  2152                                  cfm2:
  2153 0000336E E2F9                    	loop	cfm1
  2154 00003370 59                      	pop	ecx
  2155 00003371 E2EF                    	loop	cfm0
  2156 00003373 C3                      	retn
  2157                                  
  2158                                  %include 'diskio.s'  ; 07/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.2 - diskio.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 30/08/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; diskio.inc (22/08/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - DISKIO.INC
    20                              <1> ; Last Modification: 22/08/2015
    21                              <1> ; 	(Initialized Disk Parameters Data is in 'DISKDATA.INC') 
    22                              <1> ; 	(Uninitialized Disk Parameters Data is in 'DISKBSS.INC') 
    23                              <1> 
    24                              <1> ; DISK I/O SYSTEM - Erdogan Tan (Retro UNIX 386 v1 project)
    25                              <1> 
    26                              <1> ; ///////// DISK I/O SYSTEM ///////////////
    27                              <1> 
    28                              <1> ; 06/02/2015
    29                              <1> diskette_io:
    30 00003374 F8                  <1> 	clc ; 20/07/2020
    31 00003375 9C                  <1> 	pushfd
    32 00003376 0E                  <1> 	push 	cs
    33 00003377 E809000000          <1> 	call 	DISKETTE_IO_1
    34 0000337C C3                  <1> 	retn
    35                              <1> 	
    36                              <1> ;;;;;; DISKETTE I/O ;;;;;;;;;;;;;;;;;;;; 06/02/2015 ;;;
    37                              <1> ;//////////////////////////////////////////////////////
    38                              <1> 
    39                              <1> ; DISKETTE I/O - Erdogan Tan (Retro UNIX 386 v1 project)
    40                              <1> ; 20/02/2015
    41                              <1> ; 06/02/2015 (unix386.s)
    42                              <1> ; 16/12/2014 - 02/01/2015 (dsectrm2.s)
    43                              <1> ;
    44                              <1> ; Code (DELAY) modifications - AWARD BIOS 1999 (ADISK.EQU, COMMON.MAC)
    45                              <1> ;
    46                              <1> ; ADISK.EQU
    47                              <1> 
    48                              <1> ;----- Wait control constants 
    49                              <1> 
    50                              <1> ;amount of time to wait while RESET is active.
    51                              <1> 
    52                              <1> WAITCPU_RESET_ON	EQU	21		;Reset on must last at least 14us
    53                              <1> 						;at 250 KBS xfer rate.
    54                              <1> 						;see INTEL MCS, 1985, pg. 5-456
    55                              <1> 
    56                              <1> WAITCPU_FOR_STATUS	EQU	100		;allow 30 microseconds for
    57                              <1> 						;status register to become valid
    58                              <1> 						;before re-reading.
    59                              <1> 
    60                              <1> ;After sending a byte to NEC, status register may remain
    61                              <1> ;incorrectly set for 24 us.
    62                              <1> 
    63                              <1> WAITCPU_RQM_LOW		EQU	24		;number of loops to check for
    64                              <1> 						;RQM low.
    65                              <1> 
    66                              <1> ; COMMON.MAC
    67                              <1> ;
    68                              <1> ;	Timing macros
    69                              <1> ;
    70                              <1> 
    71                              <1> %macro 		SIODELAY 0 			; SHORT IODELAY
    72                              <1> 		jmp short $+2
    73                              <1> %endmacro		
    74                              <1> 
    75                              <1> %macro		IODELAY  0			; NORMAL IODELAY
    76                              <1> 		jmp short $+2
    77                              <1> 		jmp short $+2
    78                              <1> %endmacro
    79                              <1> 
    80                              <1> %macro		NEWIODELAY 0
    81                              <1> 		out	0ebh,al
    82                              <1> %endmacro 
    83                              <1> 
    84                              <1> ; (According to) AWARD BIOS 1999 - ATORGS.ASM (dw -> equ, db -> equ)
    85                              <1> ;;; WAIT_FOR_MEM
    86                              <1> ;WAIT_FDU_INT_LO	equ	017798		; 2.5 secs in 30 micro units.
    87                              <1> ;WAIT_FDU_INT_HI	equ	1
    88                              <1> WAIT_FDU_INT_LH		equ	83334		; 27/02/2015 (2.5 seconds waiting)
    89                              <1> ;;; WAIT_FOR_PORT
    90                              <1> ;WAIT_FDU_SEND_LO	equ	16667		; .5 secons in 30 us units.
    91                              <1> ;WAIT_FDU_SEND_HI	equ	0
    92                              <1> WAIT_FDU_SEND_LH	equ 	16667		; 27/02/2015	
    93                              <1> ;Time to wait while waiting for each byte of NEC results = .5
    94                              <1> ;seconds.  .5 seconds = 500,000 micros.  500,000/30 = 16,667.
    95                              <1> ;WAIT_FDU_RESULTS_LO	equ	16667		; .5 seconds in 30 micro units.
    96                              <1> ;WAIT_FDU_RESULTS_HI	equ	0
    97                              <1> WAIT_FDU_RESULTS_LH	equ	16667  ; 27/02/2015
    98                              <1> ;;; WAIT_REFRESH
    99                              <1> ;amount of time to wait for head settle, per unit in parameter
   100                              <1> ;table = 1 ms.
   101                              <1> WAIT_FDU_HEAD_SETTLE	equ	33		; 1 ms in 30 micro units.
   102                              <1> 
   103                              <1> 
   104                              <1> ; //////////////// DISKETTE I/O ////////////////
   105                              <1> 
   106                              <1> ; 11/12/2014 (copy from IBM PC-XT Model 286 BIOS - POSTEQU.INC)
   107                              <1> 
   108                              <1> ;----------------------------------------
   109                              <1> ;	EQUATES USED BY POST AND BIOS	:
   110                              <1> ;----------------------------------------
   111                              <1> 
   112                              <1> ;--------- 8042 KEYBOARD INTERFACE AND DIAGNOSTIC CONTROL REGISTERS ------------
   113                              <1> ;PORT_A		EQU	060H		; 8042 KEYBOARD SCAN CODE/CONTROL PORT
   114                              <1> ;PORT_B		EQU	061H		; PORT B READ/WRITE DIAGNOSTIC REGISTER
   115                              <1> ;REFRESH_BIT	EQU	00010000B	; REFRESH TEST BIT
   116                              <1> 
   117                              <1> ;----------------------------------------
   118                              <1> ;	CMOS EQUATES FOR THIS SYSTEM	:
   119                              <1> ;-------------------------------------------------------------------------------
   120                              <1> ;CMOS_PORT	EQU	070H		; I/O ADDRESS OF CMOS ADDRESS PORT
   121                              <1> ;CMOS_DATA	EQU	071H		; I/O ADDRESS OF CMOS DATA PORT
   122                              <1> ;NMI		EQU	10000000B	; DISABLE NMI INTERRUPTS MASK -
   123                              <1> 					;  HIGH BIT OF CMOS LOCATION ADDRESS
   124                              <1> 
   125                              <1> ;---------- CMOS TABLE LOCATION ADDRESS'S ## -----------------------------------
   126                              <1> CMOS_DISKETTE	EQU	010H		; DISKETTE DRIVE TYPE BYTE	      ;
   127                              <1> ;		EQU	011H		; - RESERVED			      ;C
   128                              <1> CMOS_DISK	EQU	012H		; FIXED DISK TYPE BYTE		      ;H
   129                              <1> ;		EQU	013H		; - RESERVED			      ;E
   130                              <1> CMOS_EQUIP	EQU	014H		; EQUIPMENT WORD LOW BYTE	      ;C
   131                              <1> 
   132                              <1> ;---------- DISKETTE EQUATES ---------------------------------------------------
   133                              <1> INT_FLAG	EQU	10000000B	; INTERRUPT OCCURRENCE FLAG
   134                              <1> DSK_CHG 	EQU	10000000B	; DISKETTE CHANGE FLAG MASK BIT
   135                              <1> DETERMINED	EQU	00010000B	; SET STATE DETERMINED IN STATE BITS
   136                              <1> HOME		EQU	00010000B	; TRACK 0 MASK
   137                              <1> SENSE_DRV_ST	EQU	00000100B	; SENSE DRIVE STATUS COMMAND
   138                              <1> TRK_SLAP	EQU	030H		; CRASH STOP (48 TPI DRIVES)
   139                              <1> QUIET_SEEK	EQU	00AH		; SEEK TO TRACK 10
   140                              <1> ;MAX_DRV 	EQU	2		; MAX NUMBER OF DRIVES
   141                              <1> HD12_SETTLE	EQU	15		; 1.2 M HEAD SETTLE TIME
   142                              <1> HD320_SETTLE	EQU	20		; 320 K HEAD SETTLE TIME
   143                              <1> MOTOR_WAIT	EQU	37		; 2 SECONDS OF COUNTS FOR MOTOR TURN OFF
   144                              <1> 
   145                              <1> ;---------- DISKETTE ERRORS ----------------------------------------------------
   146                              <1> ;TIME_OUT	EQU	080H		; ATTACHMENT FAILED TO RESPOND
   147                              <1> ;BAD_SEEK	EQU	040H		; SEEK OPERATION FAILED
   148                              <1> BAD_NEC 	EQU	020H		; DISKETTE CONTROLLER HAS FAILED
   149                              <1> BAD_CRC 	EQU	010H		; BAD CRC ON DISKETTE READ
   150                              <1> MED_NOT_FND	EQU	00CH		; MEDIA TYPE NOT FOUND
   151                              <1> DMA_BOUNDARY	EQU	009H		; ATTEMPT TO DMA ACROSS 64K BOUNDARY
   152                              <1> BAD_DMA 	EQU	008H		; DMA OVERRUN ON OPERATION
   153                              <1> MEDIA_CHANGE	EQU	006H		; MEDIA REMOVED ON DUAL ATTACH CARD
   154                              <1> RECORD_NOT_FND	EQU	004H		; REQUESTED SECTOR NOT FOUND
   155                              <1> WRITE_PROTECT	EQU	003H		; WRITE ATTEMPTED ON WRITE PROTECT DISK
   156                              <1> BAD_ADDR_MARK	EQU	002H		; ADDRESS MARK NOT FOUND
   157                              <1> BAD_CMD 	EQU	001H		; BAD COMMAND PASSED TO DISKETTE I/O
   158                              <1> 
   159                              <1> ;---------- DISK CHANGE LINE EQUATES -------------------------------------------
   160                              <1> NOCHGLN 	EQU	001H		; NO DISK CHANGE LINE AVAILABLE
   161                              <1> CHGLN		EQU	002H		; DISK CHANGE LINE AVAILABLE
   162                              <1> 
   163                              <1> ;---------- MEDIA/DRIVE STATE INDICATORS ---------------------------------------
   164                              <1> TRK_CAPA	EQU	00000001B	; 80 TRACK CAPABILITY
   165                              <1> FMT_CAPA	EQU	00000010B	; MULTIPLE FORMAT CAPABILITY (1.2M)
   166                              <1> DRV_DET 	EQU	00000100B	; DRIVE DETERMINED
   167                              <1> MED_DET 	EQU	00010000B	; MEDIA DETERMINED BIT
   168                              <1> DBL_STEP	EQU	00100000B	; DOUBLE STEP BIT
   169                              <1> RATE_MSK	EQU	11000000B	; MASK FOR CLEARING ALL BUT RATE
   170                              <1> RATE_500	EQU	00000000B	; 500 KBS DATA RATE
   171                              <1> RATE_300	EQU	01000000B	; 300 KBS DATA RATE
   172                              <1> RATE_250	EQU	10000000B	; 250 KBS DATA RATE
   173                              <1> STRT_MSK	EQU	00001100B	; OPERATION START RATE MASK
   174                              <1> SEND_MSK	EQU	11000000B	; MASK FOR SEND RATE BITS
   175                              <1> 
   176                              <1> ;---------- MEDIA/DRIVE STATE INDICATORS COMPATIBILITY -------------------------
   177                              <1> M3D3U		EQU	00000000B	; 360 MEDIA/DRIVE NOT ESTABLISHED
   178                              <1> M3D1U		EQU	00000001B	; 360 MEDIA,1.2DRIVE NOT ESTABLISHED
   179                              <1> M1D1U		EQU	00000010B	; 1.2 MEDIA/DRIVE NOT ESTABLISHED
   180                              <1> MED_UNK 	EQU	00000111B	; NONE OF THE ABOVE
   181                              <1> 
   182                              <1> ;---------- INTERRUPT EQUATES --------------------------------------------------
   183                              <1> ;EOI		EQU	020H		; END OF INTERRUPT COMMAND TO 8259
   184                              <1> ;INTA00		EQU	020H		; 8259 PORT
   185                              <1> INTA01		EQU	021H		; 8259 PORT
   186                              <1> INTB00		EQU	0A0H		; 2ND 8259
   187                              <1> INTB01		EQU	0A1H		;
   188                              <1> 
   189                              <1> ;-------------------------------------------------------------------------------
   190                              <1> DMA08		EQU	008H		; DMA STATUS REGISTER PORT ADDRESS
   191                              <1> DMA		EQU	000H		; DMA CH.0 ADDRESS REGISTER PORT ADDRESS
   192                              <1> DMA18		EQU	0D0H		; 2ND DMA STATUS PORT ADDRESS
   193                              <1> DMA1		EQU	0C0H		; 2ND DMA CH.0 ADDRESS REGISTER ADDRESS
   194                              <1> ;-------------------------------------------------------------------------------
   195                              <1> ;TIMER		EQU	040H		; 8254 TIMER - BASE ADDRESS
   196                              <1> 
   197                              <1> ;-------------------------------------------------------------------------------
   198                              <1> DMA_PAGE	EQU	081H		; START OF DMA PAGE REGISTERS
   199                              <1> 
   200                              <1> ; 06/02/2015 (unix386.s, protected mode modifications)
   201                              <1> ; (unix386.s <-- dsectrm2.s)
   202                              <1> ; 11/12/2014 (copy from IBM PC-XT Model 286 BIOS - DSEG.INC)
   203                              <1> 
   204                              <1> ; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
   205                              <1> ; 10/12/2014
   206                              <1> ;
   207                              <1> ;int40h:
   208                              <1> ;	pushf
   209                              <1> ;	push 	cs
   210                              <1> ;	;cli
   211                              <1> ;	call 	DISKETTE_IO_1
   212                              <1> ;	retn
   213                              <1> 
   214                              <1> ; DSKETTE ----- 04/21/86 DISKETTE BIOS
   215                              <1> ; (IBM PC XT Model 286 System BIOS Source Code, 04-21-86)
   216                              <1> ;
   217                              <1> 
   218                              <1> ;-- INT13H ---------------------------------------------------------------------
   219                              <1> ; DISKETTE I/O
   220                              <1> ;	THIS INTERFACE PROVIDES ACCESS TO THE 5 1/4 INCH 360 KB,
   221                              <1> ;	1.2 MB, 720 KB AND 1.44 MB DISKETTE DRIVES.
   222                              <1> ; INPUT
   223                              <1> ;	(AH) =  00H RESET DISKETTE SYSTEM
   224                              <1> ;		HARD RESET TO NEC, PREPARE COMMAND, RECALIBRATE REQUIRED
   225                              <1> ;		ON ALL DRIVES
   226                              <1> ;------------------------------------------------------------------------------- 
   227                              <1> ;	(AH)= 01H  READ THE STATUS OF THE SYSTEM INTO (AH)
   228                              <1> ;		@DISKETTE_STATUS FROM LAST OPERATION IS USED
   229                              <1> ;-------------------------------------------------------------------------------
   230                              <1> ;	REGISTERS FOR READ/WRITE/VERIFY/FORMAT
   231                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED)
   232                              <1> ;	(DH) - HEAD NUMBER (0-1 ALLOWED, NOT VALUE CHECKED)
   233                              <1> ;	(CH) - TRACK NUMBER (NOT VALUE CHECKED)
   234                              <1> ;		MEDIA	DRIVE	TRACK NUMBER
   235                              <1> ;		320/360	320/360	    0-39
   236                              <1> ;		320/360	1.2M	    0-39
   237                              <1> ;		1.2M	1.2M	    0-79
   238                              <1> ;		720K	720K	    0-79
   239                              <1> ;		1.44M	1.44M	    0-79	
   240                              <1> ;	(CL) - 	SECTOR NUMBER (NOT VALUE CHECKED, NOT USED FOR FORMAT)
   241                              <1> ;		MEDIA	DRIVE	SECTOR NUMBER
   242                              <1> ;		320/360	320/360	     1-8/9
   243                              <1> ;		320/360	1.2M	     1-8/9
   244                              <1> ;		1.2M	1.2M	     1-15
   245                              <1> ;		720K	720K	     1-9
   246                              <1> ;		1.44M	1.44M	     1-18		
   247                              <1> ;	(AL)	NUMBER OF SECTORS (NOT VALUE CHECKED)
   248                              <1> ;		MEDIA	DRIVE	MAX NUMBER OF SECTORS
   249                              <1> ;		320/360	320/360	        8/9
   250                              <1> ;		320/360	1.2M	        8/9
   251                              <1> ;		1.2M	1.2M		15
   252                              <1> ;		720K	720K		9
   253                              <1> ;		1.44M	1.44M		18
   254                              <1> ;
   255                              <1> ;	(ES:BX) - ADDRESS OF BUFFER (NOT REQUIRED FOR VERIFY)
   256                              <1> ;
   257                              <1> ;-------------------------------------------------------------------------------
   258                              <1> ;	(AH)= 02H  READ THE DESIRED SECTORS INTO MEMORY
   259                              <1> ;-------------------------------------------------------------------------------
   260                              <1> ;	(AH)= 03H  WRITE THE DESIRED SECTORS FROM MEMORY
   261                              <1> ;-------------------------------------------------------------------------------
   262                              <1> ;	(AH)= 04H  VERIFY THE DESIRED SECTORS
   263                              <1> ;-------------------------------------------------------------------------------
   264                              <1> ;	(AH)= 05H  FORMAT THE DESIRED TRACK
   265                              <1> ;		(ES,BX) MUST POINT TO THE COLLECTION OF DESIRED ADDRESS FIELDS
   266                              <1> ;		FOR THE	TRACK. EACH FIELD IS COMPOSED OF 4 BYTES, (C,H,R,N),
   267                              <1> ;		WHERE C = TRACK NUMBER, H=HEAD NUMBER, R = SECTOR NUMBER, 
   268                              <1> ;		N= NUMBER OF BYTES PER SECTOR (00=128,01=256,02=512,03=1024),
   269                              <1> ;		THERE MUST BE ONE ENTRY FOR EVERY SECTOR ON THE TRACK.
   270                              <1> ;		THIS INFORMATION IS USED TO FIND THE REQUESTED SECTOR DURING 
   271                              <1> ;		READ/WRITE ACCESS.
   272                              <1> ;		PRIOR TO FORMATTING A DISKETTE, IF THERE EXISTS MORE THAN
   273                              <1> ;		ONE SUPPORTED MEDIA FORMAT TYPE WITHIN THE DRIVE IN QUESTION,
   274                              <1> ;		THEN "SET DASD TYPE" (INT 13H, AH = 17H) OR 'SET MEDIA TYPE'
   275                              <1> ;		(INT 13H, AH =  18H) MUST BE CALLED TO SET THE DISKETTE TYPE
   276                              <1> ;		THAT IS TO BE FORMATTED. IF "SET DASD TYPE" OR "SET MEDIA TYPE"
   277                              <1> ;		IS NOT CALLED, THE FORMAT ROUTINE WILL ASSUME THE 
   278                              <1> ;		MEDIA FORMAT TO BE THE MAXIMUM CAPACITY OF THE DRIVE.
   279                              <1> ;
   280                              <1> ;		THESE PARAMETERS OF DISK BASE MUST BE CHANGED IN ORDER TO
   281                              <1> ;		FORMAT THE FOLLOWING MEDIAS:
   282                              <1> ;		---------------------------------------------
   283                              <1> ;		: MEDIA  :     DRIVE      : PARM 1 : PARM 2 :
   284                              <1> ;		---------------------------------------------
   285                              <1> ;		: 320K	 : 320K/360K/1.2M :  50H   :   8    :
   286                              <1> ;		: 360K	 : 320K/360K/1.2M :  50H   :   9    :
   287                              <1> ;		: 1.2M	 : 1.2M           :  54H   :  15    :
   288                              <1> ;		: 720K	 : 720K/1.44M     :  50H   :   9    :
   289                              <1> ;		: 1.44M	 : 1.44M          :  6CH   :  18    :		  	
   290                              <1> ;		---------------------------------------------
   291                              <1> ;		NOTES: - PARM 1 = GAP LENGTH FOR FORMAT
   292                              <1> ;		       - PARM 2 = EOT (LAST SECTOR ON TRACK)
   293                              <1> ;		       - DISK BASE IS POINTED BY DISK POINTER LOCATED
   294                              <1> ;			 AT ABSOLUTE ADDRESS 0:78.
   295                              <1> ;		       - WHEN FORMAT OPERATIONS ARE COMPLETE, THE PARAMETERS
   296                              <1> ;			 SHOULD BE RESTORED TO THEIR RESPECTIVE INITIAL VALUES.			
   297                              <1> ;-------------------------------------------------------------------------------
   298                              <1> ;	(AH) = 08H READ DRIVE PARAMETERS
   299                              <1> ;	REGISTERS
   300                              <1> ;	  INPUT
   301                              <1> ;	    (DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED)
   302                              <1> ;	     ** 27/05/2016 - TRDOS 386 (TRDOS v2.0) **	
   303                              <1> ;            ** EBX = Buffer address for floppy disk parameters table **
   304                              <1> ;	  OUTPUT
   305                              <1> ;	    (ES:DI) POINTS TO DRIVE PARAMETER TABLE
   306                              <1> ; 	    *** TRDOS 386 note: floppy disk parameter table (16 bytes)
   307                              <1> ;	    will be returned to user in EBX, buffer address *** 27/05/2016 ***		
   308                              <1> ;					
   309                              <1> ;	    (CH) - LOW ORDER 8 OF 10 BITS MAXIMUM NUMBER OF TRACKS
   310                              <1> ;	    (CL) - BITS 7 & 6 - HIGH ORDER TWO BITS OF MAXIMUM TRACKS
   311                              <1> ;	           BITS 5 THRU 0 - MAXIMUM SECTORS PER TRACK
   312                              <1> ;	    (DH) - MAXIMUM HEAD NUMBER
   313                              <1> ;	    (DL) - NUMBER OF DISKETTE DRIVES INSTALLED
   314                              <1> ;	    (BH) - 0
   315                              <1> ;	    (BL) - BITS 7 THRU 4 - 0
   316                              <1> ;	           BITS 3 THRU 0 - VALID DRIVE TYPE VALUE IN CMOS
   317                              <1> ;	    (AX) - 0
   318                              <1> ;	 UNDER THE FOLLOWING CIRCUMSTANCES:
   319                              <1> ;	    (1) THE DRIVE NUMBER IS INVALID,
   320                              <1> ;	    (2) THE DRIVE TYPE IS UNKNOWN AND CMOS IS NOT PRESENT, 
   321                              <1> ;	    (3) THE DRIVE TYPE IS UNKNOWN AND CMOS IS BAD,
   322                              <1> ;	    (4) OR THE DRIVE TYPE IS UNKNOWN AND THE CMOS DRIVE TYPE IS INVALID
   323                              <1> ;	    THEN ES,AX,BX,CX,DH,DI=0 ; DL=NUMBER OF DRIVES. 
   324                              <1> ;	    IF NO DRIVES ARE PRESENT THEN: ES,AX,BX,CX,DX,DI=0.
   325                              <1> ;	    @DISKETTE_STATUS = 0 AND CY IS RESET.
   326                              <1> ;-------------------------------------------------------------------------------
   327                              <1> ;	(AH)= 15H  READ DASD TYPE
   328                              <1> ;	OUTPUT REGISTERS
   329                              <1> ;	(AH) - ON RETURN IF CARRY FLAG NOT SET, OTHERWISE ERROR	
   330                              <1> ;		00 - DRIVE NOT PRESENT	
   331                              <1> ;		01 - DISKETTE, NO CHANGE LINE AVAILABLE
   332                              <1> ;		02 - DISKETTE, CHANGE LINE AVAILABLE	
   333                              <1> ;		03 - RESERVED (FIXED DISK)
   334                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED)
   335                              <1> ;-------------------------------------------------------------------------------
   336                              <1> ;	(AH)= 16H  DISK CHANGE LINE STATUS
   337                              <1> ;	OUTPUT REGISTERS
   338                              <1> ;	(AH) - 00 - DISK CHANGE LINE NOT ACTIVE	
   339                              <1> ;	       06 - DISK CHANGE LINE ACTIVE & CARRY BIT ON
   340                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED)
   341                              <1> ;-------------------------------------------------------------------------------
   342                              <1> ;	(AH)= 17H  SET DASD TYPE FOR FORMAT
   343                              <1> ;	INPUT REGISTERS
   344                              <1> ;	(AL) -	00 - NOT USED	
   345                              <1> ;		01 - DISKETTE 320/360K IN 360K DRIVE	
   346                              <1> ;		02 - DISKETTE 360K IN 1.2M DRIVE
   347                              <1> ;		03 - DISKETTE 1.2M IN 1.2M DRIVE
   348                              <1> ;		04 - DISKETTE 720K IN 720K DRIVE
   349                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHECKED:
   350                              <1> ;	       (DO NOT USE WHEN DISKETTE ATTACH CARD USED)
   351                              <1> ;-------------------------------------------------------------------------------
   352                              <1> ;	(AH)= 18H  SET MEDIA TYPE FOR FORMAT
   353                              <1> ;	INPUT REGISTERS
   354                              <1> ;	(CH) - LOW ORDER 8 OF 10 BITS MAXIMUM TRACKS
   355                              <1> ;	(CL) - BITS 7 & 6 - HIGH ORDER TWO BITS OF MAXIMUM TRACKS
   356                              <1> ;	       BITS 5 THRU 0 - MAXIMUM SECTORS PER TRACK
   357                              <1> ;	(DL) - DRIVE NUMBER (0-1 ALLOWED, VALUE CHACKED)
   358                              <1> ;	OUTPUT REGISTERS:
   359                              <1> ;	(ES:DI) - POINTER TO DRIVE PARAMETERS TABLE FOR THIS MEDIA TYPE,
   360                              <1> ;		  UNCHANGED IF (AH) IS NON-ZERO
   361                              <1> ;	(AH) - 00H, CY = 0, TRACK AND SECTORS/TRACK COMBINATION IS SUPPORTED
   362                              <1> ;	     - 01H, CY = 1, FUNCTION IS NOT AVAILABLE
   363                              <1> ;	     - 0CH, CY = 1, TRACK AND SECTORS/TRACK COMBINATION IS NOT SUPPORTED
   364                              <1> ;	     - 80H, CY = 1, TIME OUT (DISKETTE NOT PRESENT)		
   365                              <1> ;-------------------------------------------------------------------------------
   366                              <1> ;	DISK CHANGE STATUS IS ONLY CHECKED WHEN A MEDIA SPECIFIED IS OTHER
   367                              <1> ;	THAN 360 KB DRIVE. IF THE DISK CHANGE LINE IS FOUND TO BE
   368                              <1> ;	ACTIVE THE FOLLOWING ACTIONS TAKE PLACE:
   369                              <1> ;		ATTEMPT TO RESET DISK CHANGE LINE TO INACTIVE STATE. 
   370                              <1> ;		IF ATTEMPT SUCCEEDS SET DASD TYPE FOR FORMAT AND RETURN DISK 
   371                              <1> ;		CHANGE ERROR CODE
   372                              <1> ;		IF ATTEMPT FAILS RETURN TIMEOUT ERROR CODE AND SET DASD TYPE 
   373                              <1> ;		TO A PREDETERMINED STATE INDICATING MEDIA TYPE UNKNOWN.
   374                              <1> ;	IF THE DISK CHANGE LINE IN INACTIVE PERFORM SET DASD TYPE FOR FORMAT.
   375                              <1> ;
   376                              <1> ; DATA VARIABLE -- @DISK_POINTER
   377                              <1> ;	DOUBLE WORD POINTER TO THE CURRENT SET OF DISKETTE PARAMETERS
   378                              <1> ;-------------------------------------------------------------------------------
   379                              <1> ; OUTPUT FOR ALL FUNCTIONS
   380                              <1> ;	AH = STATUS OF OPERATION
   381                              <1> ;		STATUS BITS ARE DEFINED IN THE EQUATES FOR @DISKETTE_STATUS
   382                              <1> ;		VARIABLE IN THE DATA SEGMENT OF THIS MODULE
   383                              <1> ;	CY = 0	SUCCESSFUL OPERATION (AH=0 ON RETURN, EXCEPT FOR READ DASD
   384                              <1> ;		TYPE AH=(15)).
   385                              <1> ;	CY = 1	FAILED OPERATION (AH HAS ERROR REASON)
   386                              <1> ;	FOR READ/WRITE/VERIFY
   387                              <1> ;		DS,BX,DX,CX PRESERVED
   388                              <1> ;	NOTE: IF AN ERROR IS REPORTED BY THE DISKETTE CODE, THE APPROPRIATE 
   389                              <1> ;		ACTION IS TO RESET THE DISKETTE, THEN RETRY THE OPERATION.
   390                              <1> ;		ON READ ACCESSES, NO MOTOR START DELAY IS TAKEN, SO THAT 
   391                              <1> ;		THREE RETRIES ARE REQUIRED ON READS TO ENSURE THAT THE 
   392                              <1> ;		PROBLEM IS NOT DUE TO MOTOR START-UP.
   393                              <1> ;-------------------------------------------------------------------------------
   394                              <1> ;
   395                              <1> ; DISKETTE STATE MACHINE - ABSOLUTE ADDRESS 40:90 (DRIVE A) & 91 (DRIVE B)
   396                              <1> ;
   397                              <1> ;   -----------------------------------------------------------------
   398                              <1> ;   |       |       |       |       |       |       |       |       |
   399                              <1> ;   |   7   |   6   |   5   |   4   |   3   |   2   |   1   |   0   |
   400                              <1> ;   |       |       |       |       |       |       |       |       |
   401                              <1> ;   -----------------------------------------------------------------
   402                              <1> ;	|	|	|	|	|	|	|	|
   403                              <1> ;	|	|	|	|	|	-----------------
   404                              <1> ;	|	|	|	|	|		|
   405                              <1> ;	|	|	|	|    RESERVED		|
   406                              <1> ;	|	|	|	|		  PRESENT STATE
   407                              <1> ;	|	|	|	|	000: 360K IN 360K DRIVE UNESTABLISHED
   408                              <1> ;	|	|	|	|	001: 360K IN 1.2M DRIVE UNESTABLISHED
   409                              <1> ;	|	|	|	|	010: 1.2M IN 1.2M DRIVE UNESTABLISHED
   410                              <1> ;	|	|	|	|	011: 360K IN 360K DRIVE ESTABLISHED
   411                              <1> ;	|	|	|	|	100: 360K IN 1.2M DRIVE ESTABLISHED
   412                              <1> ;	|	|	|	|	101: 1.2M IN 1.2M DRIVE ESTABLISHED
   413                              <1> ;	|	|	|	|	110: RESERVED
   414                              <1> ;	|	|	|	|	111: NONE OF THE ABOVE
   415                              <1> ;	|	|	|	|
   416                              <1> ;	|	|	|	------>	MEDIA/DRIVE ESTABLISHED
   417                              <1> ;	|	|	|
   418                              <1> ;	|	|	-------------->	DOUBLE STEPPING REQUIRED (360K IN 1.2M
   419                              <1> ;	|	|			DRIVE)
   420                              <1> ;	|	|
   421                              <1> ;	------------------------------>	DATA TRANSFER RATE FOR THIS DRIVE:
   422                              <1> ;
   423                              <1> ;						00: 500 KBS
   424                              <1> ;						01: 300 KBS
   425                              <1> ;						10: 250 KBS
   426                              <1> ;						11: RESERVED
   427                              <1> ;
   428                              <1> ;
   429                              <1> ;-------------------------------------------------------------------------------
   430                              <1> ; STATE OPERATION STARTED - ABSOLUTE ADDRESS 40:92 (DRIVE A) & 93 (DRIVE B)
   431                              <1> ;-------------------------------------------------------------------------------
   432                              <1> ; PRESENT CYLINDER NUMBER - ABSOLUTE ADDRESS 40:94 (DRIVE A) & 95 (DRIVE B)
   433                              <1> ;-------------------------------------------------------------------------------
   434                              <1> 
   435                              <1> struc MD
   436 00000000 <res 00000001>      <1> 	.SPEC1		resb	1	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   437 00000001 <res 00000001>      <1> 	.SPEC2		resb	1	; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   438 00000002 <res 00000001>      <1> 	.OFF_TIM	resb	1	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   439 00000003 <res 00000001>      <1> 	.BYT_SEC	resb	1	; 512 BYTES/SECTOR
   440 00000004 <res 00000001>      <1> 	.SEC_TRK	resb	1	; EOT (LAST SECTOR ON TRACK)
   441 00000005 <res 00000001>      <1> 	.GAP		resb	1	; GAP LENGTH
   442 00000006 <res 00000001>      <1> 	.DTL		resb	1	; DTL
   443 00000007 <res 00000001>      <1> 	.GAP3		resb	1	; GAP LENGTH FOR FORMAT
   444 00000008 <res 00000001>      <1> 	.FIL_BYT	resb	1	; FILL BYTE FOR FORMAT
   445 00000009 <res 00000001>      <1> 	.HD_TIM		resb	1	; HEAD SETTLE TIME (MILLISECONDS)
   446 0000000A <res 00000001>      <1> 	.STR_TIM	resb	1	; MOTOR START TIME (1/8 SECONDS)
   447 0000000B <res 00000001>      <1> 	.MAX_TRK	resb	1	; MAX. TRACK NUMBER
   448 0000000C <res 00000001>      <1> 	.RATE		resb	1	; DATA TRANSFER RATE
   449                              <1> endstruc
   450                              <1> 
   451                              <1> BIT7OFF	EQU	7FH
   452                              <1> BIT7ON	EQU	80H
   453                              <1> 
   454                              <1> ; 30/08/2020 - TRDOS 386 v2
   455                              <1> 
   456                              <1> ;;int13h: ; 16/02/2015
   457                              <1> ;; 16/02/2015 - 21/02/2015
   458                              <1> int40h:
   459 0000337D 9C                  <1> 	pushfd
   460 0000337E 0E                  <1> 	push 	cs
   461 0000337F E801000000          <1> 	call 	DISKETTE_IO_1
   462 00003384 C3                  <1> 	retn	
   463                              <1> 
   464                              <1> DISKETTE_IO_1:
   465                              <1> 
   466 00003385 FB                  <1> 	STI				; INTERRUPTS BACK ON
   467 00003386 55                  <1> 	PUSH	eBP			; USER REGISTER
   468 00003387 57                  <1> 	PUSH	eDI			; USER REGISTER
   469 00003388 52                  <1> 	PUSH	eDX			; HEAD #, DRIVE # OR USER REGISTER
   470 00003389 53                  <1> 	PUSH	eBX			; BUFFER OFFSET PARAMETER OR REGISTER
   471 0000338A 51                  <1> 	PUSH	eCX			; TRACK #-SECTOR # OR USER REGISTER
   472 0000338B 89E5                <1> 	MOV	eBP,eSP			; BP     => PARAMETER LIST DEP. ON AH
   473                              <1> 					; [BP]   = SECTOR #
   474                              <1> 					; [BP+1] = TRACK #
   475                              <1> 					; [BP+2] = BUFFER OFFSET
   476                              <1> 					; FOR RETURN OF DRIVE PARAMETERS:
   477                              <1> 					; CL/[BP] = BITS 7&6 HI BITS OF MAX CYL
   478                              <1> 					; 	    BITS 0-5 MAX SECTORS/TRACK
   479                              <1> 					; CH/[BP+1] = LOW 8 BITS OF MAX CYL.
   480                              <1> 					; BL/[BP+2] = BITS 7-4 = 0
   481                              <1> 					;	      BITS 3-0 = VALID CMOS TYPE
   482                              <1> 					; BH/[BP+3] = 0
   483                              <1> 					; DL/[BP+4] = # DRIVES INSTALLED
   484                              <1> 					; DH/[BP+5] = MAX HEAD #
   485                              <1> 					; DI/[BP+6] = OFFSET TO DISK BASE
   486 0000338D 06                  <1> 	push	es ; 06/02/2015	
   487 0000338E 1E                  <1> 	PUSH	DS			; BUFFER SEGMENT PARM OR USER REGISTER
   488 0000338F 56                  <1> 	PUSH	eSI			; USER REGISTERS
   489                              <1> 	;CALL	DDS			; SEGMENT OF BIOS DATA AREA TO DS
   490                              <1> 	;mov	cx, cs
   491                              <1> 	;mov	ds, cx
   492 00003390 66B91000            <1> 	mov	cx, KDATA
   493 00003394 8ED9                <1>         mov     ds, cx
   494 00003396 8EC1                <1>         mov     es, cx
   495                              <1> 
   496                              <1> 	;CMP	AH,(FNC_TAE-FNC_TAB)/2	; CHECK FOR > LARGEST FUNCTION
   497 00003398 80FC19              <1> 	cmp	ah,(FNC_TAE-FNC_TAB)/4  ; 18/02/2015
   498 0000339B 7202                <1> 	JB	short OK_FUNC		; FUNCTION OK
   499 0000339D B414                <1> 	MOV	AH,14H			; REPLACE WITH KNOWN INVALID FUNCTION
   500                              <1> OK_FUNC:
   501 0000339F 80FC01              <1> 	CMP	AH,1			; RESET OR STATUS ?
   502 000033A2 760C                <1> 	JBE	short OK_DRV		; IF RESET OR STATUS DRIVE ALWAYS OK
   503 000033A4 80FC08              <1> 	CMP	AH,8			; READ DRIVE PARMS ?
   504 000033A7 7407                <1> 	JZ	short OK_DRV		; IF SO DRIVE CHECKED LATER
   505 000033A9 80FA01              <1> 	CMP	DL,1			; DRIVES 0 AND 1 OK
   506 000033AC 7602                <1> 	JBE	short OK_DRV		; IF 0 OR 1 THEN JUMP
   507 000033AE B414                <1> 	MOV	AH,14H			; REPLACE WITH KNOWN INVALID FUNCTION
   508                              <1> OK_DRV:
   509 000033B0 31C9                <1> 	xor	ecx, ecx
   510                              <1> 	;mov	esi, ecx ; 08/02/2015
   511 000033B2 89CF                <1> 	mov	edi, ecx ; 08/02/2015
   512 000033B4 88E1                <1> 	MOV	CL,AH			; CL = FUNCTION
   513                              <1> 	;XOR	CH,CH			; CX = FUNCTION
   514                              <1> 	;SHL	CL, 1			; FUNCTION TIMES 2
   515 000033B6 C0E102              <1> 	SHL	CL, 2 ; 20/02/2015	; FUNCTION TIMES 4 (for 32 bit offset)
   516 000033B9 BB[F1330000]        <1> 	MOV	eBX,FNC_TAB		; LOAD START OF FUNCTION TABLE
   517 000033BE 01CB                <1> 	ADD	eBX,eCX			; ADD OFFSET INTO TABLE => ROUTINE
   518 000033C0 88F4                <1> 	MOV	AH,DH			; AX = HEAD #,# OF SECTORS OR DASD TYPE
   519 000033C2 30F6                <1> 	XOR	DH,DH			; DX = DRIVE #
   520 000033C4 6689C6              <1> 	MOV	SI,AX			; SI = HEAD #,# OF SECTORS OR DASD TYPE
   521 000033C7 6689D7              <1> 	MOV     DI,DX                   ; DI = DRIVE #
   522                              <1> 	;
   523                              <1> 	; 11/12/2014
   524 000033CA 8815[455D0000]      <1>         mov     [cfd], dl               ; current floppy drive (for 'GET_PARM')        
   525                              <1> 	;
   526 000033D0 8A25[48590100]      <1> 	MOV	AH, [DSKETTE_STATUS]	; LOAD STATUS TO AH FOR STATUS FUNCTION
   527 000033D6 C605[48590100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; INITIALIZE FOR ALL OTHERS
   528                              <1> 
   529                              <1> ;	THROUGHOUT THE DISKETTE BIOS, THE FOLLOWING INFORMATION IS CONTAINED IN
   530                              <1> ;	THE FOLLOWING MEMORY LOCATIONS AND REGISTERS. NOT ALL DISKETTE BIOS
   531                              <1> ;	FUNCTIONS REQUIRE ALL OF THESE PARAMETERS.
   532                              <1> ;
   533                              <1> ;		DI	: DRIVE #
   534                              <1> ;		SI-HI	: HEAD #
   535                              <1> ;		SI-LOW	: # OF SECTORS OR DASD TYPE FOR FORMAT
   536                              <1> ;		ES	: BUFFER SEGMENT
   537                              <1> ;		[BP]	: SECTOR #
   538                              <1> ;		[BP+1]	: TRACK #
   539                              <1> ;		[BP+2]	: BUFFER OFFSET
   540                              <1> ;
   541                              <1> ;	ACROSS CALLS TO SUBROUTINES THE CARRY FLAG (CY=1), WHERE INDICATED IN 
   542                              <1> ;	SUBROUTINE PROLOGUES, REPRESENTS AN EXCEPTION RETURN (NORMALLY AN ERROR 
   543                              <1> ;	CONDITION). IN MOST CASES, WHEN CY = 1, @DSKETTE_STATUS CONTAINS THE 
   544                              <1> ;	SPECIFIC ERROR CODE.
   545                              <1> ;
   546                              <1> 					; (AH) = @DSKETTE_STATUS
   547 000033DD FF13                <1> 	CALL	dWORD [eBX]		; CALL THE REQUESTED FUNCTION
   548 000033DF 5E                  <1> 	POP	eSI			; RESTORE ALL REGISTERS
   549 000033E0 1F                  <1> 	POP	DS
   550 000033E1 07                  <1> 	pop	es	; 06/02/2015
   551 000033E2 59                  <1> 	POP	eCX
   552 000033E3 5B                  <1> 	POP	eBX
   553 000033E4 5A                  <1> 	POP	eDX
   554 000033E5 5F                  <1> 	POP	eDI
   555 000033E6 89E5                <1> 	MOV	eBP, eSP
   556 000033E8 50                  <1> 	PUSH	eAX
   557 000033E9 9C                  <1> 	PUSHFd
   558 000033EA 58                  <1> 	POP	eAX
   559                              <1> 	;MOV	[BP+6], AX
   560 000033EB 89450C              <1> 	mov	[ebp+12], eax  ; 18/02/2015, flags
   561 000033EE 58                  <1> 	POP	eAX
   562 000033EF 5D                  <1> 	POP	eBP
   563 000033F0 CF                  <1> 	IRETd
   564                              <1> 
   565                              <1> ;-------------------------------------------------------------------------------
   566                              <1> ; DW --> dd (06/02/2015)
   567 000033F1 [55340000]          <1> FNC_TAB	dd	DSK_RESET		; AH = 00H; RESET
   568 000033F5 [CE340000]          <1> 	dd	DSK_STATUS		; AH = 01H; STATUS
   569 000033F9 [DF340000]          <1> 	dd	DSK_READ		; AH = 02H; READ
   570 000033FD [F0340000]          <1> 	dd	DSK_WRITE		; AH = 03H; WRITE
   571 00003401 [01350000]          <1> 	dd	DSK_VERF		; AH = 04H; VERIFY
   572 00003405 [12350000]          <1> 	dd	DSK_FORMAT		; AH = 05H; FORMAT
   573 00003409 [97350000]          <1> 	dd	FNC_ERR			; AH = 06H; INVALID
   574 0000340D [97350000]          <1> 	dd	FNC_ERR			; AH = 07H; INVALID
   575 00003411 [A4350000]          <1> 	dd	DSK_PARMS		; AH = 08H; READ DRIVE PARAMETERS
   576 00003415 [97350000]          <1> 	dd	FNC_ERR			; AH = 09H; INVALID
   577 00003419 [97350000]          <1> 	dd	FNC_ERR			; AH = 0AH; INVALID
   578 0000341D [97350000]          <1> 	dd	FNC_ERR			; AH = 0BH; INVALID
   579 00003421 [97350000]          <1> 	dd	FNC_ERR			; AH = 0CH; INVALID
   580 00003425 [97350000]          <1> 	dd	FNC_ERR			; AH = 0DH; INVALID
   581 00003429 [97350000]          <1> 	dd	FNC_ERR			; AH = 0EH; INVALID
   582 0000342D [97350000]          <1> 	dd	FNC_ERR			; AH = 0FH; INVALID
   583 00003431 [97350000]          <1> 	dd	FNC_ERR			; AH = 10H; INVALID
   584 00003435 [97350000]          <1> 	dd	FNC_ERR			; AH = 11H; INVALID
   585 00003439 [97350000]          <1> 	dd	FNC_ERR			; AH = 12H; INVALID
   586 0000343D [97350000]          <1> 	dd	FNC_ERR			; AH = 13H; INVALID
   587 00003441 [97350000]          <1> 	dd	FNC_ERR			; AH = 14H; INVALID
   588 00003445 [94360000]          <1> 	dd	DSK_TYPE		; AH = 15H; READ DASD TYPE
   589 00003449 [C4360000]          <1> 	dd	DSK_CHANGE		; AH = 16H; CHANGE STATUS
   590 0000344D [FE360000]          <1> 	dd	FORMAT_SET		; AH = 17H; SET DASD TYPE
   591 00003451 [81370000]          <1> 	dd	SET_MEDIA		; AH = 18H; SET MEDIA TYPE	
   592                              <1> FNC_TAE EQU     $                       ; END
   593                              <1> 
   594                              <1> ;-------------------------------------------------------------------------------
   595                              <1> ; DISK_RESET	(AH = 00H)	
   596                              <1> ;		RESET THE DISKETTE SYSTEM.
   597                              <1> ;
   598                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   599                              <1> ;-------------------------------------------------------------------------------
   600                              <1> DSK_RESET:
   601 00003455 66BAF203            <1> 	MOV	DX,03F2H		; ADAPTER CONTROL PORT
   602 00003459 FA                  <1> 	CLI				; NO INTERRUPTS
   603 0000345A A0[46590100]        <1> 	MOV	AL,[MOTOR_STATUS]	; GET DIGITAL OUTPUT REGISTER REFLECTION
   604 0000345F 243F                <1> 	AND	AL,00111111B		; KEEP SELECTED AND MOTOR ON BITS
   605 00003461 C0C004              <1> 	ROL	AL,4			; MOTOR VALUE TO HIGH NIBBLE
   606                              <1> 					; DRIVE SELECT TO LOW NIBBLE
   607 00003464 0C08                <1> 	OR	AL,00001000B		; TURN ON INTERRUPT ENABLE
   608 00003466 EE                  <1> 	OUT	DX,AL			; RESET THE ADAPTER
   609 00003467 C605[45590100]00    <1> 	MOV	byte [SEEK_STATUS],0	; SET RECALIBRATE REQUIRED ON ALL DRIVES
   610                              <1> 	;JMP	$+2			; WAIT FOR I/O
   611                              <1> 	;JMP	$+2			; WAIT FOR I/O (TO INSURE MINIMUM
   612                              <1> 					;      PULSE WIDTH)
   613                              <1> 	; 19/12/2014
   614                              <1> 	NEWIODELAY
   614 0000346E E6EB                <2>  out 0ebh,al
   615                              <1> 
   616                              <1> 	; 17/12/2014 
   617                              <1> 	; AWARD BIOS 1999 - RESETDRIVES (ADISK.ASM)
   618 00003470 B915000000          <1> 	mov	ecx, WAITCPU_RESET_ON	; cx = 21 -- Min. 14 micro seconds !?
   619                              <1> wdw1:
   620                              <1> 	NEWIODELAY   ; 27/02/2015
   620 00003475 E6EB                <2>  out 0ebh,al
   621 00003477 E2FC                <1> 	loop	wdw1
   622                              <1> 	;
   623 00003479 0C04                <1> 	OR	AL,00000100B		; TURN OFF RESET BIT
   624 0000347B EE                  <1> 	OUT	DX,AL			; RESET THE ADAPTER
   625                              <1> 	; 16/12/2014
   626                              <1> 	IODELAY
   626 0000347C EB00                <2>  jmp short $+2
   626 0000347E EB00                <2>  jmp short $+2
   627                              <1> 	;
   628                              <1> 	;STI				; ENABLE THE INTERRUPTS
   629 00003480 E8590C0000          <1> 	CALL	WAIT_INT		; WAIT FOR THE INTERRUPT
   630 00003485 723E                <1> 	JC	short DR_ERR		; IF ERROR, RETURN IT
   631 00003487 66B9C000            <1> 	MOV	CX,11000000B		; CL = EXPECTED @NEC_STATUS
   632                              <1> NXT_DRV:
   633 0000348B 6651                <1> 	PUSH	CX			; SAVE FOR CALL
   634 0000348D B8[C3340000]        <1> 	MOV	eAX, DR_POP_ERR 	; LOAD NEC_OUTPUT ERROR ADDRESS
   635 00003492 50                  <1> 	PUSH	eAX			; "
   636 00003493 B408                <1> 	MOV	AH,08H			; SENSE INTERRUPT STATUS COMMAND
   637 00003495 E8370B0000          <1> 	CALL	NEC_OUTPUT
   638 0000349A 58                  <1> 	POP	eAX			; THROW AWAY ERROR RETURN
   639 0000349B E86E0C0000          <1> 	CALL	RESULTS			; READ IN THE RESULTS
   640 000034A0 6659                <1> 	POP	CX			; RESTORE AFTER CALL
   641 000034A2 7221                <1> 	JC	short DR_ERR		; ERROR RETURN
   642 000034A4 3A0D[49590100]      <1> 	CMP	CL, [NEC_STATUS]	; TEST FOR DRIVE READY TRANSITION
   643 000034AA 7519                <1> 	JNZ	short DR_ERR		; EVERYTHING OK
   644 000034AC FEC1                <1> 	INC	CL			; NEXT EXPECTED @NEC_STATUS
   645 000034AE 80F9C3              <1> 	CMP	CL,11000011B		; ALL POSSIBLE DRIVES CLEARED
   646 000034B1 76D8                <1> 	JBE	short NXT_DRV		; FALL THRU IF 11000100B OR >
   647                              <1> 	;
   648 000034B3 E886030000          <1> 	CALL	SEND_SPEC		; SEND SPECIFY COMMAND TO NEC
   649                              <1> RESBAC:
   650 000034B8 E83A090000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
   651 000034BD 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   652 000034C0 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   653 000034C2 C3                  <1> 	RETn		
   654                              <1> DR_POP_ERR:
   655 000034C3 6659                <1> 	POP	CX			; CLEAR STACK
   656                              <1> DR_ERR:
   657 000034C5 800D[48590100]20    <1> 	OR	byte [DSKETTE_STATUS],BAD_NEC ; SET ERROR CODE
   658 000034CC EBEA                <1> 	JMP	SHORT RESBAC		; RETURN FROM RESET
   659                              <1> 
   660                              <1> ;-------------------------------------------------------------------------------
   661                              <1> ; DISK_STATUS	(AH = 01H)
   662                              <1> ;	DISKETTE STATUS.
   663                              <1> ;
   664                              <1> ; ON ENTRY:	AH : STATUS OF PREVIOUS OPERATION
   665                              <1> ;
   666                              <1> ; ON EXIT:	AH, @DSKETTE_STATUS, CY REFLECT STATUS OF PREVIOUS OPERATION.
   667                              <1> ;-------------------------------------------------------------------------------
   668                              <1> DSK_STATUS:
   669 000034CE 8825[48590100]      <1> 	MOV	[DSKETTE_STATUS],AH	; PUT BACK FOR SETUP END
   670 000034D4 E81E090000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
   671 000034D9 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   672 000034DC 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   673 000034DE C3                  <1> 	RETn		
   674                              <1> 
   675                              <1> ;-------------------------------------------------------------------------------
   676                              <1> ; DISK_READ	(AH = 02H)	
   677                              <1> ;	DISKETTE READ.
   678                              <1> ;
   679                              <1> ; ON ENTRY:	DI	: DRIVE #
   680                              <1> ;		SI-HI	: HEAD #
   681                              <1> ;		SI-LOW	: # OF SECTORS
   682                              <1> ;		ES	: BUFFER SEGMENT
   683                              <1> ;		[BP]	: SECTOR #
   684                              <1> ;		[BP+1]	: TRACK #
   685                              <1> ;		[BP+2]	: BUFFER OFFSET
   686                              <1> ;
   687                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   688                              <1> ;-------------------------------------------------------------------------------
   689                              <1> 
   690                              <1> ; 06/02/2015, ES:BX -> EBX (unix386.s)
   691                              <1> 
   692                              <1> DSK_READ:
   693 000034DF 8025[46590100]7F    <1> 	AND	byte [MOTOR_STATUS],01111111B ; INDICATE A READ OPERATION
   694 000034E6 66B846E6            <1> 	MOV	AX,0E646H		; AX = NEC COMMAND, DMA COMMAND
   695 000034EA E859040000          <1> 	CALL	RD_WR_VF		; COMMON READ/WRITE/VERIFY
   696 000034EF C3                  <1> 	RETn
   697                              <1> 
   698                              <1> ;-------------------------------------------------------------------------------
   699                              <1> ; DISK_WRITE	(AH = 03H)
   700                              <1> ;	DISKETTE WRITE.
   701                              <1> ;
   702                              <1> ; ON ENTRY:	DI	: DRIVE #
   703                              <1> ;		SI-HI	: HEAD #
   704                              <1> ;		SI-LOW	: # OF SECTORS
   705                              <1> ;		ES	: BUFFER SEGMENT
   706                              <1> ;		[BP]	: SECTOR #
   707                              <1> ;		[BP+1]	: TRACK #
   708                              <1> ;		[BP+2]	: BUFFER OFFSET
   709                              <1> ;
   710                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   711                              <1> ;-------------------------------------------------------------------------------
   712                              <1> 
   713                              <1> ; 06/02/2015, ES:BX -> EBX (unix386.s)
   714                              <1> 
   715                              <1> DSK_WRITE:
   716 000034F0 66B84AC5            <1> 	MOV	AX,0C54AH		; AX = NEC COMMAND, DMA COMMAND
   717 000034F4 800D[46590100]80    <1>         OR      byte [MOTOR_STATUS],10000000B ; INDICATE WRITE OPERATION
   718 000034FB E848040000          <1> 	CALL	RD_WR_VF		; COMMON READ/WRITE/VERIFY
   719 00003500 C3                  <1> 	RETn
   720                              <1> 
   721                              <1> ;-------------------------------------------------------------------------------
   722                              <1> ; DISK_VERF	(AH = 04H)
   723                              <1> ;	DISKETTE VERIFY.
   724                              <1> ;
   725                              <1> ; ON ENTRY:	DI	: DRIVE #
   726                              <1> ;		SI-HI	: HEAD #
   727                              <1> ;		SI-LOW	: # OF SECTORS
   728                              <1> ;		ES	: BUFFER SEGMENT
   729                              <1> ;		[BP]	: SECTOR #
   730                              <1> ;		[BP+1]	: TRACK #
   731                              <1> ;		[BP+2]	: BUFFER OFFSET
   732                              <1> ;
   733                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   734                              <1> ;-------------------------------------------------------------------------------
   735                              <1> DSK_VERF:
   736 00003501 8025[46590100]7F    <1> 	AND	byte [MOTOR_STATUS],01111111B ; INDICATE A READ OPERATION
   737 00003508 66B842E6            <1> 	MOV	AX,0E642H		; AX = NEC COMMAND, DMA COMMAND
   738 0000350C E837040000          <1> 	CALL	RD_WR_VF		; COMMON READ/WRITE/VERIFY
   739 00003511 C3                  <1> 	RETn
   740                              <1> 
   741                              <1> ;-------------------------------------------------------------------------------
   742                              <1> ; DISK_FORMAT	(AH = 05H)
   743                              <1> ;	DISKETTE FORMAT.
   744                              <1> ;
   745                              <1> ; ON ENTRY:	DI	: DRIVE #
   746                              <1> ;		SI-HI	: HEAD #
   747                              <1> ;		SI-LOW	: # OF SECTORS
   748                              <1> ;		ES	: BUFFER SEGMENT
   749                              <1> ;		[BP]	: SECTOR #
   750                              <1> ;		[BP+1]	: TRACK #
   751                              <1> ;		[BP+2]	: BUFFER OFFSET
   752                              <1> ;		@DISK_POINTER POINTS TO THE PARAMETER TABLE OF THIS DRIVE
   753                              <1> ;
   754                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   755                              <1> ;-------------------------------------------------------------------------------
   756                              <1> DSK_FORMAT:
   757 00003512 E870030000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
   758 00003517 E86C050000          <1> 	CALL	FMT_INIT		; ESTABLISH STATE IF UNESTABLISHED
   759 0000351C 800D[46590100]80    <1>         OR      byte [MOTOR_STATUS], 10000000B ; INDICATE WRITE OPERATION
   760 00003523 E8B4050000          <1> 	CALL	MED_CHANGE		; CHECK MEDIA CHANGE AND RESET IF SO
   761 00003528 725D                <1>         JC      short FM_DON            ; MEDIA CHANGED, SKIP
   762 0000352A E80F030000          <1> 	CALL	SEND_SPEC		; SEND SPECIFY COMMAND TO NEC
   763 0000352F E81A060000          <1> 	CALL	CHK_LASTRATE		; ZF=1 ATTEMPT RATE IS SAME AS LAST RATE
   764 00003534 7405                <1>         JZ      short FM_WR             ; YES, SKIP SPECIFY COMMAND
   765 00003536 E8F1050000          <1> 	CALL	SEND_RATE		; SEND DATA RATE TO CONTROLLER
   766                              <1> FM_WR:
   767 0000353B E8A7060000          <1> 	CALL	FMTDMA_SET		; SET UP THE DMA FOR FORMAT
   768 00003540 7245                <1>         JC      short FM_DON            ; RETURN WITH ERROR
   769 00003542 B44D                <1> 	MOV	AH,04DH			; ESTABLISH THE FORMAT COMMAND
   770 00003544 E804070000          <1> 	CALL	NEC_INIT		; INITIALIZE THE NEC
   771 00003549 723C                <1>         JC      short FM_DON            ; ERROR - EXIT
   772 0000354B B8[87350000]        <1>         MOV     eAX, FM_DON             ; LOAD ERROR ADDRESS
   773 00003550 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
   774 00003551 B203                <1> 	MOV	DL,3			; BYTES/SECTOR VALUE TO NEC
   775 00003553 E873090000          <1> 	CALL	GET_PARM
   776 00003558 E8740A0000          <1> 	CALL	NEC_OUTPUT
   777 0000355D B204                <1> 	MOV	DL,4			; SECTORS/TRACK VALUE TO NEC
   778 0000355F E867090000          <1> 	CALL	GET_PARM
   779 00003564 E8680A0000          <1> 	CALL	NEC_OUTPUT
   780 00003569 B207                <1> 	MOV	DL,7			; GAP LENGTH VALUE TO NEC
   781 0000356B E85B090000          <1> 	CALL	GET_PARM
   782 00003570 E85C0A0000          <1> 	CALL	NEC_OUTPUT
   783 00003575 B208                <1> 	MOV	DL,8			; FILLER BYTE TO NEC
   784 00003577 E84F090000          <1> 	CALL	GET_PARM
   785 0000357C E8500A0000          <1> 	CALL	NEC_OUTPUT
   786 00003581 58                  <1> 	POP	eAX			; THROW AWAY ERROR
   787 00003582 E844070000          <1> 	CALL	NEC_TERM		; TERMINATE, RECEIVE STATUS, ETC,
   788                              <1> FM_DON:
   789 00003587 E82C030000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
   790 0000358C E866080000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
   791 00003591 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
   792 00003594 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
   793 00003596 C3                  <1> 	RETn
   794                              <1> 
   795                              <1> ;-------------------------------------------------------------------------------
   796                              <1> ; FNC_ERR
   797                              <1> ;	INVALID FUNCTION REQUESTED OR INVALID DRIVE: 
   798                              <1> ;	SET BAD COMMAND IN STATUS.
   799                              <1> ;
   800                              <1> ; ON EXIT: 	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
   801                              <1> ;-------------------------------------------------------------------------------
   802                              <1> FNC_ERR:				; INVALID FUNCTION REQUEST
   803 00003597 6689F0              <1> 	MOV	AX,SI			; RESTORE AL
   804 0000359A B401                <1> 	MOV	AH,BAD_CMD		; SET BAD COMMAND ERROR
   805 0000359C 8825[48590100]      <1> 	MOV	[DSKETTE_STATUS],AH	; STORE IN DATA AREA
   806 000035A2 F9                  <1> 	STC				; SET CARRY INDICATING ERROR
   807 000035A3 C3                  <1> 	RETn
   808                              <1> 
   809                              <1> ; 30/08/2020
   810                              <1> ; 29/08/2020
   811                              <1> ; 01/06/2016
   812                              <1> ; 28/05/2016
   813                              <1> ; 27/05/2016 - TRDOS 386 (TRDOS v.2.0)
   814                              <1> ;-------------------------------------------------------------------------------
   815                              <1> ; DISK_PARMS	(AH = 08H)	
   816                              <1> ;	READ DRIVE PARAMETERS.
   817                              <1> ;
   818                              <1> ; ON ENTRY:	DI : DRIVE #
   819                              <1> ;		; 27/05/2016
   820                              <1> ;		EBX = Buffer Address for floppy disk parameters table (16 bytes)
   821                              <1> ;
   822                              <1> ; ON EXIT:	CL/[BP]   = BITS 7 & 6 HI 2 BITS OF MAX CYLINDER
   823                              <1> ;		            BITS 0-5 MAX SECTORS/TRACK
   824                              <1> ;		CH/[BP+1] = LOW 8 BITS OF MAX CYLINDER
   825                              <1> ;		BL/[BP+2] = BITS 7-4 = 0
   826                              <1> ;		            BITS 3-0 = VALID CMOS DRIVE TYPE
   827                              <1> ;		BH/[BP+3] = 0
   828                              <1> ;		DL/[BP+4] = # DRIVES INSTALLED (VALUE CHECKED)
   829                              <1> ;		DH/[BP+5] = MAX HEAD #
   830                              <1> ;	     ** 27/05/2016 - TRDOS 386 (TRDOS v2.0) **	
   831                              <1> ;            ** EBX = Buffer address for floppy disk parameters table **
   832                              <1> ;		;DI/[BP+6] = OFFSET TO DISK_BASE
   833                              <1> ;		;ES        = SEGMENT OF DISK_BASE
   834                              <1> ;
   835                              <1> ;		AX        = 0
   836                              <1> ;
   837                              <1> ;		NOTE : THE ABOVE INFORMATION IS STORED IN THE USERS STACK AT
   838                              <1> ;		       THE LOCATIONS WHERE THE MAIN ROUTINE WILL POP THEM
   839                              <1> ;		       INTO THE APPROPRIATE REGISTERS BEFORE RETURNING TO THE
   840                              <1> ;		       CALLER.
   841                              <1> ;-------------------------------------------------------------------------------
   842                              <1> DSK_PARMS:
   843 000035A4 E8DE020000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH,
   844                              <1>      ;	MOV	WORD [BP+2],0		; DRIVE TYPE = 0
   845                              <1>      ;  MOV     AX, [EQUIP_FLAG]        ; LOAD EQUIPMENT FLAG FOR # DISKETTES
   846                              <1>      ;  AND     AL,11000001B            ; KEEP DISKETTE DRIVE BITS
   847                              <1>      ;  MOV     DL,2                    ; DISKETTE DRIVES = 2
   848                              <1>      ;  CMP     AL,01000001B            ; 2 DRIVES INSTALLED ?
   849                              <1>      ;  JZ      short STO_DL            ; IF YES JUMP
   850                              <1>      ;  DEC     DL                      ; DISKETTE DRIVES = 1
   851                              <1>      ;  CMP     AL,00000001B            ; 1 DRIVE INSTALLED ?
   852                              <1>      ;  JNZ     short NON_DRV           ; IF NO JUMP
   853 000035A9 29D2                <1> 	sub	edx, edx
   854 000035AB 66A1[565D0000]      <1> 	mov     ax, [fd0_type]
   855 000035B1 6621C0              <1> 	and     ax, ax
   856 000035B4 0F849B000000        <1>         jz      NON_DRV
   857 000035BA FEC2                <1> 	inc     dl
   858 000035BC 20E4                <1> 	and     ah, ah
   859 000035BE 7402                <1> 	jz      short STO_DL
   860 000035C0 FEC2                <1> 	inc     dl
   861                              <1> STO_DL:
   862                              <1> 	; 30/08/2020
   863 000035C2 6639FA              <1> 	cmp	dx, di
   864 000035C5 0F868A000000        <1> 	jna	NON_DRV
   865                              <1> 	;
   866                              <1> 	;MOV	[BP+4],DL		; STORE NUMBER OF DRIVES
   867 000035CB 895508              <1> 	mov	[ebp+8], edx ; 20/02/2015	 	
   868 000035CE 6683FF01            <1> 	CMP	DI,1			; CHECK FOR VALID DRIVE
   869                              <1> 	;JA	short NON_DRV1		; DRIVE INVALID
   870 000035D2 0F8780000000        <1> 	ja	NON_DRV1 ; 29/08/2020
   871                              <1> 	;MOV	BYTE [BP+5],1		; MAXIMUM HEAD NUMBER =	1
   872 000035D8 C6450901            <1> 	mov	byte [ebp+9], 1  ; 20/02/2015	
   873 000035DC E8E1080000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN AL
   874                              <1> 	;;20/02/2015
   875                              <1> 	;;JC	short CHK_EST		; IF CMOS BAD CHECKSUM ESTABLISHED
   876                              <1> 	;;OR	AL,AL			; TEST FOR NO DRIVE TYPE
   877 000035E1 740F                <1> 	JZ	short CHK_EST		; JUMP IF SO
   878 000035E3 E82B020000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   879 000035E8 7208                <1> 	JC	short CHK_EST		; TYPE NOT IN TABLE (POSSIBLE BAD CMOS)
   880                              <1> 	;MOV	[BP+2],AL		; STORE VALID CMOS DRIVE TYPE
   881                              <1>         ;mov	[ebp+4], al ; 06/02/2015
   882 000035EA 8A4B04              <1> 	MOV     CL, [eBX+MD.SEC_TRK]     ; GET SECTOR/TRACK
   883 000035ED 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]     ; GET MAX. TRACK NUMBER
   884 000035F0 EB36                <1> 	JMP	SHORT STO_CX		; CMOS GOOD, USE CMOS
   885                              <1> CHK_EST:
   886 000035F2 8AA7[55590100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; LOAD STATE FOR THIS DRIVE
   887 000035F8 F6C410              <1> 	TEST	AH,MED_DET		; CHECK FOR ESTABLISHED STATE
   888 000035FB 745B                <1> 	JZ	short NON_DRV1		; CMOS BAD/INVALID OR UNESTABLISHED
   889                              <1> USE_EST:
   890 000035FD 80E4C0              <1> 	AND	AH,RATE_MSK		; ISOLATE STATE
   891 00003600 80FC80              <1> 	CMP	AH,RATE_250		; RATE 250 ?
   892 00003603 757B                <1> 	JNE	short USE_EST2		; NO, GO CHECK OTHER RATE
   893                              <1> 
   894                              <1> ;-----	DATA RATE IS 250 KBS, TRY 360 KB TABLE FIRST
   895                              <1> 
   896 00003605 B001                <1> 	MOV	AL,01			; DRIVE TYPE 1 (360KB)
   897 00003607 E807020000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   898 0000360C 8A4B04              <1>         MOV     CL, [eBX+MD.SEC_TRK]    ; GET SECTOR/TRACK
   899 0000360F 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]    ; GET MAX. TRACK NUMBER
   900 00003612 F687[55590100]01    <1> 	TEST	byte [DSK_STATE+eDI],TRK_CAPA ; 80 TRACK ?
   901 00003619 740D                <1> 	JZ	short STO_CX		; MUST BE 360KB DRIVE 
   902                              <1> 
   903                              <1> ;-----	IT IS 1.44 MB DRIVE
   904                              <1> 
   905                              <1> PARM144:
   906 0000361B B004                <1> 	MOV	AL,04			; DRIVE TYPE 4 (1.44MB)
   907 0000361D E8F1010000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   908 00003622 8A4B04              <1>         MOV     CL, [eBX+MD.SEC_TRK]    ; GET SECTOR/TRACK
   909 00003625 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]    ; GET MAX. TRACK NUMBER
   910                              <1> STO_CX:
   911 00003628 894D00              <1> 	MOV	[eBP],eCX		; SAVE POINTER IN STACK FOR RETURN
   912                              <1> ES_DI:
   913                              <1> 	;MOV	[BP+6],BX		; ADDRESS OF MEDIA/DRIVE PARM TABLE 
   914                              <1> 	;mov	[ebp+12], ebx ; 06/02/2015
   915                              <1> 	;MOV	AX,CS			; SEGMENT MEDIA/DRIVE PARAMETER TABLE
   916                              <1> 	;MOV	ES,AX			; ES IS SEGMENT OF TABLE
   917                              <1> 	;
   918                              <1> 	; 28/05/2016
   919                              <1> 	; 27/05/2016
   920                              <1> 	; return floppy disk parameters table to user
   921                              <1> 	; in user's buffer, which is pointed by EBX
   922                              <1> 	;
   923 0000362B 57                  <1> 	push	edi
   924 0000362C 8B7D04              <1> 	mov	edi, [ebp+4]  		; ebx (input), user's buffer address
   925                              <1> 	; 29/08/2020
   926 0000362F 09FF                <1> 	or	edi, edi
   927 00003631 7417                <1> 	jz	short no_copy_fdpt
   928                              <1> 	;
   929 00003633 0FB6C0              <1> 	movzx	eax, al
   930 00003636 894504              <1>         mov	[ebp+4], eax   ; ebx	; drive type (for floppy drives)
   931                              <1> 	; 01/06/2016 (INT 33h, disk type return for floppy disks, in BL)
   932 00003639 A3[4C650100]        <1> 	mov	[user_buffer], eax	; 01/06/2016 (overwrite ebx return value)
   933                              <1> 	;(INT 33h, Function 08h will replace user's buffer addr with disk type!)
   934                              <1> 	;
   935 0000363E 89DE                <1> 	mov	esi, ebx 		; floppy disk parameter table (16 bytes)
   936 00003640 B910000000          <1> 	mov	ecx, 16 ; 16 bytes
   937 00003645 E8B3B10000          <1>         call    transfer_to_user_buffer ; trdosk6.s (16/05/2016)
   938                              <1> no_copy_fdpt:
   939 0000364A 5F                  <1> 	pop	edi	
   940                              <1> DP_OUT:
   941 0000364B E868020000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
   942 00003650 6631C0              <1> 	XOR	AX,AX			; CLEAR
   943 00003653 F8                  <1> 	CLC
   944 00003654 C3                  <1> 	RETn
   945                              <1> 
   946                              <1> ;-----	NO DRIYE PRESENT HANDLER
   947                              <1> 
   948                              <1> NON_DRV:
   949                              <1> 	;MOV	BYTE [BP+4],0		; CLEAR NUMBER OF DRIVES
   950 00003655 895508              <1> 	mov	[ebp+8], edx ; 0 ; 20/02/2015
   951                              <1> NON_DRV1:
   952 00003658 6681FF8000          <1> 	CMP	DI,80H			; CHECK FOR FIXED MEDIA TYPE REQUEST
   953 0000365D 720C                <1> 	JB	short NON_DRV2		; CONTINUE IF NOT REQUEST FALL THROUGH
   954                              <1> 
   955                              <1> ;-----	FIXED DISK REQUEST FALL THROUGH ERROR
   956                              <1> 	
   957 0000365F E854020000          <1> 	CALL	XLAT_OLD		; ELSE TRANSLATE TO COMPATIBLE MODE
   958 00003664 6689F0              <1> 	MOV	AX,SI			; RESTORE AL
   959 00003667 B401                <1> 	MOV	AH,BAD_CMD		; SET BAD COMMAND ERROR
   960 00003669 F9                  <1> 	STC
   961 0000366A C3                  <1> 	RETn
   962                              <1> 
   963                              <1> NON_DRV2:
   964                              <1> 	;XOR	AX,AX			; CLEAR PARMS IF NO DRIVES OR CMOS BAD
   965 0000366B 31C0                <1> 	xor	eax, eax	
   966 0000366D 66894500            <1> 	MOV	[eBP],AX		; TRACKS, SECTORS/TRACK = 0
   967                              <1> 	;MOV	[BP+5],AH		; HEAD = 0
   968 00003671 886509              <1> 	mov	[ebp+9], ah ; 06/02/2015
   969                              <1> 	;MOV	[BP+6],AX		; OFFSET TO DISK_BASE = 0
   970 00003674 89450C              <1> 	mov	[ebp+12], eax
   971                              <1> 	;;MOV	ES,AX			; ES IS SEGMENT OF TABLE
   972                              <1> 	;JMP	SHORT DP_OUT
   973                              <1> 
   974                              <1> 	; 30/08/2020
   975 00003677 E83C020000          <1> 	call	XLAT_OLD
   976                              <1> 	;mov	ah, NOT_RDY ; drive not ready
   977 0000367C B407                <1> 	mov	ah, INIT_FAIL ; DRIVE PARAMETER ACTIVITY FAILED 
   978 0000367E F9                  <1> 	stc	; cf -> 1, ah = 'drive not ready' error code
   979 0000367F C3                  <1> 	retn		
   980                              <1> 
   981                              <1> ;-----	DATA RATE IS EITHER 300 KBS OR 500 KBS, TRY 1.2 MB TABLE FIRST
   982                              <1> 
   983                              <1> USE_EST2:
   984 00003680 B002                <1> 	MOV	AL,02			; DRIVE TYPE 2 (1.2MB)
   985 00003682 E88C010000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
   986 00003687 8A4B04              <1>         MOV     CL, [eBX+MD.SEC_TRK]    ; GET SECTOR/TRACK
   987 0000368A 8A6B0B              <1>         MOV     CH, [eBX+MD.MAX_TRK]    ; GET MAX. TRACK NUMBER
   988 0000368D 80FC40              <1> 	CMP	AH,RATE_300		; RATE 300 ?
   989 00003690 7496                <1> 	JZ	short STO_CX		; MUST BE 1.2MB DRIVE
   990 00003692 EB87                <1> 	JMP	SHORT PARM144		; ELSE, IT IS 1.44MB DRIVE 
   991                              <1> 
   992                              <1> ; 30/08/2020
   993                              <1> 
   994                              <1> ;-------------------------------------------------------------------------------
   995                              <1> ; DISK_TYPE (AH = 15H)	
   996                              <1> ;	THIS ROUTINE RETURNS THE TYPE OF MEDIA INSTALLED.
   997                              <1> ;
   998                              <1> ;  ON ENTRY:	DI = DRIVE #
   999                              <1> ;
  1000                              <1> ;  ON EXIT:	AH = DRIVE TYPE, CY=0
  1001                              <1> ;-------------------------------------------------------------------------------
  1002                              <1> DSK_TYPE:
  1003 00003694 E8EE010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1004 00003699 8A87[55590100]      <1> 	MOV	AL,[DSK_STATE+eDI]	; GET PRESENT STATE INFORMATION
  1005 0000369F 08C0                <1> 	OR	AL,AL			; CHECK FOR NO DRIVE
  1006 000036A1 7418                <1> 	JZ	short NO_DRV
  1007 000036A3 B401                <1> 	MOV	AH,NOCHGLN		; NO CHANGE LINE FOR 40 TRACK DRIVE
  1008 000036A5 A801                <1> 	TEST	AL,TRK_CAPA		; IS THIS DRIVE AN 80 TRACK DRIVE?
  1009 000036A7 7402                <1> 	JZ	short DT_BACK		; IF NO JUMP
  1010 000036A9 B402                <1> 	MOV	AH,CHGLN		; CHANGE LINE FOR 80 TRACK DRIVE
  1011                              <1> DT_BACK:
  1012 000036AB 6650                <1> 	PUSH	AX			; SAVE RETURN VALUE
  1013 000036AD E806020000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1014 000036B2 6658                <1> 	POP	AX			; RESTORE RETURN VALUE
  1015 000036B4 F8                  <1> 	CLC				; NO ERROR
  1016 000036B5 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
  1017 000036B8 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
  1018 000036BA C3                  <1> 	RETn
  1019                              <1> NO_DRV:	
  1020                              <1> 	;XOR	AH,AH			; NO DRIVE PRESENT OR UNKNOWN
  1021                              <1> 	;JMP	SHORT DT_BACK
  1022                              <1> 	
  1023                              <1> 	; 30/08/2020
  1024 000036BB E8F8010000          <1> 	call	XLAT_OLD
  1025 000036C0 29C0                <1> 	sub	eax, eax
  1026 000036C2 F9                  <1> 	stc	; cf = 1 -> drive not ready, ah = 0 (disk type = 0)
  1027 000036C3 C3                  <1> 	retn
  1028                              <1> 
  1029                              <1> ;-------------------------------------------------------------------------------
  1030                              <1> ; DISK_CHANGE	(AH = 16H)
  1031                              <1> ;	THIS ROUTINE RETURNS THE STATE OF THE DISK CHANGE LINE.
  1032                              <1> ;
  1033                              <1> ; ON ENTRY:	DI = DRIVE #
  1034                              <1> ;
  1035                              <1> ; ON EXIT:	AH = @DSKETTE_STATUS
  1036                              <1> ;		     00 - DISK CHANGE LINE INACTIVE, CY = 0
  1037                              <1> ;		     06 - DISK CHANGE LINE ACTIVE, CY = 1
  1038                              <1> ;-------------------------------------------------------------------------------
  1039                              <1> DSK_CHANGE:
  1040 000036C4 E8BE010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1041 000036C9 8A87[55590100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET MEDIA STATE INFORMATION
  1042 000036CF 08C0                <1> 	OR	AL,AL			; DRIVE PRESENT ?
  1043 000036D1 7422                <1> 	JZ	short DC_NON		; JUMP IF NO DRIVE
  1044 000036D3 A801                <1> 	TEST	AL,TRK_CAPA		; 80 TRACK DRIVE ?
  1045 000036D5 7407                <1> 	JZ	short SETIT		; IF SO , CHECK CHANGE LINE
  1046                              <1> DC0:
  1047 000036D7 E88D0A0000          <1>         CALL    READ_DSKCHNG            ; GO CHECK STATE OF DISK CHANGE LINE
  1048 000036DC 7407                <1> 	JZ	short FINIS		; CHANGE LINE NOT ACTIVE
  1049                              <1> 
  1050 000036DE C605[48590100]06    <1> SETIT:	MOV	byte [DSKETTE_STATUS], MEDIA_CHANGE ; INDICATE MEDIA REMOVED
  1051                              <1> 
  1052 000036E5 E8CE010000          <1> FINIS:	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1053 000036EA E808070000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1054 000036EF 6689F3              <1> 	MOV	BX,SI			; GET SAVED AL TO BL
  1055 000036F2 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
  1056 000036F4 C3                  <1> 	RETn
  1057                              <1> DC_NON:
  1058 000036F5 800D[48590100]80    <1> 	OR	byte [DSKETTE_STATUS], TIME_OUT ; SET TIMEOUT, NO DRIVE
  1059 000036FC EBE7                <1> 	JMP	SHORT FINIS
  1060                              <1> 
  1061                              <1> ;-------------------------------------------------------------------------------
  1062                              <1> ; FORMAT_SET	(AH = 17H)
  1063                              <1> ;	THIS ROUTINE IS USED TO ESTABLISH THE TYPE OF MEDIA TO BE USED
  1064                              <1> ;	FOR THE FOLLOWING FORMAT OPERATION.
  1065                              <1> ;
  1066                              <1> ; ON ENTRY:	SI LOW = DASD TYPE FOR FORMAT
  1067                              <1> ;		DI     = DRIVE #
  1068                              <1> ;
  1069                              <1> ; ON EXIT:	@DSKETTE_STATUS REFLECTS STATUS
  1070                              <1> ;		AH = @DSKETTE_STATUS
  1071                              <1> ;		CY = 1 IF ERROR
  1072                              <1> ;-------------------------------------------------------------------------------
  1073                              <1> FORMAT_SET:
  1074 000036FE E884010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1075 00003703 6656                <1> 	PUSH	SI			; SAVE DASD TYPE
  1076 00003705 6689F0              <1> 	MOV	AX,SI			; AH = ? , AL , DASD TYPE
  1077 00003708 30E4                <1> 	XOR	AH,AH			; AH , 0 , AL , DASD TYPE
  1078 0000370A 6689C6              <1> 	MOV	SI,AX			; SI = DASD TYPE
  1079 0000370D 80A7[55590100]0F    <1> 	AND	byte [DSK_STATE+eDI], ~(MED_DET+DBL_STEP+RATE_MSK) ; CLEAR STATE
  1080 00003714 664E                <1> 	DEC	SI			; CHECK FOR 320/360K MEDIA & DRIVE
  1081 00003716 7509                <1> 	JNZ	short NOT_320		; BYPASS IF NOT
  1082 00003718 808F[55590100]90    <1> 	OR	byte [DSK_STATE+eDI], MED_DET+RATE_250 ; SET TO 320/360
  1083 0000371F EB48                <1> 	JMP	SHORT S0
  1084                              <1> 
  1085                              <1> NOT_320:
  1086 00003721 E8B6030000          <1> 	CALL	MED_CHANGE		; CHECK FOR TIME_OUT
  1087 00003726 803D[48590100]80    <1> 	CMP	byte [DSKETTE_STATUS], TIME_OUT
  1088 0000372D 743A                <1> 	JZ	short S0		; IF TIME OUT TELL CALLER
  1089                              <1> S3:
  1090 0000372F 664E                <1> 	DEC	SI			; CHECK FOR 320/360K IN 1.2M DRIVE
  1091 00003731 7509                <1> 	JNZ	short NOT_320_12	; BYPASS IF NOT
  1092 00003733 808F[55590100]70    <1> 	OR	byte [DSK_STATE+eDI], MED_DET+DBL_STEP+RATE_300 ; SET STATE
  1093 0000373A EB2D                <1> 	JMP	SHORT S0
  1094                              <1> 
  1095                              <1> NOT_320_12:
  1096 0000373C 664E                <1> 	DEC	SI			; CHECK FOR 1.2M MEDIA IN 1.2M DRIVE
  1097 0000373E 7509                <1> 	JNZ	short NOT_12		; BYPASS IF NOT
  1098 00003740 808F[55590100]10    <1> 	OR	byte [DSK_STATE+eDI], MED_DET+RATE_500 ; SET STATE VARIABLE
  1099 00003747 EB20                <1> 	JMP	SHORT S0		; RETURN TO CALLER
  1100                              <1> 
  1101                              <1> NOT_12:	
  1102 00003749 664E                <1> 	DEC	SI			; CHECK FOR SET DASD TYPE 04
  1103 0000374B 752B                <1> 	JNZ	short FS_ERR		; BAD COMMAND EXIT IF NOT VALID TYPE
  1104                              <1> 
  1105 0000374D F687[55590100]04    <1> 	TEST	byte [DSK_STATE+eDI], DRV_DET ; DRIVE DETERMINED ?
  1106 00003754 740B                <1> 	JZ	short ASSUME		; IF STILL NOT DETERMINED ASSUME
  1107 00003756 B050                <1> 	MOV	AL,MED_DET+RATE_300
  1108 00003758 F687[55590100]02    <1>         TEST    byte [DSK_STATE+eDI], FMT_CAPA ; MULTIPLE FORMAT CAPABILITY ?
  1109 0000375F 7502                <1> 	JNZ	short OR_IT_IN		; IF 1.2 M THEN DATA RATE 300
  1110                              <1> 
  1111                              <1> ASSUME:
  1112 00003761 B090                <1> 	MOV	AL,MED_DET+RATE_250	; SET UP
  1113                              <1> 
  1114                              <1> OR_IT_IN:
  1115 00003763 0887[55590100]      <1> 	OR	[DSK_STATE+eDI], AL	; OR IN THE CORRECT STATE
  1116                              <1> S0:
  1117 00003769 E84A010000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1118 0000376E E884060000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1119 00003773 665B                <1> 	POP	BX			; GET SAVED AL TO BL
  1120 00003775 88D8                <1> 	MOV	AL,BL			; PUT BACK FOR RETURN
  1121 00003777 C3                  <1> 	RETn
  1122                              <1> 
  1123                              <1> FS_ERR:
  1124 00003778 C605[48590100]01    <1> 	MOV	byte [DSKETTE_STATUS], BAD_CMD ; UNKNOWN STATE,BAD COMMAND
  1125 0000377F EBE8                <1> 	JMP	SHORT S0
  1126                              <1> 
  1127                              <1> ;-------------------------------------------------------------------------------
  1128                              <1> ; SET_MEDIA	(AH = 18H)
  1129                              <1> ;	THIS ROUTINE SETS THE TYPE OF MEDIA AND DATA RATE 
  1130                              <1> ;	TO BE USED FOR THE FOLLOWING FORMAT OPERATION.
  1131                              <1> ;
  1132                              <1> ; ON ENTRY:
  1133                              <1> ;	[BP]	= SECTOR PER TRACK
  1134                              <1> ;	[BP+1]	= TRACK #
  1135                              <1> ;	DI	= DRIVE #
  1136                              <1> ;
  1137                              <1> ; ON EXIT:
  1138                              <1> ;	@DSKETTE_STATUS REFLECTS STATUS
  1139                              <1> ;	IF NO ERROR:
  1140                              <1> ;		AH = 0
  1141                              <1> ;		CY = 0
  1142                              <1> ;		ES = SEGMENT OF MEDIA/DRIVE PARAMETER TABLE
  1143                              <1> ;		DI/[BP+6] = OFFSET OF MEDIA/DRIVE PARAMETER TABLE
  1144                              <1> ;	IF ERROR:	
  1145                              <1> ;		AH = @DSKETTE_STATUS
  1146                              <1> ;		CY = 1
  1147                              <1> ;-------------------------------------------------------------------------------
  1148                              <1> SET_MEDIA:
  1149 00003781 E801010000          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1150 00003786 F687[55590100]01    <1>         TEST    byte [DSK_STATE+eDI], TRK_CAPA ; CHECK FOR CHANGE LINE AVAILABLE
  1151 0000378D 7415                <1> 	JZ	short SM_CMOS		; JUMP IF 40 TRACK DRIVE
  1152 0000378F E848030000          <1> 	CALL	MED_CHANGE		; RESET CHANGE LINE
  1153 00003794 803D[48590100]80    <1> 	CMP	byte [DSKETTE_STATUS], TIME_OUT ; IF TIME OUT TELL CALLER
  1154 0000379B 746B                <1> 	JE	short SM_RTN
  1155 0000379D C605[48590100]00    <1> 	MOV	byte [DSKETTE_STATUS], 0 ; CLEAR STATUS
  1156                              <1> SM_CMOS:
  1157 000037A4 E819070000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN (AL)
  1158                              <1> 	;;20/02/2015
  1159                              <1> 	;;JC	short MD_NOT_FND	; ERROR IN CMOS
  1160                              <1> 	;;OR	AL,AL			; TEST FOR NO DRIVE
  1161 000037A9 745D                <1> 	JZ	short SM_RTN		; RETURN IF SO
  1162 000037AB E863000000          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL
  1163 000037B0 7231                <1> 	JC	short MD_NOT_FND	; TYPE NOT IN TABLE (BAD CMOS)
  1164 000037B2 57                  <1> 	PUSH	eDI			; SAVE REG.
  1165 000037B3 31DB                <1> 	XOR	eBX,eBX			; BX = INDEX TO DR. TYPE TABLE
  1166 000037B5 B906000000          <1> 	MOV	eCX,DR_CNT		; CX = LOOP COUNT
  1167                              <1> DR_SEARCH:
  1168 000037BA 8AA3[D05C0000]      <1> 	MOV	AH, [DR_TYPE+eBX]	; GET DRIVE TYPE
  1169 000037C0 80E47F              <1> 	AND	AH,BIT7OFF		; MASK OUT MSB
  1170 000037C3 38E0                <1> 	CMP	AL,AH			; DRIVE TYPE MATCH ?
  1171 000037C5 7516                <1> 	JNE	short NXT_MD		; NO, CHECK NEXT DRIVE TYPE
  1172                              <1> DR_FND:
  1173 000037C7 8BBB[D15C0000]      <1> 	MOV	eDI, [DR_TYPE+eBX+1] 	; DI = MEDIA/DRIVE PARAM TABLE
  1174                              <1> MD_SEARCH:
  1175 000037CD 8A6704              <1>         MOV     AH, [eDI+MD.SEC_TRK]    ; GET SECTOR/TRACK
  1176 000037D0 386500              <1> 	CMP	[eBP],AH		; MATCH?
  1177 000037D3 7508                <1> 	JNE	short NXT_MD		; NO, CHECK NEXT MEDIA
  1178 000037D5 8A670B              <1>         MOV     AH, [eDI+MD.MAX_TRK]    ; GET MAX. TRACK #
  1179 000037D8 386501              <1> 	CMP 	[eBP+1],AH		; MATCH?
  1180 000037DB 740F                <1> 	JE	short MD_FND		; YES, GO GET RATE
  1181                              <1> NXT_MD:
  1182                              <1> 	;ADD	BX,3			; CHECK NEXT DRIVE TYPE
  1183 000037DD 83C305              <1>         add	ebx, 5 ; 18/02/2015
  1184 000037E0 E2D8                <1> 	LOOP    DR_SEARCH
  1185 000037E2 5F                  <1> 	POP	eDI			; RESTORE REG.
  1186                              <1> MD_NOT_FND:
  1187 000037E3 C605[48590100]0C    <1> 	MOV	byte [DSKETTE_STATUS], MED_NOT_FND ; ERROR, MEDIA TYPE NOT FOUND
  1188 000037EA EB1C                <1> 	JMP	SHORT SM_RTN		; RETURN
  1189                              <1> MD_FND:
  1190 000037EC 8A470C              <1>         MOV     AL, [eDI+MD.RATE]       ; GET RATE
  1191 000037EF 3C40                <1> 	CMP	AL,RATE_300		; DOUBLE STEP REQUIRED FOR RATE 300
  1192 000037F1 7502                <1> 	JNE	short MD_SET
  1193 000037F3 0C20                <1> 	OR	AL,DBL_STEP
  1194                              <1> MD_SET:
  1195                              <1> 	;MOV	[BP+6],DI		; SAVE TABLE POINTER IN STACK
  1196 000037F5 897D0C              <1> 	mov	[ebp+12], edi ; 18/02/2015
  1197 000037F8 0C10                <1> 	OR	AL,MED_DET		; SET MEDIA ESTABLISHED
  1198 000037FA 5F                  <1> 	POP	eDI
  1199 000037FB 80A7[55590100]0F    <1> 	AND	byte [DSK_STATE+eDI], ~(MED_DET+DBL_STEP+RATE_MSK) ; CLEAR STATE
  1200 00003802 0887[55590100]      <1> 	OR	[DSK_STATE+eDI], AL
  1201                              <1> 	;MOV	AX, CS			; SEGMENT OF MEDIA/DRIVE PARAMETER TABLE
  1202                              <1> 	;MOV	ES, AX			; ES IS SEGMENT OF TABLE
  1203                              <1> SM_RTN:
  1204 00003808 E8AB000000          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1205 0000380D E8E5050000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1206 00003812 C3                  <1> 	RETn
  1207                              <1> 
  1208                              <1> ;----------------------------------------------------------------
  1209                              <1> ; DR_TYPE_CHECK							:
  1210                              <1> ;	CHECK IF THE GIVEN DRIVE TYPE IN REGISTER (AL)		:
  1211                              <1> ;	IS SUPPORTED IN BIOS DRIVE TYPE TABLE			:
  1212                              <1> ; ON ENTRY:							:
  1213                              <1> ;	AL = DRIVE TYPE						:
  1214                              <1> ; ON EXIT:							:
  1215                              <1> ;	CS = SEGMENT MEDIA/DRIVE PARAMETER TABLE (CODE)		:
  1216                              <1> ;	CY = 0 	DRIVE TYPE SUPPORTED				:
  1217                              <1> ;	     BX = OFFSET TO MEDIA/DRIVE PARAMETER TABLE		:
  1218                              <1> ;	CY = 1	DRIVE TYPE NOT SUPPORTED 			:
  1219                              <1> ; REGISTERS ALTERED: eBX						:
  1220                              <1> ;----------------------------------------------------------------		
  1221                              <1> DR_TYPE_CHECK:
  1222 00003813 6650                <1> 	PUSH	AX			
  1223 00003815 51                  <1> 	PUSH	eCX
  1224 00003816 31DB                <1> 	XOR	eBX,eBX			; BX = INDEX TO DR_TYPE TABLE
  1225 00003818 B906000000          <1> 	MOV	eCX,DR_CNT		; CX = LOOP COUNT
  1226                              <1> TYPE_CHK:	
  1227 0000381D 8AA3[D05C0000]      <1> 	MOV	AH,[DR_TYPE+eBX]	; GET DRIVE TYPE
  1228 00003823 38E0                <1> 	CMP	AL,AH			; DRIVE TYPE MATCH?
  1229 00003825 740D                <1> 	JE	short DR_TYPE_VALID	; YES, RETURN WITH CARRY RESET
  1230                              <1> 	;ADD	BX,3			; CHECK NEXT DRIVE TYPE
  1231 00003827 83C305              <1>         add	ebx, 5	; 16/02/2015 (32 bit address modification)
  1232 0000382A E2F1                <1> 	LOOP    TYPE_CHK
  1233                              <1> 	;
  1234 0000382C BB[2F5D0000]        <1> 	mov	ebx, MD_TBL6		; 1.44MB fd parameter table
  1235                              <1> 					; Default for GET_PARM (11/12/2014)
  1236                              <1> 	;
  1237 00003831 F9                  <1> 	STC				; DRIVE TYPE NOT FOUND IN TABLE
  1238 00003832 EB06                <1> 	JMP	SHORT TYPE_RTN
  1239                              <1> DR_TYPE_VALID:
  1240 00003834 8B9B[D15C0000]      <1> 	MOV	eBX,[DR_TYPE+eBX+1] 	; BX = MEDIA TABLE
  1241                              <1> TYPE_RTN:
  1242 0000383A 59                  <1> 	POP	eCX
  1243 0000383B 6658                <1> 	POP	AX
  1244 0000383D C3                  <1> 	RETn	
  1245                              <1> 		
  1246                              <1> ;----------------------------------------------------------------
  1247                              <1> ; SEND_SPEC							:
  1248                              <1> ;	SEND THE SPECIFY COMMAND TO CONTROLLER USING DATA FROM	:
  1249                              <1> ;	THE DRIVE PARAMETER TABLE POINTED BY @DISK_POINTER	:
  1250                              <1> ; ON ENTRY:	@DISK_POINTER = DRIVE PARAMETER TABLE		:
  1251                              <1> ; ON EXIT:	NONE						:	
  1252                              <1> ; REGISTERS ALTERED: CX, DX					:
  1253                              <1> ;----------------------------------------------------------------		
  1254                              <1> SEND_SPEC:
  1255 0000383E 50                  <1> 	PUSH	eAX			; SAVE AX
  1256 0000383F B8[65380000]        <1> 	MOV	eAX, SPECBAC		; LOAD ERROR ADDRESS
  1257 00003844 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
  1258 00003845 B403                <1> 	MOV	AH,03H			; SPECIFY COMMAND
  1259 00003847 E885070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1260 0000384C 28D2                <1> 	SUB	DL,DL			; FIRST SPECIFY BYTE
  1261 0000384E E878060000          <1> 	CALL	GET_PARM		; GET PARAMETER TO AH
  1262 00003853 E879070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1263 00003858 B201                <1> 	MOV	DL,1			; SECOND SPECIFY BYTE
  1264 0000385A E86C060000          <1> 	CALL	GET_PARM		; GET PARAMETER TO AH
  1265 0000385F E86D070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1266 00003864 58                  <1> 	POP	eAX			; POP ERROR RETURN
  1267                              <1> SPECBAC:
  1268 00003865 58                  <1> 	POP	eAX			; RESTORE ORIGINAL AX VALUE
  1269 00003866 C3                  <1> 	RETn
  1270                              <1> 
  1271                              <1> ;----------------------------------------------------------------
  1272                              <1> ; SEND_SPEC_MD							:
  1273                              <1> ;	SEND THE SPECIFY COMMAND TO CONTROLLER USING DATA FROM	:
  1274                              <1> ;	THE MEDIA/DRIVE PARAMETER TABLE POINTED BY (CS:BX)	:
  1275                              <1> ; ON ENTRY:	CS:BX = MEDIA/DRIVE PARAMETER TABLE		:
  1276                              <1> ; ON EXIT:	NONE						:	
  1277                              <1> ; REGISTERS ALTERED: AX						:
  1278                              <1> ;----------------------------------------------------------------		
  1279                              <1> SEND_SPEC_MD:
  1280 00003867 50                  <1> 	PUSH	eAX			; SAVE RATE DATA
  1281 00003868 B8[85380000]        <1> 	MOV	eAX, SPEC_ESBAC		; LOAD ERROR ADDRESS
  1282 0000386D 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
  1283 0000386E B403                <1> 	MOV	AH,03H			; SPECIFY COMMAND
  1284 00003870 E85C070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1285 00003875 8A23                <1>         MOV     AH, [eBX+MD.SPEC1]      ; GET 1ST SPECIFY BYTE
  1286 00003877 E855070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1287 0000387C 8A6301              <1>         MOV     AH, [eBX+MD.SPEC2]      ; GET SECOND SPECIFY BYTE
  1288 0000387F E84D070000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE COMMAND
  1289 00003884 58                  <1> 	POP	eAX			; POP ERROR RETURN
  1290                              <1> SPEC_ESBAC:
  1291 00003885 58                  <1> 	POP	eAX			; RESTORE ORIGINAL AX VALUE
  1292 00003886 C3                  <1> 	RETn
  1293                              <1> 
  1294                              <1> ;-------------------------------------------------------------------------------
  1295                              <1> ; XLAT_NEW  
  1296                              <1> ;	TRANSLATES DISKETTE STATE LOCATIONS FROM COMPATIBLE
  1297                              <1> ;	MODE TO NEW ARCHITECTURE.
  1298                              <1> ;
  1299                              <1> ; ON ENTRY:	DI = DRIVE #
  1300                              <1> ;-------------------------------------------------------------------------------
  1301                              <1> XLAT_NEW:
  1302 00003887 83FF01              <1> 	CMP	eDI,1				; VALID DRIVE
  1303 0000388A 7725                <1> 	JA	short XN_OUT			; IF INVALID BACK
  1304 0000388C 80BF[55590100]00    <1> 	CMP	byte [DSK_STATE+eDI], 0		; NO DRIVE ?
  1305 00003893 741D                <1> 	JZ	short DO_DET			; IF NO DRIVE ATTEMPT DETERMINE
  1306 00003895 6689F9              <1> 	MOV	CX,DI				; CX = DRIVE NUMBER
  1307 00003898 C0E102              <1> 	SHL	CL,2				; CL = SHIFT COUNT, A=0, B=4
  1308 0000389B A0[54590100]        <1> 	MOV	AL, [HF_CNTRL]			; DRIVE INFORMATION
  1309 000038A0 D2C8                <1> 	ROR	AL,CL				; TO LOW NIBBLE
  1310 000038A2 2407                <1> 	AND	AL,DRV_DET+FMT_CAPA+TRK_CAPA	; KEEP DRIVE BITS
  1311 000038A4 80A7[55590100]F8    <1>         AND     byte [DSK_STATE+eDI], ~(DRV_DET+FMT_CAPA+TRK_CAPA)
  1312 000038AB 0887[55590100]      <1> 	OR	[DSK_STATE+eDI], AL		; UPDATE DRIVE STATE
  1313                              <1> XN_OUT:
  1314 000038B1 C3                  <1> 	RETn
  1315                              <1> DO_DET:
  1316 000038B2 E8BF080000          <1> 	CALL	DRIVE_DET			; TRY TO DETERMINE
  1317 000038B7 C3                  <1> 	RETn
  1318                              <1> 
  1319                              <1> ;-------------------------------------------------------------------------------
  1320                              <1> ; XLAT_OLD 
  1321                              <1> ;	TRANSLATES DISKETTE STATE LOCATIONS FROM NEW
  1322                              <1> ;	ARCHITECTURE TO COMPATIBLE MODE.
  1323                              <1> ;
  1324                              <1> ; ON ENTRY:	DI = DRIVE
  1325                              <1> ;-------------------------------------------------------------------------------
  1326                              <1> XLAT_OLD:
  1327 000038B8 83FF01              <1> 	CMP	eDI,1			; VALID DRIVE ?
  1328                              <1>         ;JA     short XO_OUT            ; IF INVALID BACK
  1329 000038BB 0F8786000000        <1>         ja      XO_OUT
  1330 000038C1 80BF[55590100]00    <1>         CMP	byte [DSK_STATE+eDI],0	; NO DRIVE ?
  1331 000038C8 747D                <1> 	JZ	short XO_OUT		; IF NO DRIVE TRANSLATE DONE
  1332                              <1> 
  1333                              <1> ;-----	TEST FOR SAVED DRIVE INFORMATION ALREADY SET
  1334                              <1> 
  1335 000038CA 6689F9              <1> 	MOV	CX,DI			; CX = DRIVE NUMBER
  1336 000038CD C0E102              <1> 	SHL	CL,2			; CL = SHIFT COUNT, A=0, B=4
  1337 000038D0 B402                <1> 	MOV	AH,FMT_CAPA		; LOAD MULTIPLE DATA RATE BIT MASK
  1338 000038D2 D2CC                <1> 	ROR	AH,CL			; ROTATE BY MASK
  1339 000038D4 8425[54590100]      <1> 	TEST	[HF_CNTRL], AH		; MULTIPLE-DATA RATE DETERMINED ?
  1340 000038DA 751C                <1> 	JNZ	short SAVE_SET		; IF SO, NO NEED TO RE-SAVE
  1341                              <1> 
  1342                              <1> ;-----	ERASE DRIVE BITS IN @HF_CNTRL FOR THIS DRIVE
  1343                              <1> 
  1344 000038DC B407                <1> 	MOV	AH,DRV_DET+FMT_CAPA+TRK_CAPA ; MASK TO KEEP
  1345 000038DE D2CC                <1> 	ROR	AH,CL			; FIX MASK TO KEEP
  1346 000038E0 F6D4                <1> 	NOT	AH			; TRANSLATE MASK
  1347 000038E2 2025[54590100]      <1> 	AND	[HF_CNTRL], AH		; KEEP BITS FROM OTHER DRIVE INTACT
  1348                              <1> 
  1349                              <1> ;-----	ACCESS CURRENT DRIVE BITS AND STORE IN @HF_CNTRL
  1350                              <1> 
  1351 000038E8 8A87[55590100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; ACCESS STATE
  1352 000038EE 2407                <1> 	AND	AL,DRV_DET+FMT_CAPA+TRK_CAPA ; KEEP DRIVE BITS
  1353 000038F0 D2C8                <1> 	ROR	AL,CL			; FIX FOR THIS DRIVE
  1354 000038F2 0805[54590100]      <1> 	OR	[HF_CNTRL], AL		; UPDATE SAVED DRIVE STATE
  1355                              <1> 
  1356                              <1> ;-----	TRANSLATE TO COMPATIBILITY MODE
  1357                              <1> 
  1358                              <1> SAVE_SET:
  1359 000038F8 8AA7[55590100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; ACCESS STATE
  1360 000038FE 88E7                <1> 	MOV	BH,AH			; TO BH FOR LATER
  1361 00003900 80E4C0              <1> 	AND	AH,RATE_MSK		; KEEP ONLY RATE
  1362 00003903 80FC00              <1> 	CMP	AH,RATE_500		; RATE 500 ?
  1363 00003906 7410                <1> 	JZ	short CHK_144		; YES 1.2/1.2 OR 1.44/1.44
  1364 00003908 B001                <1> 	MOV	AL,M3D1U		; AL = 360 IN 1.2 UNESTABLISHED
  1365 0000390A 80FC40              <1> 	CMP	AH,RATE_300		; RATE 300 ?
  1366 0000390D 7518                <1> 	JNZ	short CHK_250		; NO, 360/360, 720/720 OR 720/1.44
  1367 0000390F F6C720              <1> 	TEST	BH,DBL_STEP		; CHECK FOR DOUBLE STEP
  1368 00003912 751F                <1> 	JNZ	short TST_DET		; MUST BE 360 IN 1.2
  1369                              <1> UNKNO:
  1370 00003914 B007                <1> 	MOV	AL,MED_UNK		; NONE OF THE ABOVE
  1371 00003916 EB22                <1> 	JMP	SHORT AL_SET		; PROCESS COMPLETE
  1372                              <1> CHK_144:
  1373 00003918 E8A5050000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN (AL)
  1374                              <1> 	;;20/02/2015
  1375                              <1> 	;;JC	short UNKNO		; ERROR, SET 'NONE OF ABOVE'
  1376 0000391D 74F5                <1> 	jz	short UNKNO ;; 20/02/2015
  1377 0000391F 3C02                <1> 	CMP	AL,2			; 1.2MB DRIVE ?
  1378 00003921 75F1                <1> 	JNE	short UNKNO		; NO, GO SET 'NONE OF ABOVE'
  1379 00003923 B002                <1> 	MOV	AL,M1D1U		; AL = 1.2 IN 1.2 UNESTABLISHED
  1380 00003925 EB0C                <1> 	JMP	SHORT TST_DET
  1381                              <1> CHK_250:
  1382 00003927 B000                <1> 	MOV	AL,M3D3U		; AL = 360 IN 360 UNESTABLISHED
  1383 00003929 80FC80              <1> 	CMP	AH,RATE_250		; RATE 250 ?
  1384 0000392C 75E6                <1> 	JNZ	short UNKNO		; IF SO FALL IHRU
  1385 0000392E F6C701              <1> 	TEST	BH,TRK_CAPA		; 80 TRACK CAPABILITY ?
  1386 00003931 75E1                <1> 	JNZ	short UNKNO		; IF SO JUMP, FALL THRU TEST DET
  1387                              <1> TST_DET:
  1388 00003933 F6C710              <1> 	TEST	BH,MED_DET		; DETERMINED ?
  1389 00003936 7402                <1> 	JZ	short AL_SET		; IF NOT THEN SET
  1390 00003938 0403                <1> 	ADD	AL,3			; MAKE DETERMINED/ESTABLISHED
  1391                              <1> AL_SET:
  1392 0000393A 80A7[55590100]F8    <1> 	AND	byte [DSK_STATE+eDI], ~(DRV_DET+FMT_CAPA+TRK_CAPA) ; CLEAR DRIVE
  1393 00003941 0887[55590100]      <1> 	OR	[DSK_STATE+eDI], AL	; REPLACE WITH COMPATIBLE MODE
  1394                              <1> XO_OUT:
  1395 00003947 C3                  <1> 	RETn
  1396                              <1> 
  1397                              <1> ;-------------------------------------------------------------------------------
  1398                              <1> ; RD_WR_VF
  1399                              <1> ;	COMMON READ, WRITE AND VERIFY: 
  1400                              <1> ;	MAIN LOOP FOR STATE RETRIES.
  1401                              <1> ;
  1402                              <1> ; ON ENTRY:	AH = READ/WRITE/VERIFY NEC PARAMETER
  1403                              <1> ;		AL = READ/WRITE/VERIFY DMA PARAMETER
  1404                              <1> ;
  1405                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1406                              <1> ;-------------------------------------------------------------------------------
  1407                              <1> RD_WR_VF:
  1408 00003948 6650                <1> 	PUSH	AX			; SAVE DMA, NEC PARAMETERS
  1409 0000394A E838FFFFFF          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH.
  1410 0000394F E8F3000000          <1> 	CALL	SETUP_STATE		; INITIALIZE START AND END RATE
  1411 00003954 6658                <1> 	POP	AX			; RESTORE READ/WRITE/VERIFY
  1412                              <1> DO_AGAIN:
  1413 00003956 6650                <1> 	PUSH	AX			; SAVE READ/WRITE/VERIFY PARAMETER
  1414 00003958 E87F010000          <1> 	CALL	MED_CHANGE		; MEDIA CHANGE AND RESET IF CHANGED
  1415 0000395D 6658                <1> 	POP	AX			; RESTORE READ/WRITE/VERIFY
  1416 0000395F 0F82C9000000        <1>         JC      RWV_END                 ; MEDIA CHANGE ERROR OR TIME-OUT
  1417                              <1> RWV:
  1418 00003965 6650                <1> 	PUSH	AX			; SAVE READ/WRITE/VERIFY PARAMETER
  1419 00003967 8AB7[55590100]      <1> 	MOV	DH, [DSK_STATE+eDI]	; GET RATE STATE OF THIS DRIVE
  1420 0000396D 80E6C0              <1> 	AND	DH,RATE_MSK		; KEEP ONLY RATE
  1421 00003970 E84D050000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN AL (AL)
  1422                              <1> 	;;20/02/2015
  1423                              <1> 	;;JC	short RWV_ASSUME	; ERROR IN CMOS
  1424 00003975 7451                <1> 	jz	short RWV_ASSUME ; 20/02/2015
  1425 00003977 3C01                <1> 	CMP	AL,1			; 40 TRACK DRIVE?
  1426 00003979 750D                <1> 	JNE	short RWV_1		; NO, BYPASS CMOS VALIDITY CHECK
  1427 0000397B F687[55590100]01    <1> 	TEST	byte [DSK_STATE+eDI], TRK_CAPA ; CHECK FOR 40 TRACK DRIVE
  1428 00003982 7413                <1> 	JZ	short RWV_2		; YES, CMOS IS CORRECT
  1429 00003984 B002                <1> 	MOV	AL,2			; CHANGE TO 1.2M
  1430 00003986 EB0F                <1> 	JMP	SHORT RWV_2
  1431                              <1> RWV_1:
  1432 00003988 720D                <1> 	JB	short RWV_2		; NO DRIVE SPECIFIED, CONTINUE
  1433 0000398A F687[55590100]01    <1> 	TEST    byte [DSK_STATE+eDI], TRK_CAPA ; IS IT REALLY 40 TRACK?
  1434 00003991 7504                <1> 	JNZ	short RWV_2		; NO, 80 TRACK
  1435 00003993 B001                <1> 	MOV	AL,1			; IT IS 40 TRACK, FIX CMOS VALUE
  1436 00003995 EB04                <1> 	jmp	short rwv_3
  1437                              <1> RWV_2:
  1438 00003997 08C0                <1> 	OR	AL,AL			; TEST FOR NO DRIVE
  1439 00003999 742D                <1> 	JZ	short RWV_ASSUME	; ASSUME TYPE, USE MAX TRACK
  1440                              <1> rwv_3:
  1441 0000399B E873FEFFFF          <1> 	CALL	DR_TYPE_CHECK		; RTN CS:BX = MEDIA/DRIVE PARAM TBL.
  1442 000039A0 7226                <1> 	JC	short RWV_ASSUME	; TYPE NOT IN TABLE (BAD CMOS)
  1443                              <1> 
  1444                              <1> ;-----	SEARCH FOR MEDIA/DRIVE PARAMETER TABLE
  1445                              <1> 
  1446 000039A2 57                  <1> 	PUSH	eDI			; SAVE DRIVE #
  1447 000039A3 31DB                <1> 	XOR	eBX,eBX			; BX = INDEX TO DR_TYPE TABLE
  1448 000039A5 B906000000          <1> 	MOV	eCX,DR_CNT		; CX = LOOP COUNT
  1449                              <1> RWV_DR_SEARCH:
  1450 000039AA 8AA3[D05C0000]      <1> 	MOV	AH, [DR_TYPE+eBX]	; GET DRIVE TYPE
  1451 000039B0 80E47F              <1> 	AND	AH,BIT7OFF		; MASK OUT MSB
  1452 000039B3 38E0                <1> 	CMP	AL,AH			; DRIVE TYPE MATCH?
  1453 000039B5 750B                <1> 	JNE	short RWV_NXT_MD	; NO, CHECK NEXT DRIVE TYPE
  1454                              <1> RWV_DR_FND:
  1455 000039B7 8BBB[D15C0000]      <1> 	MOV	eDI, [DR_TYPE+eBX+1] 	; DI = MEDIA/DRIVE PARAMETER TABLE
  1456                              <1> RWV_MD_SEARH:
  1457 000039BD 3A770C              <1>         CMP     DH, [eDI+MD.RATE]       ; MATCH?
  1458 000039C0 741B                <1> 	JE	short RWV_MD_FND	; YES, GO GET 1ST SPECIFY BYTE
  1459                              <1> RWV_NXT_MD:
  1460                              <1> 	;ADD	BX,3			; CHECK NEXT DRIVE TYPE
  1461 000039C2 83C305              <1> 	add	eBX, 5
  1462 000039C5 E2E3                <1> 	LOOP	RWV_DR_SEARCH
  1463 000039C7 5F                  <1> 	POP	eDI			; RESTORE DRIVE #
  1464                              <1> 
  1465                              <1> ;-----	ASSUME PRIMARY DRIVE IS INSTALLED AS SHIPPED
  1466                              <1> 
  1467                              <1> RWV_ASSUME:
  1468 000039C8 BB[EE5C0000]        <1> 	MOV	eBX, MD_TBL1		; POINT TO 40 TRACK 250 KBS
  1469 000039CD F687[55590100]01    <1> 	TEST 	byte [DSK_STATE+eDI], TRK_CAPA ; TEST FOR 80 TRACK
  1470 000039D4 740A                <1> 	JZ	short RWV_MD_FND1	; MUST BE 40 TRACK
  1471 000039D6 BB[085D0000]        <1> 	MOV	eBX, MD_TBL3		; POINT TO 80 TRACK 500 KBS
  1472 000039DB EB03                <1> 	JMP	short RWV_MD_FND1	; GO SPECIFY PARAMTERS
  1473                              <1> 
  1474                              <1> ;-----	CS:BX POINTS TO MEDIA/DRIVE PARAMETER TABLE
  1475                              <1> 	 			
  1476                              <1> RWV_MD_FND:
  1477 000039DD 89FB                <1> 	MOV	eBX,eDI			; BX = MEDIA/DRIVE PARAMETER TABLE
  1478 000039DF 5F                  <1> 	POP	eDI			; RESTORE DRIVE #
  1479                              <1> 	
  1480                              <1> ;-----	SEND THE SPECIFY COMMAND TO THE CONTROLLER
  1481                              <1> 
  1482                              <1> RWV_MD_FND1:
  1483 000039E0 E882FEFFFF          <1> 	CALL	SEND_SPEC_MD
  1484 000039E5 E864010000          <1> 	CALL	CHK_LASTRATE		; ZF=1 ATTEMP RATE IS SAME AS LAST RATE
  1485 000039EA 7405                <1> 	JZ	short RWV_DBL		; YES,SKIP SEND RATE COMMAND
  1486 000039EC E83B010000          <1> 	CALL	SEND_RATE		; SEND DATA RATE TO NEC
  1487                              <1> RWV_DBL:
  1488 000039F1 53                  <1> 	PUSH	eBX			; SAVE MEDIA/DRIVE PARAM TBL ADDRESS
  1489 000039F2 E822040000          <1> 	CALL	SETUP_DBL		; CHECK FOR DOUBLE STEP
  1490 000039F7 5B                  <1> 	POP	eBX			; RESTORE ADDRESS
  1491 000039F8 7226                <1> 	JC	short CHK_RET		; ERROR FROM READ ID, POSSIBLE RETRY
  1492 000039FA 6658                <1> 	POP	AX			; RESTORE NEC, DMA COMMAND
  1493 000039FC 6650                <1> 	PUSH	AX			; SAVE NEC COMMAND
  1494 000039FE 53                  <1> 	PUSH	eBX			; SAVE MEDIA/DRIVE PARAM TBL ADDRESS
  1495 000039FF E861010000          <1> 	CALL	DMA_SETUP		; SET UP THE DMA
  1496 00003A04 5B                  <1> 	POP	eBX 
  1497 00003A05 6658                <1> 	POP	AX			; RESTORE NEC COMMAND
  1498 00003A07 722F                <1> 	JC	short RWV_BAC		; CHECK FOR DMA BOUNDARY ERROR
  1499 00003A09 6650                <1> 	PUSH	AX			; SAVE NEC COMMAND
  1500 00003A0B 53                  <1> 	PUSH	eBX			; SAVE MEDIA/DRIVE PARAM TBL ADDRESS
  1501 00003A0C E83C020000          <1> 	CALL	NEC_INIT		; INITIALIZE NEC
  1502 00003A11 5B                  <1> 	POP	eBX			; RESTORE ADDRESS
  1503 00003A12 720C                <1> 	JC	short CHK_RET		; ERROR - EXIT
  1504 00003A14 E866020000          <1> 	CALL	RWV_COM			; OP CODE COMMON TO READ/WRITE/VERIFY
  1505 00003A19 7205                <1> 	JC	short CHK_RET		; ERROR - EXIT
  1506 00003A1B E8AB020000          <1> 	CALL	NEC_TERM		; TERMINATE, GET STATUS, ETC.
  1507                              <1> CHK_RET:
  1508 00003A20 E84A030000          <1> 	CALL	RETRY			; CHECK FOR, SETUP RETRY
  1509 00003A25 6658                <1> 	POP	AX			; RESTORE READ/WRITE/VERIFY PARAMETER
  1510 00003A27 7305                <1> 	JNC	short RWV_END		; CY = 0 NO RETRY
  1511 00003A29 E928FFFFFF          <1>         JMP     DO_AGAIN                ; CY = 1 MEANS RETRY
  1512                              <1> RWV_END:
  1513 00003A2E E8F4020000          <1> 	CALL	DSTATE			; ESTABLISH STATE IF SUCCESSFUL
  1514 00003A33 E887030000          <1> 	CALL	NUM_TRANS		; AL = NUMBER TRANSFERRED
  1515                              <1> RWV_BAC:				; BAD DMA ERROR ENTRY
  1516 00003A38 6650                <1> 	PUSH	AX			; SAVE NUMBER TRANSFERRED
  1517 00003A3A E879FEFFFF          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  1518 00003A3F 6658                <1> 	POP	AX			; RESTORE NUMBER TRANSFERRED
  1519 00003A41 E8B1030000          <1> 	CALL	SETUP_END		; VARIOUS CLEANUPS
  1520 00003A46 C3                  <1> 	RETn
  1521                              <1> 
  1522                              <1> ;-------------------------------------------------------------------------------
  1523                              <1> ; SETUP_STATE:	INITIALIZES START AND END RATES.
  1524                              <1> ;-------------------------------------------------------------------------------
  1525                              <1> SETUP_STATE:
  1526 00003A47 F687[55590100]10    <1> 	TEST	byte [DSK_STATE+eDI], MED_DET ; MEDIA DETERMINED ?
  1527 00003A4E 7537                <1> 	JNZ	short J1C		; NO STATES IF DETERMINED
  1528 00003A50 66B84000            <1>         MOV     AX,(RATE_500*256)+RATE_300  ; AH = START RATE, AL = END RATE
  1529 00003A54 F687[55590100]04    <1> 	TEST	byte [DSK_STATE+eDI],DRV_DET ; DRIVE ?
  1530 00003A5B 740D                <1> 	JZ	short AX_SET		; DO NOT KNOW DRIVE
  1531 00003A5D F687[55590100]02    <1> 	TEST	byte [DSK_STATE+eDI], FMT_CAPA ; MULTI-RATE?
  1532 00003A64 7504                <1> 	JNZ	short AX_SET		; JUMP IF YES
  1533 00003A66 66B88080            <1>         MOV     AX,RATE_250*257         ; START A END RATE 250 FOR 360 DRIVE
  1534                              <1> AX_SET:	
  1535 00003A6A 80A7[55590100]1F    <1> 	AND	byte [DSK_STATE+eDI], ~(RATE_MSK+DBL_STEP) ; TURN OFF THE RATE
  1536 00003A71 08A7[55590100]      <1> 	OR	[DSK_STATE+eDI], AH	; RATE FIRST TO TRY
  1537 00003A77 8025[50590100]F3    <1> 	AND	byte [LASTRATE], ~STRT_MSK ; ERASE LAST TO TRY RATE BITS
  1538 00003A7E C0C804              <1> 	ROR	AL,4			; TO OPERATION LAST RATE LOCATION
  1539 00003A81 0805[50590100]      <1> 	OR	[LASTRATE], AL		; LAST RATE
  1540                              <1> J1C:	
  1541 00003A87 C3                  <1> 	RETn
  1542                              <1> 
  1543                              <1> ;-------------------------------------------------------------------------------
  1544                              <1> ;  FMT_INIT: ESTABLISH STATE IF UNESTABLISHED AT FORMAT TIME.
  1545                              <1> ;-------------------------------------------------------------------------------
  1546                              <1> FMT_INIT:
  1547 00003A88 F687[55590100]10    <1> 	TEST	byte [DSK_STATE+eDI], MED_DET ; IS MEDIA ESTABLISHED
  1548 00003A8F 7546                <1> 	JNZ	short F1_OUT		; IF SO RETURN
  1549 00003A91 E82C040000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN AL
  1550                              <1> 	;; 20/02/2015
  1551                              <1> 	;;JC	short CL_DRV		; ERROR IN CMOS ASSUME NO DRIVE
  1552 00003A96 7440                <1> 	jz	short CL_DRV ;; 20/02/2015
  1553 00003A98 FEC8                <1> 	DEC	AL			; MAKE ZERO ORIGIN
  1554                              <1> 	;;JS	short CL_DRV		; NO DRIVE IF AL 0
  1555 00003A9A 8AA7[55590100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; AH = CURRENT STATE
  1556 00003AA0 80E40F              <1> 	AND	AH, ~(MED_DET+DBL_STEP+RATE_MSK) ; CLEAR
  1557 00003AA3 08C0                <1> 	OR	AL,AL			; CHECK FOR 360
  1558 00003AA5 7505                <1> 	JNZ	short N_360		; IF 360 WILL BE 0
  1559 00003AA7 80CC90              <1> 	OR	AH,MED_DET+RATE_250	; ESTABLISH MEDIA
  1560 00003AAA EB25                <1> 	JMP	SHORT SKP_STATE		; SKIP OTHER STATE PROCESSING
  1561                              <1> N_360:	
  1562 00003AAC FEC8                <1> 	DEC	AL			; 1.2 M DRIVE
  1563 00003AAE 7505                <1> 	JNZ	short N_12		; JUMP IF NOT
  1564                              <1> F1_RATE:
  1565 00003AB0 80CC10              <1> 	OR	AH,MED_DET+RATE_500	; SET FORMAT RATE
  1566 00003AB3 EB1C                <1> 	JMP	SHORT SKP_STATE		; SKIP OTHER STATE PROCESSING
  1567                              <1> N_12:	
  1568 00003AB5 FEC8                <1> 	DEC	AL			; CHECK FOR TYPE 3
  1569 00003AB7 750F                <1> 	JNZ	short N_720		; JUMP IF NOT
  1570 00003AB9 F6C404              <1> 	TEST	AH,DRV_DET		; IS DRIVE DETERMINED
  1571 00003ABC 7410                <1> 	JZ	short ISNT_12		; TREAT AS NON 1.2 DRIVE
  1572 00003ABE F6C402              <1> 	TEST	AH,FMT_CAPA		; IS 1.2M
  1573 00003AC1 740B                <1> 	JZ	short ISNT_12		; JUMP IF NOT
  1574 00003AC3 80CC50              <1> 	OR	AH,MED_DET+RATE_300	; RATE 300
  1575 00003AC6 EB09                <1> 	JMP	SHORT SKP_STATE		; CONTINUE
  1576                              <1> N_720:
  1577 00003AC8 FEC8                <1> 	DEC	AL			; CHECK FOR TYPE 4
  1578 00003ACA 750C                <1> 	JNZ	short CL_DRV		; NO DRIVE, CMOS BAD
  1579 00003ACC EBE2                <1> 	JMP	SHORT F1_RATE
  1580                              <1> ISNT_12: 
  1581 00003ACE 80CC90              <1> 	OR	AH,MED_DET+RATE_250	; MUST BE RATE 250
  1582                              <1> 
  1583                              <1> SKP_STATE:
  1584 00003AD1 88A7[55590100]      <1> 	MOV	[DSK_STATE+eDI], AH	; STORE AWAY
  1585                              <1> F1_OUT:
  1586 00003AD7 C3                  <1> 	RETn
  1587                              <1> CL_DRV:	
  1588 00003AD8 30E4                <1> 	XOR	AH,AH			; CLEAR STATE
  1589 00003ADA EBF5                <1> 	JMP	SHORT SKP_STATE		; SAVE IT
  1590                              <1> 
  1591                              <1> ;-------------------------------------------------------------------------------
  1592                              <1> ; MED_CHANGE	
  1593                              <1> ;	CHECKS FOR MEDIA CHANGE, RESETS MEDIA CHANGE, 
  1594                              <1> ;	CHECKS MEDIA CHANGE AGAIN.
  1595                              <1> ;
  1596                              <1> ; ON EXIT:	CY = 1 MEANS MEDIA CHANGE OR TIMEOUT
  1597                              <1> ;		@DSKETTE_STATUS = ERROR CODE
  1598                              <1> ;-------------------------------------------------------------------------------
  1599                              <1> MED_CHANGE:
  1600 00003ADC E888060000          <1> 	CALL	READ_DSKCHNG		; READ DISK CHANCE LINE STATE
  1601 00003AE1 7447                <1> 	JZ	short MC_OUT		; BYPASS HANDLING DISK CHANGE LINE
  1602 00003AE3 80A7[55590100]EF    <1> 	AND	byte [DSK_STATE+eDI], ~MED_DET ; CLEAR STATE FOR THIS DRIVE
  1603                              <1> 
  1604                              <1> ;	THIS SEQUENCE ENSURES WHENEVER A DISKETTE IS CHANGED THAT
  1605                              <1> ;	ON THE NEXT OPERATION THE REQUIRED MOTOR START UP TIME WILL
  1606                              <1> ;	BE WAITED. (DRIVE MOTOR MAY GO OFF UPON DOOR OPENING).
  1607                              <1> 
  1608 00003AEA 6689F9              <1> 	MOV	CX,DI			; CL = DRIVE 0
  1609 00003AED B001                <1> 	MOV	AL,1			; MOTOR ON BIT MASK
  1610 00003AEF D2E0                <1> 	SHL	AL,CL			; TO APPROPRIATE POSITION
  1611 00003AF1 F6D0                <1> 	NOT	AL			; KEEP ALL BUT MOTOR ON
  1612 00003AF3 FA                  <1> 	CLI				; NO INTERRUPTS
  1613 00003AF4 2005[46590100]      <1> 	AND	[MOTOR_STATUS], AL	; TURN MOTOR OFF INDICATOR
  1614 00003AFA FB                  <1> 	STI				; INTERRUPTS ENABLED
  1615 00003AFB E810040000          <1> 	CALL	MOTOR_ON		; TURN MOTOR ON
  1616                              <1> 
  1617                              <1> ;-----	THIS SEQUENCE OF SEEKS IS USED TO RESET DISKETTE CHANGE SIGNAL
  1618                              <1> 
  1619 00003B00 E850F9FFFF          <1> 	CALL	DSK_RESET		; RESET NEC
  1620 00003B05 B501                <1> 	MOV	CH,01H			; MOVE TO CYLINDER 1
  1621 00003B07 E8FF040000          <1> 	CALL	SEEK			; ISSUE SEEK
  1622 00003B0C 30ED                <1> 	XOR	CH,CH			; MOVE TO CYLINDER 0
  1623 00003B0E E8F8040000          <1> 	CALL	SEEK			; ISSUE SEEK
  1624 00003B13 C605[48590100]06    <1> 	MOV	byte [DSKETTE_STATUS], MEDIA_CHANGE ; STORE IN STATUS
  1625                              <1> OK1:
  1626 00003B1A E84A060000          <1> 	CALL	READ_DSKCHNG		; CHECK MEDIA CHANGED AGAIN
  1627 00003B1F 7407                <1> 	JZ	short OK2		; IF ACTIVE, NO DISKETTE, TIMEOUT
  1628                              <1> OK4:
  1629 00003B21 C605[48590100]80    <1> 	MOV	byte [DSKETTE_STATUS], TIME_OUT ; TIMEOUT IF DRIVE EMPTY
  1630                              <1> OK2:		
  1631 00003B28 F9                  <1> 	STC				; MEDIA CHANGED, SET CY
  1632 00003B29 C3                  <1> 	RETn
  1633                              <1> MC_OUT:
  1634 00003B2A F8                  <1> 	CLC				; NO MEDIA CHANGED, CLEAR CY
  1635 00003B2B C3                  <1> 	RETn
  1636                              <1> 
  1637                              <1> ;-------------------------------------------------------------------------------
  1638                              <1> ; SEND_RATE
  1639                              <1> ;	SENDS DATA RATE COMMAND TO NEC
  1640                              <1> ; ON ENTRY:	DI = DRIVE #
  1641                              <1> ; ON EXIT:	NONE
  1642                              <1> ; REGISTERS ALTERED: DX
  1643                              <1> ;-------------------------------------------------------------------------------
  1644                              <1> SEND_RATE:
  1645 00003B2C 6650                <1> 	PUSH	AX			; SAVE REG.
  1646 00003B2E 8025[50590100]3F    <1> 	AND	byte [LASTRATE], ~SEND_MSK ; ELSE CLEAR LAST RATE ATTEMPTED
  1647 00003B35 8A87[55590100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET RATE STATE OF THIS DRIVE
  1648 00003B3B 24C0                <1> 	AND	AL,SEND_MSK		; KEEP ONLY RATE BITS
  1649 00003B3D 0805[50590100]      <1> 	OR	[LASTRATE], AL		; SAVE NEW RATE FOR NEXT CHECK
  1650 00003B43 C0C002              <1> 	ROL	AL,2			; MOVE TO BIT OUTPUT POSITIONS
  1651 00003B46 66BAF703            <1> 	MOV	DX,03F7H		; OUTPUT NEW DATA RATE
  1652 00003B4A EE                  <1> 	OUT	DX,AL
  1653 00003B4B 6658                <1> 	POP	AX			; RESTORE REG.
  1654 00003B4D C3                  <1> 	RETn
  1655                              <1> 
  1656                              <1> ;-------------------------------------------------------------------------------
  1657                              <1> ; CHK_LASTRATE
  1658                              <1> ;	CHECK PREVIOUS DATE RATE SNT TO THE CONTROLLER.
  1659                              <1> ; ON ENTRY:
  1660                              <1> ;	DI = DRIVE #
  1661                              <1> ; ON EXIT:
  1662                              <1> ;	ZF =  1 DATA RATE IS THE SAME AS THE LAST RATE SENT TO NEC
  1663                              <1> ;	ZF =  0 DATA RATE IS DIFFERENT FROM LAST RATE
  1664                              <1> ; REGISTERS ALTERED: DX
  1665                              <1> ;-------------------------------------------------------------------------------
  1666                              <1> CHK_LASTRATE:
  1667 00003B4E 6650                <1> 	PUSH	AX			; SAVE REG
  1668 00003B50 2225[50590100]      <1> 	AND	AH, [LASTRATE]		; GET LAST DATA RATE SELECTED
  1669 00003B56 8A87[55590100]      <1> 	MOV	AL, [DSK_STATE+eDI]	; GET RATE STATE OF THIS DRIVE
  1670 00003B5C 6625C0C0            <1>         AND     AX, SEND_MSK*257        ; KEEP ONLY RATE BITS OF BOTH
  1671 00003B60 38E0                <1> 	CMP	AL, AH			; COMPARE TO PREVIOUSLY TRIED
  1672                              <1> 					; ZF = 1 RATE IS THE SAME
  1673 00003B62 6658                <1> 	POP	AX			; RESTORE REG.
  1674 00003B64 C3                  <1> 	RETn
  1675                              <1> 
  1676                              <1> ;-------------------------------------------------------------------------------
  1677                              <1> ; DMA_SETUP
  1678                              <1> ;	THIS ROUTINE SETS UP THE DMA FOR READ/WRITE/VERIFY OPERATIONS.
  1679                              <1> ;
  1680                              <1> ; ON ENTRY:	AL = DMA COMMAND
  1681                              <1> ;
  1682                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1683                              <1> ;-------------------------------------------------------------------------------
  1684                              <1> 
  1685                              <1> ; SI = Head #, # of Sectors or DASD Type
  1686                              <1> 
  1687                              <1> ; 22/08/2015
  1688                              <1> ; 08/02/2015 - Protected Mode Modification
  1689                              <1> ; 06/02/2015 - 07/02/2015
  1690                              <1> ; NOTE: Buffer address must be in 1st 16MB of Physical Memory (24 bit limit).
  1691                              <1> ; (DMA Addres = Physical Address)
  1692                              <1> ; (Retro UNIX 386 v1 Kernel/System Mode Virtual Address = Physical Address)
  1693                              <1> ;
  1694                              <1> 
  1695                              <1> 
  1696                              <1> ; 04/02/2016 (clc)
  1697                              <1> ; 20/02/2015 modification (source: AWARD BIOS 1999, DMA_SETUP)
  1698                              <1> ; 16/12/2014 (IODELAY)
  1699                              <1> 
  1700                              <1> DMA_SETUP:
  1701                              <1> 
  1702                              <1> ;; 20/02/2015
  1703 00003B65 8B5504              <1> 	mov	edx, [ebp+4] 		; Buffer address
  1704 00003B68 F7C2000000FF        <1> 	test	edx, 0FF000000h		; 16 MB limit (22/08/2015, bugfix)
  1705 00003B6E 756E                <1> 	jnz	short dma_bnd_err_stc
  1706                              <1> 	;
  1707 00003B70 6650                <1> 	push	ax			; DMA command
  1708 00003B72 52                  <1> 	push	edx			; *
  1709 00003B73 B203                <1> 	mov	dl, 3			; GET BYTES/SECTOR PARAMETER
  1710 00003B75 E851030000          <1> 	call	GET_PARM		; 
  1711 00003B7A 88E1                <1> 	mov	cl, ah 			; SHIFT COUNT (0=128, 1=256, 2=512 ETC)
  1712 00003B7C 6689F0              <1> 	mov	ax, si			; Sector count
  1713 00003B7F 88C4                <1> 	mov	ah, al			; AH =  # OF SECTORS
  1714 00003B81 28C0                <1> 	sub	al, al			; AL = 0, AX = # SECTORS * 256
  1715 00003B83 66D1E8              <1> 	shr	ax, 1			; AX = # SECTORS * 128
  1716 00003B86 66D3E0              <1> 	shl	ax, cl			; SHIFT BY PARAMETER VALUE
  1717 00003B89 6648                <1> 	dec	ax			; -1 FOR DMA VALUE
  1718 00003B8B 6689C1              <1> 	mov	cx, ax
  1719 00003B8E 5A                  <1> 	pop	edx			; *
  1720 00003B8F 6658                <1> 	pop	ax
  1721 00003B91 3C42                <1> 	cmp	al, 42h
  1722 00003B93 7507                <1>         jne     short NOT_VERF
  1723 00003B95 BA0000FF00          <1> 	mov	edx, 0FF0000h
  1724 00003B9A EB08                <1> 	jmp	short J33
  1725                              <1> NOT_VERF:
  1726 00003B9C 6601CA              <1> 	add	dx, cx			; check for overflow
  1727 00003B9F 723E                <1> 	jc	short dma_bnd_err
  1728                              <1> 	;
  1729 00003BA1 6629CA              <1> 	sub	dx, cx			; Restore start address
  1730                              <1> J33:
  1731 00003BA4 FA                  <1> 	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1732 00003BA5 E60C                <1> 	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1733                              <1> 	IODELAY				; WAIT FOR I/O
  1733 00003BA7 EB00                <2>  jmp short $+2
  1733 00003BA9 EB00                <2>  jmp short $+2
  1734 00003BAB E60B                <1> 	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1735 00003BAD 89D0                <1> 	mov	eax, edx		; Buffer address
  1736 00003BAF E604                <1> 	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1737                              <1> 	IODELAY				; WAIT FOR I/O
  1737 00003BB1 EB00                <2>  jmp short $+2
  1737 00003BB3 EB00                <2>  jmp short $+2
  1738 00003BB5 88E0                <1> 	MOV	AL,AH
  1739 00003BB7 E604                <1> 	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1740 00003BB9 C1E810              <1> 	shr	eax, 16
  1741                              <1> 	IODELAY				; I/O WAIT STATE
  1741 00003BBC EB00                <2>  jmp short $+2
  1741 00003BBE EB00                <2>  jmp short $+2
  1742 00003BC0 E681                <1> 	OUT	081H,AL			; OUTPUT highest BITS TO PAGE REGISTER
  1743                              <1> 	IODELAY
  1743 00003BC2 EB00                <2>  jmp short $+2
  1743 00003BC4 EB00                <2>  jmp short $+2
  1744 00003BC6 6689C8              <1> 	mov	ax, cx			; Byte count - 1
  1745 00003BC9 E605                <1> 	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1746                              <1> 	IODELAY				; WAIT FOR I/O
  1746 00003BCB EB00                <2>  jmp short $+2
  1746 00003BCD EB00                <2>  jmp short $+2
  1747 00003BCF 88E0                <1> 	MOV	AL, AH
  1748 00003BD1 E605                <1> 	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1749                              <1> 	IODELAY
  1749 00003BD3 EB00                <2>  jmp short $+2
  1749 00003BD5 EB00                <2>  jmp short $+2
  1750 00003BD7 FB                  <1> 	STI				; RE-ENABLE INTERRUPTS
  1751 00003BD8 B002                <1> 	MOV	AL, 2			; MODE FOR 8237
  1752 00003BDA E60A                <1> 	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1753                              <1> 
  1754 00003BDC F8                  <1> 	clc	; 04/02/2016
  1755 00003BDD C3                  <1> 	retn
  1756                              <1> 
  1757                              <1> dma_bnd_err_stc:
  1758 00003BDE F9                  <1> 	stc
  1759                              <1> dma_bnd_err:
  1760 00003BDF C605[48590100]09    <1> 	MOV	byte [DSKETTE_STATUS], DMA_BOUNDARY ; SET ERROR
  1761 00003BE6 C3                  <1> 	RETn				; CY SET BY ABOVE IF ERROR
  1762                              <1> 
  1763                              <1> ;; 16/12/2014
  1764                              <1> ;;	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1765                              <1> ;;	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1766                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1767                              <1> ;;	IODELAY
  1768                              <1> ;; 	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1769                              <1> ;;	;SIODELAY
  1770                              <1> ;;      ;CMP	AL, 42H			; DMA VERIFY COMMAND
  1771                              <1> ;;      ;JNE	short NOT_VERF		; NO
  1772                              <1> ;;      ;XOR	AX, AX			; START ADDRESS
  1773                              <1> ;;      ;JMP	SHORT J33
  1774                              <1> ;;;NOT_VERF:	
  1775                              <1> ;;	;MOV	AX,ES			; GET THE ES VALUE
  1776                              <1> ;;	;ROL	AX,4			; ROTATE LEFT
  1777                              <1> ;;	;MOV	CH,AL			; GET HIGHEST NIBBLE OF ES TO CH
  1778                              <1> ;;	;AND	AL,11110000B		; ZERO THE LOW NIBBLE FROM SEGMENT
  1779                              <1> ;;	;ADD	AX,[BP+2]		; TEST FOR CARRY FROM ADDITION
  1780                              <1> ;;	mov	eax, [ebp+4] ; 06/02/2015	
  1781                              <1> ;;	;JNC	short J33
  1782                              <1> ;;	;INC	CH			; CARRY MEANS HIGH 4 BITS MUST BE INC
  1783                              <1> ;;;J33:
  1784                              <1> ;;	PUSH	eAX			; SAVE START ADDRESS
  1785                              <1> ;;	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1786                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1787                              <1> ;;	IODELAY
  1788                              <1> ;;	MOV	AL,AH
  1789                              <1> ;;	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1790                              <1> ;;	shr	eax, 16	     ; 07/02/2015
  1791                              <1> ;;	;MOV	AL,CH			; GET HIGH 4 BITS
  1792                              <1> ;;	;JMP	$+2			; I/O WAIT STATE
  1793                              <1> ;;	IODELAY
  1794                              <1> ;;	;AND	AL,00001111B
  1795                              <1> ;;	OUT	081H,AL			; OUTPUT HIGH 4 BITS TO PAGE REGISTER
  1796                              <1> ;;	;SIODELAY
  1797                              <1> ;;
  1798                              <1> ;;;----- DETERMINE COUNT
  1799                              <1> ;;	sub	eax, eax ; 08/02/2015
  1800                              <1> ;;	MOV	AX, SI			; AL =  # OF SECTORS
  1801                              <1> ;;	XCHG	AL, AH			; AH =  # OF SECTORS
  1802                              <1> ;;	SUB	AL, AL			; AL = 0, AX = # SECTORS * 256
  1803                              <1> ;;	SHR	AX, 1			; AX = # SECTORS * 128
  1804                              <1> ;;	PUSH	AX			; SAVE # OF SECTORS * 128
  1805                              <1> ;;	MOV	DL, 3			; GET BYTES/SECTOR PARAMETER
  1806                              <1> ;;	CALL	GET_PARM		; "
  1807                              <1> ;;	MOV	CL,AH			; SHIFT COUNT (0=128, 1=256, 2=512 ETC)
  1808                              <1> ;;	POP	AX			; AX = # SECTORS * 128
  1809                              <1> ;;	SHL	AX,CL			; SHIFT BY PARAMETER VALUE
  1810                              <1> ;;	DEC	AX			; -1 FOR DMA VALUE
  1811                              <1> ;;	PUSH	eAX  ; 08/02/2015	; SAVE COUNT VALUE
  1812                              <1> ;;	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1813                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1814                              <1> ;;	IODELAY
  1815                              <1> ;;	MOV	AL, AH
  1816                              <1> ;;	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1817                              <1> ;;	;IODELAY
  1818                              <1> ;;	STI				; RE-ENABLE INTERRUPTS
  1819                              <1> ;;	POP	eCX  ; 08/02/2015 	; RECOVER COUNT VALUE
  1820                              <1> ;;	POP	eAX  ; 08/02/2015	; RECOVER ADDRESS VALUE
  1821                              <1> ;;	;ADD	AX, CX			; ADD, TEST FOR 64K OVERFLOW
  1822                              <1> ;;	add	ecx, eax ; 08/02/2015
  1823                              <1> ;;	MOV	AL, 2			; MODE FOR 8237
  1824                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1825                              <1> ;;	SIODELAY
  1826                              <1> ;;	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1827                              <1> ;;	;JNC	short NO_BAD		; CHECK FOR ERROR
  1828                              <1> ;;	jc	short dma_bnd_err ; 08/02/2015
  1829                              <1> ;;	and	ecx, 0FFF00000h ; 16 MB limit
  1830                              <1> ;;	jz	short NO_BAD
  1831                              <1> ;;dma_bnd_err:
  1832                              <1> ;;	MOV	byte [DSKETTE_STATUS], DMA_BOUNDARY ; SET ERROR
  1833                              <1> ;;NO_BAD:
  1834                              <1> ;;	RETn				; CY SET BY ABOVE IF ERROR
  1835                              <1> 
  1836                              <1> ;-------------------------------------------------------------------------------
  1837                              <1> ; FMTDMA_SET
  1838                              <1> ;	THIS ROUTINE SETS UP THE DMA CONTROLLER FOR A FORMAT OPERATION.
  1839                              <1> ;
  1840                              <1> ; ON ENTRY:	NOTHING REQUIRED
  1841                              <1> ;
  1842                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1843                              <1> ;-------------------------------------------------------------------------------
  1844                              <1> 
  1845                              <1> FMTDMA_SET:
  1846                              <1> ;; 20/02/2015 modification	
  1847 00003BE7 8B5504              <1> 	mov	edx, [ebp+4] 		; Buffer address
  1848 00003BEA F7C20000F0FF        <1> 	test	edx, 0FFF00000h		; 16 MB limit
  1849 00003BF0 75EC                <1> 	jnz	short dma_bnd_err_stc
  1850                              <1> 	;
  1851 00003BF2 6652                <1> 	push	dx			; *
  1852 00003BF4 B204                <1> 	mov	DL, 4			; SECTORS/TRACK VALUE IN PARM TABLE
  1853 00003BF6 E8D0020000          <1> 	call	GET_PARM		; "
  1854 00003BFB 88E0                <1> 	mov	al, ah			; AL = SECTORS/TRACK VALUE
  1855 00003BFD 28E4                <1> 	sub	ah, ah			; AX = SECTORS/TRACK VALUE
  1856 00003BFF 66C1E002            <1> 	shl	ax, 2			; AX = SEC/TRK * 4 (OFFSET C,H,R,N)
  1857 00003C03 6648                <1> 	dec	ax			; -1 FOR DMA VALUE
  1858 00003C05 6689C1              <1> 	mov	cx, ax
  1859 00003C08 665A                <1> 	pop	dx			; *
  1860 00003C0A 6601CA              <1> 	add	dx, cx			; check for overflow
  1861 00003C0D 72D0                <1> 	jc	short dma_bnd_err
  1862                              <1> 	;
  1863 00003C0F 6629CA              <1> 	sub	dx, cx			; Restore start address
  1864                              <1> 	;
  1865 00003C12 B04A                <1> 	MOV	AL, 04AH		; WILL WRITE TO THE DISKETTE
  1866 00003C14 FA                  <1> 	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1867 00003C15 E60C                <1> 	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1868                              <1> 	IODELAY				; WAIT FOR I/O
  1868 00003C17 EB00                <2>  jmp short $+2
  1868 00003C19 EB00                <2>  jmp short $+2
  1869 00003C1B E60B                <1> 	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1870 00003C1D 89D0                <1> 	mov	eax, edx		; Buffer address
  1871 00003C1F E604                <1> 	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1872                              <1> 	IODELAY				; WAIT FOR I/O
  1872 00003C21 EB00                <2>  jmp short $+2
  1872 00003C23 EB00                <2>  jmp short $+2
  1873 00003C25 88E0                <1> 	MOV	AL,AH
  1874 00003C27 E604                <1> 	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1875 00003C29 C1E810              <1> 	shr	eax, 16
  1876                              <1> 	IODELAY				; I/O WAIT STATE
  1876 00003C2C EB00                <2>  jmp short $+2
  1876 00003C2E EB00                <2>  jmp short $+2
  1877 00003C30 E681                <1> 	OUT	081H,AL			; OUTPUT highest BITS TO PAGE REGISTER
  1878                              <1> 	IODELAY
  1878 00003C32 EB00                <2>  jmp short $+2
  1878 00003C34 EB00                <2>  jmp short $+2
  1879 00003C36 6689C8              <1> 	mov	ax, cx			; Byte count - 1
  1880 00003C39 E605                <1> 	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1881                              <1> 	IODELAY				; WAIT FOR I/O
  1881 00003C3B EB00                <2>  jmp short $+2
  1881 00003C3D EB00                <2>  jmp short $+2
  1882 00003C3F 88E0                <1> 	MOV	AL, AH
  1883 00003C41 E605                <1> 	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1884                              <1> 	IODELAY
  1884 00003C43 EB00                <2>  jmp short $+2
  1884 00003C45 EB00                <2>  jmp short $+2
  1885 00003C47 FB                  <1> 	STI				; RE-ENABLE INTERRUPTS
  1886 00003C48 B002                <1> 	MOV	AL, 2			; MODE FOR 8237
  1887 00003C4A E60A                <1> 	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1888 00003C4C C3                  <1> 	retn
  1889                              <1> 
  1890                              <1> ;; 08/02/2015 - Protected Mode Modification
  1891                              <1> ;;	MOV	AL, 04AH		; WILL WRITE TO THE DISKETTE
  1892                              <1> ;;	CLI				; DISABLE INTERRUPTS DURING DMA SET-UP
  1893                              <1> ;;	OUT	DMA+12,AL		; SET THE FIRST/LA5T F/F
  1894                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1895                              <1> ;;	IODELAY
  1896                              <1> ;;	OUT	DMA+11,AL		; OUTPUT THE MODE BYTE
  1897                              <1> ;;	;MOV	AX,ES			; GET THE ES VALUE
  1898                              <1> ;;	;ROL	AX,4			; ROTATE LEFT
  1899                              <1> ;;	;MOV	CH,AL			; GET HIGHEST NIBBLE OF ES TO CH
  1900                              <1> ;;	;AND	AL,11110000B		; ZERO THE LOW NIBBLE FROM SEGMENT
  1901                              <1> ;;	;ADD	AX,[BP+2]		; TEST FOR CARRY FROM ADDITION
  1902                              <1> ;;	;JNC	short J33A
  1903                              <1> ;;	;INC	CH			; CARRY MEANS HIGH 4 BITS MUST BE INC
  1904                              <1> ;;	mov	eax, [ebp+4] ; 08/02/2015
  1905                              <1> ;;;J33A:
  1906                              <1> ;;	PUSH	eAX ; 08/02/2015	; SAVE START ADDRESS
  1907                              <1> ;;	OUT	DMA+4,AL		; OUTPUT LOW ADDRESS
  1908                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1909                              <1> ;;	IODELAY
  1910                              <1> ;;	MOV	AL,AH
  1911                              <1> ;;	OUT	DMA+4,AL		; OUTPUT HIGH ADDRESS
  1912                              <1> ;;	shr 	eax, 16 ; 08/02/2015
  1913                              <1> ;;	;MOV	AL,CH			; GET HIGH 4 BITS
  1914                              <1> ;;	;JMP	$+2			; I/O WAIT STATE
  1915                              <1> ;;	IODELAY
  1916                              <1> ;;	;AND	AL,00001111B
  1917                              <1> ;;	OUT	081H,AL			; OUTPUT HIGH 4 BITS TO PAGE REGISTER
  1918                              <1> ;;
  1919                              <1> ;;;----- DETERMINE COUNT
  1920                              <1> ;;	sub	eax, eax ; 08/02/2015
  1921                              <1> ;;	MOV	DL, 4			; SECTORS/TRACK VALUE IN PARM TABLE
  1922                              <1> ;;	CALL	GET_PARM		; "
  1923                              <1> ;;	XCHG	AL, AH			; AL = SECTORS/TRACK VALUE
  1924                              <1> ;;	SUB	AH, AH			; AX = SECTORS/TRACK VALUE
  1925                              <1> ;;	SHL	AX, 2			; AX = SEC/TRK * 4 (OFFSET C,H,R,N)
  1926                              <1> ;;	DEC	AX			; -1 FOR DMA VALUE
  1927                              <1> ;;	PUSH	eAX 	; 08/02/2015	; SAVE # OF BYTES TO BE TRANSFERED
  1928                              <1> ;;	OUT	DMA+5,AL		; LOW BYTE OF COUNT
  1929                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1930                              <1> ;;	IODELAY
  1931                              <1> ;;	MOV	AL, AH
  1932                              <1> ;;	OUT	DMA+5,AL		; HIGH BYTE OF COUNT
  1933                              <1> ;;	STI				; RE-ENABLE INTERRUPTS
  1934                              <1> ;;	POP	eCX	; 08/02/2015	; RECOVER COUNT VALUE
  1935                              <1> ;;	POP	eAX	; 08/02/2015	; RECOVER ADDRESS VALUE
  1936                              <1> ;;	;ADD	AX, CX			; ADD, TEST FOR 64K OVERFLOW
  1937                              <1> ;;	add	ecx, eax ; 08/02/2015
  1938                              <1> ;;	MOV	AL, 2			; MODE FOR 8237
  1939                              <1> ;;	;JMP	$+2			; WAIT FOR I/O
  1940                              <1> ;;	SIODELAY
  1941                              <1> ;;	OUT	DMA+10, AL		; INITIALIZE THE DISKETTE CHANNEL
  1942                              <1> ;;	;JNC	short FMTDMA_OK		; CHECK FOR ERROR
  1943                              <1> ;;	jc	short fmtdma_bnd_err ; 08/02/2015
  1944                              <1> ;;	and	ecx, 0FFF00000h  ; 16 MB limit
  1945                              <1> ;;	jz	short FMTDMA_OK
  1946                              <1> ;;	stc	; 20/02/2015
  1947                              <1> ;;fmtdma_bnd_err:
  1948                              <1> ;;	MOV	byte [DSKETTE_STATUS], DMA_BOUNDARY ; SET ERROR
  1949                              <1> ;;FMTDMA_OK:
  1950                              <1> ;;	RETn				; CY SET BY ABOVE IF ERROR
  1951                              <1> 
  1952                              <1> ;-------------------------------------------------------------------------------
  1953                              <1> ; NEC_INIT	
  1954                              <1> ;	THIS ROUTINE SEEKS TO THE REQUESTED TRACK AND INITIALIZES
  1955                              <1> ;	THE NEC FOR THE READ/WRITE/VERIFY/FORMAT OPERATION.
  1956                              <1> ;
  1957                              <1> ; ON ENTRY:	AH = NEC COMMAND TO BE PERFORMED
  1958                              <1> ;
  1959                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1960                              <1> ;-------------------------------------------------------------------------------
  1961                              <1> NEC_INIT:
  1962 00003C4D 6650                <1> 	PUSH	AX			; SAVE NEC COMMAND
  1963 00003C4F E8BC020000          <1> 	CALL	MOTOR_ON		; TURN MOTOR ON FOR SPECIFIC DRIVE
  1964                              <1> 
  1965                              <1> ;-----	DO THE SEEK OPERATION
  1966                              <1> 
  1967 00003C54 8A6D01              <1> 	MOV	CH,[eBP+1]		; CH = TRACK #
  1968 00003C57 E8AF030000          <1> 	CALL	SEEK			; MOVE TO CORRECT TRACK
  1969 00003C5C 6658                <1> 	POP	AX			; RECOVER COMMAND
  1970 00003C5E 721E                <1> 	JC	short ER_1		; ERROR ON SEEK
  1971 00003C60 BB[7E3C0000]        <1> 	MOV	eBX, ER_1		; LOAD ERROR ADDRESS
  1972 00003C65 53                  <1> 	PUSH	eBX			; PUSH NEC_OUT ERROR RETURN
  1973                              <1> 
  1974                              <1> ;-----	SEND OUT THE PARAMETERS TO THE CONTROLLER
  1975                              <1> 
  1976 00003C66 E866030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE OPERATION COMMAND
  1977 00003C6B 6689F0              <1> 	MOV	AX,SI			; AH = HEAD #
  1978 00003C6E 89FB                <1> 	MOV	eBX,eDI			; BL = DRIVE #
  1979 00003C70 C0E402              <1> 	SAL	AH,2			; MOVE IT TO BIT 2
  1980 00003C73 80E404              <1> 	AND	AH,00000100B		; ISOLATE THAT BIT
  1981 00003C76 08DC                <1> 	OR	AH,BL			; OR IN THE DRIVE NUMBER
  1982 00003C78 E854030000          <1> 	CALL	NEC_OUTPUT		; FALL THRU CY SET IF ERROR
  1983 00003C7D 5B                  <1> 	POP	eBX			; THROW AWAY ERROR RETURN
  1984                              <1> ER_1:
  1985 00003C7E C3                  <1> 	RETn
  1986                              <1> 
  1987                              <1> ;-------------------------------------------------------------------------------
  1988                              <1> ; RWV_COM
  1989                              <1> ;	THIS ROUTINE SENDS PARAMETERS TO THE NEC SPECIFIC TO THE 
  1990                              <1> ;	READ/WRITE/VERIFY OPERATIONS.
  1991                              <1> ;
  1992                              <1> ; ON ENTRY:	CS:BX = ADDRESS OF MEDIA/DRIVE PARAMETER TABLE
  1993                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  1994                              <1> ;-------------------------------------------------------------------------------
  1995                              <1> RWV_COM:
  1996 00003C7F B8[CA3C0000]        <1> 	MOV	eAX, ER_2		; LOAD ERROR ADDRESS
  1997 00003C84 50                  <1> 	PUSH	eAX			; PUSH NEC_OUT ERROR RETURN
  1998 00003C85 8A6501              <1> 	MOV	AH,[eBP+1]		; OUTPUT TRACK #
  1999 00003C88 E844030000          <1> 	CALL	NEC_OUTPUT
  2000 00003C8D 6689F0              <1> 	MOV	AX,SI			; OUTPUT HEAD #
  2001 00003C90 E83C030000          <1> 	CALL	NEC_OUTPUT
  2002 00003C95 8A6500              <1>         MOV     AH,[eBP]                ; OUTPUT SECTOR #
  2003 00003C98 E834030000          <1> 	CALL	NEC_OUTPUT
  2004 00003C9D B203                <1> 	MOV	DL,3			; BYTES/SECTOR PARAMETER FROM BLOCK
  2005 00003C9F E827020000          <1> 	CALL	GET_PARM 		; ... TO THE NEC
  2006 00003CA4 E828030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO CONTROLLER
  2007 00003CA9 B204                <1> 	MOV	DL,4			; EOT PARAMETER FROM BLOCK
  2008 00003CAB E81B020000          <1> 	CALL	GET_PARM 		; ... TO THE NEC
  2009 00003CB0 E81C030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO CONTROLLER
  2010 00003CB5 8A6305              <1>         MOV     AH, [eBX+MD.GAP]        ; GET GAP LENGTH
  2011                              <1> _R15:
  2012 00003CB8 E814030000          <1> 	CALL	NEC_OUTPUT
  2013 00003CBD B206                <1> 	MOV	DL,6			; DTL PARAMETER PROM BLOCK
  2014 00003CBF E807020000          <1> 	CALL	GET_PARM		;  TO THE NEC
  2015 00003CC4 E808030000          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO CONTROLLER
  2016 00003CC9 58                  <1> 	POP	eAX			; THROW AWAY ERROR EXIT
  2017                              <1> ER_2:
  2018 00003CCA C3                  <1> 	RETn
  2019                              <1> 
  2020                              <1> ;-------------------------------------------------------------------------------
  2021                              <1> ; NEC_TERM
  2022                              <1> ;	THIS ROUTINE WAITS FOR THE OPERATION THEN ACCEPTS THE STATUS 
  2023                              <1> ;	FROM THE NEC FOR THE READ/WRITE/VERIFY/FORWAT OPERATION.
  2024                              <1> ;
  2025                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  2026                              <1> ;-------------------------------------------------------------------------------
  2027                              <1> NEC_TERM:
  2028                              <1> 
  2029                              <1> ;-----	LET THE OPERATION HAPPEN
  2030                              <1> 
  2031 00003CCB 56                  <1> 	PUSH	eSI			; SAVE HEAD #, # OF SECTORS
  2032 00003CCC E80D040000          <1> 	CALL	WAIT_INT		; WAIT FOR THE INTERRUPT
  2033 00003CD1 9C                  <1> 	PUSHF
  2034 00003CD2 E837040000          <1> 	CALL	RESULTS			; GET THE NEC STATUS
  2035 00003CD7 724B                <1> 	JC	short SET_END_POP
  2036 00003CD9 9D                  <1> 	POPF
  2037 00003CDA 723E                <1> 	JC	short SET_END		; LOOK FOR ERROR
  2038                              <1> 
  2039                              <1> ;-----	CHECK THE RESULTS RETURNED BY THE CONTROLLER
  2040                              <1> 
  2041 00003CDC FC                  <1> 	CLD				; SET THE CORRECT DIRECTION
  2042 00003CDD BE[49590100]        <1> 	MOV	eSI, NEC_STATUS		; POINT TO STATUS FIELD
  2043 00003CE2 AC                  <1> 	lodsb				; GET ST0
  2044 00003CE3 24C0                <1> 	AND	AL,11000000B		; TEST FOR NORMAL TERMINATION
  2045 00003CE5 7433                <1> 	JZ	short SET_END
  2046 00003CE7 3C40                <1> 	CMP	AL,01000000B		; TEST FOR ABNORMAL TERMINATION
  2047 00003CE9 7527                <1> 	JNZ	short J18		; NOT ABNORMAL, BAD NEC
  2048                              <1> 
  2049                              <1> ;-----	ABNORMAL TERMINATION, FIND OUT WHY
  2050                              <1> 
  2051 00003CEB AC                  <1> 	lodsb				; GET ST1
  2052 00003CEC D0E0                <1> 	SAL	AL,1			; TEST FOR EDT FOUND
  2053 00003CEE B404                <1> 	MOV	AH,RECORD_NOT_FND
  2054 00003CF0 7222                <1> 	JC	short J19
  2055 00003CF2 C0E002              <1> 	SAL	AL,2
  2056 00003CF5 B410                <1> 	MOV	AH,BAD_CRC
  2057 00003CF7 721B                <1> 	JC	short J19
  2058 00003CF9 D0E0                <1> 	SAL	AL,1			; TEST FOR DMA OVERRUN
  2059 00003CFB B408                <1> 	MOV	AH,BAD_DMA
  2060 00003CFD 7215                <1> 	JC	short J19
  2061 00003CFF C0E002              <1> 	SAL	AL,2			; TEST FOR RECORD NOT FOUND
  2062 00003D02 B404                <1> 	MOV	AH,RECORD_NOT_FND
  2063 00003D04 720E                <1> 	JC	short J19
  2064 00003D06 D0E0                <1> 	SAL	AL,1
  2065 00003D08 B403                <1> 	MOV	AH,WRITE_PROTECT	; TEST FOR WRITE_PROTECT
  2066 00003D0A 7208                <1> 	JC	short J19
  2067 00003D0C D0E0                <1> 	SAL	AL,1			; TEST MISSING ADDRESS MARK
  2068 00003D0E B402                <1> 	MOV	AH,BAD_ADDR_MARK
  2069 00003D10 7202                <1> 	JC	short J19
  2070                              <1> 
  2071                              <1> ;----- 	NEC MUST HAVE FAILED
  2072                              <1> J18:
  2073 00003D12 B420                <1> 	MOV	AH,BAD_NEC
  2074                              <1> J19:
  2075 00003D14 0825[48590100]      <1> 	OR	[DSKETTE_STATUS], AH
  2076                              <1> SET_END:
  2077 00003D1A 803D[48590100]01    <1> 	CMP	byte [DSKETTE_STATUS], 1 ; SET ERROR CONDITION
  2078 00003D21 F5                  <1> 	CMC
  2079 00003D22 5E                  <1> 	POP	eSI
  2080 00003D23 C3                  <1> 	RETn				; RESTORE HEAD #, # OF SECTORS
  2081                              <1> 
  2082                              <1> SET_END_POP:
  2083 00003D24 9D                  <1> 	POPF
  2084 00003D25 EBF3                <1> 	JMP	SHORT SET_END
  2085                              <1> 
  2086                              <1> ;-------------------------------------------------------------------------------
  2087                              <1> ; DSTATE:	ESTABLISH STATE UPON SUCCESSFUL OPERATION.
  2088                              <1> ;-------------------------------------------------------------------------------
  2089                              <1> DSTATE:
  2090 00003D27 803D[48590100]00    <1> 	CMP	byte [DSKETTE_STATUS],0	; CHECK FOR ERROR
  2091 00003D2E 753E                <1> 	JNZ	short SETBAC		    ; IF ERROR JUMP
  2092 00003D30 808F[55590100]10    <1> 	OR	byte [DSK_STATE+eDI],MED_DET ; NO ERROR, MARK MEDIA AS DETERMINED
  2093 00003D37 F687[55590100]04    <1> 	TEST	byte [DSK_STATE+eDI],DRV_DET ; DRIVE DETERMINED ?
  2094 00003D3E 752E                <1> 	JNZ	short SETBAC		; IF DETERMINED NO TRY TO DETERMINE
  2095 00003D40 8A87[55590100]      <1> 	MOV	AL,[DSK_STATE+eDI]	; LOAD STATE
  2096 00003D46 24C0                <1> 	AND	AL,RATE_MSK		; KEEP ONLY RATE
  2097 00003D48 3C80                <1> 	CMP	AL,RATE_250		; RATE 250 ?
  2098 00003D4A 751B                <1> 	JNE	short M_12		; NO, MUST BE 1.2M OR 1.44M DRIVE
  2099                              <1> 
  2100                              <1> ;----- 	CHECK IF IT IS 1.44M
  2101                              <1> 
  2102 00003D4C E871010000          <1> 	CALL	CMOS_TYPE		; RETURN DRIVE TYPE IN (AL)
  2103                              <1> 	;;20/02/2015
  2104                              <1> 	;;JC	short M_12		; CMOS BAD
  2105 00003D51 7414                <1> 	jz	short M_12 ;; 20/02/2015
  2106 00003D53 3C04                <1> 	CMP	AL, 4			; 1.44MB DRIVE ?
  2107 00003D55 7410                <1> 	JE	short M_12		; YES
  2108                              <1> M_720:
  2109 00003D57 80A7[55590100]FD    <1> 	AND	byte [DSK_STATE+eDI], ~FMT_CAPA ; TURN OFF FORMAT CAPABILITY
  2110 00003D5E 808F[55590100]04    <1> 	OR	byte [DSK_STATE+eDI],DRV_DET  ; MARK DRIVE DETERMINED
  2111 00003D65 EB07                <1> 	JMP	SHORT SETBAC		; BACK
  2112                              <1> M_12:	
  2113 00003D67 808F[55590100]06    <1> 	OR	byte [DSK_STATE+eDI],DRV_DET+FMT_CAPA 
  2114                              <1> 					; TURN ON DETERMINED & FMT CAPA
  2115                              <1> SETBAC:
  2116 00003D6E C3                  <1> 	RETn
  2117                              <1> 
  2118                              <1> ;-------------------------------------------------------------------------------
  2119                              <1> ; RETRY	
  2120                              <1> ;	DETERMINES WHETHER A RETRY IS NECESSARY. 
  2121                              <1> ;	IF RETRY IS REQUIRED THEN STATE INFORMATION IS UPDATED FOR RETRY.
  2122                              <1> ;
  2123                              <1> ; ON EXIT:	CY = 1 FOR RETRY, CY = 0 FOR NO RETRY
  2124                              <1> ;-------------------------------------------------------------------------------
  2125                              <1> RETRY:
  2126 00003D6F 803D[48590100]00    <1> 	CMP	byte [DSKETTE_STATUS],0	; GET STATUS OF OPERATION
  2127 00003D76 7445                <1> 	JZ	short NO_RETRY		; SUCCESSFUL OPERATION
  2128 00003D78 803D[48590100]80    <1> 	CMP	byte [DSKETTE_STATUS],TIME_OUT ; IF TIME OUT NO RETRY
  2129 00003D7F 743C                <1> 	JZ	short NO_RETRY
  2130 00003D81 8AA7[55590100]      <1> 	MOV	AH,[DSK_STATE+eDI]	; GET MEDIA STATE OF DRIVE
  2131 00003D87 F6C410              <1> 	TEST	AH,MED_DET		; ESTABLISHED/DETERMINED ?
  2132 00003D8A 7531                <1> 	JNZ	short NO_RETRY		; IF ESTABLISHED STATE THEN TRUE ERROR
  2133 00003D8C 80E4C0              <1> 	AND	AH,RATE_MSK		; ISOLATE RATE
  2134 00003D8F 8A2D[50590100]      <1> 	MOV	CH,[LASTRATE]		; GET START OPERATION STATE
  2135 00003D95 C0C504              <1> 	ROL	CH,4			; TO CORRESPONDING BITS
  2136 00003D98 80E5C0              <1> 	AND	CH,RATE_MSK		; ISOLATE RATE BITS
  2137 00003D9B 38E5                <1> 	CMP	CH,AH			; ALL RATES TRIED
  2138 00003D9D 741E                <1> 	JE	short NO_RETRY		; IF YES, THEN TRUE ERROR
  2139                              <1> 
  2140                              <1> ;	SETUP STATE INDICATOR FOR RETRY ATTEMPT TO NEXT RATE
  2141                              <1> ;	 00000000B (500) -> 10000000B	(250)
  2142                              <1> ;	 10000000B (250) -> 01000000B	(300)
  2143                              <1> ;	 01000000B (300) -> 00000000B	(500)
  2144                              <1> 
  2145 00003D9F 80FC01              <1> 	CMP	AH,RATE_500+1		; SET CY FOR RATE 500
  2146 00003DA2 D0DC                <1> 	RCR	AH,1			; TO NEXT STATE
  2147 00003DA4 80E4C0              <1> 	AND	AH,RATE_MSK		; KEEP ONLY RATE BITS
  2148 00003DA7 80A7[55590100]1F    <1> 	AND	byte [DSK_STATE+eDI], ~(RATE_MSK+DBL_STEP)
  2149                              <1> 					; RATE, DBL STEP OFF
  2150 00003DAE 08A7[55590100]      <1> 	OR	[DSK_STATE+eDI],AH	; TURN ON NEW RATE
  2151 00003DB4 C605[48590100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; RESET STATUS FOR RETRY
  2152 00003DBB F9                  <1> 	STC				; SET CARRY FOR RETRY
  2153 00003DBC C3                  <1> 	RETn				; RETRY RETURN
  2154                              <1> 
  2155                              <1> NO_RETRY:
  2156 00003DBD F8                  <1> 	CLC				; CLEAR CARRY NO RETRY
  2157 00003DBE C3                  <1> 	RETn				; NO RETRY RETURN
  2158                              <1> 
  2159                              <1> ;-------------------------------------------------------------------------------
  2160                              <1> ; NUM_TRANS
  2161                              <1> ;	THIS ROUTINE CALCULATES THE NUMBER OF SECTORS THAT WERE
  2162                              <1> ;	ACTUALLY TRANSFERRED TO/FROM THE DISKETTE.
  2163                              <1> ;
  2164                              <1> ; ON ENTRY:	[BP+1] = TRACK
  2165                              <1> ;		SI-HI  = HEAD
  2166                              <1> ;		[BP]   = START SECTOR
  2167                              <1> ;
  2168                              <1> ; ON EXIT:	AL = NUMBER ACTUALLY TRANSFERRED
  2169                              <1> ;-------------------------------------------------------------------------------
  2170                              <1> NUM_TRANS:
  2171 00003DBF 30C0                <1> 	XOR	AL,AL			; CLEAR FOR ERROR
  2172 00003DC1 803D[48590100]00    <1> 	CMP	byte [DSKETTE_STATUS],0	; CHECK FOR ERROR
  2173 00003DC8 752C                <1> 	JNZ	NT_OUT			; IF ERROR 0 TRANSFERRED
  2174 00003DCA B204                <1> 	MOV	DL,4			; SECTORS/TRACK OFFSET TO DL
  2175 00003DCC E8FA000000          <1> 	CALL	GET_PARM		; AH = SECTORS/TRACK
  2176 00003DD1 8A1D[4E590100]      <1> 	MOV	BL, [NEC_STATUS+5]	; GET ENDING SECTOR
  2177 00003DD7 6689F1              <1> 	MOV	CX,SI			; CH = HEAD # STARTED
  2178 00003DDA 3A2D[4D590100]      <1> 	CMP	CH, [NEC_STATUS+4]	; GET HEAD ENDED UP ON
  2179 00003DE0 750D                <1> 	JNZ	DIF_HD			; IF ON SAME HEAD, THEN NO ADJUST
  2180 00003DE2 8A2D[4C590100]      <1> 	MOV	CH, [NEC_STATUS+3]	; GET TRACK ENDED UP ON
  2181 00003DE8 3A6D01              <1> 	CMP	CH,[eBP+1]		; IS IT ASKED FOR TRACK
  2182 00003DEB 7404                <1> 	JZ	short SAME_TRK		; IF SAME TRACK NO INCREASE
  2183 00003DED 00E3                <1> 	ADD	BL,AH			; ADD SECTORS/TRACK
  2184                              <1> DIF_HD:
  2185 00003DEF 00E3                <1> 	ADD	BL,AH			; ADD SECTORS/TRACK
  2186                              <1> SAME_TRK:
  2187 00003DF1 2A5D00              <1> 	SUB	BL,[eBP]		; SUBTRACT START FROM END
  2188 00003DF4 88D8                <1> 	MOV	AL,BL			; TO AL
  2189                              <1> NT_OUT:
  2190 00003DF6 C3                  <1> 	RETn
  2191                              <1> 
  2192                              <1> ;-------------------------------------------------------------------------------
  2193                              <1> ; SETUP_END
  2194                              <1> ;	RESTORES @MOTOR_COUNT TO PARAMETER PROVIDED IN TABLE 
  2195                              <1> ;	AND LOADS @DSKETTE_STATUS TO AH, AND SETS CY.
  2196                              <1> ;
  2197                              <1> ; ON EXIT:
  2198                              <1> ;	AH, @DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  2199                              <1> ;-------------------------------------------------------------------------------
  2200                              <1> SETUP_END:
  2201 00003DF7 B202                <1> 	MOV	DL,2			; GET THE MOTOR WAIT PARAMETER
  2202 00003DF9 6650                <1> 	PUSH	AX			; SAVE NUMBER TRANSFERRED
  2203 00003DFB E8CB000000          <1> 	CALL	GET_PARM
  2204 00003E00 8825[47590100]      <1> 	MOV	[MOTOR_COUNT],AH	; STORE UPON RETURN
  2205 00003E06 6658                <1> 	POP	AX			; RESTORE NUMBER TRANSFERRED
  2206 00003E08 8A25[48590100]      <1> 	MOV	AH, [DSKETTE_STATUS]	; GET STATUS OF OPERATION
  2207 00003E0E 08E4                <1> 	OR	AH,AH			; CHECK FOR ERROR
  2208 00003E10 7402                <1> 	JZ	short NUN_ERR		; NO ERROR
  2209 00003E12 30C0                <1> 	XOR	AL,AL			; CLEAR NUMBER RETURNED
  2210                              <1> NUN_ERR: 
  2211 00003E14 80FC01              <1> 	CMP	AH,1			; SET THE CARRY FLAG TO INDICATE
  2212 00003E17 F5                  <1> 	CMC				; SUCCESS OR FAILURE
  2213 00003E18 C3                  <1> 	RETn
  2214                              <1> 
  2215                              <1> ;-------------------------------------------------------------------------------
  2216                              <1> ; SETUP_DBL
  2217                              <1> ;	CHECK DOUBLE STEP.
  2218                              <1> ;
  2219                              <1> ; ON ENTRY :	DI = DRIVE
  2220                              <1> ;
  2221                              <1> ; ON EXIT :	CY = 1 MEANS ERROR
  2222                              <1> ;-------------------------------------------------------------------------------
  2223                              <1> SETUP_DBL:
  2224 00003E19 8AA7[55590100]      <1> 	MOV	AH, [DSK_STATE+eDI]	; ACCESS STATE
  2225 00003E1F F6C410              <1> 	TEST	AH,MED_DET		; ESTABLISHED STATE ?
  2226 00003E22 757E                <1> 	JNZ	short NO_DBL			; IF ESTABLISHED THEN DOUBLE DONE
  2227                              <1> 
  2228                              <1> ;-----	CHECK FOR TRACK 0 TO SPEED UP ACKNOWLEDGE OF UNFORMATTED DISKETTE
  2229                              <1> 
  2230 00003E24 C605[45590100]00    <1> 	MOV	byte [SEEK_STATUS],0	; SET RECALIBRATE REQUIRED ON ALL DRIVES
  2231 00003E2B E8E0000000          <1> 	CALL	MOTOR_ON		; ENSURE MOTOR STAY ON
  2232 00003E30 B500                <1> 	MOV	CH,0			; LOAD TRACK 0
  2233 00003E32 E8D4010000          <1> 	CALL	SEEK			; SEEK TO TRACK 0
  2234 00003E37 E868000000          <1> 	CALL	READ_ID			; READ ID FUNCTION
  2235 00003E3C 7249                <1> 	JC	short SD_ERR		; IF ERROR NO TRACK 0
  2236                              <1> 
  2237                              <1> ;-----	INITIALIZE START AND MAX TRACKS (TIMES 2 FOR BOTH HEADS)
  2238                              <1> 
  2239 00003E3E 66B95004            <1> 	MOV	CX,0450H 		; START, MAX TRACKS
  2240 00003E42 F687[55590100]01    <1> 	TEST	byte [DSK_STATE+eDI],TRK_CAPA ; TEST FOR 80 TRACK CAPABILITY
  2241 00003E49 7402                <1> 	JZ	short CNT_OK		; IF NOT COUNT IS SETUP
  2242 00003E4B B1A0                <1> 	MOV	CL,0A0H			; MAXIMUM TRACK 1.2 MB
  2243                              <1> 
  2244                              <1> ;	ATTEMPT READ ID OF ALL TRACKS, ALL HEADS UNTIL SUCCESS; UPON SUCCESS,
  2245                              <1> ;	MUST SEE IF ASKED FOR TRACK IN SINGLE STEP MODE = TRACK ID READ; IF NOT
  2246                              <1> ;	THEN SET DOUBLE STEP ON.
  2247                              <1> 
  2248                              <1> CNT_OK:
  2249 00003E4D C605[47590100]FF    <1>         MOV     byte [MOTOR_COUNT], 0FFH ; ENSURE MOTOR STAYS ON FOR OPERATION 
  2250 00003E54 6651                <1> 	PUSH	CX			; SAVE TRACK, COUNT
  2251 00003E56 C605[48590100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; CLEAR STATUS, EXPECT ERRORS
  2252 00003E5D 6631C0              <1> 	XOR	AX,AX			; CLEAR AX
  2253 00003E60 D0ED                <1> 	SHR	CH,1			; HALVE TRACK, CY = HEAD
  2254 00003E62 C0D003              <1> 	RCL	AL,3			; AX = HEAD IN CORRECT BIT
  2255 00003E65 6650                <1> 	PUSH	AX			; SAVE HEAD
  2256 00003E67 E89F010000          <1> 	CALL	SEEK			; SEEK TO TRACK
  2257 00003E6C 6658                <1> 	POP	AX			; RESTORE HEAD
  2258 00003E6E 6609C7              <1> 	OR	DI,AX			; DI = HEAD OR'ED DRIVE
  2259 00003E71 E82E000000          <1> 	CALL	READ_ID			; READ ID HEAD 0
  2260 00003E76 9C                  <1> 	PUSHF				; SAVE RETURN FROM READ_ID
  2261 00003E77 6681E7FB00          <1> 	AND	DI,11111011B		; TURN OFF HEAD 1 BIT
  2262 00003E7C 9D                  <1> 	POPF				; RESTORE ERROR RETURN
  2263 00003E7D 6659                <1> 	POP	CX			; RESTORE COUNT
  2264 00003E7F 7308                <1> 	JNC	short DO_CHK		; IF OK, ASKED = RETURNED TRACK ?
  2265 00003E81 FEC5                <1> 	INC	CH			; INC FOR NEXT TRACK
  2266 00003E83 38CD                <1> 	CMP	CH,CL			; REACHED MAXIMUM YET
  2267 00003E85 75C6                <1> 	JNZ	short CNT_OK		; CONTINUE TILL ALL TRIED
  2268                              <1> 
  2269                              <1> ;-----	FALL THRU, READ ID FAILED FOR ALL TRACKS
  2270                              <1> 
  2271                              <1> SD_ERR:	
  2272 00003E87 F9                  <1> 	STC				; SET CARRY FOR ERROR
  2273 00003E88 C3                  <1> 	RETn				; SETUP_DBL ERROR EXIT
  2274                              <1> 
  2275                              <1> DO_CHK:
  2276 00003E89 8A0D[4C590100]      <1> 	MOV	CL, [NEC_STATUS+3]	; LOAD RETURNED TRACK
  2277 00003E8F 888F[59590100]      <1> 	MOV	[DSK_TRK+eDI], CL	; STORE TRACK NUMBER
  2278 00003E95 D0ED                <1> 	SHR	CH,1			; HALVE TRACK
  2279 00003E97 38CD                <1> 	CMP	CH,CL			; IS IT THE SAME AS ASKED FOR TRACK
  2280 00003E99 7407                <1> 	JZ	short NO_DBL		; IF SAME THEN NO DOUBLE STEP
  2281 00003E9B 808F[55590100]20    <1> 	OR	byte [DSK_STATE+eDI],DBL_STEP ; TURN ON DOUBLE STEP REQUIRED
  2282                              <1> NO_DBL:
  2283 00003EA2 F8                  <1> 	CLC				; CLEAR ERROR FLAG
  2284 00003EA3 C3                  <1> 	RETn
  2285                              <1> 
  2286                              <1> ;-------------------------------------------------------------------------------
  2287                              <1> ; READ_ID
  2288                              <1> ;	READ ID FUNCTION.
  2289                              <1> ;
  2290                              <1> ; ON ENTRY:	DI : BIT 2 = HEAD; BITS 1,0 = DRIVE
  2291                              <1> ;
  2292                              <1> ; ON EXIT: 	DI : BIT 2 IS RESET, BITS 1,0 = DRIVE
  2293                              <1> ;		@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION
  2294                              <1> ;-------------------------------------------------------------------------------
  2295                              <1> READ_ID:
  2296 00003EA4 B8[C13E0000]        <1> 	MOV	eAX, ER_3		; MOVE NEC OUTPUT ERROR ADDRESS
  2297 00003EA9 50                  <1> 	PUSH	eAX
  2298 00003EAA B44A                <1> 	MOV	AH,4AH			; READ ID COMMAND
  2299 00003EAC E820010000          <1> 	CALL	NEC_OUTPUT		; TO CONTROLLER
  2300 00003EB1 6689F8              <1> 	MOV	AX,DI			; DRIVE # TO AH, HEAD 0
  2301 00003EB4 88C4                <1> 	MOV	AH,AL
  2302 00003EB6 E816010000          <1> 	CALL	NEC_OUTPUT		; TO CONTROLLER
  2303 00003EBB E80BFEFFFF          <1> 	CALL	NEC_TERM		; WAIT FOR OPERATION, GET STATUS
  2304 00003EC0 58                  <1> 	POP	eAX			; THROW AWAY ERROR ADDRESS
  2305                              <1> ER_3:
  2306 00003EC1 C3                  <1> 	RETn
  2307                              <1> 
  2308                              <1> ;-------------------------------------------------------------------------------
  2309                              <1> ; CMOS_TYPE
  2310                              <1> ;	RETURNS DISKETTE TYPE FROM CMOS
  2311                              <1> ;
  2312                              <1> ; ON ENTRY:	DI = DRIVE #
  2313                              <1> ;
  2314                              <1> ; ON EXIT:	AL = TYPE; CY REFLECTS STATUS
  2315                              <1> ;-------------------------------------------------------------------------------
  2316                              <1> 
  2317                              <1> CMOS_TYPE: ; 11/12/2014
  2318 00003EC2 8A87[565D0000]      <1> mov	al, [eDI+fd0_type]
  2319 00003EC8 20C0                <1> and 	al, al ; 18/12/2014
  2320 00003ECA C3                  <1> retn
  2321                              <1> 
  2322                              <1> ;CMOS_TYPE:
  2323                              <1> ;	MOV	AL, CMOS_DIAG		; CMOS DIAGNOSTIC STATUS BYTE ADDRESS
  2324                              <1> ;	CALL	CMOS_READ		; GET CMOS STATUS
  2325                              <1> ;	TEST	AL,BAD_BAT+BAD_CKSUM	; BATTERY GOOD AND CHECKSUM VALID
  2326                              <1> ;	STC				; SET CY = 1 INDICATING ERROR FOR RETURN
  2327                              <1> ;	JNZ	short BAD_CM		; ERROR IF EITHER BIT ON
  2328                              <1> ;	MOV	AL,CMOS_DISKETTE	; ADDRESS OF DISKETTE BYTE IN CMOS
  2329                              <1> ;	CALL	CMOS_READ		; GET DISKETTE BYTE
  2330                              <1> ;	OR	DI,DI			; SEE WHICH DRIVE IN QUESTION
  2331                              <1> ;	JNZ	short TB		; IF DRIVE 1, DATA IN LOW NIBBLE
  2332                              <1> ;	ROR	AL,4			; EXCHANGE NIBBLES IF SECOND DRIVE
  2333                              <1> ;TB:
  2334                              <1> ;	AND	AL,0FH			; KEEP ONLY DRIVE DATA, RESET CY, 0
  2335                              <1> ;BAD_CM:
  2336                              <1> ;	RETn				; CY, STATUS OF READ
  2337                              <1> 
  2338                              <1> ;-------------------------------------------------------------------------------
  2339                              <1> ; GET_PARM
  2340                              <1> ;	THIS ROUTINE FETCHES THE INDEXED POINTER FROM THE DISK_BASE
  2341                              <1> ;	BLOCK POINTED TO BY THE DATA VARIABLE @DISK_POINTER. A BYTE FROM
  2342                              <1> ;	THAT TABLE IS THEN MOVED INTO AH, THE INDEX OF THAT BYTE BEING
  2343                              <1> ;	THE PARAMETER IN DL.
  2344                              <1> ;
  2345                              <1> ; ON ENTRY:	DL = INDEX OF BYTE TO BE FETCHED
  2346                              <1> ;
  2347                              <1> ; ON EXIT:	AH = THAT BYTE FROM BLOCK
  2348                              <1> ;		AL,DH DESTROYED
  2349                              <1> ;-------------------------------------------------------------------------------
  2350                              <1> GET_PARM:
  2351                              <1> 	;PUSH	DS
  2352 00003ECB 56                  <1> 	PUSH	eSI
  2353                              <1>     	;SUB	AX,AX			; DS = 0, BIOS DATA AREA
  2354                              <1>     	;MOV	DS,AX
  2355                              <1> 	;;mov	ax, cs
  2356                              <1> 	;;mov	ds, ax
  2357                              <1> 	; 08/02/2015 (protected mode modifications, bx -> ebx)
  2358 00003ECC 87D3                <1> 	XCHG	eDX,eBX			; BL = INDEX
  2359                              <1> 	;SUB	BH,BH			; BX = INDEX
  2360 00003ECE 81E3FF000000        <1> 	and	ebx, 0FFh
  2361                              <1>     	;LDS	SI, [DISK_POINTER]	; POINT TO BLOCK
  2362                              <1> 	;
  2363                              <1> 	; 17/12/2014
  2364 00003ED4 66A1[455D0000]      <1> 	mov	ax, [cfd] ; current (AL) and previous fd (AH)
  2365 00003EDA 38E0                <1> 	cmp	al, ah
  2366 00003EDC 7425                <1> 	je	short gpndc
  2367 00003EDE A2[465D0000]        <1> 	mov	[pfd], al ; current drive -> previous drive
  2368 00003EE3 53                  <1> 	push	ebx ; 08/02/2015
  2369 00003EE4 88C3                <1> 	mov	bl, al 
  2370                              <1> 	; 11/12/2014
  2371 00003EE6 8A83[565D0000]      <1> 	mov	al, [eBX+fd0_type]	; Drive type (0,1,2,3,4)
  2372                              <1> 	; 18/12/2014
  2373 00003EEC 20C0                <1> 	and	al, al
  2374 00003EEE 7507                <1> 	jnz	short gpdtc
  2375 00003EF0 BB[2F5D0000]        <1> 	mov	ebx, MD_TBL6		; 1.44 MB param. tbl. (default)
  2376 00003EF5 EB05                <1>         jmp     short gpdpu
  2377                              <1> gpdtc:	
  2378 00003EF7 E817F9FFFF          <1> 	call	DR_TYPE_CHECK
  2379                              <1> 	; cf = 1 -> eBX points to 1.44MB fd parameter table (default)
  2380                              <1> gpdpu:
  2381 00003EFC 891D[CC5C0000]      <1> 	mov	[DISK_POINTER], ebx
  2382 00003F02 5B                  <1> 	pop	ebx
  2383                              <1> gpndc:
  2384 00003F03 8B35[CC5C0000]      <1> 	mov	esi, [DISK_POINTER] ; 08/02/2015, si -> esi
  2385 00003F09 8A241E              <1> 	MOV	AH, [eSI+eBX]		; GET THE WORD
  2386 00003F0C 87D3                <1> 	XCHG	eDX,eBX			; RESTORE BX
  2387 00003F0E 5E                  <1> 	POP	eSI
  2388                              <1> 	;POP	DS
  2389 00003F0F C3                  <1> 	RETn
  2390                              <1> 
  2391                              <1> ;-------------------------------------------------------------------------------
  2392                              <1> ; MOTOR_ON
  2393                              <1> ;	TURN MOTOR ON AND WAIT FOR MOTOR START UP TIME. THE @MOTOR_COUNT
  2394                              <1> ;	IS REPLACED WITH A SUFFICIENTLY HIGH NUMBER (0FFH) TO ENSURE
  2395                              <1> ;	THAT THE MOTOR DOES NOT GO OFF DURING THE OPERATION. IF THE
  2396                              <1> ;	MOTOR NEEDED TO BE TURNED ON, THE MULTI-TASKING HOOK FUNCTION
  2397                              <1> ;	(AX=90FDH, INT 15) IS CALLED TELLING THE OPERATING SYSTEM
  2398                              <1> ;	THAT THE BIOS IS ABOUT TO WAIT FOR MOTOR START UP. IF THIS
  2399                              <1> ;	FUNCTION RETURNS WITH CY = 1, IT MEANS THAT THE MINIMUM WAIT
  2400                              <1> ;	HAS BEEN COMPLETED. AT THIS POINT A CHECK IS MADE TO ENSURE
  2401                              <1> ;	THAT THE MOTOR WASN'T TURNED OFF BY THE TIMER. IF THE HOOK DID
  2402                              <1> ;	NOT WAIT, THE WAIT FUNCTION (AH=086H) IS CALLED TO WAIT THE
  2403                              <1> ;	PRESCRIBED AMOUNT OF TIME. IF THE CARRY FLAG IS SET ON RETURN,
  2404                              <1> ;	IT MEANS THAT THE FUNCTION IS IN USE AND DID NOT PERFORM THE
  2405                              <1> ;	WAIT. A TIMER 1 WAIT LOOP WILL THEN DO THE WAIT.
  2406                              <1> ;
  2407                              <1> ; ON ENTRY:	DI = DRIVE #
  2408                              <1> ; ON EXIT:	AX,CX,DX DESTROYED
  2409                              <1> ;-------------------------------------------------------------------------------
  2410                              <1> MOTOR_ON:
  2411 00003F10 53                  <1> 	PUSH	eBX			; SAVE REG.
  2412 00003F11 E82A000000          <1> 	CALL	TURN_ON			; TURN ON MOTOR
  2413 00003F16 7226                <1> 	JC	short MOT_IS_ON		; IF CY=1 NO WAIT
  2414 00003F18 E89BF9FFFF          <1> 	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  2415 00003F1D E865F9FFFF          <1> 	CALL	XLAT_NEW		; TRANSLATE STATE TO PRESENT ARCH,
  2416                              <1> 	;CALL	TURN_ON 		; CHECK AGAIN IF MOTOR ON
  2417                              <1> 	;JC	MOT_IS_ON		; IF NO WAIT MEANS IT IS ON
  2418                              <1> M_WAIT:
  2419 00003F22 B20A                <1> 	MOV	DL,10			; GET THE MOTOR WAIT PARAMETER
  2420 00003F24 E8A2FFFFFF          <1> 	CALL	GET_PARM
  2421                              <1> 	;MOV	AL,AH			; AL = MOTOR WAIT PARAMETER
  2422                              <1> 	;XOR	AH,AH			; AX = MOTOR WAIT PARAMETER
  2423                              <1> 	;CMP	AL,8			; SEE IF AT LEAST A SECOND IS SPECIFIED
  2424 00003F29 80FC08              <1> 	cmp	ah, 8
  2425                              <1> 	;JAE	short GP2		; IF YES, CONTINUE
  2426 00003F2C 7702                <1> 	ja	short J13
  2427                              <1> 	;MOV	AL,8			; ONE SECOND WAIT FOR MOTOR START UP
  2428 00003F2E B408                <1> 	mov	ah, 8
  2429                              <1> 
  2430                              <1> ;-----	AS CONTAINS NUMBER OF 1/8 SECONDS (125000 MICROSECONDS) TO WAIT
  2431                              <1> GP2:	
  2432                              <1> ;----- 	FOLLOWING LOOPS REQUIRED WHEN RTC WAIT FUNCTION IS ALREADY IN USE
  2433                              <1> J13:					; WAIT FOR 1/8 SECOND PER (AL)
  2434 00003F30 B95E200000          <1> 	MOV	eCX,8286		; COUNT FOR 1/8 SECOND AT 15.085737 US
  2435 00003F35 E8BCDEFFFF          <1> 	CALL	WAITF			; GO TO FIXED WAIT ROUTINE
  2436                              <1> 	;DEC	AL			; DECREMENT TIME VALUE
  2437 00003F3A FECC                <1> 	dec	ah
  2438 00003F3C 75F2                <1> 	JNZ	short J13		; ARE WE DONE YET
  2439                              <1> MOT_IS_ON:
  2440 00003F3E 5B                  <1> 	POP	eBX			; RESTORE REG.
  2441 00003F3F C3                  <1> 	RETn
  2442                              <1> 
  2443                              <1> ;-------------------------------------------------------------------------------
  2444                              <1> ; TURN_ON
  2445                              <1> ;	TURN MOTOR ON AND RETURN WAIT STATE.
  2446                              <1> ;
  2447                              <1> ; ON ENTRY:	DI = DRIVE #
  2448                              <1> ;
  2449                              <1> ; ON EXIT:	CY = 0 MEANS WAIT REQUIRED
  2450                              <1> ;		CY = 1 MEANS NO WAIT REQUIRED
  2451                              <1> ;		AX,BX,CX,DX DESTROYED
  2452                              <1> ;-------------------------------------------------------------------------------
  2453                              <1> TURN_ON:
  2454 00003F40 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2455 00003F42 88D9                <1> 	MOV	CL,BL			; CL = DRIVE #
  2456 00003F44 C0C304              <1> 	ROL	BL,4			; BL = DRIVE SELECT
  2457 00003F47 FA                  <1> 	CLI				; NO INTERRUPTS WHILE DETERMINING STATUS
  2458 00003F48 C605[47590100]FF    <1> 	MOV	byte [MOTOR_COUNT],0FFH	; ENSURE MOTOR STAYS ON FOR OPERATION
  2459 00003F4F A0[46590100]        <1> 	MOV	AL, [MOTOR_STATUS]	; GET DIGITAL OUTPUT REGISTER REFLECTION
  2460 00003F54 2430                <1> 	AND	AL,00110000B		; KEEP ONLY DRIVE SELECT BITS
  2461 00003F56 B401                <1> 	MOV	AH,1			; MASK FOR DETERMINING MOTOR BIT
  2462 00003F58 D2E4                <1> 	SHL	AH,CL			; AH = MOTOR ON, A=00000001, B=00000010
  2463                              <1> 
  2464                              <1> ;  AL = DRIVE SELECT FROM @MOTOR_STATUS
  2465                              <1> ;  BL = DRIVE SELECT DESIRED
  2466                              <1> ;  AH = MOTOR ON MASK DESIRED
  2467                              <1> 
  2468 00003F5A 38D8                <1> 	CMP	AL,BL			; REQUESTED DRIVE ALREADY SELECTED ?
  2469 00003F5C 7508                <1> 	JNZ	short TURN_IT_ON	; IF NOT SELECTED JUMP
  2470 00003F5E 8425[46590100]      <1> 	TEST	AH, [MOTOR_STATUS]	; TEST MOTOR ON BIT
  2471 00003F64 7535                <1> 	JNZ	short NO_MOT_WAIT	; JUMP IF MOTOR ON AND SELECTED
  2472                              <1> 
  2473                              <1> TURN_IT_ON:
  2474 00003F66 08DC                <1> 	OR	AH,BL			; AH = DRIVE SELECT AND MOTOR ON
  2475 00003F68 8A3D[46590100]      <1> 	MOV	BH,[MOTOR_STATUS]	; SAVE COPY OF @MOTOR_STATUS BEFORE
  2476 00003F6E 80E70F              <1> 	AND	BH,00001111B		; KEEP ONLY MOTOR BITS
  2477 00003F71 8025[46590100]CF    <1> 	AND	byte [MOTOR_STATUS],11001111B ; CLEAR OUT DRIVE SELECT
  2478 00003F78 0825[46590100]      <1> 	OR	[MOTOR_STATUS],AH	; OR IN DRIVE SELECTED AND MOTOR ON
  2479 00003F7E A0[46590100]        <1> 	MOV	AL,[MOTOR_STATUS]	; GET DIGITAL OUTPUT REGISTER REFLECTION
  2480 00003F83 88C3                <1> 	MOV	BL,AL			; BL=@MOTOR_STATUS AFTER, BH=BEFORE
  2481 00003F85 80E30F              <1> 	AND	BL,00001111B		; KEEP ONLY MOTOR BITS
  2482 00003F88 FB                  <1> 	STI				; ENABLE INTERRUPTS AGAIN
  2483 00003F89 243F                <1> 	AND	AL,00111111B		; STRIP AWAY UNWANTED BITS
  2484 00003F8B C0C004              <1> 	ROL	AL,4			; PUT BITS IN DESIRED POSITIONS
  2485 00003F8E 0C0C                <1> 	OR	AL,00001100B		; NO RESET, ENABLE DMA/INTERRUPT
  2486 00003F90 66BAF203            <1> 	MOV	DX,03F2H		; SELECT DRIVE AND TURN ON MOTOR
  2487 00003F94 EE                  <1> 	OUT	DX,AL
  2488 00003F95 38FB                <1> 	CMP	BL,BH			; NEW MOTOR TURNED ON ?
  2489                              <1> 	;JZ	short NO_MOT_WAIT	; NO WAIT REQUIRED IF JUST SELECT
  2490 00003F97 7403                <1> 	je	short no_mot_w1 ; 27/02/2015 
  2491 00003F99 F8                  <1> 	CLC				; (re)SET CARRY MEANING WAIT
  2492 00003F9A C3                  <1> 	RETn
  2493                              <1> 
  2494                              <1> NO_MOT_WAIT:
  2495 00003F9B FB                  <1> 	sti
  2496                              <1> no_mot_w1: ; 27/02/2015
  2497 00003F9C F9                  <1> 	STC				; SET NO WAIT REQUIRED
  2498                              <1> 	;STI				; INTERRUPTS BACK ON
  2499 00003F9D C3                  <1> 	RETn
  2500                              <1> 
  2501                              <1> ;-------------------------------------------------------------------------------
  2502                              <1> ; HD_WAIT
  2503                              <1> ;	WAIT FOR HEAD SETTLE TIME.
  2504                              <1> ;
  2505                              <1> ; ON ENTRY:	DI = DRIVE #
  2506                              <1> ;
  2507                              <1> ; ON EXIT:	AX,BX,CX,DX DESTROYED
  2508                              <1> ;-------------------------------------------------------------------------------
  2509                              <1> HD_WAIT:
  2510 00003F9E B209                <1> 	MOV	DL,9			; GET HEAD SETTLE PARAMETER
  2511 00003FA0 E826FFFFFF          <1> 	CALL	GET_PARM
  2512 00003FA5 08E4                <1> 	or	ah, ah	; 17/12/2014
  2513 00003FA7 7519                <1> 	jnz	short DO_WAT
  2514 00003FA9 F605[46590100]80    <1>         TEST    byte [MOTOR_STATUS],10000000B ; SEE IF A WRITE OPERATION
  2515                              <1> 	;JZ	short ISNT_WRITE	; IF NOT, DO NOT ENFORCE ANY VALUES
  2516                              <1> 	;OR	AH,AH			; CHECK FOR ANY WAIT?
  2517                              <1> 	;JNZ	short DO_WAT		; IF THERE DO NOT ENFORCE
  2518 00003FB0 741E                <1> 	jz	short HW_DONE
  2519 00003FB2 B40F                <1> 	MOV	AH,HD12_SETTLE		; LOAD 1.2M HEAD SETTLE MINIMUM
  2520 00003FB4 8A87[55590100]      <1> 	MOV	AL,[DSK_STATE+eDI]	; LOAD STATE
  2521 00003FBA 24C0                <1> 	AND	AL,RATE_MSK		; KEEP ONLY RATE
  2522 00003FBC 3C80                <1> 	CMP	AL,RATE_250		; 1.2 M DRIVE ?
  2523 00003FBE 7502                <1> 	JNZ	short DO_WAT		; DEFAULT HEAD SETTLE LOADED
  2524                              <1> ;GP3:
  2525 00003FC0 B414                <1> 	MOV	AH,HD320_SETTLE		; USE 320/360 HEAD SETTLE
  2526                              <1> ;	JMP	SHORT DO_WAT
  2527                              <1> 
  2528                              <1> ;ISNT_WRITE:
  2529                              <1> ;	OR	AH,AH			; CHECK FOR NO WAIT
  2530                              <1> ;	JZ	short HW_DONE		; IF NOT WRITE AND 0 ITS OK
  2531                              <1> 
  2532                              <1> ;-----	AH CONTAINS NUMBER OF MILLISECONDS TO WAIT
  2533                              <1> DO_WAT:
  2534                              <1> ;	MOV	AL,AH			; AL = # MILLISECONDS
  2535                              <1> ;	;XOR	AH,AH			; AX = # MILLISECONDS
  2536                              <1> J29:					; 	1 MILLISECOND LOOP
  2537                              <1> 	;mov	cx, WAIT_FDU_HEAD_SETTLE ; 33 ; 1 ms in 30 micro units.
  2538 00003FC2 B942000000          <1> 	MOV	eCX,66			; COUNT AT 15.085737 US PER COUNT
  2539 00003FC7 E82ADEFFFF          <1> 	CALL	WAITF			; DELAY FOR 1 MILLISECOND
  2540                              <1> 	;DEC	AL			; DECREMENT THE COUNT
  2541 00003FCC FECC                <1> 	dec	ah
  2542 00003FCE 75F2                <1> 	JNZ	short J29		; DO AL MILLISECOND # OF TIMES
  2543                              <1> HW_DONE:
  2544 00003FD0 C3                  <1> 	RETn
  2545                              <1> 
  2546                              <1> ;-------------------------------------------------------------------------------
  2547                              <1> ; NEC_OUTPUT
  2548                              <1> ;	THIS ROUTINE SENDS A BYTE TO THE NEC CONTROLLER AFTER TESTING
  2549                              <1> ;	FOR CORRECT DIRECTION AND CONTROLLER READY THIS ROUTINE WILL
  2550                              <1> ;	TIME OUT IF THE BYTE IS NOT ACCEPTED WITHIN A REASONABLE AMOUNT
  2551                              <1> ;	OF TIME, SETTING THE DISKETTE STATUS ON COMPLETION.
  2552                              <1> ; 
  2553                              <1> ; ON ENTRY: 	AH = BYTE TO BE OUTPUT
  2554                              <1> ;
  2555                              <1> ; ON EXIT:	CY = 0  SUCCESS
  2556                              <1> ;		CY = 1  FAILURE -- DISKETTE STATUS UPDATED
  2557                              <1> ;		        IF A FAILURE HAS OCCURRED, THE RETURN IS MADE ONE LEVEL
  2558                              <1> ;		        HIGHER THAN THE CALLER OF NEC OUTPUT. THIS REMOVES THE
  2559                              <1> ;		        REQUIREMENT OF TESTING AFTER EVERY CALL OF NEC_OUTPUT.
  2560                              <1> ;		AX,CX,DX DESTROYED
  2561                              <1> ;-------------------------------------------------------------------------------
  2562                              <1> 
  2563                              <1> ; 09/12/2014 [Erdogan Tan] 
  2564                              <1> ;	(from 'PS2 Hardware Interface Tech. Ref. May 88', Page 09-05.)
  2565                              <1> ; Diskette Drive Controller Status Register (3F4h)
  2566                              <1> ;	This read only register facilitates the transfer of data between
  2567                              <1> ;	the system microprocessor and the controller.
  2568                              <1> ; Bit 7 - When set to 1, the Data register is ready to transfer data 
  2569                              <1> ;	  with the system micrprocessor.
  2570                              <1> ; Bit 6 - The direction of data transfer. If this bit is set to 0,
  2571                              <1> ;	  the transfer is to the controller.
  2572                              <1> ; Bit 5 - When this bit is set to 1, the controller is in the non-DMA mode.
  2573                              <1> ; Bit 4 - When this bit is set to 1, a Read or Write command is being executed.
  2574                              <1> ; Bit 3 - Reserved.
  2575                              <1> ; Bit 2 - Reserved.
  2576                              <1> ; Bit 1 - When this bit is set to 1, dskette drive 1 is in the seek mode.
  2577                              <1> ; Bit 0 - When this bit is set to 1, dskette drive 1 is in the seek mode.
  2578                              <1> 
  2579                              <1> ; Data Register (3F5h)
  2580                              <1> ; This read/write register passes data, commands and parameters, and provides
  2581                              <1> ; diskette status information.
  2582                              <1>   		
  2583                              <1> NEC_OUTPUT:
  2584                              <1> 	;PUSH	BX			; SAVE REG.
  2585 00003FD1 66BAF403            <1> 	MOV	DX,03F4H		; STATUS PORT
  2586                              <1> 	;MOV	BL,2			; HIGH ORDER COUNTER
  2587                              <1> 	;XOR	CX,CX			; COUNT FOR TIME OUT
  2588                              <1> 	; 16/12/2014
  2589                              <1> 	; waiting for (max.) 0.5 seconds
  2590                              <1>         ;;mov     byte [wait_count], 0 ;; 27/02/2015
  2591                              <1> 	;
  2592                              <1> 	; 17/12/2014
  2593                              <1> 	; Modified from AWARD BIOS 1999 - ADISK.ASM - SEND_COMMAND
  2594                              <1> 	;
  2595                              <1> 	;WAIT_FOR_PORT:	Waits for a bit at a port pointed to by DX to
  2596                              <1> 	;		go on.
  2597                              <1> 	;INPUT:
  2598                              <1> 	;	AH=Mask for isolation bits.
  2599                              <1> 	;	AL=pattern to look for.
  2600                              <1> 	;	DX=Port to test for
  2601                              <1> 	;	BH:CX=Number of memory refresh periods to delay.
  2602                              <1> 	;	     (normally 30 microseconds per period.)
  2603                              <1> 	;
  2604                              <1> 	;WFP_SHORT:  
  2605                              <1> 	;	Wait for port if refresh cycle is short (15-80 Us range).
  2606                              <1> 	;
  2607                              <1> 
  2608                              <1> ;	mov	bl, WAIT_FDU_SEND_HI+1	; 0+1
  2609                              <1> ;	mov	cx, WAIT_FDU_SEND_LO	; 16667
  2610 00003FD5 B91B410000          <1> 	mov	ecx, WAIT_FDU_SEND_LH   ; 16667 (27/02/2015)
  2611                              <1> ;
  2612                              <1> ;WFPS_OUTER_LP:
  2613                              <1> ;	;
  2614                              <1> ;WFPS_CHECK_PORT:
  2615                              <1> J23:
  2616 00003FDA EC                  <1> 	IN	AL,DX			; GET STATUS
  2617 00003FDB 24C0                <1> 	AND	AL,11000000B		; KEEP STATUS AND DIRECTION
  2618 00003FDD 3C80                <1> 	CMP	AL,10000000B		; STATUS 1 AND DIRECTION 0 ?
  2619 00003FDF 7418                <1> 	JZ	short J27		; STATUS AND DIRECTION OK
  2620                              <1> WFPS_HI:
  2621 00003FE1 E461                <1> 	IN	AL, PORT_B	;061h	; SYS1	; wait for hi to lo
  2622 00003FE3 A810                <1> 	TEST	AL,010H			; transition on memory
  2623 00003FE5 75FA                <1> 	JNZ	SHORT WFPS_HI		; refresh.
  2624                              <1> WFPS_LO:
  2625 00003FE7 E461                <1> 	IN	AL, PORT_B		; SYS1
  2626 00003FE9 A810                <1> 	TEST	AL,010H
  2627 00003FEB 74FA                <1> 	JZ	SHORT WFPS_LO
  2628                              <1> 	;LOOP	SHORT WFPS_CHECK_PORT
  2629 00003FED E2EB                <1> 	loop	J23	; 27/02/2015
  2630                              <1> ;	;
  2631                              <1> ;	dec	bl
  2632                              <1> ;	jnz	short WFPS_OUTER_LP
  2633                              <1> ;	jmp	short WFPS_TIMEOUT	; fail
  2634                              <1> ;J23:
  2635                              <1> ;	IN	AL,DX			; GET STATUS
  2636                              <1> ;	AND	AL,11000000B		; KEEP STATUS AND DIRECTION
  2637                              <1> ;	CMP	AL,10000000B		; STATUS 1 AND DIRECTION 0 ?
  2638                              <1> ;	JZ	short J27		; STATUS AND DIRECTION OK
  2639                              <1> 	;LOOP	J23			; CONTINUE TILL CX EXHAUSTED
  2640                              <1> 	;DEC	BL			; DECREMENT COUNTER
  2641                              <1> 	;JNZ	short J23		; REPEAT TILL DELAY FINISHED, CX = 0
  2642                              <1>    
  2643                              <1> 	;;27/02/2015
  2644                              <1> 	;16/12/2014
  2645                              <1>         ;;cmp     byte [wait_count], 10   ; (10/18.2 seconds)
  2646                              <1> 	;;jb	short J23
  2647                              <1> 
  2648                              <1> ;WFPS_TIMEOUT:
  2649                              <1> 
  2650                              <1> ;-----	FALL THRU TO ERROR RETURN
  2651                              <1> 
  2652 00003FEF 800D[48590100]80    <1> 	OR	byte [DSKETTE_STATUS],TIME_OUT
  2653                              <1> 	;POP	BX			; RESTORE REG.
  2654 00003FF6 58                  <1> 	POP	eAX ; 08/02/2015	; DISCARD THE RETURN ADDRESS
  2655 00003FF7 F9                  <1> 	STC				; INDICATE ERROR TO CALLER
  2656 00003FF8 C3                  <1> 	RETn
  2657                              <1> 
  2658                              <1> ;-----	DIRECTION AND STATUS OK; OUTPUT BYTE
  2659                              <1> 
  2660                              <1> J27:	
  2661 00003FF9 88E0                <1> 	MOV	AL,AH			; GET BYTE TO OUTPUT
  2662 00003FFB 6642                <1> 	INC	DX			; DATA PORT = STATUS PORT + 1
  2663 00003FFD EE                  <1> 	OUT	DX,AL			; OUTPUT THE BYTE
  2664                              <1> 	;;NEWIODELAY  ;; 27/02/2015
  2665                              <1> 	; 27/02/2015
  2666 00003FFE 9C                  <1> 	PUSHF				; SAVE FLAGS
  2667 00003FFF B903000000          <1> 	MOV	eCX, 3			; 30 TO 45 MICROSECONDS WAIT FOR
  2668 00004004 E8EDDDFFFF          <1> 	CALL 	WAITF			; NEC FLAGS UPDATE CYCLE
  2669 00004009 9D                  <1> 	POPF				; RESTORE FLAGS FOR EXIT
  2670                              <1> 	;POP	BX			; RESTORE REG
  2671 0000400A C3                  <1> 	RETn				; CY = 0 FROM TEST INSTRUCTION
  2672                              <1> 
  2673                              <1> ;-------------------------------------------------------------------------------
  2674                              <1> ; SEEK
  2675                              <1> ;	THIS ROUTINE WILL MOVE THE HEAD ON THE NAMED DRIVE TO THE NAMED
  2676                              <1> ;	TRACK. IF THE DRIVE HAS NOT BEEN ACCESSED SINCE THE DRIVE
  2677                              <1> ;	RESET COMMAND WAS ISSUED, THE DRIVE WILL BE RECALIBRATED.
  2678                              <1> ;
  2679                              <1> ; ON ENTRY:	DI = DRIVE #
  2680                              <1> ;		CH = TRACK #
  2681                              <1> ;
  2682                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION.
  2683                              <1> ;		AX,BX,CX DX DESTROYED
  2684                              <1> ;-------------------------------------------------------------------------------
  2685                              <1> SEEK:
  2686 0000400B 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2687 0000400D B001                <1> 	MOV	AL,1			; ESTABLISH MASK FOR RECALIBRATE TEST
  2688 0000400F 86CB                <1> 	XCHG	CL,BL			; SET DRIVE VALULE INTO CL
  2689 00004011 D2C0                <1> 	ROL	AL,CL			; SHIFT MASK BY THE DRIVE VALUE
  2690 00004013 86CB                <1> 	XCHG	CL,BL			; RECOVER TRACK VALUE
  2691 00004015 8405[45590100]      <1> 	TEST	AL,[SEEK_STATUS]	; TEST FOR RECALIBRATE REQUIRED
  2692 0000401B 7526                <1> 	JNZ	short J28A		; JUMP IF RECALIBRATE NOT REQUIRED
  2693                              <1> 
  2694 0000401D 0805[45590100]      <1> 	OR	[SEEK_STATUS],AL	; TURN ON THE NO RECALIBRATE BIT IN FLAG
  2695 00004023 E862000000          <1> 	CALL	RECAL			; RECALIBRATE DRIVE
  2696 00004028 730E                <1> 	JNC	short AFT_RECAL		; RECALIBRATE DONE
  2697                              <1> 
  2698                              <1> ;-----	ISSUE RECALIBRATE FOR 80 TRACK DISKETTES
  2699                              <1> 
  2700 0000402A C605[48590100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; CLEAR OUT INVALID STATUS
  2701 00004031 E854000000          <1> 	CALL	RECAL			; RECALIBRATE DRIVE
  2702 00004036 7251                <1> 	JC	short RB		; IF RECALIBRATE FAILS TWICE THEN ERROR
  2703                              <1> 
  2704                              <1> AFT_RECAL:
  2705 00004038 C687[59590100]00    <1>         MOV     byte [DSK_TRK+eDI],0    ; SAVE NEW CYLINDER AS PRESENT POSITION
  2706 0000403F 08ED                <1> 	OR	CH,CH			; CHECK FOR SEEK TO TRACK 0
  2707 00004041 743F                <1> 	JZ	short DO_WAIT		; HEAD SETTLE, CY = 0 IF JUMP
  2708                              <1> 
  2709                              <1> ;-----	DRIVE IS IN SYNCHRONIZATION WITH CONTROLLER, SEEK TO TRACK
  2710                              <1> 
  2711 00004043 F687[55590100]20    <1> J28A:	TEST	byte [DSK_STATE+eDI],DBL_STEP ; CHECK FOR DOUBLE STEP REQUIRED
  2712 0000404A 7402                <1> 	JZ	short _R7		; SINGLE STEP REQUIRED BYPASS DOUBLE
  2713 0000404C D0E5                <1> 	SHL	CH,1			; DOUBLE NUMBER OF STEP TO TAKE
  2714                              <1> 
  2715 0000404E 3AAF[59590100]      <1> _R7:	CMP	CH, [DSK_TRK+eDI]	; SEE IF ALREADY AT THE DESIRED TRACK
  2716 00004054 7433                <1> 	JE	short RB		; IF YES, DO NOT NEED TO SEEK
  2717                              <1> 
  2718 00004056 BA[89400000]        <1> 	MOV	eDX, NEC_ERR		; LOAD RETURN ADDRESS
  2719 0000405B 52                  <1> 	PUSH	eDX ; (*)		; ON STACK FOR NEC OUTPUT ERROR
  2720 0000405C 88AF[59590100]      <1> 	MOV	[DSK_TRK+eDI],CH	; SAVE NEW CYLINDER AS PRESENT POSITION
  2721 00004062 B40F                <1> 	MOV	AH,0FH			; SEEK COMMAND TO NEC
  2722 00004064 E868FFFFFF          <1> 	CALL	NEC_OUTPUT
  2723 00004069 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2724 0000406B 88DC                <1> 	MOV	AH,BL			; OUTPUT DRIVE NUMBER
  2725 0000406D E85FFFFFFF          <1> 	CALL	NEC_OUTPUT
  2726 00004072 8AA7[59590100]      <1> 	MOV	AH, [DSK_TRK+eDI]	; GET CYLINDER NUMBER
  2727 00004078 E854FFFFFF          <1> 	CALL	NEC_OUTPUT
  2728 0000407D E829000000          <1> 	CALL	CHK_STAT_2		; ENDING INTERRUPT AND SENSE STATUS
  2729                              <1> 
  2730                              <1> ;-----	WAIT FOR HEAD SETTLE
  2731                              <1> 
  2732                              <1> DO_WAIT:
  2733 00004082 9C                  <1> 	PUSHF				; SAVE STATUS
  2734 00004083 E816FFFFFF          <1> 	CALL	HD_WAIT			; WAIT FOR HEAD SETTLE TIME
  2735 00004088 9D                  <1> 	POPF				; RESTORE STATUS
  2736                              <1> RB:
  2737                              <1> NEC_ERR:
  2738                              <1> 	; 08/02/2015 (code trick here from original IBM PC/AT DISKETTE.ASM)
  2739                              <1> 	; (*) nec_err -> retn (push edx -> pop edx) -> nec_err -> retn
  2740 00004089 C3                  <1> 	RETn				; RETURN TO CALLER
  2741                              <1> 
  2742                              <1> ;-------------------------------------------------------------------------------
  2743                              <1> ; RECAL
  2744                              <1> ;	RECALIBRATE DRIVE
  2745                              <1> ;
  2746                              <1> ; ON ENTRY:	DI = DRIVE #
  2747                              <1> ;
  2748                              <1> ; ON EXIT:	CY REFLECTS STATUS OF OPERATION.
  2749                              <1> ;-------------------------------------------------------------------------------
  2750                              <1> RECAL:
  2751 0000408A 6651                <1> 	PUSH	CX
  2752 0000408C B8[A8400000]        <1> 	MOV	eAX, RC_BACK		; LOAD NEC_OUTPUT ERROR
  2753 00004091 50                  <1> 	PUSH	eAX
  2754 00004092 B407                <1> 	MOV	AH,07H			; RECALIBRATE COMMAND
  2755 00004094 E838FFFFFF          <1> 	CALL	NEC_OUTPUT
  2756 00004099 89FB                <1> 	MOV	eBX,eDI			; BX = DRIVE #
  2757 0000409B 88DC                <1> 	MOV	AH,BL
  2758 0000409D E82FFFFFFF          <1> 	CALL	NEC_OUTPUT		; OUTPUT THE DRIVE NUMBER
  2759 000040A2 E804000000          <1> 	CALL	CHK_STAT_2		; GET THE INTERRUPT AND SENSE INT STATUS
  2760 000040A7 58                  <1> 	POP	eAX			; THROW AWAY ERROR
  2761                              <1> RC_BACK:
  2762 000040A8 6659                <1> 	POP	CX
  2763 000040AA C3                  <1> 	RETn
  2764                              <1> 
  2765                              <1> ;-------------------------------------------------------------------------------
  2766                              <1> ; CHK_STAT_2
  2767                              <1> ;	THIS ROUTINE HANDLES THE INTERRUPT RECEIVED AFTER RECALIBRATE,
  2768                              <1> ;	OR SEEK TO THE ADAPTER. THE INTERRUPT IS WAITED FOR, THE
  2769                              <1> ;	INTERRUPT STATUS SENSED, AND THE RESULT RETURNED TO THE CALLER.
  2770                              <1> ;
  2771                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION.
  2772                              <1> ;-------------------------------------------------------------------------------
  2773                              <1> CHK_STAT_2:
  2774 000040AB B8[D3400000]        <1>         MOV     eAX, CS_BACK            ; LOAD NEC_OUTPUT ERROR ADDRESS
  2775 000040B0 50                  <1> 	PUSH	eAX
  2776 000040B1 E828000000          <1> 	CALL	WAIT_INT		; WAIT FOR THE INTERRUPT
  2777 000040B6 721A                <1> 	JC	short J34		; IF ERROR, RETURN IT
  2778 000040B8 B408                <1> 	MOV	AH,08H			; SENSE INTERRUPT STATUS COMMAND
  2779 000040BA E812FFFFFF          <1> 	CALL	NEC_OUTPUT
  2780 000040BF E84A000000          <1> 	CALL	RESULTS			; READ IN THE RESULTS
  2781 000040C4 720C                <1> 	JC	short J34
  2782 000040C6 A0[49590100]        <1> 	MOV	AL,[NEC_STATUS]		; GET THE FIRST STATUS BYTE
  2783 000040CB 2460                <1> 	AND	AL,01100000B		; ISOLATE THE BITS
  2784 000040CD 3C60                <1> 	CMP	AL,01100000B		; TEST FOR CORRECT VALUE
  2785 000040CF 7403                <1> 	JZ	short J35		; IF ERROR, GO MARK IT
  2786 000040D1 F8                  <1> 	CLC				; GOOD RETURN
  2787                              <1> J34:
  2788 000040D2 58                  <1> 	POP	eAX			; THROW AWAY ERROR RETURN
  2789                              <1> CS_BACK:
  2790 000040D3 C3                  <1> 	RETn
  2791                              <1> J35:
  2792 000040D4 800D[48590100]40    <1> 	OR	byte [DSKETTE_STATUS], BAD_SEEK
  2793 000040DB F9                  <1> 	STC				; ERROR RETURN CODE
  2794 000040DC EBF4                <1> 	JMP	SHORT J34
  2795                              <1> 
  2796                              <1> ;-------------------------------------------------------------------------------
  2797                              <1> ; WAIT_INT
  2798                              <1> ;	THIS ROUTINE WAITS FOR AN INTERRUPT TO OCCUR A TIME OUT ROUTINE
  2799                              <1> ;	TAKES PLACE DURING THE WAIT, SO THAT AN ERROR MAY BE RETURNED
  2800                              <1> ;	IF THE DRIVE IS NOT READY.
  2801                              <1> ;
  2802                              <1> ; ON EXIT: 	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION.
  2803                              <1> ;-------------------------------------------------------------------------------
  2804                              <1> 
  2805                              <1> ; 17/12/2014
  2806                              <1> ; 2.5 seconds waiting !
  2807                              <1> ;(AWARD BIOS - 1999, WAIT_FDU_INT_LOW, WAIT_FDU_INT_HI)
  2808                              <1> ; amount of time to wait for completion interrupt from NEC.
  2809                              <1> 
  2810                              <1> 
  2811                              <1> WAIT_INT:
  2812 000040DE FB                  <1> 	STI				; TURN ON INTERRUPTS, JUST IN CASE
  2813 000040DF F8                  <1> 	CLC				; CLEAR TIMEOUT INDICATOR
  2814                              <1>        ;MOV	BL,10			; CLEAR THE COUNTERS
  2815                              <1>        ;XOR	CX,CX			; FOR 2 SECOND WAIT
  2816                              <1> 
  2817                              <1> 	; Modification from AWARD BIOS - 1999 (ATORGS.ASM, WAIT
  2818                              <1> 	;
  2819                              <1> 	;WAIT_FOR_MEM:	
  2820                              <1> 	;	Waits for a bit at a specified memory location pointed
  2821                              <1> 	;	to by ES:[DI] to become set.
  2822                              <1> 	;INPUT:
  2823                              <1> 	;	AH=Mask to test with.
  2824                              <1> 	;	ES:[DI] = memory location to watch.
  2825                              <1> 	;	BH:CX=Number of memory refresh periods to delay.
  2826                              <1> 	;	     (normally 30 microseconds per period.)
  2827                              <1> 
  2828                              <1> 	; waiting for (max.) 2.5 secs in 30 micro units.
  2829                              <1> ;	mov 	cx, WAIT_FDU_INT_LO		; 017798
  2830                              <1> ;;	mov 	bl, WAIT_FDU_INT_HI
  2831                              <1> ;	mov 	bl, WAIT_FDU_INT_HI + 1
  2832                              <1> 	; 27/02/2015
  2833 000040E0 B986450100          <1> 	mov 	ecx, WAIT_FDU_INT_LH	; 83334 (2.5 seconds)		
  2834                              <1> WFMS_CHECK_MEM:
  2835 000040E5 F605[45590100]80    <1> 	test	byte [SEEK_STATUS],INT_FLAG ; TEST FOR INTERRUPT OCCURRING
  2836 000040EC 7516                <1>         jnz     short J37
  2837                              <1> WFMS_HI:
  2838 000040EE E461                <1> 	IN	AL,PORT_B  ; 061h	; SYS1, wait for lo to hi
  2839 000040F0 A810                <1> 	TEST	AL,010H			; transition on memory
  2840 000040F2 75FA                <1> 	JNZ	SHORT WFMS_HI		; refresh.
  2841                              <1> WFMS_LO:
  2842 000040F4 E461                <1> 	IN	AL,PORT_B		;SYS1
  2843 000040F6 A810                <1> 	TEST	AL,010H
  2844 000040F8 74FA                <1> 	JZ	SHORT WFMS_LO
  2845 000040FA E2E9                <1>         LOOP    WFMS_CHECK_MEM
  2846                              <1> ;WFMS_OUTER_LP:
  2847                              <1> ;;	or	bl, bl			; check outer counter
  2848                              <1> ;;	jz	short J36A		; WFMS_TIMEOUT
  2849                              <1> ;	dec	bl
  2850                              <1> ;	jz	short J36A	
  2851                              <1> ;	jmp	short WFMS_CHECK_MEM
  2852                              <1> 
  2853                              <1> 	;17/12/2014
  2854                              <1> 	;16/12/2014
  2855                              <1> ;        mov     byte [wait_count], 0    ; Reset (INT 08H) counter
  2856                              <1> ;J36:
  2857                              <1> ;	TEST	byte [SEEK_STATUS],INT_FLAG ; TEST FOR INTERRUPT OCCURRING
  2858                              <1> ;	JNZ	short J37
  2859                              <1> 	;16/12/2014
  2860                              <1> 	;LOOP	J36			; COUNT DOWN WHILE WAITING
  2861                              <1> 	;DEC	BL			; SECOND LEVEL COUNTER
  2862                              <1> 	;JNZ	short J36
  2863                              <1> ;       cmp     byte [wait_count], 46   ; (46/18.2 seconds)
  2864                              <1> ;	jb	short J36
  2865                              <1> 
  2866                              <1> ;WFMS_TIMEOUT:
  2867                              <1> ;J36A:
  2868 000040FC 800D[48590100]80    <1> 	OR	byte [DSKETTE_STATUS], TIME_OUT ; NOTHING HAPPENED
  2869 00004103 F9                  <1> 	STC				; ERROR RETURN
  2870                              <1> J37:
  2871 00004104 9C                  <1> 	PUSHF				; SAVE CURRENT CARRY
  2872 00004105 8025[45590100]7F    <1> 	AND	byte [SEEK_STATUS], ~INT_FLAG ; TURN OFF INTERRUPT FLAG
  2873 0000410C 9D                  <1> 	POPF				; RECOVER CARRY
  2874 0000410D C3                  <1> 	RETn				; GOOD RETURN CODE
  2875                              <1> 
  2876                              <1> ;-------------------------------------------------------------------------------
  2877                              <1> ; RESULTS
  2878                              <1> ;	THIS ROUTINE WILL READ ANYTHING THAT THE NEC CONTROLLER RETURNS 
  2879                              <1> ;	FOLLOWING AN INTERRUPT.
  2880                              <1> ;
  2881                              <1> ; ON EXIT:	@DSKETTE_STATUS, CY REFLECT STATUS OF OPERATION.
  2882                              <1> ;		AX,BX,CX,DX DESTROYED
  2883                              <1> ;-------------------------------------------------------------------------------
  2884                              <1> RESULTS:
  2885 0000410E 57                  <1> 	PUSH	eDI
  2886 0000410F BF[49590100]        <1> 	MOV	eDI, NEC_STATUS		; POINTER TO DATA AREA
  2887 00004114 B307                <1> 	MOV	BL,7			; MAX STATUS BYTES
  2888 00004116 66BAF403            <1> 	MOV	DX,03F4H		; STATUS PORT
  2889                              <1> 
  2890                              <1> ;-----	WAIT FOR REQUEST FOR MASTER
  2891                              <1> 
  2892                              <1> _R10: 
  2893                              <1> 	; 16/12/2014
  2894                              <1> 	; wait for (max) 0.5 seconds
  2895                              <1> 	;MOV	BH,2			; HIGH ORDER COUNTER
  2896                              <1> 	;XOR	CX,CX			; COUNTER
  2897                              <1> 
  2898                              <1> 	;Time to wait while waiting for each byte of NEC results = .5
  2899                              <1> 	;seconds.  .5 seconds = 500,000 micros.  500,000/30 = 16,667.
  2900                              <1> 	; 27/02/2015
  2901 0000411A B91B410000          <1> 	mov 	ecx, WAIT_FDU_RESULTS_LH ; 16667  
  2902                              <1> 	;mov	cx, WAIT_FDU_RESULTS_LO  ; 16667
  2903                              <1> 	;mov	bh, WAIT_FDU_RESULTS_HI+1 ; 0+1
  2904                              <1> 
  2905                              <1> WFPSR_OUTER_LP:
  2906                              <1> 	;
  2907                              <1> WFPSR_CHECK_PORT:
  2908                              <1> J39:					; WAIT FOR MASTER
  2909 0000411F EC                  <1> 	IN	AL,DX			; GET STATUS
  2910 00004120 24C0                <1> 	AND	AL,11000000B		; KEEP ONLY STATUS AND DIRECTION
  2911 00004122 3CC0                <1> 	CMP	AL,11000000B		; STATUS 1 AND DIRECTION 1 ?
  2912 00004124 7418                <1> 	JZ	short J42		; STATUS AND DIRECTION OK
  2913                              <1> WFPSR_HI:
  2914 00004126 E461                <1> 	IN	AL, PORT_B	;061h	; SYS1	; wait for hi to lo
  2915 00004128 A810                <1> 	TEST	AL,010H			; transition on memory
  2916 0000412A 75FA                <1> 	JNZ	SHORT WFPSR_HI		; refresh.
  2917                              <1> WFPSR_LO:
  2918 0000412C E461                <1> 	IN	AL, PORT_B		; SYS1
  2919 0000412E A810                <1> 	TEST	AL,010H
  2920 00004130 74FA                <1> 	JZ	SHORT WFPSR_LO
  2921 00004132 E2EB                <1>         LOOP    WFPSR_CHECK_PORT
  2922                              <1> 	;; 27/02/2015
  2923                              <1> 	;;dec	bh
  2924                              <1> 	;;jnz	short WFPSR_OUTER_LP
  2925                              <1> 	;jmp	short WFPSR_TIMEOUT	; fail
  2926                              <1> 
  2927                              <1> 	;;mov	byte [wait_count], 0
  2928                              <1> ;J39:					; WAIT FOR MASTER
  2929                              <1> ;	IN	AL,DX			; GET STATUS
  2930                              <1> ;	AND	AL,11000000B		; KEEP ONLY STATUS AND DIRECTION
  2931                              <1> ;	CMP	AL,11000000B		; STATUS 1 AND DIRECTION 1 ?
  2932                              <1> ;	JZ	short J42		; STATUS AND DIRECTION OK
  2933                              <1> 	;LOOP	J39			; LOOP TILL TIMEOUT
  2934                              <1> 	;DEC	BH			; DECREMENT HIGH ORDER COUNTER
  2935                              <1> 	;JNZ	short J39		; REPEAT TILL DELAY DONE
  2936                              <1> 	;
  2937                              <1> 	;;cmp	byte [wait_count], 10  ; (10/18.2 seconds)
  2938                              <1> 	;;jb	short J39	
  2939                              <1> 
  2940                              <1> ;WFPSR_TIMEOUT:
  2941 00004134 800D[48590100]80    <1> 	OR	byte [DSKETTE_STATUS],TIME_OUT
  2942 0000413B F9                  <1> 	STC				; SET ERROR RETURN
  2943 0000413C EB29                <1> 	JMP	SHORT POPRES		; POP REGISTERS AND RETURN
  2944                              <1> 
  2945                              <1> ;-----	READ IN THE STATUS
  2946                              <1> 
  2947                              <1> J42:
  2948 0000413E EB00                <1> 	JMP	$+2			; I/O DELAY
  2949 00004140 6642                <1> 	INC	DX			; POINT AT DATA PORT
  2950 00004142 EC                  <1> 	IN	AL,DX			; GET THE DATA
  2951                              <1> 	; 16/12/2014
  2952                              <1> 	NEWIODELAY
  2952 00004143 E6EB                <2>  out 0ebh,al
  2953 00004145 8807                <1>         MOV     [eDI],AL                ; STORE THE BYTE
  2954 00004147 47                  <1> 	INC	eDI			; INCREMENT THE POINTER
  2955                              <1> 	; 16/12/2014
  2956                              <1> ;	push	cx
  2957                              <1> ;	mov	cx, 30
  2958                              <1> ;wdw2:
  2959                              <1> ;	NEWIODELAY
  2960                              <1> ;	loop	wdw2
  2961                              <1> ;	pop	cx
  2962                              <1> 
  2963 00004148 B903000000          <1> 	MOV	eCX,3			; MINIMUM 24 MICROSECONDS FOR NEC
  2964 0000414D E8A4DCFFFF          <1> 	CALL	WAITF			; WAIT 30 TO 45 MICROSECONDS
  2965 00004152 664A                <1> 	DEC	DX			; POINT AT STATUS PORT
  2966 00004154 EC                  <1> 	IN	AL,DX			; GET STATUS
  2967                              <1> 	; 16/12/2014
  2968                              <1> 	NEWIODELAY
  2968 00004155 E6EB                <2>  out 0ebh,al
  2969                              <1> 	;
  2970 00004157 A810                <1> 	TEST	AL,00010000B		; TEST FOR NEC STILL BUSY
  2971 00004159 740C                <1> 	JZ	short POPRES		; RESULTS DONE ?
  2972                              <1> 
  2973 0000415B FECB                <1> 	DEC	BL			; DECREMENT THE STATUS COUNTER
  2974 0000415D 75BB                <1>         JNZ     short _R10              ; GO BACK FOR MORE
  2975 0000415F 800D[48590100]20    <1> 	OR	byte [DSKETTE_STATUS],BAD_NEC ; TOO MANY STATUS BYTES
  2976 00004166 F9                  <1> 	STC				; SET ERROR FLAG
  2977                              <1> 
  2978                              <1> ;-----	RESULT OPERATION IS DONE
  2979                              <1> POPRES:
  2980 00004167 5F                  <1> 	POP	eDI
  2981 00004168 C3                  <1> 	RETn				; RETURN WITH CARRY SET
  2982                              <1> 
  2983                              <1> ;-------------------------------------------------------------------------------
  2984                              <1> ; READ_DSKCHNG
  2985                              <1> ;	READS THE STATE OF THE DISK CHANGE LINE.
  2986                              <1> ;
  2987                              <1> ; ON ENTRY:	DI = DRIVE #
  2988                              <1> ;
  2989                              <1> ; ON EXIT:	DI = DRIVE #
  2990                              <1> ;		ZF = 0 : DISK CHANGE LINE INACTIVE
  2991                              <1> ;		ZF = 1 : DISK CHANGE LINE ACTIVE
  2992                              <1> ;		AX,CX,DX DESTROYED
  2993                              <1> ;-------------------------------------------------------------------------------
  2994                              <1> READ_DSKCHNG:
  2995 00004169 E8A2FDFFFF          <1> 	CALL	MOTOR_ON		; TURN ON THE MOTOR IF OFF
  2996 0000416E 66BAF703            <1> 	MOV	DX,03F7H		; ADDRESS DIGITAL INPUT REGISTER
  2997 00004172 EC                  <1> 	IN	AL,DX			; INPUT DIGITAL INPUT REGISTER
  2998 00004173 A880                <1> 	TEST	AL,DSK_CHG		; CHECK FOR DISK CHANGE LINE ACTIVE
  2999 00004175 C3                  <1> 	RETn				; RETURN TO CALLER WITH ZERO FLAG SET
  3000                              <1> 
  3001                              <1> ;-------------------------------------------------------------------------------
  3002                              <1> ; DRIVE_DET
  3003                              <1> ;	DETERMINES WHETHER DRIVE IS 80 OR 40 TRACKS AND
  3004                              <1> ;	UPDATES STATE INFORMATION ACCORDINGLY.
  3005                              <1> ; ON ENTRY:	DI = DRIVE #
  3006                              <1> ;-------------------------------------------------------------------------------
  3007                              <1> DRIVE_DET:
  3008 00004176 E895FDFFFF          <1> 	CALL	MOTOR_ON		; TURN ON MOTOR IF NOT ALREADY ON
  3009 0000417B E80AFFFFFF          <1> 	CALL	RECAL			; RECALIBRATE DRIVE
  3010 00004180 7251                <1> 	JC	short DD_BAC		; ASSUME NO DRIVE PRESENT
  3011 00004182 B530                <1> 	MOV	CH,TRK_SLAP		; SEEK TO TRACK 48
  3012 00004184 E882FEFFFF          <1> 	CALL	SEEK
  3013 00004189 7248                <1> 	JC	short DD_BAC		; ERROR NO DRIVE
  3014 0000418B B50B                <1> 	MOV	CH,QUIET_SEEK+1		; SEEK TO TRACK 10
  3015                              <1> SK_GIN:
  3016 0000418D FECD                <1> 	DEC	CH			; DECREMENT TO NEXT TRACK
  3017 0000418F 6651                <1> 	PUSH	CX			; SAVE TRACK
  3018 00004191 E875FEFFFF          <1> 	CALL	SEEK
  3019 00004196 723C                <1> 	JC	short POP_BAC		; POP AND RETURN
  3020 00004198 B8[D4410000]        <1> 	MOV	eAX, POP_BAC		; LOAD NEC OUTPUT ERROR ADDRESS
  3021 0000419D 50                  <1> 	PUSH	eAX
  3022 0000419E B404                <1> 	MOV	AH,SENSE_DRV_ST		; SENSE DRIVE STATUS COMMAND BYTE
  3023 000041A0 E82CFEFFFF          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO NEC
  3024 000041A5 6689F8              <1> 	MOV	AX,DI			; AL = DRIVE
  3025 000041A8 88C4                <1> 	MOV	AH,AL			; AH = DRIVE
  3026 000041AA E822FEFFFF          <1> 	CALL	NEC_OUTPUT		; OUTPUT TO NEC
  3027 000041AF E85AFFFFFF          <1> 	CALL	RESULTS			; GO GET STATUS
  3028 000041B4 58                  <1> 	POP	eAX			; THROW AWAY ERROR ADDRESS
  3029 000041B5 6659                <1> 	POP	CX			; RESTORE TRACK
  3030 000041B7 F605[49590100]10    <1> 	TEST	byte [NEC_STATUS], HOME	; TRACK 0 ?
  3031 000041BE 74CD                <1> 	JZ	short SK_GIN		; GO TILL TRACK 0
  3032 000041C0 08ED                <1> 	OR	CH,CH			; IS HOME AT TRACK 0
  3033 000041C2 7408                <1> 	JZ	short IS_80		; MUST BE 80 TRACK DRIVE
  3034                              <1> 
  3035                              <1> ;	DRIVE IS A 360; SET DRIVE TO DETERMINED;
  3036                              <1> ;	SET MEDIA TO DETERMINED AT RATE 250.
  3037                              <1> 
  3038 000041C4 808F[55590100]94    <1> 	OR	byte [DSK_STATE+eDI], DRV_DET+MED_DET+RATE_250
  3039 000041CB C3                  <1> 	RETn				; ALL INFORMATION SET
  3040                              <1> IS_80:
  3041 000041CC 808F[55590100]01    <1> 	OR	byte [DSK_STATE+eDI], TRK_CAPA ; SETUP 80 TRACK CAPABILITY
  3042                              <1> DD_BAC:
  3043 000041D3 C3                  <1> 	RETn
  3044                              <1> POP_BAC:
  3045 000041D4 6659                <1> 	POP	CX			; THROW AWAY
  3046 000041D6 C3                  <1> 	RETn
  3047                              <1> 
  3048                              <1> fdc_int:  
  3049                              <1> 	  ; 30/07/2015	
  3050                              <1> 	  ; 16/02/2015
  3051                              <1> ;int_0Eh: ; 11/12/2014
  3052                              <1> 
  3053                              <1> ;--- HARDWARE INT 0EH -- ( IRQ LEVEL  6 ) --------------------------------------
  3054                              <1> ; DISK_INT
  3055                              <1> ;	THIS ROUTINE HANDLES THE DISKETTE INTERRUPT.
  3056                              <1> ;
  3057                              <1> ; ON EXIT:	THE INTERRUPT FLAG IS SET IN @SEEK_STATUS.
  3058                              <1> ;-------------------------------------------------------------------------------
  3059                              <1> DISK_INT_1:
  3060                              <1> 
  3061 000041D7 6650                <1> 	PUSH	AX			; SAVE WORK REGISTER
  3062 000041D9 1E                  <1> 	push	ds
  3063 000041DA 66B81000            <1> 	mov	ax, KDATA
  3064 000041DE 8ED8                <1> 	mov 	ds, ax
  3065 000041E0 800D[45590100]80    <1>         OR      byte [SEEK_STATUS], INT_FLAG ; TURN ON INTERRUPT OCCURRED
  3066 000041E7 B020                <1> 	MOV     AL,EOI                  ; END OF INTERRUPT MARKER
  3067 000041E9 E620                <1> 	OUT	INTA00,AL		; INTERRUPT CONTROL PORT
  3068 000041EB 1F                  <1> 	pop	ds
  3069 000041EC 6658                <1> 	POP	AX			; RECOVER REGISTER
  3070 000041EE CF                  <1> 	IRETd				; RETURN FROM INTERRUPT
  3071                              <1> 
  3072                              <1> ;-------------------------------------------------------------------------------
  3073                              <1> ; DSKETTE_SETUP
  3074                              <1> ;	THIS ROUTINE DOES A PRELIMINARY CHECK TO SEE WHAT TYPE OF
  3075                              <1> ;	DISKETTE DRIVES ARE ATTACH TO THE SYSTEM.
  3076                              <1> ;-------------------------------------------------------------------------------
  3077                              <1> 
  3078                              <1> ; 29/05/2016 - TRDOS 386 (TRDOS v2.0)
  3079                              <1> 
  3080                              <1> DSKETTE_SETUP:
  3081                              <1> 	;PUSH	AX			; SAVE REGISTERS
  3082                              <1> 	;PUSH	BX
  3083                              <1> 	;PUSH	CX
  3084 000041EF 52                  <1> 	PUSH	eDX
  3085                              <1> 	;PUSH	DI
  3086                              <1> 	;;PUSH	DS
  3087                              <1> 	; 14/12/2014
  3088                              <1> 	;mov	word [DISK_POINTER], MD_TBL6
  3089                              <1> 	;mov	[DISK_POINTER+2], cs
  3090                              <1> 	;
  3091                              <1> 	;OR	byte [RTC_WAIT_FLAG], 1	; NO RTC WAIT, FORCE USE OF LOOP
  3092 000041F0 31FF                <1> 	XOR	eDI,eDI			; INITIALIZE DRIVE POINTER
  3093 000041F2 66C705[55590100]00- <1> 	MOV	WORD [DSK_STATE],0	; INITIALIZE STATES
  3093 000041FA 00                  <1>
  3094 000041FB 8025[50590100]33    <1> 	AND	byte [LASTRATE],~(STRT_MSK+SEND_MSK) ; CLEAR START & SEND
  3095 00004202 800D[50590100]C0    <1> 	OR	byte [LASTRATE],SEND_MSK ; INITIALIZE SENT TO IMPOSSIBLE
  3096 00004209 C605[45590100]00    <1> 	MOV	byte [SEEK_STATUS],0	; INDICATE RECALIBRATE NEEDED
  3097 00004210 C605[47590100]00    <1> 	MOV	byte [MOTOR_COUNT],0	; INITIALIZE MOTOR COUNT
  3098 00004217 C605[46590100]00    <1> 	MOV	byte [MOTOR_STATUS],0	; INITIALIZE DRIVES TO OFF STATE
  3099 0000421E C605[48590100]00    <1> 	MOV	byte [DSKETTE_STATUS],0	; NO ERRORS
  3100                              <1> 	;
  3101                              <1> 	; 28/02/2015
  3102                              <1> 	;mov	word [cfd], 100h 
  3103 00004225 E82BF2FFFF          <1> 	call	DSK_RESET
  3104 0000422A 5A                  <1> 	pop	edx
  3105 0000422B F8                  <1> 	clc	; 29/05/2016
  3106 0000422C C3                  <1> 	retn
  3107                              <1> 
  3108                              <1> ;SUP0:
  3109                              <1> ;	CALL	DRIVE_DET		; DETERMINE DRIVE
  3110                              <1> ;	CALL	XLAT_OLD		; TRANSLATE STATE TO COMPATIBLE MODE
  3111                              <1> ;	; 02/01/2015
  3112                              <1> ;	;INC	DI			; POINT TO NEXT DRIVE
  3113                              <1> ;	;CMP	DI,MAX_DRV		; SEE IF DONE
  3114                              <1> ;	;JNZ	short SUP0		; REPEAT FOR EACH ORIVE
  3115                              <1> ;       cmp     byte [fd1_type], 0	
  3116                              <1> ;	jna	short sup1
  3117                              <1> ;	or	di, di
  3118                              <1> ;	jnz	short sup1
  3119                              <1> ;	inc	di
  3120                              <1> ;       jmp     short SUP0
  3121                              <1> ;sup1:
  3122                              <1> ;	MOV	byte [SEEK_STATUS],0	; FORCE RECALIBRATE
  3123                              <1> ;	;AND	byte [RTC_WAIT_FLAG],0FEH ; ALLOW FOR RTC WAIT
  3124                              <1> ;	CALL	SETUP_END		; VARIOUS CLEANUPS
  3125                              <1> ;	;;POP	DS			; RESTORE CALLERS REGISTERS
  3126                              <1> ;	;POP	DI
  3127                              <1> ;	POP	eDX
  3128                              <1> ;	;POP	CX
  3129                              <1> ;	;POP	BX
  3130                              <1> ;	;POP	AX
  3131                              <1> ;	RETn
  3132                              <1> 
  3133                              <1> ;//////////////////////////////////////////////////////
  3134                              <1> ;; END OF DISKETTE I/O ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  3135                              <1> ;
  3136                              <1> 
  3137                              <1> int13h: ; 21/02/2015
  3138 0000422D F8                  <1> 	clc ; 20/07/2020
  3139 0000422E 9C                  <1> 	pushfd
  3140 0000422F 0E                  <1> 	push 	cs
  3141 00004230 E848010000          <1> 	call 	DISK_IO
  3142 00004235 C3                  <1> 	retn
  3143                              <1> 
  3144                              <1> ;;;;;; DISK I/O ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 21/02/2015 ;;;
  3145                              <1> ;/////////////////////////////////////////////////////////////////////
  3146                              <1> 
  3147                              <1> ; DISK I/O - Erdogan Tan (Retro UNIX 386 v1 project)
  3148                              <1> ; 18/02/2016
  3149                              <1> ; 17/02/2016
  3150                              <1> ; 23/02/2015
  3151                              <1> ; 21/02/2015 (unix386.s)
  3152                              <1> ; 22/12/2014 - 14/02/2015 (dsectrm2.s)
  3153                              <1> ;
  3154                              <1> ; Original Source Code:
  3155                              <1> ; DISK ----- 09/25/85 FIXED DISK BIOS
  3156                              <1> ; (IBM PC XT Model 286 System BIOS Source Code, 04-21-86)
  3157                              <1> ;
  3158                              <1> ; Modifications: by reference of AWARD BIOS 1999 (D1A0622) 
  3159                              <1> ;		 Source Code - ATORGS.ASM, AHDSK.ASM
  3160                              <1> ;
  3161                              <1> 
  3162                              <1> 
  3163                              <1> ;The wait for controller to be not busy is 10 seconds.
  3164                              <1> ;10,000,000 / 30 = 333,333.  333,333 decimal = 051615h
  3165                              <1> ;;WAIT_HDU_CTLR_BUSY_LO	equ	1615h		
  3166                              <1> ;;WAIT_HDU_CTLR_BUSY_HI	equ	  05h
  3167                              <1> WAIT_HDU_CTRL_BUSY_LH	equ	51615h	 ;21/02/2015		
  3168                              <1> 
  3169                              <1> ;The wait for controller to issue completion interrupt is 10 seconds.
  3170                              <1> ;10,000,000 / 30 = 333,333.  333,333 decimal = 051615h
  3171                              <1> ;;WAIT_HDU_INT_LO	equ	1615h
  3172                              <1> ;;WAIT_HDU_INT_HI	equ	  05h
  3173                              <1> WAIT_HDU_INT_LH		equ	51615h	; 21/02/2015
  3174                              <1> 
  3175                              <1> ;The wait for Data request on read and write longs is
  3176                              <1> ;2000 us. (?)
  3177                              <1> ;;WAIT_HDU_DRQ_LO	equ	1000	; 03E8h
  3178                              <1> ;;WAIT_HDU_DRQ_HI	equ	0
  3179                              <1> WAIT_HDU_DRQ_LH		equ	1000	; 21/02/2015
  3180                              <1> 
  3181                              <1> ; Port 61h (PORT_B)
  3182                              <1> SYS1		equ	61h	; PORT_B  (diskette.inc)
  3183                              <1> 
  3184                              <1> ; 23/12/2014
  3185                              <1> %define CMD_BLOCK       eBP-8  ; 21/02/2015
  3186                              <1> 
  3187                              <1> ; 30/08/2020 - TRDOS 386 v2
  3188                              <1> 
  3189                              <1> ;--- INT 13H -------------------------------------------------------------------
  3190                              <1> ;									       :
  3191                              <1> ; FIXED DISK I/O INTERFACE						       :
  3192                              <1> ;									       :
  3193                              <1> ;	THIS INTERFACE PROVIDES ACCESS TO 5 1/4" FIXED DISKS THROUGH           :
  3194                              <1> ;	THE IBM FIXED DISK CONTROLLER.					       :
  3195                              <1> ;									       :
  3196                              <1> ;	THE  BIOS  ROUTINES  ARE  MEANT  TO  BE  ACCESSED  THROUGH	       :
  3197                              <1> ;	SOFTWARE  INTERRUPTS  ONLY.    ANY  ADDRESSES  PRESENT	IN	       :
  3198                              <1> ;	THESE  LISTINGS  ARE  INCLUDED	 ONLY	FOR  COMPLETENESS,	       :
  3199                              <1> ;	NOT  FOR  REFERENCE.  APPLICATIONS   WHICH  REFERENCE  ANY	       :
  3200                              <1> ;	ABSOLUTE  ADDRESSES  WITHIN  THE  CODE	SEGMENTS  OF  BIOS	       :
  3201                              <1> ;	VIOLATE  THE  STRUCTURE  AND  DESIGN  OF  BIOS. 		       :
  3202                              <1> ;									       :
  3203                              <1> ;------------------------------------------------------------------------------:
  3204                              <1> ;									       :
  3205                              <1> ; INPUT  (AH)= HEX COMMAND VALUE					       :
  3206                              <1> ;									       :
  3207                              <1> ;	(AH)= 00H  RESET DISK (DL = 80H,81H) / DISKETTE 		       :
  3208                              <1> ;	(AH)= 01H  READ THE STATUS OF THE LAST DISK OPERATION INTO (AL)        :
  3209                              <1> ;		    NOTE: DL < 80H - DISKETTE				       :
  3210                              <1> ;			  DL > 80H - DISK				       :
  3211                              <1> ;	(AH)= 02H  READ THE DESIRED SECTORS INTO MEMORY 		       :
  3212                              <1> ;	(AH)= 03H  WRITE THE DESIRED SECTORS FROM MEMORY		       :
  3213                              <1> ;	(AH)= 04H  VERIFY THE DESIRED SECTORS				       :
  3214                              <1> ;	(AH)= 05H  FORMAT THE DESIRED TRACK				       :
  3215                              <1> ;	(AH)= 06H  UNUSED						       :
  3216                              <1> ;	(AH)= 07H  UNUSED						       :
  3217                              <1> ;	(AH)= 08H  RETURN THE CURRENT DRIVE PARAMETERS			       :
  3218                              <1> ;	(AH)= 09H  INITIALIZE DRIVE PAIR CHARACTERISTICS		       :
  3219                              <1> ;		    INTERRUPT 41 POINTS TO DATA BLOCK FOR DRIVE 0	       :
  3220                              <1> ;		    INTERRUPT 46 POINTS TO DATA BLOCK FOR DRIVE 1	       :
  3221                              <1> ;	(AH)= 0AH  READ LONG						       :
  3222                              <1> ;	(AH)= 0BH  WRITE LONG  (READ & WRITE LONG ENCOMPASS 512 + 4 BYTES ECC) :
  3223                              <1> ;	(AH)= 0CH  SEEK 						       :
  3224                              <1> ;	(AH)= 0DH  ALTERNATE DISK RESET (SEE DL)			       :
  3225                              <1> ;	(AH)= 0EH  UNUSED						       :
  3226                              <1> ;	(AH)= 0FH  UNUSED						       :
  3227                              <1> ;	(AH)= 10H  TEST DRIVE READY					       :
  3228                              <1> ;	(AH)= 11H  RECALIBRATE						       :
  3229                              <1> ;	(AH)= 12H  UNUSED						       :
  3230                              <1> ;	(AH)= 13H  UNUSED						       :
  3231                              <1> ;	(AH)= 14H  CONTROLLER INTERNAL DIAGNOSTIC			       :
  3232                              <1> ;	(AH)= 15H  READ DASD TYPE					       :
  3233                              <1> ;									       :
  3234                              <1> ;-------------------------------------------------------------------------------
  3235                              <1> ;									       :
  3236                              <1> ;	REGISTERS USED FOR FIXED DISK OPERATIONS			       :
  3237                              <1> ;									       :
  3238                              <1> ;		(DL)	-  DRIVE NUMBER     (80H-81H FOR DISK. VALUE CHECKED)  :
  3239                              <1> ;		(DH)	-  HEAD NUMBER	    (0-15 ALLOWED, NOT VALUE CHECKED)  :
  3240                              <1> ;		(CH)	-  CYLINDER NUMBER  (0-1023, NOT VALUE CHECKED)(SEE CL):
  3241                              <1> ;		(CL)	-  SECTOR NUMBER    (1-17, NOT VALUE CHECKED)	       :
  3242                              <1> ;									       :
  3243                              <1> ;			   NOTE: HIGH 2 BITS OF CYLINDER NUMBER ARE PLACED     :
  3244                              <1> ;				 IN THE HIGH 2 BITS OF THE CL REGISTER	       :
  3245                              <1> ;				 (10 BITS TOTAL)			       :
  3246                              <1> ;									       :
  3247                              <1> ;		(AL)	-  NUMBER OF SECTORS (MAXIMUM POSSIBLE RANGE 1-80H,    :
  3248                              <1> ;					      FOR READ/WRITE LONG 1-79H)       :
  3249                              <1> ;									       :
  3250                              <1> ;		(ES:BX) -  ADDRESS OF BUFFER FOR READS AND WRITES,	       :
  3251                              <1> ;			   (NOT REQUIRED FOR VERIFY)			       :
  3252                              <1> ;									       :
  3253                              <1> ;		FORMAT (AH=5) ES:BX POINTS TO A 512 BYTE BUFFER. THE FIRST     :
  3254                              <1> ;			   2*(SECTORS/TRACK) BYTES CONTAIN F,N FOR EACH SECTOR.:
  3255                              <1> ;			   F = 00H FOR A GOOD SECTOR			       :
  3256                              <1> ;			       80H FOR A BAD SECTOR			       :
  3257                              <1> ;			   N = SECTOR NUMBER				       :
  3258                              <1> ;			   FOR AN INTERLEAVE OF 2 AND 17 SECTORS/TRACK	       :
  3259                              <1> ;			   THE TABLE SHOULD BE: 			       :
  3260                              <1> ;									       :
  3261                              <1> ;		   DB	   00H,01H,00H,0AH,00H,02H,00H,0BH,00H,03H,00H,0CH     :
  3262                              <1> ;		   DB	   00H,04H,00H,0DH,00H,05H,00H,0EH,00H,06H,00H,0FH     :
  3263                              <1> ;		   DB	   00H,07H,00H,10H,00H,08H,00H,11H,00H,09H	       :
  3264                              <1> ;									       :
  3265                              <1> ;-------------------------------------------------------------------------------
  3266                              <1> 
  3267                              <1> ;-------------------------------------------------------------------------------
  3268                              <1> ; OUTPUT								       :
  3269                              <1> ;	AH = STATUS OF CURRENT OPERATION				       :
  3270                              <1> ;	     STATUS BITS ARE DEFINED IN THE EQUATES BELOW		       :
  3271                              <1> ;	CY = 0	SUCCESSFUL OPERATION (AH=0 ON RETURN)			       :
  3272                              <1> ;	CY = 1	FAILED OPERATION (AH HAS ERROR REASON)			       :
  3273                              <1> ;									       :
  3274                              <1> ;	NOTE:	ERROR 11H  INDICATES THAT THE DATA READ HAD A RECOVERABLE      :
  3275                              <1> ;		ERROR WHICH WAS CORRECTED BY THE ECC ALGORITHM.  THE DATA      :
  3276                              <1> ;		IS PROBABLY GOOD,   HOWEVER THE BIOS ROUTINE INDICATES AN      :
  3277                              <1> ;		ERROR TO ALLOW THE CONTROLLING PROGRAM A CHANCE TO DECIDE      :
  3278                              <1> ;		FOR ITSELF.  THE  ERROR  MAY  NOT  RECUR  IF  THE DATA IS      :
  3279                              <1> ;		REWRITTEN.						       :
  3280                              <1> ;									       :
  3281                              <1> ;	IF DRIVE PARAMETERS WERE REQUESTED (DL >= 80H), 		       :
  3282                              <1> ;	   INPUT:							       :
  3283                              <1> ;	     (DL) = DRIVE NUMBER					       :	
  3284                              <1> ;	     ; 27/05/2016 - TRDOS 386 (TRDOS v2.0)						       :	 	
  3285                              <1> ;	     EBX = Buffer address for fixed disk parameters table (32 bytes)   :
  3286                              <1> ;	   OUTPUT:							       :
  3287                              <1> ;	     (DL) = NUMBER OF CONSECUTIVE ACKNOWLEDGING DRIVES ATTACHED (1-2)  :
  3288                              <1> ;		    (CONTROLLER CARD ZERO TALLY ONLY)			       :
  3289                              <1> ;	     (DH) = MAXIMUM USEABLE VALUE FOR HEAD NUMBER		       :
  3290                              <1> ;	     (CH) = MAXIMUM USEABLE VALUE FOR CYLINDER NUMBER		       :
  3291                              <1> ;	     (CL) = MAXIMUM USEABLE VALUE FOR SECTOR NUMBER		       :
  3292                              <1> ;		    AND CYLINDER NUMBER HIGH BITS			       :
  3293                              <1> ;									       :
  3294                              <1> ;	IF READ DASD TYPE WAS REQUESTED,				       :
  3295                              <1> ;									       :
  3296                              <1> ;	AH = 0 - NOT PRESENT						       :
  3297                              <1> ;	     1 - DISKETTE - NO CHANGE LINE AVAILABLE			       :
  3298                              <1> ;	     2 - DISKETTE - CHANGE LINE AVAILABLE			       :
  3299                              <1> ;	     3 - FIXED DISK						       :
  3300                              <1> ;									       :
  3301                              <1> ;	CX,DX = NUMBER OF 512 BYTE BLOCKS WHEN AH = 3			       :
  3302                              <1> ;									       :
  3303                              <1> ;	REGISTERS WILL BE PRESERVED EXCEPT WHEN THEY ARE USED TO RETURN        :
  3304                              <1> ;	INFORMATION.							       :
  3305                              <1> ;									       :
  3306                              <1> ;	NOTE: IF AN ERROR IS REPORTED BY THE DISK CODE, THE APPROPRIATE        :
  3307                              <1> ;		ACTION IS TO RESET THE DISK, THEN RETRY THE OPERATION.	       :
  3308                              <1> ;									       :
  3309                              <1> ;-------------------------------------------------------------------------------
  3310                              <1> 
  3311                              <1> SENSE_FAIL	EQU	0FFH		; NOT IMPLEMENTED
  3312                              <1> NO_ERR		EQU	0E0H		; STATUS ERROR/ERROR REGISTER=0
  3313                              <1> WRITE_FAULT	EQU	0CCH		; WRITE FAULT ON SELECTED DRIVE
  3314                              <1> UNDEF_ERR	EQU	0BBH		; UNDEFINED ERROR OCCURRED
  3315                              <1> NOT_RDY 	EQU	0AAH		; DRIVE NOT READY
  3316                              <1> TIME_OUT	EQU	80H		; ATTACHMENT FAILED TO RESPOND
  3317                              <1> BAD_SEEK	EQU	40H		; SEEK OPERATION FAILED
  3318                              <1> BAD_CNTLR	EQU	20H		; CONTROLLER HAS FAILED
  3319                              <1> DATA_CORRECTED	EQU	11H		; ECC CORRECTED DATA ERROR
  3320                              <1> BAD_ECC 	EQU	10H		; BAD ECC ON DISK READ
  3321                              <1> BAD_TRACK	EQU	0BH		; NOT IMPLEMENTED
  3322                              <1> BAD_SECTOR	EQU	0AH		; BAD SECTOR FLAG DETECTED
  3323                              <1> ;DMA_BOUNDARY	EQU	09H		; DATA EXTENDS TOO FAR
  3324                              <1> INIT_FAIL	EQU	07H		; DRIVE PARAMETER ACTIVITY FAILED
  3325                              <1> BAD_RESET	EQU	05H		; RESET FAILED
  3326                              <1> ;RECORD_NOT_FND	EQU	04H		; REQUESTED SECTOR NOT FOUND
  3327                              <1> ;BAD_ADDR_MARK	EQU	02H		; ADDRESS MARK NOT FOUND
  3328                              <1> ;BAD_CMD 	EQU	01H		; BAD COMMAND PASSED TO DISK I/O
  3329                              <1> 
  3330                              <1> ;--------------------------------------------------------
  3331                              <1> ;							:
  3332                              <1> ; FIXED DISK PARAMETER TABLE				:
  3333                              <1> ;  -  THE TABLE IS COMPOSED OF A BLOCK DEFINED AS:	:
  3334                              <1> ;							:
  3335                              <1> ;  +0	(1 WORD) - MAXIMUM NUMBER OF CYLINDERS		:
  3336                              <1> ;  +2	(1 BYTE) - MAXIMUM NUMBER OF HEADS		:
  3337                              <1> ;  +3	(1 WORD) - NOT USED/SEE PC-XT			:
  3338                              <1> ;  +5	(1 WORD) - STARTING WRITE PRECOMPENSATION CYL	:
  3339                              <1> ;  +7	(1 BYTE) - MAXIMUM ECC DATA BURST LENGTH	:
  3340                              <1> ;  +8	(1 BYTE) - CONTROL BYTE 			:
  3341                              <1> ;		   BIT	  7 DISABLE RETRIES -OR-	:
  3342                              <1> ;		   BIT	  6 DISABLE RETRIES		:
  3343                              <1> ;		   BIT	  3 MORE THAN 8 HEADS		:
  3344                              <1> ;  +9	(3 BYTES)- NOT USED/SEE PC-XT			:
  3345                              <1> ; +12	(1 WORD) - LANDING ZONE 			:
  3346                              <1> ; +14	(1 BYTE) - NUMBER OF SECTORS/TRACK		:
  3347                              <1> ; +15	(1 BYTE) - RESERVED FOR FUTURE USE		:
  3348                              <1> ;							:
  3349                              <1> ;	 - TO DYNAMICALLY DEFINE A SET OF PARAMETERS	:
  3350                              <1> ;	   BUILD A TABLE FOR UP TO 15 TYPES AND PLACE	:
  3351                              <1> ;	   THE CORRESPONDING VECTOR INTO INTERRUPT 41	:
  3352                              <1> ;	   FOR DRIVE 0 AND INTERRUPT 46 FOR DRIVE 1.	:
  3353                              <1> ;							:
  3354                              <1> ;--------------------------------------------------------
  3355                              <1> 
  3356                              <1> ;--------------------------------------------------------
  3357                              <1> ;							:
  3358                              <1> ; HARDWARE SPECIFIC VALUES				:
  3359                              <1> ;							:
  3360                              <1> ;  -  CONTROLLER I/O PORT				:
  3361                              <1> ;							:
  3362                              <1> ;     > WHEN READ FROM: 				:
  3363                              <1> ;	HF_PORT+0 - READ DATA (FROM CONTROLLER TO CPU)	:
  3364                              <1> ;	HF_PORT+1 - GET ERROR REGISTER			:
  3365                              <1> ;	HF_PORT+2 - GET SECTOR COUNT			:
  3366                              <1> ;	HF_PORT+3 - GET SECTOR NUMBER			:
  3367                              <1> ;	HF_PORT+4 - GET CYLINDER LOW			:
  3368                              <1> ;	HF_PORT+5 - GET CYLINDER HIGH (2 BITS)		:
  3369                              <1> ;	HF_PORT+6 - GET SIZE/DRIVE/HEAD 		:
  3370                              <1> ;	HF_PORT+7 - GET STATUS REGISTER 		:
  3371                              <1> ;							:
  3372                              <1> ;     > WHEN WRITTEN TO:				:
  3373                              <1> ;	HF_PORT+0 - WRITE DATA (FROM CPU TO CONTROLLER) :
  3374                              <1> ;	HF_PORT+1 - SET PRECOMPENSATION CYLINDER	:
  3375                              <1> ;	HF_PORT+2 - SET SECTOR COUNT			:
  3376                              <1> ;	HF_PORT+3 - SET SECTOR NUMBER			:
  3377                              <1> ;	HF_PORT+4 - SET CYLINDER LOW			:
  3378                              <1> ;	HF_PORT+5 - SET CYLINDER HIGH (2 BITS)		:
  3379                              <1> ;	HF_PORT+6 - SET SIZE/DRIVE/HEAD 		:
  3380                              <1> ;	HF_PORT+7 - SET COMMAND REGISTER		:
  3381                              <1> ;							:
  3382                              <1> ;--------------------------------------------------------
  3383                              <1> 
  3384                              <1> ;HF_PORT 	EQU	01F0H	; DISK PORT
  3385                              <1> ;HF1_PORT	equ	0170h	
  3386                              <1> ;HF_REG_PORT	EQU	03F6H
  3387                              <1> ;HF1_REG_PORT	equ	0376h
  3388                              <1> 
  3389                              <1> HDC1_BASEPORT	equ	1F0h
  3390                              <1> HDC2_BASEPORT	equ	170h		
  3391                              <1> 
  3392                              <1> align 2
  3393                              <1> 
  3394                              <1> ;-----		STATUS REGISTER
  3395                              <1> 
  3396                              <1> ST_ERROR	EQU	00000001B	;
  3397                              <1> ST_INDEX	EQU	00000010B	;
  3398                              <1> ST_CORRCTD	EQU	00000100B	; ECC CORRECTION SUCCESSFUL
  3399                              <1> ST_DRQ		EQU	00001000B	;
  3400                              <1> ST_SEEK_COMPL	EQU	00010000B	; SEEK COMPLETE
  3401                              <1> ST_WRT_FLT	EQU	00100000B	; WRITE FAULT
  3402                              <1> ST_READY	EQU	01000000B	;
  3403                              <1> ST_BUSY 	EQU	10000000B	;
  3404                              <1> 
  3405                              <1> ;-----		ERROR REGISTER
  3406                              <1> 
  3407                              <1> ERR_DAM 	EQU	00000001B	; DATA ADDRESS MARK NOT FOUND
  3408                              <1> ERR_TRK_0	EQU	00000010B	; TRACK 0 NOT FOUND ON RECAL
  3409                              <1> ERR_ABORT	EQU	00000100B	; ABORTED COMMAND
  3410                              <1> ;		EQU	00001000B	; NOT USED
  3411                              <1> ERR_ID		EQU	00010000B	; ID NOT FOUND
  3412                              <1> ;		EQU	00100000B	; NOT USED
  3413                              <1> ERR_DATA_ECC	EQU	01000000B
  3414                              <1> ERR_BAD_BLOCK	EQU	10000000B
  3415                              <1> 
  3416                              <1> 
  3417                              <1> RECAL_CMD	EQU	00010000B	; DRIVE RECAL	(10H)
  3418                              <1> READ_CMD	EQU	00100000B	;	READ	(20H)
  3419                              <1> WRITE_CMD	EQU	00110000B	;	WRITE	(30H)
  3420                              <1> VERIFY_CMD	EQU	01000000B	;	VERIFY	(40H)
  3421                              <1> FMTTRK_CMD	EQU	01010000B	; FORMAT TRACK	(50H)
  3422                              <1> INIT_CMD	EQU	01100000B	;   INITIALIZE	(60H)
  3423                              <1> SEEK_CMD	EQU	01110000B	;	SEEK	(70H)
  3424                              <1> DIAG_CMD	EQU	10010000B	; DIAGNOSTIC	(90H)
  3425                              <1> SET_PARM_CMD	EQU	10010001B	; DRIVE PARMS	(91H)
  3426                              <1> NO_RETRIES	EQU	00000001B	; CHD MODIFIER	(01H)
  3427                              <1> ECC_MODE	EQU	00000010B	; CMD MODIFIER	(02H)
  3428                              <1> BUFFER_MODE	EQU	00001000B	; CMD MODIFIER	(08H)
  3429                              <1> 
  3430                              <1> ;MAX_FILE	EQU	2
  3431                              <1> ;S_MAX_FILE	EQU	2
  3432                              <1> MAX_FILE	equ	4		; 22/12/2014
  3433                              <1> S_MAX_FILE	equ	4		; 22/12/2014
  3434                              <1> 
  3435                              <1> DELAY_1 	EQU	25H		; DELAY FOR OPERATION COMPLETE
  3436                              <1> DELAY_2 	EQU	0600H		; DELAY FOR READY
  3437                              <1> DELAY_3 	EQU	0100H		; DELAY FOR DATA REQUEST
  3438                              <1> 
  3439                              <1> HF_FAIL 	EQU	08H		; CMOS FLAG IN BYTE 0EH
  3440                              <1> 
  3441                              <1> ;-----		COMMAND BLOCK REFERENCE
  3442                              <1> 
  3443                              <1> ;CMD_BLOCK      EQU     BP-8            ; @CMD_BLOCK REFERENCES BLOCK HEAD IN SS
  3444                              <1> 					;  (BP) POINTS TO COMMAND BLOCK TAIL
  3445                              <1> 					;	AS DEFINED BY THE "ENTER" PARMS
  3446                              <1> ; 19/12/2014
  3447                              <1> ORG_VECTOR	equ	4*13h		; INT 13h vector
  3448                              <1> DISK_VECTOR	equ	4*40h		; INT 40h vector (for floppy disks)
  3449                              <1> ;HDISK_INT	equ	4*76h		; Primary HDC - Hardware interrupt (IRQ14)
  3450                              <1> ;HDISK_INT1	equ	4*76h		; Primary HDC - Hardware interrupt (IRQ14)
  3451                              <1> ;HDISK_INT2	equ	4*77h		; Secondary HDC - Hardware interrupt (IRQ15)
  3452                              <1> ;HF_TBL_VEC	equ	4*41h		; Pointer to 1st fixed disk parameter table
  3453                              <1> ;HF1_TBL_VEC	equ	4*46h		; Pointer to 2nd fixed disk parameter table
  3454                              <1> 
  3455                              <1> align 2
  3456                              <1> 
  3457                              <1> ;----------------------------------------------------------------
  3458                              <1> ; FIXED DISK I/O SETUP						:
  3459                              <1> ;								:
  3460                              <1> ;  -  ESTABLISH TRANSFER VECTORS FOR THE FIXED DISK		:
  3461                              <1> ;  -  PERFORM POWER ON DIAGNOSTICS				:
  3462                              <1> ;     SHOULD AN ERROR OCCUR A "1701" MESSAGE IS DISPLAYED       :
  3463                              <1> ;								:
  3464                              <1> ;----------------------------------------------------------------
  3465                              <1> 
  3466                              <1> ; 29/05/2016 - TRDOS 386 (TRDOS v2.0)
  3467                              <1> 
  3468                              <1> DISK_SETUP:
  3469                              <1> 	;CLI
  3470                              <1> 	;;MOV	AX,ABS0 			; GET ABSOLUTE SEGMENT
  3471                              <1> 	;xor	ax,ax
  3472                              <1> 	;MOV	DS,AX				; SET SEGMENT REGISTER
  3473                              <1> 	;MOV	AX, [ORG_VECTOR] 		; GET DISKETTE VECTOR
  3474                              <1> 	;MOV	[DISK_VECTOR],AX		;  INTO INT 40H
  3475                              <1> 	;MOV	AX, [ORG_VECTOR+2]
  3476                              <1> 	;MOV	[DISK_VECTOR+2],AX
  3477                              <1> 	;MOV	word [ORG_VECTOR],DISK_IO	; FIXED DISK HANDLER
  3478                              <1> 	;MOV	[ORG_VECTOR+2],CS
  3479                              <1> 	; 1st controller (primary master, slave)   - IRQ 14
  3480                              <1> 	;;MOV	word [HDISK_INT],HD_INT		; FIXED DISK INTERRUPT
  3481                              <1> 	;mov	word [HDISK_INT1],HD_INT	;
  3482                              <1> 	;;MOV	[HDISK_INT+2],CS
  3483                              <1> 	;mov	[HDISK_INT1+2],CS
  3484                              <1> 	; 2nd controller (secondary master, slave) - IRQ 15
  3485                              <1> 	;mov	word [HDISK_INT2],HD1_INT	;
  3486                              <1> 	;mov	[HDISK_INT2+2],CS
  3487                              <1> 	;
  3488                              <1> 	;;MOV	word [HF_TBL_VEC],HD0_DPT	; PARM TABLE DRIVE 80
  3489                              <1> 	;;MOV	word [HF_TBL_VEC+2],DPT_SEGM
  3490                              <1> 	;;MOV	word [HF1_TBL_VEC],HD1_DPT	; PARM TABLE DRIVE 81
  3491                              <1> 	;;MOV	word [HF1_TBL_VEC+2],DPT_SEGM
  3492                              <1> 	;push	cs
  3493                              <1> 	;pop	ds
  3494                              <1> 	;mov	word [HDPM_TBL_VEC],HD0_DPT	; PARM TABLE DRIVE 80h
  3495                              <1> 	;mov	word [HDPM_TBL_VEC+2],DPT_SEGM
  3496 00004236 C705[60590100]0000- <1> 	mov 	dword [HDPM_TBL_VEC], (DPT_SEGM*16)+HD0_DPT
  3496 0000423E 0900                <1>
  3497                              <1> 	;mov	word [HDPS_TBL_VEC],HD1_DPT	; PARM TABLE DRIVE 81h
  3498                              <1> 	;mov	word [HDPS_TBL_VEC+2],DPT_SEGM
  3499 00004240 C705[64590100]2000- <1> 	mov 	dword [HDPS_TBL_VEC], (DPT_SEGM*16)+HD1_DPT
  3499 00004248 0900                <1>
  3500                              <1> 	;mov	word [HDSM_TBL_VEC],HD2_DPT	; PARM TABLE DRIVE 82h
  3501                              <1> 	;mov	word [HDSM_TBL_VEC+2],DPT_SEGM
  3502 0000424A C705[68590100]4000- <1> 	mov 	dword [HDSM_TBL_VEC], (DPT_SEGM*16)+HD2_DPT
  3502 00004252 0900                <1>
  3503                              <1> 	;mov	word [HDSS_TBL_VEC],HD3_DPT	; PARM TABLE DRIVE 83h
  3504                              <1> 	;mov	word [HDSS_TBL_VEC+2],DPT_SEGM
  3505 00004254 C705[6C590100]6000- <1> 	mov 	dword [HDSS_TBL_VEC], (DPT_SEGM*16)+HD3_DPT
  3505 0000425C 0900                <1>
  3506                              <1> 	;
  3507                              <1> 	;;IN	AL,INTB01		; TURN ON SECOND INTERRUPT CHIP
  3508                              <1> 	;;;AND	AL,0BFH
  3509                              <1> 	;;and	al, 3Fh			; enable IRQ 14 and IRQ 15
  3510                              <1> 	;;;JMP	$+2
  3511                              <1> 	;;IODELAY
  3512                              <1> 	;;OUT	INTB01,AL
  3513                              <1> 	;;IODELAY
  3514                              <1> 	;;IN	AL,INTA01		; LET INTERRUPTS PASS THRU TO
  3515                              <1> 	;;AND	AL,0FBH 		;  SECOND CHIP
  3516                              <1> 	;;;JMP	$+2
  3517                              <1> 	;;IODELAY
  3518                              <1> 	;;OUT	INTA01,AL
  3519                              <1> 	;
  3520                              <1> 	;STI
  3521                              <1> 	;;PUSH	DS			; MOVE ABS0 POINTER TO
  3522                              <1> 	;;POP	ES			; EXTRA SEGMENT POINTER
  3523                              <1> 	;;;CALL	DDS			; ESTABLISH DATA SEGMENT
  3524                              <1> 	;;MOV	byte [DISK_STATUS1],0 	; RESET THE STATUS INDICATOR
  3525                              <1> 	;;MOV	byte [HF_NUM],0		; ZERO NUMBER OF FIXED DISKS
  3526                              <1> 	;;MOV	byte [CONTROL_BYTE],0
  3527                              <1> 	;;MOV	byte [PORT_OFF],0	; ZERO CARD OFFSET
  3528                              <1> 	; 20/12/2014 - private code by Erdogan Tan
  3529                              <1> 		      ; (out of original PC-AT, PC-XT BIOS code)
  3530                              <1> 	;mov	si, hd0_type
  3531 0000425E BE[585D0000]        <1> 	mov	esi, hd0_type
  3532                              <1> 	;mov	cx, 4
  3533 00004263 B904000000          <1> 	mov	ecx, 4
  3534                              <1> hde_l:
  3535 00004268 AC                  <1> 	lodsb
  3536 00004269 3C80                <1> 	cmp	al, 80h			; 8?h = existing
  3537 0000426B 7206                <1> 	jb	short _L4
  3538 0000426D FE05[5C590100]      <1> 	inc	byte [HF_NUM]		; + 1 hard (fixed) disk drives
  3539                              <1> _L4: ; 26/02/2015
  3540 00004273 E2F3                <1> 	loop	hde_l	
  3541                              <1> ;_L4:					; 0 <= [HF_NUM] =< 4
  3542                              <1> ;L4:
  3543                              <1> 	; 
  3544                              <1> 	;; 31/12/2014 - cancel controller diagnostics here
  3545                              <1> 	;;;mov 	cx, 3  ; 26/12/2014 (Award BIOS 1999)
  3546                              <1> 	;;mov 	cl, 3
  3547                              <1> 	;;
  3548                              <1> 	;;MOV	DL,80H			; CHECK THE CONTROLLER
  3549                              <1> ;;hdc_dl:
  3550                              <1> 	;;MOV	AH,14H			; USE CONTROLLER DIAGNOSTIC COMMAND
  3551                              <1> 	;;INT	13H			; CALL BIOS WITH DIAGNOSTIC COMMAND
  3552                              <1> 	;;;JC	short CTL_ERRX		; DISPLAY ERROR MESSAGE IF BAD RETURN
  3553                              <1> 	;;;jc	short POD_DONE ;22/12/2014
  3554                              <1> 	;;jnc	short hdc_reset0
  3555                              <1> 	;;loop	hdc_dl
  3556                              <1> 	;;; 27/12/2014
  3557                              <1> 	;;stc
  3558                              <1> 	;;retn
  3559                              <1> 	;
  3560                              <1> ;;hdc_reset0:
  3561                              <1> 	; 18/01/2015
  3562 00004275 8A0D[5C590100]      <1> 	mov	cl, [HF_NUM]
  3563 0000427B 20C9                <1> 	and	cl, cl
  3564 0000427D 740E                <1> 	jz	short POD_DONE
  3565                              <1> 	;
  3566 0000427F B27F                <1> 	mov	dl, 7Fh
  3567                              <1> hdc_reset1:
  3568 00004281 FEC2                <1> 	inc	dl
  3569                              <1> 	;; 31/12/2015
  3570                              <1> 	;;push	dx
  3571                              <1> 	;;push	cx
  3572                              <1> 	;;push	ds
  3573                              <1> 	;;sub	ax, ax
  3574                              <1> 	;;mov	ds, ax
  3575                              <1> 	;;MOV	AX, [TIMER_LOW]		; GET START TIMER COUNTS
  3576                              <1> 	;;pop	ds
  3577                              <1> 	;;MOV	BX,AX
  3578                              <1> 	;;ADD	AX,6*182		; 60 SECONDS* 18.2
  3579                              <1> 	;;MOV	CX,AX
  3580                              <1> 	;;mov	word [wait_count], 0	; 22/12/2014 (reset wait counter)
  3581                              <1> 	;;
  3582                              <1> 	;; 31/12/2014 - cancel HD_RESET_1
  3583                              <1> 	;;CALL	HD_RESET_1		; SET UP DRIVE 0, (1,2,3)
  3584                              <1> 	;;pop	cx
  3585                              <1> 	;;pop	dx
  3586                              <1> 	;;
  3587                              <1> 	; 18/01/2015
  3588 00004283 B40D                <1> 	mov	ah, 0Dh ; ALTERNATE RESET
  3589                              <1> 	;int	13h
  3590 00004285 E8A3FFFFFF          <1> 	call	int13h
  3591 0000428A E2F5                <1> 	loop	hdc_reset1
  3592 0000428C F8                  <1> 	clc 	; 29/05/2016
  3593                              <1> POD_DONE:
  3594 0000428D C3                  <1> 	RETn
  3595                              <1> 
  3596                              <1> ;;-----	POD_ERROR
  3597                              <1> 
  3598                              <1> ;;CTL_ERRX:
  3599                              <1> ;	;MOV	SI,OFFSET F1782 	; CONTROLLER ERROR
  3600                              <1> ;	;CALL	SET_FAIL		; DO NOT IPL FROM DISK
  3601                              <1> ;	;CALL	E_MSG			; DISPLAY ERROR AND SET (BP) ERROR FLAG
  3602                              <1> ;	;JMP	short POD_DONE
  3603                              <1> 
  3604                              <1> ;;HD_RESET_1:
  3605                              <1> ;;	;PUSH	BX			; SAVE TIMER LIMITS
  3606                              <1> ;;	;PUSH	CX
  3607                              <1> ;;RES_1: MOV	AH,09H			; SET DRIVE PARAMETERS
  3608                              <1> ;;	INT	13H
  3609                              <1> ;;	JC	short RES_2
  3610                              <1> ;;	MOV	AH,11H			; RECALIBRATE DRIVE
  3611                              <1> ;;	INT	13H
  3612                              <1> ;;	JNC	short RES_CK		; DRIVE OK
  3613                              <1> ;;RES_2: ;CALL	POD_TCHK		; CHECK TIME OUT
  3614                              <1> ;;	cmp	word [wait_count], 6*182 ; waiting time (in timer ticks)
  3615                              <1> ;;					; (30 seconds)		
  3616                              <1> ;;	;cmc
  3617                              <1> ;;	;JNC	short RES_1
  3618                              <1> ;;	jb	short RES_1
  3619                              <1> ;;;RES_FL: ;MOV	SI,OFFSET F1781 	; INDICATE DISK 1 FAILURE;
  3620                              <1> ;;	;TEST	DL,1
  3621                              <1> ;;	;JNZ	RES_E1
  3622                              <1> ;;	;MOV	SI,OFFSET F1780 	; INDICATE DISK 0 FAILURE
  3623                              <1> ;;	;CALL	SET_FAIL		; DO NOT TRY TO IPL DISK 0
  3624                              <1> ;;	;JMP	SHORT RES_E1
  3625                              <1> ;;RES_ER: ; 22/12/2014
  3626                              <1> ;;RES_OK:
  3627                              <1> ;;	;POP	CX			; RESTORE TIMER LIMITS
  3628                              <1> ;;	;POP	BX
  3629                              <1> ;;	RETn
  3630                              <1> ;;
  3631                              <1> ;;RES_RS: MOV	AH,00H			; RESET THE DRIVE
  3632                              <1> ;;	INT	13H
  3633                              <1> ;;RES_CK: MOV	AH,08H			; GET MAX CYLINDER,HEAD,SECTOR
  3634                              <1> ;;	MOV	BL,DL			; SAVE DRIVE CODE
  3635                              <1> ;;	INT	13H
  3636                              <1> ;;	JC	short RES_ER
  3637                              <1> ;;	MOV	[NEC_STATUS],CX 	; SAVE MAX CYLINDER, SECTOR
  3638                              <1> ;;	MOV	DL,BL			; RESTORE DRIVE CODE
  3639                              <1> ;;RES_3: MOV	AX,0401H		; VERIFY THE LAST SECTOR
  3640                              <1> ;;	INT	13H
  3641                              <1> ;;	JNC	short RES_OK		; VERIFY OK
  3642                              <1> ;;	CMP	AH,BAD_SECTOR		; OK ALSO IF JUST ID READ
  3643                              <1> ;;	JE	short RES_OK
  3644                              <1> ;;	CMP	AH,DATA_CORRECTED
  3645                              <1> ;;	JE	short RES_OK
  3646                              <1> ;;	CMP	AH,BAD_ECC
  3647                              <1> ;;	JE	short RES_OK
  3648                              <1> ;;	;CALL	POD_TCHK		; CHECK FOR TIME OUT
  3649                              <1> ;;	cmp	word [wait_count], 6*182 ; waiting time (in timer ticks)
  3650                              <1> ;;					; (60 seconds)		
  3651                              <1> ;;	cmc
  3652                              <1> ;;	JC	short RES_ER		; FAILED
  3653                              <1> ;;	MOV	CX,[NEC_STATUS] 	; GET SECTOR ADDRESS, AND CYLINDER
  3654                              <1> ;;	MOV	AL,CL			; SEPARATE OUT SECTOR NUMBER
  3655                              <1> ;;	AND	AL,3FH
  3656                              <1> ;;	DEC	AL			; TRY PREVIOUS ONE
  3657                              <1> ;;	JZ	short RES_RS		; WE'VE TRIED ALL SECTORS ON TRACK
  3658                              <1> ;;	AND	CL,0C0H 		; KEEP CYLINDER BITS
  3659                              <1> ;;	OR	CL,AL			; MERGE SECTOR WITH CYLINDER BITS
  3660                              <1> ;;	MOV	[NEC_STATUS],CX 	; SAVE CYLINDER, NEW SECTOR NUMBER
  3661                              <1> ;;	JMP	short RES_3		; TRY AGAIN
  3662                              <1> ;;;RES_ER: MOV	SI,OFFSET F1791 	; INDICATE DISK 1 ERROR
  3663                              <1> ;;	;TEST	DL,1
  3664                              <1> ;;	;JNZ	short RES_E1
  3665                              <1> ;;	;MOV	SI,OFFSET F1790 	; INDICATE DISK 0 ERROR
  3666                              <1> ;;;RES_E1:
  3667                              <1> ;;	;CALL	E_MSG			; DISPLAY ERROR AND SET (BP) ERROR FLAG
  3668                              <1> ;;;RES_OK:
  3669                              <1> ;;	;POP	CX			; RESTORE TIMER LIMITS
  3670                              <1> ;;	;POP	BX
  3671                              <1> ;;	;RETn
  3672                              <1> ;
  3673                              <1> ;;SET_FAIL:
  3674                              <1> ;	;MOV	AX,X*(CMOS_DIAG+NMI)	; GET CMOS ERROR BYTE
  3675                              <1> ;	;CALL	CMOS_READ
  3676                              <1> ;	;OR	AL,HF_FAIL		; SET DO NOT IPL FROM DISK FLAG
  3677                              <1> ;	;XCHG	AH,AL			; SAVE IT
  3678                              <1> ;	;CALL	CMOS_WRITE		; PUT IT OUT
  3679                              <1> ;	;RETn
  3680                              <1> ;
  3681                              <1> ;;POD_TCHK:				; CHECK FOR 30 SECOND TIME OUT
  3682                              <1> ;	;POP	AX			; SAVE RETURN
  3683                              <1> ;	;POP	CX			; GET TIME OUT LIMITS
  3684                              <1> ;	;POP	BX
  3685                              <1> ;	;PUSH	BX			; AND SAVE THEM AGAIN
  3686                              <1> ;	;PUSH	CX
  3687                              <1> ;	;PUSH	AX
  3688                              <1> ;	;push	ds
  3689                              <1> ;	;xor	ax, ax
  3690                              <1> ;	;mov	ds, ax			; RESTORE RETURN
  3691                              <1> ;	;MOV	AX, [TIMER_LOW]		; AX = CURRENT TIME
  3692                              <1> ;	;				; BX = START TIME
  3693                              <1> ;	;				; CX = END TIME
  3694                              <1> ;	;pop	ds
  3695                              <1> ;	;CMP	BX,CX
  3696                              <1> ;	;JB	short TCHK1		; START < END
  3697                              <1> ;	;CMP	BX,AX
  3698                              <1> ;	;JB	short TCHKG		; END < START < CURRENT
  3699                              <1> ;	;JMP	SHORT TCHK2		; END, CURRENT < START
  3700                              <1> ;;TCHK1: CMP	AX,BX
  3701                              <1> ;;	JB	short TCHKNG		; CURRENT < START < END
  3702                              <1> ;;TCHK2: CMP	AX,CX
  3703                              <1> ;;	JB	short TCHKG		; START < CURRENT < END
  3704                              <1> ;;					; OR CURRENT < END < START
  3705                              <1> ;;TCHKNG: STC				; CARRY SET INDICATES TIME OUT
  3706                              <1> ;;	RETn
  3707                              <1> ;;TCHKG: CLC				; INDICATE STILL TIME
  3708                              <1> ;;	RETn
  3709                              <1> ;;
  3710                              <1> ;;int_13h:
  3711                              <1> 
  3712                              <1> ;----------------------------------------
  3713                              <1> ;	FIXED DISK BIOS ENTRY POINT	:
  3714                              <1> ;----------------------------------------
  3715                              <1> 
  3716                              <1> ; 30/08/2020
  3717                              <1> ; 29/08/2020
  3718                              <1> ; 15/01/2017
  3719                              <1> ; 14/01/2017
  3720                              <1> ; 07/01/2017
  3721                              <1> ; 02/01/2017
  3722                              <1> ; 01/06/2016
  3723                              <1> ; 16/05/2016, 27/05/2016, 28/05/2016, 29/05/2016
  3724                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  3725                              <1> int33h:  ; DISK I/O
  3726                              <1> 	; 29/05/2016
  3727 0000428E 80642408FE          <1> 	and	byte [esp+8], 11111110b  ; clear carry bit of eflags register
  3728                              <1> 	; 16/05/2016
  3729 00004293 1E                  <1> 	push	ds
  3730 00004294 53                  <1> 	push	ebx ; user's buffer address (virtual)
  3731 00004295 66BB1000            <1> 	mov	bx, KDATA ; System (Kernel's) data segment
  3732 00004299 8EDB                <1> 	mov	ds, bx
  3733                              <1> 
  3734                              <1> 	;;15/01/2017
  3735                              <1> 	; 14/01/2017
  3736                              <1> 	; 02/01/2017
  3737                              <1> 	;;mov	byte [intflg], 33h	; disk io interrupt 
  3738                              <1> 	;pop	ebx
  3739                              <1> 	;mov	[user_buffer], ebx		
  3740                              <1> 
  3741 0000429B 8F05[4C650100]      <1> 	pop	dword [user_buffer] ; 01/06/2016
  3742                              <1> 
  3743 000042A1 C605[865E0100]00    <1> 	mov	byte [scount], 0 ; sector count for transfer
  3744 000042A8 80FC03              <1> 	cmp	ah, 03h ; chs write
  3745 000042AB 7744                <1> 	ja	short int33h_2
  3746 000042AD 7407                <1> 	je	short int33h_0
  3747 000042AF 80FC02              <1> 	cmp	ah, 02h ; chs read
  3748 000042B2 726F                <1> 	jb	short int33h_5
  3749 000042B4 EB68                <1> 	jmp	short int33h_4
  3750                              <1> int33h_0:
  3751                              <1> 	; transfer user's buffer content to sector buffer
  3752 000042B6 51                  <1> 	push	ecx
  3753 000042B7 0FB6C8              <1> 	movzx	ecx, al
  3754                              <1> int33h_1:
  3755 000042BA 56                  <1> 	push	esi
  3756 000042BB 8B35[4C650100]      <1> 	mov	esi, [user_buffer]
  3757                              <1> 	; esi = user's buffer address (virtual, ebx)
  3758 000042C1 57                  <1> 	push	edi
  3759 000042C2 06                  <1> 	push	es
  3760 000042C3 50                  <1> 	push	eax
  3761 000042C4 66B81000            <1> 	mov	ax, KDATA
  3762 000042C8 8EC0                <1> 	mov	es, ax
  3763 000042CA BF00000700          <1> 	mov	edi, Cluster_Buffer
  3764 000042CF C1E109              <1> 	shl	ecx, 9 ; * 512
  3765 000042D2 E870A50000          <1> 	call	transfer_from_user_buffer
  3766 000042D7 58                  <1> 	pop	eax
  3767 000042D8 07                  <1> 	pop	es
  3768 000042D9 5F                  <1> 	pop	edi
  3769 000042DA 5E                  <1> 	pop	esi
  3770 000042DB 59                  <1> 	pop	ecx
  3771 000042DC 7345                <1> 	jnc	short int33h_5
  3772 000042DE 8B1D[4C650100]      <1> 	mov	ebx, [user_buffer] ; 01/06/2016
  3773 000042E4 1F                  <1> 	pop	ds
  3774                              <1> 
  3775                              <1> 	;;15/01/2017
  3776                              <1> 	; 02/01/2017
  3777                              <1> 	;cli
  3778                              <1> 	;;mov	byte [ss:intflg], 0 ; 07/01/2017
  3779                              <1> 	;
  3780                              <1> 	; (*) 29/05/2016
  3781                              <1> 	; (*) retf 4 ; skip eflags on stack
  3782                              <1> 
  3783                              <1> 	; 29/05/2016 -set carry flag on stack-
  3784                              <1> 	; [esp] = EIP
  3785                              <1> 	; [esp+4] = CS
  3786                              <1> 	; [esp+8] = E-FLAGS
  3787 000042E5 804C240801          <1> 	or	byte [esp+8], 1  ; set carry bit of eflags register
  3788                              <1> 	; [esp+12] = ESP (user)
  3789                              <1> 	; [esp+16] = SS (User)
  3790 000042EA B8FF000000          <1> 	mov	eax, 0FFh ; Unknown error !?
  3791                              <1> 	;iretd
  3792 000042EF EB7E                <1> 	jmp	short int33h_7  ; 07/01/2017	
  3793                              <1> 
  3794                              <1> 	; (*) 29/05/2016 - 'ref 4' intruction causes to stack fault
  3795                              <1> 	; (OUTER-PRIVILEGE-LEVEL)
  3796                              <1> 	; INTEL 80386 PROGRAMMER'S REFERENCE MANUAL 1986
  3797                              <1> 	; // RETF instruction:
  3798                              <1> 	;
  3799                              <1> 	; IF OperandMode=32 THEN
  3800                              <1>  	;    Load CS:EIP from stack;
  3801                              <1>  	;    Set CS RPL to CPL;
  3802                              <1>  	;    Increment eSP by 8 plus the immediate offset if it exists;
  3803                              <1>  	;    Load SS:eSP from stack;
  3804                              <1>  	; ELSE (* OperandMode=16 *)
  3805                              <1>  	;    Load CS:IP from stack;
  3806                              <1>  	;    Set CS RPL to CPL;
  3807                              <1>  	;    Increment eSP by 4 plus the immediate offset if it exists;
  3808                              <1> 	;    Load SS:eSP from stack;
  3809                              <1>  	; FI;
  3810                              <1> 	;
  3811                              <1> 	; //
  3812                              <1> 
  3813                              <1> int33h_2:
  3814 000042F1 80FC05              <1> 	cmp	ah, 05h ; format track
  3815 000042F4 770A                <1> 	ja	short int33h_3
  3816 000042F6 722B                <1> 	jb	short int33h_5
  3817 000042F8 51                  <1> 	push	ecx
  3818 000042F9 B901000000          <1> 	mov	ecx, 1
  3819 000042FE EBBA                <1> 	jmp	short int33h_1
  3820                              <1> int33h_3:
  3821 00004300 80FC1C              <1> 	cmp	ah, 1Ch ; LBA write
  3822 00004303 771E                <1> 	ja	short int33h_5
  3823 00004305 74AF                <1> 	je	short int33h_0
  3824 00004307 80FC1B              <1> 	cmp	ah, 1Bh ; LBA read
  3825 0000430A 7412                <1> 	je	short int33h_4
  3826                              <1> 	; 29/08/2020
  3827 0000430C 80FC08              <1> 	cmp	ah, 08h ; get disk parameters
  3828                              <1> 	;jne	short int33h_5
  3829 0000430F 7405                <1> 	je	short int33h_10
  3830 00004311 80FC15              <1> 	cmp	ah, 15h	; read DASD type (get disk size)
  3831 00004314 750D                <1> 	jne	short int33h_5
  3832                              <1> int33h_10:
  3833                              <1> 	; 01/06/2016
  3834 00004316 8B1D[4C650100]      <1> 	mov	ebx, [user_buffer] ; user's buffer address
  3835 0000431C EB0A                <1> 	jmp	short int33h_6
  3836                              <1> int33h_4:
  3837 0000431E A2[865E0100]        <1> 	mov	byte [scount], al ; <= 128 sectors
  3838                              <1> int33h_5:
  3839 00004323 BB00000700          <1> 	mov	ebx, Cluster_Buffer ; max. 65536 bytes
  3840                              <1> 				    ; buf. addr: 70000h	
  3841                              <1> 	;mov	byte [ClusterBuffer_Valid], 0
  3842                              <1> int33h_6:
  3843 00004328 1F                  <1> 	pop	ds
  3844 00004329 9C                  <1> 	pushfd
  3845 0000432A 0E                  <1> 	push 	cs
  3846 0000432B E84D000000          <1> 	call 	DISK_IO
  3847 00004330 2E8B1D[4C650100]    <1> 	mov	ebx, [CS:user_buffer] ; 01/06/2016
  3848 00004337 723D                <1> 	jc	short int33h_9
  3849                              <1> 	;
  3850 00004339 2E803D[865E0100]00  <1> 	cmp	byte [CS:scount], 0
  3851 00004341 762C                <1> 	jna	short int33h_7
  3852                              <1> 	;
  3853                              <1> 	; transfer sector buffer content to user's buffer
  3854 00004343 06                  <1> 	push	es
  3855 00004344 1E                  <1> 	push	ds
  3856 00004345 50                  <1> 	push	eax
  3857 00004346 66B81000            <1> 	mov	ax, KDATA
  3858 0000434A 8ED8                <1> 	mov	ds, ax
  3859 0000434C 8EC0                <1> 	mov	es, ax
  3860 0000434E 51                  <1> 	push	ecx
  3861 0000434F 56                  <1> 	push	esi
  3862 00004350 57                  <1> 	push	edi
  3863 00004351 0FB60D[865E0100]    <1> 	movzx	ecx, byte [scount]
  3864 00004358 C1E109              <1> 	shl	ecx, 9 ; * 512 bytes
  3865 0000435B 89DF                <1> 	mov	edi, ebx ; user's buffer address
  3866 0000435D BE00000700          <1> 	mov	esi, Cluster_Buffer
  3867 00004362 E896A40000          <1> 	call	transfer_to_user_buffer
  3868 00004367 5F                  <1> 	pop	edi
  3869 00004368 5E                  <1> 	pop	esi
  3870 00004369 59                  <1> 	pop	ecx
  3871 0000436A 58                  <1> 	pop	eax
  3872 0000436B 1F                  <1> 	pop	ds
  3873 0000436C 07                  <1> 	pop	es
  3874 0000436D 7202                <1> 	jc	short int33h_8
  3875                              <1> int33h_7:
  3876 0000436F FA                  <1> 	cli
  3877                              <1> 	;;15/01/2017
  3878                              <1> 	;;mov	byte [ss:intflg], 0 ; 07/01/2017
  3879                              <1> 	; cf = 0  ; use eflags which is in stack
  3880 00004370 CF                  <1> 	iretd	
  3881                              <1> int33h_8:
  3882 00004371 B8FF000000          <1> 	mov	eax, 0FFh ; Unknown error !?
  3883                              <1> int33h_9:
  3884                              <1> 	; cf = 1
  3885                              <1> 
  3886                              <1> 	; (*) 29/05/2016	
  3887                              <1> 	; (*) retf 4 ; skip eflags on stack
  3888                              <1> 	; Note: This 'retf 4' was wrong, -it was causing
  3889                              <1> 	;       to stack errors in ring 3-
  3890                              <1> 	;	POP sequence of 'retf 4' is as
  3891                              <1> 	;       "eip, cs, eflags, esp, ss, +4 bytes" 
  3892                              <1>         ;       it is not as "eip, cs, +4 bytes, esp, ss" ! 
  3893                              <1> 
  3894                              <1> 	; 29/05/2016 -set carry flag on stack-
  3895 00004376 804C240801          <1> 	or	byte [esp+8], 1  ; set carry bit of eflags register
  3896                              <1> 	;iretd
  3897 0000437B EBF2                <1> 	jmp	short int33h_7 ; 07/01/2017
  3898                              <1> 
  3899                              <1> ; 30/08/2020
  3900                              <1> ; 09/12/2017
  3901                              <1> ; 29/05/2016
  3902                              <1> ; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
  3903                              <1> 
  3904                              <1> DISK_IO:
  3905 0000437D 80FA80              <1> 	CMP	DL,80H			; TEST FOR FIXED DISK DRIVE
  3906                              <1> 	;JAE	short A1		; YES, HANDLE HERE
  3907                              <1> 	;;;INT	40H			; DISKETTE HANDLER
  3908                              <1> 	;;call	int40h
  3909 00004380 0F82FFEFFFFF        <1> 	jb	DISKETTE_IO_1
  3910                              <1> ;RET_2:
  3911                              <1> 	;RETf	2			; BACK TO CALLER
  3912                              <1> ;	retf	4
  3913                              <1> A1:
  3914 00004386 FB                  <1> 	STI				; ENABLE INTERRUPTS
  3915                              <1> 	;; 04/01/2015
  3916                              <1> 	;;OR	AH,AH
  3917                              <1> 	;;JNZ	short A2
  3918                              <1> 	;;INT	40H			; RESET NEC WHEN AH=0
  3919                              <1> 	;;SUB	AH,AH
  3920 00004387 80FA83              <1> 	CMP	DL,(80H + S_MAX_FILE - 1) ; 83h ; 30/08/2020 
  3921                              <1> 	;JA	short RET_2
  3922 0000438A 7614                <1> 	jna	short _A0
  3923                              <1> 	; 29/05/2016
  3924 0000438C 1E                  <1> 	push	ds
  3925 0000438D 50                  <1> 	push	eax ; 30/08/2020 (ax --> eax)
  3926 0000438E 66B81000            <1> 	mov	ax, KDATA
  3927 00004392 8ED8                <1> 	mov	ds, ax
  3928 00004394 58                  <1> 	pop	eax ; 
  3929 00004395 B4AA                <1>         mov     ah, 0AAh        ; Hard disk drive not ready !
  3930                              <1> 				; (Programmer's guide to AMIBIOS, 1992)
  3931 00004397 8825[5B590100]      <1> 	mov     byte [DISK_STATUS1], ah
  3932 0000439D 1F                  <1> 	pop	ds
  3933 0000439E EB38                <1> 	jmp	short RET_2
  3934                              <1> _A0:
  3935                              <1> 	; 18/01/2015
  3936 000043A0 08E4                <1> 	or	ah,ah
  3937 000043A2 743A                <1> 	jz	short A4
  3938 000043A4 80FC0D              <1> 	cmp	ah,0Dh	; Alternate reset
  3939 000043A7 7504                <1> 	jne	short A2
  3940 000043A9 28E4                <1> 	sub	ah,ah	; Reset
  3941 000043AB EB31                <1> 	jmp	short A4
  3942                              <1> A2:
  3943 000043AD 80FC08              <1> 	CMP	AH,08H			; GET PARAMETERS IS A SPECIAL CASE
  3944                              <1> 	;JNZ	short A3
  3945                              <1>         ;JMP    GET_PARM_N
  3946 000043B0 0F8452030000        <1> 	je	GET_PARM_N
  3947 000043B6 80FC15              <1> A3:	CMP	AH,15H			; READ DASD TYPE IS ALSO
  3948                              <1> 	;JNZ	short A4
  3949                              <1>         ;JMP    READ_DASD_TYPE
  3950 000043B9 0F84DB020000        <1>         je      READ_DASD_TYPE
  3951                              <1> 	; 02/02/2015
  3952 000043BF 80FC1D              <1> 	cmp	ah, 1Dh			;(Temporary for Retro UNIX 386 v1)
  3953                              <1> 	; 12/01/2015
  3954 000043C2 F5                  <1> 	cmc
  3955 000043C3 7319                <1> 	jnc	short A4
  3956                              <1> int33h_bad_cmd:
  3957                              <1> 	; 16/05/2016
  3958                              <1> 	; 30/01/2015
  3959                              <1> 	; 29/05/2016
  3960 000043C5 1E                  <1> 	push	ds
  3961 000043C6 6650                <1> 	push	ax
  3962 000043C8 66B81000            <1> 	mov	ax, KDATA
  3963 000043CC 8ED8                <1> 	mov	ds, ax
  3964 000043CE 6658                <1> 	pop	ax
  3965 000043D0 B401                <1> 	mov	ah, BAD_CMD
  3966 000043D2 8825[5B590100]      <1> 	mov     [DISK_STATUS1], ah ; BAD_CMD  ; COMMAND ERROR
  3967                              <1>         ;jmp	short RET_2
  3968                              <1> RET_2:
  3969                              <1> 	; (*) 29/05/2016
  3970                              <1> 	; (*) retf 4
  3971 000043D8 804C240801          <1> 	or	byte [esp+8], 1 ; set carry bit of eflags register
  3972 000043DD CF                  <1> 	iretd
  3973                              <1> A4:					; SAVE REGISTERS DURING OPERATION
  3974 000043DE C8080000            <1> 	ENTER	8,0			; SAVE (BP) AND MAKE ROOM FOR @CMD_BLOCK
  3975 000043E2 53                  <1> 	PUSH	eBX			;  IN THE STACK, THE COMMAND BLOCK IS:
  3976 000043E3 51                  <1> 	PUSH	eCX			;   @CMD_BLOCK == BYTE PTR [BP]-8
  3977 000043E4 52                  <1> 	PUSH	eDX
  3978 000043E5 1E                  <1> 	PUSH	DS
  3979 000043E6 06                  <1> 	PUSH	ES
  3980 000043E7 56                  <1> 	PUSH	eSI
  3981 000043E8 57                  <1> 	PUSH	eDI
  3982                              <1> 	;;04/01/2015
  3983                              <1> 	;;OR	AH,AH			; CHECK FOR RESET
  3984                              <1> 	;;JNZ	short A5
  3985                              <1> 	;;MOV	DL,80H			; FORCE DRIVE 80 FOR RESET
  3986                              <1> ;;A5:	
  3987                              <1> 	;push	cs
  3988                              <1> 	;pop	ds
  3989                              <1> 	; 21/02/2015
  3990 000043E9 6650                <1> 	push	ax
  3991 000043EB 66B81000            <1> 	mov	ax, KDATA
  3992 000043EF 8ED8                <1> 	mov	ds, ax
  3993 000043F1 8EC0                <1> 	mov	es, ax	
  3994 000043F3 6658                <1> 	pop	ax
  3995 000043F5 E88D000000          <1> 	CALL	DISK_IO_CONT		; PERFORM THE OPERATION
  3996                              <1> 	;;CALL	DDS			; ESTABLISH SEGMENT
  3997 000043FA 8A25[5B590100]      <1> 	MOV	AH,[DISK_STATUS1]	; GET STATUS FROM OPERATION
  3998                              <1> 	;(*) CMP AH,1			; SET THE CARRY FLAG TO INDICATE
  3999                              <1> 	;(*) CMC			; SUCCESS OR FAILURE
  4000 00004400 5F                  <1> 	POP	eDI			; RESTORE REGISTERS
  4001 00004401 5E                  <1> 	POP	eSI
  4002 00004402 07                  <1>         POP     ES
  4003 00004403 1F                  <1>         POP     DS
  4004 00004404 5A                  <1> 	POP	eDX
  4005 00004405 59                  <1> 	POP	eCX
  4006 00004406 5B                  <1> 	POP	eBX
  4007 00004407 C9                  <1> 	LEAVE				; ADJUST (SP) AND RESTORE (BP)
  4008                              <1> 	;RETf	2			; THROW AWAY SAVED FLAGS
  4009                              <1> 	; (*) 29/05/2016
  4010                              <1> 	; (*) retf 4
  4011 00004408 80FC01              <1> 	cmp	ah, 1
  4012 0000440B 7205                <1> 	jc	short _A5 
  4013 0000440D 804C240801          <1> 	or	byte [esp+8], 1 ; set carry bit of eflags register
  4014                              <1> _A5:
  4015 00004412 CF                  <1> 	iretd
  4016                              <1> 
  4017                              <1> ; 21/02/2015
  4018                              <1> ;       dw --> dd
  4019                              <1> D1:					; FUNCTION TRANSFER TABLE
  4020 00004413 [D6450000]          <1> 	dd	DISK_RESET		; 000H
  4021 00004417 [4D460000]          <1> 	dd	RETURN_STATUS		; 001H
  4022 0000441B [5A460000]          <1> 	dd	DISK_READ		; 002H
  4023 0000441F [63460000]          <1> 	dd	DISK_WRITE		; 003H
  4024 00004423 [6C460000]          <1> 	dd	DISK_VERF		; 004H
  4025 00004427 [84460000]          <1> 	dd	FMT_TRK 		; 005H
  4026 0000442B [CC450000]          <1> 	dd	BAD_COMMAND		; 006H	FORMAT BAD SECTORS
  4027 0000442F [CC450000]          <1> 	dd	BAD_COMMAND		; 007H	FORMAT DRIVE
  4028 00004433 [CC450000]          <1> 	dd	BAD_COMMAND		; 008H	RETURN PARAMETERS
  4029 00004437 [A1470000]          <1> 	dd	INIT_DRV		; 009H
  4030 0000443B [00480000]          <1> 	dd	RD_LONG 		; 00AH
  4031 0000443F [09480000]          <1> 	dd	WR_LONG 		; 00BH
  4032 00004443 [12480000]          <1> 	dd	DISK_SEEK		; 00CH
  4033 00004447 [D6450000]          <1> 	dd	DISK_RESET		; 00DH
  4034 0000444B [CC450000]          <1> 	dd	BAD_COMMAND		; 00EH	READ BUFFER
  4035 0000444F [CC450000]          <1> 	dd	BAD_COMMAND		; 00FH	WRITE BUFFER
  4036 00004453 [3A480000]          <1> 	dd	TST_RDY 		; 010H
  4037 00004457 [5E480000]          <1> 	dd	HDISK_RECAL		; 011H
  4038 0000445B [CC450000]          <1> 	dd	BAD_COMMAND		; 012H	MEMORY DIAGNOSTIC
  4039 0000445F [CC450000]          <1> 	dd	BAD_COMMAND		; 013H	DRIVE DIAGNOSTIC
  4040 00004463 [94480000]          <1> 	dd	CTLR_DIAGNOSTIC 	; 014H	CONTROLLER DIAGNOSTIC
  4041                              <1> 	; 02/02/2015 (Temporary - Retro UNIX 386 v1 - DISK I/O test)
  4042 00004467 [CC450000]          <1> 	dd	BAD_COMMAND		; 015h
  4043 0000446B [CC450000]          <1> 	dd	BAD_COMMAND		; 016h
  4044 0000446F [CC450000]          <1> 	dd	BAD_COMMAND		; 017h
  4045 00004473 [CC450000]          <1> 	dd	BAD_COMMAND		; 018h
  4046 00004477 [CC450000]          <1> 	dd	BAD_COMMAND		; 019h
  4047 0000447B [CC450000]          <1> 	dd	BAD_COMMAND		; 01Ah
  4048 0000447F [5A460000]          <1> 	dd	DISK_READ		; 01Bh ; LBA read
  4049 00004483 [63460000]          <1> 	dd	DISK_WRITE		; 01Ch ; LBA write
  4050                              <1> D1L     EQU    $ - D1
  4051                              <1> 
  4052                              <1> DISK_IO_CONT:
  4053                              <1> 	;;CALL	DDS			; ESTABLISH SEGMENT
  4054 00004487 80FC01              <1> 	CMP	AH,01H			; RETURN STATUS
  4055                              <1> 	;;JNZ	short SU0
  4056                              <1>         ;;JMP	RETURN_STATUS
  4057 0000448A 0F84BD010000        <1> 	je	RETURN_STATUS
  4058                              <1> SU0:
  4059 00004490 C605[5B590100]00    <1> 	MOV	byte [DISK_STATUS1],0 	; RESET THE STATUS INDICATOR
  4060                              <1> 	;;PUSH	BX			; SAVE DATA ADDRESS
  4061                              <1> 	;mov	si, bx ;; 14/02/2015
  4062 00004497 89DE                <1> 	mov	esi, ebx ; 21/02/2015
  4063 00004499 8A1D[5C590100]      <1> 	MOV	BL,[HF_NUM]		; GET NUMBER OF DRIVES
  4064                              <1> 	;; 04/01/2015
  4065                              <1> 	;;PUSH	AX
  4066 0000449F 80E27F              <1> 	AND	DL,7FH			; GET DRIVE AS 0 OR 1
  4067                              <1> 					; (get drive number as 0 to 3)
  4068 000044A2 38D3                <1> 	CMP	BL,DL
  4069                              <1>         ;;JBE   BAD_COMMAND_POP         ; INVALID DRIVE
  4070 000044A4 0F8622010000        <1>         jbe     BAD_COMMAND ;; 14/02/2015
  4071                              <1>         ;
  4072                              <1> 	;;03/01/2015
  4073 000044AA 29DB                <1> 	sub	ebx, ebx
  4074 000044AC 88D3                <1> 	mov	bl, dl
  4075                              <1> 	;sub	bh, bh
  4076 000044AE 883D[70590100]      <1> 	mov	[LBAMode], bh 	; 0
  4077                              <1> 	;;test	byte [bx+hd0_type], 1	; LBA ready ?
  4078                              <1> 	;test	byte [ebx+hd0_type], 1
  4079                              <1> 	;jz	short su1		; no
  4080                              <1> 	;inc	byte [LBAMode]
  4081                              <1> ;su1:
  4082                              <1> 	; 21/02/2015 (32 bit modification)
  4083                              <1> 	;04/01/2015
  4084 000044B4 6650                <1> 	push	ax ; ***
  4085                              <1> 	;PUSH	ES ; **
  4086 000044B6 6652                <1> 	PUSH	DX ; *
  4087 000044B8 6650                <1> 	push	ax
  4088 000044BA E8BB060000          <1> 	CALL	GET_VEC 		; GET DISK PARAMETERS
  4089                              <1> 	; 02/02/2015
  4090                              <1> 	;mov	ax, [ES:BX+16] ; I/O port base address (1F0h, 170h)
  4091 000044BF 668B4310            <1> 	mov	ax, [ebx+16]
  4092 000044C3 66A3[485D0000]      <1> 	mov	[HF_PORT], ax
  4093                              <1> 	;mov	dx, [ES:BX+18] ; control port address (3F6h, 376h)
  4094 000044C9 668B5312            <1> 	mov	dx, [ebx+18]
  4095 000044CD 668915[4A5D0000]    <1> 	mov	[HF_REG_PORT], dx
  4096                              <1> 	;mov	al, [ES:BX+20] ; head register upper nibble (A0h,B0h,E0h,F0h)
  4097 000044D4 8A4314              <1> 	mov	al, [ebx+20]
  4098                              <1> 	; 23/02/2015
  4099 000044D7 A840                <1> 	test	al, 40h	 ; LBA bit (bit 6)
  4100 000044D9 7406                <1> 	jz 	short su1
  4101 000044DB FE05[70590100]      <1> 	inc	byte [LBAMode] ; 1 
  4102                              <1> su1: 	 
  4103 000044E1 C0E804              <1> 	shr 	al, 4
  4104 000044E4 2401                <1> 	and	al, 1			
  4105 000044E6 A2[4C5D0000]        <1> 	mov	[hf_m_s], al 
  4106                              <1> 	;
  4107                              <1> 	; 03/01/2015
  4108                              <1> 	;MOV	AL,byte [ES:BX+8]	; GET CONTROL BYTE MODIFIER
  4109 000044EB 8A4308              <1> 	mov	al, [ebx+8]
  4110                              <1> 	;MOV	DX,[HF_REG_PORT]	; Device Control register	
  4111 000044EE EE                  <1> 	OUT	DX,AL			; SET EXTRA HEAD OPTION
  4112                              <1> 					; Control Byte:  (= 08h, here)
  4113                              <1> 					; bit 0 - 0
  4114                              <1> 					; bit 1 - nIEN (1 = disable irq)
  4115                              <1> 					; bit 2 - SRST (software RESET)
  4116                              <1> 					; bit 3 - use extra heads (8 to 15)
  4117                              <1> 					;         -always set to 1-	
  4118                              <1> 					; (bits 3 to 7 are reserved
  4119                              <1> 					;          for ATA devices)
  4120 000044EF 8A25[5D590100]      <1> 	MOV	AH,[CONTROL_BYTE]	; SET EXTRA HEAD OPTION IN
  4121 000044F5 80E4C0              <1> 	AND	AH,0C0H 		; CONTROL BYTE
  4122 000044F8 08C4                <1> 	OR	AH,AL
  4123 000044FA 8825[5D590100]      <1> 	MOV	[CONTROL_BYTE],AH	
  4124                              <1> 	; 04/01/2015
  4125 00004500 6658                <1> 	pop	ax
  4126 00004502 665A                <1> 	pop	dx ; * ;; 14/02/2015
  4127 00004504 20E4                <1> 	and	ah, ah	; Reset function ?
  4128 00004506 7507                <1> 	jnz	short su2
  4129                              <1> 	;;pop	dx ; * ;; 14/02/2015
  4130                              <1> 	;pop	es ; **
  4131 00004508 6658                <1> 	pop	ax ; ***
  4132                              <1> 	;;pop	bx
  4133 0000450A E9C7000000          <1>         jmp     DISK_RESET
  4134                              <1> su2:
  4135 0000450F 803D[70590100]00    <1> 	cmp	byte [LBAMode], 0
  4136 00004516 7662                <1> 	jna	short su3
  4137                              <1> 	;
  4138                              <1> 	; 02/02/2015 (LBA read/write function calls)
  4139 00004518 80FC1B              <1> 	cmp	ah, 1Bh
  4140 0000451B 720B                <1> 	jb	short lbarw1
  4141 0000451D 80FC1C              <1> 	cmp	ah, 1Ch
  4142 00004520 775D                <1> 	ja 	short invldfnc
  4143                              <1> 	;;pop	dx ; * ; 14/02/2015
  4144                              <1> 	;mov	ax, cx ; Lower word of LBA address (bits 0-15)
  4145 00004522 89C8                <1> 	mov	eax, ecx ; LBA address (21/02/2015)
  4146                              <1> 	;; 14/02/2015
  4147 00004524 88D1                <1> 	mov	cl, dl ; 14/02/2015
  4148                              <1> 	;;mov	dx, bx
  4149                              <1> 	;mov	dx, si ; higher word of LBA address (bits 16-23)
  4150                              <1> 	;;mov	bx, di
  4151                              <1> 	;mov	si, di ; Buffer offset
  4152 00004526 EB32                <1> 	jmp	short lbarw2
  4153                              <1> lbarw1:
  4154                              <1> 	; convert CHS to LBA
  4155                              <1> 	;
  4156                              <1> 	; LBA calculation - AWARD BIOS - 1999 - AHDSK.ASM
  4157                              <1> 	; LBA = "# of Heads" * Sectors/Track * Cylinder + Head * Sectors/Track
  4158                              <1> 	;	+ Sector - 1
  4159 00004528 6652                <1> 	push	dx ; * ;; 14/02/2015
  4160                              <1> 	;xor	dh, dh
  4161 0000452A 31D2                <1> 	xor	edx, edx
  4162                              <1> 	;mov	dl, [ES:BX+14]	; sectors per track (logical)
  4163 0000452C 8A530E              <1> 	mov	dl, [ebx+14]
  4164                              <1> 	;xor	ah, ah
  4165 0000452F 31C0                <1> 	xor	eax, eax
  4166                              <1> 	;mov	al, [ES:BX+2]	; heads (logical) 	
  4167 00004531 8A4302              <1> 	mov	al, [ebx+2]
  4168 00004534 FEC8                <1> 	dec	al
  4169 00004536 6640                <1> 	inc	ax		; 0 =  256
  4170 00004538 66F7E2              <1> 	mul 	dx
  4171                              <1> 		; AX = # of Heads" * Sectors/Track
  4172 0000453B 6689CA              <1> 	mov	dx, cx
  4173                              <1> 	;and	cx, 3Fh	 ; sector  (1 to 63)
  4174 0000453E 83E13F              <1> 	and	ecx, 3fh
  4175 00004541 86D6                <1> 	xchg	dl, dh
  4176 00004543 C0EE06              <1> 	shr	dh, 6
  4177                              <1> 		; DX = cylinder (0 to 1023)
  4178                              <1> 	;mul 	dx
  4179                              <1> 		; DX:AX = # of Heads" * Sectors/Track * Cylinder
  4180 00004546 F7E2                <1> 	mul	edx
  4181 00004548 FEC9                <1> 	dec	cl  ; sector - 1
  4182                              <1> 	;add	ax, cx
  4183                              <1> 	;adc	dx, 0
  4184                              <1> 		; DX:AX = # of Heads" * Sectors/Track * Cylinder + Sector -1
  4185 0000454A 01C8                <1> 	add	eax, ecx
  4186 0000454C 6659                <1> 	pop	cx ; * ; ch = head, cl = drive number (zero based)
  4187                              <1> 	;push	dx
  4188                              <1> 	;push	ax
  4189 0000454E 50                  <1> 	push	eax
  4190                              <1> 	;mov	al, [ES:BX+14]	; sectors per track (logical)	
  4191 0000454F 8A430E              <1> 	mov	al, [ebx+14]
  4192 00004552 F6E5                <1> 	mul	ch
  4193                              <1> 		;  AX = Head * Sectors/Track
  4194 00004554 0FB7C0              <1>         movzx	eax, ax ; 09/12/2017
  4195                              <1> 	;pop	dx
  4196 00004557 5A                  <1> 	pop	edx
  4197                              <1> 	;add	ax, dx
  4198                              <1> 	;pop	dx
  4199                              <1> 	;adc	dx, 0 ; add carry bit
  4200 00004558 01D0                <1> 	add	eax, edx
  4201                              <1> lbarw2:
  4202 0000455A 29D2                <1> 	sub	edx, edx ; 21/02/2015
  4203 0000455C 88CA                <1> 	mov	dl, cl ; 21/02/2015
  4204 0000455E C645F800            <1>         mov     byte [CMD_BLOCK], 0 ; Features Register
  4205                              <1> 				; NOTE: Features register (1F1h, 171h)
  4206                              <1> 				; is not used for ATA device R/W functions. 
  4207                              <1> 				; It is old/obsolete 'write precompensation'
  4208                              <1> 				; register and error register
  4209                              <1> 				; for old ATA/IDE devices.
  4210                              <1> 	; 18/01/2014
  4211                              <1> 	;mov	ch, [hf_m_s]	; Drive 0 (master) or 1 (slave)
  4212 00004562 8A0D[4C5D0000]      <1> 	mov	cl, [hf_m_s]
  4213                              <1> 	;shl	ch, 4		; bit 4 (drive bit)
  4214                              <1> 	;or	ch, 0E0h	; bit 5 = 1
  4215                              <1> 				; bit 6 = 1 = LBA mode
  4216                              <1> 				; bit 7 = 1
  4217 00004568 80C90E              <1> 	or	cl, 0Eh ; 1110b
  4218                              <1> 	;and	dh, 0Fh		; LBA byte 4 (bits 24 to 27)
  4219 0000456B 25FFFFFF0F          <1> 	and	eax, 0FFFFFFFh
  4220 00004570 C1E11C              <1> 	shl	ecx, 28 ; 21/02/2015
  4221                              <1> 	;or	dh, ch
  4222 00004573 09C8                <1> 	or	eax, ecx	
  4223                              <1> 	;;mov	[CMD_BLOCK+2], al ; LBA byte 1 (bits 0 to 7)
  4224                              <1> 				  ; (Sector Number Register)
  4225                              <1> 	;;mov	[CMD_BLOCK+3], ah ; LBA byte 2 (bits 8 to 15)
  4226                              <1> 				  ; (Cylinder Low Register)
  4227                              <1> 	;mov	[CMD_BLOCK+2], ax ; LBA byte 1, 2
  4228                              <1> 	;mov	[CMD_BLOCK+4], dl ; LBA byte 3 (bits 16 to 23)
  4229                              <1> 				  ; (Cylinder High Register)
  4230                              <1> 	;;mov	[CMD_BLOCK+5], dh ; LBA byte 4 (bits 24 to 27)
  4231                              <1> 				  ; (Drive/Head Register)
  4232                              <1> 	
  4233                              <1> 	;mov	[CMD_BLOCK+4], dx ; LBA byte 4, LBA & DEV select bits
  4234 00004575 8945FA              <1> 	mov	[CMD_BLOCK+2], eax ; 21/02/2015
  4235                              <1> 	;14/02/2015
  4236                              <1> 	;mov	dl, cl ; Drive number (INIT_DRV)		
  4237 00004578 EB38                <1> 	jmp	short su4
  4238                              <1> su3:
  4239                              <1> 	; 02/02/2015 
  4240                              <1> 	; (Temporary functions 1Bh & 1Ch are not valid for CHS mode) 
  4241 0000457A 80FC14              <1> 	cmp 	ah, 14h
  4242 0000457D 7604                <1> 	jna 	short chsfnc
  4243                              <1> invldfnc:
  4244                              <1>         ; 14/02/2015  
  4245                              <1> 	;pop	es ; **
  4246 0000457F 6658                <1>         pop     ax ; ***
  4247                              <1>         ;jmp     short BAD_COMMAND_POP
  4248 00004581 EB49                <1>         jmp     short BAD_COMMAND
  4249                              <1> chsfnc:	
  4250                              <1> 	;MOV	AX,[ES:BX+5]		; GET WRITE PRE-COMPENSATION CYLINDER
  4251 00004583 668B4305            <1> 	mov	ax, [ebx+5]
  4252 00004587 66C1E802            <1> 	SHR	AX,2
  4253 0000458B 8845F8              <1> 	MOV	[CMD_BLOCK],AL
  4254                              <1> 	;;MOV	AL,[ES:BX+8]		; GET CONTROL BYTE MODIFIER
  4255                              <1> 	;;PUSH	DX
  4256                              <1> 	;;MOV	DX,[HF_REG_PORT]
  4257                              <1> 	;;OUT	DX,AL			; SET EXTRA HEAD OPTION
  4258                              <1> 	;;POP	DX ; * 
  4259                              <1> 	;;POP	ES ; **
  4260                              <1> 	;;MOV	AH,[CONTROL_BYTE]	; SET EXTRA HEAD OPTION IN
  4261                              <1> 	;;AND	AH,0C0H 		; CONTROL BYTE	
  4262                              <1> 	;;OR	AH,AL
  4263                              <1> 	;;MOV	[CONTROL_BYTE],AH
  4264                              <1> 	;
  4265 0000458E 88C8                <1> 	MOV	AL,CL			; GET SECTOR NUMBER
  4266 00004590 243F                <1> 	AND	AL,3FH
  4267 00004592 8845FA              <1> 	MOV	[CMD_BLOCK+2],AL
  4268 00004595 886DFB              <1> 	MOV	[CMD_BLOCK+3],CH 	; GET CYLINDER NUMBER
  4269 00004598 88C8                <1> 	MOV	AL,CL
  4270 0000459A C0E806              <1> 	SHR	AL,6
  4271 0000459D 8845FC              <1> 	MOV	[CMD_BLOCK+4],AL 	; CYLINDER HIGH ORDER 2 BITS
  4272                              <1> 	;;05/01/2015
  4273                              <1> 	;;MOV	AL,DL			; DRIVE NUMBER
  4274 000045A0 A0[4C5D0000]        <1> 	mov	al, [hf_m_s]
  4275 000045A5 C0E004              <1> 	SHL	AL,4
  4276 000045A8 80E60F              <1> 	AND	DH,0FH			; HEAD NUMBER
  4277 000045AB 08F0                <1> 	OR	AL,DH
  4278                              <1> 	;OR	AL,80H or 20H
  4279 000045AD 0CA0                <1> 	OR	AL,80h+20h		; ECC AND 512 BYTE SECTORS
  4280 000045AF 8845FD              <1> 	MOV	[CMD_BLOCK+5],AL 	; ECC/SIZE/DRIVE/HEAD
  4281                              <1> su4:
  4282                              <1> 	;POP	ES ; **
  4283                              <1>         ;; 14/02/2015
  4284                              <1>         ;;POP   AX
  4285                              <1>         ;;MOV   [CMD_BLOCK+1],AL        ; SECTOR COUNT
  4286                              <1>         ;;PUSH  AX
  4287                              <1>         ;;MOV   AL,AH                   ; GET INTO LOW BYTE
  4288                              <1>         ;;XOR   AH,AH                   ; ZERO HIGH BYTE
  4289                              <1>         ;;SAL   AX,1                    ; *2 FOR TABLE LOOKUP
  4290 000045B2 6658                <1>         pop     ax ; ***
  4291 000045B4 8845F9              <1>         mov     [CMD_BLOCK+1], al
  4292 000045B7 29DB                <1>         sub	ebx, ebx
  4293 000045B9 88E3                <1> 	mov     bl, ah
  4294                              <1>         ;xor     bh, bh
  4295                              <1>         ;sal     bx, 1
  4296 000045BB 66C1E302            <1>         sal	bx, 2	; 32 bit offset (21/02/2015)
  4297                              <1> 	;;MOV   SI,AX                   ; PUT INTO SI FOR BRANCH
  4298                              <1>         ;;CMP   AX,D1L                  ; TEST WITHIN RANGE
  4299                              <1>         ;;JNB   short BAD_COMMAND_POP
  4300                              <1>         ;cmp     bx, D1L
  4301 000045BF 83FB74              <1> 	cmp	ebx, D1L
  4302 000045C2 7308                <1> 	jnb	short BAD_COMMAND
  4303                              <1>         ;xchg    bx, si
  4304 000045C4 87DE                <1>         xchg	ebx, esi
  4305                              <1> 	;;;POP	AX			; RESTORE AX
  4306                              <1> 	;;;POP	BX			; AND DATA ADDRESS
  4307                              <1> 	
  4308                              <1> 	;;PUSH	CX
  4309                              <1> 	;;PUSH	AX			; ADJUST ES:BX
  4310                              <1> 	;MOV	CX,BX			; GET 3 HIGH ORDER NIBBLES OF BX
  4311                              <1> 	;SHR	CX,4
  4312                              <1> 	;MOV	AX,ES
  4313                              <1> 	;ADD	AX,CX
  4314                              <1> 	;MOV	ES,AX
  4315                              <1> 	;AND	BX,000FH		; ES:BX CHANGED TO ES:000X
  4316                              <1> 	;;POP	AX
  4317                              <1> 	;;POP	CX
  4318                              <1> 	;;JMP	word [CS:SI+D1]
  4319                              <1> 	;jmp	word [SI+D1]
  4320 000045C6 FFA6[13440000]      <1> 	jmp	dword [esi+D1]
  4321                              <1> ;;BAD_COMMAND_POP:
  4322                              <1> ;;	POP	AX
  4323                              <1> ;;	POP	BX
  4324                              <1> BAD_COMMAND:
  4325 000045CC C605[5B590100]01    <1>         MOV     byte [DISK_STATUS1],BAD_CMD  ; COMMAND ERROR
  4326 000045D3 B000                <1> 	MOV	AL,0
  4327 000045D5 C3                  <1> 	RETn
  4328                              <1> 
  4329                              <1> ;----------------------------------------
  4330                              <1> ;	RESET THE DISK SYSTEM  (AH=00H) :
  4331                              <1> ;----------------------------------------
  4332                              <1> 
  4333                              <1> ; 18-1-2015 : one controller reset (not other one)
  4334                              <1> 
  4335                              <1> DISK_RESET:
  4336 000045D6 FA                  <1> 	CLI
  4337 000045D7 E4A1                <1> 	IN	AL,INTB01		; GET THE MASK REGISTER
  4338                              <1> 	;JMP	$+2
  4339                              <1> 	IODELAY
  4339 000045D9 EB00                <2>  jmp short $+2
  4339 000045DB EB00                <2>  jmp short $+2
  4340                              <1> 	;AND	AL,0BFH 		; ENABLE FIXED DISK INTERRUPT
  4341 000045DD 243F                <1> 	and	al,3Fh			; 22/12/2014 (IRQ 14 & IRQ 15)
  4342 000045DF E6A1                <1> 	OUT	INTB01,AL
  4343 000045E1 FB                  <1> 	STI				; START INTERRUPTS
  4344                              <1> 	; 14/02/2015
  4345 000045E2 6689D7              <1> 	mov	di, dx	
  4346                              <1> 	; 04/01/2015
  4347                              <1> 	;xor	di,di
  4348                              <1> drst0:
  4349 000045E5 B004                <1> 	MOV	AL,04H  ; bit 2 - SRST 
  4350                              <1> 	;MOV	DX,HF_REG_PORT
  4351 000045E7 668B15[4A5D0000]    <1> 	MOV	DX,[HF_REG_PORT]
  4352 000045EE EE                  <1> 	OUT	DX,AL			; RESET
  4353                              <1> ;	MOV	CX,10			; DELAY COUNT
  4354                              <1> ;DRD:	DEC	CX
  4355                              <1> ;	JNZ	short DRD		; WAIT 4.8 MICRO-SEC
  4356                              <1> 	;mov	cx,2			; wait for 30 micro seconds	
  4357 000045EF B902000000          <1>         mov	ecx, 2 ; 21/02/2015
  4358 000045F4 E8FDD7FFFF          <1> 	call    WAITF                   ; (Award Bios 1999 - WAIT_REFRESH,
  4359                              <1>                                         ; 40 micro seconds)
  4360 000045F9 A0[5D590100]        <1> 	mov	al,[CONTROL_BYTE]
  4361 000045FE 240F                <1> 	AND	AL,0FH			; SET HEAD OPTION
  4362 00004600 EE                  <1> 	OUT	DX,AL			; TURN RESET OFF
  4363 00004601 E86A040000          <1> 	CALL	NOT_BUSY
  4364 00004606 7515                <1> 	JNZ	short DRERR		; TIME OUT ON RESET
  4365 00004608 668B15[485D0000]    <1> 	MOV	DX,[HF_PORT]
  4366 0000460F FEC2                <1> 	inc	dl  ; HF_PORT+1
  4367                              <1> 	; 02/01/2015 - Award BIOS 1999 - AHDSK.ASM
  4368                              <1>         ;mov     cl, 10
  4369 00004611 B90A000000          <1>         mov     ecx, 10 ; 21/02/2015 
  4370                              <1> drst1:
  4371 00004616 EC                  <1> 	IN	AL,DX			; GET RESET STATUS
  4372 00004617 3C01                <1> 	CMP	AL,1
  4373                              <1> 	; 04/01/2015
  4374 00004619 740A                <1> 	jz	short drst2
  4375                              <1> 	;JNZ	short DRERR		; BAD RESET STATUS
  4376                              <1>         	; Drive/Head Register - bit 4
  4377 0000461B E2F9                <1> 	loop	drst1
  4378                              <1> DRERR:	
  4379 0000461D C605[5B590100]05    <1> 	MOV	byte [DISK_STATUS1],BAD_RESET ; CARD FAILED
  4380 00004624 C3                  <1> 	RETn
  4381                              <1> drst2:
  4382                              <1> 	; 14/02/2015
  4383 00004625 6689FA              <1> 	mov	dx,di
  4384                              <1> ;drst3:
  4385                              <1> ;	; 05/01/2015
  4386                              <1> ;	shl 	di,1
  4387                              <1> ;	; 04/01/2015
  4388                              <1> ;	mov	ax,[di+hd_cports]
  4389                              <1> ;	cmp	ax,[HF_REG_PORT]
  4390                              <1> ;	je	short drst4
  4391                              <1> ;	mov	[HF_REG_PORT], ax
  4392                              <1> ;	; 03/01/2015
  4393                              <1> ;	mov	ax,[di+hd_ports]
  4394                              <1> ;       mov     [HF_PORT], ax
  4395                              <1> ;	; 05/01/2014
  4396                              <1> ;	shr	di,1
  4397                              <1> ;	; 04/01/2015
  4398                              <1> ;	jmp	short drst0	; reset other controller
  4399                              <1> ;drst4:
  4400                              <1> ;	; 05/01/2015
  4401                              <1> ;	shr	di,1
  4402                              <1> ;	mov	al,[di+hd_dregs]
  4403                              <1> ;	and	al,10h ; bit 4 only
  4404                              <1> ;	shr	al,4 ; bit 4  -> bit 0
  4405                              <1> ;	mov	[hf_m_s], al ; (0 = master, 1 = slave)
  4406                              <1> 	;
  4407 00004628 A0[4C5D0000]        <1> 	mov	al, [hf_m_s] ; 18/01/2015
  4408 0000462D A801                <1> 	test	al,1
  4409                              <1> ;	jnz	short drst6
  4410 0000462F 7516                <1>         jnz     short drst4
  4411 00004631 8065FDEF            <1> 	AND     byte [CMD_BLOCK+5],0EFH ; SET TO DRIVE 0
  4412                              <1> ;drst5:
  4413                              <1> drst3:
  4414 00004635 E867010000          <1> 	CALL	INIT_DRV		; SET MAX HEADS
  4415                              <1> 	;mov	dx,di
  4416 0000463A E81F020000          <1> 	CALL	HDISK_RECAL		; RECAL TO RESET SEEK SPEED
  4417                              <1> 	; 04/01/2014
  4418                              <1> ;	inc	di
  4419                              <1> ;	mov	dx,di
  4420                              <1> ;	cmp	dl,[HF_NUM]
  4421                              <1> ;	jb	short drst3
  4422                              <1> ;DRE:
  4423 0000463F C605[5B590100]00    <1> 	MOV	byte [DISK_STATUS1],0 	; IGNORE ANY SET UP ERRORS
  4424 00004646 C3                  <1> 	RETn
  4425                              <1> ;drst6:
  4426                              <1> drst4:		; Drive/Head Register - bit 4
  4427 00004647 804DFD10            <1> 	OR      byte [CMD_BLOCK+5],010H ; SET TO DRIVE 1     
  4428                              <1>         ;jmp    short drst5
  4429 0000464B EBE8                <1>         jmp     short drst3
  4430                              <1> 
  4431                              <1> ;----------------------------------------
  4432                              <1> ;	DISK STATUS ROUTINE  (AH = 01H) :
  4433                              <1> ;----------------------------------------
  4434                              <1> 
  4435                              <1> RETURN_STATUS:
  4436 0000464D A0[5B590100]        <1> 	MOV	AL,[DISK_STATUS1]	; OBTAIN PREVIOUS STATUS
  4437 00004652 C605[5B590100]00    <1>         MOV     byte [DISK_STATUS1],0   ; RESET STATUS
  4438 00004659 C3                  <1> 	RETn
  4439                              <1> 
  4440                              <1> ;----------------------------------------
  4441                              <1> ;	DISK READ ROUTINE    (AH = 02H) :
  4442                              <1> ;----------------------------------------
  4443                              <1> 
  4444                              <1> DISK_READ:
  4445 0000465A C645FE20            <1> 	MOV	byte [CMD_BLOCK+6],READ_CMD
  4446 0000465E E986020000          <1>         JMP     COMMANDI
  4447                              <1> 
  4448                              <1> ;----------------------------------------
  4449                              <1> ;	DISK WRITE ROUTINE   (AH = 03H) :
  4450                              <1> ;----------------------------------------
  4451                              <1> 
  4452                              <1> DISK_WRITE:
  4453 00004663 C645FE30            <1> 	MOV	byte [CMD_BLOCK+6],WRITE_CMD
  4454 00004667 E9D8020000          <1>         JMP     COMMANDO
  4455                              <1> 
  4456                              <1> ;----------------------------------------
  4457                              <1> ;	DISK VERIFY	     (AH = 04H) :
  4458                              <1> ;----------------------------------------
  4459                              <1> 
  4460                              <1> DISK_VERF:
  4461 0000466C C645FE40            <1> 	MOV	byte [CMD_BLOCK+6],VERIFY_CMD
  4462 00004670 E846030000          <1> 	CALL	COMMAND
  4463 00004675 750C                <1> 	JNZ	short VERF_EXIT		; CONTROLLER STILL BUSY
  4464 00004677 E8B8030000          <1> 	CALL	_WAIT			; (Original: CALL WAIT)	
  4465 0000467C 7505                <1> 	JNZ	short VERF_EXIT		; TIME OUT
  4466 0000467E E845040000          <1> 	CALL	CHECK_STATUS
  4467                              <1> VERF_EXIT:
  4468 00004683 C3                  <1> 	RETn
  4469                              <1> 
  4470                              <1> ;----------------------------------------
  4471                              <1> ;	FORMATTING	     (AH = 05H) :
  4472                              <1> ;----------------------------------------
  4473                              <1> 
  4474                              <1> FMT_TRK:				; FORMAT TRACK	(AH = 005H)
  4475 00004684 C645FE50            <1> 	MOV	byte [CMD_BLOCK+6],FMTTRK_CMD
  4476                              <1> 	;PUSH	ES
  4477                              <1> 	;PUSH	BX
  4478 00004688 53                  <1> 	push	ebx
  4479 00004689 E8EC040000          <1> 	CALL	GET_VEC 		; GET DISK PARAMETERS ADDRESS
  4480                              <1> 	;MOV	AL,[ES:BX+14]		; GET SECTORS/TRACK
  4481 0000468E 8A430E              <1> 	mov	al, [ebx+14]
  4482 00004691 8845F9              <1> 	MOV	[CMD_BLOCK+1],AL 	; SET SECTOR COUNT IN COMMAND
  4483 00004694 5B                  <1> 	pop	ebx
  4484                              <1> 	;POP	BX
  4485                              <1> 	;POP	ES
  4486 00004695 E9B1020000          <1>         JMP     CMD_OF                  ; GO EXECUTE THE COMMAND
  4487                              <1> 
  4488                              <1> ; 30/08/2020
  4489                              <1> 
  4490                              <1> ;----------------------------------------
  4491                              <1> ;	READ DASD TYPE	     (AH = 15H) :
  4492                              <1> ;----------------------------------------
  4493                              <1> 
  4494                              <1> READ_DASD_TYPE:
  4495                              <1> READ_D_T:				; GET DRIVE PARAMETERS
  4496 0000469A 1E                  <1> 	PUSH	DS			; SAVE REGISTERS
  4497                              <1> 	;PUSH	ES
  4498 0000469B 53                  <1> 	PUSH	eBX
  4499                              <1> 	;CALL	DDS			; ESTABLISH ADDRESSING
  4500                              <1> 	;push	cs
  4501                              <1> 	;pop	ds
  4502 0000469C 66BB1000            <1>         mov	bx, KDATA
  4503 000046A0 8EDB                <1> 	mov	ds, bx
  4504                              <1> 	;mov	es, bx
  4505 000046A2 C605[5B590100]00    <1> 	MOV     byte [DISK_STATUS1],0
  4506 000046A9 8A1D[5C590100]      <1> 	MOV	BL,[HF_NUM]		; GET NUMBER OF DRIVES
  4507 000046AF 80E27F              <1> 	AND	DL,7FH			; GET DRIVE NUMBER
  4508 000046B2 38D3                <1> 	CMP	BL,DL
  4509 000046B4 763C                <1> 	JBE	short RDT_NOT_PRESENT 	; RETURN DRIVE NOT PRESENT
  4510 000046B6 0FB6C2              <1> 	movzx	eax, dl ; 28/08/2020
  4511 000046B9 E8BC040000          <1> 	CALL	GET_VEC 		; GET DISK PARAMETERS ADDRESS
  4512                              <1> 	
  4513                              <1> 	; 28/08/2020 - TRDOS 386 v2
  4514 000046BE F6431440            <1> 	test	byte [ebx+20], 40h	; LBA bit (bit 6)
  4515 000046C2 751D                <1> 	jnz	short RDT3 ; LBA disk (may be > 8GB)
  4516                              <1> 
  4517                              <1> 	;MOV	AL,[ES:BX+2]		; HEADS
  4518 000046C4 8A4302              <1> 	mov	al, [ebx+2]
  4519                              <1> 	;MOV	CL,[ES:BX+14]
  4520 000046C7 8A4B0E              <1> 	mov	cl, [ebx+14]
  4521 000046CA F6E9                <1> 	IMUL	CL			; * NUMBER OF SECTORS
  4522                              <1> 	;MOV	CX,[ES:BX]		; MAX NUMBER OF CYLINDERS
  4523 000046CC 668B0B              <1> 	mov	cx, [ebx]
  4524                              <1> 	;
  4525                              <1> 	; 02/01/2015 
  4526                              <1> 	; ** leave the last cylinder as reserved for diagnostics **
  4527                              <1> 	; (Also in Award BIOS - 1999, AHDSK.ASM, FUN15 -> sub ax, 1)
  4528 000046CF 6649                <1> 	DEC	CX			; LEAVE ONE FOR DIAGNOSTICS
  4529                              <1> 	;
  4530 000046D1 66F7E9              <1> 	IMUL	CX			; NUMBER OF SECTORS
  4531 000046D4 6689D1              <1> 	MOV	CX,DX			; HIGH ORDER HALF
  4532 000046D7 6689C2              <1> 	MOV	DX,AX			; LOW ORDER HALF
  4533                              <1> 	;SUB	AX,AX
  4534                              <1> 	; 28/08/2020
  4535                              <1> 	;sub	al, al
  4536                              <1> RDT4:
  4537 000046DA 29C0                <1> 	sub	eax, eax ; 28/08/2020
  4538                              <1> 	;
  4539 000046DC B403                <1> 	MOV	AH,03H			; INDICATE FIXED DISK
  4540                              <1> 	; 30/08/2020 (clc is not needed here)
  4541                              <1> 	;and	byte [esp+8], 0FEh ; clear carry bit of eflags register
  4542                              <1> RDT2:	
  4543 000046DE 5B                  <1> 	POP	eBX			; RESTORE REGISTERS
  4544                              <1> 	;POP	ES
  4545 000046DF 1F                  <1> 	POP	DS
  4546                              <1> 	; (*) CLC			; CLEAR CARRY
  4547                              <1> 	;RETf	2
  4548                              <1> 	; (*) 29/05/2016
  4549                              <1> 	; (*) retf 4
  4550                              <1> 	; 30/08/2020 (clc is not needed here)
  4551                              <1> 	;and	byte [esp+8], 0FEh ; clear carry bit of eflags register
  4552 000046E0 CF                  <1> 	iretd
  4553                              <1> 
  4554                              <1> RDT3:	; 28/08/2020
  4555                              <1> 	; (use the result of INT 13h, function 48h as disk size)
  4556                              <1> 	; eax = al = zero based hard disk number
  4557                              <1> 	; 29/08/2020
  4558                              <1> 	;add	al, 2 ; hd0 = physical disk drive 2
  4559 000046E1 C0E002              <1> 	shl	al, 2 ; * 4
  4560                              <1> RDT5:
  4561                              <1> 	;add	eax, drv.size
  4562 000046E4 05[8E5D0000]        <1> 	add	eax, drv.size+8 ; 29/08/2020
  4563 000046E9 668B10              <1> 	mov	dx, [eax]   ; low word of disk size
  4564 000046EC 668B4802            <1> 	mov	cx, [eax+2] ; high word of disk size
  4565                              <1> 	;sub	eax, eax
  4566 000046F0 EBE8                <1> 	jmp	short RDT4		
  4567                              <1> 
  4568                              <1> RDT_NOT_PRESENT:
  4569                              <1> 	; 30/08/2020
  4570 000046F2 C605[5B590100]AA    <1> 	mov	byte [DISK_STATUS1], NOT_RDY ; DRIVE NOT READY
  4571                              <1> 
  4572                              <1> 	;SUB	AX,AX			; DRIVE NOT PRESENT RETURN
  4573 000046F9 29C0                <1> 	sub	eax, eax ; 30/08/2020
  4574 000046FB 6689C1              <1> 	MOV	CX,AX			; ZERO BLOCK COUNT
  4575 000046FE 6689C2              <1> 	MOV	DX,AX
  4576                              <1> 	; 30/08/2020
  4577 00004701 804C241001          <1> 	or	byte [esp+16], 1 ; set carry bit of eflags register
  4578                              <1> 		; cf = 1 -> ah = 0, drive not ready, disk type = 0
  4579 00004706 EBD6                <1> 	JMP	short RDT2
  4580                              <1> 
  4581                              <1> ; 28/05/2016
  4582                              <1> ; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
  4583                              <1> 
  4584                              <1> ;----------------------------------------
  4585                              <1> ;	GET PARAMETERS	     (AH = 08H) :
  4586                              <1> ;----------------------------------------
  4587                              <1> 
  4588                              <1> GET_PARM_N:
  4589                              <1> 	; ebx = user's buffer address for parameters table
  4590                              <1> ;GET_PARM:				; GET DRIVE PARAMETERS
  4591 00004708 1E                  <1> 	PUSH	DS			; SAVE REGISTERS
  4592 00004709 06                  <1> 	PUSH	ES
  4593 0000470A 53                  <1> 	PUSH	eBX
  4594                              <1> 	;MOV	AX,ABS0 		; ESTABLISH ADDRESSING
  4595                              <1> 	;MOV	DS,AX
  4596                              <1> 	;TEST	DL,1			; CHECK FOR DRIVE 1
  4597                              <1> 	;JZ	short G0
  4598                              <1> 	;LES	BX,@HF1_TBL_VEC
  4599                              <1> 	;JMP	SHORT G1
  4600                              <1> ;G0:	LES	BX,@HF_TBL_VEC
  4601                              <1> ;G1:
  4602                              <1> 	;CALL	DDS			; ESTABLISH SEGMENT
  4603                              <1> 	; 22/12/2014
  4604                              <1> 	;push	cs
  4605                              <1> 	;pop	ds
  4606 0000470B 66BB1000            <1> 	mov	bx, KDATA
  4607 0000470F 8EDB                <1> 	mov	ds, bx
  4608 00004711 8EC3                <1> 	mov	es, bx	; 27/05/2016
  4609                              <1> 	;
  4610 00004713 80EA80              <1> 	SUB	DL,80H
  4611                              <1> 	;CMP	DL,MAX_FILE		; TEST WITHIN RANGE
  4612                              <1> 	;JAE	short G4 ; 29/08/2020 - BugFix
  4613                              <1> 	; 30/08/2020
  4614 00004716 3A15[5C590100]      <1> 	cmp	dl, [HF_NUM] ; is hard disk index < hard disk count ?	
  4615 0000471C 736A                <1> 	jae	short G4     ; no, error ! drive not ready !	
  4616                              <1> 	;
  4617 0000471E 31DB                <1> 	xor	ebx, ebx ; 21/02/2015
  4618                              <1> 	; 22/12/2014
  4619 00004720 88D3                <1> 	mov	bl, dl
  4620                              <1> 	;xor	bh, bh  
  4621 00004722 C0E302              <1> 	shl	bl, 2			; convert index to offset
  4622                              <1> 	;add	bx, HF_TBL_VEC
  4623 00004725 81C3[60590100]      <1> 	add	ebx, HF_TBL_VEC
  4624                              <1> 	;mov	ax, [bx+2]
  4625                              <1> 	;mov	es, ax			; dpt segment
  4626                              <1> 	;mov	bx, [bx]		; dpt offset
  4627 0000472B 8B1B                <1> 	mov	ebx, [ebx] ; 32 bit offset	
  4628                              <1> 
  4629 0000472D C605[5B590100]00    <1> 	MOV	byte [DISK_STATUS1],0
  4630                              <1>         ;MOV	AX,[ES:BX]		; MAX NUMBER OF CYLINDERS
  4631 00004734 668B03              <1> 	mov	ax, [ebx]
  4632                              <1> 	;;SUB	AX,2			; ADJUST FOR 0-N
  4633 00004737 6648                <1> 	dec	ax			; max. cylinder number
  4634 00004739 88C5                <1> 	MOV	CH,AL
  4635 0000473B 66250003            <1> 	AND	AX,0300H		; HIGH TWO BITS OF CYLINDER
  4636 0000473F 66D1E8              <1> 	SHR	AX,1
  4637 00004742 66D1E8              <1> 	SHR	AX,1
  4638                              <1> 	;OR	AL,[ES:BX+14]		; SECTORS
  4639 00004745 0A430E              <1> 	or	al, [ebx+14]
  4640 00004748 88C1                <1> 	MOV	CL,AL
  4641                              <1> 	;MOV	DH,[ES:BX+2]		; HEADS
  4642 0000474A 8A7302              <1> 	mov	dh, [ebx+2]
  4643 0000474D FECE                <1> 	DEC	DH			; 0-N RANGE
  4644 0000474F 8A15[5C590100]      <1> 	MOV	DL,[HF_NUM]		; DRIVE COUNT
  4645 00004755 6629C0              <1> 	SUB	AX,AX
  4646                              <1>         ;27/12/2014 
  4647                              <1> 	;mov	di, bx			; HDPT offset
  4648                              <1> 
  4649                              <1> 	; 29/08/2020
  4650 00004758 833C2400            <1> 	cmp	dword [esp], 0
  4651 0000475C 7703                <1> 	ja	short G7 ; ebx > 0
  4652                              <1> 
  4653                              <1> 	; if EBX (user's buffer address) = 0, do not copy DPT
  4654 0000475E 5B                  <1> 	pop	ebx
  4655 0000475F EB24                <1> 	jmp	short G5
  4656                              <1> G7:
  4657                              <1> 	; 27/05/2016
  4658                              <1> 	; return fixed disk parameters table to user
  4659                              <1> 	; in user's buffer, which is pointed by EBX
  4660                              <1> 	;
  4661 00004761 873C24              <1> 	xchg	edi, [esp]		; ebx (input)-> edi, edi -> [esp]
  4662 00004764 56                  <1> 	push	esi
  4663 00004765 89DE                <1> 	mov	esi, ebx		; hard disk parameter table (32 bytes)	
  4664 00004767 89FB                <1> 	mov	ebx, edi		; ebx = user's buffer address
  4665 00004769 51                  <1> 	push	ecx
  4666 0000476A 50                  <1> 	push	eax
  4667 0000476B B920000000          <1> 	mov	ecx, 32 ; 32 bytes
  4668 00004770 E888A00000          <1> 	call	transfer_to_user_buffer ; trdosk6.s (16/05/2016)
  4669 00004775 58                  <1> 	pop	eax
  4670 00004776 59                  <1> 	pop	ecx
  4671 00004777 5E                  <1> 	pop	esi
  4672 00004778 5F                  <1> 	pop	edi
  4673 00004779 730A                <1> 	jnc	short G5
  4674                              <1> 	; 29/05/2016 (*)
  4675 0000477B B8FF000000          <1> 	mov	eax, 0FFh ; unknown error !
  4676                              <1> G6:
  4677 00004780 804C241001          <1> 	or	byte [esp+16], 1 ; set carry bit of eflags register
  4678                              <1> G5:
  4679                              <1> 	; 27/05/2016
  4680                              <1> 	;POP	eBX			; RESTORE REGISTERS
  4681 00004785 07                  <1> 	POP	ES
  4682 00004786 1F                  <1> 	POP	DS
  4683                              <1> 	;RETf	2
  4684                              <1> 	; (*) 29/05/2016
  4685                              <1> 	; (*) retf 4
  4686                              <1> 	; (*) or byte [esp+8], 1 ; set carry bit of eflags register
  4687 00004787 CF                  <1> 	iretd
  4688                              <1> G4:
  4689 00004788 C605[5B590100]07    <1> 	MOV     byte [DISK_STATUS1],INIT_FAIL ; OPERATION FAILED
  4690                              <1> 	;mov	ah, NOT_DRY ; 30/08/2020 - 'drive not ready' error code
  4691 0000478F B407                <1> 	MOV	AH,INIT_FAIL
  4692 00004791 28C0                <1> 	SUB	AL,AL
  4693                              <1> 	;SUB	DX,DX
  4694                              <1> 	; 30/08/2020
  4695 00004793 8A15[5C590100]      <1> 	mov	dl, [HF_NUM] ; disk count
  4696 00004799 28F6                <1> 	sub	dh, dh
  4697 0000479B 6629C9              <1> 	SUB	CX,CX
  4698                              <1> 	; 29/05/2016 (*)
  4699                              <1> 	;STC				; SET ERROR FLAG
  4700                              <1> 	;JMP	short G5
  4701                              <1> 	; 29/08/2020 - BugFix
  4702 0000479E 5B                  <1> 	pop	ebx
  4703 0000479F EBDF                <1> 	jmp	short G6
  4704                              <1> 
  4705                              <1> ;----------------------------------------
  4706                              <1> ;	INITIALIZE DRIVE     (AH = 09H) :
  4707                              <1> ;----------------------------------------
  4708                              <1> 	; 03/01/2015
  4709                              <1> 	; According to ATA-ATAPI specification v2.0 to v5.0
  4710                              <1> 	; logical sector per logical track
  4711                              <1> 	; and logical heads - 1 would be set but
  4712                              <1> 	; it is seen as it will be good
  4713                              <1> 	; if physical parameters will be set here
  4714                              <1> 	; because, number of heads <= 16.
  4715                              <1> 	; (logical heads usually more than 16)
  4716                              <1> 	; NOTE: ATA logical parameters (software C, H, S)
  4717                              <1> 	;	== INT 13h physical parameters
  4718                              <1> 
  4719                              <1> ;INIT_DRV:
  4720                              <1> ;	MOV	byte [CMD_BLOCK+6],SET_PARM_CMD
  4721                              <1> ;	CALL	GET_VEC 		; ES:BX -> PARAMETER BLOCK
  4722                              <1> ;	MOV	AL,[ES:BX+2]		; GET NUMBER OF HEADS
  4723                              <1> ;	DEC	AL			; CONVERT TO 0-INDEX
  4724                              <1> ;	MOV	AH,[CMD_BLOCK+5] 	; GET SDH REGISTER
  4725                              <1> ;	AND	AH,0F0H 		; CHANGE HEAD NUMBER
  4726                              <1> ;	OR	AH,AL			; TO MAX HEAD
  4727                              <1> ;	MOV	[CMD_BLOCK+5],AH
  4728                              <1> ;	MOV	AL,[ES:BX+14]		; MAX SECTOR NUMBER
  4729                              <1> ;	MOV	[CMD_BLOCK+1],AL
  4730                              <1> ;	SUB	AX,AX
  4731                              <1> ;	MOV	[CMD_BLOCK+3],AL 	; ZERO FLAGS
  4732                              <1> ;	CALL	COMMAND 		; TELL CONTROLLER
  4733                              <1> ;	JNZ	short INIT_EXIT		; CONTROLLER BUSY ERROR
  4734                              <1> ;	CALL	NOT_BUSY		; WAIT FOR IT TO BE DONE
  4735                              <1> ;	JNZ	short INIT_EXIT		; TIME OUT
  4736                              <1> ;	CALL	CHECK_STATUS
  4737                              <1> ;INIT_EXIT:
  4738                              <1> ;	RETn
  4739                              <1> 
  4740                              <1> ; 04/01/2015
  4741                              <1> ; 02/01/2015 - Derived from from AWARD BIOS 1999
  4742                              <1> ;				 AHDSK.ASM - INIT_DRIVE
  4743                              <1> INIT_DRV:
  4744                              <1> 	;xor	ah,ah
  4745 000047A1 31C0                <1> 	xor	eax, eax ; 21/02/2015
  4746 000047A3 B00B                <1> 	mov	al,11 ; Physical heads from translated HDPT
  4747 000047A5 3825[70590100]      <1>         cmp     [LBAMode], ah   ; 0
  4748 000047AB 7702                <1> 	ja	short idrv0
  4749 000047AD B002                <1> 	mov	al,2  ; Physical heads from standard HDPT
  4750                              <1> idrv0:
  4751                              <1> 	; DL = drive number (0 based)
  4752 000047AF E8C6030000          <1> 	call	GET_VEC
  4753                              <1> 	;push	bx
  4754 000047B4 53                  <1> 	push	ebx ; 21/02/2015
  4755                              <1> 	;add	bx,ax
  4756 000047B5 01C3                <1> 	add	ebx, eax
  4757                              <1> 	;; 05/01/2015
  4758 000047B7 8A25[4C5D0000]      <1> 	mov	ah, [hf_m_s] ; drive number (0= master, 1= slave)
  4759                              <1> 	;;and 	ah,1 
  4760 000047BD C0E404              <1> 	shl	ah,4
  4761 000047C0 80CCA0              <1> 	or	ah,0A0h  ; Drive/Head register - 10100000b (A0h)	
  4762                              <1> 	;mov	al,[es:bx]
  4763 000047C3 8A03                <1> 	mov	al, [ebx] ; 21/02/2015
  4764 000047C5 FEC8                <1> 	dec	al	 ; last head number 
  4765                              <1> 	;and	al,0Fh
  4766 000047C7 08E0                <1> 	or	al,ah	 ; lower 4 bits for head number
  4767                              <1> 	;
  4768 000047C9 C645FE91            <1> 	mov	byte [CMD_BLOCK+6],SET_PARM_CMD
  4769 000047CD 8845FD              <1> 	mov	[CMD_BLOCK+5],al
  4770                              <1> 	;pop	bx
  4771 000047D0 5B                  <1> 	pop	ebx
  4772 000047D1 29C0                <1> 	sub	eax, eax ; 21/02/2015
  4773 000047D3 B004                <1> 	mov	al,4 ; Physical sec per track from translated HDPT
  4774 000047D5 803D[70590100]00    <1> 	cmp	byte [LBAMode], 0
  4775 000047DC 7702                <1> 	ja	short idrv1
  4776 000047DE B00E                <1> 	mov	al,14 ; Physical sec per track from standard HDPT
  4777                              <1> idrv1:
  4778                              <1> 	;xor	ah,ah
  4779                              <1> 	;add	bx,ax
  4780 000047E0 01C3                <1> 	add	ebx, eax ; 21/02/2015
  4781                              <1> 	;mov	al,[es:bx]
  4782                              <1> 			; sector number
  4783 000047E2 8A03                <1> 	mov	al, [ebx]
  4784 000047E4 8845F9              <1> 	mov	[CMD_BLOCK+1],al
  4785 000047E7 28C0                <1> 	sub	al,al
  4786 000047E9 8845FB              <1> 	mov	[CMD_BLOCK+3],al  ; ZERO FLAGS
  4787 000047EC E8CA010000          <1> 	call	COMMAND 	  ; TELL CONTROLLER
  4788 000047F1 750C                <1> 	jnz	short INIT_EXIT	  ; CONTROLLER BUSY ERROR
  4789 000047F3 E878020000          <1> 	call	NOT_BUSY	  ; WAIT FOR IT TO BE DONE
  4790 000047F8 7505                <1> 	jnz	short INIT_EXIT	  ; TIME OUT
  4791 000047FA E8C9020000          <1> 	call	CHECK_STATUS
  4792                              <1> INIT_EXIT:
  4793 000047FF C3                  <1> 	RETn
  4794                              <1> 
  4795                              <1> ;----------------------------------------
  4796                              <1> ;	READ LONG	     (AH = 0AH) :
  4797                              <1> ;----------------------------------------
  4798                              <1> 
  4799                              <1> RD_LONG:
  4800                              <1> 	;MOV	@CMD_BLOCK+6,READ_CMD OR ECC_MODE
  4801 00004800 C645FE22            <1>         mov     byte [CMD_BLOCK+6],READ_CMD + ECC_MODE 
  4802 00004804 E9E0000000          <1>         JMP     COMMANDI
  4803                              <1> 
  4804                              <1> ;----------------------------------------
  4805                              <1> ;	WRITE LONG	     (AH = 0BH) :
  4806                              <1> ;----------------------------------------
  4807                              <1> 
  4808                              <1> WR_LONG:
  4809                              <1> 	;MOV	@CMD_BLOCK+6,WRITE_CMD OR ECC_MODE
  4810 00004809 C645FE32            <1>         MOV     byte [CMD_BLOCK+6],WRITE_CMD + ECC_MODE
  4811 0000480D E932010000          <1>         JMP     COMMANDO
  4812                              <1> 
  4813                              <1> ;----------------------------------------
  4814                              <1> ;	SEEK		     (AH = 0CH) :
  4815                              <1> ;----------------------------------------
  4816                              <1> 
  4817                              <1> DISK_SEEK:
  4818 00004812 C645FE70            <1>         MOV     byte [CMD_BLOCK+6],SEEK_CMD
  4819 00004816 E8A0010000          <1> 	CALL	COMMAND
  4820 0000481B 751C                <1> 	JNZ	short DS_EXIT 		; CONTROLLER BUSY ERROR
  4821 0000481D E812020000          <1> 	CALL	_WAIT
  4822 00004822 7515                <1>         JNZ     DS_EXIT                 ; TIME OUT ON SEEK
  4823 00004824 E89F020000          <1> 	CALL	CHECK_STATUS
  4824 00004829 803D[5B590100]40    <1>         CMP     byte [DISK_STATUS1],BAD_SEEK
  4825 00004830 7507                <1> 	JNE	short DS_EXIT
  4826 00004832 C605[5B590100]00    <1>         MOV     byte [DISK_STATUS1],0
  4827                              <1> DS_EXIT:
  4828 00004839 C3                  <1> 	RETn
  4829                              <1> 
  4830                              <1> ;----------------------------------------
  4831                              <1> ;	TEST DISK READY      (AH = 10H) :
  4832                              <1> ;----------------------------------------
  4833                              <1> 
  4834                              <1> TST_RDY:				; WAIT FOR CONTROLLER
  4835 0000483A E831020000          <1> 	CALL	NOT_BUSY
  4836 0000483F 751C                <1> 	JNZ	short TR_EX
  4837 00004841 8A45FD              <1> 	MOV	AL,[CMD_BLOCK+5] 	; SELECT DRIVE
  4838 00004844 668B15[485D0000]    <1> 	MOV	DX,[HF_PORT]
  4839 0000484B 80C206              <1> 	add	dl,6
  4840 0000484E EE                  <1> 	OUT	DX,AL
  4841 0000484F E88C020000          <1> 	CALL	CHECK_ST		; CHECK STATUS ONLY
  4842 00004854 7507                <1> 	JNZ	short TR_EX
  4843 00004856 C605[5B590100]00    <1> 	MOV	byte [DISK_STATUS1],0 	; WIPE OUT DATA CORRECTED ERROR
  4844                              <1> TR_EX:	
  4845 0000485D C3                  <1> 	RETn
  4846                              <1> 
  4847                              <1> ;----------------------------------------
  4848                              <1> ;	RECALIBRATE	     (AH = 11H) :
  4849                              <1> ;----------------------------------------
  4850                              <1> 
  4851                              <1> HDISK_RECAL:
  4852 0000485E C645FE10            <1>         MOV     byte [CMD_BLOCK+6],RECAL_CMD ; 10h, 16
  4853 00004862 E854010000          <1> 	CALL	COMMAND 		; START THE OPERATION
  4854 00004867 7523                <1> 	JNZ	short RECAL_EXIT	; ERROR
  4855 00004869 E8C6010000          <1> 	CALL	_WAIT			; WAIT FOR COMPLETION
  4856 0000486E 7407                <1> 	JZ	short RECAL_X 		; TIME OUT ONE OK ?
  4857 00004870 E8BF010000          <1> 	CALL	_WAIT			; WAIT FOR COMPLETION LONGER
  4858 00004875 7515                <1> 	JNZ	short RECAL_EXIT	; TIME OUT TWO TIMES IS ERROR
  4859                              <1> RECAL_X:
  4860 00004877 E84C020000          <1> 	CALL	CHECK_STATUS
  4861 0000487C 803D[5B590100]40    <1> 	CMP	byte [DISK_STATUS1],BAD_SEEK ; SEEK NOT COMPLETE
  4862 00004883 7507                <1> 	JNE	short RECAL_EXIT	; IS OK
  4863 00004885 C605[5B590100]00    <1> 	MOV	byte [DISK_STATUS1],0
  4864                              <1> RECAL_EXIT:
  4865 0000488C 803D[5B590100]00    <1>         CMP     byte [DISK_STATUS1],0
  4866 00004893 C3                  <1> 	RETn
  4867                              <1> 
  4868                              <1> ;----------------------------------------
  4869                              <1> ;      CONTROLLER DIAGNOSTIC (AH = 14H) :
  4870                              <1> ;----------------------------------------
  4871                              <1> 
  4872                              <1> CTLR_DIAGNOSTIC:
  4873 00004894 FA                  <1>         CLI                             ; DISABLE INTERRUPTS WHILE CHANGING MASK
  4874 00004895 E4A1                <1> 	IN	AL,INTB01		; TURN ON SECOND INTERRUPT CHIP
  4875                              <1> 	;AND	AL,0BFH
  4876 00004897 243F                <1> 	and	al, 3Fh			; enable IRQ 14 & IRQ 15
  4877                              <1> 	;JMP	$+2
  4878                              <1> 	IODELAY
  4878 00004899 EB00                <2>  jmp short $+2
  4878 0000489B EB00                <2>  jmp short $+2
  4879 0000489D E6A1                <1> 	OUT	INTB01,AL
  4880                              <1> 	IODELAY
  4880 0000489F EB00                <2>  jmp short $+2
  4880 000048A1 EB00                <2>  jmp short $+2
  4881 000048A3 E421                <1> 	IN	AL,INTA01		; LET INTERRUPTS PASS THRU TO
  4882 000048A5 24FB                <1> 	AND	AL,0FBH 		;  SECOND CHIP
  4883                              <1> 	;JMP	$+2
  4884                              <1> 	IODELAY
  4884 000048A7 EB00                <2>  jmp short $+2
  4884 000048A9 EB00                <2>  jmp short $+2
  4885 000048AB E621                <1> 	OUT	INTA01,AL
  4886 000048AD FB                  <1> 	STI
  4887 000048AE E8BD010000          <1> 	CALL	NOT_BUSY		; WAIT FOR CARD
  4888 000048B3 752B                <1> 	JNZ	short CD_ERR		; BAD CARD
  4889                              <1> 	;MOV	DX, HF_PORT+7
  4890 000048B5 668B15[485D0000]    <1> 	mov	dx, [HF_PORT]
  4891 000048BC 80C207              <1> 	add	dl, 7
  4892 000048BF B090                <1> 	MOV	AL,DIAG_CMD		; START DIAGNOSE
  4893 000048C1 EE                  <1> 	OUT	DX,AL
  4894 000048C2 E8A9010000          <1> 	CALL	NOT_BUSY		; WAIT FOR IT TO COMPLETE
  4895 000048C7 B480                <1> 	MOV	AH,TIME_OUT
  4896 000048C9 7517                <1> 	JNZ	short CD_EXIT 		; TIME OUT ON DIAGNOSTIC
  4897                              <1> 	;MOV	DX,HF_PORT+1		; GET ERROR REGISTER
  4898 000048CB 668B15[485D0000]    <1> 	mov	dx, [HF_PORT]
  4899 000048D2 FEC2                <1> 	inc	dl
  4900 000048D4 EC                  <1> 	IN	AL,DX
  4901 000048D5 A2[52590100]        <1> 	MOV	[HF_ERROR],AL		; SAVE IT
  4902 000048DA B400                <1> 	MOV	AH,0
  4903 000048DC 3C01                <1> 	CMP	AL,1			; CHECK FOR ALL OK
  4904 000048DE 7402                <1> 	JE	SHORT CD_EXIT
  4905 000048E0 B420                <1> CD_ERR: MOV	AH,BAD_CNTLR
  4906                              <1> CD_EXIT:
  4907 000048E2 8825[5B590100]      <1> 	MOV	[DISK_STATUS1],AH
  4908 000048E8 C3                  <1> 	RETn
  4909                              <1> 
  4910                              <1> ;----------------------------------------
  4911                              <1> ; COMMANDI				:
  4912                              <1> ;	REPEATEDLY INPUTS DATA TILL	:
  4913                              <1> ;	NSECTOR RETURNS ZERO		:
  4914                              <1> ;----------------------------------------
  4915                              <1> COMMANDI:
  4916 000048E9 E862020000          <1> 	CALL	CHECK_DMA		; CHECK 64K BOUNDARY ERROR
  4917 000048EE 7253                <1> 	JC	short CMD_ABORT
  4918                              <1> 	;MOV	DI,BX
  4919 000048F0 89DF                <1> 	mov	edi, ebx ; 21/02/2015
  4920 000048F2 E8C4000000          <1> 	CALL	COMMAND 		; OUTPUT COMMAND
  4921 000048F7 754A                <1> 	JNZ	short CMD_ABORT
  4922                              <1> CMD_I1:
  4923 000048F9 E836010000          <1> 	CALL	_WAIT			; WAIT FOR DATA REQUEST INTERRUPT
  4924 000048FE 7543                <1> 	JNZ	short TM_OUT		; TIME OUT
  4925                              <1> cmd_i1x: ; 18/02/2016
  4926                              <1> 	;MOV	CX,256			; SECTOR SIZE IN WORDS
  4927 00004900 B900010000          <1> 	mov	ecx, 256 ; 21/02/2015	
  4928                              <1> 	;MOV	DX,HF_PORT
  4929 00004905 668B15[485D0000]    <1> 	mov	dx,[HF_PORT]
  4930 0000490C FA                  <1> 	CLI
  4931 0000490D FC                  <1> 	CLD
  4932 0000490E F3666D              <1> 	REP	INSW			; GET THE SECTOR
  4933 00004911 FB                  <1> 	STI
  4934 00004912 F645FE02            <1> 	TEST	byte [CMD_BLOCK+6],ECC_MODE ; CHECK FOR NORMAL INPUT
  4935 00004916 7419                <1> 	JZ	short CMD_I3
  4936 00004918 E880010000          <1> 	CALL	WAIT_DRQ		; WAIT FOR DATA REQUEST
  4937 0000491D 7224                <1> 	JC	short TM_OUT
  4938                              <1> 	;MOV	DX,HF_PORT
  4939 0000491F 668B15[485D0000]    <1> 	mov	dx,[HF_PORT]
  4940                              <1> 	;MOV	CX,4			; GET ECC BYTES
  4941 00004926 B904000000          <1> 	mov 	ecx, 4 ; mov cx, 4 
  4942 0000492B EC                  <1> CMD_I2: IN	AL,DX
  4943                              <1> 	;MOV	[ES:DI],AL		; GO SLOW FOR BOARD
  4944 0000492C 8807                <1> 	mov 	[edi], al ; 21/02/2015
  4945 0000492E 47                  <1> 	INC	eDI
  4946 0000492F E2FA                <1> 	LOOP	CMD_I2
  4947                              <1> CMD_I3: 
  4948                              <1> 	; wait for 400 ns
  4949 00004931 80C207              <1> 	add 	dl, 7
  4950 00004934 EC                  <1> 	in	al, dx
  4951 00004935 EC                  <1> 	in	al, dx
  4952 00004936 EC                  <1> 	in	al, dx
  4953                              <1> 	;
  4954 00004937 E88C010000          <1> 	CALL	CHECK_STATUS
  4955 0000493C 7505                <1> 	JNZ	short CMD_ABORT		; ERROR RETURNED
  4956 0000493E FE4DF9              <1> 	DEC	byte [CMD_BLOCK+1]	; CHECK FOR MORE
  4957                              <1> 	;JNZ	SHORT CMD_I1
  4958 00004941 75BD                <1> 	jnz	short cmd_i1x ; 18/02/2016
  4959                              <1> CMD_ABORT:
  4960 00004943 C3                  <1> TM_OUT: RETn
  4961                              <1> 
  4962                              <1> ;----------------------------------------
  4963                              <1> ; COMMANDO				:
  4964                              <1> ;	REPEATEDLY OUTPUTS DATA TILL	:
  4965                              <1> ;	NSECTOR RETURNS ZERO		:
  4966                              <1> ;----------------------------------------
  4967                              <1> COMMANDO:
  4968 00004944 E807020000          <1> 	CALL	CHECK_DMA		; CHECK 64K BOUNDARY ERROR
  4969 00004949 72F8                <1> 	JC	short CMD_ABORT
  4970 0000494B 89DE                <1> CMD_OF: MOV	eSI,eBX ; 21/02/2015
  4971 0000494D E869000000          <1> 	CALL	COMMAND 		; OUTPUT COMMAND
  4972 00004952 75EF                <1> 	JNZ	short CMD_ABORT
  4973 00004954 E844010000          <1> 	CALL	WAIT_DRQ		; WAIT FOR DATA REQUEST
  4974 00004959 72E8                <1> 	JC	short TM_OUT			; TOO LONG
  4975                              <1> CMD_O1: ;PUSH	DS
  4976                              <1> 	;PUSH	ES			; MOVE ES TO DS
  4977                              <1> 	;POP	DS
  4978                              <1> 	;MOV	CX,256			; PUT THE DATA OUT TO THE CARD
  4979                              <1> 	;MOV	DX,HF_PORT
  4980                              <1> 	; 01/02/2015
  4981 0000495B 668B15[485D0000]    <1> 	mov	dx, [HF_PORT]
  4982                              <1> 	;push	es
  4983                              <1> 	;pop	ds
  4984                              <1> 	;mov	cx, 256
  4985 00004962 B900010000          <1> 	mov	ecx, 256 ; 21/02/2015
  4986 00004967 FA                  <1> 	CLI
  4987 00004968 FC                  <1> 	CLD
  4988 00004969 F3666F              <1> 	REP	OUTSW
  4989 0000496C FB                  <1> 	STI
  4990                              <1> 	;POP	DS			; RESTORE DS
  4991 0000496D F645FE02            <1> 	TEST	byte [CMD_BLOCK+6],ECC_MODE ; CHECK FOR NORMAL OUTPUT
  4992 00004971 7419                <1> 	JZ	short CMD_O3
  4993 00004973 E825010000          <1> 	CALL	WAIT_DRQ		; WAIT FOR DATA REQUEST
  4994 00004978 72C9                <1> 	JC	short TM_OUT
  4995                              <1> 	;MOV	DX,HF_PORT
  4996 0000497A 668B15[485D0000]    <1> 	mov	dx, [HF_PORT]
  4997                              <1> 	;MOV	CX,4			; OUTPUT THE ECC BYTES
  4998 00004981 B904000000          <1> 	mov	ecx, 4  ; mov cx, 4
  4999                              <1> CMD_O2: ;MOV	AL,[ES:SI]
  5000 00004986 8A06                <1> 	mov	al, [esi]
  5001 00004988 EE                  <1> 	OUT	DX,AL
  5002 00004989 46                  <1> 	INC	eSI
  5003 0000498A E2FA                <1> 	LOOP	CMD_O2
  5004                              <1> CMD_O3:
  5005 0000498C E8A3000000          <1> 	CALL	_WAIT			; WAIT FOR SECTOR COMPLETE INTERRUPT
  5006 00004991 75B0                <1> 	JNZ	short TM_OUT		; ERROR RETURNED
  5007 00004993 E830010000          <1> 	CALL	CHECK_STATUS
  5008 00004998 75A9                <1> 	JNZ	short CMD_ABORT
  5009 0000499A F605[51590100]08    <1> 	TEST	byte [HF_STATUS],ST_DRQ	; CHECK FOR MORE
  5010 000049A1 75B8                <1> 	JNZ	SHORT CMD_O1
  5011                              <1> 	;MOV	DX,HF_PORT+2		; CHECK RESIDUAL SECTOR COUNT
  5012 000049A3 668B15[485D0000]    <1> 	mov	dx, [HF_PORT]
  5013                              <1> 	;add	dl, 2
  5014 000049AA FEC2                <1> 	inc	dl
  5015 000049AC FEC2                <1> 	inc	dl
  5016 000049AE EC                  <1> 	IN	AL,DX			;
  5017 000049AF A8FF                <1> 	TEST	AL,0FFH 		;
  5018 000049B1 7407                <1> 	JZ	short CMD_O4			; COUNT = 0  OK
  5019 000049B3 C605[5B590100]BB    <1> 	MOV	byte [DISK_STATUS1],UNDEF_ERR 
  5020                              <1> 					; OPERATION ABORTED - PARTIAL TRANSFER
  5021                              <1> CMD_O4:
  5022 000049BA C3                  <1> 	RETn
  5023                              <1> 
  5024                              <1> ;--------------------------------------------------------
  5025                              <1> ; COMMAND						:
  5026                              <1> ;	THIS ROUTINE OUTPUTS THE COMMAND BLOCK		:
  5027                              <1> ; OUTPUT						:
  5028                              <1> ;	BL = STATUS					:
  5029                              <1> ;	BH = ERROR REGISTER				:
  5030                              <1> ;--------------------------------------------------------
  5031                              <1> 
  5032                              <1> COMMAND:
  5033 000049BB 53                  <1> 	PUSH	eBX			; WAIT FOR SEEK COMPLETE AND READY
  5034                              <1> 	;;MOV	CX,DELAY_2		; SET INITIAL DELAY BEFORE TEST
  5035                              <1> COMMAND1:
  5036                              <1> 	;;PUSH	CX			; SAVE LOOP COUNT
  5037 000049BC E879FEFFFF          <1> 	CALL	TST_RDY 		; CHECK DRIVE READY
  5038                              <1> 	;;POP	CX
  5039 000049C1 7419                <1> 	JZ	short COMMAND2		; DRIVE IS READY
  5040 000049C3 803D[5B590100]80    <1>         CMP     byte [DISK_STATUS1],TIME_OUT ; TST_RDY TIMED OUT--GIVE UP
  5041                              <1> 	;JZ	short CMD_TIMEOUT
  5042                              <1> 	;;LOOP	COMMAND1		; KEEP TRYING FOR A WHILE
  5043                              <1> 	;JMP	SHORT COMMAND4		; ITS NOT GOING TO GET READY
  5044 000049CA 7507                <1> 	jne	short COMMAND4
  5045                              <1> CMD_TIMEOUT:
  5046 000049CC C605[5B590100]20    <1> 	MOV	byte [DISK_STATUS1],BAD_CNTLR
  5047                              <1> COMMAND4:
  5048 000049D3 5B                  <1> 	POP	eBX
  5049 000049D4 803D[5B590100]00    <1>         CMP     byte [DISK_STATUS1],0   ; SET CONDITION CODE FOR CALLER
  5050 000049DB C3                  <1> 	RETn
  5051                              <1> COMMAND2:
  5052 000049DC 5B                  <1> 	POP	eBX
  5053 000049DD 57                  <1> 	PUSH	eDI
  5054 000049DE C605[53590100]00    <1> 	MOV	byte [HF_INT_FLAG],0	; RESET INTERRUPT FLAG
  5055 000049E5 FA                  <1> 	CLI				; INHIBIT INTERRUPTS WHILE CHANGING MASK
  5056 000049E6 E4A1                <1> 	IN	AL,INTB01		; TURN ON SECOND INTERRUPT CHIP
  5057                              <1> 	;AND	AL,0BFH
  5058 000049E8 243F                <1> 	and	al, 3Fh			; Enable IRQ 14 & 15
  5059                              <1> 	;JMP	$+2
  5060                              <1> 	IODELAY
  5060 000049EA EB00                <2>  jmp short $+2
  5060 000049EC EB00                <2>  jmp short $+2
  5061 000049EE E6A1                <1> 	OUT	INTB01,AL
  5062 000049F0 E421                <1> 	IN	AL,INTA01		; LET INTERRUPTS PASS THRU TO
  5063 000049F2 24FB                <1> 	AND	AL,0FBH 		;  SECOND CHIP
  5064                              <1> 	;JMP	$+2
  5065                              <1> 	IODELAY
  5065 000049F4 EB00                <2>  jmp short $+2
  5065 000049F6 EB00                <2>  jmp short $+2
  5066 000049F8 E621                <1> 	OUT	INTA01,AL
  5067 000049FA FB                  <1> 	STI
  5068 000049FB 31FF                <1> 	XOR	eDI,eDI			; INDEX THE COMMAND TABLE
  5069                              <1> 	;MOV	DX,HF_PORT+1		; DISK ADDRESS
  5070 000049FD 668B15[485D0000]    <1> 	mov	dx, [HF_PORT]
  5071 00004A04 FEC2                <1> 	inc	dl
  5072 00004A06 F605[5D590100]C0    <1> 	TEST	byte [CONTROL_BYTE],0C0H ; CHECK FOR RETRY SUPPRESSION
  5073 00004A0D 7411                <1> 	JZ	short COMMAND3
  5074 00004A0F 8A45FE              <1> 	MOV	AL, [CMD_BLOCK+6] 	; YES-GET OPERATION CODE
  5075 00004A12 24F0                <1> 	AND	AL,0F0H 		; GET RID OF MODIFIERS
  5076 00004A14 3C20                <1> 	CMP	AL,20H			; 20H-40H IS READ, WRITE, VERIFY
  5077 00004A16 7208                <1> 	JB	short COMMAND3
  5078 00004A18 3C40                <1> 	CMP	AL,40H
  5079 00004A1A 7704                <1> 	JA	short COMMAND3
  5080 00004A1C 804DFE01            <1> 	OR	byte [CMD_BLOCK+6],NO_RETRIES 
  5081                              <1> 					; VALID OPERATION FOR RETRY SUPPRESS
  5082                              <1> COMMAND3:
  5083 00004A20 8A443DF8            <1> 	MOV	AL,[CMD_BLOCK+eDI]	; GET THE COMMAND STRING BYTE
  5084 00004A24 EE                  <1> 	OUT	DX,AL			; GIVE IT TO CONTROLLER
  5085                              <1> 	IODELAY
  5085 00004A25 EB00                <2>  jmp short $+2
  5085 00004A27 EB00                <2>  jmp short $+2
  5086 00004A29 47                  <1> 	INC	eDI			; NEXT BYTE IN COMMAND BLOCK
  5087 00004A2A 6642                <1> 	INC	DX			; NEXT DISK ADAPTER REGISTER
  5088 00004A2C 6683FF07            <1> 	cmp	di, 7	; 1/1/2015	; ALL DONE?
  5089 00004A30 75EE                <1> 	JNZ	short COMMAND3		; NO--GO DO NEXT ONE
  5090 00004A32 5F                  <1> 	POP	eDI
  5091 00004A33 C3                  <1> 	RETn				; ZERO FLAG IS SET
  5092                              <1> 
  5093                              <1> ;CMD_TIMEOUT:
  5094                              <1> ;	MOV	byte [DISK_STATUS1],BAD_CNTLR
  5095                              <1> ;COMMAND4:
  5096                              <1> ;	POP	BX
  5097                              <1> ;	CMP	[DISK_STATUS1],0 	; SET CONDITION CODE FOR CALLER
  5098                              <1> ;	RETn
  5099                              <1> 
  5100                              <1> ;----------------------------------------
  5101                              <1> ;	WAIT FOR INTERRUPT		:
  5102                              <1> ;----------------------------------------
  5103                              <1> ;WAIT:
  5104                              <1> _WAIT:
  5105 00004A34 FB                  <1> 	STI				; MAKE SURE INTERRUPTS ARE ON
  5106                              <1> 	;SUB	CX,CX			; SET INITIAL DELAY BEFORE TEST
  5107                              <1> 	;CLC
  5108                              <1> 	;MOV	AX,9000H		; DEVICE WAIT INTERRUPT
  5109                              <1> 	;INT	15H
  5110                              <1> 	;JC	WT2			; DEVICE TIMED OUT
  5111                              <1> 	;MOV	BL,DELAY_1		; SET DELAY COUNT
  5112                              <1> 
  5113                              <1> 	;mov	bl, WAIT_HDU_INT_HI
  5114                              <1> 	;; 21/02/2015
  5115                              <1> 	;;mov	bl, WAIT_HDU_INT_HI + 1
  5116                              <1> 	;;mov	cx, WAIT_HDU_INT_LO
  5117 00004A35 B915160500          <1> 	mov	ecx, WAIT_HDU_INT_LH
  5118                              <1> 					; (AWARD BIOS -> WAIT_FOR_MEM)
  5119                              <1> ;-----	WAIT LOOP
  5120                              <1> 
  5121                              <1> WT1:	
  5122                              <1> 	;TEST	byte [HF_INT_FLAG],80H	; TEST FOR INTERRUPT
  5123 00004A3A F605[53590100]C0    <1> 	test 	byte [HF_INT_FLAG],0C0h
  5124                              <1> 	;LOOPZ	WT1
  5125 00004A41 7517                <1> 	JNZ	short WT3		; INTERRUPT--LETS GO
  5126                              <1> 	;DEC	BL
  5127                              <1> 	;JNZ	short WT1		; KEEP TRYING FOR A WHILE
  5128                              <1> 
  5129                              <1> WT1_hi:
  5130 00004A43 E461                <1> 	in	al, SYS1 ; 61h (PORT_B)	; wait for lo to hi
  5131 00004A45 A810                <1> 	test	al, 10h			; transition on memory
  5132 00004A47 75FA                <1> 	jnz	short WT1_hi		; refresh.
  5133                              <1> WT1_lo:
  5134 00004A49 E461                <1> 	in	al, SYS1 		; 061h (PORT_B)	
  5135 00004A4B A810                <1> 	test	al, 10h			
  5136 00004A4D 74FA                <1> 	jz	short WT1_lo
  5137 00004A4F E2E9                <1> 	loop	WT1
  5138                              <1> 	;;or	bl, bl
  5139                              <1> 	;;jz	short WT2	
  5140                              <1> 	;;dec	bl
  5141                              <1> 	;;jmp	short WT1
  5142                              <1> 	;dec	bl
  5143                              <1> 	;jnz	short WT1	
  5144                              <1> 
  5145 00004A51 C605[5B590100]80    <1> WT2:	MOV	byte [DISK_STATUS1],TIME_OUT ; REPORT TIME OUT ERROR
  5146 00004A58 EB0E                <1> 	JMP	SHORT WT4
  5147 00004A5A C605[5B590100]00    <1> WT3:	MOV	byte [DISK_STATUS1],0
  5148 00004A61 C605[53590100]00    <1> 	MOV	byte [HF_INT_FLAG],0
  5149 00004A68 803D[5B590100]00    <1> WT4:	CMP	byte [DISK_STATUS1],0 	; SET CONDITION CODE FOR CALLER
  5150 00004A6F C3                  <1> 	RETn
  5151                              <1> 
  5152                              <1> ;----------------------------------------
  5153                              <1> ;	WAIT FOR CONTROLLER NOT BUSY	:
  5154                              <1> ;----------------------------------------
  5155                              <1> NOT_BUSY:
  5156 00004A70 FB                  <1> 	STI				; MAKE SURE INTERRUPTS ARE ON
  5157                              <1> 	;PUSH	eBX
  5158                              <1> 	;SUB	CX,CX			; SET INITIAL DELAY BEFORE TEST
  5159 00004A71 668B15[485D0000]    <1> 	mov	DX, [HF_PORT]
  5160 00004A78 80C207              <1> 	add	dl, 7			; Status port (HF_PORT+7)
  5161                              <1> 	;MOV	BL,DELAY_1
  5162                              <1> 					; wait for 10 seconds
  5163                              <1> 	;mov 	cx, WAIT_HDU_INT_LO	; 1615h
  5164                              <1> 	;;mov 	bl, WAIT_HDU_INT_HI	;   05h
  5165                              <1> 	;mov	bl, WAIT_HDU_INT_HI + 1
  5166 00004A7B B915160500          <1> 	mov	ecx, WAIT_HDU_INT_LH  ; 21/02/2015
  5167                              <1> 	;
  5168                              <1> ;;      mov     byte [wait_count], 0    ; Reset wait counter
  5169                              <1> NB1:	
  5170 00004A80 EC                  <1> 	IN	AL,DX			; CHECK STATUS
  5171                              <1> 	;TEST	AL,ST_BUSY
  5172 00004A81 2480                <1> 	and	al, ST_BUSY
  5173                              <1> 	;LOOPNZ	NB1
  5174 00004A83 7410                <1> 	JZ	short NB2		; NOT BUSY--LETS GO
  5175                              <1> 	;DEC	BL			
  5176                              <1> 	;JNZ	short NB1		; KEEP TRYING FOR A WHILE
  5177                              <1> 
  5178 00004A85 E461                <1> NB1_hi: IN	AL,SYS1			; wait for hi to lo
  5179 00004A87 A810                <1> 	TEST	AL,010H			; transition on memory
  5180 00004A89 75FA                <1> 	JNZ	SHORT NB1_hi		; refresh.
  5181 00004A8B E461                <1> NB1_lo: IN	AL,SYS1
  5182 00004A8D A810                <1> 	TEST	AL,010H
  5183 00004A8F 74FA                <1> 	JZ	short NB1_lo
  5184 00004A91 E2ED                <1> 	LOOP	NB1
  5185                              <1> 	;dec	bl
  5186                              <1> 	;jnz	short NB1
  5187                              <1> 	;
  5188                              <1> ;;      cmp     byte [wait_count], 182  ; 10 seconds (182 timer ticks)
  5189                              <1> ;;	jb	short NB1
  5190                              <1> 	;
  5191                              <1> 	;MOV	[DISK_STATUS1],TIME_OUT	; REPORT TIME OUT ERROR
  5192                              <1> 	;JMP	SHORT NB3
  5193 00004A93 B080                <1> 	mov	al, TIME_OUT
  5194                              <1> NB2:	
  5195                              <1> 	;MOV	byte [DISK_STATUS1],0
  5196                              <1> ;NB3:	
  5197                              <1> 	;POP	eBX
  5198 00004A95 A2[5B590100]        <1> 	mov	[DISK_STATUS1], al	;;; will be set after return
  5199                              <1> 	;CMP	byte [DISK_STATUS1],0 	; SET CONDITION CODE FOR CALLER
  5200 00004A9A 08C0                <1> 	or	al, al			; (zf = 0 --> timeout)
  5201 00004A9C C3                  <1> 	RETn
  5202                              <1> 
  5203                              <1> ;----------------------------------------
  5204                              <1> ;	WAIT FOR DATA REQUEST		:
  5205                              <1> ;----------------------------------------
  5206                              <1> WAIT_DRQ:
  5207                              <1> 	;MOV	CX,DELAY_3
  5208                              <1> 	;MOV	DX,HF_PORT+7
  5209 00004A9D 668B15[485D0000]    <1> 	mov	dx, [HF_PORT]
  5210 00004AA4 80C207              <1> 	add	dl, 7
  5211                              <1> 	;;MOV	bl, WAIT_HDU_DRQ_HI	; 0
  5212                              <1> 	;MOV	cx, WAIT_HDU_DRQ_LO	; 1000 (30 milli seconds)
  5213                              <1> 					; (but it is written as 2000
  5214                              <1> 					; micro seconds in ATORGS.ASM file
  5215                              <1> 					; of Award Bios - 1999, D1A0622)
  5216 00004AA7 B9E8030000          <1> 	mov 	ecx, WAIT_HDU_DRQ_LH ; 21/02/2015 
  5217 00004AAC EC                  <1> WQ_1:	IN	AL,DX			; GET STATUS
  5218 00004AAD A808                <1> 	TEST	AL,ST_DRQ		; WAIT FOR DRQ
  5219 00004AAF 7516                <1> 	JNZ	short WQ_OK
  5220                              <1> 	;LOOP	WQ_1			; KEEP TRYING FOR A SHORT WHILE
  5221                              <1> WQ_hi:	
  5222 00004AB1 E461                <1> 	IN	AL,SYS1			; wait for hi to lo
  5223 00004AB3 A810                <1> 	TEST	AL,010H			; transition on memory
  5224 00004AB5 75FA                <1> 	JNZ	SHORT WQ_hi		; refresh.
  5225 00004AB7 E461                <1> WQ_lo:  IN      AL,SYS1
  5226 00004AB9 A810                <1> 	TEST	AL,010H
  5227 00004ABB 74FA                <1> 	JZ	SHORT WQ_lo
  5228 00004ABD E2ED                <1> 	LOOP	WQ_1
  5229                              <1> 
  5230 00004ABF C605[5B590100]80    <1>         MOV     byte [DISK_STATUS1],TIME_OUT ; ERROR
  5231 00004AC6 F9                  <1> 	STC
  5232                              <1> WQ_OK:
  5233 00004AC7 C3                  <1> 	RETn
  5234                              <1> ;WQ_OK:	;CLC
  5235                              <1> ;	RETn
  5236                              <1> 
  5237                              <1> ;----------------------------------------
  5238                              <1> ;	CHECK FIXED DISK STATUS 	:
  5239                              <1> ;----------------------------------------
  5240                              <1> CHECK_STATUS:
  5241 00004AC8 E813000000          <1> 	CALL	CHECK_ST		; CHECK THE STATUS BYTE
  5242 00004ACD 7509                <1> 	JNZ	short CHECK_S1		; AN ERROR WAS FOUND
  5243 00004ACF A801                <1> 	TEST	AL,ST_ERROR		; WERE THERE ANY OTHER ERRORS
  5244 00004AD1 7405                <1> 	JZ	short CHECK_S1		; NO ERROR REPORTED
  5245 00004AD3 E849000000          <1> 	CALL	CHECK_ER		; ERROR REPORTED
  5246                              <1> CHECK_S1:
  5247 00004AD8 803D[5B590100]00    <1> 	CMP	byte [DISK_STATUS1],0 	; SET STATUS FOR CALLER
  5248 00004ADF C3                  <1> 	RETn
  5249                              <1> 
  5250                              <1> ;----------------------------------------
  5251                              <1> ;	CHECK FIXED DISK STATUS BYTE	:
  5252                              <1> ;----------------------------------------
  5253                              <1> CHECK_ST:
  5254                              <1> 	;MOV	DX,HF_PORT+7		; GET THE STATUS
  5255 00004AE0 668B15[485D0000]    <1> 	mov	dx, [HF_PORT]
  5256 00004AE7 80C207              <1> 	add	dl, 7
  5257                              <1> 	
  5258                              <1> 	; 17/02/2016
  5259                              <1> 	;(http://wiki.osdev.org/ATA_PIO_Mode)
  5260                              <1> 	;"delay 400ns to allow drive to set new values of BSY and DRQ"
  5261 00004AEA EC                  <1> 	IN	AL,DX
  5262                              <1> 	;in	al, dx ; 100ns
  5263                              <1> 	;in	al, dx ; 100ns
  5264                              <1>  	;in	al, dx ; 100ns
  5265                              <1> 	NEWIODELAY ; 18/02/2016 (AWARD BIOS - 1999, 'CKST' in AHSDK.ASM)
  5265 00004AEB E6EB                <2>  out 0ebh,al
  5266                              <1> 	;
  5267 00004AED A2[51590100]        <1> 	MOV	[HF_STATUS],AL
  5268 00004AF2 B400                <1> 	MOV	AH,0
  5269 00004AF4 A880                <1> 	TEST	AL,ST_BUSY		; IF STILL BUSY
  5270 00004AF6 751A                <1> 	JNZ	short CKST_EXIT		;  REPORT OK
  5271 00004AF8 B4CC                <1> 	MOV	AH,WRITE_FAULT
  5272 00004AFA A820                <1> 	TEST	AL,ST_WRT_FLT		; CHECK FOR WRITE FAULT
  5273 00004AFC 7514                <1> 	JNZ	short CKST_EXIT
  5274 00004AFE B4AA                <1> 	MOV	AH,NOT_RDY
  5275 00004B00 A840                <1> 	TEST	AL,ST_READY		; CHECK FOR NOT READY
  5276 00004B02 740E                <1> 	JZ	short CKST_EXIT
  5277 00004B04 B440                <1> 	MOV	AH,BAD_SEEK
  5278 00004B06 A810                <1> 	TEST	AL,ST_SEEK_COMPL	; CHECK FOR SEEK NOT COMPLETE
  5279 00004B08 7408                <1> 	JZ	short CKST_EXIT
  5280 00004B0A B411                <1> 	MOV	AH,DATA_CORRECTED
  5281 00004B0C A804                <1> 	TEST	AL,ST_CORRCTD		; CHECK FOR CORRECTED ECC
  5282 00004B0E 7502                <1> 	JNZ	short CKST_EXIT
  5283 00004B10 B400                <1> 	MOV	AH,0
  5284                              <1> CKST_EXIT:
  5285 00004B12 8825[5B590100]      <1> 	MOV	[DISK_STATUS1],AH	; SET ERROR FLAG
  5286 00004B18 80FC11              <1> 	CMP	AH,DATA_CORRECTED	; KEEP GOING WITH DATA CORRECTED
  5287 00004B1B 7403                <1> 	JZ	short CKST_EX1
  5288 00004B1D 80FC00              <1> 	CMP	AH,0
  5289                              <1> CKST_EX1:
  5290 00004B20 C3                  <1> 	RETn
  5291                              <1> 
  5292                              <1> ;----------------------------------------
  5293                              <1> ;	CHECK FIXED DISK ERROR REGISTER :
  5294                              <1> ;----------------------------------------
  5295                              <1> CHECK_ER:
  5296                              <1> 	;MOV	DX, HF_PORT+1		; GET THE ERROR REGISTER
  5297 00004B21 668B15[485D0000]    <1> 	mov	dx, [HF_PORT]		;
  5298 00004B28 FEC2                <1> 	inc	dl
  5299 00004B2A EC                  <1> 	IN	AL,DX
  5300 00004B2B A2[52590100]        <1> 	MOV	[HF_ERROR],AL
  5301 00004B30 53                  <1> 	PUSH	eBX ; 21/02/2015
  5302 00004B31 B908000000          <1> 	MOV	eCX,8			; TEST ALL 8 BITS
  5303 00004B36 D0E0                <1> CK1:	SHL	AL,1			; MOVE NEXT ERROR BIT TO CARRY
  5304 00004B38 7202                <1> 	JC	short CK2		; FOUND THE ERROR
  5305 00004B3A E2FA                <1> 	LOOP	CK1			; KEEP TRYING
  5306 00004B3C BB[3C5D0000]        <1> CK2:	MOV	eBX, ERR_TBL		; COMPUTE ADDRESS OF
  5307 00004B41 01CB                <1> 	ADD	eBX,eCX			; ERROR CODE
  5308                              <1> 	;;MOV	AH,BYTE [CS:BX]		; GET ERROR CODE
  5309                              <1> 	;mov	ah, [bx]
  5310 00004B43 8A23                <1> 	mov	ah, [ebx] ; 21/02/2015	
  5311 00004B45 8825[5B590100]      <1> CKEX:	MOV	[DISK_STATUS1],AH	; SAVE ERROR CODE
  5312 00004B4B 5B                  <1> 	POP	eBX
  5313 00004B4C 80FC00              <1> 	CMP	AH,0
  5314 00004B4F C3                  <1> 	RETn
  5315                              <1> 
  5316                              <1> ;--------------------------------------------------------
  5317                              <1> ; CHECK_DMA						:
  5318                              <1> ;  -CHECK ES:BX AND # SECTORS TO MAKE SURE THAT IT WILL :
  5319                              <1> ;   FIT WITHOUT SEGMENT OVERFLOW.			:
  5320                              <1> ;  -ES:BX HAS BEEN REVISED TO THE FORMAT SSSS:000X	:
  5321                              <1> ;  -OK IF # SECTORS < 80H (7FH IF LONG READ OR WRITE)	:
  5322                              <1> ;  -OK IF # SECTORS = 80H (7FH) AND BX <= 00H (04H)	:
  5323                              <1> ;  -ERROR OTHERWISE					:
  5324                              <1> ;--------------------------------------------------------
  5325                              <1> CHECK_DMA:
  5326 00004B50 6650                <1> 	PUSH	AX			; SAVE REGISTERS
  5327 00004B52 66B80080            <1> 	MOV	AX,8000H		; AH = MAX # SECTORS AL = MAX OFFSET
  5328 00004B56 F645FE02            <1>         TEST    byte [CMD_BLOCK+6],ECC_MODE
  5329 00004B5A 7404                <1> 	JZ	short CKD1
  5330 00004B5C 66B8047F            <1> 	MOV	AX,7F04H		; ECC IS 4 MORE BYTES
  5331 00004B60 3A65F9              <1> CKD1:	CMP	AH, [CMD_BLOCK+1] 	; NUMBER OF SECTORS
  5332 00004B63 7706                <1> 	JA	short CKDOK		; IT WILL FIT
  5333 00004B65 7208                <1> 	JB	short CKDERR		; TOO MANY
  5334 00004B67 38D8                <1> 	CMP	AL,BL			; CHECK OFFSET ON MAX SECTORS
  5335 00004B69 7204                <1> 	JB	short CKDERR		; ERROR
  5336 00004B6B F8                  <1> CKDOK:	CLC				; CLEAR CARRY
  5337 00004B6C 6658                <1> 	POP	AX
  5338 00004B6E C3                  <1> 	RETn				; NORMAL RETURN
  5339 00004B6F F9                  <1> CKDERR: STC				; INDICATE ERROR
  5340 00004B70 C605[5B590100]09    <1>         MOV     byte [DISK_STATUS1],DMA_BOUNDARY
  5341 00004B77 6658                <1> 	POP	AX
  5342 00004B79 C3                  <1> 	RETn
  5343                              <1> 
  5344                              <1> ;----------------------------------------
  5345                              <1> ;	SET UP ES:BX-> DISK PARMS	:
  5346                              <1> ;----------------------------------------
  5347                              <1> 					
  5348                              <1> ; INPUT -> DL = 0 based drive number
  5349                              <1> ; OUTPUT -> ES:BX = disk parameter table address
  5350                              <1> 
  5351                              <1> GET_VEC:
  5352                              <1> 	;SUB	AX,AX			; GET DISK PARAMETER ADDRESS
  5353                              <1> 	;MOV	ES,AX
  5354                              <1> 	;TEST	DL,1
  5355                              <1> 	;JZ	short GV_0
  5356                              <1> ;	LES	BX,[HF1_TBL_VEC] 	; ES:BX -> DRIVE PARAMETERS
  5357                              <1> ;	JMP	SHORT GV_EXIT
  5358                              <1> ;GV_0:
  5359                              <1> ;	LES	BX,[HF_TBL_VEC]		; ES:BX -> DRIVE PARAMETERS
  5360                              <1> ;
  5361                              <1> 	;xor	bh, bh
  5362 00004B7A 31DB                <1> 	xor	ebx, ebx
  5363 00004B7C 88D3                <1> 	mov	bl, dl
  5364                              <1> 	;;02/01/2015
  5365                              <1> 	;;shl	bl, 1			; port address offset
  5366                              <1> 	;;mov	ax, [bx+hd_ports]	; Base port address (1F0h, 170h)
  5367                              <1> 	;;shl	bl, 1			; dpt pointer offset
  5368 00004B7E C0E302              <1> 	shl	bl, 2	;;
  5369                              <1> 	;add	bx, HF_TBL_VEC		; Disk parameter table pointer
  5370 00004B81 81C3[60590100]      <1> 	add	ebx, HF_TBL_VEC ; 21/02/2015
  5371                              <1> 	;push	word [bx+2]		; dpt segment
  5372                              <1> 	;pop	es
  5373                              <1> 	;mov	bx, [bx]		; dpt offset
  5374 00004B87 8B1B                <1> 	mov	ebx, [ebx]		
  5375                              <1> ;GV_EXIT:
  5376 00004B89 C3                  <1> 	RETn
  5377                              <1> 
  5378                              <1> hdc1_int: ; 21/02/2015
  5379                              <1> ;--- HARDWARE INT 76H -- ( IRQ LEVEL  14 ) ----------------------
  5380                              <1> ;								:
  5381                              <1> ;	FIXED DISK INTERRUPT ROUTINE				:
  5382                              <1> ;								:
  5383                              <1> ;----------------------------------------------------------------
  5384                              <1> 
  5385                              <1> ; 22/12/2014
  5386                              <1> ; IBM PC-XT Model 286 System BIOS Source Code - DISK.ASM (HD_INT)
  5387                              <1> ;	 '11/15/85'
  5388                              <1> ; AWARD BIOS 1999 (D1A0622) 
  5389                              <1> ;	Source Code - ATORGS.ASM (INT_HDISK, INT_HDISK1)
  5390                              <1> 
  5391                              <1> ;int_76h:
  5392                              <1> HD_INT:
  5393 00004B8A 6650                <1> 	PUSH	AX
  5394 00004B8C 1E                  <1> 	PUSH	DS
  5395                              <1> 	;CALL	DDS
  5396                              <1> 	; 21/02/2015 (32 bit, 386 pm modification)
  5397 00004B8D 66B81000            <1> 	mov	ax, KDATA
  5398 00004B91 8ED8                <1> 	mov 	ds, ax
  5399                              <1> 	;
  5400                              <1> 	;;MOV	@HF_INT_FLAG,0FFH	; ALL DONE
  5401                              <1>         ;mov     byte [CS:HF_INT_FLAG], 0FFh
  5402 00004B93 C605[53590100]FF    <1> 	mov	byte [HF_INT_FLAG], 0FFh
  5403                              <1> 	;
  5404 00004B9A 6652                <1> 	push	dx
  5405 00004B9C 66BAF701            <1> 	mov	dx, HDC1_BASEPORT+7	; Status Register (1F7h)
  5406                              <1> 					; Clear Controller
  5407                              <1> Clear_IRQ1415:				; (Award BIOS - 1999)
  5408 00004BA0 EC                  <1> 	in	al, dx			;
  5409 00004BA1 665A                <1> 	pop	dx
  5410                              <1> 	NEWIODELAY
  5410 00004BA3 E6EB                <2>  out 0ebh,al
  5411                              <1> 	;
  5412 00004BA5 B020                <1> 	MOV	AL,EOI			; NON-SPECIFIC END OF INTERRUPT
  5413 00004BA7 E6A0                <1> 	OUT	INTB00,AL		; FOR CONTROLLER #2
  5414                              <1> 	;JMP	$+2			; WAIT
  5415                              <1> 	NEWIODELAY
  5415 00004BA9 E6EB                <2>  out 0ebh,al
  5416 00004BAB E620                <1> 	OUT	INTA00,AL		; FOR CONTROLLER #1
  5417 00004BAD 1F                  <1> 	POP	DS
  5418                              <1> 	;STI				; RE-ENABLE INTERRUPTS
  5419                              <1> 	;MOV	AX,9100H		; DEVICE POST
  5420                              <1> 	;INT	15H			;  INTERRUPT
  5421                              <1> irq15_iret: ; 25/02/2015
  5422 00004BAE 6658                <1> 	POP	AX
  5423 00004BB0 CF                  <1> 	IRETd				; RETURN FROM INTERRUPT
  5424                              <1> 
  5425                              <1> hdc2_int: ; 21/02/2015
  5426                              <1> ;++++ HARDWARE INT 77H ++ ( IRQ LEVEL  15 ) +++++++++++++++++++++
  5427                              <1> ;								:
  5428                              <1> ;	FIXED DISK INTERRUPT ROUTINE				:
  5429                              <1> ;								:
  5430                              <1> ;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  5431                              <1> 
  5432                              <1> ;int_77h:
  5433                              <1> HD1_INT:
  5434 00004BB1 6650                <1> 	PUSH	AX
  5435                              <1> 	; Check if that is a spurious IRQ (from slave PIC)
  5436                              <1> 	; 25/02/2015 (source: http://wiki.osdev.org/8259_PIC)
  5437 00004BB3 B00B                <1> 	mov	al, 0Bh  ; In-Service Register
  5438 00004BB5 E6A0                <1> 	out	0A0h, al
  5439 00004BB7 EB00                <1>         jmp short $+2
  5440 00004BB9 EB00                <1> 	jmp short $+2
  5441 00004BBB E4A0                <1> 	in	al, 0A0h
  5442 00004BBD 2480                <1> 	and 	al, 80h ; bit 7 (is it real IRQ 15 or fake?)
  5443 00004BBF 74ED                <1> 	jz	short irq15_iret ; Fake (spurious)IRQ, do not send EOI)
  5444                              <1> 	;
  5445 00004BC1 1E                  <1> 	PUSH	DS
  5446                              <1> 	;CALL	DDS
  5447                              <1> 	; 21/02/2015 (32 bit, 386 pm modification)
  5448 00004BC2 66B81000            <1> 	mov	ax, KDATA
  5449 00004BC6 8ED8                <1> 	mov 	ds, ax
  5450                              <1> 	;
  5451                              <1> 	;;MOV	@HF_INT_FLAG,0FFH	; ALL DONE
  5452                              <1>         ;or      byte [CS:HF_INT_FLAG],0C0h 
  5453 00004BC8 800D[53590100]C0    <1> 	or	byte [HF_INT_FLAG], 0C0h
  5454                              <1> 	;
  5455 00004BCF 6652                <1> 	push	dx
  5456 00004BD1 66BA7701            <1> 	mov	dx, HDC2_BASEPORT+7	; Status Register (177h)
  5457                              <1> 					; Clear Controller (Award BIOS 1999)
  5458 00004BD5 EBC9                <1> 	jmp	short Clear_IRQ1415
  5459                              <1> 
  5460                              <1> 
  5461                              <1> ;%include 'diskdata.inc' ; 11/03/2015
  5462                              <1> ;%include 'diskbss.inc' ; 11/03/2015
  5463                              <1> 
  5464                              <1> 
  5465                              <1> ;////////////////////////////////////////////////////////////////////
  5466                              <1> ;; END OF DISK I/O SYTEM ///
  2159                                  %include 'memory.s'  ; 09/03/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - memory.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 22/07/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; memory.inc (18/10/2015)
    15                              <1> ; ****************************************************************************
    16                              <1> 
    17                              <1> ; MEMORY.ASM - Retro UNIX 386 v1 MEMORY MANAGEMENT FUNCTIONS (PROCEDURES)
    18                              <1> ; Retro UNIX 386 v1 Kernel (unix386.s, v0.2.0.14) - MEMORY.INC
    19                              <1> ; Last Modification: 18/10/2015
    20                              <1> 
    21                              <1> ; ///////// MEMORY MANAGEMENT FUNCTIONS (PROCEDURES) ///////////////
    22                              <1> 
    23                              <1> ;;04/11/2014 (unix386.s)	
    24                              <1> ;PDE_A_PRESENT	equ	1		; Present flag for PDE
    25                              <1> ;PDE_A_WRITE	equ 	2		; Writable (write permission) flag
    26                              <1> ;PDE_A_USER	equ	4		; User (non-system/kernel) page flag
    27                              <1> ;;
    28                              <1> ;PTE_A_PRESENT	equ	1		; Present flag for PTE (bit 0)
    29                              <1> ;PTE_A_WRITE	equ 	2		; Writable (write permission) flag (bit 1)
    30                              <1> ;PTE_A_USER	equ	4		; User (non-system/kernel) page flag (bit 2)
    31                              <1> ;PTE_A_ACCESS   equ	32		; Accessed flag (bit 5) ; 09/03/2015
    32                              <1> 
    33                              <1> ; 27/04/2015
    34                              <1> ; 09/03/2015
    35                              <1> PAGE_SIZE 	equ 4096		; page size in bytes
    36                              <1> PAGE_SHIFT 	equ 12			; page table shift count
    37                              <1> PAGE_D_SHIFT 	equ 22	; 12 + 10	; page directory shift count
    38                              <1> PAGE_OFF	equ 0FFFh		; 12 bit byte offset in page frame
    39                              <1> PTE_MASK 	equ 03FFh		; page table entry mask
    40                              <1> PTE_DUPLICATED  equ 200h		; duplicated page sign (AVL bit 0)
    41                              <1> PDE_A_CLEAR	equ 0F000h		; to clear PDE attribute bits
    42                              <1> PTE_A_CLEAR	equ 0F000h		; to clear PTE attribute bits
    43                              <1> LOGIC_SECT_SIZE equ 512			; logical sector size
    44                              <1> ERR_MAJOR_PF	equ 0E0h		; major error: page fault
    45                              <1> ERR_MINOR_IM	equ 4 ;15/10/2016 (1->4); insufficient (out of) memory
    46                              <1> ERR_MINOR_PV	equ 6 ;15/10/2016 (1->4); protection violation
    47                              <1> SWP_DISK_READ_ERR 	   equ 40
    48                              <1> SWP_DISK_NOT_PRESENT_ERR   equ 41
    49                              <1> SWP_SECTOR_NOT_PRESENT_ERR equ 42
    50                              <1> SWP_NO_FREE_SPACE_ERR      equ 43
    51                              <1> SWP_DISK_WRITE_ERR         equ 44
    52                              <1> SWP_NO_PAGE_TO_SWAP_ERR    equ 45
    53                              <1> PTE_A_ACCESS_BIT equ 5  ; Bit 5 (accessed flag)        
    54                              <1> SECTOR_SHIFT     equ 3  ; sector shift (to convert page block number)
    55                              <1> ; 12/07/2016
    56                              <1> PTE_SHARED	 equ 400h		; AVL bit 1, direct memory access bit	
    57                              <1> 					; (Indicates that the page is not allocated
    58                              <1> 					; for the process, it is a shared or system
    59                              <1>                                         ; page, it must not be deallocated!)
    60                              <1> ;
    61                              <1> ;; Retro Unix 386 v1 - paging method/principles
    62                              <1> ;;
    63                              <1> ;; 10/10/2014
    64                              <1> ;; RETRO UNIX 386 v1 - PAGING METHOD/PRINCIPLES
    65                              <1> ;;
    66                              <1> ;; KERNEL PAGE MAP: 1 to 1 physical memory page map
    67                              <1> ;;	(virtual address = physical address)
    68                              <1> ;; KERNEL PAGE TABLES:
    69                              <1> ;;	Kernel page directory and all page tables are
    70                              <1> ;;	on memory as initialized, as equal to physical memory
    71                              <1> ;;	layout. Kernel pages can/must not be swapped out/in.
    72                              <1> ;;
    73                              <1> ;;	what for: User pages may be swapped out, when accessing
    74                              <1> ;;	a page in kernel/system mode, if it would be swapped out,
    75                              <1> ;;	kernel would have to swap it in! But it is also may be
    76                              <1> ;;	in use by a user process. (In system/kernel mode
    77                              <1> ;;	kernel can access all memory pages even if they are
    78                              <1> ;;	reserved/allocated for user processes. Swap out/in would
    79                              <1> ;;	cause conflicts.) 
    80                              <1> ;;	
    81                              <1> ;;	As result of these conditions,
    82                              <1> ;;	all kernel pages must be initialized as equal to 
    83                              <1> ;;	physical layout for preventing page faults. 
    84                              <1> ;;	Also, calling "allocate page" procedure after
    85                              <1> ;;	a page fault can cause another page fault (double fault)
    86                              <1> ;;	if all kernel page tables would not be initialized.
    87                              <1> ;;
    88                              <1> ;;	[first_page] = Beginning of users space, as offset to 
    89                              <1> ;;	memory allocation table. (double word aligned)
    90                              <1> ;;
    91                              <1> ;;	[next_page] = first/next free space to be searched
    92                              <1> ;;	as offset to memory allocation table. (dw aligned)
    93                              <1> ;;
    94                              <1> ;;	[last_page] = End of memory (users space), as offset
    95                              <1> ;;	to memory allocation table. (double word aligned)
    96                              <1> ;;
    97                              <1> ;; USER PAGE TABLES:
    98                              <1> ;;	Demand paging (& 'copy on write' allocation method) ...
    99                              <1> ;;		'ready only' marked copies of the 
   100                              <1> ;;		parent process's page table entries (for
   101                              <1> ;;		same physical memory).
   102                              <1> ;;		(A page will be copied to a new page after
   103                              <1> ;;		 if it causes R/W page fault.)
   104                              <1> ;;
   105                              <1> ;;	Every user process has own (different)
   106                              <1> ;;	page directory and page tables.	
   107                              <1> ;;
   108                              <1> ;;	Code starts at virtual address 0, always.
   109                              <1> ;;	(Initial value of EIP is 0 in user mode.)
   110                              <1> ;;	(Programs can be written/developed as simple
   111                              <1> ;;	 flat memory programs.)
   112                              <1> ;;
   113                              <1> ;; MEMORY ALLOCATION STRATEGY:
   114                              <1> ;;	Memory page will be allocated by kernel only 
   115                              <1> ;;		(in kernel/system mode only).
   116                              <1> ;;	* After a
   117                              <1> ;;	  - 'not present' page fault
   118                              <1> ;;	  - 'writing attempt on read only page' page fault 	 	
   119                              <1> ;;	* For loading (opening, reading) a file or disk/drive
   120                              <1> ;;	* As responce to 'allocate additional memory blocks' 
   121                              <1> ;;	  request by running process.
   122                              <1> ;;	* While creating a process, allocating a new buffer,
   123                              <1> ;;	  new page tables etc.
   124                              <1> ;;
   125                              <1> ;;	At first,
   126                              <1> ;;	- 'allocate page' procedure will be called;
   127                              <1> ;,	   if it will return with a valid (>0) physical address
   128                              <1> ;;	   (that means the relevant M.A.T. bit has been RESET)	
   129                              <1> ;;	   relevant memory page/block will be cleared (zeroed).
   130                              <1> ;;	- 'allocate page' will be called for allocating page
   131                              <1> ;;	   directory, page table and running space (data/code).
   132                              <1> ;;	- every successful 'allocate page' call will decrease
   133                              <1> ;;	  'free_pages' count (pointer).
   134                              <1> ;;	- 'out of (insufficient) memory error' will be returned
   135                              <1> ;;	  if 'free_pages' points to a ZERO.
   136                              <1> ;;	- swapping out and swapping in (if it is not a new page)
   137                              <1> ;;	  procedures will be called as responce to 'out of memory'
   138                              <1> ;;	  error except errors caused by attribute conflicts.
   139                              <1> ;;	 (swapper functions)	 
   140                              <1> ;;					
   141                              <1> ;;	At second,
   142                              <1> ;;	- page directory entry will be updated then page table
   143                              <1> ;;	  entry will be updated.		
   144                              <1> ;;
   145                              <1> ;; MEMORY ALLOCATION TABLE FORMAT:
   146                              <1> ;;	- M.A.T. has a size according to available memory as
   147                              <1> ;;	  follows:
   148                              <1> ;;		  - 1 (allocation) bit per 1 page (4096 bytes)
   149                              <1> ;;		  - a bit with value of 0 means allocated page
   150                              <1> ;;		  - a bit with value of 1 means a free page
   151                              <1> ;,	- 'free_pages' pointer holds count of free pages
   152                              <1> ;;	  depending on M.A.T.
   153                              <1> ;;		(NOTE: Free page count will not be checked
   154                              <1> ;;		again -on M.A.T.- after initialization. 
   155                              <1> ;;		Kernel will trust on initial count.)
   156                              <1> ;,	- 'free_pages' count will be decreased by allocation
   157                              <1> ;;	  and it will be increased by deallocation procedures.
   158                              <1> ;;	
   159                              <1> ;;	- Available memory will be calculated during
   160                              <1> ;;	  the kernel's initialization stage (in real mode).
   161                              <1> ;;	  Memory allocation table and kernel page tables 
   162                              <1> ;;	  will be formatted/sized as result of available
   163                              <1> ;;	  memory calculation before paging is enabled.
   164                              <1> ;;
   165                              <1> ;; For 4GB Available/Present Memory: (max. possible memory size)
   166                              <1> ;;	- Memory Allocation Table size will be 128 KB.
   167                              <1> ;;	- Memory allocation for kernel page directory size 
   168                              <1> ;;	  is always 4 KB. (in addition to total allocation size
   169                              <1> ;;	  for page tables)
   170                              <1> ;;	- Memory allocation for kernel page tables (1024 tables)
   171                              <1> ;;	  is 4 MB (1024*4*1024 bytes).
   172                              <1> ;;	- User (available) space will be started 
   173                              <1> ;;	  at 6th MB of the memory (after 1MB+4MB).
   174                              <1> ;;	- The first 640 KB is for kernel's itself plus
   175                              <1> ;;	  memory allocation table and kernel's page directory
   176                              <1> ;;	  (D0000h-EFFFFh may be used as kernel space...)	
   177                              <1> ;;	- B0000h to B7FFFh address space (32 KB) will be used
   178                              <1> ;; 	  for buffers.
   179                              <1> ;;	- ROMBIOS, VIDEO BUFFER and VIDEO ROM space are reserved.
   180                              <1> ;,	  (A0000h-AFFFFh, C0000h-CFFFFh, F0000h-FFFFFh)
   181                              <1> ;;	- Kernel page tables start at 100000h (2nd MB)
   182                              <1> ;;
   183                              <1> ;; For 1GB Available Memory:
   184                              <1> ;;	- Memory Allocation Table size will be 32 KB.
   185                              <1> ;;	- Memory allocation for kernel page directory size 
   186                              <1> ;;	  is always 4 KB. (in addition to total allocation size
   187                              <1> ;;	  for page tables)
   188                              <1> ;;	- Memory allocation for kernel page tables (256 tables)
   189                              <1> ;;	  is 1 MB (256*4*1024 bytes).
   190                              <1> ;;	- User (available) space will be started 
   191                              <1> ;;	  at 3th MB of the memory (after 1MB+1MB).
   192                              <1> ;;	- The first 640 KB is for kernel's itself plus
   193                              <1> ;;	  memory allocation table and kernel's page directory
   194                              <1> ;;	  (D0000h-EFFFFh may be used as kernel space...)	
   195                              <1> ;;	- B0000h to B7FFFh address space (32 KB) will be used
   196                              <1> ;; 	  for buffers.
   197                              <1> ;;	- ROMBIOS, VIDEO BUFFER and VIDEO ROM space are reserved.
   198                              <1> ;,	  (A0000h-AFFFFh, C0000h-CFFFFh, F0000h-FFFFFh)
   199                              <1> ;;	- Kernel page tables start at 100000h (2nd MB).	
   200                              <1> ;;
   201                              <1> ;;
   202                              <1> 
   203                              <1> 
   204                              <1> ;;************************************************************************************
   205                              <1> ;; 
   206                              <1> ;; RETRO UNIX 386 v1 - Paging (Method for Copy On Write paging principle)
   207                              <1> ;; DEMAND PAGING - PARENT&CHILD PAGE TABLE DUPLICATION PRINCIPLES (23/04/2015)
   208                              <1> 
   209                              <1> ;; Main factor: "sys fork" system call 
   210                              <1> ;;	
   211                              <1> ;; 		FORK
   212                              <1> ;;                      |----> parent - duplicated PTEs, read only pages
   213                              <1> ;;  writable pages ---->|
   214                              <1> ;;                      |----> child - duplicated PTEs, read only pages
   215                              <1> ;; 
   216                              <1> ;; AVL bit (0) of Page Table Entry is used as duplication sign 
   217                              <1> ;; 
   218                              <1> ;; AVL Bit 0 [PTE Bit 9] = 'Duplicated PTE belongs to child' sign/flag (if it is set)
   219                              <1> ;; Note: Dirty bit (PTE bit 6) may be used instead of AVL bit 0 (PTE bit 9)
   220                              <1> ;;       -while R/W bit is 0-. 
   221                              <1> ;; 
   222                              <1> ;; Duplicate page tables with writable pages (the 1st sys fork in the process):
   223                              <1> ;; # Parent's Page Table Entries are updated to point same pages as read only, 
   224                              <1> ;;   as duplicated PTE bit  -AVL bit 0, PTE bit 9- are reset/clear.
   225                              <1> ;; # Then Parent's Page Table is copied to Child's Page Table.
   226                              <1> ;; # Child's Page Table Entries are updated as duplicated child bit
   227                              <1> ;;   -AVL bit 0, PTE bit 9- is set.	  
   228                              <1> ;; 
   229                              <1> ;; Duplicate page tables with read only pages (several sys fork system calls):
   230                              <1> ;; # Parent's read only pages are copied to new child pages. 
   231                              <1> ;;   Parent's PTE attributes are not changed.
   232                              <1> ;;   (Because, there is another parent-child fork before this fork! We must not
   233                              <1> ;;    destroy/mix previous fork result).
   234                              <1> ;; # Child's Page Table Entries (which are corresponding to Parent's 
   235                              <1> ;;   read only pages) are set as writable (while duplicated PTE bit is clear). 
   236                              <1> ;; # Parent's PTEs with writable page attribute are updated to point same pages 
   237                              <1> ;;   as read only, (while) duplicated PTE bit is reset (clear).
   238                              <1> ;; # Parent's Page Table Entries (with writable page attribute) are duplicated 
   239                              <1> ;;   as Child's Page Table Entries without copying actual page.
   240                              <1> ;; # Child 's Page Table Entries (which are corresponding to Parent's writable 
   241                              <1> ;;   pages) are updated as duplicated PTE bit (AVL bit 0, PTE bit 9- is set.
   242                              <1> ;; 
   243                              <1> ;; !? WHAT FOR (duplication after duplication):
   244                              <1> ;; In UNIX method for sys fork (a typical 'fork' application in /etc/init)
   245                              <1> ;; program/executable code continues from specified location as child process, 
   246                              <1> ;; returns back previous code location as parent process, every child after 
   247                              <1> ;; every sys fork uses last image of code and data just prior the fork.
   248                              <1> ;; Even if the parent code changes data, the child will not see the changed data 
   249                              <1> ;; after the fork. In Retro UNIX 8086 v1, parent's process segment (32KB)
   250                              <1> ;; was copied to child's process segment (all of code and data) according to
   251                              <1> ;; original UNIX v1 which copies all of parent process code and data -core- 
   252                              <1> ;; to child space -core- but swaps that core image -of child- on to disk.
   253                              <1> ;; If I (Erdogan Tan) would use a method of to copy parent's core
   254                              <1> ;; (complete running image of parent process) to the child process; 
   255                              <1> ;; for big sizes, i would force Retro UNIX 386 v1 to spend many memory pages 
   256                              <1> ;; and times only for a sys fork. (It would excessive reservation for sys fork,
   257                              <1> ;; because sys fork usually is prior to sys exec; sys exec always establishes
   258                              <1> ;; a new/fresh core -running space-, by clearing all code/data content). 
   259                              <1> ;; 'Read Only' page flag ensures page fault handler is needed only for a few write
   260                              <1> ;; attempts between sys fork and sys exec, not more... (I say so by thinking 
   261                              <1> ;; of "/etc/init" content, specially.) sys exec will clear page tables and
   262                              <1> ;; new/fresh pages will be used to load and run new executable/program.
   263                              <1> ;; That is what for i have preferred "copy on write", "duplication" method
   264                              <1> ;; for sharing same read only pages between parent and child processes.
   265                              <1> ;; That is a pitty i have to use new private flag (AVL bit 0, "duplicated PTE 
   266                              <1> ;; belongs to child" sign) for cooperation on duplicated pages between a parent 
   267                              <1> ;; and it's child processes; otherwise parent process would destroy data belongs
   268                              <1> ;; to its child or vice versa; or some pages would remain unclaimed 
   269                              <1> ;; -deallocation problem-.
   270                              <1> ;; Note: to prevent conflicts, read only pages must not be swapped out... 
   271                              <1> ;; 
   272                              <1> ;; WHEN PARENT TRIES TO WRITE IT'S READ ONLY (DUPLICATED) PAGE:
   273                              <1> ;; # Page fault handler will do those:
   274                              <1> ;;   - 'Duplicated PTE' flag (PTE bit 9) is checked (on the failed PTE).
   275                              <1> ;;   - If it is reset/clear, there is a child uses same page.
   276                              <1> ;;   - Parent's read only page -previous page- is copied to a new writable page. 
   277                              <1> ;;   - Parent's PTE is updated as writable page, as unique page (AVL=0)
   278                              <1> ;;   - (Page fault handler whill check this PTE later, if child process causes to
   279                              <1> ;;     page fault due to write attempt on read only page. Of course, the previous 
   280                              <1> ;;     read only page will be converted to writable and unique page which belongs
   281                              <1> ;;     to child process.)	
   282                              <1> ;; WHEN CHILD TRIES TO WRITE IT'S READ ONLY (DUPLICATED) PAGE:
   283                              <1> ;; # Page fault handler will do those:
   284                              <1> ;;   - 'Duplicated PTE' flag (PTE bit 9) is checked (on the failed PTE).
   285                              <1> ;;   - If it is set, there is a parent uses -or was using- same page.
   286                              <1> ;;   - Same PTE address within parent's page table is checked if it has same page
   287                              <1> ;;     address or not. 
   288                              <1> ;;   - If parent's PTE has same address, child will continue with a new writable page.
   289                              <1> ;;     Parent's PTE will point to same (previous) page as writable, unique (AVL=0).	
   290                              <1> ;;   - If parent's PTE has different address, child will continue with it's 
   291                              <1> ;;     own/same page but read only flag (0) will be changed to writable flag (1) and
   292                              <1> ;;     'duplicated PTE (belongs to child)' flag/sign will be cleared/reset. 	  	
   293                              <1> ;; 
   294                              <1> ;; NOTE: When a child process is terminated, read only flags of parent's page tables
   295                              <1> ;;       will be set as writable (and unique) in case of child process was using 
   296                              <1> ;;       same pages with duplicated child PTE sign... Depending on sys fork and 
   297                              <1> ;;       duplication method details, it is not possible multiple child processes
   298                              <1> ;;       were using same page with duplicated PTEs.
   299                              <1> ;; 
   300                              <1> ;;************************************************************************************   
   301                              <1> 
   302                              <1> ;; 08/10/2014
   303                              <1> ;; 11/09/2014 - Retro UNIX 386 v1 PAGING (further) draft
   304                              <1> ;;		by Erdogan Tan (Based on KolibriOS 'memory.inc')
   305                              <1> 
   306                              <1> ;; 'allocate_page' code is derived and modified from KolibriOS
   307                              <1> ;; 'alloc_page' procedure in 'memory.inc' 
   308                              <1> ;; (25/08/2014, Revision: 5057) file 
   309                              <1> ;; by KolibriOS Team (2004-2012)
   310                              <1> 
   311                              <1> allocate_page:
   312                              <1> 	; 01/07/2015
   313                              <1> 	; 05/05/2015
   314                              <1> 	; 30/04/2015
   315                              <1> 	; 16/10/2014
   316                              <1> 	; 08/10/2014
   317                              <1> 	; 09/09/2014 (Retro UNIX 386 v1 - beginning)
   318                              <1> 	;
   319                              <1> 	; INPUT -> none
   320                              <1> 	;
   321                              <1> 	; OUTPUT ->
   322                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF THE ALLOCATED PAGE
   323                              <1> 	;	(corresponding MEMORY ALLOCATION TABLE bit is RESET)
   324                              <1> 	;
   325                              <1> 	;	CF = 1 and EAX = 0 
   326                              <1> 	; 		   if there is not a free page to be allocated	
   327                              <1> 	;
   328                              <1> 	; Modified Registers -> none (except EAX)
   329                              <1> 	;
   330 00004BD7 A1[C8580100]        <1> 	mov	eax, [free_pages]
   331 00004BDC 21C0                <1> 	and	eax, eax
   332 00004BDE 7438                <1> 	jz	short out_of_memory
   333                              <1> 	;
   334 00004BE0 53                  <1> 	push	ebx
   335 00004BE1 51                  <1> 	push	ecx
   336                              <1> 	;
   337 00004BE2 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL   ; Memory Allocation Table offset
   338 00004BE7 89D9                <1> 	mov	ecx, ebx
   339                              <1>  				     ; NOTE: 32 (first_page) is initial
   340                              <1> 				     ; value of [next_page].
   341                              <1> 				     ; It points to the first available
   342                              <1> 				     ; page block for users (ring 3) ...	
   343                              <1> 				     ; (MAT offset 32 = 1024/32)	
   344                              <1> 				     ; (at the of the first 4 MB)		
   345 00004BE9 031D[CC580100]      <1> 	add	ebx, [next_page] ; Free page searching starts from here
   346                              <1> 				 ; next_free_page >> 5
   347 00004BEF 030D[D0580100]      <1> 	add	ecx, [last_page] ; Free page searching ends here
   348                              <1> 				 ; (total_pages - 1) >> 5
   349                              <1> al_p_scan:
   350 00004BF5 39CB                <1> 	cmp	ebx, ecx
   351 00004BF7 770A                <1> 	ja	short al_p_notfound
   352                              <1> 	;
   353                              <1> 	; 01/07/2015
   354                              <1> 	; AMD64 Architecture Programmers Manual
   355                              <1> 	; Volume 3:
   356                              <1> 	; General-Purpose and System Instructions
   357                              <1> 	;
   358                              <1> 	; BSF - Bit Scan Forward
   359                              <1> 	;
   360                              <1> 	;   Searches the value in a register or a memory location
   361                              <1> 	;   (second operand) for the least-significant set bit. 
   362                              <1> 	;   If a set bit is found, the instruction clears the zero flag (ZF)
   363                              <1> 	;   and stores the index of the least-significant set bit in a destination
   364                              <1> 	;   register (first operand). If the second operand contains 0, 
   365                              <1> 	;   the instruction sets ZF to 1 and does not change the contents of the 
   366                              <1> 	;   destination register. The bit index is an unsigned offset from bit 0 
   367                              <1> 	;   of the searched value
   368                              <1> 	;
   369 00004BF9 0FBC03              <1> 	bsf	eax, [ebx] ; Scans source operand for first bit set (1).
   370                              <1> 			   ; Clear ZF if a bit is found set (1) and 
   371                              <1> 			   ; loads the destination with an index to
   372                              <1> 			   ; first set bit. (0 -> 31) 
   373                              <1> 			   ; Sets ZF to 1 if no bits are found set.
   374 00004BFC 7525                <1> 	jnz	short al_p_found ; ZF = 0 -> a free page has been found
   375                              <1> 			 ;
   376                              <1> 			 ; NOTE:  a Memory Allocation Table bit 
   377                              <1> 			 ;	  with value of 1 means 
   378                              <1> 			 ;	  the corresponding page is free 
   379                              <1> 			 ;	  (Retro UNIX 386 v1 feature only!)
   380 00004BFE 83C304              <1> 	add	ebx, 4
   381                              <1> 			 ; We return back for searching next page block
   382                              <1> 			 ; NOTE: [free_pages] is not ZERO; so, 
   383                              <1> 			 ;	 we always will find at least 1 free page here.
   384 00004C01 EBF2                <1>         jmp     short al_p_scan
   385                              <1> 	;
   386                              <1> al_p_notfound:
   387 00004C03 81E900001000        <1> 	sub	ecx, MEM_ALLOC_TBL
   388 00004C09 890D[CC580100]      <1> 	mov	[next_page], ecx ; next/first free page = last page 
   389                              <1> 				 ; (deallocate_page procedure will change it)
   390 00004C0F 31C0                <1> 	xor	eax, eax
   391 00004C11 A3[C8580100]        <1> 	mov	[free_pages], eax ; 0
   392 00004C16 59                  <1> 	pop	ecx
   393 00004C17 5B                  <1> 	pop	ebx
   394                              <1> 	;
   395                              <1> out_of_memory:
   396 00004C18 E85B040000          <1> 	call	swap_out
   397 00004C1D 7325                <1> 	jnc	short al_p_ok  ; [free_pages] = 0, re-allocation by swap_out
   398                              <1> 	;
   399 00004C1F 29C0                <1> 	sub 	eax, eax ; 0
   400 00004C21 F9                  <1> 	stc
   401 00004C22 C3                  <1> 	retn
   402                              <1> 
   403                              <1> al_p_found:
   404 00004C23 89D9                <1> 	mov	ecx, ebx
   405 00004C25 81E900001000        <1> 	sub	ecx, MEM_ALLOC_TBL
   406 00004C2B 890D[CC580100]      <1> 	mov	[next_page], ecx ; Set first free page searching start
   407                              <1> 				 ; address/offset (to the next)
   408 00004C31 FF0D[C8580100]      <1>         dec     dword [free_pages] ; 1 page has been allocated (X = X-1) 
   409                              <1> 	;
   410 00004C37 0FB303              <1> 	btr	[ebx], eax	 ; The destination bit indexed by the source value
   411                              <1> 				 ; is copied into the Carry Flag and then cleared
   412                              <1> 				 ; in the destination.
   413                              <1> 				 ;
   414                              <1> 				 ; Reset the bit which is corresponding to the 
   415                              <1> 				 ; (just) allocated page.
   416                              <1> 	; 01/07/2015 (4*8 = 32, 1 allocation byte = 8 pages)	
   417 00004C3A C1E103              <1> 	shl	ecx, 3		 ; (page block offset * 32) + page index
   418 00004C3D 01C8                <1> 	add	eax, ecx	 ; = page number
   419 00004C3F C1E00C              <1> 	shl	eax, 12		 ; physical address of the page (flat/real value)
   420                              <1> 	; EAX = physical address of memory page
   421                              <1> 	;
   422                              <1> 	; NOTE: The relevant page directory and page table entry will be updated
   423                              <1> 	;       according to this EAX value...
   424 00004C42 59                  <1> 	pop	ecx
   425 00004C43 5B                  <1> 	pop	ebx
   426                              <1> al_p_ok:
   427 00004C44 C3                  <1> 	retn
   428                              <1> 
   429                              <1> 
   430                              <1> make_page_dir:
   431                              <1> 	; 18/04/2015
   432                              <1> 	; 12/04/2015
   433                              <1> 	; 23/10/2014
   434                              <1> 	; 16/10/2014
   435                              <1> 	; 09/10/2014 ; (Retro UNIX 386 v1 - beginning)
   436                              <1> 	;
   437                              <1> 	; INPUT ->
   438                              <1> 	;	none
   439                              <1> 	; OUTPUT ->
   440                              <1> 	;	(EAX = 0)
   441                              <1> 	;	cf = 1 -> insufficient (out of) memory error
   442                              <1> 	;	cf = 0 ->
   443                              <1> 	;	u.pgdir = page directory (physical) address of the current
   444                              <1> 	;		  process/user.
   445                              <1> 	;
   446                              <1> 	; Modified Registers -> EAX
   447                              <1> 	;
   448 00004C45 E88DFFFFFF          <1> 	call	allocate_page
   449 00004C4A 7216                <1> 	jc	short mkpd_error
   450                              <1> 	;
   451 00004C4C A3[B8030300]        <1> 	mov	[u.pgdir], eax    ; Page dir address for current user/process
   452                              <1> 				  ; (Physical address)
   453                              <1> clear_page:
   454                              <1> 	; 18/04/2015
   455                              <1> 	; 09/10/2014 ; (Retro UNIX 386 v1 - beginning)
   456                              <1> 	;
   457                              <1> 	; INPUT ->
   458                              <1> 	;	EAX = physical address of the page
   459                              <1> 	; OUTPUT ->
   460                              <1> 	;	all bytes of the page will be cleared
   461                              <1> 	;
   462                              <1> 	; Modified Registers -> none
   463                              <1> 	;
   464 00004C51 57                  <1> 	push	edi
   465 00004C52 51                  <1> 	push	ecx
   466 00004C53 50                  <1> 	push	eax
   467 00004C54 B900040000          <1> 	mov	ecx, PAGE_SIZE / 4
   468 00004C59 89C7                <1> 	mov	edi, eax
   469 00004C5B 31C0                <1> 	xor	eax, eax
   470 00004C5D F3AB                <1> 	rep	stosd
   471 00004C5F 58                  <1> 	pop	eax
   472 00004C60 59                  <1> 	pop	ecx
   473 00004C61 5F                  <1> 	pop	edi
   474                              <1> mkpd_error:
   475                              <1> mkpt_error:
   476 00004C62 C3                  <1> 	retn
   477                              <1> 
   478                              <1> make_page_table:
   479                              <1> 	; 23/06/2015
   480                              <1> 	; 18/04/2015
   481                              <1> 	; 12/04/2015
   482                              <1> 	; 16/10/2014
   483                              <1> 	; 09/10/2014 ; (Retro UNIX 386 v1 - beginning)
   484                              <1> 	;
   485                              <1> 	; INPUT ->
   486                              <1> 	;	EBX = virtual (linear) address
   487                              <1> 	;	ECX = page table attributes (lower 12 bits)
   488                              <1> 	;	      (higher 20 bits must be ZERO)
   489                              <1> 	;	      (bit 0 must be 1)	 
   490                              <1> 	;	u.pgdir = page directory (physical) address
   491                              <1> 	; OUTPUT ->
   492                              <1> 	;	EDX = Page directory entry address
   493                              <1> 	;	EAX = Page table address
   494                              <1> 	;	cf = 1 -> insufficient (out of) memory error
   495                              <1> 	;	cf = 0 -> page table address in the PDE (EDX)
   496                              <1> 	;
   497                              <1> 	; Modified Registers -> EAX, EDX
   498                              <1> 	;
   499 00004C63 E86FFFFFFF          <1> 	call	allocate_page
   500 00004C68 72F8                <1> 	jc	short mkpt_error
   501 00004C6A E811000000          <1> 	call	set_pde	
   502 00004C6F EBE0                <1> 	jmp	short clear_page
   503                              <1> 
   504                              <1> make_page:
   505                              <1> 	; 24/07/2015
   506                              <1> 	; 23/06/2015 ; (Retro UNIX 386 v1 - beginning)
   507                              <1> 	;
   508                              <1> 	; INPUT ->
   509                              <1> 	;	EBX = virtual (linear) address
   510                              <1> 	;	ECX = page attributes (lower 12 bits)
   511                              <1> 	;	      (higher 20 bits must be ZERO)
   512                              <1> 	;	      (bit 0 must be 1)	 
   513                              <1> 	;	u.pgdir = page directory (physical) address
   514                              <1> 	; OUTPUT ->
   515                              <1> 	;	EBX = Virtual address
   516                              <1> 	;	(EDX = PTE value)
   517                              <1> 	;	EAX = Physical address
   518                              <1> 	;	cf = 1 -> insufficient (out of) memory error
   519                              <1> 	;
   520                              <1> 	; Modified Registers -> EAX, EDX
   521                              <1> 	;
   522 00004C71 E861FFFFFF          <1> 	call	allocate_page
   523 00004C76 7207                <1> 	jc	short mkp_err
   524 00004C78 E821000000          <1> 	call	set_pte	
   525 00004C7D 73D2                <1> 	jnc	short clear_page ; 18/04/2015
   526                              <1> mkp_err:
   527 00004C7F C3                  <1> 	retn
   528                              <1> 
   529                              <1> 
   530                              <1> set_pde:	; Set page directory entry (PDE)
   531                              <1> 	; 20/07/2015
   532                              <1> 	; 18/04/2015
   533                              <1> 	; 12/04/2015
   534                              <1> 	; 23/10/2014
   535                              <1> 	; 10/10/2014 ; (Retro UNIX 386 v1 - beginning)
   536                              <1> 	;
   537                              <1> 	; INPUT ->
   538                              <1> 	;	EAX = physical address
   539                              <1> 	;	      (use present value if EAX = 0)
   540                              <1> 	;	EBX = virtual (linear) address
   541                              <1> 	;	ECX = page table attributes (lower 12 bits)
   542                              <1> 	;	      (higher 20 bits must be ZERO)
   543                              <1> 	;	      (bit 0 must be 1)	 
   544                              <1> 	;	u.pgdir = page directory (physical) address
   545                              <1> 	; OUTPUT ->
   546                              <1> 	;	EDX = PDE address
   547                              <1> 	;	EAX = page table address (physical)
   548                              <1> 	;	;(CF=1 -> Invalid page address)
   549                              <1> 	;
   550                              <1> 	; Modified Registers -> EDX
   551                              <1> 	;
   552 00004C80 89DA                <1> 	mov	edx, ebx
   553 00004C82 C1EA16              <1> 	shr	edx, PAGE_D_SHIFT ; 22
   554 00004C85 C1E202              <1> 	shl	edx, 2 ; offset to page directory (1024*4)
   555 00004C88 0315[B8030300]      <1> 	add	edx, [u.pgdir]
   556                              <1> 	;
   557 00004C8E 21C0                <1> 	and	eax, eax
   558 00004C90 7506                <1> 	jnz	short spde_1
   559                              <1> 	;
   560 00004C92 8B02                <1> 	mov	eax, [edx]  ; old PDE value
   561                              <1> 	;test	al, 1
   562                              <1> 	;jz	short spde_2
   563 00004C94 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h  ; clear lower 12 bits
   564                              <1> spde_1:
   565                              <1> 	;and	cx, 0FFFh
   566 00004C98 8902                <1> 	mov	[edx], eax
   567 00004C9A 66090A              <1> 	or	[edx], cx
   568 00004C9D C3                  <1> 	retn
   569                              <1> ;spde_2: ; error
   570                              <1> ;	stc
   571                              <1> ;	retn
   572                              <1> 
   573                              <1> set_pte:	; Set page table entry (PTE)
   574                              <1> 	; 24/07/2015
   575                              <1> 	; 20/07/2015
   576                              <1> 	; 23/06/2015
   577                              <1> 	; 18/04/2015
   578                              <1> 	; 12/04/2015
   579                              <1> 	; 10/10/2014 ; (Retro UNIX 386 v1 - beginning)
   580                              <1> 	;
   581                              <1> 	; INPUT ->
   582                              <1> 	;	EAX = physical page address
   583                              <1> 	;	      (use present value if EAX = 0)
   584                              <1> 	;	EBX = virtual (linear) address
   585                              <1> 	;	ECX = page attributes (lower 12 bits)
   586                              <1> 	;	      (higher 20 bits must be ZERO)
   587                              <1> 	;	      (bit 0 must be 1)	 
   588                              <1> 	;	u.pgdir = page directory (physical) address
   589                              <1> 	; OUTPUT ->
   590                              <1> 	;	EAX = physical page address
   591                              <1> 	;	(EDX = PTE value)
   592                              <1> 	;	EBX = virtual address
   593                              <1> 	;
   594                              <1> 	;	CF = 1 -> error
   595                              <1> 	;
   596                              <1> 	; Modified Registers -> EAX, EDX
   597                              <1> 	;
   598 00004C9E 50                  <1> 	push	eax
   599 00004C9F A1[B8030300]        <1> 	mov	eax, [u.pgdir] ; 20/07/2015
   600 00004CA4 E837000000          <1> 	call 	get_pde
   601                              <1> 		; EDX = PDE address
   602                              <1> 		; EAX = PDE value
   603 00004CA9 5A                  <1> 	pop	edx ; physical page address
   604 00004CAA 722A                <1> 	jc	short spte_err ; PDE not present
   605                              <1> 	;
   606 00004CAC 53                  <1> 	push	ebx ; 24/07/2015
   607 00004CAD 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 bits
   608                              <1> 			    ; EDX = PT address (physical)	
   609 00004CB1 C1EB0C              <1> 	shr	ebx, PAGE_SHIFT ; 12
   610 00004CB4 81E3FF030000        <1> 	and	ebx, PTE_MASK	; 03FFh
   611                              <1> 			 ; clear higher 10 bits (PD bits)
   612 00004CBA C1E302              <1> 	shl	ebx, 2   ; offset to page table (1024*4)
   613 00004CBD 01C3                <1> 	add	ebx, eax
   614                              <1> 	;
   615 00004CBF 8B03                <1> 	mov	eax, [ebx] ; Old PTE value
   616 00004CC1 A801                <1> 	test	al, 1
   617 00004CC3 740C                <1> 	jz	short spte_0
   618 00004CC5 09D2                <1> 	or	edx, edx
   619 00004CC7 750F                <1> 	jnz	short spte_1
   620 00004CC9 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 bits
   621 00004CCD 89C2                <1> 	mov	edx, eax
   622 00004CCF EB09                <1> 	jmp	short spte_2	
   623                              <1> spte_0:
   624                              <1> 	; If this PTE contains a swap (disk) address,
   625                              <1> 	; it can be updated by using 'swap_in' procedure
   626                              <1> 	; only!
   627 00004CD1 21C0                <1> 	and	eax, eax
   628 00004CD3 7403                <1> 	jz	short spte_1
   629                              <1> 	; 24/07/2015
   630                              <1> 	; swapped page ! (on disk)
   631 00004CD5 5B                  <1> 	pop	ebx
   632                              <1> spte_err:
   633 00004CD6 F9                  <1> 	stc
   634 00004CD7 C3                  <1> 	retn
   635                              <1> spte_1: 
   636 00004CD8 89D0                <1> 	mov	eax, edx
   637                              <1> spte_2:
   638 00004CDA 09CA                <1> 	or	edx, ecx
   639                              <1> 	; 23/06/2015
   640 00004CDC 8913                <1> 	mov	[ebx], edx ; PTE value in EDX
   641                              <1> 	; 24/07/2015
   642 00004CDE 5B                  <1> 	pop	ebx
   643 00004CDF C3                  <1> 	retn
   644                              <1> 
   645                              <1> get_pde:	; Get present value of the relevant PDE
   646                              <1> 	; 20/07/2015
   647                              <1> 	; 18/04/2015
   648                              <1> 	; 12/04/2015
   649                              <1> 	; 10/10/2014 ; (Retro UNIX 386 v1 - beginning)
   650                              <1> 	;
   651                              <1> 	; INPUT ->
   652                              <1> 	;	EBX = virtual (linear) address
   653                              <1> 	;	EAX = page directory (physical) address
   654                              <1> 	; OUTPUT ->
   655                              <1> 	;	EDX = Page directory entry address
   656                              <1> 	;	EAX = Page directory entry value
   657                              <1> 	;	CF = 1 -> PDE not present or invalid ? 
   658                              <1> 	; Modified Registers -> EDX, EAX
   659                              <1> 	;
   660 00004CE0 89DA                <1> 	mov	edx, ebx
   661 00004CE2 C1EA16              <1> 	shr	edx, PAGE_D_SHIFT ; 22  (12+10)
   662 00004CE5 C1E202              <1> 	shl 	edx, 2 ; offset to page directory (1024*4)
   663 00004CE8 01C2                <1> 	add	edx, eax ; page directory address (physical)
   664 00004CEA 8B02                <1> 	mov	eax, [edx]
   665 00004CEC A801                <1> 	test	al, PDE_A_PRESENT ; page table is present or not !
   666 00004CEE 751F                <1> 	jnz	short gpte_retn
   667 00004CF0 F9                  <1> 	stc
   668                              <1> gpde_retn:	
   669 00004CF1 C3                  <1> 	retn
   670                              <1> 
   671                              <1> get_pte:
   672                              <1> 		; Get present value of the relevant PTE
   673                              <1> 	; 29/07/2015
   674                              <1> 	; 20/07/2015
   675                              <1> 	; 18/04/2015
   676                              <1> 	; 12/04/2015
   677                              <1> 	; 10/10/2014 ; (Retro UNIX 386 v1 - beginning)
   678                              <1> 	;
   679                              <1> 	; INPUT ->
   680                              <1> 	;	EBX = virtual (linear) address
   681                              <1> 	;	EAX = page directory (physical) address
   682                              <1> 	; OUTPUT ->
   683                              <1> 	;	EDX = Page table entry address (if CF=0)
   684                              <1> 	;	      Page directory entry address (if CF=1)
   685                              <1> 	;            (Bit 0 value is 0 if PT is not present)
   686                              <1> 	;	EAX = Page table entry value (page address)
   687                              <1> 	;	CF = 1 -> PDE not present or invalid ? 
   688                              <1> 	; Modified Registers -> EAX, EDX
   689                              <1> 	;
   690 00004CF2 E8E9FFFFFF          <1> 	call 	get_pde
   691 00004CF7 72F8                <1> 	jc	short gpde_retn	; page table is not present
   692                              <1> 	;jnc	short gpte_1
   693                              <1> 	;retn
   694                              <1> ;gpte_1:
   695 00004CF9 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 bits
   696 00004CFD 89DA                <1> 	mov	edx, ebx
   697 00004CFF C1EA0C              <1> 	shr	edx, PAGE_SHIFT ; 12
   698 00004D02 81E2FF030000        <1> 	and	edx, PTE_MASK	; 03FFh
   699                              <1> 			 ; clear higher 10 bits (PD bits)
   700 00004D08 C1E202              <1> 	shl	edx, 2 ; offset from start of page table (1024*4)
   701 00004D0B 01C2                <1> 	add	edx, eax
   702 00004D0D 8B02                <1> 	mov	eax, [edx]
   703                              <1> gpte_retn:
   704 00004D0F C3                  <1> 	retn
   705                              <1> 
   706                              <1> deallocate_page_dir:
   707                              <1> 	; 15/09/2015
   708                              <1> 	; 05/08/2015
   709                              <1> 	; 30/04/2015
   710                              <1> 	; 28/04/2015
   711                              <1> 	; 17/10/2014
   712                              <1> 	; 12/10/2014 (Retro UNIX 386 v1 - beginning)
   713                              <1> 	;
   714                              <1> 	; INPUT ->
   715                              <1> 	;	EAX = PHYSICAL ADDRESS OF THE PAGE DIRECTORY (CHILD)
   716                              <1> 	;	EBX = PHYSICAL ADDRESS OF THE PARENT'S PAGE DIRECTORY
   717                              <1> 	; OUTPUT ->
   718                              <1> 	;	All of page tables in the page directory
   719                              <1> 	;	and page dir's itself will be deallocated
   720                              <1> 	;	except 'read only' duplicated pages (will be converted
   721                              <1> 	;	to writable pages).
   722                              <1> 	;
   723                              <1> 	; Modified Registers -> EAX
   724                              <1> 	;
   725                              <1> 	;
   726 00004D10 56                  <1> 	push	esi
   727 00004D11 51                  <1> 	push	ecx
   728 00004D12 50                  <1> 	push	eax
   729 00004D13 89C6                <1> 	mov	esi, eax 
   730 00004D15 31C9                <1> 	xor	ecx, ecx
   731                              <1> 	; The 1st PDE points to Kernel Page Table 0 (the 1st 4MB),
   732                              <1> 	; it must not be deallocated
   733 00004D17 890E                <1> 	mov	[esi], ecx ; 0 ; clear PDE 0
   734                              <1> dapd_0:
   735 00004D19 AD                  <1> 	lodsd
   736 00004D1A A801                <1> 	test	al, PDE_A_PRESENT ; bit 0, present flag (must be 1)
   737 00004D1C 7409                <1> 	jz	short dapd_1	
   738 00004D1E 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
   739 00004D22 E812000000          <1> 	call	deallocate_page_table			
   740                              <1> dapd_1:
   741 00004D27 41                  <1> 	inc	ecx ; page directory entry index
   742 00004D28 81F900040000        <1> 	cmp	ecx, PAGE_SIZE / 4 ; 1024
   743 00004D2E 72E9                <1> 	jb	short dapd_0
   744                              <1> dapd_2:
   745 00004D30 58                  <1> 	pop	eax
   746 00004D31 E87F000000          <1> 	call	deallocate_page	; deallocate the page dir's itself
   747 00004D36 59                  <1> 	pop	ecx
   748 00004D37 5E                  <1> 	pop	esi
   749 00004D38 C3                  <1> 	retn
   750                              <1> 
   751                              <1> deallocate_page_table:
   752                              <1> 	; 12/07/2016
   753                              <1> 	; 19/09/2015
   754                              <1> 	; 15/09/2015
   755                              <1> 	; 05/08/2015
   756                              <1> 	; 30/04/2015
   757                              <1> 	; 28/04/2015
   758                              <1> 	; 24/10/2014
   759                              <1> 	; 23/10/2014
   760                              <1> 	; 12/10/2014 (Retro UNIX 386 v1 - beginning)
   761                              <1> 	;
   762                              <1> 	; INPUT ->
   763                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF THE PAGE TABLE
   764                              <1> 	;	EBX = PHYSICAL ADDRESS OF THE PARENT'S PAGE DIRECTORY
   765                              <1> 	;	(ECX = page directory entry index)
   766                              <1> 	; OUTPUT ->
   767                              <1> 	;	All of pages in the page table and page table's itself
   768                              <1> 	;	will be deallocated except 'read only' duplicated pages
   769                              <1> 	;	(will be converted to writable pages).
   770                              <1> 	;
   771                              <1> 	; Modified Registers -> EAX
   772                              <1> 	;
   773 00004D39 56                  <1> 	push	esi
   774 00004D3A 57                  <1> 	push	edi
   775 00004D3B 52                  <1> 	push	edx
   776 00004D3C 50                  <1> 	push	eax ; *
   777 00004D3D 89C6                <1> 	mov	esi, eax 
   778 00004D3F 31FF                <1> 	xor	edi, edi ; 0
   779                              <1> dapt_0:
   780 00004D41 AD                  <1> 	lodsd
   781 00004D42 A801                <1> 	test	al, PTE_A_PRESENT ; bit 0, present flag (must be 1)
   782 00004D44 7441                <1> 	jz	short dapt_1
   783                              <1> 	;
   784 00004D46 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
   785                              <1> 				  ; (must be 1)
   786 00004D48 754C                <1> 	jnz	short dapt_3
   787                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
   788 00004D4A 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
   789                              <1> 				   ; as child's page ?
   790 00004D4E 7451                <1> 	jz	short dapt_4 ; Clear PTE but don't deallocate the page!
   791                              <1> 	; check the parent's PTE value is read only & same page or not.. 
   792                              <1> 	; ECX = page directory entry index (0-1023)
   793 00004D50 53                  <1> 	push	ebx
   794 00004D51 51                  <1> 	push	ecx
   795 00004D52 66C1E102            <1> 	shl	cx, 2 ; *4 
   796 00004D56 01CB                <1> 	add	ebx, ecx ; PDE offset (for the parent)
   797 00004D58 8B0B                <1> 	mov	ecx, [ebx]
   798 00004D5A F6C101              <1> 	test	cl, PDE_A_PRESENT ; present (valid) or not ?
   799 00004D5D 7435                <1> 	jz	short dapt_2	; parent process does not use this page
   800 00004D5F 6681E100F0          <1> 	and	cx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
   801                              <1> 	; EDI = page table entry index (0-1023)
   802 00004D64 89FA                <1> 	mov	edx, edi 
   803 00004D66 66C1E202            <1> 	shl	dx, 2 ; *4 
   804 00004D6A 01CA                <1> 	add	edx, ecx ; PTE offset (for the parent)
   805 00004D6C 8B1A                <1> 	mov	ebx, [edx]
   806 00004D6E F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
   807 00004D71 7421                <1> 	jz	short dapt_2	; parent process does not use this page
   808 00004D73 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
   809 00004D77 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
   810 00004D7C 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
   811 00004D7E 7514                <1> 	jne	short dapt_2	; not same page
   812                              <1> 				; deallocate the child's page
   813 00004D80 800A02              <1>         or      byte [edx], PTE_A_WRITE ; convert to writable page (parent)
   814 00004D83 59                  <1> 	pop	ecx
   815 00004D84 5B                  <1> 	pop	ebx
   816 00004D85 EB1A                <1> 	jmp	short dapt_4
   817                              <1> dapt_1:
   818 00004D87 09C0                <1> 	or	eax, eax	; swapped page ?
   819 00004D89 741D                <1> 	jz	short dapt_5	; no
   820                              <1> 				; yes
   821 00004D8B D1E8                <1> 	shr	eax, 1
   822 00004D8D E8CA040000          <1> 	call	unlink_swap_block ; Deallocate swapped page block
   823                              <1> 				  ; on the swap disk (or in file)
   824 00004D92 EB14                <1> 	jmp	short dapt_5
   825                              <1> dapt_2:
   826 00004D94 59                  <1> 	pop	ecx
   827 00004D95 5B                  <1> 	pop	ebx
   828                              <1> dapt_3:	
   829                              <1> 	; 12/07/2016
   830 00004D96 66A90004            <1> 	test	ax, PTE_SHARED ; shared or direct memory access indicator
   831 00004D9A 7505                <1> 	jnz	short dapt_4   ; AVL bit 1 = 1, do not deallocate this page!
   832                              <1> 	;
   833                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
   834 00004D9C E814000000          <1> 	call	deallocate_page ; set the mem allocation bit of this page
   835                              <1> dapt_4:
   836 00004DA1 C746FC00000000      <1> 	mov	dword [esi-4], 0 ; clear/reset PTE (child, dupl. as parent)
   837                              <1> dapt_5:
   838 00004DA8 47                  <1> 	inc	edi ; page table entry index
   839 00004DA9 81FF00040000        <1> 	cmp	edi, PAGE_SIZE / 4 ; 1024
   840 00004DAF 7290                <1> 	jb	short dapt_0
   841                              <1> 	;
   842 00004DB1 58                  <1> 	pop	eax ; *
   843 00004DB2 5A                  <1> 	pop	edx
   844 00004DB3 5F                  <1> 	pop	edi	
   845 00004DB4 5E                  <1> 	pop	esi
   846                              <1> 	;
   847                              <1> 	;call	deallocate_page	; deallocate the page table's itself
   848                              <1> 	;retn
   849                              <1> 
   850                              <1> deallocate_page:
   851                              <1> 	; 15/09/2015
   852                              <1> 	; 28/04/2015
   853                              <1> 	; 10/03/2015
   854                              <1> 	; 17/10/2014
   855                              <1> 	; 12/10/2014 (Retro UNIX 386 v1 - beginning)
   856                              <1> 	;
   857                              <1> 	; INPUT -> 
   858                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF THE ALLOCATED PAGE
   859                              <1> 	; OUTPUT ->
   860                              <1> 	;	[free_pages] is increased
   861                              <1> 	;	(corresponding MEMORY ALLOCATION TABLE bit is SET)
   862                              <1> 	;	CF = 1 if the page is already deallocated
   863                              <1> 	; 	       (or not allocated) before.  
   864                              <1> 	;
   865                              <1> 	; Modified Registers -> EAX
   866                              <1> 	;
   867 00004DB5 53                  <1> 	push	ebx
   868 00004DB6 52                  <1> 	push	edx
   869                              <1> 	;
   870 00004DB7 C1E80C              <1> 	shr	eax, PAGE_SHIFT      ; shift physical address to 
   871                              <1> 				     ; 12 bits right
   872                              <1> 				     ; to get page number
   873 00004DBA 89C2                <1> 	mov	edx, eax
   874                              <1> 	; 15/09/2015
   875 00004DBC C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
   876                              <1> 				     ; (1 allocation bit = 1 page)
   877                              <1> 				     ; (1 allocation bytes = 8 pages)
   878 00004DBF 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
   879                              <1> 				     ; (to get 32 bit position)			
   880                              <1> 	;
   881 00004DC2 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL   ; Memory Allocation Table address
   882 00004DC7 01D3                <1> 	add	ebx, edx
   883 00004DC9 83E01F              <1> 	and	eax, 1Fh	     ; lower 5 bits only
   884                              <1> 				     ; (allocation bit position)	 
   885 00004DCC 3B15[CC580100]      <1> 	cmp 	edx, [next_page]     ; is the new free page address lower
   886                              <1> 				     ; than the address in 'next_page' ?
   887                              <1> 				     ; (next/first free page value)		
   888 00004DD2 7306                <1> 	jnb	short dap_1	     ; no	
   889 00004DD4 8915[CC580100]      <1> 	mov	[next_page], edx     ; yes
   890                              <1> dap_1:
   891 00004DDA 0FAB03              <1> 	bts	[ebx], eax	     ; unlink/release/deallocate page
   892                              <1> 				     ; set relevant bit to 1.
   893                              <1> 				     ; set CF to the previous bit value	
   894                              <1> 	;cmc			     ; complement carry flag	
   895                              <1> 	;jc	short dap_2	     ; do not increase free_pages count
   896                              <1> 				     ; if the page is already deallocated
   897                              <1> 				     ; before.	
   898 00004DDD FF05[C8580100]      <1>         inc     dword [free_pages]
   899                              <1> dap_2:
   900 00004DE3 5A                  <1> 	pop	edx
   901 00004DE4 5B                  <1> 	pop	ebx
   902 00004DE5 C3                  <1> 	retn
   903                              <1> 
   904                              <1> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   905                              <1> ;;                                                              ;;
   906                              <1> ;; Copyright (C) KolibriOS team 2004-2012. All rights reserved. ;;
   907                              <1> ;; Distributed under terms of the GNU General Public License    ;;
   908                              <1> ;;                                                              ;;
   909                              <1> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   910                              <1> 
   911                              <1> ;;$Revision: 5057 $
   912                              <1> 
   913                              <1> 
   914                              <1> ;;align 4
   915                              <1> ;;proc alloc_page
   916                              <1> 
   917                              <1> ;;        pushfd
   918                              <1> ;;        cli
   919                              <1> ;;        push    ebx
   920                              <1> ;;;//-
   921                              <1> ;;        cmp     [pg_data.pages_free], 1
   922                              <1> ;;        jle     .out_of_memory
   923                              <1> ;;;//-
   924                              <1> ;;
   925                              <1> ;;        mov     ebx, [page_start]
   926                              <1> ;;        mov     ecx, [page_end]
   927                              <1> ;;.l1:
   928                              <1> ;;        bsf     eax, [ebx];
   929                              <1> ;;        jnz     .found
   930                              <1> ;;        add     ebx, 4
   931                              <1> ;;        cmp     ebx, ecx
   932                              <1> ;;        jb      .l1
   933                              <1> ;;        pop     ebx
   934                              <1> ;;        popfd
   935                              <1> ;;        xor     eax, eax
   936                              <1> ;;        ret
   937                              <1> ;;.found:
   938                              <1> ;;;//-
   939                              <1> ;;        dec     [pg_data.pages_free]
   940                              <1> ;;        jz      .out_of_memory
   941                              <1> ;;;//-
   942                              <1> ;;        btr     [ebx], eax
   943                              <1> ;;        mov     [page_start], ebx
   944                              <1> ;;        sub     ebx, sys_pgmap
   945                              <1> ;;        lea     eax, [eax+ebx*8]
   946                              <1> ;;        shl     eax, 12
   947                              <1> ;;;//-       dec [pg_data.pages_free]
   948                              <1> ;;        pop     ebx
   949                              <1> ;;        popfd
   950                              <1> ;;        ret
   951                              <1> ;;;//-
   952                              <1> ;;.out_of_memory:
   953                              <1> ;;        mov     [pg_data.pages_free], 1
   954                              <1> ;;        xor     eax, eax
   955                              <1> ;;        pop     ebx
   956                              <1> ;;        popfd
   957                              <1> ;;        ret
   958                              <1> ;;;//-
   959                              <1> ;;endp
   960                              <1> 
   961                              <1> duplicate_page_dir:
   962                              <1> 	; 21/09/2015
   963                              <1> 	; 31/08/2015
   964                              <1> 	; 20/07/2015
   965                              <1> 	; 28/04/2015
   966                              <1> 	; 27/04/2015
   967                              <1> 	; 18/04/2015
   968                              <1> 	; 12/04/2015
   969                              <1> 	; 18/10/2014
   970                              <1> 	; 16/10/2014 (Retro UNIX 386 v1 - beginning)
   971                              <1> 	;
   972                              <1> 	; INPUT -> 
   973                              <1> 	;	[u.pgdir] = PHYSICAL (real/flat) ADDRESS of the parent's
   974                              <1> 	;		    page directory.
   975                              <1> 	; OUTPUT ->
   976                              <1> 	;	EAX =  PHYSICAL (real/flat) ADDRESS of the child's
   977                              <1> 	;	       page directory.
   978                              <1> 	;	(New page directory with new page table entries.)
   979                              <1> 	;	(New page tables with read only copies of the parent's
   980                              <1> 	;	pages.)
   981                              <1> 	;	EAX = 0 -> Error (CF = 1)
   982                              <1> 	;
   983                              <1> 	; Modified Registers -> none (except EAX)
   984                              <1> 	;
   985 00004DE6 E8ECFDFFFF          <1> 	call	allocate_page
   986 00004DEB 723E                <1> 	jc	short dpd_err
   987                              <1> 	;
   988 00004DED 55                  <1> 	push	ebp ; 20/07/2015
   989 00004DEE 56                  <1> 	push	esi
   990 00004DEF 57                  <1> 	push	edi
   991 00004DF0 53                  <1> 	push	ebx
   992 00004DF1 51                  <1> 	push	ecx
   993 00004DF2 8B35[B8030300]      <1> 	mov	esi, [u.pgdir]
   994 00004DF8 89C7                <1> 	mov	edi, eax
   995 00004DFA 50                  <1> 	push	eax ; save child's page directory address
   996                              <1> 	; 31/08/2015
   997                              <1> 	; copy PDE 0 from the parent's page dir to the child's page dir
   998                              <1> 	; (use same system space for all user page tables) 
   999 00004DFB A5                  <1> 	movsd
  1000 00004DFC BD00004000          <1> 	mov	ebp, 1024*4096 ; pass the 1st 4MB (system space)
  1001 00004E01 B9FF030000          <1> 	mov	ecx, (PAGE_SIZE / 4) - 1 ; 1023
  1002                              <1> dpd_0:	
  1003 00004E06 AD                  <1> 	lodsd
  1004                              <1> 	;or	eax, eax
  1005                              <1>         ;jnz     short dpd_1
  1006 00004E07 A801                <1> 	test	al, PDE_A_PRESENT ;  bit 0 =  1
  1007 00004E09 7508                <1> 	jnz	short dpd_1
  1008                              <1>  	; 20/07/2015 (virtual address at the end of the page table)	
  1009 00004E0B 81C500004000        <1> 	add	ebp, 1024*4096 ; page size * PTE count
  1010 00004E11 EB0F                <1> 	jmp	short dpd_2
  1011                              <1> dpd_1:	
  1012 00004E13 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear attribute bits
  1013 00004E17 89C3                <1> 	mov	ebx, eax
  1014                              <1> 	; EBX = Parent's page table address
  1015 00004E19 E81F000000          <1> 	call	duplicate_page_table
  1016 00004E1E 720C                <1> 	jc	short dpd_p_err
  1017                              <1> 	; EAX = Child's page table address
  1018 00004E20 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER
  1019                              <1> 			 ; set bit 0, bit 1 and bit 2 to 1
  1020                              <1> 			 ; (present, writable, user)
  1021                              <1> dpd_2:
  1022 00004E22 AB                  <1> 	stosd
  1023 00004E23 E2E1                <1> 	loop	dpd_0
  1024                              <1> 	;
  1025 00004E25 58                  <1> 	pop	eax  ; restore child's page directory address
  1026                              <1> dpd_3:
  1027 00004E26 59                  <1> 	pop	ecx
  1028 00004E27 5B                  <1> 	pop	ebx
  1029 00004E28 5F                  <1> 	pop	edi
  1030 00004E29 5E                  <1> 	pop	esi
  1031 00004E2A 5D                  <1> 	pop	ebp ; 20/07/2015
  1032                              <1> dpd_err:
  1033 00004E2B C3                  <1> 	retn
  1034                              <1> dpd_p_err:
  1035                              <1> 	; release the allocated pages missing (recover free space)
  1036 00004E2C 58                  <1> 	pop	eax  ; the new page directory address (physical)
  1037 00004E2D 8B1D[B8030300]      <1> 	mov	ebx, [u.pgdir] ; parent's page directory address 
  1038 00004E33 E8D8FEFFFF          <1> 	call 	deallocate_page_dir
  1039 00004E38 29C0                <1> 	sub	eax, eax ; 0
  1040 00004E3A F9                  <1> 	stc
  1041 00004E3B EBE9                <1> 	jmp	short dpd_3	
  1042                              <1> 
  1043                              <1> duplicate_page_table:
  1044                              <1> 	; 20/02/2017
  1045                              <1> 	; 21/09/2015
  1046                              <1> 	; 20/07/2015
  1047                              <1> 	; 05/05/2015
  1048                              <1> 	; 28/04/2015
  1049                              <1> 	; 27/04/2015
  1050                              <1> 	; 18/04/2015
  1051                              <1> 	; 18/10/2014
  1052                              <1> 	; 16/10/2014 (Retro UNIX 386 v1 - beginning)
  1053                              <1> 	;
  1054                              <1> 	; INPUT -> 
  1055                              <1> 	;	EBX = PHYSICAL (real/flat) ADDRESS of the parent's page table.
  1056                              <1> 	;       20/02/2017		 
  1057                              <1> 	;	EBP = Linear address of the page (from 'duplicate_page_dir')
  1058                              <1> 	;	      (Linear address = CORE + user's virtual address) 	
  1059                              <1> 	; OUTPUT ->
  1060                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS of the child's page table.
  1061                              <1> 	;	      (with 'read only' attribute of page table entries)
  1062                              <1> 	;	20/02/2017
  1063                              <1> 	;	EBP = Next linear page address (for 'duplicate_page_dir')
  1064                              <1> 	;	
  1065                              <1> 	;	CF = 1 -> error 
  1066                              <1> 	;
  1067                              <1> 	; Modified Registers -> EBP (except EAX)
  1068                              <1> 	;
  1069 00004E3D E895FDFFFF          <1> 	call	allocate_page
  1070 00004E42 726A                <1> 	jc	short dpt_err
  1071                              <1> 	;
  1072 00004E44 50                  <1> 	push	eax ; *
  1073 00004E45 56                  <1> 	push	esi
  1074 00004E46 57                  <1> 	push	edi
  1075 00004E47 52                  <1> 	push	edx
  1076 00004E48 51                  <1> 	push	ecx
  1077                              <1> 	;
  1078 00004E49 89DE                <1> 	mov	esi, ebx
  1079 00004E4B 89C7                <1> 	mov	edi, eax
  1080 00004E4D 89C2                <1> 	mov	edx, eax
  1081 00004E4F 81C200100000        <1> 	add	edx, PAGE_SIZE 	
  1082                              <1> dpt_0:
  1083 00004E55 AD                  <1> 	lodsd
  1084 00004E56 21C0                <1> 	and	eax, eax
  1085 00004E58 7444                <1> 	jz	short dpt_3
  1086 00004E5A A801                <1> 	test	al, PTE_A_PRESENT ;  bit 0 =  1
  1087 00004E5C 7507                <1> 	jnz	short dpt_1
  1088                              <1> 	; 20/07/2015
  1089                              <1> 	; ebp = virtual (linear) address of the memory page
  1090 00004E5E E83F050000          <1> 	call	reload_page ; 28/04/2015
  1091 00004E63 7244                <1> 	jc	short dpt_p_err
  1092                              <1> dpt_1:
  1093                              <1> 	; 21/09/2015
  1094 00004E65 89C1                <1> 	mov	ecx, eax
  1095 00004E67 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  1096 00004E6B F6C102              <1> 	test	cl, PTE_A_WRITE ; writable page ?
  1097 00004E6E 7525                <1> 	jnz	short dpt_2
  1098                              <1> 	; Read only (parent) page
  1099                              <1> 	; 	- there is a third process which uses this page -
  1100                              <1> 	; Allocate a new page for the child process
  1101 00004E70 E862FDFFFF          <1> 	call	allocate_page
  1102 00004E75 7232                <1> 	jc	short dpt_p_err
  1103 00004E77 57                  <1> 	push	edi
  1104 00004E78 56                  <1> 	push	esi
  1105 00004E79 89CE                <1> 	mov	esi, ecx
  1106 00004E7B 89C7                <1> 	mov	edi, eax
  1107 00004E7D B900040000          <1> 	mov	ecx, PAGE_SIZE/4
  1108 00004E82 F3A5                <1> 	rep	movsd	; copy page (4096 bytes)
  1109 00004E84 5E                  <1> 	pop	esi
  1110 00004E85 5F                  <1> 	pop	edi
  1111                              <1> 	; 
  1112 00004E86 53                  <1> 	push	ebx
  1113 00004E87 50                  <1> 	push	eax
  1114                              <1> 	; 20/07/2015
  1115 00004E88 89EB                <1> 	mov	ebx, ebp
  1116                              <1> 	; ebx = virtual (linear) address of the memory page
  1117 00004E8A E887030000          <1> 	call	add_to_swap_queue
  1118 00004E8F 58                  <1> 	pop	eax
  1119 00004E90 5B                  <1> 	pop	ebx
  1120                              <1> 	; 21/09/2015
  1121 00004E91 0C07                <1> 	or	al, PTE_A_USER+PTE_A_WRITE+PTE_A_PRESENT 
  1122                              <1> 		; user + writable + present page
  1123 00004E93 EB09                <1> 	jmp	short dpt_3
  1124                              <1> dpt_2:
  1125                              <1> 	;or	ax, PTE_A_USER+PTE_A_PRESENT 
  1126 00004E95 0C05                <1> 	or	al, PTE_A_USER+PTE_A_PRESENT 
  1127                              <1> 		    ; (read only page!)
  1128 00004E97 8946FC              <1> 	mov	[esi-4], eax ; update parent's PTE
  1129 00004E9A 660D0002            <1> 	or      ax, PTE_DUPLICATED  ; (read only page & duplicated PTE!)
  1130                              <1> dpt_3:
  1131 00004E9E AB                  <1> 	stosd  ; EDI points to child's PTE  	 
  1132                              <1> 	;
  1133 00004E9F 81C500100000        <1> 	add	ebp, 4096 ; 20/07/2015 (next page)
  1134                              <1> 	;
  1135 00004EA5 39D7                <1> 	cmp	edi, edx
  1136 00004EA7 72AC                <1> 	jb	short dpt_0
  1137                              <1> dpt_p_err:
  1138 00004EA9 59                  <1> 	pop	ecx
  1139 00004EAA 5A                  <1> 	pop	edx
  1140 00004EAB 5F                  <1> 	pop	edi
  1141 00004EAC 5E                  <1> 	pop	esi
  1142 00004EAD 58                  <1> 	pop	eax ; *
  1143                              <1> dpt_err:
  1144 00004EAE C3                  <1> 	retn
  1145                              <1> 
  1146                              <1> page_fault_handler:	; CPU EXCEPTION 0Eh (14) : Page Fault !
  1147                              <1> 	; 21/09/2015
  1148                              <1> 	; 19/09/2015
  1149                              <1> 	; 17/09/2015
  1150                              <1> 	; 28/08/2015
  1151                              <1> 	; 20/07/2015
  1152                              <1> 	; 28/06/2015
  1153                              <1> 	; 03/05/2015
  1154                              <1> 	; 30/04/2015
  1155                              <1> 	; 18/04/2015
  1156                              <1> 	; 12/04/2015
  1157                              <1> 	; 30/10/2014
  1158                              <1> 	; 11/09/2014
  1159                              <1> 	; 10/09/2014 (Retro UNIX 386 v1 - beginning)
  1160                              <1> 	;
  1161                              <1> 	; Note: This is not an interrupt/exception handler.
  1162                              <1> 	;	This is a 'page fault remedy' subroutine 
  1163                              <1> 	;	which will be called by standard/uniform
  1164                              <1> 	;	exception handler.
  1165                              <1> 	;
  1166                              <1> 	; INPUT -> 
  1167                              <1> 	;	[error_code] = 32 bit ERROR CODE (lower 5 bits are valid)
  1168                              <1> 	;
  1169                              <1> 	;	cr2 = the virtual (linear) address 
  1170                              <1> 	;	      which has caused to page fault (19/09/2015)
  1171                              <1> 	;
  1172                              <1> 	; OUTPUT ->
  1173                              <1> 	;	(corresponding PAGE TABLE ENTRY is mapped/set)
  1174                              <1> 	;	EAX = 0 -> no error
  1175                              <1> 	;	EAX > 0 -> error code in EAX (also CF = 1)
  1176                              <1> 	;
  1177                              <1> 	; Modified Registers -> none (except EAX)
  1178                              <1> 	;	
  1179                              <1>         ;
  1180                              <1>         ; ERROR CODE:
  1181                              <1> 	;	 31  .....	4   3	2   1	0
  1182                              <1> 	;	+---+-- --+---+---+---+---+---+---+
  1183                              <1> 	;	|   Reserved  | I | R | U | W | P |
  1184                              <1> 	;	+---+-- --+---+---+---+---+---+---+
  1185                              <1> 	;
  1186                              <1> 	; P : PRESENT -	When set, the page fault was caused by 
  1187                              <1>     	;		a page-protection violation. When not set,
  1188                              <1> 	;		it was caused by a non-present page.
  1189                              <1> 	; W : WRITE   -	When set, the page fault was caused by
  1190                              <1> 	;		a page write. When not set, it was caused
  1191                              <1> 	;		by a page read.
  1192                              <1> 	; U : USER    -	When set, the page fault was caused 
  1193                              <1> 	;		while CPL = 3. 
  1194                              <1> 	;		This does not necessarily mean that
  1195                              <1> 	;		the page fault was a privilege violation.
  1196                              <1> 	; R : RESERVD -	When set, the page fault was caused by
  1197                              <1> 	;     WRITE	reading a 1 in a reserved field.
  1198                              <1> 	; I : INSTRUC -	When set, the page fault was caused by
  1199                              <1> 	;     FETCH	an instruction fetch
  1200                              <1> 	;
  1201                              <1> 	;; x86 (32 bit) VIRTUAL ADDRESS TRANSLATION
  1202                              <1> 	;  31               22                  12 11                    0
  1203                              <1> 	; +-------------------+-------------------+-----------------------+
  1204                              <1>        	; | PAGE DIR. ENTRY # | PAGE TAB. ENTRY # |        OFFSET         |
  1205                              <1>        	; +-------------------+-------------------+-----------------------+
  1206                              <1> 	;
  1207                              <1> 
  1208                              <1> 	;; CR3 REGISTER (Control Register 3)
  1209                              <1> 	;  31                                   12             5 4 3 2   0
  1210                              <1> 	; +---------------------------------------+-------------+---+-----+
  1211                              <1>       	; |                                       |  		|P|P|     |
  1212                              <1>       	; |   PAGE DIRECTORY TABLE BASE ADDRESS   |  reserved	|C|W|rsvrd|
  1213                              <1>       	; |                                       | 		|D|T|     |
  1214                              <1>    	; +---------------------------------------+-------------+---+-----+
  1215                              <1> 	;
  1216                              <1> 	;	PWT    - WRITE THROUGH
  1217                              <1> 	;	PCD    - CACHE DISABLE		
  1218                              <1> 	;
  1219                              <1> 	;
  1220                              <1> 	;; x86 PAGE DIRECTORY ENTRY (4 KByte Page)
  1221                              <1> 	;  31                                   12 11  9 8 7 6 5 4 3 2 1 0
  1222                              <1> 	; +---------------------------------------+-----+---+-+-+---+-+-+-+
  1223                              <1>       	; |                                       |     | | | | |P|P|U|R| |
  1224                              <1>       	; |     PAGE TABLE BASE ADDRESS 31..12    | AVL |G|0|D|A|C|W|/|/|P|
  1225                              <1>       	; |                                       |     | | | | |D|T|S|W| |
  1226                              <1>    	; +---------------------------------------+-----+---+-+-+---+-+-+-+
  1227                              <1> 	;
  1228                              <1>         ;       P      - PRESENT
  1229                              <1>         ;       R/W    - READ/WRITE
  1230                              <1>         ;       U/S    - USER/SUPERVISOR
  1231                              <1> 	;	PWT    - WRITE THROUGH
  1232                              <1> 	;	PCD    - CACHE DISABLE	
  1233                              <1> 	;	A      - ACCESSED	
  1234                              <1>         ;       D      - DIRTY (IGNORED)
  1235                              <1> 	;	PAT    - PAGE ATTRIBUTE TABLE INDEX (CACHE BEHAVIOR)
  1236                              <1> 	;	G      - GLOBAL	(IGNORED) 
  1237                              <1>         ;       AVL    - AVAILABLE FOR SYSTEMS PROGRAMMER USE
  1238                              <1> 	;
  1239                              <1> 	;
  1240                              <1> 	;; x86 PAGE TABLE ENTRY (4 KByte Page)
  1241                              <1> 	;  31                                   12 11  9 8 7 6 5 4 3 2 1 0
  1242                              <1> 	; +---------------------------------------+-----+---+-+-+---+-+-+-+
  1243                              <1>       	; |                                       |     | |P| | |P|P|U|R| |
  1244                              <1>       	; |     PAGE FRAME BASE ADDRESS 31..12    | AVL |G|A|D|A|C|W|/|/|P|
  1245                              <1>       	; |                                       |     | |T| | |D|T|S|W| |
  1246                              <1>    	; +---------------------------------------+-----+---+-+-+---+-+-+-+
  1247                              <1> 	;
  1248                              <1>         ;       P      - PRESENT
  1249                              <1>         ;       R/W    - READ/WRITE
  1250                              <1>         ;       U/S    - USER/SUPERVISOR
  1251                              <1> 	;	PWT    - WRITE THROUGH
  1252                              <1> 	;	PCD    - CACHE DISABLE	
  1253                              <1> 	;	A      - ACCESSED	
  1254                              <1>         ;       D      - DIRTY
  1255                              <1> 	;	PAT    - PAGE ATTRIBUTE TABLE INDEX (CACHE BEHAVIOR)
  1256                              <1> 	;	G      - GLOBAL	 
  1257                              <1>         ;       AVL    - AVAILABLE FOR SYSTEMS PROGRAMMER USE
  1258                              <1> 	;
  1259                              <1> 	;
  1260                              <1> 	;; 80386 PAGE TABLE ENTRY (4 KByte Page)
  1261                              <1> 	;  31                                   12 11  9 8 7 6 5 4 3 2 1 0
  1262                              <1> 	; +---------------------------------------+-----+-+-+-+-+---+-+-+-+
  1263                              <1>       	; |                                       |     | | | | | | |U|R| |
  1264                              <1>       	; |     PAGE FRAME BASE ADDRESS 31..12    | AVL |0|0|D|A|0|0|/|/|P|
  1265                              <1>       	; |                                       |     | | | | | | |S|W| |
  1266                              <1>       	; +---------------------------------------+-----+-+-+-+-+---+-+-+-+
  1267                              <1> 	;
  1268                              <1>         ;       P      - PRESENT
  1269                              <1>         ;       R/W    - READ/WRITE
  1270                              <1>         ;       U/S    - USER/SUPERVISOR
  1271                              <1>         ;       D      - DIRTY
  1272                              <1>         ;       AVL    - AVAILABLE FOR SYSTEMS PROGRAMMER USE
  1273                              <1> 	;
  1274                              <1>         ;       NOTE: 0 INDICATES INTEL RESERVED. DO NOT DEFINE.
  1275                              <1> 	;
  1276                              <1> 	;
  1277                              <1> 	;; Invalid Page Table Entry
  1278                              <1> 	; 31                                                           1 0
  1279                              <1>       	; +-------------------------------------------------------------+-+
  1280                              <1>       	; |                                                             | |
  1281                              <1>       	; |                          AVAILABLE                          |0|
  1282                              <1>       	; |                                                             | |
  1283                              <1>       	; +-------------------------------------------------------------+-+
  1284                              <1> 	;
  1285                              <1> 
  1286 00004EAF 53                  <1> 	push	ebx
  1287 00004EB0 52                  <1> 	push	edx
  1288 00004EB1 51                  <1> 	push	ecx
  1289                              <1> 	;
  1290                              <1> 	; 21/09/2015 (debugging)
  1291 00004EB2 FF05[CC030300]      <1> 	inc	dword [u.pfcount] ; page fault count for running process
  1292 00004EB8 FF05[80050300]      <1> 	inc	dword [PF_Count] ; total page fault count	
  1293                              <1> 	; 28/06/2015
  1294                              <1> 	;mov	edx, [error_code] ; Lower 5 bits are valid
  1295 00004EBE 8A15[78050300]      <1> 	mov	dl, [error_code]
  1296                              <1> 	;
  1297 00004EC4 F6C201              <1> 	test	dl, 1	; page fault was caused by a non-present page
  1298                              <1> 			; sign
  1299 00004EC7 7422                <1> 	jz	short pfh_alloc_np
  1300                              <1> 	; 
  1301                              <1> 	; If it is not a 'write on read only page' type page fault
  1302                              <1> 	; major page fault error with minor reason must be returned without 
  1303                              <1> 	; fixing the problem. 'sys_exit with error' will be needed
  1304                              <1> 	; after return here!
  1305                              <1> 	; Page fault will be remedied, by copying page contents
  1306                              <1> 	; to newly allocated page with write permission;
  1307                              <1> 	; sys_fork -> sys_exec -> copy on write, demand paging method is 
  1308                              <1> 	; used for working with minimum possible memory usage. 
  1309                              <1> 	; sys_fork will duplicate page directory and tables of parent  
  1310                              <1> 	; process with 'read only' flag. If the child process attempts to
  1311                              <1> 	; write on these read only pages, page fault will be directed here
  1312                              <1> 	; for allocating a new page with same data/content. 
  1313                              <1> 	;
  1314                              <1> 	; IMPORTANT : Retro UNIX 386 v1 (and SINGLIX and TR-DOS)
  1315                              <1> 	; will not force to separate CODE and DATA space 
  1316                              <1> 	; in a process/program... 
  1317                              <1> 	; CODE segment/section may contain DATA!
  1318                              <1> 	; It is flat, smoth and simplest programming method already as in 
  1319                              <1> 	; Retro UNIX 8086 v1 and MS-DOS programs.
  1320                              <1> 	;	
  1321 00004EC9 F6C202              <1> 	test	dl, 2	; page fault was caused by a page write
  1322                              <1> 			; sign
  1323 00004ECC 0F84AB000000        <1>         jz      pfh_p_err
  1324                              <1> 	; 31/08/2015
  1325 00004ED2 F6C204              <1> 	test	dl, 4	; page fault was caused while CPL = 3 (user mode)
  1326                              <1> 			; sign.  (U+W+P = 4+2+1 = 7)
  1327 00004ED5 0F84A2000000        <1>         jz	pfh_pv_err
  1328                              <1> 	;
  1329                              <1> 	; make a new page and copy the parent's page content
  1330                              <1> 	; as the child's new page content
  1331                              <1> 	;
  1332 00004EDB 0F20D3              <1> 	mov	ebx, cr2 ; CR2 contains the linear address 
  1333                              <1> 			 ; which has caused to page fault
  1334 00004EDE E8A2000000          <1> 	call 	copy_page
  1335 00004EE3 0F828D000000        <1>         jc      pfh_im_err ; insufficient memory
  1336                              <1> 	;
  1337 00004EE9 EB7D                <1>         jmp     pfh_cpp_ok
  1338                              <1> 	;
  1339                              <1> pfh_alloc_np:
  1340 00004EEB E8E7FCFFFF          <1> 	call	allocate_page	; (allocate a new page)
  1341 00004EF0 0F8280000000        <1>         jc      pfh_im_err	; 'insufficient memory' error
  1342                              <1> pfh_chk_cpl:
  1343                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  1344                              <1> 		; (Lower 12 bits are ZERO, because 
  1345                              <1> 		;	the address is on a page boundary)
  1346 00004EF6 80E204              <1> 	and	dl, 4	; CPL = 3 ?
  1347 00004EF9 7505                <1> 	jnz	short pfh_um
  1348                              <1> 			; Page fault handler for kernel/system mode (CPL=0)		
  1349 00004EFB 0F20DB              <1> 	mov	ebx, cr3 ; CR3 (Control Register 3) contains physical address
  1350                              <1> 			 ; of the current/active page directory
  1351                              <1> 			 ; (Always kernel/system mode page directory, here!)
  1352                              <1> 			 ; Note: Lower 12 bits are 0. (page boundary)
  1353 00004EFE EB06                <1> 	jmp	short pfh_get_pde
  1354                              <1> 	;
  1355                              <1> pfh_um:			; Page fault handler for user/appl. mode (CPL=3)
  1356 00004F00 8B1D[B8030300]      <1>  	mov	ebx, [u.pgdir] ; Page directory of current/active process
  1357                              <1> 			; Physical address of the USER's page directory
  1358                              <1> 			; Note: Lower 12 bits are 0. (page boundary)
  1359                              <1> pfh_get_pde:
  1360 00004F06 80CA03              <1> 	or	dl, 3	; USER + WRITE + PRESENT or SYSTEM + WRITE + PRESENT
  1361 00004F09 0F20D1              <1> 	mov	ecx, cr2 ; CR2 contains the virtual address 
  1362                              <1> 			 ; which has been caused to page fault
  1363                              <1> 			 ;
  1364 00004F0C C1E914              <1> 	shr	ecx, 20	 ; shift 20 bits right
  1365 00004F0F 80E1FC              <1> 	and	cl, 0FCh ; mask lower 2 bits to get PDE offset		
  1366                              <1> 	;
  1367 00004F12 01CB                <1> 	add	ebx, ecx ; now, EBX points to the relevant page dir entry 
  1368 00004F14 8B0B                <1> 	mov	ecx, [ebx] ; physical (base) address of the page table 	
  1369 00004F16 F6C101              <1> 	test	cl, 1	 ; check bit 0 is set (1) or not (0).
  1370 00004F19 740B                <1> 	jz	short pfh_set_pde ; Page directory entry is not valid,
  1371                              <1> 			  	  ; set/validate page directory entry
  1372 00004F1B 6681E100F0          <1> 	and	cx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  1373 00004F20 89CB                <1> 	mov	ebx, ecx ; Physical address of the page table
  1374 00004F22 89C1                <1> 	mov	ecx, eax ; new page address (physical) 	
  1375 00004F24 EB16                <1> 	jmp	short pfh_get_pte
  1376                              <1> pfh_set_pde:
  1377                              <1> 	;; NOTE: Page directories and page tables never be swapped out!
  1378                              <1> 	;;	 (So, we know this PDE is empty or invalid)
  1379                              <1> 	;
  1380 00004F26 08D0                <1> 	or	al, dl	 ; lower 3 bits are used as U/S, R/W, P flags
  1381 00004F28 8903                <1> 	mov	[ebx], eax ; Let's put the new page directory entry here !
  1382 00004F2A 30C0                <1> 	xor	al, al	 ; clear lower (3..8) bits
  1383 00004F2C 89C3                <1> 	mov	ebx, eax
  1384 00004F2E E8A4FCFFFF          <1> 	call	allocate_page	 ; (allocate a new page)
  1385 00004F33 7241                <1> 	jc	short pfh_im_err   ; 'insufficient memory' error
  1386                              <1> pfh_spde_1:
  1387                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  1388 00004F35 89C1                <1> 	mov	ecx, eax
  1389 00004F37 E815FDFFFF          <1> 	call	clear_page ; Clear page content
  1390                              <1> pfh_get_pte:
  1391 00004F3C 0F20D0              <1> 	mov	eax, cr2 ; virtual address
  1392                              <1> 			 ; which has been caused to page fault
  1393 00004F3F 89C7                <1> 	mov	edi, eax ; 20/07/2015
  1394 00004F41 C1E80C              <1> 	shr	eax, 12	 ; shift 12 bit right to get 
  1395                              <1> 			 ; higher 20 bits of the page fault address 
  1396 00004F44 25FF030000          <1> 	and	eax, 3FFh ; mask PDE# bits, the result is PTE# (0 to 1023)
  1397 00004F49 C1E002              <1> 	shl	eax, 2	; shift 2 bits left to get PTE offset
  1398 00004F4C 01C3                <1> 	add	ebx, eax ; now, EBX points to the relevant page table entry 
  1399 00004F4E 8B03                <1> 	mov	eax, [ebx] ; get previous value of pte
  1400                              <1> 		; bit 0 of EAX is always 0 (otherwise we would not be here)
  1401 00004F50 21C0                <1> 	and	eax, eax
  1402 00004F52 7410                <1> 	jz	short pfh_gpte_1
  1403                              <1> 	; 20/07/2015
  1404 00004F54 87D9                <1> 	xchg	ebx, ecx ; new page address (physical)
  1405 00004F56 55                  <1> 	push	ebp ; 20/07/2015
  1406 00004F57 0F20D5              <1> 	mov	ebp, cr2
  1407                              <1> 		; ECX = physical address of the page table entry
  1408                              <1> 		; EBX = Memory page address (physical!)
  1409                              <1> 		; EAX = Swap disk (offset) address
  1410                              <1> 		; EBP = virtual address (page fault address)
  1411 00004F5A E8B7000000          <1> 	call	swap_in
  1412 00004F5F 5D                  <1> 	pop	ebp
  1413 00004F60 7210                <1> 	jc      short pfh_err_retn
  1414 00004F62 87CB                <1> 	xchg	ecx, ebx
  1415                              <1> 		; EBX = physical address of the page table entry
  1416                              <1> 		; ECX = new page
  1417                              <1> pfh_gpte_1:
  1418 00004F64 08D1                <1> 	or	cl, dl	; lower 3 bits are used as U/S, R/W, P flags
  1419 00004F66 890B                <1> 	mov	[ebx], ecx ; Let's put the new page table entry here !
  1420                              <1> pfh_cpp_ok:
  1421                              <1> 	; 20/07/2015
  1422 00004F68 0F20D3              <1> 	mov	ebx, cr2
  1423 00004F6B E8A6020000          <1> 	call 	add_to_swap_queue
  1424                              <1> 	;
  1425                              <1> 	; The new PTE (which contains the new page) will be added to 
  1426                              <1> 	; the swap queue, here. 
  1427                              <1> 	; (Later, if memory will become insufficient, 
  1428                              <1> 	; one page will be swapped out which is at the head of 
  1429                              <1> 	; the swap queue by using FIFO and access check methods.)
  1430                              <1> 	;
  1431 00004F70 31C0                <1> 	xor	eax, eax  ; 0
  1432                              <1> 	;
  1433                              <1> pfh_err_retn:
  1434 00004F72 59                  <1> 	pop	ecx
  1435 00004F73 5A                  <1> 	pop	edx
  1436 00004F74 5B                  <1> 	pop	ebx
  1437 00004F75 C3                  <1> 	retn 
  1438                              <1> 	
  1439                              <1> pfh_im_err:
  1440 00004F76 B8E4000000          <1> 	mov	eax, ERR_MAJOR_PF + ERR_MINOR_IM ; Error code in AX
  1441                              <1> 			; Major (Primary) Error: Page Fault
  1442                              <1> 			; Minor (Secondary) Error: Insufficient Memory !
  1443 00004F7B EBF5                <1> 	jmp	short pfh_err_retn
  1444                              <1> 
  1445                              <1> 
  1446                              <1> pfh_p_err: ; 09/03/2015
  1447                              <1> pfh_pv_err:
  1448                              <1> 	; Page fault was caused by a protection-violation
  1449 00004F7D B8E6000000          <1> 	mov	eax, ERR_MAJOR_PF + ERR_MINOR_PV ; Error code in AX
  1450                              <1> 			; Major (Primary) Error: Page Fault
  1451                              <1> 			; Minor (Secondary) Error: Protection violation !
  1452 00004F82 F9                  <1> 	stc
  1453 00004F83 EBED                <1> 	jmp	short pfh_err_retn
  1454                              <1> 
  1455                              <1> copy_page:
  1456                              <1> 	; 22/09/2015
  1457                              <1> 	; 21/09/2015
  1458                              <1> 	; 19/09/2015
  1459                              <1> 	; 07/09/2015
  1460                              <1> 	; 31/08/2015
  1461                              <1> 	; 20/07/2015
  1462                              <1> 	; 05/05/2015
  1463                              <1> 	; 03/05/2015
  1464                              <1> 	; 18/04/2015
  1465                              <1> 	; 12/04/2015
  1466                              <1> 	; 30/10/2014
  1467                              <1> 	; 18/10/2014 (Retro UNIX 386 v1 - beginning)
  1468                              <1> 	;
  1469                              <1> 	; INPUT -> 
  1470                              <1> 	;	EBX = Virtual (linear) address of source page
  1471                              <1> 	;	     (Page fault address)
  1472                              <1> 	; OUTPUT ->
  1473                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF THE ALLOCATED PAGE
  1474                              <1> 	;	(corresponding PAGE TABLE ENTRY is mapped/set)
  1475                              <1> 	;	EAX = 0 (CF = 1) 
  1476                              <1> 	;		if there is not a free page to be allocated
  1477                              <1> 	;	(page content of the source page will be copied
  1478                              <1> 	;	onto the target/new page) 	
  1479                              <1> 	;
  1480                              <1> 	; Modified Registers -> ecx, ebx (except EAX)
  1481                              <1> 	;	
  1482 00004F85 56                  <1> 	push	esi
  1483 00004F86 57                  <1> 	push	edi
  1484                              <1> 	;push	ebx
  1485                              <1> 	;push	ecx
  1486 00004F87 31F6                <1> 	xor 	esi, esi
  1487 00004F89 C1EB0C              <1> 	shr	ebx, 12 ; shift 12 bits right to get PDE & PTE numbers
  1488 00004F8C 89D9                <1> 	mov	ecx, ebx ; save page fault address (as 12 bit shifted)
  1489 00004F8E C1EB08              <1> 	shr	ebx, 8	 ; shift 8 bits right and then
  1490 00004F91 80E3FC              <1> 	and	bl, 0FCh ; mask lower 2 bits to get PDE offset	
  1491 00004F94 89DF                <1> 	mov 	edi, ebx ; save it for the parent of current process
  1492 00004F96 031D[B8030300]      <1> 	add	ebx, [u.pgdir] ; EBX points to the relevant page dir entry 
  1493 00004F9C 8B03                <1> 	mov	eax, [ebx] ; physical (base) address of the page table
  1494 00004F9E 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits 	
  1495 00004FA2 89CB                <1> 	mov	ebx, ecx   ; (restore higher 20 bits of page fault address)
  1496 00004FA4 81E3FF030000        <1> 	and	ebx, 3FFh  ; mask PDE# bits, the result is PTE# (0 to 1023)
  1497 00004FAA 66C1E302            <1> 	shl	bx, 2	   ; shift 2 bits left to get PTE offset
  1498 00004FAE 01C3                <1> 	add	ebx, eax   ; EBX points to the relevant page table entry 
  1499                              <1> 	; 07/09/2015
  1500 00004FB0 66F7030002          <1>         test    word [ebx], PTE_DUPLICATED ; (Does current process share this
  1501                              <1> 				     ; read only page as a child process?)	
  1502 00004FB5 7509                <1> 	jnz	short cpp_0 ; yes
  1503 00004FB7 8B0B                <1> 	mov	ecx, [ebx] ; PTE value
  1504 00004FB9 6681E100F0          <1> 	and	cx, PTE_A_CLEAR ; 0F000h  ; clear page attributes
  1505 00004FBE EB32                <1> 	jmp	short cpp_1
  1506                              <1> cpp_0:
  1507 00004FC0 89FE                <1> 	mov	esi, edi
  1508 00004FC2 0335[BC030300]      <1> 	add	esi, [u.ppgdir] ; the parent's page directory entry
  1509 00004FC8 8B06                <1> 	mov	eax, [esi] ; physical (base) address of the page table
  1510 00004FCA 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  1511 00004FCE 89CE                <1> 	mov	esi, ecx   ; (restore higher 20 bits of page fault address)	
  1512 00004FD0 81E6FF030000        <1> 	and	esi, 3FFh  ; mask PDE# bits, the result is PTE# (0 to 1023)
  1513 00004FD6 66C1E602            <1> 	shl	si, 2	   ; shift 2 bits left to get PTE offset
  1514 00004FDA 01C6                <1> 	add	esi, eax   ; EDX points to the relevant page table entry  	
  1515 00004FDC 8B0E                <1> 	mov	ecx, [esi] ; PTE value of the parent process
  1516                              <1> 	; 21/09/2015
  1517 00004FDE 8B03                <1> 	mov	eax, [ebx] ; PTE value of the child process
  1518 00004FE0 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear page attributes	
  1519                              <1> 	;
  1520 00004FE4 F6C101              <1> 	test	cl, PTE_A_PRESENT ; is it a present/valid page ?
  1521 00004FE7 7424                <1> 	jz	short cpp_3 ; the parent's page is not same page  	
  1522                              <1> 	;
  1523 00004FE9 6681E100F0          <1> 	and	cx, PTE_A_CLEAR ; 0F000h ; clear page attributes
  1524 00004FEE 39C8                <1> 	cmp	eax, ecx   ; Same page?	
  1525 00004FF0 751B                <1> 	jne	short cpp_3 ; Parent page and child page are not same 
  1526                              <1> 			    ; Convert child's page to writable page
  1527                              <1> cpp_1:
  1528 00004FF2 E8E0FBFFFF          <1> 	call	allocate_page
  1529 00004FF7 721A                <1> 	jc	short cpp_4 ; 'insufficient memory' error
  1530 00004FF9 21F6                <1> 	and	esi, esi    ; check ESI is valid or not
  1531 00004FFB 7405                <1> 	jz	short cpp_2
  1532                              <1> 		; Convert read only page to writable page 
  1533                              <1> 		;(for the parent of the current process)
  1534                              <1> 	;and	word [esi], PTE_A_CLEAR ; 0F000h
  1535                              <1> 	; 22/09/2015
  1536 00004FFD 890E                <1> 	mov	[esi], ecx
  1537 00004FFF 800E07              <1> 	or	byte [esi], PTE_A_PRESENT + PTE_A_WRITE + PTE_A_USER
  1538                              <1> 				 ; 1+2+4 = 7
  1539                              <1> cpp_2:
  1540 00005002 89C7                <1> 	mov	edi, eax ; new page address of the child process
  1541                              <1> 	; 07/09/2015
  1542 00005004 89CE                <1> 	mov	esi, ecx ; the page address of the parent process
  1543 00005006 B900040000          <1> 	mov	ecx, PAGE_SIZE / 4
  1544 0000500B F3A5                <1> 	rep	movsd ; 31/08/2015
  1545                              <1> cpp_3:		
  1546 0000500D 0C07                <1> 	or	al, PTE_A_PRESENT + PTE_A_WRITE + PTE_A_USER ; 1+2+4 = 7
  1547 0000500F 8903                <1> 	mov	[ebx], eax ; Update PTE
  1548 00005011 28C0                <1> 	sub	al, al ; clear attributes
  1549                              <1> cpp_4:
  1550                              <1> 	;pop	ecx
  1551                              <1> 	;pop	ebx
  1552 00005013 5F                  <1> 	pop	edi
  1553 00005014 5E                  <1> 	pop	esi
  1554 00005015 C3                  <1> 	retn
  1555                              <1> 
  1556                              <1> ;; 28/04/2015
  1557                              <1> ;; 24/10/2014
  1558                              <1> ;; 21/10/2014 (Retro UNIX 386 v1 - beginning)
  1559                              <1> ;; SWAP_PAGE_QUEUE (4096 bytes)
  1560                              <1> ;;
  1561                              <1> ;;   0000   0001   0002   0003   ....   1020   1021   1022   1023	
  1562                              <1> ;; +------+------+------+------+-    -+------+------+------+------+
  1563                              <1> ;; |  pg1 |  pg2 |  pg3 |  pg4 | .... |pg1021|pg1022|pg1023|pg1024|
  1564                              <1> ;; +------+------+------+------+-    -+------+------+------+------+    
  1565                              <1> ;;
  1566                              <1> ;; [swpq_last] = 0 to 4096 (step 4) -> the last position on the queue
  1567                              <1> ;;
  1568                              <1> ;; Method:
  1569                              <1> ;;	Swap page queue is a list of allocated pages with physical
  1570                              <1> ;;	addresses (system mode virtual adresses = physical addresses).
  1571                              <1> ;;	It is used for 'swap_in' and 'swap_out' procedures.
  1572                              <1> ;;	When a new page is being allocated, swap queue is updated
  1573                              <1> ;;	by 'swap_queue_shift' procedure, header of the queue (offset 0)
  1574                              <1> ;;	is checked for 'accessed' flag. If the 1st page on the queue
  1575                              <1> ;;	is 'accessed' or 'read only', it is dropped from the list;
  1576                              <1> ;;	other pages from the 2nd to the last (in [swpq_last]) shifted
  1577                              <1> ;; 	to head then the 2nd page becomes the 1st and '[swpq_last]' 
  1578                              <1> ;;	offset value becomes it's previous offset value - 4.
  1579                              <1> ;;	If the 1st page of the swap page queue is not 'accessed'	
  1580                              <1> ;;	the queue/list is not shifted.
  1581                              <1> ;;	After the queue/list shift, newly allocated page is added
  1582                              <1> ;;	to the tail of the queue at the [swpq_count*4] position.
  1583                              <1> ;;	But, if [swpq_count] > 1023, the newly allocated page
  1584                              <1> ;;	will not be added to the tail of swap page queue.  		 
  1585                              <1> ;;	
  1586                              <1> ;;	During 'swap_out' procedure, swap page queue is checked for
  1587                              <1> ;;	the first non-accessed, writable page in the list, 
  1588                              <1> ;;	from the head to the tail. The list is shifted to left 
  1589                              <1> ;;	(to the head) till a non-accessed page will be found in the list.
  1590                              <1> ;;	Then, this page	is swapped out (to disk) and then it is dropped
  1591                              <1> ;;	from the list by a final swap queue shift. [swpq_count] value
  1592                              <1> ;;	is changed. If all pages on the queue' are 'accessed', 
  1593                              <1> ;;	'insufficient memory' error will be returned ('swap_out' 
  1594                              <1> ;;	procedure will be failed)...
  1595                              <1> ;;
  1596                              <1> ;;	Note: If the 1st page of the queue is an 'accessed' page,
  1597                              <1> ;;	'accessed' flag of the page will be reset (0) and that page
  1598                              <1> ;;	(PTE) will be added to the tail of the queue after
  1599                              <1> ;;	the check, if [swpq_count] < 1023. If [swpq_count] = 1024
  1600                              <1> ;;	the queue will be rotated and the PTE in the head will be
  1601                              <1> ;;	added to the tail after resetting 'accessed' bit. 
  1602                              <1> ;;
  1603                              <1> ;;
  1604                              <1> ;;	
  1605                              <1> ;; SWAP DISK/FILE (with 4096 bytes swapped page blocks)
  1606                              <1> ;;
  1607                              <1> ;;  00000000  00000004  00000008  0000000C   ...   size-8    size-4
  1608                              <1> ;; +---------+---------+---------+---------+-- --+---------+---------+
  1609                              <1> ;; |descriptr| page(1) | page(2) | page(3) | ... |page(n-1)| page(n) |
  1610                              <1> ;; +---------+---------+---------+---------+-- --+---------+---------+    
  1611                              <1> ;;
  1612                              <1> ;; [swpd_next] = the first free block address in swapped page records
  1613                              <1> ;;    		 for next free block search by 'swap_out' procedure.
  1614                              <1> ;; [swpd_size] = swap disk/file size in sectors (512 bytes)
  1615                              <1> ;;		 NOTE: max. possible swap disk size is 1024 GB
  1616                              <1> ;; 		 (entire swap space must be accessed by using
  1617                              <1> ;;		 31 bit offset address) 
  1618                              <1> ;; [swpd_free] = free block (4096 bytes) count in swap disk/file space
  1619                              <1> ;; [swpd_start] = absolute/start address of the swap disk/file
  1620                              <1> ;;		  0 for file, or beginning sector of the swap partition
  1621                              <1> ;; [swp_drv] = logical drive description table addr. of swap disk/file
  1622                              <1> ;;
  1623                              <1> ;; 					
  1624                              <1> ;; Method:
  1625                              <1> ;;	When the memory (ram) becomes insufficient, page allocation
  1626                              <1> ;;	procedure swaps out a page from memory to the swap disk 
  1627                              <1> ;;	(partition) or swap file to get a new free page at the memory.
  1628                              <1> ;;	Swapping out is performed by using swap page queue.
  1629                              <1> ;;
  1630                              <1> ;; 	Allocation block size of swap disk/file is equal to page size
  1631                              <1> ;;	(4096 bytes). Swapping address (in sectors) is recorded
  1632                              <1> ;;	into relevant page file entry as 31 bit physical (logical)
  1633                              <1> ;;	offset address as 1 bit shifted to left for present flag (0).
  1634                              <1> ;;	Swapped page address is between 1 and swap disk/file size - 4.	  
  1635                              <1> ;;	Absolute physical (logical) address of the swapped page is 
  1636                              <1> ;;	calculated by adding offset value to the swap partition's 
  1637                              <1> ;;	start address. If the swap device (disk) is a virtual disk 
  1638                              <1> ;;	or it is a file, start address of the swap disk/volume is 0, 
  1639                              <1> ;;	and offset value is equal to absolute (physical or logical)
  1640                              <1> ;;	address/position. (It has not to be ZERO if the swap partition 
  1641                              <1> ;;	is in a partitioned virtual hard disk.) 
  1642                              <1> ;;
  1643                              <1> ;;	Note: Swap addresses are always specified/declared in sectors, 
  1644                              <1> ;;	not in bytes or	in blocks/zones/clusters (4096 bytes) as unit.
  1645                              <1> ;;
  1646                              <1> ;;	Swap disk/file allocation is mapped via 'Swap Allocation Table'
  1647                              <1> ;;	at memory as similar to 'Memory Allocation Table'.
  1648                              <1> ;;
  1649                              <1> ;;	Every bit of Swap Allocation Table repsesents one swap block
  1650                              <1> ;;	(equal to page size) respectively. Bit 0 of the S.A.T. byte 0
  1651                              <1> ;;	is reserved for swap disk/file block 0 as descriptor block
  1652                              <1> ;;	(also for compatibility with PTE). If bit value is ZERO,
  1653                              <1> ;;	it means relevant (respective) block is in use, and, 
  1654                              <1> ;;	of course, if bit value is 1, it means relevant (respective)
  1655                              <1> ;;      swap disk/file block is free.
  1656                              <1> ;;	For example: bit 1 of the byte 128 repsesents block 1025 
  1657                              <1> ;;	(128*8+1) or sector (offset) 8200 on the swap disk or
  1658                              <1> ;;	byte (offset/position) 4198400 in the swap file. 
  1659                              <1> ;;	4GB swap space is represented via 128KB Swap Allocation Table.
  1660                              <1> ;;	Initial layout of Swap Allocation Table is as follows:
  1661                              <1> ;;	------------------------------------------------------------
  1662                              <1> ;;	0111111111111111111111111 .... 11111111111111111111111111111
  1663                              <1> ;;	------------------------------------------------------------
  1664                              <1> ;;	(0 is reserved block, 1s represent free blocks respectively.)
  1665                              <1> ;;	(Note: Allocation cell/unit of the table is bit, not byte)
  1666                              <1> ;;
  1667                              <1> ;;	..............................................................
  1668                              <1> ;;
  1669                              <1> ;;	'swap_out' procedure checks 'free_swap_blocks' count at first,
  1670                              <1> ;;	then it searches Swap Allocation Table if free count is not
  1671                              <1> ;;	zero. From begining the [swpd_next] dword value, the first bit 
  1672                              <1> ;;	position with value of 1 on the table is converted to swap
  1673                              <1> ;;	disk/file offset address, in sectors (not 4096 bytes block).
  1674                              <1> ;;	'ldrv_write' procedure is called with ldrv (logical drive
  1675                              <1> ;;	number of physical swap disk or virtual swap disk)
  1676                              <1> ;;	number, sector offset (not absolute sector -LBA- number),
  1677                              <1> ;;	and sector count (8, 512*8 = 4096) and buffer adress
  1678                              <1> ;;	(memory page). That will be a direct disk write procedure.
  1679                              <1> ;;	(for preventing late memory allocation, significant waiting). 
  1680                              <1> ;;	If disk write procedure returns with error or free count of 
  1681                              <1> ;;	swap blocks is ZERO, 'swap_out' procedure will return with
  1682                              <1> ;;	'insufficient memory error' (cf=1). 
  1683                              <1> ;;
  1684                              <1> ;;	(Note: Even if free swap disk/file blocks was not zero,
  1685                              <1> ;;	any disk write error will not be fixed by 'swap_out' procedure,
  1686                              <1> ;;	in other words, 'swap_out' will not check the table for other
  1687                              <1> ;;	free blocks after a disk write error. It will return to 
  1688                              <1> ;;	the caller with error (CF=1) which means swapping is failed. 
  1689                              <1> ;;
  1690                              <1> ;;	After writing the page on to swap disk/file address/sector,
  1691                              <1> ;;	'swap_out' procesure returns with that swap (offset) sector
  1692                              <1> ;;	address (cf=0). 
  1693                              <1> ;;
  1694                              <1> ;;	..............................................................
  1695                              <1> ;;
  1696                              <1> ;;	'swap_in' procedure loads addressed (relevant) swap disk or
  1697                              <1> ;;	file sectors at specified memory page. Then page allocation
  1698                              <1> ;;	procedure updates relevant page table entry with 'present' 
  1699                              <1> ;;	attribute. If swap disk or file reading fails there is nothing
  1700                              <1> ;;	to do, except to terminate the process which is the owner of
  1701                              <1> ;;	the swapped page.
  1702                              <1> ;;
  1703                              <1> ;;	'swap_in' procedure sets the relevant/respective bit value
  1704                              <1> ;;	in the Swap Allocation Table (as free block). 'swap_in' also
  1705                              <1> ;;	updates [swpd_first] pointer if it is required.
  1706                              <1> ;;
  1707                              <1> ;;	..............................................................	 
  1708                              <1> ;;
  1709                              <1> ;;	Note: If [swap_enabled] value is ZERO, that means there is not
  1710                              <1> ;;	a swap disk or swap file in use... 'swap_in' and 'swap_out'
  1711                              <1> ;;	procedures ans 'swap page que' procedures will not be active...
  1712                              <1> ;;	'Insufficient memory' error will be returned by 'swap_out'
  1713                              <1> ;;	and 'general protection fault' will be returned by 'swap_in'
  1714                              <1> ;;	procedure, if it is called mistakenly (a wrong value in a PTE).		
  1715                              <1> ;;
  1716                              <1> 
  1717                              <1> swap_in:
  1718                              <1> 	; 31/08/2015
  1719                              <1> 	; 20/07/2015
  1720                              <1> 	; 28/04/2015
  1721                              <1> 	; 18/04/2015
  1722                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  1723                              <1> 	;
  1724                              <1> 	; INPUT -> 
  1725                              <1> 	;	EBX = PHYSICAL (real/flat) ADDRESS OF THE MEMORY PAGE
  1726                              <1> 	;	EBP = VIRTUAL (LINEAR) ADDRESS (page fault address)
  1727                              <1> 	;	EAX = Offset Address for the swapped page on the
  1728                              <1> 	;	      swap disk or in the swap file.
  1729                              <1> 	;
  1730                              <1> 	; OUTPUT ->
  1731                              <1> 	;	EAX = 0 if loading at memory has been successful
  1732                              <1> 	;
  1733                              <1> 	;	CF = 1 -> swap disk reading error (disk/file not present
  1734                              <1> 	;		  or sector not present or drive not ready
  1735                              <1> 	;	     EAX = Error code
  1736                              <1> 	;	     [u.error] = EAX 
  1737                              <1> 	;		       = The last error code for the process
  1738                              <1> 	;		         (will be reset after returning to user)	  
  1739                              <1> 	;
  1740                              <1> 	; Modified Registers -> EAX
  1741                              <1> 	;
  1742                              <1> 
  1743 00005016 833D[62050300]00    <1>         cmp     dword [swp_drv], 0
  1744 0000501D 7646                <1> 	jna	short swpin_dnp_err
  1745                              <1> 
  1746 0000501F 3B05[66050300]      <1> 	cmp	eax, [swpd_size]
  1747 00005025 734A                <1> 	jnb	short swpin_snp_err
  1748                              <1> 
  1749 00005027 56                  <1> 	push	esi
  1750 00005028 53                  <1> 	push	ebx
  1751 00005029 51                  <1> 	push	ecx
  1752 0000502A 8B35[62050300]      <1> 	mov	esi, [swp_drv]	
  1753 00005030 B908000000          <1> 	mov	ecx, PAGE_SIZE / LOGIC_SECT_SIZE  ; 8 !
  1754                              <1> 		; Note: Even if corresponding physical disk's sector 
  1755                              <1> 		; size different than 512 bytes, logical disk sector
  1756                              <1> 		; size is 512 bytes and disk reading procedure
  1757                              <1> 		; will be performed for reading 4096 bytes
  1758                              <1> 		; (2*2048, 8*512). 
  1759                              <1> 	; ESI = Logical disk description table address
  1760                              <1> 	; EBX = Memory page (buffer) address (physical!)
  1761                              <1> 	; EAX = Sector adress (offset address, logical sector number)
  1762                              <1> 	; ECX = Sector count ; 8 sectors
  1763 00005035 50                  <1> 	push	eax
  1764 00005036 E8AF020000          <1> 	call	logical_disk_read
  1765 0000503B 58                  <1> 	pop	eax
  1766 0000503C 730C                <1> 	jnc	short swpin_read_ok
  1767                              <1> 	;
  1768 0000503E B828000000          <1> 	mov	eax, SWP_DISK_READ_ERR ; drive not ready or read error
  1769 00005043 A3[C8030300]        <1> 	mov	[u.error], eax
  1770 00005048 EB17                <1> 	jmp	short swpin_retn
  1771                              <1> 	;
  1772                              <1> swpin_read_ok:
  1773                              <1> 	; EAX = Offset address (logical sector number)
  1774 0000504A E80D020000          <1> 	call	unlink_swap_block  ; Deallocate swap block	
  1775                              <1> 	;
  1776                              <1> 	; EBX = Memory page (buffer) address (physical!)
  1777                              <1> 	; 20/07/2015
  1778 0000504F 89EB                <1> 	mov	ebx, ebp ; virtual address (page fault address)
  1779 00005051 6681E300F0          <1>         and     bx, ~PAGE_OFF ; ~0FFFh ; reset bits, 0 to 11
  1780 00005056 8A1D[B3030300]      <1> 	mov	bl, [u.uno] ; current process number
  1781                              <1> 	; EBX = Virtual (Linear) address & process number combination
  1782 0000505C E8DB000000          <1> 	call	swap_queue_shift
  1783                              <1> 	; eax = 0 ; 10/06/2016 (if ebx input > 0, eax output = 0)
  1784                              <1> 	;sub	eax, eax  ; 0 ; Error Code = 0  (no error)
  1785                              <1> 	; zf = 1
  1786                              <1> swpin_retn:
  1787 00005061 59                  <1> 	pop	ecx
  1788 00005062 5B                  <1> 	pop	ebx
  1789 00005063 5E                  <1> 	pop	esi
  1790 00005064 C3                  <1> 	retn
  1791                              <1> 
  1792                              <1> swpin_dnp_err:
  1793 00005065 B829000000          <1> 	mov	eax, SWP_DISK_NOT_PRESENT_ERR
  1794                              <1> swpin_err_retn:
  1795 0000506A A3[C8030300]        <1> 	mov	[u.error], eax
  1796 0000506F F9                  <1> 	stc
  1797 00005070 C3                  <1> 	retn
  1798                              <1> 
  1799                              <1> swpin_snp_err:
  1800 00005071 B82A000000          <1> 	mov	eax, SWP_SECTOR_NOT_PRESENT_ERR
  1801 00005076 EBF2                <1> 	jmp	short swpin_err_retn
  1802                              <1> 
  1803                              <1> swap_out:
  1804                              <1> 	; 10/06/2016
  1805                              <1> 	; 07/06/2016
  1806                              <1>         ; 23/05/2016
  1807                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
  1808                              <1> 	; 24/10/2014 - 31/08/2015 (Retro UNIX 386 v1)
  1809                              <1> 	;
  1810                              <1> 	; INPUT -> 
  1811                              <1> 	;	none
  1812                              <1> 	;
  1813                              <1> 	; OUTPUT ->
  1814                              <1> 	;	EAX = Physical page address (which is swapped out
  1815                              <1> 	;	      for allocating a new page)
  1816                              <1> 	;	CF = 1 -> swap disk writing error (disk/file not present
  1817                              <1> 	;		  or sector not present or drive not ready
  1818                              <1> 	;	     EAX = Error code
  1819                              <1> 	;	     [u.error] = EAX 
  1820                              <1> 	;		       = The last error code for the process
  1821                              <1> 	;		         (will be reset after returning to user)	  
  1822                              <1> 	;
  1823                              <1> 	; Modified Registers -> none (except EAX)
  1824                              <1> 	;
  1825 00005078 66833D[60050300]01  <1> 	cmp 	word [swpq_count], 1
  1826 00005080 0F82AF000000        <1>         jc      swpout_im_err ; 'insufficient memory'
  1827                              <1> 
  1828                              <1>         ;cmp    dword [swp_drv], 1
  1829                              <1> 	;jc	short swpout_dnp_err ; 'swap disk/file not present'
  1830                              <1> 
  1831 00005086 833D[6A050300]01    <1>         cmp     dword [swpd_free], 1
  1832 0000508D 0F828F000000        <1>         jc      swpout_nfspc_err ; 'no free space on swap disk'
  1833                              <1> 
  1834 00005093 53                  <1> 	push	ebx ; *
  1835                              <1> swpout_1:
  1836                              <1> 	; 10/06/2016
  1837 00005094 31DB                <1> 	xor	ebx, ebx ; shift the queue and return a PTE value
  1838 00005096 E8A1000000          <1> 	call	swap_queue_shift
  1839 0000509B 21C0                <1> 	and	eax, eax	; 0 = empty queue (improper entries)
  1840 0000509D 0F848A000000        <1>         jz      swpout_npts_err        ; There is not any proper PTE
  1841                              <1> 				       ; pointer in the swap queue
  1842                              <1> 	; EAX = PTE value of the page
  1843                              <1> 	; EBX = PTE address of the page
  1844 000050A3 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  1845                              <1> 	;
  1846                              <1> 	; 07/06/2016
  1847                              <1> 	; 19/05/2016
  1848                              <1> 	; check this page is in timer events or not
  1849                              <1> 	
  1850                              <1> swpout_timer_page_0:
  1851 000050A7 52                  <1> 	push	edx ; **
  1852                              <1> 
  1853                              <1> 	; 07/06/2016
  1854 000050A8 803D[53650100]00    <1> 	cmp	byte [timer_events], 0 
  1855 000050AF 762F                <1> 	jna	short swpout_2
  1856                              <1> 	;
  1857 000050B1 8A15[53650100]      <1> 	mov	dl, [timer_events]
  1858                              <1> 
  1859 000050B7 51                  <1> 	push	ecx ; ***
  1860 000050B8 53                  <1> 	push	ebx ; ****
  1861 000050B9 BB[60040300]        <1> 	mov	ebx, timer_set ; beginning address of timer event
  1862                              <1> 			       ; structures 
  1863                              <1> swpout_timer_page_1:
  1864 000050BE 8A0B                <1> 	mov	cl, [ebx]
  1865 000050C0 08C9                <1> 	or	cl, cl ; 0 = free, >0 = process number
  1866 000050C2 7415                <1> 	jz	short swpout_timer_page_3
  1867 000050C4 8B4B0C              <1> 	mov	ecx, [ebx+12] ; response (signal return) address
  1868 000050C7 6681E100F0          <1> 	and	cx, PTE_A_CLEAR ; clear offset part (right 12 bits)
  1869                              <1> 				; of the response byte address, to
  1870                              <1> 				; get beginning of the page address)
  1871 000050CC 39C8                <1> 	cmp	eax, ecx
  1872 000050CE 7505                <1> 	jne	short swpout_timer_page_2 ; not same page
  1873                              <1> 	
  1874                              <1> 	; !same page!
  1875                              <1> 	;
  1876                              <1> 	; NOTE: // 19/05/2016 // - TRDOS 386 feature only ! -
  1877                              <1> 	; This page will be used by the kernel to put timer event
  1878                              <1> 	; response (signal return) byte at the requested address;
  1879                              <1> 	; in order to prevent a possible wrong write (while
  1880                              <1> 	; this page is swapped out) on physical memory,
  1881                              <1> 	; we must protect this page against to be swapped out!
  1882                              <1> 	;
  1883 000050D0 5B                  <1> 	pop	ebx ; ****
  1884 000050D1 59                  <1> 	pop	ecx ; ***
  1885 000050D2 5A                  <1> 	pop	edx ; **
  1886 000050D3 EBBF                <1> 	jmp	short swpout_1	; do not swap out this page !
  1887                              <1>  
  1888                              <1> swpout_timer_page_2:
  1889                              <1> 	; 07/06/2016
  1890 000050D5 FECA                <1> 	dec	dl
  1891 000050D7 7405                <1> 	jz	short swpout_timer_page_4
  1892                              <1> swpout_timer_page_3:
  1893                              <1> 	;cmp	ebx, timer_set + 240 ; last timer event (15*16) 
  1894                              <1> 	;jnb	short swpout_timer_page_4
  1895 000050D9 83C310              <1> 	add	ebx, 16
  1896 000050DC EBE0                <1> 	jmp	short swpout_timer_page_1	
  1897                              <1> 
  1898                              <1> swpout_timer_page_4:
  1899 000050DE 5B                  <1> 	pop	ebx ; ****
  1900 000050DF 59                  <1> 	pop	ecx ; ***
  1901                              <1> swpout_2:
  1902 000050E0 89DA                <1> 	mov	edx, ebx	       ; Page table entry address	
  1903 000050E2 89C3                <1> 	mov	ebx, eax	       ; Buffer (Page) Address				
  1904                              <1> 	;
  1905 000050E4 E8A6010000          <1> 	call	link_swap_block
  1906 000050E9 7304                <1> 	jnc	short swpout_3	       ; It may not be needed here	
  1907                              <1> 				       ; because [swpd_free] value
  1908                              <1> 				       ; was checked at the beginging. 	
  1909 000050EB 5A                  <1> 	pop	edx ; **
  1910 000050EC 5B                  <1> 	pop	ebx ; *
  1911 000050ED EB33                <1> 	jmp	short swpout_nfspc_err 
  1912                              <1> swpout_3:
  1913 000050EF A900000080          <1> 	test	eax, 80000000h ; test bit 31 (this may not be needed!)
  1914 000050F4 752C                <1> 	jnz	short swpout_nfspc_err  ; 10/06/2016 (bit 31 = 1 !)
  1915                              <1> 	;	
  1916 000050F6 56                  <1> 	push	esi ; **
  1917 000050F7 51                  <1> 	push	ecx ; ***
  1918 000050F8 50                  <1> 	push	eax ; sector address ; (31 bit !, bit 31 = 0)
  1919 000050F9 8B35[62050300]      <1> 	mov	esi, [swp_drv]	
  1920 000050FF B908000000          <1> 	mov	ecx, PAGE_SIZE / LOGIC_SECT_SIZE  ; 8 !
  1921                              <1> 		; Note: Even if corresponding physical disk's sector 
  1922                              <1> 		; size different than 512 bytes, logical disk sector
  1923                              <1> 		; size is 512 bytes and disk writing procedure
  1924                              <1> 		; will be performed for writing 4096 bytes
  1925                              <1> 		; (2*2048, 8*512). 
  1926                              <1> 	; ESI = Logical disk description table address
  1927                              <1> 	; EBX = Buffer (Page) address
  1928                              <1> 	; EAX = Sector adress (offset address, logical sector number)
  1929                              <1> 	; ECX = Sector count ; 8 sectors
  1930                              <1> 	; edx = PTE address
  1931 00005104 E8E2010000          <1> 	call	logical_disk_write
  1932                              <1> 	; edx = PTE address
  1933 00005109 59                  <1> 	pop	ecx ; sector address	
  1934 0000510A 730C                <1> 	jnc	short swpout_write_ok
  1935                              <1> 	;
  1936                              <1> 	;; call	unlink_swap_block ; this block must be left as 'in use'
  1937                              <1> swpout_dw_err:
  1938 0000510C B82C000000          <1> 	mov	eax, SWP_DISK_WRITE_ERR ; drive not ready or write error
  1939 00005111 A3[C8030300]        <1> 	mov	[u.error], eax
  1940 00005116 EB06                <1> 	jmp	short swpout_retn
  1941                              <1> 	;
  1942                              <1> swpout_write_ok:
  1943                              <1> 	; EBX = Buffer (page) address
  1944                              <1> 	; EDX = Page Table Entry address
  1945                              <1> 	; ECX = Swap disk sector (file block) address (31 bit)
  1946 00005118 D1E1                <1> 	shl 	ecx, 1  ; 31 bit sector address from bit 1 to bit 31 
  1947 0000511A 890A                <1> 	mov 	[edx], ecx 
  1948                              <1> 		; bit 0 = 0 (swapped page)
  1949 0000511C 89D8                <1> 	mov	eax, ebx
  1950                              <1> swpout_retn:
  1951 0000511E 59                  <1> 	pop	ecx ; ***
  1952 0000511F 5E                  <1> 	pop	esi ; **
  1953 00005120 5B                  <1> 	pop	ebx ; *
  1954 00005121 C3                  <1> 	retn
  1955                              <1> 
  1956                              <1> ;swpout_dnp_err:
  1957                              <1> ;	mov	eax, SWP_DISK_NOT_PRESENT_ERR ; disk not present
  1958                              <1> ;	jmp	short swpout_err_retn
  1959                              <1> swpout_nfspc_err:
  1960 00005122 B82B000000          <1> 	mov	eax, SWP_NO_FREE_SPACE_ERR ; no free space
  1961                              <1> swpout_err_retn:
  1962 00005127 A3[C8030300]        <1> 	mov	[u.error], eax
  1963                              <1> 	;stc
  1964 0000512C C3                  <1> 	retn
  1965                              <1> swpout_npts_err:
  1966 0000512D B82D000000          <1> 	mov	eax, SWP_NO_PAGE_TO_SWAP_ERR
  1967 00005132 5B                  <1> 	pop	ebx
  1968 00005133 EBF2                <1> 	jmp	short swpout_err_retn
  1969                              <1> swpout_im_err:
  1970 00005135 B804000000          <1> 	mov	eax, ERR_MINOR_IM ; insufficient (out of) memory
  1971 0000513A EBEB                <1> 	jmp	short swpout_err_retn
  1972                              <1> 
  1973                              <1> swap_queue_shift:
  1974                              <1> 	; 26/03/2017
  1975                              <1> 	; 10/06/2016
  1976                              <1> 	; 09/06/2016 - TRDOS 386 (TRDOS v2.0)
  1977                              <1> 	; 23/10/2014 - 20/07/2015 (Retro UNIX 386 v1)
  1978                              <1> 	;
  1979                              <1> 	; INPUT ->
  1980                              <1> 	;	EBX = Virtual (linear) address (bit 12 to 31) 
  1981                              <1> 	;	      and process number combination (bit 0 to 11)
  1982                              <1> 	;	EBX = 0 -> shift/drop from the head (offset 0)
  1983                              <1> 	;	
  1984                              <1> 	; OUTPUT ->
  1985                              <1> 	;	If EBX input > 0 
  1986                              <1> 	;	   the queue will be shifted 4 bytes (dword),
  1987                              <1> 	; 	   from the tail to the head, up to entry offset
  1988                              <1> 	; 	   which points to EBX input value or nothing
  1989                              <1> 	;	   to do if EBX value is not found on the queue.
  1990                              <1> 	;	   (The entry -with EBX value- will be removed
  1991                              <1> 	;	   from the queue if it is found.)
  1992                              <1> 	;
  1993                              <1> 	;	   EAX = 0		
  1994                              <1> 	;
  1995                              <1> 	;	If EBX input = 0
  1996                              <1> 	;	   the queue will be shifted 4 bytes (dword),
  1997                              <1> 	; 	   from the tail to the head, if the PTE address
  1998                              <1> 	;	   which is pointed in head of the queue is marked
  1999                              <1> 	;	   as "accessed" or it is marked as "non present".
  2000                              <1> 	;	   (If "accessed" flag of the PTE -which is pointed
  2001                              <1> 	;	   in the head- is set -to 1-, it will be reset
  2002                              <1> 	;	   -to 0- and then, the queue will be rotated 
  2003                              <1> 	;	   -without dropping pointer of the PTE from 
  2004                              <1> 	;	   the queue- for 4 bytes on head to tail direction.
  2005                              <1> 	;	   Pointer in the head will be moved into the tail,
  2006                              <1> 	;	   other PTEs will be shifted on head direction.)
  2007                              <1> 	;
  2008                              <1> 	;	   Swap queue will be shifted up to the first
  2009                              <1> 	;	   'present' or 'non accessed' page will be found
  2010                              <1> 	;	   (as pointed) on the queue head (then it will be
  2011                              <1>         ;          removed/dropped from the queue).
  2012                              <1> 	;
  2013                              <1> 	;	   EAX (> 0) = PTE value of the page which is
  2014                              <1> 	;		 (it's pointer -virtual address-) dropped
  2015                              <1> 	;		 (removed) from swap queue.
  2016                              <1> 	;	   EBX = PTE address of the page (if EAX > 0)
  2017                              <1> 	;	         which is (it's pointer -virtual address-)
  2018                              <1> 	;		 dropped (removed) from swap queue.
  2019                              <1> 	;
  2020                              <1> 	;	   EAX = 0 -> empty swap queue ! 
  2021                              <1> 	;
  2022                              <1> 	; Modified Registers -> EAX, EBX
  2023                              <1> 	;
  2024 0000513C 0FB705[60050300]    <1> 	movzx   eax, word [swpq_count]  ; Max. 1024
  2025 00005143 6621C0              <1> 	and	ax, ax
  2026 00005146 7431                <1> 	jz	short swpqs_retn
  2027 00005148 57                  <1> 	push	edi
  2028 00005149 56                  <1> 	push	esi
  2029 0000514A 51                  <1> 	push	ecx
  2030 0000514B BE00E00800          <1> 	mov	esi, swap_queue
  2031 00005150 89C1                <1> 	mov	ecx, eax
  2032 00005152 09DB                <1> 	or	ebx, ebx
  2033 00005154 7424                <1> 	jz	short swpqs_7
  2034                              <1> swpqs_1:
  2035 00005156 AD                  <1> 	lodsd
  2036 00005157 39D8                <1> 	cmp	eax, ebx
  2037 00005159 7406                <1> 	je	short swpqs_2
  2038 0000515B E2F9                <1> 	loop	swpqs_1
  2039                              <1> 	; 10/06/2016
  2040 0000515D 29C0                <1> 	sub	eax, eax 
  2041 0000515F EB15                <1> 	jmp	short swpqs_6
  2042                              <1> swpqs_2:
  2043 00005161 89F7                <1> 	mov	edi, esi
  2044 00005163 83EF04              <1> 	sub 	edi, 4
  2045                              <1> swpqs_3:
  2046 00005166 66FF0D[60050300]    <1> 	dec	word [swpq_count]
  2047 0000516D 7403                <1> 	jz	short swpqs_5
  2048                              <1> swpqs_4:
  2049 0000516F 49                  <1> 	dec 	ecx
  2050 00005170 F3A5                <1> 	rep	movsd	; shift up (to the head)
  2051                              <1> swpqs_5:
  2052 00005172 31C0                <1> 	xor	eax, eax
  2053 00005174 8907                <1> 	mov	[edi], eax
  2054                              <1> swpqs_6:
  2055 00005176 59                  <1> 	pop	ecx
  2056 00005177 5E                  <1> 	pop	esi
  2057 00005178 5F                  <1> 	pop	edi
  2058                              <1> swpqs_retn:
  2059 00005179 C3                  <1> 	retn		
  2060                              <1> swpqs_7:
  2061 0000517A 89F7                <1> 	mov	edi, esi ; head
  2062 0000517C AD                  <1> 	lodsd
  2063                              <1> 	; 20/07/2015
  2064 0000517D 89C3                <1> 	mov	ebx, eax
  2065 0000517F 81E300F0FFFF        <1> 	and	ebx, ~PAGE_OFF ; ~0FFFh 
  2066                              <1> 		      ; ebx = virtual address (at page boundary)	
  2067 00005185 25FF0F0000          <1> 	and	eax, PAGE_OFF ; 0FFFh
  2068                              <1> 		      ; ax = process number (1 to 4095)
  2069 0000518A 3A05[B3030300]      <1> 	cmp	al, [u.uno]
  2070                              <1> 		; Max. 16 (nproc) processes for Retro UNIX 386 v1
  2071 00005190 7507                <1> 	jne	short swpqs_8
  2072 00005192 A1[B8030300]        <1> 	mov	eax, [u.pgdir]
  2073 00005197 EB28                <1> 	jmp	short swpqs_9
  2074                              <1> swpqs_8:
  2075                              <1> 	; 09/06/2016
  2076 00005199 80B8[AF000300]00    <1> 	cmp	byte [eax+p.stat-1], 0
  2077 000051A0 76C4                <1> 	jna	short swpqs_3     ; free (or terminated) process
  2078 000051A2 80B8[AF000300]02    <1> 	cmp	byte [eax+p.stat-1], 2 ; waiting
  2079 000051A9 77BB                <1> 	ja	short swpqs_3 	  ; zombie (3) or undefined ?	
  2080                              <1> 
  2081                              <1> 	;shl	ax, 2
  2082 000051AB C0E002              <1> 	shl	al, 2
  2083 000051AE 8B80[BC000300]      <1> 	mov 	eax, [eax+p.upage-4]
  2084 000051B4 09C0                <1> 	or	eax, eax
  2085 000051B6 74AE                <1> 	jz	short swpqs_3 ; invalid upage
  2086 000051B8 83C05C              <1> 	add	eax, u.pgdir - user
  2087                              <1> 			 ; u.pgdir value for the process
  2088                              <1> 			 ; is in [eax]
  2089 000051BB 8B00                <1> 	mov	eax, [eax]
  2090 000051BD 21C0                <1> 	and	eax, eax
  2091 000051BF 74A5                <1> 	jz	short swpqs_3 ; invalid page directory
  2092                              <1> swpqs_9:
  2093 000051C1 52                  <1> 	push	edx
  2094                              <1> 	; eax = page directory
  2095                              <1> 	; ebx = virtual address
  2096 000051C2 E82BFBFFFF          <1> 	call	get_pte
  2097 000051C7 89D3                <1> 	mov	ebx, edx	; PTE address
  2098 000051C9 5A                  <1> 	pop	edx
  2099                              <1> 	; 10/06/2016
  2100 000051CA 723A                <1> 	jc	short swpqs_13 ; empty PDE
  2101                              <1> 	; EAX = PTE value
  2102 000051CC A801                <1> 	test	al, PTE_A_PRESENT ; bit 0 = 1
  2103 000051CE 7436                <1> 	jz	short swpqs_13  ; Drop non-present page
  2104                              <1> 			        ; from the queue (head)
  2105 000051D0 A802                <1> 	test	al, PTE_A_WRITE	; bit 1 = 0 (read only)
  2106 000051D2 7432                <1> 	jz	short swpqs_13  ; Drop read only page
  2107                              <1> 			        ; from the queue (head) 	
  2108                              <1> 	;test	al, PTE_A_ACCESS ; bit 5 = 1 (Accessed)
  2109                              <1> 	;jnz	short swpqs_11  ; present
  2110                              <1> 			        ; accessed page
  2111 000051D4 0FBAF005            <1>         btr     eax, PTE_A_ACCESS_BIT ; reset 'accessed' bit
  2112 000051D8 7210                <1> 	jc	short swpqs_11  ; accessed page
  2113                              <1> 
  2114 000051DA 49                  <1> 	dec	ecx
  2115 000051DB 66890D[60050300]    <1> 	mov	[swpq_count], cx
  2116 000051E2 7402                <1>         jz      short swpqs_10
  2117                              <1> 		; esi = head + 4
  2118                              <1> 		; edi = head
  2119 000051E4 F3A5                <1> 	rep	movsd	 ; n = 1 to k-1, [n - 1] = [n]
  2120                              <1> swpqs_10:
  2121 000051E6 890F                <1> 	mov	[edi], ecx ; 0
  2122 000051E8 EB8C                <1> 	jmp	short swpqs_6 ; 26/03/2017
  2123                              <1> 
  2124                              <1> swpqs_11:
  2125 000051EA 8903                <1> 	mov	[ebx], eax     ; save changed attribute
  2126                              <1> 	; Rotation (head -> tail)
  2127 000051EC 49                  <1> 	dec	ecx     ; entry count -> last entry number		
  2128 000051ED 74F7                <1> 	jz	short swpqs_10
  2129                              <1> 		; esi = head + 4
  2130                              <1> 		; edi = head
  2131 000051EF 8B07                <1> 	mov	eax, [edi] ; 20/07/2015
  2132 000051F1 F3A5                <1> 	rep	movsd	 ; n = 1 to k-1, [n - 1] = [n]
  2133 000051F3 8907                <1> 	mov	[edi], eax ; head -> tail ; [k] = [1]
  2134                              <1> 
  2135 000051F5 668B0D[60050300]    <1> 	mov	cx, [swpq_count]
  2136                              <1> 
  2137                              <1> swpqs_12:
  2138 000051FC BE00E00800          <1> 	mov	esi, swap_queue ; head
  2139 00005201 E974FFFFFF          <1>         jmp     swpqs_7
  2140                              <1> 
  2141                              <1> swpqs_13:
  2142 00005206 49                  <1> 	dec	ecx
  2143 00005207 66890D[60050300]    <1> 	mov	[swpq_count], cx
  2144 0000520E 0F845EFFFFFF        <1>         jz      swpqs_5
  2145 00005214 EBE6                <1> 	jmp	short swpqs_12
  2146                              <1> 
  2147                              <1> add_to_swap_queue:
  2148                              <1> ; temporary - 16/09/2015
  2149 00005216 C3                  <1> retn
  2150                              <1> 	; 20/02/2017
  2151                              <1> 	; 20/07/2015
  2152                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  2153                              <1> 	;
  2154                              <1> 	; Adds new page to swap queue
  2155                              <1> 	; (page directories and page tables must not be added
  2156                              <1> 	; to swap queue)	
  2157                              <1> 	;
  2158                              <1> 	; INPUT ->
  2159                              <1> 	;	EBX = Linear (Virtual) addr for current process
  2160                              <1> 	;	[u.uno]
  2161                              <1> 	;	20/02/2017
  2162                              <1> 	;	(Linear address = CORE + user's virtual address)
  2163                              <1> 	;
  2164                              <1> 	; OUTPUT ->
  2165                              <1> 	;	EAX = [swpq_count]
  2166                              <1> 	;	      (after the PTE has been added)
  2167                              <1> 	;	EAX = 0 -> Swap queue is full, (1024 entries)
  2168                              <1> 	;	      the PTE could not be added.
  2169                              <1> 	;
  2170                              <1> 	; Modified Registers -> EAX
  2171                              <1> 	;
  2172 00005217 53                  <1> 	push	ebx
  2173 00005218 6681E300F0          <1>         and     bx, ~PAGE_OFF ; ~0FFFh ; reset bits, 0 to 11
  2174 0000521D 8A1D[B3030300]      <1> 	mov	bl, [u.uno] ; current process number
  2175 00005223 E814FFFFFF          <1> 	call	swap_queue_shift ; drop from the queue if
  2176                              <1> 				 ; it is already on the queue
  2177                              <1> 		; then add it to the tail of the queue
  2178 00005228 0FB705[60050300]    <1> 	movzx	eax, word [swpq_count]
  2179 0000522F 663D0004            <1> 	cmp	ax, 1024
  2180 00005233 7205                <1> 	jb	short atsq_1
  2181 00005235 6629C0              <1> 	sub	ax, ax
  2182 00005238 5B                  <1> 	pop	ebx
  2183 00005239 C3                  <1> 	retn
  2184                              <1> atsq_1:
  2185 0000523A 56                  <1> 	push	esi
  2186 0000523B BE00E00800          <1> 	mov	esi, swap_queue
  2187 00005240 6621C0              <1> 	and	ax, ax
  2188 00005243 740A                <1> 	jz	short atsq_2
  2189 00005245 66C1E002            <1> 	shl	ax, 2	; convert to offset
  2190 00005249 01C6                <1> 	add	esi, eax
  2191 0000524B 66C1E802            <1> 	shr	ax, 2
  2192                              <1> atsq_2:
  2193 0000524F 6640                <1> 	inc	ax
  2194 00005251 891E                <1> 	mov	[esi], ebx ; Virtual address + [u.uno] combination
  2195 00005253 66A3[60050300]      <1> 	mov	[swpq_count], ax
  2196 00005259 5E                  <1> 	pop	esi
  2197 0000525A 5B                  <1> 	pop	ebx
  2198 0000525B C3                  <1> 	retn
  2199                              <1> 
  2200                              <1> unlink_swap_block:
  2201                              <1> 	; 15/09/2015
  2202                              <1> 	; 30/04/2015
  2203                              <1> 	; 18/04/2015
  2204                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  2205                              <1> 	;
  2206                              <1> 	; INPUT -> 
  2207                              <1> 	;	EAX = swap disk/file offset address
  2208                              <1> 	;	      (bit 1 to bit 31)
  2209                              <1> 	; OUTPUT ->
  2210                              <1> 	;	[swpd_free] is increased
  2211                              <1> 	;	(corresponding SWAP DISK ALLOC. TABLE bit is SET)
  2212                              <1> 	;
  2213                              <1> 	; Modified Registers -> EAX
  2214                              <1> 	;
  2215 0000525C 53                  <1> 	push	ebx
  2216 0000525D 52                  <1> 	push	edx
  2217                              <1> 	;
  2218 0000525E C1E804              <1> 	shr	eax, SECTOR_SHIFT+1  ;3+1 ; shift sector address to 
  2219                              <1> 				     ; 3 bits right
  2220                              <1> 				     ; to get swap block/page number
  2221 00005261 89C2                <1> 	mov	edx, eax
  2222                              <1> 	; 15/09/2015
  2223 00005263 C1EA03              <1> 	shr	edx, 3		     ; to get offset to S.A.T.
  2224                              <1> 				     ; (1 allocation bit = 1 page)
  2225                              <1> 				     ; (1 allocation bytes = 8 pages)
  2226 00005266 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  2227                              <1> 				     ; (to get 32 bit position)			
  2228                              <1> 	;
  2229 00005269 BB00000D00          <1> 	mov	ebx, swap_alloc_table ; Swap Allocation Table address
  2230 0000526E 01D3                <1> 	add	ebx, edx
  2231 00005270 83E01F              <1> 	and	eax, 1Fh	     ; lower 5 bits only
  2232                              <1> 				     ; (allocation bit position)	 
  2233 00005273 3B05[6E050300]      <1> 	cmp 	eax, [swpd_next]     ; is the new free block addr. lower
  2234                              <1> 				     ; than the address in 'swpd_next' ?
  2235                              <1> 				     ; (next/first free block value)		
  2236 00005279 7305                <1> 	jnb	short uswpbl_1	     ; no	
  2237 0000527B A3[6E050300]        <1> 	mov	[swpd_next], eax     ; yes	
  2238                              <1> uswpbl_1:
  2239 00005280 0FAB03              <1> 	bts	[ebx], eax	     ; unlink/release/deallocate block
  2240                              <1> 				     ; set relevant bit to 1.
  2241                              <1> 				     ; set CF to the previous bit value	
  2242 00005283 F5                  <1> 	cmc			     ; complement carry flag	
  2243 00005284 7206                <1> 	jc	short uswpbl_2	     ; do not increase swfd_free count
  2244                              <1> 				     ; if the block is already deallocated
  2245                              <1> 				     ; before.	
  2246 00005286 FF05[6A050300]      <1>         inc     dword [swpd_free]
  2247                              <1> uswpbl_2:
  2248 0000528C 5A                  <1> 	pop	edx
  2249 0000528D 5B                  <1> 	pop	ebx
  2250 0000528E C3                  <1> 	retn
  2251                              <1> 
  2252                              <1> link_swap_block:
  2253                              <1> 	; 01/07/2015
  2254                              <1> 	; 18/04/2015
  2255                              <1> 	; 24/10/2014 (Retro UNIX 386 v1 - beginning)
  2256                              <1> 	;
  2257                              <1> 	; INPUT -> none
  2258                              <1> 	;
  2259                              <1> 	; OUTPUT ->
  2260                              <1> 	;	EAX = OFFSET ADDRESS OF THE ALLOCATED BLOCK (4096 bytes)
  2261                              <1> 	;	      in sectors (corresponding 
  2262                              <1> 	;	      SWAP DISK ALLOCATION TABLE bit is RESET)
  2263                              <1> 	;
  2264                              <1> 	;	CF = 1 and EAX = 0 
  2265                              <1> 	; 		   if there is not a free block to be allocated	
  2266                              <1> 	;
  2267                              <1> 	; Modified Registers -> none (except EAX)
  2268                              <1> 	;
  2269                              <1> 
  2270                              <1> 	;mov	eax, [swpd_free]
  2271                              <1> 	;and	eax, eax
  2272                              <1> 	;jz	short out_of_swpspc
  2273                              <1> 	;
  2274 0000528F 53                  <1> 	push	ebx
  2275 00005290 51                  <1> 	push	ecx
  2276                              <1> 	;
  2277 00005291 BB00000D00          <1> 	mov	ebx, swap_alloc_table ; Swap Allocation Table offset
  2278 00005296 89D9                <1> 	mov	ecx, ebx
  2279 00005298 031D[6E050300]      <1> 	add	ebx, [swpd_next] ; Free block searching starts from here
  2280                              <1> 				 ; next_free_swap_block >> 5
  2281 0000529E 030D[72050300]      <1> 	add	ecx, [swpd_last] ; Free block searching ends here
  2282                              <1> 				 ; (total_swap_blocks - 1) >> 5
  2283                              <1> lswbl_scan:
  2284 000052A4 39CB                <1> 	cmp	ebx, ecx
  2285 000052A6 770A                <1> 	ja	short lswbl_notfound
  2286                              <1> 	;
  2287 000052A8 0FBC03              <1> 	bsf	eax, [ebx] ; Scans source operand for first bit set (1).
  2288                              <1> 			   ; Clears ZF if a bit is found set (1) and 
  2289                              <1> 			   ; loads the destination with an index to
  2290                              <1> 			   ; first set bit. (0 -> 31) 
  2291                              <1> 			   ; Sets ZF to 1 if no bits are found set.
  2292                              <1> 	; 01/07/2015
  2293 000052AB 751C                <1> 	jnz	short lswbl_found ; ZF = 0 -> a free block has been found
  2294                              <1> 			 ;
  2295                              <1> 			 ; NOTE:  a Swap Disk Allocation Table bit 
  2296                              <1> 			 ;	  with value of 1 means 
  2297                              <1> 			 ;	  the corresponding page is free 
  2298                              <1> 			 ;	  (Retro UNIX 386 v1 feaure only!)
  2299 000052AD 83C304              <1> 	add	ebx, 4
  2300                              <1> 			 ; We return back for searching next page block
  2301                              <1> 			 ; NOTE: [swpd_free] is not ZERO; so, 
  2302                              <1> 			 ;	 we always will find at least 1 free block here.
  2303 000052B0 EBF2                <1> 	jmp    	short lswbl_scan
  2304                              <1> 	;
  2305                              <1> lswbl_notfound:	
  2306 000052B2 81E900000D00        <1> 	sub	ecx, swap_alloc_table
  2307 000052B8 890D[6E050300]      <1> 	mov	[swpd_next], ecx ; next/first free page = last page 
  2308                              <1> 				 ; (unlink_swap_block procedure will change it)
  2309 000052BE 31C0                <1> 	xor	eax, eax
  2310 000052C0 A3[6A050300]        <1> 	mov	[swpd_free], eax
  2311 000052C5 F9                  <1> 	stc
  2312                              <1> lswbl_ok:
  2313 000052C6 59                  <1> 	pop	ecx
  2314 000052C7 5B                  <1> 	pop	ebx
  2315 000052C8 C3                  <1> 	retn
  2316                              <1> 	;
  2317                              <1> ;out_of_swpspc:
  2318                              <1> ;	stc
  2319                              <1> ;	retn
  2320                              <1> 
  2321                              <1> lswbl_found:
  2322 000052C9 89D9                <1> 	mov	ecx, ebx
  2323 000052CB 81E900000D00        <1> 	sub	ecx, swap_alloc_table
  2324 000052D1 890D[6E050300]      <1> 	mov	[swpd_next], ecx ; Set first free block searching start
  2325                              <1> 				 ; address/offset (to the next)
  2326 000052D7 FF0D[6A050300]      <1>         dec     dword [swpd_free] ; 1 block has been allocated (X = X-1) 
  2327                              <1> 	;
  2328 000052DD 0FB303              <1> 	btr	[ebx], eax	 ; The destination bit indexed by the source value
  2329                              <1> 				 ; is copied into the Carry Flag and then cleared
  2330                              <1> 				 ; in the destination.
  2331                              <1> 				 ;
  2332                              <1> 				 ; Reset the bit which is corresponding to the 
  2333                              <1> 				 ; (just) allocated block.
  2334 000052E0 C1E105              <1> 	shl	ecx, 5		 ; (block offset * 32) + block index
  2335 000052E3 01C8                <1> 	add	eax, ecx	 ; = block number
  2336 000052E5 C1E003              <1> 	shl	eax, SECTOR_SHIFT ; 3, sector (offset) address of the block
  2337                              <1> 				 ; 1 block =  8 sectors
  2338                              <1> 	;
  2339                              <1> 	; EAX = offset address of swap disk/file sector (beginning of the block)
  2340                              <1> 	;
  2341                              <1> 	; NOTE: The relevant page table entry will be updated
  2342                              <1> 	;       according to this EAX value...
  2343                              <1> 	;
  2344 000052E8 EBDC                <1> 	jmp	short lswbl_ok
  2345                              <1> 
  2346                              <1> logical_disk_read:
  2347                              <1> 	; 20/07/2015
  2348                              <1> 	; 09/03/2015 (temporary code here)
  2349                              <1> 	;
  2350                              <1> 	; INPUT ->
  2351                              <1> 	; 	ESI = Logical disk description table address
  2352                              <1> 	; 	EBX = Memory page (buffer) address (physical!)
  2353                              <1> 	; 	EAX = Sector adress (offset address, logical sector number)
  2354                              <1> 	; 	ECX = Sector count
  2355                              <1> 	;
  2356                              <1> 	;
  2357 000052EA C3                  <1> 	retn
  2358                              <1> 
  2359                              <1> logical_disk_write:
  2360                              <1> 	; 20/07/2015
  2361                              <1> 	; 09/03/2015 (temporary code here)
  2362                              <1> 	;
  2363                              <1> 	; INPUT ->
  2364                              <1> 	; 	ESI = Logical disk description table address
  2365                              <1> 	; 	EBX = Memory page (buffer) address (physical!)
  2366                              <1> 	; 	EAX = Sector adress (offset address, logical sector number)
  2367                              <1> 	; 	ECX = Sector count
  2368                              <1> 	;
  2369 000052EB C3                  <1> 	retn
  2370                              <1> 
  2371                              <1> get_physical_addr:
  2372                              <1> 	; 26/03/2017
  2373                              <1> 	; 20/02/2017
  2374                              <1> 	; 27/05/2016 - TRDOS 386 (TRDOS v2.0)
  2375                              <1> 	; 18/10/2015
  2376                              <1> 	; 29/07/2015
  2377                              <1> 	; 20/07/2015
  2378                              <1> 	; 04/06/2015
  2379                              <1> 	; 20/05/2015
  2380                              <1> 	; 28/04/2015
  2381                              <1> 	; 18/04/2015
  2382                              <1> 	; Get physical address
  2383                              <1> 	;     (allocates a new page for user if it is not present)
  2384                              <1> 	;	
  2385                              <1> 	; (This subroutine is needed for mapping user's virtual 
  2386                              <1> 	; (buffer) address to physical address (of the buffer).)
  2387                              <1> 	; ('sys write', 'sys read' system calls...)
  2388                              <1> 	;
  2389                              <1> 	; INPUT ->
  2390                              <1> 	;	EBX = virtual address
  2391                              <1> 	;	u.pgdir = page directory (physical) address
  2392                              <1> 	;
  2393                              <1> 	; OUTPUT ->
  2394                              <1> 	;	EAX = physical address 
  2395                              <1> 	;	EBX = linear address	
  2396                              <1> 	;	EDX = physical address of the page frame
  2397                              <1> 	;	      (with attribute bits)
  2398                              <1> 	;	ECX = byte count within the page frame
  2399                              <1> 	;
  2400                              <1> 	; Modified Registers -> EAX, EBX, ECX, EDX
  2401                              <1> 	;
  2402 000052EC 81C300004000        <1> 	add	ebx, CORE ; 18/10/2015
  2403                              <1> get_physical_addr_x: ; 27/05/2016
  2404 000052F2 A1[B8030300]        <1> 	mov	eax, [u.pgdir]
  2405 000052F7 E8F6F9FFFF          <1> 	call	get_pte
  2406                              <1> 		; EDX = Page table entry address (if CF=0)
  2407                              <1> 	        ;       Page directory entry address (if CF=1)
  2408                              <1> 		;       (Bit 0 value is 0 if PT is not present)
  2409                              <1> 		; EAX = Page table entry value (page address)
  2410                              <1> 		;	CF = 1 -> PDE not present or invalid ? 
  2411 000052FC 731C                <1> 	jnc	short gpa_1
  2412                              <1> 	;
  2413 000052FE E8D4F8FFFF          <1> 	call	allocate_page
  2414 00005303 7248                <1> 	jc	short gpa_im_err  ; 'insufficient memory' error
  2415                              <1> gpa_0:
  2416 00005305 E847F9FFFF          <1> 	call 	clear_page
  2417                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  2418 0000530A 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER ; 4+2+1 = 7
  2419                              <1> 			   ; lower 3 bits are used as U/S, R/W, P flags
  2420                              <1> 			   ; (user, writable, present page)	
  2421 0000530C 8902                <1> 	mov	[edx], eax ; Let's put the new page directory entry here !
  2422 0000530E A1[B8030300]        <1> 	mov	eax, [u.pgdir]	
  2423 00005313 E8DAF9FFFF          <1> 	call	get_pte
  2424 00005318 7233                <1> 	jc	short gpa_im_err ; 'insufficient memory' error
  2425                              <1> gpa_1:
  2426                              <1> 	; EAX = PTE value, EDX = PTE address
  2427 0000531A A801                <1> 	test 	al, PTE_A_PRESENT
  2428 0000531C 751F                <1> 	jnz	short gpa_3 ; 26/03/2017
  2429 0000531E 09C0                <1> 	or	eax, eax
  2430 00005320 7456                <1> 	jz	short gpa_7  ; Allocate a new page
  2431                              <1> 	; 20/07/2015
  2432 00005322 55                  <1> 	push	ebp
  2433 00005323 89DD                <1> 	mov	ebp, ebx ; virtual (linear) address
  2434                              <1> 	; reload swapped page
  2435 00005325 E878000000          <1> 	call	reload_page ; 28/04/2015
  2436 0000532A 5D                  <1> 	pop	ebp
  2437 0000532B 724A                <1> 	jc	short gpa_retn
  2438                              <1> gpa_2:
  2439                              <1> 	; 26/03/2017
  2440                              <1> 	; 20/02/2017
  2441                              <1> 	; If a page will contain a Signal Response Byte
  2442                              <1> 	; it must not be swapped out, because
  2443                              <1> 	; timer service or irq callback service
  2444                              <1> 	; will write a signal return/response byte 
  2445                              <1> 	; directly by using physical address of Signal
  2446                              <1> 	; Response Byte.(Even if process is not running,
  2447                              <1> 	; or it is running with swapped out pages.)
  2448                              <1> 	;
  2449                              <1> 	; 'no_page_swap' will be set by 'systimer' or
  2450                              <1> 	; 'syscalbac' sistem functions/calls. (*)
  2451                              <1> 	;
  2452 0000532D 803D[926A0100]00    <1> 	cmp	byte [no_page_swap], 0
  2453 00005334 761D                <1> 	jna	short gpa_4 ; this page can be swapped out
  2454                              <1> 	; this page must not be swapped out
  2455                              <1> 	; but 'no_page_swap' must be reset here
  2456                              <1> 	; imediately for other callers (*)
  2457                              <1> 	; (otherwise, swap queue would not be long enough) 
  2458 00005336 E84B000000          <1> 	call	gpa_8 ; 26/03/2017
  2459 0000533B EB1D                <1> 	jmp	short gpa_5
  2460                              <1> gpa_3: 
  2461                              <1> 	; 26/03/2017
  2462 0000533D 803D[926A0100]00    <1> 	cmp	byte [no_page_swap], 0
  2463 00005344 7618                <1> 	jna	short gpa_6 ; this page can be swapped out
  2464 00005346 E83B000000          <1> 	call	gpa_8
  2465 0000534B EB11                <1> 	jmp	short gpa_6
  2466                              <1> 
  2467                              <1> gpa_im_err:	
  2468 0000534D B804000000          <1> 	mov	eax, ERR_MINOR_IM ; Insufficient memory (minor) error!
  2469                              <1> 				  ; Major error = 0 (No protection fault)	
  2470 00005352 C3                  <1> 	retn
  2471                              <1> gpa_4:
  2472                              <1> 	; 20/07/2015
  2473                              <1> 	; 20/05/2015
  2474                              <1> 	; add this page to swap queue
  2475 00005353 50                  <1> 	push	eax 
  2476                              <1> 	; EBX = Linear (CORE+virtual) address ; 20/02/2017 
  2477 00005354 E8BDFEFFFF          <1> 	call 	add_to_swap_queue
  2478 00005359 58                  <1> 	pop	eax
  2479                              <1> gpa_5:
  2480                              <1> 		; PTE address in EDX
  2481                              <1> 		; virtual address in EBX
  2482                              <1> 	; EAX = memory page address
  2483 0000535A 0C07                <1> 	or	al, PTE_A_PRESENT + PTE_A_USER + PTE_A_WRITE
  2484                              <1> 				  ; present flag, bit 0 = 1
  2485                              <1> 				  ; user flag, bit 2 = 1	
  2486                              <1> 				  ; writable flag, bit 1 = 1
  2487 0000535C 8902                <1> 	mov	[edx], eax  ; Update PTE value
  2488                              <1> gpa_6:
  2489                              <1> 	; 18/10/2015
  2490 0000535E 89D9                <1> 	mov	ecx, ebx
  2491 00005360 81E1FF0F0000        <1> 	and	ecx, PAGE_OFF
  2492 00005366 89C2                <1> 	mov 	edx, eax
  2493 00005368 662500F0            <1> 	and	ax, PTE_A_CLEAR
  2494 0000536C 01C8                <1> 	add	eax, ecx
  2495 0000536E F7D9                <1> 	neg	ecx ; 1 -> -1 (0FFFFFFFFh), 4095 (0FFFh) -> -4095
  2496 00005370 81C100100000        <1> 	add	ecx, PAGE_SIZE
  2497 00005376 F8                  <1> 	clc
  2498                              <1> gpa_retn:
  2499 00005377 C3                  <1> 	retn
  2500                              <1> gpa_7:	
  2501 00005378 E85AF8FFFF          <1> 	call	allocate_page
  2502 0000537D 72CE                <1> 	jc	short gpa_im_err ; 'insufficient memory' error
  2503 0000537F E8CDF8FFFF          <1> 	call	clear_page
  2504 00005384 EBA7                <1> 	jmp	short gpa_2
  2505                              <1> 
  2506                              <1> gpa_8: ; 26/03/2017
  2507 00005386 C605[926A0100]00    <1> 	mov	byte [no_page_swap], 0
  2508 0000538D 53                  <1> 	push	ebx
  2509 0000538E 50                  <1> 	push	eax ; 26/03/2017
  2510 0000538F 6681E300F0          <1>         and     bx, ~PAGE_OFF ; ~0FFFh ; reset bits, 0 to 11
  2511 00005394 8A1D[B3030300]      <1> 	mov	bl, [u.uno] ; current process number
  2512 0000539A E89DFDFFFF          <1> 	call	swap_queue_shift ; drop from the queue if
  2513                              <1> 				 ; it is already on the queue
  2514 0000539F 58                  <1> 	pop	eax ; 26/03/2017
  2515 000053A0 5B                  <1> 	pop	ebx
  2516 000053A1 C3                  <1> 	retn
  2517                              <1> 
  2518                              <1> reload_page:
  2519                              <1> 	; 20/07/2015
  2520                              <1> 	; 28/04/2015 (Retro UNIX 386 v1 - beginning)
  2521                              <1> 	;
  2522                              <1> 	; Reload (Restore) swapped page at memory
  2523                              <1> 	;
  2524                              <1> 	; INPUT -> 
  2525                              <1> 	;	EBP = Virtual (linear) memory address
  2526                              <1> 	;	EAX = PTE value (swap disk sector address)
  2527                              <1> 	;	(Swap disk sector address = bit 1 to bit 31 of EAX)	
  2528                              <1> 	; OUTPUT ->
  2529                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS OF RELOADED PAGE
  2530                              <1> 	;
  2531                              <1> 	;	CF = 1 and EAX = error code
  2532                              <1> 	;
  2533                              <1> 	; Modified Registers -> none (except EAX)
  2534                              <1> 	;
  2535 000053A2 D1E8                <1> 	shr	eax, 1   ; Convert PTE value to swap disk address 
  2536 000053A4 53                  <1> 	push	ebx      ;
  2537 000053A5 89C3                <1> 	mov	ebx, eax ; Swap disk (offset) address	
  2538 000053A7 E82BF8FFFF          <1> 	call	allocate_page
  2539 000053AC 720C                <1> 	jc	short rlp_im_err
  2540 000053AE 93                  <1> 	xchg 	eax, ebx	
  2541                              <1> 	; EBX = Physical memory (page) address
  2542                              <1> 	; EAX = Swap disk (offset) address
  2543                              <1> 	; EBP = Virtual (linear) memory address
  2544 000053AF E862FCFFFF          <1> 	call	swap_in
  2545 000053B4 720B                <1> 	jc	short rlp_swp_err  ; (swap disk/file read error)
  2546 000053B6 89D8                <1> 	mov	eax, ebx	
  2547                              <1> rlp_retn:
  2548 000053B8 5B                  <1> 	pop	ebx
  2549 000053B9 C3                  <1> 	retn
  2550                              <1> 	
  2551                              <1> rlp_im_err:	
  2552 000053BA B804000000          <1> 	mov	eax, ERR_MINOR_IM ; Insufficient memory (minor) error!
  2553                              <1> 				  ; Major error = 0 (No protection fault)	
  2554 000053BF EBF7                <1> 	jmp	short rlp_retn
  2555                              <1> 
  2556                              <1> rlp_swp_err:
  2557 000053C1 B828000000          <1> 	mov 	eax, SWP_DISK_READ_ERR ; Swap disk read error !
  2558 000053C6 EBF0                <1> 	jmp	short rlp_retn
  2559                              <1> 
  2560                              <1> 
  2561                              <1> copy_page_dir:
  2562                              <1> 	; 19/09/2015
  2563                              <1> 	; temporary - 07/09/2015
  2564                              <1> 	; 07/09/2015 (Retro UNIX 386 v1 - beginning)
  2565                              <1> 	;
  2566                              <1> 	; INPUT -> 
  2567                              <1> 	;	[u.pgdir] = PHYSICAL (real/flat) ADDRESS of the parent's
  2568                              <1> 	;		    page directory.
  2569                              <1> 	; OUTPUT ->
  2570                              <1> 	;	EAX =  PHYSICAL (real/flat) ADDRESS of the child's
  2571                              <1> 	;	       page directory.
  2572                              <1> 	;	(New page directory with new page table entries.)
  2573                              <1> 	;	(New page tables with read only copies of the parent's
  2574                              <1> 	;	pages.)
  2575                              <1> 	;	EAX = 0 -> Error (CF = 1)
  2576                              <1> 	;
  2577                              <1> 	; Modified Registers -> none (except EAX)
  2578                              <1> 	;
  2579 000053C8 E80AF8FFFF          <1> 	call	allocate_page
  2580 000053CD 723E                <1> 	jc	short cpd_err
  2581                              <1> 	;
  2582 000053CF 55                  <1> 	push	ebp ; 20/07/2015
  2583 000053D0 56                  <1> 	push	esi
  2584 000053D1 57                  <1> 	push	edi
  2585 000053D2 53                  <1> 	push	ebx
  2586 000053D3 51                  <1> 	push	ecx
  2587 000053D4 8B35[B8030300]      <1> 	mov	esi, [u.pgdir]
  2588 000053DA 89C7                <1> 	mov	edi, eax
  2589 000053DC 50                  <1> 	push	eax ; save child's page directory address
  2590                              <1> 	; copy PDE 0 from the parent's page dir to the child's page dir
  2591                              <1> 	; (use same system space for all user page tables) 
  2592 000053DD A5                  <1> 	movsd
  2593 000053DE BD00004000          <1> 	mov	ebp, 1024*4096 ; pass the 1st 4MB (system space)
  2594 000053E3 B9FF030000          <1> 	mov	ecx, (PAGE_SIZE / 4) - 1 ; 1023
  2595                              <1> cpd_0:	
  2596 000053E8 AD                  <1> 	lodsd
  2597                              <1> 	;or	eax, eax
  2598                              <1>         ;jnz     short cpd_1
  2599 000053E9 A801                <1> 	test	al, PDE_A_PRESENT ;  bit 0 =  1
  2600 000053EB 7508                <1> 	jnz	short cpd_1
  2601                              <1>  	; (virtual address at the end of the page table)	
  2602 000053ED 81C500004000        <1> 	add	ebp, 1024*4096 ; page size * PTE count
  2603 000053F3 EB0F                <1> 	jmp	short cpd_2
  2604                              <1> cpd_1:	
  2605 000053F5 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear attribute bits
  2606 000053F9 89C3                <1> 	mov	ebx, eax
  2607                              <1> 	; EBX = Parent's page table address
  2608 000053FB E81F000000          <1> 	call	copy_page_table
  2609 00005400 720C                <1> 	jc	short cpd_p_err
  2610                              <1> 	; EAX = Child's page table address
  2611 00005402 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER
  2612                              <1> 			 ; set bit 0, bit 1 and bit 2 to 1
  2613                              <1> 			 ; (present, writable, user)
  2614                              <1> cpd_2:
  2615 00005404 AB                  <1> 	stosd
  2616 00005405 E2E1                <1> 	loop	cpd_0
  2617                              <1> 	;
  2618 00005407 58                  <1> 	pop	eax  ; restore child's page directory address
  2619                              <1> cpd_3:
  2620 00005408 59                  <1> 	pop	ecx
  2621 00005409 5B                  <1> 	pop	ebx
  2622 0000540A 5F                  <1> 	pop	edi
  2623 0000540B 5E                  <1> 	pop	esi
  2624 0000540C 5D                  <1> 	pop	ebp
  2625                              <1> cpd_err:
  2626 0000540D C3                  <1> 	retn
  2627                              <1> cpd_p_err:
  2628                              <1> 	; release the allocated pages missing (recover free space)
  2629 0000540E 58                  <1> 	pop	eax  ; the new page directory address (physical)
  2630 0000540F 8B1D[B8030300]      <1> 	mov	ebx, [u.pgdir] ; parent's page directory address 
  2631 00005415 E8F6F8FFFF          <1> 	call 	deallocate_page_dir
  2632 0000541A 29C0                <1> 	sub	eax, eax ; 0
  2633 0000541C F9                  <1> 	stc
  2634 0000541D EBE9                <1> 	jmp	short cpd_3	
  2635                              <1> 
  2636                              <1> copy_page_table:
  2637                              <1> 	; 19/09/2015
  2638                              <1> 	; temporary - 07/09/2015
  2639                              <1> 	; 07/09/2015 (Retro UNIX 386 v1 - beginning)
  2640                              <1> 	;
  2641                              <1> 	; INPUT -> 
  2642                              <1> 	;	EBX = PHYSICAL (real/flat) ADDRESS of the parent's page table.
  2643                              <1> 	;	EBP = page table entry index (from 'copy_page_dir')
  2644                              <1> 	; OUTPUT ->
  2645                              <1> 	;	EAX = PHYSICAL (real/flat) ADDRESS of the child's page table.
  2646                              <1> 	;	EBP = (recent) page table index (for 'add_to_swap_queue')	
  2647                              <1> 	;	CF = 1 -> error 
  2648                              <1> 	;
  2649                              <1> 	; Modified Registers -> EBP (except EAX)
  2650                              <1> 	;
  2651 0000541F E8B3F7FFFF          <1> 	call	allocate_page
  2652 00005424 725A                <1> 	jc	short cpt_err
  2653                              <1> 	;
  2654 00005426 50                  <1> 	push	eax ; *
  2655                              <1> 	;push 	ebx
  2656 00005427 56                  <1> 	push	esi
  2657 00005428 57                  <1> 	push	edi
  2658 00005429 52                  <1> 	push	edx
  2659 0000542A 51                  <1> 	push	ecx
  2660                              <1> 	;
  2661 0000542B 89DE                <1> 	mov	esi, ebx
  2662 0000542D 89C7                <1> 	mov	edi, eax
  2663 0000542F 89C2                <1> 	mov	edx, eax
  2664 00005431 81C200100000        <1> 	add	edx, PAGE_SIZE 	
  2665                              <1> cpt_0:
  2666 00005437 AD                  <1> 	lodsd
  2667 00005438 A801                <1> 	test	al, PTE_A_PRESENT ;  bit 0 =  1
  2668 0000543A 750B                <1> 	jnz	short cpt_1
  2669 0000543C 21C0                <1> 	and	eax, eax
  2670 0000543E 7430                <1> 	jz	short cpt_2
  2671                              <1> 	; ebp = virtual (linear) address of the memory page
  2672 00005440 E85DFFFFFF          <1> 	call	reload_page ; 28/04/2015
  2673 00005445 7234                <1> 	jc	short cpt_p_err
  2674                              <1> cpt_1:
  2675 00005447 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; clear attribute bits
  2676 0000544B 89C1                <1> 	mov	ecx, eax
  2677                              <1> 	; Allocate a new page for the child process
  2678 0000544D E885F7FFFF          <1> 	call	allocate_page
  2679 00005452 7227                <1> 	jc	short cpt_p_err
  2680 00005454 57                  <1> 	push	edi
  2681 00005455 56                  <1> 	push	esi
  2682 00005456 89CE                <1> 	mov	esi, ecx
  2683 00005458 89C7                <1> 	mov	edi, eax
  2684 0000545A B900040000          <1> 	mov	ecx, PAGE_SIZE/4
  2685 0000545F F3A5                <1> 	rep	movsd	; copy page (4096 bytes)
  2686 00005461 5E                  <1> 	pop	esi
  2687 00005462 5F                  <1> 	pop	edi
  2688                              <1> 	; 
  2689 00005463 53                  <1> 	push	ebx
  2690 00005464 50                  <1> 	push	eax
  2691 00005465 89EB                <1> 	mov	ebx, ebp
  2692                              <1> 	; ebx = virtual address of the memory page
  2693 00005467 E8AAFDFFFF          <1> 	call	add_to_swap_queue
  2694 0000546C 58                  <1> 	pop	eax
  2695 0000546D 5B                  <1> 	pop	ebx
  2696                              <1> 	;
  2697                              <1> 	;or	ax, PTE_A_USER+PTE_A_PRESENT 
  2698 0000546E 0C07                <1> 	or	al, PTE_A_USER+PTE_A_WRITE+PTE_A_PRESENT 
  2699                              <1> cpt_2:
  2700 00005470 AB                  <1> 	stosd  ; EDI points to child's PTE  	 
  2701                              <1> 	;
  2702 00005471 81C500100000        <1> 	add	ebp, 4096 ; 20/07/2015 (next page)
  2703                              <1> 	;
  2704 00005477 39D7                <1> 	cmp	edi, edx
  2705 00005479 72BC                <1> 	jb	short cpt_0
  2706                              <1> cpt_p_err:
  2707 0000547B 59                  <1> 	pop	ecx
  2708 0000547C 5A                  <1> 	pop	edx
  2709 0000547D 5F                  <1> 	pop	edi
  2710 0000547E 5E                  <1> 	pop	esi
  2711                              <1> 	;pop	ebx
  2712 0000547F 58                  <1> 	pop	eax ; *
  2713                              <1> cpt_err:
  2714 00005480 C3                  <1> 	retn
  2715                              <1> 
  2716                              <1> allocate_memory_block:
  2717                              <1> 	; 01/05/2017
  2718                              <1> 	; 28/04/2017
  2719                              <1> 	; 25/04/2017
  2720                              <1> 	; 01/04/2016, 02/04/2016, 03/04/2016
  2721                              <1> 	; 13/03/2016, 14/03/2016
  2722                              <1> 	; 12/03/2016 (TRDOS 386 = TRDOS v2.0)
  2723                              <1> 	; Allocating contiguous memory pages (in the kernel's memory space)
  2724                              <1> 	;
  2725                              <1> 	; INPUT -> 
  2726                              <1> 	;	EAX = Beginning address (physical)
  2727                              <1> 	;	EAX = 0 -> Allocate memory block from the first proper aperture	
  2728                              <1> 	;	ECX = Number of bytes to be allocated
  2729                              <1> 	;
  2730                              <1> 	; OUTPUT ->
  2731                              <1> 	; 	1) cf = 0 -> successful
  2732                              <1> 	;	EAX = Beginning (physical) address of the allocated memory block
  2733                              <1> 	;	ECX = Number of allocated bytes (rounded up to page borders) 
  2734                              <1> 	;	2) cf = 1 -> unsuccessful
  2735                              <1> 	;	 2.1) If EAX > 0 -> 
  2736                              <1> 	;	      (Number of requested pages is more than # of free pages
  2737                              <1> 	;	       but contiguous free pages -the aperture- is not enough!)	   	
  2738                              <1> 	;	      EAX = Beginning address of available aperture
  2739                              <1> 	;		    (one of all aperture with max. aperture size/length)		
  2740                              <1> 	;	      ECX = Size of available aperture (memory block) in bytes
  2741                              <1> 	;	 2.2) If EAX = 0 -> Out of memory error 
  2742                              <1> 	;	            (number of free pages is less than requested number)
  2743                              <1> 	;	      ECX = Total number of free bytes (free pages * 4096) 
  2744                              <1> 	;		    (It is not number of contiguous free bytes)	
  2745                              <1> 	;
  2746                              <1> 	; (Modified Registers -> EAX, ECX)
  2747                              <1> 	;
  2748                              <1> 	; PURPOSE: Loading a file at memory for copying or running etc.
  2749                              <1> 	; If this procedure returns with cf is set, ECX contains maximum
  2750                              <1> 	; available space and EAX contains the beginning address of it.
  2751                              <1> 	; If EAX has zero, ECX contains total number of free bytes.
  2752                              <1> 	; If requested block has been successfully allocated (by rounding up to
  2753                              <1> 	; the last page border), it must be deallocated later by using
  2754                              <1> 	; 'deallocate_memory_block' procedure.    
  2755                              <1> 
  2756 00005481 52                  <1> 	push	edx ; *
  2757 00005482 BAFF0F0000          <1> 	mov	edx, PAGE_SIZE - 1   ; 4095
  2758 00005487 01D0                <1> 	add	eax, edx
  2759 00005489 01D1                <1> 	add	ecx, edx
  2760 0000548B C1E90C              <1> 	shr	ecx, PAGE_SHIFT	     ; 12
  2761                              <1> 
  2762                              <1> 	; ECX = number of contiguous pages to be allocated
  2763 0000548E 8B15[C8580100]      <1> 	mov	edx, [free_pages]
  2764                              <1> 	; 01/05/2017
  2765                              <1> 	;or	ecx, ecx
  2766                              <1> 	;jz	short amb3
  2767                              <1> 	; If ECX=0, set cf to 1 and return with max. available mem block size
  2768                              <1> 
  2769 00005494 39D1                <1> 	cmp	ecx, edx
  2770 00005496 7760                <1> 	ja	short amb_3
  2771                              <1> 
  2772 00005498 C1E80C              <1> 	shr	eax, PAGE_SHIFT      ; 12
  2773                              <1> 
  2774 0000549B 89C2                <1> 	mov	edx, eax 	     ; page number
  2775 0000549D C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
  2776                              <1> 				     ; (1 allocation bit = 1 page)
  2777                              <1> 				     ; (1 allocation bytes = 8 pages)
  2778 000054A0 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  2779                              <1> 				     ; (to get 32 bit position)	
  2780 000054A3 53                  <1> 	push	ebx ; **
  2781                              <1> amb_0:
  2782 000054A4 890D[7C640100]      <1> 	mov	[mem_ipg_count], ecx ; initial (reset) value of page count
  2783 000054AA 890D[80640100]      <1> 	mov	[mem_pg_count], ecx
  2784 000054B0 31C9                <1> 	xor	ecx, ecx ; 0
  2785 000054B2 890D[84640100]      <1> 	mov	[mem_aperture], ecx ; 0
  2786 000054B8 890D[88640100]      <1> 	mov	[mem_max_aperture], ecx ; 0
  2787                              <1> 	
  2788 000054BE BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL   ; Memory Allocation Table address.
  2789 000054C3 3B15[CC580100]      <1> 	cmp	edx, [next_page]     ; Is the beginning page address lower
  2790                              <1> 				     ; than the address in 'next_page' ?
  2791                              <1> 				     ; (the first/next free page of user space)		
  2792 000054C9 7208                <1> 	jb	short amb_1
  2793 000054CB 3B15[D0580100]      <1> 	cmp 	edx, [last_page]     ; is the beginning page address higher
  2794                              <1> 				     ; than the address in 'last_page' ?
  2795                              <1> 				     ; (end of the memory)		
  2796 000054D1 7606                <1> 	jna	short amb_2	     ; no	
  2797                              <1> amb_1:
  2798 000054D3 8B15[CC580100]      <1> 	mov	edx, [next_page]     ; M.A.T. offset (1 M.A.T. byte = 8 pages)
  2799                              <1> amb_2:
  2800 000054D9 01D3                <1> 	add	ebx, edx
  2801                              <1> 
  2802                              <1> 	; 28/04/2017
  2803                              <1> 	;xor	ecx, ecx
  2804 000054DB 0FBC0B              <1> 	bsf	ecx, [ebx]	     ; 0 to 31
  2805 000054DE 89D0                <1> 	mov	eax, edx
  2806 000054E0 C1E003              <1> 	shl	eax, 3		     ; *8	
  2807 000054E3 01C8                <1> 	add	eax, ecx	     ; beginning page number
  2808                              <1> 
  2809 000054E5 A3[8C640100]        <1> 	mov	[mem_pg_pos], eax    ; beginning page no (for curr. mem. aperture)
  2810 000054EA A3[90640100]        <1>  	mov	[mem_max_pg_pos], eax ; beginning page no for max. mem. aperture
  2811                              <1> 
  2812 000054EF 83E01F              <1> 	and	eax, 1Fh	     ; lower 5 bits only (0 to 31)
  2813                              <1> 				     ; (allocation bit position)	 
  2814 000054F2 750E                <1> 	jnz	short amb_4	     ; 0
  2815 000054F4 B120                <1> 	mov	cl, 32
  2816 000054F6 EB4B                <1> 	jmp	short amb_10
  2817                              <1> 
  2818                              <1> amb_3:	; out_of_memory
  2819 000054F8 31C0                <1> 	xor	eax, eax ; 0
  2820 000054FA 89D1                <1> 	mov	ecx, edx ; free pages
  2821 000054FC C1E10C              <1> 	shl	ecx, PAGE_SHIFT
  2822 000054FF 5A                  <1> 	pop	edx ; *
  2823 00005500 F9                  <1> 	stc
  2824 00005501 C3                  <1> 	retn	
  2825                              <1> amb_4:
  2826 00005502 8B13                <1> 	mov	edx, [ebx]
  2827 00005504 88C1                <1> 	mov	cl, al ; 1 to 31
  2828 00005506 D3EA                <1> 	shr	edx, cl
  2829 00005508 89D0                <1> 	mov	eax, edx
  2830                              <1> amb_5:
  2831 0000550A D1E8                <1> 	shr	eax, 1 ; (***)
  2832 0000550C 7317                <1> 	jnc	short amb_7
  2833 0000550E FF05[84640100]      <1> 	inc	dword [mem_aperture]
  2834 00005514 FF0D[80640100]      <1> 	dec	dword [mem_pg_count]
  2835 0000551A 7470                <1> 	jz	short amb_15
  2836                              <1> amb_6:
  2837                              <1> 	; 28/04/2017
  2838 0000551C FEC1                <1> 	inc	cl
  2839 0000551E 80F920              <1> 	cmp	cl, 32
  2840 00005521 730D                <1> 	jnb	short amb_9
  2841 00005523 EBE5                <1> 	jmp	short amb_5
  2842                              <1> amb_7:
  2843 00005525 50                  <1> 	push	eax ; (***) allocation bits (in shifted status)
  2844 00005526 E81B010000          <1> 	call	amb_26 ; set maximum memory aperture (free memory block size)
  2845 0000552B 58                  <1> 	pop	eax ; (***)
  2846 0000552C EBEE                <1> 	jmp	short amb_6
  2847                              <1> amb_8:
  2848                              <1> 	; 28/04/2017
  2849 0000552E B120                <1> 	mov	cl, 32
  2850                              <1> amb_9:
  2851 00005530 89DA                <1> 	mov	edx, ebx
  2852 00005532 81EA00001000        <1> 	sub	edx, MEM_ALLOC_TBL
  2853 00005538 3B15[D0580100]      <1> 	cmp	edx, [last_page]
  2854 0000553E 7336                <1> 	jnb	short amb_14 ; contiguous pages not enough
  2855 00005540 83C304              <1> 	add	ebx, 4
  2856                              <1> amb_10:
  2857 00005543 8B03                <1> 	mov	eax, [ebx]
  2858 00005545 21C0                <1> 	and 	eax, eax
  2859 00005547 7408                <1>         jz      short amb_11 ; there is not a free page bit in this alloc dword
  2860 00005549 40                  <1> 	inc	eax ; 0FFFFFFFFh -> 0
  2861 0000554A 740C                <1> 	jz	short amb_12 ; all of bits are set (32 free pages)
  2862 0000554C 48                  <1> 	dec	eax
  2863 0000554D 28C9                <1> 	sub	cl, cl ; 0
  2864 0000554F EBB9                <1> 	jmp	short amb_5
  2865                              <1> amb_11:
  2866 00005551 E8F0000000          <1> 	call	amb_26 ; set maximum memory aperture (free memory block size)
  2867 00005556 EBD8                <1> 	jmp	short amb_9	
  2868                              <1> amb_12:
  2869 00005558 390D[80640100]      <1> 	cmp	[mem_pg_count], ecx ; 32
  2870 0000555E 7306                <1> 	jnb	short amb_13
  2871 00005560 8B0D[80640100]      <1> 	mov	ecx, [mem_pg_count]
  2872                              <1> amb_13:
  2873 00005566 010D[84640100]      <1> 	add	[mem_aperture], ecx
  2874 0000556C 290D[80640100]      <1> 	sub	[mem_pg_count], ecx
  2875 00005572 7618                <1> 	jna	short amb_15
  2876 00005574 EBBA                <1> 	jmp	short amb_9 ; 01/05/2017
  2877                              <1> amb_14:
  2878 00005576 E8CB000000          <1> 	call	amb_26 ; 28/04/2017
  2879 0000557B A1[90640100]        <1> 	mov	eax, [mem_max_pg_pos] ; begin address of max. mem aperture	
  2880 00005580 8B0D[88640100]      <1> 	mov	ecx, [mem_max_aperture] ; max. (largest) memory aperture
  2881 00005586 F9                  <1> 	stc
  2882 00005587 E9AF000000          <1>         jmp     amb_25
  2883                              <1> 
  2884                              <1> amb_15: ; OK !
  2885 0000558C A1[8C640100]        <1> 	mov	eax, [mem_pg_pos]    ; Beginning address as page number
  2886 00005591 8B0D[84640100]      <1> 	mov	ecx, [mem_aperture]  ; Free contiguous page count (>=1)
  2887                              <1> amb_16:
  2888                              <1> 	; allocate contiguous memory pages (via memory allocation table bits)
  2889 00005597 89C2                <1> 	mov	edx, eax
  2890                              <1> 	; 25/04/2017
  2891 00005599 C1EA03              <1> 	shr	edx, 3		 ; 8 pages in one allocation byte
  2892 0000559C 80E2FC              <1> 	and	dl, 0FCh	 ; clear lower 2 bits
  2893                              <1> 				 ; (for dword/32bit positioning)	
  2894                              <1> 
  2895 0000559F BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL
  2896 000055A4 01D3                <1> 	add	ebx, edx
  2897 000055A6 83E01F              <1> 	and	eax, 1Fh ; 31
  2898                              <1> 	; 03/04/2016
  2899 000055A9 BA20000000          <1> 	mov	edx, 32
  2900 000055AE 28C2                <1> 	sub	dl, al
  2901 000055B0 39CA                <1> 	cmp	edx, ecx	 ; ecx >= 1
  2902 000055B2 7602                <1> 	jna	short amb_17
  2903 000055B4 89CA                <1> 	mov	edx, ecx
  2904                              <1> amb_17:
  2905 000055B6 29D1                <1> 	sub	ecx, edx
  2906 000055B8 51                  <1> 	push	ecx ; ***
  2907 000055B9 89D1                <1> 	mov	ecx, edx
  2908                              <1> amb_18:		
  2909 000055BB 0FB303              <1> 	btr	[ebx], eax	 ; The destination bit indexed by the source value
  2910                              <1> 				 ; is copied into the Carry Flag and then cleared
  2911                              <1> 				 ; in the destination.
  2912 000055BE FF0D[C8580100]      <1> 	dec     dword [free_pages] ; 1 page has been allocated (X = X-1) 
  2913 000055C4 49                  <1> 	dec	ecx
  2914 000055C5 7404                <1> 	jz	short amb_19
  2915 000055C7 FEC0                <1> 	inc	al
  2916 000055C9 EBF0                <1> 	jmp	short amb_18
  2917                              <1> amb_19:	
  2918 000055CB 59                  <1> 	pop	ecx ; ***
  2919 000055CC 21C9                <1> 	and	ecx, ecx ; 0 ?
  2920 000055CE 741E                <1> 	jz	short amb_22	
  2921                              <1> 	; 01/04/2016
  2922 000055D0 B020                <1> 	mov	al, 32
  2923                              <1> amb_20:
  2924 000055D2 83C304              <1> 	add	ebx, 4
  2925 000055D5 39C1                <1> 	cmp	ecx, eax ; 32
  2926 000055D7 7305                <1> 	jnb	short amb_21
  2927                              <1> 	; ECX < 32
  2928 000055D9 28C0                <1> 	sub	al, al ; 0
  2929 000055DB 50                  <1> 	push	eax ; 0 ***
  2930 000055DC EBDD                <1> 	jmp	short amb_18
  2931                              <1> amb_21:
  2932 000055DE 2905[C8580100]      <1> 	sub	[free_pages], eax   ; [free_pages] = [free_pages] - 32
  2933 000055E4 C70300000000        <1> 	mov	dword [ebx], 0	    ; reset 32 bits
  2934 000055EA 29C1                <1> 	sub	ecx, eax ; 32
  2935 000055EC 75E4                <1> 	jnz	short amb_20
  2936                              <1> amb_22:
  2937 000055EE A1[8C640100]        <1> 	mov	eax, [mem_pg_pos]   ; Beginning address as page number
  2938 000055F3 8B0D[84640100]      <1> 	mov	ecx, [mem_aperture] ; Free contiguous page count
  2939                              <1> 	; [next_page] update
  2940 000055F9 89C2                <1> 	mov	edx, eax
  2941                              <1> 	; 03/04/2016
  2942 000055FB C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
  2943                              <1> 				     ; (1 allocation bit = 1 page)
  2944                              <1> 				     ; (1 allocation bytes = 8 pages)
  2945 000055FE 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  2946                              <1> 				     ; (to get 32 bit position)	
  2947 00005601 3B15[CC580100]      <1> 	cmp	edx, [next_page] ; first free page pointer offset
  2948 00005607 7732                <1> 	ja	short amb_25
  2949 00005609 BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL
  2950 0000560E 833C1300            <1> 	cmp	dword [ebx+edx], 0
  2951 00005612 7721                <1> 	ja	short amb_24
  2952 00005614 89C2                <1> 	mov	edx, eax
  2953 00005616 01CA                <1> 	add	edx, ecx
  2954 00005618 C1EA03              <1> 	shr	edx, 3
  2955 0000561B 80E2FC              <1> 	and	dl, 0FCh
  2956                              <1> amb_23:
  2957 0000561E 833C1300            <1> 	cmp	dword [ebx+edx], 0
  2958 00005622 7711                <1> 	ja	short amb_24
  2959 00005624 83C204              <1> 	add	edx, 4
  2960 00005627 3B15[D0580100]      <1> 	cmp	edx, [last_page]    ; last page pointer offset
  2961 0000562D 76EF                <1> 	jna	short amb_23
  2962 0000562F 8B15[D4580100]      <1> 	mov	edx, [first_page]   ; (for) beginning of user's space
  2963                              <1> amb_24:
  2964 00005635 8915[CC580100]      <1> 	mov	[next_page], edx
  2965                              <1> amb_25:
  2966 0000563B 9C                  <1> 	pushf
  2967 0000563C C1E00C              <1> 	shl	eax, PAGE_SHIFT	     ; convert to phy. address in bytes
  2968 0000563F C1E10C              <1> 	shl	ecx, PAGE_SHIFT	     ; convert to byte counts
  2969 00005642 9D                  <1> 	popf
  2970 00005643 5B                  <1> 	pop	ebx ; **
  2971 00005644 5A                  <1> 	pop	edx ; *
  2972 00005645 C3                  <1> 	retn
  2973                              <1> 
  2974                              <1> amb_26:	; set maximum free memory aperture (free memory block size) 
  2975 00005646 89DA                <1> 	mov	edx, ebx ; current address
  2976 00005648 81EA00001000        <1> 	sub	edx, MEM_ALLOC_TBL ; MAT beginning address
  2977                              <1> 	; 02/04/2016 
  2978 0000564E C1E203              <1> 	shl	edx, 3 ; MAT byte offset * 8 = page number base
  2979 00005651 01CA                <1> 	add	edx, ecx ; current page number (ecx = 0 to 32)
  2980                              <1> 	;
  2981 00005653 A1[84640100]        <1> 	mov	eax, [mem_aperture]
  2982 00005658 21C0                <1> 	and	eax, eax
  2983 0000565A 7421                <1>         jz      short amb_27
  2984 0000565C C705[84640100]0000- <1>         mov     dword [mem_aperture], 0
  2984 00005664 0000                <1>
  2985 00005666 3B05[88640100]      <1> 	cmp	eax, [mem_max_aperture]
  2986 0000566C 760F                <1> 	jna	short amb_27
  2987 0000566E A3[88640100]        <1> 	mov	[mem_max_aperture], eax
  2988                              <1> 	; 25/04/2017
  2989 00005673 A1[8C640100]        <1> 	mov	eax, [mem_pg_pos]
  2990                              <1> 	; EAX = Beginning page number of the max. aperture 
  2991 00005678 A3[90640100]        <1> 	mov	[mem_max_pg_pos], eax
  2992                              <1> amb_27: 
  2993 0000567D 8915[8C640100]      <1> 	mov	[mem_pg_pos], edx ; current page
  2994                              <1> 
  2995 00005683 A1[7C640100]        <1> 	mov	eax, [mem_ipg_count] ; initial (reset) value of page count
  2996 00005688 A3[80640100]        <1> 	mov	[mem_pg_count], eax
  2997                              <1> 
  2998 0000568D C3                  <1> 	retn
  2999                              <1> 
  3000                              <1> deallocate_memory_block:
  3001                              <1> 	; 03/04/2016
  3002                              <1> 	; 14/03/2016 (TRDOS 386 = TRDOS v2.0)
  3003                              <1> 	; Deallocating contiguous memory pages (in the kernel's memory space)
  3004                              <1> 	;
  3005                              <1> 	; INPUT -> 
  3006                              <1> 	;	EAX = Beginning address (physical)
  3007                              <1> 	;	ECX = Number of bytes to be deallocated
  3008                              <1> 	;
  3009                              <1> 	; OUTPUT ->
  3010                              <1> 	;	Memory Allocation Table bits will be updated
  3011                              <1> 	;	[free_pages] will be changed (increased)
  3012                              <1> 	;
  3013                              <1> 	; (Modified Registers -> EAX, ECX)
  3014                              <1> 	;
  3015                              <1> 	; PURPOSE: Unloading/Freeing a file -or an allocated memory block- 
  3016                              <1> 	; at memory after copying, running, saving, reading, writing etc.
  3017                              <1> 	;
  3018                              <1> 
  3019 0000568E 52                  <1> 	push	edx ; *
  3020 0000568F 53                  <1> 	push	ebx ; **
  3021                              <1> 
  3022 00005690 C1E80C              <1> 	shr	eax, PAGE_SHIFT	     ; 12
  3023 00005693 C1E90C              <1> 	shr	ecx, PAGE_SHIFT	     ; 12
  3024                              <1> 
  3025                              <1> 	; EAX = Beginning page number
  3026                              <1> 	; ECX = Number of contiguous pages to be deallocated
  3027                              <1> damb_0:
  3028                              <1> 	; deallocate contiguous memory pages (via memory allocation table bits)
  3029 00005696 89C2                <1> 	mov	edx, eax
  3030 00005698 C1EA03              <1> 	shr	edx, 3		     ; to get offset to M.A.T.
  3031                              <1> 				     ; (1 allocation bit = 1 page)
  3032                              <1> 				     ; (1 allocation bytes = 8 pages)
  3033 0000569B 80E2FC              <1> 	and	dl, 0FCh 	     ; clear lower 2 bits
  3034                              <1> 				     ; (to get 32 bit position)	
  3035 0000569E 3B15[CC580100]      <1> 	cmp	edx, [next_page] ; next free page
  3036 000056A4 7306                <1> 	jnb	short damb_1
  3037 000056A6 8915[CC580100]      <1> 	mov	[next_page], edx
  3038                              <1> damb_1:
  3039 000056AC BB00001000          <1> 	mov	ebx, MEM_ALLOC_TBL
  3040 000056B1 01D3                <1> 	add	ebx, edx
  3041 000056B3 83E01F              <1> 	and	eax, 1Fh ; 31
  3042                              <1> 
  3043                              <1> 	; 03/04/2016
  3044 000056B6 BA20000000          <1> 	mov	edx, 32
  3045 000056BB 28C2                <1> 	sub	dl, al
  3046 000056BD 39CA                <1> 	cmp	edx, ecx
  3047 000056BF 7602                <1> 	jna	short damb_2
  3048 000056C1 89CA                <1> 	mov	edx, ecx
  3049                              <1> damb_2:
  3050 000056C3 29D1                <1> 	sub	ecx, edx
  3051 000056C5 51                  <1> 	push	ecx ; ***
  3052 000056C6 89D1                <1> 	mov	ecx, edx
  3053                              <1> damb_3:		
  3054 000056C8 0FAB03              <1> 	bts	[ebx], eax	     ; unlink/release/deallocate page
  3055                              <1> 				     ; set relevant bit to 1.
  3056                              <1> 				     ; set CF to the previous bit value	
  3057 000056CB FF05[C8580100]      <1> 	inc     dword [free_pages]   ; 1 page has been deallocated (X = X+1) 
  3058 000056D1 49                  <1> 	dec	ecx
  3059 000056D2 7404                <1> 	jz	short damb_4
  3060 000056D4 FEC0                <1> 	inc	al
  3061 000056D6 EBF0                <1> 	jmp	short damb_3
  3062                              <1> damb_4:	
  3063 000056D8 59                  <1> 	pop	ecx ; ***
  3064 000056D9 21C9                <1> 	and	ecx, ecx ; 0 ?
  3065 000056DB 741E                <1> 	jz	short damb_7
  3066                              <1> 	; 03/04/2016
  3067 000056DD B020                <1> 	mov	al, 32
  3068                              <1> damb_5:
  3069 000056DF 83C304              <1> 	add	ebx, 4
  3070 000056E2 39C1                <1> 	cmp	ecx, eax ; 32
  3071 000056E4 7305                <1> 	jnb	short damb_6
  3072                              <1> 	; ECX < 32
  3073 000056E6 28C0                <1> 	sub	al, al ; 0
  3074 000056E8 50                  <1> 	push	eax ; 0 ***
  3075 000056E9 EBDD                <1> 	jmp	short damb_3
  3076                              <1> damb_6:
  3077 000056EB 0105[C8580100]      <1> 	add	[free_pages], eax ; [free_pages] = [free_pages] + 32
  3078 000056F1 C703FFFFFFFF        <1> 	mov	dword [ebx], 0FFFFFFFFh ; set 32 bits
  3079 000056F7 29C1                <1> 	sub	ecx, eax ; 32
  3080 000056F9 75E4                <1> 	jnz	short damb_5
  3081                              <1> damb_7:
  3082 000056FB 5B                  <1> 	pop	ebx ; **
  3083 000056FC 5A                  <1> 	pop	edx ; *
  3084 000056FD C3                  <1> 	retn
  3085                              <1> 
  3086                              <1> direct_memory_access:
  3087                              <1> 	; 22/07/2017
  3088                              <1> 	; 12/05/2017
  3089                              <1> 	; 16/07/2016
  3090                              <1> 	; 12/07/2016 (TRDOS 386 = TRDOS v2.0)
  3091                              <1> 	; This processure will be called to map
  3092                              <1> 	; user's (ring 3) page tables to access phsical
  3093                              <1> 	; (flat/linear) memory addresses, directly (without
  3094                              <1> 	;  kernel's data transfer functions).
  3095                              <1> 	; 
  3096                              <1> 	; Purpose: Video memory access and shared memory access.
  3097                              <1> 	;
  3098                              <1> 	; INPUT -> 
  3099                              <1> 	;	EAX = Beginning address (physical).
  3100                              <1> 	;	EBX = User's buffer address ; 12/05/2017
  3101                              <1> 	;	ECX = Number of contiguous pages to be mapped.
  3102                              <1> 	; OUTPUT ->
  3103                              <1> 	;	User's page directory and pages tables
  3104                              <1> 	;	will be updated.
  3105                              <1> 	;	
  3106                              <1> 	;	If an old page table entry has valid page address, 
  3107                              <1> 	;	that page will be deallocated just before PTE will
  3108                              <1> 	;	be changed for direct (1 to 1) memory page access.
  3109                              <1> 	;
  3110                              <1> 	;	If old PTE value points to a swapped page,
  3111                              <1>         ;       that page (block) will be unlinked on swap disk. 
  3112                              <1> 	;
  3113                              <1> 	;	Newly allocated pages (except page tables) will not
  3114                              <1> 	;	be applied to Memory Allocation Table.
  3115                              <1> 	;	AVL bit 1 (PTE bit 10) of page table entry will be
  3116                              <1> 	;	used to indicate shared (direct) memory page; then,
  3117                              <1> 	;	this page will not be deallocated later during
  3118                              <1> 	;	process termination. (Memory Allocation Table and
  3119                              <1> 	;	free memory count will not be affected.
  3120                              <1> 	;	(Except deallocating page table's itself.)
  3121                              <1> 	;	
  3122                              <1> 	;      CF = 1 -> error (EAX = error code)
  3123                              <1> 	;      CF = 0 -> success (EAX = beginning address)
  3124                              <1> 	;
  3125                              <1> 	;; (Modified Registers -> none)
  3126                              <1> 	; Modified registers: ebp, edx, ecx, ebx, esi, edi	
  3127                              <1> 	;
  3128                              <1> 
  3129                              <1> 	;push	ebp
  3130                              <1> 	;push	ebx
  3131                              <1> 	;push	ecx
  3132                              <1> 	;push	edx
  3133 000056FE 662500F0            <1> 	and	ax, PTE_A_CLEAR ; clear page offset
  3134 00005702 50                  <1> 	push	eax
  3135                              <1> 	;and	ecx, ecx ; page count
  3136                              <1> 	;jz	dmem_acc_7  ; 'insufficient memory' error
  3137 00005703 89C5                <1> 	mov	ebp, eax
  3138 00005705 81C300004000        <1> 	add	ebx, CORE ; 12/05/2017
  3139                              <1> dmem_acc_0: 
  3140 0000570B 891D[7C6F0100]      <1> 	mov	[base_addr], ebx ; 12/05/2017
  3141 00005711 A1[B8030300]        <1> 	mov	eax, [u.pgdir] ; page dir address (physical)
  3142 00005716 E8D7F5FFFF          <1> 	call	get_pte
  3143                              <1> 		; EDX = Page table entry address (if CF=0)
  3144                              <1> 	        ;       Page directory entry address (if CF=1)
  3145                              <1> 		;       (Bit 0 value is 0 if PT is not present)
  3146                              <1> 		; EAX = Page table entry value (page address)
  3147                              <1> 		;	CF = 1 -> PDE not present or invalid ? 	
  3148 0000571B 7324                <1> 	jnc	short dmem_acc_1
  3149                              <1> 	;
  3150 0000571D E8B5F4FFFF          <1> 	call	allocate_page
  3151 00005722 0F82AB000000        <1>         jc      dmem_acc_7  ; 'insufficient memory' error
  3152                              <1> 	;
  3153 00005728 E824F5FFFF          <1> 	call 	clear_page
  3154                              <1> 	; EAX = Physical (base) address of the allocated (new) page
  3155 0000572D 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER ; 4+2+1 = 7
  3156                              <1> 			   ; lower 3 bits are used as U/S, R/W, P flags
  3157                              <1> 			   ; (user, writable, present page)	
  3158 0000572F 8902                <1> 	mov	[edx], eax ; Let's put the new page directory entry here !
  3159 00005731 A1[B8030300]        <1> 	mov	eax, [u.pgdir]	
  3160 00005736 E8B7F5FFFF          <1> 	call	get_pte
  3161 0000573B 0F8292000000        <1>         jc      dmem_acc_7 ; 'insufficient memory' error
  3162                              <1> dmem_acc_1:
  3163                              <1> 	; EAX = PTE value, EDX = PTE address
  3164 00005741 A801                <1> 	test 	al, PTE_A_PRESENT
  3165 00005743 750D                <1> 	jnz	short dmem_acc_2
  3166 00005745 09C0                <1> 	or	eax, eax
  3167 00005747 7468                <1> 	jz	short dmem_acc_6   ; Change PTE
  3168 00005749 D1E8                <1> 	shr	eax, 1		; swap disk block (8 sectors) address
  3169                              <1> 	; unlink swap disk block
  3170 0000574B E80CFBFFFF          <1> 	call	unlink_swap_block
  3171 00005750 EB5F                <1> 	jmp	short dmem_acc_6
  3172                              <1> 
  3173                              <1> dmem_acc_2:
  3174 00005752 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
  3175                              <1> 				  ; (must be 1)
  3176 00005754 7550                <1> 	jnz	short dmem_acc_4
  3177                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
  3178 00005756 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
  3179                              <1> 				   ; as child's page ?
  3180 0000575A 7455                <1> 	jz	short dmem_acc_5 ; Change PTE but don't deallocate the page!
  3181                              <1> 
  3182                              <1> 	;push	edi
  3183                              <1> 	;push	esi
  3184                              <1> 
  3185 0000575C 51                  <1> 	push	ecx
  3186                              <1> 	;push	ebx
  3187 0000575D 8B1D[BC030300]      <1> 	mov	ebx, [u.ppgdir] ; parent's page dir address (physical)
  3188                              <1> 	
  3189                              <1> 	; check the parent's PTE value is read only & same page or not.. 
  3190 00005763 89EF                <1> 	mov	edi, ebp
  3191 00005765 C1EF16              <1> 	shr	edi, PAGE_D_SHIFT ; 22
  3192                              <1> 	; EDI = page directory entry index (0-1023)
  3193 00005768 89EE                <1> 	mov	esi, ebp
  3194 0000576A C1EE0C              <1> 	shr	esi, PAGE_SHIFT ; 12	
  3195 0000576D 81E6FF030000        <1> 	and	esi, PTE_MASK
  3196                              <1> 	; ESI = page table entry index (0-1023)
  3197                              <1> 
  3198 00005773 66C1E702            <1> 	shl	di, 2 ; * 4
  3199 00005777 01FB                <1> 	add	ebx, edi ; PDE offset (for the parent)
  3200 00005779 8B0F                <1> 	mov	ecx, [edi]
  3201 0000577B F6C101              <1> 	test	cl, PDE_A_PRESENT ; present (valid) or not ?
  3202 0000577E 7425                <1> 	jz	short dmem_acc_3	; parent process does not use this page
  3203 00005780 6681E100F0          <1> 	and	cx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  3204 00005785 66C1E602            <1> 	shl	si, 2 ; *4 
  3205 00005789 01CE                <1> 	add	esi, ecx ; PTE offset (for the parent)
  3206 0000578B 8B1E                <1> 	mov	ebx, [esi]
  3207 0000578D F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
  3208 00005790 7413                <1> 	jz	short dmem_acc_3	; parent process does not use this page
  3209 00005792 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
  3210 00005796 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
  3211 0000579B 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
  3212 0000579D 7506                <1> 	jne	short dmem_acc_3	; not same page
  3213                              <1> 				; deallocate the child's page
  3214 0000579F 800E02              <1>         or      byte [esi], PTE_A_WRITE ; convert to writable page (parent)
  3215                              <1> 	;pop	ebx
  3216 000057A2 59                  <1> 	pop	ecx
  3217 000057A3 EB0C                <1> 	jmp	short dmem_acc_5
  3218                              <1> dmem_acc_3:
  3219                              <1> 	;pop	ebx
  3220 000057A5 59                  <1> 	pop	ecx
  3221                              <1> dmem_acc_4:	
  3222 000057A6 66A90004            <1> 	test	ax, PTE_SHARED ; shared or direct memory access indicator
  3223 000057AA 7505                <1> 	jnz	short dmem_acc_5   ; AVL bit 1 = 1, do not deallocate this page!
  3224                              <1> 	;
  3225                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3226 000057AC E804F6FFFF          <1> 	call	deallocate_page
  3227                              <1> dmem_acc_5:
  3228                              <1> 	;pop	esi
  3229                              <1> 	;pop	edi
  3230                              <1> dmem_acc_6:
  3231 000057B1 89E8                <1> 	mov	eax, ebp ; physical page (offset=0) address
  3232                              <1> 	; EAX = memory page address
  3233                              <1> 	; EDX = PTE entry address (physical)
  3234 000057B3 660D0704            <1> 	or	ax, PTE_A_PRESENT+PTE_A_USER+PTE_A_WRITE+PTE_SHARED
  3235                              <1> 			; present flag, bit 0 = 1
  3236                              <1> 			; user flag, bit 2 = 1	
  3237                              <1> 			; writable flag, bit 1 = 1
  3238                              <1> 			; direct memory access flag, bit 10 = 1
  3239                              <1> 			; (This page must not be deallocated!)
  3240 000057B7 8902                <1> 	mov	[edx], eax  ; Update PTE value
  3241 000057B9 49                  <1> 	dec	ecx ; remain count of contiguous pages
  3242 000057BA 741E                <1> 	jz	short dmem_acc_8
  3243 000057BC 81C500100000        <1> 	add	ebp, PAGE_SIZE ; next physical page address
  3244                              <1> 	; 22/07/2017
  3245                              <1> 	;mov	eax, ebp
  3246                              <1> 	; 12/05/2017
  3247 000057C2 8B1D[7C6F0100]      <1> 	mov	ebx, [base_addr] ; linear address (virtual+CORE)
  3248 000057C8 81C300100000        <1> 	add	ebx, PAGE_SIZE	; next linear address
  3249 000057CE E938FFFFFF          <1>         jmp     dmem_acc_0
  3250                              <1> dmem_acc_7:  ; ERROR ! 
  3251 000057D3 C7042404000000      <1> 	mov	dword [esp], ERR_MINOR_IM 
  3252                              <1> 		; Insufficient memory (minor) error!
  3253                              <1> 		; Major error = 0 (No protection fault)	
  3254                              <1> 	; cf = 1
  3255                              <1> dmem_acc_8:
  3256 000057DA 58                  <1> 	pop	eax
  3257                              <1> 	;pop	edx
  3258                              <1> 	;pop	ecx
  3259                              <1> 	;pop	ebx
  3260                              <1> 	;pop	ebp
  3261 000057DB C3                  <1> 	retn
  3262                              <1> 
  3263                              <1> deallocate_user_pages:
  3264                              <1> 	; 20/05/2017
  3265                              <1> 	; 15/05/2017
  3266                              <1> 	; 20/02/2017
  3267                              <1> 	; 19/02/2017 (TRDOS 386 = TRDOS v2.0)
  3268                              <1> 	;
  3269                              <1> 	; Deallocate virtually contiguous user pages (memory block)
  3270                              <1> 	; (caller: 'sysdalloc' system call)
  3271                              <1> 	;
  3272                              <1> 	; INPUT ->
  3273                              <1> 	;	EBX = VIRTUAL ADDRESS (beginning address)
  3274                              <1> 	;	ECX = byte count
  3275                              <1> 	;	[u.pgdir] = user's page directory
  3276                              <1> 	;	[u.ppdir] = parent's page directory
  3277                              <1> 	;
  3278                              <1> 	; OUTPUT ->
  3279                              <1> 	;    If CF = 0 	
  3280                              <1> 	;	EAX = Deallocated memory bytes
  3281                              <1> 	;	  (Even if shared or read only pages will not be
  3282                              <1> 	;	   deallocated on M.A.T., this byte count will be
  3283                              <1> 	;	   returned as virtually deallocated bytes; in fact
  3284                              <1> 	;	   virtually deallocated user pages * 4096.) 
  3285                              <1> 	;	EBX = Virtual address (as rounded up)
  3286                              <1> 	;    If CF = 1    	
  3287                              <1> 	;	EAX = 0 (there is not any deallocated pages)
  3288                              <1> 	;
  3289                              <1> 	; Note: Empty page tables will not be deallocated!!!
  3290                              <1> 	;     (they will be deallocated at process termination stage)
  3291                              <1> 	;
  3292                              <1> 	; Modified Registers -> EAX, EDX, ESI, EDI, EBX, ECX, EBP
  3293                              <1> 	;
  3294 000057DC 89DE                <1> 	mov	esi, ebx
  3295 000057DE 89F7                <1> 	mov	edi, esi
  3296 000057E0 01CF                <1> 	add	edi, ecx
  3297 000057E2 81C6FF0F0000        <1> 	add	esi, PAGE_SIZE - 1  ; 4095 (round up)	
  3298 000057E8 C1EE0C              <1> 	shr	esi, PAGE_SHIFT
  3299 000057EB C1EF0C              <1> 	shr	edi, PAGE_SHIFT
  3300 000057EE 89F8                <1> 	mov	eax, edi ; end page
  3301 000057F0 29F0                <1> 	sub	eax, esi ; end page - start page
  3302 000057F2 0F86D5000000        <1> 	jna	da_u_pd_err  ; < 1
  3303 000057F8 89F3                <1> 	mov	ebx, esi
  3304 000057FA C1E30C              <1> 	shl	ebx, PAGE_SHIFT ; virtual address (as rounded up)
  3305 000057FD 53                  <1> 	push	ebx ; *
  3306 000057FE 89C1                <1> 	mov	ecx, eax ; page count
  3307 00005800 C1E00C              <1> 	shl	eax, PAGE_SHIFT ; byte count as adjusted
  3308 00005803 50                  <1> 	push	eax ; **
  3309 00005804 8B1D[B8030300]      <1> 	mov	ebx, [u.pgdir] ; physical addr of user's page dir
  3310 0000580A 81C600040000        <1>  	add	esi, CORE/PAGE_SIZE 
  3311 00005810 89F7                <1> 	mov	edi, esi
  3312 00005812 81E7FF030000        <1> 	and	edi, PTE_MASK ; PTE entry in the page table
  3313 00005818 57                  <1> 	push	edi ; *** ; PTE index (of page directory)
  3314 00005819 C1EE0A              <1> 	shr	esi, PAGE_D_SHIFT - PAGE_SHIFT ; 22-12=10
  3315 0000581C 89F2                <1> 	mov	edx, esi 
  3316                              <1> 	; EDX = PDE index
  3317 0000581E C1E602              <1> 	shl	esi, 2 ; convert PDE index to dword offset
  3318 00005821 01DE                <1> 	add	esi, ebx ; add page directory address
  3319                              <1> da_u_pd_1:
  3320 00005823 AD                  <1> 	lodsd
  3321                              <1> 	;
  3322 00005824 89F5                <1> 	mov	ebp, esi ; 20/02/2017
  3323                              <1> 	; EBP = next PDE address
  3324                              <1> 	;
  3325 00005826 A801                <1> 	test	al, PDE_A_PRESENT ; bit 0, present flag (must be 1)
  3326 00005828 0F8494000000        <1> 	jz	da_u_pd_3 ; 20/05/2017	
  3327 0000582E 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3328                              <1> 	; EAX = PHYSICAL (flat) ADDRESS OF THE PAGE TABLE
  3329 00005832 8B3C24              <1> 	mov	edi, [esp] ; ***
  3330                              <1> 	; EDI = PTE index (of complete page directory)
  3331                              <1> 	;and	edi, PTE_MASK ; PTE entry in the page table
  3332 00005835 C1E702              <1> 	shl	edi, 2 ; convert PTE index to dword offset
  3333 00005838 89FE                <1> 	mov	esi, edi ; PTE offset in page table (0-4092)
  3334 0000583A 01C6                <1> 	add	esi, eax ; now, esi points to requested PTE
  3335                              <1> da_u_pt_0:
  3336 0000583C AD                  <1> 	lodsd
  3337 0000583D A801                <1> 	test	al, PTE_A_PRESENT ; bit 0, present flag (must be 1)
  3338 0000583F 743F                <1> 	jz	short da_u_pt_1
  3339                              <1> 	;
  3340 00005841 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
  3341                              <1> 				  ; (must be 1)
  3342 00005843 7549                <1> 	jnz	short da_u_pt_3
  3343                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
  3344 00005845 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
  3345                              <1> 				   ; as child's page ?
  3346 00005849 744E                <1> 	jz	short da_u_pt_4 ; Clear PTE but don't deallocate the page!
  3347                              <1> 	;
  3348                              <1> 	; check the parent's PTE value is read only & same page or not.. 
  3349                              <1> 	; EDX = page directory entry index (0-1023)
  3350 0000584B 52                  <1> 	push	edx ; ****
  3351                              <1> 	; EDI = page table entry offset (0-4092)
  3352 0000584C 8B1D[BC030300]      <1> 	mov	ebx, [u.ppgdir] ; page directory of the parent process
  3353 00005852 66C1E202            <1> 	shl	dx, 2 ; *4 
  3354 00005856 01D3                <1> 	add	ebx, edx ; PDE address (for the parent)
  3355 00005858 8B13                <1> 	mov	edx, [ebx] ; page table address
  3356 0000585A F6C201              <1> 	test	dl, PDE_A_PRESENT ; present (valid) or not ?
  3357 0000585D 742E                <1> 	jz	short da_u_pt_2	; parent process does not use this page
  3358 0000585F 6681E200F0          <1> 	and	dx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  3359                              <1> 	; EDI = page table entry offset (0-4092)
  3360 00005864 01D7                <1> 	add	edi, edx	; PTE address (for the parent)
  3361 00005866 8B1F                <1> 	mov	ebx, [edi]
  3362 00005868 F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
  3363 0000586B 7420                <1> 	jz	short da_u_pt_2	; parent process does not use this page
  3364 0000586D 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
  3365 00005871 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
  3366 00005876 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
  3367 00005878 7513                <1> 	jne	short da_u_pt_2	; not same page
  3368                              <1> 				; deallocate the child's page
  3369 0000587A 800F02              <1>         or      byte [edi], PTE_A_WRITE ; convert to writable page (parent)
  3370 0000587D 5A                  <1> 	pop	edx ; ****
  3371 0000587E EB19                <1> 	jmp	short da_u_pt_4
  3372                              <1> da_u_pt_1:
  3373 00005880 09C0                <1> 	or	eax, eax	; swapped page ?
  3374 00005882 741C                <1> 	jz	short da_u_pt_5	; no
  3375                              <1> 				; yes
  3376 00005884 D1E8                <1> 	shr	eax, 1
  3377 00005886 E8D1F9FFFF          <1> 	call	unlink_swap_block ; Deallocate swapped page block
  3378                              <1> 				  ; on the swap disk (or in file)
  3379 0000588B EB13                <1> 	jmp	short da_u_pt_5
  3380                              <1> da_u_pt_2:
  3381 0000588D 5A                  <1> 	pop	edx ; ****
  3382                              <1> da_u_pt_3:
  3383 0000588E 66A90004            <1> 	test	ax, PTE_SHARED	; shared or direct memory access indicator
  3384 00005892 7505                <1> 	jnz	short da_u_pt_4	; AVL bit 1 = 1, do not deallocate this page!
  3385                              <1> 	;
  3386                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3387 00005894 E81CF5FFFF          <1> 	call	deallocate_page ; set the mem allocation bit of this page
  3388                              <1> da_u_pt_4:
  3389 00005899 C746FC00000000      <1> 	mov	dword [esi-4], 0 ; clear/reset PTE (child, dupl. as parent)
  3390                              <1> da_u_pt_5:
  3391                              <1> 	; 20/05/2017
  3392 000058A0 58                  <1> 	pop	eax ; *** PTE index (of page directory)
  3393 000058A1 49                  <1> 	dec	ecx ; remain page count
  3394 000058A2 7426                <1> 	jz	short da_u_pd_4
  3395 000058A4 40                  <1> 	inc	eax ; next PTE
  3396 000058A5 6625FF03            <1> 	and	ax, PTE_MASK ; PTE entry index in the page table
  3397 000058A9 50                  <1> 	push	eax ; *** (save again)
  3398                              <1> 	;mov	edi, eax
  3399                              <1> 	;and 	di, PTE_MASK
  3400                              <1> 	;cmp	edi, PAGE_SIZE / 4 ; 1024
  3401                              <1> 	;jnb	short da_u_pd_2
  3402 000058AA 89C7                <1> 	mov	edi, eax
  3403 000058AC C1E702              <1> 	shl	edi, 2 ; convert index to dword offset
  3404                              <1> 	;test	ax, PTE_MASK ; 3FFh
  3405 000058AF 09C0                <1> 	or	eax, eax
  3406 000058B1 7589                <1> 	jnz	short da_u_pt_0 ; 1-1023
  3407                              <1> da_u_pd_2:
  3408 000058B3 42                  <1> 	inc	edx
  3409                              <1> 	; 20/05/2017
  3410 000058B4 6681E2FF03          <1> 	and	dx, PTE_MASK  ; 3FFh
  3411 000058B9 740F                <1> 	jz	short da_u_pd_4  ; 0 (1024)
  3412                              <1> 	;cmp	edx, 1024
  3413                              <1> 	;jnb	short da_u_pd_4
  3414 000058BB 89EE                <1> 	mov	esi, ebp ; 20/02/2017
  3415 000058BD E961FFFFFF          <1> 	jmp	da_u_pd_1
  3416                              <1> da_u_pd_3:
  3417                              <1> 	; 15/05/2017 (empty page directory entry)
  3418 000058C2 81E900040000        <1> 	sub	ecx, 1024
  3419 000058C8 77E9                <1> 	ja	short da_u_pd_2 ; 20/05/2017
  3420                              <1> da_u_pd_4:
  3421 000058CA 58                  <1> 	pop	eax ; **
  3422 000058CB 5B                  <1> 	pop	ebx ; *
  3423 000058CC C3                  <1> 	retn
  3424                              <1> 
  3425                              <1> da_u_pd_err:
  3426 000058CD 31C0                <1> 	xor	eax, eax
  3427 000058CF F9                  <1> 	stc	
  3428 000058D0 C3                  <1> 	retn
  3429                              <1> 
  3430                              <1> allocate_user_pages:
  3431                              <1> 	; 20/05/2017
  3432                              <1> 	; 01/05/2017, 02/05/2017, 15/05/2017
  3433                              <1> 	; 04/03/2017
  3434                              <1> 	; 20/02/2017 (TRDOS 386 = TRDOS v2.0)
  3435                              <1> 	;
  3436                              <1> 	; Allocate physically contiguous user pages (memory block)
  3437                              <1> 	; (caller: 'sysalloc' system call)
  3438                              <1> 	;
  3439                              <1> 	; Note: This procedure does not alloc a page's itself
  3440                              <1> 	;	(page bit) on Memory Allocation Table.
  3441                              <1> 	;	(allocate_memory_block is needed before this proc)
  3442                              <1> 	;
  3443                              <1> 	; INPUT ->
  3444                              <1> 	;	EAX = PHYSICAL ADDRESS (beginning address)
  3445                              <1> 	;	EBX = VIRTUAL ADDRESS (beginning address)
  3446                              <1> 	;	ECX = byte count (>=4096)
  3447                              <1> 	;	[u.pgdir] = user's page directory
  3448                              <1> 	;	
  3449                              <1> 	;	Note: All addresses are (must be) already adjusted
  3450                              <1> 	;	to page	borders, otherwise, lower 12bits of addresses
  3451                              <1> 	;	and byte count would be truncated.
  3452                              <1> 	;
  3453                              <1> 	; OUTPUT ->
  3454                              <1> 	;	none
  3455                              <1> 	;
  3456                              <1> 	;	CF = 1 -> insufficient memory error
  3457                              <1> 	;
  3458                              <1> 	; Note: All pages will be allocated in physical page order 
  3459                              <1> 	;	from the beginning page address. 
  3460                              <1> 	;	* A new page table will be added to the page dir
  3461                              <1> 	;	  when the requested PDE is invalid.
  3462                              <1> 	;	* Those pages will not be added to swap queue
  3463                              <1> 	;	  because main purpose of this allocation is to
  3464                              <1> 	;	  set a direct memory access (DMA controller) buffer.
  3465                              <1> 	;	 (Swapping out a page in a DMA buffer would be wrong!)
  3466                              <1> 	;	* Previous content of page tables (PTEs) would be
  3467                              <1> 	;	  (should be) deallocated before entering this
  3468                              <1> 	;	  procedure. So, new page table entries (PTEs)
  3469                              <1> 	;	  directly will be written without checking
  3470                              <1> 	;	  their previous content.	
  3471                              <1> 	;	* Only solution to increase free memory by removing
  3472                              <1> 	;	  that non-swappable memory block is to terminate
  3473                              <1> 	;	  the process or to wait until the process will 
  3474                              <1> 	;	  deallocate that memory block as itself. ('sysdalloc')
  3475                              <1> 	;	  (No problem, if the process does not grab all of
  3476                              <1> 	;	  -very big amount of- free memory by using
  3477                              <1> 	;	  'sysalloc' system call!?)
  3478                              <1> 	;	  (Even if the process has grabbed all of free memory, 
  3479                              <1> 	;	  no problem if the process is not running in 
  3480                              <1> 	;	  multitasking mode. No problem in multitasking
  3481                              <1> 	;	  mode if there is not another process which is running
  3482                              <1> 	;	  or waiting or sleeping for an event as it's pages
  3483                              <1> 	;	  are swapped-out. But a new process can not start to
  3484                              <1> 	;	  run if all of free memory has beeen allocated 
  3485                              <1> 	;	  by running processes. Deallocation -'sysdalloc'- 
  3486                              <1> 	;	  or terminate a running process is needed 
  3487                              <1> 	;	  in order to run a new process.) 
  3488                              <1> 	;
  3489                              <1> 	; Modified Registers -> EAX, EDX, ESI, EDI, EBX, ECX, EBP
  3490                              <1> 	;
  3491                              <1> 
  3492                              <1> 	; 01/05/2017
  3493 000058D1 662500F0            <1> 	and	ax, ~PAGE_OFF
  3494 000058D5 6681E300F0          <1> 	and	bx, ~PAGE_OFF
  3495                              <1> 	; 02/05/2017 
  3496 000058DA BD00F0FFFF          <1> 	mov	ebp, 0FFFFF000h ; 4 Giga Bytes - 4096 Bytes (for Stack)
  3497 000058DF C1E90C              <1> 	shr	ecx, PAGE_SHIFT ; page count
  3498 000058E2 83F901              <1> 	cmp	ecx, 1
  3499 000058E5 7251                <1> 	jb	short a_u_im_retn
  3500 000058E7 89C2                <1> 	mov	edx, eax
  3501 000058E9 01CA                <1> 	add	edx, ecx
  3502 000058EB 724B                <1> 	jc	short a_u_im_retn
  3503 000058ED 39D5                <1> 	cmp	ebp, edx
  3504 000058EF 7247                <1> 	jb	short a_u_im_retn
  3505 000058F1 89DA                <1> 	mov	edx, ebx
  3506 000058F3 81C200004000        <1> 	add	edx, CORE
  3507 000058F9 723D                <1> 	jc	short a_u_im_retn	
  3508 000058FB 01CA                <1> 	add	edx, ecx
  3509 000058FD 7239                <1> 	jc	short a_u_im_retn
  3510 000058FF 39D5                <1> 	cmp	ebp, edx
  3511 00005901 7235                <1> 	jb	short a_u_im_retn
  3512                              <1> 	;
  3513 00005903 89C5                <1> 	mov	ebp, eax ; physical address
  3514 00005905 89DE                <1> 	mov	esi, ebx
  3515 00005907 81C600004000        <1> 	add	esi, CORE ; start of user's memory (4M) 
  3516 0000590D C1EE0C              <1> 	shr	esi, PAGE_SHIFT ; higher 20 bits of the linear address
  3517                              <1> 	;shr	ecx, PAGE_SHIFT ; page count
  3518 00005910 8B1D[B8030300]      <1> 	mov	ebx, [u.pgdir] ; physical addr of user's page dir
  3519 00005916 89F7                <1> 	mov	edi, esi
  3520 00005918 81E7FF030000        <1> 	and	edi, PTE_MASK ; PTE entry index in the page table
  3521 0000591E 57                  <1> 	push	edi  ; * ; PTE index (in page directory)
  3522 0000591F C1EE0A              <1> 	shr	esi, PAGE_D_SHIFT - PAGE_SHIFT ; 22-12=10
  3523 00005922 89F2                <1> 	mov	edx, esi 
  3524                              <1> 	; EDX = PDE index
  3525 00005924 C1E602              <1> 	shl	esi, 2 ; convert PDE index to dword offset
  3526 00005927 01DE                <1> 	add	esi, ebx ; add page directory address
  3527                              <1> a_u_pd_0:
  3528 00005929 AD                  <1> 	lodsd
  3529                              <1> 	;
  3530 0000592A 89F3                <1> 	mov	ebx, esi ; next PDE address
  3531                              <1> 	;
  3532 0000592C A801                <1> 	test	al, PDE_A_PRESENT ; bit 0, present flag (must be 1)
  3533 0000592E 7513                <1> 	jnz	short a_u_pd_2
  3534                              <1> 	;
  3535                              <1> 	; empty PDE (it does not point to valid page table address)
  3536 00005930 E8A2F2FFFF          <1> 	call	allocate_page  ; (allocate a new page table)
  3537 00005935 7302                <1> 	jnc	short a_u_pd_1 ; OK... now, we have a new page table.
  3538                              <1> 	; cf = 1
  3539                              <1> 	; There is not a free memory page to allocate a new page table !!!
  3540 00005937 5E                  <1> 	pop	esi ; *
  3541                              <1> a_u_im_retn:
  3542 00005938 C3                  <1> 	retn	; return to 'sysalloc' with 'insufficient memory' error
  3543                              <1> 	;
  3544                              <1> a_u_pd_1: ; clear the new page table content 
  3545                              <1> 	; EAX = Physical (base) address of the new page table
  3546 00005939 E813F3FFFF          <1> 	call	clear_page ; Clear page content
  3547                              <1> 	;
  3548 0000593E 0C07                <1> 	or	al, PDE_A_PRESENT + PDE_A_WRITE + PDE_A_USER
  3549                              <1> 		 ; set bit 0, bit 1 and bit 2 to 1
  3550                              <1> 		 ; (present, writable, user)
  3551 00005940 8946FC              <1> 	mov	[esi-4], eax
  3552                              <1> a_u_pd_2:
  3553 00005943 662500F0            <1> 	and	ax, PDE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3554                              <1> 	; EAX = PHYSICAL (flat) ADDRESS OF THE PAGE TABLE
  3555 00005947 8B3C24              <1> 	mov	edi, [esp] ; *
  3556                              <1> 	; EDI = PTE index (of page directory)
  3557                              <1> 	;and	edi, PTE_MASK ; PTE entry index in the page table	
  3558                              <1> 	; EBX = next PDE address
  3559 0000594A 89FE                <1> 	mov	esi, edi ; PTE index in page table (0-1023)
  3560 0000594C C1E702              <1> 	shl	edi, 2 ; convert PTE index to dword offset
  3561 0000594F 01C7                <1> 	add	edi, eax ; now, edi points to requested PTE
  3562                              <1> a_u_pt_0:
  3563                              <1> 	; 02/05/2017
  3564 00005951 8B07                <1> 	mov	eax, [edi]
  3565                              <1> 	;
  3566 00005953 A801                <1> 	test	al, PTE_A_PRESENT ; bit 0, present flag (must be 1)
  3567 00005955 7445                <1> 	jz	short a_u_pt_1
  3568                              <1> 	;
  3569 00005957 A802                <1> 	test	al, PTE_A_WRITE   ; bit 1, writable (r/w) flag
  3570                              <1> 				  ; (must be 1)
  3571 00005959 7550                <1> 	jnz	short a_u_pt_3
  3572                              <1> 	; Read only -duplicated- page (belongs to a parent or a child)
  3573 0000595B 66A90002            <1>         test    ax, PTE_DUPLICATED ; Was this page duplicated 
  3574                              <1> 				   ; as child's page ?
  3575 0000595F 7455                <1> 	jz	short a_u_pt_4	; Clear PTE but don't deallocate the page!
  3576                              <1> 	;
  3577                              <1> 	; check the parent's PTE value is read only & same page or not.. 
  3578                              <1> 	; EDX = page directory entry index (0-1023)
  3579 00005961 52                  <1> 	push	edx ; **
  3580 00005962 53                  <1> 	push	ebx ; ***
  3581                              <1> 	; ESI = page table entry index (0-1023)
  3582                              <1> 	;push	esi ; **** ; 20/05/2017
  3583 00005963 8B1D[BC030300]      <1> 	mov	ebx, [u.ppgdir] ; page directory of the parent process
  3584 00005969 66C1E202            <1> 	shl	dx, 2 ; *4 
  3585 0000596D 01D3                <1> 	add	ebx, edx ; PTE address,0 (for the parent)
  3586 0000596F 8B13                <1> 	mov	edx, [ebx] ; page table address
  3587 00005971 F6C201              <1> 	test	dl, PDE_A_PRESENT ; present (valid) or not ?
  3588 00005974 7433                <1> 	jz	short a_u_pt_2	; parent process does not use this page
  3589 00005976 6681E200F0          <1> 	and	dx, PDE_A_CLEAR ; 0F000h ; Clear attribute bits
  3590 0000597B 66C1E602            <1> 	shl	si, 2 ; *4
  3591                              <1> 	; ESI = page table entry offset (0-4092)
  3592 0000597F 01D6                <1> 	add	esi, edx	; PTE address (for the parent)
  3593 00005981 8B1E                <1> 	mov	ebx, [esi]
  3594 00005983 F6C301              <1> 	test	bl, PTE_A_PRESENT ; present or not ?
  3595 00005986 7421                <1> 	jz	short a_u_pt_2	; parent process does not use this page
  3596 00005988 662500F0            <1> 	and	ax, PTE_A_CLEAR ; 0F000h ; Clear attribute bits 
  3597 0000598C 6681E300F0          <1> 	and	bx, PTE_A_CLEAR ; 0F000h ; Clear attribute bits
  3598 00005991 39D8                <1> 	cmp	eax, ebx	; parent's and child's pages are same ?
  3599 00005993 7514                <1> 	jne	short a_u_pt_2	; not same page
  3600                              <1> 				; deallocate the child's page
  3601 00005995 800E02              <1>         or      byte [esi], PTE_A_WRITE ; convert to writable page (parent)
  3602                              <1> 	;pop	esi ; **** ; 20/05/2017
  3603 00005998 5B                  <1> 	pop	ebx ; ***
  3604 00005999 5A                  <1> 	pop	edx ; **
  3605 0000599A EB1A                <1> 	jmp	short a_u_pt_4
  3606                              <1> a_u_pt_1:
  3607 0000599C 09C0                <1> 	or	eax, eax	; swapped page ?
  3608 0000599E 7416                <1> 	jz	short a_u_pt_4	; no
  3609                              <1> 				; yes
  3610 000059A0 D1E8                <1> 	shr	eax, 1
  3611 000059A2 E8B5F8FFFF          <1> 	call	unlink_swap_block ; Deallocate swapped page block
  3612                              <1> 				  ; on the swap disk (or in file)
  3613 000059A7 EB0D                <1> 	jmp	short a_u_pt_4
  3614                              <1> a_u_pt_2:
  3615                              <1> 	;pop	esi ; **** ; 20/05/2017
  3616 000059A9 5B                  <1> 	pop	ebx ; ***
  3617 000059AA 5A                  <1> 	pop	edx ; **
  3618                              <1> a_u_pt_3:
  3619 000059AB 66A90004            <1> 	test	ax, PTE_SHARED	; shared or direct memory access indicator
  3620 000059AF 7505                <1> 	jnz	short a_u_pt_4	; AVL bit 1 = 1, do not deallocate this page!
  3621                              <1> 	;
  3622                              <1> 	;and	ax, PTE_A_CLEAR ; 0F000h ; clear lower 12 (attribute) bits
  3623 000059B1 E8FFF3FFFF          <1> 	call	deallocate_page ; set the mem allocation bit of this page
  3624                              <1> 	;
  3625                              <1> a_u_pt_4:
  3626 000059B6 89E8                <1> 	mov	eax, ebp ; physical address
  3627 000059B8 0C07                <1> 	or	al, PTE_A_PRESENT + PTE_A_WRITE + PTE_A_USER ; 04/03/2017
  3628 000059BA AB                  <1> 	stosd
  3629 000059BB 5E                  <1> 	pop	esi ; * ; 20/05/2017
  3630 000059BC 49                  <1> 	dec	ecx ; remain page count
  3631 000059BD 7417                <1> 	jz	short a_u_pd_5
  3632 000059BF 81C500100000        <1> 	add	ebp, PAGE_SIZE
  3633 000059C5 46                  <1> 	inc	esi ; next PTE (index)
  3634                              <1> 	; 20/05/2017
  3635                              <1> 	;cmp	esi, PAGE_SIZE/4 ; 1024
  3636                              <1> 	;jb	short a_u_pt_0
  3637 000059C6 6681E6FF03          <1> 	and	si, PTE_MASK ; 3FFh (0 to 1023)
  3638 000059CB 56                  <1> 	push	esi ; *
  3639 000059CC 7583                <1> 	jnz	short a_u_pt_0 ; > 0 (<1024)
  3640                              <1> a_u_pd_3:
  3641 000059CE 42                  <1> 	inc	edx
  3642                              <1> ;	cmp	edx, 1024
  3643                              <1> ;	jnb	short a_u_pd_4 ; 02/05/2017 (error!, ecx > 0)
  3644 000059CF 89DE                <1> 	mov	esi, ebx ; the next PDE address
  3645 000059D1 E953FFFFFF          <1> 	jmp	a_u_pd_0
  3646                              <1> a_u_pd_4:
  3647                              <1> 	; 02/05/2017
  3648                              <1> ;	stc
  3649                              <1> a_u_pd_5:
  3650                              <1> 	; 20/05/2017
  3651                              <1> 	;pop	edi ; *
  3652 000059D6 C3                  <1> 	retn
  3653                              <1> 
  3654                              <1> 
  3655                              <1> ; /// End Of MEMORY MANAGEMENT FUNCTIONS ///
  3656                              <1> 
  3657                              <1> ;; Data:
  3658                              <1> 
  3659                              <1> ; 09/03/2015
  3660                              <1> ;swpq_count: dw 0 ; count of pages on the swap que
  3661                              <1> ;swp_drv:    dd 0 ; logical drive description table address of the swap drive/disk
  3662                              <1> ;swpd_size:  dd 0 ; size of swap drive/disk (volume) in sectors (512 bytes). 		  				
  3663                              <1> ;swpd_free:  dd 0 ; free page blocks (4096 bytes) on swap disk/drive (logical)
  3664                              <1> ;swpd_next:  dd 0 ; next free page block
  3665                              <1> ;swpd_last:  dd 0 ; last swap page block
  2160                                  %include 'timer.s'   ; 17/01/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - timer.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 15/01/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 17/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ;
    15                              <1> ; Derived from 'IBM PC-AT' BIOS source code (1985) 
    16                              <1> ; ****************************************************************************
    17                              <1> 
    18                              <1> ; TRDOS 386  (TRDOS v2.0) Kernel - TIMER & REAL TIME CLOCK (BIOS) FUNCTIONS
    19                              <1> 
    20                              <1> ; IBM PC-AT BIOS Source Code ('BIOS2.ASM')
    21                              <1> ; TITLE BIOS2 ---- 06/10/85 BIOS INTERRUPT ROUTINES
    22                              <1> 
    23                              <1> ;
    24                              <1> ; ///////// TIMER (& REAL TIME CLOCK) FUNCTIONS ///////////////
    25                              <1> 
    26                              <1> int1Ah:
    27                              <1> 	; 29/01/2016
    28                              <1> 	; 17/01/2016 (TRDOS 386 = TRDOS v2.0)
    29 000059D7 9C                  <1> 	pushfd
    30 000059D8 0E                  <1> 	push 	cs
    31 000059D9 E801000000          <1> 	call 	TIME_OF_DAY_1
    32 000059DE C3                  <1> 	retn
    33                              <1> 
    34                              <1> ;--- INT  1A H -- (TIME OF DAY) -------------------------------------------------
    35                              <1> ;       THIS BIOS ROUTINE ALLOWS THE CLOCKS TO BE SET OR READ			:
    36                              <1> ;										:
    37                              <1> ; PARAMETERS:									:
    38                              <1> ;     (AH) = 00H  READ THE CURRENT SETTING AND RETURN WITH,			:
    39                              <1> ;                      (CX) = HIGH PORTION OF COUNT				:
    40                              <1> ;                      (DX) = LOW PORTION OF COUNT				:
    41                              <1> ;                      (AL) = 0 TIMER HAS NOT PASSED 24 HOURS SINCE LAST READ	:
    42                              <1> ;                             1 IF ON ANOTHER DAY. (RESET TO ZERO AFTER READ)	:
    43                              <1> ;										:
    44                              <1> ;     (AH) = 01H  SET THE CURRENT CLOCK USING,					:
    45                              <1> ;		     (CX) = HIGH PORTION OF COUNT				:
    46                              <1> ;		     (DX) = LOW PORTION OF COUNT.				:
    47                              <1> ;										:
    48                              <1> ;               NOTE: COUNTS OCCUR AT THE RATE OF 1193180/65536 COUNTS/SECOND	:
    49                              <1> ;                            (OR ABOUT 18.2 PER SECOND -- SEE EQUATES)		:
    50                              <1> ;										:
    51                              <1> ;     (AH) = 02H  READ THE REAL TIME CLOCK AND RETURN WITH,			:
    52                              <1> ;                      (CH) = HOURS IN BCD (00-23)				:
    53                              <1> ;                      (CL) = MINUTES IN BCD (00-59)				:
    54                              <1> ;                      (DH) = SECONDS IN BCD (00-59)				:
    55                              <1> ;                      (DL) = DAYLIGHT SAVINGS ENABLE (00-01)			:
    56                              <1> ;										:
    57                              <1> ;     (AH) = 03H  SET THE REAL TIME CLOCK USING,				:
    58                              <1> ;                     (CH) = HOURS IN BCD (00-23)				:
    59                              <1> ;                     (CL) = MINUTES IN BCD (00-59)				:
    60                              <1> ;                     (DH) = SECONDS IN BCD (00-59)				:
    61                              <1> ;                     (DL) = 01 IF DAYLIGHT SAVINGS ENABLE OPTION, ELSE 00.	:
    62                              <1> ;										:
    63                              <1> ;             NOTE: (DL) = 00 IF DAYLIGHT SAVINGS TIME ENABLE IS NOT ENABLED.	:
    64                              <1> ;                   (DL) = 01 ENABLES TWO SPECIAL UPDATES THE LAST SUNDAY IN	:
    65                              <1> ;	           APRIL   (1:59:59 --> 3:00:00 AM) AND THE LAST SUNDAY IN	:
    66                              <1> ;                   OCTOBER (1:59:59 --> 1:00:00 AM) THE FIRST TIME.		:
    67                              <1> ;										:
    68                              <1> ;     (AH) = 04H  READ THE DATE FROM THE REAL TIME CLOCK AND RETURN WITH,	:
    69                              <1> ;                      (CH) = CENTURY IN BCD (19 OR 20)				:
    70                              <1> ;                      (CL) = YEAR IN BCD (00-99)				:
    71                              <1> ;                      (DH) = MONTH IN BCD (01-12)				:
    72                              <1> ;                      (DL) = DAY IN BCD (01-31).				:
    73                              <1> ;										:
    74                              <1> ;     (AH) = 05H  SET THE DATE INTO THE REAL TIME CLOCK USING,			:
    75                              <1> ;                     (CH) = CENTURY IN BCD (19 OR 20)				:
    76                              <1> ;                     (CL) = YEAR IN BCD (00-99)				:
    77                              <1> ;                     (DH) = MONTH IN BCD (01-12)				:
    78                              <1> ;                     (DL) = DAY IN BCD (01-31).				:
    79                              <1> ;										:
    80                              <1> ;     (AH) = 06H  SET THE ALARM TO INTERRUPT AT SPECIFIED TIME,			:
    81                              <1> ;                     (CH) = HOURS IN BCD (00-23 (OR FFH))			:
    82                              <1> ;                     (CL) = MINUTES IN BCD (00-59 (OR FFH))			:
    83                              <1> ;                     (DH) = SECONDS IN BCD (00-59 (OR FFH))			:
    84                              <1> ;										:
    85                              <1> ;     (AH) = 07H  RESET THE ALARM INTERRUPT FUNCTION.				:
    86                              <1> ;										:
    87                              <1> ; NOTES: FOR ALL RETURNS CY= 0 FOR SUCCESSFUL OPERATION.			:
    88                              <1> ;        FOR (AH)= 2, 4, 6 - CARRY FLAG SET IF REAL TIME CLOCK NOT OPERATING.	:
    89                              <1> ;        FOR (AH)= 6 - CARRY FLAG SET IF ALARM ALREADY ENABLED. 		:
    90                              <1> ;        FOR THE ALARM FUNCTION (AH = 6) THE USER MUST SUPPLY A ROUTINE AND	:
    91                              <1> ;         INTERCEPT THE CORRECT ADDRESS IN THE VECTOR TABLE FOR INTERRUPT 4AH.	:
    92                              <1> ;         USE 0FFH FOR ANY "DO NOT CARE" POSITION FOR INTERVAL INTERRUPTS.	:
    93                              <1> ;        INTERRUPTS ARE DISABLED DURING DATA MODIFICATION. 			:
    94                              <1> ;        AH & AL ARE RETURNED MODIFIED AND NOT DEFINED EXCEPT WHERE INDICATED.	:
    95                              <1> ;--------------------------------------------------------------------------------
    96                              <1> 
    97                              <1> ; 15/01/2017
    98                              <1> ; 14/01/2017
    99                              <1> ; 07/01/2017
   100                              <1> ; 02/01/2017
   101                              <1> ; 29/05/2016
   102                              <1> ; 29/01/2016
   103                              <1> ; 17/01/2016 (TRDOS 386 = TRDOS v2.0)
   104                              <1> 
   105                              <1> ; 29/05/2016
   106                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   107                              <1> int35h:  ; Date/Time functions
   108                              <1> 
   109                              <1> TIME_OF_DAY_1:
   110                              <1> 	;sti				; INTERRUPTS BACK ON
   111                              <1> 	; 29/05/2016
   112 000059DF 80642408FE          <1> 	and	byte [esp+8], 11111110b	; clear carry bit of eflags register
   113                              <1> 	;
   114 000059E4 80FC08              <1> 	cmp	ah, (RTC_TBE-RTC_TB)/4	; CHECK IF COMMAND IN VALID RANGE (0-7)
   115 000059E7 F5                  <1> 	cmc				; COMPLEMENT CARRY FOR ERROR EXIT
   116                              <1> 	; (*) jc short TIME_9		; EXIT WITH CARRY = 1 IF NOT VALID
   117 000059E8 721A                <1> 	jc	short _TIME_9 ; 29/05/2016
   118                              <1> 
   119 000059EA 1E                  <1> 	push	ds
   120 000059EB 56                  <1> 	push	esi
   121 000059EC 66BE1000            <1> 	mov	si, KDATA		; kernel data segment
   122 000059F0 8EDE                <1> 	mov	ds, si
   123                              <1> 
   124                              <1> 	;;15/01/2017
   125                              <1> 	; 14/01/2017
   126                              <1> 	; 02/01/2017
   127                              <1> 	;;mov	byte [intflg], 35h	; date & time interrupt 
   128                              <1> 	;sti
   129                              <1> 	;
   130 000059F2 C0E402              <1> 	shl	ah, 2			; convert function to dword offset
   131 000059F5 0FB6F4              <1> 	movzx	esi, ah			; PLACE INTO ADDRESSING REGISTER
   132                              <1> 	;cli				; NO INTERRUPTS DURING TIME FUNCTIONS
   133 000059F8 FF96[0A5A0000]      <1> 	call	[esi+RTC_TB]		; VECTOR TO FUNCTION REQUESTED WITH CY=0
   134                              <1> 					; RETURN WITH CARRY FLAG SET FOR RESULT
   135                              <1> 	;sti				; INTERRUPTS BACK ON
   136 000059FE B400                <1> 	mov	ah, 0			; CLEAR (AH) TO ZERO
   137 00005A00 5E                  <1> 	pop	esi			; RECOVER USERS REGISTER
   138 00005A01 1F                  <1> 	pop	ds			; RECOVER USERS SEGMENT SELECTOR
   139                              <1> 
   140                              <1> 	;;15/01/2017
   141                              <1> 	; 02/01/2017
   142                              <1> 	;;mov	byte [ss:intflg], 0 ; 07/01/2017
   143                              <1> 
   144                              <1> ;TIME_9:
   145                              <1> 					; RETURN WITH CY= 0 IF NO ERROR
   146                              <1> 	; (*) 29/05/2016
   147                              <1> 	; (*) retf 4 ; skip eflags on stack
   148 00005A02 7305                <1> 	jnc	short _TIME_10
   149                              <1> _TIME_9:
   150                              <1> 	; 29/05/2016 -set carry flag on stack-
   151                              <1> 	; [esp] = EIP
   152                              <1> 	; [esp+4] = CS
   153                              <1> 	; [esp+8] = E-FLAGS
   154 00005A04 804C240801          <1> 	or	byte [esp+8], 1	 ; set carry bit of eflags register
   155                              <1> 	; [esp+12] = ESP (user)
   156                              <1> 	; [esp+16] = SS (User)
   157                              <1> _TIME_10:
   158 00005A09 CF                  <1> 	iretd
   159                              <1> 	
   160                              <1> 	; (*) 29/05/2016 - 'ref 4' intruction causes to stack fault
   161                              <1> 	; (OUTER-PRIVILEGE-LEVEL)
   162                              <1> 	; INTEL 80386 PROGRAMMER'S REFERENCE MANUAL 1986
   163                              <1> 	; // RETF instruction:
   164                              <1> 	;
   165                              <1> 	; IF OperandMode=32 THEN
   166                              <1>  	;    Load CS:EIP from stack;
   167                              <1>  	;    Set CS RPL to CPL;
   168                              <1>  	;    Increment eSP by 8 plus the immediate offset if it exists;
   169                              <1>  	;    Load SS:eSP from stack;
   170                              <1>  	; ELSE (* OperandMode=16 *)
   171                              <1>  	;    Load CS:IP from stack;
   172                              <1>  	;    Set CS RPL to CPL;
   173                              <1>  	;    Increment eSP by 4 plus the immediate offset if it exists;
   174                              <1> 	;    Load SS:eSP from stack;
   175                              <1>  	; FI;
   176                              <1> 	;
   177                              <1> 	; //					
   178                              <1> 					; ROUTINE VECTOR TABLE (AH)=
   179                              <1> RTC_TB:
   180 00005A0A [2A5A0000]          <1> 	dd	RTC_00			; 0 = READ CURRENT CLOCK COUNT
   181 00005A0E [3D5A0000]          <1> 	dd	RTC_10			; 1 = SET CLOCK COUNT
   182 00005A12 [4B5A0000]          <1> 	dd	RTC_20			; 2 = READ THE REAL TIME CLOCK TIME
   183 00005A16 [7A5A0000]          <1> 	dd	RTC_30			; 3 = SET REAL TIME CLOCK TIME
   184 00005A1A [BC5A0000]          <1> 	dd	RTC_40			; 4 = READ THE REAL TIME CLOCK DATE
   185 00005A1E [E95A0000]          <1> 	dd	RTC_50			; 5 = SET REAL TIME CLOCK DATE
   186 00005A22 [365B0000]          <1> 	dd	RTC_60			; 6 = SET THE REAL TIME CLOCK ALARM
   187 00005A26 [895B0000]          <1> 	dd	RTC_70			; 7 = RESET ALARM
   188                              <1> 
   189                              <1> RTC_TBE	equ	$
   190                              <1> 
   191                              <1> RTC_00:				; READ TIME COUNT
   192 00005A2A A0[44590100]        <1> 	mov	al, [TIMER_OFL]		; GET THE OVERFLOW FLAG
   193 00005A2F C605[44590100]00    <1> 	mov	byte [TIMER_OFL], 0	; AND THEN RESET THE OVERFLOW FLAG
   194 00005A36 8B0D[40590100]      <1>         mov     ecx, [TIMER_LH]         ; GET COUNT OF TIME
   195 00005A3C C3                  <1> 	retn
   196                              <1> 
   197                              <1> RTC_10:				; SET TIME COUNT
   198 00005A3D 890D[40590100]      <1>         mov     [TIMER_LH], ecx         ; SET TIME COUNT
   199 00005A43 C605[44590100]00    <1> 	mov	byte [TIMER_OFL], 0	; RESET OVERFLOW FLAG
   200 00005A4A C3                  <1> 	retn				; RETURN WITH NO CARRY
   201                              <1> 
   202                              <1> RTC_20:				; GET RTC TIME
   203 00005A4B E8EB010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   204 00005A50 7227                <1> 	jc	short RTC_29		; EXIT IF ERROR (CY= 1)
   205                              <1> 
   206 00005A52 B000                <1> 	mov	al, CMOS_SECONDS	; SET ADDRESS OF SECONDS
   207 00005A54 E8FD010000          <1> 	call	CMOS_READ		; GET SECONDS
   208 00005A59 88C6                <1> 	mov	dh, al			; SAVE
   209 00005A5B B00B                <1> 	mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   210 00005A5D E8F4010000          <1> 	call	CMOS_READ		; READ CURRENT VALUE OF DSE BIT
   211 00005A62 2401                <1> 	and	al, 00000001b		; MASK FOR VALID DSE BIT
   212 00005A64 88C2                <1> 	mov	dl, al			; SET [DL] TO ZERO FOR NO DSE BIT
   213 00005A66 B002                <1> 	mov	al, CMOS_MINUTES	; SET ADDRESS OF MINUTES
   214 00005A68 E8E9010000          <1> 	call	CMOS_READ		; GET MINUTES
   215 00005A6D 88C1                <1> 	mov	cl, al			; SAVE
   216 00005A6F B004                <1>         mov     al, CMOS_HOURS          ; SET ADDRESS OF HOURS
   217 00005A71 E8E0010000          <1> 	call	CMOS_READ		; GET HOURS
   218 00005A76 88C5                <1> 	mov	ch, al			; SAVE
   219 00005A78 F8                  <1> 	clc				; SET CY= 0
   220                              <1> RTC_29:
   221 00005A79 C3                  <1> 	retn				; RETURN WITH RESULT IN CARRY FLAG
   222                              <1> 
   223                              <1> RTC_30:				; SET RTC TIME
   224 00005A7A E8BC010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   225 00005A7F 7305                <1> 	jnc	short RTC_35		; GO AROUND IF CLOCK OPERATING
   226 00005A81 E817010000          <1> 	call	RTC_STA			; ELSE TRY INITIALIZING CLOCK
   227                              <1> RTC_35:
   228 00005A86 88F4                <1> 	mov	ah, dh			; GET TIME BYTE - SECONDS
   229 00005A88 B000                <1> 	mov	al, CMOS_SECONDS	; ADDRESS SECONDS
   230 00005A8A E8E0010000          <1> 	call	CMOS_WRITE		; UPDATE SECONDS
   231 00005A8F 88CC                <1> 	mov	ah, cl			; GET TIME BYTE - MINUTES
   232 00005A91 B002                <1> 	mov	al, CMOS_MINUTES	; ADDRESS MINUTES
   233 00005A93 E8D7010000          <1> 	call	CMOS_WRITE		; UPDATE MINUTES
   234 00005A98 88EC                <1> 	mov	ah, ch			; GET TIME BYTE - HOURS
   235 00005A9A B004                <1> 	mov	al, CMOS_HOURS		; ADDRESS HOURS
   236 00005A9C E8CE010000          <1> 	call	CMOS_WRITE		; UPDATE ADDRESS
   237                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   238                              <1> 	;mov	ah, al
   239 00005AA1 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257
   240 00005AA5 E8AC010000          <1> 	call	CMOS_READ		; READ CURRENT TIME
   241 00005AAA 2462                <1> 	and	al, 01100010b		; MASK FOR VALID BIT POSITIONS
   242 00005AAC 0C02                <1> 	or	al, 00000010b		; TURN ON 24 HOUR MODE
   243 00005AAE 80E201              <1> 	and	dl, 00000001b		; USE ONLY THE DSE BIT
   244 00005AB1 08D0                <1> 	or	al, dl			; GET DAY LIGHT SAVINGS TIME BIT (OSE)
   245 00005AB3 86E0                <1> 	xchg	ah, al			; PLACE IN WORK REGISTER AND GET ADDRESS
   246 00005AB5 E8B5010000          <1> 	call	CMOS_WRITE		; SET NEW ALARM SITS
   247 00005ABA F8                  <1> 	clc				; SET CY= 0
   248 00005ABB C3                  <1> 	retn				; RETURN WITH CY= 0
   249                              <1> 
   250                              <1> RTC_40:				; GET RTC DATE
   251 00005ABC E87A010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   252 00005AC1 7225                <1> 	jc	short RTC_49		; EXIT IF ERROR (CY= 1)
   253                              <1> 
   254 00005AC3 B007                <1> 	mov	al, CMOS_DAY_MONTH	; ADDRESS DAY OF MONTH
   255 00005AC5 E88C010000          <1> 	call	CMOS_READ		; READ DAY OF MONTH
   256 00005ACA 88C2                <1> 	mov	dl, al			; SAVE
   257 00005ACC B008                <1> 	mov	al, CMOS_MONTH		; ADDRESS MONTH
   258 00005ACE E883010000          <1> 	call	CMOS_READ		; READ MONTH
   259 00005AD3 88C6                <1> 	mov	dh, al			; SAVE
   260 00005AD5 B009                <1> 	mov	al, CMOS_YEAR		; ADDRESS YEAR
   261 00005AD7 E87A010000          <1> 	call	CMOS_READ		; READ YEAR
   262 00005ADC 88C1                <1> 	mov	cl, al			; SAVE
   263 00005ADE B032                <1> 	mov	al, CMOS_CENTURY	; ADDRESS CENTURY LOCATION
   264 00005AE0 E871010000          <1> 	call	CMOS_READ		; GET CENTURY BYTE
   265 00005AE5 88C5                <1> 	mov	ch, al			; SAVE
   266 00005AE7 F8                  <1> 	clc				; SET CY=0
   267                              <1> RTC_49:
   268 00005AE8 C3                  <1> 	retn				; RETURN WITH RESULTS IN CARRY FLAG
   269                              <1> 
   270                              <1> RTC_50:				; SET RTC DATE
   271 00005AE9 E84D010000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   272 00005AEE 7305                <1> 	jnc	short RTC_55		; GO AROUND IF NO ERROR
   273 00005AF0 E8A8000000          <1> 	call	RTC_STA			; ELSE INITIALIZE CLOCK
   274                              <1> RTC_55:
   275 00005AF5 66B80600            <1> 	mov	ax, CMOS_DAY_WEEK	; ADDRESS OF DAY OF WEEK BYTE
   276 00005AF9 E871010000          <1> 	call	CMOS_WRITE		; LOAD ZEROS TO DAY OF WEEK
   277 00005AFE 88D4                <1> 	mov	ah, dl			; GET DAY OF MONTH BYTE
   278 00005B00 B007                <1> 	mov	al, CMOS_DAY_MONTH	; ADDRESS DAY OF MONTH BYTE
   279 00005B02 E868010000          <1> 	call	CMOS_WRITE		; WRITE OF DAY OF MONTH REGISTER
   280 00005B07 88F4                <1> 	mov	ah, dh			; GET MONTH
   281 00005B09 B008                <1> 	mov	al, CMOS_MONTH		; ADDRESS MONTH BYTE
   282 00005B0B E85F010000          <1> 	call	CMOS_WRITE		; WRITE MONTH REGISTER
   283 00005B10 88CC                <1> 	mov	ah, cl			; GET YEAR BYTE
   284 00005B12 B009                <1> 	mov	al, CMOS_YEAR		; ADDRESS YEAR REGISTER
   285 00005B14 E856010000          <1> 	call	CMOS_WRITE		; WRITE YEAR REGISTER
   286 00005B19 88EC                <1> 	mov	ah, ch			; GET CENTURY BYTE
   287 00005B1B B032                <1> 	mov	al, CMOS_CENTURY	; ADDRESS CENTURY BYTE
   288 00005B1D E84D010000          <1> 	call	CMOS_WRITE		; WRITE CENTURY LOCATION
   289                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   290                              <1> 	;mov	ah, al
   291 00005B22 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257
   292 00005B26 E82B010000          <1> 	call	CMOS_READ		; READ WIRRENT SETTINGS
   293 00005B2B 247F                <1> 	and	al, 07Fh		; CLEAR 'SET BIT'
   294 00005B2D 86E0                <1> 	xchg	ah, al			; MOVE TO WORK REGISTER
   295 00005B2F E83B010000          <1> 	call	CMOS_WRITE		; AND START CLOCK UPDATING
   296 00005B34 F8                  <1> 	clc				; SET CY= 0
   297 00005B35 C3                  <1> 	retn				; RETURN CY=0
   298                              <1> 
   299                              <1> RTC_60:				; SET RTC ALARM
   300 00005B36 B00B                <1> 	mov	al, CMOS_REG_B		; ADDRESS ALARM
   301 00005B38 E819010000          <1> 	call	CMOS_READ		; READ ALARM REGISTER
   302 00005B3D A820                <1> 	test	al, 20h			; CHECK FOR ALARM ALREADY ENABLED
   303 00005B3F F9                  <1> 	stc				; SET CARRY IN CASE OF ERROR
   304 00005B40 7542                <1> 	jnz	short RTC_69		; ERROR EXIT IF ALARM SET
   305 00005B42 E8F4000000          <1> 	call	UPD_IPR			; CHECK FOR UPDATE IN PROCESS
   306 00005B47 7305                <1> 	jnc	short RTC_65		; SKIP INITIALIZATION IF NO ERROR
   307 00005B49 E84F000000          <1> 	call	RTC_STA			; ELSE INITIALIZE CLOCK
   308                              <1> RTC_65:	
   309 00005B4E 88F4                <1> 	mov	ah, dh			; GET SECONDS BYTE
   310 00005B50 B001                <1> 	mov	al, CMOS_SEC_ALARM	; ADDRESS THE SECONDS ALARM REGISTER
   311 00005B52 E818010000          <1> 	call	CMOS_WRITE		; INSERT SECONDS
   312 00005B57 88CC                <1> 	mov	ah, cl			; GET MINUTES PARAMETER
   313 00005B59 B003                <1> 	mov	al, CMOS_MIN_ALARM	; ADDRESS MINUTES ALARM REGISTER
   314 00005B5B E80F010000          <1> 	call	CMOS_WRITE		; INSERT MINUTES
   315 00005B60 88EC                <1> 	mov	ah, ch			; GET HOURS PARAMETER
   316 00005B62 B005                <1> 	mov	al, CMOS_HR_ALARM	; ADDRESS HOUR ALARM REGISTER
   317 00005B64 E806010000          <1> 	call	CMOS_WRITE		; INSERT HOURS
   318 00005B69 E4A1                <1> 	in	al, INTB01		; READ SECOND INTERRUPT MASK REGISTER
   319 00005B6B 24FE                <1> 	and	al, 0FEh		; ENABLE ALARM TIMER BIT (CY= 0)
   320 00005B6D E6A1                <1> 	out	INTB01, al		; WRITE UPDATED MASK
   321                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   322                              <1> 	;mov	ah, al
   323 00005B6F 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257
   324 00005B73 E8DE000000          <1> 	call	CMOS_READ		; READ CURRENT ALARM REGISTER
   325 00005B78 247F                <1> 	and	al, 07Fh		; ENSURE SET BIT TURNED OFF
   326 00005B7A 0C20                <1> 	or	al, 20h			; TURN ON ALARM ENABLE
   327 00005B7C 86E0                <1> 	xchg	ah, al			; MOVE MASK TO OUTPUT REGISTER
   328 00005B7E E8EC000000          <1> 	call	CMOS_WRITE		; WRITE NEW ALARM MASK
   329 00005B83 F8                  <1> 	clc				; SET CY= 0
   330                              <1> RTC_69:
   331 00005B84 66B80000            <1> 	mov	ax, 0			; CLEAR AX REGISTER
   332 00005B88 C3                  <1> 	retn				; RETURN WITH RESULTS IN CARRY FLAC
   333                              <1> 
   334                              <1> RTC_70:				; RESET ALARM
   335                              <1> 	;mov	al, CMOS_REG_B		; ADDRESS ALARM REGISTER
   336                              <1> 	;mov	ah, al
   337 00005B89 66B80B0B            <1> 	mov	ax, CMOS_REG_B * 257	; ADDRESS ALARM REGISTER (TO BOTH AH,AL)
   338 00005B8D E8C4000000          <1> 	call	CMOS_READ		; READ ALARM REGISTER
   339 00005B92 2457                <1> 	and	al, 57h			; TURN OFF ALARM ENABLE
   340 00005B94 86E0                <1> 	xchg	ah, al			; SAVE DATA AND RECOVER ADDRESS
   341 00005B96 E8D4000000          <1> 	call	CMOS_WRITE		; RESTORE NEW VALUE
   342 00005B9B F8                  <1> 	clc				; SET CY= 0
   343 00005B9C C3                  <1> 	retn				; RETURN WITH NO CARRY
   344                              <1> 
   345                              <1> RTC_STA:			; INITIALIZE REAL TIME CLOCK
   346                              <1> 	;mov	al, CMOS_REG_A		; ADDRESS REGISTER A AND LOAD DATA MASK		
   347                              <1> 	;mov	ah, 26h
   348 00005B9D 66B80A26            <1> 	mov	ax, (26h*100h)+CMOS_REG_A
   349 00005BA1 E8C9000000          <1> 	call	CMOS_WRITE		; INITIALIZE STATUS REGISTER A
   350                              <1> 	;mov	al, CMOS_REG_B		; SET "SET BIT" FOR CLOCK INITIALIZATION	
   351                              <1> 	;mov	ah, 82h
   352 00005BA6 66B80B82            <1> 	mov	ax, (82h*100h)+CMOS_REG_B
   353 00005BAA E8C0000000          <1> 	call	CMOS_WRITE		; AND 24 HOUR MODE TO REGISTER B
   354 00005BAF B00C                <1> 	mov	al, CMOS_REG_C		; ADDRESS REGISTER C
   355 00005BB1 E8A0000000          <1> 	call	CMOS_READ		; READ REGISTER C TO INITIALIZE
   356 00005BB6 B00D                <1> 	mov	al, CMOS_REG_D		; ADDRESS REGISTER D
   357 00005BB8 E899000000          <1> 	call	CMOS_READ		; READ REGISTER D TO INITIALIZE
   358 00005BBD C3                  <1> 	retn
   359                              <1> 
   360                              <1> ; 17/01/2016 (TRDOS 386 = TRDOS v2.0)
   361                              <1> 
   362                              <1> ;--- HARDWARE INT  70 H -- ( IRQ LEVEL  8) --------------------------------------
   363                              <1> ; ALARM INTERRUPT HANDLER (RTC)							:
   364                              <1> ;       THIS ROUTINE HANDLES THE PERIODIC AND ALARM INTERRUPTS FROM THE CMOS	:
   365                              <1> ;       TIMER. INPUT FREQUENCY IS 1.024 KHZ OR APPROXIMATELY 1024 INTERRUPTS	:
   366                              <1> ;       EVERY SECOND FOR THE PERIODIC INTERRUPT. FOR THE ALARM FUNCTION,	:
   367                              <1> ;       THE INTERRUPT WILL OCCUR AT THE DESIGNATED TIME.			:
   368                              <1> ;										:
   369                              <1> ;       INTERRUPTS ARE ENABLED WHEN THE EVENT OR ALARM FUNCTION IS ACTIVATED.	:
   370                              <1> ;       FOR THE EVENT INTERRUPT, THE HANDLER WILL DECREMENT THE WAIT COUNTER	:
   371                              <1> ;       AND WHEN IT EXPIRES WILL SET THE DESIGNATED LOCATION TO 80H. FOR	:
   372                              <1> ;       THE ALARM INTERRUPT. THE USER MUST PROVIDE A ROUTINE TO INTERCEPT	:
   373                              <1> ;       THE CORRECT ADDRESS FROM THE VECTOR TABLE INVOKED BY INTERRUPT 4AH	:
   374                              <1> ;       PRIOR TO SETTING THE REAL TIME CLOCK ALARM (INT 1AH, AH= 06H).		:
   375                              <1> ;--------------------------------------------------------------------------------
   376                              <1> 
   377                              <1> RTC_A_INT: ; 07/01/2017
   378                              <1> ;RTC_INT:				; ALARM INTERRUPT
   379 00005BBE 1E                  <1> 	push	ds			; LEAVE INTERRUPTS DISABLED
   380 00005BBF 50                  <1> 	push	eax			; SAVE REGISTERS
   381 00005BC0 57                  <1> 	push	edi
   382                              <1> RTC_I_1:				; CHECK FOR SECOND INTERRUPT
   383 00005BC1 66B88C8B            <1> 	mov	ax, 256*(CMOS_REG_B+NMI)+CMOS_REG_C+NMI ; ALARM AND STATUS
   384 00005BC5 E670                <1> 	out	CMOS_PORT, al		; WRITE ALARM FLAG MASK ADDRESS
   385 00005BC7 90                  <1> 	nop				; I/O DELAY
   386 00005BC8 EB00                <1> 	jmp	short $+2
   387 00005BCA E471                <1> 	in	al, CMOS_DATA		; READ AND RESET INTERRUPT REQUEST FLAGS
   388 00005BCC A860                <1> 	test	al, 01100000b		; CHECK FOR EITHER INTERRUPT PENDING
   389 00005BCE 745D                <1> 	jz	short	RTC_I_9		; EXIT IF NOT A VALID RTC INTERRUPT
   390                              <1> 
   391 00005BD0 86E0                <1> 	xchg	ah, al			; SAVE FLAGS AND GET ENABLE ADDRESS
   392 00005BD2 E670                <1> 	out	CMOS_PORT, al		; WRITE ALARM ENABLE MASK ADDRESS
   393 00005BD4 90                  <1> 	nop				; I/O DELAY
   394 00005BD5 EB00                <1> 	jmp	short $+2	
   395 00005BD7 E471                <1> 	in	al, CMOS_DATA		; READ CURRENT ALARM ENABLE MASK
   396 00005BD9 20E0                <1> 	and	al, ah			; ALLOW ONLY SOURCES THAT ARE ENABLED
   397 00005BDB A840                <1> 	test	al, 01000000b		; CHECK FOR PERIODIC INTERRUPT
   398 00005BDD 743B                <1> 	jz	short RTC_I_5		; SKIP IF NOT A PERIODIC INTERRUPT
   399                              <1> 
   400                              <1> ;-----	DECREMENT WAIT COUNT BY INTERRUPT INTERVAL
   401                              <1> 
   402 00005BDF 66BF1000            <1> 	mov	di, KDATA		; kernel data segment
   403 00005BE3 8EDF                <1> 	mov	ds, di
   404                              <1> 	
   405 00005BE5 812D[38590100]D003- <1> 	sub	dword [RTC_LH], 976	; DECREMENT COUNT BY 1/1024
   405 00005BED 0000                <1>
   406 00005BEF 7329                <1> 	jnc	short RTC_I_5		; SKIP TILL 32 BIT WORD LESS THAN ZERO
   407                              <1> 
   408                              <1> ;-----	TURN OFF PERIODIC INTERRUPT ENABLE
   409                              <1> 
   410 00005BF1 6650                <1> 	push	ax			; SAVE INTERRUPT FLAG MASK
   411 00005BF3 66B88B8B            <1> 	mov	ax, 257*(CMOS_REG_B+NMI) ; INTERRUPT ENABLE REGISTER
   412 00005BF7 E670                <1> 	out	CMOS_PORT, al		; WRITE ADDRESS TO CMOS CLOCK
   413 00005BF9 90                  <1> 	nop				; I/O DELAY
   414 00005BFA EB00                <1> 	jmp	short $+2
   415 00005BFC E471                <1> 	in	al, CMOS_DATA		; READ CURRENT ENABLES
   416 00005BFE 24BF                <1> 	and	al, 0BFh		; TURN OFF PIE
   417 00005C00 86C4                <1> 	xchg	al, ah			; GET CMOS ADDRESS AND SAVE VALUE
   418 00005C02 E670                <1> 	out	CMOS_PORT, al		; ADDRESS REGISTER B
   419 00005C04 86C4                <1> 	xchg	al, ah			; GET NEW INTERRUPT ENABLE MASK
   420 00005C06 E671                <1> 	out	CMOS_DATA, al		; SET MASK IN INTERRUPT ENABLE REGISTER
   421 00005C08 C605[3C590100]00    <1> 	mov	byte [RTC_WAIT_FLAG], 0	; SET FUNCTION ACTIVE FLAG OFF
   422 00005C0F 8B3D[3D590100]      <1> 	mov	edi, [USER_FLAG]	; SET UP (DS:DI) TO POINT TO USER FLAG
   423 00005C15 C60780              <1> 	mov	byte [edi], 80h		; TURN ON USERS FLAG
   424 00005C18 6658                <1> 	pop	ax			; GET INTERRUPT SOURCE BACK
   425                              <1> RTC_I_5:
   426 00005C1A A820                <1> 	test	al, 00100000b		; TEST FOR ALARM INTERRUPT
   427 00005C1C 740D                <1> 	jz	short RTC_I_7		; SKIP USER INTERRUPT CALL IF NOT ALARM
   428                              <1> 
   429 00005C1E B00D                <1> 	mov	al, CMOS_REG_D		; POINT TO DEFAULT READ ONLY REGISTER
   430 00005C20 E670                <1> 	out	CMOS_PORT, al		; ENABLE NMI AND CMOS ADDRESS TO DEFAULT
   431 00005C22 FB                  <1> 	sti				; INTERRUPTS BACK ON NOW
   432 00005C23 52                  <1> 	push	edx
   433 00005C24 E8309E0000          <1> 	call	INT4Ah			; TRANSFER TO USER ROUTINE
   434 00005C29 5A                  <1> 	pop	edx
   435 00005C2A FA                  <1> 	cli				; BLOCK INTERRUPT FOR RETRY
   436                              <1> RTC_I_7:				; RESTART ROUTINE TO HANDLE DELAYED
   437 00005C2B EB94                <1> 	jmp	short RTC_I_1		;  ENTRY AND SECOND EVENT BEFORE DONE
   438                              <1> 
   439                              <1> RTC_I_9:				; EXIT - NO PENDING INTERRUPTS
   440 00005C2D B00D                <1> 	mov	al, CMOS_REG_D		; POINT TO DEFAULT READ ONLY REGISTER
   441 00005C2F E670                <1> 	out	CMOS_PORT, al		; ENABLE NMI AND CMOS ADDRESS TO DEFAULT
   442 00005C31 B020                <1> 	mov	al, EOI			; END OF INTERRUPT MASK TO 8259 - 2
   443 00005C33 E6A0                <1> 	out	INTB00, al		; TO 8259 - 2
   444 00005C35 E620                <1> 	out	INTA00,	al		; TO 8259 - 1
   445 00005C37 5F                  <1> 	pop	edi			; RESTORE REGISTERS
   446 00005C38 58                  <1> 	pop	eax
   447 00005C39 1F                  <1> 	pop	ds
   448 00005C3A CF                  <1> 	iretd				; END OF INTERRUPT
   449                              <1> 
   450                              <1> 	
   451                              <1> 	; 29/05/2016 - TRDOS 386 (TRDOS v2.0)
   452                              <1> 	; 22/08/2014 (Retro UNIX 386 v1)
   453                              <1> 	; IBM PC/AT BIOS source code ----- 10/06/85 (bios2.asm)
   454                              <1> UPD_IPR:				; WAIT TILL UPDATE NOT IN PROGRESS
   455 00005C3B 51                  <1> 	push	ecx
   456                              <1> 
   457                              <1> 	; 29/05/2016
   458 00005C3C B968110000          <1> 	mov	ecx, ((1984+244)*4)/2	; AWARD BIOS 1999, ATIME.ASM		
   459                              <1> 					; 'WAITCPU_CK_UD_STAT'
   460                              <1> 					; (244Us + 1984Us)
   461                              <1> 					; (assume each read takes
   462                              <1> 					;  2 microseconds).
   463                              <1> 	;mov	ecx, 65535		
   464                              <1> 		;mov cx, 800		; SET TIMEOUT LOOP COUNT (= 800)	
   465                              <1> UPD_10:
   466 00005C41 B00A                <1> 	mov	al, CMOS_REG_A		; ADDRESS STATUS REGISTER A
   467 00005C43 FA                  <1> 	cli				; NO TIMER INTERRUPTS DURING UPDATES
   468 00005C44 E80D000000          <1> 	call	CMOS_READ		; READ UPDATE IN PROCESS FLAG
   469 00005C49 A880                <1> 	test	al, 80h			; IF UIP BIT IS ON ( CANNOT READ TIME )
   470 00005C4B 7406                <1> 	jz	short UPD_90		; EXIT WITH CY= 0 IF CAN READ CLOCK NOW
   471 00005C4D FB                  <1> 	sti				; ALLOW INTERRUPTS WHILE WAITING
   472 00005C4E E2F1                <1> 	loop	UPD_10			; LOOP TILL READY OR TIMEOUT
   473 00005C50 31C0                <1> 	xor	eax, eax		; CLEAR RESULTS IF ERROR
   474                              <1> 		; xor ax, ax
   475 00005C52 F9                  <1> 	stc				; SET CARRY FOR ERROR
   476                              <1> UPD_90:
   477 00005C53 59                  <1> 	pop	ecx			; RESTORE CALLERS REGISTER
   478 00005C54 FA                  <1> 	cli				; INTERRUPTS OFF DURING SET
   479 00005C55 C3                  <1> 	retn				; RETURN WITH CY FLAG SET
   480                              <1> 
   481                              <1> 
   482                              <1> 	; 29/05/2016 - TRDOS 386 (TRDOS v2.0) 
   483                              <1> 	; 22/08/2014 (Retro UNIX 386 v1)
   484                              <1> 	; IBM PC/AT BIOS source code ----- 10/06/85 (test4.asm)
   485                              <1> 
   486                              <1> ;--- CMOS_READ -----------------------------------------------------------------
   487                              <1> ;		READ BYTE FROM CMOS_SYSTEM CLOCK CONFIGURATION TABLE	       :
   488                              <1> ;									       :
   489                              <1> ; INPUT: (AL)=	CMOS_TABLE ADDRESS TO BE READ				       :
   490                              <1> ;		BIT    7 = 0 FOR NMI ENABLED AND 1 FOR NMI DISABLED ON EXIT    :
   491                              <1> ;		BITS 6-0 = ADDRESS OF TABLE LOCATION TO READ		       :
   492                              <1> ;									       :
   493                              <1> ; OUTPUT: (AL)	VALUE AT LOCATION (AL) MOVED INTO (AL). IF BIT 7 OF (AL) WAS   :
   494                              <1> ;		ON THEN NMI LEFT DISABLED, DURING THE CMOS READ BOTH NMI AND   :
   495                              <1> ;		NORMAL INTERRUPTS ARE DISABLED TO PROTECT CMOS DATA INTEGRITY. :
   496                              <1> ;		THE CMOS ADDRESS REGISTER IS POINTED TO A DEFAULT VALUE AND    :
   497                              <1> ;		THE INTERRUPT FLAG RESTORED TO THE ENTRY STATE ON RETURN.      :
   498                              <1> ;		ONLY THE (AL) REGISTER AND THE NMI STATE IS CHANGED.	       :
   499                              <1> ;-------------------------------------------------------------------------------
   500                              <1> 
   501                              <1> CMOS_READ:
   502 00005C56 9C                  <1> 	pushf				; SAVE INTERRUPT ENABLE STATUS AND FLAGS
   503 00005C57 D0C0                <1> 	rol	al, 1			; MOVE NMI BIT TO LOW POSITION
   504 00005C59 F9                  <1> 	stc				; FORCE NMI BIT ON IN CARRY FLAG
   505 00005C5A D0D8                <1> 	rcr	al, 1			; HIGH BIT ON TO DISABLE NMI - OLD IN CY
   506 00005C5C FA                  <1> 	cli				; DISABLE INTERRUPTS
   507 00005C5D E670                <1> 	out	CMOS_PORT, al		; ADDRESS LOCATION AND DISABLE NMI
   508                              <1> 	; 29/05/2016
   509                              <1> 	;nop				; I/O DELAY
   510 00005C5F E6EB                <1> 	out	0ebh,al	; NEWIODELAY ; AWARD BIOS 1999, ATIME.ASM
   511                              <1> 	;
   512 00005C61 E471                <1> 	in	al, CMOS_DATA		; READ THE REQUESTED CMOS LOCATION
   513 00005C63 6650                <1> 	push	ax			; SAVE (AH) REGISTER VALUE AND CMOS BYTE
   514                              <1> 	; 15/03/2015 ; IBM PC/XT Model 286 BIOS source code 
   515                              <1> 		     ; ----- 10/06/85 (test4.asm)
   516 00005C65 B01E                <1> 	mov	al, CMOS_SHUT_DOWN*2 	; GET ADDRESS OF DEFAULT LOCATION
   517                              <1> 	;mov	al, CMOS_REG_D*2 	; GET ADDRESS OF DEFAULT LOCATION
   518 00005C67 D0D8                <1> 	rcr	al, 1			; PUT ORIGINAL NMI MASK BIT INTO ADDRESS
   519 00005C69 E670                <1> 	out	CMOS_PORT, al		; SET DEFAULT TO READ ONLY REGISTER
   520 00005C6B 6658                <1> 	pop	ax			; RESTORE (AH) AND (AL), CMOS BYTE
   521 00005C6D 9D                  <1> 	popf	
   522 00005C6E C3                  <1> 	retn				; RETURN WITH FLAGS RESTORED
   523                              <1> 
   524                              <1> ; 17/01/2016 (TRDOS 386 = TRDOS v2.0)
   525                              <1> 
   526                              <1> ;--- CMOS_WRITE ----------------------------------------------------------------
   527                              <1> ;	WRITE BYTE TO CMOS SYSTEM CLOCK CONFIGURATION TABLE		       :
   528                              <1> ;									       :
   529                              <1> ; INPUT: (AL)=	CMOS TABLE ADDRESS TO BE WRITTEN TO			       :
   530                              <1> ;		BIT    7 = 0 FOR NMI ENABLED AND 1 FOR NMI DISABLED ON EXIT    :
   531                              <1> ;		BITS 6-0 = ADDRESS OF TABLE LOCATION TO WRITE		       :
   532                              <1> ;	 (AH)=	NEW VALUE TO BE PLACED IN THE ADDRESSED TABLE LOCATION	       :
   533                              <1> ;									       :
   534                              <1> ; OUTPUT:	VALUE IN (AH) PLACED IN LOCATION (AL) WITH NMI LEFT DISABLED   :
   535                              <1> ;		IF BIT 7 OF (AL) IS ON, DURING THE CMOS UPDATE BOTH NMI AND    :
   536                              <1> ;		NORMAL INTERRUPTS ARE DISABLED TO PROTECT CMOS DATA INTEGRITY. :
   537                              <1> ;		THE CMOS ADDRESS REGISTER IS POINTED TO A DEFAULT VALUE AND    :
   538                              <1> ;		THE INTERRUPT FLAG RESTORED TO THE ENTRY STATE ON RETURN.      :
   539                              <1> ;		ONLY THE CMOS LOCATION AND THE NMI STATE IS CHANGED.	       :
   540                              <1> ;-------------------------------------------------------------------------------
   541                              <1> 
   542                              <1> CMOS_WRITE:				; WRITE (AH) TO LOCATION (AL)
   543 00005C6F 9C                  <1> 	pushf				; SAVE INTERRUPT ENABLE STATUS AND FLAGS
   544 00005C70 6650                <1> 	push	ax			; SAVE WORK REGISTER VALUES
   545 00005C72 D0C0                <1> 	rol	al, 1			; MOVE NMI BIT TO LOW POSITION
   546 00005C74 F9                  <1> 	stc				; FORCE NMI BIT ON IN CARRY FLAG
   547 00005C75 D0D8                <1> 	rcr	al, 1			; HIGH BIT ON TO DISABLE NMI - OLD IN CY
   548 00005C77 FA                  <1> 	cli				; DISABLE INTERRUPTS
   549 00005C78 E670                <1> 	out	CMOS_PORT, al		; ADDRESS LOCATION AND DISABLE NMI
   550 00005C7A 88E0                <1> 	mov	al, ah			; GET THE DATA BYTE TO WRITE
   551 00005C7C E671                <1> 	out	CMOS_DATA, al		; PLACE IN REQUESTED CMOS LOCATION
   552 00005C7E B01E                <1> 	mov	al, CMOS_SHUT_DOWN*2	; GET ADDRESS OF DEFAULT LOCATION
   553                              <1> 	;mov	al, CMOS_REG_D*2 	; GET ADDRESS OF DEFAULT LOCATION
   554 00005C80 D0D8                <1> 	rcr	al, 1			; PUT ORIGINAL NMI MASK BIT INTO ADDRESS
   555 00005C82 E670                <1> 	out	CMOS_PORT, al		; SET DEFAULT TO READ ONLY REGISTER
   556 00005C84 90                  <1> 	nop				; I/O DELAY
   557 00005C85 E471                <1> 	in	al, CMOS_DATA		; OPEN STANDBY LATCH
   558 00005C87 6658                <1> 	pop	ax			; RESTORE WORK REGISTERS
   559 00005C89 9D                  <1> 	popf
   560 00005C8A C3                  <1> 	retn
   561                              <1> 
   562                              <1> ; /// End Of TIMER FUNCTIONS ///
  2161                                  
  2162 00005C8B 90<rept>                Align 16
  2163                                  
  2164                                  gdt:	; Global Descriptor Table
  2165                                  	; (30/07/2015, conforming cs)
  2166                                  	; (26/03/2015)
  2167                                  	; (24/03/2015, tss)
  2168                                  	; (19/03/2015)
  2169                                  	; (29/12/2013)
  2170                                  	;
  2171 00005C90 0000000000000000        	dw 0, 0, 0, 0		; NULL descriptor
  2172                                  	; 18/08/2014
  2173                                  			; 8h kernel code segment, base = 00000000h		
  2174                                  	;dw 0FFFFh, 0, 9E00h, 00CFh	; KCODE  ; 30/12/2016	 
  2175 00005C98 FFFF0000009ACF00        	dw 0FFFFh, 0, 9A00h, 00CFh	; KCODE
  2176                                  			; 10h kernel data segment, base = 00000000h	
  2177 00005CA0 FFFF00000092CF00        	dw 0FFFFh, 0, 9200h, 00CFh	; KDATA
  2178                                  			; 1Bh user code segment, base address = 400000h ; CORE
  2179                                  	;dw 0FBFFh, 0, 0FE40h, 00CFh	; UCODE  ; 30/12/2016	
  2180 00005CA8 FFFB000040FACF00        	dw 0FBFFh, 0, 0FA40h, 00CFh	; UCODE 
  2181                                  			; 23h user data segment, base address = 400000h ; CORE
  2182 00005CB0 FFFB000040F2CF00        	dw 0FBFFh, 0, 0F240h, 00CFh	; UDATA
  2183                                  			; Task State Segment
  2184 00005CB8 6700                    	dw 0067h ; Limit = 103 ; (104-1, tss size = 104 byte, 
  2185                                  			       ;  no IO permission in ring 3)
  2186                                  gdt_tss0:
  2187 00005CBA 0000                    	dw 0  ; TSS base address, bits 0-15 
  2188                                  gdt_tss1:
  2189 00005CBC 00                      	db 0  ; TSS base address, bits 16-23 
  2190                                  	      		; 49h	
  2191 00005CBD E9                      	db 11101001b ; E9h => P=1/DPL=11/0/1/0/B/1 --> B = Task is busy (1)
  2192 00005CBE 00                      	db 0 ; G/0/0/AVL/LIMIT=0000 ; (Limit bits 16-19 = 0000) (G=0, 1 byte)
  2193                                  gdt_tss2:
  2194 00005CBF 00                      	db 0  ; TSS base address, bits 24-31 
  2195                                  
  2196                                  gdt_end:
  2197                                  	;; 9Eh = 1001 1110b (GDT byte 5) P=1/DPL=00/1/TYPE=1110, 
  2198                                  					;; Type= 1 (code)/C=1/R=1/A=0
  2199                                  		; P= Present, DPL=0=ring 0,  1= user (0= system)
  2200                                  		; 1= Code C= Conforming, R= Readable, A = Accessed
  2201                                  
  2202                                  	;; 9Ah = 1001 1010b (GDT byte 5) P=1/DPL=00/1/TYPE=1010, 
  2203                                  					;; Type= 1 (code)/C=0/R=1/A=0
  2204                                  		; P= Present, DPL=0=ring 0,  1= user (0= system)
  2205                                  		; 1= Code C= non-Conforming, R= Readable, A = Accessed
  2206                                  
  2207                                  	;; 92h = 1001 0010b (GDT byte 5) P=1/DPL=00/1/TYPE=1010, 
  2208                                  					;; Type= 0 (data)/E=0/W=1/A=0
  2209                                  		; P= Present, DPL=0=ring 0,  1= user (0= system)
  2210                                  		; 0= Data E= Expansion direction (1= down, 0= up)
  2211                                  		; W= Writeable, A= Accessed
  2212                                  
  2213                                  	;; FEh = 1111 1110b (GDT byte 5) P=1/DPL=11/1/TYPE=1110, 
  2214                                  					;; Type= 1 (code)/C=1/R=1/A=0
  2215                                  		; P= Present, DPL=3=ring 3,  1= user (0= system)
  2216                                  		; 1= Code C= Conforming, R= Readable, A = Accessed
  2217                                  	
  2218                                  	;; FAh = 1111 1010b (GDT byte 5) P=1/DPL=11/1/TYPE=1010, 
  2219                                  					;; Type= 1 (code)/C=0/R=1/A=0
  2220                                  		; P= Present, DPL=3=ring 3,  1= user (0= system)
  2221                                  		; 1= Code C= non-Conforming, R= Readable, A = Accessed
  2222                                  
  2223                                  	;; F2h = 1111 0010b (GDT byte 5) P=1/DPL=11/1/TYPE=0010, 
  2224                                  					;; Type= 0 (data)/E=0/W=1/A=0
  2225                                  		; P= Present, DPL=3=ring 3,  1= user (0= system)
  2226                                  		; 0= Data E= Expansion direction (1= down, 0= up)
  2227                                  	
  2228                                  	;; CFh = 1100 1111b (GDT byte 6) G=1/B=1/0/AVL=0, Limit=1111b (3)
  2229                                  
  2230                                  		;; Limit = FFFFFh (=> FFFFFh+1= 100000h) // bits 0-15, 48-51 //
  2231                                  		;	 = 100000h * 1000h (G=1) = 4GB
  2232                                  		;; Limit = FFBFFh (=> FFBFFh+1= FFC00h) // bits 0-15, 48-51 //
  2233                                  		;	 = FFC00h * 1000h (G=1) = 4GB - 4MB
  2234                                  		; G= Granularity (1= 4KB), B= Big (32 bit), 
  2235                                  		; AVL= Available to programmers	
  2236                                  
  2237                                  gdtd:
  2238 00005CC0 2F00                            dw gdt_end - gdt - 1    ; Limit (size)
  2239 00005CC2 [905C0000]                      dd gdt			; Address of the GDT
  2240                                  
  2241                                  	; 20/08/2014
  2242                                  idtd:
  2243 00005CC6 7F02                            dw idt_end - idt - 1    ; Limit (size)
  2244 00005CC8 [D8550100]                      dd idt			; Address of the IDT
  2245                                  
  2246                                  ; 20/02/2017
  2247                                  ;;; 11/03/2015
  2248                                  %include 'diskdata.s'	; DISK (BIOS) DATA (initialized)
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - diskdata.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 24/01/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; diskdata.inc (11/03/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - DISKDATA.INC
    20                              <1> ; Last Modification: 11/03/2015
    21                              <1> ;	(Initialized Disk Parameters Data section for 'DISKIO.INC') 
    22                              <1> ;
    23                              <1> 
    24                              <1> ;----------------------------------------
    25                              <1> ;	80286 INTERRUPT LOCATIONS	:
    26                              <1> ;	REFERENCED BY POST & BIOS	:
    27                              <1> ;----------------------------------------
    28                              <1> 
    29 00005CCC [2F5D0000]          <1> DISK_POINTER:	dd	MD_TBL6		; Pointer to Diskette Parameter Table
    30                              <1> 
    31                              <1> ; IBM PC-XT Model 286 source code ORGS.ASM (06/10/85) - 14/12/2014
    32                              <1> ;----------------------------------------------------------------
    33                              <1> ; DISK_BASE							:
    34                              <1> ;	THIS IS THE SET OF PARAMETERS REQUIRED FOR		:
    35                              <1> ;	DISKETTE OPERATION. THEY ARE POINTED AT BY THE		:
    36                              <1> ;	DATA VARIABLE @DISK_POINTER. TO MODIFY THE PARAMETERS,	:
    37                              <1> ;	BUILD ANOTHER PARAMETER BLOCK AND POINT AT IT		:
    38                              <1> ;----------------------------------------------------------------
    39                              <1> 
    40                              <1> ;DISK_BASE:	
    41                              <1> ;	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
    42                              <1> ;	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
    43                              <1> ;	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
    44                              <1> ;	DB	2		; 512 BYTES/SECTOR
    45                              <1> ;	;DB	15		; EOT (LAST SECTOR ON TRACK)
    46                              <1> ;	db	18		; (EOT for 1.44MB diskette)
    47                              <1> ;	DB	01BH		; GAP LENGTH
    48                              <1> ;	DB	0FFH		; DTL
    49                              <1> ;	;DB	054H		; GAP LENGTH FOR FORMAT
    50                              <1> ;	db	06ch		; (for 1.44MB dsikette)
    51                              <1> ;	DB	0F6H		; FILL BYTE FOR FORMAT
    52                              <1> ;	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
    53                              <1> ;	DB	8		; MOTOR START TIME (1/8 SECONDS)
    54                              <1> 
    55                              <1> ;----------------------------------------
    56                              <1> ;	ROM BIOS DATA AREAS		:
    57                              <1> ;----------------------------------------
    58                              <1> 
    59                              <1> ;DATA		SEGMENT AT 40H		; ADDRESS= 0040:0000
    60                              <1> 
    61                              <1> ;@EQUIP_FLAG	DW	?		; INSTALLED HARDWARE FLAGS
    62                              <1> 
    63                              <1> ;----------------------------------------
    64                              <1> ;	DISKETTE DATA AREAS		:
    65                              <1> ;----------------------------------------
    66                              <1> 
    67                              <1> ;@SEEK_STATUS	DB	?		; DRIVE RECALIBRATION STATUS
    68                              <1> ;					; BIT 3-0 = DRIVE 3-0 RECALIBRATION
    69                              <1> ;					; BEFORE NEXT SEEK IF BIT IS = 0
    70                              <1> ;@MOTOR_STATUS	DB	?		; MOTOR STATUS
    71                              <1> ;					; BIT 3-0 = DRIVE 3-0 CURRENTLY RUNNING
    72                              <1> ;					; BIT 7 = CURRENT OPERATION IS A WRITE
    73                              <1> ;@MOTOR_COUNT	DB	?		; TIME OUT COUNTER FOR MOTOR(S) TURN OFF
    74                              <1> ;@DSKETTE_STATUS DB	?		; RETURN CODE STATUS BYTE
    75                              <1> ;					; CMD_BLOCK  IN STACK FOR DISK OPERATION
    76                              <1> ;@NEC_STATUS	DB	7 DUP(?)	; STATUS BYTES FROM DISKETTE OPERATION
    77                              <1> 
    78                              <1> ;----------------------------------------
    79                              <1> ;	POST AND BIOS WORK DATA AREA	:
    80                              <1> ;----------------------------------------
    81                              <1> 
    82                              <1> ;@INTR_FLAG	DB	?		; FLAG INDICATING AN INTERRUPT HAPPENED
    83                              <1> 
    84                              <1> ;----------------------------------------
    85                              <1> ;	TIMER DATA AREA 		:
    86                              <1> ;----------------------------------------
    87                              <1> 
    88                              <1> ; 17/12/2014  (IRQ 0 - INT 08H)
    89                              <1> ;TIMER_LOW	equ	46Ch		; Timer ticks (counter)  @ 40h:006Ch
    90                              <1> ;TIMER_HIGH	equ	46Eh		; (18.2 timer ticks per second)
    91                              <1> ;TIMER_OFL	equ	470h		; Timer - 24 hours flag  @ 40h:0070h
    92                              <1> 
    93                              <1> ;----------------------------------------
    94                              <1> ;	ADDITIONAL MEDIA DATA		:
    95                              <1> ;----------------------------------------
    96                              <1> 
    97                              <1> ;@LASTRATE	DB	?		; LAST DISKETTE DATA RATE SELECTED
    98                              <1> ;@DSK_STATE	DB	?		; DRIVE 0 MEDIA STATE
    99                              <1> ;		DB	?		; DRIVE 1 MEDIA STATE
   100                              <1> ;		DB	?		; DRIVE 0 OPERATION START STATE
   101                              <1> ;		DB	?		; DRIVE 1 OPERATION START STATE
   102                              <1> ;@DSK_TRK	DB	?		; DRIVE 0 PRESENT CYLINDER
   103                              <1> ;		DB	?		; DRIVE 1 PRESENT CYLINDER
   104                              <1> 
   105                              <1> ;DATA		ENDS			; END OF BIOS DATA SEGMENT
   106                              <1> 
   107                              <1> ;--------------------------------------------------------
   108                              <1> ;	DRIVE TYPE TABLE				:
   109                              <1> ;--------------------------------------------------------
   110                              <1> 		; 16/02/2015 (unix386.s, 32 bit modifications)
   111                              <1> DR_TYPE:
   112 00005CD0 01                  <1> 		DB	01		;DRIVE TYPE, MEDIA TABLE
   113                              <1>                 ;DW      MD_TBL1
   114 00005CD1 [EE5C0000]          <1> 		dd	MD_TBL1
   115 00005CD5 82                  <1> 		DB	02+BIT7ON
   116                              <1> 		;DW      MD_TBL2
   117 00005CD6 [FB5C0000]          <1>                 dd      MD_TBL2
   118 00005CDA 02                  <1> DR_DEFAULT:	DB	02
   119                              <1>                 ;DW      MD_TBL3
   120 00005CDB [085D0000]          <1> 		dd      MD_TBL3
   121 00005CDF 03                  <1> 		DB	03
   122                              <1>                 ;DW      MD_TBL4
   123 00005CE0 [155D0000]          <1> 		dd      MD_TBL4
   124 00005CE4 84                  <1> 		DB	04+BIT7ON
   125                              <1>                 ;DW      MD_TBL5
   126 00005CE5 [225D0000]          <1> 		dd      MD_TBL5
   127 00005CE9 04                  <1> 		DB	04
   128                              <1>                 ;DW      MD_TBL6
   129 00005CEA [2F5D0000]          <1> 		dd      MD_TBL6
   130                              <1> DR_TYPE_E       equ $                   ; END OF TABLE
   131                              <1> ;DR_CNT		EQU	(DR_TYPE_E-DR_TYPE)/3
   132                              <1> DR_CNT		equ	(DR_TYPE_E-DR_TYPE)/5
   133                              <1> ;--------------------------------------------------------
   134                              <1> ;	MEDIA/DRIVE PARAMETER TABLES			:
   135                              <1> ;--------------------------------------------------------
   136                              <1> ;--------------------------------------------------------
   137                              <1> ;	360 KB MEDIA IN 360 KB DRIVE			:
   138                              <1> ;--------------------------------------------------------
   139                              <1> MD_TBL1:        
   140 00005CEE DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   141 00005CEF 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   142 00005CF0 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   143 00005CF1 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   144 00005CF2 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   145 00005CF3 2A                  <1> 	DB	02AH		; GAP LENGTH
   146 00005CF4 FF                  <1> 	DB	0FFH		; DTL
   147 00005CF5 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   148 00005CF6 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   149 00005CF7 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   150 00005CF8 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   151 00005CF9 27                  <1> 	DB	39		; MAX. TRACK NUMBER
   152 00005CFA 80                  <1> 	DB	RATE_250	; DATA TRANSFER RATE
   153                              <1> ;--------------------------------------------------------
   154                              <1> ;	360 KB MEDIA IN 1.2 MB DRIVE			:
   155                              <1> ;--------------------------------------------------------
   156                              <1> MD_TBL2:        
   157 00005CFB DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   158 00005CFC 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   159 00005CFD 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   160 00005CFE 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   161 00005CFF 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   162 00005D00 2A                  <1> 	DB	02AH		; GAP LENGTH
   163 00005D01 FF                  <1> 	DB	0FFH		; DTL
   164 00005D02 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   165 00005D03 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   166 00005D04 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   167 00005D05 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   168 00005D06 27                  <1> 	DB	39		; MAX. TRACK NUMBER
   169 00005D07 40                  <1> 	DB	RATE_300	; DATA TRANSFER RATE
   170                              <1> ;--------------------------------------------------------
   171                              <1> ;	1.2 MB MEDIA IN 1.2 MB DRIVE			:
   172                              <1> ;--------------------------------------------------------
   173                              <1> MD_TBL3:
   174 00005D08 DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   175 00005D09 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   176 00005D0A 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   177 00005D0B 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   178 00005D0C 0F                  <1> 	DB	15		; EOT (LAST SECTOR ON TRACK)
   179 00005D0D 1B                  <1> 	DB	01BH		; GAP LENGTH
   180 00005D0E FF                  <1> 	DB	0FFH		; DTL
   181 00005D0F 54                  <1> 	DB	054H		; GAP LENGTH FOR FORMAT
   182 00005D10 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   183 00005D11 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   184 00005D12 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   185 00005D13 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   186 00005D14 00                  <1> 	DB	RATE_500	; DATA TRANSFER RATE
   187                              <1> ;--------------------------------------------------------
   188                              <1> ;	720 KB MEDIA IN 720 KB DRIVE			:
   189                              <1> ;--------------------------------------------------------
   190                              <1> MD_TBL4:
   191 00005D15 DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   192 00005D16 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   193 00005D17 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   194 00005D18 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   195 00005D19 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   196 00005D1A 2A                  <1> 	DB	02AH		; GAP LENGTH
   197 00005D1B FF                  <1> 	DB	0FFH		; DTL
   198 00005D1C 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   199 00005D1D F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   200 00005D1E 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   201 00005D1F 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   202 00005D20 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   203 00005D21 80                  <1> 	DB	RATE_250	; DATA TRANSFER RATE
   204                              <1> ;--------------------------------------------------------
   205                              <1> ;	720 KB MEDIA IN 1.44 MB DRIVE			:
   206                              <1> ;--------------------------------------------------------
   207                              <1> MD_TBL5:
   208 00005D22 DF                  <1> 	DB	11011111B	; SRT=D, HD UNLOAD=0F - 1ST SPECIFY BYTE
   209 00005D23 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   210 00005D24 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   211 00005D25 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   212 00005D26 09                  <1> 	DB	09		; EOT (LAST SECTOR ON TRACK)
   213 00005D27 2A                  <1> 	DB	02AH		; GAP LENGTH
   214 00005D28 FF                  <1> 	DB	0FFH		; DTL
   215 00005D29 50                  <1> 	DB	050H		; GAP LENGTH FOR FORMAT
   216 00005D2A F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   217 00005D2B 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   218 00005D2C 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   219 00005D2D 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   220 00005D2E 80                  <1> 	DB	RATE_250	; DATA TRANSFER RATE
   221                              <1> ;--------------------------------------------------------
   222                              <1> ;	1.44 MB MEDIA IN 1.44 MB DRIVE			:
   223                              <1> ;--------------------------------------------------------
   224                              <1> MD_TBL6:
   225 00005D2F AF                  <1> 	DB	10101111B	; SRT=A, HD UNLOAD=0F - 1ST SPECIFY BYTE
   226 00005D30 02                  <1> 	DB	2		; HD LOAD=1, MODE=DMA - 2ND SPECIFY BYTE
   227 00005D31 25                  <1> 	DB	MOTOR_WAIT	; WAIT TIME AFTER OPERATION TILL MOTOR OFF
   228 00005D32 02                  <1> 	DB	2		; 512 BYTES/SECTOR
   229 00005D33 12                  <1> 	DB	18		; EOT (LAST SECTOR ON TRACK)
   230 00005D34 1B                  <1> 	DB	01BH		; GAP LENGTH
   231 00005D35 FF                  <1> 	DB	0FFH		; DTL
   232 00005D36 6C                  <1> 	DB	06CH		; GAP LENGTH FOR FORMAT
   233 00005D37 F6                  <1> 	DB	0F6H		; FILL BYTE FOR FORMAT
   234 00005D38 0F                  <1> 	DB	15		; HEAD SETTLE TIME (MILLISECONDS)
   235 00005D39 08                  <1> 	DB	8		; MOTOR START TIME (1/8 SECONDS)
   236 00005D3A 4F                  <1> 	DB	79		; MAX. TRACK NUMBER
   237 00005D3B 00                  <1> 	DB	RATE_500	; DATA TRANSFER RATE
   238                              <1> 
   239                              <1> 
   240                              <1> ; << diskette.inc >>
   241                              <1> ; +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
   242                              <1> ;
   243                              <1> ;----------------------------------------
   244                              <1> ;	ROM BIOS DATA AREAS		:
   245                              <1> ;----------------------------------------
   246                              <1> 
   247                              <1> ;DATA		SEGMENT AT 40H		; ADDRESS= 0040:0000
   248                              <1> 
   249                              <1> ;----------------------------------------
   250                              <1> ;	FIXED DISK DATA AREAS		:
   251                              <1> ;----------------------------------------
   252                              <1> 
   253                              <1> ;DISK_STATUS1:	DB	0		; FIXED DISK STATUS
   254                              <1> ;HF_NUM:		DB	0		; COUNT OF FIXED DISK DRIVES
   255                              <1> ;CONTROL_BYTE:	DB	0		; HEAD CONTROL BYTE
   256                              <1> ;@PORT_OFF	DB	?		;  RESERVED (PORT OFFSET)
   257                              <1> 
   258                              <1> ;----------------------------------------
   259                              <1> ;	ADDITIONAL MEDIA DATA		:
   260                              <1> ;----------------------------------------
   261                              <1> 
   262                              <1> ;@LASTRATE	DB	?		; LAST DISKETTE DATA RATE SELECTED
   263                              <1> ;HF_STATUS	DB	0		; STATUS REGISTER
   264                              <1> ;HF_ERROR	DB	0		; ERROR REGISTER
   265                              <1> ;HF_INT_FLAG	DB	0		; FIXED DISK INTERRUPT FLAG
   266                              <1> ;HF_CNTRL	DB	0		; COMBO FIXED DISK/DISKETTE CARD BIT 0=1
   267                              <1> ;@DSK_STATE	DB	?		; DRIVE 0 MEDIA STATE
   268                              <1> ;		DB	?		; DRIVE 1 MEDIA STATE
   269                              <1> ;		DB	?		; DRIVE 0 OPERATION START STATE
   270                              <1> ;		DB	?		; DRIVE 1 OPERATION START STATE
   271                              <1> ;@DSK_TRK	DB	?		; DRIVE 0 PRESENT CYLINDER
   272                              <1> ;		DB	?		; DRIVE 1 PRESENT CYLINDER
   273                              <1> 
   274                              <1> ;DATA		ENDS			; END OF BIOS DATA SEGMENT
   275                              <1> ;
   276                              <1> ; +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
   277                              <1> 
   278                              <1> ERR_TBL:
   279 00005D3C E0                  <1> 	db	NO_ERR
   280 00005D3D 024001BB            <1> 	db	BAD_ADDR_MARK,BAD_SEEK,BAD_CMD,UNDEF_ERR
   281 00005D41 04BB100A            <1> 	db	RECORD_NOT_FND,UNDEF_ERR,BAD_ECC,BAD_SECTOR
   282                              <1> 
   283                              <1> ; 17/12/2014 (mov ax, [cfd])
   284                              <1> ; 11/12/2014
   285 00005D45 00                  <1> cfd:		db 0			; current floppy drive (for GET_PARM)
   286                              <1> ; 17/12/2014				; instead of 'DISK_POINTER'
   287 00005D46 01                  <1> pfd:		db 1			; previous floppy drive (for GET_PARM)
   288                              <1> 					; (initial value of 'pfd 
   289                              <1> 					; must be different then 'cfd' value
   290                              <1> 					; to force updating/initializing
   291                              <1> 					; current drive parameters) 
   292 00005D47 90                  <1> align 2
   293                              <1> 
   294 00005D48 F001                <1> HF_PORT:	dw 	1F0h  ; Default = 1F0h
   295                              <1> 			      ; (170h)
   296 00005D4A F603                <1> HF_REG_PORT:	dw	3F6h  ; HF_PORT + 206h
   297                              <1> 
   298                              <1> ; 05/01/2015 
   299 00005D4C 00                  <1> hf_m_s:         db      0     ; (0 = Master, 1 = Slave)
   300                              <1> 
   301                              <1> ; *****************************************************************************
  2249                                  
  2250 00005D4D 90                      Align 2
  2251                                  
  2252                                  ; 04/11/2014 (Retro UNIX 386 v1)
  2253 00005D4E 0000                    mem_1m_1k:   dw 0  ; Number of contiguous KB between
  2254                                                       ; 1 and 16 MB, max. 3C00h = 15 MB.
  2255 00005D50 0000                    mem_16m_64k: dw 0  ; Number of contiguous 64 KB blocks
  2256                                  		   ; between 16 MB and 4 GB.
  2257                                  
  2258                                  ; 12/11/2014 (Retro UNIX 386 v1)
  2259 00005D52 00                      boot_drv:    db 0 ; boot drive number (physical)
  2260                                  ; 24/11/2014
  2261 00005D53 00                      drv:	     db 0 
  2262 00005D54 00                      last_drv:    db 0 ; last hdd
  2263 00005D55 00                      hdc:         db 0  ; number of hard disk drives
  2264                                  		     ; (present/detected)
  2265                                  
  2266                                  ; 24/11/2014 (Retro UNIX 386 v1)
  2267                                  ; Physical drive type & flags
  2268 00005D56 00                      fd0_type:    db 0  ; floppy drive type
  2269 00005D57 00                      fd1_type:    db 0  ; 4 = 1.44 Mb, 80 track, 3.5" (18 spt)
  2270                                  		     ; 6 = 2.88 Mb, 80 track, 3.5" (36 spt)
  2271                                  		     ; 3 = 720 Kb, 80 track, 3.5" (9 spt)
  2272                                  		     ; 2 = 1.2 Mb, 80 track, 5.25" (15 spt)
  2273                                  		     ; 1 = 360 Kb, 40 track, 5.25" (9 spt)		
  2274 00005D58 00                      hd0_type:    db 0  ; EDD status for hd0 (bit 7 = present flag)
  2275 00005D59 00                      hd1_type:    db 0  ; EDD status for hd1 (bit 7 = present flag)
  2276 00005D5A 00                      hd2_type:    db 0  ; EDD status for hd2 (bit 7 = present flag)
  2277 00005D5B 00                      hd3_type:    db 0  ; EDD status for hd3 (bit 7 = present flag)
  2278                                  		     ; bit 0 - Fixed disk access subset supported
  2279                                  		     ; bit 1 - Drive locking and ejecting
  2280                                  		     ; bit 2 - Enhanced disk drive support
  2281                                  		     ; bit 3 = Reserved (64 bit EDD support)
  2282                                  		     ; (If bit 0 is '1' Retro UNIX 386 v1
  2283                                  		     ; will interpret it as 'LBA ready'!)
  2284                                  
  2285                                  ; 11/03/2015 - 10/07/2015
  2286 00005D5C 000000000000000000-     drv.cylinders: dw 0,0,0,0,0,0,0
  2286 00005D65 0000000000         
  2287 00005D6A 000000000000000000-     drv.heads:     dw 0,0,0,0,0,0,0
  2287 00005D73 0000000000         
  2288 00005D78 000000000000000000-     drv.spt:       dw 0,0,0,0,0,0,0
  2288 00005D81 0000000000         
  2289 00005D86 000000000000000000-     drv.size:      dd 0,0,0,0,0,0,0
  2289 00005D8F 000000000000000000-
  2289 00005D98 000000000000000000-
  2289 00005DA1 00                 
  2290 00005DA2 00000000000000          drv.status:    db 0,0,0,0,0,0,0
  2291 00005DA9 00000000000000          drv.error:     db 0,0,0,0,0,0,0	
  2292                                  
  2293                                  Align 2
  2294                                  
  2295                                  ;;; 11/03/2015
  2296                                  %include 'kybdata.s'	; KEYBOARD (BIOS) DATA
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - kybdata.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 17/01/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 17/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; kybdata.inc (11/03/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - KYBDATA.INC
    20                              <1> ; Last Modification: 11/03/2015
    21                              <1> ;		 (Data Section for 'KEYBOARD.INC')	
    22                              <1> ;
    23                              <1> ; ///////// KEYBOARD DATA ///////////////
    24                              <1> 
    25                              <1> ; 05/12/2014
    26                              <1> ; 04/12/2014 (derived from pc-xt-286 bios source code -1986-) 
    27                              <1> ; 03/06/86  KEYBOARD BIOS
    28                              <1> 
    29                              <1> ;---------------------------------------------------------------------------------
    30                              <1> ;	KEY IDENTIFICATION SCAN TABLES
    31                              <1> ;---------------------------------------------------------------------------------
    32                              <1> 
    33                              <1> ;-----	TABLES FOR ALT CASE ------------
    34                              <1> ;-----	ALT-INPUT-TABLE 
    35 00005DB0 524F50514B          <1> K30:	db	82,79,80,81,75
    36 00005DB5 4C4D474849          <1> 	db	76,77,71,72,73		; 10 NUMBER ON KEYPAD
    37                              <1> ;-----	SUPER-SHIFT-TABLE 
    38 00005DBA 101112131415        <1> 	db	16,17,18,19,20,21	; A-Z TYPEWRITER CHARS
    39 00005DC0 161718191E1F        <1> 	db	22,23,24,25,30,31
    40 00005DC6 202122232425        <1> 	db	32,33,34,35,36,37
    41 00005DCC 262C2D2E2F30        <1> 	db	38,44,45,46,47,48
    42 00005DD2 3132                <1> 	db	49,50
    43                              <1> 
    44                              <1> ;-----	TABLE OF SHIFT KEYS AND MASK VALUES
    45                              <1> ;-----	KEY_TABLE 
    46 00005DD4 52                  <1> _K6:    db      INS_KEY                 ; INSERT KEY
    47 00005DD5 3A4546381D          <1> 	db	CAPS_KEY,NUM_KEY,SCROLL_KEY,ALT_KEY,CTL_KEY
    48 00005DDA 2A36                <1>         db      LEFT_KEY,RIGHT_KEY
    49                              <1> _K6L    equ     $-_K6
    50                              <1> 
    51                              <1> ;-----	MASK_TABLE
    52 00005DDC 80                  <1> _K7:    db      INS_SHIFT               ; INSERT MODE SHIFT
    53 00005DDD 4020100804          <1> 	db	CAPS_SHIFT,NUM_SHIFT,SCROLL_SHIFT,ALT_SHIFT,CTL_SHIFT
    54 00005DE2 0201                <1> 	db	LEFT_SHIFT,RIGHT_SHIFT
    55                              <1> 
    56                              <1> ;-----	TABLES FOR CTRL CASE		;---- CHARACTERS ------
    57 00005DE4 1BFF00FFFFFF        <1> _K8:	db	27,-1,0,-1,-1,-1	; Esc, 1, 2, 3, 4, 5
    58 00005DEA 1EFFFFFFFF1F        <1> 	db 	30,-1,-1,-1,-1,31	; 6, 7, 8, 9, 0, -
    59 00005DF0 FF7FFF111705        <1> 	db	-1,127,-1,17,23,5	; =, Bksp, Tab, Q, W, E
    60 00005DF6 12141915090F        <1> 	db	18,20,25,21,9,15	; R, T, Y, U, I, O
    61 00005DFC 101B1D0AFF01        <1> 	db	16,27,29,10,-1,1	; P, [, ], Enter, Ctrl, A
    62 00005E02 13040607080A        <1> 	db	19,4,6,7,8,10		; S, D, F, G, H, J
    63 00005E08 0B0CFFFFFFFF        <1> 	db	11,12,-1,-1,-1,-1	; K, L, :, ', `, LShift
    64 00005E0E 1C1A18031602        <1> 	db	28,26,24,3,22,2		; Bkslash, Z, X, C, V, B
    65 00005E14 0E0DFFFFFFFF        <1> 	db	14,13,-1,-1,-1,-1	; N, M, ,, ., /, RShift
    66 00005E1A 96FF20FF            <1> 	db	150,-1,' ',-1		; *, ALT, Spc, CL
    67                              <1> 	;				;----- FUNCTIONS ------		
    68 00005E1E 5E5F60616263        <1> 	db 	94,95,96,97,98,99	; F1 - F6
    69 00005E24 64656667FFFF        <1> 	db	100,101,102,103,-1,-1	; F7 - F10, NL, SL
    70 00005E2A 778D848E738F        <1> 	db	119,141,132,142,115,143	; Home, Up, PgUp, -, Left, Pad5
    71 00005E30 749075917692        <1> 	db 	116,144,117,145,118,146 ; Right, +, End, Down, PgDn, Ins
    72 00005E36 93FFFFFF898A        <1> 	db	147,-1,-1,-1,137,138	; Del, SysReq, Undef, WT, F11, F12
    73                              <1> 
    74                              <1> ;-----	TABLES FOR LOWER CASE ----------
    75 00005E3C 1B3132333435363738- <1> K10:	db 	27,'1234567890-=',8,9
    75 00005E45 39302D3D0809        <1>
    76 00005E4B 71776572747975696F- <1> 	db 	'qwertyuiop[]',13,-1,'asdfghjkl;',39
    76 00005E54 705B5D0DFF61736466- <1>
    76 00005E5D 67686A6B6C3B27      <1>
    77 00005E64 60FF5C7A786376626E- <1> 	db	96,-1,92,'zxcvbnm,./',-1,'*',-1,' ',-1
    77 00005E6D 6D2C2E2FFF2AFF20FF  <1>
    78                              <1> ;-----	LC TABLE SCAN
    79 00005E76 3B3C3D3E3F          <1> 	db	59,60,61,62,63		; BASE STATE OF F1 - F10
    80 00005E7B 4041424344          <1> 	db	64,65,66,67,68
    81 00005E80 FFFF                <1> 	db	-1,-1			; NL, SL
    82                              <1> 
    83                              <1> ;-----	KEYPAD TABLE
    84 00005E82 474849FF4BFF        <1> K15:	db	71,72,73,-1,75,-1	; BASE STATE OF KEYPAD KEYS
    85 00005E88 4DFF4F50515253      <1> 	db	77,-1,79,80,81,82,83
    86 00005E8F FFFF5C8586          <1> 	db	-1,-1,92,133,134	; SysRq, Undef, WT, F11, F12
    87                              <1> 
    88                              <1> ;-----	TABLES FOR UPPER CASE ----------
    89 00005E94 1B21402324255E262A- <1> K11:	db 	27,'!@#$%',94,'&*()_+',8,0
    89 00005E9D 28295F2B0800        <1>
    90 00005EA3 51574552545955494F- <1> 	db 	'QWERTYUIOP{}',13,-1,'ASDFGHJKL:"'
    90 00005EAC 507B7D0DFF41534446- <1>
    90 00005EB5 47484A4B4C3A22      <1>
    91 00005EBC 7EFF7C5A584356424E- <1> 	db	126,-1,'|ZXCVBNM<>?',-1,'*',-1,' ',-1
    91 00005EC5 4D3C3E3FFF2AFF20FF  <1>
    92                              <1> ;-----	UC TABLE SCAN
    93 00005ECE 5455565758          <1> K12:	db	84,85,86,87,88		; SHIFTED STATE OF F1 - F10
    94 00005ED3 595A5B5C5D          <1> 	db	89,90,91,92,93
    95 00005ED8 FFFF                <1> 	db	-1,-1			; NL, SL
    96                              <1> 
    97                              <1> ;-----	NUM STATE TABLE
    98 00005EDA 3738392D3435362B31- <1> K14:	db 	'789-456+1230.'		; NUMLOCK STATE OF KEYPAD KEYS
    98 00005EE3 3233302E            <1>
    99                              <1> 	;
   100 00005EE7 FFFF7C8788          <1> 	db	-1,-1,124,135,136	; SysRq, Undef, WT, F11, F12
   101                              <1> 
   102                              <1> ; 26/08/2014
   103                              <1> ; Retro UNIX 8086 v1 - UNIX.ASM (03/03/2014)
   104                              <1> ; Derived from IBM "pc-at" 
   105                              <1> ; rombios source code (06/10/1985)
   106                              <1> ; 'dseg.inc'
   107                              <1> 
   108                              <1> ;---------------------------------------;
   109                              <1> ;	SYSTEM DATA AREA		;
   110                              <1> ;----------------------------------------
   111 00005EEC 00                  <1> BIOS_BREAK	db	0		; BIT 7=1 IF BREAK KEY HAS BEEN PRESSED
   112                              <1> 
   113                              <1> ;----------------------------------------
   114                              <1> ;	KEYBOARD DATA AREAS		;
   115                              <1> ;----------------------------------------
   116                              <1> 
   117 00005EED 00                  <1> KB_FLAG		db	0		; KEYBOARD SHIFT STATE AND STATUS FLAGS
   118 00005EEE 00                  <1> KB_FLAG_1	db	0		; SECOND BYTE OF KEYBOARD STATUS
   119 00005EEF 00                  <1> KB_FLAG_2	db	0		; KEYBOARD LED FLAGS
   120 00005EF0 00                  <1> KB_FLAG_3	db	0		; KEYBOARD MODE STATE AND TYPE FLAGS
   121 00005EF1 00                  <1> ALT_INPUT	db	0		; STORAGE FOR ALTERNATE KEY PAD ENTRY
   122 00005EF2 [025F0000]          <1> BUFFER_START	dd	KB_BUFFER 	; OFFSET OF KEYBOARD BUFFER START
   123 00005EF6 [225F0000]          <1> BUFFER_END	dd	KB_BUFFER + 32	; OFFSET OF END OF BUFFER
   124 00005EFA [025F0000]          <1> BUFFER_HEAD	dd	KB_BUFFER 	; POINTER TO HEAD OF KEYBOARD BUFFER
   125 00005EFE [025F0000]          <1> BUFFER_TAIL	dd	KB_BUFFER 	; POINTER TO TAIL OF KEYBOARD BUFFER
   126                              <1> ; ------	HEAD = TAIL	INDICATES THAT THE BUFFER IS EMPTY
   127 00005F02 0000<rept>          <1> KB_BUFFER	times	16 dw 0		; ROOM FOR 16 SCAN CODE ENTRIES
   128                              <1> 
   129                              <1> ; /// End Of KEYBOARD DATA ///
  2297                                  %include 'vidata.s'	; VIDEO (BIOS) DATA
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - vidata.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 31/07/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 16/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; vidata.inc (11/03/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-AT' BIOS source code (1985) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - VIDATA.S
    20                              <1> ; Last Modification: 11/03/2015
    21                              <1> ;		    (Data section for 'VIDEO.INC')	
    22                              <1> ;
    23                              <1> ; ///////// VIDEO DATA ///////////////
    24                              <1> 
    25                              <1> ;----------------------------------------
    26                              <1> ;	VIDEO DISPLAY DATA AREA		;
    27                              <1> ;----------------------------------------
    28 00005F22 03                  <1> CRT_MODE:	db	3	; CURRENT DISPLAY MODE (TYPE)
    29 00005F23 29                  <1> CRT_MODE_SET:	db	29h	; CURRENT SETTING OF THE 3X8 REGISTER
    30                              <1> 				; (29h default setting for video mode 3)
    31                              <1> 				; Mode Select register Bits
    32                              <1> 				;   BIT 0 - 80x25 (1), 40x25 (0)
    33                              <1> 				;   BIT 1 - ALPHA (0), 320x200 GRAPHICS (1)
    34                              <1> 				;   BIT 2 - COLOR (0), BW (1)
    35                              <1> 				;   BIT 3 - Video Sig. ENABLE (1), DISABLE (0)
    36                              <1> 				;   BIT 4 - 640x200 B&W Graphics Mode (1)
    37                              <1> 				;   BIT 5 - ALPHA mode BLINKING (1)
    38                              <1> 				;   BIT 6, 7 - Not Used
    39                              <1> 
    40                              <1> ; Mode 0 - 2Ch = 101100b	; 40x25 text, 16 gray colors
    41                              <1> ; Mode 1 - 28h = 101000b	; 40x25 text, 16 fore colors, 8 back colors
    42                              <1> ; Mode 2 - 2Dh = 101101b	; 80x25 text, 16 gray colors	
    43                              <1> ; Mode 3 - 29h = 101001b	; 80x25 text, 16 fore color, 8 back color
    44                              <1> ; Mode 4 - 2Ah = 101010b	; 320x200 graphics, 4 colors
    45                              <1> ; Mode 5 - 2Eh = 101110b	; 320x200 graphics, 4 gray colors
    46                              <1> ; Mode 6 - 1Eh = 011110b	; 640x200 graphics, 2 colors
    47                              <1> ; Mode 7 - 29h = 101001b	; 80x25 text, black & white colors
    48                              <1> ; Mode & 37h = Video signal OFF
    49                              <1> 
    50                              <1> ; 24/06/2016
    51 00005F24 50                  <1> CRT_COLS:	db	80	; Number of columns
    52                              <1> 
    53                              <1> ; 01/07/2016
    54 00005F25 00                  <1> CRT_PALETTE:	db 	0	; Current palette setting
    55                              <1> 
    56                              <1> ; 03/07/2016
    57 00005F26 10                  <1> CHAR_HEIGHT:	db	16	; Default character height
    58 00005F27 60                  <1> VGA_VIDEO_CTL:	db	60h	; ROM BIOS DATA AREA Offset 87h
    59 00005F28 F9                  <1> VGA_SWITCHES:	db 	0F9h	; Feature Bit Switches (the basic screen)
    60 00005F29 51                  <1> VGA_MODESET_CTL: db	051h	; Basic mode set options (VGA video flags)
    61                              <1> 				; ROM BIOS DATA AREA Offset 89h
    62                              <1> 				; Bit 7, 4 : Mode
    63                              <1> 				;	  01 : 400-line mode
    64                              <1> 				; Bit 6	: Display switch enabled =  1			
    65                              <1> 				; Bit 5	: Reserved  = 0
    66                              <1> 				; Bit 3	: Default palette loading 
    67                              <1> 				;	  disabled = 0
    68                              <1> 				; Bit 2 : Color monitor = 0
    69                              <1> 				; Bit 1 = Gray scale summing 
    70                              <1> 				;	  disabled = 0
    71                              <1> 				; Bit 0 = VGA active = 1
    72 00005F2A 19                  <1> VGA_ROWS:	db	25
    73                              <1> 
    74                              <1> ; 16/01/2016
    75                              <1> chr_attrib:  ; Character color/attributes for viode pages (0 to 7)
    76 00005F2B 0707070707070707    <1> 	db	07h, 07h, 07h, 07h, 07h, 07h, 07h, 07h
    77                              <1> ; 30/01/2016
    78                              <1> vmode:
    79 00005F33 0303030303030303    <1> 	db	3,3,3,3,3,3,3,3 ; video modes for pseudo screens 
    80                              <1> 
    81                              <1> CURSOR_MODE: ; cursor start (ch) = 14, cursor end (cl) = 15
    82 00005F3B 0F0E                <1> 	db	15, 14 ; 07/07/2016 - TRDOS 386 (TRDOS v2.0)
    83                              <1> 
    84                              <1> ;align 4
    85                              <1> ;VGA_BASE: ; 26/07/2016
    86                              <1> ;	dd	 0B8000h  ; (Mode < 0Dh) or 0A0000h (mode >= 0Dh)
    87                              <1> 
    88 00005F3D 90                  <1> align 2
    89                              <1> 
    90                              <1> vga_modes:
    91                              <1> 	; 25/07/2016
    92                              <1> 	; 09/07/2016
    93                              <1> 	; 03/07/2016
    94                              <1> 	; valid (implemented) video modes (>7, extension to IBM PC CGA modes)
    95 00005F3E 0302010007040506    <1> 	db 	03h, 02h, 01h, 00h, 07h, 04h, 05h, 06h
    96                              <1> vga_g_modes: ; 31/07/2016
    97 00005F46 13F0126A0D0E1011    <1> 	db	13h, 0F0h, 12h, 6Ah, 0Dh, 0Eh, 10h, 11h
    98                              <1> vga_mode_count equ $ - vga_modes
    99                              <1> vga_g_mode_count equ $ - vga_g_modes
   100                              <1> 
   101                              <1> vga_mode_tbl_ptr:
   102                              <1> 	; 25/07/2016
   103 00005F4E [AE5F0000]          <1> 	dd	vga_mode_03h
   104 00005F52 [AE5F0000]          <1> 	dd	vga_mode_03h ; mode 02h -> mode 03h 
   105 00005F56 [EE5F0000]          <1> 	dd	vga_mode_01h
   106 00005F5A [EE5F0000]          <1> 	dd	vga_mode_01h ; mode 00h -> mode 01h
   107                              <1> 	;dd	vga_mode_07h
   108 00005F5E [AE5F0000]          <1> 	dd	vga_mode_03h ; mode 07h -> mode 03h
   109 00005F62 [2E600000]          <1> 	dd	vga_mode_04h
   110 00005F66 [2E600000]          <1> 	dd	vga_mode_04h ; mode 05h -> mode 04h	
   111 00005F6A [6E600000]          <1> 	dd	vga_mode_06h
   112 00005F6E [AE600000]          <1> 	dd	vga_mode_13h
   113 00005F72 [EE600000]          <1> 	dd	vga_mode_F0h
   114 00005F76 [2E610000]          <1> 	dd	vga_mode_12h
   115 00005F7A [6E610000]          <1> 	dd	vga_mode_6Ah
   116 00005F7E [AE610000]          <1> 	dd	vga_mode_0Dh
   117 00005F82 [EE610000]          <1> 	dd	vga_mode_0Eh
   118 00005F86 [2E620000]          <1> 	dd	vga_mode_10h
   119 00005F8A [6E620000]          <1> 	dd	vga_mode_11h	
   120                              <1> 
   121                              <1> vga_memmodel: 
   122                              <1> 	; 25/07/2016
   123                              <1> 	; 07/07/2016
   124                              <1> 	CTEXT	equ 0
   125                              <1> 	;MTEXT	equ 1
   126                              <1> 	MTEXT	equ 0 ; mode 07h -> mode 03h
   127                              <1> 	CGA	equ 2
   128                              <1> 	LINEAR8 equ 5
   129                              <1> 	PLANAR4	equ 4
   130                              <1> 	PLANAR1	equ 3
   131 00005F8E 0000000000020202    <1> 	db	CTEXT, CTEXT, CTEXT, CTEXT, MTEXT, CGA, CGA, CGA
   132                              <1> vga_g_memmodel: ; 31/07/2016
   133 00005F96 0504040404040403    <1> 	db	LINEAR8, PLANAR4, PLANAR4, PLANAR4, PLANAR4, PLANAR4, PLANAR4, PLANAR1
   134                              <1> ;vga_pixbits:
   135                              <1> ;	; 25/07/2016
   136                              <1> ;	; 08/07/2016
   137                              <1> ;	db 	4, 4, 4, 4, 4, 2, 2, 1, 8, 4, 4, 4, 4, 4, 4, 1
   138                              <1> vga_dac_s:
   139 00005F9E 020202020001010103- <1> 	db	2, 2, 2, 2, 0, 1, 1, 1, 3, 3, 2, 2, 1, 1, 2, 2
   139 00005FA7 03020201010202      <1>
   140                              <1> 
   141                              <1> vga_params:
   142                              <1> 	; 25/07/2016 
   143                              <1> 	; 19/07/2016
   144                              <1> 	; 03/07/2016
   145                              <1> 	; derived from 'Plex86/Bochs VGABios' source code
   146                              <1> 	; vgabios-0.7a (2011)
   147                              <1> 	; by the LGPL VGABios Developers Team (2001-2008)
   148                              <1> 	; 'vgatables.h'
   149                              <1> 	; Oracle VirtualBox 5.0.24 VGABios Source Code
   150                              <1> 	; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
   151                              <1> 	;
   152                              <1> vga_mode_03h:  ; mode 03h, 80*25 text, CGA colors
   153 00005FAE 5018100010          <1>  	db	80, 24, 16, 00h, 10h ; tw, th-1, ch, slength (5)
   154 00005FB3 00030002            <1>  	db	00h, 03h, 00h, 02h ; sequ regs (4)
   155 00005FB7 67                  <1>  	db	67h	; misc reg (1)
   156 00005FB8 5F4F50825581BF1F    <1>  	db	5Fh, 4Fh, 50h, 82h, 55h, 81h, 0BFh, 1Fh
   157 00005FC0 004F                <1>  	db	00h, 4Fh
   158                              <1> vga_p_cm_pos equ $ - vga_mode_03h
   159 00005FC2 0D0E00000000        <1> 	db	0Dh, 0Eh, 00h, 00h, 00h, 00h
   160 00005FC8 9C8E8F281F96B9A3    <1>  	db	9Ch, 8Eh, 8Fh, 28h, 1Fh, 96h, 0B9h, 0A3h
   161 00005FD0 FF                  <1> 	db	0FFh	; crtc_regs (25)
   162 00005FD1 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   163 00005FD9 38393A3B3C3D3E3F    <1>  	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   164 00005FE1 0C000F08            <1>  	db	0Ch, 00h, 0Fh, 08h  ; actl regs (20)
   165 00005FE5 0000000000100E0FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 10h, 0Eh, 0Fh, 0FFh ; grdc regs (9)
   166                              <1> vga_mode_01h:	; mode 01h, 40*25 text, CGA colors
   167 00005FEE 2818100008          <1> 	db	40, 24, 16, 00h, 08h ; tw, th-1, ch, slength
   168 00005FF3 08030002            <1> 	db	08h, 03h, 00h, 02h  ; sequ regs
   169 00005FF7 67                  <1> 	db	67h	; misc reg
   170 00005FF8 2D2728902BA0BF1F    <1> 	db	2Dh, 27h, 28h, 90h, 2Bh, 0A0h, 0BFh, 1Fh
   171 00006000 004F0D0E00000000    <1> 	db	00h, 4Fh, 0Dh, 0Eh, 00h, 00h, 00h, 00h
   172 00006008 9C8E8F141F96B9A3    <1> 	db	9Ch, 8Eh, 8Fh, 14h, 1Fh, 96h, 0B9h, 0A3h
   173 00006010 FF                  <1> 	db	0FFh	; crtc_regs
   174 00006011 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   175 00006019 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   176 00006021 0C000F08            <1> 	db	0Ch, 00h, 0Fh, 08h  ; actl regs
   177 00006025 0000000000100E0FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 10h, 0Eh, 0Fh, 0FFh ; grdc regs
   178                              <1> ;vga_mode_07h:	; mode 07h, 80*25 text, mono color
   179                              <1> ;	db	80, 24, 16, 00h, 10h  ; tw, th-1, ch, slength
   180                              <1> ;	db	00h, 03h, 00h, 02h ; sequ regs
   181                              <1> ;	db	66h	; misc reg
   182                              <1> ;	db	5Fh, 4Fh, 50h, 82h, 55h, 81h, 0BFh, 1Fh
   183                              <1> ;	db	00h, 4Fh, 0Dh, 0Eh, 00h, 00h, 00h, 00h
   184                              <1> ;	db	9Ch, 8Eh, 8Fh, 28h, 0Fh, 96h, 0B9h, 0A3h
   185                              <1> ;	db	0FFh	; crtc regs
   186                              <1> ;	db	00h, 08h, 08h, 08h, 08h, 08h, 08h, 08h
   187                              <1> ;	db	10h, 18h, 18h, 18h, 18h, 18h, 18h, 18h
   188                              <1> ;	db	0Eh, 00h, 0Fh, 08h  ; actl regs
   189                              <1> ;	db	00h, 00h, 00h, 00h, 00h, 10h, 0Ah, 0Fh, 0FFh ; grdc regs
   190                              <1> vga_mode_04h:	; 320*200 graphics, 4 colors, CGA
   191 0000602E 2818080008          <1> 	db	40, 24, 8, 00h, 08h   ; tw, th-1, ch, slength
   192 00006033 09030002            <1> 	db	09h, 03h, 00h, 02h ; sequ regs
   193 00006037 63                  <1> 	db	63h	; misc reg
   194 00006038 2D2728902B80BF1F    <1> 	db	2Dh, 27h, 28h, 90h, 2Bh, 80h, 0BFh, 1Fh
   195 00006040 00C1000000000000    <1> 	db	00h, 0C1h, 00h, 00h, 00h, 00h, 00h, 00h
   196 00006048 9C8E8F140096B9A2    <1> 	db	9Ch, 8Eh, 8Fh, 14h, 00h, 96h, 0B9h, 0A2h
   197 00006050 FF                  <1> 	db	0FFh	; crtc_regs
   198 00006051 0013151702040607    <1> 	db	00h, 13h, 15h, 17h, 02h, 04h, 06h, 07h
   199 00006059 1011121314151617    <1> 	db	10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h
   200 00006061 01000300            <1> 	db	01h, 00h, 03h, 00h ; actl regs
   201 00006065 0000000000300F0FFF  <1> 	db 	00h, 00h, 00h, 00h, 00h, 30h, 0Fh, 0Fh, 0FFh ; grdc regs
   202                              <1> vga_mode_06h:	; 640*200 graphics, 2 colors, CGA
   203 0000606E 5018080010          <1> 	db	80, 24, 8, 00h, 10h   ;	tw, th-1, ch, slength
   204 00006073 01010006            <1> 	db	01h, 01h, 00h, 06h ; sequ regs
   205 00006077 63                  <1> 	db	63h	; misc reg
   206 00006078 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   207 00006080 00C1000000000000    <1> 	db	00h, 0C1h, 00h, 00h, 00h, 00h, 00h, 00h
   208 00006088 9C8E8F280096B9C2    <1> 	db	9Ch, 8Eh, 8Fh, 28h, 00h, 96h, 0B9h, 0C2h
   209 00006090 FF                  <1> 	db	0FFh	; crtc regs
   210 00006091 0017171717171717    <1> 	db	00h, 17h, 17h, 17h, 17h, 17h, 17h, 17h
   211 00006099 1717171717171717    <1> 	db	17h, 17h, 17h, 17h, 17h, 17h, 17h, 17h
   212 000060A1 01000100            <1> 	db	01h, 00h, 01, 00h  ; actl regs
   213 000060A5 0000000000000D0FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 0Dh, 0Fh, 0FFh ; grdc regs
   214                              <1> vga_mode_13h:  ; mode 13h, 300*200, 256 colors, linear
   215 000060AE 2818080000          <1> 	db 	40, 24, 8, 0, 0	; tw, th-1, ch, slength (5)
   216 000060B3 010F000E            <1> 	db	01h, 0Fh, 00h, 0Eh ; sequ regs (4)
   217 000060B7 63                  <1> 	db	63h	; misc reg (1)
   218 000060B8 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh 
   219 000060C0 0041000000000000    <1>  	db 	00h, 41h, 00h, 00h, 00h, 00h, 00h, 00h
   220 000060C8 9C8E8F284096B9A3    <1> 	db	9Ch, 8Eh, 8Fh, 28h, 40h, 96h, 0B9h, 0A3h
   221 000060D0 FF                  <1> 	db	0FFh	; crtc regs (25)
   222 000060D1 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   223 000060D9 08090A0B0C0D0E0F    <1>  	db	08h, 09h, 0Ah, 0Bh, 0Ch, 0Dh, 0Eh, 0Fh
   224 000060E1 41000F00            <1>  	db	41h, 00h, 0Fh, 00h  ; actl regs (20)
   225 000060E5 000000000040050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 40h, 05h, 0Fh, 0FFh ; grdc regs (9)
   226                              <1> vga_mode_setl equ $ - vga_mode_13h  ; = 64
   227                              <1> vga_mode_F0h:  ; mode X ; 320*240, 256 colors, planar
   228 000060EE 2818080000          <1> 	db 	40, 24, 8, 0, 0	; tw, th-1, ch, slength
   229 000060F3 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   230 000060F7 E3                  <1> 	db	0E3h	; misc reg
   231 000060F8 5F4F508254800D3E    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0Dh, 3Eh 
   232 00006100 0041000000000000    <1>  	db 	00h, 41h, 00h, 00h, 00h, 00h, 00h, 00h
   233 00006108 EAACDF2800E706E3    <1> 	db	0EAh, 0ACh, 0DFh, 28h, 00h, 0E7h, 06h, 0E3h
   234 00006110 FF                  <1> 	db	0FFh	; crtc regs (25)
   235 00006111 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   236 00006119 08090A0B0C0D0E0F    <1>  	db	08h, 09h, 0Ah, 0Bh, 0Ch, 0Dh, 0Eh, 0Fh
   237 00006121 41000F00            <1>  	db	41h, 00h, 0Fh, 00h  ; actl regs
   238 00006125 000000000040050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 40h, 05h, 0Fh, 0FFh ; grdc regs
   239                              <1> vga_mode_12h:  ; mode 12h, 640*480, 16 colors, planar
   240 0000612E 501D100000          <1>  	db 	80, 29, 16, 0, 0 ; tw, th-1, ch, slength
   241 00006133 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   242 00006137 E3                  <1> 	db 	0E3h	; misc reg
   243 00006138 5F4F508254800B3E    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0Bh, 3Eh
   244 00006140 0040000000000000    <1> 	db	00h, 40h, 00h, 00h, 00h, 00h, 00h, 00h
   245 00006148 EA8CDF2800E704E3    <1>  	db	0EAh, 8Ch, 0DFh, 28h, 00h, 0E7h, 04h, 0E3h
   246 00006150 FF                  <1> 	db	0FFh	; crtc regs
   247 00006151 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   248 00006159 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   249 00006161 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   250 00006165 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   251                              <1> vga_mode_6Ah:  ; mode 6Ah, 800*600, 16 colors, planar
   252 0000616E 6424100000          <1>  	db 	100, 36, 16, 0, 0 ; tw, th-1, ch, slength
   253 00006173 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   254 00006177 E3                  <1> 	db 	0E3h	; misc reg
   255 00006178 7F6363836B1B72F0    <1> 	db	7Fh, 63h, 63h, 83h, 6Bh, 1Bh, 72h, 0F0h
   256 00006180 0060000000000000    <1> 	db	00h, 60h, 00h, 00h, 00h, 00h, 00h, 00h
   257 00006188 598D5732005773E3    <1>  	db	59h, 8Dh, 57h, 32h, 00h, 57h, 73h, 0E3h
   258 00006190 FF                  <1> 	db	0FFh	; crtc regs
   259 00006191 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   260 00006199 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   261 000061A1 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   262 000061A5 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   263                              <1> vga_mode_0Dh:  ; mode 0Dh, 320*200, 16 colors, planar
   264 000061AE 2818080020          <1>  	db 	40, 24, 8, 0, 20h ; tw, th-1, ch, slength
   265 000061B3 090F0006            <1> 	db	09h, 0Fh, 00h, 06h ; sequ regs
   266 000061B7 63                  <1> 	db 	63h	; misc reg
   267 000061B8 2D2728902B80BF1F    <1> 	db	2Dh, 27h, 28h, 90h, 2Bh, 80h, 0BFh, 1Fh
   268 000061C0 00C0000000000000    <1> 	db	00h, 0C0h, 00h, 00h, 00h, 00h, 00h, 00h
   269 000061C8 9C8E8F140096B9E3    <1>  	db	9Ch, 8Eh, 8Fh, 14h, 00h, 96h, 0B9h, 0E3h
   270 000061D0 FF                  <1> 	db	0FFh	; crtc regs
   271 000061D1 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   272 000061D9 1011121314151617    <1> 	db	10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h
   273 000061E1 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   274 000061E5 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   275                              <1> vga_mode_0Eh:  ; mode 0Eh, 640*200, 16 colors, planar
   276 000061EE 5018080040          <1>  	db 	80, 24, 8, 0, 40h ; tw, th-1, ch, slength
   277 000061F3 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   278 000061F7 63                  <1> 	db 	63h	; misc reg
   279 000061F8 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   280 00006200 00C0000000000000    <1> 	db	00h, 0C0h, 00h, 00h, 00h, 00h, 00h, 00h
   281 00006208 9C8E8F280096B9E3    <1>  	db	9Ch, 8Eh, 8Fh, 28h, 00h, 96h, 0B9h, 0E3h
   282 00006210 FF                  <1> 	db	0FFh	; crtc regs
   283 00006211 0001020304050607    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 06h, 07h
   284 00006219 1011121314151617    <1> 	db	10h, 11h, 12h, 13h, 14h, 15h, 16h, 17h
   285 00006221 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   286 00006225 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   287                              <1> vga_mode_10h: ; mode 10h, 640*350, 16 colors, planar
   288 0000622E 50180E0080          <1>  	db 	80, 24, 14, 0, 80h ; tw, th-1, ch, slength
   289 00006233 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   290 00006237 A3                  <1> 	db 	0A3h	; misc reg
   291 00006238 5F4F50825480BF1F    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0BFh, 1Fh
   292 00006240 0040000000000000    <1> 	db	00h, 40h, 00h, 00h, 00h, 00h, 00h, 00h
   293 00006248 83855D280F63BAE3    <1>  	db	83h, 85h, 5Dh, 28h, 0Fh, 63h, 0BAh, 0E3h
   294 00006250 FF                  <1> 	db	0FFh	; crtc regs
   295 00006251 0001020304051407    <1> 	db	00h, 01h, 02h, 03h, 04h, 05h, 14h, 07h
   296 00006259 38393A3B3C3D3E3F    <1> 	db	38h, 39h, 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh
   297 00006261 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   298 00006265 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   299                              <1> vga_mode_11h: ; mode 11h, 640*480, mono color, planar
   300 0000626E 501D100000          <1>  	db 	80, 29, 16, 0, 0   ; tw, th-1, ch, slength
   301 00006273 010F0006            <1> 	db	01h, 0Fh, 00h, 06h ; sequ regs
   302 00006277 E3                  <1> 	db 	0E3h	; misc reg
   303 00006278 5F4F508254800B3E    <1> 	db	5Fh, 4Fh, 50h, 82h, 54h, 80h, 0Bh, 3Eh
   304 00006280 0040000000000000    <1> 	db	00h, 40h, 00h, 00h, 00h, 00h, 00h, 00h
   305 00006288 EA8CDF2800E704E3    <1>  	db	0EAh, 8Ch, 0DFh, 28h, 00h, 0E7h, 04h, 0E3h
   306 00006290 FF                  <1> 	db	0FFh	; crtc regs
   307 00006291 003F003F003F003F    <1> 	db	00h, 3Fh, 00h, 3Fh, 00h, 3Fh, 00h, 3Fh
   308 00006299 003F003F003F003F    <1> 	db	00h, 3Fh, 00h, 3Fh, 00h, 3Fh, 00h, 3Fh
   309 000062A1 01000F00            <1> 	db	01h, 00h, 0Fh, 00h  ; actl regs
   310 000062A5 000000000000050FFF  <1> 	db	00h, 00h, 00h, 00h, 00h, 00h, 05h, 0Fh, 0FFh ; grdc regs
   311                              <1> end_of_vga_params:
   312                              <1> 
   313                              <1> ; /// End Of VIDEO DATA ///
  2298                                  ;%include 'diskdata.s'	; DISK (BIOS) DATA (initialized)
  2299                                  ;;;
  2300                                  
  2301                                  Align 2
  2302                                  
  2303                                  %include 'sysdefs.s' ; 24/01/2015
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - SYSTEM DEFINITIONS : sysdefs.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 31/12/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    11                              <1> ; sysdefs.inc (14/11/2015)
    12                              <1> ; ****************************************************************************
    13                              <1> 
    14                              <1> ; Retro UNIX 386 v1 Kernel - SYSDEFS.INC
    15                              <1> ; Last Modification: 14/11/2015
    16                              <1> ;
    17                              <1> ; ///////// RETRO UNIX 386 V1 SYSTEM DEFINITIONS ///////////////
    18                              <1> ; (Modified from 
    19                              <1> ;	Retro UNIX 8086 v1 system definitions in 'UNIX.ASM', 01/09/2014)
    20                              <1> ; ((UNIX.ASM (RETRO UNIX 8086 V1 Kernel), 11/03/2013 - 01/09/2014))
    21                              <1> ; 	UNIX.ASM (MASM 6.11) --> SYSDEFS.INC (NASM 2.11)
    22                              <1> ; ----------------------------------------------------------------------------
    23                              <1> ;
    24                              <1> ; Derived from UNIX Operating System (v1.0 for PDP-11) 
    25                              <1> ; (Original) Source Code by Ken Thompson (1971-1972)
    26                              <1> ; <Bell Laboratories (17/3/1972)>
    27                              <1> ; <Preliminary Release of UNIX Implementation Document>
    28                              <1> ;
    29                              <1> ; ****************************************************************************
    30                              <1> 
    31                              <1> nproc 	equ	16  ; number of processes
    32                              <1> nfiles 	equ	50
    33                              <1> ntty	equ     8   ; 8+1 -> 8 (10/05/2013)
    34                              <1> nbuf	equ	4   ; 6 ;; 21/08/2015 - 'namei' buffer problem when nbuf > 4 	
    35                              <1> 		; NOTE: If fd0 super block buffer addres is beyond of the 1st
    36                              <1> 		; 32K, DMA r/w routine or someting else causes a jump to 
    37                              <1> 		; kernel panic routine (in 'alloc' routine, in u5.s)
    38                              <1> 		; because of invalid buffer content (r/w error). 
    39                              <1> 		; When all buffers are set before the end of the 1st 32k,
    40                              <1> 		; there is no problem!? (14/11/2015) 
    41                              <1> 
    42                              <1> ;csgmnt	equ	2000h	; 26/05/2013 (segment of process 1)
    43                              <1> ;core	equ 	0  	    ; 19/04/2013	
    44                              <1> ;ecore	equ	32768 - 64  ; 04/06/2013 (24/05/2013)
    45                              <1> 	; (if total size of argument list and arguments is 128 bytes)
    46                              <1> 	; maximum executable file size = 32768-(64+40+128-6) = 32530 bytes
    47                              <1> 	; maximum stack size = 40 bytes (+6 bytes for 'IRET' at 32570)	
    48                              <1> 	; initial value of user's stack pointer = 32768-64-128-2 = 32574
    49                              <1> 	; 	(sp=32768-args_space-2 at the beginning of execution)
    50                              <1> 	; argument list offset = 32768-64-128 = 32576 (if it is 128 bytes)
    51                              <1> 	; 'u' structure offset (for the '/core' dump file) = 32704
    52                              <1> 	; '/core' dump file size = 32768 bytes
    53                              <1>  
    54                              <1> ; 08/03/2014 
    55                              <1> ;sdsegmnt equ	6C0h  ; 256*16 bytes (swap data segment size for 16 processes)		 	 
    56                              <1> ; 19/04/2013 Retro UNIX 8086 v1 feaure only !
    57                              <1> ;;sdsegmnt equ 	740h  ; swap data segment (for user structures and registers)
    58                              <1> 
    59                              <1> ; 30/08/2013
    60                              <1> time_count equ 4 ; 10 --> 4 01/02/2014
    61                              <1> 
    62                              <1> ; 05/02/2014
    63                              <1> ; process status
    64                              <1> ;SFREE 	equ 0
    65                              <1> ;SRUN	equ 1
    66                              <1> ;SWAIT	equ 2
    67                              <1> ;SZOMB	equ 3
    68                              <1> ;SSLEEP	equ 4 ; Retro UNIX 8086 V1 extension (for sleep and wakeup)
    69                              <1> 
    70                              <1> ; 09/03/2015
    71                              <1> userdata equ 80000h ; user structure data address for current user ; temporary
    72                              <1> swap_queue equ 90000h - 2000h ; swap queue address ; temporary
    73                              <1> swap_alloc_table equ 0D0000h  ;  swap allocation table address ; temporary
    74                              <1> 
    75                              <1> ; 17/09/2015
    76                              <1> ESPACE equ 48 ; [u.usp] (at 'sysent') - [u.sp] value for error return
    77                              <1> 
    78                              <1> ; 31/12/2017
    79                              <1> ; 19/02/2017
    80                              <1> ; 15/10/2016
    81                              <1> ; 20/05/2016
    82                              <1> ; 19/05/2016
    83                              <1> ; 18/05/2016
    84                              <1> ; 29/04/2016 
    85                              <1> ; TRDOS 386 (TRDOS v2.0) system calls - temporary List 
    86                              <1> ; 14/07/2013 - 21/09/2015 (Retro UNIX 8086 & 386 system calls) 
    87                              <1> _ver 	equ 0 ; Get TRDOS version (v2.0)
    88                              <1> _exit 	equ 1
    89                              <1> _fork 	equ 2
    90                              <1> _read 	equ 3
    91                              <1> _write	equ 4
    92                              <1> _open	equ 5
    93                              <1> _close 	equ 6
    94                              <1> _wait 	equ 7
    95                              <1> _creat 	equ 8
    96                              <1> _rename	equ 9  ; TRDOS 386, Rename File (31/12/2017)	
    97                              <1> _delete	equ 10 ; TRDOS 386, Delete File (29/12/2017)
    98                              <1> _exec	equ 11
    99                              <1> _chdir	equ 12
   100                              <1> _time 	equ 13 ; TRDOS 386, Get Sys Date&Time (30/12/2017)
   101                              <1> _mkdir 	equ 14
   102                              <1> _chmod	equ 15 ; TRDOS 386, Change Attributes (30/12/2017) 
   103                              <1> _rmdir	equ 16 ; TRDOS 386, Remove Directory (29/12/2017)
   104                              <1> _break	equ 17
   105                              <1> _drive	equ 18 ; TRDOS 386, Get/Set Current Drv (30/12/2017) 
   106                              <1> _seek	equ 19
   107                              <1> _tell 	equ 20
   108                              <1> _mem	equ 21 ; TRDOS 386, Get Total&Free Mem (31/12/2017)
   109                              <1> _prompt	equ 22 ; TRDOS 386, Change Cmd Prompt (31/12/2017)
   110                              <1> _path	equ 23 ; TRDOS 386, Get/Set Run Path (31/12/2017)
   111                              <1> _env	equ 24 ; TRDOS 386, Get/Set Env Vars (31/12/2017)
   112                              <1> _stime	equ 25 ; TRDOS 386, Set Sys Date&Time (30/12/2017)
   113                              <1> _quit	equ 26	
   114                              <1> _intr	equ 27
   115                              <1> _dir	equ 28 ; TRDOS 386, Get Curr Drive&Dir (30/12/2017) 
   116                              <1> _emt 	equ 29
   117                              <1> _ldrvt 	equ 30 ; TRDOS 386, Get Logical DOS DDT (30/12/2017)
   118                              <1> _video  equ 31 ; TRDOS 386 Video Functions (16/05/2016)
   119                              <1> _audio	equ 32 ; TRDOS 386 Video Functions (16/05/2016)
   120                              <1> _timer	equ 33 ; TRDOS 386 Timer Functions (18/05/2016)
   121                              <1> _sleep	equ 34 ; Retro UNIX 8086 v1 feature only !
   122                              <1> _msg	equ 35 ; Retro UNIX 386 v1 feature only !
   123                              <1> _geterr	equ 36 ; Retro UNIX 386 v1 feature only !
   124                              <1> _fpsave equ 37 ; TRDOS 386 FPU state option (28/02/2017)
   125                              <1> _pri 	equ 38 ; change priority - TRDOS 386 (20/05/2016)
   126                              <1> _rele	equ 39 ; TRDOS 386 (19/05/2016)
   127                              <1> _fff	equ 40 ; Find First File - TRDOS 386 (15/10/2016)
   128                              <1> _fnf	equ 41 ; Find Next File - TRDOS 386 (15/10/2016)
   129                              <1> _alloc	equ 42 ; Allocate memory - TRDOS 386 (19/02/2017)
   130                              <1> 	       ; TRDOS 386 (19/02/2017) DMA buff fuctions		
   131                              <1> _dalloc equ 43 ; Deallocate mem - TRDOS 386 (19/02/2017)
   132                              <1> _calbac equ 44 ; Set IRQ callback - TRDOS 386 (20/02/2017)  				
   133                              <1> _dma	equ 45 ; DMA service - TRDOS 386 (20/08/2017)  
   134                              <1> 
   135                              <1> %macro sys 1-4
   136                              <1>     ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)	
   137                              <1>     ; 03/09/2015	
   138                              <1>     ; 13/04/2015
   139                              <1>     ; Retro UNIX 386 v1 system call.		
   140                              <1>     %if %0 >= 2   
   141                              <1>         mov ebx, %2
   142                              <1>         %if %0 >= 3    
   143                              <1>             mov ecx, %3
   144                              <1>             %if %0 = 4
   145                              <1>                mov edx, %4   
   146                              <1>             %endif
   147                              <1>         %endif
   148                              <1>     %endif
   149                              <1>     mov eax, %1
   150                              <1>     ;int 30h
   151                              <1>     int 40h ; TRDOS 386 (TRDOS v2.0)		   
   152                              <1> %endmacro
   153                              <1> 
   154                              <1> ; TRDOS 386 system calls, interrupt number
   155                              <1> ; 25/12/2016
   156                              <1> SYSCALL_INT_NUM   equ '40' ; '40h'
   157                              <1> 
   158                              <1> ; 13/05/2015 - ERROR CODES
   159                              <1> ERR_FILE_NOT_OPEN  equ 10 ; 'file not open !' error
   160                              <1> ERR_FILE_ACCESS    equ 11 ; 'permission denied !' error
   161                              <1> ; 14/05/2015
   162                              <1> ERR_DIR_ACCESS     equ 11 ; 'permission denied !' error
   163                              <1> ERR_FILE_NOT_FOUND equ 12 ; 'file not found !' error
   164                              <1> ERR_TOO_MANY_FILES equ 13 ; 'too many open files !' error
   165                              <1> ERR_DIR_EXISTS     equ 14 ; 'directory already exists !' error 	
   166                              <1> ; 16/05/2015		
   167                              <1> ERR_DRV_NOT_RDY    equ 15 ; 'drive not ready !' error
   168                              <1> ; 18/05/2015
   169                              <1> ERR_DEV_NOT_RDY    equ 15 ; 'device not ready !' error
   170                              <1> ERR_DEV_ACCESS     equ 11 ; 'permission denied !' error 
   171                              <1> ERR_DEV_NOT_OPEN   equ 10 ; 'device not open !' error	
   172                              <1> ; 07/06/2015
   173                              <1> ERR_FILE_EOF	   equ 16 ; 'end of file !' error
   174                              <1> ERR_DEV_VOL_SIZE   equ 16 ; 'out of volume !' error
   175                              <1> ; 09/06/2015
   176                              <1> ERR_DRV_READ	   equ 17 ; 'disk read error !'
   177                              <1> ERR_DRV_WRITE	   equ 18 ; 'disk write error !'
   178                              <1> ; 16/06/2015
   179                              <1> ERR_NOT_DIR	   equ 19 ; 'not a (valid) directory !' error
   180                              <1> ERR_FILE_SIZE	   equ 20 ; 'file size error !'	
   181                              <1> ; 22/06/2015
   182                              <1> ERR_NOT_SUPERUSER  equ 11 ; 'permission denied !' error
   183                              <1> ERR_NOT_OWNER      equ 11 ; 'permission denied !' error
   184                              <1> ERR_NOT_FILE       equ 11 ; 'permission denied !' error	
   185                              <1> ; 23/06/2015
   186                              <1> ERR_FILE_EXISTS    equ 14 ; 'file already exists !' error
   187                              <1> ERR_DRV_NOT_SAME   equ 21 ; 'not same drive !' error
   188                              <1> ERR_DIR_NOT_FOUND  equ 12 ; 'directory not found !' error
   189                              <1> ERR_NOT_EXECUTABLE equ 22 ; 'not executable file !' error
   190                              <1> ; 27/06/2015
   191                              <1> ERR_INV_PARAMETER  equ 23 ; 'invalid parameter !' error
   192                              <1> ERR_INV_DEV_NAME   equ 24 ; 'invalid device name !' error
   193                              <1> ; 29/06/2015
   194                              <1> ERR_TIME_OUT	   equ 25 ; 'time out !' error			
   195                              <1> ERR_DEV_NOT_RESP   equ 25 ; 'device not responding !' error
   196                              <1> ; 10/10/2016
   197                              <1> ERR_INV_FILE_NAME  equ 26 ; 'invalid file name !' error
   198                              <1> ERR_INV_FLAGS	   equ 23 ; 'invalid flags !' error
   199                              <1> ; For code compatibility with previous version of TRDOS (2011)
   200                              <1> ; (Temporary error codes for current TRDOS 386 -2016- version) 
   201                              <1> ERR_NO_MORE_FILES  equ 12 ; 'no more files !' error
   202                              <1> ERR_PATH_NOT_FOUND equ  3 ; 'path not found !' error 
   203                              <1> 			  ; 'dir not found !' ; TRDOS 8086
   204                              <1> ERR_NOT_FOUND:	   equ  2 ; 'file not found !' ; TRDOS 8086
   205                              <1> ERR_DISK_SPACE	   equ 39 ; 'out of volume !' TRDOS 8086
   206                              <1> 			  ; 'insufficient disk space !' ; 27h
   207                              <1> ERR_DISK_WRITE	   equ 30 ; 'disk write protected !' ; 16/10/2016
   208                              <1> ERR_ACCESS_DENIED  equ  5 ; 'access denied !' ; TRDOS 8086 	
   209                              <1> ; 28/02/2017
   210                              <1> ERR_PERM_DENIED	   equ 11 ; 'permission denied !' error  	
   211                              <1> ; 18/05/2016
   212                              <1> ERR_MISC	   equ 27 ; miscellaneous/other errors
   213                              <1> ; 15/10/2016
   214                              <1> ; TRDOS 8086 -> TRDOS 386 (0Bh -> 28)
   215                              <1> ERR_INV_FORMAT	   equ 28 ; 'invalid format !' error
   216                              <1> ; TRDOS 8086 -> TRDOS 386 (0Dh -> 29)
   217                              <1> ERR_INV_DATA	   equ 29 ; 'invalid data !' error
   218                              <1> ; TRDOS 8086 -> TRDOS 386 (0Eh -> 20)
   219                              <1> ERR_ZERO_LENGTH	   equ 20  ; 'zero length !' error 	
   220                              <1> ; TRDOS 8086 -> TRDOS 386 (15h -> 17, 1Dh -> 18, 1Eh -> 17) 	
   221                              <1> ERR_DRV_NR_READ	   equ 17 ; 'drive not ready or read error !'
   222                              <1> ERR_DRV_NR_WRITE   equ 18 ; 'drive not ready or write error !'		
   223                              <1> ; 15/10/2016
   224                              <1> ERR_INV_PATH_NAME  equ 19 ; 'bad path name !' error
   225                              <1> ERR_BAD_CMD_ARG	   equ  1 ; 'bad command argument !' ; TRDOS 8086
   226                              <1> ERR_INV_FNUMBER	   equ  1 ; 'invalid function number !' ; TRDOS 8086
   227                              <1> ERR_BIG_FILE	   equ  8 ; 'big file & out of memory ! ; TRDOS 8086 	
   228                              <1> ERR_BIG_DATA	   equ  8 ; 'big data & out of memory ! ; TRDOS 8086
   229                              <1> ERR_CLUSTER	   equ 35 ; 'cluster not available !' ; TRDOS 8086
   230                              <1> ERR_OUT_OF_MEMORY  equ  4 ; 'out of memory !'
   231                              <1> 			  ; 'insufficient memory !'
   232                              <1> ERR_P_VIOLATION	   equ	6 ; 'protection violation !'
   233                              <1> ERR_PAGE_FAULT	   equ 224 ;'page fault !' ;0E0h						 
   234                              <1> ERR_SWP_DISK_READ  	   equ 40
   235                              <1> ERR_SWP_DISK_NOT_PRESENT   equ 41
   236                              <1> ERR_SWP_SECTOR_NOT_PRESENT equ 42
   237                              <1> ERR_SWP_NO_FREE_SPACE      equ 43
   238                              <1> ERR_SWP_DISK_WRITE         equ 44
   239                              <1> ERR_SWP_NO_PAGE_TO_SWAP    equ 45
   240                              <1> ; 10/04/2017
   241                              <1> ERR_BUFFER	   equ 46  ; 'buffer error !'
   242                              <1> ; 28/08/2017 (20/08/2017)
   243                              <1> ERR_DMA		   equ -1  ; DMA buffer (allocation/misc.) error!
   244                              <1> 
   245                              <1> ; 26/08/2015
   246                              <1> ; 24/07/2015
   247                              <1> ; 24/06/2015
   248                              <1> MAX_ARG_LEN	   equ 256 ; max. length of sys exec arguments
   249                              <1> ; 01/07/2015
   250                              <1> MAX_MSG_LEN	   equ 255 ; max. msg length for 'sysmsg'
   251                              <1> ;	
   252                              <1> ; 06/10/2016
   253                              <1> OPENFILES	   equ 10  ; max. number of open files (system)
   254                              <1> ; 07/10/2016
   255                              <1> ;NUMOFDEVICES	   equ 20  ; max. num of available devices (sys)
   256                              <1> 			 		
  2304                                  %include 'trdosk0.s' ; 04/01/2016 
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - DEFINITIONS : trdosk0.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 29/02/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 04/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; TRDOS2.ASM (09/11/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; TRDOS2.ASM (c) 2004-2011 Erdogan TAN [ 17/01/2004 ] Last Update: 09/11/2011
    14                              <1> ;
    15                              <1> ; Masterboot / Partition Table at Beginning+1BEh
    16                              <1> ptBootable       equ 0
    17                              <1> ptBeginHead      equ 1
    18                              <1> ptBeginSector    equ 2
    19                              <1> ptBeginCylinder  equ 3
    20                              <1> ptFileSystemID   equ 4
    21                              <1> ptEndHead        equ 5
    22                              <1> ptEndSector      equ 6
    23                              <1> ptEndCylinder    equ 7
    24                              <1> ptStartSector    equ 8
    25                              <1> ptSectors        equ 12
    26                              <1> 
    27                              <1> ; Boot Sector Parameters at 7C00h
    28                              <1> DataArea1     equ -4
    29                              <1> DataArea2     equ -2
    30                              <1> BootStart     equ 0h
    31                              <1> OemName       equ 03h
    32                              <1> BytesPerSec   equ 0Bh
    33                              <1> SecPerClust   equ 0Dh
    34                              <1> ResSectors    equ 0Eh
    35                              <1> FATs          equ 10h
    36                              <1> RootDirEnts   equ 11h
    37                              <1> Sectors       equ 13h
    38                              <1> Media         equ 15h
    39                              <1> FATSecs       equ 16h
    40                              <1> SecPerTrack   equ 18h
    41                              <1> Heads         equ 1Ah 
    42                              <1> Hidden1       equ 1Ch
    43                              <1> Hidden2       equ 1Eh
    44                              <1> HugeSec1      equ 20h
    45                              <1> HugeSec2      equ 22h
    46                              <1> DriveNumber   equ 24h
    47                              <1> Reserved1     equ 25h
    48                              <1> bootsignature equ 26h                 
    49                              <1> VolumeID      equ 27h
    50                              <1> VolumeLabel   equ 2Bh
    51                              <1> FileSysType   equ 36h          
    52                              <1> Reserved2     equ 3Eh                           ; Starting cluster of P2000
    53                              <1> 
    54                              <1> ; FAT32 BPB Structure
    55                              <1> FAT32_FAT_Size equ 36
    56                              <1> FAT32_RootFClust equ 44
    57                              <1> FAT32_FSInfoSec equ 48
    58                              <1> FAT32_DrvNum equ 64
    59                              <1> FAT32_BootSig equ 66
    60                              <1> FAT32_VolID equ 67
    61                              <1> FAT32_VolLab equ 71
    62                              <1> FAT32_FilSysType equ 82
    63                              <1> 
    64                              <1> ; BIOS Disk Parameters
    65                              <1> DPDiskNumber  equ 0h
    66                              <1> DPDType       equ 1h
    67                              <1> DPReturn      equ 2h
    68                              <1> DPHeads       equ 3h
    69                              <1> DPCylinders   equ 4h
    70                              <1> DPSecPerTrack equ 6h
    71                              <1> DPDisks       equ 7h
    72                              <1> DPTableOff    equ 8h
    73                              <1> DPTableSeg    equ 0Ah
    74                              <1> DPNumOfSecs   equ 0Ch
    75                              <1> 
    76                              <1> ; BIOS INT 13h Extensions (LBA extensions)
    77                              <1> ; Just After DP Data (DPDiskNumber+)
    78                              <1> DAP_PacketSize equ 10h  ; If extensions present, this byte will be >=10h
    79                              <1> DAP_Reserved1 equ 11h   ; Reserved Byte 
    80                              <1> DAP_NumOfBlocks equ 12h ; Value of this byte must be 0 to 127
    81                              <1> DAP_Reserved2 equ 13h   ; Reserved Byte
    82                              <1> DAP_Destination equ 14h ; Address of Transfer Buffer as SEGMENT:OFFSET
    83                              <1> DAP_LBA_Address equ 18h ; LBA=(C1*H0+H1)*S0+S1-1
    84                              <1>                         ; C1= Selected Cylinder Number
    85                              <1>                         ; H0= Number Of Heads (Maximum Head Number + 1)
    86                              <1>                         ; H1= Selected Head Number
    87                              <1>                         ; S0= Maximum Sector Number
    88                              <1>                         ; S1= Selected Sector Number
    89                              <1>                         ; QUAD WORD
    90                              <1> ; DAP_Flat_Destination equ 20h ; 64 bit address, if value in 4h is FFFF:FFFFh
    91                              <1>                              ; QUAD WORD (Also, value in 0h must be 18h) 
    92                              <1>                              ; TR-DOS will not use 64 bit Flat Address
    93                              <1> 
    94                              <1> ; INT 13h Function 48h "Get Enhanced Disk Drive Parameters"
    95                              <1> ; Just After DP Data (DPDiskNumber+)
    96                              <1> GetDParams_48h equ 20h ; Word. Data Length, must be 26 (1Ah) for short data.
    97                              <1> GDP_48h_InfoFlag equ 22h ; Word
    98                              <1> ; Bit 1 = 1 -> The geometry returned in bytes 4-15 is valid.
    99                              <1> GDP_48h_NumOfPCyls equ 24h ; Double Word. Number physical cylinders.
   100                              <1> GDP_48h_NumOfPHeads equ 28h ; Double Word. Number of physical heads.
   101                              <1> GDP_48h_NumOfPSpT equ 2Ch ; Double word. Num of physical sectors per track.
   102                              <1> GDP_48h_LBA_Sectors equ 30h ; 8 bytes. Number of physical/LBA sectors.
   103                              <1> GDP_48h_BytesPerSec equ 38h ; Word. Number of bytes in a sector.
   104                              <1> 
   105                              <1> ; TR-DOS Standalone Program Extensions to the DiskParams Block
   106                              <1> ; Just After DP Data (DPDiskNumber+)
   107                              <1> TRDP_CurrentSector equ 3Ah  ; DX:AX (LBA)
   108                              <1> TRDP_SectorCount equ 3Eh    ; CX (or Counter)
   109                              <1> 
   110                              <1> 
   111                              <1> ; DOS Logical Disks
   112                              <1> LD_Name equ 0
   113                              <1> LD_DiskType equ 1
   114                              <1> LD_PhyDrvNo equ 2
   115                              <1> LD_FATType equ 3
   116                              <1> LD_FSType equ 4
   117                              <1> LD_LBAYes equ 5
   118                              <1> LD_BPB equ 6
   119                              <1> LD_FATBegin equ 96
   120                              <1> LD_ROOTBegin equ 100
   121                              <1> LD_DATABegin equ 104
   122                              <1> LD_StartSector equ 108
   123                              <1> LD_TotalSectors equ 112
   124                              <1> LD_FreeSectors equ 116
   125                              <1> LD_Clusters equ 120
   126                              <1> LD_PartitionEntry equ 124
   127                              <1> LD_DParamEntry equ 125
   128                              <1> LD_MediaChanged equ 126
   129                              <1> LD_CDirLevel equ 127
   130                              <1> LD_CurrentDirectory equ 128
   131                              <1> 
   132                              <1> ; Singlix FS Extensions to DOS Logical Disks
   133                              <1> ; 03/01/2010 (LD_BPB compatibility for CHS r/w)
   134                              <1> 
   135                              <1> LD_FS_Name equ 0
   136                              <1> LD_FS_DiskType equ 1
   137                              <1> LD_FS_PhyDrvNo equ 2
   138                              <1> LD_FS_FATType equ 3
   139                              <1> LD_FS_FSType equ 4
   140                              <1> LD_FS_LBAYes equ 5
   141                              <1> LD_FS_BPB equ 6
   142                              <1> LD_FS_MediaAttrib equ 6
   143                              <1> LD_FS_VersionMajor equ 7
   144                              <1> LD_FS_RootDirD equ 8
   145                              <1> LD_FS_MATLocation equ 12
   146                              <1> LD_FS_Reserved1 equ 16 ;1 reserved byte
   147                              <1> LD_FS_BytesPerSec equ 17 ; LD_BPB + 0Bh
   148                              <1> LD_FS_Reserved2 equ 19 ;2 reserved byte
   149                              <1> LD_FS_DATLocation equ 20
   150                              <1> LD_FS_DATSectors equ 24
   151                              <1> LD_FS_Reserved3 equ 28 ;3 reserved word
   152                              <1> LD_FS_SecPerTrack equ 30 ; LD_BPB + 18h
   153                              <1> LD_FS_NumHeads equ 32    ; LD_BPB + 1Ah
   154                              <1> LD_FS_UnDelDirD equ 34
   155                              <1> LD_FS_Reserved4 equ 38 ;4 reserved word
   156                              <1> LD_FS_VolumeSerial equ 40
   157                              <1> LD_FS_VolumeName equ 44
   158                              <1> LD_FS_BeginSector equ 108
   159                              <1> LD_FS_VolumeSize equ 112
   160                              <1> LD_FS_FreeSectors equ 116
   161                              <1> LD_FS_FirstFreeSector equ 120
   162                              <1> LD_FS_PartitionEntry equ 124
   163                              <1> LD_FS_DParamEntry equ 125
   164                              <1> LD_FS_MediaChanged equ 126
   165                              <1> LD_FS_CDirLevel equ 127
   166                              <1> LD_FS_CDIR_Converted equ 128
   167                              <1> 
   168                              <1> ; Valid FAT Types
   169                              <1> FS_FAT12 equ 1
   170                              <1> FS_FAT16_CHS equ 2
   171                              <1> FS_FAT32_CHS equ 3
   172                              <1> FS_FAT16_LBA equ 4
   173                              <1> FS_FAT32_LBA equ 5
   174                              <1> 
   175                              <1> ; Cursor Location
   176                              <1> CCCpointer equ  0450h   ; BIOS data, current cursor column
   177                              <1> ; FAT Clusters EOC sign
   178                              <1> FAT12EOC equ 0FFFh
   179                              <1> FAT16EOC equ 0FFFFh
   180                              <1> ;FAT32EOC equ 0FFFFFFFh ; It is not direct usable for 8086 code
   181                              <1> ; BAD Cluster
   182                              <1> FAT12BADC equ 0FF7h
   183                              <1> FAT16BADC equ 0FFF7h
   184                              <1> ;FAT32BADC equ 0FFFFFF7h ; It is not direct usable for 8086 code
   185                              <1> ; MS-DOS FAT16 FS (Maximum Possible) Last Cluster Number= 0FFF6h 
   186                              <1> 
   187                              <1> ; TRFS
   188                              <1> 
   189                              <1> bs_FS_JmpBoot equ 0 ; jmp short bsBootCode
   190                              <1>                 ; db 0EBh, db 3Fh, db 90h
   191                              <1> bs_FS_Identifier equ 3  ; db 'FS', db 0
   192                              <1> bs_FS_BytesPerSec equ 6 ; dw 512
   193                              <1> bs_FS_MediaAttrib equ 8 ; db 3
   194                              <1> bs_FS_PartitionID equ 9 ; db 0A1h
   195                              <1> bs_FS_VersionMaj equ 10 ; db 01h
   196                              <1> bs_FS_VersionMin equ 11 ; db 0
   197                              <1> bs_FS_BeginSector equ 12   ; dd 0 
   198                              <1> bs_FS_VolumeSize equ 16 ; dd 2880
   199                              <1> bs_FS_StartupFD equ 20 ; dd 0
   200                              <1> bs_FS_MATLocation equ 24 ; dd 1
   201                              <1> bs_FS_RootDirD equ 28 ; dd 8
   202                              <1> bs_FS_SystemConfFD equ 32 ; dd 0
   203                              <1> bs_FS_SwapFD equ 36 ; dd 0
   204                              <1> bs_FS_UnDelDirD equ 40 ; dd 0
   205                              <1> bs_FS_DriveNumber equ 44 ; db 0
   206                              <1> bs_FS_LBA_Ready equ 45 ; db 0
   207                              <1> bs_FS_MagicWord equ 46 
   208                              <1> bs_FS_SecPerTrack equ 46 ; db 0A1h
   209                              <1> bs_FS_Heads equ 47 ; db 01h 
   210                              <1> bs_FS_OperationSys equ 48 ; db "TR-SINGLIX v1.0b"
   211                              <1> bs_FS_Terminator equ 64 ; db 0
   212                              <1> bs_FS_BootCode equ 65 
   213                              <1> 
   214                              <1> FS_MAT_DATLocation equ 12
   215                              <1> FS_MAT_DATScount equ 16
   216                              <1> FS_MAT_FreeSectors equ 20
   217                              <1> FS_MAT_FirstFreeSector equ 24
   218                              <1> FS_RDT_VolumeSerialNo equ 28
   219                              <1> FS_RDT_VolumeName equ 64
   220                              <1> 
   221                              <1> ; FAT12 + FAT16 + FAT32
   222                              <1> BS_JmpBoot equ 0
   223                              <1> BS_OEMName equ 3
   224                              <1> BPB_BytsPerSec equ 11
   225                              <1> BPB_SecPerClust equ 13
   226                              <1> BPB_RsvdSecCnt equ 14
   227                              <1> BPB_NumFATs equ 16
   228                              <1> BPB_RootEntCnt equ 17
   229                              <1> BPB_TotalSec16 equ 19
   230                              <1> BPB_Media equ 21
   231                              <1> BPB_FATSz16 equ 22
   232                              <1> BPB_SecPerTrk equ 24
   233                              <1> BPB_NumHeads equ 26
   234                              <1> BPB_HiddSec equ 28
   235                              <1> BPB_TotalSec32 equ 32
   236                              <1> 
   237                              <1> ; FAT12 and FAT16 only
   238                              <1> BS_DrvNum equ 36
   239                              <1> BS_Reserved1 equ 37
   240                              <1> BS_BootSig equ 38
   241                              <1> BS_VolID equ 39
   242                              <1> BS_VolLab equ 43
   243                              <1> BS_FilSysType equ 54 ; 8 bytes
   244                              <1> BS_BootCode equ 62
   245                              <1> 
   246                              <1> ; FAT32 only
   247                              <1> BPB_FATSz32 equ 36 ; FAT32, 4 bytes
   248                              <1> BPB_ExtFlags equ 40 ; FAT32, 2 bytes
   249                              <1> BPB_FSVer equ 42 ; FAT32, 2 bytes
   250                              <1> BPB_RootClus equ 44 ; FAT32, 4 bytes
   251                              <1> BPB_FSInfo equ 48 ; FAT 32, 2 bytes 
   252                              <1> BPB_BkBootSec equ 50 ; FAT32, 2 bytes
   253                              <1> BPB_Reserved equ 52 ; FAT32, 12 bytes
   254                              <1> BS_FAT32_DrvNum equ 64 ; FAT32, 1 byte
   255                              <1> BS_FAT32_Reserved1 equ 65 ; FAT32, 1 byte
   256                              <1> BS_FAT32_BootSig equ 66 ; FAT32, 1 byte
   257                              <1> BS_FAT32_VolID equ 67 ; FAT32, 4 bytes
   258                              <1> BS_FAT32_VolLab equ 71 ; FAT32, 11 bytes
   259                              <1> BS_FAT32_FilSysType equ 82 ; FAT32, 8 bytes
   260                              <1> BS_FAT32_BootCode equ 90
   261                              <1> 
   262                              <1> ; 29/02/2016
   263                              <1> ;(FAT32 Free Cluster Count & First Free Cluster values)
   264                              <1> ;[BPB_Reserved] = Free Cluster Count (offset 52)
   265                              <1> ;[BPB_Reserved+4] = First Free Cluster (offset 56)
   266                              <1> 
   267                              <1> BS_Validation equ 510
   268                              <1> 
   269                              <1> ; 15/02/2016
   270                              <1> ; FILE.ASM - 09/10/2011
   271                              <1> ; Directory Entry Structure
   272                              <1> ; 29/10/2009 (According to Microsoft FAT32 File System Specification)
   273                              <1> DirEntry_Name equ 0
   274                              <1> DirEntry_Attr equ 11
   275                              <1> DirEntry_NTRes equ 12
   276                              <1> DirEntry_CrtTimeTenth equ 13
   277                              <1> DirEntry_CrtTime equ 14
   278                              <1> DirEntry_CrtDate equ 16
   279                              <1> DirEntry_LastAccDate equ 18
   280                              <1> DirEntry_FstClusHI equ 20
   281                              <1> DirEntry_WrtTime equ 22
   282                              <1> DirEntry_WrtDate equ 24
   283                              <1> DirEntry_FstClusLO equ 26
   284                              <1> DirEntry_FileSize equ 28
  2305                                  %include 'trdosk1.s' ; 04/01/2016 
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.1) - SYS INIT : trdosk1.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 20/01/2018
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 04/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; TRDOS2.ASM (09/11/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; TRDOS2.ASM (c) 2004-2011 Erdogan TAN [ 17/01/2004 ] Last Update: 09/11/2011
    14                              <1> ;
    15                              <1> 
    16                              <1> sys_init:
    17                              <1> 	; 20/01/2018  (v2.0.1)
    18                              <1> 	; 23/01/2017  (v2.0.0)
    19                              <1> 	; 07/05/2016
    20                              <1> 	; 02/05/2016
    21                              <1> 	; 24/04/2016
    22                              <1> 	; 14/04/2016
    23                              <1> 	; 13/04/2016
    24                              <1> 	; 30/03/2016
    25                              <1> 	; 24/01/2016
    26                              <1> 	; 06/01/2016
    27                              <1> 	; 04/01/2016
    28                              <1> 
    29                              <1> 	; 23/01/2017 - reset timer frequency (to 18.2Hz)
    30 000062AE B036                <1> 	mov	al, 00110110b ; 36h
    31 000062B0 E643                <1>  	out	43h, al
    32 000062B2 31C0                <1> 	xor	eax, eax  ; sub	al, al ; 0
    33 000062B4 E640                <1> 	out	40h, al ; LB
    34 000062B6 E640                <1> 	out	40h, al ; HB
    35                              <1>  	; 
    36                              <1> 	; 30/03/2016
    37                              <1> 	; Clear Logical DOS Disk Description Tables Area
    38                              <1> 	;xor	eax, eax
    39 000062B8 BF00010900          <1> 	mov	edi, Logical_DOSDisks
    40 000062BD B980060000          <1> 	mov	ecx, 6656/4 ; 26*256 = 6656 bytes
    41 000062C2 F3AB                <1> 	rep	stosd ; 1664 times 4 bytes
    42                              <1> 
    43 000062C4 B83F3A2F00          <1> 	mov	eax, '?:/'
    44 000062C9 A3[87590100]        <1> 	mov	[Current_Dir_Drv], eax
    45                              <1> 
    46                              <1> 	; Logical DRV INIT (only for hard disks)
    47 000062CE E813040000          <1> 	call 	ldrv_init  ; trdosk2.s
    48                              <1> 	
    49                              <1> 	; When floppy_drv_init call is disabled
    50                              <1> 	; media changed sign is needed
    51                              <1> 	; for proper drive initialization
    52                              <1>         
    53 000062D3 BE00010900          <1> 	mov 	esi, Logical_DOSDisks
    54 000062D8 B001                <1> 	mov 	al, 1 ; Initialization sign (invalid_fd_parameter)
    55 000062DA 83C67E              <1> 	add 	esi, LD_MediaChanged ; Media Change Status = 1 (init needed)
    56 000062DD 8806                <1> 	mov 	[esi], al ; A:
    57 000062DF 81C600010000        <1> 	add 	esi, 100h 
    58 000062E5 8806                <1> 	mov 	[esi], al ; B: 
    59                              <1>            
    60                              <1> _current_drive_bootdisk:
    61 000062E7 8A15[525D0000]      <1> 	mov 	dl, [boot_drv] ; physical drive number
    62 000062ED 80FAFF              <1> 	cmp 	dl, 0FFh
    63 000062F0 740A                <1> 	je 	short _last_dos_diskno_check
    64                              <1> _boot_drive_check:
    65 000062F2 80FA80              <1> 	cmp 	dl, 80h
    66 000062F5 7218                <1> 	jb 	short _current_drive_a
    67 000062F7 80EA7E              <1> 	sub 	dl, 7Eh ; C = 2 , D = 3
    68 000062FA EB13                <1> 	jmp 	short _current_drive_a 
    69                              <1> 
    70                              <1> _last_dos_diskno_check:
    71 000062FC 8A15[610D0100]      <1> 	mov 	dl, [Last_DOS_DiskNo]
    72 00006302 80FA02              <1> 	cmp 	dl, 2
    73 00006305 7706                <1> 	ja 	short _current_drive_c
    74 00006307 7406                <1> 	je 	short _current_drive_a
    75 00006309 30D2                <1> 	xor 	dl, dl ; A:
    76 0000630B EB02                <1> 	jmp 	short _current_drive_a
    77                              <1> 
    78                              <1> _current_drive_c:
    79 0000630D B202                <1> 	mov 	dl, 2 ; C:
    80                              <1> 
    81                              <1> _current_drive_a:
    82 0000630F 8815[535D0000]      <1> 	mov	[drv], dl
    83 00006315 BE[630D0100]        <1>         mov     esi, msg_CRLF_temp
    84 0000631A E8AE000000          <1> 	call 	print_msg
    85                              <1> 
    86 0000631F 8A15[535D0000]      <1> 	mov	dl, [drv]
    87                              <1> _default_drive_c:
    88 00006325 E81A0C0000          <1> 	call 	change_current_drive
    89 0000632A 731C                <1> 	jnc 	short _start_mainprog
    90                              <1> 
    91                              <1> _drv_not_ready_error: 
    92 0000632C BE[1E100100]        <1> 	mov 	esi, msgl_drv_not_ready
    93 00006331 E897000000          <1> 	call 	print_msg
    94                              <1>         ;jmp	_end_of_mainprog
    95                              <1> 
    96                              <1> 	; 20/01/2018
    97 00006336 B202                <1> 	mov	dl, 2
    98 00006338 3815[535D0000]      <1> 	cmp	[drv], dl
    99 0000633E 736B                <1> 	jnb	short _end_of_mainprog
   100 00006340 8815[535D0000]      <1> 	mov	[drv], dl
   101 00006346 EBDD                <1> 	jmp	short _default_drive_c
   102                              <1> 
   103                              <1> _start_mainprog:
   104                              <1> 	; 07/01/2017
   105                              <1> 	; 07/05/2016
   106                              <1> 	; 02/05/2016
   107                              <1> 	; 24/04/2016
   108                              <1> 	; Retro UNIX 386 v1, 'sys_init' (u0.s)
   109                              <1> 	; 23/06/2015
   110                              <1> 
   111                              <1> 	; 02/05/2016
   112                              <1> 	; 24/04/2016
   113 00006348 66B80100            <1> 	mov	ax, 1
   114 0000634C A2[B3030300]        <1> 	mov	[u.uno], al
   115 00006351 66A3[4E030300]      <1> 	mov	[mpid], ax
   116 00006357 66A3[20000300]      <1> 	mov	[p.pid], ax
   117 0000635D A2[B0000300]        <1> 	mov	[p.stat], al
   118 00006362 C605[A8030300]04    <1> 	mov	byte [u.quant], time_count  ; 07/01/2017
   119                              <1> 	;
   120 00006369 A1[C0580100]        <1> 	mov	eax, [k_page_dir]
   121 0000636E A3[B8030300]        <1> 	mov	[u.pgdir], eax ; reset
   122                              <1> 	;
   123 00006373 E85FE8FFFF          <1> 	call	allocate_page
   124 00006378 0F82A3000000        <1> 	jc	panic
   125 0000637E A3[B4030300]        <1> 	mov	[u.upage], eax ; user structure page	
   126 00006383 A3[C0000300]        <1> 	mov	[p.upage], eax
   127 00006388 E8C4E8FFFF          <1> 	call	clear_page
   128                              <1> 	;
   129                              <1> 	; 24/08/2015
   130 0000638D FE0D[5B030300]      <1> 	dec 	byte [sysflg] ; FFh = ready for system call
   131                              <1> 			      ; 0 = executing a system call
   132                              <1> 	; 13/04/2016
   133                              <1> 	; Clear Environment Variables Page/Area
   134 00006393 BF00300900          <1> 	mov	edi, Env_Page ; 93000h
   135 00006398 B980000000          <1> 	mov	ecx, Env_Page_Size / 4 	; 512/4  (4096/4)				 	  		 	  
   136 0000639D 31C0                <1> 	xor	eax, eax
   137 0000639F F3AB                <1> 	rep	stosd
   138                              <1> 
   139                              <1> 	; 14/04/2016
   140 000063A1 E8F5340000          <1>  	call	mainprog_startup_configuration
   141                              <1> 
   142 000063A6 E8DA0C0000          <1>         call    dos_prompt
   143                              <1>               
   144                              <1> _end_of_mainprog:
   145 000063AB BE[630D0100]        <1>         mov     esi, msg_CRLF_temp
   146 000063B0 E818000000          <1> 	call 	print_msg
   147 000063B5 BE[690D0100]        <1> 	mov 	esi, mainprog_Version
   148 000063BA E80E000000          <1> 	call 	print_msg
   149                              <1> 	; 24/01/2016
   150 000063BF 28E4                <1> 	sub	ah, ah
   151 000063C1 E859A8FFFF          <1> 	call	int16h ; call getch
   152 000063C6 E939ADFFFF          <1> 	jmp	cpu_reset
   153                              <1> 
   154 000063CB EBFE                <1> infinitiveloop: jmp short infinitiveloop
   155                              <1> 
   156                              <1> print_msg:
   157                              <1> 	; 13/05/2016
   158                              <1> 	; 04/01/2016
   159                              <1> 	; 01/07/2015
   160                              <1> 	; 13/03/2015 (Retro UNIX 386 v1)
   161                              <1> 	; 07/03/2014 (Retro UNIX 8086 v1)
   162                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX, ESI, EDI)
   163                              <1> 	;
   164 000063CD 8A3D[EE580100]      <1> 	mov	bh, [ACTIVE_PAGE] ; 04/01/2016 (ptty)
   165                              <1> 	;mov	bl, 07h ; Black background, light gray forecolor
   166                              <1> 
   167 000063D3 AC                  <1> 	lodsb
   168                              <1> pmsg1:
   169 000063D4 56                  <1> 	push 	esi
   170                              <1> 	;mov	bh, [ACTIVE_PAGE] ; 04/01/2016 (ptty)
   171 000063D5 B307                <1> 	mov	bl, 07h ; Black background, light gray forecolor
   172 000063D7 E8DFB8FFFF          <1> 	call 	_write_tty
   173 000063DC 5E                  <1> 	pop	esi
   174 000063DD AC                  <1> 	lodsb
   175 000063DE 20C0                <1> 	and 	al, al
   176 000063E0 75F2                <1> 	jnz 	short pmsg1
   177 000063E2 C3                  <1> 	retn
   178                              <1> 
   179                              <1> clear_screen:
   180                              <1> 	; 13/05/2016
   181                              <1> 	; 30/01/2016
   182                              <1> 	; 24/01/2016
   183                              <1> 	; 04/01/2016
   184 000063E3 0FB61D[EE580100]    <1> 	movzx	ebx, byte [ACTIVE_PAGE] ; video page number (0 to 7)
   185 000063EA 8AA3[335F0000]      <1> 	mov 	ah, [ebx+vmode] ; default = 03h (80x25 text)
   186 000063F0 80FC04              <1> 	cmp	ah, 4
   187 000063F3 7205                <1> 	jb	short cls1
   188 000063F5 80FC07              <1> 	cmp	ah, 7
   189 000063F8 7526                <1> 	jne	short vga_clear
   190                              <1> cls1:
   191                              <1> 	;mov	bh, bl
   192                              <1> 	;mov	bl, 7
   193 000063FA 3A25[225F0000]      <1> 	cmp	ah, [CRT_MODE] ; current video mode ? 
   194                              <1> 	;je	short cls2 ; yes (current video mode = 3)
   195                              <1> 	;;call	set_mode_3 ; set video mode to 3 (& clear screen)
   196                              <1> 	;;retn
   197                              <1> 	;jmp	set_mode_3
   198 00006400 0F85BFB8FFFF        <1> 	jne	set_mode_3
   199                              <1> cls2:
   200 00006406 88DF                <1> 	mov	bh, bl ; video page (0 to 7)
   201 00006408 B307                <1> 	mov	bl, 07h ; attribute to be used on blanked line
   202 0000640A 28C0                <1> 	sub 	al, al ; 0 =  entire window
   203 0000640C 6631C9              <1> 	xor 	cx, cx
   204 0000640F 66BA4F18            <1> 	mov 	dx, 184Fh
   205 00006413 E8FBB5FFFF          <1> 	call	_scroll_up ; 24/01/2016
   206                              <1> 	;
   207                              <1> 	;mov	bh, [ACTIVE_PAGE] ; video page number (0 to 7)
   208 00006418 6631D2              <1> 	xor 	dx, dx
   209 0000641B E831B9FFFF          <1> 	call	_set_cpos ; 24/01/2016 
   210                              <1> 	;retn
   211                              <1> vga_clear:
   212 00006420 C3                  <1> 	retn	
   213                              <1> 
   214                              <1> panic:
   215                              <1> 	; 13/05/2016 (TRDOS 386 = TRDOS v2)
   216                              <1> 	; 13/03/2015 (Retro UNIX 386 v1)
   217                              <1> 	; 07/03/2014 (Retro UNIX 8086 v1)
   218 00006421 BE[021A0100]        <1> 	mov 	esi, panic_msg
   219 00006426 E8A2FFFFFF          <1> 	call 	print_msg
   220                              <1> key_to_reboot:
   221                              <1>         ; 24/01/2016
   222 0000642B 28E4                <1>         sub     ah, ah
   223 0000642D E8EDA7FFFF          <1>         call    int16h ; call   getch
   224                              <1>         ; wait for a character from the current tty
   225                              <1> 	;
   226 00006432 B00A                <1> 	mov	al, 0Ah
   227 00006434 8A3D[EE580100]      <1> 	mov	bh, [ptty] ; [ACTIVE_PAGE]
   228 0000643A B307                <1> 	mov	bl, 07h ; Black background, 
   229                              <1> 			; light gray forecolor
   230 0000643C E87AB8FFFF          <1> 	call 	_write_tty
   231 00006441 E9BEACFFFF          <1> 	jmp	cpu_reset 
   232                              <1> 
   233                              <1> ctrlbrk:
   234                              <1> 	; 12/11/2015
   235                              <1> 	; 13/03/2015 (Retro UNIX 386 v1)
   236                              <1> 	; 06/12/2013 (Retro UNIX 8086 v1)
   237                              <1> 	;
   238                              <1> 	; INT 1Bh (control+break) handler		
   239                              <1> 	;
   240                              <1>       	; Retro Unix 8086 v1 feature only!
   241                              <1>       	;
   242 00006446 66833D[AA030300]00  <1> 	cmp 	word [u.intr], 0
   243 0000644E 7645                <1> 	jna 	short cbrk4
   244                              <1> cbrk0:
   245                              <1> 	; 12/11/2015
   246                              <1> 	; 06/12/2013
   247 00006450 66833D[AC030300]00  <1> 	cmp 	word [u.quit], 0
   248 00006458 743B                <1> 	jz	short cbrk4
   249                              <1> 	;
   250                              <1> 	; 20/09/2013	
   251 0000645A 6650                <1> 	push 	ax
   252 0000645C A0[EE580100]        <1> 	mov	al, [ptty]
   253                              <1> 	;
   254                              <1> 	; 12/11/2015
   255                              <1> 	;
   256                              <1> 	; ctrl+break (EOT, CTRL+D) from serial port
   257                              <1> 	; or ctrl+break from console (pseudo) tty
   258                              <1> 	; (!redirection!)
   259                              <1> 	;
   260 00006461 3C08                <1> 	cmp	al, 8 ; serial port tty nums > 7
   261 00006463 7211                <1>         jb      short cbrk1 ; console (pseudo) tty
   262                              <1> 	;	
   263                              <1> 	; Serial port interrupt handler sets [ptty]
   264                              <1> 	; to the port's tty number (as temporary).
   265                              <1> 	;
   266                              <1> 	; If active process is using a stdin or 
   267                              <1> 	; stdout redirection (by the shell),
   268                              <1>         ; console tty keyboard must be available
   269                              <1> 	; to terminate running process,
   270                              <1> 	; in order to prevent a deadlock. 
   271                              <1> 	;
   272 00006465 52                  <1> 	push	edx
   273 00006466 0FB615[B3030300]    <1> 	movzx	edx, byte [u.uno]
   274 0000646D 3A82[7F000300]      <1> 	cmp     al, [edx+p.ttyc-1] ; console tty (rw)
   275 00006473 5A                  <1> 	pop	edx
   276 00006474 7412                <1> 	je	short cbrk2
   277                              <1> cbrk1:
   278 00006476 FEC0                <1> 	inc 	al  ; [u.ttyp] : 1 based tty number
   279                              <1> 	; 06/12/2013
   280 00006478 3A05[94030300]      <1> 	cmp	al, [u.ttyp] ; recent open tty (r)
   281 0000647E 7408                <1> 	je	short cbrk2	
   282 00006480 3A05[95030300]      <1>         cmp     al, [u.ttyp+1] ; recent open tty (w)
   283 00006486 750B                <1> 	jne	short cbrk3	
   284                              <1> cbrk2:
   285                              <1> 	;; 06/12/2013
   286                              <1> 	;mov	ax, [u.quit]
   287                              <1> 	;and	ax, ax
   288                              <1> 	;jz	short cbrk3
   289                              <1> 	;
   290 00006488 6631C0              <1> 	xor	ax, ax ; 0
   291 0000648B 6648                <1> 	dec	ax
   292                              <1> 	; 0FFFFh = 'ctrl+brk' keystroke
   293 0000648D 66A3[AC030300]      <1> 	mov	[u.quit], ax
   294                              <1> cbrk3:
   295 00006493 6658                <1> 	pop	ax
   296                              <1> cbrk4:
   297 00006495 C3                  <1> 	retn
   298                              <1> 
   299                              <1> 
   300                              <1> ; 31/12/2017
   301                              <1> ; TRDOS 386 - 30/12/2017
   302                              <1> %define get_rtc_date RTC_40
   303                              <1> %define get_rtc_time RTC_20
   304                              <1> %define	set_rtc_date RTC_50
   305                              <1> %define set_rtc_time RTC_30	
   306                              <1> get_rtc_date_time:
   307                              <1> ; Retro UNIX 8086 v1 - UNIX.ASM (01/09/2014)
   308                              <1> ;epoch:
   309                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0)
   310                              <1> 	; 15/03/2015 (Retro UNIX 386 v1 - 32 bit version)
   311                              <1> 	; 09/04/2013 (Retro UNIX 8086 v1 - UNIX.ASM)
   312                              <1> 	; 'epoch' procedure prototype: 
   313                              <1> 	; 	            UNIXCOPY.ASM, 10/03/2013
   314                              <1> 	; 14/11/2012
   315                              <1> 	; unixboot.asm (boot file configuration)
   316                              <1> 	; version of "epoch" procedure in "unixproc.asm"
   317                              <1> 	; 21/7/2012
   318                              <1> 	; 15/7/2012
   319                              <1> 	; 14/7/2012		
   320                              <1> 	; Erdogan Tan - RETRO UNIX v0.1
   321                              <1> 	; compute current date and time as UNIX Epoch/Time
   322                              <1> 	; UNIX Epoch: seconds since 1/1/1970 00:00:00
   323                              <1> 	;
   324                              <1>         ;  ((Modified registers: EAX, EDX, ECX, EBX))  
   325                              <1> 	;
   326                              <1> 
   327 00006496 E8B0F5FFFF          <1> 	call 	get_rtc_time		; Return Current Time
   328 0000649B 86E9                <1>         xchg 	ch,cl
   329 0000649D 66890D[B4550100]    <1>         mov 	[hour], cx
   330 000064A4 86F2                <1>         xchg 	dh,dl
   331 000064A6 668915[B8550100]    <1>         mov 	[second], dx
   332                              <1> 	;
   333 000064AD E80AF6FFFF          <1>         call 	get_rtc_date		; Return Current Date
   334 000064B2 86E9                <1>         xchg 	ch,cl
   335 000064B4 66890D[AE550100]    <1>         mov 	[year], cx
   336 000064BB 86F2                <1>         xchg 	dh,dl
   337 000064BD 668915[B0550100]    <1>         mov 	[month], dx
   338                              <1> 	;
   339 000064C4 66B93030            <1> 	mov 	cx, 3030h
   340                              <1> 	;
   341 000064C8 A0[B4550100]        <1> 	mov 	al, [hour] ; Hour
   342                              <1>         	; AL <= BCD number)
   343 000064CD D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   344                              <1> 					; AH = AL / 10h
   345                              <1> 					; AL = AL MOD 10h
   346 000064CF D50A                <1>         aad 	; AX= AH*10+AL
   347 000064D1 A2[B4550100]        <1> 	mov 	[hour], al
   348 000064D6 A0[B5550100]        <1> 	mov 	al, [hour+1] ; Minute
   349                              <1>         	; AL <= BCD number)
   350 000064DB D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   351                              <1> 					; AH = AL / 10h
   352                              <1> 					; AL = AL MOD 10h
   353 000064DD D50A                <1>         aad 	; AX= AH*10+AL
   354 000064DF A2[B6550100]        <1> 	mov 	[minute], al
   355 000064E4 A0[B8550100]        <1> 	mov 	al, [second] ; Second
   356                              <1>         	; AL <= BCD number)
   357 000064E9 D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   358                              <1> 					; AH = AL / 10h
   359                              <1> 					; AL = AL MOD 10h
   360 000064EB D50A                <1>         aad 	; AX= AH*10+AL
   361 000064ED A2[B8550100]        <1> 	mov 	[second], al
   362 000064F2 66A1[AE550100]      <1> 	mov 	ax, [year] ; Year (century)
   363 000064F8 6650                <1>         push 	ax
   364                              <1> 	   	; AL <= BCD number)
   365 000064FA D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   366                              <1> 					; AH = AL / 10h
   367                              <1> 					; AL = AL MOD 10h
   368 000064FC D50A                <1>         aad 	; AX= AH*10+AL
   369 000064FE B464                <1> 	mov 	ah, 100
   370 00006500 F6E4                <1> 	mul 	ah
   371 00006502 66A3[AE550100]      <1> 	mov 	[year], ax
   372 00006508 6658                <1> 	pop	ax
   373 0000650A 88E0                <1> 	mov	al, ah
   374                              <1>         	; AL <= BCD number)
   375 0000650C D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   376                              <1> 					; AH = AL / 10h
   377                              <1> 					; AL = AL MOD 10h
   378 0000650E D50A                <1>         aad 	; AX= AH*10+AL
   379 00006510 660105[AE550100]    <1> 	add 	[year], ax
   380 00006517 A0[B0550100]        <1> 	mov 	al, [month] ; Month
   381                              <1>            	; AL <= BCD number)
   382 0000651C D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   383                              <1> 					; AH = AL / 10h
   384                              <1> 					; AL = AL MOD 10h
   385 0000651E D50A                <1>         aad 	; AX= AH*10+AL
   386 00006520 A2[B0550100]        <1> 	mov 	[month], al	
   387 00006525 A0[B1550100]        <1>         mov     al, [month+1]      	; Day
   388                              <1>            	; AL <= BCD number)
   389 0000652A D410                <1>         db 	0D4h,10h		; Undocumented inst. AAM
   390                              <1> 					; AH = AL / 10h
   391                              <1> 					; AL = AL MOD 10h
   392 0000652C D50A                <1>         aad 	; AX= AH*10+AL
   393 0000652E A2[B2550100]        <1>         mov     [day], al
   394                              <1> 	
   395 00006533 C3                  <1> 	retn	; 30/12/2017
   396                              <1> 
   397                              <1> epoch:
   398 00006534 E85DFFFFFF          <1> 	call	get_rtc_date_time ; TRDOS 386 - 30/12/2017
   399                              <1> 
   400                              <1> convert_to_epoch:
   401                              <1> 	; 31/12/2017 (TRDOS 386 = TRDOS v2.0)
   402                              <1> 	; 15/03/2015 (Retro UNIX 386 v1 - 32 bit modification)
   403                              <1> 	; 09/04/2013 (Retro UNIX 8086 v1)
   404                              <1> 	;
   405                              <1> 	; ((Modified registers: EAX, EDX, EBX)) 
   406                              <1> 	;
   407                              <1> 	; Derived from DALLAS Semiconductor
   408                              <1> 	; Application Note 31 (DS1602/DS1603)
   409                              <1> 	; 6 May 1998
   410 00006539 29C0                <1> 	sub 	eax, eax
   411 0000653B 66A1[AE550100]      <1> 	mov 	ax, [year]
   412 00006541 662DB207            <1> 	sub 	ax, 1970
   413 00006545 BA6D010000          <1> 	mov 	edx, 365
   414 0000654A F7E2                <1> 	mul 	edx
   415 0000654C 31DB                <1> 	xor 	ebx, ebx
   416 0000654E 8A1D[B0550100]      <1> 	mov 	bl, [month]
   417 00006554 FECB                <1> 	dec 	bl
   418 00006556 D0E3                <1> 	shl 	bl, 1
   419                              <1> 	;sub	edx, edx
   420 00006558 668B93[BA550100]    <1> 	mov 	dx, [EBX+DMonth]
   421 0000655F 8A1D[B2550100]      <1>         mov     bl, [day]
   422 00006565 FECB                <1> 	dec 	bl
   423 00006567 01D0                <1> 	add 	eax, edx
   424 00006569 01D8                <1> 	add 	eax, ebx
   425                              <1> 			; EAX = days since 1/1/1970
   426 0000656B 668B15[AE550100]    <1> 	mov 	dx, [year]
   427 00006572 6681EAB107          <1> 	sub 	dx, 1969
   428 00006577 66D1EA              <1> 	shr 	dx, 1
   429 0000657A 66D1EA              <1> 	shr 	dx, 1		
   430                              <1> 		; (year-1969)/4
   431 0000657D 01D0                <1> 	add 	eax, edx
   432                              <1> 			; + leap days since 1/1/1970
   433 0000657F 803D[B0550100]02    <1> 	cmp 	byte [month], 2	; if past february
   434 00006586 7610                <1> 	jna 	short cte1
   435 00006588 668B15[AE550100]    <1> 	mov 	dx, [year]
   436 0000658F 6683E203            <1> 	and 	dx, 3 ; year mod 4
   437 00006593 7503                <1> 	jnz 	short cte1		
   438                              <1> 			; and if leap year
   439 00006595 83C001              <1> 	add 	eax, 1 	; add this year's leap day (february 29)
   440                              <1> cte1: 			; compute seconds since 1/1/1970
   441 00006598 BA18000000          <1> 	mov 	edx, 24
   442 0000659D F7E2                <1> 	mul	edx
   443 0000659F 8A15[B4550100]      <1> 	mov 	dl, [hour]
   444 000065A5 01D0                <1> 	add 	eax, edx
   445                              <1> 		; EAX = hours since 1/1/1970 00:00:00
   446                              <1> 	;mov	ebx, 60
   447 000065A7 B33C                <1> 	mov	bl, 60
   448 000065A9 F7E3                <1> 	mul	ebx
   449 000065AB 8A15[B6550100]      <1> 	mov 	dl, [minute]
   450 000065B1 01D0                <1> 	add 	eax, edx
   451                              <1> 		; EAX = minutes since 1/1/1970 00:00:00
   452                              <1> 	;mov 	ebx, 60
   453 000065B3 F7E3                <1> 	mul	ebx
   454 000065B5 8A15[B8550100]      <1> 	mov 	dl, [second]
   455 000065BB 01D0                <1> 	add 	eax, edx
   456                              <1>  		; EAX -> seconds since 1/1/1970 00:00:00
   457 000065BD C3                  <1> 	retn
   458                              <1> 
   459                              <1> ;set_date_time:
   460                              <1> convert_from_epoch:
   461                              <1> 	; 31/12/2017 (v2.0.0)
   462                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0)
   463                              <1> 	; 15/03/2015 (Retro UNIX 386 v1 - 32 bit version)
   464                              <1> 	; 20/06/2013 (Retro UNIX 8086 v1)
   465                              <1> 	; 'convert_from_epoch' procedure prototype: 
   466                              <1> 	; 	            UNIXCOPY.ASM, 10/03/2013
   467                              <1> 	;
   468                              <1> 	; ((Modified registers: EAX, EDX, ECX, EBX))	
   469                              <1> 	;
   470                              <1> 	; Derived from DALLAS Semiconductor
   471                              <1> 	; Application Note 31 (DS1602/DS1603)
   472                              <1> 	; 6 May 1998
   473                              <1> 	;
   474                              <1> 	; INPUT:
   475                              <1> 	; EAX = Unix (Epoch) Time
   476                              <1> 	;
   477 000065BE 31D2                <1> 	xor 	edx, edx
   478 000065C0 B93C000000          <1> 	mov 	ecx, 60
   479 000065C5 F7F1                <1> 	div	ecx
   480                              <1> 	;mov 	[imin], eax   ; whole minutes
   481                              <1> 			  ; since 1/1/1970
   482 000065C7 668915[B8550100]    <1> 	mov 	[second], dx  ; leftover seconds
   483 000065CE 29D2                <1> 	sub 	edx, edx
   484 000065D0 F7F1                <1> 	div	ecx
   485                              <1> 	;mov 	[ihrs], eax   ; whole hours
   486                              <1> 	;		      ; since 1/1/1970
   487 000065D2 668915[B6550100]    <1> 	mov 	[minute], dx  ; leftover minutes
   488 000065D9 31D2                <1> 	xor	edx, edx
   489                              <1> 	;mov 	cx, 24
   490 000065DB B118                <1> 	mov 	cl, 24
   491 000065DD F7F1                <1> 	div	ecx
   492                              <1> 	;mov 	[iday], ax   ; whole days
   493                              <1> 			     ; since 1/1/1970
   494 000065DF 668915[B4550100]    <1> 	mov 	[hour], dx   ; leftover hours
   495 000065E6 05DB020000          <1> 	add 	eax, 365+366 ; whole day since
   496                              <1> 			     ; 1/1/1968 	
   497                              <1> 	;mov 	[iday], ax
   498 000065EB 50                  <1> 	push 	eax
   499 000065EC 29D2                <1> 	sub	edx, edx
   500 000065EE B9B5050000          <1> 	mov 	ecx, (4*365)+1 ; 4 years = 1461 days
   501 000065F3 F7F1                <1> 	div	ecx
   502 000065F5 59                  <1> 	pop 	ecx
   503                              <1> 	;mov 	[lday], ax   ; count of quadyrs (4 years)
   504 000065F6 6652                <1> 	push 	dx
   505                              <1> 	;mov 	[qday], dx   ; days since quadyr began
   506 000065F8 6683FA3C            <1> 	cmp 	dx, 31 + 29  ; if past feb 29 then
   507 000065FC F5                  <1> 	cmc		     ; add this quadyr's leap day
   508 000065FD 83D000              <1> 	adc 	eax, 0	     ; to # of qadyrs (leap days)
   509                              <1> 	;mov 	[lday], ax   ; since 1968			  
   510                              <1> 	;mov 	cx, [iday]
   511 00006600 91                  <1> 	xchg 	ecx, eax     ; ECX = lday, EAX = iday		  
   512 00006601 29C8                <1> 	sub 	eax, ecx     ; iday - lday
   513 00006603 B96D010000          <1> 	mov 	ecx, 365
   514 00006608 31D2                <1> 	xor	edx, edx
   515                              <1> 	; EAX = iday-lday, EDX = 0
   516 0000660A F7F1                <1> 	div	ecx
   517                              <1> 	;mov 	[iyrs], ax   ; whole years since 1968
   518                              <1> 	;jday = iday - (iyrs*365) - lday
   519                              <1> 	;mov [jday], dx      ; days since 1/1 of current year
   520                              <1> 	;add	eax, 1968
   521 0000660C 6605B007            <1> 	add 	ax, 1968     ; compute year
   522 00006610 66A3[AE550100]      <1> 	mov 	[year], ax
   523 00006616 6689D1              <1> 	mov 	cx, dx
   524                              <1> 	;mov 	dx, [qday]
   525 00006619 665A                <1> 	pop 	dx
   526 0000661B 6681FA6D01          <1> 	cmp 	dx, 365	     ; if qday <= 365 and qday >= 60	
   527 00006620 7709                <1> 	ja 	short cfe1   ; jday = jday +1
   528 00006622 6683FA3C            <1> 	cmp 	dx, 60       ; if past 2/29 and leap year then
   529 00006626 F5                  <1>         cmc		     ; add a leap day to the # of whole
   530 00006627 6683D100            <1> 	adc 	cx, 0        ; days since 1/1 of current year
   531                              <1> cfe1:			
   532                              <1> 	;mov 	[jday], cx
   533 0000662B 66BB0C00            <1> 	mov 	bx, 12       ; estimate month
   534 0000662F 66BA6E01            <1> 	mov 	dx, 366      ; mday, max. days since 1/1 is 365
   535 00006633 6683E003            <1> 	and 	ax, 11b      ; year mod 4 (and dx, 3) 
   536                              <1> cfe2:	; Month calculation  ; 0 to 11  (11 to 0)	
   537 00006637 6639D1              <1> 	cmp 	cx, dx       ; mday = # of days passed from 1/1
   538 0000663A 731D                <1> 	jnb 	short cfe3
   539 0000663C 664B                <1> 	dec 	bx           ; month = month - 1
   540 0000663E 66D1E3              <1> 	shl 	bx, 1 
   541 00006641 668B93[BA550100]    <1> 	mov 	dx, [EBX+DMonth] ; # elapsed days at 1st of month
   542 00006648 66D1EB              <1> 	shr 	bx, 1        ; bx = month - 1 (0 to 11)
   543 0000664B 6683FB01            <1> 	cmp	bx, 1        ; if month > 2 and year mod 4  = 0	
   544 0000664F 76E6                <1> 	jna 	short cfe2   ; then mday = mday + 1
   545 00006651 08C0                <1> 	or 	al, al       ; if past 2/29 and leap year then
   546 00006653 75E2                <1> 	jnz 	short cfe2   ; add leap day (to mday)
   547 00006655 6642                <1> 	inc 	dx           ; mday = mday + 1
   548 00006657 EBDE                <1> 	jmp 	short cfe2
   549                              <1> cfe3:
   550 00006659 6643                <1> 	inc 	bx	     ; -> bx = month, 1 to 12
   551 0000665B 66891D[B0550100]    <1> 	mov 	[month], bx
   552 00006662 6629D1              <1> 	sub 	cx, dx	     ; day = jday - mday + 1	
   553 00006665 6641                <1> 	inc 	cx 			  
   554 00006667 66890D[B2550100]    <1> 	mov 	[day], cx
   555                              <1> 	
   556                              <1> 	; eax, ebx, ecx, edx is changed at return
   557                              <1> 	; output ->
   558                              <1> 	; [year], [month], [day], [hour], [minute], [second]
   559                              <1> 
   560 0000666E C3                  <1> 	retn	; 31/12/2017 (TRDOS 386)
   561                              <1> 
   562                              <1> set_rtc_date_time:
   563                              <1> 	; 31/12/2017 (v2.0.0)
   564                              <1> 	; 30/12/2017 (TRDOS 386)
   565                              <1> 	; 15/03/2015 (Retro UNIX 386 v1 - 32 bit version)
   566                              <1> 	; 20/06/2013 (Retro UNIX 8086 v1)
   567 0000666F E80F000000          <1> 	call	set_date_bcd
   568                              <1> 	; Set real-time clock date
   569 00006674 E870F4FFFF          <1> 	call	set_rtc_date ; RTC_50
   570                              <1> 	; Set real-time clock time
   571 00006679 E832000000          <1> 	call	set_time_bcd
   572 0000667E E9F7F3FFFF          <1> 	jmp	set_rtc_time ; RTC_30	
   573                              <1> 
   574                              <1> ; 31/12/2017
   575                              <1> set_date_bcd:
   576 00006683 A0[AF550100]        <1>         mov     al, [year+1]
   577 00006688 D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   578 0000668A D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   579                              <1> 			     ; AL = AH * 10h + AL
   580 0000668C 88C5                <1> 	mov 	ch, al ; century (BCD)
   581 0000668E A0[AE550100]        <1> 	mov 	al, [year]
   582 00006693 D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   583 00006695 D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   584                              <1> 			     ; AL = AH * 10h + AL
   585 00006697 88C1                <1> 	mov 	cl, al ; year (BCD)
   586 00006699 A0[B0550100]        <1>         mov 	al, [month]
   587 0000669E D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   588 000066A0 D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   589                              <1> 			     ; AL = AH * 10h + AL
   590 000066A2 88C6                <1> 	mov 	dh, al ; month (BCD)
   591 000066A4 A0[B2550100]        <1> 	mov 	al, [day]
   592 000066A9 D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   593 000066AB D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   594                              <1> 			     ; AL = AH * 10h + AL
   595 000066AD 88C6                <1> 	mov 	dh, al ; day (BCD)
   596 000066AF C3                  <1> 	retn	; 30/12/2017
   597                              <1> 
   598                              <1> ; 31/12/2017
   599                              <1> set_time_bcd:
   600                              <1>         ; Read real-time clock time 
   601                              <1> 	; (get day light saving time bit status)
   602 000066B0 FA                  <1>  	cli
   603 000066B1 E885F5FFFF          <1> 	CALL	UPD_IPR 		; CHECK FOR UPDATE IN PROCESS
   604                              <1> 	; cf = 1 -> al = 0
   605 000066B6 7207                <1>         jc      short stime1
   606 000066B8 B00B                <1> 	MOV	AL,CMOS_REG_B		; ADDRESS ALARM REGISTER
   607 000066BA E897F5FFFF          <1> 	CALL	CMOS_READ		; READ CURRENT VALUE OF DSE BIT
   608                              <1> stime1:
   609 000066BF FB                  <1> 	sti
   610 000066C0 2401                <1> 	AND	AL,00000001B		; MASK FOR VALID DSE BIT
   611 000066C2 88C2                <1> 	MOV	DL,AL			; SET [DL] TO ZERO FOR NO DSE BIT
   612                              <1> 	; DL = 1 or 0 (day light saving time)
   613                              <1> 	;	
   614 000066C4 A0[B4550100]        <1> 	mov 	al, [hour]
   615 000066C9 D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   616 000066CB D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   617                              <1> 			     ; AL = AH * 10h + AL
   618 000066CD 88C5                <1> 	mov 	ch, al ; hour (BCD)
   619 000066CF A0[B6550100]        <1>         mov     al, [minute]
   620 000066D4 D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   621 000066D6 D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   622                              <1> 			     ; AL = AH * 10h + AL
   623 000066D8 88C1                <1> 	mov 	cl, al       ; minute (BCD)
   624 000066DA A0[B8550100]        <1>         mov     al, [second]
   625 000066DF D40A                <1> 	aam 	; ah = al / 10, al = al mod 10
   626 000066E1 D510                <1> 	db 	0D5h,10h     ; Undocumented inst. AAD
   627                              <1> 			     ; AL = AH * 10h + AL
   628 000066E3 88C6                <1> 	mov 	dh, al	     ; second (BCD)
   629 000066E5 C3                  <1> 	retn	; 30/12/2017
  2306                                  %include 'trdosk2.s' ; 04/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.2) - DRV INIT : trdosk2.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 30/08/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 04/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.14 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; TRDOS2.ASM (09/11/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; DRV_INIT.ASM (c) 2009-2011 Erdogan TAN  [26/09/2009] Last Update: 07/08/2011
    14                              <1> ;
    15                              <1> 
    16                              <1> ldrv_init: ; Logical Drive Initialization
    17                              <1> 	; 30/08/2020
    18                              <1> 	; 25/08/2020
    19                              <1> 	; 11/08/2020, 13/08/2020
    20                              <1> 	; 17/07/2020, 20/07/2020
    21                              <1> 	; 14/07/2020, 15/07/2020
    22                              <1> 	; 30/01/2018
    23                              <1> 	; 27/12/2017
    24                              <1> 	; 12/02/2016
    25                              <1> 	; 06/01/2016
    26                              <1> 	;  	('diskinit.inc', 'diskio.inc' integration)
    27                              <1> 	; 04/01/2016 (TRDOS 386 = TRDOS v2.0)
    28                              <1> 	; 07/08/2011
    29                              <1> 	; 20/09/2009
    30                              <1> 	; 2005
    31                              <1> 
    32                              <1> 	; 15/07/2020
    33                              <1> 	;movzx	ecx, byte [HF_NUM] ; number of fixed disks
    34                              <1> 	;cmp	cl, 1
    35                              <1> 	;jnb	short load_hd_partition_tables
    36                              <1> 
    37 000066E6 A0[5C590100]        <1> 	mov	al, [HF_NUM] ; number of fixed disks
    38 000066EB 20C0                <1> 	and 	al, al
    39 000066ED 7501                <1> 	jnz	short load_hd_partition_tables
    40                              <1> 
    41                              <1> 	; no any hard disks
    42 000066EF C3                  <1> 	retn			
    43                              <1> 
    44                              <1> load_hd_partition_tables:
    45                              <1> 	;mov	esi, [HDPM_TBL_VEC] ; primary master disk FDPT
    46                              <1> 	; 15/07/2020
    47 000066F0 BE[60590100]        <1> 	mov	esi, HDPM_TBL_VEC
    48 000066F5 BF[865D0100]        <1> 	mov 	edi, PTable_hd0
    49 000066FA B280                <1> 	mov 	dl, 80h
    50                              <1> 	; 15/07/2020
    51 000066FC A2[555D0000]        <1> 	mov	[hdc], al
    52                              <1> 	;xor	ecx, ecx ; 0
    53                              <1> load_next_hd_partition_table:
    54                              <1> 	; 20/07/2020
    55 00006701 31C9                <1> 	xor	ecx, ecx ; 0
    56                              <1> 	;push	ecx
    57 00006703 57                  <1> 	push	edi ; *
    58                              <1> 	;push	esi ; FDPT (+ DPTE) address
    59                              <1> 	; 15/07/2020
    60 00006704 AD                  <1> 	lodsd
    61 00006705 56                  <1> 	push	esi ; ** ; next FDPT (+ DPTE) address ptr
    62                              <1> 	
    63                              <1> 	;mov	al, [esi+20] ; DPTE offset 4
    64                              <1> 	;and	al, 40h ;  LBA bit (bit 6)
    65                              <1> 	;;shr	al, 6
    66                              <1> 	;mov 	[HD_LBA_yes], al
    67                              <1> 	
    68                              <1> 	; 15/07/2020
    69 00006706 8A4814              <1> 	mov	cl, [eax+20]
    70 00006709 80E140              <1> 	and	cl, 40h
    71 0000670C 880D[8A5E0100]      <1> 	mov	[HD_LBA_yes], cl
    72                              <1> 	
    73 00006712 E844040000          <1> 	call	load_masterboot
    74                              <1> 	;jc	short pass_pt_this_hard_disk
    75                              <1> 	; 13/08/2020
    76 00006717 0F828A000000        <1> 	jc	pass_pt_this_hard_disk
    77                              <1> 
    78 0000671D BB[445D0100]        <1> 	mov	ebx, PartitionTable
    79 00006722 89DE                <1> 	mov	esi, ebx
    80                              <1> 	;mov	ecx, 16
    81 00006724 B110                <1> 	mov	cl, 16
    82 00006726 F3A5                <1> 	rep 	movsd
    83 00006728 89DE                <1> 	mov 	esi, ebx 
    84                              <1> 	;mov 	byte [hdc], 4 ; 4 - partition index
    85                              <1> 	; 15/07/2020
    86 0000672A C605[8B5E0100]04    <1> 	mov	byte [PP_Counter], 4
    87                              <1> loc_validate_hdp_partition:
    88                              <1> 	;cmp 	byte [esi+ptFileSystemID], 0
    89                              <1> 	;jna	short loc_validate_next_hdp_partition2
    90                              <1> 	; 13/08/2020
    91 00006731 8A4604              <1> 	mov	al, [esi+ptFileSystemID]
    92 00006734 20C0                <1> 	and	al, al
    93 00006736 7457                <1> 	jz	short loc_validate_next_hdp_partition2
    94                              <1> 
    95 00006738 56                  <1> 	push	esi ; *** ; Masterboot partition table offset
    96 00006739 52                  <1> 	push	edx ; **** ; dl = Physical drive number
    97                              <1> 
    98                              <1> 	; 13/08/2020
    99 0000673A 3C05                <1> 	cmp	al, 05h  ; Extended partition CHS
   100 0000673C 7404                <1>  	je	short loc_set_ep_counter
   101 0000673E 3C0F                <1> 	cmp	al, 0Fh  ; Extended partition LBA
   102 00006740 7511                <1>  	jne	short loc_validate_next_hdp_partition0
   103                              <1> 	
   104                              <1> 	;;inc	byte [PP_Counter]
   105                              <1> 	; 15/07/2020
   106                              <1> 	;inc 	byte [EP_Counter] ; disk has valid partition(s)
   107                              <1> 
   108                              <1> loc_set_ep_counter:
   109                              <1> 	; 13/08/2020
   110 00006742 803D[8C5E0100]80    <1> 	cmp	byte [EP_Counter], 80h
   111 00006749 7342                <1> 	jnb	short loc_validate_next_hdp_partition1
   112                              <1> 
   113 0000674B 8815[8C5E0100]      <1> 	mov	byte [EP_Counter], dl ; disk drv has extd. part.
   114                              <1> 
   115 00006751 EB3A                <1> 	jmp	short loc_validate_next_hdp_partition1
   116                              <1> 
   117                              <1> loc_validate_next_hdp_partition0:
   118 00006753 31FF                <1> 	xor	edi, edi ; 0  
   119                              <1> 	; Input -> ESI = PartitionTable offset
   120                              <1> 	; DL = Hard disk drive number 
   121                              <1> 	; EDI = 0 -> Primary Partition
   122                              <1> 	; EDI > 0 -> Extended Partition's Start Sector   
   123 00006755 E885010000          <1> 	call 	validate_hd_fat_partition
   124 0000675A 730E                <1> 	jnc 	short loc_set_valid_hdp_partition_entry
   125                              <1> 
   126                              <1> 	;pop	edx
   127                              <1> 	;push	edx
   128 0000675C 8B1424              <1> 	mov	edx, [esp]  ; ****
   129 0000675F 8B742404            <1> 	mov	esi, [esp+4] ; *** ; 30/01/2018
   130 00006763 E8D1020000          <1> 	call	validate_hd_fs_partition
   131 00006768 7223                <1> 	jc	short loc_validate_next_hdp_partition1
   132                              <1> loc_set_valid_hdp_partition_entry:
   133 0000676A 8A0D[610D0100]      <1> 	mov 	cl, [Last_DOS_DiskNo] 
   134 00006770 80C141              <1> 	add 	cl, 'A'
   135                              <1> 	; ESI = Logical dos drive description table address
   136 00006773 880E                <1> 	mov	[esi+LD_Name], cl
   137                              <1> 	; 15/07/2020
   138 00006775 8A4602              <1> 	mov	al, [esi+LD_PhyDrvNo] ; Physical drive number
   139                              <1> 	;mov	al, [esp] ; ****
   140 00006778 2C7F                <1> 	sub	al, 7Fh
   141                              <1> 		; AL = 1 to 4	
   142 0000677A C0E002              <1> 	shl	al, 2 ; AL = 4 to 16
   143                              <1> 
   144 0000677D 8A15[8B5E0100]      <1> 	mov	dl, [PP_Counter]
   145                              <1> 
   146                              <1> 	;sub	al, [PP_Counter]
   147 00006783 28D0                <1> 	sub	al, dl ; [PP_Counter] ; 4 - partition index
   148                              <1> 
   149                              <1> 	; AL = Partition entry/index, 0 based
   150                              <1> 	;  0 -> hd 0, Partition Table offset = 0
   151                              <1> 	; 15 -> hd 3, Partition Table offset = 3
   152                              <1> 
   153                              <1> 	;mov	[esi+LD_PartitionEntry], al 
   154                              <1> 	
   155                              <1> 	; 15/07/2020
   156 00006785 B404                <1> 	mov	ah, 4
   157                              <1> 	;sub	ah, [PP_Counter]
   158 00006787 28D4                <1> 	sub	ah, dl
   159                              <1> 
   160                              <1> 	; AH = Primary partition index, 0 to 3 ; pt entry
   161                              <1> 	;		(4 to 7 for logical disk partitions)
   162                              <1> 
   163                              <1> 	;mov 	[esi+LD_DParamEntry], ah 
   164 00006789 6689467C            <1> 	mov 	[esi+LD_PartitionEntry], ax
   165                              <1> 
   166                              <1> loc_validate_next_hdp_partition1:
   167 0000678D 5A                  <1> 	pop 	edx ; **** ; dl = Physical drive number 
   168 0000678E 5E                  <1> 	pop	esi ; *** ; Masterboot partition table offset
   169                              <1> 
   170                              <1> loc_validate_next_hdp_partition2:
   171                              <1> 	; ESI = PartitionTable offset
   172                              <1> 	; DL = Hard/Fixed disk drive number
   173                              <1> 	
   174                              <1> 	;dec	byte [hdc] ; 4 - partition index
   175                              <1> 	;jz	short pass_pt_this_hard_disk
   176                              <1> 	; 15/07/2020
   177 0000678F FE0D[8B5E0100]      <1> 	dec	byte [PP_Counter] ; 4 - partition index
   178 00006795 7410                <1> 	jz	short pass_pt_this_hard_disk
   179                              <1> 	
   180 00006797 83C610              <1> 	add	esi, 16 ; 10h
   181 0000679A EB95                <1> 	jmp	short loc_validate_hdp_partition
   182                              <1> 
   183                              <1> loc_not_any_extd_partitions:
   184                              <1> 	; 15/07/2020
   185 0000679C C3                  <1> 	retn	
   186                              <1> 
   187                              <1> loc_next_hd_partition_table:
   188 0000679D FEC2                <1> 	inc	dl
   189                              <1> 	; 15/07/2020
   190                              <1> 	;add	esi, 32 ; next FDPT address
   191 0000679F 83C740              <1> 	add	edi, 64 ; next partition table destination
   192 000067A2 E95AFFFFFF          <1>         jmp     load_next_hd_partition_table
   193                              <1> 
   194                              <1> pass_pt_this_hard_disk:
   195                              <1> 	;pop	esi ; FDPT (+ DPTE) address
   196                              <1> 	; 15/07/2020
   197 000067A7 5E                  <1> 	pop	esi ; ** ; next FDPT (+ DPTE) address ptr
   198 000067A8 5F                  <1> 	pop	edi ; * ; Ptable_hd?
   199                              <1> 	;pop	ecx
   200                              <1> 	;loop	loc_next_hd_partition_table
   201 000067A9 FE0D[555D0000]      <1> 	dec	byte [hdc]
   202 000067AF 75EC                <1> 	jnz	short loc_next_hd_partition_table
   203                              <1> 
   204                              <1> 	;cmp	byte [PP_Counter], 1
   205                              <1> 	;jnb	short load_extended_dos_partitions
   206                              <1> 	;; Empty partition table
   207                              <1> 	;retn
   208                              <1> 
   209                              <1> 	; 11/08/2020
   210                              <1> 	; 17/07/2020
   211                              <1> check_extended_partitions:
   212                              <1> 	; 15/07/2020
   213                              <1> 	;cmp	byte [EP_Counter], 0
   214                              <1> 	;jna	short loc_not_any_extd_partitions
   215                              <1> 	; 13/08/2020
   216 000067B1 A0[8C5E0100]        <1> 	mov	al, [EP_Counter] ; 1st disk drv has extd partition
   217 000067B6 08C0                <1> 	or	al, al ; 0 ?
   218 000067B8 74E2                <1> 	jz	short loc_not_any_extd_partitions
   219                              <1> 
   220                              <1> load_extended_dos_partitions:
   221                              <1> 	;mov	byte [hdc], 80h
   222                              <1> 	; 13/08/2020
   223 000067BA A2[555D0000]        <1> 	mov	byte [hdc], al ; 1st disk drv has extd partition
   224                              <1> 	; 25/08/2020
   225 000067BF 2C80                <1> 	sub	al, 80h
   226 000067C1 740E                <1> 	jz	short loc_set_ext_ptable_hd0
   227 000067C3 C0E006              <1> 	shl	al, 6 ; * 64
   228 000067C6 0FB6F0              <1> 	movzx	esi, al
   229 000067C9 81C6[865D0100]      <1> 	add	esi, PTable_hd0
   230 000067CF EB05                <1> 	jmp 	short next_hd_extd_partition
   231                              <1> 
   232                              <1> 	; 25/08/2020
   233                              <1> loc_set_ext_ptable_hd0:
   234 000067D1 BE[865D0100]        <1> 	mov	esi, PTable_hd0
   235                              <1> 
   236                              <1> next_hd_extd_partition:
   237                              <1> 	; 17/07/2020
   238                              <1> 	;mov 	byte [EP_Counter], 0 ; Reset for each physical disk
   239                              <1> 	; 13/08/2020
   240                              <1> 	;mov	byte [LD_Counter], 0 ; Reset logical drive index
   241 000067D6 66C705[8C5E0100]00- <1> 	mov 	word [EP_Counter], 0 ; Reset EP index and LD index	
   241 000067DE 00                  <1>
   242                              <1> 
   243 000067DF 56                  <1> 	push	esi ; **** ; PTable_hd? offset
   244                              <1> 	
   245 000067E0 C605[8B5E0100]04    <1> 	mov 	byte [PP_Counter], 4 
   246                              <1> 				; set for each extd partition table
   247                              <1> 	;;mov	ecx, 4
   248                              <1> 	;mov	cl, 4
   249 000067E7 8A15[555D0000]      <1> 	mov	dl, [hdc]
   250                              <1> hd_check_fs_id_05h:
   251 000067ED 8A4604              <1> 	mov	al, [esi+ptFileSystemID]
   252 000067F0 3C05                <1> 	cmp	al, 05h ; Is it an extended dos partition ?
   253 000067F2 7411                <1> 	je	short loc_set_ep_start_sector ; yes
   254                              <1> hd_check_fs_id_0Fh:
   255 000067F4 3C0F                <1> 	cmp	al, 0Fh ; Is it an extended win4 (LBA mode) partition ?
   256 000067F6 740D                <1> 	je	short loc_set_ep_start_sector ; yes
   257                              <1> 
   258                              <1> continue_to_check_ep:
   259                              <1> 	;add	esi, 16
   260                              <1> 	;loop	hd_check_fs_id_05h
   261                              <1> 	; 15/07/2020
   262                              <1> 	;dec	cl
   263                              <1> 	;jz	short continue_check_ep_next_disk
   264 000067F8 FE0D[8B5E0100]      <1> 	dec	byte [PP_Counter] ; 4 --> 0
   265 000067FE 742D                <1> 	jz	short continue_check_ep_next_disk
   266 00006800 83C610              <1> 	add	esi, 16
   267 00006803 EBE8                <1> 	jmp	short hd_check_fs_id_05h
   268                              <1> 
   269                              <1> loc_set_ep_start_sector:
   270                              <1> 	; dl = [hdc] ; Drive number
   271                              <1> 	; 15/07/2020
   272 00006805 8B4E08              <1> 	mov	ecx, [esi+ptStartSector]
   273                              <1> 	; 30/08/2020
   274 00006808 890D[8E5E0100]      <1> 	mov	[MBR_EP_StartSector], ecx 
   275                              <1> 	; 20/07/2020
   276                              <1> loc_validate_hde_partition_next:
   277 0000680E 890D[925E0100]      <1> 	mov	[EP_StartSector], ecx ; Extended partition's start sector
   278 00006814 BB[865B0100]        <1>         mov	ebx, MasterBootBuff
   279 00006819 803D[8A5E0100]01    <1> 	cmp	byte [HD_LBA_yes], 1 ; LBA ready = Yes
   280 00006820 7227                <1> 	jb	short loc_hd_load_ep_05h ; cf = 1 ; 20/07/2020 
   281                              <1> 	; 11/08/2020
   282                              <1> 	; (BugFix for extended partition type 05h beyond CHS limit)
   283                              <1> 	; (Infact if extended partition starts at the beyond of CHS limit,
   284                              <1> 	;  it's partition ID must be 0Fh but they/somebodies had used 05h.)
   285                              <1> 	;cmp	al, 05h
   286                              <1> 	;je	short loc_hd_load_ep_05h
   287                              <1> loc_hd_load_ep_0Fh:
   288                              <1> 	; 04/01/2016
   289                              <1> 	;push	ecx
   290                              <1> 	; 15/07/2020
   291                              <1> 	;mov	ecx, [esi+ptStartSector] ; sector number
   292                              <1> 	;mov	ebx, MasterBootBuff ; buffer address
   293                              <1> 	; LBA read/write (with private LBA function) 
   294                              <1> 	;((Retro UNIX 386 v1 - DISK I/O code by Erdogan Tan))
   295                              <1> 	; dl = physical drive number (0,1, 80h, 81h, 82h, 83h)
   296                              <1> 	;mov	ah, 1Bh ; LBA read
   297                              <1> 	;mov	al, 1 ; sector count
   298 00006822 66B8011B            <1> 	mov	ax, 1B01h
   299 00006826 E802DAFFFF          <1> 	call	int13h
   300                              <1> 	;pop	ecx
   301                              <1> 	;jnc	short loc_hd_move_ep_table
   302                              <1> 	; 15/07/2020
   303 0000682B 732E                <1> 	jnc	short loc_validate_hde_partition
   304                              <1> 
   305                              <1> continue_check_ep_next_disk:
   306                              <1> 	; 15/07/2020
   307                              <1> 	;pop	edi ; PTable_ep?
   308 0000682D 5E                  <1> 	pop	esi ; **** ; PTable_hd?
   309 0000682E A0[5C590100]        <1> 	mov	al, [HF_NUM] ; number of hard disks
   310 00006833 047F                <1> 	add	al, 7Fh
   311 00006835 3805[555D0000]      <1> 	cmp	[hdc], al
   312 0000683B 730B                <1> 	jnb	short loc_validating_hd_partitions_ok
   313 0000683D 83C640              <1> 	add	esi, 64
   314                              <1> 	; 15/07/2020
   315                              <1> 	;add	edi, 64
   316 00006840 FE05[555D0000]      <1> 	inc	byte [hdc]
   317 00006846 EB8E                <1> 	jmp	short next_hd_extd_partition
   318                              <1> 
   319                              <1> loc_validating_hd_partitions_ok:
   320                              <1> 	; 15/07/2020
   321                              <1> 	;mov	al, [Last_DOS_DiskNo]
   322                              <1> loc_drv_init_retn:
   323 00006848 C3                  <1> 	retn
   324                              <1> 	
   325                              <1> loc_hd_load_ep_05h:
   326                              <1> 	; 20/07/2020 ('diskio.s', int13h, cf = 1 -> bugfix)
   327                              <1> 	;clc    ; (Bug: int13h would not clear carry flag bit, 
   328                              <1> 	;	; even if there would not be an error)
   329                              <1> 	;	; ((Fix: now, int13h procedure clears carry flag
   330                              <1> 	;	;  at the entrance of it.. 20/07/2020))
   331                              <1> 	; 15/07/2020
   332                              <1> 	;push	ecx 
   333 00006849 8A7601              <1> 	mov	dh, [esi+ptBeginHead]
   334 0000684C 668B4E02            <1>         mov     cx, [esi+ptBeginSector]
   335 00006850 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   336                              <1> 	;mov	ebx, MasterBootBuff
   337 00006854 E8D4D9FFFF          <1> 	call	int13h ; 20/07/2020
   338                              <1> 		       ; 'diskio.s' modification, 'clc'
   339                              <1> 	;pop	ecx  
   340 00006859 72D2                <1> 	jc	short continue_check_ep_next_disk
   341                              <1> 	; 15/07/2020
   342                              <1> 	;jmp	short loc_validate_hde_partition
   343                              <1> 
   344                              <1> 	; 15/07/2020
   345                              <1> ;loc_hd_move_ep_table:
   346                              <1> 	;;pop	edi
   347                              <1> 	;;push	edi  ; PTable_ep?
   348                              <1> 	;mov	edi, [esp]        
   349                              <1>         ;mov	esi, PartitionTable ; Extended
   350                              <1> 	;mov	ebx, esi
   351                              <1> 	;;mov	ecx, 16
   352                              <1> 	;mov	cl, 16
   353                              <1>        	;rep	movsd
   354                              <1> 	;mov	esi, ebx 
   355                              <1> ;loc_set_hde_sub_partition_count:
   356                              <1> 	;mov	byte [PP_Counter], 4
   357                              <1> 	;mov	byte [EP_Counter], 0
   358                              <1> 
   359                              <1> loc_validate_hde_partition:
   360                              <1> 	; 13/08/2020
   361                              <1> 	; 15/07/2020
   362                              <1> 	;mov	byte [PP_Counter], 4
   363 0000685B BE[445D0100]        <1> 	mov	esi, PartitionTable ; (in MasterBootBuff)
   364                              <1> 	; 13/08/2020
   365                              <1> 	;jmp	short get_minidisk_partition_entry
   366                              <1> 
   367                              <1> ;get_minidisk_partition_entry:
   368                              <1> ;	; 20/07/2020
   369                              <1> ;	cmp	byte [esi+ptFileSystemID], 0
   370                              <1> ;	ja	short loc_validate_minidisk_partition
   371                              <1> ;	; 13/08/2020
   372                              <1> ;	jmp	short continue_check_ep_next_disk
   373                              <1> 
   374                              <1> ;	; 11/08/2020
   375                              <1> ;get_minidisk_partition_entry_next:
   376                              <1> ;	; 13/08/2020
   377                              <1> ;	;dec 	byte [PP_Counter]
   378                              <1> ;	;jz	short continue_check_ep_next_disk
   379                              <1> ;	; 20/07/2020
   380                              <1> ;;get_minidisk_partition_entry_next:
   381                              <1> ;	; 13/08/2020
   382                              <1> ;	cmp	esi, PartitionTable+64 
   383                              <1> ;	jnb	short continue_check_ep_next_disk
   384                              <1> ;	
   385                              <1> ;	add 	esi, 16 ; 10h
   386                              <1> ;	;jmp	short get_minidisk_partition_entry
   387                              <1> 
   388                              <1> 	; 13/08/2020
   389                              <1> get_minidisk_partition_entry:
   390                              <1> 	; 20/07/2020
   391 00006860 807E0400            <1> 	cmp	byte [esi+ptFileSystemID], 0
   392 00006864 76C7                <1> 	jna	short continue_check_ep_next_disk ; 13/08/2020
   393                              <1> 
   394                              <1> loc_validate_minidisk_partition:
   395                              <1> 	; 13/08/2020
   396                              <1> 	; 20/07/2020
   397                              <1> 	;push	esi ; *** ; Extended partition table offset
   398                              <1> 
   399                              <1> 	; 13/08/2020
   400 00006866 FE05[8C5E0100]      <1> 	inc	byte [EP_Counter] ; current (sub partition) index 
   401                              <1> 				  ; in current extended partition
   402                              <1> 
   403 0000686C BF[925E0100]        <1> 	mov	edi, EP_StartSector
   404                              <1> 
   405                              <1> 	; Input -> ESI = PartitionTable offset
   406                              <1> 	; DL = Hard disk drive number   
   407                              <1> 	; EDI = Extended partition start sector pointer
   408 00006871 E869000000          <1> 	call	validate_hd_fat_partition
   409                              <1> 	;pop	ecx ; *
   410 00006876 7308                <1> 	jnc	short loc_set_valid_hde_partition_entry
   411                              <1> 			 ; jump down to deep !!!
   412                              <1> 
   413                              <1> 	;pop	esi ; *** ; Extended partition table offset
   414                              <1> 	; 13/08/2020
   415                              <1> 	;mov	esi, PartitionTable
   416                              <1> 
   417                              <1> 	; 11/08/2020
   418                              <1> 	; ESI = Extended partition table offset
   419 00006878 8A15[555D0000]      <1> 	mov	dl, [hdc]
   420                              <1> 
   421                              <1> 	;; DL = Hard disk drive number
   422                              <1> 	;dec	byte [PP_Counter]
   423                              <1> 	;jz	short continue_check_ep_next_disk
   424                              <1> 	;add 	esi, 16 ; 10h
   425                              <1> 	;mov	dl, [hdc]
   426                              <1> 	;jmp	short get_minidisk_partition_entry
   427                              <1> 
   428                              <1> 	; 11/08/2020
   429                              <1> 	;jmp	short get_minidisk_partition_entry_next
   430                              <1> 
   431                              <1> 	; 23/08/2020
   432 0000687E EB3D                <1> 	jmp	short validate_next_minidisk_partition_ok
   433                              <1> 
   434                              <1> 	; 17/07/2020
   435                              <1> 	;; jumping down to deep levels !!!
   436                              <1> 	; ((That is a pitty microsoft preferred ep table chain
   437                              <1> 	; instead of a single table as mbr partition table!?))
   438                              <1> 
   439                              <1> loc_set_valid_hde_partition_entry:
   440                              <1> 	; 15/07/2020
   441 00006880 A0[555D0000]        <1> 	mov	al, [hdc] ; Hard disk drive number (>=80h)
   442 00006885 88C2                <1> 	mov	dl, al ; mov dl, [hdc]
   443 00006887 2C7F                <1> 	sub	al, 7Fh
   444                              <1> 		    ; 1 to 4	
   445 00006889 C0E002              <1> 	shl	al, 2 ; 4 to 16
   446 0000688C 2A05[8B5E0100]      <1> 	sub	al, [PP_Counter] ; al - (4 - partition index)
   447                              <1> 			; (disk number * 4) + partition index
   448                              <1> 	
   449                              <1> 	; AL = Partition entry/index, 0 based
   450                              <1>         ;  0 -> hd 0, Partition Table offset = 0
   451                              <1>         ; 15 -> hd 3, Partition Table offset = 3
   452                              <1> 
   453                              <1> 	;mov	ah, 4 ; Logical dos partition (>= 4)
   454                              <1> 	;add	ah, [EP_Counter]
   455                              <1> 		; Logical disk partition index = 4 to 7
   456                              <1> 		; (Primary disk partition index = 0 to 3)
   457                              <1> 
   458                              <1> 	; 13/08/2020
   459 00006892 8A25[8D5E0100]      <1> 	mov	ah, [LD_Counter] ; Logical drive index number
   460                              <1> 				; (in current extended partition)
   461 00006898 80C404              <1> 	add	ah, 4 ; 4 to 7
   462                              <1> 	
   463                              <1> 	; 15/07/2020
   464                              <1> 	; CX -> AX
   465                              <1> 	;; 06/01/2016 (TRDOS v2.0)
   466                              <1> 	;; BUGFIX *
   467                              <1> 	;;mov	[esi+LD_PartitionEntry], cl 
   468                              <1> 	;;mov	[esi+LD_DParamEntry], ch 
   469                              <1> 	;mov	[esi+LD_PartitionEntry], cx 
   470 0000689B 6689467C            <1> 	mov	[esi+LD_PartitionEntry], ax 	
   471                              <1> 
   472 0000689F 8A0D[610D0100]      <1> 	mov	cl, [Last_DOS_DiskNo] 
   473 000068A5 80C141              <1> 	add	cl, 'A'
   474 000068A8 880E                <1> 	mov	[esi+LD_Name], cl
   475                              <1> 
   476                              <1> 	; 17/07/2020
   477                              <1> 	;cmp	cl, 'Z'
   478                              <1> 	;jb	short logical_drive_count_ok_for_next
   479                              <1> 	;pop	esi ; ***
   480                              <1> 	;pop	esi ; ****
   481                              <1> 	;retn
   482                              <1> 
   483                              <1> ;logical_drive_count_ok_for_next:
   484                              <1> 
   485                              <1> 	;; 15/07/2020
   486                              <1> 	;inc	byte [EP_Counter]
   487                              <1> 	; 13/08/2020
   488 000068AA FE05[8D5E0100]      <1> 	inc	byte [LD_Counter]	
   489                              <1> 
   490                              <1> 	;mov	dl, [hdc]
   491                              <1> 
   492                              <1> 	; 17/07/2020
   493                              <1> 	;; Now, 
   494                              <1> 	;; we are swimming in deep of an extended partition !!!
   495                              <1> 	; (! sub or chained extended partition tables !)
   496                              <1> 	; ((Logical dos partitions in extended partition were called
   497                              <1> 	;  as 'mini disk partition' in msdos 6.0 source code.))
   498                              <1> 
   499                              <1> validate_next_minidisk_partition:
   500                              <1> 	; 13/08/2020
   501                              <1> 	;pop	esi ; *** ; Extended partition table offset
   502                              <1> 
   503                              <1> 	; 17/07/2020
   504                              <1> 	;cmp	byte [EP_Counter], 4
   505                              <1> 	; 13/08/2020
   506 000068B0 803D[8D5E0100]04    <1> 	cmp	byte [LD_Counter], 4 ; maximum 4 logical disks
   507                              <1> 				     ; per extended partition
   508 000068B7 0F8370FFFFFF        <1> 	jnb	continue_check_ep_next_disk
   509                              <1> 
   510                              <1> validate_next_minidisk_partition_ok:
   511                              <1> 	; 13/08/2020
   512                              <1> 	;dec	byte [PP_Counter] ; 4 --> 0
   513                              <1> 	;jz	continue_check_ep_next_disk
   514                              <1> 	
   515                              <1> 	;cmp	esi, PartitionTable+64 
   516                              <1> 	;jnb	continue_check_ep_next_disk
   517                              <1> 
   518                              <1> 	;add	esi, 16
   519                              <1> 	; 13/08/2020
   520 000068BD BE[545D0100]        <1> 	mov	esi, PartitionTable+16
   521                              <1> 
   522                              <1> 	; 20/07/2020
   523 000068C2 8A4604              <1> 	mov	al, [esi+ptFileSystemID]
   524                              <1> 
   525                              <1> 	; 20/07/2020
   526 000068C5 3C05                <1> 	cmp	al, 05h ; Is it an extended dos partition ?
   527 000068C7 7408                <1> 	je	short loc_minidisk_next_ep_lba_chs ; 17/07/2020
   528 000068C9 3C0F                <1> 	cmp	al, 0Fh ; Is it an extended win4 (LBA mode) partition ?
   529 000068CB 0F855CFFFFFF        <1> 	jne	continue_check_ep_next_disk ; AL must be 0 here
   530                              <1> 					; (when it is not 05h or 0Fh)
   531                              <1> 					; If AL is not ZERO -> EP Bug!
   532                              <1> 					; (!Microsoft DOS convention!)
   533                              <1> loc_minidisk_next_ep_lba_chs:
   534                              <1> 	; 17/07/2020
   535 000068D1 8B4E08              <1> 	mov	ecx, [esi+ptStartSector] ; relative start sector number
   536                              <1> 	;add	ecx, [EP_StartSector]
   537                              <1> 	; 30/08/2020	
   538 000068D4 030D[8E5E0100]      <1> 	add	ecx, [MBR_EP_StartSector] 
   539                              <1> 	; 20/07/2020
   540 000068DA E92FFFFFFF          <1> 	jmp	loc_validate_hde_partition_next
   541                              <1> 
   542                              <1> validate_hd_fat_partition:
   543                              <1> 	; 17/07/2020
   544                              <1> 	; 15/07/2020
   545                              <1> 	;	(optimization)
   546                              <1> 	; 14/07/2020
   547                              <1> 	;	(fat16 -big- partition search bugfix)
   548                              <1> 	; 27/12/2017
   549                              <1> 	; 12/02/2016
   550                              <1> 	; 07/01/2016 (TRDOS 386 = TRDOS v2.0)
   551                              <1> 	; 07/08/2011
   552                              <1> 	; 23/07/2011
   553                              <1> 	; Input
   554                              <1> 	;   DL = Hard/Fixed Disk Drive Number
   555                              <1> 	;   ESI = PartitionTable offset
   556                              <1> 	;   EDI = Extend. Part. Start Sector Pointer
   557                              <1> 	;   EDI = 0 -> Primary Partition 
   558                              <1> 	;   byte [Last_DOS_DiskNo]
   559                              <1>  	; Output
   560                              <1> 	;  cf=0 -> Validated
   561                              <1> 	;   ESI = Logical dos drv desc. table
   562                              <1> 	;   EBX = FAT boot sector buffer
   563                              <1> 	;   byte [Last_DOS_DiskNo]
   564                              <1> 	;  cf=1 -> Not a valid FAT partition
   565                              <1> 	; EAX, EDX, ECX, EDI -> changed 
   566                              <1> 	
   567                              <1> 	;mov 	esi, PartitionTable
   568 000068DF 8A6604              <1> 	mov 	ah, [esi+ptFileSystemID]
   569 000068E2 B002                <1> 	mov	al, 2 ; 27/12/2017
   570 000068E4 80FC06              <1> 	cmp 	ah, 06h ; FAT16 CHS partition (>=32MB)
   571                              <1> 	; 12/02/2016
   572                              <1> 	;;jb	short loc_not_a_valid_fat_partition2
   573                              <1>  	;jnb	short vhdp_FAT16_32
   574                              <1> 	; 14/07/2020 (BugFix)
   575 000068E7 7711                <1> 	ja	short vhdp_FAT16_32
   576 000068E9 7425                <1> 	je	short loc_set_valid_hd_partition_params
   577                              <1> 
   578                              <1> vhdp_FAT12_16:
   579                              <1> 	; 27/12/2017
   580 000068EB FEC8                <1> 	dec	al ; mov al, 1
   581 000068ED 38C4                <1> 	cmp	ah, al ; 1 ; FAT12 partition
   582 000068EF 741F                <1> 	je	short loc_set_valid_hd_partition_params
   583                              <1> 	;
   584 000068F1 FEC0                <1> 	inc	al ; mov al, 2
   585 000068F3 80FC04              <1> 	cmp	ah, 04h ; FAT16 CHS partition (< 32MB)
   586 000068F6 7418                <1> 	je	short loc_set_valid_hd_partition_params
   587                              <1> 	
   588                              <1> 	; 15/07/2020
   589                              <1> 	; (ah = 05h, 02h or 03h)
   590                              <1> loc_not_a_valid_fat_partition1:
   591 000068F8 F9                  <1> 	stc
   592                              <1> 	; cf=1
   593 000068F9 C3                  <1> 	retn
   594                              <1> 
   595                              <1> vhdp_FAT16_32:
   596                              <1> 	; 15/07/2020
   597                              <1> 	;mov	al, 3
   598 000068FA FEC0                <1> 	inc	al
   599 000068FC 80FC0C              <1> 	cmp	ah, 0Ch ; FAT32 LBA partition
   600 000068FF 740F                <1> 	je	short loc_set_valid_hd_partition_params
   601 00006901 7706                <1> 	ja	short vhdp_check_FAT16_lba
   602                              <1> 
   603                              <1> vhdp_check_FAT32_chs:
   604 00006903 80FC0B              <1> 	cmp	ah, 0Bh ; FAT32 CHS partition 
   605 00006906 7408                <1> 	je	short loc_set_valid_hd_partition_params
   606                              <1> 	;jne	short loc_not_a_valid_fat_partition1
   607                              <1> 
   608                              <1> 	;stc
   609                              <1> loc_not_a_valid_fat_partition2:
   610 00006908 C3                  <1> 	retn
   611                              <1> 
   612                              <1> vhdp_check_FAT16_lba:
   613 00006909 80FC0E              <1> 	cmp	ah, 0Eh ; FAT16 LBA partition
   614 0000690C 75EA                <1> 	jne	short loc_not_a_valid_fat_partition1
   615                              <1> 
   616                              <1> 	;mov	al, 2
   617 0000690E FEC8                <1> 	dec	al
   618                              <1> 
   619                              <1> loc_set_valid_hd_partition_params:
   620                              <1> 	; 15/07/2020
   621                              <1> 	;inc 	byte [Last_DOS_DiskNo] ; > 1
   622                              <1> 	;
   623 00006910 31DB                <1> 	xor	ebx, ebx
   624 00006912 8A3D[610D0100]      <1> 	mov	bh, [Last_DOS_DiskNo] ; * 256	
   625 00006918 FEC7                <1> 	inc	bh ; 15/07/2020
   626 0000691A 81C300010900        <1> 	add	ebx, Logical_DOSDisks
   627                              <1> 	;
   628 00006920 C6430102            <1> 	mov	byte [ebx+LD_DiskType], 2
   629 00006924 885302              <1> 	mov	byte [ebx+LD_PhyDrvNo], dl
   630                              <1> 	;mov	byte [ebx+LD_FATType], al ; 2 or 3
   631                              <1> 	;mov	byte [ebx+LD_FSType], ah ; 06h, 0Eh, 0Bh, 0Ch
   632 00006927 66894303            <1> 	mov	word [ebx+LD_FATType], ax
   633                              <1> 	;
   634 0000692B 8B4E08              <1> 	mov	ecx, [esi+ptStartSector]
   635 0000692E 09FF                <1> 	or	edi, edi 
   636 00006930 7402                <1> 	jz	short pass_hd_FAT_ep_start_sector_adding
   637                              <1> loc_add_hd_FAT_ep_start_sector:
   638                              <1> 	; 17/07/2020
   639 00006932 030F                <1> 	add	ecx, [edi]
   640                              <1> pass_hd_FAT_ep_start_sector_adding:
   641 00006934 894B6C              <1> 	mov	[ebx+LD_StartSector], ecx
   642                              <1> loc_hd_FAT_logical_drv_init:
   643 00006937 89DD                <1> 	mov	ebp, ebx
   644                              <1> 	;mov	dl, [ebx+LD_PhyDrvNo]
   645 00006939 A0[8A5E0100]        <1> 	mov	al, [HD_LBA_yes] ; 07/01/2016
   646 0000693E 884305              <1> 	mov	[ebx+LD_LBAYes], al
   647 00006941 BB[965E0100]        <1> 	mov	ebx, DOSBootSectorBuff ; buffer address
   648 00006946 08C0                <1> 	or	al, al
   649 00006948 740C                <1> 	jz	short loc_hd_FAT_drv_init_load_bs_chs
   650                              <1> loc_hd_FAT_drv_init_load_bs_lba:
   651                              <1> 	; DL = Physical drive number
   652                              <1>    	;mov	ecx, [esi+ptStartSector] ; sector number
   653                              <1> 	;mov	ebx, DOSBootSectorBuff ; buffer address
   654                              <1> 	; LBA read/write (with private LBA function) 
   655                              <1> 	;((Retro UNIX 386 v1 - DISK I/O code by Erdogan Tan))
   656                              <1> 	; dl = physical drive number (0,1, 80h, 81h, 82h, 83h)
   657 0000694A B41B                <1> 	mov	ah, 1Bh ; LBA read
   658 0000694C B001                <1> 	mov	al, 1 ; sector count
   659 0000694E E8DAD8FFFF          <1> 	call	int13h
   660 00006953 7313                <1> 	jnc	short loc_hd_drv_FAT_boot_validation
   661                              <1> loc_not_a_valid_fat_partition3:
   662 00006955 C3                  <1> 	retn
   663                              <1> loc_hd_FAT_drv_init_load_bs_chs:
   664 00006956 8A7601              <1> 	mov	dh, [esi+ptBeginHead]
   665 00006959 668B4E02            <1> 	mov	cx, [esi+ptBeginSector]
   666 0000695D 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   667                              <1> 	;mov	ebx, DOSBootSectorBuff
   668 00006961 E8C7D8FFFF          <1> 	call	int13h
   669 00006966 72ED                <1> 	jc	short loc_not_a_valid_fat_partition3
   670                              <1> loc_hd_drv_FAT_boot_validation:
   671                              <1> 	;mov	esi, DOSBootSectorBuff
   672 00006968 89DE                <1> 	mov	esi, ebx
   673 0000696A 6681BEFE01000055AA  <1> 	cmp	word [esi+BS_Validation], 0AA55h
   674 00006973 7512                <1> 	jne	short loc_not_a_valid_fat_partition4
   675 00006975 807E15F8            <1> 	cmp	byte [esi+BPB_Media], 0F8h
   676 00006979 750C                <1> 	jne	short loc_not_a_valid_fat_partition4
   677                              <1> 
   678                              <1> 	; 27/12/2017
   679 0000697B 807D0303            <1> 	cmp	byte [ebp+LD_FATType], 3
   680 0000697F 7508                <1> 	jne	short loc_hd_FAT16_BPB
   681                              <1> 
   682                              <1> loc_hd_drv_FAT32_boot_validation:
   683 00006981 807E4229            <1> 	cmp	byte [esi+BS_FAT32_BootSig], 29h
   684 00006985 7416                <1> 	je	short loc_hd_FAT32_BPB
   685                              <1> 
   686                              <1> loc_not_a_valid_fat_partition4:
   687 00006987 F9                  <1> 	stc
   688 00006988 C3                  <1> 	retn
   689                              <1> 
   690                              <1> loc_hd_FAT16_BPB:
   691 00006989 807E2629            <1> 	cmp	byte [esi+BS_BootSig], 29h
   692 0000698D 75F8                <1> 	jne	short loc_not_a_valid_fat_partition4
   693                              <1> 
   694 0000698F 66837E1600          <1> 	cmp	word [esi+BPB_FATSz16], 0
   695 00006994 7607                <1> 	jna	short loc_hd_big_FAT16_BPB
   696 00006996 B920000000          <1> 	mov	ecx, 32
   697 0000699B EB05                <1> 	jmp	short loc_hd_move_FAT_BPB
   698                              <1> 
   699                              <1> loc_hd_FAT32_BPB:
   700                              <1> 	;cmp	word [esi+BPB_FATSz16], 0
   701                              <1> 	;ja	short loc_not_a_valid_fat_partition4
   702                              <1> loc_hd_big_FAT16_BPB:
   703 0000699D B92D000000          <1> 	mov	ecx, 45
   704                              <1> 	
   705                              <1> loc_hd_move_FAT_BPB:
   706 000069A2 89EF                <1> 	mov 	edi, ebp
   707                              <1> 	;mov	esi, ebx ; Boot sector
   708 000069A4 57                  <1> 	push	edi
   709 000069A5 83C706              <1> 	add	edi, LD_BPB
   710 000069A8 F366A5              <1> 	rep	movsw 
   711 000069AB 5E                  <1> 	pop	esi
   712 000069AC 0FB74614            <1> 	movzx	eax, word [esi+LD_BPB+BPB_RsvdSecCnt]
   713 000069B0 03466C              <1> 	add	eax, [esi+LD_StartSector]
   714 000069B3 894660              <1> 	mov	[esi+LD_FATBegin], eax
   715 000069B6 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3
   716 000069BA 7224                <1> 	jb	short loc_set_FAT16_RootDirLoc
   717                              <1> loc_set_FAT32_RootDirLoc:
   718 000069BC 8B462A              <1> 	mov	eax, [esi+LD_BPB+BPB_FATSz32]
   719 000069BF 0FB65E16            <1>         movzx	ebx, byte [esi+LD_BPB+BPB_NumFATs]
   720 000069C3 F7E3                <1> 	mul	ebx
   721 000069C5 034660              <1> 	add	eax, [esi+LD_FATBegin]
   722                              <1> loc_set_FAT32_data_begin:
   723 000069C8 894668              <1> 	mov	[esi+LD_DATABegin], eax
   724 000069CB 894664              <1> 	mov	[esi+LD_ROOTBegin], eax
   725                              <1> 	; If Root Directory Cluster <> 2 then
   726                              <1> 	; change the beginning sector value 
   727                              <1> 	; of the root dir by adding sector offset.
   728 000069CE 8B4632              <1> 	mov	eax, [esi+LD_BPB+BPB_RootClus]
   729 000069D1 83E802              <1> 	sub	eax, 2
   730 000069D4 7435                <1> 	jz	short short loc_set_32bit_FAT_total_sectors  
   731                              <1> 	;movzx	ebx, byte [esi+LD_BPB+BPB_SecPerClust]
   732 000069D6 8A5E13              <1> 	mov	bl, [esi+LD_BPB+BPB_SecPerClust] 
   733 000069D9 F7E3                <1> 	mul	ebx
   734 000069DB 014664              <1> 	add	[esi+LD_ROOTBegin], eax
   735 000069DE EB2B                <1> 	jmp	short loc_set_32bit_FAT_total_sectors
   736                              <1> 	;
   737                              <1> loc_set_FAT16_RootDirLoc:
   738 000069E0 0FB64616            <1> 	movzx	eax, byte [esi+LD_BPB+BPB_NumFATs]
   739 000069E4 0FB7561C            <1> 	movzx	edx, word [esi+LD_BPB+BPB_FATSz16]
   740 000069E8 F7E2                <1> 	mul	edx
   741 000069EA 034660              <1> 	add	eax, [esi+LD_FATBegin]  
   742 000069ED 894664              <1> 	mov	[esi+LD_ROOTBegin], eax
   743                              <1> loc_set_FAT16_data_begin:
   744 000069F0 894668              <1> 	mov	[esi+LD_DATABegin], eax 
   745                              <1> 	;mov	eax, 20h  ; Size of a directory entry
   746                              <1> 	;;movzx	edx, word [esi+LD_BPB+BPB_RootEntCnt]
   747                              <1>         ;mov     dx, [esi+LD_BPB+BPB_RootEntCnt]
   748                              <1>         ;mul	edx
   749                              <1> 	;;mov	ecx, 511
   750                              <1> 	;mov	cx, 511
   751                              <1> 	;add	eax, ecx
   752                              <1> 	;inc	ecx ; 512
   753                              <1> 	;div	ecx
   754                              <1> 	; 14/07/2020
   755 000069F3 0FB74617            <1> 	movzx	eax, word [esi+LD_BPB+BPB_RootEntCnt]
   756 000069F7 6683C00F            <1> 	add	ax, 15
   757 000069FB 66C1E804            <1> 	shr	ax, 4 ; / 16 ; (16 entries per sector)
   758 000069FF 014668              <1> 	add	[esi+LD_DATABegin], eax
   759                              <1> 	;movzx	eax, word [esi+LD_BPB+BPB_TotalSec16]
   760 00006A02 668B4619            <1> 	mov	ax, [esi+LD_BPB+BPB_TotalSec16]
   761 00006A06 6685C0              <1> 	test	ax, ax
   762                              <1> 	;jz	short loc_set_32bit_FAT_total_sectors
   763                              <1> ;loc_set_16bit_FAT_total_sectors:
   764                              <1> 	;mov	[esi+LD_TotalSectors], eax
   765                              <1> 	;jmp	short loc_set_hd_FAT_cluster_count
   766                              <1> 	; 14/07/2020
   767 00006A09 7503                <1> 	jnz	short loc_set_hd_FAT_cluster_count
   768                              <1> loc_set_32bit_FAT_total_sectors:
   769 00006A0B 8B4626              <1> 	mov	eax, [esi+LD_BPB+BPB_TotalSec32]
   770                              <1> 	;mov	[esi+LD_TotalSectors], eax
   771                              <1> loc_set_hd_FAT_cluster_count:
   772 00006A0E 894670              <1> 	mov	[esi+LD_TotalSectors], eax ; 14/07/2020
   773 00006A11 8B5668              <1> 	mov	edx, [esi+LD_DATABegin]
   774 00006A14 2B566C              <1> 	sub	edx, [esi+LD_StartSector]
   775 00006A17 29D0                <1> 	sub	eax, edx
   776 00006A19 31D2                <1> 	xor	edx, edx ; 0
   777 00006A1B 0FB64E13            <1>         movzx   ecx, byte [esi+LD_BPB+BPB_SecPerClust]
   778 00006A1F F7F1                <1>         div	ecx 
   779 00006A21 894678              <1> 	mov	[esi+LD_Clusters], eax
   780                              <1> 	; Maximum Valid Cluster Number= EAX +1
   781                              <1> 	; with 2 reserved clusters= EAX +2
   782                              <1> loc_set_hd_FAT_fs_free_sectors:
   783                              <1> 	;mov	dword [esi+LD_FreeSectors], 0
   784 00006A24 E855010000          <1> 	call	get_free_FAT_sectors
   785 00006A29 720D                <1> 	jc	short loc_validate_hd_FAT_partition_retn
   786 00006A2B 894674              <1> 	mov	[esi+LD_FreeSectors], eax
   787 00006A2E C6467E06            <1> 	mov	byte [esi+LD_MediaChanged], 6  ; Volume Name Reset
   788                              <1> 
   789                              <1> 	; 15/07/2020
   790 00006A32 FE05[610D0100]      <1> 	inc 	byte [Last_DOS_DiskNo] ; > 1
   791                              <1> 
   792                              <1> 	;mov	cl, [Last_DOS_DiskNo] 
   793                              <1> 	;add	cl, 'A'
   794                              <1> 	;mov	[esi+LD_FS_Name], cl
   795                              <1> 
   796                              <1> loc_validate_hd_FAT_partition_retn:         
   797 00006A38 C3                  <1> 	retn
   798                              <1> 
   799                              <1> validate_hd_fs_partition:
   800                              <1> 	; 03/02/2018
   801                              <1> 	; 09/12/2017
   802                              <1> 	; 13/02/2016
   803                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
   804                              <1> 	; 29/01/2011
   805                              <1> 	; 23/07/2011
   806                              <1> 	; Input
   807                              <1> 	;   DL = Hard/Fixed Disk Drive Number
   808                              <1> 	;   ESI = PartitionTable offset
   809                              <1> 	;   byte [Last_DOS_DiskNo]
   810                              <1> 	; Output
   811                              <1> 	;  cf=0 -> Validated
   812                              <1> 	;   ESI = Logical dos drv desc. table
   813                              <1> 	;   EBX = Singlix FS boot sector buffer
   814                              <1> 	;   byte [Last_DOS_DiskNo]
   815                              <1> 	;  cf=1 -> Not a valid 'Singlix FS' partition
   816                              <1> 	; EAX, EDX, ECX, EDI -> changed 
   817                              <1> 
   818                              <1> 	;mov	esi, PartitionTable
   819 00006A39 8A6604              <1> 	mov	ah, [esi+ptFileSystemID]
   820 00006A3C 80FCA1              <1> 	cmp	ah, 0A1h ; SINGLIX FS1 (trfs1) partition
   821 00006A3F 7549                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   822                              <1> loc_set_valid_hd_fs_partition_params:
   823 00006A41 FE05[610D0100]      <1> 	inc	byte [Last_DOS_DiskNo] ; > 1
   824 00006A47 30C0                <1> 	xor	al, al ; mov al, 0
   825                              <1> 	;mov	[drv], dl
   826 00006A49 29DB                <1> 	sub	ebx, ebx ; 0
   827 00006A4B 8A3D[610D0100]      <1> 	mov	bh, [Last_DOS_DiskNo] 
   828 00006A51 81C300010900        <1> 	add	ebx, Logical_DOSDisks
   829 00006A57 C6430102            <1> 	mov	byte [ebx+LD_DiskType], 2
   830 00006A5B 885302              <1> 	mov	[ebx+LD_PhyDrvNo], dl
   831                              <1> 	;mov	[ebx+LD_FATType], al ; 0
   832                              <1> 	;mov	[ebx+LD_FSType], ah
   833 00006A5E 66894303            <1> 	mov	[ebx+LD_FATType], ax
   834                              <1> 	;mov	eax, [esi+ptStartSector]
   835                              <1> 	;mov	[ebx+LD_StartSector], eax
   836                              <1> loc_hd_fs_logical_drv_init:
   837 00006A62 89DD                <1> 	mov	ebp, ebx ; 10/01/2016
   838                              <1> 	;mov	dl, [ebx+LD_PhyDrvNo]
   839 00006A64 A0[8A5E0100]        <1> 	mov	al, [HD_LBA_yes] ; 10/01/2016
   840 00006A69 884305              <1> 	mov	[ebx+LD_LBAYes], al
   841 00006A6C 89DE                <1> 	mov	esi, ebx
   842 00006A6E BB[965E0100]        <1> 	mov	ebx, DOSBootSectorBuff ; buffer address
   843 00006A73 08C0                <1> 	or	al, al
   844 00006A75 7515                <1> 	jnz	short loc_hd_fs_drv_init_load_bs_lba
   845                              <1> loc_hd_fs_drv_init_load_bs_chs:
   846 00006A77 8A7601              <1> 	mov	dh, [esi+ptBeginHead]
   847 00006A7A 668B4E02            <1> 	mov	cx, [esi+ptBeginSector]
   848 00006A7E 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
   849                              <1> 	;mov	ebx, DOSBootSectorBuff
   850 00006A82 E8A6D7FFFF          <1> 	call	int13h
   851 00006A87 7311                <1> 	jnc	short loc_hd_drv_fs_boot_validation
   852                              <1> loc_validate_hd_fs_partition_err_retn:
   853 00006A89 C3                  <1> 	retn
   854                              <1> loc_validate_hd_fs_partition_stc_retn:
   855 00006A8A F9                  <1> 	stc
   856 00006A8B C3                  <1> 	retn
   857                              <1> loc_hd_fs_drv_init_load_bs_lba:
   858                              <1> 	; DL = Physical drive number
   859                              <1> 	;mov	esi, ebx
   860 00006A8C 8B4E08              <1>    	mov	ecx, [esi+ptStartSector] ; sector number
   861                              <1> 	;mov	ebx, DOSBootSectorBuff ; buffer address
   862                              <1> 	; LBA read/write (with private LBA function) 
   863                              <1> 	;((Retro UNIX 386 v1 - DISK I/O code by Erdogan Tan))
   864                              <1> 	; dl = physical drive number (0,1, 80h, 81h, 82h, 83h)
   865 00006A8F B41B                <1> 	mov	ah, 1Bh ; LBA read
   866 00006A91 B001                <1> 	mov	al, 1 ; sector count
   867 00006A93 E895D7FFFF          <1> 	call	int13h
   868 00006A98 72EF                <1> 	jc	short loc_validate_hd_fs_partition_err_retn
   869                              <1> loc_hd_drv_fs_boot_validation:
   870                              <1> 	;mov	esi, DOSBootSectorBuff
   871 00006A9A 89DE                <1> 	mov	esi, ebx ; Boot sector buffer
   872 00006A9C 6681BEFE01000055AA  <1> 	cmp	word [esi+BS_Validation], 0AA55h
   873 00006AA5 75E3                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   874                              <1>         ;
   875                              <1> 	;Singlix FS Extensions to TR-DOS (7/6/2009) 
   876 00006AA7 66817E034653        <1> 	cmp	word [esi+bs_FS_Identifier], 'FS' ; 03/02/2018
   877 00006AAD 75DB                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   878                              <1>         ;'A1h' check is not necessary
   879                              <1> 	;  if 'FS' check is passed as OK/Yes.
   880 00006AAF 807E09A1            <1> 	cmp	byte [esi+bs_FS_PartitionID], 0A1h
   881 00006AB3 75D5                <1> 	jne	short loc_validate_hd_fs_partition_stc_retn
   882                              <1> 	;
   883 00006AB5 89EF                <1> 	mov	edi, ebp ; 10/01/2016
   884                              <1> 	;
   885 00006AB7 8A462D              <1> 	mov	al, byte [esi+bs_FS_LBA_Ready]
   886 00006ABA 884705              <1> 	mov	[edi+LD_FS_LBAYes], al
   887                              <1> 	;
   888                              <1> 	; 03/01/2010 CHS -> DOS FAT/BPB compatibility fix
   889 00006ABD 8A4608              <1> 	mov	al, [esi+bs_FS_MediaAttrib]
   890 00006AC0 884706              <1> 	mov	byte [edi+LD_FS_MediaAttrib], al
   891                              <1> 	;
   892 00006AC3 8A460A              <1> 	mov	al, [esi+bs_FS_VersionMaj]
   893 00006AC6 884707              <1> 	mov	[edi+LD_FS_VersionMajor], al
   894                              <1> 	;
   895 00006AC9 668B4606            <1> 	mov	ax, [esi+bs_FS_BytesPerSec]
   896 00006ACD 66894711            <1> 	mov	[edi+LD_FS_BytesPerSec], ax
   897 00006AD1 8A462E              <1> 	mov	al, [esi+bs_FS_SecPerTrack]
   898 00006AD4 30E4                <1> 	xor	ah, ah ; 09/12/2017
   899 00006AD6 6689471E            <1> 	mov	[edi+LD_FS_SecPerTrack], ax
   900 00006ADA 8A462F              <1> 	mov	al, [esi+bs_FS_Heads]
   901 00006ADD 66894720            <1> 	mov	[edi+LD_FS_NumHeads], ax
   902                              <1> 	;
   903 00006AE1 8B4628              <1> 	mov	eax, [esi+bs_FS_UnDelDirD]
   904 00006AE4 894722              <1> 	mov	[edi+LD_FS_UnDelDirD], eax
   905 00006AE7 8B5618              <1> 	mov	edx, [esi+bs_FS_MATLocation]
   906 00006AEA 89570C              <1> 	mov	[edi+LD_FS_MATLocation], edx
   907 00006AED 8B461C              <1> 	mov	eax, [esi+bs_FS_RootDirD]
   908 00006AF0 894708              <1> 	mov	[edi+LD_FS_RootDirD], eax
   909 00006AF3 8B460C              <1> 	mov	eax, [esi+bs_FS_BeginSector]
   910 00006AF6 89476C              <1> 	mov	[edi+LD_FS_BeginSector], eax
   911 00006AF9 8B4710              <1> 	mov	eax, [edi+bs_FS_VolumeSize]
   912 00006AFC 894770              <1> 	mov	[edi+LD_FS_VolumeSize], eax
   913                              <1> 	;
   914 00006AFF 89D0                <1> 	mov	eax, edx ; [edi+LD_FS_MATLocation]
   915 00006B01 03476C              <1> 	add	eax, [edi+LD_FS_BeginSector]
   916 00006B04 89FE                <1> 	mov	esi, edi
   917                              <1> mread_hd_fs_MAT_sector:
   918                              <1>        ;mov	ebx, DOSBootSectorBuff
   919 00006B06 B901000000          <1> 	mov	ecx, 1
   920 00006B0B E84C8D0000          <1> 	call	disk_read
   921 00006B10 7248                <1> 	jc	short loc_validate_hd_fs_partition_retn
   922                              <1> 	; EDI will not be changed
   923 00006B12 89DE                <1> 	mov	esi, ebx
   924                              <1> use_hdfs_mat_sector_params:
   925 00006B14 8B460C              <1> 	mov	eax, [esi+FS_MAT_DATLocation]
   926 00006B17 894714              <1> 	mov	[edi+LD_FS_DATLocation], eax
   927 00006B1A 8B4610              <1> 	mov	eax, [esi+FS_MAT_DATScount]
   928 00006B1D 894718              <1> 	mov	[edi+LD_FS_DATSectors], eax
   929 00006B20 8B4614              <1> 	mov	eax, [esi+FS_MAT_FreeSectors]
   930 00006B23 894774              <1>         mov     [edi+LD_FS_FreeSectors], eax
   931 00006B26 8B4618              <1> 	mov	eax, [esi+FS_MAT_FirstFreeSector]
   932 00006B29 894778              <1> 	mov	[edi+LD_FS_FirstFreeSector], eax
   933 00006B2C 8B4708              <1> 	mov	eax, [edi+LD_FS_RootDirD]
   934 00006B2F 03476C              <1> 	add	eax, [edi+LD_FS_BeginSector]
   935 00006B32 89FE                <1> 	mov	esi, edi   
   936                              <1> read_hd_fs_RDT_sector:
   937 00006B34 BB[965E0100]        <1> 	mov	ebx, DOSBootSectorBuff
   938                              <1> 	;mov	ecx, 1
   939 00006B39 B101                <1> 	mov	cl, 1
   940 00006B3B E81C8D0000          <1> 	call	disk_read
   941 00006B40 7218                <1> 	jc	short loc_validate_hd_fs_partition_retn
   942                              <1> 	; EDI will not be changed
   943 00006B42 89DE                <1> 	mov	esi, ebx
   944                              <1> use_hdfs_RDT_sector_params:
   945 00006B44 8B461C              <1> 	mov	eax, [esi+FS_RDT_VolumeSerialNo]
   946 00006B47 894728              <1> 	mov	[edi+LD_FS_VolumeSerial], eax
   947 00006B4A 57                  <1> 	push	edi
   948                              <1> 	;mov	ecx, 16
   949 00006B4B B110                <1> 	mov	cl, 16
   950 00006B4D 83C640              <1> 	add	esi, FS_RDT_VolumeName
   951 00006B50 83C72C              <1> 	add	edi, LD_FS_VolumeName
   952 00006B53 F3A5                <1> 	rep	movsd ; 64 bytes
   953 00006B55 5E                  <1> 	pop	esi
   954                              <1> 		; Volume Name Reset
   955 00006B56 C6467E06            <1>         mov     byte [esi+LD_FS_MediaChanged], 6
   956                              <1> 	;
   957                              <1>         ;mov	cl, [Last_DOS_DiskNo] 
   958                              <1> 	;add	cl, 'A'
   959                              <1> 	;mov	[esi+LD_FS_Name], cl
   960                              <1> 
   961                              <1> loc_validate_hd_fs_partition_retn:
   962 00006B5A C3                  <1> 	retn
   963                              <1> 
   964                              <1> load_masterboot:
   965                              <1> 	; 14/07/2020 (Reset function has been removed)
   966                              <1> 	;
   967                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
   968                              <1> 	; 2005 - 2011
   969                              <1> 	; input -> DL = drive number
   970                              <1> ;	mov	ah, 0Dh ; Alternate disk reset
   971                              <1> ;	call	int13h
   972                              <1> ;	jnc	short pass_reset_error
   973                              <1> ;harddisk_error:
   974                              <1> ;  	retn
   975                              <1> ;pass_reset_error:
   976 00006B5B BB[865B0100]        <1> 	mov	ebx, MasterBootBuff
   977 00006B60 66B80102            <1> 	mov	ax, 0201h
   978 00006B64 66B90100            <1> 	mov	cx, 1
   979 00006B68 30F6                <1> 	xor	dh, dh
   980 00006B6A E8BED6FFFF          <1>  	call	int13h
   981 00006B6F 720C                <1> 	jc	short harddisk_error
   982                              <1> 	;
   983 00006B71 66813D[845D0100]55- <1> 	cmp	word [MBIDCode], 0AA55h
   983 00006B79 AA                  <1>
   984 00006B7A 7401                <1> 	je	short load_masterboot_ok
   985 00006B7C F9                  <1> 	stc
   986                              <1> harddisk_error:
   987                              <1> load_masterboot_ok:
   988 00006B7D C3                  <1> 	retn
   989                              <1> 
   990                              <1> get_free_FAT_sectors:
   991                              <1> 	; 21/12/2017
   992                              <1> 	; 29/02/2016
   993                              <1> 	; 13/02/2016
   994                              <1> 	; 04/02/2016
   995                              <1> 	; 07/01/2016 (TRDOS 386 = TRDOS v2.0)
   996                              <1> 	; 11/07/2010
   997                              <1> 	; 21/06/2009
   998                              <1> 	; INPUT: ESI = Logical DOS Drive Description Table address
   999                              <1> 	; OUTPUT: STC => Error
  1000                              <1>         ;	cf = 0 and EAX = Free FAT sectors
  1001                              <1> 	; Also, related parameters and FAT buffer will be reset and updated
  1002                              <1> 
  1003 00006B7E 31C0                <1> 	xor	eax, eax
  1004                              <1> 	;mov	[esi+LD_FreeSectors], eax ; Reset
  1005                              <1> 	
  1006 00006B80 807E0302            <1>         cmp     byte [esi+LD_FATType], 2
  1007 00006B84 7654                <1> 	jna	short loc_gfc_get_fat_free_clusters
  1008                              <1> 
  1009                              <1> 	; 29/02/2016
  1010 00006B86 48                  <1> 	dec	eax ; 0FFFFFFFFh
  1011 00006B87 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; Free cluster count (reset)
  1012 00006B8A 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; First Free Cluster (reset)
  1013 00006B8D 40                  <1> 	inc	eax ; 0
  1014                              <1> 	;
  1015 00006B8E 668B4636            <1> 	mov	ax, [esi+LD_BPB+BPB_FSInfo]
  1016 00006B92 03466C              <1> 	add	eax, [esi+LD_StartSector]
  1017                              <1> 
  1018 00006B95 BB[965E0100]        <1> 	mov	ebx, DOSBootSectorBuff
  1019 00006B9A B901000000          <1> 	mov	ecx, 1
  1020 00006B9F E8B88C0000          <1>  	call	disk_read
  1021 00006BA4 7301                <1> 	jnc	short loc_gfc_check_fsinfo_signs
  1022                              <1> retn_gfc_get_fsinfo_sec:
  1023 00006BA6 C3                  <1> 	retn
  1024                              <1> 
  1025                              <1> loc_gfc_check_fsinfo_signs:
  1026 00006BA7 BB[965E0100]        <1> 	mov 	ebx, DOSBootSectorBuff ; 13/02/2016
  1027 00006BAC 813B52526141        <1>         cmp     dword [ebx], 41615252h
  1028 00006BB2 7524                <1> 	jne	short retn_gfc_get_fsinfo_stc
  1029                              <1> 	;add	ebx, 484
  1030                              <1> 	;cmp	dword [ebx], 61417272h
  1031 00006BB4 81BBE4010000727241- <1> 	cmp	dword [ebx+484], 61417272h
  1031 00006BBD 61                  <1>
  1032 00006BBE 7518                <1> 	jne	short retn_gfc_get_fsinfo_stc
  1033                              <1> 	;add	ebx, 4
  1034                              <1> 	;mov	eax, [ebx]
  1035 00006BC0 8B83E8010000        <1> 	mov	eax, [ebx+488]
  1036                              <1> 	; 29/02/2016
  1037 00006BC6 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; Free cluster count
  1038 00006BC9 8B93EC010000        <1> 	mov	edx,  [ebx+492] 
  1039 00006BCF 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; First Free Cluster
  1040                              <1> 	; 21/12/2017
  1041 00006BD2 89C3                <1> 	mov	ebx, eax ; (initial value = 0FFFFFFFFh)
  1042 00006BD4 43                  <1> 	inc	ebx ; 0FFFFFFFFh -> 0  
  1043 00006BD5 7513                <1> 	jnz	short short retn_from_get_free_fat32_clusters
  1044 00006BD7 C3                  <1> 	retn
  1045                              <1> 
  1046                              <1> retn_gfc_get_fsinfo_stc:
  1047 00006BD8 F9                  <1> 	stc
  1048 00006BD9 C3                  <1> 	retn
  1049                              <1> 
  1050                              <1> loc_gfc_get_fat_free_clusters:
  1051                              <1> 	;mov	eax, 2
  1052 00006BDA B002                <1> 	mov	al, 2
  1053                              <1> 	;mov	[FAT_CurrentCluster], eax
  1054                              <1> loc_gfc_loop_get_next_cluster:
  1055 00006BDC E8EB4F0000          <1> 	call	get_next_cluster
  1056 00006BE1 730E                <1> 	jnc	short loc_gfc_free_fat_clusters_cont
  1057 00006BE3 21C0                <1> 	and	eax, eax
  1058 00006BE5 7411                <1> 	jz	short loc_gfc_pass_inc_free_cluster_count
  1059                              <1>  
  1060                              <1> retn_from_get_free_fat_clusters:
  1061 00006BE7 8B4674              <1> 	mov	eax, [esi+LD_FreeSectors] ; Free clusters !
  1062                              <1> retn_from_get_free_fat32_clusters:
  1063 00006BEA 0FB65E13            <1>         movzx	ebx, byte [esi+LD_BPB+BPB_SecPerClust]
  1064 00006BEE F7E3                <1>       	mul	ebx
  1065                              <1> 	;mov	[esi+LD_FreeSectors], eax ; Free sectors
  1066                              <1> retn_get_free_sectors_calc:
  1067 00006BF0 C3                  <1> 	retn
  1068                              <1> 
  1069                              <1> loc_gfc_free_fat_clusters_cont:
  1070 00006BF1 09C0                <1> 	or	eax, eax
  1071 00006BF3 7503                <1> 	jnz	short loc_gfc_pass_inc_free_cluster_count
  1072 00006BF5 FF4674              <1> 	inc	dword [esi+LD_FreeSectors] ; Free clusters !
  1073                              <1>    
  1074                              <1> loc_gfc_pass_inc_free_cluster_count:
  1075                              <1> 	;mov	eax, [FAT_CurrentCluster]
  1076 00006BF8 89C8                <1> 	mov	eax, ecx ; [FAT_CurrentCluster]
  1077 00006BFA 3B4678              <1> 	cmp	eax, [esi+LD_Clusters]
  1078 00006BFD 77E8                <1> 	ja	short retn_from_get_free_fat_clusters
  1079 00006BFF 40                  <1> 	inc	eax
  1080                              <1> 	;mov	[FAT_CurrentCluster], eax
  1081 00006C00 EBDA                <1> 	jmp	short loc_gfc_loop_get_next_cluster
  1082                              <1> 
  1083                              <1> floppy_drv_init:
  1084                              <1> 	; 09/12/2017
  1085                              <1> 	; 06/07/2016
  1086                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1087                              <1> 	; 24/07/2011
  1088                              <1> 	; 04/07/2009
  1089                              <1> 	; INPUT ->
  1090                              <1> 	;	DL = Drive number (0,1)
  1091                              <1> 	; OUTPUT ->
  1092                              <1> 	;	BL = drive name
  1093                              <1> 	;	BH = drive number
  1094                              <1> 	;	ESI = Logical DOS drv description table
  1095                              <1> 	;	EAX = Volume serial number
  1096                              <1>  
  1097 00006C02 BE[565D0000]        <1> 	mov	esi, fd0_type ; 10/01/2016
  1098 00006C07 BF00010900          <1> 	mov	edi, Logical_DOSDisks
  1099 00006C0C 08D2                <1> 	or	dl, dl
  1100 00006C0E 7407                <1> 	jz	short loc_drv_init_fd0_fd1
  1101 00006C10 81C700010000        <1> 	add	edi, 100h
  1102 00006C16 46                  <1> 	inc	esi ; fd1_type ; 10/01/2016
  1103                              <1> loc_drv_init_fd0_fd1:
  1104 00006C17 C6477E00            <1> 	mov	byte [edi+LD_MediaChanged], 0
  1105 00006C1B 803E01              <1> 	cmp	byte [esi], 1 ; type (>0 if it is existing) 
  1106                              <1> 		; 4 = 1.44 MB, 80 track, 3 1/2"
  1107 00006C1E 7221                <1> 	jb	short read_fd_boot_sector_retn
  1108 00006C20 885702              <1> 	mov	[edi+LD_PhyDrvNo], dl
  1109                              <1> read_fd_boot_sector:
  1110 00006C23 30F6                <1> 	xor	dh, dh
  1111 00006C25 B904000000          <1> 	mov	ecx, 4 ; Retry Count
  1112                              <1> read_fd_boot_sector_again:
  1113 00006C2A 51                  <1> 	push 	ecx
  1114                              <1> 	;mov	cx, 1
  1115 00006C2B B101                <1> 	mov	cl, 1
  1116 00006C2D 66B80102            <1> 	mov	ax, 0201h ; Read 1 sector
  1117 00006C31 BB[965E0100]        <1> 	mov	ebx, DOSBootSectorBuff
  1118 00006C36 E8F2D5FFFF          <1> 	call	int13h
  1119 00006C3B 59                  <1> 	pop	ecx
  1120 00006C3C 7304                <1> 	jnc	short use_fd_boot_sector_params
  1121 00006C3E E2EA                <1> 	loop	read_fd_boot_sector_again
  1122                              <1> 
  1123                              <1> read_fd_boot_sector_stc_retn:
  1124 00006C40 F9                  <1> 	stc
  1125                              <1> read_fd_boot_sector_retn:
  1126 00006C41 C3                  <1> 	retn
  1127                              <1> 
  1128                              <1> use_fd_boot_sector_params:
  1129                              <1> 	;mov	esi, DOSBootSectorBuff
  1130 00006C42 89DE                <1> 	mov	esi, ebx
  1131 00006C44 6681BEFE01000055AA  <1> 	cmp	word [esi+BS_Validation], 0AA55h
  1132 00006C4D 75F1                <1> 	jne	short read_fd_boot_sector_stc_retn
  1133 00006C4F 66817E035346        <1>         cmp     word [esi+bs_FS_Identifier], 'SF'
  1134 00006C55 0F85A2000000        <1>         jne     use_fd_fatfs_boot_sector_params
  1135                              <1> 	;
  1136 00006C5B 8A462D              <1> 	mov	al, [esi+bs_FS_LBA_Ready]
  1137 00006C5E 884705              <1> 	mov	[edi+LD_FS_LBAYes], al
  1138                              <1> 	;
  1139                              <1> 	; 03/01/2010 CHS -> DOS FAT/BPB compatibility fix
  1140 00006C61 8A4608              <1> 	mov	al, [esi+bs_FS_MediaAttrib]
  1141 00006C64 884706              <1> 	mov	[edi+LD_FS_MediaAttrib], al
  1142                              <1> 	;
  1143 00006C67 8A460A              <1>         mov	al, [esi+bs_FS_VersionMaj]
  1144 00006C6A 884707              <1> 	mov	byte [edi+LD_FS_VersionMajor], al
  1145 00006C6D 668B4606            <1> 	mov	ax, [esi+bs_FS_BytesPerSec]
  1146 00006C71 66894711            <1> 	mov	[edi+LD_FS_BytesPerSec], ax
  1147 00006C75 8A462E              <1> 	mov	al, [esi+bs_FS_SecPerTrack]
  1148 00006C78 28E4                <1> 	sub	ah, ah ; 09/12/2017
  1149 00006C7A 6689471E            <1> 	mov	[edi+LD_FS_SecPerTrack], ax
  1150 00006C7E 8A462F              <1> 	mov	al, [esi+bs_FS_Heads]
  1151 00006C81 66894720            <1> 	mov	[edi+LD_FS_NumHeads], ax
  1152                              <1> 	;
  1153 00006C85 8B4628              <1> 	mov	eax, [esi+bs_FS_UnDelDirD]
  1154 00006C88 894722              <1> 	mov	[edi+LD_FS_UnDelDirD], eax
  1155 00006C8B 8B4618              <1> 	mov	eax, [esi+bs_FS_MATLocation]
  1156 00006C8E 89470C              <1> 	mov	[edi+LD_FS_MATLocation], eax
  1157 00006C91 8B461C              <1> 	mov	eax, [esi+bs_FS_RootDirD]
  1158 00006C94 894708              <1> 	mov	[edi+LD_FS_RootDirD], eax
  1159 00006C97 8B460C              <1> 	mov	eax, [esi+bs_FS_BeginSector]
  1160 00006C9A 89476C              <1> 	mov	[edi+LD_FS_BeginSector], eax
  1161 00006C9D 8B4610              <1> 	mov	eax, [esi+bs_FS_VolumeSize]
  1162 00006CA0 894770              <1> 	mov	[edi+LD_FS_VolumeSize], eax
  1163                              <1> 	;		
  1164 00006CA3 89FE                <1> 	mov	esi, edi
  1165 00006CA5 8B460C              <1>  	mov	eax, [esi+LD_FS_MATLocation]
  1166                              <1> 	;add	eax, [edi+LD_FS_BeginSector]
  1167                              <1> read_fd_MAT_sector_again:
  1168                              <1> 	;mov	ebx, DOSBootSectorBuff
  1169                              <1> 	;mov	ecx, 1
  1170 00006CA8 B101                <1> 	mov	cl, 1
  1171 00006CAA E8B38B0000          <1> 	call	chs_read
  1172 00006CAF 89DE                <1> 	mov	esi, ebx
  1173 00006CB1 7301                <1> 	jnc	short use_fdfs_mat_sector_params
  1174                              <1> 	;jmp	short read_fd_boot_sector_retn
  1175 00006CB3 C3                  <1> 	retn
  1176                              <1> use_fdfs_mat_sector_params:
  1177 00006CB4 8B460C              <1> 	mov	eax, [esi+FS_MAT_DATLocation]
  1178 00006CB7 894714              <1> 	mov	[edi+LD_FS_DATLocation], eax
  1179 00006CBA 8B4610              <1> 	mov	eax, [esi+FS_MAT_DATScount]
  1180 00006CBD 894718              <1> 	mov	[edi+LD_FS_DATSectors], eax
  1181 00006CC0 8B4714              <1> 	mov	eax, [edi+FS_MAT_FreeSectors]
  1182 00006CC3 894774              <1> 	mov	[edi+LD_FS_FreeSectors], eax
  1183 00006CC6 8B4618              <1> 	mov	eax, [esi+FS_MAT_FirstFreeSector]
  1184 00006CC9 894778              <1> 	mov	[edi+LD_FS_FirstFreeSector], eax
  1185                              <1> 	;
  1186 00006CCC 89FE                <1> 	mov	esi, edi
  1187 00006CCE 8B4608              <1>  	mov	eax, [esi+LD_FS_RootDirD]
  1188                              <1> read_fd_RDT_sector_again:
  1189                              <1> 	;mov	ebx, DOSBootSectorBuff
  1190                              <1> 	;mov	cx, 1
  1191 00006CD1 B101                <1> 	mov	cl, 1
  1192 00006CD3 E88A8B0000          <1> 	call	chs_read
  1193 00006CD8 89DE                <1> 	mov	esi, ebx
  1194 00006CDA 7220                <1> 	jc	short read_fd_RDT_sector_retn
  1195                              <1> use_fdfs_RDT_sector_params:
  1196 00006CDC 8B461C              <1> 	mov	eax, [esi+FS_RDT_VolumeSerialNo]
  1197 00006CDF 894728              <1> 	mov	[edi+LD_FS_VolumeSerial], eax
  1198 00006CE2 57                  <1> 	push	edi
  1199                              <1> 	;mov	ecx, 16
  1200 00006CE3 B110                <1> 	mov	cl, 16	
  1201 00006CE5 83C640              <1> 	add	esi, FS_RDT_VolumeName
  1202 00006CE8 83C72C              <1> 	add	edi, LD_FS_VolumeName
  1203 00006CEB F3A5                <1> 	rep	movsd ; 64 bytes
  1204 00006CED 5E                  <1> 	pop	esi
  1205 00006CEE C6460300            <1> 	mov	byte [esi+LD_FATType], 0
  1206 00006CF2 C64604A1            <1> 	mov	byte [esi+LD_FSType], 0A1h  
  1207 00006CF6 E9A5000000          <1>         jmp     loc_cont_use_fd_boot_sector_params
  1208                              <1> 
  1209                              <1> read_fd_RDT_sector_stc_retn:
  1210 00006CFB F9                  <1> 	stc
  1211                              <1> read_fd_RDT_sector_retn:
  1212 00006CFC C3                  <1> 	retn
  1213                              <1> 
  1214                              <1> use_fd_fatfs_boot_sector_params:
  1215 00006CFD 807E2629            <1> 	cmp	byte [esi+BS_BootSig], 29h
  1216 00006D01 75F8                <1> 	jne	short read_fd_RDT_sector_stc_retn
  1217 00006D03 807E15F0            <1> 	cmp	byte [esi+BPB_Media], 0F0h
  1218 00006D07 72F3                <1> 	jb	short read_fd_RDT_sector_retn
  1219 00006D09 57                  <1> 	push	edi
  1220 00006D0A 83C706              <1> 	add	edi, LD_BPB
  1221                              <1> 	;mov	ecx, 16
  1222 00006D0D B110                <1> 	mov	cl, 16
  1223 00006D0F F3A5                <1> 	rep	movsd ; 64 bytes 
  1224 00006D11 5E                  <1> 	pop	esi
  1225 00006D12 31C0                <1> 	xor	eax, eax
  1226 00006D14 89466C              <1> 	mov	[esi+LD_StartSector], eax ; 0
  1227 00006D17 668B461C            <1> 	mov	ax, [esi+LD_BPB+BPB_FATSz16]
  1228 00006D1B 8A4E16              <1> 	mov	cl, [esi+LD_BPB+BPB_NumFATs] 
  1229 00006D1E F7E1                <1>   	mul	ecx
  1230                              <1> 	; edx = 0 !
  1231 00006D20 668B5614            <1> 	mov	dx, [esi+LD_BPB+BPB_RsvdSecCnt]
  1232 00006D24 66895660            <1> 	mov	[esi+LD_FATBegin], dx
  1233                              <1> 	;add	eax, edx
  1234 00006D28 6601D0              <1> 	add	ax, dx
  1235 00006D2B 894664              <1> 	mov	[esi+LD_ROOTBegin], eax
  1236 00006D2E 894668              <1> 	mov	[esi+LD_DATABegin], eax 
  1237 00006D31 668B5617            <1> 	mov	dx, [esi+LD_BPB+BPB_RootEntCnt]
  1238                              <1> 	;;shl	edx, 5 ; * 32 (Size of a directory entry)
  1239                              <1> 	;shl	dx, 5
  1240                              <1> 	;;add	edx, 511
  1241                              <1> 	;add	dx, 511
  1242                              <1> 	;;shr	edx, 9 ; edx = ((edx*32)+511) / 512
  1243                              <1> 	;shr	dx, 9
  1244 00006D35 6683C20F            <1> 	add	dx, 15 ; 06/07/2016 (+(512/32)-1)
  1245 00006D39 66C1EA04            <1> 	shr	dx, 4 ; / 16 (==16 entries per sector)
  1246 00006D3D 015668              <1> 	add 	[esi+LD_DATABegin], edx ; + rd sectors
  1247                              <1> 	;movzx	eax, word [esi+LD_BPB+BPB_TotalSec16]
  1248 00006D40 668B4619            <1> 	mov	ax, [esi+LD_BPB+BPB_TotalSec16]
  1249 00006D44 894670              <1> 	mov	[esi+LD_TotalSectors], eax
  1250 00006D47 2B4668              <1> 	sub	eax, [esi+LD_DATABegin]
  1251                              <1>   	;movzx	ecx, byte [esi+LD_BPB+BPB_SecPerClust]
  1252 00006D4A 8A4E13              <1> 	mov	cl, [esi+LD_BPB+BPB_SecPerClust]  
  1253 00006D4D 80F901              <1> 	cmp	cl, 1
  1254 00006D50 7605                <1> 	jna	short save_fd_fatfs_cluster_count
  1255                              <1> 	;sub	edx, edx
  1256 00006D52 6629D2              <1> 	sub	dx, dx ; 0
  1257                              <1> 	;sub	dl, dl ; 06/07/2016
  1258 00006D55 F7F1                <1> 	div	ecx
  1259                              <1> save_fd_fatfs_cluster_count:
  1260 00006D57 894678              <1> 	mov	[esi+LD_Clusters], eax
  1261                              <1> 
  1262                              <1>       ; Maximum Valid Cluster Number = EAX +1
  1263                              <1>       ; with 2 reserved clusters= EAX +2
  1264                              <1>  
  1265                              <1> reset_FAT_buffer_decriptors:
  1266 00006D5A 29C0                <1> 	sub	eax, eax ; 0  
  1267 00006D5C A2[9A600100]        <1> 	mov	[FAT_BuffValidData], al ; 0
  1268 00006D61 A2[9B600100]        <1> 	mov	[FAT_BuffDrvName], al ; 0
  1269 00006D66 A3[9E600100]        <1> 	mov	[FAT_BuffSector], eax ; 0
  1270                              <1> 
  1271                              <1> read_fd_FAT_sectors:
  1272 00006D6B BB001C0900          <1>   	mov	ebx, FAT_Buffer
  1273 00006D70 668B4614            <1> 	mov	ax, [esi+LD_BPB+BPB_RsvdSecCnt]
  1274                              <1> 	;mov	ecx, 3
  1275 00006D74 B103                <1> 	mov	cl, 3 ; 3 sectors
  1276 00006D76 E8E78A0000          <1> 	call	chs_read
  1277 00006D7B 7240                <1> 	jc	short read_fd_FAT_sectors_retn
  1278                              <1> use_fd_FAT_sectors:
  1279 00006D7D 8A4602              <1> 	mov	al, [esi+LD_PhyDrvNo]
  1280 00006D80 0441                <1> 	add	al, 'A' 
  1281 00006D82 A2[9B600100]        <1> 	mov	[FAT_BuffDrvName], al 
  1282 00006D87 C605[9A600100]01    <1>  	mov	byte [FAT_BuffValidData], 1
  1283 00006D8E E82B000000          <1> 	call	fd_init_calculate_free_clusters
  1284 00006D93 7228                <1> 	jc	short read_fd_FAT_sectors_retn
  1285                              <1>   
  1286                              <1> loc_use_fd_boot_sector_params_FAT:
  1287 00006D95 C6460301            <1> 	mov	byte [esi+LD_FATType], 1 ; FAT 12
  1288 00006D99 C6460401            <1> 	mov	byte [esi+LD_FSType], 1
  1289 00006D9D 8B462D              <1>         mov     eax, [esi+LD_BPB+VolumeID]
  1290                              <1> loc_cont_use_fd_boot_sector_params:
  1291 00006DA0 8A7E02              <1> 	mov	bh, [esi+LD_PhyDrvNo]
  1292 00006DA3 887E7D              <1> 	mov	[esi+LD_DParamEntry], bh
  1293 00006DA6 88FB                <1> 	mov	bl, bh
  1294 00006DA8 80C341              <1> 	add	bl, 'A'
  1295 00006DAB 881E                <1> 	mov	byte [esi+LD_Name], bl
  1296 00006DAD C6460101            <1> 	mov	byte [esi+LD_DiskType], 1
  1297 00006DB1 C6460500            <1> 	mov	byte [esi+LD_LBAYes], 0
  1298 00006DB5 C6467C00            <1> 	mov	byte [esi+LD_PartitionEntry], 0
  1299 00006DB9 C6467E06            <1> 	mov	byte [esi+LD_MediaChanged], 6 ; Volume Name Reset
  1300                              <1> 
  1301                              <1> read_fd_FAT_sectors_retn:
  1302 00006DBD C3                  <1> 	retn   
  1303                              <1> 
  1304                              <1> fd_init_calculate_free_clusters:
  1305                              <1> 	; 09/12/2017
  1306                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1307                              <1> 	; 04/07/2009
  1308                              <1> 	; INPUT ->
  1309                              <1> 	;     ESI = Logical DOS drive description table address
  1310                              <1> 	; OUTPUT ->
  1311                              <1> 	;    [ESI+LD_FreeSectors] will be set
  1312                              <1> 	
  1313 00006DBE 29C0                <1> 	sub	eax, eax
  1314 00006DC0 894674              <1> 	mov	[esi+LD_FreeSectors], eax ; 0
  1315 00006DC3 B002                <1> 	mov	al, 2 ; eax = 2
  1316                              <1> 
  1317                              <1> fd_init_loop_get_next_cluster:
  1318 00006DC5 E830000000          <1> 	call	fd_init_get_next_cluster
  1319 00006DCA 722D                <1> 	jc	short fd_init_calculate_free_clusters_retn
  1320                              <1> 
  1321                              <1> fd_init_free_fat_clusters:
  1322                              <1> 	;cmp 	eax, 0
  1323                              <1> 	;ja	short fd_init_pass_inc_free_cluster_count
  1324                              <1> 	;and	eax, eax
  1325                              <1> 	;jnz	short fd_init_pass_inc_free_cluster_count
  1326 00006DCC 6621C0              <1> 	and	ax, ax
  1327 00006DCF 7504                <1> 	jnz	short fd_init_pass_inc_free_cluster_count
  1328                              <1> 	;inc	dword [esi+LD_FreeSectors]
  1329 00006DD1 66FF4674            <1>         inc	word [esi+LD_FreeSectors]
  1330                              <1>     
  1331                              <1> fd_init_pass_inc_free_cluster_count:
  1332                              <1>   	;mov	eax, [FAT_CurrentCluster]
  1333 00006DD5 66A1[96600100]      <1> 	mov	ax, [FAT_CurrentCluster]
  1334                              <1> 	;cmp	eax, [esi+LD_Clusters]
  1335 00006DDB 663B4678            <1> 	cmp	ax, [esi+LD_Clusters]
  1336 00006DDF 7704                <1> 	ja	short short retn_from_fd_init_calculate_free_clusters
  1337                              <1> 	;inc	eax
  1338 00006DE1 6640                <1> 	inc	ax
  1339 00006DE3 EBE0                <1> 	jmp	short fd_init_loop_get_next_cluster
  1340                              <1> 
  1341                              <1> retn_from_fd_init_calculate_free_clusters:
  1342 00006DE5 8A4613              <1>   	mov	al, [esi+LD_BPB+BPB_SecPerClust]
  1343 00006DE8 3C01                <1>   	cmp	al, 1
  1344 00006DEA 760D                <1> 	jna	short fd_init_calculate_free_clusters_retn
  1345                              <1> 	;movzx	eax, al
  1346 00006DEC 30E4                <1> 	xor	ah, ah ; 09/12/2017
  1347                              <1> 	;mov	ecx, [esi+LD_FreeSectors]
  1348 00006DEE 668B4E74            <1> 	mov	cx, [esi+LD_FreeSectors] ; Count of free clusters
  1349                              <1>   	;mul	ecx
  1350 00006DF2 66F7E1              <1> 	mul	cx
  1351                              <1> 	;mov	[esi+LD_FreeSectors], eax
  1352 00006DF5 66894674            <1> 	mov	[esi+LD_FreeSectors], ax
  1353                              <1> fd_init_calculate_free_clusters_retn:
  1354 00006DF9 C3                  <1> 	retn
  1355                              <1> 
  1356                              <1> fd_init_get_next_cluster:
  1357                              <1> 	; 04/02/2016
  1358                              <1> 	; 02/02/2016
  1359                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1360                              <1> 	; 04/07/2009
  1361                              <1> 	; INPUT ->
  1362                              <1> 	;    EAX = Current cluster
  1363                              <1> 	;    ESI = Logical DOS drive description table address
  1364                              <1> 	;    EDX = 0
  1365                              <1> 	; OUTPUT ->
  1366                              <1> 	;    EAX = Next cluster
  1367                              <1> 
  1368 00006DFA A3[96600100]        <1> 	mov	[FAT_CurrentCluster], eax
  1369                              <1> fd_init_get_next_cluster_readnext:
  1370 00006DFF 29D2                <1> 	sub	edx, edx ; 0
  1371 00006E01 BB00040000          <1>   	mov	ebx, 1024 ; 400h
  1372 00006E06 F7F3                <1>   	div	ebx
  1373                              <1>   	; EAX = Count of 3 FAT sectors
  1374                              <1>   	; EDX = Buffer entry index
  1375 00006E08 89C1                <1> 	mov	ecx, eax
  1376                              <1> 	;mov	eax, 3
  1377 00006E0A B003                <1> 	mov	al, 3
  1378 00006E0C F7E2                <1> 	mul	edx ; Multiply by 3
  1379 00006E0E 66D1E8              <1> 	shr	ax, 1 ; Divide by 2
  1380 00006E11 89C3                <1> 	mov	ebx, eax ; Buffer byte offset
  1381 00006E13 81C3001C0900        <1> 	add	ebx, FAT_Buffer
  1382 00006E19 89C8                <1> 	mov	eax, ecx
  1383                              <1> 	;mov	edx, 3
  1384 00006E1B 66BA0300            <1> 	mov	dx, 3
  1385 00006E1F F7E2                <1> 	mul	edx 
  1386                              <1>   	; EAX = FAT Beginning Sector
  1387                              <1> 	; EDX = 0
  1388 00006E21 8A0E                <1> 	mov	cl, [esi+LD_Name]
  1389                              <1> 	;cmp	byte [FAT_BuffValidData], 0
  1390                              <1> 	;jna	short fd_init_load_FAT_sectors0
  1391 00006E23 3A0D[9B600100]      <1> 	cmp	cl, [FAT_BuffDrvName]
  1392 00006E29 751E                <1> 	jne	short fd_init_load_FAT_sectors0
  1393 00006E2B 3B05[9E600100]      <1> 	cmp	eax, [FAT_BuffSector]
  1394 00006E31 751C                <1> 	jne	short fd_init_load_FAT_sectors1
  1395                              <1> 	;mov	eax, [FAT_CurrentCluster]
  1396 00006E33 A0[96600100]        <1> 	mov	al, [FAT_CurrentCluster]
  1397                              <1> 	;shr	eax, 1
  1398 00006E38 D0E8                <1> 	shr	al, 1
  1399 00006E3A 668B03              <1> 	mov	ax, [ebx]
  1400 00006E3D 7306                <1>   	jnc	short fd_init_gnc_even
  1401 00006E3F 66C1E804            <1> 	shr	ax, 4
  1402                              <1> fd_init_gnc_clc_retn:
  1403 00006E43 F8                  <1> 	clc
  1404 00006E44 C3                  <1> 	retn
  1405                              <1> 
  1406                              <1> fd_init_gnc_even:
  1407 00006E45 80E40F              <1> 	and	ah, 0Fh
  1408 00006E48 C3                  <1> 	retn
  1409                              <1> 
  1410                              <1> fd_init_load_FAT_sectors0:
  1411 00006E49 880D[9B600100]      <1> 	mov 	[FAT_BuffDrvName], cl
  1412                              <1> fd_init_load_FAT_sectors1:
  1413 00006E4F C605[9A600100]00    <1> 	mov	byte [FAT_BuffValidData], 0
  1414 00006E56 A3[9E600100]        <1> 	mov	[FAT_BuffSector], eax
  1415 00006E5B 034660              <1> 	add	eax, [esi+LD_FATBegin]
  1416 00006E5E BB001C0900          <1>  	mov	ebx, FAT_Buffer
  1417                              <1> 	;movzx	ecx, word [esi+LD_BPB+BPB_FATSz16]
  1418 00006E63 668B4E1C            <1> 	mov	cx, [esi+LD_BPB+BPB_FATSz16]
  1419 00006E67 662B0D[9E600100]    <1> 	sub	cx, [FAT_BuffSector]
  1420                              <1>         ;cmp	ecx, 3
  1421 00006E6E 6683F903            <1> 	cmp	cx, 3
  1422 00006E72 7605                <1> 	jna	short fdinit_pass_fix_sector_count_3
  1423                              <1> 	;mov	ecx, 3
  1424 00006E74 B903000000          <1> 	mov	ecx, 3
  1425                              <1> fdinit_pass_fix_sector_count_3:  
  1426 00006E79 E8E4890000          <1> 	call	chs_read
  1427 00006E7E 730D                <1> 	jnc	short fd_init_FAT_sectors_no_load_error
  1428 00006E80 C605[9A600100]00    <1> 	mov	byte [FAT_BuffValidData], 0
  1429                              <1> 		; Drv not ready or read Error !
  1430 00006E87 B80F000000          <1> 	mov	eax, ERR_DRV_NOT_RDY ; 15
  1431                              <1> 	;xor	edx, edx
  1432 00006E8C C3                  <1> 	retn
  1433                              <1> 
  1434                              <1> fd_init_FAT_sectors_no_load_error:
  1435 00006E8D C605[9A600100]01    <1> 	mov	byte [FAT_BuffValidData], 1
  1436 00006E94 A1[96600100]        <1> 	mov	eax, [FAT_CurrentCluster]
  1437 00006E99 E961FFFFFF          <1>         jmp     fd_init_get_next_cluster_readnext
  1438                              <1> 
  1439                              <1> get_FAT_volume_name:
  1440                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1441                              <1> 	; 12/09/2009
  1442                              <1> 	; INPUT ->
  1443                              <1> 	;	BH = Logical DOS drive number (0,1,2,3,4 ...)
  1444                              <1> 	;       BL = 0
  1445                              <1> 	; OUTPUT ->
  1446                              <1> 	;	CF = 0 -> ESI = Volume name address
  1447                              <1> 	; 	CF = 1 -> Root volume name not found
  1448                              <1> 
  1449                              <1> 	;mov 	ah, 0FFh
  1450                              <1> 	;mov 	al, [Last_Dos_DiskNo]
  1451                              <1> 	;cmp 	al, bh
  1452                              <1> 	;jb     short loc_gfvn_dir_load_err
  1453                              <1> 
  1454 00006E9E 89DE                <1> 	mov	esi, ebx
  1455 00006EA0 81E600FF0000        <1> 	and	esi, 0FF00h ; esi = bh
  1456 00006EA6 81C600010900        <1> 	add	esi, Logical_DOSDisks
  1457 00006EAC 8A06                <1> 	mov     al, [esi+LD_Name]
  1458 00006EAE 8A6603              <1> 	mov     ah, [esi+LD_FATType]
  1459 00006EB1 80FC01              <1> 	cmp     ah, 1
  1460 00006EB4 7210                <1> 	jb    	short loc_gfvn_dir_load_err
  1461 00006EB6 3C41                <1> 	cmp 	al, 'A'
  1462 00006EB8 720C                <1> 	jb      short loc_gfvn_dir_load_err
  1463 00006EBA 80FC02              <1> 	cmp 	ah, 2 
  1464 00006EBD 7708                <1> 	ja      short get_FAT32_root_cluster
  1465                              <1> 	
  1466 00006EBF E8634E0000          <1> 	call    load_FAT_root_directory
  1467 00006EC4 730B                <1> 	jnc     short loc_get_volume_name
  1468                              <1> 
  1469                              <1> loc_gfvn_dir_load_err:
  1470 00006EC6 C3                  <1> 	retn
  1471                              <1> 
  1472                              <1> get_FAT32_root_cluster:
  1473 00006EC7 8B4632              <1> 	mov	eax, [esi+LD_BPB+BPB_RootClus]
  1474 00006ECA E8E34E0000          <1> 	call    load_FAT_sub_directory
  1475 00006ECF 7224                <1> 	jc	short loc_get_volume_name_retn
  1476                              <1> 
  1477                              <1> loc_get_volume_name:
  1478 00006ED1 BE00000800          <1>         mov     esi, Directory_Buffer
  1479 00006ED6 6631C9              <1> 	xor	cx, cx ; 0
  1480                              <1> check_root_volume_name:
  1481 00006ED9 8A06                <1> 	mov	al, [esi]
  1482 00006EDB 08C0                <1> 	or      al, al
  1483 00006EDD 7416                <1> 	jz      short loc_get_volume_name_retn
  1484 00006EDF 807E0B08            <1> 	cmp     byte [esi+0Bh], 08h
  1485 00006EE3 7410                <1> 	je      short loc_get_volume_name_retn
  1486 00006EE5 663B0D[AF600100]    <1> 	cmp     cx, [DirBuff_LastEntry]
  1487 00006EEC 7308                <1> 	jnb     short pass_check_root_volume_name
  1488 00006EEE 6641                <1> 	inc     cx
  1489 00006EF0 83C620              <1> 	add     esi, 32
  1490 00006EF3 EBE4                <1> 	jmp     short check_root_volume_name
  1491                              <1> 
  1492                              <1> loc_get_volume_name_retn:
  1493 00006EF5 C3                  <1> 	retn
  1494                              <1>     
  1495                              <1> pass_check_root_volume_name:
  1496 00006EF6 803D[AB600100]03    <1> 	cmp	byte [DirBuff_FATType], 3
  1497 00006EFD 7230                <1> 	jb	short loc_get_volume_name_retn_xor
  1498                              <1> 
  1499 00006EFF BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1500 00006F04 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1501 00006F09 31C0                <1> 	xor	eax, eax
  1502 00006F0B 8A25[AA600100]      <1> 	mov	ah, [DirBuff_DRV]
  1503 00006F11 80EC41              <1> 	sub	ah, 'A' 
  1504 00006F14 01C6                <1> 	add	esi, eax
  1505 00006F16 A1[B1600100]        <1> 	mov	eax, [DirBuff_Cluster]
  1506 00006F1B E8AC4C0000          <1> 	call	get_next_cluster
  1507 00006F20 7305                <1> 	jnc 	short loc_gfvn_load_FAT32_dir_cluster
  1508                              <1>   	
  1509 00006F22 83F801              <1> 	cmp     eax, 1
  1510 00006F25 F5                  <1> 	cmc
  1511 00006F26 C3                  <1> 	retn
  1512                              <1>   
  1513                              <1> loc_gfvn_load_FAT32_dir_cluster:
  1514 00006F27 E8864E0000          <1> 	call	load_FAT_sub_directory
  1515 00006F2C 73A3                <1> 	jnc	short loc_get_volume_name
  1516 00006F2E C3                  <1> 	retn
  1517                              <1> 
  1518                              <1> loc_get_volume_name_retn_xor:
  1519 00006F2F 31C0                <1> 	xor 	eax, eax
  1520 00006F31 C3                  <1> 	retn
  1521                              <1> 
  1522                              <1> get_media_change_status:
  1523                              <1> 	; 10/01/2016 (TRDOS 386 = TRDOS v2.0)
  1524                              <1> 	; 09/09/2009
  1525                              <1> 	; INPUT:
  1526                              <1> 	;     DL = Drive number (physical)
  1527                              <1> 	; OUTPUT: clc & AH = 6 media changed
  1528                              <1> 	;     clc & AH = 0 media not changed         
  1529                              <1> 	;     stc -> Drive not ready or an error 
  1530                              <1>   
  1531 00006F32 B416                <1> 	mov	ah, 16h
  1532 00006F34 E8F4D2FFFF          <1>   	call	int13h
  1533 00006F39 80FC06              <1> 	cmp	ah, 06h
  1534 00006F3C 7405                <1> 	je	short loc_gmc_status_retn
  1535 00006F3E 08E4                <1> 	or	ah, ah
  1536 00006F40 7401                <1> 	jz	short loc_gmc_status_retn
  1537                              <1> loc_gmc_status_stc_retn:    
  1538 00006F42 F9                  <1> 	stc
  1539                              <1> loc_gmc_status_retn:
  1540 00006F43 C3                  <1> 	retn
  2307                                  %include 'trdosk3.s' ; 06/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - MAIN PROGRAM : trdosk3.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 31/12/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 06/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; MAINPROG.ASM (09/11/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; MAINPROG.ASM [ TRDOS KERNEL - COMMAND EXECUTER SECTION - MAIN PROGRAM ]
    14                              <1> ; (c) 2004-2011  Erdogan TAN  [ 17/01/2004 ]  Last Update: 09/11/2011
    15                              <1> ; CMD_INTR.ASM [ TRDOS Command Interpreter Procedure ] Last Update: 09/11/2011
    16                              <1> ; DIR.ASM [ DIRECTORY FUNCTIONS ] Last Update: 09/10/2011
    17                              <1> ; FILE.ASM [ FILE FUNCTIONS ] Last Update: 09/10/2011
    18                              <1> 
    19                              <1> change_current_drive:
    20                              <1> 	; 16/10/2016
    21                              <1> 	; 02/02/2016
    22                              <1> 	; 15/01/2016 (TRDOS 386 = TRDOS v2.0)
    23                              <1> 	; 18/08/2011
    24                              <1> 	; 09/09/2009
    25                              <1> 	; INPUT:
    26                              <1> 	;   DL = Logical DOS Drive Number
    27                              <1> 	; OUTPUT:
    28                              <1> 	;  cf=1 -> Not successful
    29                              <1> 	;   EAX = Error code
    30                              <1> 	;  cf=0 ->
    31                              <1> 	;   EAX = 0 (successful)
    32                              <1> 
    33 00006F44 31DB                <1> 	xor	ebx, ebx
    34 00006F46 88D7                <1> 	mov	bh, dl
    35                              <1> 
    36                              <1> 	;cmp	dl, 1
    37                              <1> 	;jna	short loc_ccdrv_initial_media_change_check
    38                              <1> 	;cmp	bh, [Last_Dos_DiskNo]
    39                              <1> 	;ja	short loc_ccdrv_drive_not_ready_err
    40                              <1> 
    41                              <1> loc_ccdrv_initial_media_change_check:
    42 00006F48 BE00010900          <1> 	mov	esi, Logical_DOSDisks
    43 00006F4D 01DE                <1> 	add	esi, ebx
    44                              <1> loc_ccdrv_dos_drive_name_check:
    45 00006F4F 80FA02              <1> 	cmp	dl, 2
    46 00006F52 720F                <1> 	jb	short loc_ccdrv_dos_drive_name_check_ok
    47                              <1> 
    48 00006F54 8A06                <1> 	mov	al, [esi+LD_Name]
    49 00006F56 2C41                <1> 	sub	al, 'A'
    50 00006F58 38D0                <1> 	cmp	al, dl
    51 00006F5A 7407                <1> 	je	short loc_ccdrv_dos_drive_name_check_ok
    52                              <1> 
    53                              <1> loc_ccdrv_drive_not_ready_err:
    54                              <1> 	; 16/10/2016 (15h -> 15)
    55 00006F5C B80F000000          <1> 	mov	eax, 15 ; Drive not ready
    56                              <1> loc_change_current_drive_stc_retn:
    57 00006F61 F9                  <1> 	stc
    58 00006F62 C3                  <1> 	retn  
    59                              <1> 
    60                              <1> loc_ccdrv_dos_drive_name_check_ok:
    61 00006F63 8A667E              <1> 	mov	ah, [esi+LD_MediaChanged]
    62 00006F66 80FC06              <1> 	cmp	ah, 6  ; VOLUME NAME CHECK/MOVE SIGN
    63 00006F69 7455                <1> 	je	short loc_ccdrv_get_FAT_volume_name_0
    64                              <1> 
    65 00006F6B 80FA01              <1> 	cmp	dl, 1
    66 00006F6E 777D                <1> 	ja	short loc_gmcs_init_drv_hd
    67                              <1> 
    68                              <1> loc_gmcs_init_drv_fd:
    69 00006F70 08E4                <1> 	or	ah, ah 
    70                              <1> 	; AH = 1 is initialization sign (invalid_fd_parameter)
    71 00006F72 7517                <1> 	jnz	short loc_ccdrv_call_fd_init
    72                              <1> 
    73 00006F74 E8B9FFFFFF          <1> 	call	get_media_change_status
    74 00006F79 72E1                <1> 	jc	short loc_ccdrv_drive_not_ready_err
    75                              <1> 
    76 00006F7B 20E4                <1> 	and	ah, ah
    77 00006F7D 7476                <1> 	jz	short loc_change_current_drv3
    78                              <1> 
    79 00006F7F 80F406              <1> 	xor	ah, 6
    80 00006F82 75D8                <1> 	jnz	short loc_ccdrv_drive_not_ready_err
    81                              <1> 
    82                              <1> loc_ccdrv_call_fd_init_check_vol_id:
    83 00006F84 E8440A0000          <1> 	call	get_volume_serial_number
    84 00006F89 730D                <1> 	jnc	short loc_ccdrv_check_vol_serial
    85                              <1> 
    86                              <1> loc_ccdrv_call_fd_init:
    87 00006F8B E872FCFFFF          <1> 	call	floppy_drv_init
    88 00006F90 731A                <1> 	jnc	short loc_reset_drv_fd_current_dir
    89                              <1> 
    90                              <1> loc_ccdrv_fdinit_fail_retn:
    91                              <1> 	; 16/10/2016
    92 00006F92 B80F000000          <1> 	mov	eax, 15 ; Drive not ready
    93 00006F97 C3                  <1> 	retn
    94                              <1> 
    95                              <1> loc_ccdrv_check_vol_serial:
    96 00006F98 A3[7C590100]        <1> 	mov	[Current_VolSerial], eax
    97                              <1> 	;mov	dl, bh
    98 00006F9D E860FCFFFF          <1> 	call	floppy_drv_init
    99 00006FA2 72EE                <1> 	jc	short loc_ccdrv_fdinit_fail_retn
   100                              <1> 
   101 00006FA4 3B05[7C590100]      <1> 	cmp	eax, [Current_VolSerial]
   102 00006FAA 7445                <1> 	je	short loc_change_current_drv2
   103                              <1> 
   104                              <1> loc_reset_drv_fd_current_dir:
   105 00006FAC 31C0                <1> 	xor	eax, eax              
   106 00006FAE 88467F              <1>         mov	[esi+LD_CDirLevel], al
   107 00006FB1 89F7                <1> 	mov	edi, esi
   108 00006FB3 81C780000000        <1> 	add	edi, LD_CurrentDirectory
   109 00006FB9 B920000000          <1> 	mov	ecx, 32
   110 00006FBE F3AB                <1> 	rep	stosd   
   111                              <1>  
   112                              <1> loc_ccdrv_get_FAT_volume_name_0:
   113 00006FC0 8A4603              <1> 	mov	al, [esi+LD_FATType]
   114 00006FC3 08C0                <1> 	or	al, al
   115 00006FC5 742A                <1> 	jz	short loc_change_current_drv2
   116                              <1> 
   117 00006FC7 56                  <1> 	push	esi 
   118 00006FC8 3C02                <1> 	cmp	al, 2
   119 00006FCA 7705                <1> 	ja	short loc_ccdrv_get_FAT32_vol_name
   120                              <1>              
   121                              <1> loc_ccdrv_get_FAT2_16_vol_name:
   122 00006FCC 83C631              <1> 	add	esi, LD_BPB + VolumeLabel
   123 00006FCF EB03                <1> 	jmp	short loc_ccdrv_get_FAT_volume_name_1
   124                              <1> 
   125                              <1> loc_ccdrv_get_FAT32_vol_name:
   126 00006FD1 83C64D              <1> 	add	esi, LD_BPB + FAT32_VolLab
   127                              <1> loc_ccdrv_get_FAT_volume_name_1:
   128 00006FD4 53                  <1> 	push	ebx
   129 00006FD5 56                  <1> 	push	esi
   130 00006FD6 E8C3FEFFFF          <1> 	call	get_FAT_volume_name
   131 00006FDB 5F                  <1> 	pop	edi
   132 00006FDC 5B                  <1> 	pop	ebx
   133                              <1> 	; BL = 0
   134 00006FDD 720B                <1> 	jc	short loc_change_current_drv1
   135 00006FDF 20C0                <1> 	and	al, al
   136 00006FE1 7407                <1> 	jz	short loc_change_current_drv1
   137                              <1> 
   138                              <1> loc_ccdrv_move_FAT_volume_name:
   139 00006FE3 B90B000000          <1> 	mov	ecx, 11
   140 00006FE8 F3A4                <1> 	rep	movsb
   141                              <1> 
   142                              <1> loc_change_current_drv1:
   143 00006FEA 5E                  <1> 	pop	esi
   144 00006FEB EB04                <1> 	jmp	short loc_change_current_drv2
   145                              <1> 
   146                              <1> loc_gmcs_init_drv_hd:
   147 00006FED 08E4                <1> 	or	ah, ah
   148 00006FEF 7404                <1> 	jz	short loc_change_current_drv3
   149                              <1> 	; BL = 0, BH = Logical DOS drive number
   150                              <1> loc_change_current_drv2:
   151 00006FF1 C6467E00            <1> 	mov	byte [esi+LD_MediaChanged], 0
   152                              <1> loc_change_current_drv3:
   153 00006FF5 883D[86590100]      <1> 	mov	[Current_Drv], bh
   154                              <1> 
   155                              <1> 	;call	restore_current_directory
   156                              <1> 	;retn
   157                              <1> 
   158                              <1> restore_current_directory:
   159                              <1> 	; 11/02/2016
   160                              <1> 	; 15/01/2016 (TRDOS 386 = TRDOS v2.0)
   161                              <1> 	; 25/01/2010
   162                              <1> 	; 12/10/2009
   163                              <1> 	;
   164                              <1> 	; INPUT:
   165                              <1> 	;   ESI = Logical DOS Drive Description Table
   166                              <1> 	;
   167                              <1> 	; OUTPUT:
   168                              <1> 	;   ESI = Logical DOS Drive Description Table
   169                              <1> 	;   EDI = offset Current_Dir_Drv 
   170                              <1> 
   171 00006FFB 8A4603              <1> 	mov	al, [esi+LD_FATType]
   172 00006FFE A2[85590100]        <1> 	mov	[Current_FATType], al
   173                              <1> 
   174 00007003 8A26                <1> 	mov	ah, [esi+LD_Name] 
   175 00007005 8825[87590100]      <1> 	mov	[Current_Dir_Drv], ah
   176                              <1> 
   177 0000700B 20C0                <1> 	and	al, al
   178 0000700D 741D                <1> 	jz	short loc_restore_FS_current_directory
   179                              <1> 
   180                              <1> loc_restore_FAT_current_directory:
   181 0000700F 8A667F              <1> 	mov	ah, [esi+LD_CDirLevel]
   182 00007012 8825[84590100]      <1> 	mov	[Current_Dir_Level], ah
   183 00007018 08E4                <1> 	or	ah, ah
   184 0000701A 7416                <1>         jz	short loc_ccdrv_reset_cdir_FAT_12_16_32_fcluster
   185                              <1> 
   186 0000701C 0FB6D4              <1> 	movzx	edx, ah
   187 0000701F C0E204              <1> 	shl	dl, 4 ; * 16
   188 00007022 01F2                <1>         add	edx, esi
   189 00007024 8B828C000000        <1> 	mov	eax, [edx+LD_CurrentDirectory+12]
   190 0000702A EB2C                <1> 	jmp	short loc_ccdrv_reset_cdir_FAT_fcluster
   191                              <1> 
   192                              <1> loc_restore_FS_current_directory:
   193 0000702C E8BC4D0000          <1> 	call	load_current_FS_directory 
   194 00007031 C3                  <1> 	retn 
   195                              <1> 
   196                              <1> loc_ccdrv_reset_cdir_FAT_12_16_32_fcluster:
   197 00007032 3C03                <1> 	cmp	al, 3
   198 00007034 7205                <1> 	jb	short loc_ccdrv_reset_cdir_FAT_12_16_fcluster
   199                              <1> loc_ccdrv_reset_cdir_FAT32_fcluster:
   200 00007036 8B4632              <1> 	mov	eax, [esi+LD_BPB+FAT32_RootFClust]
   201 00007039 EB04                <1> 	jmp	short loc_ccdrv_check_rootdir_sign
   202                              <1> loc_ccdrv_reset_cdir_FAT_12_16_fcluster:   
   203 0000703B 30C0                <1> 	xor	al, al  ; xor eax, eax
   204 0000703D 31D2                <1> 	xor	edx, edx
   205                              <1> loc_ccdrv_check_rootdir_sign:
   206 0000703F 80BE8000000000      <1> 	cmp	byte [esi+LD_CurrentDirectory], 0
   207 00007046 7510                <1> 	jne	short loc_ccdrv_reset_cdir_FAT_fcluster
   208                              <1> loc_ccdrv_set_rootdir_FAT_fcluster:
   209 00007048 89868C000000        <1>         mov     [esi+LD_CurrentDirectory+12], eax
   210 0000704E C78680000000524F4F- <1> 	mov	dword [esi+LD_CurrentDirectory], 'ROOT'
   210 00007057 54                  <1>
   211                              <1> 
   212                              <1> loc_ccdrv_reset_cdir_FAT_fcluster:
   213 00007058 A3[80590100]        <1> 	mov	[Current_Dir_FCluster], eax
   214                              <1> 
   215 0000705D BF[E3600100]        <1> 	mov	edi, PATH_Array
   216 00007062 89F2                <1> 	mov	edx, esi
   217 00007064 81C680000000        <1> 	add	esi, LD_CurrentDirectory
   218 0000706A B920000000          <1> 	mov	ecx, 32
   219 0000706F F3A5                <1> 	rep	movsd
   220                              <1> 
   221 00007071 E84C2D0000          <1> 	call	change_prompt_dir_string
   222                              <1> 	
   223 00007076 89D6                <1> 	mov	esi, edx
   224                              <1> 	
   225 00007078 29C0                <1>         sub	eax, eax
   226                              <1>        ;sub	edx, edx
   227 0000707A BF[87590100]        <1> 	mov	edi, Current_Dir_Drv
   228                              <1> 
   229 0000707F A2[620D0100]        <1> 	mov	[Restore_CDIR], al ; 0
   230 00007084 C3                  <1> 	retn
   231                              <1> 
   232                              <1> dos_prompt:
   233                              <1> 	; 06/05/2016
   234                              <1> 	; 30/01/2016
   235                              <1> 	; 29/01/2016
   236                              <1> 	; 16/01/2016 (TRDOS 386 = TRDOS v2.0)
   237                              <1> 	; 15/09/2011
   238                              <1> 	; 13/09/2009
   239                              <1> 	; 2004-2005
   240                              <1> 
   241                              <1> 	; 06/05/2016
   242 00007085 C705[40650100]-     <1> 	mov	dword [mainprog_return_addr], return_from_cmd_interpreter
   242 0000708B [39710000]          <1>
   243                              <1> 
   244                              <1> loc_TRDOS_prompt:
   245 0000708F BF[865A0100]        <1> 	mov	edi, TextBuffer
   246 00007094 C6075B              <1> 	mov	byte [edi], "["
   247 00007097 47                  <1> 	inc	edi
   248 00007098 BE[B50D0100]        <1> 	mov	esi, TRDOSPromptLabel
   249                              <1> get_next_prompt_label_char:
   250 0000709D 803E20              <1> 	cmp	byte [esi], 20h
   251 000070A0 7203                <1> 	jb	short pass_prompt_label
   252 000070A2 A4                  <1> 	movsb
   253 000070A3 EBF8                <1> 	jmp	short get_next_prompt_label_char
   254                              <1> pass_prompt_label:
   255 000070A5 C6075D              <1> 	mov	byte [edi], "]"
   256 000070A8 47                  <1> 	inc	edi
   257 000070A9 C60720              <1> 	mov	byte [edi], 20h
   258 000070AC 47                  <1> 	inc	edi
   259 000070AD BE[87590100]        <1> 	mov	esi, Current_Dir_Drv
   260 000070B2 66A5                <1> 	movsw
   261 000070B4 A4                  <1> 	movsb 
   262                              <1> loc_prompt_current_directory:
   263 000070B5 803E20              <1> 	cmp	byte [esi], 20h
   264 000070B8 7203                <1> 	jb	short pass_prompt_current_directory
   265 000070BA A4                  <1> 	movsb
   266 000070BB EBF8                <1> 	jmp	short loc_prompt_current_directory  
   267                              <1> pass_prompt_current_directory:
   268 000070BD C6073E              <1> 	mov	byte [edi], '>'
   269 000070C0 47                  <1> 	inc	edi
   270 000070C1 C60700              <1> 	mov	byte [edi], 0  
   271 000070C4 BE[865A0100]        <1> 	mov	esi, TextBuffer
   272 000070C9 E8FFF2FFFF          <1> 	call	print_msg
   273                              <1>         
   274                              <1> 	;sub	bh, bh ; video page = 0
   275                              <1> 	;call	get_cpos ; get cursor position
   276 000070CE 668B15[DE580100]    <1> 	mov	dx, [CURSOR_POSN] ; video page 0
   277 000070D5 8815[E6590100]      <1> 	mov	[CursorColumn], dl
   278                              <1> 
   279                              <1> 	; 30/01/2016 (to show cursor on the row, again)
   280                              <1> 	; (Initial color attributes of video page 0 is 0)
   281                              <1> 	; (see: 'StartPMP' in trdos386.s)
   282                              <1> 	; 
   283                              <1> 	;mov	edi, 0B8000h ; start of video page 0
   284                              <1> 	;movzx	ecx, dl ; column	 
   285                              <1> 	;mov	al, 80
   286                              <1> 	;mul	dh
   287                              <1> 	;add	ax, cx
   288                              <1> 	;shl	ax, 1 ; character + attribute
   289                              <1> 	;add	di, ax ; (2*80*row) + (2*column)
   290                              <1> 	;neg	cl
   291                              <1> 	;add	cl, 80
   292                              <1> 	;mov	ax, 700h ;  ah = 7 (color attribute)
   293                              <1> 	;rep	stosw	
   294                              <1> 
   295                              <1> loc_rw_char:
   296 000070DB E899000000          <1> 	call	rw_char
   297                              <1> loc_move_command:
   298 000070E0 BE[365A0100]        <1> 	mov	esi, CommandBuffer
   299 000070E5 89F7                <1> 	mov	edi, esi
   300 000070E7 31C9                <1> 	xor	ecx, ecx
   301                              <1> first_command_char:
   302 000070E9 AC                  <1> 	lodsb
   303 000070EA 3C20                <1> 	cmp	al, 20h
   304 000070EC 772E                <1> 	ja	short pass_space_control
   305 000070EE 7241                <1> 	jb	short loc_move_cmd_arguments_ok
   306 000070F0 81FE[855A0100]      <1> 	cmp	esi, CommandBuffer + 79
   307 000070F6 72F1                <1> 	jb	short first_command_char
   308 000070F8 EB37                <1> 	jmp	short loc_move_cmd_arguments_ok
   309                              <1> 
   310                              <1> next_command_char:
   311 000070FA AC                  <1> 	lodsb
   312 000070FB 3C20                <1> 	cmp	al, 20h
   313 000070FD 771D                <1> 	ja	short pass_space_control
   314 000070FF 7230                <1> 	jb	short loc_move_cmd_arguments_ok
   315                              <1> 
   316                              <1> loc_1st_cmd_arg: ; 30/01/2016
   317 00007101 AC                  <1> 	lodsb
   318 00007102 3C20                <1> 	cmp	al, 20h
   319 00007104 74FB                <1> 	je	short loc_1st_cmd_arg
   320 00007106 7229                <1> 	jb	short loc_move_cmd_arguments_ok
   321                              <1> 	
   322 00007108 C60700              <1>         mov     byte [edi], 0
   323 0000710B 47                  <1> 	inc	edi
   324                              <1> 
   325                              <1> loc_move_cmd_arguments:
   326 0000710C AA                  <1> 	stosb
   327 0000710D 81FE[855A0100]      <1> 	cmp	esi, CommandBuffer + 79
   328 00007113 731C                <1> 	jnb	short loc_move_cmd_arguments_ok
   329 00007115 AC                  <1>         lodsb
   330 00007116 3C20                <1> 	cmp	al, 20h
   331 00007118 73F2                <1> 	jnb	short loc_move_cmd_arguments
   332 0000711A EB15                <1> 	jmp	short loc_move_cmd_arguments_ok
   333                              <1> 
   334                              <1> pass_space_control:
   335 0000711C 3C61                <1> 	cmp	al, 61h
   336 0000711E 7206                <1> 	jb	short pass_capitalize
   337 00007120 3C7A                <1> 	cmp	al, 7Ah
   338 00007122 7702                <1> 	ja	short pass_capitalize
   339 00007124 24DF                <1> 	and	al, 0DFh
   340                              <1> pass_capitalize:
   341 00007126 AA                  <1> 	stosb   
   342 00007127 FEC1                <1> 	inc     cl
   343 00007129 81FE[855A0100]      <1>         cmp     esi, CommandBuffer + 79
   344 0000712F 72C9                <1> 	jb      short next_command_char 
   345                              <1> 
   346                              <1> loc_move_cmd_arguments_ok:
   347 00007131 C60700              <1>         mov     byte [edi], 0
   348                              <1> 
   349                              <1> call_command_interpreter:
   350 00007134 E8CF080000          <1> 	call    command_interpreter
   351                              <1> 
   352                              <1> return_from_cmd_interpreter:
   353 00007139 B950000000          <1>         mov	ecx, 80
   354                              <1> 	;mov	cx, 80
   355 0000713E BF[365A0100]        <1> 	mov	edi, CommandBuffer
   356 00007143 30C0                <1> 	xor	al, al
   357 00007145 F3AA                <1> 	rep	stosb
   358                              <1> 	;cmp	byte [Program_Exit], 0
   359                              <1> 	;ja	short loc_terminate_trdos
   360                              <1>         
   361                              <1> 	; 16/01/2016
   362 00007147 803D[225F0000]03    <1> 	cmp	byte [CRT_MODE], 3 ; 80*25 color
   363 0000714E 741D                <1> 	je	short pass_set_txt_mode
   364                              <1> 
   365 00007150 E817A4FFFF          <1> 	call	set_txt_mode ; set vide mode to 03h
   366                              <1> 	; 07/01/2017
   367 00007155 30C0                <1> 	xor	al, al
   368                              <1> 
   369                              <1> loc_check_active_page:
   370                              <1> 	;xor	al, al
   371 00007157 3805[EE580100]      <1> 	cmp	[ACTIVE_PAGE], al ; 0
   372 0000715D 0F842CFFFFFF        <1>         je      loc_TRDOS_prompt 
   373                              <1> 	; AL = 0 = video page 0
   374 00007163 E81DA8FFFF          <1> 	call	set_active_page
   375 00007168 E922FFFFFF          <1>         jmp     loc_TRDOS_prompt ; infinitive loop
   376                              <1> 
   377                              <1> pass_set_txt_mode: 
   378 0000716D BE[FF190100]        <1> 	mov	esi, nextline
   379 00007172 E856F2FFFF          <1> 	call	print_msg
   380 00007177 EBDE                <1> 	jmp     short loc_check_active_page
   381                              <1> 
   382                              <1> rw_char:
   383                              <1> 	; 13/05/2016
   384                              <1> 	; 30/01/2016
   385                              <1> 	; 29/01/2016
   386                              <1> 	; 17/01/2016 (TRDOS 386 = TRDOS v2.0)
   387                              <1> 	; 2004-2005
   388                              <1> 	
   389                              <1> 	; DH = cursor row, DL = cursor column
   390                              <1> 	; BH = 0 = video page number (active page)
   391                              <1> 
   392                              <1> 	;xor	bh, bh ; 0 = video page 0
   393                              <1> 
   394                              <1> readnextchar:
   395 00007179 30E4                <1> 	xor     ah, ah
   396 0000717B E89F9AFFFF          <1> 	call	int16h
   397 00007180 20C0                <1> 	and	al, al
   398 00007182 7432                <1> 	jz	short loc_arrow    
   399 00007184 3CE0                <1> 	cmp	al, 0E0h          
   400 00007186 742E                <1> 	je	short loc_arrow
   401 00007188 3C08                <1> 	cmp	al, 08h             
   402 0000718A 7542                <1> 	jne	short char_return
   403                              <1> loc_back:
   404 0000718C 3A15[E6590100]      <1> 	cmp	dl, [CursorColumn]
   405 00007192 76E5                <1> 	jna     short readnextchar
   406                              <1> prev_column:
   407 00007194 FECA                <1> 	dec	dl
   408                              <1> set_cursor_pos:
   409                              <1> 	;push	dx
   410 00007196 52                  <1> 	push	edx ; 29/12/2017
   411                              <1> 	;xor	bh, bh ; 0 = video page 0
   412                              <1> 	; DH = Row, DL = Column
   413 00007197 E8B5ABFFFF          <1> 	call	_set_cpos ; 17/01/2016
   414 0000719C 5A                  <1>         pop	edx ; 29/12/2017
   415                              <1> 	;pop	dx
   416                              <1> 	;movzx	ebx, dl
   417 0000719D 88D3                <1> 	mov	bl, dl
   418 0000719F 2A1D[E6590100]      <1> 	sub	bl, [CursorColumn] 
   419 000071A5 B020                <1> 	mov	al, 20h
   420 000071A7 8883[365A0100]      <1> 	mov	[CommandBuffer+ebx], al
   421                              <1> 	;sub	bh, bh ; video page 0
   422                              <1> 	;mov	cx, 1
   423 000071AD B307                <1> 	mov	bl, 7 ; color attribute
   424 000071AF E88EAAFFFF          <1> 	call	_write_c_current ; 17/01/2016
   425                              <1> 	;mov	dx, [CURSOR_POSN]
   426 000071B4 EBC3                <1> 	jmp	short readnextchar
   427                              <1> loc_arrow:    
   428 000071B6 80FC4B              <1> 	cmp	ah, 4Bh
   429 000071B9 74D1                <1> 	je	short loc_back
   430 000071BB 80FC53              <1> 	cmp	ah, 53h
   431 000071BE 74CC                <1> 	je      short loc_back
   432 000071C0 80FC4D              <1> 	cmp	ah, 4Dh
   433 000071C3 75B4                <1> 	jne	short readnextchar
   434 000071C5 80FA4F              <1> 	cmp	dl, 79
   435 000071C8 73AF                <1> 	jnb	short readnextchar
   436 000071CA FEC2                <1> 	inc	dl
   437 000071CC EBC8                <1> 	jmp	short set_cursor_pos
   438                              <1> char_return:
   439 000071CE 0FB6DA              <1> 	movzx	ebx, dl
   440 000071D1 2A1D[E6590100]      <1> 	sub	bl, [CursorColumn] 
   441 000071D7 3C20                <1> 	cmp	al, 20h
   442 000071D9 721D                <1> 	jb	short loc_escape
   443 000071DB 8883[365A0100]      <1> 	mov	[CommandBuffer+ebx], al
   444 000071E1 80FA4F              <1> 	cmp	dl, 79
   445 000071E4 7393                <1> 	jnb	short readnextchar
   446 000071E6 66BB0700            <1> 	mov	bx, 7 ; color attribute
   447 000071EA E8CCAAFFFF          <1> 	call	_write_tty
   448 000071EF 668B15[DE580100]    <1> 	mov	dx, [CURSOR_POSN] ; video page 0
   449 000071F6 EB81                <1>         jmp     readnextchar
   450                              <1> loc_escape:
   451 000071F8 3C1B                <1> 	cmp	al, 1Bh
   452 000071FA 7418                <1> 	je	short rw_char_retn
   453                              <1> 	;
   454 000071FC 3C0D                <1> 	cmp	al, 0Dh ; CR
   455 000071FE 0F8575FFFFFF        <1>         jne     readnextchar
   456                              <1> 	; 13/05/2016
   457 00007204 66BB0700            <1> 	mov	bx, 7 ; attribute/color (bl)
   458                              <1> 		      ; video page 0 (bh=0)	
   459 00007208 E8AEAAFFFF          <1> 	call	_write_tty
   460                              <1> 	;mov	bx, 7  ; attribute/color
   461                              <1> 		      ; video page 0 (bh=0)
   462 0000720D B00A                <1> 	mov	al, 0Ah ; LF
   463 0000720F E8A7AAFFFF          <1> 	call	_write_tty
   464                              <1> rw_char_retn:
   465 00007214 C3                  <1> 	retn
   466                              <1> 
   467                              <1> show_date:
   468                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   469                              <1>         ; 2004-2005
   470                              <1> 
   471                              <1> 	;mov	ah, 04h
   472                              <1> 	;call	int1Ah
   473 00007215 E8A2E8FFFF          <1> 	call	RTC_40	; GET RTC DATE
   474                              <1> 
   475 0000721A 88D0                <1> 	mov	al, dl
   476 0000721C E8F599FFFF          <1>   	call	bcd_to_ascii
   477 00007221 66A3[A10E0100]      <1> 	mov	[Day], ax
   478                              <1> 
   479 00007227 88F0                <1> 	mov	al, dh
   480 00007229 E8E899FFFF          <1>   	call	bcd_to_ascii
   481 0000722E 66A3[A40E0100]      <1> 	mov	[Month], ax
   482                              <1> 
   483 00007234 88E8                <1> 	mov	al, ch
   484 00007236 E8DB99FFFF          <1>   	call	bcd_to_ascii
   485 0000723B 66A3[A70E0100]      <1> 	mov	[Century], ax
   486                              <1> 
   487 00007241 88C8                <1> 	mov	al, cl
   488 00007243 E8CE99FFFF          <1>   	call	bcd_to_ascii
   489 00007248 66A3[A90E0100]      <1> 	mov	word [Year], ax
   490                              <1> 
   491 0000724E BE[910E0100]        <1> 	mov	esi, Msg_Show_Date
   492 00007253 E875F1FFFF          <1> 	call	print_msg
   493                              <1> 
   494 00007258 C3                  <1> 	retn
   495                              <1> 
   496                              <1> set_date:
   497                              <1> 	; 13/05/2016
   498                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   499                              <1>         ; 2004-2005
   500                              <1> 
   501 00007259 BE[750E0100]        <1> 	mov	esi, Msg_Enter_Date
   502 0000725E E86AF1FFFF          <1> 	call	print_msg
   503                              <1> 
   504                              <1> loc_enter_day_1:
   505 00007263 30E4                <1> 	xor     ah, ah
   506 00007265 E8B599FFFF          <1> 	call	int16h
   507                              <1> 	; AL = ASCII Code of the Character
   508 0000726A 3C0D                <1> 	cmp	al, 13
   509 0000726C 0F84B7010000        <1> 	je	loc_set_date_retn
   510 00007272 3C1B                <1> 	cmp	al, 27
   511 00007274 0F84AF010000        <1> 	je	loc_set_date_retn
   512 0000727A A2[A10E0100]        <1> 	mov	[Day], al
   513 0000727F 3C30                <1> 	cmp	al, '0'
   514 00007281 0F82AD010000        <1> 	jb	loc_set_date_stc_0
   515 00007287 3C33                <1> 	cmp	al, '3'
   516 00007289 0F87A5010000        <1> 	ja	loc_set_date_stc_0
   517                              <1> 	; 13/05/2016
   518                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   519                              <1> 		      ; video page 0 (bh)	
   520 0000728F B307                <1> 	mov	bl, 7
   521 00007291 E825AAFFFF          <1> 	call	_write_tty
   522                              <1> loc_enter_day_2:
   523 00007296 30E4                <1> 	xor     ah, ah
   524 00007298 E88299FFFF          <1> 	call	int16h
   525                              <1> 	; AL = ASCII Code of the Character
   526 0000729D 3C1B                <1> 	cmp	al, 27
   527 0000729F 0F8484010000        <1>         je      loc_set_date_retn
   528 000072A5 A2[A20E0100]        <1> 	mov	[Day+1], al
   529 000072AA 3C30                <1> 	cmp	al, '0'
   530 000072AC 0F828C010000        <1>         jb      loc_set_date_stc_1
   531 000072B2 3C39                <1> 	cmp	al, '9'
   532 000072B4 0F8784010000        <1>         ja      loc_set_date_stc_1
   533 000072BA 803D[A10E0100]33    <1> 	cmp	byte [Day], '3'
   534 000072C1 7208                <1> 	jb	short pass_set_day_31
   535 000072C3 3C31                <1> 	cmp	al, '1'
   536 000072C5 0F8773010000        <1>         ja      loc_set_date_stc_1
   537                              <1> pass_set_day_31:
   538                              <1> 	; 13/05/2016
   539                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   540                              <1> 		      ; video page 0 (bh)	
   541 000072CB B307                <1> 	mov	bl, 7
   542 000072CD E8E9A9FFFF          <1> 	call	_write_tty
   543                              <1> loc_enter_separator_1:
   544 000072D2 28E4                <1> 	sub     ah, ah ; 0
   545 000072D4 E84699FFFF          <1> 	call	int16h
   546                              <1> 	; AL = ASCII Code of the Character
   547 000072D9 3C1B                <1> 	cmp	al, 27
   548 000072DB 0F8448010000        <1>         je      loc_set_date_retn
   549 000072E1 3C2D                <1> 	cmp	al, '-'
   550 000072E3 7408                <1> 	je	short pass_set_date_separator_1
   551 000072E5 3C2F                <1> 	cmp	al, '/'
   552 000072E7 0F856C010000        <1>         jne     loc_set_date_stc_2
   553                              <1> pass_set_date_separator_1:
   554                              <1> 	; 13/05/2016
   555                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   556                              <1> 		      ; video page 0 (bh)
   557 000072ED B307                <1> 	mov	bl, 7	
   558 000072EF E8C7A9FFFF          <1> 	call	_write_tty
   559                              <1> loc_enter_month_1:
   560 000072F4 30E4                <1> 	xor     ah, ah ; 0
   561 000072F6 E82499FFFF          <1> 	call	int16h
   562                              <1> 	; AL = ASCII Code of the Character
   563 000072FB 3C1B                <1> 	cmp	al, 27
   564 000072FD 0F8426010000        <1>         je      loc_set_date_retn
   565 00007303 A2[A40E0100]        <1> 	mov	[Month], al
   566 00007308 3C30                <1> 	cmp	al, '0'
   567 0000730A 0F8264010000        <1>         jb      loc_set_date_stc_3
   568 00007310 3C31                <1> 	cmp	al, '1'
   569 00007312 0F875C010000        <1>         ja      loc_set_date_stc_3
   570                              <1> 	; 13/05/2016
   571                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   572                              <1> 		      ; video page 0 (bh)	
   573 00007318 B307                <1> 	mov	bl, 7
   574 0000731A E89CA9FFFF          <1> 	call	_write_tty
   575                              <1> loc_enter_month_2:
   576 0000731F 30E4                <1> 	xor     ah, ah
   577 00007321 E8F998FFFF          <1> 	call	int16h
   578                              <1> 	; AL = ASCII Code of the Character
   579 00007326 3C1B                <1> 	cmp	al, 27
   580 00007328 0F84FB000000        <1>         je      loc_set_date_retn
   581 0000732E A2[A50E0100]        <1> 	mov	[Month+1], al
   582 00007333 3C30                <1> 	cmp	al, '0'
   583 00007335 0F8254010000        <1>         jb      loc_set_date_stc_4
   584 0000733B 3C39                <1> 	cmp	al, '9'
   585 0000733D 0F874C010000        <1>         ja      loc_set_date_stc_4
   586 00007343 803D[A40E0100]31    <1> 	cmp	byte [Month], '1'
   587 0000734A 7208                <1> 	jb	short pass_set_month_12
   588 0000734C 3C32                <1> 	cmp	al, '2'
   589 0000734E 0F873B010000        <1>         ja      loc_set_date_stc_4
   590                              <1> pass_set_month_12:
   591                              <1> 	; 13/05/2016
   592                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   593                              <1> 		      ; video page 0 (bh)
   594 00007354 B307                <1> 	mov	bl, 7	
   595 00007356 E860A9FFFF          <1> 	call	_write_tty
   596                              <1> loc_enter_separator_2:
   597 0000735B 28E4                <1> 	sub     ah, ah
   598 0000735D E8BD98FFFF          <1> 	call	int16h
   599                              <1> 	; AL = ASCII Code of the Character
   600 00007362 3C1B                <1> 	cmp	al, 27
   601 00007364 0F84BF000000        <1>         je      loc_set_date_retn
   602 0000736A 3C2D                <1> 	cmp	al, '-'
   603 0000736C 7408                <1> 	je	short pass_set_date_separator_2
   604 0000736E 3C2F                <1> 	cmp	al, '/'
   605 00007370 0F8534010000        <1>         jne     loc_set_date_stc_5
   606                              <1> pass_set_date_separator_2:
   607                              <1> 	; 13/05/2016
   608                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   609                              <1> 		      ; video page 0 (bh)	
   610 00007376 B307                <1> 	mov	bl, 7
   611 00007378 E83EA9FFFF          <1> 	call	_write_tty
   612                              <1> loc_enter_year_1:
   613 0000737D 30E4                <1> 	xor    ah, ah
   614 0000737F E89B98FFFF          <1> 	call	int16h
   615                              <1> 	; AL = ASCII Code of the Character
   616 00007384 3C1B                <1> 	cmp	al, 27
   617 00007386 0F849D000000        <1>         je      loc_set_date_retn
   618 0000738C A2[A90E0100]        <1> 	mov	[Year], al
   619 00007391 3C30                <1> 	cmp	al, '0'
   620 00007393 0F822C010000        <1>         jb      loc_set_date_stc_6
   621 00007399 3C39                <1> 	cmp	al, '9'
   622 0000739B 0F8724010000        <1>         ja      loc_set_date_stc_6
   623                              <1> 	; 13/05/2016
   624                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   625                              <1> 		      ; video page 0 (bh)
   626 000073A1 B307                <1> 	mov	bl, 7	
   627 000073A3 E813A9FFFF          <1> 	call	_write_tty
   628                              <1> loc_enter_year_2:
   629 000073A8 30E4                <1> 	xor	ah, ah
   630 000073AA E87098FFFF          <1> 	call	int16h
   631                              <1> 	; AL = ASCII Code of the Character
   632 000073AF 3C1B                <1> 	cmp	al, 27
   633 000073B1 7476                <1> 	je	short loc_set_date_retn
   634 000073B3 A2[AA0E0100]        <1> 	mov	byte [Year+1], al
   635 000073B8 3C30                <1> 	cmp	al, '0'
   636 000073BA 0F8220010000        <1>         jb      loc_set_date_stc_7
   637 000073C0 3C39                <1> 	cmp	al, '9'
   638 000073C2 0F8718010000        <1>         ja      loc_set_date_stc_7
   639                              <1> 	; 13/05/2016
   640                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   641                              <1> 		      ; video page 0 (bh)
   642 000073C8 B307                <1> 	mov	bl, 7	
   643 000073CA E8ECA8FFFF          <1> 	call	_write_tty
   644                              <1> loc_set_date_get_lchar_again:
   645 000073CF 28E4                <1> 	sub	ah, ah ; 0
   646 000073D1 E84998FFFF          <1> 	call	int16h
   647                              <1> 	; AL = ASCII Code of the Character
   648 000073D6 3C0D                <1> 	cmp	al, 13 ; ENTER key
   649 000073D8 7412                <1> 	je	short loc_set_date_progress
   650 000073DA 3C1B                <1> 	cmp	al, 27 ; ESC key
   651 000073DC 744B                <1> 	je	short loc_set_date_retn
   652                              <1> 	;
   653 000073DE E82A010000          <1> 	call	check_for_backspace
   654 000073E3 75EA                <1> 	jne	short loc_set_date_get_lchar_again
   655                              <1> 
   656                              <1> loc_set_date_bs_8:
   657 000073E5 E811010000          <1> 	call	write_backspace
   658 000073EA EBBC                <1> 	jmp	short loc_enter_year_2
   659                              <1> 
   660                              <1> loc_set_date_progress:
   661                              <1> 	; Get Current Date
   662                              <1> 	;mov	ah, 04h
   663                              <1> 	;call	int1Ah
   664 000073EC E8CBE6FFFF          <1> 	call	RTC_40	; GET RTC DATE
   665                              <1> 	; CH = century (in BCD)
   666                              <1> 
   667 000073F1 66A1[A90E0100]      <1> 	mov	ax, [Year]
   668 000073F7 662D3030            <1> 	sub	ax, '00'
   669 000073FB C0E004              <1> 	shl	al, 4 ; * 16
   670 000073FE 88C1                <1> 	mov	cl, al
   671 00007400 00E1                <1> 	add	cl, ah
   672 00007402 66A1[A40E0100]      <1> 	mov	ax, [Month]
   673 00007408 662D3030            <1> 	sub	ax, '00'
   674 0000740C C0E004              <1> 	shl	al, 4 ; * 16
   675 0000740F 88C6                <1> 	mov	dh, al
   676 00007411 00E6                <1> 	add	dh, ah
   677 00007413 66A1[A10E0100]      <1> 	mov	ax, [Day]
   678 00007419 662D3030            <1> 	sub	ax, '00'
   679 0000741D C0E004              <1> 	shl	al, 4 ; * 16
   680 00007420 88C2                <1> 	mov	dl, al
   681 00007422 00E2                <1> 	add	dl, ah
   682                              <1> 
   683                              <1> 	;mov	ah, 05h
   684                              <1> 	;call	int1Ah
   685 00007424 E8C0E6FFFF          <1> 	call	RTC_50	; SET RTC DATE
   686                              <1> 
   687                              <1> loc_set_date_retn:
   688 00007429 BE[FF190100]        <1> 	mov	esi, nextline
   689 0000742E E89AEFFFFF          <1> 	call	print_msg
   690 00007433 C3                  <1> 	retn
   691                              <1> 
   692                              <1> loc_set_date_stc_0:
   693                              <1> 	;xor	bh, bh ; video page 0
   694 00007434 E862A9FFFF          <1> 	call	beeper ; BEEP !
   695 00007439 E925FEFFFF          <1>         jmp     loc_enter_day_1
   696                              <1> loc_set_date_stc_1:
   697 0000743E E8CA000000          <1> 	call	check_for_backspace
   698 00007443 740A                <1> 	je	short loc_set_date_bs_1
   699                              <1> 	;xor	bh, bh ; video page 0
   700 00007445 E851A9FFFF          <1> 	call	beeper ; BEEP !
   701 0000744A E947FEFFFF          <1>         jmp     loc_enter_day_2
   702                              <1> loc_set_date_bs_1:
   703 0000744F E8A7000000          <1> 	call	write_backspace
   704 00007454 E90AFEFFFF          <1>         jmp     loc_enter_day_1
   705                              <1> loc_set_date_stc_2:
   706 00007459 E8AF000000          <1> 	call	check_for_backspace
   707 0000745E 740A                <1> 	je	short loc_set_date_bs_2
   708                              <1> 	;xor	bh, bh ; video page 0
   709 00007460 E836A9FFFF          <1> 	call	beeper ; BEEP !
   710 00007465 E968FEFFFF          <1>         jmp     loc_enter_separator_1
   711                              <1> loc_set_date_bs_2:
   712 0000746A E88C000000          <1> 	call	write_backspace
   713 0000746F E922FEFFFF          <1>         jmp     loc_enter_day_2
   714                              <1> loc_set_date_stc_3:
   715 00007474 E894000000          <1> 	call	check_for_backspace	
   716 00007479 740A                <1> 	je short loc_set_date_bs_3
   717                              <1> 	;xor	bh, bh ; video page 0
   718 0000747B E81BA9FFFF          <1> 	call	beeper ; BEEP !
   719 00007480 E96FFEFFFF          <1>         jmp     loc_enter_month_1
   720                              <1> loc_set_date_bs_3:
   721 00007485 E871000000          <1> 	call	write_backspace
   722 0000748A E943FEFFFF          <1>         jmp     loc_enter_separator_1
   723                              <1> loc_set_date_stc_4:
   724 0000748F E879000000          <1> 	call	check_for_backspace	
   725 00007494 740A                <1> 	je	short loc_set_date_bs_4
   726                              <1> 	;xor	bh, bh ; video page 0
   727 00007496 E800A9FFFF          <1> 	call	beeper ; BEEP !
   728 0000749B E97FFEFFFF          <1>         jmp     loc_enter_month_2
   729                              <1> loc_set_date_bs_4:
   730 000074A0 E856000000          <1> 	call	write_backspace
   731 000074A5 E94AFEFFFF          <1>         jmp     loc_enter_month_1
   732                              <1> loc_set_date_stc_5:
   733 000074AA E85E000000          <1> 	call	check_for_backspace
   734 000074AF 740A                <1> 	je	short loc_set_date_bs_5
   735                              <1> 	;xor	bh, bh ; video page 0
   736 000074B1 E8E5A8FFFF          <1> 	call	beeper ; BEEP !
   737 000074B6 E9A0FEFFFF          <1>         jmp     loc_enter_separator_2
   738                              <1> loc_set_date_bs_5:
   739 000074BB E83B000000          <1> 	call	write_backspace
   740 000074C0 E95AFEFFFF          <1>         jmp     loc_enter_month_2
   741                              <1> loc_set_date_stc_6:
   742 000074C5 E843000000          <1> 	call	check_for_backspace
   743 000074CA 740A                <1>         je      short  loc_set_date_bs_6
   744                              <1> 	;xor	bh, bh ; video page 0
   745 000074CC E8CAA8FFFF          <1> 	call	beeper ; BEEP !
   746 000074D1 E9A7FEFFFF          <1>         jmp     loc_enter_year_1
   747                              <1> loc_set_date_bs_6:
   748 000074D6 E820000000          <1> 	call	write_backspace
   749 000074DB E97BFEFFFF          <1>         jmp     loc_enter_separator_2
   750                              <1> loc_set_date_stc_7:
   751 000074E0 E828000000          <1> 	call	check_for_backspace
   752 000074E5 740A                <1> 	je	short loc_set_date_bs_7
   753                              <1> 	;xor	bh, bh ; video page 0
   754 000074E7 E8AFA8FFFF          <1> 	call	beeper ; BEEP !
   755 000074EC E9B7FEFFFF          <1>         jmp     loc_enter_year_2
   756                              <1> loc_set_date_bs_7:
   757 000074F1 E805000000          <1> 	call	write_backspace
   758 000074F6 E982FEFFFF          <1>         jmp     loc_enter_year_1
   759                              <1> 
   760                              <1> write_backspace:
   761                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   762 000074FB B008                <1> 	mov	al, 08h ; BACKSPACE
   763                              <1> 	; 13/05/2016
   764 000074FD 66BB0700            <1> 	mov	bx, 7 ; bl = attribute/color
   765                              <1> 		      ; bh = video page = 0	
   766 00007501 E8B5A7FFFF          <1> 	call	_write_tty
   767 00007506 B020                <1> 	mov	al, 20h ; BLANK/SPACE char 
   768                              <1> 	;mov	bx, 7 ; attribute/color
   769                              <1> 	;call	_write_c_current
   770                              <1> 	;retn
   771 00007508 E935A7FFFF          <1> 	jmp	_write_c_current
   772                              <1> 
   773                              <1> check_for_backspace:
   774                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   775 0000750D 663D080E            <1> 	cmp	ax, 0E08h
   776 00007511 7410                <1> 	je	short cfbs_retn
   777 00007513 663DE04B            <1> 	cmp	ax, 4BE0h
   778 00007517 740A                <1> 	je	short cfbs_retn
   779 00007519 663D004B            <1> 	cmp	ax, 4B00h
   780 0000751D 7404                <1> 	je	short cfbs_retn
   781 0000751F 663DE053            <1> 	cmp	ax, 53E0h
   782                              <1> cfbs_retn:
   783 00007523 C3                  <1> 	retn
   784                              <1> 
   785                              <1> show_time:
   786                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   787                              <1>         ; 2004-2005
   788                              <1> 
   789                              <1> 	;mov	ah, 02h
   790                              <1> 	;call	int1Ah
   791 00007524 E822E5FFFF          <1> 	call	RTC_20	; GET RTC TIME
   792                              <1> 	
   793 00007529 88E8                <1> 	mov	al, ch
   794 0000752B E8E696FFFF          <1> 	call	bcd_to_ascii
   795 00007530 66A3[CF0E0100]      <1> 	mov	[Hour], ax
   796                              <1> 
   797 00007536 88C8                <1> 	mov	al, cl
   798 00007538 E8D996FFFF          <1> 	call	bcd_to_ascii
   799 0000753D 66A3[D20E0100]      <1> 	mov	[Minute], ax
   800                              <1> 
   801 00007543 88F0                <1> 	mov	al, dh
   802 00007545 E8CC96FFFF          <1> 	call	bcd_to_ascii
   803 0000754A 66A3[D50E0100]      <1> 	mov	[Second], ax
   804                              <1> 
   805 00007550 BE[BF0E0100]        <1> 	mov	esi, Msg_Show_Time
   806 00007555 E873EEFFFF          <1> 	call	print_msg
   807 0000755A C3                  <1> 	retn
   808                              <1> 
   809                              <1> set_time:
   810                              <1> 	; 13/05/2016
   811                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
   812                              <1>         ; 2004-2005
   813                              <1> 
   814 0000755B BE[AE0E0100]        <1> 	mov 	esi, Msg_Enter_Time
   815 00007560 E868EEFFFF          <1> 	call	print_msg
   816                              <1> 
   817                              <1> loc_enter_hour_1:
   818 00007565 30E4                <1> 	xor     ah, ah
   819 00007567 E8B396FFFF          <1> 	call	int16h
   820                              <1> 	; AL = ASCII Code of the Character
   821 0000756C 3C0D                <1> 	cmp	al, 13 ; ENTER key
   822 0000756E 0F84AE010000        <1>         je      loc_set_time_retn
   823 00007574 3C1B                <1> 	cmp	al, 27 ; ESC key
   824 00007576 0F84A6010000        <1>         je      loc_set_time_retn
   825 0000757C A2[CF0E0100]        <1> 	mov	[Hour], al
   826 00007581 3C30                <1> 	cmp	al, '0'
   827 00007583 0F82A4010000        <1>         jb      loc_set_time_stc_0
   828 00007589 3C32                <1> 	cmp	al, '2'
   829 0000758B 0F879C010000        <1>         ja      loc_set_time_stc_0
   830                              <1> 	; 13/05/2016
   831                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   832                              <1> 		      ; video page 0 (bh)
   833 00007591 B307                <1> 	mov	bl, 7	
   834 00007593 E823A7FFFF          <1> 	call	_write_tty
   835                              <1> loc_enter_hour_2:
   836 00007598 30E4                <1> 	xor     ah, ah
   837 0000759A E88096FFFF          <1> 	call	int16h
   838                              <1> 	; AL = ASCII Code of the Character
   839 0000759F 3C1B                <1> 	cmp	al, 27
   840 000075A1 0F847B010000        <1>         je      loc_set_time_retn
   841 000075A7 A2[D00E0100]        <1> 	mov	[Hour+1], al
   842 000075AC 3C30                <1> 	cmp	al, '0'
   843 000075AE 0F8283010000        <1>         jb      loc_set_time_stc_1
   844 000075B4 3C39                <1> 	cmp	al, '9'
   845 000075B6 0F877B010000        <1> 	ja	loc_set_time_stc_1
   846 000075BC 803D[CF0E0100]32    <1>         cmp     byte [Hour], '2'
   847 000075C3 7208                <1> 	jb	short pass_set_time_24
   848 000075C5 3C34                <1> 	cmp	al, '4'
   849 000075C7 0F876A010000        <1>         ja      loc_set_time_stc_1
   850                              <1> pass_set_time_24:
   851                              <1> 	; 13/05/2016
   852                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   853                              <1> 		      ; video page 0 (bh)
   854 000075CD B307                <1> 	mov	bl, 7	
   855 000075CF E8E7A6FFFF          <1> 	call	_write_tty
   856                              <1> loc_enter_time_separator_1:
   857 000075D4 28E4                <1> 	sub    ah, ah ; 0
   858 000075D6 E84496FFFF          <1> 	call	int16h
   859                              <1> 	; AL = ASCII Code of the Character
   860 000075DB 3C1B                <1> 	cmp	al, 27
   861 000075DD 0F843F010000        <1>         je      loc_set_time_retn
   862 000075E3 3C3A                <1> 	cmp	al, ':'
   863 000075E5 0F8567010000        <1>         jne     loc_set_time_stc_2
   864                              <1> 	; 13/05/2016
   865                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   866                              <1> 		      ; video page 0 (bh)
   867 000075EB B307                <1> 	mov	bl, 7	
   868 000075ED E8C9A6FFFF          <1> 	call	_write_tty
   869                              <1> loc_enter_minute_1:
   870 000075F2 30E4                <1> 	xor     ah, ah
   871 000075F4 E82696FFFF          <1> 	call	int16h
   872                              <1> 	; AL = ASCII Code of the Character
   873 000075F9 3C1B                <1> 	cmp	al, 27
   874 000075FB 0F8421010000        <1>         je      loc_set_time_retn
   875 00007601 A2[D20E0100]        <1> 	mov	[Minute], al
   876 00007606 3C30                <1> 	cmp	al, '0'
   877 00007608 0F825F010000        <1>         jb      loc_set_time_stc_3
   878 0000760E 3C35                <1> 	cmp	al, '5'
   879 00007610 0F8757010000        <1>         ja      loc_set_time_stc_3
   880                              <1> 	; 13/05/2016
   881                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   882                              <1> 		      ; video page 0 (bh)
   883 00007616 B307                <1> 	mov	bl, 7	
   884 00007618 E89EA6FFFF          <1> 	call	_write_tty
   885                              <1> loc_enter_minute_2:
   886 0000761D 30E4                <1> 	xor     ah, ah
   887 0000761F E8FB95FFFF          <1> 	call	int16h
   888                              <1> 	; AL = ASCII Code of the Character
   889 00007624 3C1B                <1> 	cmp	al, 27
   890 00007626 0F84F6000000        <1>         je      loc_set_time_retn
   891 0000762C A2[D30E0100]        <1> 	mov	[Minute+1], al
   892 00007631 3C30                <1> 	cmp	al, '0'
   893 00007633 0F824F010000        <1>         jb      loc_set_time_stc_4
   894 00007639 3C39                <1> 	cmp	al, '9'
   895 0000763B 0F8747010000        <1>         ja      loc_set_time_stc_4
   896                              <1> 	; 13/05/2016
   897                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   898                              <1> 		      ; video page 0 (bh)
   899 00007641 B307                <1> 	mov	bl, 7	
   900 00007643 E873A6FFFF          <1> 	call	_write_tty
   901                              <1> loc_enter_time_separator_2:
   902 00007648 66C705[D50E0100]30- <1> 	mov	word [Second], 3030h
   902 00007650 30                  <1>
   903 00007651 28E4                <1> 	sub     ah, ah
   904 00007653 E8C795FFFF          <1> 	call	int16h
   905                              <1> 	; AL = ASCII Code of the Character
   906 00007658 3C0D                <1> 	cmp	al, 13
   907 0000765A 0F8485000000        <1>         je      loc_set_time_progress
   908 00007660 3C1B                <1> 	cmp	al, 27
   909 00007662 0F84BA000000        <1>         je      loc_set_time_retn
   910 00007668 3C3A                <1> 	cmp	al, ':'
   911 0000766A 0F8533010000        <1>         jne     loc_set_time_stc_5
   912                              <1> 	; 13/05/2016
   913                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   914                              <1> 		      ; video page 0 (bh)
   915 00007670 B307                <1> 	mov	bl, 7	
   916 00007672 E844A6FFFF          <1> 	call	_write_tty
   917                              <1> loc_enter_second_1:
   918 00007677 30E4                <1> 	xor     ah, ah
   919 00007679 E8A195FFFF          <1> 	call	int16h
   920                              <1> 	; AL = ASCII Code of the Character
   921 0000767E 3C0D                <1> 	cmp	al, 13
   922 00007680 7463                <1> 	je	short loc_set_time_progress
   923 00007682 3C1B                <1> 	cmp	al, 27
   924 00007684 0F8498000000        <1>         je      loc_set_time_retn
   925 0000768A A2[D50E0100]        <1> 	mov	[Second], al
   926 0000768F 3C30                <1> 	cmp	al, '0'
   927 00007691 0F8227010000        <1>         jb      loc_set_time_stc_6
   928 00007697 3C35                <1> 	cmp	al, '5'
   929 00007699 0F871F010000        <1>         ja      loc_set_time_stc_6
   930                              <1> 	; 13/05/2016
   931                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   932                              <1> 		      ; video page 0 (bh)
   933 0000769F B307                <1> 	mov	bl, 7	
   934 000076A1 E815A6FFFF          <1> 	call	_write_tty
   935                              <1> loc_enter_second_2:
   936 000076A6 30E4                <1> 	xor     ah, ah
   937 000076A8 E87295FFFF          <1> 	call	int16h
   938                              <1> 	; AL = ASCII Code of the Character
   939 000076AD 3C1B                <1> 	cmp	al, 27
   940 000076AF 7471                <1> 	je	short loc_set_time_retn
   941 000076B1 3C30                <1> 	cmp	al, '0'
   942 000076B3 0F8229010000        <1>         jb      loc_set_time_stc_7
   943 000076B9 3C39                <1> 	cmp	al, '9'
   944 000076BB 0F8721010000        <1>         ja      loc_set_time_stc_7
   945                              <1> 	; 13/05/2016
   946                              <1> 	;mov	bx, 7 ; attribute/color (bl)
   947                              <1> 		      ; video page 0 (bh)
   948 000076C1 B307                <1> 	mov	bl, 7	
   949 000076C3 E8F3A5FFFF          <1> 	call	_write_tty
   950                              <1> loc_set_time_get_lchar_again:
   951 000076C8 28E4                <1> 	sub	ah, ah ; 0
   952 000076CA E85095FFFF          <1> 	call	int16h
   953                              <1> 	; AL = ASCII Code of the Character
   954 000076CF 3C0D                <1> 	cmp	al, 13
   955 000076D1 7412                <1> 	je	short loc_set_time_progress
   956 000076D3 3C1B                <1> 	cmp	al, 27
   957 000076D5 744B                <1> 	je	short loc_set_time_retn
   958                              <1> 	;
   959 000076D7 E831FEFFFF          <1> 	call	check_for_backspace
   960 000076DC 75EA                <1> 	jne	short loc_set_time_get_lchar_again
   961                              <1> 
   962                              <1> loc_set_time_bs_8:
   963 000076DE E818FEFFFF          <1> 	call	write_backspace
   964 000076E3 EBC1                <1> 	jmp	short loc_enter_second_2
   965                              <1> 
   966                              <1> loc_set_time_progress:
   967                              <1> 	; Get Current Time
   968                              <1> 	;mov 	ah, 02h
   969                              <1> 	;call	int1Ah
   970 000076E5 E861E3FFFF          <1> 	call	RTC_20	; GET RTC TIME
   971                              <1> 	;DL = Daylight Savings Enable option (0-1)	
   972                              <1> 
   973 000076EA 66A1[CF0E0100]      <1> 	mov	ax, [Hour]
   974 000076F0 662D3030            <1> 	sub	ax, '00'
   975 000076F4 C0E004              <1> 	shl	al, 4 ; * 16
   976 000076F7 88C5                <1> 	mov	ch, al
   977 000076F9 00E5                <1> 	add	ch, ah
   978 000076FB 66A1[D20E0100]      <1> 	mov	ax, [Minute]
   979 00007701 662D3030            <1> 	sub	ax, '00'
   980 00007705 C0E004              <1> 	shl	al, 4 ; * 16
   981 00007708 88C1                <1> 	mov	cl, al
   982 0000770A 00E1                <1> 	add	cl, ah
   983 0000770C 66A1[D50E0100]      <1> 	mov	ax, [Second]
   984 00007712 662D3030            <1> 	sub	ax, '00'
   985 00007716 C0E004              <1> 	shl	al, 4 ; * 16
   986 00007719 88C6                <1> 	mov	dh, al
   987 0000771B 00E6                <1> 	add	dh, ah
   988                              <1> 	
   989                              <1> 	;mov	ah, 03h
   990                              <1> 	;call	int1Ah
   991 0000771D E858E3FFFF          <1> 	call	RTC_30	; SET RTC TIME
   992                              <1> 
   993                              <1> loc_set_time_retn:
   994 00007722 BE[FF190100]        <1> 	mov 	esi, nextline
   995 00007727 E8A1ECFFFF          <1> 	call	print_msg
   996 0000772C C3                  <1> 	retn
   997                              <1> 
   998                              <1> loc_set_time_stc_0:
   999                              <1> 	;xor	bh, bh ; video page 0
  1000 0000772D E869A6FFFF          <1> 	call	beeper ; BEEP !
  1001 00007732 E92EFEFFFF          <1>         jmp     loc_enter_hour_1
  1002                              <1> loc_set_time_stc_1:
  1003 00007737 E8D1FDFFFF          <1> 	call	check_for_backspace
  1004 0000773C 740A                <1> 	je	short loc_set_time_bs_1
  1005                              <1> 	;xor	bh, bh ; video page 0
  1006 0000773E E858A6FFFF          <1> 	call	beeper ; BEEP !
  1007 00007743 E950FEFFFF          <1>         jmp     loc_enter_hour_2
  1008                              <1> loc_set_time_bs_1:
  1009 00007748 E8AEFDFFFF          <1> 	call	write_backspace
  1010 0000774D E913FEFFFF          <1>         jmp     loc_enter_hour_1
  1011                              <1> loc_set_time_stc_2:
  1012 00007752 E8B6FDFFFF          <1> 	call	check_for_backspace
  1013 00007757 740A                <1> 	je	short loc_set_time_bs_2
  1014                              <1> 	;xor	bh, bh ; video page 0
  1015 00007759 E83DA6FFFF          <1> 	call	beeper ; BEEP !
  1016 0000775E E971FEFFFF          <1>         jmp     loc_enter_time_separator_1
  1017                              <1> loc_set_time_bs_2:
  1018 00007763 E893FDFFFF          <1> 	call	write_backspace
  1019 00007768 E92BFEFFFF          <1>         jmp     loc_enter_hour_2
  1020                              <1> loc_set_time_stc_3:
  1021 0000776D E89BFDFFFF          <1> 	call	check_for_backspace
  1022 00007772 740A                <1> 	je	short loc_set_time_bs_3
  1023                              <1> 	;xor	bh, bh ; video page 0
  1024 00007774 E822A6FFFF          <1> 	call	beeper ; BEEP !6
  1025 00007779 E974FEFFFF          <1>         jmp     loc_enter_minute_1
  1026                              <1> loc_set_time_bs_3:
  1027 0000777E E878FDFFFF          <1> 	call	write_backspace
  1028 00007783 E94CFEFFFF          <1>         jmp     loc_enter_time_separator_1
  1029                              <1> loc_set_time_stc_4:
  1030 00007788 E880FDFFFF          <1> 	call	check_for_backspace
  1031 0000778D 740A                <1> 	je	short loc_set_time_bs_4
  1032                              <1> 	;xor	bh, bh ; video page 0
  1033 0000778F E807A6FFFF          <1> 	call	beeper ; BEEP !
  1034 00007794 E984FEFFFF          <1>         jmp     loc_enter_minute_2
  1035                              <1> loc_set_time_bs_4:
  1036 00007799 E85DFDFFFF          <1> 	call	write_backspace
  1037 0000779E E94FFEFFFF          <1>         jmp     loc_enter_minute_1
  1038                              <1> loc_set_time_stc_5:
  1039 000077A3 E865FDFFFF          <1> 	call	check_for_backspace
  1040 000077A8 740A                <1> 	je	short loc_set_time_bs_5
  1041                              <1> 	;xor	bh, bh ; video page 0
  1042 000077AA E8ECA5FFFF          <1> 	call	beeper ; BEEP !
  1043 000077AF E994FEFFFF          <1>         jmp     loc_enter_time_separator_2
  1044                              <1> loc_set_time_bs_5:
  1045 000077B4 E842FDFFFF          <1> 	call	write_backspace
  1046 000077B9 E95FFEFFFF          <1>         jmp     loc_enter_minute_2
  1047                              <1> loc_set_time_stc_6:
  1048 000077BE E84AFDFFFF          <1> 	call	check_for_backspace
  1049 000077C3 7413                <1> 	je	short loc_set_time_bs_6
  1050                              <1> 	;xor	bh, bh ; video page 0
  1051 000077C5 E8D1A5FFFF          <1> 	call	beeper ; BEEP !
  1052 000077CA 66C705[D50E0100]30- <1> 	mov	word [Second], 3030h
  1052 000077D2 30                  <1>
  1053 000077D3 E99FFEFFFF          <1>         jmp     loc_enter_second_1
  1054                              <1> loc_set_time_bs_6:
  1055 000077D8 E81EFDFFFF          <1> 	call	write_backspace
  1056 000077DD E966FEFFFF          <1>         jmp     loc_enter_time_separator_2
  1057                              <1> loc_set_time_stc_7:
  1058 000077E2 E826FDFFFF          <1> 	call	check_for_backspace
  1059 000077E7 740A                <1> 	je	short loc_set_time_bs_7
  1060                              <1> 	;xor	bh, bh ; video page 0
  1061 000077E9 E8ADA5FFFF          <1> 	call	beeper ; BEEP !
  1062 000077EE E9B3FEFFFF          <1>         jmp     loc_enter_second_2
  1063                              <1> loc_set_time_bs_7:
  1064 000077F3 E803FDFFFF          <1> 	call	write_backspace
  1065 000077F8 E97AFEFFFF          <1>         jmp     loc_enter_second_1
  1066                              <1> 
  1067                              <1> print_volume_info:
  1068                              <1> 	; 01/03/2016
  1069                              <1> 	; 08/02/2016
  1070                              <1> 	; 06/02/2016
  1071                              <1> 	; 04/02/2016
  1072                              <1> 	; 18/01/2016 (TRDOS 386 = TRDOS v2.0)
  1073                              <1> 	; 25/10/2009
  1074                              <1> 	;
  1075                              <1> 	; "Volume Serial No: "
  1076                              <1>  	;
  1077                              <1> 	; INPUT  : AL = DOS Drive Number
  1078                              <1> 	; OUTPUT : AH = FS Type
  1079                              <1> 	;          AL = DOS Drive Name
  1080                              <1> 	; CF = 0 -> OK
  1081                              <1> 	; CF = 1 -> Drive not ready 
  1082                              <1> 
  1083 000077FD 88C4                <1> 	mov	ah, al
  1084 000077FF 28C0                <1> 	sub	al, al
  1085 00007801 0FB7F0              <1> 	movzx	esi, ax	
  1086 00007804 81C600010900        <1> 	add	esi, Logical_DOSDisks
  1087 0000780A 8A06                <1> 	mov	al, [esi]
  1088 0000780C 3C41                <1> 	cmp	al, 'A'  
  1089 0000780E 7304                <1> 	jnb	short loc_pvi_set_vol_name
  1090 00007810 8A6604              <1> 	mov	ah, [esi+LD_FSType]
  1091 00007813 C3                  <1> 	retn
  1092                              <1> 
  1093                              <1> loc_pvi_set_vol_name:
  1094 00007814 A2[090F0100]        <1> 	mov	[Vol_Drv_Name], al
  1095 00007819 56                  <1> 	push	esi
  1096 0000781A E858010000          <1> 	call	move_volume_name_and_serial_no ;;;
  1097 0000781F 7302                <1> 	jnc	short loc_pvi_mvn_ok
  1098 00007821 5E                  <1> 	pop	esi
  1099 00007822 C3                  <1> 	retn
  1100                              <1> 
  1101                              <1> loc_pvi_mvn_ok:
  1102 00007823 8B3424              <1> 	mov	esi, [esp]
  1103 00007826 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  1104 0000782A 7509                <1> 	jne	short loc_pvi_fat_vol_size
  1105 0000782C 8B4670              <1> 	mov	eax, [esi+LD_FS_VolumeSize]
  1106 0000782F 0FB75E11            <1> 	movzx	ebx, word [esi+LD_FS_BytesPerSec]
  1107 00007833 EB07                <1> 	jmp	short loc_vol_size_mul32
  1108                              <1> loc_pvi_fat_vol_size:
  1109 00007835 8B4670              <1> 	mov	eax, [esi+LD_TotalSectors]
  1110 00007838 0FB75E11            <1> 	movzx	ebx, word [esi+LD_BPB+BPB_BytsPerSec]
  1111                              <1> loc_vol_size_mul32:
  1112 0000783C F7E3                <1> 	mul	ebx
  1113 0000783E 09D2                <1> 	or	edx, edx
  1114 00007840 7507                <1> 	jnz	short loc_vol_size_in_kbytes
  1115                              <1> loc_vol_size_in_bytes:
  1116 00007842 B9[E70E0100]        <1> 	mov	ecx, VolSize_Bytes
  1117 00007847 EB0D                <1> 	jmp	short loc_write_vol_size_str
  1118                              <1> loc_vol_size_in_kbytes:
  1119 00007849 66BB0004            <1> 	mov	bx, 1024
  1120 0000784D F7F3                <1> 	div	ebx
  1121 0000784F B9[DA0E0100]        <1> 	mov 	ecx, VolSize_KiloBytes
  1122 00007854 31D2                <1> 	xor	edx, edx ; 0
  1123                              <1> loc_write_vol_size_str:
  1124 00007856 890D[BB600100]      <1> 	mov	[VolSize_Unit1], ecx
  1125                              <1> 	; 
  1126 0000785C BF[D1600100]        <1> 	mov	edi, Vol_Tot_Sec_Str_End
  1127                              <1>         ;mov	byte [edi], 0
  1128 00007861 B90A000000          <1> 	mov	ecx, 10
  1129                              <1> loc_write_vol_size_chr:
  1130 00007866 F7F1                <1> 	div	ecx
  1131 00007868 80C230              <1> 	add	dl, '0'
  1132 0000786B 4F                  <1> 	dec	edi	
  1133 0000786C 8817                <1> 	mov	[edi], dl
  1134 0000786E 85C0                <1> 	test	eax, eax
  1135 00007870 7404                <1> 	jz	short loc_write_vol_size_str_ok
  1136 00007872 28D2                <1> 	sub	dl, dl ; 0
  1137 00007874 EBF0                <1> 	jmp	short loc_write_vol_size_chr
  1138                              <1> 
  1139                              <1> loc_write_vol_size_str_ok:
  1140 00007876 893D[C3600100]      <1> 	mov	[Vol_Tot_Sec_Str_Start], edi
  1141                              <1> 	;
  1142 0000787C BF[F20E0100]        <1> 	mov	edi, Vol_FS_Name
  1143 00007881 8A4E03              <1> 	mov	cl, [esi+LD_FATType]
  1144 00007884 20C9                <1> 	and	cl, cl ; 0 ?
  1145 00007886 7515                <1> 	jnz	short loc_write_vol_FAT_str_1
  1146 00007888 66C7075452          <1> 	mov	word [edi], 'TR'
  1147 0000788D C7470420465331      <1> 	mov	dword [edi+4], ' FS1'
  1148                              <1> 	;movzx	ebx, word [esi+LD_FS_BytesPerSec]
  1149 00007894 668B5E11            <1> 	mov	bx, [esi+LD_FS_BytesPerSec]
  1150 00007898 8B4674              <1> 	mov	eax, [esi+LD_FS_FreeSectors]
  1151 0000789B EB36                <1> 	jmp	short loc_vol_freespace_mul32
  1152                              <1> 
  1153                              <1> loc_write_vol_FAT_str_1:
  1154 0000789D 66B83332            <1> 	mov	ax, '32' ; FAT32
  1155 000078A1 80F902              <1> 	cmp	cl, 2 ; [esi+LD_FATType]
  1156 000078A4 7708                <1> 	ja	short loc_write_vol_FAT_str_2
  1157 000078A6 66B83132            <1> 	mov	ax, '12' ; FAT12
  1158 000078AA 7202                <1> 	jb	short loc_write_vol_FAT_str_2
  1159 000078AC B436                <1> 	mov	ah, '6'  ; FAT16
  1160                              <1> loc_write_vol_FAT_str_2:
  1161 000078AE C70746415420        <1> 	mov	dword [edi], 'FAT '
  1162 000078B4 66894704            <1> 	mov	word [edi+4], ax
  1163                              <1> 	;
  1164                              <1> 	;movzx	ebx, word [esi+LD_BPB+BPB_BytsPerSec]
  1165 000078B8 668B5E11            <1> 	mov	bx, [esi+LD_BPB+BPB_BytsPerSec]
  1166 000078BC 8B4674              <1> 	mov	eax, [esi+LD_FreeSectors]
  1167                              <1> 
  1168                              <1> loc_vol_freespace_recalc0:
  1169                              <1> 	; 01/03/2016
  1170 000078BF 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh
  1171 000078C2 720F                <1> 	jb	short loc_vol_freespace_mul32
  1172                              <1> 	;inc	eax ; 0
  1173 000078C4 20C9                <1> 	and	cl, cl ; byte [esi+LD_FATType]
  1174 000078C6 740B                <1> 	jz	short loc_vol_freespace_mul32 	
  1175 000078C8 53                  <1> 	push	ebx
  1176 000078C9 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free sectors
  1177 000078CD E876490000          <1> 	call	calculate_fat_freespace
  1178 000078D2 5B                  <1> 	pop	ebx
  1179                              <1> 
  1180                              <1> loc_vol_freespace_mul32:
  1181 000078D3 F7E3                <1> 	mul	ebx
  1182 000078D5 09D2                <1> 	or	edx, edx
  1183 000078D7 7507                <1> 	jnz	short loc_vol_fspace_in_kbytes
  1184                              <1> loc_vol_fspace_in_bytes:
  1185 000078D9 B9[E70E0100]        <1> 	mov	ecx, VolSize_Bytes
  1186 000078DE EB0D                <1> 	jmp	short loc_write_vol_fspace_str
  1187                              <1> loc_vol_fspace_in_kbytes:
  1188 000078E0 66BB0004            <1> 	mov	bx, 1024
  1189 000078E4 F7F3                <1> 	div	ebx
  1190 000078E6 B9[DA0E0100]        <1> 	mov 	ecx, VolSize_KiloBytes
  1191 000078EB 31D2                <1> 	xor	edx, edx ; 0
  1192                              <1> loc_write_vol_fspace_str:
  1193 000078ED 890D[BF600100]      <1> 	mov	[VolSize_Unit2], ecx
  1194                              <1> 	;	
  1195 000078F3 BF[E1600100]        <1> 	mov	edi, Vol_Free_Sectors_Str_End
  1196                              <1>         ;mov	byte [edi], 0
  1197 000078F8 B90A000000          <1> 	mov	ecx, 10
  1198                              <1> loc_write_vol_fspace_chr:
  1199 000078FD F7F1                <1> 	div	ecx
  1200 000078FF 80C230              <1> 	add	dl, '0'
  1201 00007902 4F                  <1> 	dec	edi	
  1202 00007903 8817                <1> 	mov	[edi], dl
  1203 00007905 85C0                <1> 	test	eax, eax
  1204 00007907 7404                <1> 	jz	short loc_write_vol_fspace_str_ok
  1205 00007909 28D2                <1> 	sub	dl, dl ; 0
  1206 0000790B EBF0                <1> 	jmp	short loc_write_vol_fspace_chr
  1207                              <1> 
  1208                              <1> loc_write_vol_fspace_str_ok:
  1209 0000790D 893D[D3600100]      <1> 	mov	[Vol_Free_Sectors_Str_Start], edi
  1210                              <1> 	;
  1211 00007913 BE[F00E0100]        <1> 	mov	esi, Volume_in_drive
  1212 00007918 E8B0EAFFFF          <1> 	call	print_msg
  1213 0000791D BE[300F0100]        <1> 	mov	esi, Vol_Name
  1214 00007922 E8A6EAFFFF          <1> 	call	print_msg
  1215 00007927 BE[FF190100]        <1> 	mov	esi, nextline
  1216 0000792C E89CEAFFFF          <1> 	call	print_msg
  1217                              <1> 	;
  1218 00007931 BE[910F0100]        <1> 	mov	esi, Vol_Total_Sector_Header
  1219 00007936 E892EAFFFF          <1> 	call	print_msg
  1220 0000793B 8B35[C3600100]      <1> 	mov	esi, [Vol_Tot_Sec_Str_Start]
  1221 00007941 E887EAFFFF          <1> 	call	print_msg
  1222 00007946 8B35[BB600100]      <1> 	mov	esi, [VolSize_Unit1]
  1223 0000794C E87CEAFFFF          <1> 	call	print_msg
  1224                              <1> 	;
  1225 00007951 BE[A20F0100]        <1> 	mov	esi, Vol_Free_Sectors_Header
  1226 00007956 E872EAFFFF          <1> 	call	print_msg
  1227 0000795B 8B35[D3600100]      <1> 	mov	esi, [Vol_Free_Sectors_Str_Start]
  1228 00007961 E867EAFFFF          <1> 	call	print_msg
  1229 00007966 8B35[BF600100]      <1> 	mov	esi, [VolSize_Unit2]
  1230 0000796C E85CEAFFFF          <1> 	call	print_msg
  1231                              <1> 	;
  1232 00007971 5E                  <1> 	pop	esi
  1233                              <1> 	
  1234                              <1> 	;mov	ah, [esi+LD_FSType]
  1235                              <1> 	;mov	al, [esi+LD_FATType]
  1236 00007972 668B4603            <1> 	mov	ax, [esi+LD_FATType]
  1237                              <1> 
  1238 00007976 C3                  <1> 	retn
  1239                              <1> 
  1240                              <1> move_volume_name_and_serial_no:
  1241                              <1> 	; 08/02/2016  (TRDOS 386 = TRDOS v2.0)
  1242                              <1> 	; this routine will be called by
  1243                              <1> 	; "print_volume_info" and "print_directory"
  1244                              <1> 	; INPUT ->
  1245                              <1> 	;	ESI = Logical DOS drv descripton table address
  1246                              <1> 	; OUTPUT ->
  1247                              <1> 	;	*Volume name will be moved to text area
  1248                              <1> 	;	*Volume serial number will be converted to
  1249                              <1> 	;	 text and will be moved to text area
  1250                              <1> 	;   cf = 1 -> invalid/unknown dos drive
  1251                              <1> 	;   cf = 0 -> ecx = 0
  1252                              <1> 	;
  1253                              <1> 	; (eax, edx, ecx, esi, edi will be changed)
  1254                              <1> 
  1255 00007977 BF[300F0100]        <1> 	mov 	edi, Vol_Name
  1256                              <1> 
  1257                              <1> 	;mov	ah, [esi+LD_FSType]
  1258                              <1> 	;mov	al, [esi+LD_FATType]
  1259 0000797C 668B4603            <1> 	mov	ax, [esi+LD_FATType]
  1260 00007980 80FCA1              <1> 	cmp	ah, 0A1h
  1261 00007983 7418                <1> 	je	short mvn_2
  1262 00007985 08E4                <1> 	or	ah, ah
  1263 00007987 7404                <1> 	jz	short mvn_0
  1264 00007989 08C0                <1> 	or	al, al
  1265 0000798B 7504                <1> 	jnz	short mvn_1
  1266                              <1> mvn_0:
  1267 0000798D 8A06                <1> 	mov	al, [esi]
  1268 0000798F F9                  <1> 	stc
  1269 00007990 C3                  <1> 	retn
  1270                              <1> mvn_1:
  1271 00007991 3C02                <1> 	cmp	al, 2
  1272 00007993 7717                <1> 	ja	short mvn_3 
  1273                              <1> 	;or	al, al
  1274                              <1> 	;jz	short mvn_2
  1275 00007995 8B462D              <1> 	mov	eax, [esi+LD_BPB+VolumeID]
  1276 00007998 83C631              <1> 	add	esi, LD_BPB+VolumeLabel
  1277 0000799B EB15                <1> 	jmp	short mvn_4
  1278                              <1> mvn_2:
  1279 0000799D 8B4628              <1> 	mov	eax, [esi+LD_FS_VolumeSerial]
  1280 000079A0 83C62C              <1> 	add	esi, LD_FS_VolumeName
  1281 000079A3 B910000000          <1> 	mov	ecx, 16
  1282 000079A8 F3A5                <1> 	rep	movsd
  1283 000079AA EB10                <1> 	jmp	short mvn_5
  1284                              <1> mvn_3:
  1285 000079AC 8B4649              <1> 	mov	eax, [esi+LD_BPB+FAT32_VolID]
  1286 000079AF 83C64D              <1> 	add	esi, LD_BPB+FAT32_VolLab
  1287                              <1> mvn_4:
  1288 000079B2 B90B000000          <1> 	mov	ecx, 11
  1289 000079B7 F3A4                <1> 	rep	movsb
  1290 000079B9 C60700              <1> 	mov	byte [edi], 0
  1291                              <1> mvn_5:
  1292                              <1> 	;mov	[Current_VolSerial], eax  
  1293 000079BC E851B9FFFF          <1> 	call	dwordtohex
  1294 000079C1 8915[850F0100]      <1> 	mov	[Vol_Serial1], edx
  1295 000079C7 A3[8A0F0100]        <1> 	mov	[Vol_Serial2], eax
  1296                              <1> 	; ecx = 0
  1297 000079CC C3                  <1> 	retn
  1298                              <1> 
  1299                              <1> get_volume_serial_number:
  1300                              <1> 	; 19/01/2016 (TRDOS 386 = TRDOS v2.0)
  1301                              <1> 	; 08/08/2010
  1302                              <1> 	;
  1303                              <1> 	; INPUT -> DL = Logical DOS Drive number
  1304                              <1> 	; OUTPUT -> EAX = Volume serial number
  1305                              <1> 	;          BL= FAT Type	    
  1306                              <1> 	;          BH = Logical DOS drv Number (DL input)
  1307                              <1> 	; cf = 1 -> Drive not ready
  1308                              <1> 
  1309 000079CD 31DB                <1> 	xor	ebx, ebx
  1310 000079CF 88D7                <1> 	mov	bh, dl
  1311 000079D1 3815[610D0100]      <1> 	cmp	[Last_DOS_DiskNo], dl
  1312 000079D7 7304                <1> 	jnb	short loc_gvsn_start
  1313                              <1> loc_gvsn_stc_retn:
  1314 000079D9 31C0                <1> 	xor	eax, eax
  1315 000079DB F9                  <1> 	stc 
  1316 000079DC C3                  <1>         retn 
  1317                              <1> loc_gvsn_start:
  1318 000079DD 56                  <1> 	push	esi
  1319 000079DE BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1320 000079E3 01DE                <1> 	add	esi, ebx
  1321 000079E5 8A5E03              <1> 	mov	bl, [esi+LD_FATType]
  1322 000079E8 20DB                <1> 	and	bl, bl
  1323 000079EA 740F                <1> 	jz	short loc_gvsn_fs
  1324 000079EC 80FB02              <1> 	cmp	bl, 2
  1325 000079EF 7705                <1> 	ja	short loc_gvsn_fat32
  1326                              <1> loc_gvsn_fat:
  1327 000079F1 83C62D              <1> 	add	esi, LD_BPB + VolumeID
  1328 000079F4 EB0E                <1> 	jmp	short loc_gvsn_return
  1329                              <1> loc_gvsn_fat32: 
  1330 000079F6 83C649              <1> 	add	esi, LD_BPB + FAT32_VolID
  1331 000079F9 EB09                <1> 	jmp	short loc_gvsn_return 
  1332                              <1> loc_gvsn_fs:
  1333 000079FB 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  1334 000079FF 75D8                <1> 	jne	short loc_gvsn_stc_retn 
  1335 00007A01 83C628              <1> 	add	esi, LD_FS_VolumeSerial
  1336                              <1> loc_gvsn_return:
  1337 00007A04 8B06                <1> 	mov	eax, [esi]
  1338 00007A06 5E                  <1> 	pop	esi
  1339 00007A07 C3                  <1> 	retn
  1340                              <1> 
  1341                              <1> ; CMD_INTR.ASM [ TRDOS Command Interpreter Procedure ]
  1342                              <1> ; 09/11/2011
  1343                              <1> ; 29/01/2005
  1344                              <1> 
  1345                              <1> command_interpreter:
  1346                              <1> 	; 16/10/2016
  1347                              <1> 	; 12/10/2016
  1348                              <1> 	; 13/05/2016
  1349                              <1> 	; 07/05/2016
  1350                              <1> 	; 04/03/2016
  1351                              <1> 	; 04/02/2016
  1352                              <1> 	; 03/02/2016
  1353                              <1> 	; 30/01/2016
  1354                              <1> 	; 29/01/2016 (TRDOS 386 = TRDOS 2.0)
  1355                              <1> 	; 15/09/2011         
  1356                              <1> 	; 29/01/2005
  1357                              <1>         
  1358                              <1> 	; Input: ecx = command word length (CL)
  1359                              <1> 	;	 CommandBuffer = Command string offset
  1360                              <1>  
  1361 00007A08 C605[74610100]00    <1> 	mov	byte [Program_Exit],0
  1362 00007A0F 80F904              <1> 	cmp	cl, 4
  1363 00007A12 0F87B5020000        <1>         ja      c_6
  1364 00007A18 0F8237010000        <1>         jb      c_2
  1365                              <1> c_4:
  1366                              <1> 
  1367                              <1> cmp_cmd_exit:
  1368 00007A1E BF[CF0D0100]        <1> 	mov	edi, Cmd_Exit
  1369 00007A23 E8C2030000          <1> 	call	cmp_cmd	
  1370 00007A28 7208                <1> 	jc	short cmp_cmd_date
  1371                              <1> 
  1372 00007A2A C605[74610100]01    <1>         mov     byte [Program_Exit], 1
  1373 00007A31 C3                  <1>         retn
  1374                              <1> 
  1375                              <1> cmp_cmd_date:
  1376 00007A32 B104                <1> 	mov	cl, 4
  1377 00007A34 BF[EB0D0100]        <1> 	mov	edi, Cmd_Date
  1378 00007A39 E8AC030000          <1> 	call	cmp_cmd	
  1379 00007A3E 720B                <1>         jc	short cmp_cmd_time
  1380                              <1> 	
  1381 00007A40 E8D0F7FFFF          <1> 	call	show_date
  1382 00007A45 E80FF8FFFF          <1> 	call	set_date
  1383 00007A4A C3                  <1> 	retn
  1384                              <1> 
  1385                              <1> cmp_cmd_time:
  1386 00007A4B B104                <1> 	mov	cl, 4
  1387 00007A4D BF[F00D0100]        <1> 	mov	edi, Cmd_Time
  1388 00007A52 E893030000          <1>    	call	cmp_cmd	
  1389 00007A57 720B                <1> 	jc	short cmp_cmd_show
  1390                              <1> 
  1391 00007A59 E8C6FAFFFF          <1> 	call	show_time
  1392 00007A5E E8F8FAFFFF          <1> 	call	set_time
  1393 00007A63 C3                  <1> 	retn
  1394                              <1> 
  1395                              <1> cmp_cmd_show:
  1396 00007A64 B104                <1> 	mov	cl, 4
  1397 00007A66 BF[010E0100]        <1> 	mov	edi, Cmd_Show
  1398 00007A6B E87A030000          <1>    	call	cmp_cmd	
  1399 00007A70 0F83050A0000        <1>         jnc     show_file
  1400                              <1> 
  1401                              <1> cmp_cmd_echo:
  1402 00007A76 B104                <1> 	mov	cl, 4
  1403 00007A78 BF[3D0E0100]        <1> 	mov	edi, Cmd_Echo
  1404 00007A7D E868030000          <1>    	call	cmp_cmd	
  1405 00007A82 7224                <1> 	jc	short cmp_cmd_copy
  1406                              <1> 	
  1407                              <1> 	; 22/11/2017
  1408                              <1> 	; AL = 0
  1409 00007A84 803E20              <1> 	cmp	byte [esi], 20h
  1410 00007A87 7215                <1> 	jb	short cmd_echo_nextline
  1411                              <1> 	; 14/04/2016
  1412 00007A89 56                  <1> 	push	esi
  1413                              <1> cmd_echo_asciiz:
  1414                              <1> 	;inc	esi
  1415                              <1> 	;mov	al, [esi]
  1416                              <1> 	; 22/11/2017
  1417 00007A8A AC                  <1> 	lodsb
  1418 00007A8B 3C20                <1> 	cmp	al, 20h
  1419 00007A8D 73FB                <1> 	jnb	short cmd_echo_asciiz
  1420 00007A8F 4E                  <1> 	dec	esi
  1421 00007A90 C60600              <1> 	mov	byte [esi], 0
  1422 00007A93 5E                  <1> 	pop	esi
  1423 00007A94 89F7                <1> 	mov	edi, esi
  1424 00007A96 E832E9FFFF          <1> 	call	print_msg
  1425 00007A9B C60700              <1> 	mov	byte [edi], 0	
  1426                              <1> cmd_echo_nextline:
  1427 00007A9E BE[481A0100]        <1> 	mov	esi, NextLine
  1428                              <1> 	;call	print_msg   
  1429                              <1> 	;retn
  1430 00007AA3 E925E9FFFF          <1> 	jmp	print_msg
  1431                              <1> 
  1432                              <1> cmp_cmd_copy:
  1433 00007AA8 B104                <1> 	mov	cl, 4
  1434 00007AAA BF[240E0100]        <1> 	mov	edi, Cmd_Copy
  1435 00007AAF E836030000          <1>    	call	cmp_cmd	
  1436 00007AB4 0F83CC170000        <1> 	jnc	copy_file
  1437                              <1> 
  1438                              <1> cmp_cmd_move:
  1439 00007ABA B104                <1> 	mov	cl, 4
  1440 00007ABC BF[290E0100]        <1> 	mov	edi, Cmd_Move
  1441 00007AC1 E824030000          <1>    	call	cmp_cmd	
  1442 00007AC6 0F836E160000        <1> 	jnc	move_file
  1443                              <1> 
  1444                              <1> cmp_cmd_path:
  1445 00007ACC B104                <1> 	mov	cl, 4
  1446 00007ACE BF[2E0E0100]        <1> 	mov	edi, Cmd_Path
  1447 00007AD3 E812030000          <1>    	call	cmp_cmd	
  1448 00007AD8 0F83F0190000        <1> 	jnc	set_get_path
  1449                              <1> 
  1450                              <1> cmp_cmd_beep:
  1451 00007ADE B104                <1> 	mov	cl, 4
  1452 00007AE0 BF[5B0E0100]        <1> 	mov	edi, Cmd_Beep
  1453 00007AE5 E800030000          <1>    	call	cmp_cmd	
  1454 00007AEA 720B                <1> 	jc	short cmp_cmd_find
  1455                              <1> 	; 13/05/2016
  1456 00007AEC 8A3D[EE580100]      <1> 	mov	bh, [ptty] ; [ACTIVE_PAGE]
  1457 00007AF2 E9A4A2FFFF          <1> 	jmp	beeper
  1458                              <1> 
  1459                              <1> cmp_cmd_find:
  1460 00007AF7 B104                <1> 	mov	cl, 4
  1461 00007AF9 BF[380E0100]        <1> 	mov	edi, Cmd_Find
  1462 00007AFE E8E7020000          <1>    	call	cmp_cmd	
  1463 00007B03 0F82C4020000        <1>         jc      cmp_cmd_external
  1464                              <1> 
  1465                              <1> 	;call	find_and_list_files
  1466 00007B09 E9AF220000          <1> 	jmp	find_and_list_files
  1467                              <1> 	;retn
  1468                              <1> 
  1469                              <1> c_1:
  1470 00007B0E AD                  <1> 	lodsd
  1471                              <1> cmp_cmd_help:
  1472 00007B0F 3C3F                <1> 	cmp	al, '?'
  1473 00007B11 751D                <1>         jne     short cmp_cmd_remark
  1474                              <1> 
  1475 00007B13 BE[C10D0100]        <1> 	mov	esi, Command_List
  1476                              <1> cmd_help_next_w:
  1477 00007B18 E8B0E8FFFF          <1> 	call	print_msg
  1478                              <1> 
  1479 00007B1D 803E20              <1> 	cmp	byte [esi], 20h ; 0
  1480 00007B20 7232                <1> 	jb	short cmd_help_retn
  1481                              <1> 	
  1482 00007B22 56                  <1> 	push	esi
  1483 00007B23 BE[FF190100]        <1> 	mov	esi, nextline
  1484 00007B28 E8A0E8FFFF          <1> 	call	print_msg
  1485 00007B2D 5E                  <1> 	pop	esi
  1486 00007B2E EBE8                <1> 	jmp	short cmd_help_next_w	
  1487                              <1> 
  1488                              <1> cmp_cmd_remark:
  1489 00007B30 3C2A                <1> 	cmp	al, '*'
  1490 00007B32 0F8595020000        <1>         jne     cmp_cmd_external
  1491 00007B38 46                  <1> 	inc	esi
  1492 00007B39 BF[E8590100]        <1> 	mov	edi, Remark
  1493 00007B3E 8A06                <1> 	mov	al, [esi]
  1494 00007B40 3C20                <1> 	cmp	al, 20h
  1495 00007B42 7707                <1> 	ja	short cmd_remark_write
  1496 00007B44 89FE                <1> 	mov	esi, edi ; Remark
  1497 00007B46 E982E8FFFF          <1> 	jmp	print_msg
  1498                              <1> 
  1499                              <1> cmd_remark_write:
  1500 00007B4B AA                  <1> 	stosb
  1501 00007B4C AC                  <1> 	lodsb
  1502 00007B4D 3C20                <1> 	cmp	al, 20h
  1503 00007B4F 73FA                <1> 	jnb	short cmd_remark_write
  1504 00007B51 C60700              <1> 	mov	byte [edi], 0
  1505                              <1> 
  1506                              <1> cmd_help_retn:
  1507                              <1> cmd_remark_retn:
  1508                              <1> cd_retn:
  1509 00007B54 C3                  <1> 	retn
  1510                              <1> 
  1511                              <1> c_2:
  1512 00007B55 80F902              <1> 	cmp	cl, 2
  1513 00007B58 0F87AF000000        <1>         ja      c_3
  1514 00007B5E BE[365A0100]        <1> 	mov	esi, CommandBuffer
  1515 00007B63 72A9                <1> 	jb	short c_1
  1516                              <1> 
  1517                              <1> cmp_cmd_cd:
  1518 00007B65 66AD                <1> 	lodsw
  1519 00007B67 663D4344            <1> 	cmp	ax, 'CD'
  1520 00007B6B 7551                <1> 	jne	short cmp_cmd_drive
  1521 00007B6D 46                  <1>         inc	esi
  1522                              <1> cd_0:
  1523 00007B6E 668B06              <1> 	mov	ax, [esi]	
  1524 00007B71 3C20                <1> 	cmp	al, 20h
  1525 00007B73 76DF                <1> 	jna	short cd_retn
  1526                              <1> 	; 10/02/2016
  1527 00007B75 80FC3A              <1> 	cmp	ah, ':'
  1528 00007B78 7504                <1> 	jne	short cd_1
  1529 00007B7A 46                  <1> 	inc	esi
  1530 00007B7B 46                  <1> 	inc	esi
  1531 00007B7C EB49                <1> 	jmp	short cd_2
  1532                              <1> 
  1533                              <1> cd_1:	; change current directory
  1534                              <1> 	; 29/11/2009
  1535                              <1> 	; AH = CDh	; to separate 'CD' command from others
  1536                              <1> 			; for restoring current directory
  1537                              <1> 			; 0CDh sign is for saving cdir into 
  1538                              <1> 			; DOS drv description table cdir area
  1539                              <1> 	
  1540 00007B7E B4CD                <1> 	mov	ah, 0CDh ; mov byte [CD_COMMAND], 0CDh 
  1541                              <1> 
  1542 00007B80 E81D230000          <1> 	call	change_current_directory
  1543 00007B85 0F8337220000        <1>         jnc     change_prompt_dir_string
  1544                              <1> 
  1545                              <1> cd_error_messages:
  1546 00007B8B 3C03                <1> 	cmp	al, 3
  1547 00007B8D 740C                <1> 	je	short cd_path_not_found
  1548                              <1> 	; 16/10/2016 (15h -> 15)
  1549 00007B8F 3C0F                <1> 	cmp	al, 15 ; drive not ready error 
  1550 00007B91 7459                <1> 	je	short cd_drive_not_ready
  1551 00007B93 3C11                <1> 	cmp	al, 17 ; read error
  1552 00007B95 7455                <1> 	je	short cd_drive_not_ready	
  1553 00007B97 3C13                <1> 	cmp	al, 19 ; ; Bad directory/path name 
  1554 00007B99 7466                <1> 	je	short cd_command_failed
  1555                              <1> 
  1556                              <1> cd_path_not_found:
  1557 00007B9B 50                  <1> 	push	eax ; 29/12/2017
  1558                              <1> 	;push	ax	
  1559 00007B9C BE[64100100]        <1> 	mov	esi, Msg_Dir_Not_Found
  1560 00007BA1 E827E8FFFF          <1> 	call	print_msg
  1561                              <1> 	;pop	ax
  1562 00007BA6 58                  <1> 	pop	eax ; 29/12/2017
  1563 00007BA7 3A25[84590100]      <1> 	cmp	ah, [Current_Dir_Level]
  1564 00007BAD 0F830F220000        <1>         jnb     change_prompt_dir_string
  1565 00007BB3 8825[84590100]      <1> 	mov	[Current_Dir_Level], ah
  1566 00007BB9 E904220000          <1>         jmp     change_prompt_dir_string   
  1567                              <1> 
  1568                              <1> cmp_cmd_drive: ; change current drive
  1569                              <1> 	; C:, D:, E: etc.
  1570 00007BBE 80FC3A              <1> 	cmp	ah, ':'
  1571 00007BC1 0F8506020000        <1>         jne     cmp_cmd_external
  1572                              <1> 
  1573                              <1> cd_2:	; 'CD C:', 'CD D:' ...
  1574 00007BC7 803E20              <1> 	cmp	byte [esi], 20h
  1575 00007BCA 0F8707020000        <1>         ja      loc_cmd_failed
  1576                              <1> 
  1577 00007BD0 24DF                <1> 	and	al, 0DFh
  1578 00007BD2 2C41                <1> 	sub	al, 'A'
  1579 00007BD4 0F82FD010000        <1>         jc      loc_cmd_failed
  1580                              <1> 
  1581 00007BDA 3A05[610D0100]      <1>         cmp     al, [Last_DOS_DiskNo]
  1582 00007BE0 770A                <1>         ja	short cd_drive_not_ready
  1583                              <1> 	
  1584 00007BE2 88C2                <1> 	mov	dl, al
  1585 00007BE4 E85BF3FFFF          <1> 	call 	change_current_drive
  1586 00007BE9 7201                <1> 	jc	short cd_drive_not_ready	
  1587 00007BEB C3                  <1> 	retn
  1588                              <1> 
  1589                              <1> cd_drive_not_ready:
  1590 00007BEC BE[21100100]        <1> 	mov	esi, Msg_Not_Ready_Read_Err
  1591 00007BF1 E8D7E7FFFF          <1> 	call	print_msg
  1592                              <1> 
  1593                              <1> cd_fail_drive_restart:
  1594 00007BF6 8A15[86590100]      <1> 	mov	dl, [Current_Drv]
  1595                              <1> 	;call 	change_current_drive
  1596 00007BFC E943F3FFFF          <1>         jmp     change_current_drive
  1597                              <1> 	;retn
  1598                              <1> 
  1599                              <1> cd_command_failed:
  1600 00007C01 BE[02100100]        <1> 	mov	esi, Msg_Bad_Command
  1601 00007C06 E8C2E7FFFF          <1> 	call	print_msg
  1602 00007C0B EBE9                <1> 	jmp	short cd_fail_drive_restart
  1603                              <1> 
  1604                              <1> c_3:
  1605                              <1> cmp_cmd_dir:
  1606 00007C0D BF[C10D0100]        <1> 	mov	edi, Cmd_Dir
  1607 00007C12 E8D3010000          <1> 	call	cmp_cmd	
  1608 00007C17 0F8380020000        <1> 	jnc	print_directory_list
  1609                              <1> 
  1610                              <1> cmp_cmd_cls:
  1611 00007C1D B103                <1> 	mov	cl, 3
  1612 00007C1F BF[FD0D0100]        <1> 	mov	edi, Cmd_Cls
  1613 00007C24 E8C1010000          <1> 	call	cmp_cmd	
  1614 00007C29 0F83B4E7FFFF        <1>         jnc	clear_screen
  1615                              <1> 
  1616                              <1> cmp_cmd_ver:
  1617 00007C2F B103                <1> 	mov	cl, 3
  1618 00007C31 BF[CB0D0100]        <1> 	mov	edi, Cmd_Ver
  1619 00007C36 E8AF010000          <1> 	call	cmp_cmd	
  1620 00007C3B 720A                <1> 	jc	short cmp_cmd_mem
  1621                              <1> 
  1622 00007C3D BE[690D0100]        <1> 	mov	esi, mainprog_Version
  1623                              <1> 	;call	print_msg
  1624 00007C42 E986E7FFFF          <1> 	jmp	print_msg
  1625                              <1> 	;retn
  1626                              <1> 
  1627                              <1> cmp_cmd_mem:
  1628 00007C47 B103                <1> 	mov	cl, 3
  1629 00007C49 BF[330E0100]        <1> 	mov	edi, Cmd_Mem
  1630 00007C4E E897010000          <1> 	call	cmp_cmd	
  1631 00007C53 0F8304B6FFFF        <1> 	jnc	memory_info
  1632                              <1> 
  1633                              <1> cmp_cmd_del:
  1634 00007C59 B103                <1> 	mov	cl, 3
  1635 00007C5B BF[060E0100]        <1> 	mov	edi, Cmd_Del
  1636 00007C60 E885010000          <1> 	call	cmp_cmd	
  1637 00007C65 0F83280F0000        <1>         jnc     delete_file
  1638                              <1> 
  1639                              <1> cmp_cmd_set:
  1640 00007C6B B103                <1> 	mov	cl, 3
  1641 00007C6D BF[F90D0100]        <1> 	mov	edi, Cmd_Set
  1642 00007C72 E873010000          <1> 	call	cmp_cmd	
  1643 00007C77 0F83C9170000        <1>         jnc     set_get_env
  1644                              <1> 
  1645                              <1> cmp_cmd_run:
  1646 00007C7D B103                <1> 	mov	cl, 3
  1647 00007C7F BF[F50D0100]        <1> 	mov	edi, Cmd_Run
  1648 00007C84 E861010000          <1> 	call	cmp_cmd	
  1649                              <1> 	; 07/05/2016
  1650 00007C89 0F823E010000        <1>         jc      cmp_cmd_external
  1651 00007C8F E90F1E0000          <1> 	jmp	load_and_execute_file
  1652                              <1> c_5:
  1653                              <1> cmp_cmd_mkdir:
  1654 00007C94 BF[1E0E0100]        <1> 	mov	edi, Cmd_Mkdir
  1655 00007C99 E84C010000          <1> 	call	cmp_cmd	
  1656 00007C9E 0F83990A0000        <1>         jnc     make_directory
  1657                              <1> 
  1658                              <1> cmp_cmd_rmdir:
  1659 00007CA4 B105                <1> 	mov	cl, 5
  1660 00007CA6 BF[180E0100]        <1> 	mov	edi, Cmd_Rmdir
  1661 00007CAB E83A010000          <1> 	call	cmp_cmd	
  1662 00007CB0 0F83AA0B0000        <1>         jnc     delete_directory
  1663                              <1> 
  1664                              <1> cmp_cmd_chdir:
  1665 00007CB6 B105                <1> 	mov	cl, 5
  1666 00007CB8 BF[550E0100]        <1> 	mov	edi, Cmd_Chdir
  1667 00007CBD E828010000          <1> 	call	cmp_cmd	
  1668 00007CC2 0F8205010000        <1>         jc      cmp_cmd_external
  1669                              <1> 
  1670 00007CC8 E9A1FEFFFF          <1> 	jmp	cd_0
  1671                              <1> 
  1672                              <1> c_6:
  1673 00007CCD 80F906              <1> 	cmp	cl, 6
  1674 00007CD0 0F87E0000000        <1>         ja      c_8
  1675 00007CD6 72BC                <1> 	jb	short c_5
  1676                              <1> cmp_cmd_prompt:
  1677 00007CD8 BF[D40D0100]        <1> 	mov	edi, Cmd_Prompt
  1678 00007CDD E808010000          <1> 	call	cmp_cmd	
  1679 00007CE2 722F                <1>         jc	short cmp_cmd_volume
  1680                              <1> get_prompt_name_fchar:
  1681 00007CE4 AC                  <1> 	lodsb
  1682 00007CE5 3C20                <1> 	cmp	al, 20h
  1683 00007CE7 74FB                <1> 	je	short get_prompt_name_fchar
  1684 00007CE9 7713                <1> 	ja	short loc_change_prompt_label
  1685                              <1> default_command_prompt: ; 31/12/2017 ('sysprompt')
  1686 00007CEB BE[B50D0100]        <1> 	mov	esi, TRDOSPromptLabel
  1687 00007CF0 C7065452444F        <1> 	mov	dword [esi], "TRDO"
  1688 00007CF6 66C746045300        <1>        	mov	word [esi+4], "S" 
  1689                              <1> loc_cmd_prompt_return:
  1690 00007CFC C3                  <1> 	retn
  1691                              <1> 
  1692                              <1> set_command_prompt: ; 31/12/2017 ('sysprompt')
  1693 00007CFD AC                  <1> 	lodsb
  1694                              <1> loc_change_prompt_label:
  1695 00007CFE 66B90B00            <1> 	mov	cx, 11
  1696 00007D02 BF[B50D0100]        <1> 	mov	edi, TRDOSPromptLabel
  1697                              <1> put_char_new_prompt_label:
  1698 00007D07 AA                  <1> 	stosb
  1699 00007D08 AC                  <1> 	lodsb
  1700 00007D09 3C20                <1> 	cmp	al, 20h
  1701 00007D0B 7202                <1> 	jb	short pass_put_new_prompt_label
  1702 00007D0D E2F8                <1> 	loop	put_char_new_prompt_label
  1703                              <1> pass_put_new_prompt_label:
  1704 00007D0F C60700              <1> 	mov	byte [edi], 0
  1705 00007D12 C3                  <1> 	retn
  1706                              <1> 
  1707                              <1> cmp_cmd_volume:
  1708 00007D13 B106                <1> 	mov	cl, 6
  1709 00007D15 BF[DB0D0100]        <1> 	mov	edi, Cmd_Volume
  1710 00007D1A E8CB000000          <1> 	call	cmp_cmd	
  1711 00007D1F 7255                <1>         jc	short cmp_cmd_attrib
  1712                              <1> 
  1713                              <1> cmd_vol1:
  1714 00007D21 AC                  <1> 	lodsb
  1715 00007D22 3C20                <1> 	cmp	al, 20h
  1716 00007D24 7707                <1> 	ja	short cmd_vol2
  1717 00007D26 A0[86590100]        <1> 	mov	al, [Current_Drv]
  1718 00007D2B EB3D                <1> 	jmp	short cmd_vol4
  1719                              <1> cmd_vol2:
  1720 00007D2D 3C41                <1> 	cmp	al, 'A'
  1721 00007D2F 0F82A2000000        <1>         jb      loc_cmd_failed
  1722 00007D35 3C7A                <1> 	cmp	al, 'z'
  1723 00007D37 0F879A000000        <1>         ja      loc_cmd_failed
  1724 00007D3D 3C5A                <1> 	cmp	al, 'Z'
  1725 00007D3F 760A                <1> 	jna	short cmd_vol3
  1726 00007D41 3C61                <1> 	cmp	al, 'a'
  1727 00007D43 0F828E000000        <1>         jb      loc_cmd_failed
  1728 00007D49 24DF                <1> 	and	al, 0DFh
  1729                              <1> cmd_vol3:
  1730 00007D4B 8A26                <1> 	mov	ah, [esi]
  1731 00007D4D 80FC3A              <1> 	cmp	ah, ':'
  1732 00007D50 0F8581000000        <1>         jne     loc_cmd_failed
  1733 00007D56 2C41                <1> 	sub	al, 'A'
  1734 00007D58 3A05[610D0100]      <1>         cmp     al, [Last_DOS_DiskNo]
  1735 00007D5E 760A                <1> 	jna	short cmd_vol4
  1736                              <1> 
  1737 00007D60 BE[21100100]        <1> 	mov	esi, Msg_Not_Ready_Read_Err
  1738 00007D65 E963E6FFFF          <1> 	jmp	print_msg
  1739                              <1> 	
  1740                              <1> cmd_vol4:
  1741 00007D6A E88EFAFFFF          <1> 	call	print_volume_info
  1742 00007D6F 0F8277FEFFFF        <1>         jc      cd_drive_not_ready
  1743 00007D75 C3                  <1> 	retn
  1744                              <1> 
  1745                              <1> cmp_cmd_attrib:
  1746 00007D76 B106                <1> 	mov	cl, 6
  1747 00007D78 BF[0A0E0100]        <1> 	mov	edi, Cmd_Attrib
  1748 00007D7D E868000000          <1> 	call	cmp_cmd	
  1749 00007D82 0F831D0F0000        <1>         jnc     set_file_attributes
  1750                              <1> 
  1751                              <1> cmp_cmd_rename:
  1752 00007D88 B106                <1> 	mov	cl, 6
  1753 00007D8A BF[110E0100]        <1> 	mov	edi, Cmd_Rename
  1754 00007D8F E856000000          <1> 	call	cmp_cmd	
  1755 00007D94 0F8353110000        <1>         jnc     rename_file
  1756                              <1> 
  1757                              <1> cmp_cmd_device:
  1758 00007D9A B106                <1> 	mov	cl, 6
  1759 00007D9C BF[460E0100]        <1> 	mov	edi, Cmd_Device
  1760 00007DA1 E844000000          <1> 	call	cmp_cmd	
  1761 00007DA6 7225                <1>         jc	short cmp_cmd_external
  1762                              <1> 
  1763 00007DA8 C3                  <1> 	retn
  1764                              <1> 
  1765                              <1> c_7:
  1766                              <1> cmp_cmd_devlist:
  1767 00007DA9 BF[4D0E0100]        <1> 	mov	edi, Cmd_DevList
  1768 00007DAE E837000000          <1> 	call	cmp_cmd	
  1769 00007DB3 7218                <1>         jc	short cmp_cmd_external
  1770                              <1> 
  1771                              <1> loc_cmd_return:
  1772 00007DB5 C3                  <1> 	retn
  1773                              <1> 
  1774                              <1> c_8:
  1775 00007DB6 80F908              <1>         cmp	cl, 8
  1776 00007DB9 7712                <1> 	ja	short cmp_cmd_external
  1777 00007DBB 72EC                <1> 	jb	short c_7
  1778                              <1> 
  1779                              <1> cmp_cmd_longname:
  1780 00007DBD BF[E20D0100]        <1> 	mov	edi, Cmd_LongName
  1781 00007DC2 E823000000          <1> 	call	cmp_cmd	
  1782 00007DC7 0F8350060000        <1>         jnc     get_and_print_longname
  1783                              <1> 
  1784                              <1> cmp_cmd_external:
  1785                              <1> 	; 07/05/2016
  1786                              <1> 	; 22/04/2016
  1787 00007DCD BE[365A0100]        <1> 	mov	esi, CommandBuffer
  1788 00007DD2 E9CC1C0000          <1> 	jmp	loc_run_check_filename 
  1789                              <1> 
  1790                              <1> loc_cmd_failed:
  1791 00007DD7 803D[365A0100]20    <1> 	cmp	byte [CommandBuffer], 20h
  1792 00007DDE 76D5                <1> 	jna	short loc_cmd_return
  1793 00007DE0 BE[02100100]        <1> 	mov	esi, Msg_Bad_Command
  1794                              <1> ;	call	print_msg
  1795                              <1> ;loc_cmd_return:
  1796                              <1> ;	retn
  1797 00007DE5 E9E3E5FFFF          <1> 	jmp	print_msg
  1798                              <1> 
  1799                              <1> cmp_cmd:
  1800                              <1> 	 ; 29/01/2016 (TRDOS 386 = TRDOS v2.0)
  1801 00007DEA BE[365A0100]        <1>          mov	esi, CommandBuffer
  1802                              <1>          ; edi = internal command word (ASCIIZ)
  1803                              <1> 	 ; ecx = command length (<=8)
  1804                              <1> cmp_cmd_1:
  1805 00007DEF AC                  <1> 	lodsb
  1806 00007DF0 AE                  <1> 	scasb
  1807 00007DF1 750D                <1> 	jne	short cmp_cmd_3
  1808 00007DF3 E2FA                <1> 	loop	cmp_cmd_1
  1809 00007DF5 AC                  <1>  	lodsb
  1810 00007DF6 3C20                <1> 	cmp	al, 20h
  1811 00007DF8 7703                <1> 	ja	short cmp_cmd_2
  1812 00007DFA 30C0                <1> 	xor	al, al
  1813                              <1> 	; ZF = 1 -> internal command word matches
  1814 00007DFC C3                  <1> 	retn
  1815                              <1> cmp_cmd_2:
  1816                              <1> 	; ZF = 0 (CF = 0) -> external command word 	
  1817 00007DFD 58                  <1> 	pop	eax ; no return to the caller from here 
  1818 00007DFE EBCD                <1> 	jmp	cmp_cmd_external	
  1819                              <1> cmp_cmd_3:
  1820 00007E00 F9                  <1> 	stc
  1821                              <1> 	; CF = 1 -> internal command word does not match
  1822 00007E01 C3                  <1> 	retn
  1823                              <1> 
  1824                              <1> loc_run_cmd_failed:
  1825                              <1> 	; 15/03/2016
  1826                              <1> 	; 15/02/2016 (TRDOS 386 = TRDOS v2.0)
  1827                              <1> 	; 07/12/2009 (CMD_INTR.ASM)	
  1828                              <1> 	; 29/11/2009
  1829                              <1> 
  1830 00007E02 E863000000          <1> 	call	restore_cdir_after_cmd_fail
  1831                              <1> 
  1832                              <1> loc_run_cmd_failed_cmp_al:
  1833                              <1> 	; End of Restore_CDIR code (29/11/2009)
  1834                              <1> 
  1835 00007E07 3C01                <1> 	cmp	al, 1 ; Bad command or file name
  1836 00007E09 74CC                <1> 	je	loc_cmd_failed
  1837                              <1> loc_run_dir_not_found:
  1838 00007E0B 3C03                <1> 	cmp	al, 3
  1839 00007E0D 750A                <1> 	jne	short loc_run_file_notfound_msg
  1840                              <1> 	; Path not found (MS-DOS Error Code = 3)
  1841 00007E0F BE[64100100]        <1> 	mov	esi, Msg_Dir_Not_Found
  1842 00007E14 E9B4E5FFFF          <1> 	jmp	print_msg
  1843                              <1> 
  1844                              <1> loc_run_file_notfound_msg:
  1845 00007E19 3C02                <1> 	cmp	al, 2 ; File not found
  1846 00007E1B 750A                <1> 	jne	short loc_run_file_drv_read_err
  1847                              <1> 
  1848                              <1> loc_print_file_notfound_msg: 
  1849 00007E1D BE[7B100100]        <1>         mov     esi, Msg_File_Not_Found
  1850                              <1> 	;call	proc_printmsg
  1851                              <1> 	;retn
  1852 00007E22 E9A6E5FFFF          <1> 	jmp	print_msg
  1853                              <1> 
  1854                              <1> loc_run_file_drv_read_err:
  1855                              <1> 	; Err: 17 (Read fault)
  1856 00007E27 3C11                <1> 	cmp	al, 17 ; Drive not ready or read error
  1857 00007E29 7404                <1> 	je	short loc_run_file_print_drv_read_err
  1858                              <1> 	;
  1859 00007E2B 3C0F                <1> 	cmp	al, 15 ; Drive not ready (or read error)
  1860 00007E2D 750A                <1> 	jne	short loc_run_file_toobig
  1861                              <1> 
  1862                              <1> loc_run_file_print_drv_read_err:
  1863 00007E2F BE[21100100]        <1> 	mov	esi, Msg_Not_Ready_Read_Err
  1864 00007E34 E994E5FFFF          <1> 	jmp	print_msg
  1865                              <1> 
  1866                              <1> loc_run_file_toobig:
  1867 00007E39 3C08                <1> 	cmp	al, 8 ; Not enough free memory to load&run file
  1868 00007E3B 750A                <1> 	jne	short loc_run_file_perm_denied
  1869 00007E3D BE[C6100100]        <1> 	mov	esi, Msg_Insufficient_Memory
  1870 00007E42 E986E5FFFF          <1> 	jmp	print_msg
  1871                              <1> 
  1872                              <1> loc_run_file_perm_denied:
  1873                              <1> 	; 29/12/2017
  1874 00007E47 3C0B                <1> 	cmp	al, ERR_PERM_DENIED ; 11 ; Permission denied
  1875 00007E49 750A                <1> 	jne	short loc_run_misc_error
  1876 00007E4B BE[5A120100]        <1> 	mov	esi, Msg_Permission_Denied
  1877 00007E50 E978E5FFFF          <1> 	jmp	print_msg	
  1878                              <1> 
  1879                              <1> 	; 15/03/2016
  1880                              <1> print_misc_error_msg:
  1881                              <1> loc_run_misc_error:
  1882                              <1> 	; AL = Error code
  1883 00007E55 E878B4FFFF          <1> 	call	bytetohex
  1884 00007E5A 66A3[FA100100]      <1>         mov     [error_code_hex], ax
  1885                              <1> 	
  1886 00007E60 BE[DD100100]        <1> 	mov	esi, Msg_Error_Code 
  1887                              <1> 	;call	print_msg 
  1888                              <1> 	;retn
  1889                              <1> 
  1890 00007E65 E963E5FFFF          <1> 	jmp	print_msg
  1891                              <1> 
  1892                              <1> restore_cdir_after_cmd_fail:
  1893                              <1> 	; 15/02/2016 (TRDOS 386 = TRDOS v2.0)
  1894 00007E6A 50                  <1> 	push	eax
  1895 00007E6B 8A3D[E2600100]      <1> 	mov	bh, [RUN_CDRV] ; it is set at the beginning
  1896                              <1> 				; of the 'run' command.
  1897 00007E71 3A3D[86590100]      <1> 	cmp	bh, [Current_Drv]
  1898 00007E77 7409                <1> 	je	short loc_run_restore_cdir
  1899 00007E79 88FA                <1> 	mov	dl, bh
  1900 00007E7B E8C4F0FFFF          <1> 	call	change_current_drive 
  1901 00007E80 EB19                <1> 	jmp	short loc_run_err_pass_restore_cdir
  1902                              <1> 
  1903                              <1> loc_run_restore_cdir:
  1904 00007E82 803D[620D0100]00    <1> 	cmp	byte [Restore_CDIR], 0
  1905 00007E89 7610                <1> 	jna	short loc_run_err_pass_restore_cdir
  1906 00007E8B 30DB                <1> 	xor	bl, bl
  1907 00007E8D 0FB7F3              <1> 	movzx	esi, bx
  1908 00007E90 81C600010900        <1> 	add	esi, Logical_DOSDisks
  1909 00007E96 E860F1FFFF          <1> 	call	restore_current_directory
  1910                              <1> 
  1911                              <1> loc_run_err_pass_restore_cdir:
  1912 00007E9B 58                  <1> 	pop	eax
  1913 00007E9C C3                  <1> 	retn
  1914                              <1> 
  1915                              <1> print_directory_list:
  1916                              <1> 	; 10/02/2016
  1917                              <1> 	; 08/02/2016 (TRDOS 386 = TRDOS v2.0)
  1918                              <1> 	; 06/12/2009 ('cmp_cmd_dir')	
  1919                              <1> 	;
  1920 00007E9D 66C705[24620100]00- <1> 	mov	word [AttributesMask], 0800h ; ..except volume names..
  1920 00007EA5 08                  <1>
  1921 00007EA6 A0[86590100]        <1> 	mov	al, [Current_Drv]
  1922 00007EAB A2[E2600100]        <1> 	mov	[RUN_CDRV], al
  1923                              <1> get_dfname_fchar:
  1924 00007EB0 AC                  <1> 	lodsb
  1925 00007EB1 3C20                <1> 	cmp	al, 20h
  1926 00007EB3 74FB                <1> 	je	short get_dfname_fchar
  1927 00007EB5 0F82A4000000        <1>         jb      loc_print_dir_call_all
  1928 00007EBB 3C2D                <1> 	cmp	al, '-'
  1929 00007EBD 7542                <1> 	jne	short loc_print_dir_call_flt
  1930                              <1> get_next_attr_char:
  1931 00007EBF AC                  <1> 	lodsb
  1932 00007EC0 3C20                <1> 	cmp	al, 20h
  1933 00007EC2 74FB                <1> 	je	short get_next_attr_char
  1934 00007EC4 0F820DFFFFFF        <1>         jb      loc_cmd_failed
  1935 00007ECA 24DF                <1> 	and	al, 0DFh
  1936 00007ECC 3C44                <1> 	cmp	al, 'D' ; directories only ?
  1937 00007ECE 7512                <1> 	jne	short pass_only_directories
  1938 00007ED0 AC                  <1> 	lodsb
  1939 00007ED1 3C20                <1> 	cmp	al, 20h
  1940 00007ED3 0F87FEFEFFFF        <1>         ja      loc_cmd_failed
  1941 00007ED9 800D[24620100]10    <1> 	or	byte [AttributesMask], 10h ; ..directory..
  1942 00007EE0 EB18                <1> 	jmp	short get_dfname_fchar_attr
  1943                              <1> pass_only_directories:
  1944 00007EE2 3C46                <1> 	cmp	al, 'F'	; files only ?
  1945 00007EE4 0F85B0000000        <1>         jne     check_attr_s
  1946 00007EEA AC                  <1> 	lodsb
  1947 00007EEB 3C20                <1> 	cmp	al, 20h
  1948 00007EED 0F87E4FEFFFF        <1>         ja      loc_cmd_failed
  1949 00007EF3 800D[25620100]10    <1> 	or	byte [AttributesMask+1], 10h ; ..except directories..
  1950                              <1> get_dfname_fchar_attr:
  1951 00007EFA AC                  <1> 	lodsb
  1952 00007EFB 3C20                <1> 	cmp	al, 20h
  1953 00007EFD 74FB                <1> 	je	short get_dfname_fchar_attr
  1954 00007EFF 725E                <1> 	jb	short loc_print_dir_call_all
  1955                              <1> 
  1956                              <1> loc_print_dir_call_flt:
  1957 00007F01 4E                  <1> 	dec	esi
  1958 00007F02 BF[26620100]        <1> 	mov	edi, FindFile_Drv
  1959 00007F07 E8AC250000          <1> 	call	parse_path_name
  1960 00007F0C 7308                <1>  	jnc	short loc_print_dir_change_drv_1
  1961 00007F0E 3C01                <1> 	cmp	al, 1
  1962 00007F10 0F87ECFEFFFF        <1>         ja      loc_run_cmd_failed
  1963                              <1> 
  1964                              <1> loc_print_dir_change_drv_1:
  1965 00007F16 8A15[26620100]      <1> 	mov	dl, [FindFile_Drv]
  1966                              <1> loc_print_dir_change_drv_2:
  1967 00007F1C 3A15[E2600100]      <1> 	cmp	dl, [RUN_CDRV]
  1968 00007F22 740B                <1> 	je	short loc_print_dir_change_directory 
  1969 00007F24 E81BF0FFFF          <1> 	call	change_current_drive
  1970 00007F29 0F82D3FEFFFF        <1>         jc      loc_run_cmd_failed
  1971                              <1> loc_print_dir_change_directory:
  1972 00007F2F 803D[27620100]20    <1> 	cmp	byte [FindFile_Directory], 20h ; 0 or 20h ?
  1973 00007F36 761D                <1> 	jna	short pass_print_dir_change_directory
  1974                              <1> 
  1975 00007F38 FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  1976 00007F3E BE[27620100]        <1> 	mov	esi, FindFile_Directory
  1977 00007F43 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  1978 00007F45 E8581F0000          <1> 	call	change_current_directory
  1979 00007F4A 0F82B2FEFFFF        <1>         jc      loc_run_cmd_failed
  1980                              <1> 
  1981                              <1> loc_print_dir_change_prompt_dir_string:
  1982 00007F50 E86D1E0000          <1> 	call	change_prompt_dir_string
  1983                              <1> 
  1984                              <1> pass_print_dir_change_directory:
  1985 00007F55 BE[68620100]        <1> 	mov	esi, FindFile_Name
  1986 00007F5A 803E20              <1> 	cmp	byte [esi], 20h ; ; 0 or 20h ?
  1987 00007F5D 7706                <1> 	ja	short loc_print_dir_call
  1988                              <1> 
  1989                              <1> loc_print_dir_call_all:
  1990 00007F5F C7062A2E2A00        <1> 	mov	dword [esi], '*.*'
  1991                              <1> loc_print_dir_call:
  1992 00007F65 E87E000000          <1> 	call	print_directory
  1993                              <1> 
  1994 00007F6A 8A15[E2600100]      <1> 	mov	dl, [RUN_CDRV]  ; it is set at the beginning
  1995 00007F70 3A15[86590100]      <1> 	cmp	dl, [Current_Drv]
  1996 00007F76 7406                <1> 	je	short loc_print_dir_call_restore_cdir_retn
  1997 00007F78 E8C7EFFFFF          <1> 	call	change_current_drive 
  1998 00007F7D C3                  <1> 	retn
  1999                              <1> 
  2000                              <1> loc_print_dir_call_restore_cdir_retn:
  2001 00007F7E 803D[620D0100]00    <1> 	cmp	byte [Restore_CDIR], 0
  2002 00007F85 7610                <1> 	jna	short pass_print_dir_call_restore_cdir_retn
  2003                              <1> 
  2004 00007F87 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2005 00007F8C 31C0                <1> 	xor	eax, eax
  2006 00007F8E 88D4                <1> 	mov	ah, dl
  2007 00007F90 01C6                <1> 	add	esi, eax
  2008                              <1> 
  2009 00007F92 E864F0FFFF          <1> 	call	restore_current_directory
  2010                              <1> 
  2011                              <1> pass_print_dir_call_restore_cdir_retn:
  2012 00007F97 C3                  <1> 	retn
  2013                              <1> 
  2014                              <1> check_attr_s_cap:
  2015 00007F98 24DF                <1> 	and	al, 0DFh
  2016                              <1> check_attr_s:
  2017 00007F9A 3C53                <1> 	cmp	al, 'S'
  2018 00007F9C 7514                <1> 	jne	short pass_attr_s
  2019 00007F9E 800D[24620100]04    <1> 	or	byte [AttributesMask], 4 ; system
  2020 00007FA5 AC                  <1> 	lodsb
  2021 00007FA6 3C20                <1> 	cmp	al, 20h
  2022 00007FA8 0F844CFFFFFF        <1>         je      get_dfname_fchar_attr
  2023 00007FAE 72AF                <1> 	jb	short loc_print_dir_call_all
  2024 00007FB0 24DF                <1> 	and	al, 0DFh
  2025                              <1> pass_attr_s:
  2026 00007FB2 3C48                <1> 	cmp	al, 'H'
  2027 00007FB4 7514                <1> 	jne	short pass_attr_h
  2028 00007FB6 800D[24620100]02    <1> 	or	byte [AttributesMask], 2 ; hidden
  2029                              <1> pass_attr_shr:
  2030 00007FBD AC                  <1> 	lodsb
  2031 00007FBE 3C20                <1> 	cmp	al, 20h
  2032 00007FC0 0F8434FFFFFF        <1>         je      get_dfname_fchar_attr
  2033 00007FC6 7297                <1> 	jb	short loc_print_dir_call_all
  2034 00007FC8 EBCE                <1> 	jmp	short check_attr_s_cap
  2035                              <1> 
  2036                              <1> pass_attr_h:
  2037 00007FCA 3C52                <1> 	cmp	al, 'R'
  2038 00007FCC 7509                <1> 	jne	short pass_attr_r
  2039 00007FCE 800D[24620100]01    <1> 	or	byte [AttributesMask], 1 ; read only
  2040 00007FD5 EBE6                <1> 	jmp	short pass_attr_shr
  2041                              <1> 
  2042                              <1> pass_attr_r:
  2043 00007FD7 3C41                <1> 	cmp	al, 'A'
  2044 00007FD9 0F85F8FDFFFF        <1>         jne     loc_cmd_failed
  2045 00007FDF 800D[24620100]20    <1> 	or	byte [AttributesMask], 20h ; archive
  2046 00007FE6 EBD5                <1> 	jmp	short pass_attr_shr
  2047                              <1> 
  2048                              <1> print_directory:
  2049                              <1> 	; 13/05/2016
  2050                              <1> 	; 11/02/2016
  2051                              <1> 	; 10/02/2016
  2052                              <1> 	; 08/02/2016 (TRDOS 386 = TRDOS v2.0)
  2053                              <1> 	; 30/10/2010 ('proc_print_directory')	
  2054                              <1> 	; 19/09/2009
  2055                              <1> 	; 2005 
  2056                              <1> 	; INPUT ->
  2057                              <1> 	;	ESI = Asciiz File/Dir Name Address
  2058                              <1> 
  2059 00007FE8 56                  <1> 	push	esi
  2060                              <1> 
  2061 00007FE9 29C0                <1> 	sub	eax, eax
  2062                              <1> 
  2063 00007FEB 66A3[B0620100]      <1> 	mov	word [Dir_Count], ax ; 0
  2064 00007FF1 66A3[AE620100]      <1> 	mov 	word [File_Count], ax ; 0
  2065 00007FF7 A3[B2620100]        <1> 	mov 	dword [Total_FSize], eax ; 0
  2066                              <1> 
  2067 00007FFC E8E2E3FFFF          <1> 	call    clear_screen
  2068                              <1> 	
  2069 00008001 31C9                <1> 	xor	ecx, ecx	
  2070 00008003 8A2D[86590100]      <1> 	mov     ch, [Current_Drv] ; DirBuff_Drv - 'A'
  2071 00008009 A0[87590100]        <1> 	mov     al, [Current_Dir_Drv] 
  2072 0000800E A2[1F0F0100]        <1> 	mov     [Dir_Drive_Name], al
  2073 00008013 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2074 00008018 01CE                <1> 	add	esi, ecx
  2075                              <1> 
  2076 0000801A E858F9FFFF          <1> 	call	move_volume_name_and_serial_no
  2077 0000801F 730C                <1> 	jnc	short print_dir_strlen_check
  2078                              <1> 
  2079 00008021 5E                  <1> 	pop	esi
  2080 00008022 8A3D[EE580100]      <1> 	mov	bh, [ptty] ; [ACTIVE_PAGE]
  2081                              <1> 	;call	beeper
  2082                              <1> 	;retn
  2083 00008028 E96E9DFFFF          <1> 	jmp	beeper  ; beep ! and return
  2084                              <1> 
  2085                              <1> print_dir_strlen_check:
  2086 0000802D BE[89590100]        <1> 	mov	esi, Current_Dir_Root
  2087 00008032 BF[BC0F0100]        <1> 	mov	edi, Dir_Str_Root
  2088                              <1> 	
  2089                              <1> 	;xor	ecx, ecx
  2090 00008037 8A0D[E5590100]      <1>         mov     cl, [Current_Dir_StrLen]
  2091 0000803D FEC1                <1> 	inc	cl
  2092 0000803F 80F940              <1> 	cmp	cl, 64
  2093 00008042 760D                <1> 	jna	short pass_print_dir_strlen_shorting
  2094 00008044 46                  <1> 	inc	esi
  2095 00008045 01CE                <1> 	add	esi, ecx
  2096 00008047 83EE40              <1> 	sub	esi, 64 
  2097 0000804A 47                  <1> 	inc	edi
  2098 0000804B B82E2E2E20          <1> 	mov	eax, '... ' 
  2099 00008050 AB                  <1> 	stosd
  2100                              <1>  
  2101                              <1> pass_print_dir_strlen_shorting:
  2102 00008051 F3A4                <1> 	rep	movsb
  2103                              <1> 
  2104 00008053 BE[120F0100]        <1> 	mov	esi, Dir_Drive_Str
  2105 00008058 E870E3FFFF          <1> 	call	print_msg
  2106                              <1> 
  2107 0000805D BE[710F0100]        <1> 	mov	esi, Vol_Serial_Header
  2108 00008062 E866E3FFFF          <1> 	call	print_msg
  2109                              <1> 
  2110 00008067 BE[B10F0100]        <1> 	mov	esi, Dir_Str_Header
  2111 0000806C E85CE3FFFF          <1> 	call	print_msg
  2112                              <1> 	
  2113 00008071 BE[FD190100]        <1> 	mov	esi, next2line
  2114 00008076 E852E3FFFF          <1> 	call	print_msg
  2115                              <1> 
  2116                              <1> loc_print_dir_first_file:
  2117 0000807B C605[C5620100]10    <1> 	mov	byte [PrintDir_RowCounter], 16
  2118 00008082 66A1[24620100]      <1> 	mov	ax, [AttributesMask]
  2119 00008088 5E                  <1> 	pop	esi
  2120                              <1> 
  2121 00008089 E859020000          <1> 	call	find_first_file
  2122 0000808E 0F826F010000        <1>         jc      loc_dir_ok
  2123                              <1> 	 
  2124                              <1> loc_dfname_use_this:
  2125                              <1> 	; bl =	File Attributes (bh = Long Name Entry Length)
  2126 00008094 F6C310              <1> 	test	bl, 10h  ; Is it a directory?
  2127 00008097 741B                <1> 	jz	short loc_not_dir
  2128                              <1> 
  2129 00008099 66FF05[B0620100]    <1> 	inc	word [Dir_Count]
  2130 000080A0 89F2                <1> 	mov	edx, esi 	; FindFile_DirEntry address
  2131 000080A2 BE[00110100]        <1>  	mov	esi, Type_Dir	; '<DIR>     '
  2132 000080A7 BF[17110100]        <1> 	mov	edi, Dir_Or_FileSize
  2133                              <1> 	; move 10 bytes
  2134 000080AC A5                  <1> 	movsd
  2135 000080AD A5                  <1> 	movsd
  2136 000080AE 66A5                <1> 	movsw	    	
  2137 000080B0 89D6                <1> 	mov	esi, edx
  2138 000080B2 EB36                <1> 	jmp     short loc_dir_attribute
  2139                              <1> 
  2140                              <1> loc_not_dir:
  2141 000080B4 66FF05[AE620100]    <1> 	inc	word [File_Count]
  2142 000080BB 0105[B2620100]      <1> 	add	[Total_FSize], eax
  2143                              <1> 
  2144 000080C1 B90A000000          <1> 	mov	ecx, 10  ; 32 bit divisor
  2145 000080C6 89CF                <1> 	mov	edi, ecx
  2146 000080C8 81C7[17110100]      <1> 	add	edi, Dir_Or_FileSize
  2147                              <1> loc_dir_rdivide:
  2148 000080CE 29D2                <1> 	sub	edx, edx
  2149 000080D0 F7F1                <1> 	div	ecx 	 ; remainder in dl (< 10)
  2150 000080D2 80C230              <1> 	add     dl, '0'	 ; to make visible (ascii)
  2151 000080D5 4F                  <1> 	dec	edi
  2152 000080D6 8817                <1> 	mov     [edi], dl
  2153 000080D8 21C0                <1> 	and	eax, eax
  2154 000080DA 75F2                <1> 	jnz	short loc_dir_rdivide
  2155                              <1> 
  2156                              <1> loc_dir_fill_space:
  2157 000080DC 81FF[17110100]      <1> 	cmp     edi, Dir_Or_FileSize
  2158 000080E2 7606                <1> 	jna     short loc_dir_attribute
  2159 000080E4 4F                  <1> 	dec     edi
  2160 000080E5 C60720              <1> 	mov     byte [edi], 20h
  2161 000080E8 EBF2                <1> 	jmp     short loc_dir_fill_space
  2162                              <1> 
  2163                              <1> loc_dir_attribute:
  2164 000080EA C705[22110100]2020- <1> 	mov	dword [File_Attribute], 20202020h
  2164 000080F2 2020                <1>
  2165                              <1> 
  2166 000080F4 80FB20              <1> 	cmp	bl, 20h  ; Is it an archive file?
  2167 000080F7 7207                <1> 	jb	short loc_dir_pass_arch
  2168 000080F9 C605[25110100]41    <1> 	mov	byte [File_Attribute+3], 'A'
  2169                              <1> 
  2170                              <1> loc_dir_pass_arch:
  2171 00008100 80E307              <1> 	and	bl, 7
  2172 00008103 7428                <1> 	jz	short loc_dir_file_name
  2173 00008105 88DF                <1> 	mov	bh, bl
  2174 00008107 80E303              <1> 	and	bl, 3
  2175 0000810A 38DF                <1> 	cmp	bh, bl
  2176 0000810C 7607                <1> 	jna	short loc_dir_pass_s
  2177 0000810E C605[22110100]53    <1> 	mov	byte [File_Attribute], 'S'
  2178                              <1> 
  2179                              <1> loc_dir_pass_s:
  2180 00008115 80E302              <1> 	and     bl,2
  2181 00008118 7407                <1> 	jz      short loc_dir_pass_h
  2182 0000811A C605[23110100]48    <1> 	mov     byte [File_Attribute+1], 'H'
  2183                              <1> loc_dir_pass_h:
  2184 00008121 80E701              <1> 	and     bh,1
  2185 00008124 7407                <1> 	jz      short loc_dir_file_name
  2186 00008126 C605[24110100]52    <1> 	mov     byte [File_Attribute+2], 'R'
  2187                              <1> loc_dir_file_name:
  2188                              <1> 	;mov     bx, [esi+18h] ; Date
  2189                              <1> 	;mov     dx, [esi+16h] ; Time
  2190 0000812D 8B5E16              <1> 	mov	ebx, [esi+16h]
  2191 00008130 89F1                <1> 	mov	ecx, esi ; FindFile_DirEntry address
  2192 00008132 BF[0A110100]        <1> 	mov     edi, File_Name
  2193                              <1> 	; move 8 bytes
  2194 00008137 A5                  <1> 	movsd
  2195 00008138 A5                  <1> 	movsd
  2196 00008139 C60720              <1> 	mov	byte [edi], 20h
  2197 0000813C 47                  <1> 	inc	edi
  2198                              <1> 	; move 3 bytes
  2199 0000813D 66A5                <1> 	movsw
  2200 0000813F A4                  <1> 	movsb
  2201 00008140 89CE                <1> 	mov	esi, ecx
  2202                              <1> 
  2203                              <1> Dir_Time_start:
  2204                              <1> 	;mov	ax, dx		; Time
  2205 00008142 6689D8              <1> 	mov	ax, bx
  2206 00008145 66C1E805            <1> 	shr	ax, 5		; shift right 5 times
  2207 00008149 6683E03F            <1> 	and	ax, 0000111111b	; Minute Mask
  2208 0000814D D40A                <1> 	aam			; Q([AL]/10)->AH
  2209                              <1> 				; R([AL]/10)->AL
  2210                              <1> 				; [AL]+[AH]= Minute as BCD
  2211 0000814F 660D3030            <1> 	or	ax, '00'	; Convert to ASCII
  2212 00008153 86E0                <1> 	xchg	ah, al
  2213 00008155 66A3[35110100]      <1> 	mov	[File_Minute], ax
  2214                              <1> 
  2215                              <1> 	;mov	al, dh
  2216 0000815B 88F8                <1> 	mov	al, bh
  2217 0000815D C0E803              <1> 	shr	al, 3		; shift right 3 times
  2218 00008160 D40A                <1> 	aam			; [AL]+[AH]= Hours as BCD
  2219 00008162 660D3030            <1> 	or	ax, '00'
  2220 00008166 86E0                <1> 	xchg	ah, al
  2221 00008168 66A3[32110100]      <1> 	mov     [File_Hour], ax
  2222                              <1> 
  2223 0000816E C1EB10              <1> 	shr	ebx, 16		; BX = Date
  2224                              <1> 	
  2225                              <1> Dir_Date_start:
  2226 00008171 6689D8              <1> 	mov	ax, bx		; Date
  2227 00008174 6683E01F            <1> 	and	ax, 00011111b	; Day Mask
  2228 00008178 D40A                <1> 	aam			; Q([AL]/10)->AH
  2229                              <1> 				; R([AL]/10)->AL
  2230                              <1> 				; [AL]+[AH]= Day as BCD
  2231 0000817A 660D3030            <1> 	or	ax, '00'	; Convert to ASCII
  2232 0000817E 86C4                <1> 	xchg	al, ah
  2233                              <1> 
  2234 00008180 66A3[27110100]      <1> 	mov	[File_Day], ax
  2235                              <1> 
  2236 00008186 6689D8              <1> 	mov	ax, bx
  2237 00008189 66C1E805            <1> 	shr	ax, 5		; shift right 5 times
  2238 0000818D 6683E00F            <1> 	and	ax, 00001111b	; Month Mask
  2239 00008191 D40A                <1> 	aam
  2240 00008193 660D3030            <1> 	or	ax, '00'
  2241 00008197 86E0                <1> 	xchg	ah, al
  2242 00008199 66A3[2A110100]      <1> 	mov	[File_Month], ax
  2243                              <1> 
  2244 0000819F 6689D8              <1> 	mov	ax, bx
  2245 000081A2 66C1E809            <1> 	shr     ax, 9
  2246 000081A6 6683E07F            <1> 	and	ax, 01111111b	; Result = Year - 1980
  2247 000081AA 6605BC07            <1> 	add	ax, 1980
  2248                              <1> 
  2249 000081AE B10A                <1> 	mov	cl, 10
  2250 000081B0 F6F1                <1> 	div	cl		; Q -> AL, R -> AH 
  2251 000081B2 80CC30              <1> 	or	ah, '0'
  2252 000081B5 8825[30110100]      <1> 	mov	[File_Year+3], ah
  2253 000081BB D40A                <1> 	aam
  2254 000081BD 86E0                <1> 	xchg	ah, al
  2255 000081BF 80CC30              <1> 	or	ah, '0'	  ; Convert to ASCII
  2256 000081C2 8825[2F110100]      <1> 	mov	[File_Year+2], ah
  2257 000081C8 D40A                <1> 	aam
  2258 000081CA 86C4                <1> 	xchg	al, ah
  2259 000081CC 660D3030            <1> 	or	ax, '00'
  2260 000081D0 66A3[2D110100]      <1> 	mov	[File_Year], ax
  2261                              <1> 
  2262                              <1> loc_show_line:
  2263 000081D6 56                  <1> 	push	esi
  2264 000081D7 BE[0A110100]        <1> 	mov     esi, File_Name
  2265 000081DC E8ECE1FFFF          <1> 	call	print_msg
  2266 000081E1 BE[FF190100]        <1> 	mov	esi, nextline
  2267 000081E6 E8E2E1FFFF          <1> 	call	print_msg
  2268 000081EB 5E                  <1> 	pop	esi
  2269                              <1> 
  2270 000081EC FE0D[C5620100]      <1> 	dec	byte [PrintDir_RowCounter]
  2271 000081F2 0F84D4000000        <1>         jz      pause_dir_scroll
  2272                              <1> 
  2273                              <1> loc_next_entry:
  2274 000081F8 E899010000          <1> 	call	find_next_file
  2275 000081FD 0F8391FEFFFF        <1>         jnc     loc_dfname_use_this
  2276                              <1> 
  2277                              <1> loc_dir_ok:
  2278 00008203 B90A000000          <1> 	mov     ecx, 10
  2279 00008208 66A1[B0620100]      <1> 	mov	ax, [Dir_Count]
  2280 0000820E BF[4B110100]        <1> 	mov	edi, Decimal_Dir_Count
  2281 00008213 6639C8              <1> 	cmp	ax, cx ; 10
  2282 00008216 7216                <1> 	jb	short pass_ddc
  2283 00008218 47                  <1> 	inc	edi
  2284 00008219 6683F864            <1> 	cmp	ax, 100
  2285 0000821D 720F                <1> 	jb	short pass_ddc
  2286 0000821F 47                  <1> 	inc	edi
  2287 00008220 663DE803            <1> 	cmp	ax, 1000
  2288 00008224 7208                <1> 	jb	short pass_ddc
  2289 00008226 47                  <1> 	inc	edi
  2290 00008227 663D1027            <1> 	cmp	ax, 10000
  2291 0000822B 7201                <1> 	jb	short pass_ddc
  2292 0000822D 47                  <1> 	inc	edi
  2293                              <1> pass_ddc:
  2294 0000822E 886F01              <1> 	mov     [edi+1], ch ; 0
  2295                              <1> loc_ddc_rediv:
  2296 00008231 31D2                <1> 	xor     edx, edx
  2297 00008233 66F7F1              <1> 	div     cx	; 10
  2298 00008236 80C230              <1> 	add     dl, '0'
  2299 00008239 8817                <1> 	mov     [edi], dl
  2300 0000823B 4F                  <1> 	dec     edi
  2301 0000823C 6609C0              <1> 	or	ax, ax
  2302 0000823F 75F0                <1> 	jnz	short loc_ddc_rediv
  2303                              <1> 
  2304 00008241 66A1[AE620100]      <1> 	mov     ax, [File_Count]
  2305 00008247 BF[3A110100]        <1> 	mov     edi, Decimal_File_Count
  2306 0000824C 6639C8              <1> 	cmp     ax, cx ; 10
  2307 0000824F 7216                <1> 	jb      short pass_dfc
  2308 00008251 47                  <1> 	inc     edi
  2309 00008252 6683F864            <1> 	cmp     ax, 100
  2310 00008256 720F                <1> 	jb      short pass_dfc
  2311 00008258 47                  <1> 	inc     edi
  2312 00008259 663DE803            <1> 	cmp     ax, 1000
  2313 0000825D 7208                <1> 	jb      short pass_dfc
  2314 0000825F 47                  <1> 	inc     edi
  2315 00008260 663D1027            <1> 	cmp     ax, 10000
  2316 00008264 7201                <1> 	jb      short pass_dfc
  2317 00008266 47                  <1> 	inc     edi
  2318                              <1> pass_dfc:
  2319                              <1> 	;mov    cx, 10
  2320 00008267 886F01              <1> 	mov     [edi+1], ch ; 00
  2321                              <1> loc_dfc_rediv:
  2322                              <1> 	;xor	dx, dx
  2323 0000826A 30D2                <1> 	xor	dl, dl
  2324 0000826C 66F7F1              <1> 	div	cx
  2325 0000826F 80C230              <1> 	add	dl, '0'
  2326 00008272 8817                <1> 	mov	[edi], dl
  2327 00008274 4F                  <1> 	dec	edi
  2328 00008275 6609C0              <1> 	or	ax, ax
  2329 00008278 75F0                <1> 	jnz	short loc_dfc_rediv
  2330                              <1> 
  2331 0000827A BF[C4620100]        <1> 	mov     edi, TFS_Dec_End
  2332                              <1>         ;mov    byte [edi], 0
  2333 0000827F A1[B2620100]        <1> 	mov     eax, [Total_FSize]
  2334                              <1> 	;mov    ecx, 10
  2335                              <1> rediv_tfs_hex:
  2336                              <1> 	;sub	edx, edx
  2337 00008284 28D2                <1> 	sub	dl, dl
  2338 00008286 F7F1                <1> 	div	ecx
  2339 00008288 80C230              <1> 	add	dl, '0'
  2340 0000828B 4F                  <1> 	dec     edi
  2341 0000828C 8817                <1> 	mov     [edi], dl
  2342 0000828E 21C0                <1> 	and	eax, eax
  2343 00008290 75F2                <1> 	jnz	short rediv_tfs_hex
  2344                              <1> 	
  2345 00008292 893D[B6620100]      <1> 	mov	[TFS_Dec_Begin], edi
  2346 00008298 BE[38110100]        <1> 	mov	esi, Decimal_File_Count_Header
  2347 0000829D E82BE1FFFF          <1> 	call	print_msg
  2348 000082A2 BE[40110100]        <1> 	mov	esi, str_files
  2349 000082A7 E821E1FFFF          <1> 	call	print_msg
  2350 000082AC BE[51110100]        <1> 	mov	esi, str_dirs
  2351 000082B1 E817E1FFFF          <1> 	call	print_msg
  2352 000082B6 8B35[B6620100]      <1> 	mov	esi, [TFS_Dec_Begin]
  2353 000082BC E80CE1FFFF          <1> 	call	print_msg
  2354 000082C1 BE[62110100]        <1> 	mov	esi, str_bytes
  2355 000082C6 E802E1FFFF          <1> 	call	print_msg
  2356                              <1> 
  2357 000082CB C3                  <1> 	retn
  2358                              <1> 
  2359                              <1> pause_dir_scroll:
  2360 000082CC 28E4                <1> 	sub	ah, ah           
  2361 000082CE E84C89FFFF          <1> 	call	int16h
  2362 000082D3 3C1B                <1> 	cmp	al, 1Bh
  2363 000082D5 0F8428FFFFFF        <1>         je      loc_dir_ok
  2364 000082DB C605[C5620100]10    <1> 	mov	byte [PrintDir_RowCounter], 16 ; Reset counter
  2365 000082E2 E911FFFFFF          <1>         jmp     loc_next_entry
  2366                              <1> 
  2367                              <1> find_first_file:
  2368                              <1> 	; 11/02/2016
  2369                              <1> 	; 10/02/2016
  2370                              <1> 	; 08/02/2016 (TRDOS 386 = TRDOS v2.0)
  2371                              <1> 	; 09/10/2011
  2372                              <1> 	; 17/09/2009
  2373                              <1> 	; 2005
  2374                              <1> 	; INPUT ->
  2375                              <1> 	;	ESI = ASCIIZ File/Dir Name Address (in Current Directory)
  2376                              <1> 	;	AL = Attributes AND mask (The AND result must be equal to AL)
  2377                              <1> 	;	      bit 0 = Read Only
  2378                              <1> 	;	      bir 1 = Hidden
  2379                              <1> 	;	      bit 2 = System
  2380                              <1> 	;	      bit 3 = Volume Label
  2381                              <1> 	;	      bit 4 = Directory
  2382                              <1> 	;	      bit 5 = Archive
  2383                              <1> 	;	      bit 6 = Reserved, must be 0
  2384                              <1> 	;	      bit 7 = Reserved, must be 0
  2385                              <1> 	;       AH = Attributes Negative AND mask (The AND result must be ZERO)
  2386                              <1> 	;
  2387                              <1> 	; OUTPUT ->
  2388                              <1> 	;	CF = 1 -> Error, Error Code in EAX (AL)
  2389                              <1> 	;	CF = 0 ->
  2390                              <1> 	;	     ESI = Directory Entry (FindFile_DirEntry) Location
  2391                              <1> 	;	     EDI = Directory Buffer Directory Entry Location
  2392                              <1> 	;	     EAX = File Size
  2393                              <1> 	;	      BL = Attributes of The File/Directory
  2394                              <1> 	;	      BH = Long Name Yes/No Status (>0 is YES)
  2395                              <1> 	;             DX > 0 : Ambiguous filename chars are used
  2396                              <1> 	;
  2397                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI will be changed)
  2398                              <1> 
  2399 000082E7 66A3[76620100]      <1> 	mov	[FindFile_AttributesMask], ax
  2400 000082ED BF[78620100]        <1> 	mov	edi, FindFile_DirEntry ; TR-DOS Fullfilename formatted buffer
  2401 000082F2 31C0                <1> 	xor	eax, eax
  2402 000082F4 B90B000000          <1> 	mov	ecx, 11
  2403 000082F9 F3AB                <1> 	rep	stosd	; 44 bytes
  2404                              <1> 	;stosw		; +2 bytes 
  2405                              <1> 	    
  2406 000082FB BF[68620100]        <1> 	mov	edi, FindFile_Name ; FFF structure, offset 66
  2407 00008300 39FE                <1> 	cmp	esi, edi
  2408 00008302 7408                <1> 	je	short loc_fff_mfn_ok
  2409 00008304 89FA                <1> 	mov	edx, edi 
  2410                              <1> 	 ; move 13 bytes
  2411 00008306 A5                  <1> 	movsd
  2412 00008307 A5                  <1> 	movsd
  2413 00008308 A5                  <1> 	movsd
  2414 00008309 AA                  <1> 	stosb
  2415 0000830A 89D6                <1> 	mov	esi, edx
  2416                              <1> loc_fff_mfn_ok:
  2417 0000830C BF[17620100]        <1> 	mov	edi, Dir_Entry_Name ; Dir Entry Format File Name
  2418 00008311 E8D7200000          <1> 	call	convert_file_name
  2419 00008316 89FE                <1> 	mov	esi, edi ; offset Dir_Entry_Name
  2420                              <1> 
  2421 00008318 66A1[76620100]      <1> 	mov	ax, [FindFile_AttributesMask]
  2422                              <1> 	;xor	ecx, ecx
  2423 0000831E 30C9                <1> 	xor	cl, cl  
  2424 00008320 E8D11D0000          <1> 	call	locate_current_dir_file
  2425 00008325 726E                <1> 	jc	short loc_fff_retn
  2426                              <1> 	; EDI = Directory Entry
  2427                              <1> 	; EBX = Directory Buffer Entry Index/Number
  2428                              <1> 
  2429                              <1> loc_fff_fnf_ln_check:
  2430 00008327 30ED                <1> 	xor	ch, ch 
  2431 00008329 80F60F              <1> 	xor	dh, 0Fh
  2432 0000832C 7408                <1> 	jz	short loc_fff_longname_yes
  2433 0000832E 882D[75620100]      <1> 	mov	[FindFile_LongNameYes], ch ; 0
  2434 00008334 EB0C                <1> 	jmp	short loc_fff_longname_no
  2435                              <1> 
  2436                              <1> loc_fff_longname_yes:
  2437                              <1> 	;inc	byte [FindFile_LongNameYes]
  2438 00008336 8A0D[82610100]      <1> 	mov	cl, [LFN_EntryLength]  
  2439 0000833C 880D[75620100]      <1> 	mov	[FindFile_LongNameEntryLength], cl ; FindFile_LongNameYes
  2440                              <1> 
  2441                              <1> loc_fff_longname_no:
  2442                              <1> 	;mov	bx, [DirBuff_CurrentEntry]
  2443 00008342 66891D[A0620100]    <1> 	mov	[FindFile_DirEntryNumber], bx
  2444 00008349 6689C2              <1> 	mov	dx, ax ; Ambiguous Filename chars used sign > 0
  2445                              <1> 
  2446 0000834C A0[86590100]        <1> 	mov	al, [Current_Drv]
  2447 00008351 A2[26620100]        <1> 	mov	[FindFile_Drv], al 
  2448                              <1> 
  2449 00008356 A1[80590100]        <1> 	mov	eax, [Current_Dir_FCluster]
  2450 0000835B A3[98620100]        <1> 	mov	[FindFile_DirFirstCluster], eax
  2451                              <1> 
  2452 00008360 A1[B1600100]        <1> 	mov	eax, [DirBuff_Cluster]
  2453 00008365 A3[9C620100]        <1> 	mov	[FindFile_DirCluster], eax
  2454                              <1> 
  2455 0000836A 66FF05[A2620100]    <1> 	inc	word [FindFile_MatchCounter]
  2456                              <1> 
  2457 00008371 89FB                <1> 	mov	ebx, edi
  2458 00008373 89FE                <1> 	mov	esi, edi
  2459 00008375 BF[78620100]        <1> 	mov	edi, FindFile_DirEntry
  2460 0000837A 89F8                <1> 	mov	eax, edi
  2461 0000837C B108                <1> 	mov	cl, 8
  2462 0000837E F3A5                <1> 	rep	movsd
  2463 00008380 89C6                <1> 	mov	esi, eax
  2464 00008382 89DF                <1> 	mov	edi, ebx
  2465                              <1> 
  2466 00008384 A1[94620100]        <1> 	mov	eax, [FindFile_DirEntry+28] ; File Size
  2467                              <1> 
  2468 00008389 8A1D[83620100]      <1> 	mov	bl, [FindFile_DirEntry+11] ; File Attributes 
  2469 0000838F 8A3D[75620100]      <1> 	mov	bh, [FindFile_LongNameYes]
  2470                              <1> 
  2471                              <1> 	;mov	cx, [DirBuff_EntryCounter]
  2472                              <1> 	;mov	[FindFile_DirEntryNumber], cx
  2473                              <1> 	;mov	cx, [FindFile_DirEntryNumber]
  2474                              <1> 	; ecx = 0
  2475                              <1> 
  2476                              <1> loc_fff_retn:
  2477 00008395 C3                  <1> 	retn
  2478                              <1> 
  2479                              <1> find_next_file:
  2480                              <1> 	; 15/10/2016
  2481                              <1> 	; 10/02/2016
  2482                              <1> 	; 08/02/2016 (TRDOS 386 = TRDOS v2.0)
  2483                              <1> 	; 06/02/2011
  2484                              <1> 	; 17/09/2009
  2485                              <1> 	; 2005
  2486                              <1> 	; INPUT ->
  2487                              <1> 	;	NONE, Find First File Parameters
  2488                              <1> 	; OUTPUT ->
  2489                              <1> 	;	CF = 1 -> Error, Error Code in EAX (AL)
  2490                              <1> 	;	CF = 0 -> 
  2491                              <1> 	;	    ESI = Directory Entry (FindFile_DirEntry) Location
  2492                              <1> 	;	    EDI = Directory Buffer Directory Entry Location
  2493                              <1> 	;	    EAX = File Size
  2494                              <1> 	;	      BL = Attributes of The File/Directory
  2495                              <1> 	;	      BH = Long Name Yes/No Status (>0 is YES)
  2496                              <1> 	;             DX > 0 : Ambiguous filename chars are used 
  2497                              <1> 	;
  2498                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI will be changed)
  2499                              <1> 
  2500 00008396 66833D[A2620100]00  <1> 	cmp	word [FindFile_MatchCounter], 0
  2501 0000839E 7707                <1> 	ja	short loc_start_search_next_file
  2502                              <1> 
  2503                              <1> loc_fnf_stc_retn:
  2504 000083A0 F9                  <1> 	stc
  2505                              <1> loc_fnf_ax12h_retn:
  2506 000083A1 B80C000000          <1> 	mov	eax, 12 ; No More files
  2507                              <1> ;loc_fnf_retn:
  2508 000083A6 C3                  <1> 	retn
  2509                              <1> 
  2510                              <1> loc_start_search_next_file:
  2511 000083A7 668B1D[A0620100]    <1> 	mov	bx, [FindFile_DirEntryNumber]
  2512 000083AE 6643                <1> 	inc	bx
  2513 000083B0 663B1D[AF600100]    <1> 	cmp	bx, [DirBuff_LastEntry]
  2514 000083B7 7719                <1> 	ja	short loc_cont_search_next_file
  2515                              <1> 
  2516                              <1> loc_fnf_search:
  2517 000083B9 BE[17620100]        <1> 	mov	esi, Dir_Entry_Name
  2518 000083BE 66A1[76620100]      <1> 	mov	ax, [FindFile_AttributesMask]
  2519 000083C4 6631C9              <1> 	xor	cx, cx
  2520 000083C7 E82E1E0000          <1> 	call	find_directory_entry
  2521 000083CC 0F8355FFFFFF        <1>         jnc     loc_fff_fnf_ln_check
  2522                              <1> 
  2523                              <1> loc_cont_search_next_file:
  2524 000083D2 31DB                <1> 	xor	ebx, ebx
  2525 000083D4 8A3D[86590100]      <1> 	mov	bh, [Current_Drv]
  2526 000083DA BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2527 000083DF 01DE                <1> 	add	esi, ebx
  2528                              <1> 
  2529 000083E1 803D[84590100]00    <1> 	cmp	byte [Current_Dir_Level], 0
  2530 000083E8 7608                <1> 	jna	short loc_fnf_check_FAT_type
  2531 000083EA 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  2532 000083EE 72B1                <1> 	jb	short loc_fnf_ax12h_retn
  2533 000083F0 EB06                <1> 	jmp	short loc_fnf_check_next_cluster
  2534                              <1>  
  2535                              <1> loc_fnf_check_FAT_type:
  2536 000083F2 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3
  2537 000083F6 72A9                <1> 	jb	short loc_fnf_ax12h_retn
  2538                              <1> 
  2539                              <1> loc_fnf_check_next_cluster:
  2540 000083F8 A1[B1600100]        <1> 	mov	eax, [DirBuff_Cluster]
  2541 000083FD E8CA370000          <1> 	call	get_next_cluster
  2542 00008402 7306                <1> 	jnc	short loc_fnf_load_next_dir_cluster
  2543 00008404 09C0                <1> 	or	eax, eax
  2544 00008406 7498                <1> 	jz	short loc_fnf_stc_retn
  2545                              <1> 	;mov	eax, 17 ;Drive not ready or read error
  2546 00008408 F5                  <1>  	cmc	;stc
  2547                              <1> loc_fnf_retn:
  2548 00008409 C3                  <1> 	retn
  2549                              <1> 
  2550                              <1> loc_fnf_load_next_dir_cluster:
  2551 0000840A E8A3390000          <1> 	call	load_FAT_sub_directory
  2552 0000840F 72F8                <1> 	jc	short loc_fnf_retn
  2553 00008411 6631DB              <1> 	xor	bx, bx
  2554 00008414 66891D[A0620100]    <1> 	mov	[FindFile_DirEntryNumber], bx
  2555 0000841B EB9C                <1> 	jmp	short loc_fnf_search
  2556                              <1> 
  2557                              <1> get_and_print_longname:
  2558                              <1> 	; 16/10/2016
  2559                              <1> 	; 13/02/2016 (TRDOS 386 = TRDOS v2.0)
  2560                              <1> 	; 24/01/2010
  2561                              <1> 	; 17/10/2009 (CMD_INTR.ASM, 'cmp_cmd_longname')
  2562                              <1> get_longname_fchar:
  2563 0000841D 803E20              <1> 	cmp	byte [esi], 20h
  2564 00008420 7701                <1> 	ja	short loc_find_longname
  2565                              <1> 	;jb	short loc_longname_retn
  2566                              <1> 	;inc	esi
  2567                              <1> 	;je	short get_longname_fchar
  2568                              <1> ;loc_longname_retn:
  2569 00008422 C3                  <1> 	retn
  2570                              <1> loc_find_longname:
  2571 00008423 E839210000          <1> 	call	find_longname
  2572 00008428 7328                <1> 	jnc	short loc_print_longname
  2573                              <1> 	
  2574 0000842A 08C0                <1> 	or	al, al
  2575 0000842C 741A                <1> 	jz	short loc_longname_not_found
  2576                              <1> 	  
  2577                              <1> 	; 16/10/2016 (15h -> 15, 17)
  2578 0000842E 3C0F                <1> 	cmp	al, 15
  2579 00008430 0F84B6F7FFFF        <1> 	je	cd_drive_not_ready ; drive not ready
  2580                              <1> 				   ; or
  2581 00008436 3C11                <1> 	cmp	al, 17		   ; read error	
  2582 00008438 0F84AEF7FFFF        <1> 	je	cd_drive_not_ready 
  2583                              <1> 
  2584                              <1> loc_ln_file_dir_not_found:
  2585 0000843E BE[8D100100]        <1> 	mov	esi, Msg_File_Directory_Not_Found
  2586                              <1> 	;call	print_msg	
  2587                              <1>         ;retn
  2588 00008443 E985DFFFFF          <1> 	jmp	print_msg
  2589                              <1> 
  2590                              <1> loc_longname_not_found:
  2591 00008448 BE[AC100100]        <1>         mov     esi, Msg_LongName_Not_Found
  2592                              <1> 	;call	print_msg	
  2593                              <1>         ;retn
  2594 0000844D E97BDFFFFF          <1> 	jmp	print_msg
  2595                              <1> 
  2596                              <1> loc_print_longname:
  2597                              <1> 	;mov	esi, LongFileName
  2598 00008452 BF[865A0100]        <1> 	mov	edi, TextBuffer
  2599 00008457 57                  <1> 	push	edi 
  2600 00008458 3C00                <1> 	cmp	al, 0
  2601 0000845A 7708                <1> 	ja	short loc_print_longname_1
  2602                              <1> loc_print_FS_longname: ; Singlix FS (64 byte ASCIIZ file name)
  2603 0000845C AC                  <1> 	lodsb
  2604 0000845D AA                  <1> 	stosb  
  2605 0000845E 08C0                <1> 	or	al, al
  2606 00008460 75FA                <1> 	jnz	short loc_print_FS_longname
  2607 00008462 EB07                <1> 	jmp	short loc_print_longname_2
  2608                              <1> 	;
  2609                              <1> loc_print_longname_1: ; MS Windows long name (UNICODE chars)
  2610 00008464 66AD                <1> 	lodsw
  2611 00008466 AA                  <1> 	stosb  
  2612 00008467 08C0                <1> 	or	al, al
  2613 00008469 75F9                <1> 	jnz	short loc_print_longname_1
  2614                              <1> 	;
  2615                              <1> loc_print_longname_2:	
  2616 0000846B 5E                  <1> 	pop	esi
  2617 0000846C E85CDFFFFF          <1> 	call	print_msg
  2618 00008471 BE[FF190100]        <1>   	mov	esi, nextline
  2619                              <1> 	;call	print_msg
  2620                              <1> 	;retn
  2621 00008476 E952DFFFFF          <1> 	jmp	print_msg	
  2622                              <1> 
  2623                              <1> show_file:
  2624                              <1> 	; 18/02/2016
  2625                              <1> 	; 17/02/2016
  2626                              <1> 	; 15/02/2016 (TRDOS 386 = TRDOS v2.0)
  2627                              <1> 	; 13/09/2011 (CMD_INTR.ASM, 'cmp_cmd_show')
  2628                              <1> 	; 08/11/2009
  2629                              <1> 
  2630                              <1> loc_show_parse_path_name:
  2631 0000847B BF[26620100]        <1> 	mov	edi, FindFile_Drv
  2632 00008480 E833200000          <1> 	call	parse_path_name
  2633 00008485 0F824CF9FFFF        <1> 	jc	loc_cmd_failed
  2634                              <1> 
  2635                              <1> loc_show_check_filename_exists:
  2636 0000848B BE[68620100]        <1> 	mov	esi, FindFile_Name
  2637 00008490 803E20              <1> 	cmp	byte [esi], 20h
  2638 00008493 0F863EF9FFFF        <1> 	jna	loc_cmd_failed
  2639                              <1> 
  2640                              <1> 	; 15/02/2016 (invalid file name check)
  2641 00008499 E807020000          <1> 	call	check_filename 	
  2642 0000849E 730A                <1> 	jnc	short loc_show_change_drv
  2643                              <1> 
  2644 000084A0 BE[78110100]        <1> 	mov	esi, Msg_invalid_name_chars
  2645 000084A5 E923DFFFFF          <1> 	jmp	print_msg
  2646                              <1>    
  2647                              <1> loc_show_change_drv:
  2648 000084AA 8A35[86590100]      <1> 	mov	dh, [Current_Drv]
  2649 000084B0 8835[E2600100]      <1> 	mov	[RUN_CDRV], dh
  2650 000084B6 8A15[26620100]      <1> 	mov	dl, [FindFile_Drv]
  2651 000084BC 38F2                <1> 	cmp	dl, dh
  2652 000084BE 740B                <1> 	je	short loc_show_change_directory
  2653 000084C0 E87FEAFFFF          <1> 	call	change_current_drive
  2654                              <1> 	;jc	loc_file_rw_cmd_failed
  2655 000084C5 0F8237F9FFFF        <1> 	jc	loc_run_cmd_failed
  2656                              <1> 
  2657                              <1> loc_show_change_directory:
  2658 000084CB 803D[27620100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  2659 000084D2 7618                <1> 	jna	short loc_findload_showfile
  2660                              <1> 
  2661 000084D4 FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  2662 000084DA BE[27620100]        <1> 	mov	esi, FindFile_Directory
  2663 000084DF 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2664 000084E1 E8BC190000          <1> 	call	change_current_directory
  2665                              <1> 	;jc	loc_file_rw_cmd_failed
  2666 000084E6 0F8216F9FFFF        <1> 	jc	loc_run_cmd_failed
  2667                              <1> 
  2668                              <1> ;loc_show_change_prompt_dir_string:
  2669                              <1> 	;call	change_prompt_dir_string
  2670                              <1> 
  2671                              <1> loc_findload_showfile:
  2672                              <1> 	; 15/02/2016
  2673 000084EC BE[68620100]        <1> 	mov	esi, FindFile_Name
  2674 000084F1 BF[17620100]        <1> 	mov	edi, Dir_Entry_Name ; Dir Entry Format File Name
  2675 000084F6 E8F21E0000          <1> 	call	convert_file_name
  2676 000084FB 89FE                <1> 	mov	esi, edi ; offset Dir_Entry_Name
  2677                              <1> 
  2678 000084FD 28C0                <1> 	sub	al, al	; Attrib AND mask = 0
  2679                              <1> 	; Directory attribute : 10h
  2680                              <1> 	; Volume name attribute: 8h
  2681 000084FF B418                <1> 	mov	ah, 00011000b ; 18h (Attrib NAND, AND --> zero mask)
  2682                              <1> 	;
  2683 00008501 6631C9              <1> 	xor	cx, cx  
  2684 00008504 E8ED1B0000          <1> 	call	locate_current_dir_file
  2685                              <1> 	;jc	loc_file_rw_cmd_failed
  2686 00008509 0F82F3F8FFFF        <1> 	jc	loc_run_cmd_failed
  2687                              <1> 
  2688                              <1> loc_show_load_file:
  2689                              <1> 	; EDI = Directory Entry
  2690 0000850F 668B4714            <1> 	mov	ax, [edi+DirEntry_FstClusHI] ; First Cluster High Word
  2691 00008513 C1E010              <1> 	shl	eax, 16
  2692 00008516 668B471A            <1> 	mov	ax, [edi+DirEntry_FstClusLO] ; First Cluster Low Word
  2693 0000851A A3[D0620100]        <1> 	mov	[Show_Cluster], eax
  2694 0000851F 8B471C              <1> 	mov	eax, [edi+DirEntry_FileSize] ; File Size
  2695 00008522 21C0                <1> 	and	eax, eax ; Empty file !
  2696 00008524 0F8491000000        <1>         jz      end_of_show_file 
  2697 0000852A A3[D4620100]        <1> 	mov	[Show_FileSize], eax
  2698 0000852F 31C0                <1> 	xor	eax, eax
  2699 00008531 A3[D8620100]        <1> 	mov	[Show_FilePointer], eax ; 0
  2700 00008536 66A3[DC620100]      <1> 	mov	[Show_ClusterPointer], ax ; 0
  2701 0000853C 29DB                <1> 	sub	ebx, ebx
  2702 0000853E 8A3D[86590100]      <1> 	mov	bh, [Current_Drv]
  2703 00008544 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2704 00008549 01DE                <1> 	add	esi, ebx
  2705 0000854B 8935[CC620100]      <1> 	mov	[Show_LDDDT], esi ; Logical DOS Drv Description Table addr
  2706                              <1> 
  2707 00008551 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0	
  2708 00008555 7713                <1> 	ja	short loc_show_calculate_cluster_size
  2709                              <1> 	; Singlix FS
  2710                              <1> 	; First Cluster Number is FDT number (in compatibility buffer)
  2711 00008557 8B15[D0620100]      <1> 	mov	edx, [Show_Cluster] ; Compatibility dir. buffer value (FDT)	
  2712 0000855D 8915[C8620100]      <1> 	mov	[Show_FDT], edx
  2713 00008563 31C0                <1> 	xor	eax, eax
  2714 00008565 A3[D0620100]        <1> 	mov	[Show_Cluster], eax ; Sector index  = 0
  2715                              <1> 				    ; (next time it will be 1)			
  2716                              <1> loc_show_calculate_cluster_size:
  2717 0000856A 668B5E11            <1> 	mov	bx, [esi+LD_BPB+BPB_BytsPerSec] ; FAT 12-16-32 (512)
  2718                              <1> 	; BX = 512 = [esi+LD_FS_BytesPerSec] ; Singlix FS	
  2719 0000856E 8A4613              <1> 	mov	al, [esi+LD_BPB+BPB_SecPerClust] ; FAT 12-16-32 (<= 128)
  2720                              <1> 	; AL = 1 = [esi+LD_FS_Reserved2] ; SectPerClust for Singlix FS
  2721 00008571 F7E3                <1> 	mul	ebx	
  2722                              <1> 
  2723                              <1> 	;cmp	eax, 65536 ; non-compatible (very big) cluster size
  2724                              <1> 	;ja	short end_of_show_file	
  2725 00008573 66A3[DE620100]      <1> 	mov	[Show_ClusterSize], ax
  2726                              <1> 
  2727                              <1> loc_start_show_file:
  2728 00008579 BE[FF190100]        <1> 	mov	esi, nextline
  2729 0000857E E84ADEFFFF          <1> 	call	print_msg
  2730                              <1> 
  2731 00008583 A1[D0620100]        <1> 	mov	eax, [Show_Cluster]
  2732 00008588 C605[E0620100]17    <1> 	mov	byte [Show_RowCount], 23
  2733                              <1> 
  2734                              <1> 	; 17/02/2016
  2735 0000858F 8B35[CC620100]      <1> 	mov	esi, [Show_LDDDT]
  2736                              <1> 
  2737                              <1> loc_show_next_cluster:
  2738                              <1> 	; 15/02/2016
  2739 00008595 BB00000700          <1> 	mov	ebx, Cluster_Buffer ; 70000h (for current TRDOS 386 version)
  2740                              <1> 	; ESI = Logical DOS drv description table address
  2741 0000859A E851380000          <1> 	call	read_cluster
  2742                              <1> 	;jc	loc_file_rw_cmd_failed
  2743 0000859F 0F825DF8FFFF        <1> 	jc	loc_run_cmd_failed
  2744                              <1> 
  2745 000085A5 31DB                <1> 	xor 	ebx, ebx
  2746                              <1> loc_show_next_byte:
  2747 000085A7 803D[E0620100]00    <1> 	cmp	byte [Show_RowCount], 0
  2748 000085AE 7521                <1> 	jne	short pass_show_wait_for_key
  2749 000085B0 30E4                <1> 	xor	ah, ah
  2750 000085B2 E86886FFFF          <1> 	call	int16h
  2751 000085B7 3C1B                <1> 	cmp	al, 1Bh
  2752 000085B9 750F                <1> 	jne	short pass_exit_show
  2753                              <1> end_of_show_file:
  2754                              <1> pass_show_file:
  2755 000085BB BE[FF190100]        <1> 	mov	esi, nextline
  2756 000085C0 E808DEFFFF          <1> 	call	print_msg
  2757 000085C5 E94B010000          <1> 	jmp	loc_file_rw_restore_retn
  2758                              <1> 
  2759                              <1> pass_exit_show:
  2760 000085CA C605[E0620100]14    <1> 	mov	byte [Show_RowCount], 20
  2761                              <1> pass_show_wait_for_key:
  2762 000085D1 81C300000700        <1> 	add	ebx, Cluster_Buffer
  2763 000085D7 8A03                <1> 	mov	al, [ebx]
  2764 000085D9 3C0D                <1> 	cmp	al, 0Dh
  2765 000085DB 0F8590000000        <1>         jne     loc_show_check_tab_space
  2766 000085E1 FE0D[E0620100]      <1> 	dec	byte [Show_RowCount]
  2767                              <1> pass_show_dec_rowcount:
  2768 000085E7 B307                <1> 	mov	bl, 7 ; (light gray character color, black background)
  2769 000085E9 8A3D[EE580100]      <1> 	mov	bh, [ACTIVE_PAGE] ; [ptty]
  2770 000085EF E8C796FFFF          <1> 	call	_write_tty
  2771                              <1> loc_show_check_eof:
  2772 000085F4 FF05[D8620100]      <1> 	inc	dword [Show_FilePointer]
  2773 000085FA A1[D8620100]        <1> 	mov	eax, [Show_FilePointer]
  2774 000085FF 3B05[D4620100]      <1> 	cmp	eax, [Show_FileSize]
  2775 00008605 73B4                <1> 	jnb	short end_of_show_file
  2776 00008607 66FF05[DC620100]    <1> 	inc	word [Show_ClusterPointer]
  2777 0000860E 0FB71D[DC620100]    <1> 	movzx	ebx, word [Show_ClusterPointer]
  2778                              <1> 
  2779                              <1> 	; 17/02/2016
  2780                              <1> 	; (sector boundary -9 bits- check, 512 = 0)
  2781 00008615 66F7C3FF01          <1>         test    bx, 1FFh ;  1 to 511
  2782 0000861A 758B                <1> 	jnz	short loc_show_next_byte
  2783                              <1> 
  2784                              <1> 	; 16/02/2016
  2785 0000861C 8B35[CC620100]      <1> 	mov	esi, [Show_LDDDT]
  2786                              <1> 	;
  2787 00008622 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  2788 00008626 7719                <1> 	ja	short loc_show_check_fat_cluster_size
  2789                              <1> 
  2790                              <1> 	; Singlix FS
  2791                              <1> 	; 1 sector, more... (cluster size = 1 sector)
  2792 00008628 A1[D0620100]        <1> 	mov	eax, [Show_Cluster]
  2793 0000862D 40                  <1> 	inc	eax
  2794 0000862E A3[D0620100]        <1> 	mov	[Show_Cluster], eax
  2795                              <1> 
  2796 00008633 6621DB              <1> 	and	bx, bx ; 65536 -> 0
  2797 00008636 0F856BFFFFFF        <1>         jnz	loc_show_next_byte
  2798 0000863C E954FFFFFF          <1> 	jmp     loc_show_next_cluster
  2799                              <1> 	 
  2800                              <1> loc_show_check_fat_cluster_size:
  2801                              <1> 	; 17/02/2016
  2802 00008641 663B1D[DE620100]    <1> 	cmp	bx, [Show_ClusterSize] ; cluster size in bytes
  2803 00008648 0F8259FFFFFF        <1>         jb	loc_show_next_byte
  2804 0000864E 66C705[DC620100]00- <1> 	mov	word [Show_ClusterPointer], 0
  2804 00008656 00                  <1>
  2805                              <1> 
  2806 00008657 A1[D0620100]        <1> 	mov	eax, [Show_Cluster]
  2807                              <1> 	;mov	esi, [Show_LDDDT]
  2808                              <1> loc_show_get_next_cluster:
  2809 0000865C E86B350000          <1> 	call	get_next_cluster
  2810                              <1> 	;jc	loc_file_rw_cmd_failed
  2811 00008661 0F829BF7FFFF        <1> 	jc	loc_run_cmd_failed
  2812                              <1> loc_show_update_ccluster:
  2813 00008667 A3[D0620100]        <1> 	mov	[Show_Cluster], eax			
  2814 0000866C E924FFFFFF          <1>         jmp     loc_show_next_cluster
  2815                              <1> 
  2816                              <1> loc_show_check_tab_space:
  2817 00008671 3C09                <1> 	cmp	al, 09h
  2818 00008673 0F856EFFFFFF        <1>         jne     pass_show_dec_rowcount
  2819                              <1> loc_show_put_tab_space:
  2820 00008679 8A3D[EE580100]      <1> 	mov	bh, [ACTIVE_PAGE] ; [ptty]
  2821 0000867F E8C692FFFF          <1> 	call	get_cpos
  2822                              <1> 	; dl = cursor column
  2823 00008684 80E207              <1> 	and	dl, 7 ; 18/02/2016
  2824                              <1> 	;shr	bh, 1 ; [ACTIVE_PAGE]
  2825 00008687 8A3D[EE580100]      <1> 	mov	bh, [ACTIVE_PAGE]
  2826 0000868D B307                <1> 	mov	bl, 7 ; color attribute
  2827                              <1> loc_show_put_space_chars:
  2828 0000868F B020                <1> 	mov	al, 20h ; space
  2829                              <1> 	;mov	bh, [ACTIVE_PAGE] ; [ptty]
  2830                              <1> 	;mov	bl, 7 ; color attribute
  2831                              <1> 	;push	dx
  2832 00008691 52                  <1> 	push	edx ; 29/12/2017
  2833 00008692 E82496FFFF          <1> 	call	_write_tty
  2834 00008697 5A                  <1> 	pop	edx ; 29/12/2017
  2835                              <1> 	;pop	dx
  2836                              <1> 	; 18/02/2016
  2837 00008698 80FA07              <1> 	cmp	dl, 7
  2838 0000869B 0F8353FFFFFF        <1> 	jnb	loc_show_check_eof
  2839 000086A1 FEC2                <1> 	inc	dl
  2840 000086A3 EBEA                <1> 	jmp	short loc_show_put_space_chars
  2841                              <1> 
  2842                              <1> check_filename:
  2843                              <1> 	; 10/10/2016
  2844                              <1> 	; 15/02/2016 (TRDOS 386 = TRDOS v2.0)
  2845                              <1> 	; 07/08/2010 (FILE.ASM, 'proc_check_filename')
  2846                              <1> 	; 10/07/2010
  2847                              <1> 	; Derived from 'proc_check_filename'
  2848                              <1> 	; in the old TRDOS.ASM (09/02/2005).
  2849                              <1> 	;
  2850                              <1> 	; INPUT -> 
  2851                              <1> 	;	ESI = Dot File Name Location
  2852                              <1> 	; OUTPUT ->
  2853                              <1> 	;	cf = 1 -> error code in AL
  2854                              <1> 	;	     AL = ERR_INV_FILE_NAME (=26)
  2855                              <1> 	;		  Invalid file name chars   
  2856                              <1> 	;	cf = 0 -> valid file name
  2857                              <1> 	; 
  2858                              <1> 	;(EAX, ECX, EDI will be changed)
  2859                              <1> 
  2860                              <1> check_invalid_filename_chars:
  2861                              <1> 	; 15/02/2016 (TRDOS 386 = TRDOS v2.0)
  2862                              <1> 	; 10/07/2010 (FILE.ASM, 'proc_check_invalid_filename_chars')
  2863                              <1> 	; 10/02/2010
  2864                              <1> 	; Derived from 'proc_check_invalid_filename_chars'
  2865                              <1> 	; in the old TRDOS.ASM (09/02/2005).
  2866                              <1> 	;
  2867                              <1> 	; INPUT -> 
  2868                              <1> 	;	ESI = ASCIIZ FileName
  2869                              <1> 	; OUTPUT ->
  2870                              <1> 	;	cf = 1 -> invalid
  2871                              <1> 	;	cf = 0 -> valid
  2872                              <1> 	; 
  2873                              <1> 	;(EAX, ECX, EDI will be changed)
  2874                              <1>   
  2875 000086A5 56                  <1> 	push	esi
  2876                              <1> 
  2877 000086A6 BF[610E0100]        <1>         mov     edi, invalid_fname_chars
  2878 000086AB AC                  <1> 	lodsb
  2879                              <1> check_filename_next_char:
  2880 000086AC B914000000          <1> 	mov	ecx, sizeInvFnChars
  2881 000086B1 BF[610E0100]        <1> 	mov	edi, invalid_fname_chars
  2882                              <1> loc_scan_invalid_filename_char:
  2883 000086B6 AE                  <1> 	scasb 
  2884 000086B7 741F                <1> 	je	short loc_invalid_filename_stc 
  2885 000086B9 E2FB                <1> 	loop	loc_scan_invalid_filename_char
  2886 000086BB AC                  <1> 	lodsb
  2887 000086BC 3C1F                <1> 	cmp	al, 1Fh  ; 20h and above 
  2888 000086BE 77EC                <1> 	ja	short check_filename_next_char
  2889                              <1> 
  2890                              <1> check_filename_dot:
  2891 000086C0 8B3424              <1> 	mov	esi, [esp]
  2892                              <1> 
  2893 000086C3 B421                <1> 	mov	ah, 21h
  2894 000086C5 B908000000          <1> 	mov	ecx, 8
  2895                              <1> loc_check_filename_next_char:
  2896 000086CA AC                  <1> 	lodsb
  2897 000086CB 3C2E                <1> 	cmp	al, 2Eh
  2898 000086CD 7511                <1> 	jne	short pass_check_fn_dot_check
  2899                              <1> loc_check_filename_ext_0:
  2900 000086CF AC                  <1> 	lodsb
  2901 000086D0 38E0                <1> 	cmp	al, ah ; 21h
  2902 000086D2 7205                <1> 	jb	short loc_invalid_filename
  2903 000086D4 3C2E                <1> 	cmp	al, 2Eh
  2904 000086D6 7519                <1> 	jne	short loc_check_filename_ext_1
  2905                              <1> 
  2906                              <1> loc_invalid_filename_stc:
  2907                              <1> loc_check_fn_stc_rtn:
  2908 000086D8 F9                  <1> 	stc
  2909                              <1> loc_invalid_filename:
  2910                              <1> 	; 10/10/2016 (0Bh -> 26)
  2911 000086D9 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME ; (=26)
  2912                              <1> 	; Invalid file name chars
  2913                              <1> loc_check_fn_rtn:
  2914 000086DE 5E                  <1> 	pop	esi
  2915 000086DF C3                  <1> 	retn
  2916                              <1> 
  2917                              <1> pass_check_fn_dot_check:
  2918 000086E0 38E0                <1> 	cmp	al, ah ; 21h
  2919 000086E2 7224                <1> 	jb	short loc_check_fn_clc_rtn
  2920 000086E4 E2E4                <1> 	loop	loc_check_filename_next_char
  2921 000086E6 AC                  <1> 	lodsb
  2922 000086E7 38E0                <1> 	cmp	al, ah ; 21h
  2923 000086E9 721D                <1> 	jb	short loc_check_fn_clc_rtn
  2924 000086EB 3C2E                <1> 	cmp	al, 2Eh
  2925 000086ED 75E9                <1> 	jne	short loc_check_fn_stc_rtn
  2926 000086EF EBDE                <1> 	jmp	short loc_check_filename_ext_0
  2927                              <1> 
  2928                              <1> loc_check_filename_ext_1:
  2929 000086F1 AC                  <1> 	lodsb
  2930 000086F2 38E0                <1> 	cmp	al, ah ; 21h
  2931 000086F4 7212                <1> 	jb	short loc_check_fn_clc_rtn
  2932 000086F6 3C2E                <1> 	cmp	al, 2Eh
  2933 000086F8 74DE                <1> 	je	short loc_check_fn_stc_rtn
  2934 000086FA AC                  <1> 	lodsb
  2935 000086FB 38E0                <1> 	cmp	al, ah ; 21h
  2936 000086FD 7209                <1> 	jb	short loc_check_fn_clc_rtn
  2937 000086FF 3C2E                <1> 	cmp	al, 2Eh
  2938 00008701 74D5                <1> 	je	short loc_check_fn_stc_rtn
  2939 00008703 AC                  <1> 	lodsb
  2940 00008704 38E0                <1> 	cmp	al, ah ; 21h
  2941 00008706 73D0                <1> 	jnb	short loc_check_fn_stc_rtn
  2942                              <1> 
  2943                              <1> loc_check_fn_clc_rtn:
  2944 00008708 5E                  <1> 	pop	esi
  2945 00008709 F8                  <1> 	clc
  2946 0000870A C3                  <1> 	retn
  2947                              <1> 
  2948                              <1> loc_print_deleted_message:
  2949 0000870B BE[4D120100]        <1> 	mov	esi, Msg_Deleted
  2950 00008710 E8B8DCFFFF          <1> 	call	print_msg
  2951                              <1> 
  2952                              <1> 	;clc
  2953                              <1> 
  2954                              <1> loc_file_rw_restore_retn:
  2955                              <1> 	; 15/02/2016 (TRDOS 386 = TRDOS v2.0)
  2956                              <1> 	; 28/02/2010 (CMD_INTR.ASM)
  2957                              <1> loc_file_rw_cmd_failed:
  2958 00008715 9C                  <1> 	pushf 
  2959 00008716 E84FF7FFFF          <1> 	call	restore_cdir_after_cmd_fail	
  2960 0000871B 9D                  <1> 	popf
  2961 0000871C 720D                <1> 	jc	short loc_file_rw_check_write_fault
  2962 0000871E C3                  <1> 	retn
  2963                              <1> 
  2964                              <1> loc_permission_denied:
  2965                              <1> 	; 27/02/2016
  2966 0000871F BE[5A120100]        <1> 	mov	esi, Msg_Permission_Denied
  2967 00008724 E8A4DCFFFF          <1> 	call	print_msg
  2968 00008729 EBEA                <1> 	jmp	short loc_file_rw_restore_retn
  2969                              <1> 
  2970                              <1> loc_file_rw_check_write_fault:
  2971                              <1> 	;cmp	al, 1Dh ; Write Fault
  2972 0000872B 3C12                <1>         cmp	al, 18 ; 05/11/2016
  2973 0000872D 0F85D4F6FFFF        <1> 	jne     loc_run_cmd_failed_cmp_al
  2974 00008733 BE[42100100]        <1> 	mov	esi, Msg_Not_Ready_Write_Err
  2975                              <1> 	;call	print_msg
  2976                              <1> 	;retn
  2977 00008738 E990DCFFFF          <1> 	jmp	print_msg
  2978                              <1> 
  2979                              <1> make_directory:
  2980                              <1> 	; 21/02/2016 (TRDOS 386 = TRDOS v2.0)
  2981                              <1> 	; 12/03/2011 (CMD_INTR.ASM, 'cmp_cmd_mkdir')
  2982                              <1> 	; 14/08/2010
  2983                              <1> 	; 10/07/2010
  2984                              <1> 	; 29/11/2009
  2985                              <1> 	;
  2986                              <1> get_mkdir_fchar:
  2987                              <1> 	; esi = directory name
  2988 0000873D 803E20              <1> 	cmp	byte [esi], 20h
  2989 00008740 7701                <1>         ja	short loc_mkdir_parse_path_name
  2990                              <1> 
  2991                              <1> loc_mkdir_nodirname_retn:
  2992 00008742 C3                  <1> 	retn
  2993                              <1> 
  2994                              <1> loc_mkdir_parse_path_name:
  2995 00008743 BF[26620100]        <1> 	mov	edi, FindFile_Drv
  2996 00008748 E86B1D0000          <1>         call    parse_path_name
  2997 0000874D 0F8284F6FFFF        <1> 	jc	loc_cmd_failed
  2998                              <1> 
  2999                              <1> loc_mkdir_check_dirname_exists:
  3000 00008753 BE[68620100]        <1> 	mov	esi, FindFile_Name
  3001 00008758 803E20              <1> 	cmp	byte [esi], 20h
  3002 0000875B 0F8676F6FFFF        <1> 	jna	loc_cmd_failed
  3003 00008761 8935[E4620100]      <1> 	mov	[DelFile_FNPointer], esi
  3004 00008767 E839FFFFFF          <1> 	call	check_filename
  3005 0000876C 7259                <1> 	jc	short loc_mkdir_invalid_dir_name_chars
  3006                              <1> 
  3007                              <1> loc_mkdir_drv:
  3008 0000876E 8A35[86590100]      <1> 	mov	dh, [Current_Drv]
  3009 00008774 8835[E2600100]      <1> 	mov	[RUN_CDRV], dh
  3010                              <1> 	
  3011 0000877A 8A15[26620100]      <1> 	mov	dl, [FindFile_Drv]
  3012 00008780 38F2                <1> 	cmp	dl, dh
  3013 00008782 7407                <1> 	je	short loc_mkdir_change_directory
  3014                              <1> 
  3015 00008784 E8BBE7FFFF          <1> 	call	change_current_drive
  3016 00008789 728A                <1> 	jc	loc_file_rw_cmd_failed
  3017                              <1> 
  3018                              <1> loc_mkdir_change_directory:
  3019 0000878B 803D[27620100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  3020 00008792 7614                <1> 	jna	short loc_mkdir_find_directory
  3021                              <1> 
  3022 00008794 FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  3023 0000879A BE[27620100]        <1> 	mov	esi, FindFile_Directory
  3024 0000879F 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3025 000087A1 E8FC160000          <1> 	call	change_current_directory
  3026 000087A6 722E                <1> 	jc	short loc_mkdir_check_error_code
  3027                              <1> 
  3028                              <1> ;loc_mkdir_change_prompt_dir_string:
  3029                              <1> 	;call	change_prompt_dir_string
  3030                              <1> 
  3031                              <1> loc_mkdir_find_directory:
  3032                              <1> 	;mov	esi, FindFile_Name
  3033 000087A8 8B35[E4620100]      <1> 	mov	esi, [DelFile_FNPointer]
  3034                              <1> 	;xor	eax, eax
  3035 000087AE 6631C0              <1> 	xor	ax, ax ; any name (dir, file, volume)
  3036 000087B1 E831FBFFFF          <1> 	call	find_first_file
  3037 000087B6 721E                <1> 	jc	short loc_mkdir_check_error_code
  3038                              <1> 
  3039                              <1> loc_mkdir_directory_found:
  3040 000087B8 BE[A5110100]        <1> 	mov	esi, Msg_Name_Exists
  3041 000087BD E80BDCFFFF          <1> 	call	print_msg
  3042                              <1> 
  3043 000087C2 E94EFFFFFF          <1>         jmp     loc_file_rw_restore_retn
  3044                              <1> 
  3045                              <1> loc_mkdir_invalid_dir_name_chars:
  3046 000087C7 BE[78110100]        <1> 	mov	esi, Msg_invalid_name_chars
  3047 000087CC E8FCDBFFFF          <1> 	call	print_msg
  3048                              <1> 
  3049 000087D1 E93FFFFFFF          <1>         jmp     loc_file_rw_restore_retn
  3050                              <1> 
  3051                              <1> loc_mkdir_check_error_code:
  3052 000087D6 3C02                <1> 	cmp	al, 2
  3053                              <1> 	;je	short loc_mkdir_directory_not_found
  3054 000087D8 7406                <1> 	je	short loc_mkdir_ask_for_yes_no
  3055 000087DA F9                  <1> 	stc
  3056 000087DB E935FFFFFF          <1>         jmp     loc_file_rw_cmd_failed
  3057                              <1> 
  3058                              <1> loc_mkdir_directory_not_found:
  3059                              <1> loc_mkdir_ask_for_yes_no:
  3060 000087E0 BE[C6110100]        <1> 	mov	esi, Msg_DoYouWantMkdir
  3061 000087E5 E8E3DBFFFF          <1> 	call	print_msg
  3062 000087EA 8B35[E4620100]      <1> 	mov	esi, [DelFile_FNPointer]
  3063 000087F0 E8D8DBFFFF          <1> 	call	print_msg
  3064 000087F5 BE[E5110100]        <1> 	mov	esi, Msg_YesNo
  3065 000087FA E8CEDBFFFF          <1> 	call	print_msg
  3066                              <1> 
  3067 000087FF C605[EF110100]20    <1> 	mov	byte [Y_N_nextline], 20h
  3068                              <1> 
  3069                              <1> loc_mkdir_ask_again:
  3070 00008806 30E4                <1> 	xor	ah, ah
  3071 00008808 E81284FFFF          <1> 	call	int16h
  3072 0000880D 3C1B                <1> 	cmp	al, 1Bh
  3073                              <1> 	;je	short loc_do_not_make_directory
  3074 0000880F 7439                <1> 	je	short loc_mkdir_y_n_escape
  3075 00008811 24DF                <1> 	and	al, 0DFh ; y -> Y, n -> N
  3076 00008813 3C59                <1> 	cmp	al, 'Y' ; 'yes'
  3077 00008815 7404                <1> 	je	short loc_mkdir_yes_make_directory
  3078 00008817 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3079 00008819 75EB                <1> 	jne	short loc_mkdir_ask_again
  3080                              <1> 
  3081                              <1> loc_do_not_make_directory:
  3082                              <1> loc_mkdir_yes_make_directory:
  3083 0000881B E82E000000          <1> 	call	y_n_answer ; 29/12/2017
  3084                              <1> 	;cmp	al, 'Y' ; 'yes'
  3085                              <1> 	;cmc
  3086                              <1>         ;jnc	loc_file_rw_restore_retn
  3087 00008820 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3088 00008822 0F84EDFEFFFF        <1>         je	loc_file_rw_restore_retn  
  3089                              <1> 
  3090                              <1> loc_mkdir_call_make_sub_directory:
  3091 00008828 8B35[E4620100]      <1> 	mov	esi, [DelFile_FNPointer]
  3092 0000882E B110                <1> 	mov	cl, 10h ; Directory attributes 
  3093 00008830 E8821D0000          <1> 	call	make_sub_directory
  3094                              <1> loc_rename_file_ok: ; 06/03/2016
  3095 00008835 0F82DAFEFFFF        <1>         jc	loc_file_rw_cmd_failed
  3096                              <1> move_source_file_to_destination_OK:
  3097 0000883B BE[F3110100]        <1> 	mov	esi, Msg_OK
  3098 00008840 E888DBFFFF          <1> 	call	print_msg
  3099 00008845 E9CBFEFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3100                              <1> 
  3101                              <1> loc_mkdir_y_n_escape:
  3102 0000884A B04E                <1> 	mov	al, 'N' ; 'no'
  3103 0000884C EBCD                <1> 	jmp	short loc_do_not_make_directory
  3104                              <1> 
  3105                              <1> y_n_answer:
  3106                              <1> 	; 29/12/2017
  3107 0000884E A2[EF110100]        <1> 	mov	[Y_N_nextline], al
  3108                              <1> 	;push	ax
  3109 00008853 50                  <1> 	push	eax
  3110 00008854 BE[EF110100]        <1> 	mov	esi, Y_N_nextline
  3111 00008859 E86FDBFFFF          <1> 	call	print_msg
  3112 0000885E 58                  <1> 	pop	eax
  3113                              <1> 	;pop	ax
  3114 0000885F C3                  <1> 	retn
  3115                              <1> 
  3116                              <1> delete_directory:
  3117                              <1> 	; 29/12/2017
  3118                              <1> 	; 15/10/2016
  3119                              <1> 	; 01/03/2016, 06/03/2016
  3120                              <1> 	; 27/02/2016, 28/02/2016, 29/02/2016
  3121                              <1> 	; 26/02/2016 (TRDOS 386 = TRDOS v2.0)
  3122                              <1> 	; 16/10/2010 (CMD_INTR.ASM, 'cmp_cmd_rmdir')
  3123                              <1> 	; 05/06/2010
  3124                              <1> 	;
  3125                              <1> get_fchar:
  3126                              <1> 	; esi = directory name
  3127 00008860 803E20              <1> 	cmp	byte [esi], 20h
  3128 00008863 7701                <1>         ja	short loc_rmdir_parse_path_name
  3129                              <1> 
  3130                              <1> loc_rmdir_nodirname_retn:
  3131 00008865 C3                  <1> 	retn
  3132                              <1> 
  3133                              <1> loc_rmdir_parse_path_name:
  3134 00008866 BF[26620100]        <1> 	mov	edi, FindFile_Drv
  3135 0000886B E8481C0000          <1> 	call	parse_path_name
  3136 00008870 0F8261F5FFFF        <1> 	jc	loc_cmd_failed
  3137                              <1> 
  3138                              <1> loc_rmdir_check_dirname_exists:
  3139 00008876 BE[68620100]        <1> 	mov	esi, FindFile_Name
  3140 0000887B 803E20              <1> 	cmp	byte [esi], 20h
  3141 0000887E 0F8653F5FFFF        <1> 	jna	loc_cmd_failed
  3142 00008884 8935[E4620100]      <1> 	mov	[DelFile_FNPointer], esi 
  3143                              <1> 
  3144                              <1> loc_rmdir_drv:
  3145 0000888A 8A35[86590100]      <1> 	mov	dh, [Current_Drv]
  3146 00008890 8835[E2600100]      <1> 	mov	[RUN_CDRV], dh
  3147                              <1> 
  3148 00008896 8A15[26620100]      <1> 	mov	dl, [FindFile_Drv]
  3149 0000889C 38F2                <1> 	cmp	dl, dh
  3150 0000889E 740B                <1> 	je	short loc_rmdir_change_directory
  3151                              <1> 
  3152 000088A0 E89FE6FFFF          <1> 	call	change_current_drive
  3153 000088A5 0F826AFEFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3154                              <1> 
  3155                              <1> loc_rmdir_change_directory:
  3156 000088AB 803D[27620100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  3157 000088B2 7614                <1> 	jna	short loc_rmdir_find_directory
  3158                              <1> 
  3159 000088B4 FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  3160 000088BA BE[27620100]        <1> 	mov	esi, FindFile_Directory
  3161 000088BF 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3162 000088C1 E8DC150000          <1> 	call	change_current_directory
  3163 000088C6 7211                <1> 	jc	short loc_rmdir_check_error_code
  3164                              <1> 
  3165                              <1> ;loc_rmdir_change_prompt_dir_string:
  3166                              <1> 	;call	change_prompt_dir_string
  3167                              <1> 
  3168                              <1> loc_rmdir_find_directory:
  3169                              <1> 	;mov	esi, FindFile_Name
  3170 000088C8 8B35[E4620100]      <1> 	mov	esi, [DelFile_FNPointer]
  3171 000088CE 66B81008            <1> 	mov	ax, 0810h ; Only directories
  3172 000088D2 E810FAFFFF          <1> 	call	find_first_file
  3173 000088D7 730A                <1> 	jnc	short loc_rmdir_ambgfn_check
  3174                              <1> 
  3175                              <1> loc_rmdir_check_error_code:
  3176 000088D9 3C02                <1> 	cmp	al, 2
  3177 000088DB 740B                <1> 	je	short loc_rmdir_directory_not_found
  3178 000088DD F9                  <1> 	stc
  3179 000088DE E932FEFFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3180                              <1> 
  3181                              <1> loc_rmdir_ambgfn_check:
  3182 000088E3 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3183 000088E6 740F                <1> 	jz	short loc_rmdir_directory_found
  3184                              <1> 
  3185                              <1> loc_rmdir_directory_not_found:
  3186 000088E8 BE[64100100]        <1> 	mov	esi, Msg_Dir_Not_Found
  3187 000088ED E8DBDAFFFF          <1> 	call	print_msg
  3188                              <1> 
  3189 000088F2 E91EFEFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3190                              <1> 
  3191                              <1> loc_rmdir_directory_found:
  3192 000088F7 80E307              <1> 	and	bl, 07h ; Attributes
  3193 000088FA 0F851FFEFFFF        <1> 	jnz	loc_permission_denied
  3194                              <1> 
  3195                              <1> loc_rmdir_save_lnel: ; 28/02/2016
  3196                              <1>        ;mov	bh, [LongName_EntryLength]
  3197 00008900 883D[EE620100]      <1> 	mov	[DelFile_LNEL], bh ; Long name entry length (if > 0)
  3198                              <1> 	; edi = Directory Entry Offset (DirBuff)
  3199                              <1> 	; esi = Directory Entry (FFF Structure)
  3200                              <1> 	;mov	[DelFile_DirEntryAddr], edi ; not required
  3201                              <1> 	;mov	ax, [edi+20] ; First Cluster High Word
  3202                              <1>         ;shl	eax, 16
  3203                              <1> 	;mov	ax, [edi+26] ; First Cluster Low Word
  3204                              <1> 	; ROOT Dir First Cluster = 0
  3205                              <1>         ;cmp	eax, 2
  3206                              <1> 	;jb	loc_update_direntry_1
  3207                              <1> 
  3208                              <1> pass_rmdir_fc_check:
  3209 00008906 57                  <1> 	push	edi ; * (29/02/2016)
  3210                              <1> 
  3211 00008907 BE[F9110100]        <1> 	mov	esi, Msg_DoYouWantRmDir
  3212 0000890C E8BCDAFFFF          <1> 	call	print_msg
  3213 00008911 8B35[E4620100]      <1> 	mov	esi, [DelFile_FNPointer]
  3214 00008917 E8B1DAFFFF          <1> 	call	print_msg
  3215 0000891C BE[E5110100]        <1> 	mov	esi, Msg_YesNo
  3216 00008921 E8A7DAFFFF          <1> 	call	print_msg
  3217                              <1> 
  3218                              <1> loc_rmdir_ask_again:
  3219 00008926 30E4                <1> 	xor	ah, ah
  3220 00008928 E8F282FFFF          <1> 	call	int16h
  3221 0000892D 3C1B                <1> 	cmp	al, 1Bh
  3222                              <1> 	;je	short loc_do_not_delete_directory
  3223 0000892F 7433                <1>         je      loc_rmdir_y_n_escape ; 06/03/2016
  3224 00008931 24DF                <1> 	and	al, 0DFh
  3225 00008933 A2[EF110100]        <1> 	mov	[Y_N_nextline], al
  3226 00008938 3C59                <1> 	cmp	al, 'Y'
  3227 0000893A 7404                <1> 	je	short loc_rmdir_yes_delete_directory
  3228 0000893C 3C4E                <1> 	cmp	al, 'N'
  3229 0000893E 75E6                <1> 	jne	short loc_rmdir_ask_again
  3230                              <1> 
  3231                              <1> loc_do_not_delete_directory:
  3232                              <1> loc_rmdir_yes_delete_directory:
  3233 00008940 E809FFFFFF          <1> 	call	y_n_answer ; 29/12/2017
  3234 00008945 5F                  <1> 	pop	edi ; * (29/02/2016)
  3235                              <1> 	;cmp	al, 'Y' ; 'yes'
  3236                              <1> 	;cmc
  3237                              <1>         ;jnc	loc_file_rw_restore_retn
  3238 00008946 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3239 00008948 0F84C7FDFFFF        <1>         je	loc_file_rw_restore_retn 
  3240                              <1> 
  3241                              <1> 	; 29/12/2017
  3242 0000894E E869000000          <1> 	call	delete_sub_directory
  3243 00008953 7213                <1> 	jc	short loc_rmdir_cmd_failed
  3244                              <1> 
  3245                              <1> loc_rmdir_ok:
  3246 00008955 BE[F3110100]        <1> 	mov	esi, Msg_OK
  3247 0000895A E86EDAFFFF          <1> 	call	print_msg
  3248 0000895F E9B1FDFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3249                              <1> 
  3250                              <1> loc_rmdir_y_n_escape:
  3251 00008964 B04E                <1> 	mov	al, 'N' ; 'no'
  3252 00008966 EBD8                <1>         jmp     loc_do_not_delete_directory
  3253                              <1> 
  3254                              <1> loc_rmdir_cmd_failed:
  3255                              <1> 	; 29/12/2017
  3256 00008968 09C0                <1> 	or	eax, eax ; EAX = 0 -> Directory not empty!
  3257 0000896A 7426                <1> 	jz	short loc_rmdir_directory_not_empty
  3258                              <1> 
  3259                              <1> 	; EAX > 0 -> Error code in AL (or AX or EAX)
  3260                              <1> 
  3261 0000896C 833D[A2600100]01    <1> 	cmp	dword [FAT_ClusterCounter], 1
  3262 00008973 0F829CFDFFFF        <1> 	jb	loc_file_rw_cmd_failed	
  3263 00008979 F9                  <1> 	stc
  3264                              <1> loc_rmdir_cmd_return:
  3265                              <1> 	; 01/03/2016
  3266 0000897A 9C                  <1> 	pushf
  3267                              <1> 	; ESI = Logical DOS Drive Description Table address	
  3268 0000897B 66BB00FF            <1> 	mov	bx, 0FF00h ; BH = FFh -> use ESI for Drive parameters
  3269                              <1> 	           ; BL = 0 -> Recalculate free cluster count
  3270 0000897F 50                  <1> 	push	eax
  3271 00008980 E8C3380000          <1> 	call	calculate_fat_freespace	
  3272 00008985 58                  <1> 	pop	eax
  3273 00008986 9D                  <1> 	popf
  3274 00008987 0F8288FDFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3275 0000898D E983FDFFFF          <1> 	jmp	loc_file_rw_restore_retn
  3276                              <1> 
  3277                              <1> loc_rmdir_directory_not_empty:
  3278 00008992 BE[1A120100]        <1> 	mov	esi, Msg_Dir_Not_Empty
  3279 00008997 E831DAFFFF          <1> 	call	print_msg
  3280                              <1> 	; 01/03/2016
  3281 0000899C A1[A2600100]        <1> 	mov	eax, [FAT_ClusterCounter]
  3282 000089A1 09C0                <1> 	or	eax, eax ; 0 ?
  3283 000089A3 0F846CFDFFFF        <1> 	jz	loc_file_rw_restore_retn
  3284                              <1> 	; ESI = Logical DOS Drive Description Table address	
  3285 000089A9 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> use ESI for Drive parameters
  3286                              <1> 	           ; BL = 1 -> add free clusters
  3287 000089AD E896380000          <1> 	call	calculate_fat_freespace
  3288 000089B2 09C9                <1> 	or	ecx, ecx
  3289 000089B4 0F845BFDFFFF        <1>         jz      loc_file_rw_restore_retn ; ecx = 0 -> OK
  3290                              <1> 	; ecx > 0 -> Error (Recalculation is needed)
  3291 000089BA EBBE                <1> 	jmp	short loc_rmdir_cmd_return
  3292                              <1> 
  3293                              <1> 
  3294                              <1> delete_sub_directory:
  3295                              <1> 	; 29/12/2017 
  3296                              <1> 	; (moved here from 'delete_directory' for 'sysrmdir' )
  3297                              <1> 
  3298                              <1> 	; EDI = Directory buffer entry offset/address
  3299                              <1> 
  3300                              <1> loc_rmdir_delete_short_name_check_dir_empty:
  3301 000089BC 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
  3302 000089C0 C1E010              <1>         shl	eax, 16
  3303 000089C3 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
  3304                              <1> 
  3305                              <1> 	;mov 	[DelFile_FCluster], eax
  3306                              <1> 
  3307                              <1> 	;;mov	bx, [DirBuff_EntryCounter]
  3308                              <1> 	;mov	bx, [FindFile_DirEntryNumber] ; 27/02/2016
  3309                              <1> 	;mov	[DelFile_EntryCounter], bx
  3310                              <1> 
  3311 000089C7 29DB                <1>     	sub	ebx, ebx
  3312                              <1> 	; 29/12/2017
  3313 000089C9 891D[A2600100]      <1> 	mov	[FAT_ClusterCounter], ebx ; 0 ; Reset
  3314                              <1> 
  3315 000089CF 8A3D[26620100]      <1> 	mov	bh, [FindFile_Drv]
  3316 000089D5 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3317 000089DA 01DE                <1> 	add	esi, ebx
  3318                              <1> 
  3319 000089DC 66817F0CA101        <1> 	cmp	word [edi+DirEntry_NTRes], 01A1h
  3320 000089E2 745A                <1> 	je	short loc_rmdir_check_fs_directory
  3321                              <1> 
  3322                              <1> 	;cmp	byte [esi+LD_FATType], 1
  3323                              <1> 	;jb	short loc_rmdir_get__last_cluster_0
  3324                              <1> 
  3325                              <1> 	; 29/12/2017
  3326 000089E4 83F802              <1> 	cmp	eax, 2
  3327 000089E7 7306                <1> 	jnb	short loc_rmdir_get_last_cluster_1
  3328                              <1> 	; eax < 2
  3329                              <1> loc_rmdir_get_last_cluster_0:
  3330                              <1> 	;mov	eax, ERR_INV_FORMAT ; invalid format!
  3331 000089E9 B813000000          <1> 	mov	eax, ERR_NOT_DIR ; not a valid directory!
  3332                              <1> 	;stc
  3333 000089EE C3                  <1> 	retn
  3334                              <1> 
  3335                              <1> loc_rmdir_get_last_cluster_1:
  3336 000089EF 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3 ; FAT32
  3337 000089F3 750C                <1> 	jne	short loc_rmdir_get_last_cluster_2
  3338                              <1> 
  3339                              <1> 	; is it root directory ?
  3340 000089F5 3B4632              <1> 	cmp	eax, [esi+LD_BPB+BPB_RootClus]
  3341 000089F8 7507                <1> 	jne	short loc_rmdir_get_last_cluster_2
  3342                              <1> 
  3343                              <1> 	; root directory can not be deleted !!
  3344                              <1> loc_rmdir_permission_denied:
  3345 000089FA B80B000000          <1> 	mov	eax, ERR_PERM_DENIED ; permission denied!
  3346 000089FF F9                  <1> 	stc
  3347 00008A00 C3                  <1> 	retn		
  3348                              <1> 
  3349                              <1> loc_rmdir_get_last_cluster_2:
  3350                              <1> 	; 29/12/2017
  3351 00008A01 A3[E8620100]        <1> 	mov 	[DelFile_FCluster], eax
  3352                              <1> 	
  3353                              <1> 	;mov	dx, [DirBuff_EntryCounter]
  3354 00008A06 668B15[A0620100]    <1> 	mov	dx, [FindFile_DirEntryNumber] ; 27/02/2016
  3355 00008A0D 668915[EC620100]    <1> 	mov	[DelFile_EntryCounter], dx
  3356                              <1> 	
  3357 00008A14 8B15[B1600100]      <1> 	mov	edx, [DirBuff_Cluster]
  3358 00008A1A 8915[18630100]      <1> 	mov	[RmDir_ParentDirCluster], edx
  3359                              <1> 
  3360 00008A20 893D[14630100]      <1> 	mov	[RmDir_DirEntryOffset], edi
  3361                              <1> 
  3362                              <1> 	; 01/03/2016
  3363                              <1> 	;mov	dword [FAT_ClusterCounter], 0 ; Reset
  3364                              <1> 
  3365                              <1> loc_rmdir_get_last_cluster_3:
  3366 00008A26 E89C390000          <1> 	call	get_last_cluster
  3367                              <1>         ;jc	loc_rmdir_cmd_failed
  3368 00008A2B 721E                <1> 	jc	short loc_delete_sub_dir_retn ; 29/12/2017
  3369                              <1> 	
  3370 00008A2D 3B05[E8620100]      <1> 	cmp	eax, [DelFile_FCluster]
  3371 00008A33 7517                <1> 	jne	short loc_rmdir_multi_dir_clusters
  3372                              <1> 
  3373 00008A35 C605[13630100]00    <1> 	mov	byte [RmDir_MultiClusters], 0
  3374 00008A3C EB15                <1> 	jmp	short pass_rmdir_multi_dir_clusters
  3375                              <1> 
  3376                              <1> loc_rmdir_check_fs_directory:
  3377                              <1> 	; 29/12/2017
  3378 00008A3E 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  3379 00008A42 75B6                <1> 	jne	short loc_rmdir_permission_denied
  3380                              <1> 
  3381                              <1> loc_rmdir_delete_fs_directory:
  3382 00008A44 E876130000          <1> 	call	delete_fs_directory
  3383                              <1> 	;jnc	loc_print_deleted_message
  3384 00008A49 7300                <1> 	jnc	short loc_delete_sub_dir_retn ; 29/12/2017
  3385                              <1> 
  3386                              <1> 	; EAX=0 -> Directory not empty !
  3387                              <1> 	; EAX>0 -> Disk r/w error or another (misc) error
  3388                              <1> 	
  3389                              <1> 	;or	eax, eax
  3390                              <1> 	;jz	loc_rmdir_directory_not_empty_2         
  3391                              <1> 	;;stc
  3392                              <1> 	;;jmp	loc_file_rw_cmd_failed
  3393                              <1> 	
  3394                              <1> loc_delete_sub_dir_retn:
  3395 00008A4B C3                  <1> 	retn
  3396                              <1>  
  3397                              <1> loc_rmdir_multi_dir_clusters:
  3398 00008A4C C605[13630100]01    <1> 	mov	byte [RmDir_MultiClusters], 1
  3399                              <1> 
  3400                              <1> pass_rmdir_multi_dir_clusters:
  3401 00008A53 A3[1C630100]        <1> 	mov 	[RmDir_DirLastCluster], eax
  3402 00008A58 890D[20630100]      <1> 	mov	[RmDir_PreviousCluster], ecx
  3403                              <1> 
  3404                              <1> loc_rmdir_load_fat_sub_directory:
  3405 00008A5E E84F330000          <1> 	call	load_FAT_sub_directory
  3406                              <1> 	;jc	loc_rmdir_cmd_failed
  3407 00008A63 72E6                <1> 	jc	short loc_delete_sub_dir_retn
  3408                              <1> 
  3409                              <1> loc_rmdir_find_last_dir_entry:
  3410 00008A65 56                  <1> 	push	esi
  3411 00008A66 BE[0A620100]        <1> 	mov	esi, Dir_File_Name
  3412 00008A6B C6062A              <1> 	mov	byte [esi], '*'
  3413 00008A6E C646082A            <1> 	mov	byte [esi+8], '*'
  3414 00008A72 31DB                <1> 	xor	ebx, ebx ; Entry offset  = 0
  3415                              <1> loc_rmdir_find_last_dir_entry_next:
  3416 00008A74 66B80008            <1> 	mov	ax, 0800h ; Except volume/long names
  3417 00008A78 6631C9              <1> 	xor	cx, cx ; 0 = Find a valid file or dir name
  3418 00008A7B E87A170000          <1> 	call	find_directory_entry
  3419 00008A80 7225                <1> 	jc	short loc_rmdir_empty_dir_cluster
  3420 00008A82 83FB01              <1> 	cmp	ebx, 1
  3421 00008A85 771B                <1> 	ja	short loc_rmdir_directory_not_empty_1
  3422                              <1> loc_rmdir_dot_entry_check:
  3423 00008A87 80FD2E              <1> 	cmp	ch, '.' ; The first char of the dir entry
  3424 00008A8A 7516                <1> 	jne	short loc_rmdir_directory_not_empty_1
  3425 00008A8C 08DB                <1> 	or	bl, bl
  3426 00008A8E 7506                <1> 	jnz	short loc_rmdir_dotdot_entry_check
  3427 00008A90 807F0120            <1> 	cmp	byte [edi+1], 20h
  3428 00008A94 EB06                <1> 	jmp	short pass_rmdir_dot_entry_check
  3429                              <1> 
  3430                              <1> loc_rmdir_dotdot_entry_check:
  3431 00008A96 66817F012E20        <1> 	cmp	word [edi+1], '. '
  3432                              <1> pass_rmdir_dot_entry_check:	
  3433 00008A9C 7504                <1> 	jne	short loc_rmdir_directory_not_empty_1 
  3434 00008A9E FEC3                <1> 	inc	bl
  3435 00008AA0 EBD2                <1> 	jmp	short loc_rmdir_find_last_dir_entry_next 
  3436                              <1> 
  3437                              <1> loc_rmdir_directory_not_empty_1:
  3438 00008AA2 58                  <1> 	pop	eax ; pushed esi 
  3439 00008AA3 31C0                <1> 	xor	eax, eax ; 0
  3440                              <1> loc_rmdir_directory_not_empty_2:
  3441                              <1> loc_delete_sub_dir_stc_retn:
  3442 00008AA5 F9                  <1> 	stc
  3443 00008AA6 C3                  <1> 	retn
  3444                              <1> 
  3445                              <1> loc_rmdir_empty_dir_cluster:
  3446 00008AA7 5E                  <1> 	pop	esi
  3447                              <1> 
  3448                              <1> loc_rmdir_set_prev_cluster_dir_last_cluster:
  3449 00008AA8 803D[13630100]00    <1> 	cmp	byte [RmDir_MultiClusters], 0
  3450 00008AAF 7613                <1> 	jna	short loc_rmdir_unlink_dir_last_cluster
  3451                              <1> 
  3452 00008AB1 A1[20630100]        <1> 	mov	eax, [RmDir_PreviousCluster]
  3453                              <1> 	;xor	ecx, ecx
  3454 00008AB6 49                  <1> 	dec	ecx ; FFFFFFFFh
  3455 00008AB7 E83A340000          <1> 	call	update_cluster
  3456 00008ABC 7306                <1> 	jnc	short loc_rmdir_unlink_dir_last_cluster
  3457                              <1> 
  3458                              <1> 	; 01/03/2016
  3459                              <1> 	;cmp	eax, 1  ; eax = 0 -> end of cluster chain
  3460                              <1> 	;cmc 
  3461                              <1> 	;jc	short loc_rmdir_cmd_failed
  3462                              <1> 	;jmp	short loc_rmdir_save_fat_buffer
  3463                              <1> 	; 29/12/2017 
  3464 00008ABE 21C0                <1> 	and	eax, eax
  3465 00008AC0 75E3                <1> 	jnz	short loc_delete_sub_dir_stc_retn
  3466 00008AC2 EB12                <1> 	jmp	short loc_rmdir_save_fat_buffer	
  3467                              <1> 
  3468                              <1> loc_rmdir_unlink_dir_last_cluster:
  3469 00008AC4 A1[1C630100]        <1> 	mov	eax, [RmDir_DirLastCluster]
  3470 00008AC9 31C9                <1> 	xor	ecx, ecx ; 0
  3471 00008ACB E826340000          <1> 	call	update_cluster
  3472 00008AD0 7327                <1> 	jnc	short loc_rmdir_unlink_stc_retn_0Bh
  3473                              <1> 	; Because of it is the last cluster
  3474                              <1> 	; 'update_cluster' must return with eocc error 
  3475 00008AD2 09C0                <1> 	or	eax, eax
  3476                              <1> 	;jz	short loc_rmdir_save_fat_buffer ; eocc	
  3477                              <1> 	;stc
  3478                              <1>         ;jmp     short loc_rmdir_cmd_failed
  3479                              <1> 	; 29/12/2017
  3480 00008AD4 75CF                <1> 	jnz	short loc_delete_sub_dir_stc_retn
  3481                              <1> 	
  3482                              <1> loc_rmdir_save_fat_buffer:
  3483 00008AD6 803D[9A600100]02    <1> 	cmp	byte [FAT_BuffValidData], 2
  3484 00008ADD 7528                <1> 	jne	short loc_rmdir_calculate_FAT_freespace
  3485 00008ADF E8CF360000          <1> 	call	save_fat_buffer
  3486                              <1> 	;jc	short loc_rmdir_cmd_failed
  3487                              <1> 	; 29/12/2017
  3488 00008AE4 7219                <1> 	jc	short loc_rmdir_unlink_error_retn
  3489                              <1> 
  3490                              <1> 	; 01/03/2016
  3491 00008AE6 803D[13630100]00    <1> 	cmp	byte [RmDir_MultiClusters], 0
  3492 00008AED 7618                <1> 	jna	short loc_rmdir_calculate_FAT_freespace
  3493                              <1> 
  3494 00008AEF A1[E8620100]        <1> 	mov	eax, [DelFile_FCluster]
  3495 00008AF4 E92DFFFFFF          <1>         jmp     loc_rmdir_get_last_cluster_3
  3496                              <1> 
  3497                              <1> loc_rmdir_unlink_stc_retn_0Bh:
  3498                              <1> 	; 15/10/2016 (0Bh -> 28)
  3499 00008AF9 B81C000000          <1> 	mov	eax, ERR_INV_FORMAT ; 28 = Invalid format
  3500                              <1> loc_rmdir_unlink_stc_retn:
  3501 00008AFE F9                  <1> 	stc
  3502                              <1> loc_rmdir_unlink_error_retn:
  3503 00008AFF C3                  <1> 	retn
  3504                              <1> 
  3505                              <1> loc_rmdir_delete_short_name_invalid_data:
  3506 00008B00 B81D000000          <1> 	mov	eax, 29 ; Invalid data (15/10/2016)
  3507                              <1> 	;stc
  3508                              <1>         ;jmp	loc_rmdir_cmd_failed
  3509                              <1> 	; 29/12/2017
  3510 00008B05 EBF7                <1> 	jmp	short loc_rmdir_unlink_stc_retn
  3511                              <1> 
  3512                              <1> loc_rmdir_calculate_FAT_freespace:
  3513                              <1> 	;mov	eax, [FAT_ClusterCounter]
  3514                              <1> 	; 29/12/2017
  3515 00008B07 29C0                <1> 	sub	eax, eax ; 0
  3516 00008B09 8705[A2600100]      <1> 	xchg	eax, [FAT_ClusterCounter]
  3517                              <1> 	;
  3518 00008B0F 66BB01FF            <1> 	mov	bx, 0FF01h
  3519                              <1> 	; BL = 1 -> Add EAX to free space count
  3520                              <1> 	; BH = FFh ->
  3521                              <1> 	; ESI = Logical DOS Drive Description Table address
  3522 00008B13 E830370000          <1> 	call	calculate_fat_freespace
  3523                              <1> 
  3524 00008B18 21C9                <1> 	and	ecx, ecx ; ecx = 0 -> valid free sector count
  3525 00008B1A 7409                <1> 	jz 	short loc_rmdir_delete_short_name_continue
  3526                              <1> 
  3527                              <1> loc_rmdir_recalculate_FAT_freespace:
  3528 00008B1C 66BB00FF            <1>         mov     bx, 0FF00h ; BL = 0 -> Recalculate free space
  3529 00008B20 E823370000          <1> 	call	calculate_fat_freespace
  3530                              <1> 	          
  3531                              <1> loc_rmdir_delete_short_name_continue:
  3532 00008B25 A1[18630100]        <1> 	mov	eax, [RmDir_ParentDirCluster]
  3533 00008B2A 83F802              <1> 	cmp	eax, 2
  3534 00008B2D 7309                <1> 	jnb	short loc_rmdir_del_short_name_load_sub_dir
  3535 00008B2F E8F3310000          <1> 	call	load_FAT_root_directory
  3536                              <1> 	;jc	loc_file_rw_cmd_failed
  3537                              <1> 	; 29/12/2017
  3538 00008B34 72C9                <1> 	jc	short loc_rmdir_unlink_error_retn
  3539 00008B36 EB07                <1> 	jmp	short loc_rmdir_del_short_name_ld_chk_fclust
  3540                              <1> 
  3541                              <1> loc_rmdir_del_short_name_load_sub_dir:	
  3542 00008B38 E875320000          <1> 	call	load_FAT_sub_directory
  3543                              <1> 	;jc	loc_file_rw_cmd_failed
  3544                              <1> 	; 29/12/2017
  3545 00008B3D 72C0                <1> 	jc	short loc_rmdir_unlink_error_retn
  3546                              <1> 
  3547                              <1> loc_rmdir_del_short_name_ld_chk_fclust:
  3548 00008B3F 0FB73D[14630100]    <1> 	movzx	edi, word [RmDir_DirEntryOffset]
  3549 00008B46 81C700000800        <1> 	add	edi, Directory_Buffer
  3550                              <1> 
  3551 00008B4C 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
  3552 00008B50 C1E010              <1> 	shl	eax, 16
  3553 00008B53 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
  3554                              <1>         ; Not necessary... 
  3555 00008B57 3B05[E8620100]      <1> 	cmp	eax, [DelFile_FCluster]
  3556 00008B5D 75A1                <1> 	jne	short loc_rmdir_delete_short_name_invalid_data
  3557                              <1> 	;
  3558 00008B5F C607E5              <1> 	mov	byte [edi], 0E5h ; 'Deleted' sign
  3559                              <1> 	; 27/02/2016
  3560                              <1> 	; TRDOS v1 has a bug here! it does not set
  3561                              <1> 	; 'DirBuff_ValidData' to 2; as result of this bug,
  3562                              <1> 	; 'save_directory_buffer' would not save the change ! 
  3563 00008B62 C605[AC600100]02    <1>   	mov	byte [DirBuff_ValidData], 2 ; change sign
  3564                              <1> 	;
  3565 00008B69 E8AE1D0000          <1> 	call	save_directory_buffer
  3566                              <1> 	;jc	loc_file_rw_cmd_failed
  3567                              <1> 	; 29/12/2017
  3568 00008B6E 728F                <1> 	jc	short loc_rmdir_unlink_error_retn
  3569                              <1> 
  3570                              <1> loc_rmdir_del_long_name:
  3571 00008B70 0FB615[EE620100]    <1> 	movzx	edx, byte [DelFile_LNEL]
  3572 00008B77 08D2                <1> 	or	dl, dl
  3573 00008B79 7410                <1> 	jz	short loc_rmdir_update_parent_dir_lmdt
  3574                              <1>              
  3575 00008B7B 0FB705[EC620100]    <1> 	movzx	eax, word [DelFile_EntryCounter]
  3576 00008B82 29D0                <1> 	sub	eax, edx
  3577                              <1> 	; 29/12/2017
  3578 00008B84 7205                <1> 	jc	short loc_rmdir_update_parent_dir_lmdt
  3579                              <1>  
  3580                              <1>  	; EAX = Directory Entry Number of the long name last entry
  3581 00008B86 E8EF1E0000          <1> 	call	delete_longname
  3582                              <1> 
  3583                              <1> loc_rmdir_update_parent_dir_lmdt:
  3584 00008B8B E8271E0000          <1> 	call	update_parent_dir_lmdt
  3585                              <1> 	;jc	short loc_file_rw_cmd_failed
  3586                              <1> 	; 29/12/2017
  3587                              <1> 	;jc	short loc_rmdir_unlink_error_retn
  3588                              <1> 
  3589                              <1> loc_delete_sub_directory_ok:
  3590                              <1> 	; 29/12/2017
  3591 00008B90 31C0                <1> 	xor	eax, eax ;  0 ;  cf = 0
  3592 00008B92 C3                  <1> 	retn
  3593                              <1> 
  3594                              <1> 
  3595                              <1> delete_file:
  3596                              <1> 	; 29/02/2016
  3597                              <1> 	; 28/02/2016 (TRDOS 386 = TRDOS v2.0)
  3598                              <1> 	; 09/08/2010 (CMD_INTR.ASM, 'cmp_cmd_del')
  3599                              <1> 	; 28/02/2010
  3600                              <1> 
  3601                              <1> get_delfile_fchar:
  3602                              <1> 	; esi = file name
  3603 00008B93 803E20              <1> 	cmp	byte [esi], 20h
  3604 00008B96 7701                <1>         ja	short loc_delfile_parse_path_name
  3605                              <1> 
  3606                              <1> loc_delfile_nofilename_retn:
  3607 00008B98 C3                  <1> 	retn
  3608                              <1> 
  3609                              <1> loc_delfile_parse_path_name:
  3610 00008B99 BF[26620100]        <1> 	mov	edi, FindFile_Drv
  3611 00008B9E E815190000          <1> 	call	parse_path_name
  3612 00008BA3 0F822EF2FFFF        <1> 	jc	loc_cmd_failed
  3613                              <1> 
  3614                              <1> loc_delfile_check_filename_exists:
  3615 00008BA9 BE[68620100]        <1> 	mov	esi, FindFile_Name
  3616 00008BAE 803E20              <1> 	cmp	byte [esi], 20h
  3617 00008BB1 0F8620F2FFFF        <1> 	jna	loc_cmd_failed
  3618 00008BB7 8935[E4620100]      <1> 	mov	[DelFile_FNPointer], esi 
  3619                              <1> 
  3620                              <1> loc_delfile_drv:
  3621 00008BBD 8A15[26620100]      <1> 	mov	dl, [FindFile_Drv]
  3622 00008BC3 8A35[86590100]      <1> 	mov	dh, [Current_Drv]
  3623 00008BC9 8835[E2600100]      <1> 	mov	[RUN_CDRV], dh
  3624 00008BCF 38F2                <1> 	cmp	dl, dh
  3625 00008BD1 740B                <1> 	je	short loc_delfile_change_directory
  3626                              <1> 
  3627 00008BD3 E86CE3FFFF          <1> 	call	change_current_drive
  3628 00008BD8 0F8237FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3629                              <1> 
  3630                              <1> loc_delfile_change_directory:
  3631 00008BDE 803D[27620100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  3632 00008BE5 7618                <1> 	jna	short loc_delfile_find
  3633                              <1> 
  3634 00008BE7 FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  3635 00008BED BE[27620100]        <1> 	mov	esi, FindFile_Directory
  3636 00008BF2 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3637 00008BF4 E8A9120000          <1> 	call	change_current_directory
  3638 00008BF9 0F8216FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3639                              <1> 
  3640                              <1> ;loc_delfile_change_prompt_dir_string:
  3641                              <1> 	;call	change_prompt_dir_string
  3642                              <1> 
  3643                              <1> loc_delfile_find:
  3644                              <1> 	;mov	esi, FindFile_Name
  3645 00008BFF 8B35[E4620100]      <1> 	mov	esi, [DelFile_FNPointer]
  3646 00008C05 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  3647 00008C09 E8D9F6FFFF          <1> 	call	find_first_file
  3648 00008C0E 0F8201FBFFFF        <1> 	jc	loc_file_rw_cmd_failed
  3649                              <1> 
  3650                              <1> loc_delfile_ambgfn_check:
  3651 00008C14 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3652 00008C17 740B                <1> 	jz	short loc_delfile_found
  3653                              <1> 
  3654                              <1> loc_file_not_found:
  3655 00008C19 B802000000          <1> 	mov	eax, 2 ; File not found sign
  3656 00008C1E F9                  <1> 	stc
  3657 00008C1F E9F1FAFFFF          <1> 	jmp	loc_file_rw_cmd_failed   
  3658                              <1> 
  3659                              <1> loc_delfile_found:
  3660 00008C24 80E307              <1> 	and	bl, 07h ; Attributes
  3661 00008C27 0F85F2FAFFFF        <1>         jnz     loc_permission_denied
  3662                              <1> 
  3663                              <1> ;loc_delfile_found_save_lnel:
  3664                              <1> ;	mov	[DelFile_LNEL], bh ; Long name entry length (if > 0)
  3665                              <1> 
  3666                              <1> loc_delfile_ask_for_delete:
  3667 00008C2D 57                  <1> 	push	edi ; * (29/02/2016)
  3668                              <1> 
  3669 00008C2E BE[31120100]        <1> 	mov	esi, Msg_DoYouWantDelete
  3670 00008C33 E895D7FFFF          <1> 	call	print_msg
  3671 00008C38 8B35[E4620100]      <1> 	mov	esi, [DelFile_FNPointer]
  3672 00008C3E E88AD7FFFF          <1> 	call	print_msg
  3673 00008C43 BE[E5110100]        <1> 	mov	esi, Msg_YesNo
  3674 00008C48 E880D7FFFF          <1> 	call	print_msg
  3675                              <1> 
  3676                              <1> loc_delfile_ask_again:
  3677 00008C4D 30E4                <1> 	xor	ah, ah
  3678 00008C4F E8CB7FFFFF          <1> 	call	int16h
  3679 00008C54 3C1B                <1> 	cmp	al, 1Bh
  3680                              <1> 	;je	short loc_do_not_delete_file
  3681 00008C56 7449                <1> 	je	short loc_delfile_y_n_escape ; 06/03/2016
  3682 00008C58 24DF                <1> 	and	al, 0DFh
  3683 00008C5A A2[EF110100]        <1> 	mov	[Y_N_nextline], al
  3684 00008C5F 3C59                <1> 	cmp	al, 'Y'
  3685 00008C61 7404                <1> 	je	short loc_yes_delete_file
  3686 00008C63 3C4E                <1> 	cmp	al, 'N'
  3687 00008C65 75E6                <1> 	jne	short loc_delfile_ask_again
  3688                              <1> 
  3689                              <1> loc_do_not_delete_file:
  3690                              <1> loc_yes_delete_file:
  3691 00008C67 E8E2FBFFFF          <1> 	call	y_n_answer ; 29/12/2017
  3692 00008C6C 5F                  <1> 	pop	edi ; * (29/02/2016)
  3693                              <1> 	;cmp	al, 'Y' ; 'yes'
  3694                              <1> 	;cmc
  3695                              <1>         ;jnc	loc_file_rw_restore_retn
  3696 00008C6D 3C4E                <1> 	cmp	al, 'N' ; 'no'
  3697 00008C6F 0F84A0FAFFFF        <1>         je	loc_file_rw_restore_retn  
  3698                              <1> 
  3699                              <1> loc_delete_file:
  3700 00008C75 8A3D[26620100]      <1> 	mov	bh, [FindFile_Drv]
  3701                              <1> 	;mov	bl, [DelFile_LNEL]
  3702 00008C7B 8A1D[75620100]      <1> 	mov	bl, [FindFile_LongNameEntryLength]
  3703                              <1> 	;mov	cx, [DirBuff_EntryCounter]
  3704 00008C81 668B0D[A0620100]    <1> 	mov	cx, [FindFile_DirEntryNumber]
  3705                              <1> 	; (*) EDI = Directory buffer entry offset/address 
  3706 00008C88 E8D71F0000          <1> 	call	remove_file ; (FILE.ASM, 'proc_delete_file')
  3707 00008C8D 0F8378FAFFFF        <1> 	jnc	loc_print_deleted_message
  3708                              <1> 
  3709                              <1> 	;cmp	al, 05h
  3710 00008C93 3C0B                <1> 	cmp	al, ERR_PERM_DENIED  ; 29/12/2017 (5 -> 11)
  3711 00008C95 0F8484FAFFFF        <1> 	je	loc_permission_denied
  3712 00008C9B F9                  <1> 	stc
  3713 00008C9C E974FAFFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3714                              <1> 
  3715                              <1> loc_delfile_y_n_escape:
  3716 00008CA1 B04E                <1> 	mov	al, 'N' ; 'no'
  3717 00008CA3 EBC2                <1> 	jmp	short loc_do_not_delete_file
  3718                              <1> 
  3719                              <1> set_file_attributes:
  3720                              <1> 	; 06/03/2016
  3721                              <1> 	; 04/03/2016 (TRDOS 386 = TRDOS v2.0)
  3722                              <1> 	; 10/07/2010 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_attrib')
  3723                              <1> 	; 23/05/2010 
  3724                              <1> 	; 17/12/2000 (P2000.ASM)
  3725                              <1> 
  3726                              <1> 	; esi = file or directory name
  3727 00008CA5 6631C0              <1> 	xor	ax, ax
  3728 00008CA8 66A3[82120100]      <1> 	mov	[Attr_Chars], ax
  3729 00008CAE A2[3C630100]        <1> 	mov	[Attributes], al
  3730                              <1> 
  3731                              <1> get_attrib_fchar:
  3732                              <1> 	; esi = file name
  3733 00008CB3 8A06                <1> 	mov	al, [esi]
  3734 00008CB5 3C20                <1> 	cmp	al, 20h
  3735 00008CB7 7623                <1> 	jna	short loc_attr_file_nofilename_retn
  3736                              <1> 
  3737                              <1> loc_scan_attrib_params:
  3738 00008CB9 3C2D                <1> 	cmp	al, '-'
  3739 00008CBB 0F871C010000        <1> 	ja	loc_attr_file_parse_path_name
  3740 00008CC1 7408                <1> 	je	short loc_attr_space
  3741                              <1> 
  3742 00008CC3 3C2B                <1> 	cmp	al, '+'
  3743 00008CC5 0F850CF1FFFF        <1> 	jne	loc_cmd_failed
  3744                              <1> 
  3745                              <1> loc_attr_space:
  3746 00008CCB 8A6601              <1> 	mov	ah, [esi+1]
  3747 00008CCE 80FC20              <1>  	cmp	ah, 20h
  3748 00008CD1 770A                <1> 	ja	short pass_attr_space
  3749 00008CD3 0F82FEF0FFFF        <1> 	jb	loc_cmd_failed
  3750 00008CD9 46                  <1> 	inc	esi
  3751 00008CDA EBEF                <1> 	jmp	short loc_attr_space
  3752                              <1> 
  3753                              <1> loc_attr_file_nofilename_retn:
  3754 00008CDC C3                  <1> 	retn
  3755                              <1> 
  3756                              <1> pass_attr_space:
  3757 00008CDD 80E4DF              <1> 	and	ah, 0DFh
  3758 00008CE0 80FC53              <1> 	cmp	ah, 'S'
  3759 00008CE3 0F87EEF0FFFF        <1> 	ja	loc_cmd_failed
  3760 00008CE9 7204                <1> 	jb	short pass_attr_system
  3761 00008CEB B404                <1> 	mov	ah, 04h   ; System
  3762 00008CED EB21                <1> 	jmp	short pass_attr_archive
  3763                              <1> 
  3764                              <1> pass_attr_system:
  3765 00008CEF 80FC48              <1> 	cmp	ah, 'H'
  3766 00008CF2 7706                <1> 	ja	short pass_attr_hidden
  3767 00008CF4 7213                <1> 	jb	short pass_attr_read_only
  3768 00008CF6 B402                <1> 	mov	ah, 02h    ; Hidden
  3769 00008CF8 EB16                <1> 	jmp	short pass_attr_archive
  3770                              <1> 
  3771                              <1> pass_attr_hidden:
  3772 00008CFA 80FC52              <1> 	cmp	ah, 'R'
  3773 00008CFD 0F87D4F0FFFF        <1> 	ja	loc_cmd_failed
  3774 00008D03 7204                <1> 	jb	short pass_attr_read_only ; Read only
  3775 00008D05 B401                <1> 	mov	ah, 01h
  3776 00008D07 EB07                <1> 	jmp	short pass_attr_archive
  3777                              <1> 
  3778                              <1> pass_attr_read_only:
  3779 00008D09 80FC41              <1> 	cmp	ah, 'A'
  3780 00008D0C 753B                <1> 	jne	short loc_chk_attr_enter
  3781 00008D0E B420                <1> 	mov	ah, 20h    ; Archive
  3782                              <1> 
  3783                              <1> pass_attr_archive:
  3784 00008D10 3C2D                <1> 	cmp	al, '-'
  3785 00008D12 7508                <1> 	jne	short pass_reducing_attributes
  3786 00008D14 0825[82120100]      <1> 	or	[Attr_Chars], ah
  3787 00008D1A EB06                <1> 	jmp	short loc_change_attributes_inc
  3788                              <1> 
  3789                              <1> pass_reducing_attributes:
  3790 00008D1C 0825[83120100]      <1> 	or	[Attr_Chars+1], ah
  3791                              <1> 
  3792                              <1> loc_change_attributes_inc:
  3793 00008D22 46                  <1> 	inc	esi
  3794 00008D23 8A6601              <1> 	mov	ah, [esi+1]
  3795 00008D26 80FC20              <1> 	cmp	ah, 20h
  3796 00008D29 7227                <1> 	jb	short pass_change_attr
  3797 00008D2B 74F5                <1> 	je	short loc_change_attributes_inc
  3798 00008D2D 80FC2D              <1> 	cmp	ah, '-'
  3799 00008D30 770D                <1> 	ja	short loc_chk_next_attr_char1
  3800 00008D32 7405                <1> 	je	short loc_chk_next_attr_char0
  3801 00008D34 80FC2B              <1> 	cmp	ah, '+'
  3802 00008D37 7506                <1> 	jne	short loc_chk_next_attr_char1
  3803                              <1> 
  3804                              <1> loc_chk_next_attr_char0:
  3805 00008D39 46                  <1> 	inc	esi
  3806 00008D3A 668B06              <1> 	mov	ax, [esi]
  3807 00008D3D EB9E                <1> 	jmp	short pass_attr_space
  3808                              <1> 
  3809                              <1> loc_chk_next_attr_char1:
  3810 00008D3F 803E2D              <1> 	cmp	byte [esi], '-'
  3811 00008D42 7799                <1> 	ja	short pass_attr_space
  3812 00008D44 E988000000          <1>         jmp     loc_attr_file_check_fname_fchar
  3813                              <1> 
  3814                              <1> loc_chk_attr_enter:
  3815 00008D49 80FC0D              <1> 	cmp	ah, 0Dh
  3816 00008D4C 0F8585F0FFFF        <1> 	jne	loc_cmd_failed
  3817                              <1> 
  3818                              <1> pass_change_attr:
  3819 00008D52 A0[82120100]        <1> 	mov	al, [Attr_Chars]
  3820 00008D57 F6D0                <1> 	not	al
  3821 00008D59 2005[3C630100]      <1> 	and	[Attributes], al
  3822 00008D5F A0[83120100]        <1> 	mov	al, [Attr_Chars+1]
  3823 00008D64 0805[3C630100]      <1> 	or	[Attributes], al
  3824                              <1> 
  3825                              <1> loc_show_attributes:
  3826 00008D6A BE[FF190100]        <1> 	mov	esi, nextline
  3827 00008D6F E859D6FFFF          <1> 	call	print_msg
  3828                              <1> 
  3829                              <1> loc_show_attributes_no_nextline:
  3830 00008D74 C705[82120100]4E4F- <1> 	mov	dword [Attr_Chars], 'NORM'
  3830 00008D7C 524D                <1>
  3831 00008D7E 66C705[86120100]41- <1> 	mov	word [Attr_Chars+4], 'AL'
  3831 00008D86 4C                  <1>
  3832 00008D87 BE[82120100]        <1> 	mov	esi, Attr_Chars
  3833 00008D8C A0[3C630100]        <1> 	mov	al, [Attributes]
  3834 00008D91 A804                <1> 	test	al, 04h
  3835 00008D93 7406                <1> 	jz	short pass_put_attr_s
  3836 00008D95 66C7065300          <1> 	mov	word [esi], 0053h     ; S
  3837 00008D9A 46                  <1> 	inc	esi
  3838                              <1> 
  3839                              <1> pass_put_attr_s:
  3840 00008D9B A802                <1> 	test	al, 02h
  3841 00008D9D 7406                <1> 	jz	short pass_put_attr_h
  3842 00008D9F 66C7064800          <1> 	mov	word [esi], 0048h     ; H
  3843 00008DA4 46                  <1> 	inc	esi
  3844                              <1> 
  3845                              <1> pass_put_attr_h:
  3846 00008DA5 A801                <1> 	test	al, 01h
  3847 00008DA7 7406                <1> 	jz	short pass_put_attr_r
  3848 00008DA9 66C7065200          <1> 	mov	word [esi], 0052h     ; R
  3849 00008DAE 46                  <1> 	inc	esi
  3850                              <1> 
  3851                              <1> pass_put_attr_r:
  3852 00008DAF 3C20                <1> 	cmp	al, 20h
  3853 00008DB1 7205                <1> 	jb	short pass_put_attr_a
  3854 00008DB3 66C7064100          <1> 	mov	word [esi], 0041h     ; A
  3855                              <1> 
  3856                              <1> pass_put_attr_a:
  3857 00008DB8 BE[75120100]        <1> 	mov	esi, Str_Attributes
  3858 00008DBD E80BD6FFFF          <1> 	call	print_msg
  3859 00008DC2 BE[FF190100]        <1> 	mov	esi, nextline
  3860 00008DC7 E801D6FFFF          <1> 	call	print_msg
  3861 00008DCC E944F9FFFF          <1> 	jmp	loc_file_rw_restore_retn 
  3862                              <1> 
  3863                              <1> loc_attr_file_check_fname_fchar:
  3864 00008DD1 46                  <1> 	inc	esi
  3865 00008DD2 803E20              <1> 	cmp	byte [esi], 20h
  3866 00008DD5 74FA                <1> 	je	short loc_attr_file_check_fname_fchar
  3867 00008DD7 0F8275FFFFFF        <1>         jb      pass_change_attr
  3868                              <1> 		   
  3869                              <1> loc_attr_file_parse_path_name:
  3870 00008DDD BF[26620100]        <1> 	mov	edi, FindFile_Drv
  3871 00008DE2 E8D1160000          <1> 	call	parse_path_name
  3872 00008DE7 0F82EAEFFFFF        <1> 	jc	loc_cmd_failed
  3873                              <1> 
  3874                              <1> loc_attr_file_check_filename_exists:
  3875 00008DED BE[68620100]        <1> 	mov	esi, FindFile_Name
  3876 00008DF2 803E20              <1> 	cmp	byte [esi], 20h
  3877 00008DF5 0F86DCEFFFFF        <1> 	jna	loc_cmd_failed
  3878 00008DFB 8935[E4620100]      <1> 	mov	[DelFile_FNPointer], esi 
  3879                              <1> 
  3880                              <1> loc_attr_file_drv:
  3881 00008E01 8A35[86590100]      <1> 	mov	dh, [Current_Drv]
  3882 00008E07 8835[E2600100]      <1> 	mov	[RUN_CDRV], dh
  3883                              <1> 
  3884 00008E0D 8A15[26620100]      <1> 	mov	dl, [FindFile_Drv]
  3885 00008E13 38F2                <1> 	cmp	dl, dh
  3886 00008E15 740B                <1> 	je	short loc_attr_file_change_directory
  3887                              <1> 
  3888 00008E17 E828E1FFFF          <1> 	call	change_current_drive
  3889 00008E1C 0F82F3F8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3890                              <1> 
  3891                              <1> loc_attr_file_change_directory:
  3892 00008E22 803D[27620100]20    <1>         cmp     byte [FindFile_Directory], 20h
  3893 00008E29 7618                <1> 	jna	short loc_attr_file_find
  3894                              <1> 
  3895 00008E2B FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  3896                              <1> 	
  3897 00008E31 BE[27620100]        <1> 	mov	esi, FindFile_Directory
  3898 00008E36 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3899 00008E38 E865100000          <1> 	call	change_current_directory
  3900 00008E3D 0F82D2F8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3901                              <1> 
  3902                              <1> ;loc_attr_file_change_prompt_dir_string:
  3903                              <1> 	;call	change_prompt_dir_string
  3904                              <1> 
  3905                              <1> loc_attr_file_find:
  3906                              <1> 	;mov	esi, FindFile_Name
  3907 00008E43 8B35[E4620100]      <1> 	mov	esi, [DelFile_FNPointer]
  3908 00008E49 66B80008            <1> 	mov	ax, 0800h ; Except volume labels
  3909 00008E4D E895F4FFFF          <1> 	call	find_first_file
  3910 00008E52 0F82BDF8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3911                              <1> 
  3912                              <1> loc_attr_file_ambgfn_check:
  3913 00008E58 6609D2              <1> 	or	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3914                              <1> 	;	(Note: It was BX in TRDOS v1)
  3915                              <1> 	;jz	short loc_attr_file_found
  3916 00008E5B 0F85B8FDFFFF        <1>         jnz     loc_file_not_found ; 06/03/2016 
  3917                              <1> 
  3918                              <1> 	;mov	eax, 2 ; File not found sign
  3919                              <1> 	;stc
  3920                              <1> 	;jmp	loc_file_rw_cmd_failed   
  3921                              <1> 
  3922                              <1> loc_attr_file_found:
  3923                              <1> 	; EDI = Directory buffer entry offset/address
  3924                              <1> 	; BL = File (or Directory) Attributes 
  3925                              <1> 	;	(Note: It was 'CL' in TRDOS v1)
  3926                              <1> 	; mov	bl, [EDI+0Bh]
  3927                              <1> 	
  3928 00008E61 66833D[82120100]00  <1> 	cmp	word [Attr_Chars], 0
  3929 00008E69 770B                <1> 	ja	short loc_attr_file_change_attributes
  3930 00008E6B 881D[3C630100]      <1> 	mov	[Attributes], bl
  3931 00008E71 E9F4FEFFFF          <1> 	jmp	loc_show_attributes
  3932                              <1> 
  3933                              <1> loc_attr_file_change_attributes:
  3934 00008E76 A0[82120100]        <1> 	mov	al, [Attr_Chars]
  3935 00008E7B F6D0                <1> 	not	al
  3936 00008E7D 20C3                <1> 	and	bl, al
  3937 00008E7F A0[83120100]        <1> 	mov	al, [Attr_Chars+1]
  3938 00008E84 08C3                <1> 	or	bl, al
  3939                              <1> 
  3940 00008E86 66817F0CA101        <1> 	cmp	word [edi+DirEntry_NTRes], 01A1h ; Singlix FS
  3941 00008E8C 741D                <1> 	je	short loc_attr_file_fs_check
  3942                              <1> 
  3943 00008E8E 881D[3C630100]      <1> 	mov	[Attributes], bl
  3944 00008E94 885F0B              <1> 	mov	[edi+0Bh], bl    ; Attributes (New!)
  3945                              <1> 
  3946                              <1> 	; 04/03/2016
  3947                              <1> 	; TRDOS v1 has a bug here! it does not set
  3948                              <1> 	; 'DirBuff_ValidData' to 2; as result of this bug,
  3949                              <1> 	; 'save_directory_buffer' would not save the new attributes ! 
  3950                              <1> 	
  3951 00008E97 C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  3952                              <1> 
  3953 00008E9E E8791A0000          <1> 	call 	save_directory_buffer
  3954 00008EA3 0F826CF8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3955                              <1> 
  3956 00008EA9 EB33                <1> 	jmp	short loc_print_attr_changed_message
  3957                              <1> 
  3958                              <1> loc_attr_file_fs_check:
  3959 00008EAB 29C0                <1> 	sub	eax, eax
  3960 00008EAD 8A25[AA600100]      <1>         mov     ah, [DirBuff_DRV]
  3961 00008EB3 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3962 00008EB8 01C6                <1>         add     esi, eax
  3963 00008EBA 807E04A1            <1>         cmp     byte [esi+LD_FSType], 0A1h
  3964 00008EBE 7309                <1> 	jnc	short loc_attr_file_change_fs_file_attributes
  3965                              <1> 	; 29/12/2017 (0Dh -> 29)	
  3966 00008EC0 66B81D00            <1> 	mov	ax, 29 ; Invalid Data
  3967 00008EC4 E94CF8FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  3968                              <1> 
  3969                              <1> loc_attr_file_change_fs_file_attributes:
  3970                              <1> 	; BL = New MS-DOS File Attributes
  3971 00008EC9 88D8                <1> 	mov	al, bl ; File/Directory Attributes
  3972 00008ECB 30E4                <1> 	xor	ah, ah ; Attributes in MS-DOS format sign	  
  3973 00008ECD E873050000          <1> 	call	change_fs_file_attributes
  3974 00008ED2 0F823DF8FFFF        <1> 	jc	loc_file_rw_cmd_failed
  3975                              <1> 
  3976 00008ED8 881D[3C630100]      <1> 	mov	[Attributes], bl 
  3977                              <1> 
  3978                              <1> loc_print_attr_changed_message:
  3979 00008EDE BE[70120100]        <1> 	mov	esi, Msg_New
  3980 00008EE3 E8E5D4FFFF          <1> 	call	print_msg
  3981 00008EE8 E987FEFFFF          <1> 	jmp	loc_show_attributes_no_nextline
  3982                              <1> 
  3983                              <1> rename_file:
  3984                              <1> 	; 13/11/2017
  3985                              <1> 	; 06/11/2016
  3986                              <1> 	; 05/11/2016
  3987                              <1> 	; 16/10/2016
  3988                              <1> 	; 08/03/2016
  3989                              <1> 	; 06/03/2016 (TRDOS 386 = TRDOS v2.0)
  3990                              <1> 	; 20/11/2010 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_rename')
  3991                              <1> 	; 16/11/2010 
  3992                              <1> 
  3993                              <1> get_rename_source_fchar:
  3994                              <1> 	; esi = file name
  3995 00008EED 803E20              <1> 	cmp	byte [esi], 20h
  3996 00008EF0 7614                <1>         jna	short loc_rename_nofilename_retn
  3997                              <1> 
  3998 00008EF2 8935[64630100]      <1> 	mov	[SourceFilePath], esi
  3999                              <1> 
  4000                              <1> rename_scan_source_file:
  4001 00008EF8 46                  <1> 	inc	esi
  4002 00008EF9 803E20              <1> 	cmp	byte [esi], 20h
  4003 00008EFC 7409                <1> 	je	short rename_scan_destination_file_1
  4004                              <1> 	;jb	short loc_rename_nofilename_retn
  4005 00008EFE 0F82D3EEFFFF        <1> 	jb	loc_cmd_failed
  4006 00008F04 EBF2                <1> 	jmp	short rename_scan_source_file
  4007                              <1> 
  4008                              <1> loc_rename_nofilename_retn: ; 08/03/2016
  4009 00008F06 C3                  <1> 	retn
  4010                              <1> 
  4011                              <1> rename_scan_destination_file_1:
  4012 00008F07 C60600              <1> 	mov	byte [esi], 0
  4013                              <1> 
  4014                              <1> rename_scan_destination_file_2:
  4015 00008F0A 46                  <1> 	inc	esi  
  4016 00008F0B 803E20              <1> 	cmp	byte [esi], 20h
  4017 00008F0E 74FA                <1> 	je	short rename_scan_destination_file_2
  4018                              <1> 	;jb	short loc_rename_nofilename_retn
  4019 00008F10 0F82C1EEFFFF        <1> 	jb	loc_cmd_failed
  4020                              <1> 
  4021 00008F16 8935[68630100]      <1> 	mov	[DestinationFilePath], esi
  4022                              <1> 
  4023                              <1> rename_scan_destination_file_3:
  4024 00008F1C 46                  <1> 	inc	esi  
  4025 00008F1D 803E20              <1> 	cmp	byte [esi], 20h
  4026 00008F20 77FA                <1> 	ja	short rename_scan_destination_file_3
  4027                              <1> 
  4028 00008F22 C60600              <1> 	mov	byte [esi], 0
  4029                              <1> 
  4030                              <1> loc_rename_save_current_drive:
  4031 00008F25 8A35[86590100]      <1> 	mov	dh, [Current_Drv]
  4032 00008F2B 8835[E2600100]      <1> 	mov	byte [RUN_CDRV], dh
  4033                              <1> 
  4034                              <1> loc_rename_sf_parse_path_name:
  4035 00008F31 8B35[64630100]      <1> 	mov	esi, [SourceFilePath] 
  4036 00008F37 BF[26620100]        <1> 	mov	edi, FindFile_Drv
  4037 00008F3C E877150000          <1> 	call	parse_path_name
  4038 00008F41 0F8290EEFFFF        <1> 	jc	loc_cmd_failed
  4039                              <1> 
  4040                              <1> loc_rename_sf_check_filename_exists:
  4041 00008F47 BE[68620100]        <1> 	mov	esi, FindFile_Name
  4042 00008F4C 803E20              <1> 	cmp	byte [esi], 20h
  4043 00008F4F 0F8682EEFFFF        <1> 	jna	loc_cmd_failed
  4044                              <1> 
  4045                              <1> 	;mov	[DelFile_FNPointer], esi 
  4046                              <1> 
  4047                              <1> loc_rename_sf_drv:
  4048                              <1> 	;mov	dh, [Current_Drv]
  4049                              <1> 	;mov	[RUN_CDRV], dh
  4050                              <1> 
  4051 00008F55 8A15[26620100]      <1> 	mov	dl, [FindFile_Drv]
  4052 00008F5B 38F2                <1> 	cmp	dl, dh ; dh = [Current_Drv]
  4053 00008F5D 740B                <1> 	je	short rename_sf_change_directory
  4054                              <1> 
  4055 00008F5F E8E0DFFFFF          <1> 	call	change_current_drive
  4056 00008F64 0F82ABF7FFFF        <1> 	jc	loc_file_rw_cmd_failed
  4057                              <1> 
  4058                              <1> rename_sf_change_directory:
  4059 00008F6A 803D[27620100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  4060 00008F71 7618                <1> 	jna	short rename_sf_find
  4061                              <1> 
  4062 00008F73 FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  4063 00008F79 BE[27620100]        <1> 	mov	esi, FindFile_Directory
  4064 00008F7E 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  4065 00008F80 E81D0F0000          <1> 	call	change_current_directory
  4066 00008F85 0F828AF7FFFF        <1>  	jc	loc_file_rw_cmd_failed
  4067                              <1> 
  4068                              <1> ;rename_sf_change_prompt_dir_string:
  4069                              <1> 	;call	change_prompt_dir_string
  4070                              <1> 
  4071                              <1> rename_sf_find:
  4072                              <1> 	;mov	esi, [DelFile_FNPointer]
  4073 00008F8B BE[68620100]        <1> 	mov	esi, FindFile_Name
  4074                              <1> 
  4075 00008F90 66B80008            <1> 	mov	ax, 0800h ; Except volume labels
  4076 00008F94 E84EF3FFFF          <1> 	call	find_first_file
  4077 00008F99 0F8276F7FFFF        <1> 	jc	loc_file_rw_cmd_failed
  4078                              <1> 
  4079                              <1> loc_rename_sf_ambgfn_check:
  4080 00008F9F 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  4081                              <1> 	;	(Note: It was BX in TRDOS v1)
  4082                              <1> 	;jz	short loc_rename_sf_found
  4083 00008FA2 0F8571FCFFFF        <1> 	jnz	loc_file_not_found
  4084                              <1> 
  4085                              <1> 	;mov	eax, 2 ; File not found sign
  4086                              <1> 	;stc
  4087                              <1> 	;jmp	loc_file_rw_cmd_failed   
  4088                              <1> 
  4089                              <1> loc_rename_sf_found:
  4090                              <1> 	; EDI = Directory buffer entry offset/address
  4091                              <1> 	; BL = File (or Directory) Attributes 
  4092                              <1> 	;	(Note: It was 'CL' in TRDOS v1)
  4093                              <1> 	; mov	bl, [EDI+0Bh]
  4094                              <1> 
  4095 00008FA8 F6C307              <1> 	test	bl, 07h ; Attributes, S-H-R
  4096 00008FAB 0F856EF7FFFF        <1> 	jnz	loc_permission_denied
  4097                              <1> 	
  4098 00008FB1 BE[26620100]        <1>         mov     esi, FindFile_Drv
  4099 00008FB6 BF[6C630100]        <1>         mov     edi, SourceFile_Drv
  4100 00008FBB B920000000          <1> 	mov	ecx, 32
  4101 00008FC0 F3A5                <1> 	rep	movsd
  4102                              <1> 
  4103                              <1> loc_rename_df_parse_path_name:
  4104 00008FC2 8B35[68630100]      <1> 	mov	esi, [DestinationFilePath]
  4105 00008FC8 BF[26620100]        <1> 	mov	edi, FindFile_Drv
  4106 00008FCD E8E6140000          <1> 	call	parse_path_name
  4107 00008FD2 7219                <1> 	jc	short loc_rename_df_cmd_failed
  4108                              <1> 
  4109                              <1> 	;mov	dh, [RUN_CDRV]
  4110 00008FD4 8A35[86590100]      <1> 	mov	dh, [Current_Drv]
  4111                              <1> 
  4112                              <1> 	; 'rename' command is valid only for same dos drive and same dir!
  4113                              <1> 	; ('move' command must be used if source file and destination file
  4114                              <1> 	; directories are not same!) 
  4115 00008FDA 8A15[26620100]      <1> 	mov	dl, [FindFile_Drv]
  4116 00008FE0 38F2                <1> 	cmp	dl, dh ; are source and destination drives different ?!
  4117 00008FE2 7509                <1> 	jne	short loc_rename_df_cmd_failed ; yes! 
  4118                              <1> 
  4119                              <1> rename_df_check_dirname_exists:
  4120 00008FE4 803D[27620100]00    <1> 	cmp	byte [FindFile_Directory], 0
  4121 00008FEB 760B                <1> 	jna	short rename_df_check_filename_exists
  4122                              <1> 
  4123                              <1> 	; different source file and destination file directories !
  4124                              <1> loc_rename_df_cmd_failed:
  4125 00008FED B801000000          <1> 	mov	eax, 1 ; TRDOS 'Bad command or file name' error
  4126 00008FF2 F9                  <1> 	stc
  4127 00008FF3 E91DF7FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4128                              <1> 	  
  4129                              <1> rename_df_check_filename_exists:
  4130 00008FF8 BE[68620100]        <1> 	mov	esi, FindFile_Name
  4131 00008FFD E8A3F6FFFF          <1> 	call	check_filename
  4132 00009002 0F82BFF7FFFF        <1> 	jc	loc_mkdir_invalid_dir_name_chars
  4133                              <1> 
  4134                              <1> 	;mov	[DelFile_FNPointer], esi 
  4135                              <1> 	;cmp	byte [esi], 20h
  4136                              <1> 	;ja	short loc_rename_df_find
  4137                              <1> 
  4138                              <1> 	;mov	dh, [Current_Drv] ; dh has not been changed
  4139                              <1> 
  4140                              <1> rename_df_drv_check_writable:
  4141 00009008 0FB6F6              <1> 	movzx	esi, dh
  4142                              <1> 	;movzx	esi, byte [Current_Drv]
  4143 0000900B 81C600010900        <1> 	add	esi, Logical_DOSDisks
  4144                              <1> 
  4145 00009011 88F2                <1> 	mov	dl, dh ; dl = [Current_Drv]
  4146 00009013 8A7601              <1> 	mov	dh, [esi+LD_DiskType]
  4147                              <1> 
  4148 00009016 80FE01              <1> 	cmp	dh, 1 ; 0 = Invalid
  4149 00009019 7310                <1> 	jnb	short rename_df_compare_sf_df_name
  4150                              <1> 
  4151                              <1> 	; 16/10/2016 (13h -> 30)
  4152 0000901B B81E000000          <1> 	mov	eax, 30 ; 'Disk write-protected' error
  4153 00009020 8B1D[68630100]      <1> 	mov	ebx, [DestinationFilePath] 
  4154 00009026 E9EAF6FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4155                              <1> 
  4156                              <1> rename_df_compare_sf_df_name:
  4157 0000902B BE[68620100]        <1> 	mov	esi, FindFile_Name
  4158 00009030 BF[AE630100]        <1> 	mov	edi, SourceFile_Name
  4159 00009035 B90C000000          <1> 	mov	ecx, 12
  4160                              <1> rename_df_compare_sf_df_name_next: 
  4161 0000903A AC                  <1> 	lodsb
  4162 0000903B AE                  <1> 	scasb
  4163 0000903C 7506                <1> 	jne	short loc_rename_df_find
  4164 0000903E 08C0                <1> 	or	al, al
  4165 00009040 74AB                <1> 	jz	short loc_rename_df_cmd_failed
  4166 00009042 E2F6                <1> 	loop	rename_df_compare_sf_df_name_next 
  4167                              <1> 
  4168                              <1> loc_rename_df_find:
  4169                              <1> 	;mov	esi, [DelFile_FNPointer]
  4170 00009044 BE[68620100]        <1> 	mov	esi, FindFile_Name
  4171                              <1> 
  4172 00009049 6631C0              <1> 	xor	ax, ax ; Any
  4173 0000904C E896F2FFFF          <1> 	call	find_first_file
  4174                              <1> 	;jnc	short loc_rename_df_found
  4175                              <1> 	; 29/12/2017
  4176 00009051 0F83C8F6FFFF        <1> 	jnc	loc_permission_denied
  4177                              <1> 
  4178                              <1> loc_rename_df_check_error_code:
  4179                              <1> 	;cmp	eax, 2
  4180 00009057 3C02                <1> 	cmp	al, 2 ; Not found error
  4181 00009059 7406                <1> 	je	short rename_df_move_find_struct_to_dest
  4182 0000905B F9                  <1> 	stc
  4183 0000905C E9B4F6FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4184                              <1> 
  4185                              <1> ;loc_rename_df_found:
  4186                              <1> 	; 05/11/2016
  4187                              <1> 	; Permission denied error
  4188                              <1> 	;mov	eax, ERR_PERM_DENIED ; 29/12/2017
  4189                              <1> 	;stc
  4190                              <1> 	;jmp	loc_permission_denied  ; 06/11/2016
  4191                              <1> 
  4192                              <1> rename_df_move_find_struct_to_dest:
  4193 00009061 BE[26620100]        <1>         mov     esi, FindFile_Drv
  4194 00009066 BF[EC630100]        <1>         mov     edi, DestinationFile_Drv
  4195 0000906B B920000000          <1> 	mov	ecx, 32
  4196 00009070 F3A5                <1> 	rep	movsd
  4197                              <1> 
  4198                              <1> loc_rename_df_process_q_sf:
  4199                              <1> 	;mov	ecx, 12
  4200 00009072 B10C                <1> 	mov	cl, 12
  4201 00009074 BE[AE630100]        <1>  	mov	esi, SourceFile_Name
  4202 00009079 BF[B1120100]        <1> 	mov	edi, Rename_OldName
  4203                              <1> rename_df_process_q_nml_1_sf:
  4204 0000907E AC                  <1> 	lodsb
  4205 0000907F 3C20                <1>         cmp	al, 20h
  4206 00009081 7603                <1>         jna	short rename_df_process_q_nml_2_sf
  4207 00009083 AA                  <1> 	stosb
  4208 00009084 E2F8                <1> 	loop	rename_df_process_q_nml_1_sf
  4209                              <1> 
  4210                              <1> rename_df_process_q_nml_2_sf:
  4211 00009086 C60700              <1> 	mov	byte [edi], 0
  4212                              <1> 
  4213                              <1> loc_rename_df_process_q_df:
  4214                              <1> 	;mov	ecx, 12
  4215 00009089 B10C                <1> 	mov	cl, 12
  4216 0000908B BE[2E640100]        <1> 	mov	esi, DestinationFile_Name
  4217 00009090 BF[C2120100]        <1> 	mov	edi, Rename_NewName
  4218                              <1> rename_df_process_q_nml_1_df:
  4219 00009095 AC                  <1> 	lodsb
  4220 00009096 3C20                <1> 	cmp	al, 20h
  4221 00009098 7603                <1> 	jna	short loc_rename_df_process_q_nml_2_df
  4222 0000909A AA                  <1> 	stosb
  4223 0000909B E2F8                <1> 	loop	rename_df_process_q_nml_1_df
  4224                              <1> 
  4225                              <1> loc_rename_df_process_q_nml_2_df:
  4226 0000909D C60700              <1> 	mov	byte [edi], 0
  4227                              <1> 
  4228                              <1> loc_rename_confirmation_question:
  4229 000090A0 BE[89120100]        <1> 	mov	esi, Msg_DoYouWantRename
  4230 000090A5 E823D3FFFF          <1> 	call	print_msg
  4231                              <1> 
  4232 000090AA A0[C9630100]        <1> 	mov	al, [SourceFile_DirEntry+11] ; Attributes
  4233 000090AF 2410                <1> 	and	al, 10h
  4234 000090B1 750C                <1> 	jnz	short rename_confirmation_question_dir
  4235                              <1> 
  4236                              <1> rename_confirmation_question_file:
  4237 000090B3 BE[A0120100]        <1> 	mov	esi, Rename_File
  4238 000090B8 E810D3FFFF          <1> 	call	print_msg 
  4239 000090BD EB0A                <1> 	jmp	short rename_confirmation_question_as 
  4240                              <1> 
  4241                              <1> rename_confirmation_question_dir:
  4242 000090BF BE[A6120100]        <1> 	mov	esi, Rename_Directory
  4243 000090C4 E804D3FFFF          <1> 	call	print_msg
  4244                              <1> 
  4245                              <1> rename_confirmation_question_as:
  4246 000090C9 BE[B1120100]        <1> 	mov	esi, Rename_OldName
  4247 000090CE E8FAD2FFFF          <1> 	call	print_msg
  4248 000090D3 BE[BE120100]        <1> 	mov	esi, Msg_File_rename_as
  4249 000090D8 E8F0D2FFFF          <1> 	call	print_msg
  4250 000090DD BE[E5110100]        <1> 	mov	esi, Msg_YesNo
  4251 000090E2 E8E6D2FFFF          <1> 	call	print_msg
  4252                              <1> 
  4253                              <1> loc_rename_ask_again:
  4254 000090E7 30E4                <1> 	xor	ah, ah
  4255 000090E9 E8317BFFFF          <1> 	call	int16h
  4256 000090EE 3C1B                <1> 	cmp	al, 1Bh
  4257 000090F0 740F                <1> 	je	short loc_do_not_rename_file
  4258 000090F2 24DF                <1> 	and	al, 0DFh
  4259 000090F4 A2[EF110100]        <1> 	mov	[Y_N_nextline], al
  4260 000090F9 3C59                <1> 	cmp	al, 'Y'
  4261 000090FB 7404                <1> 	je	short loc_yes_rename_file
  4262 000090FD 3C4E                <1> 	cmp	al, 'N'
  4263 000090FF 75E6                <1> 	jne	short loc_rename_ask_again
  4264                              <1> 
  4265                              <1> loc_do_not_rename_file:
  4266                              <1> loc_yes_rename_file:
  4267 00009101 E848F7FFFF          <1> 	call	y_n_answer ; 29/12/2017
  4268                              <1> 	;cmp	al, 'Y' ; 'yes'
  4269                              <1> 	;cmc
  4270                              <1>         ;jnc	loc_file_rw_restore_retn
  4271 00009106 3C4E                <1> 	cmp	al, 'N' ; 'no'
  4272 00009108 0F8407F6FFFF        <1>         je	loc_file_rw_restore_retn  
  4273                              <1> 
  4274 0000910E BE[C2120100]        <1> 	mov	esi, Rename_NewName
  4275 00009113 668B0D[E6630100]    <1> 	mov	cx, [SourceFile_DirEntryNumber] 
  4276 0000911A 66A1[D2630100]      <1> 	mov	ax, [SourceFile_DirEntry+20] ; First Cluster, HW 
  4277 00009120 C1E010              <1> 	shl	eax, 16 ; 13/11/2017
  4278 00009123 66A1[D8630100]      <1> 	mov	ax, [SourceFile_DirEntry+26] ; First Cluster, LW 
  4279                              <1> 
  4280 00009129 0FB61D[BB630100]    <1>   	movzx	ebx, byte [SourceFile_LongNameEntryLength]  
  4281 00009130 E8CB1B0000          <1>    	call	rename_directory_entry
  4282 00009135 E9FBF6FFFF          <1> 	jmp	loc_rename_file_ok	
  4283                              <1> ;loc_rename_file_ok:
  4284                              <1> ;	jc	loc_run_cmd_failed
  4285                              <1> ;	mov	esi, Msg_OK
  4286                              <1> ;	call	proc_printmsg
  4287                              <1> ;	jmp	loc_file_rw_restore_retn
  4288                              <1> 
  4289                              <1> move_file:
  4290                              <1> 	; 11/03/2016
  4291                              <1> 	; 09/03/2016
  4292                              <1> 	; 08/03/2016 (TRDOS 386 = TRDOS v2.0)
  4293                              <1> 	; 21/05/2011 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_move')
  4294                              <1> 	; 23/04/2011
  4295                              <1> 
  4296                              <1> get_move_source_fchar:
  4297                              <1> 	; esi = file name
  4298 0000913A 803E20              <1> 	cmp	byte [esi], 20h
  4299 0000913D 7614                <1>         jna	short loc_move_nofilename_retn
  4300                              <1> 
  4301 0000913F 8935[64630100]      <1> 	mov	[SourceFilePath], esi
  4302                              <1> 
  4303                              <1> move_scan_source_file:
  4304 00009145 46                  <1> 	inc	esi
  4305 00009146 803E20              <1> 	cmp	byte [esi], 20h
  4306 00009149 7409                <1>         je      short move_scan_destination_1
  4307                              <1> 	;jb	short loc_move_nofilename_retn
  4308 0000914B 0F8286ECFFFF        <1> 	jb	loc_cmd_failed
  4309 00009151 EBF2                <1> 	jmp	short move_scan_source_file
  4310                              <1> 
  4311                              <1> loc_move_nofilename_retn:
  4312 00009153 C3                  <1> 	retn
  4313                              <1> 
  4314                              <1> move_scan_destination_1:
  4315 00009154 C60600              <1> 	mov	byte [esi], 0
  4316                              <1> 
  4317                              <1> move_scan_destination_2:
  4318 00009157 46                  <1> 	inc	esi  
  4319 00009158 803E20              <1> 	cmp	byte [esi], 20h
  4320 0000915B 74FA                <1> 	je	short move_scan_destination_2
  4321                              <1> 	;jb	short loc_move_nofilename_retn
  4322 0000915D 0F8274ECFFFF        <1> 	jb	loc_cmd_failed
  4323                              <1> 
  4324 00009163 8935[68630100]      <1> 	mov	[DestinationFilePath], esi
  4325                              <1> 
  4326                              <1> move_scan_destination_3:
  4327 00009169 46                  <1> 	inc	esi  
  4328 0000916A 803E20              <1> 	cmp	byte [esi], 20h
  4329 0000916D 77FA                <1> 	ja	short move_scan_destination_3
  4330 0000916F C60600              <1> 	mov	byte [esi], 0
  4331                              <1> 
  4332                              <1> loc_move_scan_destination_OK:
  4333 00009172 8B35[64630100]      <1> 	mov	esi, [SourceFilePath]
  4334 00009178 8B3D[68630100]      <1> 	mov	edi, [DestinationFilePath]
  4335                              <1> 
  4336 0000917E B001                <1> 	mov	al, 1  ; move procedure Phase 1
  4337 00009180 E8F71B0000          <1> 	call	move_source_file_to_destination_file
  4338 00009185 7328                <1> 	jnc	short move_source_file_to_destination_question
  4339                              <1> 
  4340                              <1> loc_move_cmd_failed_1:
  4341 00009187 08C0                <1> 	or	al, al
  4342 00009189 0F8448ECFFFF        <1> 	jz	loc_cmd_failed 
  4343 0000918F 3C11                <1> 	cmp	al, 11h
  4344 00009191 740D                <1> 	je	short loc_msg_not_same_device   
  4345                              <1> 	;cmp	al, 05h
  4346                              <1> 	;cmp	al, ERR_PERM_DENIED ; 29/12/2017
  4347                              <1> 	;jne	loc_run_cmd_failed
  4348                              <1> 	;jmp	loc_permission_denied
  4349 00009193 3C0B                <1> 	cmp	al, ERR_PERM_DENIED
  4350 00009195 0F8484F5FFFF        <1> 	je	loc_permission_denied
  4351 0000919B E962ECFFFF          <1> 	jmp	loc_run_cmd_failed
  4352                              <1> 
  4353                              <1> 	;mov	esi, Msg_Permission_denied
  4354                              <1> 	;call	print_msg
  4355                              <1> 	;jmp	loc_file_rw_restore_retn
  4356                              <1> 
  4357                              <1> loc_msg_not_same_device:
  4358 000091A0 BE[CF120100]        <1> 	mov	esi, msg_not_same_drv 
  4359 000091A5 E823D2FFFF          <1> 	call	print_msg
  4360 000091AA E966F5FFFF          <1> 	jmp	loc_file_rw_restore_retn
  4361                              <1> 
  4362                              <1> move_source_file_to_destination_question:
  4363 000091AF A0[6C630100]        <1>         mov     al, [SourceFile_Drv]
  4364 000091B4 0441                <1> 	add	al, 'A'
  4365 000091B6 A2[31130100]        <1> 	mov	[msg_source_file_drv], al
  4366 000091BB A0[EC630100]        <1>         mov     al, [DestinationFile_Drv]
  4367 000091C0 0441                <1> 	add	al, 'A'
  4368 000091C2 A2[50130100]        <1> 	mov	[msg_destination_file_drv], al
  4369                              <1> 
  4370 000091C7 57                  <1> 	push	edi ; *
  4371                              <1> 
  4372 000091C8 BE[15130100]        <1> 	mov	esi, msg_source_file
  4373 000091CD E8FBD1FFFF          <1> 	call	print_msg
  4374 000091D2 BE[6D630100]        <1> 	mov	esi, SourceFile_Directory
  4375 000091D7 803E20              <1> 	cmp	byte [esi], 20h
  4376 000091DA 7605                <1> 	jna	short msftdfq_sfn
  4377 000091DC E8ECD1FFFF          <1> 	call	print_msg
  4378                              <1> msftdfq_sfn:
  4379 000091E1 BE[AE630100]        <1> 	mov	esi, SourceFile_Name
  4380 000091E6 E8E2D1FFFF          <1> 	call	print_msg
  4381 000091EB BE[34130100]        <1> 	mov	esi, msg_destination_file
  4382 000091F0 E8D8D1FFFF          <1> 	call	print_msg
  4383 000091F5 BE[ED630100]        <1> 	mov	esi, DestinationFile_Directory
  4384 000091FA 803E20              <1> 	cmp	byte [esi], 20h
  4385 000091FD 7605                <1> 	jna	short msftdfq_dfn
  4386 000091FF E8C9D1FFFF          <1> 	call	print_msg
  4387                              <1> msftdfq_dfn:
  4388 00009204 BE[2E640100]        <1> 	mov	esi, DestinationFile_Name
  4389 00009209 E8BFD1FFFF          <1> 	call	print_msg
  4390 0000920E BE[53130100]        <1> 	mov	esi, msg_copy_nextline
  4391 00009213 E8B5D1FFFF          <1> 	call	print_msg
  4392 00009218 BE[53130100]        <1> 	mov	esi, msg_copy_nextline
  4393 0000921D E8ABD1FFFF          <1> 	call	print_msg
  4394                              <1> 
  4395                              <1> loc_move_ask_for_new_file_yes_no:
  4396 00009222 BE[E1120100]        <1> 	mov	esi, Msg_DoYouWantMoveFile
  4397 00009227 E8A1D1FFFF          <1> 	call	print_msg
  4398 0000922C BE[E5110100]        <1> 	mov	esi, Msg_YesNo
  4399 00009231 E897D1FFFF          <1> 	call	print_msg
  4400                              <1> loc_move_ask_for_new_file_again:
  4401 00009236 30E4                <1> 	xor	ah, ah
  4402 00009238 E8E279FFFF          <1> 	call	int16h
  4403 0000923D 3C1B                <1> 	cmp	al, 1Bh
  4404                              <1> 	;je	short loc_do_not_move_file
  4405 0000923F 7441                <1> 	je	short loc_move_y_n_escape
  4406 00009241 24DF                <1> 	and	al, 0DFh
  4407 00009243 A2[EF110100]        <1>         mov     [Y_N_nextline], al
  4408 00009248 3C59                <1> 	cmp	al, 'Y'
  4409 0000924A 7404                <1> 	je	short loc_yes_move_file
  4410 0000924C 3C4E                <1> 	cmp	al, 'N'
  4411 0000924E 75E6                <1> 	jne	short loc_move_ask_for_new_file_again
  4412                              <1> 
  4413                              <1> loc_do_not_move_file:
  4414                              <1> loc_yes_move_file:
  4415 00009250 E8F9F5FFFF          <1> 	call	y_n_answer ; 29/12/2017
  4416 00009255 5F                  <1> 	pop	edi ; *
  4417                              <1> 	;cmp	al, 'Y' ; 'yes'
  4418                              <1> 	;cmc
  4419                              <1>         ;jnc	loc_file_rw_restore_retn
  4420 00009256 3C4E                <1> 	cmp	al, 'N' ; 'no'
  4421 00009258 0F84B7F4FFFF        <1>         je	loc_file_rw_restore_retn
  4422                              <1> 
  4423                              <1> loc_move_yes_move_file:
  4424 0000925E B002                <1> 	mov	al, 2 ; move procedure Phase 2
  4425 00009260 E8171B0000          <1> 	call	move_source_file_to_destination_file
  4426                              <1> 	;jc	short loc_move_cmd_failed_2
  4427 00009265 0F83D0F5FFFF        <1>         jnc     move_source_file_to_destination_OK
  4428                              <1> 
  4429                              <1> ;move_source_file_to_destination_OK:
  4430                              <1> ;	mov	esi, Msg_OK
  4431                              <1> ;	call	print_msg
  4432                              <1> ;	jmp	loc_file_rw_restore_retn
  4433                              <1> 
  4434                              <1> loc_move_cmd_failed_2:
  4435 0000926B 3C27                <1> 	cmp	al, 27h
  4436 0000926D 0F858FEBFFFF        <1> 	jne	loc_run_cmd_failed
  4437                              <1> 
  4438 00009273 BE[FA120100]        <1> 	mov	esi, msg_insufficient_disk_space
  4439 00009278 E850D1FFFF          <1> 	call	print_msg
  4440                              <1> 
  4441 0000927D E993F4FFFF          <1> 	jmp	loc_file_rw_restore_retn
  4442                              <1> 
  4443                              <1> loc_move_y_n_escape:
  4444 00009282 B04E                <1> 	mov	al, 'N' ; 'no'
  4445 00009284 EBCA                <1> 	jmp	short loc_do_not_move_file
  4446                              <1> 
  4447                              <1> copy_file:
  4448                              <1> 	; 15/10/2016
  4449                              <1> 	; 24/03/2016
  4450                              <1> 	; 21/03/2016
  4451                              <1> 	; 15/03/2016 (TRDOS 386 = TRDOS v2.0)
  4452                              <1> 	; 21/05/2011 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_copy')
  4453                              <1> 	; 01/08/2010
  4454                              <1> 
  4455                              <1> get_copy_source_fchar:
  4456                              <1> 	; esi = file name
  4457 00009286 803E20              <1> 	cmp	byte [esi], 20h
  4458 00009289 7614                <1>         jna     short loc_copy_nofilename_retn
  4459                              <1> 
  4460 0000928B 8935[64630100]      <1> 	mov	[SourceFilePath], esi
  4461                              <1> 
  4462                              <1> copy_scan_source_file:
  4463 00009291 46                  <1> 	inc	esi  
  4464 00009292 803E20              <1> 	cmp	byte [esi], 20h
  4465 00009295 7409                <1> 	je	short copy_scan_destination_1
  4466                              <1> 	;jb	short loc_copy_nofilename_retn
  4467 00009297 0F823AEBFFFF        <1> 	jb	loc_cmd_failed
  4468 0000929D EBF2                <1> 	jmp	short copy_scan_source_file
  4469                              <1> 
  4470                              <1> loc_copy_nofilename_retn:
  4471 0000929F C3                  <1> 	retn
  4472                              <1> 
  4473                              <1> copy_scan_destination_1:
  4474 000092A0 C60600              <1> 	mov	byte [esi], 0
  4475                              <1> 
  4476                              <1> copy_scan_destination_2:
  4477 000092A3 46                  <1> 	inc	esi  
  4478 000092A4 803E20              <1> 	cmp	byte [esi], 20h
  4479 000092A7 74FA                <1> 	je	short copy_scan_destination_2
  4480                              <1> 	;jb	short loc_copy_nofilename_retn
  4481 000092A9 0F8228EBFFFF        <1> 	jb	loc_cmd_failed
  4482                              <1> 
  4483 000092AF 8935[68630100]      <1> 	mov	[DestinationFilePath], esi
  4484                              <1> 
  4485                              <1> copy_scan_destination_3:
  4486 000092B5 46                  <1> 	inc	esi  
  4487 000092B6 803E20              <1> 	cmp	byte [esi], 20h
  4488 000092B9 77FA                <1> 	ja	short copy_scan_destination_3
  4489 000092BB C60600              <1> 	mov	byte [esi], 0
  4490                              <1> 
  4491                              <1> loc_copy_save_current_drive:
  4492 000092BE 8A35[86590100]      <1> 	mov	dh, [Current_Drv]
  4493 000092C4 8835[E2600100]      <1> 	mov	[RUN_CDRV], dh
  4494                              <1> 
  4495                              <1> copy_source_file_to_destination_phase_1:
  4496 000092CA 8B35[64630100]      <1> 	mov	esi, [SourceFilePath]
  4497 000092D0 8B3D[68630100]      <1> 	mov	edi, [DestinationFilePath]
  4498                              <1> 
  4499 000092D6 B001                <1> 	mov	al, 1  ; copy procedure Phase 1
  4500 000092D8 E83C1D0000          <1> 	call	copy_source_file_to_destination_file
  4501 000092DD 732B                <1> 	jnc	short copy_source_file_to_destination_question
  4502                              <1> 
  4503                              <1> loc_copy_cmd_failed_1:
  4504                              <1> 	; 18/03/2016 (restore current drive and directory)
  4505 000092DF 08C0                <1> 	or	al, al
  4506 000092E1 7507                <1> 	jnz	short loc_copy_cmd_failed_2
  4507                              <1> 
  4508 000092E3 FEC0                <1>         inc     al ; mov al, 1 ; Bad command or file name !
  4509 000092E5 E918EBFFFF          <1> 	jmp	loc_run_cmd_failed
  4510                              <1> 
  4511                              <1> loc_copy_cmd_failed_2:
  4512 000092EA 3C27                <1> 	cmp	al, 27h ; Insufficient disk space 
  4513 000092EC 740D                <1> 	je	short loc_file_write_insuff_disk_space_msg
  4514                              <1>  
  4515                              <1> 	; 29/12/2017
  4516                              <1> 	;cmp	al, 05h
  4517 000092EE 3C0B                <1> 	cmp	al, ERR_PERM_DENIED
  4518 000092F0 0F850CEBFFFF        <1> 	jne	loc_run_cmd_failed
  4519                              <1> 	
  4520 000092F6 E924F4FFFF          <1> 	jmp	loc_permission_denied
  4521                              <1> 
  4522                              <1> loc_file_write_insuff_disk_space_msg:
  4523 000092FB BE[FA120100]        <1> 	mov	esi, msg_insufficient_disk_space
  4524 00009300 E8C8D0FFFF          <1> 	call	print_msg
  4525 00009305 E90BF4FFFF          <1>         jmp     loc_file_rw_restore_retn 
  4526                              <1> 
  4527                              <1> copy_source_file_to_destination_question:
  4528 0000930A 57                  <1> 	push	edi ; *
  4529                              <1> 
  4530                              <1> 	; dh = source file attributes
  4531                              <1> 	; dl > 0 -> destination file found
  4532 0000930B 20D2                <1> 	and	dl, dl            
  4533 0000930D 7449                <1> 	jz	short copy_source_file_to_destination_pass_owrq
  4534                              <1> 
  4535                              <1> loc_copy_ask_for_owr_yes_no:
  4536 0000930F BE[56130100]        <1> 	mov	esi, Msg_DoYouWantOverWriteFile
  4537 00009314 E8B4D0FFFF          <1> 	call	print_msg
  4538 00009319 BE[2E640100]        <1> 	mov	esi, DestinationFile_Name
  4539 0000931E E8AAD0FFFF          <1> 	call	print_msg
  4540 00009323 BE[E5110100]        <1> 	mov	esi, Msg_YesNo
  4541 00009328 E8A0D0FFFF          <1> 	call	print_msg
  4542                              <1> 
  4543                              <1> loc_copy_ask_for_owr_again:
  4544 0000932D 30E4                <1> 	xor	ah, ah
  4545 0000932F E8EB78FFFF          <1> 	call	int16h
  4546 00009334 3C1B                <1> 	cmp	al, 1Bh
  4547                              <1>         ;je     loc_do_not_copy_file
  4548 00009336 7419                <1>         je      short loc_copy_y_n_escape
  4549 00009338 24DF                <1> 	and	al, 0DFh
  4550 0000933A A2[EF110100]        <1>         mov     [Y_N_nextline], al
  4551 0000933F 3C59                <1> 	cmp	al, 'Y'
  4552 00009341 0F84B1000000        <1>         je      loc_yes_copy_file
  4553 00009347 3C4E                <1> 	cmp	al, 'N'
  4554 00009349 0F84A9000000        <1>         je      loc_do_not_copy_file
  4555 0000934F EBDC                <1> 	jmp	short loc_copy_ask_for_owr_again
  4556                              <1> 
  4557                              <1> loc_copy_y_n_escape:
  4558 00009351 B04E                <1> 	mov	al, 'N' ; 'no'
  4559 00009353 E9A0000000          <1>         jmp     loc_do_not_copy_file
  4560                              <1> 
  4561                              <1> copy_source_file_to_destination_pass_owrq:
  4562 00009358 A0[6C630100]        <1> 	mov     al, [SourceFile_Drv]
  4563 0000935D 0441                <1> 	add	al, 'A'
  4564 0000935F A2[31130100]        <1> 	mov	[msg_source_file_drv], al
  4565 00009364 A0[EC630100]        <1>         mov     al, [DestinationFile_Drv]
  4566 00009369 0441                <1> 	add	al, 'A'
  4567 0000936B A2[50130100]        <1> 	mov	[msg_destination_file_drv], al
  4568                              <1> 
  4569 00009370 BE[15130100]        <1> 	mov	esi, msg_source_file
  4570 00009375 E853D0FFFF          <1> 	call	print_msg
  4571 0000937A BE[6D630100]        <1> 	mov	esi, SourceFile_Directory
  4572 0000937F 803E20              <1> 	cmp	byte [esi], 20h
  4573 00009382 7605                <1> 	jna	short csftdfq_sfn
  4574 00009384 E844D0FFFF          <1> 	call	print_msg
  4575                              <1> csftdfq_sfn:
  4576 00009389 BE[AE630100]        <1> 	mov	esi, SourceFile_Name
  4577 0000938E E83AD0FFFF          <1> 	call	print_msg
  4578 00009393 BE[34130100]        <1> 	mov	esi, msg_destination_file
  4579 00009398 E830D0FFFF          <1> 	call	print_msg
  4580 0000939D BE[ED630100]        <1> 	mov	esi, DestinationFile_Directory
  4581 000093A2 803E20              <1> 	cmp	byte [esi], 20h
  4582 000093A5 7605                <1> 	jna	short csftdfq_dfn
  4583 000093A7 E821D0FFFF          <1> 	call	print_msg
  4584                              <1> csftdfq_dfn:
  4585 000093AC BE[2E640100]        <1> 	mov	esi, DestinationFile_Name
  4586 000093B1 E817D0FFFF          <1> 	call	print_msg
  4587 000093B6 BE[53130100]        <1> 	mov	esi, msg_copy_nextline
  4588 000093BB E80DD0FFFF          <1> 	call	print_msg
  4589 000093C0 BE[53130100]        <1> 	mov	esi, msg_copy_nextline
  4590 000093C5 E803D0FFFF          <1> 	call	print_msg
  4591                              <1> 
  4592                              <1> loc_copy_ask_for_new_file_yes_no:
  4593 000093CA BE[75130100]        <1> 	mov	esi, Msg_DoYouWantCopyFile
  4594 000093CF E8F9CFFFFF          <1> 	call	print_msg
  4595 000093D4 BE[E5110100]        <1> 	mov	esi, Msg_YesNo
  4596 000093D9 E8EFCFFFFF          <1> 	call	print_msg
  4597                              <1> 
  4598                              <1> loc_copy_ask_for_new_file_again:
  4599 000093DE 30E4                <1> 	xor	ah, ah
  4600 000093E0 E83A78FFFF          <1> 	call	int16h
  4601 000093E5 3C1B                <1> 	cmp	al, 1Bh
  4602 000093E7 740F                <1> 	je	short loc_do_not_copy_file
  4603 000093E9 24DF                <1> 	and	al, 0DFh
  4604 000093EB A2[EF110100]        <1>         mov     [Y_N_nextline], al
  4605 000093F0 3C59                <1> 	cmp	al, 'Y'
  4606 000093F2 7404                <1> 	je	short loc_yes_copy_file
  4607 000093F4 3C4E                <1> 	cmp	al, 'N'
  4608 000093F6 75E6                <1> 	jne	short loc_copy_ask_for_new_file_again
  4609                              <1> 
  4610                              <1> loc_do_not_copy_file:
  4611                              <1> loc_yes_copy_file:
  4612 000093F8 E851F4FFFF          <1> 	call	y_n_answer ; 29/12/2017
  4613 000093FD 5F                  <1> 	pop	edi ; *
  4614                              <1> 	;cmp	al, 'Y' ; 'yes'
  4615                              <1> 	;cmc
  4616                              <1>         ;jnc	loc_file_rw_restore_retn
  4617 000093FE 3C4E                <1> 	cmp	al, 'N' ; 'no'
  4618 00009400 0F840FF3FFFF        <1>         je	loc_file_rw_restore_retn
  4619                              <1> 
  4620                              <1> copy_source_file_to_destination_pass_q:
  4621 00009406 B002                <1> 	mov	al, 2  ; copy procedure Phase 2
  4622 00009408 E80C1C0000          <1> 	call	copy_source_file_to_destination_file
  4623                              <1> 	;jc	short loc_file_write_check_disk_space_err
  4624                              <1> 
  4625                              <1> 	; 24/03/2016
  4626                              <1> 	;push	cx
  4627 0000940D 51                  <1> 	push	ecx ; 29/12/2017
  4628 0000940E BE[53130100]        <1> 	mov	esi, msg_copy_nextline
  4629 00009413 E8B5CFFFFF          <1> 	call	print_msg
  4630 00009418 58                  <1> 	pop	eax ; 29/12/2017
  4631                              <1> 	;;pop	cx
  4632                              <1> 	;pop	ax
  4633                              <1> 
  4634                              <1> 	;or	cl, cl
  4635 00009419 08C0                <1> 	or	al, al
  4636 0000941B 7419                <1> 	jz	short copy_source_file_to_destination_OK
  4637                              <1> 	
  4638                              <1> 	; 15/10/2016 (1Dh -> 18)
  4639                              <1> 	; 18/03/2016 (1Dh)
  4640                              <1> 	;cmp	cl, 18 ; write error
  4641 0000941D 3C12                <1> 	cmp	al, 18
  4642 0000941F 7506                <1> 	jne	short copy_source_file_to_destination_not_OK
  4643                              <1> 	;
  4644                              <1> 	;mov	al, cl ; error number (write fault!)
  4645 00009421 F9                  <1> 	stc
  4646 00009422 E9EEF2FFFF          <1> 	jmp	loc_file_rw_cmd_failed
  4647                              <1> 
  4648                              <1> copy_source_file_to_destination_not_OK:
  4649 00009427 BE[8E130100]        <1> 	mov	esi, Msg_read_file_error_before_EOF
  4650 0000942C E89CCFFFFF          <1> 	call	print_msg
  4651 00009431 E9DFF2FFFF          <1> 	jmp	loc_file_rw_restore_retn	      
  4652                              <1>  
  4653                              <1> copy_source_file_to_destination_OK:
  4654 00009436 BE[F3110100]        <1> 	mov	esi, Msg_OK
  4655 0000943B E88DCFFFFF          <1> 	call	print_msg
  4656                              <1> 
  4657 00009440 E9D0F2FFFF          <1> 	jmp	loc_file_rw_restore_retn
  4658                              <1> 
  4659                              <1> ;loc_file_write_check_disk_space_err:
  4660                              <1> 	;cmp	al, 27h ; Insufficient disk space 
  4661                              <1> 	;je	loc_file_write_insuff_disk_space_msg
  4662                              <1>         ;jb	loc_file_rw_cmd_failed
  4663                              <1> 
  4664                              <1> 	;call	print_misc_error_msg ; 15/03/2016
  4665                              <1>         ;jmp	loc_file_rw_restore_retn 
  4666                              <1> 
  4667                              <1> change_fs_file_attributes:
  4668                              <1> 	; 04/03/2016 ; Temporary
  4669                              <1> 	; AL = File or directory attributes
  4670                              <1> 	; AH = 0 -> Attributes are in MS-DOS format
  4671                              <1> 	; AH > 0 -> Attributes are in SINGLIX format
  4672                              <1> 	;push	ebx
  4673                              <1> 	; ... do somethings here ...
  4674                              <1> 	;pop	ebx
  4675                              <1> 	; BL = File or directory attributes
  4676 00009445 C3                  <1> 	retn
  4677                              <1> 
  4678                              <1> set_get_env:
  4679                              <1> 	; 11/04/2016 (TRDOS 386 = TRDOS v2.0)
  4680                              <1> 	; 02/09/2011 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_set')
  4681                              <1> 	; 2005 - 28/08/2011 
  4682                              <1> get_setenv_fchar:
  4683                              <1> 	; esi = environment variable/string
  4684 00009446 8A06                <1> 	mov	al, [esi]
  4685 00009448 3C20                <1> 	cmp	al, 20h
  4686 0000944A 771E                <1> 	ja	short loc_find_env
  4687                              <1> 
  4688 0000944C BE00300900          <1> 	mov	esi, Env_Page
  4689                              <1> loc_print_setline:
  4690 00009451 803E00              <1> 	cmp	byte [esi], 0
  4691 00009454 7613                <1> 	jna	short loc_setenv_retn
  4692 00009456 E872CFFFFF          <1> 	call	print_msg
  4693 0000945B 56                  <1> 	push	esi
  4694 0000945C BE[FF190100]        <1> 	mov	esi, nextline
  4695 00009461 E867CFFFFF          <1> 	call	print_msg 
  4696 00009466 5E                  <1> 	pop	esi
  4697 00009467 EBE8                <1> 	jmp	short loc_print_setline   
  4698                              <1> 
  4699                              <1> loc_setenv_retn: 
  4700 00009469 C3                  <1> 	retn
  4701                              <1> 
  4702                              <1> loc_find_env:
  4703 0000946A 3C3D                <1> 	cmp	al, '='
  4704 0000946C 0F8465E9FFFF        <1> 	je	loc_cmd_failed
  4705                              <1> 
  4706 00009472 56                  <1> 	push	esi
  4707                              <1> loc_repeat_env_equal_check:
  4708 00009473 46                  <1> 	inc	esi
  4709 00009474 803E3D              <1> 	cmp	byte [esi], '='
  4710 00009477 7431                <1> 	je	short pass_env_equal_check
  4711 00009479 803E20              <1> 	cmp	byte [esi], 20h
  4712 0000947C 73F5                <1> 	jnb	short loc_repeat_env_equal_check
  4713 0000947E C60600              <1> 	mov	byte [esi], 0 
  4714 00009481 5E                  <1> 	pop	esi
  4715 00009482 BF[865A0100]        <1> 	mov	edi, TextBuffer ; out buffer
  4716 00009487 B9FF000000          <1> 	mov	ecx, 255 ; maximum size (limit)
  4717 0000948C 30C0                <1> 	xor	al, al ; 0 -> use [ESI]
  4718 0000948E E89E000000          <1> 	call	get_environment_string
  4719 00009493 72D4                <1> 	jc	short loc_setenv_retn
  4720                              <1> 
  4721 00009495 BE[865A0100]        <1> 	mov	esi, TextBuffer
  4722 0000949A E82ECFFFFF          <1> 	call	print_msg
  4723 0000949F BE[FF190100]        <1> 	mov	esi, nextline
  4724 000094A4 E824CFFFFF          <1> 	call	print_msg
  4725                              <1> 
  4726 000094A9 C3                  <1> 	retn 
  4727                              <1>               
  4728                              <1> pass_env_equal_check:
  4729 000094AA 46                  <1> 	inc	esi
  4730 000094AB 803E20              <1> 	cmp	byte [esi], 20h
  4731 000094AE 73FA                <1> 	jnb	short pass_env_equal_check
  4732 000094B0 C60600              <1> 	mov	byte [esi], 0	
  4733                              <1> 
  4734                              <1> loc_call_set_env_string:
  4735 000094B3 5E                  <1> 	pop	esi
  4736 000094B4 E83B010000          <1> 	call	set_environment_string
  4737 000094B9 73AE                <1> 	jnc	short loc_setenv_retn
  4738                              <1> 
  4739                              <1> loc_set_cmd_failed:
  4740 000094BB 3C08                <1> 	cmp	al, 08h
  4741 000094BD 0F8514E9FFFF        <1> 	jne	loc_cmd_failed
  4742                              <1> 
  4743 000094C3 BE[CE130100]        <1> 	mov	esi, Msg_No_Set_Space
  4744 000094C8 E800CFFFFF          <1> 	call	print_msg
  4745                              <1> 
  4746 000094CD C3                  <1> 	retn
  4747                              <1> 
  4748                              <1> set_get_path:
  4749                              <1> 	; 11/04/2016 (TRDOS 386 = TRDOS v2.0)
  4750                              <1> 	; 03/09/2011 (TRDOS v1, CMD_INTR.ASM, 'cmp_cmd_path')
  4751                              <1> 	; 2005
  4752                              <1> get_path_fchar:
  4753                              <1>  	; esi = path
  4754 000094CE 803E20              <1> 	cmp	byte [esi], 20h
  4755 000094D1 7737                <1> 	ja	short loc_set_path
  4756                              <1> 
  4757 000094D3 BE00300900          <1> 	mov	esi, Env_Page
  4758                              <1> loc_print_path:
  4759 000094D8 803E00              <1> 	cmp	byte [esi], 0
  4760 000094DB 762C                <1> 	jna	short loc_path_retn
  4761                              <1> 
  4762 000094DD BE[2E0E0100]        <1> 	mov	esi, Cmd_Path ; 'PATH' address
  4763 000094E2 BF[865A0100]        <1> 	mov	edi, TextBuffer ; out buffer
  4764 000094E7 30C0                <1> 	xor	al, al  ; use [ESI]
  4765 000094E9 B9FF000000          <1> 	mov	ecx, 255 ; maximum size (limit)
  4766 000094EE E83E000000          <1> 	call	get_environment_string
  4767 000094F3 7214                <1> 	jc	short loc_path_retn
  4768                              <1> 
  4769 000094F5 BE[865A0100]        <1> 	mov	esi, TextBuffer
  4770 000094FA E8CECEFFFF          <1> 	call	print_msg
  4771 000094FF BE[FF190100]        <1> 	mov	esi, nextline
  4772 00009504 E8C4CEFFFF          <1> 	call	print_msg   
  4773                              <1> 
  4774                              <1> loc_path_retn: 
  4775 00009509 C3                  <1> 	retn
  4776                              <1> 
  4777                              <1> loc_set_path:
  4778 0000950A 56                  <1> 	push	esi 
  4779                              <1> loc_set_path_find_end:
  4780 0000950B 46                  <1> 	inc	esi
  4781 0000950C 803E20              <1> 	cmp	byte [esi], 20h
  4782 0000950F 73FA                <1> 	jnb	short loc_set_path_find_end
  4783 00009511 C60600              <1> 	mov	byte [esi], 0 
  4784                              <1> loc_set_path_header: 
  4785 00009514 5E                  <1> 	pop	esi
  4786                              <1> set_path_x: ; 31/12/2017 ('syspath')	  
  4787 00009515 4E                  <1> 	dec	esi
  4788 00009516 C6063D              <1> 	mov	byte [esi], '='
  4789 00009519 4E                  <1> 	dec	esi
  4790 0000951A C60648              <1> 	mov	byte [esi], 'H'
  4791 0000951D 4E                  <1> 	dec	esi
  4792 0000951E C60654              <1> 	mov	byte [esi], 'T'
  4793 00009521 4E                  <1> 	dec	esi
  4794 00009522 C60641              <1> 	mov	byte [esi], 'A'
  4795 00009525 4E                  <1> 	dec	esi
  4796 00009526 C60650              <1> 	mov	byte [esi], 'P'   
  4797                              <1> 
  4798                              <1> loc_path_call_set_env_string:
  4799 00009529 E8C6000000          <1> 	call	set_environment_string
  4800 0000952E 728B                <1>         jc	short loc_set_cmd_failed
  4801                              <1> 
  4802 00009530 C3                  <1> 	retn              
  4803                              <1> 
  4804                              <1> get_environment_string:
  4805                              <1> 	; 12/04/2016
  4806                              <1> 	; 11/04/2016
  4807                              <1> 	; 05/04/2016 (TRDOS 386 = TRDOS v2.0)
  4808                              <1> 	; 02/09/2011 (TRDOS v1, MAINPROG.ASM)
  4809                              <1> 	; 28/08/2011
  4810                              <1> 	; INPUT->
  4811                              <1> 	;	EDI = Output buffer
  4812                              <1> 	;	CX = Buffer length (<= ENV_PAGE_SIZE)
  4813                              <1> 	;
  4814                              <1> 	;	AL > 0 = AL = String sequence number
  4815                              <1> 	;	AL = 0 -> ESI = ASCIIZ Set word 
  4816                              <1> 	;		(environment variable)
  4817                              <1> 	; OUTPUT ->
  4818                              <1> 	;	ESI is not changed
  4819                              <1> 	;	EDI is not changed
  4820                              <1> 	;	EAX = String length (with zero tail)
  4821                              <1> 	;	EDX = Environment variables page address
  4822                              <1> 	;	CF = 1 -> Not found (EAX not valid)
  4823                              <1> 	;
  4824                              <1> 	; (Modified registers: EAX, EDX) 
  4825                              <1> 
  4826 00009531 BA00300900          <1> 	mov	edx, Env_Page
  4827 00009536 803A00              <1> 	cmp	byte [edx], 0
  4828 00009539 7474                <1> 	jz	short get_env_string_with_word_stc_retn
  4829                              <1> 
  4830 0000953B 66890D[F0640100]    <1> 	mov	[env_var_length], cx
  4831                              <1> 
  4832 00009542 51                  <1> 	push	ecx ; *
  4833 00009543 56                  <1> 	push	esi ; **
  4834                              <1> 
  4835 00009544 08C0                <1> 	or	al, al
  4836 00009546 7449                <1> 	jz	short get_env_string_with_word
  4837                              <1> 
  4838                              <1> get_env_string_with_seq_number:
  4839 00009548 B101                <1> 	mov	cl, 1
  4840 0000954A 88C5                <1> 	mov	ch, al
  4841 0000954C 31C0                <1> 	xor	eax, eax
  4842 0000954E 89D6                <1> 	mov	esi, edx ; Env_Page
  4843                              <1> 
  4844                              <1> get_env_string_seq_number_check:
  4845 00009550 38CD                <1> 	cmp	ch, cl
  4846 00009552 7726                <1> 	ja	short get_env_string_seq_number_next
  4847                              <1> 
  4848                              <1> get_env_string_move_to_buff:
  4849 00009554 57                  <1> 	push	edi ; ***
  4850                              <1> 
  4851 00009555 29D2                <1> 	sub	edx, edx
  4852                              <1> 
  4853                              <1> get_env_string_seq_number_repeat1:
  4854 00009557 42                  <1> 	inc	edx
  4855 00009558 AC                  <1> 	lodsb
  4856 00009559 AA                  <1> 	stosb
  4857                              <1> 
  4858 0000955A 66FF0D[F0640100]    <1> 	dec	word [env_var_length]
  4859 00009561 7508                <1> 	jnz	short get_env_string_seq_number_repeat3
  4860                              <1> 
  4861                              <1> get_env_string_seq_number_repeat2:
  4862 00009563 20C0                <1> 	and	al, al
  4863 00009565 7408                <1> 	jz	short get_env_string_seq_number_ok
  4864 00009567 42                  <1> 	inc	edx
  4865 00009568 AC                  <1> 	lodsb
  4866 00009569 EBF8                <1> 	jmp	short get_env_string_seq_number_repeat2
  4867                              <1> 
  4868                              <1> get_env_string_seq_number_repeat3:
  4869 0000956B 08C0                <1> 	or	al, al
  4870 0000956D 75E8                <1> 	jnz	short get_env_string_seq_number_repeat1
  4871                              <1> 
  4872                              <1> get_env_string_seq_number_ok:
  4873 0000956F 5F                  <1> 	pop	edi ; ***
  4874 00009570 89D0                <1> 	mov	eax, edx ; Length of the environment string
  4875                              <1> 			 ; (ASCIIZ, includes ZERO tail)
  4876 00009572 BA00300900          <1> 	mov	edx, Env_Page
  4877                              <1> 
  4878                              <1> get_env_string_stc_retn:
  4879 00009577 5E                  <1> 	pop	esi ; **
  4880 00009578 59                  <1> 	pop	ecx ; *
  4881 00009579 C3                  <1> 	retn   
  4882                              <1> 	
  4883                              <1> get_env_string_seq_number_next:
  4884 0000957A AC                  <1> 	lodsb
  4885 0000957B 08C0                <1> 	or	al, al
  4886 0000957D 75FB                <1> 	jnz	short get_env_string_seq_number_next
  4887                              <1> 
  4888 0000957F 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size ; +512 (+4096)
  4889 00009585 F5                  <1> 	cmc
  4890 00009586 72EF                <1> 	jc	short get_env_string_stc_retn
  4891                              <1> 
  4892 00009588 AC                  <1> 	lodsb
  4893 00009589 3C01                <1> 	cmp	al, 1
  4894 0000958B 72EA                <1> 	jb	short get_env_string_stc_retn
  4895 0000958D FEC1                <1> 	inc	cl
  4896 0000958F EBBF                <1> 	jmp	short get_env_string_seq_number_check
  4897                              <1> 
  4898                              <1> get_env_string_with_word:
  4899 00009591 31C9                <1> 	xor	ecx, ecx
  4900                              <1> 
  4901                              <1> get_env_string_calc_word_length:
  4902 00009593 AC                  <1> 	lodsb 
  4903 00009594 3C20                <1> 	cmp	al, 20h
  4904 00009596 7211                <1> 	jb	short get_env_string_calc_word_length_ok
  4905                              <1> 	;inc	cx
  4906 00009598 FEC1                <1> 	inc	cl
  4907                              <1> 
  4908 0000959A 3C61                <1> 	cmp	al, 'a'
  4909 0000959C 72F5                <1> 	jb	short get_env_string_calc_word_length
  4910 0000959E 3C7A                <1> 	cmp	al, 'z'
  4911 000095A0 77F1                <1> 	ja	short get_env_string_calc_word_length
  4912 000095A2 24DF                <1> 	and	al, 0DFh
  4913 000095A4 8846FF              <1> 	mov	[esi-1], al
  4914 000095A7 EBEA                <1> 	jmp	short get_env_string_calc_word_length
  4915                              <1> 	
  4916                              <1> get_env_string_calc_word_length_ok:
  4917 000095A9 08C9                <1> 	or	cl, cl
  4918 000095AB 7506                <1> 	jnz	short get_env_string_calc_word_length_save
  4919                              <1>      
  4920 000095AD 5E                  <1> 	pop	esi ; **
  4921                              <1> 
  4922                              <1> get_env_string_stc_retn1:
  4923 000095AE 59                  <1> 	pop	ecx ; *
  4924                              <1>         
  4925                              <1> get_env_string_with_word_stc_retn:
  4926 000095AF 31C0                <1> 	xor	eax, eax  
  4927 000095B1 F9                  <1> 	stc
  4928 000095B2 C3                  <1> 	retn
  4929                              <1>   
  4930                              <1> get_env_string_calc_word_length_save:
  4931 000095B3 871C24              <1> 	xchg	ebx, [esp] ; **
  4932 000095B6 89DE                <1> 	mov	esi, ebx 
  4933                              <1> 		; Start of the env string (to be searched)
  4934                              <1> 
  4935 000095B8 57                  <1> 	push	edi ; ***
  4936 000095B9 89D7                <1> 	mov	edi, edx ; Env_Page
  4937                              <1> 
  4938                              <1> get_env_string_compare:
  4939 000095BB 57                  <1> 	push	edi ; ****
  4940 000095BC 51                  <1> 	push	ecx ; ***** ; Variable name length
  4941                              <1> 
  4942                              <1> get_env_string_compare_rep:
  4943 000095BD AC                  <1> 	lodsb
  4944 000095BE AE                  <1> 	scasb
  4945 000095BF 7511                <1> 	jne	short get_env_string_compare_next1
  4946 000095C1 E2FA                <1> 	loop	get_env_string_compare_rep
  4947                              <1> 	
  4948 000095C3 803F3D              <1> 	cmp	byte [edi], '='
  4949 000095C6 750A                <1> 	jne	short get_env_string_compare_next1
  4950                              <1>  
  4951 000095C8 59                  <1> 	pop	ecx ; *****
  4952 000095C9 5F                  <1> 	pop	edi ; ****
  4953 000095CA 89FE                <1> 	mov	esi, edi
  4954 000095CC 5F                  <1> 	pop	edi ; ***
  4955 000095CD 871C24              <1> 	xchg	ebx, [esp] ; **
  4956 000095D0 EB82                <1> 	jmp	short get_env_string_move_to_buff
  4957                              <1> 
  4958                              <1> get_env_string_compare_next1:
  4959 000095D2 89FE                <1> 	mov	esi, edi
  4960 000095D4 59                  <1> 	pop	ecx ; *****
  4961 000095D5 5F                  <1> 	pop	edi ; ****
  4962                              <1> get_env_string_compare_next2:
  4963 000095D6 81FEFF310900        <1> 	cmp	esi, Env_Page + Env_Page_Size - 1 ; +511 (+4095)
  4964 000095DC 7310                <1> 	jnb	short get_env_string_compare_not_ok
  4965 000095DE 20C0                <1> 	and	al, al
  4966 000095E0 AC                  <1> 	lodsb
  4967 000095E1 75F3                <1> 	jnz	short get_env_string_compare_next2
  4968 000095E3 08C0                <1> 	or	al, al
  4969 000095E5 7407                <1> 	jz	short get_env_string_compare_not_ok
  4970 000095E7 4E                  <1> 	dec	esi ; 12/04/2016
  4971 000095E8 89F7                <1> 	mov	edi, esi
  4972 000095EA 89DE                <1> 	mov	esi, ebx
  4973 000095EC EBCD                <1> 	jmp	short get_env_string_compare
  4974                              <1> 
  4975                              <1> get_env_string_compare_not_ok:
  4976 000095EE 5F                  <1> 	pop	edi ; ***
  4977 000095EF 89DE                <1> 	mov	esi, ebx
  4978 000095F1 5B                  <1> 	pop	ebx ; **
  4979 000095F2 EBBA                <1> 	jmp	short get_env_string_stc_retn1
  4980                              <1> 
  4981                              <1> set_environment_string:
  4982                              <1> 	; 13/04/2016
  4983                              <1> 	; 12/04/2016
  4984                              <1> 	; 11/04/2016
  4985                              <1> 	; 06/04/2016
  4986                              <1> 	; 05/04/2016 (TRDOS 386 = TRDOS v2.0)
  4987                              <1> 	; 02/09/2011 (TRDOS v1, MAINPROG.ASM)
  4988                              <1> 	; 29/08/2011
  4989                              <1> 	; 29/08/2011
  4990                              <1> 	; INPUT->
  4991                              <1> 	;	ESI = ASCIIZ environment string
  4992                              <1> 	; OUTPUT ->
  4993                              <1> 	;	ESI is not changed
  4994                              <1> 	;	CF = 1 -> Could not set, 
  4995                              <1> 	;	     insufficient environment space
  4996                              <1> 	;
  4997                              <1> 	; (EAX, EDX will be changed) 
  4998                              <1> 	;
  4999                              <1> 	;    (EAX = Start address of the env string if > 0)	
  5000                              <1> 	;    (EDX = Environment string length)	
  5001                              <1> 
  5002 000095F4 56                  <1> 	push 	esi ; *
  5003                              <1> 
  5004 000095F5 31C0                <1> 	xor	eax, eax
  5005                              <1> 
  5006                              <1> set_env_chk_validation1:
  5007 000095F7 FEC4                <1> 	inc	ah ; variable (string) length
  5008 000095F9 AC                  <1> 	lodsb
  5009 000095FA 3C3D                <1> 	cmp	al, '='
  5010 000095FC 7415                <1> 	je	short set_env_chk_validation2
  5011 000095FE 3C20                <1> 	cmp	al, 20h
  5012 00009600 720F                <1> 	jb	short set_env_string_stc
  5013                              <1> 
  5014                              <1> 	; 06/04/2016
  5015 00009602 3C61                <1> 	cmp	al, 'a'
  5016 00009604 72F1                <1> 	jb	short set_env_chk_validation1
  5017 00009606 3C7A                <1> 	cmp	al, 'z'
  5018 00009608 77ED                <1> 	ja	short set_env_chk_validation1
  5019 0000960A 2C20                <1> 	sub	al, 'a'-'A'
  5020 0000960C 8846FF              <1> 	mov	[esi-1], al
  5021 0000960F EBE6                <1> 	jmp	short set_env_chk_validation1
  5022                              <1> 
  5023                              <1> set_env_string_stc:
  5024 00009611 5E                  <1> 	pop	esi ; *
  5025                              <1> 	;stc
  5026 00009612 C3                  <1> 	retn 
  5027                              <1> 	   
  5028                              <1> set_env_chk_validation2:
  5029 00009613 51                  <1> 	push	ecx ; **
  5030 00009614 53                  <1> 	push	ebx ; *** 
  5031 00009615 57                  <1> 	push	edi ; ****
  5032                              <1> 
  5033                              <1> 	; 12/04/2016
  5034 00009616 8B5C240C            <1> 	mov	ebx, [esp+12]
  5035                              <1> 
  5036                              <1> set_env_chk_validation2w:
  5037 0000961A 89F7                <1> 	mov	edi, esi
  5038 0000961C 4F                  <1> 	dec	edi
  5039                              <1> 
  5040 0000961D 807FFF20            <1> 	cmp	byte [edi-1], 20h
  5041 00009621 771A                <1> 	ja	short set_env_chk_validation2z
  5042                              <1> 	
  5043 00009623 56                  <1> 	push	esi
  5044 00009624 89FE                <1> 	mov	esi, edi
  5045 00009626 4E                  <1> 	dec	esi
  5046                              <1> 
  5047                              <1> set_env_chk_validation2x:
  5048 00009627 4E                  <1> 	dec	esi
  5049                              <1> 
  5050 00009628 39DE                <1> 	cmp	esi, ebx
  5051 0000962A 7207                <1> 	jb	short set_env_chk_validation2y
  5052                              <1> 
  5053 0000962C 4F                  <1> 	dec	edi
  5054                              <1> 
  5055 0000962D 8A06                <1> 	mov	al, [esi]
  5056 0000962F 8807                <1> 	mov	[edi], al
  5057                              <1> 
  5058 00009631 EBF4                <1> 	jmp	short set_env_chk_validation2x
  5059                              <1> 
  5060                              <1> set_env_chk_validation2y:
  5061 00009633 5E                  <1> 	pop	esi
  5062                              <1> 
  5063                              <1> 	;mov	byte [ebx], 20h
  5064                              <1> 	
  5065 00009634 43                  <1> 	inc 	ebx
  5066 00009635 895C240C            <1> 	mov	[esp+12], ebx
  5067                              <1> 
  5068 00009639 FECC                <1> 	dec 	ah ; 13/04/2016
  5069                              <1> 
  5070 0000963B EBDD                <1> 	jmp	short set_env_chk_validation2w
  5071                              <1> 	
  5072                              <1> set_env_chk_validation2z:	
  5073 0000963D BA00300900          <1> 	mov	edx, Env_Page
  5074 00009642 89D7                <1> 	mov	edi, edx
  5075                              <1> 
  5076                              <1> set_env_chk_validation3:
  5077 00009644 AC                  <1> 	lodsb
  5078 00009645 3C20                <1> 	cmp	al, 20h
  5079 00009647 74FB                <1> 	je	short set_env_chk_validation3
  5080                              <1> 
  5081 00009649 9C                  <1> 	pushf
  5082                              <1> 
  5083                              <1> 	; 12/04/2016
  5084                              <1> set_env_chk_validation3n:
  5085 0000964A 3C61                <1> 	cmp	al, 'a'
  5086 0000964C 720C                <1> 	jb	short set_env_chk_validation3c
  5087 0000964E 3C7A                <1> 	cmp	al, 'z'
  5088 00009650 7705                <1> 	ja	short set_env_chk_validation3x
  5089 00009652 2C20                <1> 	sub	al, 'a'-'A'
  5090 00009654 8846FF              <1> 	mov	[esi-1], al
  5091                              <1> 
  5092                              <1> set_env_chk_validation3x:
  5093 00009657 AC                  <1> 	lodsb
  5094 00009658 EBF0                <1> 	jmp	short set_env_chk_validation3n
  5095                              <1> 
  5096                              <1> set_env_chk_validation3c:
  5097 0000965A 3C20                <1> 	cmp	al, 20h
  5098 0000965C 73F9                <1> 	jnb	short set_env_chk_validation3x
  5099                              <1> 		
  5100 0000965E 803F00              <1> 	cmp	byte [edi], 0
  5101 00009661 7731                <1> 	ja	short set_env_chk_validation4
  5102                              <1> 
  5103 00009663 9D                  <1> 	popf
  5104 00009664 7228                <1> 	jb	short set_env_string_nothing
  5105                              <1> 
  5106 00009666 B900020000          <1> 	mov	ecx, Env_Page_Size ; 512 (4096)
  5107                              <1> 
  5108 0000966B 89DE                <1> 	mov	esi, ebx ; 12/04/2016
  5109                              <1> 
  5110                              <1> set_env_string_copy_to_envb:
  5111 0000966D AC                  <1> 	lodsb
  5112 0000966E 3C20                <1> 	cmp	al, 20h
  5113 00009670 720A                <1> 	jb	short set_env_string_copy_to_envb_z
  5114 00009672 AA                  <1> 	stosb
  5115 00009673 E2F8                <1> 	loop	set_env_string_copy_to_envb
  5116                              <1> 
  5117                              <1> 	; 11/04/2016
  5118 00009675 89D7                <1> 	mov	edi, edx ; Env_Page
  5119 00009677 B900020000          <1> 	mov	ecx, Env_Page_Size 
  5120                              <1> 
  5121                              <1> set_env_string_copy_to_envb_z:
  5122 0000967C 52                  <1> 	push	edx  ; Start address of the variable
  5123 0000967D BA00020000          <1> 	mov	edx, Env_Page_Size
  5124 00009682 29CA                <1> 	sub	edx, ecx ; variable (string) length
  5125                              <1> 
  5126 00009684 28C0                <1> 	sub	al, al ; 0
  5127 00009686 F3AA                <1>  	rep	stosb ; clear remain bytes of the env page
  5128                              <1> 
  5129 00009688 58                  <1> 	pop	eax  ; Start address of the variable
  5130                              <1> 
  5131                              <1> set_env_string_allocate_envb_retn:  ; stc or clc return
  5132 00009689 5F                  <1> 	pop	edi ; ****
  5133 0000968A 5B                  <1> 	pop	ebx ; ***
  5134 0000968B 59                  <1> 	pop	ecx ; **
  5135 0000968C 5E                  <1> 	pop	esi ; *	
  5136 0000968D C3                  <1> 	retn
  5137                              <1> 
  5138                              <1> set_env_string_nothing:
  5139 0000968E 31C0                <1> 	xor	eax, eax
  5140 00009690 31D2                <1> 	xor	edx, edx ; 11/04/2016
  5141 00009692 EBF5                <1> 	jmp	short set_env_string_allocate_envb_retn
  5142                              <1> 
  5143                              <1> set_env_chk_validation4:
  5144                              <1> 	; 11/04/2016
  5145 00009694 9D                  <1> 	popf
  5146                              <1> 
  5147 00009695 89D6                <1> 	mov	esi, edx  ; Env_Page
  5148                              <1> 
  5149                              <1> set_env_chk_validation5:	
  5150 00009697 89DF                <1> 	mov	edi, ebx  ; ASCIIZ environment string address	
  5151 00009699 0FB6CC              <1> 	movzx	ecx, ah ; Variable (string) length (with '=')
  5152                              <1> 
  5153                              <1> set_env_chk_validation5_loop:
  5154 0000969C AC                  <1> 	lodsb
  5155 0000969D AE                  <1> 	scasb
  5156 0000969E 750A                <1> 	jne	short set_env_chk_validation6
  5157 000096A0 E2FA                <1> 	loop	set_env_chk_validation5_loop
  5158                              <1> 
  5159 000096A2 3C3D                <1> 	cmp	al, '='
  5160 000096A4 0F8483000000        <1>         je      set_env_change_variable
  5161                              <1> 
  5162                              <1> set_env_chk_validation6:
  5163 000096AA 08C0                <1> 	or	al, al ; 0
  5164 000096AC 7403                <1> 	jz	short set_env_chk_validation7
  5165                              <1> 
  5166 000096AE AC                  <1> 	lodsb
  5167 000096AF EBF9                <1> 	jmp	short set_env_chk_validation6
  5168                              <1> 
  5169                              <1> set_env_chk_validation7:
  5170 000096B1 88E1                <1> 	mov	cl, ah
  5171 000096B3 01F1                <1> 	add	ecx, esi
  5172 000096B5 81F9FF310900        <1> 	cmp	ecx, Env_Page + Env_Page_Size - 1 
  5173                              <1> 		; 511 (4095) 
  5174                              <1> 		; strlen + '=' + 0
  5175 000096BB 72DA                <1> 	jb	short set_env_chk_validation5
  5176                              <1> 
  5177                              <1> set_env_chk_validation8: ; variable not found
  5178 000096BD 0FB6F4              <1> 	movzx	esi, ah  ; variable name length (with '=') 
  5179 000096C0 01DE                <1> 	add	esi, ebx ; position just after of the '='
  5180                              <1> 
  5181                              <1> set_env_chk_validation8_loop:
  5182 000096C2 AC                  <1> 	lodsb
  5183 000096C3 3C20                <1> 	cmp	al, 20h
  5184 000096C5 74FB                <1> 	je	short set_env_chk_validation8_loop	
  5185 000096C7 72C5                <1> 	jb	short set_env_string_nothing
  5186                              <1> 
  5187                              <1> set_env_chk_validation9:
  5188 000096C9 AC                  <1> 	lodsb
  5189 000096CA 3C20                <1> 	cmp	al, 20h
  5190 000096CC 73FB                <1> 	jnb	short set_env_chk_validation9
  5191                              <1> 
  5192                              <1> 	; End of ASCIIZ environment string
  5193                              <1> 
  5194                              <1> set_env_add_variable:
  5195 000096CE 29DE                <1> 	sub	esi, ebx ; variable+definition length
  5196                              <1> 	
  5197 000096D0 56                  <1> 	push	esi ; *****
  5198                              <1> 
  5199 000096D1 89D6                <1> 	mov	esi, edx ; Environment page address
  5200                              <1> 
  5201 000096D3 B900020000          <1> 	mov	ecx, Env_Page_Size ; 512 (4096)	
  5202                              <1> 
  5203                              <1> set_env_add_variable_loop:
  5204 000096D8 AC                  <1> 	lodsb
  5205 000096D9 20C0                <1> 	and	al, al		
  5206 000096DB 7406                <1> 	jz	short set_env_add_variable_chk1 ; 0
  5207 000096DD E2F9                <1> 	loop	set_env_add_variable_loop
  5208                              <1> 
  5209                              <1> 	; 11/04/2016
  5210 000096DF 884EFF              <1> 	mov	[esi-1], cl ; 0
  5211 000096E2 41                  <1> 	inc	ecx
  5212                              <1> 	
  5213                              <1> set_env_add_variable_chk1: 
  5214 000096E3 49                  <1> 	dec	ecx
  5215 000096E4 7408                <1> 	jz	short set_env_add_variable_nspc
  5216 000096E6 AC                  <1> 	lodsb
  5217 000096E7 08C0                <1> 	or 	al, al
  5218 000096E9 740C                <1> 	jz	short set_env_add_variable_chk2 ; 00
  5219 000096EB 49                  <1> 	dec	ecx
  5220 000096EC 75EA                <1> 	jnz	short set_env_add_variable_loop
  5221                              <1> 
  5222                              <1> set_env_add_variable_nspc: ; no space on environment page
  5223 000096EE 58                  <1> 	pop	eax ; *****
  5224 000096EF B808000000          <1> 	mov	eax, 8 ; No space for new environment string
  5225 000096F4 F9                  <1> 	stc
  5226 000096F5 EB92                <1>         jmp     short set_env_string_allocate_envb_retn
  5227                              <1> 
  5228                              <1> set_env_add_variable_chk2:
  5229 000096F7 8B0C24              <1> 	mov	ecx, [esp] ; *****
  5230 000096FA 4E                  <1> 	dec	esi ; beginning address of the new variable
  5231 000096FB 89F0                <1> 	mov	eax, esi
  5232 000096FD 01C8                <1> 	add	eax, ecx ; string length (with CR)
  5233 000096FF 81C200020000        <1> 	add	edx, Env_Page_Size ; 512 (4096)
  5234 00009705 39D0                <1> 	cmp	eax, edx 
  5235 00009707 77E5                <1> 	ja	short set_env_add_variable_nspc
  5236 00009709 49                  <1> 	dec	ecx ; except CR at the end
  5237 0000970A 89CA                <1> 	mov	edx, ecx ; 12/04/2016
  5238 0000970C 89F7                <1> 	mov	edi, esi
  5239 0000970E 893C24              <1> 	mov	[esp], edi ; ***** ; Start address of new variable
  5240 00009711 89DE                <1> 	mov	esi, ebx ; ASCIIZ environment string address
  5241 00009713 F3A4                <1> 	rep	movsb
  5242 00009715 28C0                <1> 	sub	al, al
  5243 00009717 AA                  <1> 	stosb
  5244 00009718 58                  <1> 	pop	eax ; ***** ; Beginning address of new variable			
  5245 00009719 81FF00320900        <1>         cmp     edi, Env_Page + Env_Page_Size ; 12/04/2016
  5246 0000971F 0F8364FFFFFF        <1>         jnb     set_env_string_allocate_envb_retn ; OK !
  5247 00009725 880F                <1> 	mov	[edi], cl ; 0
  5248 00009727 F8                  <1> 	clc	; 13/04/2016
  5249 00009728 E95CFFFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5250                              <1> 
  5251                              <1> set_env_change_variable:
  5252                              <1> 	; 06/04/2016
  5253                              <1> 	; esi = Variable's address in environment page (after '=')
  5254                              <1> 	; edi = ASCIIZ environment string address (after '=')
  5255                              <1> 
  5256                              <1> 	; ah = variable length from start to the '='
  5257 0000972D 8825[F0640100]      <1> 	mov	[env_var_length], ah
  5258                              <1> 
  5259 00009733 28C9                <1> 	sub	cl, cl ; ecx = 0
  5260                              <1> 
  5261 00009735 57                  <1> 	push	edi ; *****
  5262                              <1> 
  5263 00009736 89F7                <1> 	mov	edi, esi ; 11/04/2016
  5264                              <1> 
  5265                              <1> set_env_change_variable_calc1:
  5266 00009738 AC                  <1> 	lodsb
  5267 00009739 08C0                <1> 	or	al, al
  5268 0000973B 7403                <1> 	jz	short set_env_change_variable_calc2
  5269                              <1> 
  5270 0000973D 41                  <1> 	inc	ecx ; length of environment string (after the '=')
  5271                              <1> 
  5272 0000973E EBF8                <1> 	jmp	short set_env_change_variable_calc1	
  5273                              <1> 
  5274                              <1> set_env_change_variable_calc2:
  5275 00009740 8B3424              <1> 	mov	esi, [esp] ; ASCIIZ environment string address
  5276                              <1> 	
  5277 00009743 29D2                <1> 	sub	edx, edx
  5278                              <1> 
  5279                              <1> set_env_change_variable_calc3:
  5280 00009745 AC                  <1> 	lodsb
  5281 00009746 3C20                <1> 	cmp	al, 20h
  5282 00009748 7203                <1> 	jb	short set_env_change_variable_calc4
  5283                              <1> 
  5284 0000974A 42                  <1> 	inc	edx ; length of ASCIIZ string (after the '=')
  5285                              <1> 	
  5286 0000974B EBF8                <1> 	jmp	short set_env_change_variable_calc3
  5287                              <1> 	
  5288                              <1> set_env_change_variable_calc4:
  5289 0000974D C646FF00            <1> 	mov	byte [esi-1], 0  ; put ZERO instead of CR
  5290                              <1> 	
  5291 00009751 5E                  <1> 	pop	esi ; ***** ; ASCIIZ string address (after '=')
  5292                              <1> 
  5293                              <1> 	; EDI = Old variable's address (after '=')
  5294                              <1> 	
  5295                              <1> 	; compare the new string with the old string
  5296 00009752 39CA                <1> 	cmp	edx, ecx
  5297 00009754 7717                <1> 	ja	short set_env_change_variable_calc5 ; longer
  5298 00009756 0F828F000000        <1>         jb      set_env_change_variable_calc9 ; shorter
  5299                              <1> 	
  5300                              <1> 	;same length (simple copy)
  5301 0000975C 0FB6C4              <1> 	movzx	eax, ah
  5302 0000975F 01C2                <1> 	add	edx, eax
  5303 00009761 F7D8                <1> 	neg	eax
  5304 00009763 01F8                <1> 	add	eax, edi
  5305                              <1> 	; EAX = Start address of the variable
  5306                              <1> 	; EDX = Variable length (without ZERO at the end of variable)
  5307                              <1> 
  5308 00009765 F3A4                <1> 	rep	movsb
  5309 00009767 F8                  <1> 	clc	; 13/04/2016
  5310 00009768 E91CFFFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5311                              <1> 
  5312                              <1> set_env_change_variable_calc5:
  5313                              <1> 	; 11/04/2016
  5314 0000976D 52                  <1> 	push	edx ; *****
  5315 0000976E 29CA                <1> 	sub	edx, ecx ; difference ; (the new string is longer)
  5316 00009770 89F3                <1> 	mov 	ebx, esi
  5317 00009772 89FE                <1> 	mov	esi, edi
  5318                              <1> 
  5319                              <1> set_env_change_variable_calc6:
  5320 00009774 AC                  <1> 	lodsb 
  5321 00009775 20C0                <1> 	and	al, al
  5322 00009777 75FB                <1> 	jnz	short set_env_change_variable_calc6
  5323                              <1> 
  5324 00009779 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size ; 512 (4096)
  5325 0000977F 0F8369FFFFFF        <1>         jnb     set_env_add_variable_nspc
  5326                              <1> 
  5327 00009785 89F9                <1> 	mov	ecx, edi  ; current (old) variable's address
  5328 00009787 89F7                <1> 	mov	edi, esi  ; next variable's address 
  5329                              <1> 
  5330 00009789 AC                  <1> 	lodsb
  5331 0000978A 08C0                <1> 	or	al, al
  5332 0000978C 7416                <1> 	jz	short set_env_change_variable_calc8 ; 00
  5333                              <1> 
  5334                              <1> set_env_change_variable_calc7:
  5335 0000978E AC                  <1> 	lodsb
  5336 0000978F 20C0                <1> 	and	al, al
  5337 00009791 75FB                <1> 	jnz	short set_env_change_variable_calc7
  5338                              <1> 
  5339 00009793 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size ; 512 (4096)
  5340 00009799 0F834FFFFFFF        <1>         jnb     set_env_add_variable_nspc
  5341                              <1> 
  5342 0000979F AC                  <1> 	lodsb
  5343 000097A0 08C0                <1> 	or	al, al
  5344 000097A2 75EA                <1> 	jnz	short set_env_change_variable_calc7
  5345                              <1> 
  5346                              <1> set_env_change_variable_calc8:
  5347 000097A4 4E                  <1> 	dec	esi ; address of the second (last) 0 of the 00
  5348                              <1> 
  5349 000097A5 01F2                <1> 	add	edx, esi ; final position of the last 0
  5350                              <1> 
  5351 000097A7 81FA00320900        <1> 	cmp	edx, Env_Page + Env_Page_Size ; 512 (4096)
  5352 000097AD 0F833BFFFFFF        <1>         jnb     set_env_add_variable_nspc
  5353                              <1> 
  5354 000097B3 89C8                <1> 	mov	eax, ecx ; old variable's address (after '=')
  5355                              <1> 
  5356 000097B5 89F1                <1> 	mov	ecx, esi 
  5357 000097B7 29F9                <1> 	sub	ecx, edi ; count of bytes to move forward
  5358                              <1> 
  5359                              <1> 	; 13/04/2016
  5360 000097B9 C60200              <1> 	mov	byte [edx], 0
  5361 000097BC 89D7                <1> 	mov	edi, edx
  5362 000097BE 29F2                <1> 	sub	edx, esi ; difference (additional byte count)
  5363 000097C0 4F                  <1> 	dec	edi ; the last zero address (first byte of the 00)
  5364 000097C1 89FE                <1> 	mov	esi, edi
  5365 000097C3 29D6                <1> 	sub	esi, edx ; - displacement
  5366                              <1> 	
  5367 000097C5 FA                  <1> 	cli	; disable interrupts
  5368 000097C6 FD                  <1> 	std	; backward
  5369                              <1> 
  5370 000097C7 F3A4                <1> 	rep	movsb ; move ECX bytes from DS:ESI to ES:EDI
  5371                              <1> 
  5372 000097C9 FC                  <1> 	cld	; forward (default)
  5373 000097CA FB                  <1> 	sti	; enable interrupts
  5374                              <1> 	
  5375 000097CB 89C7                <1> 	mov	edi, eax
  5376 000097CD 59                  <1> 	pop	ecx ; ***** ; byte count (after '=')
  5377 000097CE 89CA                <1> 	mov	edx, ecx
  5378 000097D0 89DE                <1> 	mov	esi, ebx ; ASCIIZ string address (after '=')
  5379 000097D2 89FB                <1> 	mov	ebx, edi
  5380                              <1> 
  5381 000097D4 F3A4                <1> 	rep	movsb
  5382                              <1> 
  5383 000097D6 880F                <1> 	mov	[edi], cl ; 0 ; end of variable
  5384                              <1> 
  5385 000097D8 0FB605[F0640100]    <1> 	movzx	eax, byte [env_var_length]
  5386 000097DF 01C2                <1> 	add	edx, eax ; variable length (total)
  5387 000097E1 F7D8                <1> 	neg	eax
  5388 000097E3 01D8                <1> 	add	eax, ebx ; start address of the variable
  5389 000097E5 F8                  <1> 	clc	; 13/04/2016
  5390 000097E6 E99EFEFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5391                              <1> 
  5392                              <1> set_env_change_variable_calc9:
  5393                              <1> 	; 11/04/2016
  5394 000097EB 21D2                <1> 	and	edx, edx ; is empty ?
  5395 000097ED 753B                <1> 	jnz	short set_env_change_variable_calc15
  5396                              <1> 	
  5397 000097EF 0FB6DC              <1> 	movzx	ebx, ah
  5398 000097F2 F7DB                <1> 	neg	ebx
  5399 000097F4 01FB                <1> 	add	ebx, edi
  5400                              <1> 
  5401                              <1> 	; EBX = Start address of the variable (in env page)
  5402                              <1> 	; EDX = Variable length = 0
  5403                              <1> 	
  5404 000097F6 89FE                <1> 	mov	esi, edi
  5405                              <1> 
  5406                              <1> set_env_change_variable_calc10:
  5407 000097F8 AC                  <1> 	lodsb
  5408 000097F9 08C0                <1> 	or	al, al
  5409 000097FB 75FB                <1> 	jnz	short set_env_change_variable_calc10
  5410                              <1> 
  5411 000097FD B9FF310900          <1> 	mov	ecx, Env_Page + Env_Page_Size - 1
  5412                              <1> 
  5413 00009802 39CE                <1> 	cmp	esi, ecx ; +511 (+4095)
  5414 00009804 7604                <1> 	jna	short set_env_change_variable_calc11
  5415                              <1> 
  5416 00009806 89CE                <1> 	mov	esi, ecx
  5417 00009808 8806                <1> 	mov	[esi], al ; 0
  5418                              <1> 
  5419                              <1> set_env_change_variable_calc11:
  5420 0000980A 89DF                <1> 	mov	edi, ebx ; old variable's start address
  5421                              <1> 
  5422                              <1> set_env_change_variable_calc12:
  5423 0000980C AC                  <1> 	lodsb
  5424 0000980D AA                  <1> 	stosb
  5425 0000980E 20C0                <1> 	and	al, al
  5426 00009810 75FA                <1> 	jnz	short set_env_change_variable_calc12
  5427 00009812 39CE                <1> 	cmp	esi, ecx
  5428 00009814 7706                <1> 	ja	short set_env_change_variable_calc13
  5429 00009816 AC                  <1> 	lodsb
  5430 00009817 AA                  <1> 	stosb
  5431 00009818 20C0                <1> 	and	al, al
  5432 0000981A 75F0                <1> 	jnz	short set_env_change_variable_calc12	
  5433                              <1> 
  5434                              <1> set_env_change_variable_calc13:
  5435 0000981C 29F9                <1> 	sub	ecx, edi
  5436 0000981E 7203                <1> 	jb	short set_env_change_variable_calc14
  5437 00009820 41                  <1> 	inc	ecx ; 1-512 (1-4096)
  5438 00009821 F3AA                <1> 	rep	stosb ; al = 0	
  5439                              <1> 
  5440                              <1> set_env_change_variable_calc14:
  5441 00009823 29C0                <1> 	sub	eax, eax ; Start address of the variable
  5442                              <1> 	; EAX = 0 -> Variable is removed
  5443                              <1> 	; EDX = Variable length = 0	
  5444                              <1> 
  5445 00009825 E95FFEFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5446                              <1> 	    
  5447                              <1> set_env_change_variable_calc15:	
  5448 0000982A 52                  <1> 	push	edx ; *****
  5449 0000982B F7DA                <1> 	neg	edx
  5450 0000982D 01CA                <1> 	add	edx, ecx ; difference (the old string is longer)
  5451 0000982F 89F3                <1> 	mov 	ebx, esi
  5452 00009831 89FE                <1> 	mov	esi, edi
  5453                              <1> 
  5454                              <1> set_env_change_variable_calc16:
  5455 00009833 AC                  <1> 	lodsb 
  5456 00009834 20C0                <1> 	and	al, al
  5457 00009836 75FB                <1> 	jnz	short set_env_change_variable_calc16
  5458                              <1> 
  5459 00009838 B900320900          <1> 	mov	ecx, Env_Page + Env_Page_Size
  5460                              <1> 
  5461 0000983D 39CE                <1> 	cmp	esi, ecx ; +512 (+4096)
  5462 0000983F 7605                <1> 	jna	short set_env_change_variable_calc17
  5463                              <1> 
  5464 00009841 89CE                <1> 	mov	esi, ecx
  5465 00009843 8846FF              <1> 	mov	[esi-1], al ; 0
  5466                              <1> 
  5467                              <1> set_env_change_variable_calc17:
  5468 00009846 89F9                <1> 	mov	ecx, edi  ; current (old) variable's address
  5469 00009848 89F7                <1> 	mov	edi, esi  ; next variable's address 
  5470                              <1> 
  5471 0000984A AC                  <1> 	lodsb
  5472 0000984B 08C0                <1> 	or	al, al
  5473 0000984D 741D                <1> 	jz	short set_env_change_variable_calc20
  5474                              <1> 
  5475                              <1> set_env_change_variable_calc18:
  5476 0000984F AC                  <1> 	lodsb
  5477 00009850 20C0                <1> 	and	al, al
  5478 00009852 75FB                <1> 	jnz	short set_env_change_variable_calc18
  5479                              <1> 
  5480 00009854 81FE00320900        <1> 	cmp	esi, Env_Page + Env_Page_Size
  5481 0000985A 720B                <1> 	jb	short set_env_change_variable_calc19
  5482 0000985C 740E                <1> 	je	short set_env_change_variable_calc20
  5483                              <1> 
  5484 0000985E BEFF310900          <1> 	mov	esi, Env_Page + Env_Page_Size - 1
  5485 00009863 8806                <1> 	mov	[esi], al ; 0
  5486 00009865 EB06                <1> 	jmp	short set_env_change_variable_calc21
  5487                              <1> 
  5488                              <1> set_env_change_variable_calc19:
  5489 00009867 AC                  <1> 	lodsb
  5490 00009868 08C0                <1> 	or	al, al
  5491 0000986A 75E3                <1> 	jnz	short set_env_change_variable_calc18
  5492                              <1> 
  5493                              <1> set_env_change_variable_calc20:
  5494 0000986C 4E                  <1> 	dec	esi ; address of the second (last) 0 of the 00
  5495                              <1> 
  5496                              <1> set_env_change_variable_calc21:
  5497                              <1> 	; edx = difference (byte count)
  5498                              <1> 	
  5499 0000986D 89C8                <1> 	mov	eax, ecx ; old variable's address (after '=')
  5500                              <1> 
  5501 0000986F 89F1                <1> 	mov	ecx, esi 
  5502 00009871 29F9                <1> 	sub	ecx, edi ; count of bytes to move backward
  5503                              <1> 
  5504 00009873 89FE                <1> 	mov	esi, edi ; next variable's address
  5505 00009875 29D7                <1> 	sub	edi, edx ; (displacement)
  5506                              <1> 	
  5507 00009877 F3A4                <1> 	rep	movsb
  5508                              <1> 
  5509 00009879 880F                <1> 	mov	[edi], cl ; 0 ; 00 ; end of environment variables
  5510                              <1> 
  5511 0000987B 89C7                <1> 	mov	edi, eax
  5512 0000987D 5A                  <1> 	pop	edx ; ***** ; byte count (after '=')
  5513 0000987E 89D1                <1> 	mov	ecx, edx
  5514 00009880 89DE                <1> 	mov	esi, ebx ; ASCIIZ string address (after '=')
  5515 00009882 89FB                <1> 	mov	ebx, edi
  5516                              <1> 	
  5517 00009884 F3A4                <1> 	rep	movsb
  5518                              <1> 
  5519 00009886 880F                <1> 	mov	[edi], cl ; 0 ; end of variable
  5520                              <1> 
  5521 00009888 0FB605[F0640100]    <1> 	movzx	eax, byte [env_var_length]
  5522 0000988F 01C2                <1> 	add	edx, eax ; variable length (total)
  5523 00009891 F7D8                <1> 	neg	eax
  5524 00009893 01D8                <1> 	add	eax, ebx ; start address of the variable
  5525 00009895 F8                  <1> 	clc	; 13/04/2016
  5526 00009896 E9EEFDFFFF          <1>         jmp     set_env_string_allocate_envb_retn ; OK !
  5527                              <1> 
  5528                              <1> mainprog_startup_configuration:
  5529                              <1> 	; 22/11/2017
  5530                              <1> 	; 06/05/2016
  5531                              <1> 	; 14/04/2016 (TRDOS 386 = TRDOS v2.0)
  5532                              <1> 	; 17/09/2011 (TRDOS v1, MAINPROG.ASM)
  5533                              <1> 	;
  5534                              <1> loc_load_mainprog_cfg_file:
  5535 0000989B BE[A80D0100]        <1> 	mov	esi, MainProgCfgFile
  5536 000098A0 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  5537 000098A4 E83EEAFFFF          <1> 	call	find_first_file
  5538 000098A9 7256                <1> 	jc	short loc_load_mainprog_cfg_exit
  5539                              <1> 
  5540                              <1> 	;or	eax, eax
  5541                              <1> 	;jz	short loc_load_mainprog_cfg_exit
  5542                              <1> 
  5543                              <1> loc_start_mainprog_configuration:
  5544                              <1> 	; ESI = FindFile_DirEntry Location
  5545                              <1> 	; EAX = File Size
  5546                              <1> 
  5547 000098AB A3[74590100]        <1> 	mov	[MainProgCfg_FileSize], eax
  5548                              <1> 
  5549 000098B0 668B5614            <1> 	mov	dx, [esi+DirEntry_FstClusHI]
  5550 000098B4 C1E210              <1> 	shl	edx, 16
  5551 000098B7 668B561A            <1> 	mov	dx, [esi+DirEntry_FstClusLO]
  5552 000098BB 8915[A4640100]      <1> 	mov	[csftdf_sf_cluster], edx
  5553                              <1> 
  5554 000098C1 89C1                <1> 	mov	ecx, eax
  5555 000098C3 29C0                <1> 	sub	eax, eax
  5556                              <1> 
  5557                              <1> 	; TRDOS 386 (TRDOS v2.0)
  5558                              <1> 	; Allocate contiguous memory block for loading the file
  5559                              <1> 	
  5560                              <1> 	; eax = 0 (Allocate memory from the beginning)
  5561                              <1> 	; ecx = File (Allocation) size in bytes
  5562                              <1> 	
  5563 000098C5 E8B7BBFFFF          <1> 	call	allocate_memory_block
  5564 000098CA 7235                <1> 	jc	short loc_load_mainprog_cfg_exit
  5565                              <1> 
  5566 000098CC A3[9C640100]        <1> 	mov	[csftdf_sf_mem_addr], eax ; loading address
  5567 000098D1 890D[A0640100]      <1> 	mov	[csftdf_sf_mem_bsize], ecx ; block size
  5568                              <1> 
  5569 000098D7 31DB                <1> 	xor	ebx, ebx
  5570                              <1> 	;mov	[csftdf_sf_rbytes], ebx ; 0, reset
  5571                              <1> 
  5572 000098D9 8A3D[86590100]      <1> 	mov	bh, [Current_Drv] ; [FindFile_Drv]
  5573 000098DF BE00010900          <1> 	mov	esi, Logical_DOSDisks
  5574 000098E4 01DE                <1> 	add	esi, ebx
  5575                              <1> 
  5576 000098E6 8B1D[9C640100]      <1> 	mov	ebx, [csftdf_sf_mem_addr] ; memory block address
  5577                              <1> 
  5578 000098EC 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  5579 000098F0 7710                <1>         ja	short loc_mcfg_load_fat_file
  5580                              <1> 
  5581 000098F2 C705[AC640100]0000- <1> 	mov	dword [csftdf_r_size], 65536
  5581 000098FA 0100                <1>
  5582 000098FC E9A1010000          <1>         jmp     loc_mcfg_load_fs_file
  5583                              <1> 
  5584                              <1> loc_load_mainprog_cfg_exit:
  5585 00009901 C3                  <1> 	retn 
  5586                              <1> 
  5587                              <1> loc_mcfg_load_fat_file:
  5588 00009902 0FB74611            <1> 	movzx	eax, word [esi+LD_BPB+BytesPerSec]
  5589 00009906 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  5590 0000990A F7E1                <1> 	mul	ecx
  5591 0000990C A3[AC640100]        <1> 	mov	[csftdf_r_size], eax
  5592                              <1> 
  5593                              <1> loc_mcfg_load_fat_file_next:
  5594 00009911 E822010000          <1> 	call	mcfg_read_fat_file_sectors
  5595 00009916 0F8206010000        <1>         jc      mcfg_deallocate_mem
  5596                              <1> 
  5597 0000991C 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  5598 0000991E 74F1                <1> 	jz	short loc_mcfg_load_fat_file_next
  5599                              <1> 
  5600                              <1> loc_mcfg_load_fat_file_ok:
  5601                              <1> 	; 06/05/2016
  5602 00009920 C705[40650100]-     <1> 	mov	dword [mainprog_return_addr], loc_mcfg_ci_return_addr 
  5602 00009926 [E3990000]          <1>
  5603                              <1> 	;
  5604 0000992A 8B35[9C640100]      <1> 	mov	esi, [csftdf_sf_mem_addr]
  5605 00009930 8935[78590100]      <1> 	mov	[MainProgCfg_LineOffset], esi
  5606                              <1> 	
  5607 00009936 A1[74590100]        <1> 	mov	eax, [MainProgCfg_FileSize]
  5608 0000993B 89C2                <1> 	mov	edx, eax
  5609 0000993D 01F2                <1> 	add	edx, esi
  5610                              <1> 
  5611                              <1> loc_mcfg_process_next_line_check:
  5612 0000993F 89C1                <1> 	mov	ecx, eax
  5613                              <1> 
  5614 00009941 803E2A              <1> 	cmp	byte [esi], "*" ; Remark sign
  5615 00009944 7503                <1> 	jne	short loc_mcfg_process_next_line
  5616 00009946 46                  <1> 	inc	esi
  5617 00009947 EB17                <1> 	jmp	short loc_move_mainprog_cfg_nl1
  5618                              <1> 
  5619                              <1> loc_mcfg_process_next_line:
  5620 00009949 83F94F              <1> 	cmp	ecx, 79
  5621 0000994C 7605                <1> 	jna	short loc_start_mainprog_cfg_process
  5622                              <1> 	
  5623 0000994E B94F000000          <1> 	mov	ecx, 79 
  5624                              <1> 
  5625                              <1> loc_start_mainprog_cfg_process:
  5626 00009953 BF[365A0100]        <1> 	mov	edi, CommandBuffer
  5627                              <1> 
  5628                              <1> loc_move_mainprog_cfg_line:
  5629 00009958 AC                  <1> 	lodsb
  5630 00009959 3C20                <1> 	cmp	al, 20h
  5631 0000995B 720C                <1> 	jb	short loc_move_mainprog_cfg_nl2
  5632 0000995D AA                  <1> 	stosb
  5633 0000995E E2F8                <1> 	loop	loc_move_mainprog_cfg_line
  5634                              <1> 
  5635                              <1> loc_move_mainprog_cfg_nl1:
  5636 00009960 39D6                <1> 	cmp	esi, edx ; + configuration file size
  5637 00009962 7312                <1> 	jnb	short loc_end_of_mainprog_cfg_line
  5638 00009964 AC                  <1> 	lodsb
  5639 00009965 3C20                <1> 	cmp	al, 20h
  5640 00009967 73F7                <1> 	jnb	short loc_move_mainprog_cfg_nl1
  5641                              <1> 
  5642                              <1> loc_move_mainprog_cfg_nl2:
  5643 00009969 39D6                <1> 	cmp	esi, edx
  5644 0000996B 7309                <1> 	jnb	short loc_end_of_mainprog_cfg_line
  5645 0000996D 8A06                <1> 	mov	al, [esi]
  5646 0000996F 3C20                <1> 	cmp	al, 20h
  5647 00009971 7703                <1>  	ja	short loc_end_of_mainprog_cfg_line
  5648 00009973 46                  <1> 	inc	esi
  5649 00009974 EBF3                <1> 	jmp	short loc_move_mainprog_cfg_nl2	               
  5650                              <1> 
  5651                              <1> loc_end_of_mainprog_cfg_line:
  5652 00009976 C60700              <1> 	mov	byte [edi], 0
  5653                              <1> 
  5654 00009979 8935[78590100]      <1> 	mov	[MainProgCfg_LineOffset], esi
  5655                              <1> 
  5656                              <1> 	; 22/11/2017
  5657 0000997F BE[3E5A0100]        <1> 	mov	esi, CommandBuffer + 8
  5658 00009984 29FE                <1> 	sub	esi, edi
  5659 00009986 7606                <1> 	jna	short loc_move_mainprog_cfg_command
  5660 00009988 30C0                <1> 	xor	al, al
  5661                              <1> loc_mainprog_cfg_clear_chrs:
  5662 0000998A AA                  <1> 	stosb
  5663 0000998B 4E                  <1> 	dec	esi
  5664 0000998C 75FC                <1> 	jnz	short loc_mainprog_cfg_clear_chrs	
  5665                              <1> 
  5666                              <1> loc_move_mainprog_cfg_command:
  5667 0000998E BE[365A0100]        <1> 	mov	esi, CommandBuffer
  5668 00009993 89F7                <1> 	mov	edi, esi
  5669 00009995 31DB                <1> 	xor	ebx, ebx
  5670                              <1> 	;xor	ecx, ecx
  5671 00009997 30C9                <1> 	xor	cl, cl
  5672                              <1> 
  5673                              <1> loc_move_mcfg_first_cmd_char:
  5674 00009999 8A041E              <1> 	mov	al, [esi+ebx]
  5675 0000999C FEC3                <1> 	inc	bl 
  5676 0000999E 3C20                <1> 	cmp	al, 20h
  5677 000099A0 7712                <1> 	ja	short loc_move_mcfg_cmd_capitalizing
  5678 000099A2 7237                <1> 	jb	short loc_move_mcfg_cmd_arguments_ok
  5679 000099A4 80FB4F              <1> 	cmp	bl, 79
  5680 000099A7 72F0                <1> 	jb	short loc_move_mcfg_first_cmd_char
  5681 000099A9 EB30                <1> 	jmp	short loc_move_mcfg_cmd_arguments_ok
  5682                              <1> 
  5683                              <1> loc_move_mcfg_next_cmd_char:
  5684 000099AB 8A041E              <1> 	mov	al, [esi+ebx]
  5685 000099AE FEC3                <1> 	inc	bl
  5686 000099B0 3C20                <1> 	cmp	al, 20h
  5687 000099B2 7614                <1> 	jna	short loc_move_mcfg_cmd_ok
  5688                              <1> 
  5689                              <1> loc_move_mcfg_cmd_capitalizing:
  5690 000099B4 3C61                <1> 	cmp	al, 61h ; 'a'
  5691 000099B6 7206                <1> 	jb	short loc_move_mcfg_cmd_caps_ok
  5692 000099B8 3C7A                <1> 	cmp	al, 7Ah ; 'z'
  5693 000099BA 7702                <1> 	ja	short loc_move_mcfg_cmd_caps_ok
  5694 000099BC 24DF                <1> 	and	al, 0DFh ; sub	al, 'a'-'A'
  5695                              <1> 
  5696                              <1> loc_move_mcfg_cmd_caps_ok:
  5697 000099BE AA                  <1> 	stosb 
  5698 000099BF FEC1                <1> 	inc	cl
  5699 000099C1 80FB4F              <1> 	cmp	bl, 79
  5700 000099C4 72E5                <1> 	jb	short loc_move_mcfg_next_cmd_char
  5701 000099C6 EB13                <1> 	jmp	short loc_move_mcfg_cmd_arguments_ok
  5702                              <1> 
  5703                              <1> loc_move_mcfg_cmd_ok:
  5704 000099C8 30C0                <1> 	xor	al, al ; 0
  5705                              <1> 
  5706                              <1> loc_move_mcfg_cmd_arguments:
  5707 000099CA 8807                <1> 	mov	[edi], al
  5708 000099CC 47                  <1> 	inc	edi
  5709 000099CD 80FB4F              <1> 	cmp	bl, 79
  5710 000099D0 7309                <1> 	jnb	short loc_move_mcfg_cmd_arguments_ok
  5711 000099D2 8A041E              <1> 	mov	al, [esi+ebx]
  5712 000099D5 FEC3                <1> 	inc	bl
  5713 000099D7 3C20                <1> 	cmp	al, 20h
  5714 000099D9 73EF                <1> 	jnb	short loc_move_mcfg_cmd_arguments
  5715                              <1> 	
  5716                              <1> loc_move_mcfg_cmd_arguments_ok:
  5717 000099DB C60700              <1> 	mov	byte [edi], 0
  5718                              <1>        
  5719                              <1> loc_mcfg_process_cmd_interpreter:
  5720 000099DE E825E0FFFF          <1> 	call    command_interpreter
  5721                              <1> 
  5722                              <1> loc_mcfg_ci_return_addr: 
  5723 000099E3 A1[74590100]        <1> 	mov	eax, [MainProgCfg_FileSize]
  5724 000099E8 89C2                <1> 	mov	edx, eax
  5725 000099EA 8B35[78590100]      <1> 	mov	esi, [MainProgCfg_LineOffset]
  5726 000099F0 01F2                <1> 	add	edx, esi
  5727 000099F2 0305[9C640100]      <1> 	add	eax, [csftdf_sf_mem_addr]
  5728 000099F8 29F0                <1> 	sub	eax, esi
  5729 000099FA 0F873FFFFFFF        <1>         ja      loc_mcfg_process_next_line_check
  5730                              <1> 
  5731 00009A00 E81D000000          <1> 	call	mcfg_deallocate_mem
  5732                              <1>  
  5733 00009A05 B94F000000          <1>  	mov	ecx, 79 ; 80 ?
  5734 00009A0A BF[365A0100]        <1> 	mov	edi, CommandBuffer
  5735 00009A0F 30C0                <1> 	xor	al, al
  5736 00009A11 F3AA                <1> 	rep	stosb
  5737                              <1> 
  5738                              <1> 	; 06/05/2016
  5739 00009A13 BE[FF190100]        <1> 	mov	esi, nextline
  5740 00009A18 E8B0C9FFFF          <1> 	call	print_msg
  5741 00009A1D E963D6FFFF          <1> 	jmp	dos_prompt
  5742                              <1> 
  5743                              <1> mcfg_deallocate_mem:
  5744 00009A22 A1[9C640100]        <1> 	mov	eax, [csftdf_sf_mem_addr] ; start address
  5745 00009A27 8B0D[A0640100]      <1> 	mov	ecx, [csftdf_sf_mem_bsize] ; block size	
  5746                              <1> 	;call	deallocate_memory_block
  5747                              <1> 	;retn
  5748 00009A2D E95CBCFFFF          <1> 	jmp	deallocate_memory_block
  5749                              <1> 
  5750                              <1> mcfg_read_file_sectors:
  5751                              <1> 	; 14/04/2016
  5752 00009A32 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  5753 00009A36 7669                <1>         jna	short mcfg_read_fs_file_sectors
  5754                              <1> 
  5755                              <1> mcfg_read_fat_file_sectors:
  5756                              <1> 	; return:
  5757                              <1> 	;   CF = 0 & EDX > 0 -> END OF FILE
  5758                              <1> 	;   CF = 0 & EDX = 0 -> not EOF
  5759                              <1> 	;   CF = 1 -> read error (error code in AL)	
  5760                              <1> 
  5761                              <1> mcfg_read_fat_file_secs_0:
  5762 00009A38 8B15[74590100]      <1> 	mov	edx, [MainProgCfg_FileSize]
  5763 00009A3E 2B15[B4640100]      <1> 	sub	edx, [csftdf_sf_rbytes]
  5764 00009A44 3B15[AC640100]      <1> 	cmp	edx, [csftdf_r_size]	
  5765 00009A4A 7306                <1> 	jnb	short mcfg_read_fat_file_secs_1
  5766 00009A4C 8915[AC640100]      <1> 	mov	[csftdf_r_size], edx
  5767                              <1> 		
  5768                              <1> mcfg_read_fat_file_secs_1:
  5769 00009A52 A1[AC640100]        <1> 	mov	eax, [csftdf_r_size]
  5770 00009A57 29D2                <1> 	sub	edx, edx
  5771 00009A59 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec]
  5772 00009A5D 01C8                <1> 	add	eax, ecx
  5773 00009A5F 48                  <1> 	dec	eax
  5774 00009A60 F7F1                <1> 	div	ecx
  5775 00009A62 89C1                <1> 	mov	ecx, eax ; sector count
  5776 00009A64 A1[A4640100]        <1> 	mov	eax, [csftdf_sf_cluster]
  5777                              <1> 
  5778                              <1> 	; EBX = memory block address (current)
  5779                              <1> 	
  5780 00009A69 E88C230000          <1> 	call	read_fat_file_sectors
  5781 00009A6E 7230                <1> 	jc	short mcfg_read_fat_file_secs_3
  5782                              <1> 
  5783                              <1> 	; EBX = next memory address
  5784                              <1> 
  5785 00009A70 A1[B4640100]        <1> 	mov	eax, [csftdf_sf_rbytes]
  5786 00009A75 0305[AC640100]      <1> 	add	eax, [csftdf_r_size]
  5787 00009A7B 8B15[74590100]      <1> 	mov	edx, [MainProgCfg_FileSize]
  5788 00009A81 39D0                <1> 	cmp	eax, edx
  5789 00009A83 731B                <1> 	jnb	short mcfg_read_fat_file_secs_3 ; edx > 0
  5790 00009A85 A3[B4640100]        <1> 	mov	[csftdf_sf_rbytes], eax
  5791                              <1> 
  5792 00009A8A 53                  <1> 	push	ebx ; *
  5793                              <1> 	; get next cluster (csftdf_r_size! bytes)
  5794 00009A8B A1[A4640100]        <1> 	mov	eax, [csftdf_sf_cluster]
  5795 00009A90 E837210000          <1> 	call	get_next_cluster
  5796 00009A95 5B                  <1> 	pop	ebx ; *
  5797 00009A96 7301                <1> 	jnc	short mcfg_read_fat_file_secs_2
  5798                              <1> 
  5799                              <1> 	;mov	eax, 17; Read error !
  5800 00009A98 C3                  <1> 	retn
  5801                              <1> 
  5802                              <1> mcfg_read_fat_file_secs_2:
  5803 00009A99 29D2                <1> 	sub	edx, edx ; 0
  5804 00009A9B A3[A4640100]        <1> 	mov	[csftdf_sf_cluster], eax ; next cluster
  5805                              <1> 
  5806                              <1> mcfg_read_fat_file_secs_3:
  5807 00009AA0 C3                  <1> 	retn
  5808                              <1> 
  5809                              <1> mcfg_read_fs_file_sectors:
  5810 00009AA1 C3                  <1> 	retn
  5811                              <1> 
  5812                              <1> loc_mcfg_load_fs_file:
  5813 00009AA2 C3                  <1> 	retn
  5814                              <1> 
  5815                              <1> load_and_execute_file:
  5816                              <1> 	; 04/01/2017
  5817                              <1> 	; 06/05/2016, 07/05/2016, 11/05/2016
  5818                              <1> 	; 23/04/2016, 24/04/2016
  5819                              <1> 	; 22/04/2016 (TRDOS 386 = TRDOS v2.0)
  5820                              <1> 	; 05/11/2011 
  5821                              <1> 	; (TRDOS v1, CMDINTR.ASM, 'cmp_cmd_run', 'cmp_cmd_external')
  5822                              <1> 	; ('loc_run_check_filename')
  5823                              <1> 	; 29/08/2011
  5824                              <1> 	; 10/09/2011
  5825                              <1> 	; INPUT->
  5826                              <1> 	;	ESI = Path Name address (CommandBuffer address)
  5827                              <1> 	; OUTPUT ->
  5828                              <1> 	;	none (error message will be shown if an error will occur)
  5829                              <1> 	;
  5830                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI, EBP will be changed) 
  5831                              <1> 	;
  5832                              <1> loc_run_check_filename:
  5833 00009AA3 803E20              <1> 	cmp	byte [esi], 20h
  5834 00009AA6 0F822BE3FFFF        <1> 	jb	loc_cmd_failed
  5835 00009AAC 7703                <1> 	ja	short loc_run_check_filename_ok
  5836 00009AAE 46                  <1> 	inc	esi
  5837 00009AAF EBF2                <1> 	jmp	short loc_run_check_filename
  5838                              <1> 
  5839                              <1> loc_run_check_filename_ok:
  5840 00009AB1 C605[E7590100]00    <1> 	mov	byte [CmdArgStart], 0 ; reset
  5841 00009AB8 56                  <1> 	push	esi ; *
  5842                              <1> loc_run_get_first_arg_pos:
  5843 00009AB9 46                  <1> 	inc	esi
  5844 00009ABA 8A06                <1> 	mov	al, [esi]
  5845 00009ABC 3C20                <1> 	cmp	al, 20h
  5846 00009ABE 77F9                <1> 	ja	short loc_run_get_first_arg_pos
  5847 00009AC0 C60600              <1> 	mov	byte [esi], 0
  5848                              <1> loc_run_get_external_arg_pos:
  5849                              <1> 	; 11/05/2016
  5850 00009AC3 46                  <1> 	inc	esi
  5851 00009AC4 8A06                <1> 	mov	al, [esi]
  5852 00009AC6 3C20                <1> 	cmp	al, 20h
  5853 00009AC8 760C                <1> 	jna	short loc_run_parse_path_name
  5854 00009ACA 89F0                <1> 	mov	eax, esi
  5855 00009ACC 2D[365A0100]        <1> 	sub	eax, CommandBuffer
  5856 00009AD1 A2[E7590100]        <1> 	mov	byte [CmdArgStart], al
  5857                              <1> loc_run_parse_path_name:
  5858 00009AD6 5E                  <1> 	pop	esi ; *
  5859 00009AD7 BF[26620100]        <1> 	mov	edi, FindFile_Drv
  5860 00009ADC E8D7090000          <1> 	call	parse_path_name
  5861 00009AE1 0F82F0E2FFFF        <1> 	jc	loc_cmd_failed
  5862                              <1> 
  5863                              <1> loc_run_check_filename_exists:
  5864 00009AE7 BE[68620100]        <1> 	mov	esi, FindFile_Name
  5865 00009AEC 803E20              <1> 	cmp	byte [esi], 20h
  5866 00009AEF 0F86E2E2FFFF        <1> 	jna	loc_cmd_failed
  5867                              <1> 
  5868                              <1> loc_run_check_exe_filename_ext:
  5869 00009AF5 E890020000          <1> 	call	check_prg_filename_ext
  5870 00009AFA 0F82D7E2FFFF        <1> 	jc	loc_cmd_failed
  5871                              <1> 	
  5872                              <1> loc_run_check_exe_filename_ext_ok:
  5873 00009B00 66A3[3E650100]      <1> 	mov	word [EXE_ID], ax
  5874                              <1> 
  5875                              <1> loc_run_drv:
  5876 00009B06 C605[3D650100]00    <1> 	mov	byte [Run_Manual_Path], 0
  5877 00009B0D A1[80590100]        <1> 	mov	eax, [Current_Dir_FCluster]
  5878 00009B12 A3[38650100]        <1>         mov     [Run_CDirFC], eax
  5879                              <1> 	;
  5880 00009B17 8A35[86590100]      <1> 	mov	dh, [Current_Drv]
  5881 00009B1D 8835[E2600100]      <1> 	mov	[RUN_CDRV], dh
  5882                              <1> 
  5883 00009B23 8A15[26620100]      <1> 	mov	dl, [FindFile_Drv]
  5884 00009B29 38F2                <1> 	cmp	dl, dh
  5885 00009B2B 7412                <1> 	je	short loc_run_change_directory
  5886                              <1>                
  5887 00009B2D 8005[3D650100]02    <1> 	add	byte [Run_Manual_Path], 2
  5888                              <1> 
  5889 00009B34 E80BD4FFFF          <1> 	call	change_current_drive
  5890 00009B39 0F82C3E2FFFF        <1> 	jc	loc_run_cmd_failed
  5891                              <1> 
  5892                              <1> loc_run_change_directory:
  5893 00009B3F 803D[27620100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  5894 00009B46 7623                <1> 	jna	short loc_run_find_executable_file
  5895                              <1> 
  5896 00009B48 FE05[3D650100]      <1> 	inc	byte [Run_Manual_Path]
  5897                              <1>      
  5898 00009B4E FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  5899                              <1> 
  5900 00009B54 BE[27620100]        <1> 	mov	esi, FindFile_Directory
  5901 00009B59 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  5902 00009B5B E842030000          <1> 	call	change_current_directory
  5903 00009B60 0F829CE2FFFF        <1> 	jc	loc_run_cmd_failed
  5904                              <1> 
  5905                              <1> loc_run_change_prompt_dir_string:
  5906 00009B66 E857020000          <1> 	call	change_prompt_dir_string
  5907                              <1> 
  5908                              <1> loc_run_find_executable_file:
  5909 00009B6B 66C705[3C650100]00- <1> 	mov	word [Run_Auto_Path], 0
  5909 00009B73 00                  <1>
  5910                              <1> 
  5911                              <1> loc_run_find_executable_file_next:
  5912 00009B74 BE[68620100]        <1> 	mov	esi, FindFile_Name
  5913                              <1> loc_run_find_program_file_next:
  5914 00009B79 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  5915 00009B7D E865E7FFFF          <1> 	call	find_first_file
  5916                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
  5917                              <1> 	; EDI = Directory Buffer Directory Entry Location
  5918                              <1> 	; EAX = File size
  5919 00009B82 0F835C010000        <1> 	jnc	loc_load_and_run_file
  5920                              <1> 	 
  5921 00009B88 3C02                <1> 	cmp	al, 2 ; file not found
  5922 00009B8A 0F8572E2FFFF        <1> 	jne	loc_run_cmd_failed
  5923                              <1> 
  5924 00009B90 66A1[3E650100]      <1> 	mov	ax, word [EXE_ID]
  5925 00009B96 80FC2E              <1> 	cmp	ah, '.' ; File name has extension sign
  5926 00009B99 7424                <1> 	je	short loc_run_check_auto_path
  5927                              <1> 
  5928 00009B9B 08C0                <1> 	or	al, al
  5929 00009B9D 7520                <1> 	jnz	short loc_run_check_auto_path
  5930                              <1> 
  5931 00009B9F 80FC08              <1> 	cmp	ah, 8 ; count of file name chars
  5932 00009BA2 771B                <1> 	ja	short loc_run_check_auto_path
  5933                              <1> 
  5934                              <1> loc_run_change_file_ext_to_prg:
  5935 00009BA4 0FB6DC              <1> 	movzx	ebx, ah ; count of file name chars
  5936 00009BA7 BE[68620100]        <1> 	mov	esi, FindFile_Name
  5937 00009BAC 01F3                <1> 	add	ebx, esi	
  5938                              <1> 	; 07/05/2016
  5939 00009BAE C7032E505247        <1> 	mov	dword [ebx],  '.PRG'
  5940 00009BB4 66C705[3E650100]50- <1> 	mov	word [EXE_ID], 'P.'
  5940 00009BBC 2E                  <1>
  5941 00009BBD EBBA                <1> 	jmp	short loc_run_find_program_file_next	
  5942                              <1> 
  5943                              <1> loc_run_check_auto_path:
  5944                              <1> 	; NOTE: /// 07/05/2016 ///
  5945                              <1> 	; If the path is given, value of byte [Run_Manual_Path]
  5946                              <1> 	; will not be ZERO. If so, file searching by using
  5947                              <1> 	; Automatic Path (via 'PATH' environment variable)
  5948                              <1> 	; will not be applicable, because the program file 
  5949                              <1> 	; is already/absolutely not found.
  5950                              <1> 
  5951 00009BBF A0[3D650100]        <1> 	mov	al, [Run_Manual_Path]
  5952 00009BC4 08C0                <1> 	or	al, al
  5953 00009BC6 0F850BE2FFFF        <1> 	jnz	loc_cmd_failed
  5954                              <1> 
  5955                              <1> loc_run_check_auto_path_again:
  5956 00009BCC 66833D[3C650100]FF  <1> 	cmp	word [Run_Auto_Path], 0FFFFh		 
  5957                              <1> 		; 0FFFFh = Not a valid run path (in ENV block) 
  5958 00009BD4 0F83FDE1FFFF        <1> 	jnb	loc_cmd_failed
  5959                              <1> 	; xor	al, al 
  5960 00009BDA BE[2E0E0100]        <1> 	mov	esi, Cmd_Path ; 'PATH'
  5961 00009BDF BF[865A0100]        <1> 	mov	edi, TextBuffer
  5962 00009BE4 E848F9FFFF          <1> 	call	get_environment_string
  5963 00009BE9 730E                <1> 	jnc	short loc_run_chk_filename_ext_again
  5964 00009BEB 66C705[3C650100]FF- <1> 	mov	word [Run_Auto_Path], 0FFFFh ; invalid
  5964 00009BF3 FF                  <1>
  5965 00009BF4 E9DEE1FFFF          <1> 	jmp	loc_cmd_failed
  5966                              <1> 
  5967                              <1> loc_run_chk_filename_ext_again:
  5968 00009BF9 89C1                <1> 	mov	ecx, eax ; string length (with zero tail)
  5969 00009BFB 49                  <1> 	dec	ecx ; without zero tail
  5970 00009BFC 66A1[3E650100]      <1> 	mov	ax, [EXE_ID]
  5971 00009C02 80FC2E              <1> 	cmp	ah, '.'
  5972 00009C05 740E                <1> 	je	short loc_run_chk_auto_path_pos
  5973                              <1> 	 
  5974                              <1> loc_run_change_file_ext_to_noext_again:
  5975 00009C07 0FB6DC              <1> 	movzx	ebx, ah
  5976 00009C0A BE[68620100]        <1> 	mov	esi, FindFile_Name
  5977 00009C0F 01F3                <1> 	add 	ebx, esi
  5978 00009C11 29C0                <1> 	sub	eax, eax
  5979 00009C13 8903                <1> 	mov	[ebx], eax ; 0 ; erase extension (.PRG)
  5980                              <1> 
  5981                              <1> loc_run_chk_auto_path_pos:
  5982                              <1> 	;movzx	eax,  word [Run_Auto_Path]
  5983 00009C15 66A1[3C650100]      <1> 	mov	ax, [Run_Auto_Path]
  5984 00009C1B 39C8                <1> 	cmp	eax, ecx ; ecx = string length (except zero tail)
  5985 00009C1D 0F83B4E1FFFF        <1> 	jnb	loc_cmd_failed
  5986                              <1> 	;or	eax, eax
  5987 00009C23 6609C0              <1> 	or	ax, ax
  5988 00009C26 7502                <1> 	jnz	short loc_run_auto_path_pos_move
  5989 00009C28 B005                <1> 	mov	al, 5
  5990                              <1> 
  5991                              <1> loc_run_auto_path_pos_move:
  5992 00009C2A 89FE                <1> 	mov	esi, edi ; offset TextBuffer
  5993 00009C2C 01C6                <1> 	add	esi, eax
  5994                              <1> 
  5995                              <1> loc_run_auto_path_pos_space_loop:
  5996 00009C2E AC                  <1> 	lodsb
  5997 00009C2F 3C20                <1> 	cmp	al, 20h 
  5998 00009C31 74FB                <1> 	je	short loc_run_auto_path_pos_space_loop
  5999 00009C33 0F829EE1FFFF        <1> 	jb	loc_cmd_failed 
  6000 00009C39 AA                  <1> 	stosb
  6001                              <1> loc_run_auto_path_pos_move_next: 
  6002 00009C3A AC                  <1> 	lodsb
  6003 00009C3B 3C3B                <1> 	cmp	al, ';'
  6004 00009C3D 7414                <1> 	je	short loc_run_auto_path_pos_move_last_byte
  6005 00009C3F 3C20                <1> 	cmp	al, 20h
  6006 00009C41 74F7                <1> 	je	short loc_run_auto_path_pos_move_next
  6007 00009C43 7203                <1> 	jb	short loc_byte_ptr_end_of_path
  6008 00009C45 AA                  <1> 	stosb
  6009 00009C46 EBF2                <1> 	jmp	short loc_run_auto_path_pos_move_next 
  6010                              <1> 
  6011                              <1> loc_byte_ptr_end_of_path: 
  6012 00009C48 66C705[3C650100]FF- <1> 	mov	word [Run_Auto_Path], 0FFFFh ; end of path
  6012 00009C50 FF                  <1>
  6013 00009C51 EB0D                <1> 	jmp	short loc_run_auto_path_move_ok 
  6014                              <1> 
  6015                              <1> loc_run_auto_path_pos_move_last_byte:
  6016 00009C53 89F0                <1> 	mov	eax, esi
  6017 00009C55 2D[865A0100]        <1> 	sub	eax, TextBuffer 
  6018 00009C5A 66A3[3C650100]      <1> 	mov	[Run_Auto_Path], ax ; next path position
  6019                              <1> 
  6020                              <1> loc_run_auto_path_move_ok:
  6021 00009C60 4F                  <1> 	dec	edi
  6022 00009C61 B02F                <1> 	mov	al, '/'
  6023 00009C63 3807                <1> 	cmp	[edi], al
  6024 00009C65 7403                <1> 	je	short loc_run_auto_path_move_file_name
  6025 00009C67 47                  <1> 	inc	edi
  6026 00009C68 8807                <1> 	mov	[edi], al
  6027                              <1> 
  6028                              <1> loc_run_auto_path_move_file_name:
  6029 00009C6A 47                  <1> 	inc	edi   
  6030 00009C6B BE[68620100]        <1> 	mov	esi, FindFile_Name
  6031                              <1> 
  6032                              <1> loc_run_auto_path_move_fn_loop:
  6033 00009C70 AC                  <1> 	lodsb
  6034 00009C71 AA                  <1> 	stosb
  6035 00009C72 08C0                <1> 	or	al, al
  6036 00009C74 75FA                <1> 	jnz	short loc_run_auto_path_move_fn_loop
  6037                              <1> 
  6038 00009C76 BE[865A0100]        <1> 	mov	esi, TextBuffer
  6039 00009C7B BF[26620100]        <1> 	mov	edi, FindFile_Drv
  6040 00009C80 E833080000          <1> 	call	parse_path_name
  6041 00009C85 0F824CE1FFFF        <1> 	jc	loc_cmd_failed
  6042                              <1> 
  6043 00009C8B 8A35[86590100]      <1> 	mov	dh, [Current_Drv]
  6044 00009C91 8A15[26620100]      <1> 	mov	dl, [FindFile_Drv]
  6045 00009C97 38F2                <1> 	cmp	dl, dh
  6046 00009C99 740B                <1> 	je	short loc_run_change_directory_again
  6047                              <1>                
  6048 00009C9B E8A4D2FFFF          <1> 	call	change_current_drive
  6049 00009CA0 0F825CE1FFFF        <1> 	jc	loc_run_cmd_failed
  6050                              <1> 
  6051                              <1> loc_run_change_directory_again:
  6052 00009CA6 803D[27620100]20    <1> 	cmp	byte [FindFile_Directory], 20h
  6053 00009CAD 761D                <1> 	jna	short loc_load_executable_cdir_chk_again
  6054                              <1> 
  6055 00009CAF FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  6056 00009CB5 BE[27620100]        <1> 	mov	esi, FindFile_Directory
  6057 00009CBA 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  6058 00009CBC E8E1010000          <1> 	call	change_current_directory
  6059 00009CC1 0F823BE1FFFF        <1> 	jc	loc_run_cmd_failed
  6060                              <1> 
  6061                              <1> loc_run_chg_prompt_dir_str_again:
  6062 00009CC7 E8F6000000          <1> 	call	change_prompt_dir_string
  6063                              <1> 
  6064                              <1> loc_load_executable_cdir_chk_again:
  6065 00009CCC A1[80590100]        <1> 	mov	eax, [Current_Dir_FCluster]
  6066 00009CD1 3B05[38650100]      <1> 	cmp	eax, [Run_CDirFC]
  6067 00009CD7 0F8597FEFFFF        <1> 	jne	loc_run_find_executable_file_next
  6068 00009CDD 30C0                <1> 	xor	al, al ; 0
  6069 00009CDF E9E8FEFFFF          <1> 	jmp	loc_run_check_auto_path_again
  6070                              <1> 
  6071                              <1> loc_load_and_run_file:
  6072                              <1> 	; 13/11/2017
  6073                              <1> 	; 04/01/2017
  6074                              <1> 	; 23/04/2016
  6075 00009CE4 BE[68620100]        <1> 	mov	esi, FindFile_Name
  6076 00009CE9 BF[865A0100]        <1> 	mov	edi, TextBuffer
  6077                              <1> 
  6078                              <1>  	; 24/04/2016
  6079 00009CEE 31D2                <1> 	xor	edx, edx
  6080 00009CF0 668915[4A040300]    <1> 	mov	word [argc], dx ; 0
  6081 00009CF7 8915[8C030300]      <1> 	mov	dword [u.nread], edx ; 0
  6082                              <1> 
  6083                              <1> loc_load_and_run_file_1:
  6084 00009CFD AC                  <1> 	lodsb	
  6085 00009CFE AA                  <1> 	stosb
  6086 00009CFF FF05[8C030300]      <1> 	inc	dword [u.nread]
  6087 00009D05 20C0                <1> 	and	al, al
  6088 00009D07 75F4                <1> 	jnz 	short loc_load_and_run_file_1
  6089                              <1> 	
  6090 00009D09 A0[E7590100]        <1> 	mov	al, [CmdArgStart]
  6091 00009D0E 20C0                <1> 	and	al, al
  6092 00009D10 7445                <1> 	jz	short loc_load_and_run_file_7
  6093                              <1> 
  6094 00009D12 0FB6F0              <1> 	movzx	esi, al ; 11/05/2016
  6095 00009D15 B950000000          <1> 	mov	ecx, 80
  6096 00009D1A 29F1                <1> 	sub	ecx, esi
  6097 00009D1C 81C6[365A0100]      <1> 	add	esi, CommandBuffer
  6098                              <1> 
  6099 00009D22 66FF05[4A040300]    <1> 	inc	word [argc] ; 11/05/2016
  6100                              <1> 
  6101                              <1> loc_load_and_run_file_2:
  6102 00009D29 AC                  <1> 	lodsb
  6103 00009D2A 3C20                <1> 	cmp	al, 20h
  6104 00009D2C 7717                <1> 	ja	short loc_load_and_run_file_5	
  6105 00009D2E 721E                <1> 	jb	short loc_load_and_run_file_6
  6106                              <1> 
  6107                              <1> loc_load_and_run_file_3:
  6108 00009D30 803E20              <1> 	cmp	byte [esi], 20h
  6109 00009D33 7707                <1> 	ja	short loc_load_and_run_file_4
  6110 00009D35 7217                <1> 	jb	short loc_load_and_run_file_6
  6111 00009D37 46                  <1> 	inc	esi
  6112 00009D38 E2F6                <1> 	loop	loc_load_and_run_file_3
  6113 00009D3A EB12                <1> 	jmp	short loc_load_and_run_file_6
  6114                              <1> 
  6115                              <1> loc_load_and_run_file_4:
  6116 00009D3C 28C0                <1> 	sub	al, al ; 0
  6117 00009D3E 66FF05[4A040300]    <1> 	inc	word [argc]
  6118                              <1> loc_load_and_run_file_5:
  6119 00009D45 AA                  <1> 	stosb
  6120 00009D46 FF05[8C030300]      <1> 	inc	dword [u.nread]
  6121 00009D4C E2DB                <1> 	loop	loc_load_and_run_file_2
  6122                              <1> 			
  6123                              <1> loc_load_and_run_file_6:
  6124 00009D4E 30C0                <1> 	xor	al, al ; 0
  6125 00009D50 AA                  <1> 	stosb
  6126 00009D51 FF05[8C030300]      <1> 	inc	dword [u.nread]
  6127                              <1> loc_load_and_run_file_7:
  6128 00009D57 8807                <1> 	mov 	[edi], al ; 0
  6129 00009D59 66FF05[4A040300]    <1> 	inc	word [argc] ; 24/04/2016
  6130 00009D60 FF05[8C030300]      <1> 	inc	dword [u.nread] ; 24/04/2016
  6131 00009D66 BE[865A0100]        <1> 	mov	esi, TextBuffer
  6132 00009D6B 8B15[94620100]      <1> 	mov	edx, [FindFile_DirEntry+DirEntry_FileSize]
  6133 00009D71 66A1[8C620100]      <1> 	mov	ax, [FindFile_DirEntry+DirEntry_FstClusHI]
  6134 00009D77 C1E010              <1> 	shl	eax, 16 ; 13/11/2017
  6135 00009D7A 66A1[92620100]      <1> 	mov	ax, [FindFile_DirEntry+DirEntry_FstClusLO]
  6136                              <1> 	; EAX = First Cluster number
  6137                              <1> 	; EDX = File Size
  6138                              <1> 	; ESI = Argument list address
  6139                              <1> 	; [argc] = argument count
  6140                              <1> 	; [u.nread] = argument list length
  6141 00009D80 E89D420000          <1> 	call	load_and_run_file ; trdosk6.s
  6142                              <1>         ;jc	loc_run_cmd_failed ; 04/01/2017
  6143                              <1> loc_load_and_run_file_8: ; 06/05/2016
  6144 00009D85 E98BE9FFFF          <1> 	jmp	loc_file_rw_restore_retn
  6145                              <1> 
  6146                              <1> check_prg_filename_ext:
  6147                              <1> 	; 23/04/2016 (TRDOS 386 = TRDOS v2.0)
  6148                              <1> 	; 10/09/2011 
  6149                              <1> 	; (TRDOS v1, CMDINTR.ASM, 'proc_check_exe_filename_ext')
  6150                              <1> 	; 14/11/2009
  6151                              <1> 	; INPUT -> 
  6152                              <1> 	;	ESI = Dot File Name
  6153                              <1> 	; OUTPUT ->
  6154                              <1> 	;     cf = 0 -> EXE_ID in AL
  6155                              <1> 	;	ESI = Last char + 1 position
  6156                              <1> 	;     cf = 1 -> Invalid executable file name
  6157                              <1> 	;	or no file name extension if AH<=8
  6158                              <1> 	;	AL = Last file name char     
  6159                              <1> 	;     cf = 0 -> AL='P' (PRG), AL=0 (no extension)
  6160                              <1> 	;
  6161                              <1> 	; (Modified registers: EAX, ESI)
  6162                              <1>   
  6163 00009D8A 30E4                <1> 	xor	ah, ah
  6164                              <1> loc_run_check_filename_ext:	
  6165 00009D8C AC                  <1> 	lodsb
  6166 00009D8D 3C21                <1> 	cmp	al, 21h
  6167 00009D8F 7229                <1> 	jb	short loc_check_exe_fn_retn 
  6168 00009D91 FEC4                <1> 	inc	ah
  6169 00009D93 3C2E                <1> 	cmp	al, '.'
  6170 00009D95 75F5                <1> 	jne	short loc_run_check_filename_ext	
  6171                              <1> 		 
  6172                              <1> loc_run_check_filename_ext_dot:
  6173 00009D97 80FC02              <1> 	cmp	ah, 2 ; .??? is not valid
  6174 00009D9A 88C4                <1> 	mov	ah, al ; '.' 
  6175 00009D9C 7219                <1> 	jb	short loc_check_prg_fn_retn
  6176                              <1> 
  6177                              <1> loc_run_check_filename_ext_dot_ok:
  6178 00009D9E AC                  <1> 	lodsb
  6179 00009D9F 24DF                <1> 	and	al, 0DFh 
  6180                              <1> 
  6181                              <1> loc_run_check_filename_ext_prg:
  6182 00009DA1 3C50                <1> 	cmp	al, 'P'
  6183 00009DA3 7212                <1> 	jb	short loc_check_prg_fn_retn
  6184 00009DA5 7711                <1> 	ja	short loc_check_prg_fn_stc
  6185 00009DA7 AC                  <1> 	lodsb
  6186 00009DA8 24DF                <1> 	and	al, 0DFh 
  6187 00009DAA 3C52                <1> 	cmp	al, 'R'
  6188 00009DAC 750A                <1> 	jne	short loc_check_prg_fn_stc
  6189 00009DAE AC                  <1> 	lodsb
  6190 00009DAF 24DF                <1> 	and	al, 0DFh
  6191 00009DB1 3C47                <1> 	cmp	al, 'G'
  6192 00009DB3 7503                <1> 	jne	short loc_check_prg_fn_stc
  6193                              <1> 
  6194 00009DB5 B050                <1> 	mov	al, 'P'
  6195                              <1> loc_check_prg_fn_retn:
  6196 00009DB7 C3                  <1> 	retn
  6197                              <1> 
  6198                              <1> loc_check_prg_fn_stc:
  6199 00009DB8 F9                  <1> 	stc
  6200 00009DB9 C3                  <1> 	retn
  6201                              <1>  
  6202                              <1> loc_check_exe_fn_retn:
  6203 00009DBA 28C0                <1> 	sub	al, al ; 0
  6204 00009DBC C3                  <1> 	retn
  6205                              <1>               
  6206                              <1> find_and_list_files:
  6207 00009DBD C3                  <1> 	retn
  6208                              <1> set_exec_arguments:
  6209 00009DBE C3                  <1> 	retn
  6210                              <1> delete_fs_directory:
  6211 00009DBF 31C0                <1> 	xor eax, eax
  6212 00009DC1 C3                  <1> 	retn
  2308                                  %include 'trdosk4.s' ; 24/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - Directory Functions : trdosk4.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 29/12/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; DIR.ASM (09/10/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> 
    14                              <1> ; DIR.ASM  [ TRDOS KERNEL - COMMAND EXECUTER SECTION - DIRECTORY FUNCTIONS ]
    15                              <1> ; (c) 2004-2010  Erdogan TAN  [ 17/01/2004 ]  Last Update: 09/10/2011
    16                              <1> ; FILE.ASM [ FILE FUNCTIONS ] Last Update: 09/10/2011
    17                              <1> 
    18                              <1> change_prompt_dir_string:
    19                              <1> 	; 05/10/2016
    20                              <1> 	; 24/01/2016 (TRDOS 386 = TRDOS v2.0)
    21                              <1> 	; 27/03/2011
    22                              <1> 	; 09/10/2009
    23                              <1> 	; INPUT/OUTPUT => none
    24                              <1> 	; this procedure changes current directory string/text  
    25                              <1> 	; 2005
    26                              <1> 
    27 00009DC2 BE[E3600100]        <1> 	mov	esi, PATH_Array
    28                              <1> change_prompt_dir_str: ; 05/10/2016 (call from 'set_working_path')
    29 00009DC7 BF[8A590100]        <1> 	mov	edi, Current_Directory
    30 00009DCC 8A25[84590100]      <1> 	mov	ah, [Current_Dir_Level]
    31 00009DD2 E807000000          <1> 	call	set_current_directory_string
    32 00009DD7 880D[E5590100]      <1> 	mov	[Current_Dir_StrLen], cl
    33                              <1> 
    34 00009DDD C3                  <1> 	retn
    35                              <1> 
    36                              <1> set_current_directory_string:
    37                              <1> 	; 24/01/2016 (TRDOS 386 = TRDOS v2.0)
    38                              <1> 	; 27/03/2011
    39                              <1> 	; 09/10/2009
    40                              <1> 	; INPUT:
    41                              <1> 	;    ESI = Path Array Address 
    42                              <1> 	;    EDI = Current Directory String Buffer
    43                              <1> 	;    AH = Current Directory Level
    44                              <1> 	; OUTPUT => EAX, EBX, ESI will be changed
    45                              <1> 	;    EDI will be same with input
    46                              <1> 	;    ECX = Current Directory String Length 
    47                              <1> 
    48 00009DDE 57                  <1> 	push    edi
    49 00009DDF 80FC00              <1> 	cmp     ah, 0
    50 00009DE2 7652                <1> 	jna	short pass_write_path
    51 00009DE4 83C610              <1> 	add	esi, 16
    52 00009DE7 89F3                <1> 	mov	ebx, esi
    53                              <1> loc_write_path:
    54 00009DE9 B908000000          <1> 	mov	ecx, 8
    55                              <1> path_write_dirname1:
    56 00009DEE AC                  <1> 	lodsb
    57 00009DEF 3C20                <1> 	cmp	al, 20h
    58 00009DF1 7612                <1> 	jna	short pass_write_dirname1
    59 00009DF3 AA                  <1> 	stosb
    60 00009DF4 81FF[E4590100]      <1> 	cmp	edi, End_Of_Current_Dir_Str
    61 00009DFA 733A                <1> 	jnb	short pass_write_path
    62 00009DFC E2F0                <1> 	loop	path_write_dirname1
    63 00009DFE 803E20              <1> 	cmp	byte [esi], 20h
    64 00009E01 7624                <1> 	jna	short pass_write_dirname2
    65 00009E03 EB0A                <1> 	jmp     short loc_put_dot_cont_ext
    66                              <1> pass_write_dirname1:
    67 00009E05 89DE                <1> 	mov	esi, ebx
    68 00009E07 83C608              <1> 	add	esi, 8
    69 00009E0A 803E20              <1> 	cmp	byte [esi], 20h
    70 00009E0D 7618                <1> 	jna	short pass_write_dirname2
    71                              <1> loc_put_dot_cont_ext:
    72 00009E0F C6072E              <1> 	mov	byte [edi], "."
    73                              <1> 	;mov	ecx, 3
    74 00009E12 B103                <1> 	mov	cl, 3
    75                              <1> loc_check_dir_name_ext:
    76 00009E14 AC                  <1> 	lodsb
    77 00009E15 47                  <1> 	inc	edi
    78 00009E16 3C20                <1> 	cmp	al, 20h
    79 00009E18 760D                <1> 	jna	short pass_write_dirname2
    80 00009E1A 8807                <1> 	mov	[edi], al
    81 00009E1C 81FF[E4590100]      <1> 	cmp	edi, End_Of_Current_Dir_Str
    82 00009E22 7312                <1> 	jnb	short pass_write_path
    83 00009E24 E2EE                <1> 	loop    loc_check_dir_name_ext
    84 00009E26 47                  <1> 	inc	edi
    85                              <1> pass_write_dirname2:
    86 00009E27 FECC                <1> 	dec	ah
    87 00009E29 740B                <1> 	jz      short pass_write_path
    88 00009E2B 83C310              <1> 	add	ebx, 16
    89 00009E2E 89DE                <1> 	mov	esi, ebx
    90 00009E30 C6072F              <1> 	mov	byte [edi],"/"
    91 00009E33 47                  <1> 	inc	edi
    92 00009E34 EBB3                <1> 	jmp	short loc_write_path
    93                              <1> pass_write_path:
    94 00009E36 C60700              <1> 	mov	byte [edi], 0
    95 00009E39 47                  <1> 	inc	edi
    96 00009E3A 89F9                <1> 	mov	ecx, edi
    97 00009E3C 5F                  <1> 	pop	edi
    98 00009E3D 29F9                <1> 	sub	ecx, edi
    99                              <1> 	; ECX = Current Directory String Length
   100 00009E3F C3                  <1> 	retn
   101                              <1> 
   102                              <1> get_current_directory:
   103                              <1> 	; 15/10/2016
   104                              <1> 	; 14/02/2016
   105                              <1> 	; 24/01/2016 (TRDOS 386 = TRDOS v2.0)
   106                              <1> 	; 27/03/2011
   107                              <1> 	;
   108                              <1> 	; INPUT-> ESI = Current Directory Buffer
   109                              <1> 	;         DL = TRDOS Logical Dos Drive Number + 1
   110                              <1> 	;              (0= Default/Current Drive)
   111                              <1> 	;           
   112                              <1> 	;   Note: Required dir buffer length may be <= 92 bytes
   113                              <1> 	;         for TRDOS (7*12 name chars + 7 slash + 0)
   114                              <1> 	; OUTPUT ->  ESI = Current Directory Buffer
   115                              <1> 	;            EAX, EBX, ECX, EDX, EDI will be changed
   116                              <1> 	;            CX/CL = Current Directory String Length
   117                              <1> 	;	     DL = Drive Number (0 based)
   118                              <1> 	;            (If input is 0, output is current drv number) 
   119                              <1> 	;            DH = same with input 
   120                              <1> 	;   cf = 0 -> AL = 0
   121                              <1> 	;   cf = 1 -> error code in AL 
   122                              <1>               
   123                              <1> loc_get_current_drive_0:
   124 00009E40 80FA00              <1> 	cmp	dl, 0
   125 00009E43 7708                <1> 	ja	short loc_get_current_drive_1
   126 00009E45 8A15[86590100]      <1> 	mov	dl, [Current_Drv]
   127 00009E4B EB17                <1> 	jmp	short loc_get_current_drive_2
   128                              <1> loc_get_current_drive_1:
   129 00009E4D FECA                <1> 	dec 	dl
   130 00009E4F 3A15[610D0100]      <1> 	cmp	dl, [Last_DOS_DiskNo]
   131 00009E55 760D                <1> 	jna	short loc_get_current_drive_2
   132 00009E57 B80F000000          <1> 	mov	eax, 0Fh ; Invalid drive (Drive not ready!)
   133 00009E5C F5                  <1> 	cmc 	; stc
   134 00009E5D C3                  <1> 	retn
   135                              <1> 
   136                              <1> loc_get_current_drive_not_ready_retn:
   137 00009E5E 5E                  <1> 	pop	esi
   138                              <1> 	;mov	eax, 15
   139 00009E5F 66B80F00            <1> 	mov	ax, 15 ; Drive not ready
   140 00009E63 C3                  <1> 	retn  
   141                              <1>  
   142                              <1> loc_get_current_drive_2:
   143 00009E64 31C0                <1> 	xor	eax, eax
   144 00009E66 88D4                <1> 	mov	ah, dl
   145 00009E68 56                  <1> 	push	esi
   146 00009E69 BE00010900          <1> 	mov	esi, Logical_DOSDisks
   147 00009E6E 01C6                <1> 	add	esi, eax
   148 00009E70 8A06                <1> 	mov	al, [esi+LD_Name] 
   149 00009E72 3C41                <1> 	cmp	al, 'A'
   150 00009E74 72E8                <1> 	jb	short loc_get_current_drive_not_ready_retn
   151                              <1> 
   152 00009E76 8A667F              <1> 	mov	ah, [esi+LD_CDirLevel]
   153 00009E79 08E4                <1> 	or	ah, ah
   154 00009E7B 7506                <1> 	jnz	short loc_get_current_drive_3
   155                              <1> 
   156                              <1> 	;xor	ah, ah ; mov ah, 0
   157 00009E7D 8826                <1> 	mov	[esi], ah
   158 00009E7F 31C9                <1> 	xor	ecx, ecx
   159 00009E81 EB1C                <1> 	jmp	short loc_get_current_drive_4
   160                              <1> 
   161                              <1> loc_get_current_drive_3:
   162 00009E83 BF[E3600100]        <1>         mov     edi, PATH_Array
   163 00009E88 57                  <1> 	push	edi
   164 00009E89 81C680000000        <1> 	add	esi, LD_CurrentDirectory
   165 00009E8F B920000000          <1> 	mov	ecx, 32
   166 00009E94 F3A5                <1> 	rep	movsd
   167 00009E96 5E                  <1> 	pop	esi ; Path Array Address
   168 00009E97 5F                  <1> 	pop	edi ; pushed esi (current dir buffer offset) 
   169                              <1> 	;
   170 00009E98 E841FFFFFF          <1> 	call	set_current_directory_string
   171 00009E9D 89FE                <1> 	mov	esi, edi
   172                              <1> 
   173                              <1> loc_get_current_drive_4:
   174 00009E9F 30C0                <1> 	xor	al, al
   175 00009EA1 C3                  <1> 	retn
   176                              <1> 
   177                              <1> change_current_directory:
   178                              <1> 	; 19/02/2016
   179                              <1> 	; 11/02/2016
   180                              <1> 	; 10/02/2016
   181                              <1> 	; 08/02/2016
   182                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
   183                              <1> 	; 18/09/2011 (DIR.ASM, 09/10/2011)	
   184                              <1> 	; 04/10/2009
   185                              <1> 	; 2005
   186                              <1> 	; INPUT -> 
   187                              <1> 	;	ESI = Directory string
   188                              <1> 	;	ah = CD command (CDh = save current dir string)
   189                              <1> 	; OUTPUT -> 
   190                              <1> 	; 	EDI = DOS Drive Description Table
   191                              <1> 	; 	cf = 1 -> error
   192                              <1> 	;	   EAX = Error code
   193                              <1> 	;	cf = 0 -> successful
   194                              <1> 	;	   ESI = PATH_Array
   195                              <1> 	;	   EAX = Current Directory First Cluster
   196                              <1> 	;
   197                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI will be changed)
   198                              <1> 	
   199 00009EA2 8825[71610100]      <1> 	mov	[CD_COMMAND], ah
   200 00009EA8 803E2F              <1> 	cmp	byte [esi], '/'
   201 00009EAB 7505                <1> 	jne	short loc_ccd_cdir_level
   202 00009EAD 46                  <1> 	inc	esi
   203 00009EAE 30C0                <1> 	xor	al, al
   204 00009EB0 EB05                <1> 	jmp	short loc_ccd_parse_path_name
   205                              <1> loc_ccd_cdir_level:
   206 00009EB2 A0[84590100]        <1> 	mov	al, [Current_Dir_Level]
   207                              <1> loc_ccd_parse_path_name:
   208 00009EB7 88C4                <1> 	mov	ah, al
   209 00009EB9 BF[E3600100]        <1> 	mov	edi, PATH_Array
   210                              <1> 
   211                              <1> ; Reset directory levels > cdir level
   212                              <1> 	; is this required !?
   213                              <1> 	;
   214                              <1> 	; Relations:
   215                              <1> 	; MAINPROG.ASM (pass_ccdrv_reset_cdir_FAT_fcluster)
   216                              <1> 	; proc_parse_dir_name,
   217                              <1> 	; proc_change_current_directory (this procedure)
   218                              <1> 	; proc_change_prompt_dir_string 
   219                              <1>  
   220 00009EBE 0FB6C8              <1> 	movzx	ecx, al
   221 00009EC1 FEC1                <1> 	inc	cl
   222 00009EC3 C0E104              <1> 	shl	cl, 4
   223 00009EC6 01CF                <1> 	add	edi, ecx
   224 00009EC8 B107                <1> 	mov	cl, 7
   225 00009ECA 28C1                <1> 	sub	cl, al
   226 00009ECC C0E102              <1> 	shl	cl, 2
   227 00009ECF 89C3                <1> 	mov	ebx, eax
   228 00009ED1 31C0                <1> 	xor	eax, eax ; 0
   229 00009ED3 F3AB                <1> 	rep	stosd
   230 00009ED5 89D8                <1> 	mov	eax, ebx
   231                              <1> 
   232 00009ED7 BF[E3600100]        <1> 	mov	edi, PATH_Array
   233                              <1> 
   234 00009EDC 803E20              <1> 	cmp	byte [esi], 20h
   235 00009EDF F5                  <1> 	cmc
   236 00009EE0 7305                <1> 	jnc	short pass_ccd_parse_dir_name
   237                              <1> 
   238                              <1> 		; ESI = Path name
   239                              <1> 		; AL = CCD_Level
   240 00009EE2 E872010000          <1>         call    parse_dir_name
   241                              <1> 		; AL = CCD_Level 
   242                              <1> 		; AH = Last_Dir_Level
   243                              <1> 		; (EDI = PATH_Array)
   244                              <1> 
   245                              <1> pass_ccd_parse_dir_name:
   246 00009EE7 9C                  <1> 	pushf
   247                              <1> 
   248                              <1> 	;mov	[CCD_Level], al
   249                              <1>         ;mov	[Last_Dir_Level], ah
   250 00009EE8 66A3[67610100]      <1> 	mov	[CCD_Level], ax
   251                              <1> 
   252 00009EEE 31DB                <1> 	xor	ebx, ebx
   253 00009EF0 8A3D[86590100]      <1> 	mov	bh, [Current_Drv]
   254 00009EF6 BE00010900          <1> 	mov	esi, Logical_DOSDisks
   255 00009EFB 01DE                <1> 	add	esi, ebx
   256                              <1> 
   257 00009EFD 9D                  <1> 	popf 
   258 00009EFE 720A                <1> 	jc	short loc_ccd_bad_path_name_retn
   259                              <1> 
   260 00009F00 8935[63610100]      <1> 	mov	[CCD_DriveDT], esi
   261                              <1> 
   262 00009F06 3C07                <1> 	cmp	al, 7
   263 00009F08 7209                <1> 	jb	short loc_ccd_load_child_dir
   264                              <1> 
   265                              <1> loc_ccd_bad_path_name_retn:
   266 00009F0A 87F7                <1> 	xchg	esi, edi
   267 00009F0C B813000000          <1> 	mov	eax, 19 ; Bad directory/path name 
   268 00009F11 F9                  <1> 	stc
   269                              <1> loc_ccd_retn_p:
   270 00009F12 C3                  <1> 	retn
   271                              <1> 
   272                              <1> loc_ccd_load_child_dir:
   273                              <1> 	; AL = CCD_Level
   274 00009F13 08C0                <1> 	or	al, al
   275 00009F15 7468                <1> 	jz	short loc_ccd_load_root_dir
   276                              <1> 
   277 00009F17 6689C1              <1> 	mov	cx, ax
   278 00009F1A C0E004              <1> 	shl	al, 4
   279 00009F1D 0FB6F0              <1> 	movzx	esi, al
   280 00009F20 01FE                <1>      	add	esi, edi  ; offset PATH_Array
   281                              <1> 
   282 00009F22 8B460C              <1> 	mov	eax, [esi+12]
   283 00009F25 38E9                <1> 	cmp	cl, ch
   284 00009F27 0F84FA000000        <1>         je      loc_ccd_load_sub_directory
   285 00009F2D A3[80590100]        <1> 	mov	[Current_Dir_FCluster], eax
   286                              <1> 
   287                              <1> loc_ccd_load_child_dir_next:
   288 00009F32 83C610              <1> 	add	esi, 16 ; DOS DirEntry Format FileName Address
   289                              <1> 
   290                              <1>  	; Directory attribute : 10h
   291 00009F35 B010                <1> 	mov	al, 00010000b ; 10h (Attrib AND mask)
   292                              <1> 	;mov	ah, 11001000b ; C8h
   293                              <1> 	; Volume name attribute: 8h
   294 00009F37 B408                <1> 	mov	ah, 00001000b ; 08h (Attrib NAND, AND --> zero mask)
   295                              <1> 
   296 00009F39 6631C9              <1> 	xor	cx, cx  
   297 00009F3C E8B5010000          <1> 	call	locate_current_dir_file
   298 00009F41 7353                <1> 	jnc	short loc_ccd_set_dir_cluster_ptr
   299                              <1> 
   300                              <1> 	 ; 19/02/2016
   301                              <1> 	;mov	edi, [CCD_DriveDT]
   302 00009F43 8A25[67610100]      <1> 	mov	ah, [CCD_Level]
   303 00009F49 803D[71610100]CD    <1> 	cmp	byte [CD_COMMAND], 0CDh ;'CD' command or another
   304 00009F50 7509                <1> 	jne	short loc_ccd_load_child_dir_err
   305                              <1> 	; It is better to save recent successful part 
   306                              <1> 	; of the (requested) path as current directory.
   307                              <1> 	; (Otherwise the path would be reset to back
   308                              <1> 	; on the next 'CD' command.)
   309 00009F52 88E1                <1> 	mov	cl, ah
   310 00009F54 50                  <1> 	push	eax
   311 00009F55 E8E3000000          <1> 	call	loc_ccd_save_current_dir
   312 00009F5A 58                  <1> 	pop	eax
   313                              <1> loc_ccd_load_child_dir_err:            
   314 00009F5B 3C03                <1> 	cmp	al, 3	; AL = 2 => File not found error
   315 00009F5D 7202                <1> 	jb	short loc_ccd_path_not_found_retn
   316 00009F5F F9                  <1> 	stc
   317 00009F60 C3                  <1> 	retn
   318                              <1> 
   319                              <1> loc_ccd_path_not_found_retn:
   320 00009F61 B003                <1> 	mov	al, 3	; Path not found
   321 00009F63 C3                  <1> 	retn
   322                              <1> 
   323                              <1> loc_ccd_load_FAT_root_dir:
   324 00009F64 803D[85590100]02    <1> 	cmp	byte [Current_FATType], 2
   325 00009F6B 776B                <1> 	ja	short loc_ccd_load_FAT32_root_dir
   326                              <1> 
   327                              <1> 	;mov	esi, [CCD_DriveDT]
   328                              <1> 	;push	esi
   329 00009F6D E8B51D0000          <1> 	call	load_FAT_root_directory
   330                              <1> 	;pop	edi ; Dos Drv Description Table
   331                              <1> 
   332 00009F72 89F7                <1> 	mov	edi, esi
   333 00009F74 BE[E3600100]        <1> 	mov	esi, PATH_Array
   334 00009F79 7297                <1> 	jc	short loc_ccd_retn_p
   335                              <1> 
   336 00009F7B 31C0                <1> 	xor	eax, eax
   337 00009F7D EB78                <1>         jmp	short loc_ccd_set_cdfc
   338                              <1> 
   339                              <1> loc_ccd_load_root_dir:
   340 00009F7F 803D[85590100]01    <1> 	cmp	byte [Current_FATType], 1
   341 00009F86 73DC                <1> 	jnb	short loc_ccd_load_FAT_root_dir
   342                              <1> 
   343                              <1> loc_ccd_load_FS_root_dir:
   344 00009F88 E8611E0000          <1> 	call	load_FS_root_directory
   345 00009F8D EB5C                <1> 	jmp	short pass_ccd_load_FAT_sub_directory
   346                              <1> 
   347                              <1> loc_ccd_load_FS_sub_directory_next:
   348 00009F8F E85B1E0000          <1> 	call	load_FS_sub_directory
   349 00009F94 EB1F                <1> 	jmp	short pass_ccd_set_dir_cluster_ptr  
   350                              <1> 
   351                              <1> loc_ccd_set_dir_cluster_ptr:
   352                              <1> 	; EDI = Directory Entry
   353 00009F96 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
   354 00009F9A C1E010              <1> 	shl	eax, 16
   355 00009F9D 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
   356                              <1> 
   357 00009FA1 8B35[63610100]      <1> 	mov	esi, [CCD_DriveDT]
   358 00009FA7 803D[85590100]01    <1> 	cmp	byte [Current_FATType], 1
   359 00009FAE 72DF                <1> 	jb	short loc_ccd_load_FS_sub_directory_next
   360                              <1> 	;push	esi
   361 00009FB0 E8FD1D0000          <1> 	call	load_FAT_sub_directory
   362                              <1> 	;pop	edi ; Dos Drv Description Table
   363                              <1> 
   364                              <1> pass_ccd_set_dir_cluster_ptr:
   365                              <1> 	;mov	edi, esi
   366 00009FB5 BE[E3600100]        <1> 	mov	esi, PATH_Array
   367 00009FBA 7264                <1> 	jc	short loc_ccd_retn_c
   368                              <1> 
   369 00009FBC A1[B1600100]        <1> 	mov	eax, [DirBuff_Cluster]
   370                              <1> 
   371 00009FC1 FE05[67610100]      <1> 	inc	byte [CCD_Level]
   372 00009FC7 0FB61D[67610100]    <1> 	movzx	ebx, byte [CCD_Level]
   373 00009FCE C0E304              <1> 	shl	bl, 4 ; * 16 (<= 128)   
   374 00009FD1 01DE                <1> 	add	esi, ebx ; 19/02/2016
   375 00009FD3 89460C              <1> 	mov	[esi+12], eax
   376 00009FD6 EB1F                <1> 	jmp	short loc_ccd_set_cdfc
   377                              <1> 
   378                              <1> loc_ccd_load_FAT32_root_dir:
   379 00009FD8 BE[E3600100]        <1> 	mov	esi, PATH_Array
   380 00009FDD 8B460C              <1> 	mov	eax, [esi+12]
   381 00009FE0 8B35[63610100]      <1> 	mov	esi, [CCD_DriveDT]
   382                              <1>  
   383                              <1> loc_ccd_load_FAT_sub_directory:
   384                              <1> 	;push	esi
   385 00009FE6 E8C71D0000          <1> 	call	load_FAT_sub_directory
   386                              <1> 	;pop	edi ; Dos Drv Description Table
   387                              <1> 
   388                              <1> pass_ccd_load_FAT_sub_directory:
   389                              <1> 	;mov	edi, esi
   390 00009FEB BE[E3600100]        <1> 	mov	esi, PATH_Array
   391 00009FF0 722E                <1> 	jc	short loc_ccd_retn_c
   392                              <1> 
   393 00009FF2 A1[B1600100]        <1> 	mov	eax, [DirBuff_Cluster]
   394                              <1> 
   395                              <1> loc_ccd_set_cdfc:
   396 00009FF7 8A0D[67610100]      <1> 	mov	cl, [CCD_Level]
   397 00009FFD 880D[84590100]      <1> 	mov	[Current_Dir_Level], cl
   398 0000A003 A3[80590100]        <1> 	mov	[Current_Dir_FCluster], eax
   399                              <1> 
   400 0000A008 8A2D[68610100]      <1> 	mov	ch, [Last_Dir_Level]
   401 0000A00E 38E9                <1> 	cmp	cl, ch 
   402 0000A010 0F821CFFFFFF        <1> 	jb	loc_ccd_load_child_dir_next
   403                              <1> 	
   404 0000A016 803D[71610100]CD    <1> 	cmp	byte [CD_COMMAND], 0CDh ;'CD' command or another
   405 0000A01D 741E                <1> 	je	short loc_ccd_save_current_dir
   406                              <1> 
   407                              <1>         ; jne -> don't save, restore (the previous cdir) later !
   408                              <1>         ; (saving the cdir would prevent previous cdir restoration!)
   409                              <1> 
   410 0000A01F F8                  <1> 	clc
   411                              <1> 
   412                              <1> loc_ccd_retn_c:
   413 0000A020 8B3D[63610100]      <1> 	mov	edi, [CCD_DriveDT]
   414 0000A026 C3                  <1> 	retn
   415                              <1> 
   416                              <1> loc_ccd_load_sub_directory:
   417 0000A027 8B35[63610100]      <1> 	mov	esi, [CCD_DriveDT]
   418 0000A02D 803D[85590100]01    <1> 	cmp	byte [Current_FATType], 1
   419 0000A034 73B0                <1> 	jnb	short loc_ccd_load_FAT_sub_directory 
   420 0000A036 E8B41D0000          <1> 	call	load_FS_sub_directory
   421 0000A03B EBAE                <1> 	jmp	short pass_ccd_load_FAT_sub_directory 
   422                              <1> 
   423                              <1> loc_ccd_save_current_dir:
   424 0000A03D BE[E3600100]        <1> 	mov	esi, PATH_Array ; 19/02/2016
   425 0000A042 8B3D[63610100]      <1> 	mov	edi, [CCD_DriveDT]
   426 0000A048 57                  <1> 	push	edi
   427 0000A049 83C77F              <1>         add     edi, LD_CDirLevel
   428 0000A04C 880F                <1> 	mov	[edi], cl
   429 0000A04E 47                  <1> 	inc	edi ; LD_CurrentDirectory 
   430 0000A04F 56                  <1> 	push	esi
   431                              <1> 	;mov	ecx, 32  ; always < 65536 (in this procedure)
   432 0000A050 66B92000            <1> 	mov	cx, 32
   433 0000A054 F3A5                <1> 	rep	movsd
   434                              <1> 	; Current directory has been saved to 
   435                              <1> 	; the DOS drive description table, cdir area !
   436 0000A056 5E                  <1> 	pop	esi  ; PATH_Array
   437 0000A057 5F                  <1> 	pop	edi  ; Dos Drv Description Table
   438                              <1> 
   439 0000A058 C3                  <1> 	retn
   440                              <1> 
   441                              <1> parse_dir_name:
   442                              <1> 	; 11/02/2016
   443                              <1> 	; 10/02/2016
   444                              <1> 	; 07/02/2016 (TRDOS 386 = TRDOS v2.0)
   445                              <1> 	; 18/09/2011
   446                              <1> 	; 17/10/2009
   447                              <1> 	; INPUT ->
   448                              <1> 	;	ESI = ASCIIZ Directory String Address
   449                              <1> 	;	AL = Current Directory Level
   450                              <1> 	;	EDI = Destination Adress
   451                              <1> 	;	     (8 levels, each one 12+4 byte)
   452                              <1> 	; OUTPUT ->
   453                              <1> 	;	EDI = Dir Entry Formatted Array
   454                              <1> 	;	     with zero cluster pointer at the last level
   455                              <1> 	;	AH = Last Dir Level
   456                              <1> 	;	AL = Current Dir Level
   457                              <1> 	;
   458                              <1> 	; (esi, ebx, ecx will be changed) 
   459                              <1> 
   460                              <1> 	;mov	[PATH_Array_Ptr], edi
   461 0000A059 88C4                <1> 	mov	ah, al
   462 0000A05B 66A3[08620100]      <1> 	mov	[PATH_CDLevel], ax
   463                              <1> repeat_ppdn_check_slash:
   464 0000A061 AC                  <1> 	lodsb
   465 0000A062 3C2F                <1> 	cmp	al, '/'
   466 0000A064 74FB                <1> 	je	short repeat_ppdn_check_slash
   467 0000A066 3C21                <1> 	cmp	al, 21h
   468 0000A068 7219                <1> 	jb	short loc_ppdn_retn
   469 0000A06A 57                  <1> 	push	edi
   470                              <1> loc_ppdn_get_dir_name:
   471 0000A06B B90C000000          <1> 	mov	ecx, 12
   472 0000A070 BF[0A620100]        <1> 	mov	edi, Dir_File_Name
   473                              <1> repeat_ppdn_get_dir_name:
   474 0000A075 AA                  <1> 	stosb
   475 0000A076 AC                  <1> 	lodsb
   476 0000A077 3C2F                <1> 	cmp	al, '/'
   477 0000A079 740A                <1> 	je	short loc_check_level_dot_conv_dir_name
   478 0000A07B 3C20                <1> 	cmp	al, 20h
   479 0000A07D 7605                <1> 	jna	short loc_ppdn_end_of_path_scan
   480 0000A07F E2F4                <1> 	loop	repeat_ppdn_get_dir_name
   481 0000A081 5F                  <1> 	pop	edi
   482 0000A082 F9                  <1> 	stc
   483                              <1> loc_ppdn_retn:
   484 0000A083 C3                  <1> 	retn
   485                              <1> 
   486                              <1> loc_ppdn_end_of_path_scan:
   487 0000A084 4E                  <1> 	dec	esi
   488                              <1> loc_check_level_dot_conv_dir_name:
   489 0000A085 31C0                <1> 	xor	eax, eax
   490 0000A087 AA                  <1> 	stosb
   491 0000A088 89F3                <1> 	mov	ebx, esi
   492 0000A08A BE[0A620100]        <1> 	mov	esi, Dir_File_Name
   493 0000A08F AC                  <1> 	lodsb
   494                              <1> repeat_ppdn_name_check_dot:
   495 0000A090 3C2E                <1> 	cmp	al, '.'
   496 0000A092 7509                <1> 	jne	short loc_ppdn_convert_sub_dir_name
   497                              <1> repeat_ppdn_name_dot_dot:
   498 0000A094 AC                  <1> 	lodsb
   499 0000A095 3C2E                <1> 	cmp	al, '.'
   500 0000A097 743E                <1> 	je	short loc_ppdn_dot_dot
   501 0000A099 3C21                <1> 	cmp	al, 21h
   502 0000A09B 7226                <1> 	jb	short pass_ppdn_convert_sub_dir_name
   503                              <1> loc_ppdn_convert_sub_dir_name:
   504 0000A09D 8A25[09620100]      <1> 	mov	ah, [PATH_Level]
   505 0000A0A3 80FC07              <1> 	cmp	ah, 7
   506 0000A0A6 731B                <1> 	jnb	short pass_ppdn_convert_sub_dir_name
   507 0000A0A8 FEC4                <1> 	inc	ah  
   508 0000A0AA 8825[09620100]      <1> 	mov	[PATH_Level], ah
   509 0000A0B0 BE[0A620100]        <1> 	mov	esi, Dir_File_Name
   510                              <1> 	;mov	edi, [PATH_Array_Ptr]
   511 0000A0B5 B010                <1> 	mov	al, 16
   512 0000A0B7 F6E4                <1> 	mul	ah
   513 0000A0B9 8B3C24              <1> 	mov	edi, [esp]
   514                              <1> 	;push	edi 
   515 0000A0BC 01C7                <1> 	add	edi, eax
   516 0000A0BE E82A030000          <1> 	call	convert_file_name
   517                              <1> 	;pop	edi
   518                              <1> pass_ppdn_convert_sub_dir_name:
   519 0000A0C3 89DE                <1> 	mov	esi, ebx
   520                              <1> repeat_ppdn_check_last_slash:
   521 0000A0C5 AC                  <1> 	lodsb
   522 0000A0C6 3C2F                <1> 	cmp	al, '/'
   523 0000A0C8 74FB                <1> 	je	short repeat_ppdn_check_last_slash
   524 0000A0CA 3C21                <1> 	cmp	al, 21h
   525 0000A0CC 739D                <1> 	jnb	short loc_ppdn_get_dir_name
   526                              <1> end_of_parse_dir_name:
   527 0000A0CE 5F                  <1> 	pop	edi
   528 0000A0CF F5                  <1> 	cmc  
   529                              <1> 	;mov	al, [PATH_CDLevel]
   530                              <1> 	;mov	ah, [PATH_Level]
   531 0000A0D0 66A1[08620100]      <1> 	mov	ax, [PATH_CDLevel]
   532 0000A0D6 C3                  <1> 	retn
   533                              <1> 
   534                              <1> loc_ppdn_dot_dot:
   535 0000A0D7 AC                  <1> 	lodsb
   536 0000A0D8 3C21                <1> 	cmp	al, 21h
   537 0000A0DA 73F2                <1> 	jnb	short end_of_parse_dir_name 
   538                              <1> loc_ppdn_dot_dot_prev_level:
   539 0000A0DC 66A1[08620100]      <1> 	mov	ax, [PATH_CDLevel]
   540 0000A0E2 80EC01              <1> 	sub	ah, 1
   541 0000A0E5 80D400              <1> 	adc	ah, 0
   542 0000A0E8 38E0                <1> 	cmp	al, ah
   543 0000A0EA 7602                <1> 	jna	short pass_ppdn_set_al_to_ah
   544 0000A0EC 88E0                <1> 	mov	al, ah
   545                              <1> pass_ppdn_set_al_to_ah:
   546 0000A0EE 66A3[08620100]      <1> 	mov	[PATH_CDLevel], ax
   547 0000A0F4 EBCD                <1> 	jmp	short pass_ppdn_convert_sub_dir_name
   548                              <1> 
   549                              <1> locate_current_dir_file:
   550                              <1> 	; 20/11/2017
   551                              <1> 	; 14/02/2016
   552                              <1> 	; 13/02/2016
   553                              <1> 	; 10/02/2016
   554                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
   555                              <1> 	; 14/08/2010
   556                              <1> 	; 19/09/2009
   557                              <1>         ; 2005
   558                              <1> 	; INPUT ->
   559                              <1> 	;	ESI = DOS DirEntry Format FileName Address
   560                              <1> 	;	AL = Attributes Mask 
   561                              <1> 	;	(<AL AND EntryAttrib> must be equal to AL)
   562                              <1> 	;	AH = Negative Attributes Mask (If AH>0)
   563                              <1> 	;	(<AH AND EntryAttrib> must be ZERO)
   564                              <1> 	;	CH > 0 Find First Free Dir Entry or Deleted Entry
   565                              <1> 	;	CL = 0 -> Return the First Free Dir Entry
   566                              <1> 	;	CL = E5h -> Return the 1st deleted entry
   567                              <1> 	;	CL = FFh -> Return the 1st deleted or free entry
   568                              <1> 	;	CL > 0 and CL <> E5h and CL <> FFh -> Return the first 
   569                              <1> 	;	     proper entry (which fits with Atributes Masks)
   570                              <1> 	;	CX = 0 Find Valid File/Directory/VolumeName
   571                              <1> 	;	? = Any One Char
   572                              <1> 	;	* = Every Chars
   573                              <1> 	; OUTPUT ->
   574                              <1> 	;	EDI = Directory Entry Address (in Directory Buffer)
   575                              <1> 	;	ESI = DOS DirEntry Format FileName Address
   576                              <1> 	;	CF = 0 -> No Error, Proper Entry,
   577                              <1> 	;	DL = Attributes
   578                              <1> 	;	DH = Previous Entry Attr (LongName Check)
   579                              <1> 	;	AL > 0 -> Ambiguous filename wildcard "?" used
   580                              <1> 	;	AH > 0 -> Ambiguous filename wildcard "*" used
   581                              <1> 	;	AX = 0 -> Filename full fits with directory entry
   582                              <1> 	;	CH = The 1st Name Char of Current Dir Entry
   583                              <1> 	;	CF = 1 -> Proper entry not found, Error Code in EAX/AL
   584                              <1> 	;	CL = 0 and CH = 0 -> Free Entry (End Of Dir)
   585                              <1> 	;	CL = 0 and CH = E5h -> Deleted Entry fits with filters
   586                              <1> 	;	CL > 0 -> Entry not found, CH invalid
   587                              <1> 	;	CF = 0 -> 
   588                              <1> 	;	EBX = Current Directory Entry Index/Number (BX)
   589                              <1> 
   590                              <1> 	;mov	word [DirBuff_EntryCounter], 0 ; Zero Based
   591                              <1> 
   592 0000A0F6 8935[6B610100]      <1> 	mov	[CDLF_FNAddress], esi
   593 0000A0FC 66A3[69610100]      <1> 	mov	[CDLF_AttributesMask], ax
   594 0000A102 66890D[6F610100]    <1> 	mov	[CDLF_DEType], cx
   595                              <1> 
   596 0000A109 31DB                <1> 	xor	ebx, ebx
   597 0000A10B 881D[80610100]      <1> 	mov	[PreviousAttr], bl ; 0  ; 13/02/2016
   598                              <1> 
   599 0000A111 8A3D[86590100]      <1> 	mov	bh, [Current_Drv]
   600 0000A117 381D[AC600100]      <1> 	cmp	byte [DirBuff_ValidData], bl ; 0
   601 0000A11D 761D                <1> 	jna	short loc_lcdf_reload_current_dir2
   602 0000A11F 8A1D[AA600100]      <1>         mov     bl, [DirBuff_DRV]
   603 0000A125 80EB41              <1> 	sub	bl, 'A'
   604 0000A128 38DF                <1> 	cmp	bh, bl
   605 0000A12A 750E                <1> 	jne	short loc_lcdf_reload_current_dir1
   606 0000A12C 8B15[B1600100]      <1> 	mov	edx, [DirBuff_Cluster]
   607 0000A132 3B15[80590100]      <1> 	cmp	edx, [Current_Dir_FCluster]
   608 0000A138 7412                <1> 	je	short loc_cdir_locatefile_search
   609                              <1> 
   610                              <1> loc_lcdf_reload_current_dir1:
   611 0000A13A 30DB                <1> 	xor	bl, bl
   612                              <1> loc_lcdf_reload_current_dir2:
   613 0000A13C 89DE                <1> 	mov	esi, ebx
   614 0000A13E 81C600010900        <1>         add     esi, Logical_DOSDisks
   615 0000A144 E874000000          <1> 	call	reload_current_directory 
   616 0000A149 735D                <1> 	jnc	short loc_locatefile_search_again 
   617 0000A14B C3                  <1> 	retn  
   618                              <1> 
   619                              <1> loc_cdir_locatefile_search:
   620 0000A14C 31DB                <1> 	xor	ebx, ebx
   621 0000A14E 55                  <1> 	push	ebp ; 20/11/2017
   622 0000A14F E8A6000000          <1> 	call	find_directory_entry
   623 0000A154 5D                  <1> 	pop	ebp ; 20/11/2017
   624 0000A155 7349                <1> 	jnc	short loc_cdir_locate_file_retn
   625                              <1> 
   626                              <1> loc_locatefile_check_stc_reason:
   627 0000A157 08ED                <1> 	or	ch, ch
   628 0000A159 7444                <1> 	jz	short loc_cdir_locate_file_stc_retn
   629                              <1> 
   630                              <1> loc_locatefile_check_next_entryblock:
   631 0000A15B 8A3D[86590100]      <1> 	mov	bh, [Current_Drv]
   632 0000A161 28DB                <1> 	sub	bl, bl
   633 0000A163 0FB7F3              <1> 	movzx	esi, bx
   634 0000A166 81C600010900        <1>         add     esi, Logical_DOSDisks
   635                              <1> 
   636 0000A16C 803D[84590100]00    <1> 	cmp	byte [Current_Dir_Level], 0
   637 0000A173 760A                <1> 	jna	short loc_locatefile_check_FAT_type
   638                              <1>             
   639 0000A175 803D[85590100]01    <1> 	cmp	byte [Current_FATType], 1
   640 0000A17C 730A                <1> 	jnb	short loc_locatefile_load_subdir_cluster
   641 0000A17E C3                  <1> 	retn  
   642                              <1> 
   643                              <1> loc_locatefile_check_FAT_type:
   644 0000A17F 803D[85590100]03    <1> 	cmp	byte [Current_FATType], 3
   645 0000A186 7218                <1> 	jb	short loc_cdir_locate_file_retn
   646                              <1> 
   647                              <1> loc_locatefile_load_subdir_cluster:
   648 0000A188 A1[B1600100]        <1> 	mov	eax, [DirBuff_Cluster]
   649 0000A18D E83A1A0000          <1> 	call	get_next_cluster
   650 0000A192 730D                <1> 	jnc	short loc_locatefile_next_cluster
   651 0000A194 09C0                <1> 	or	eax, eax
   652 0000A196 7507                <1> 	jnz	short loc_locatefile_drive_not_ready_read_err
   653 0000A198 F9                  <1> 	stc
   654                              <1> loc_locatefile_file_notfound:
   655 0000A199 B802000000          <1> 	mov	eax, 2 ; File/Directory/VolName not found
   656 0000A19E C3                  <1> 	retn
   657                              <1> 
   658                              <1> loc_locatefile_drive_not_ready_read_err:
   659                              <1> 	;mov	eax, 17 ;Drive not ready or read error
   660                              <1> loc_cdir_locate_file_stc_retn:
   661 0000A19F F5                  <1> 	cmc ;stc
   662                              <1> loc_cdir_locate_file_retn:
   663 0000A1A0 C3                  <1> 	retn
   664                              <1> 
   665                              <1> loc_locatefile_next_cluster:
   666 0000A1A1 E80C1C0000          <1> 	call	load_FAT_sub_directory
   667                              <1> 	;jc	short loc_locatefile_drive_not_ready_read_err
   668 0000A1A6 72F8                <1> 	jc	short loc_cdir_locate_file_retn 
   669                              <1> 
   670                              <1> loc_locatefile_search_again:
   671 0000A1A8 8B35[6B610100]      <1> 	mov	esi, [CDLF_FNAddress] 
   672 0000A1AE 66A1[69610100]      <1> 	mov	ax, [CDLF_AttributesMask]
   673 0000A1B4 668B0D[6F610100]    <1> 	mov	cx, [CDLF_DEType] 
   674 0000A1BB EB8F                <1> 	jmp	short loc_cdir_locatefile_search
   675                              <1> 
   676                              <1> reload_current_directory:
   677                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
   678                              <1> 	; 13/06/2010
   679                              <1> 	; 22/09/2009
   680                              <1>         ;
   681                              <1> 	; INPUT ->
   682                              <1> 	;	ESI = Dos drive description table address
   683                              <1> 	
   684                              <1> 	;mov	al, [esi+LD_FATType]
   685 0000A1BD A0[85590100]        <1> 	mov	al, [Current_FATType]
   686 0000A1C2 3C02                <1> 	cmp	al, 2
   687 0000A1C4 7729                <1> 	ja	short loc_reload_FAT_sub_directory
   688 0000A1C6 8A25[84590100]      <1> 	mov	ah, [Current_Dir_Level]
   689 0000A1CC 08C0                <1> 	or	al, al
   690 0000A1CE 740A                <1> 	jz	short loc_reload_FS_directory
   691 0000A1D0 08E4                <1> 	or	ah, ah
   692 0000A1D2 751B                <1> 	jnz	short loc_reload_FAT_sub_directory
   693                              <1> loc_reload_FAT_12_16_root_directory:
   694 0000A1D4 E84E1B0000          <1> 	call	load_FAT_root_directory
   695 0000A1D9 C3                  <1> 	retn
   696                              <1> loc_reload_FS_directory:
   697 0000A1DA 20E4                <1> 	and	ah, ah
   698 0000A1DC 7506                <1> 	jnz	short loc_reload_FS_sub_directory 
   699                              <1> loc_reload_FS_root_directory: 
   700 0000A1DE E80B1C0000          <1> 	call	load_FS_root_directory
   701 0000A1E3 C3                  <1> 	retn
   702                              <1> loc_reload_FS_sub_directory:
   703 0000A1E4 A1[80590100]        <1> 	mov	eax, [Current_Dir_FCluster]
   704 0000A1E9 E8011C0000          <1> 	call	load_FS_sub_directory
   705 0000A1EE C3                  <1> 	retn 
   706                              <1> loc_reload_FAT_sub_directory:
   707 0000A1EF A1[80590100]        <1> 	mov	eax, [Current_Dir_FCluster]
   708 0000A1F4 E8B91B0000          <1> 	call	load_FAT_sub_directory
   709 0000A1F9 C3                  <1> 	retn
   710                              <1> 
   711                              <1> find_directory_entry:
   712                              <1> 	; 14/02/2016
   713                              <1> 	; 13/02/2016
   714                              <1> 	; 10/02/2016
   715                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
   716                              <1> 	; 14/08/2010 (DIR.ASM, "proc_find_direntry")
   717                              <1> 	; 19/09/2009
   718                              <1> 	; 2005
   719                              <1> 	; INPUT ->
   720                              <1> 	;	ESI = Sub Dir or File Name Address
   721                              <1> 	;	AL = Attributes Mask 
   722                              <1> 	;	(<AL AND EntryAttrib> must be equal to AL)
   723                              <1> 	;	AH = Negative Attributes Mask (If AH>0)
   724                              <1> 	;	(<AH AND EntryAttrib> must be ZERO)
   725                              <1> 	;	CH > 0 Find First Free Dir Entry or Deleted Entry
   726                              <1> 	;	CL = 0 -> Return the First Free Dir Entry
   727                              <1> 	;	CL = E5h -> Return the 1st deleted entry
   728                              <1> 	;	CL = FFh -> Return the 1st deleted or free entry
   729                              <1> 	;	CL > 0 and CL <> E5h and CL <> FFh -> Return the first 
   730                              <1> 	;            proper entry (which fits with Atributes Masks)
   731                              <1> 	;	CX = 0 -> Find Valid File/Directory/VolumeName
   732                              <1> 	;	? = Any One Char
   733                              <1> 	;	* = Every Chars
   734                              <1> 	;	EBX = Current Dir Entry (BX)
   735                              <1> 	;
   736                              <1> 	; OUTPUT -> 
   737                              <1> 	;	EDI = Directory Entry Address (in DirectoryBuffer)
   738                              <1> 	;	ESI = Sub Dir or File Name Address
   739                              <1> 	;	CF = 0 -> No Error, Proper Entry,
   740                              <1> 	;	DL = Attributes
   741                              <1> 	;	DH = Previous Entry Attr (LongName Check)
   742                              <1> 	;	AL > 0 -> Ambiguous filename wildcard "?" used
   743                              <1> 	;	AH > 0 -> Ambiguous filename wildcard "*" used
   744                              <1> 	;	AX = 0 -> Filename full fits with directory entry
   745                              <1> 	;	EBX = CurrentDirEntry (BX)
   746                              <1> 	;	CH = The 1st Name Char of Current Dir Entry
   747                              <1> 	;	CF = 1 -> Proper entry not found, Error Code in AX/AL
   748                              <1> 	;	CL = 0 and CH = 0 -> Free Entry (End Of Dir)
   749                              <1> 	;	CL = 0 and CH = E5h -> Deleted Entry fits with filters
   750                              <1> 	;	CL > 0 -> Entry not found, CH invalid
   751                              <1> 	;
   752                              <1> 	; (EAX, EBX, ECX, EDX, EDI, EBP will be changed)	 
   753                              <1> 
   754 0000A1FA 663B1D[AF600100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   755 0000A201 0F8739010000        <1>         ja      loc_ffde_stc_retn_255
   756                              <1> 
   757                              <1> 	;mov    [DirBuff_CurrentEntry], bx  
   758                              <1> 
   759 0000A207 BF00000800          <1>   	mov	edi, Directory_Buffer
   760 0000A20C 66A3[7C610100]      <1> 	mov	[FDE_AttrMask], ax
   761                              <1> 
   762 0000A212 29C0                <1> 	sub	eax, eax
   763                              <1>             
   764                              <1> 	;;mov	[PreviousAttr], al ; 0 ;; 13/02/2016
   765 0000A214 66A3[7E610100]      <1> 	mov	[AmbiguousFileName], ax ; 0
   766                              <1> 
   767 0000A21A 6689D8              <1> 	mov	ax, bx
   768 0000A21D 66C1E005            <1> 	shl	ax, 5 ; ; * 32 ; Directory entry size
   769 0000A221 01C7                <1> 	add     edi, eax
   770                              <1> 
   771 0000A223 08ED                <1> 	or	ch, ch
   772 0000A225 0F852C010000        <1>         jnz     loc_find_free_deleted_entry_0
   773                              <1> 
   774 0000A22B 08C9                <1> 	or      cl, cl
   775 0000A22D 0F850D010000        <1>         jnz     loc_ffde_stc_retn_255
   776                              <1>  
   777                              <1> check_find_dir_entry:
   778 0000A233 66A1[7C610100]      <1> 	mov	ax, [FDE_AttrMask]
   779 0000A239 8A2F                <1> 	mov	ch, [edi]
   780 0000A23B 80FD00              <1> 	cmp     ch, 0 ; Is it never used entry?
   781 0000A23E 0F86FF000000        <1> 	jna	loc_find_direntry_stc_retn 
   782 0000A244 56                  <1> 	push	esi
   783 0000A245 8A570B              <1> 	mov	dl, [edi+0Bh] ; File attributes
   784 0000A248 80FDE5              <1> 	cmp	ch, 0E5h ; Is it a deleted file?
   785 0000A24B 746D                <1> 	je	short loc_find_dir_next_entry_prevdeleted
   786                              <1> 
   787 0000A24D 80FA0F              <1> 	cmp     dl, 0Fh ; longname sub component check
   788 0000A250 7505                <1> 	jne     short loc_check_attributes_mask
   789 0000A252 E8ED010000          <1> 	call	save_longname_sub_component
   790                              <1> 
   791                              <1> loc_check_attributes_mask:
   792 0000A257 88C6                <1> 	mov	dh, al
   793 0000A259 20D6                <1> 	and	dh, dl    
   794 0000A25B 38F0                <1> 	cmp	al, dh
   795 0000A25D 0F85BA000000        <1>         jne     loc_find_dir_next_entry
   796 0000A263 20D4                <1> 	and	ah, dl
   797 0000A265 0F85B2000000        <1>         jnz     loc_find_dir_next_entry
   798 0000A26B 80FA0F              <1> 	cmp	dl, 0Fh
   799 0000A26E 751A                <1> 	jne	short pass_direntry_attr_check
   800                              <1> 
   801 0000A270 3C0F                <1> 	cmp	al, 0Fh ; AL = 0Fh -> find long name
   802 0000A272 0F85A5000000        <1>         jne     loc_find_dir_next_entry
   803                              <1> 
   804 0000A278 5E                  <1> 	pop	esi
   805 0000A279 6631C0              <1> 	xor	ax, ax
   806 0000A27C 8A35[80610100]      <1> 	mov	dh, [PreviousAttr]
   807 0000A282 66891D[AD600100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   808 0000A289 C3                  <1> 	retn
   809                              <1> 
   810                              <1> pass_direntry_attr_check:
   811 0000A28A 89FD                <1> 	mov	ebp, edi ; 14/02/2016
   812 0000A28C B908000000          <1> 	mov	ecx, 8
   813                              <1> loc_lodsb_find_dir:
   814 0000A291 AC                  <1> 	lodsb
   815 0000A292 3C2A                <1> 	cmp	al, '*'
   816 0000A294 7508                <1> 	jne	short pass_fde_ambiguous1_check
   817 0000A296 FE05[7F610100]      <1>         inc     byte [AmbiguousFileName+1]
   818 0000A29C EB28                <1> 	jmp	short loc_check_direntry_extension
   819                              <1> 
   820                              <1> pass_fde_ambiguous1_check:
   821 0000A29E 3C3F                <1> 	cmp	al, '?'
   822 0000A2A0 750D                <1> 	jne	short pass_fde_ambiguous2_check
   823 0000A2A2 FE05[7E610100]      <1> 	inc	byte [AmbiguousFileName]
   824 0000A2A8 803F20              <1> 	cmp	byte [edi], 20h
   825 0000A2AB 764E                <1> 	jna	short loc_find_dir_next_entry_ebp
   826 0000A2AD EB14                <1> 	jmp	short loc_scasb_find_dir_inc_di
   827                              <1> 
   828                              <1> pass_fde_ambiguous2_check:
   829 0000A2AF 3C20                <1> 	cmp	al, 20h
   830 0000A2B1 750C                <1> 	jne	short loc_scasb_find_dir
   831 0000A2B3 803F20              <1> 	cmp	byte [edi], 20h
   832 0000A2B6 7543                <1> 	jne	short loc_find_dir_next_entry_ebp
   833 0000A2B8 EB0C                <1> 	jmp	short loc_check_direntry_extension
   834                              <1> 
   835                              <1> loc_find_dir_next_entry_prevdeleted:
   836 0000A2BA 80CA80              <1> 	or	dl, 80h  ; Bit 7 -> deleted entry sign
   837 0000A2BD EB5E                <1> 	jmp	short loc_find_dir_next_entry
   838                              <1> 
   839                              <1> loc_scasb_find_dir:
   840 0000A2BF 3A07                <1> 	cmp	al, [edi]
   841 0000A2C1 7538                <1> 	jne	short loc_find_dir_next_entry_ebp
   842                              <1> loc_scasb_find_dir_inc_di:
   843 0000A2C3 47                  <1> 	inc	edi
   844 0000A2C4 E2CB                <1> 	loop	loc_lodsb_find_dir
   845                              <1> 
   846                              <1> loc_check_direntry_extension:
   847 0000A2C6 BE08000000          <1> 	mov	esi, 8
   848 0000A2CB 89F7                <1> 	mov	edi, esi ; 8
   849 0000A2CD 033424              <1> 	add	esi, [esp] ; Sub Dir or File Name Address
   850 0000A2D0 01EF                <1> 	add	edi, ebp
   851 0000A2D2 B103                <1> 	mov	cl, 3
   852                              <1> loc_lodsb_find_dir_ext:
   853 0000A2D4 AC                  <1> 	lodsb
   854 0000A2D5 3C2A                <1> 	cmp	al, '*'
   855 0000A2D7 7508                <1> 	jne	short pass_fde_ambiguous3_check
   856 0000A2D9 FE05[7F610100]      <1> 	inc	byte [AmbiguousFileName+1]
   857 0000A2DF EB1E                <1> 	jmp	short loc_find_dir_proper_direntry
   858                              <1> 
   859                              <1> pass_fde_ambiguous3_check:
   860 0000A2E1 3C3F                <1> 	cmp	al, '?'
   861 0000A2E3 750D                <1> 	jne	short pass_fde_ambiguous4_check
   862 0000A2E5 FE05[7E610100]      <1> 	inc	byte [AmbiguousFileName]
   863 0000A2EB 803F20              <1> 	cmp	byte [edi], 20h
   864 0000A2EE 760B                <1> 	jna	short loc_find_dir_next_entry_ebp
   865 0000A2F0 EB49                <1> 	jmp	short loc_scasb_find_dir_ext_inc_di
   866                              <1> 
   867                              <1> pass_fde_ambiguous4_check:
   868 0000A2F2 3C20                <1> 	cmp	al, 20h
   869 0000A2F4 7541                <1> 	jne	short loc_scasb_find_dir_ext
   870 0000A2F6 803F20              <1> 	cmp	byte [edi], 20h
   871 0000A2F9 7404                <1> 	je	short loc_find_dir_proper_direntry
   872                              <1> 
   873                              <1> loc_find_dir_next_entry_ebp:
   874 0000A2FB 89EF                <1> 	mov	edi, ebp ; 14/02/2016
   875 0000A2FD EB1E                <1> 	jmp	short loc_find_dir_next_entry
   876                              <1> 
   877                              <1> loc_find_dir_proper_direntry:
   878 0000A2FF 30C9                <1> 	xor	cl, cl
   879                              <1> loc_find_dir_proper_direntry_1:
   880 0000A301 5E                  <1> 	pop	esi
   881 0000A302 89EF                <1>         mov     edi, ebp
   882 0000A304 8A2F                <1> 	mov	ch, [edi]
   883 0000A306 8A570B              <1> 	mov     dl, [edi+0Bh] ; Dir entry attributes
   884 0000A309 66A1[7E610100]      <1> 	mov	ax, [AmbiguousFileName]
   885                              <1> loc_find_dir_proper_direntry_2:
   886 0000A30F 8A35[80610100]      <1> 	mov     dh, [PreviousAttr]
   887 0000A315 66891D[AD600100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   888 0000A31C C3                  <1> 	retn
   889                              <1> 
   890                              <1> loc_find_dir_next_entry:
   891 0000A31D 8815[80610100]      <1> 	mov	byte [PreviousAttr], dl ; LongName check
   892                              <1> loc_find_dir_next_entry_1:
   893 0000A323 5E                  <1> 	pop	esi
   894 0000A324 83C720              <1> 	add	edi, 32
   895                              <1> 	;inc	word [DirBuff_EntryCounter]
   896 0000A327 6643                <1> 	inc	bx
   897 0000A329 663B1D[AF600100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   898 0000A330 770E                <1> 	ja	short loc_ffde_stc_retn_255
   899 0000A332 E9FCFEFFFF          <1>         jmp     check_find_dir_entry 
   900                              <1> 
   901                              <1> loc_scasb_find_dir_ext:
   902 0000A337 3A07                <1> 	cmp	al, [edi]
   903 0000A339 75C0                <1> 	jne	short loc_find_dir_next_entry_ebp
   904                              <1> loc_scasb_find_dir_ext_inc_di:
   905 0000A33B 47                  <1> 	inc	edi
   906 0000A33C E296                <1> 	loop    loc_lodsb_find_dir_ext
   907 0000A33E EBC1                <1> 	jmp	short loc_find_dir_proper_direntry_1
   908                              <1> 
   909                              <1> loc_ffde_stc_retn_255:
   910                              <1> 	;mov	cx, 0FFFFh
   911 0000A340 31C9                <1> 	xor	ecx, ecx
   912 0000A342 49                  <1> 	dec	ecx ; 0FFFFFFFFh
   913                              <1> 	;xor	eax, eax
   914                              <1> loc_find_direntry_stc_retn:
   915                              <1> loc_check_ffde_retn_1:
   916                              <1> 	;mov	ax, 2
   917 0000A343 B802000000          <1> 	mov	eax, 2 ; File Not Found
   918 0000A348 8A35[80610100]      <1> 	mov	dh, [PreviousAttr]
   919 0000A34E 66891D[AD600100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   920 0000A355 F9                  <1> 	stc
   921 0000A356 C3                  <1> 	retn
   922                              <1> 
   923                              <1> loc_find_free_deleted_entry_0:
   924 0000A357 66A1[7C610100]      <1> 	mov	ax, [FDE_AttrMask]
   925 0000A35D 8A2F                <1> 	mov	ch, [edi]
   926 0000A35F 8A570B              <1> 	mov	dl, [edi+0Bh] ; File attributes
   927 0000A362 08C9                <1> 	or	cl, cl 
   928 0000A364 7407                <1> 	jz	short loc_check_ffde_0_repeat
   929                              <1> 	;cmp	cl, 0E5h
   930                              <1> 	;je	short pass_loc_check_ffde_0_err
   931 0000A366 80F9FF              <1> 	cmp	cl, 0FFh
   932 0000A369 7432                <1> 	je	short loc_find_free_deleted_entry_1
   933 0000A36B EB4D                <1> 	jmp	short pass_loc_check_ffde_0_err
   934                              <1> 
   935                              <1> loc_check_ffde_0_repeat:
   936 0000A36D 08ED                <1> 	or	ch, ch
   937 0000A36F 7511                <1> 	jnz	short loc_check_ffde_0_next
   938                              <1> 
   939                              <1> loc_check_ffde_retn_2:
   940 0000A371 6629C0              <1> 	sub	ax, ax
   941 0000A374 8A35[80610100]      <1> 	mov	dh, [PreviousAttr]
   942 0000A37A 66891D[AD600100]    <1> 	mov	[DirBuff_CurrentEntry], bx
   943 0000A381 C3                  <1> 	retn
   944                              <1>  
   945                              <1> loc_check_ffde_0_next:
   946 0000A382 6643                <1> 	inc	bx
   947 0000A384 83C720              <1> 	add	edi, 32
   948                              <1> 	;inc	word [DirBuff_EntryCounter]
   949                              <1> 	 
   950 0000A387 663B1D[AF600100]    <1>         cmp	bx, [DirBuff_LastEntry]
   951 0000A38E 77B0                <1> 	ja	short loc_ffde_stc_retn_255
   952 0000A390 8815[80610100]      <1> 	mov	[PreviousAttr], dl
   953 0000A396 8A2F                <1> 	mov	ch, [edi]
   954 0000A398 8A570B              <1> 	mov	dl, [edi+0Bh] ; file attributes
   955 0000A39B EBD0                <1> 	jmp	short loc_check_ffde_0_repeat
   956                              <1> 
   957                              <1> loc_find_free_deleted_entry_1:
   958 0000A39D 28D2                <1> 	sub	dl, dl      
   959                              <1> loc_find_free_deleted_entry_2:
   960 0000A39F 20ED                <1> 	and	ch, ch  
   961 0000A3A1 74CE                <1> 	jz	short loc_check_ffde_retn_2
   962 0000A3A3 80FDE5              <1> 	cmp	ch, 0E5h
   963 0000A3A6 74C9                <1> 	je	short loc_check_ffde_retn_2
   964 0000A3A8 6643                <1> 	inc	bx
   965 0000A3AA 83C720              <1> 	add	edi, 32
   966 0000A3AD 663B1D[AF600100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   967 0000A3B4 778A                <1> 	ja	short loc_ffde_stc_retn_255
   968 0000A3B6 8A2F                <1> 	mov	ch, [edi]
   969 0000A3B8 EBE5                <1> 	jmp	short loc_find_free_deleted_entry_2
   970                              <1> 
   971                              <1> pass_loc_check_ffde_0_err:
   972 0000A3BA 38CD                <1> 	cmp	ch, cl
   973 0000A3BC 741F                <1> 	je	short loc_check_ffde_attrib 
   974                              <1> 
   975 0000A3BE 6643                <1> 	inc	bx
   976 0000A3C0 83C720              <1> 	add	edi, 32
   977 0000A3C3 663B1D[AF600100]    <1> 	cmp	bx, [DirBuff_LastEntry]
   978 0000A3CA 0F8770FFFFFF        <1>         ja      loc_ffde_stc_retn_255
   979 0000A3D0 8815[80610100]      <1> 	mov	[PreviousAttr], dl
   980 0000A3D6 8A2F                <1> 	mov	ch, [edi]
   981 0000A3D8 8A570B              <1> 	mov	dl, [edi+0Bh]
   982 0000A3DB EBDD                <1> 	jmp	short pass_loc_check_ffde_0_err
   983                              <1> 
   984                              <1> loc_check_ffde_attrib:
   985 0000A3DD 88C6                <1> 	mov	dh, al
   986 0000A3DF 20D6                <1> 	and	dh, dl    
   987 0000A3E1 38F0                <1> 	cmp	al, dh
   988 0000A3E3 759D                <1> 	jne	short loc_check_ffde_0_next
   989 0000A3E5 20D4                <1> 	and	ah, dl
   990 0000A3E7 7599                <1> 	jnz	short loc_check_ffde_0_next
   991 0000A3E9 30C9                <1> 	xor	cl, cl 
   992 0000A3EB EB84                <1>         jmp     loc_check_ffde_retn_2
   993                              <1> 
   994                              <1> convert_file_name:
   995                              <1> 	; 06/03/2016
   996                              <1> 	; 11/02/2016
   997                              <1> 	; 07/02/2016 (TRDOS 386 = TRDOS v2.0)
   998                              <1> 	; 06/10/2009
   999                              <1> 	; 2005
  1000                              <1> 	;
  1001                              <1> 	; INPUT  ->
  1002                              <1> 	;	ESI = Dot File Name Location
  1003                              <1> 	;	EDI = Dir Entry Format File Name Location
  1004                              <1> 	; OUTPUT ->
  1005                              <1> 	;	EDI = Dir Entry Format File Name Location
  1006                              <1> 	;	ESI = Dot File Name Location (capitalized)
  1007                              <1> 	;
  1008                              <1> 	; (ECX, AL will be changed) 
  1009                              <1>      
  1010 0000A3ED 56                  <1> 	push	esi  
  1011 0000A3EE 57                  <1> 	push	edi
  1012                              <1> 
  1013 0000A3EF B90B000000          <1> 	mov	ecx, 11
  1014 0000A3F4 B020                <1> 	mov	al, 20h
  1015 0000A3F6 F3AA                <1> 	rep	stosb
  1016                              <1> 
  1017 0000A3F8 8B3C24              <1> 	mov	edi, [esp]
  1018                              <1> 
  1019 0000A3FB B10C                <1> 	mov	cl, 12 ; file name length (max.)
  1020                              <1> 	; 06/03/2016
  1021                              <1> 	; Directory entry name limit (11 bytes) check for
  1022                              <1> 	; 'rename_directory_entry' procedure.
  1023                              <1> 	; (EDI points to Directory Entry)
  1024                              <1> 	; (If the file name would not contain a dot
  1025                              <1> 	; and file name length would be 12, this would cause to
  1026                              <1> 	; overwrite the attributes byte of the directory entry.)
  1027                              <1> 	;
  1028 0000A3FD B50B                <1> 	mov	ch, 11 ; directory entry's name length
  1029                              <1> loc_check_first_dot:
  1030 0000A3FF 8A06                <1> 	mov	al, [esi]
  1031 0000A401 3C2E                <1> 	cmp	al, 2Eh
  1032 0000A403 750C                <1> 	jne	short pass_check_first_dot
  1033 0000A405 8807                <1> 	mov	[edi], al
  1034 0000A407 47                  <1> 	inc	edi
  1035 0000A408 46                  <1> 	inc	esi
  1036 0000A409 FEC9                <1> 	dec	cl
  1037 0000A40B 75F2                <1> 	jnz	short loc_check_first_dot
  1038                              <1> 	;;(ecx <= 12)
  1039                              <1> 	;;loop	loc_check_first_dot 
  1040 0000A40D EB30                <1> 	jmp	short stop_convert_file
  1041                              <1> 
  1042                              <1> loc_get_fchar:
  1043 0000A40F 8A06                <1> 	mov	al, [esi]
  1044                              <1> pass_check_first_dot:
  1045 0000A411 3C61                <1> 	cmp	al, 61h ; 'a'
  1046 0000A413 7208                <1> 	jb	short pass_name_capitalize
  1047 0000A415 3C7A                <1> 	cmp	al, 7Ah ; 'z'
  1048 0000A417 7704                <1> 	ja	short pass_name_capitalize
  1049 0000A419 24DF                <1> 	and	al, 0DFh
  1050 0000A41B 8806                <1> 	mov	[esi], al
  1051                              <1> pass_name_capitalize:
  1052 0000A41D 3C21                <1> 	cmp	al, 21h
  1053 0000A41F 721E                <1> 	jb	short stop_convert_file
  1054 0000A421 3C2E                <1> 	cmp	al, 2Eh ; '.'
  1055 0000A423 750C                <1> 	jne	short pass_dot_space
  1056                              <1> add_dot_space: 
  1057 0000A425 80F904              <1> 	cmp	cl, 4
  1058 0000A428 760E                <1> 	jna	short inc_and_loop
  1059 0000A42A 47                  <1> 	inc	edi
  1060 0000A42B FECD                <1> 	dec	ch ; 06/03/2016
  1061 0000A42D FEC9                <1> 	dec	cl
  1062 0000A42F EBF4                <1> 	jmp	short add_dot_space
  1063                              <1> 	
  1064                              <1> 	;mov	al, 4
  1065                              <1> 	;cmp	cl, al
  1066                              <1> 	;jna	short inc_and_loop
  1067                              <1> 	;sub	cl, al
  1068                              <1> 	;add	edi, ecx
  1069                              <1> 	;mov	cl, al
  1070                              <1> 	;jmp	short inc_and_loop	
  1071                              <1> 
  1072                              <1> pass_dot_space:
  1073 0000A431 8807                <1> 	mov	[edi], al
  1074                              <1> loc_after_double_dot:
  1075                              <1> 	; 06/03/2016
  1076 0000A433 FECD                <1> 	dec	ch ; count down for 11 bytes dir entry limit
  1077 0000A435 740A                <1> 	jz	short stop_convert_file_x
  1078 0000A437 47                  <1> 	inc	edi
  1079                              <1> inc_and_loop:
  1080 0000A438 FEC9                <1> 	dec	cl ; count down for 12 bytes filename limit 
  1081 0000A43A 7403                <1> 	jz	short stop_convert_file	
  1082 0000A43C 46                  <1> 	inc	esi
  1083                              <1> 	;;(ecx <= 12)
  1084                              <1> 	;;loop	loc_get_fchar
  1085 0000A43D EBD0                <1> 	jmp	short loc_get_fchar
  1086                              <1> 
  1087                              <1> stop_convert_file:
  1088                              <1> 	; 06/03/2016
  1089 0000A43F 30ED                <1> 	xor	ch, ch
  1090                              <1> 	; ECX < 256 ; 'find_first_file' -> xor cl, cl
  1091                              <1> stop_convert_file_x:
  1092 0000A441 5F                  <1> 	pop	edi
  1093 0000A442 5E                  <1> 	pop	esi
  1094 0000A443 C3                  <1> 	retn
  1095                              <1>  
  1096                              <1> save_longname_sub_component:
  1097                              <1> 	; 13/02/2016
  1098                              <1> 	; 06/02/2016 (TRDOS 386 = TRDOS v2.0)
  1099                              <1> 	; 28/02/2010
  1100                              <1> 	; 17/10/2009
  1101                              <1> 	; INPUT ->
  1102                              <1> 	;	EDI = Directory Entry    
  1103                              <1> 	;     	// This procedure is called
  1104                              <1> 	;	// from 'find_directory_entry' procedure.
  1105                              <1> 	;	// If the last entry returns with
  1106                              <1> 	;	// a non-zero LongnameFound value and
  1107                              <1> 	;	// if LFN_CheckSum value is equal to
  1108                              <1> 	;	// the next shortname checksum,
  1109                              <1> 	;	// long name is valid.
  1110                              <1> 	;	// If a longname is longer than 65 bytes,
  1111                              <1> 	;	// it is invalid for trdos. (>45h)
  1112                              <1>  
  1113 0000A444 57                  <1> 	push	edi
  1114 0000A445 56                  <1> 	push	esi
  1115                              <1> 	;push	ebx
  1116                              <1> 	;push	ecx
  1117                              <1> 	;push	edx
  1118 0000A446 50                  <1> 	push	eax
  1119                              <1>            
  1120 0000A447 29C9                <1> 	sub	ecx, ecx
  1121                              <1> 	;sub	eax, eax
  1122 0000A449 B11A                <1> 	mov	cl, 26
  1123                              <1> 
  1124 0000A44B 0FB607              <1> 	movzx	eax, byte [edi] ; LDIR_Order
  1125 0000A44E 3C41                <1> 	cmp	al, 41h  ; 40h (last long entry sign) + 1
  1126 0000A450 722B                <1> 	jb	short pass_pslnsc_last_long_entry
  1127                              <1> 
  1128 0000A452 88C4                <1> 	mov	ah, al
  1129 0000A454 80EC40              <1> 	sub	ah, 40h
  1130 0000A457 8825[82610100]      <1> 	mov	[LFN_EntryLength], ah
  1131                              <1> 	
  1132 0000A45D 3C45                <1> 	cmp	al, 45h  ; 40h (last long entry sign) + 5
  1133                              <1>  		; Max 130 byte length is usable in TRDOS
  1134                              <1> ; 26*5 = 130
  1135 0000A45F 7753                <1> 	ja	short loc_pslnsc_retn
  1136                              <1> 
  1137 0000A461 2407                <1> 	and	al, 07h ; 0Fh
  1138 0000A463 A2[81610100]        <1> 	mov	[LongNameFound], al
  1139                              <1> 
  1140 0000A468 FEC8                <1> 	dec	al
  1141                              <1> 	;mov	cl, 26
  1142 0000A46A F6E1                <1> 	mul	cl
  1143                              <1> 
  1144 0000A46C 89C6                <1> 	mov	esi, eax
  1145 0000A46E 01CE                <1> 	add	esi, ecx
  1146                              <1> 		; to make is an ASCIIZ string
  1147                              <1> 		; with ax+26 bytes length
  1148 0000A470 81C6[84610100]      <1> 	add	esi, LongFileName
  1149 0000A476 66C7060000          <1> 	mov	word [esi], 0   
  1150 0000A47B EB16                <1> 	jmp	short loc_pslsc_move_ldir_name2 
  1151                              <1> 
  1152                              <1> pass_pslnsc_last_long_entry:
  1153 0000A47D 3C04                <1> 	cmp	al, 04h
  1154 0000A47F 7733                <1> 	ja	short loc_pslnsc_retn
  1155 0000A481 FE0D[81610100]      <1> 	dec	byte [LongNameFound]
  1156 0000A487 3A05[81610100]      <1> 	cmp	al, [LongNameFound]
  1157 0000A48D 7525                <1> 	jne	short loc_pslnsc_retn
  1158                              <1> 
  1159                              <1> loc_pslsc_move_ldir_name1:
  1160 0000A48F FEC8                <1> 	dec	al
  1161                              <1> 	;mov	cl, 26
  1162 0000A491 F6E1                <1> 	mul	cl
  1163                              <1> 
  1164                              <1> loc_pslsc_move_ldir_name2:
  1165 0000A493 8A4F0D              <1> 	mov	cl, [edi+0Dh] ; long name checksum
  1166 0000A496 880D[83610100]      <1> 	mov	[LFN_CheckSum], cl 
  1167 0000A49C 89FE                <1> 	mov	esi, edi ; LDIR_Order
  1168 0000A49E BF[84610100]        <1> 	mov	edi, LongFileName
  1169 0000A4A3 01C7                <1> 	add	edi, eax
  1170 0000A4A5 46                  <1> 	inc	esi
  1171 0000A4A6 B105                <1> 	mov	cl, 5 ; chars 1 to 5
  1172 0000A4A8 F366A5              <1> 	rep	movsw
  1173 0000A4AB 83C603              <1> 	add	esi, 3
  1174 0000A4AE A5                  <1> 	movsd	; char 6 & 7 
  1175 0000A4AF A5                  <1> 	movsd	; char 8 & 9
  1176 0000A4B0 A5                  <1> 	movsd	; char 10 & 11
  1177 0000A4B1 46                  <1> 	inc	esi
  1178 0000A4B2 46                  <1> 	inc	esi 
  1179 0000A4B3 A5                  <1> 	movsd   ; char 12 & 13 
  1180                              <1> 
  1181                              <1> loc_pslnsc_retn:
  1182 0000A4B4 58                  <1>  	pop	eax
  1183                              <1> 	;pop	edx
  1184                              <1> 	;pop	ecx
  1185                              <1> 	;pop	ebx
  1186 0000A4B5 5E                  <1> 	pop	esi  
  1187 0000A4B6 5F                  <1> 	pop	edi
  1188                              <1>  
  1189 0000A4B7 C3                  <1>     	retn
  1190                              <1> 
  1191                              <1> parse_path_name:
  1192                              <1> 	; 10/02/2016
  1193                              <1> 	; 08/02/2016 (TRDOS 386 = TRDOS v2.0)
  1194                              <1> 	; 10/009/2011 ('proc_parse_pathname')
  1195                              <1> 	; 27/11/2009
  1196                              <1> 	; 05/12/2004
  1197                              <1> 	;
  1198                              <1> 	; INPUT ->
  1199                              <1> 	;	ESI = Beginning of ASCIIZ pathname string
  1200                              <1> 	;       EDI = Destination Address
  1201                              <1> 	;	      (which is TR-DOS FindFile data buffer)
  1202                              <1> 	; OUTPUT ->
  1203                              <1> 	;	CF = 1 -> Error
  1204                              <1> 	;	     EAX = Error Code (AL)
  1205                              <1> 	;
  1206                              <1> 	; (Modified registers: eax, ecx, esi, edi) 
  1207                              <1> 	
  1208                              <1> 	; Clear the pathname bytes in TR-DOS Findfile data buffer 
  1209 0000A4B8 57                  <1> 	push	edi
  1210 0000A4B9 B914000000          <1> 	mov	ecx, 20  ; 80 bytes
  1211 0000A4BE 31C0                <1> 	xor	eax, eax
  1212 0000A4C0 F3AB                <1> 	rep	stosd 
  1213 0000A4C2 5F                  <1> 	pop	edi
  1214                              <1> 
  1215 0000A4C3 668B06              <1> 	mov	ax, [esi]
  1216 0000A4C6 80FC3A              <1> 	cmp	ah, ':'
  1217 0000A4C9 741C                <1> 	je	short loc_ppn_change_drive
  1218 0000A4CB A0[86590100]        <1> 	mov	al, [Current_Drv]
  1219 0000A4D0 EB33                <1> 	jmp	short pass_ppn_change_drive
  1220                              <1> 
  1221                              <1> pass_ppn_cdir:
  1222 0000A4D2 8B35[A6620100]      <1> 	mov	esi, [First_Path_Pos]
  1223 0000A4D8 AC                  <1> 	lodsb
  1224                              <1> loc_ppn_get_filename:
  1225 0000A4D9 83C741              <1> 	add	edi, 65 ; FindFile_Name location
  1226                              <1> 	; TRDOS Filename length must not be more than 12 bytes
  1227                              <1> 	;mov	ecx, 12
  1228 0000A4DC B10C                <1> 	mov	cl, 12
  1229                              <1> loc_ppn_get_fnchar_next:
  1230 0000A4DE AA                  <1> 	stosb
  1231 0000A4DF AC                  <1> 	lodsb
  1232 0000A4E0 3C21                <1> 	cmp	al, 21h
  1233 0000A4E2 7274                <1> 	jb	short loc_ppn_clc_return 
  1234 0000A4E4 E2F8                <1>         loop    loc_ppn_get_fnchar_next
  1235                              <1> loc_ppn_return:
  1236 0000A4E6 C3                  <1> 	retn
  1237                              <1> 
  1238                              <1> loc_ppn_change_drive:
  1239 0000A4E7 24DF                <1> 	and	al, 0DFh
  1240 0000A4E9 2C41                <1> 	sub	al, 'A'; A:
  1241 0000A4EB 726F                <1> 	jc	short loc_ppn_invalid_drive
  1242 0000A4ED 3805[610D0100]      <1> 	cmp	[Last_DOS_DiskNo], al
  1243 0000A4F3 7267                <1> 	jb	short loc_ppn_invalid_drive
  1244                              <1> 
  1245 0000A4F5 46                  <1> 	inc	esi
  1246 0000A4F6 46                  <1> 	inc	esi
  1247 0000A4F7 8A26                <1> 	mov	ah, [esi]
  1248 0000A4F9 80FC21              <1> 	cmp	ah, 21h
  1249 0000A4FC 7307                <1> 	jnb	short pass_ppn_change_drive
  1250                              <1> 
  1251                              <1> loc_ppn_cmd_failed:
  1252                              <1> 	; File or directory name is not existing
  1253 0000A4FE 8807                <1> 	mov	[edi], al ; Drv 
  1254 0000A500 66B80100            <1> 	mov	ax, 1 ; eax = 1
  1255                              <1> 	; TR-DOS Error Code 01h = Bad Command Argument
  1256                              <1> 	; MS-DOS Error Code 01h : Invalid Function Number
  1257                              <1> 	;stc
  1258                              <1> 	; (MainProg ErrMsg: "Bad command or file name!")
  1259 0000A504 C3                  <1> 	retn
  1260                              <1> 
  1261                              <1> pass_ppn_change_drive:
  1262 0000A505 8935[A6620100]      <1> 	mov	[First_Path_Pos], esi
  1263 0000A50B C705[AA620100]0000- <1> 	mov	dword [Last_Slash_Pos], 0
  1263 0000A513 0000                <1>
  1264 0000A515 AA                  <1> 	stosb
  1265 0000A516 8A06                <1> 	mov	al, [esi]
  1266                              <1> loc_scan_ppn_dslash:
  1267 0000A518 3C2F                <1> 	cmp	al, '/'
  1268 0000A51A 7506                <1>   	jne	short loc_scan_next_slash_pos
  1269 0000A51C 8935[AA620100]      <1> 	mov	[Last_Slash_Pos], esi
  1270                              <1> loc_scan_next_slash_pos:
  1271 0000A522 46                  <1> 	inc	esi
  1272 0000A523 8A06                <1> 	mov	al, [esi]
  1273 0000A525 3C20                <1> 	cmp	al, 20h
  1274 0000A527 77EF                <1> 	ja	short loc_scan_ppn_dslash
  1275 0000A529 833D[AA620100]00    <1> 	cmp	dword [Last_Slash_Pos], 0
  1276 0000A530 76A0                <1> 	jna	short pass_ppn_cdir
  1277                              <1> 	
  1278 0000A532 8B0D[AA620100]      <1> 	mov	ecx, [Last_Slash_Pos]
  1279 0000A538 8B35[A6620100]      <1> 	mov	esi, [First_Path_Pos]
  1280 0000A53E 29F1                <1> 	sub	ecx, esi
  1281 0000A540 41                  <1> 	inc	ecx
  1282                              <1> 	;cmp	ecx, 64
  1283 0000A541 80F940              <1> 	cmp	cl, 64
  1284 0000A544 7715                <1> 	ja	short loc_ppn_invalid_drive_stc
  1285                              <1> 
  1286 0000A546 89F8                <1> 	mov	eax, edi ; Dest Dir String Location (65 byte)
  1287 0000A548 F3A4                <1> 	rep	movsb
  1288                              <1> 	;mov	[edi], cl ; 0, End of Dir String
  1289 0000A54A 8B35[AA620100]      <1> 	mov	esi, [Last_Slash_Pos]
  1290 0000A550 46                  <1> 	inc	esi
  1291 0000A551 89C7                <1> 	mov	edi, eax
  1292 0000A553 AC                  <1> 	lodsb
  1293 0000A554 3C21                <1> 	cmp	al, 21h
  1294 0000A556 7381                <1> 	jnb	short loc_ppn_get_filename
  1295                              <1> loc_ppn_clc_return:
  1296                              <1> 	;clc
  1297 0000A558 31C0                <1> 	xor	eax, eax
  1298 0000A55A C3                  <1> 	retn
  1299                              <1> 
  1300                              <1> loc_ppn_invalid_drive_stc:
  1301 0000A55B F5                  <1> 	cmc	 ; stc
  1302                              <1> loc_ppn_invalid_drive:
  1303                              <1> 	; cf = 1
  1304                              <1> 	; The Drive Letter/Char < "A" or > "Z"
  1305 0000A55C 66B80F00            <1> 	mov	ax, 0Fh
  1306                              <1> 	; MS-DOS Error Code 0Fh = Disk Drive Invalid 
  1307                              <1> 	; (MainProg ErrMsg: "Drive not ready or read error!")
  1308 0000A560 C3                  <1> 	retn
  1309                              <1> 
  1310                              <1> find_longname:
  1311                              <1> 	; 13/02/2016 (TRDOS 386 = TRDOS v2.0)
  1312                              <1> 	; 24/01/2010 (DIR.ASM, 'proc_find_longname')
  1313                              <1> 	; 17/10/2009
  1314                              <1> 	
  1315                              <1> 	; INPUT -> 
  1316                              <1> 	;	ESI = DOS short file name address
  1317                              <1> 	; 	for example: "filename.ext"
  1318                              <1> 	;
  1319                              <1> 	; OUTPUT ->
  1320                              <1> 	; 	ESI = ASCIIZ longname address (cf = 0)
  1321                              <1> 	;	cf = 1 -> error number returns in EAX (AL)
  1322                              <1> 	;	AL = 0 & CF=1 -> longname not found
  1323                              <1> 	;	     the file/directory has no longname
  1324                              <1> 	; 	cf = 0 -> AL = FAT Type 
  1325                              <1>  
  1326                              <1> 	; 17/10/2009
  1327                              <1> 	; ASCIIZ string will be returned
  1328                              <1> 	; as LongFileName
  1329                              <1> 	; clearing/reset is not needed
  1330                              <1> 	;mov	ecx, 33
  1331                              <1> 	;mov	edi, LongFileName
  1332                              <1> 	;sub	ax, ax ; 0
  1333                              <1> 	;rep	stosw
  1334                              <1> 
  1335                              <1> 	;mov	byte [LongNameFound], 0
  1336                              <1> 
  1337                              <1> 	; ESI = ASCIIZ file/directory name address
  1338                              <1> 	;   AL = Attributes AND mask 
  1339                              <1> 	;	(Result of AND must be equal to AL)
  1340                              <1> 	;   AH = Negative attributes mask 
  1341                              <1> 	;	(Result of AND must be ZERO)
  1342 0000A561 66B80008            <1> 	mov	ax, 0800h 
  1343                              <1> 		; it must not be volume name or longname
  1344 0000A565 E87DDDFFFF          <1> 	call	find_first_file
  1345 0000A56A 7216                <1> 	jc	short loc_fln_retn
  1346                              <1>  
  1347                              <1> loc_fln_check_FAT_Type:
  1348 0000A56C 803D[85590100]01    <1> 	cmp	byte [Current_FATType], 1
  1349 0000A573 7306                <1> 	jnb	short loc_fln_check_longname_yes_sign
  1350                              <1> 
  1351 0000A575 E839000000          <1> 	call	get_fs_longname
  1352 0000A57A C3                  <1> 	retn
  1353                              <1> 
  1354                              <1> loc_fln_check_longname_yes_sign:
  1355 0000A57B 08FF                <1> 	or	bh, bh
  1356 0000A57D 7504                <1> 	jnz	short loc_fln_check_longnamefound_number
  1357                              <1> loc_fln_longname_not_found_retn:
  1358 0000A57F 31C0                <1> 	xor	eax, eax 
  1359                              <1> 	; cf = 1 & al = 0 -> longname not found
  1360 0000A581 F9                  <1> 	stc
  1361                              <1> loc_fln_retn:
  1362 0000A582 C3                  <1> 	retn
  1363                              <1> 
  1364                              <1> loc_fln_check_longnamefound_number:
  1365                              <1> 	; 'LongNameFound' is set by
  1366                              <1>         ; by 'save_longname_sub_component'
  1367                              <1> 	; which is called from
  1368                              <1> 	; 'find_directory_entry' 
  1369                              <1> 	; which is called from 
  1370                              <1> 	; 'find_first_file'
  1371                              <1> 	; It must 1 if the longname is valid
  1372 0000A583 803D[81610100]01    <1>         cmp     byte [LongNameFound], 1
  1373 0000A58A 75F3                <1> 	jne	short loc_fln_longname_not_found_retn
  1374                              <1>              
  1375                              <1> loc_fln_calculate_checksum: 
  1376 0000A58C E813000000          <1> 	call	calculate_checksum
  1377                              <1> 	; AL = shortname checksum
  1378                              <1> 
  1379                              <1> loc_fln_longname_validation:
  1380                              <1> 	; 'LFN_CheckSum' has been set already
  1381                              <1> 	; by 'save_longname_sub_component'
  1382                              <1> 	; which is called from
  1383                              <1> 	; 'find_directory_entry' 
  1384                              <1> 	; which is called from 
  1385                              <1> 	; 'find_first_file'
  1386 0000A591 3805[83610100]      <1> 	cmp	[LFN_CheckSum], al
  1387 0000A597 75E6                <1> 	jne	short loc_fln_longname_not_found_retn
  1388                              <1> 
  1389 0000A599 BE[84610100]        <1> 	mov	esi, LongFileName
  1390 0000A59E A0[85590100]        <1> 	mov	al, [Current_FATType]
  1391 0000A5A3 C3                  <1> 	retn
  1392                              <1> 
  1393                              <1> calculate_checksum:
  1394                              <1> 	; 13/02/2016 (TRDOS 386 = TRDOS v2.0)
  1395                              <1> 	; 17/10/2009 (DIR.ASM, 'proc_calculate_checksum')
  1396                              <1>         ;    
  1397                              <1> 	; INPUT ->
  1398                              <1> 	;	ESI = 11 byte DOS File Name location
  1399                              <1> 	;	(in DOS Directory Entry Format)
  1400                              <1> 	; OUTPUT ->
  1401                              <1> 	;	 AL = 8 bit checksum (CRC) value
  1402                              <1> 	;
  1403                              <1> 	; (Modified registers: EAX, ECX, ESI)
  1404                              <1> 
  1405                              <1> 	; Erdogan Tan [ 17-10-2009 ]
  1406                              <1> 	;  'ror al, 1' instruction
  1407                              <1> 
  1408                              <1> 	; Erdogan Tan [ 20-06-2004 ]
  1409                              <1> 	; This 8086 assembly code is an original code
  1410                              <1> 	; which is adapted from C code in
  1411                              <1> 	; Microsoft FAT32 File System Specification
  1412                              <1> 	; Version 1.03, December 6, 2000
  1413                              <1> 	; Page 28
  1414                              <1> 
  1415 0000A5A4 30C0                <1> 	xor	al, al
  1416 0000A5A6 B90B000000          <1> 	mov	ecx, 11
  1417                              <1> loc_next_sum:
  1418                              <1> 	;xor	ah, ah
  1419                              <1> 	;test	al, 1
  1420                              <1> 	;jz	short pass_ah_80h
  1421                              <1> 	;mov	ah, 80h
  1422                              <1> ;pass_ah_80h:
  1423                              <1> 	;shr	al, 1
  1424 0000A5AB D0C8                <1> 	ror	al, 1 ; 17/10/2009  
  1425 0000A5AD 0206                <1> 	add	al, [esi]
  1426 0000A5AF 46                  <1> 	inc	esi
  1427                              <1> 	;add	al, ah
  1428 0000A5B0 E2F9                <1> 	loop	loc_next_sum
  1429 0000A5B2 C3                  <1> 	retn
  1430                              <1> 
  1431                              <1> get_fs_longname:
  1432                              <1> 	; temporary (13/02/2016)
  1433 0000A5B3 31C0                <1> 	xor eax, eax
  1434 0000A5B5 F9                  <1> 	stc
  1435 0000A5B6 C3                  <1> 	retn
  1436                              <1> 
  1437                              <1> make_sub_directory:
  1438                              <1> 	; 16/10/2016
  1439                              <1> 	; 02/03/2016, 03/03/2016
  1440                              <1> 	; 26/02/2016, 27/02/2016
  1441                              <1> 	; 21/02/2016 (TRDOS 386 = TRDOS v2.0)
  1442                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_make_directory')
  1443                              <1> 	; 10/07/2010
  1444                              <1> 	; INPUT ->
  1445                              <1> 	; 	ESI = ASCIIZ Directory Name
  1446                              <1> 	;	CL = Directory Attributes
  1447                              <1> 	; OUTPUT ->
  1448                              <1> 	;	EAX = New sub dir's first cluster
  1449                              <1> 	;	ESI = Logical Dos Drv Descr. Table Addr.
  1450                              <1> 	;	CF = 1 -> error code in AL (EAX)
  1451                              <1> 
  1452                              <1> 	;test	cl, 10h  ; directory
  1453                              <1> 	;jz	short loc_make_directory_access_denied
  1454                              <1> 	;test	cl, 08h ; volume name
  1455                              <1> 	;jnz	short loc_make_directory_access_denied
  1456                              <1> 
  1457 0000A5B7 80E107              <1> 	and	cl, 07h
  1458 0000A5BA 880D[00630100]      <1> 	mov	byte [mkdir_attrib], cl
  1459                              <1> 
  1460 0000A5C0 56                  <1> 	push	esi
  1461 0000A5C1 31DB                <1> 	xor	ebx, ebx
  1462 0000A5C3 8A3D[86590100]      <1> 	mov	bh, [Current_Drv]
  1463 0000A5C9 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1464 0000A5CE 01DE                <1> 	add	esi, ebx
  1465 0000A5D0 5B                  <1> 	pop	ebx
  1466                              <1> 
  1467                              <1> 	; 10/07/2010 -> 1st writable disk check for trdos
  1468                              <1> 	; LD_DiskType = 0 for write protection (read only) 
  1469 0000A5D1 807E0101            <1> 	cmp	byte [esi+LD_DiskType], 1 ; 0 = Invalid
  1470 0000A5D5 730B                <1> 	jnb	short loc_mkdir_check_file_sytem
  1471                              <1> 	; 16/10/2016 (13h -> 30)
  1472 0000A5D7 B81E000000          <1> 	mov	eax, 30 ; 'Disk write-protected' error
  1473 0000A5DC BA00000000          <1> 	mov	edx, 0
  1474                              <1> 	; err retn: EDX = 0, EBX = Dir name offset
  1475                              <1> 	;ESI = Logical DOS drive description table address
  1476 0000A5E1 C3                  <1> 	retn
  1477                              <1> 
  1478                              <1> ;loc_make_directory_access_denied:
  1479                              <1> 	;mov	ax, 05h ; access denied (invalid attributes input)
  1480                              <1> 	;stc
  1481                              <1> 	;retn
  1482                              <1> 
  1483                              <1> loc_mkdir_check_file_sytem:
  1484 0000A5E2 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  1485 0000A5E6 730B                <1> 	jnb	short loc_mkdir_check_free_sectors
  1486                              <1> 
  1487                              <1> loc_make_fs_directory:
  1488 0000A5E8 A1[80590100]        <1> 	mov	eax, [Current_Dir_FCluster]
  1489                              <1> 	; EAX = Parent directory DDT Address
  1490                              <1> 	; ESI = Logical DOS Drive DT Address
  1491                              <1> 	; EBX = Directory name offset (as ASCIIZ name)
  1492 0000A5ED E8D5150000          <1> 	call	make_fs_directory
  1493 0000A5F2 C3                  <1> 	retn
  1494                              <1> 
  1495                              <1> loc_mkdir_check_free_sectors:
  1496 0000A5F3 0FB64613            <1>         movzx   eax, byte [esi+LD_BPB+SecPerClust]
  1497 0000A5F7 8B4E74              <1> 	mov	ecx, [esi+LD_FreeSectors]
  1498 0000A5FA 39C1                <1> 	cmp	ecx, eax
  1499 0000A5FC 7255                <1> 	jb	short loc_mkdir_insufficient_disk_space
  1500                              <1> 
  1501                              <1> loc_make_fat_directory:
  1502 0000A5FE 891D[F0620100]      <1> 	mov	[mkdir_DirName_Offset], ebx
  1503 0000A604 890D[FC620100]      <1> 	mov	[mkdir_FreeSectors], ecx
  1504                              <1> 
  1505                              <1> 	;mov	al, [esi+LD_BPB+SecPerClust]
  1506 0000A60A A2[02630100]        <1> 	mov	byte [mkdir_SecPerClust], al
  1507                              <1> 
  1508                              <1> loc_mkdir_gffc_1:
  1509 0000A60F E80F180000          <1> 	call	get_first_free_cluster
  1510 0000A614 722A                <1> 	jc	short loc_mkdir_gffc_retn
  1511                              <1> 
  1512                              <1> ;loc_mkdir_gffc_1_cont: 
  1513                              <1> 	;cmp	eax, 2
  1514                              <1> 	;jb	short loc_mkdir_gffc_insufficient_disk_space
  1515                              <1> 
  1516                              <1> ;loc_mkdir_gffc_1_save_fcluster:  
  1517 0000A616 A3[F4620100]        <1> 	mov	[mkdir_FFCluster], eax
  1518                              <1> 
  1519                              <1> loc_mkdir_locate_ffe:
  1520                              <1> 	; Current directory fcluster <> Directory buffer cluster
  1521                              <1> 	; Current directory will be reloaded by
  1522                              <1> 	; 'locate_current_dir_file' procedure
  1523                              <1> 	;
  1524                              <1> 	; ESI = Logical DOS Drive Description Table Address 
  1525                              <1> 	;push	esi ; 27/02/2016
  1526 0000A61B 31C0                <1> 	xor	eax, eax
  1527 0000A61D 89C1                <1>         mov	ecx, eax
  1528 0000A61F 6649                <1> 	dec	cx ; FFFFh  
  1529                              <1> 	; CX = FFFFh -> find first deleted or free entry
  1530                              <1> 	; ESI would be ASCIIZ filename address if the call
  1531                              <1> 	; would not be for first free or deleted dir entry
  1532 0000A621 E8D0FAFFFF          <1> 	call	locate_current_dir_file
  1533 0000A626 734C                <1> 	jnc	short loc_mkdir_set_ff_dir_entry_1
  1534                              <1> 	;pop	esi 
  1535                              <1> 	; ESI = Logical DOS Drive Description Table Address 
  1536 0000A628 83F802              <1> 	cmp	eax, 2  ; cmp al, 2 ; File/Dir not found !
  1537 0000A62B 752B                <1> 	jne	short loc_mkdir_stc_return
  1538                              <1> 
  1539                              <1> loc_mkdir_add_new_cluster:
  1540 0000A62D 3805[85590100]      <1> 	cmp	byte [Current_FATType], al ; 2
  1541                              <1> 	;cmp	byte ptr [esi+LD_FATType], 2
  1542 0000A633 770C                <1> 	ja	short loc_mkdir_add_new_cluster_check_fsc
  1543 0000A635 803D[84590100]01    <1> 	cmp	byte [Current_Dir_Level], 1
  1544                              <1> 	;cmp	byte [esi+LD_CDirLevel], 1
  1545 0000A63C 7303                <1> 	jnb	short loc_mkdir_add_new_cluster_check_fsc
  1546                              <1> 
  1547 0000A63E B00C                <1> 	mov	al, 12 ; No more files 
  1548                              <1> loc_mkdir_gffc_retn:
  1549 0000A640 C3                  <1> 	retn
  1550                              <1> 
  1551                              <1> loc_mkdir_add_new_cluster_check_fsc:
  1552 0000A641 8B0D[FC620100]      <1> 	mov	ecx, [mkdir_FreeSectors]
  1553                              <1> 	;movzx	eax, byte [mkdir_SecPerClust]
  1554 0000A647 A0[02630100]        <1> 	mov	al, [mkdir_SecPerClust]
  1555 0000A64C 66D1E0              <1> 	shl	ax, 1 ; AX = 2 * AX
  1556 0000A64F 39C1                <1> 	cmp	ecx, eax
  1557 0000A651 7350                <1> 	jnb	short loc_mkdir_add_new_subdir_cluster
  1558                              <1> 
  1559                              <1> loc_mkdir_insufficient_disk_space:
  1560                              <1> 	;mov	edx, ecx
  1561                              <1> ;loc_mkdir_gffc_insufficient_disk_space:
  1562 0000A653 66B82700            <1> 	mov	ax, 27h ; MSDOS err => insufficient disk space
  1563                              <1> 	; err retn: EDX = Free sectors, EBX = Dir name offset
  1564                              <1>         ; ESI -> Dos drive description table address
  1565                              <1> 	;; ecx = edx
  1566                              <1> 	;
  1567 0000A657 C3                  <1> 	retn
  1568                              <1> 
  1569                              <1> loc_mkdir_stc_return:
  1570 0000A658 F9                  <1> 	stc
  1571 0000A659 C3                  <1> 	retn 
  1572                              <1> 
  1573                              <1> loc_mkdir_gffc_2:
  1574 0000A65A E8C4170000          <1> 	call	get_first_free_cluster
  1575 0000A65F 72DF                <1> 	jc	short loc_mkdir_gffc_retn
  1576                              <1> 
  1577                              <1> ;loc_mkdir_gffc_1_cont: 
  1578                              <1> 	;cmp	eax, 2
  1579                              <1> 	;jb	short loc_mkdir_gffc_insufficient_disk_space
  1580                              <1> 
  1581                              <1> ;loc_mkdir_gffc_2_save_fcluster:  
  1582 0000A661 A3[F4620100]        <1> 	mov	[mkdir_FFCluster], eax
  1583                              <1> 
  1584 0000A666 A1[F8620100]        <1> 	mov	eax, [mkdir_LastDirCluster]
  1585                              <1> 
  1586 0000A66B E842170000          <1> 	call	load_FAT_sub_directory 
  1587 0000A670 72CE                <1> 	jc	short loc_mkdir_gffc_retn
  1588                              <1> 
  1589 0000A672 31FF                <1> 	xor	edi, edi
  1590                              <1> loc_mkdir_set_ff_dir_entry_1:
  1591                              <1> 	; 27/02/2016
  1592 0000A674 56                  <1> 	push	esi ; Logical DOS Drv Desc. Tbl. address
  1593                              <1> 	; EDI = Directory Entry Address
  1594 0000A675 8B35[F0620100]      <1> 	mov	esi, [mkdir_DirName_Offset]
  1595 0000A67B A1[F4620100]        <1> 	mov	eax, [mkdir_FFCluster]
  1596                              <1> 
  1597 0000A680 66B91000            <1> 	mov	cx, 10h	; CL = Directory attribute
  1598                              <1> 			; CH = 0 -> File size is 0
  1599 0000A684 0A0D[00630100]      <1> 	or	cl, [mkdir_attrib] ; S, H, R  
  1600 0000A68A E8B0010000          <1> 	call	make_directory_entry
  1601                              <1> 
  1602 0000A68F 5E                  <1> 	pop	esi
  1603                              <1> 
  1604 0000A690 C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  1605 0000A697 E880020000          <1> 	call	save_directory_buffer
  1606 0000A69C 0F83DA000000        <1>         jnc     loc_mkdir_set_ff_dir_entry_2
  1607                              <1> 
  1608                              <1> loc_mkdir_return:
  1609 0000A6A2 C3                  <1> 	retn
  1610                              <1> 
  1611                              <1> loc_mkdir_add_new_subdir_cluster:
  1612 0000A6A3 8B15[B1600100]      <1> 	mov	edx, [DirBuff_Cluster]
  1613 0000A6A9 8915[F8620100]      <1> 	mov	[mkdir_LastDirCluster], edx       
  1614                              <1> 
  1615 0000A6AF A1[F4620100]        <1> 	mov	eax, [mkdir_FFCluster]
  1616 0000A6B4 E8F9160000          <1> 	call	load_FAT_sub_directory 
  1617 0000A6B9 72E7                <1> 	jc	short loc_mkdir_return
  1618                              <1> 	; eax = 0
  1619                              <1> 	; ecx =  directory buffer sector count (<= 128)
  1620                              <1> 
  1621                              <1> pass_mkdir_add_new_subdir_cluster:
  1622 0000A6BB 29FF                <1> 	sub	edi, edi ; 0
  1623                              <1> 	;mov	al, 128 ; double word
  1624                              <1> 	;mul	ecx ; ecx =  directory buffer sector count
  1625                              <1> 	;mov	ecx, eax
  1626                              <1> 	;shl	cx, 7 ; 128 * sector count	
  1627 0000A6BD 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec] ; 512
  1628 0000A6C1 66C1E802            <1> 	shr	ax, 2 ; 'byte count / 4' for 'stosd'
  1629 0000A6C5 66F7E1              <1> 	mul	cx ; max = 128*(512/4) -> 16384 (stosd)
  1630 0000A6C8 6689C1              <1> 	mov	cx, ax
  1631 0000A6CB 6629C0              <1> 	sub	ax, ax ; 0
  1632 0000A6CE F3AB                <1> 	rep	stosd ; clear directory buffer
  1633                              <1> 
  1634 0000A6D0 C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  1635 0000A6D7 E840020000          <1> 	call	save_directory_buffer 
  1636 0000A6DC 72C4                <1> 	jc	short loc_mkdir_return
  1637                              <1> 
  1638                              <1> loc_mkdir_save_added_cluster:
  1639 0000A6DE A1[F8620100]        <1> 	mov	eax, [mkdir_LastDirCluster]
  1640 0000A6E3 8B0D[F4620100]      <1> 	mov	ecx, [mkdir_FFCluster]
  1641                              <1> 	; 01/03/2016
  1642 0000A6E9 31D2                <1> 	xor	edx, edx
  1643 0000A6EB 8915[A2600100]      <1> 	mov	[FAT_ClusterCounter], edx ; 0 ; reset
  1644 0000A6F1 E800180000          <1> 	call	update_cluster
  1645 0000A6F6 7304                <1> 	jnc	short loc_mkdir_save_fat_buffer_0
  1646 0000A6F8 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  1647 0000A6FA 7518                <1> 	jnz	short loc_mkdir_save_fat_buffer_stc_retn
  1648                              <1> 
  1649                              <1> loc_mkdir_save_fat_buffer_0:
  1650 0000A6FC A1[F4620100]        <1> 	mov	eax, [mkdir_FFCluster]
  1651 0000A701 A3[F8620100]        <1> 	mov	[mkdir_LastDirCluster], eax
  1652                              <1> 
  1653 0000A706 31C9                <1> 	xor	ecx, ecx
  1654 0000A708 49                  <1> 	dec	ecx ; FFFFFFFFh
  1655                              <1> 	; ESI = Logical DOS Drive Description Table address 
  1656 0000A709 E8E8170000          <1> 	call	update_cluster
  1657 0000A70E 731A                <1> 	jnc	short loc_mkdir_save_fat_buffer_1
  1658 0000A710 09C0                <1> 	or	eax, eax
  1659 0000A712 7416                <1> 	jz	short loc_mkdir_save_fat_buffer_1
  1660                              <1> 
  1661                              <1> loc_mkdir_save_fat_buffer_stc_retn:
  1662                              <1> 	; 01/03/2016
  1663 0000A714 803D[A2600100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  1664 0000A71B 720C                <1> 	jb	short loc_mkdir_save_fat_buffer_retn
  1665                              <1> 
  1666 0000A71D 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free space (BL = 0)
  1667                              <1> 			   ; (BH = FFh -> Use ESI as Drv Param. Tbl.)
  1668 0000A721 50                  <1> 	push	eax
  1669 0000A722 E8211B0000          <1> 	call	calculate_fat_freespace
  1670 0000A727 58                  <1> 	pop	eax
  1671 0000A728 F9                  <1> 	stc
  1672                              <1> loc_mkdir_save_fat_buffer_retn:
  1673 0000A729 C3                  <1> 	retn
  1674                              <1> 
  1675                              <1> loc_mkdir_save_fat_buffer_1:
  1676                              <1> 	; byte [FAT_BuffValidData] = 2 
  1677 0000A72A E8841A0000          <1> 	call	save_fat_buffer
  1678 0000A72F 72E3                <1> 	jc	short loc_mkdir_save_fat_buffer_stc_retn
  1679                              <1> 
  1680                              <1> 	; 01/03/2016
  1681 0000A731 803D[A2600100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  1682 0000A738 721B                <1> 	jb	short loc_mkdir_save_fat_buffer_2
  1683                              <1> 
  1684                              <1> 	; ESI = Logical DOS Drive Description Table address 
  1685 0000A73A A1[A2600100]        <1> 	mov	eax, [FAT_ClusterCounter]
  1686 0000A73F 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  1687 0000A743 E8001B0000          <1> 	call	calculate_fat_freespace
  1688                              <1> 
  1689                              <1> 	;inc	eax ; 0FFFFFFFFh -> 0 ; recalculation is needed!
  1690                              <1> 	;jnz	short loc_mkdir_save_fat_buffer_2
  1691                              <1> 
  1692                              <1> 	; ecx > 0 -> Recalculation is needed
  1693 0000A748 09C9                <1> 	or	ecx, ecx 
  1694 0000A74A 7409                <1> 	jz	short loc_mkdir_save_fat_buffer_2
  1695                              <1> 
  1696 0000A74C 66BB00FF            <1> 	mov	bx, 0FF00h ; ; recalculate free space
  1697 0000A750 E8F31A0000          <1> 	call	calculate_fat_freespace
  1698                              <1> 
  1699                              <1> loc_mkdir_save_fat_buffer_2:
  1700 0000A755 C605[03630100]01    <1> 	mov	byte [mkdir_add_new_cluster], 1
  1701 0000A75C E9C4000000          <1> 	jmp	loc_mkdir_upd_parent_dir_lmdt
  1702                              <1> 
  1703                              <1> loc_mkdir_update_sub_dir_cluster:
  1704 0000A761 A1[F4620100]        <1> 	mov	eax, [mkdir_FFCluster]
  1705 0000A766 29C9                <1> 	sub	ecx, ecx ; 0
  1706                              <1> 	; 01/03/2016
  1707 0000A768 890D[A2600100]      <1> 	mov	[FAT_ClusterCounter], ecx ; 0 ; Reset
  1708 0000A76E 49                  <1> 	dec	ecx ; 0FFFFFFFFh
  1709                              <1> 
  1710                              <1> 	; ESI = Logical DOS Drive Descisption Table address  
  1711 0000A76F E882170000          <1> 	call	update_cluster
  1712 0000A774 7379                <1> 	jnc	short loc_mkdir_save_fat_buffer_3
  1713 0000A776 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  1714 0000A778 7475                <1> 	jz	short loc_mkdir_save_fat_buffer_3
  1715                              <1> 	; 01/03/2016
  1716 0000A77A EB98                <1> 	jmp	short loc_mkdir_save_fat_buffer_stc_retn
  1717                              <1> 
  1718                              <1> loc_mkdir_set_ff_dir_entry_2:
  1719                              <1> 	; ESI = Logical DOS Drive Description Table address  
  1720 0000A77C A1[F4620100]        <1> 	mov	eax, [mkdir_FFCluster]
  1721                              <1> 	; Load disk sectors as a directory cluster
  1722 0000A781 E82C160000          <1> 	call	load_FAT_sub_directory 
  1723 0000A786 7266                <1> 	jc	short retn_make_fat_directory
  1724                              <1> 	
  1725                              <1> 	; eax = 0
  1726                              <1> 	; ecx =  directory buffer sector count (<= 128)
  1727                              <1> 
  1728 0000A788 BF40000800          <1> 	mov	edi, Directory_Buffer + 64 ; 26/02/2016
  1729                              <1> 
  1730                              <1> 	; 02/03/2016
  1731 0000A78D 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec] ; 512
  1732 0000A791 66C1E802            <1> 	shr	ax, 2 ; 'byte count / 4' for 'stosd'
  1733 0000A795 F7E1                <1> 	mul 	ecx
  1734 0000A797 89C1                <1> 	mov	ecx, eax
  1735 0000A799 6629C0              <1> 	sub	ax, ax
  1736 0000A79C F3AB                <1> 	rep	stosd
  1737                              <1> 
  1738                              <1> 	;;mov	al, 128 ; double word
  1739                              <1> 	;;mul	ecx ; ecx =  directory buffer sector count
  1740                              <1> 	;;mov	ecx, eax
  1741                              <1> 	;shl	cx, 7 ; 128 * sector count	
  1742                              <1> 	;;sub	eax, eax
  1743                              <1> 	;;sub	al, al ; 0
  1744                              <1> 	;rep	stosd ; clear directory buffer
  1745                              <1> 
  1746 0000A79E BF00000800          <1> 	mov	edi, Directory_Buffer ; 26/02/2016
  1747                              <1> 	
  1748 0000A7A3 56                  <1> 	push	esi
  1749                              <1> 
  1750 0000A7A4 BE[04630100]        <1> 	mov	esi, mkdir_Name
  1751 0000A7A9 66C7062E00          <1> 	mov	word [esi], 2Eh ; db '.', '0'
  1752                              <1> 
  1753 0000A7AE A1[F4620100]        <1> 	mov	eax, [mkdir_FFCluster]
  1754 0000A7B3 66B91000            <1> 	mov	cx, 10h ; CL = Directory attribute
  1755                              <1> 			; CH = 0 -> File size is 0
  1756 0000A7B7 E883000000          <1> 	call	make_directory_entry
  1757                              <1> 
  1758 0000A7BC BF20000800          <1> 	mov	edi, Directory_Buffer + 32 ; 26/02/2016
  1759                              <1> 
  1760                              <1> 	; 03/03/2016
  1761                              <1> 	; Following modification has been done according to 
  1762                              <1> 	; 'Microsoft Extensible Firmware Initiative
  1763                              <1> 	; FAT32 File System Specification' document,
  1764                              <1> 	; 'FAT: General Overview of On-Disk FormatPage 25'.
  1765                              <1> 	; "Finally, you set DIR_FstClusLO and DIR_FstClusHI
  1766                              <1> 	; for the dotdot entry (the second entry) to the
  1767                              <1> 	; first cluster number of the directory in which you 
  1768                              <1> 	; just created the directory (value is 0 if this directory
  1769                              <1> 	; is the root directory even for FAT32 volumes)."
  1770                              <1> 	; (Correctness of this modification has been verified
  1771                              <1> 	;  by using Windows 98 'scandisk.exe'.)
  1772                              <1> 
  1773 0000A7C1 29C0                <1> 	sub	eax, eax
  1774 0000A7C3 3805[84590100]      <1> 	cmp	byte [Current_Dir_Level], al ; 0
  1775 0000A7C9 7605                <1> 	jna	short loc_mkdir_set_ff_dir_entry_3
  1776 0000A7CB A1[80590100]        <1> 	mov	eax, [Current_Dir_FCluster] ; parent dir
  1777                              <1> loc_mkdir_set_ff_dir_entry_3:
  1778 0000A7D0 66C746012E00        <1> 	mov	word [esi+1], 2Eh ; db '.', '0'
  1779                              <1> 
  1780                              <1> 	;mov	cx, 10h
  1781 0000A7D6 E864000000          <1> 	call	make_directory_entry
  1782                              <1> 
  1783 0000A7DB 5E                  <1> 	pop	esi
  1784                              <1> 
  1785 0000A7DC C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  1786 0000A7E3 E834010000          <1> 	call	save_directory_buffer
  1787 0000A7E8 0F8373FFFFFF        <1>         jnc     loc_mkdir_update_sub_dir_cluster
  1788                              <1>  
  1789                              <1> retn_make_fat_directory:
  1790 0000A7EE C3                  <1> 	retn
  1791                              <1> 
  1792                              <1> loc_mkdir_save_fat_buffer_3:
  1793                              <1> 	; 01/03/2016
  1794                              <1> 	; byte [FAT_BuffValidData] = 2 
  1795 0000A7EF E8BF190000          <1> 	call	save_fat_buffer
  1796 0000A7F4 0F821AFFFFFF        <1>         jc      loc_mkdir_save_fat_buffer_stc_retn
  1797                              <1> 
  1798 0000A7FA 803D[A2600100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  1799 0000A801 721B                <1> 	jb	short loc_mkdir_save_fat_buffer_4
  1800                              <1> 
  1801                              <1> 	; ESI = Logical DOS Drive Description Table address 
  1802 0000A803 A1[A2600100]        <1> 	mov	eax, [FAT_ClusterCounter]
  1803 0000A808 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  1804 0000A80C E8371A0000          <1> 	call	calculate_fat_freespace
  1805                              <1> 
  1806                              <1> 	;inc	eax ; 0FFFFFFFFh -> 0 ; recalculation is needed!
  1807                              <1>         ;jnz    short loc_mkdir_save_fat_buffer_4
  1808                              <1> 
  1809                              <1> 	; ecx > 0 -> Recalculation is needed
  1810 0000A811 09C9                <1> 	or	ecx, ecx 
  1811 0000A813 7409                <1>         jz      short loc_mkdir_save_fat_buffer_4
  1812                              <1> 
  1813 0000A815 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free space
  1814 0000A819 E82A1A0000          <1> 	call	calculate_fat_freespace
  1815                              <1> 
  1816                              <1> loc_mkdir_save_fat_buffer_4:	
  1817 0000A81E C605[03630100]00    <1> 	mov	byte [mkdir_add_new_cluster], 0
  1818                              <1> 
  1819                              <1> loc_mkdir_upd_parent_dir_lmdt:
  1820 0000A825 E88D010000          <1> 	call	update_parent_dir_lmdt
  1821                              <1> 
  1822                              <1> 	; 01/03/2016
  1823 0000A82A 803D[03630100]00    <1> 	cmp	byte [mkdir_add_new_cluster], 0
  1824 0000A831 0F8723FEFFFF        <1>         ja      loc_mkdir_gffc_2
  1825                              <1> 
  1826                              <1> loc_mkdir_retn_new_dir_cluster:
  1827 0000A837 A1[F4620100]        <1> 	mov	eax, [mkdir_FFCluster]
  1828 0000A83C 31D2                <1> 	xor	edx, edx
  1829                              <1> loc_mkdir_retn:
  1830 0000A83E C3                  <1> 	retn
  1831                              <1> 
  1832                              <1> make_directory_entry:
  1833                              <1> 	; 02/03/2016
  1834                              <1> 	; 21/02/2016 (TRDOS 386 = TRDOS v2.0)
  1835                              <1> 	; 09/08/2010 (DIR.ASM, 'proc_make_directory_entry')
  1836                              <1> 	; 17/07/2010
  1837                              <1> 	; INPUT ->
  1838                              <1> 	; 	EDI = Directory Entry Address
  1839                              <1> 	;	ESI = Dot File Name Location
  1840                              <1> 	;	EAX = First Cluster
  1841                              <1> 	;	File Size = 0 (Must be set later)
  1842                              <1> 	;	CL = Attributes
  1843                              <1> 	;	CH = 0 (File size = 0) 
  1844                              <1> 	;	(If CH>0, File size is in dword [EBX]) (*)
  1845                              <1> 	; OUTPUT -> 
  1846                              <1> 	;	EDI = Directory Entry Address
  1847                              <1> 	;	ESI = Dot File Name Location (Capitalized)
  1848                              <1> 	;	If CH input = 0, File Size = 0
  1849                              <1> 	;	Otherwise file size is as dword [EBX] (*)
  1850                              <1> 	;	DX = Date, AX = Time in DOS Dir Entry format
  1851                              <1> 	;	EBX = same
  1852                              <1> 	;	ECX = same
  1853                              <1> 
  1854 0000A83F 51                  <1> 	push	ecx
  1855                              <1> 
  1856 0000A840 884F0B              <1> 	mov	[edi+11], cl ; Attributes
  1857 0000A843 6689471A            <1> 	mov	[edi+26], ax ; FClusterLw, 26
  1858 0000A847 C1E810              <1> 	shr	eax, 16
  1859 0000A84A 66894714            <1> 	mov	[edi+20], ax ; FClusterHw, 20
  1860 0000A84E 6631C0              <1> 	xor	ax, ax 
  1861 0000A851 6689470C            <1> 	mov	[edi+12], ax ; NTReserved, 12
  1862                              <1> 			     ; CrtTimeTenth, 13
  1863 0000A855 08ED                <1> 	or	ch, ch
  1864 0000A857 7402                <1> 	jz	short loc_make_direntry_set_filesize
  1865                              <1> 
  1866 0000A859 8B03                <1> 	mov	eax, [ebx]
  1867                              <1>         
  1868                              <1> loc_make_direntry_set_filesize:
  1869 0000A85B 89471C              <1> 	mov	[edi+28], eax ; FileSize, 28
  1870                              <1> 	
  1871 0000A85E E88AFBFFFF          <1> 	call	convert_file_name
  1872                              <1> 	;EDI = Dir Entry Format File Name Location
  1873                              <1> 	;ESI = Dot File Name Location (capitalized)
  1874                              <1> 
  1875 0000A863 E816000000          <1> 	call	convert_current_date_time
  1876                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  1877                              <1>         ; 	    AX = Time in dos dir entry format
  1878 0000A868 6689470E            <1> 	mov	[edi+14], ax ; CrtTime, 14
  1879 0000A86C 66895710            <1> 	mov	[edi+16], dx ; CrtDate, 16
  1880 0000A870 66895712            <1> 	mov	[edi+18], dx ; LastAccDate, 18
  1881 0000A874 66894716            <1> 	mov	[edi+22], ax ; WrtTime, 14
  1882 0000A878 66895718            <1> 	mov	[edi+24], dx ; WrtDate, 16
  1883 0000A87C 59                  <1> 	pop	ecx
  1884                              <1> 
  1885 0000A87D C3                  <1> 	retn
  1886                              <1> 
  1887                              <1> convert_current_date_time:
  1888                              <1> 	; 21/02/2016 (TRDOS 386 = TRDOS v2.0)
  1889                              <1> 	; 13/06/2010 (DIR.ASM, 'proc_convert_current_date_time')
  1890                              <1> 	; converts date&time to dos dir entry format
  1891                              <1> 	; INPUT -> none
  1892                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  1893                              <1> 	;           AX = Time in dos dir entry format
  1894                              <1>  
  1895 0000A87E B404                <1> 	mov	ah, 04h ; Return Current Date
  1896 0000A880 E852B1FFFF          <1> 	call	int1Ah 
  1897                              <1> 
  1898 0000A885 88E8                <1> 	mov	al, ch ; <- century BCD
  1899 0000A887 240F                <1> 	and	al, 0Fh
  1900 0000A889 88EC                <1> 	mov	ah, ch
  1901 0000A88B C0EC04              <1> 	shr	ah, 4
  1902 0000A88E D50A                <1> 	aad
  1903 0000A890 88C5                <1> 	mov	ch, al ; -> century 
  1904                              <1> 
  1905 0000A892 88C8                <1> 	mov	al, cl ; <- year BCD
  1906 0000A894 240F                <1> 	and	al, 0Fh
  1907 0000A896 88CC                <1> 	mov	ah, cl
  1908 0000A898 C0EC04              <1> 	shr	ah, 4
  1909 0000A89B D50A                <1> 	aad
  1910 0000A89D 88C1                <1> 	mov	cl, al ; -> year
  1911                              <1> 
  1912 0000A89F 88E8                <1> 	mov	al, ch
  1913 0000A8A1 B464                <1> 	mov	ah, 100
  1914 0000A8A3 F6E4                <1> 	mul	ah
  1915 0000A8A5 30ED                <1> 	xor	ch, ch
  1916 0000A8A7 6601C8              <1> 	add	ax, cx
  1917 0000A8AA 662DBC07            <1> 	sub	ax, 1980 ; ms-dos epoch
  1918 0000A8AE 6689C1              <1> 	mov	cx, ax
  1919                              <1> 
  1920 0000A8B1 88F0                <1> 	mov	al, dh ; <- month in bcd
  1921 0000A8B3 240F                <1> 	and	al, 0Fh
  1922 0000A8B5 88F4                <1> 	mov	ah, dh
  1923 0000A8B7 C0EC04              <1> 	shr	ah, 4
  1924 0000A8BA D50A                <1> 	aad
  1925 0000A8BC 88C6                <1> 	mov	dh, al ; -> month
  1926                              <1> 
  1927 0000A8BE 88D0                <1> 	mov	al, dl ; <- day BCD
  1928 0000A8C0 240F                <1> 	and	al, 0Fh
  1929 0000A8C2 88D4                <1> 	mov	ah, dl
  1930 0000A8C4 C0EC04              <1> 	shr	ah, 4
  1931 0000A8C7 D50A                <1> 	aad
  1932 0000A8C9 88C2                <1> 	mov	dl, al ; -> day
  1933                              <1> 
  1934 0000A8CB 88C8                <1> 	mov	al, cl ; count of years from 1980
  1935 0000A8CD 66C1E004            <1> 	shl	ax, 4
  1936 0000A8D1 08F0                <1> 	or	al, dh ; month of year, 1 to 12
  1937 0000A8D3 66C1E005            <1> 	shl	ax, 5
  1938 0000A8D7 08D0                <1> 	or	al, dl ; day of year, 1 to 31
  1939                              <1> 	
  1940 0000A8D9 6650                <1> 	push	ax ; push date
  1941                              <1> 
  1942 0000A8DB B402                <1> 	mov	ah, 02h ; Return Current Time
  1943 0000A8DD E8F5B0FFFF          <1> 	call	int1Ah
  1944                              <1> 
  1945 0000A8E2 88E8                <1> 	mov	al, ch ; <- hours BCD
  1946 0000A8E4 240F                <1> 	and	al, 0Fh
  1947 0000A8E6 88EC                <1> 	mov	ah, ch
  1948 0000A8E8 C0EC04              <1> 	shr	ah, 4
  1949 0000A8EB D50A                <1> 	aad
  1950 0000A8ED 88C5                <1> 	mov	ch, al ; -> hours
  1951                              <1> 
  1952 0000A8EF 88C8                <1> 	mov	al, cl ; <- minutes BCD
  1953 0000A8F1 240F                <1> 	and	al, 0Fh
  1954 0000A8F3 88CC                <1> 	mov	ah, cl
  1955 0000A8F5 C0EC04              <1> 	shr	ah, 4
  1956 0000A8F8 D50A                <1> 	aad
  1957 0000A8FA 88C1                <1> 	mov	cl, al ; -> minutes
  1958                              <1> 
  1959 0000A8FC 88F0                <1> 	mov	al, dh ; <- seconds BCD
  1960 0000A8FE 240F                <1> 	and	al, 0Fh
  1961 0000A900 88F4                <1> 	mov	ah, dh
  1962 0000A902 C0EC04              <1> 	shr	ah, 4
  1963 0000A905 D50A                <1> 	aad
  1964 0000A907 88C6                <1> 	mov	dh, al ; -> seconds
  1965                              <1> 
  1966 0000A909 88E8                <1> 	mov	al, ch ; hours
  1967 0000A90B 66C1E006            <1> 	shl	ax, 6
  1968 0000A90F 08C8                <1> 	or	al, cl ; minutes
  1969 0000A911 66C1E005            <1> 	shl	ax, 5
  1970 0000A915 D0EE                <1> 	shr	dh, 1 ; 2 seconds
  1971                              <1> 	; There is a bug in TRDOS v1 here !
  1972                              <1> 	; it was 'or al, dl' ! 
  1973 0000A917 08F0                <1> 	or	al, dh ; seconds
  1974                              <1> 
  1975 0000A919 665A                <1> 	pop	dx ; pop date
  1976                              <1> 	
  1977 0000A91B C3                  <1> 	retn
  1978                              <1> 
  1979                              <1> save_directory_buffer:
  1980                              <1> 	; 15/10/2016
  1981                              <1> 	; 23/03/2016
  1982                              <1> 	; 26/02/2016
  1983                              <1> 	; 22/02/2016 (TRDOS 386 = TRDOS v2.0)
  1984                              <1> 	; 01/08/2011
  1985                              <1> 	; 14/03/2010
  1986                              <1> 	; INPUT ->
  1987                              <1> 	; 	 none
  1988                              <1> 	; OUTPUT ->
  1989                              <1> 	;  cf = 0 -> write OK...
  1990                              <1> 	;  cf = 1 -> error code in AL (EAX)
  1991                              <1> 	;  cf = 1 & AL = 0Dh => CH & CL = FS & FAT type
  1992                              <1> 	;  EBX = Directory Buffer Address
  1993                              <1> 	;
  1994                              <1> 	;  (EAX, ECX, EDX will be modified)
  1995                              <1>  
  1996 0000A91C BB00000800          <1> 	mov	ebx, Directory_Buffer
  1997 0000A921 803D[AC600100]02    <1> 	cmp	byte [DirBuff_ValidData], 2
  1998 0000A928 7403                <1> 	je	short loc_save_dir_buffer
  1999 0000A92A 31C0                <1> 	xor	eax, eax
  2000 0000A92C C3                  <1> 	retn            
  2001                              <1> 
  2002                              <1> loc_save_dir_buffer:
  2003 0000A92D 56                  <1> 	push	esi
  2004 0000A92E 31DB                <1> 	xor	ebx, ebx 
  2005 0000A930 8A3D[AA600100]      <1>         mov     bh, [DirBuff_DRV]
  2006 0000A936 80EF41              <1> 	sub	bh, 'A'
  2007 0000A939 BE00010900          <1>         mov     esi, Logical_DOSDisks
  2008 0000A93E 01DE                <1> 	add	esi, ebx
  2009 0000A940 668B4E03            <1>         mov     cx, [esi+LD_FATType]
  2010                              <1> 	; CH = FS Type (A1h for FS)
  2011                              <1> 	; CL = FAT Type (0 for FS)
  2012 0000A944 08C9                <1> 	or	cl, cl
  2013 0000A946 7433                <1> 	jz	short loc_save_dir_buff_stc_retn
  2014                              <1> 
  2015                              <1> loc_save_dir_buffer_check_cluster_no:    
  2016 0000A948 A1[B1600100]        <1> 	mov	eax, [DirBuff_Cluster]
  2017 0000A94D 28FF                <1> 	sub	bh, bh ; ebx = 0
  2018 0000A94F 09C0                <1> 	or	eax, eax
  2019 0000A951 7540                <1> 	jnz	short loc_save_sub_dir_buffer
  2020 0000A953 8A25[AB600100]      <1> 	mov	ah, [DirBuff_FATType]
  2021 0000A959 FEC3                <1> 	inc	bl ;  bl = 1
  2022 0000A95B 38DC                <1> 	cmp	ah, bl
  2023 0000A95D 721D                <1> 	jb	short loc_save_dir_buff_inv_data_retn
  2024 0000A95F FEC3                <1> 	inc	bl ; bl = 2
  2025 0000A961 38E3                <1> 	cmp	bl, ah
  2026 0000A963 7217                <1> 	jb	short loc_save_dir_buff_inv_data_retn
  2027                              <1> 
  2028                              <1> loc_save_root_dir_buffer:
  2029 0000A965 668B5E17            <1> 	mov	bx, [esi+LD_BPB+RootDirEnts]
  2030 0000A969 6683C30F            <1> 	add	bx, 15
  2031 0000A96D 66C1EB04            <1> 	shr	bx, 4 ; 16 dir entries per sector
  2032 0000A971 6609DB              <1> 	or	bx, bx
  2033 0000A974 7405                <1> 	jz	short loc_save_dir_buff_stc_retn
  2034                              <1> 	;mov	ecx, ebx 
  2035 0000A976 8B4664              <1> 	mov	eax, [esi+LD_ROOTBegin] ; 26/02/2016
  2036 0000A979 EB23                <1> 	jmp	short loc_write_directory_to_disk
  2037                              <1> 
  2038                              <1> loc_save_dir_buff_stc_retn:
  2039 0000A97B F9                  <1> 	stc
  2040                              <1> loc_save_dir_buff_inv_data_retn:
  2041                              <1> 	; 15/10/2016 (0Dh -> 29)
  2042 0000A97C B01D                <1> 	mov	al, 29 ; Invalid data !
  2043 0000A97E C605[AC600100]00    <1> 	mov	byte [DirBuff_ValidData], 0
  2044 0000A985 EB05                <1> 	jmp	short loc_save_dir_buff_retn 
  2045                              <1> 
  2046                              <1> loc_write_directory_to_disk_err:
  2047                              <1> 	; 15/10/2016 (disk write error code, 1Dh -> 18)
  2048 0000A987 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error 
  2049                              <1> 
  2050                              <1> loc_save_dir_buff_retn:
  2051 0000A98C BB00000800          <1> 	mov	ebx, Directory_Buffer
  2052 0000A991 5E                  <1> 	pop	esi
  2053 0000A992 C3                  <1> 	retn
  2054                              <1>  
  2055                              <1> loc_save_sub_dir_buffer:
  2056                              <1> 	; ebx  = 0
  2057 0000A993 83E802              <1> 	sub	eax, 2
  2058 0000A996 8A5E13              <1> 	mov	bl, [esi+LD_BPB+SecPerClust]
  2059 0000A999 F7E3                <1> 	mul	ebx
  2060 0000A99B 034668              <1>         add     eax, [esi+LD_DATABegin]
  2061                              <1>  	;mov	ecx, ebx
  2062                              <1> 
  2063                              <1> loc_write_directory_to_disk:
  2064 0000A99E 89D9                <1>  	mov	ecx, ebx
  2065 0000A9A0 BB00000800          <1> 	mov	ebx, Directory_Buffer
  2066 0000A9A5 E8A34E0000          <1> 	call	disk_write
  2067 0000A9AA 72DB                <1> 	jc	short loc_write_directory_to_disk_err
  2068                              <1> 
  2069                              <1> loc_save_dir_buff_validate_retn:
  2070 0000A9AC C605[AC600100]01    <1> 	mov	byte [DirBuff_ValidData], 1
  2071 0000A9B3 31C0                <1> 	xor	eax, eax
  2072                              <1> 	; 26/02/2016
  2073 0000A9B5 EBD5                <1> 	jmp	short loc_save_dir_buff_retn
  2074                              <1> 
  2075                              <1> update_parent_dir_lmdt:
  2076                              <1> 	; 29/12/2017
  2077                              <1> 	; 22/02/2016 (TRDOS 386 = TRDOS v2.0)
  2078                              <1> 	; 01/08/2011
  2079                              <1> 	; 16/10/2010 
  2080                              <1> 	; 
  2081                              <1> 	; INPUT -> 
  2082                              <1> 	;	none
  2083                              <1>  	; OUTPUT ->
  2084                              <1> 	;	(last modification date & time of the parent dir
  2085                              <1> 	;	will be changed/updated)
  2086                              <1> 	;
  2087                              <1> 	; (EAX, EBX, ECX, EDX, EDI will be changed)
  2088                              <1> 
  2089 0000A9B7 29C0                <1> 	sub	eax, eax
  2090 0000A9B9 8A25[84590100]      <1> 	mov	ah, [Current_Dir_Level]
  2091 0000A9BF A0[85590100]        <1> 	mov	al, [Current_FATType]
  2092 0000A9C4 3C01                <1> 	cmp	al, 1
  2093 0000A9C6 723A                <1> 	jb	short loc_UPDLMDT_proc_retn
  2094                              <1>     
  2095                              <1> loc_update_parent_dir_lm_date_time:
  2096 0000A9C8 08E4                <1> 	or	ah, ah
  2097 0000A9CA 7436                <1> 	jz	short loc_UPDLMDT_proc_retn
  2098                              <1> 
  2099 0000A9CC 56                  <1> 	push	esi ; *
  2100 0000A9CD 8825[24630100]      <1> 	mov	[UPDLMDT_CDirLevel], ah
  2101 0000A9D3 8B15[80590100]      <1> 	mov	edx, [Current_Dir_FCluster]
  2102 0000A9D9 8915[25630100]      <1> 	mov	[UPDLMDT_CDirFCluster], edx
  2103                              <1> 
  2104 0000A9DF FECC                <1> 	dec	ah
  2105 0000A9E1 B90C000000          <1> 	mov	ecx, 12
  2106 0000A9E6 BE[E3600100]        <1>         mov     esi, PATH_Array
  2107                              <1> 
  2108 0000A9EB 8825[84590100]      <1> 	mov	[Current_Dir_Level], ah
  2109 0000A9F1 08E4                <1> 	or	ah, ah
  2110 0000A9F3 750E                <1> 	jnz	short loc_update_parent_dir_lmdt_load_sub_dir_1
  2111 0000A9F5 803D[85590100]02    <1> 	cmp	byte [Current_FATType], 2
  2112 0000A9FC 770B                <1> 	ja	short loc_update_parent_dir_lmdt_load_sub_dir_2
  2113 0000A9FE 28C0                <1> 	sub	al, al ; eax = 0
  2114 0000AA00 EB0A                <1> 	jmp	short loc_update_parent_dir_lmdt_load_sub_dir_3
  2115                              <1> 
  2116                              <1> loc_UPDLMDT_proc_retn:
  2117 0000AA02 C3                  <1> 	retn
  2118                              <1>          
  2119                              <1> loc_update_parent_dir_lmdt_load_sub_dir_1:
  2120 0000AA03 B010                <1> 	mov	al, 16
  2121 0000AA05 F6E4                <1> 	mul	ah 
  2122 0000AA07 01C6                <1> 	add	esi, eax
  2123                              <1> 
  2124                              <1> loc_update_parent_dir_lmdt_load_sub_dir_2:  
  2125 0000AA09 8B460C              <1> 	mov	eax, [esi+12] ; Parent Dir First Cluster
  2126                              <1> 
  2127                              <1> loc_update_parent_dir_lmdt_load_sub_dir_3:
  2128 0000AA0C A3[80590100]        <1> 	mov	[Current_Dir_FCluster], eax
  2129                              <1> 
  2130 0000AA11 83C610              <1> 	add	esi, 16
  2131 0000AA14 66BF[0A62]          <1> 	mov	di, Dir_File_Name  
  2132 0000AA18 F3A4                <1> 	rep	movsb
  2133                              <1> 	
  2134 0000AA1A BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2135 0000AA1F 29DB                <1> 	sub	ebx, ebx
  2136 0000AA21 8A3D[86590100]      <1> 	mov	bh, [Current_Drv]
  2137 0000AA27 01DE                <1> 	add	esi, ebx
  2138 0000AA29 E88FF7FFFF          <1> 	call	reload_current_directory
  2139 0000AA2E 7230                <1> 	jc	short loc_update_parent_dir_lmdt_restore_cdirlevel
  2140                              <1> 
  2141                              <1> loc_update_parent_dir_lmdt_locate_dir: 
  2142 0000AA30 BE[0A620100]        <1> 	mov	esi, Dir_File_Name        
  2143 0000AA35 6631C9              <1> 	xor	cx, cx
  2144 0000AA38 66B81008            <1> 	mov	ax, 0810h ; Only directories
  2145 0000AA3C E8B5F6FFFF          <1>         call    locate_current_dir_file
  2146                              <1> 	; EDI = DirBuff Directory Entry Address
  2147 0000AA41 721D                <1> 	jc	short loc_update_parent_dir_lmdt_restore_cdirlevel
  2148                              <1> 
  2149 0000AA43 E836FEFFFF          <1> 	call	convert_current_date_time
  2150 0000AA48 66895712            <1> 	mov	[edi+18], dx ; Last Access Date
  2151 0000AA4C 66895718            <1> 	mov	[edi+24], dx ; Last Write Date
  2152 0000AA50 66894716            <1> 	mov	[edi+22], ax ; Last Write Time
  2153                              <1> 
  2154 0000AA54 C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  2155 0000AA5B E8BCFEFFFF          <1> 	call	save_directory_buffer
  2156                              <1> 	; 29/12/2017
  2157                              <1> 	;jc	short loc_update_parent_dir_lmdt_restore_cdirlevel
  2158                              <1> 	;xor	al, al 
  2159                              <1> loc_update_parent_dir_lmdt_restore_cdirlevel:
  2160                              <1>  	;current directory level restoration
  2161 0000AA60 8A25[24630100]      <1> 	mov	ah, [UPDLMDT_CDirLevel]
  2162 0000AA66 8825[84590100]      <1> 	mov	[Current_Dir_Level], ah
  2163 0000AA6C 8B15[25630100]      <1>         mov     edx, [UPDLMDT_CDirFCluster]
  2164 0000AA72 8915[80590100]      <1> 	mov	[Current_Dir_FCluster], edx
  2165                              <1> 
  2166 0000AA78 5E                  <1> 	pop	esi ; *
  2167 0000AA79 C3                  <1> 	retn
  2168                              <1> 
  2169                              <1> delete_longname:
  2170                              <1> 	; 27/02/2016 (TRDOS 386 = TRDOS v2.0)
  2171                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_delete_longname')
  2172                              <1> 	; 14/03/2010
  2173                              <1> 	; INPUT ->
  2174                              <1> 	; 	EAX = Directory Entry (Index) Number (< 65536)
  2175                              <1> 	; OUTPUT ->
  2176                              <1> 	;	cf = 0 -> OK  (EAX = 0)
  2177                              <1> 	; 	cf = 1 -> error code in EAX (AL)
  2178                              <1> 	;
  2179                              <1> 	; (Modified registers: EAX, EDX, ECX, EBX, EDI) 
  2180                              <1> 
  2181 0000AA7A 66A3[54630100]      <1> 	mov	[DLN_EntryNumber], ax
  2182 0000AA80 C605[56630100]40    <1>         mov     byte [DLN_40h], 40h
  2183                              <1> 
  2184 0000AA87 E858000000          <1> 	call	locate_current_dir_entry
  2185 0000AA8C 7308                <1> 	jnc	short loc_dln_check_attributes
  2186 0000AA8E C3                  <1> 	retn
  2187                              <1> 
  2188                              <1> loc_dln_longname_not_found:
  2189 0000AA8F B802000000          <1> 	mov	eax, 2
  2190 0000AA94 F9                  <1> 	stc
  2191 0000AA95 C3                  <1> 	retn
  2192                              <1> 
  2193                              <1> loc_dln_check_attributes:
  2194 0000AA96 B00F                <1> 	mov	al, 0Fh  ; long name
  2195 0000AA98 8A670B              <1> 	mov	ah, [edi+0Bh] ; dir entry attributes
  2196 0000AA9B 38C4                <1> 	cmp	ah, al
  2197 0000AA9D 75F0                <1> 	jne	short loc_dln_longname_not_found
  2198 0000AA9F 8A27                <1> 	mov	ah, [edi]
  2199 0000AAA1 2A25[56630100]      <1> 	sub	ah, [DLN_40h]
  2200 0000AAA7 76E6                <1> 	jna	short loc_dln_longname_not_found         
  2201 0000AAA9 80FC14              <1> 	cmp	ah, 14h ; 84-64=20 -> 20*13=260 bytes
  2202 0000AAAC 77E1                <1> 	ja	short loc_dln_longname_not_found
  2203                              <1>              
  2204 0000AAAE C607E5              <1> 	mov	byte [edi], 0E5h  ; deleted sign
  2205 0000AAB1 C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2 ; changed/write sign
  2206 0000AAB8 C605[56630100]00    <1> 	mov	byte [DLN_40h], 0 ; 40h -> 0
  2207                              <1> 	  
  2208                              <1> loc_dln_delete_next_ln_entry:
  2209 0000AABF 80FC01              <1> 	cmp	ah, 1
  2210 0000AAC2 7616                <1> 	jna	short loc_dln_longname_retn
  2211                              <1> loc_dln_delete_next_ln_entry_0:
  2212 0000AAC4 66FF05[54630100]    <1> 	inc	word [DLN_EntryNumber]
  2213 0000AACB 0FB705[54630100]    <1> 	movzx	eax, word [DLN_EntryNumber] 
  2214 0000AAD2 E80D000000          <1> 	call	locate_current_dir_entry
  2215 0000AAD7 73BD                <1> 	jnc	short loc_dln_check_attributes
  2216                              <1> 
  2217                              <1> loc_dln_longname_stc_retn:
  2218 0000AAD9 C3                  <1> 	retn 
  2219                              <1> 	   
  2220                              <1> loc_dln_longname_retn:
  2221                              <1> 	;cmp	byte [DirBuff_ValidData], 2
  2222                              <1> 	;jne	short loc_dln_longname_retn_xor_eax
  2223 0000AADA E83DFEFFFF          <1> 	call	save_directory_buffer
  2224 0000AADF 72F8                <1> 	jc	short loc_dln_longname_stc_retn
  2225                              <1> 
  2226                              <1> loc_dln_longname_retn_xor_eax:
  2227 0000AAE1 31C0                <1> 	xor	eax, eax
  2228 0000AAE3 C3                  <1> 	retn
  2229                              <1> 
  2230                              <1> locate_current_dir_entry:
  2231                              <1> 	; 16/10/2016
  2232                              <1> 	; 15/10/2016
  2233                              <1> 	; 23/03/2016
  2234                              <1> 	; 27/02/2016 (TRDOS 386 = TRDOS v2.0)
  2235                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_locate_current_dir_entry')
  2236                              <1> 	; 07/03/2010
  2237                              <1> 	; INPUT ->
  2238                              <1> 	;	EAX = Directory Entry (Index) Number (< 65536) 
  2239                              <1> 	; OUTPUT ->
  2240                              <1> 	;	EDI = Directory Entry Address
  2241                              <1> 	; 	EAX = Cluster Number of Directory Buffer
  2242                              <1> 	;	EBX = Directory Buffer Entry Offset
  2243                              <1> 	;	ECX = DirBuff Valid Data identifier (CL)
  2244                              <1> 	;   	If CF = 0 and CL = 2 then
  2245                              <1> 	;	   directory buffer modified and
  2246                              <1> 	;	   must be written to disk.
  2247                              <1> 	; 	If CF = 0  and CL = 1 then
  2248                              <1> 	;	   dir buffer has been written to disk, already.
  2249                              <1> 	;	CF = 1 -> Error code in EAX (AL)
  2250                              <1> 	;
  2251                              <1> 	; (Modified registers: EAX, EDX, ECX, EBX, EDI) 
  2252                              <1> 
  2253                              <1> loc_locate_current_dir_entry:
  2254 0000AAE4 56                  <1> 	push	esi
  2255 0000AAE5 89C1                <1> 	mov	ecx, eax
  2256 0000AAE7 BA20000000          <1> 	mov	edx, 32
  2257 0000AAEC F7E2                <1> 	mul	edx 
  2258 0000AAEE A3[60630100]        <1> 	mov	[LCDE_ByteOffset], eax
  2259 0000AAF3 31DB                <1> 	xor	ebx, ebx
  2260 0000AAF5 8A3D[86590100]      <1> 	mov	bh, [Current_Drv]
  2261 0000AAFB A0[AA600100]        <1>         mov     al, [DirBuff_DRV]
  2262 0000AB00 2C41                <1> 	sub	al, 'A'
  2263 0000AB02 BE00010900          <1>         mov     esi, Logical_DOSDisks
  2264 0000AB07 01DE                <1> 	add	esi, ebx
  2265 0000AB09 38C7                <1> 	cmp	bh, al
  2266 0000AB0B 0F8592000000        <1>         jne     loc_lcde_reload_current_directory
  2267                              <1> loc_lcde_cdl_check:
  2268 0000AB11 803D[84590100]00    <1> 	cmp	byte [Current_Dir_Level], 0
  2269 0000AB18 772A                <1> 	ja	short loc_lcde_calc_dirbuff_cluster_offset
  2270                              <1> 	; 27/02/2016
  2271                              <1> 	; TRDOS v1 has bug here for FAT32 fs !
  2272                              <1> 	; (Root Directory Entries for FAT32 = 0)
  2273 0000AB1A 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3  ; FAT32
  2274 0000AB1E 7324                <1> 	jnb	short loc_lcde_calc_dirbuff_cluster_offset
  2275                              <1> 
  2276                              <1> loc_lcde_cdl_check_FAT12_16:
  2277 0000AB20 668B4617            <1> 	mov	ax, [esi+LD_BPB+RootDirEnts]
  2278 0000AB24 6648                <1> 	dec	ax
  2279                              <1> 	;xor	dx, dx  
  2280 0000AB26 6639C8              <1> 	cmp	ax, cx ; cx = Directory Entry (Index) Number
  2281 0000AB29 720E                <1> 	jb	short loc_lcde_stc_12h_retn
  2282 0000AB2B 66890D[58630100]    <1> 	mov	[LCDE_EntryIndex], cx
  2283 0000AB32 31C0                <1> 	xor	eax, eax
  2284 0000AB34 E993000000          <1>         jmp     loc_lcde_check_dir_buffer_cluster
  2285                              <1> 
  2286                              <1> loc_lcde_stc_12h_retn:
  2287 0000AB39 5E                  <1> 	pop	esi
  2288 0000AB3A 89CB                <1> 	mov	ebx, ecx
  2289 0000AB3C 89D1                <1> 	mov	ecx, edx
  2290                              <1> 	; 16/10/2016 (12h -> 12)
  2291 0000AB3E B80C000000          <1> 	mov	eax, 12 ; No more files
  2292 0000AB43 C3                  <1> 	retn 
  2293                              <1> 
  2294                              <1> loc_lcde_calc_dirbuff_cluster_offset:
  2295 0000AB44 8A5E13              <1> 	mov	bl, [esi+LD_BPB+SecPerClust]
  2296 0000AB47 30FF                <1> 	xor	bh, bh
  2297 0000AB49 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec]
  2298 0000AB4D 66F7E3              <1> 	mul	bx
  2299 0000AB50 6609D2              <1>  	or	dx, dx ; If bytes per cluster > 32KB it is invalid
  2300 0000AB53 755D                <1> 	jnz	short loc_lcde_invalid_format
  2301                              <1> 	;mov	ecx, eax
  2302 0000AB55 6689C1              <1> 	mov	cx, ax ; BYTES PER CLUSTER
  2303 0000AB58 A1[60630100]        <1> 	mov	eax, [LCDE_ByteOffset]
  2304                              <1> 	;sub	edx, edx
  2305 0000AB5D F7F1                <1> 	div	ecx
  2306 0000AB5F 3DFFFF0000          <1> 	cmp	eax, 65535
  2307 0000AB64 774C                <1> 	ja	short loc_lcde_invalid_format
  2308                              <1> 
  2309                              <1> 	; cluster sequence number of directory (< 65536)
  2310 0000AB66 66A3[5A630100]      <1> 	mov	[LCDE_ClusterSN], ax 
  2311                              <1> 
  2312 0000AB6C 6689D0              <1> 	mov	ax, dx ; byte offset in cluster (directory buffer)
  2313 0000AB6F 66BB2000            <1> 	mov	bx, 32 ; ; 1 dir entry = 32 bytes
  2314 0000AB73 6629D2              <1>         sub     dx, dx  ; 0
  2315 0000AB76 66F7F3              <1> 	div	bx 
  2316 0000AB79 66A3[58630100]      <1> 	mov	[LCDE_EntryIndex], ax ; dir entry index/sequence number
  2317                              <1> 				      ; (in directory buffer/cluster)	  
  2318                              <1> loc_lcde_get_current_sub_dir_fcluster:
  2319 0000AB7F A1[80590100]        <1> 	mov	eax, [Current_Dir_FCluster]
  2320                              <1> 
  2321                              <1> loc_lcde_get_next_cluster:
  2322 0000AB84 66833D[5A630100]00  <1> 	cmp	word [LCDE_ClusterSN], 0
  2323 0000AB8C 763E                <1> 	jna	short loc_lcde_check_dir_buffer_cluster
  2324 0000AB8E A3[5C630100]        <1> 	mov	[LCDE_Cluster], eax
  2325 0000AB93 E834100000          <1> 	call	get_next_cluster
  2326 0000AB98 7220                <1> 	jc	short loc_lcde_check_gnc_error
  2327 0000AB9A 66FF0D[5A630100]    <1>   	dec	word [LCDE_ClusterSN]
  2328 0000ABA1 EBE1                <1> 	jmp	short loc_lcde_get_next_cluster
  2329                              <1> 
  2330                              <1> loc_lcde_reload_current_directory:
  2331 0000ABA3 51                  <1> 	push	ecx
  2332 0000ABA4 E814F6FFFF          <1> 	call	reload_current_directory
  2333 0000ABA9 59                  <1> 	pop	ecx
  2334 0000ABAA 0F8361FFFFFF        <1>         jnc     loc_lcde_cdl_check
  2335 0000ABB0 5E                  <1> 	pop	esi
  2336 0000ABB1 C3                  <1> 	retn
  2337                              <1> 
  2338                              <1> loc_lcde_invalid_format:
  2339                              <1> 	; 15/10/2016 (0Bh -> 28)
  2340 0000ABB2 B81C000000          <1> 	mov	eax, 28 ; Invalid Format !
  2341                              <1> loc_lcde_drive_not_ready_read_err:
  2342 0000ABB7 F9                  <1> 	stc
  2343 0000ABB8 5E                  <1> 	pop	esi 
  2344 0000ABB9 C3                  <1> 	retn  
  2345                              <1> 
  2346                              <1> loc_lcde_check_gnc_error:
  2347 0000ABBA 09C0                <1> 	or	eax, eax
  2348 0000ABBC 75F9                <1> 	jnz	short loc_lcde_drive_not_ready_read_err
  2349 0000ABBE 66FF0D[5A630100]    <1> 	dec	word [LCDE_ClusterSN]
  2350 0000ABC5 75EB                <1> 	jnz	short loc_lcde_invalid_format 
  2351 0000ABC7 A1[5C630100]        <1> 	mov	eax, [LCDE_Cluster]
  2352                              <1> 
  2353                              <1> loc_lcde_check_dir_buffer_cluster:
  2354 0000ABCC 3B05[B1600100]      <1> 	cmp	eax, [DirBuff_Cluster]
  2355 0000ABD2 755C                <1> 	jne	short loc_lcde_load_dir_cluster
  2356 0000ABD4 803D[AC600100]00    <1> 	cmp	byte [DirBuff_ValidData], 0
  2357 0000ABDB 7727                <1> 	ja	short lcde_check_dir_buffer_cluster_next
  2358 0000ABDD 803D[84590100]00    <1> 	cmp	byte [Current_Dir_Level], 0    
  2359 0000ABE4 775F                <1> 	ja	short loc_lcde_load_dir_cluster_0
  2360                              <1> 	; 27/02/2016
  2361                              <1> 	; TRDOS v1 has bug here for FAT32 fs !
  2362 0000ABE6 807E0303            <1> 	cmp	byte [esi+LD_FATType], 3  ; FAT32
  2363 0000ABEA 7359                <1> 	jnb	short loc_lcde_load_dir_cluster_0
  2364                              <1> 	;
  2365 0000ABEC 0FB74E17            <1> 	movzx	ecx, word [esi+LD_BPB+RootDirEnts]
  2366 0000ABF0 6683C10F            <1> 	add	cx, 15 ; round up (16 entries per sector)
  2367 0000ABF4 66C1E904            <1> 	shr	cx, 4 ; 1 sector contains 16 dir entries	
  2368                              <1> 
  2369 0000ABF8 8B4664              <1>         mov     eax, [esi+LD_ROOTBegin]
  2370 0000ABFB EB54                <1> 	jmp	short loc_lcde_load_dir_cluster_1 
  2371                              <1> 
  2372                              <1> loc_lcde_validate_dirBuff:
  2373 0000ABFD C605[AC600100]01    <1> 	mov	byte [DirBuff_ValidData], 1
  2374                              <1> 
  2375                              <1> lcde_check_dir_buffer_cluster_next:
  2376 0000AC04 0FB71D[58630100]    <1> 	movzx	ebx, word [LCDE_EntryIndex]
  2377 0000AC0B 663B1D[AF600100]    <1> 	cmp	bx, [DirBuff_LastEntry]
  2378 0000AC12 779E                <1> 	ja	short loc_lcde_invalid_format 
  2379 0000AC14 B820000000          <1> 	mov	eax, 32
  2380 0000AC19 F7E3                <1> 	mul	ebx
  2381                              <1> 	;or	edx, edx
  2382                              <1> 	;jnz	short loc_lcde_invalid_format
  2383                              <1> 
  2384 0000AC1B BF00000800          <1> 	mov	edi, Directory_Buffer  
  2385 0000AC20 01C7                <1> 	add	edi, eax ; add entry offset to buffer address
  2386                              <1> 
  2387                              <1> loc_lcde_dir_buffer_last_check:
  2388 0000AC22 A1[B1600100]        <1> 	mov	eax, [DirBuff_Cluster]
  2389 0000AC27 0FB60D[AC600100]    <1> 	movzx	ecx, byte [DirBuff_ValidData]
  2390                              <1> 
  2391                              <1> loc_lcde_retn:
  2392 0000AC2E 5E                  <1> 	pop	esi
  2393 0000AC2F C3                  <1> 	retn
  2394                              <1> 
  2395                              <1> loc_lcde_load_dir_cluster:
  2396                              <1> 	;cmp	byte [DirBuff_ValidData], 2
  2397                              <1> 	;jne	short loc_lcde_load_dir_cluster_n2
  2398 0000AC30 50                  <1> 	push	eax
  2399 0000AC31 E8E6FCFFFF          <1> 	call	save_directory_buffer
  2400 0000AC36 58                  <1> 	pop	eax
  2401 0000AC37 72F5                <1> 	jc	short loc_lcde_retn
  2402                              <1> 
  2403                              <1> loc_lcde_load_dir_cluster_n2:
  2404 0000AC39 C605[AC600100]00    <1> 	mov	byte [DirBuff_ValidData], 0
  2405 0000AC40 A3[B1600100]        <1> 	mov	[DirBuff_Cluster], eax
  2406                              <1> 
  2407                              <1> loc_lcde_load_dir_cluster_0:
  2408 0000AC45 83E802              <1> 	sub	eax, 2
  2409 0000AC48 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  2410 0000AC4C F7E1                <1> 	mul	ecx
  2411 0000AC4E 034668              <1>         add     eax, [esi+LD_DATABegin]
  2412                              <1> 
  2413                              <1> loc_lcde_load_dir_cluster_1:
  2414 0000AC51 BB00000800          <1> 	mov	ebx, Directory_Buffer
  2415                              <1> 	; ecx = sector count
  2416 0000AC56 E8014C0000          <1> 	call	disk_read
  2417 0000AC5B 73A0                <1> 	jnc	short loc_lcde_validate_dirBuff
  2418                              <1> 
  2419                              <1> 	; 15/10/2016 
  2420                              <1> 	; (Disk read error instead of drv not ready err)
  2421 0000AC5D B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error !
  2422 0000AC62 EBCA                <1> 	jmp	short loc_lcde_retn
  2423                              <1> 
  2424                              <1> 
  2425                              <1> remove_file:
  2426                              <1> 	; 15/10/2016
  2427                              <1> 	; 28/02/2016 (TRDOS 386 = TRDOS v2.0)
  2428                              <1> 	; 10/04/2011 (FILE.ASM, 'proc_delete_file')
  2429                              <1> 	; 09/08/2010
  2430                              <1> 	; INPUT ->
  2431                              <1> 	;	EDI = Directory Buffer Entry Address
  2432                              <1> 	;	 CX = Directory Buffer Entry Counter/Index
  2433                              <1> 	;	 BL = Longname Entry Length
  2434                              <1> 	;	 BH = Logical DOS Drive Number 
  2435                              <1> 
  2436 0000AC64 29C0                <1> 	sub	eax, eax
  2437 0000AC66 88FC                <1> 	mov	ah, bh
  2438 0000AC68 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  2439 0000AC6D 01C6                <1> 	add	esi, eax
  2440                              <1> 
  2441 0000AC6F 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  2442 0000AC73 7312                <1> 	jnb	short loc_del_fat_file 
  2443                              <1>               
  2444 0000AC75 807E04A1            <1> 	cmp	byte [esi+LD_FSType], 0A1h
  2445 0000AC79 7406                <1> 	je	short loc_del_fs_file
  2446                              <1> 
  2447                              <1> loc_del_file_invalid_format:
  2448 0000AC7B 30E4                <1> 	xor	ah, ah
  2449                              <1> 	; 15/10/2016 (0Bh -> 28)
  2450 0000AC7D B01C                <1> 	mov	al, 28  ; Invalid Format
  2451 0000AC7F F9                  <1> 	stc 
  2452 0000AC80 C3                  <1> 	retn
  2453                              <1> 
  2454                              <1> loc_del_fs_file:
  2455 0000AC81 E83F0F0000          <1> 	call	delete_fs_file
  2456 0000AC86 C3                  <1> 	retn
  2457                              <1> 
  2458                              <1> loc_del_fat_file:
  2459 0000AC87 E808000000          <1> 	call	delete_directory_entry
  2460 0000AC8C 7205                <1> 	jc	short loc_del_file_err_retn 
  2461                              <1> 
  2462                              <1> loc_delfile_unlink_cluster_chain:
  2463 0000AC8E E863170000          <1> 	call	truncate_cluster_chain
  2464                              <1> 	;jc	short loc_del_file_err_retn
  2465                              <1> 
  2466                              <1> loc_delfile_return:
  2467                              <1> loc_del_file_err_retn:
  2468 0000AC93 C3                  <1> 	retn
  2469                              <1> 
  2470                              <1> delete_directory_entry:
  2471                              <1> 	; 15/10/2016
  2472                              <1> 	; 28/02/2016 (TRDOS 386 = TRDOS v2.0)
  2473                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_delete_directory_entry')
  2474                              <1> 	; 10/04/2011 
  2475                              <1> 	; INPUT ->
  2476                              <1> 	; 	ESI = Logical Dos Drive Descripton Table Address 
  2477                              <1> 	;	EDI = Directory Buffer Entry Address
  2478                              <1> 	;	 CX = Directory Buffer Entry Counter/Index
  2479                              <1> 	;	 BL = Longname Entry Length
  2480                              <1> 	; OUTPUT ->
  2481                              <1> 	; 	ESI = Logical dos drive descripton table address 
  2482                              <1> 	;	EAX = First cluster to be truncated/unlinked
  2483                              <1> 	;       CF = 1 -> Error code in EAX (AL)
  2484                              <1> 	;       CF = 0 & BH <> 0 -> LMDT write error  (BH = 1)
  2485                              <1> 	;       CF = 0 & BL <> 0 -> Long name delete error (BL = FFh) 
  2486                              <1> 	;
  2487                              <1> 	;  (EDI, EBX, ECX register contents will be changed)
  2488                              <1> 
  2489 0000AC94 881D[EE620100]      <1> 	mov	[DelFile_LNEL], bl
  2490 0000AC9A 66890D[EC620100]    <1> 	mov	[DelFile_EntryCounter], cx
  2491                              <1> 
  2492 0000ACA1 668B4714            <1> 	mov	ax, [edi+20] ; First Cluster High Word
  2493 0000ACA5 C1E010              <1> 	shl	eax, 16
  2494 0000ACA8 668B471A            <1> 	mov	ax, [edi+26] ; First Cluster Low Word
  2495                              <1> 
  2496 0000ACAC A3[E8620100]        <1> 	mov	[DelFile_FCluster], eax
  2497                              <1> 
  2498                              <1> loc_del_short_name:
  2499 0000ACB1 C607E5              <1> 	mov	byte [edi], 0E5h  ; Deleted sign
  2500                              <1> 
  2501 0000ACB4 C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  2502 0000ACBB E85CFCFFFF          <1> 	call	save_directory_buffer
  2503 0000ACC0 723D                <1> 	jc	short loc_delete_direntry_err_return
  2504                              <1>  
  2505                              <1> loc_del_long_name:
  2506 0000ACC2 0FB615[EE620100]    <1> 	movzx	edx, byte [DelFile_LNEL]
  2507 0000ACC9 08D2                <1> 	or	dl, dl
  2508 0000ACCB 7416                <1> 	jz	short loc_del_dir_entry_update_parent_dir_lm_date
  2509                              <1> 
  2510 0000ACCD 8835[EE620100]      <1> 	mov	byte [DelFile_LNEL], dh ; 0              
  2511                              <1>   
  2512 0000ACD3 0FB705[EC620100]    <1> 	movzx	eax,  word [DelFile_EntryCounter]
  2513 0000ACDA 29D0                <1> 	sub	eax, edx
  2514                              <1> 	;jnc	short loc_del_long_name_continue
  2515 0000ACDC 7205                <1> 	jc	short loc_del_dir_entry_update_parent_dir_lm_date   
  2516                              <1> 
  2517                              <1> ;loc_del_direntry_inv_data_return: ; 15/10/2016 (0Dh -> 29)
  2518                              <1> ;	mov	eax, 29 ; 0Dh (TRDOS 8086) ; Invalid data
  2519                              <1> ;	retn
  2520                              <1> 
  2521                              <1> loc_del_long_name_continue: 
  2522                              <1> 	; AX = Directory Entry Number of the long name last entry
  2523 0000ACDE E897FDFFFF          <1> 	call	delete_longname
  2524                              <1> 	;jc	short loc_delete_direntry_err_return
  2525                              <1> 
  2526                              <1> loc_del_dir_entry_update_parent_dir_lm_date:
  2527 0000ACE3 801D[EE620100]00    <1> 	sbb	byte [DelFile_LNEL], 0 ; 0FFh if cf = 1
  2528                              <1> 
  2529 0000ACEA E8C8FCFFFF          <1> 	call	update_parent_dir_lmdt
  2530 0000ACEF B700                <1> 	mov	bh, 0
  2531 0000ACF1 80D700              <1> 	adc	bh, 0
  2532                              <1> 
  2533 0000ACF4 8A1D[EE620100]      <1> 	mov	bl, byte [DelFile_LNEL]
  2534                              <1>  
  2535                              <1> loc_delete_direntry_return:
  2536 0000ACFA A1[E8620100]        <1> 	mov	eax, [DelFile_FCluster]
  2537                              <1> loc_delete_direntry_err_return:
  2538 0000ACFF C3                  <1> 	retn
  2539                              <1> 
  2540                              <1> rename_directory_entry:
  2541                              <1> 	; 13/11/2017
  2542                              <1> 	; 15/10/2016
  2543                              <1> 	; 06/03/2016 (TRDOS 386 = TRDOS v2.0)
  2544                              <1> 	; 01/08/2011 (DIR.ASM, 'proc_rename_directory_entry')
  2545                              <1> 	; 19/11/2010
  2546                              <1> 	; INPUT -> (Current Directory)
  2547                              <1> 	;	CX = Directory Entry Number
  2548                              <1> 	;      EAX = First Cluster number of file or directory
  2549                              <1> 	;      EBX = Longname Length (dir entry count) (< 256)
  2550                              <1> 	;      ESI = New file (or directory) name (no path).
  2551                              <1> 	;           (ASCIIZ string)  
  2552                              <1> 	; OUTPUT -> 
  2553                              <1> 	;      CF = 0 -> successfull
  2554                              <1> 	;      CF = 1 -> error code in EAX (AL)
  2555                              <1> 	;
  2556                              <1> 	; (EAX, EBX, ECX, EDX, ESI, EDI will be changed)
  2557                              <1> 
  2558 0000AD00 803D[85590100]00    <1> 	cmp	byte [Current_FATType], 0
  2559 0000AD07 7706                <1> 	ja	short loc_rename_directory_entry
  2560                              <1> 
  2561 0000AD09 E8B80E0000          <1> 	call	rename_fs_file_or_directory
  2562 0000AD0E C3                  <1> 	retn 
  2563                              <1> 	
  2564                              <1> loc_rename_directory_entry:
  2565 0000AD0F 881D[EE620100]      <1> 	mov	[DelFile_LNEL], bl
  2566 0000AD15 66890D[EC620100]    <1> 	mov	[DelFile_EntryCounter], cx
  2567 0000AD1C A3[E8620100]        <1> 	mov	[DelFile_FCluster], eax
  2568                              <1> 
  2569 0000AD21 0FB7C1              <1> 	movzx	eax, cx
  2570 0000AD24 E8BBFDFFFF          <1> 	call	locate_current_dir_entry
  2571 0000AD29 7308                <1> 	jnc	short loc_rename_direntry_check_fcluster
  2572                              <1> 
  2573                              <1> loc_rename_direntry_pop_retn:
  2574 0000AD2B C3                  <1> 	retn
  2575                              <1> 
  2576                              <1> loc_rename_direntry_pop_invd_retn:
  2577 0000AD2C F9                  <1> 	stc
  2578                              <1> loc_rename_direntry_invd_retn:
  2579                              <1> 	; 15/10/2016 (0Dh -> 29)
  2580 0000AD2D B81D000000          <1> 	mov	eax, 29 ; Invalid data
  2581                              <1> loc_rename_retn:
  2582 0000AD32 C3                  <1> 	retn 
  2583                              <1> 
  2584                              <1> loc_rename_direntry_check_fcluster:
  2585 0000AD33 668B5714            <1> 	mov	dx, [edi+20] ; First Cluster HW
  2586 0000AD37 C1E210              <1> 	shl	edx, 16 ; 13/11/2017
  2587 0000AD3A 668B571A            <1> 	mov	dx, [edi+26] ; First Cluster LW
  2588 0000AD3E 3B15[E8620100]      <1> 	cmp	edx, [DelFile_FCluster]
  2589 0000AD44 75E6                <1> 	jne	short loc_rename_direntry_pop_invd_retn
  2590                              <1> 	; ESI = New file (or directory) name. (ASCIIZ string)
  2591                              <1> 	; 06/03/2016
  2592                              <1> 	; TRDOS v2 - NOTE: 'convert_file_name' procedure
  2593                              <1> 	; has been modified for eliminating following situation.
  2594                              <1> 	; 
  2595                              <1> 	; TRDOS v1 - NOTE: If file/dir name is more than 11 bytes
  2596                              <1> 	; without a dot, attributes (edi+11) byte will be overwritten !
  2597                              <1> 	; (Dot file name input must be proper for 11 byte dir entry
  2598                              <1> 	;  type file name output.) 
  2599 0000AD46 E8A2F6FFFF          <1> 	call	convert_file_name
  2600                              <1> 
  2601 0000AD4B C605[AC600100]02    <1>         mov     byte [DirBuff_ValidData], 2
  2602 0000AD52 E8C5FBFFFF          <1> 	call	save_directory_buffer
  2603 0000AD57 72D9                <1> 	jc	short loc_rename_retn
  2604                              <1> 
  2605                              <1> loc_rename_direntry_del_ln:
  2606 0000AD59 0FB615[EE620100]    <1> 	movzx	edx, byte [DelFile_LNEL]
  2607 0000AD60 08D2                <1> 	or	dl, dl
  2608 0000AD62 7410                <1> 	jz	short loc_rename_direntry_update_parent_dir_lm_date
  2609                              <1> 
  2610 0000AD64 0FB705[EC620100]    <1> 	movzx	eax, word [DelFile_EntryCounter]
  2611 0000AD6B 29D0                <1> 	sub	eax, edx
  2612 0000AD6D 72BE                <1> 	jc	short loc_rename_direntry_invd_retn
  2613                              <1> 
  2614                              <1> loc_rename_direntry_del_ln_continue: 
  2615                              <1> 	; EAX = Directory Entry Number of the long name last entry
  2616 0000AD6F E806FDFFFF          <1> 	call	delete_longname
  2617                              <1> 
  2618                              <1> loc_rename_direntry_update_parent_dir_lm_date:
  2619 0000AD74 E83EFCFFFF          <1> 	call	update_parent_dir_lmdt
  2620 0000AD79 31C0                <1> 	xor	eax, eax 
  2621 0000AD7B C3                  <1> 	retn
  2622                              <1> 
  2623                              <1> move_source_file_to_destination_file:
  2624                              <1> 	; 15/10/2016
  2625                              <1> 	; 11/03/2016
  2626                              <1> 	; 10/03/2016 (TRDOS 386 = TRDOS v2.0)
  2627                              <1> 	; 01/08/2011 (FILE.ASM)
  2628                              <1> 	; 04/08/2010
  2629                              <1> 	;
  2630                              <1> 	;   Phase 1 -> Check destination file, 
  2631                              <1> 	;              'not found' is required
  2632                              <1> 	;   Phase 2 -> Check source file
  2633                              <1> 	;              'found' and proper attributes is required
  2634                              <1> 	;   Phase 3 -> Make destination directory entry,
  2635                              <1> 	;           add new dir cluster or section if it is required
  2636                              <1> 	;   Phase 4 -> Delete source directory entry.
  2637                              <1> 	;       cf = 1 causes to return before the phase 4.
  2638                              <1> 	;    (source file protection against any possible errors)    
  2639                              <1> 	;
  2640                              <1> 	; 08/05/2011 major modification
  2641                              <1> 	;            -> destination file deleting is removed   
  2642                              <1> 	;            for msdos move/rename compatibility.
  2643                              <1> 	;            (Access denied error will return if
  2644                              <1> 	;            the destination file is found...)
  2645                              <1> 	; INPUT ->
  2646                              <1> 	;	 ESI = Source File Pathname (Asciiz)
  2647                              <1> 	;        EDI = Destination File Pathname (Asciiz)
  2648                              <1> 	;        AL = 0 --> Interrupt (System call)
  2649                              <1> 	;        AL > 0 --> Command Interpreter (Question)
  2650                              <1> 	;        AL = 1 --> Question Phase
  2651                              <1> 	;        AL = 2 --> Progress Phase        
  2652                              <1> 	; OUTPUT -> 
  2653                              <1> 	;	 cf = 0 -> OK
  2654                              <1> 	;        EAX = Destination directory first cluster
  2655                              <1> 	;        ESI = Logical DOS drive description table 
  2656                              <1> 	;        EBX = Destination file structure offset
  2657                              <1> 	;        CX = 0 (CX > 0 --> calculate free space error)
  2658                              <1> 	;        cf = 1 -> Error code in EAX (AL) 
  2659                              <1> 	;
  2660                              <1> 	;  (EDX, ECX, EBX, ESI, EDI will be changed)
  2661                              <1> 
  2662 0000AD7C 3C02                <1> 	cmp	al, 2
  2663 0000AD7E 0F847F010000        <1> 	je	msftdf_df2_check_directory
  2664 0000AD84 A2[6E640100]        <1> 	mov	[move_cmd_phase], al
  2665                              <1> 
  2666                              <1> msftdf_parse_sf_path:
  2667                              <1> 	; ESI = ASCIIZ pathname (Source)
  2668 0000AD89 57                  <1> 	push	edi 
  2669 0000AD8A BF[6C630100]        <1> 	mov	edi, SourceFile_Drv
  2670 0000AD8F E824F7FFFF          <1> 	call	parse_path_name
  2671 0000AD94 5E                  <1> 	pop	esi
  2672 0000AD95 7211                <1> 	jc	short msftdf_psf_retn
  2673                              <1> 
  2674                              <1> msftdf_parse_df_path:
  2675                              <1> 	; ESI = ASCIIZ pathname	(Destination)
  2676 0000AD97 BF[EC630100]        <1> 	mov	edi, DestinationFile_Drv
  2677 0000AD9C E817F7FFFF          <1> 	call	parse_path_name
  2678 0000ADA1 7306                <1> 	jnc	short msftdf_check_sf_drv
  2679                              <1> 
  2680 0000ADA3 3C01                <1> 	cmp	al, 1 ; File or directory name is not existing
  2681 0000ADA5 7602                <1> 	jna	short msftdf_check_sf_drv
  2682                              <1> 
  2683                              <1> msftdf_stc_retn:
  2684 0000ADA7 F9                  <1> 	stc
  2685                              <1> msftdf_psf_retn:
  2686 0000ADA8 C3                  <1> 	retn 
  2687                              <1> 
  2688                              <1> msftdf_check_sf_drv:
  2689 0000ADA9 A0[6C630100]        <1> 	mov	al, [SourceFile_Drv]
  2690                              <1> 
  2691                              <1> msftdf_check_df_drv:
  2692 0000ADAE 8A15[EC630100]      <1> 	mov	dl, [DestinationFile_Drv]
  2693                              <1> 
  2694                              <1> msftdf_compare_sf_df_drv:
  2695 0000ADB4 29DB                <1> 	sub	ebx, ebx
  2696 0000ADB6 8A3D[86590100]      <1> 	mov	bh, [Current_Drv]
  2697 0000ADBC 38C2                <1> 	cmp	dl, al
  2698 0000ADBE 7409                <1> 	je	short msftdf_check_sf_df_drv_ok
  2699                              <1> 
  2700                              <1> msftdf_not_same_drv:
  2701                              <1>         ; DL = source file's drive number
  2702 0000ADC0 88C6                <1> 	mov	dh, al ; destination file's drive number
  2703                              <1> 	; 15/10/2016 (11h -> 21)
  2704 0000ADC2 B815000000          <1> 	mov	eax, 21 ; Not the same drive
  2705 0000ADC7 F9                  <1> 	stc
  2706 0000ADC8 C3                  <1> 	retn 
  2707                              <1> 
  2708                              <1> msftdf_check_sf_df_drv_ok:
  2709 0000ADC9 8815[6F640100]      <1> 	mov	[msftdf_sf_df_drv], dl
  2710                              <1> 
  2711 0000ADCF 29C0                <1>         sub	eax, eax
  2712 0000ADD1 88D4                <1> 	mov	ah, dl
  2713 0000ADD3 0500010900          <1> 	add	eax, Logical_DOSDisks
  2714 0000ADD8 A3[70640100]        <1> 	mov	[msftdf_drv_offset], eax
  2715                              <1> 
  2716 0000ADDD 38FA                <1> 	cmp	dl, bh ; byte [Current_Drv]
  2717 0000ADDF 7407                <1> 	je	short msftdf_df_check_directory
  2718                              <1> 
  2719                              <1> msftdf_change_drv:
  2720 0000ADE1 E85EC1FFFF          <1> 	call 	change_current_drive
  2721 0000ADE6 726D                <1> 	jc	short msftdf_df_error_retn
  2722                              <1> 	  
  2723                              <1> msftdf_check_destination_file:
  2724                              <1> msftdf_df_check_directory:
  2725 0000ADE8 BE[ED630100]        <1> 	mov	esi, DestinationFile_Directory
  2726 0000ADED 803E20              <1> 	cmp	byte [esi], 20h
  2727 0000ADF0 760F                <1> 	jna	short msftdf_df_find_1
  2728                              <1> 
  2729                              <1> msftdf_df_change_directory:
  2730 0000ADF2 FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  2731 0000ADF8 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2732 0000ADFA E8A3F0FFFF          <1> 	call	change_current_directory
  2733 0000ADFF 7254                <1> 	jc	short msftdf_df_error_retn
  2734                              <1> 
  2735                              <1> ;msftdf_df_change_prompt_dir_string:
  2736                              <1> ;	call 	change_prompt_dir_string
  2737                              <1> 
  2738                              <1> msftdf_df_find_1:
  2739 0000AE01 BE[2E640100]        <1>         mov     esi, DestinationFile_Name
  2740 0000AE06 803E20              <1> 	cmp	byte [esi], 20h
  2741 0000AE09 7631                <1> 	jna	short msftdf_df_copy_sf_name
  2742                              <1> 
  2743                              <1> msftdf_df_find_2:
  2744 0000AE0B 6631C0              <1> 	xor	ax, ax ; DestinationFile_AttributesMask -> any/zero
  2745 0000AE0E E8D4D4FFFF          <1> 	call	find_first_file
  2746 0000AE13 0F838D000000        <1> 	jnc	msftdf_permission_denied_retn
  2747                              <1> 
  2748                              <1> msftdf_df_check_error_code:
  2749                              <1> 	;cmp	eax, 2 ; File not found error
  2750 0000AE19 3C02                <1> 	cmp	al, 2
  2751 0000AE1B 7537                <1> 	jne	short msftdf_df_stc_retn
  2752                              <1>               
  2753                              <1> msftdf_df_check_fname:
  2754                              <1> 	; 15/10/2016
  2755 0000AE1D BE[2E640100]        <1> 	mov	esi, DestinationFile_Name ; *
  2756 0000AE22 E87ED8FFFF          <1> 	call	check_filename
  2757 0000AE27 7307                <1> 	jnc	short msftdf_convert_df_direntry_name
  2758                              <1> 	; invalid file name chars !
  2759 0000AE29 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME  ; 26
  2760 0000AE2E EB24                <1> 	jmp	short msftdf_df_stc_retn
  2761                              <1> 
  2762                              <1> msftdf_convert_df_direntry_name:
  2763                              <1> 	; mov	esi, DestinationFile_Name ; *
  2764 0000AE30 BF[3E640100]        <1> 	mov	edi, DestinationFile_DirEntry
  2765 0000AE35 E8B3F5FFFF          <1> 	call	convert_file_name
  2766 0000AE3A EB1A                <1>   	jmp	short msftdf_restore_current_dir_1
  2767                              <1> 
  2768                              <1> msftdf_df_copy_sf_name:
  2769 0000AE3C 89F7                <1> 	mov	edi, esi
  2770 0000AE3E 57                  <1> 	push	edi 
  2771 0000AE3F BE[AE630100]        <1>         mov     esi, SourceFile_Name
  2772 0000AE44 B90C000000          <1> 	mov	ecx, 12
  2773                              <1> msftdf_df_copy_sf_name_loop:
  2774 0000AE49 AC                  <1> 	lodsb
  2775 0000AE4A AA                  <1>         stosb
  2776 0000AE4B 08C0                <1> 	or	al, al
  2777 0000AE4D 7402                <1> 	jz	short msftdf_df_copy_sf_name_ok	
  2778 0000AE4F E2F8                <1>         loop    msftdf_df_copy_sf_name_loop
  2779                              <1> msftdf_df_copy_sf_name_ok:	
  2780 0000AE51 5E                  <1> 	pop	esi  
  2781 0000AE52 EBB7                <1> 	jmp	short msftdf_df_find_2
  2782                              <1> 
  2783                              <1> msftdf_df_stc_retn:
  2784 0000AE54 F9                  <1> 	stc
  2785                              <1> msftdf_restore_cdir_failed:
  2786                              <1> msftdf_df_error_retn:
  2787 0000AE55 C3                  <1> 	retn
  2788                              <1> 
  2789                              <1> msftdf_restore_current_dir_1:
  2790 0000AE56 803D[620D0100]00    <1> 	cmp	byte [Restore_CDIR], 0
  2791 0000AE5D 760D                <1> 	jna	short msftdf_sf_check_directory
  2792 0000AE5F 8B35[70640100]      <1> 	mov	esi, [msftdf_drv_offset] 
  2793 0000AE65 E891C1FFFF          <1> 	call	restore_current_directory
  2794 0000AE6A 72E9                <1> 	jc	short msftdf_restore_cdir_failed
  2795                              <1> 
  2796                              <1> msftdf_sf_check_directory:
  2797 0000AE6C BE[6D630100]        <1> 	mov	esi, SourceFile_Directory
  2798 0000AE71 803E20              <1> 	cmp	byte [esi], 20h
  2799 0000AE74 760F                <1> 	jna	short msftdf_sf_find
  2800                              <1> msftdf_sf_change_directory:
  2801 0000AE76 FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  2802 0000AE7C 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2803 0000AE7E E81FF0FFFF          <1> 	call	change_current_directory
  2804 0000AE83 7227                <1> 	jc	short msftdf_return
  2805                              <1> 
  2806                              <1> ;msftdf_sf_change_prompt_dir_string:
  2807                              <1> ;	call	change_prompt_dir_string
  2808                              <1> 
  2809                              <1> msftdf_sf_find:
  2810 0000AE85 BE[AE630100]        <1>         mov     esi, SourceFile_Name  ; Offset 66
  2811 0000AE8A 66B80018            <1> 	mov	ax, 1800h ; Only files
  2812 0000AE8E E854D4FFFF          <1> 	call	find_first_file
  2813 0000AE93 7217                <1> 	jc	short msftdf_return
  2814                              <1> 
  2815                              <1> msftdf_sf_ambgfn_check:
  2816 0000AE95 6609D2              <1> 	or	dx, dx ; Ambiguous filename chars used sign (DX>0)
  2817 0000AE98 7407                <1> 	jz	short msftdf_sf_found
  2818                              <1> 
  2819                              <1> msftdf_ambiguous_file_name_error:
  2820 0000AE9A B802000000          <1> 	mov	eax, 2 ; File not found error
  2821 0000AE9F F9                  <1> 	stc
  2822 0000AEA0 C3                  <1> 	retn
  2823                              <1> 
  2824                              <1> msftdf_sf_found:
  2825 0000AEA1 80E31F              <1> 	and	bl, 1Fh ; Attributes, D-V-S-H-R
  2826 0000AEA4 7416                <1> 	jz	short msftdf_save_sf_structure
  2827                              <1> 
  2828                              <1> msftdf_permission_denied_retn:
  2829 0000AEA6 B805000000          <1> 	mov	eax, 05h ; Access (Permission) denied !
  2830 0000AEAB F9                  <1> 	stc
  2831                              <1> msftdf_rest_cdir_err_retn:
  2832                              <1> msftdf_return:
  2833 0000AEAC C3                  <1> 	retn
  2834                              <1> 
  2835                              <1> msftdf_phase_1_return:
  2836 0000AEAD 31C0                <1> 	xor	eax, eax
  2837 0000AEAF A2[6E640100]        <1> 	mov	[move_cmd_phase], al ; 0
  2838 0000AEB4 FEC0                <1> 	inc	al ; mov al, 1
  2839 0000AEB6 BB[03AF0000]        <1> 	mov	ebx, msftdf_df2_check_directory
  2840                              <1> 	;mov	edx, 0FFFFFFFFh 
  2841 0000AEBB C3                  <1> 	retn
  2842                              <1> 
  2843                              <1> msftdf_save_sf_structure:
  2844 0000AEBC BE[78620100]        <1> 	mov	esi, FindFile_DirEntry
  2845 0000AEC1 BF[BE630100]        <1> 	mov	edi, SourceFile_DirEntry
  2846 0000AEC6 B908000000          <1> 	mov	ecx, 8
  2847 0000AECB F3A5                <1> 	rep	movsd
  2848                              <1> 
  2849                              <1> msftdf_df_copy_sf_parameters:
  2850 0000AECD BE0B000000          <1> 	mov	esi, 11
  2851 0000AED2 89F7                <1> 	mov	edi, esi
  2852 0000AED4 81C6[BE630100]      <1> 	add	esi, SourceFile_DirEntry
  2853 0000AEDA 81C7[3E640100]      <1> 	add	edi, DestinationFile_DirEntry
  2854                              <1> 	;mov	ecx, 21
  2855 0000AEE0 B115                <1> 	mov	cl, 21
  2856 0000AEE2 F3A4                <1> 	rep	movsb
  2857                              <1> 
  2858                              <1> msftdf_restore_current_dir_2:
  2859 0000AEE4 803D[620D0100]00    <1> 	cmp	byte [Restore_CDIR], 0
  2860 0000AEEB 760D                <1> 	jna	short msftdf_df2_check_move_cmd_phase
  2861 0000AEED 8B35[70640100]      <1>  	mov	esi, [msftdf_drv_offset]
  2862 0000AEF3 E803C1FFFF          <1> 	call	restore_current_directory
  2863 0000AEF8 72B2                <1> 	jc	short msftdf_rest_cdir_err_retn
  2864                              <1> 
  2865                              <1> msftdf_df2_check_move_cmd_phase:
  2866 0000AEFA 803D[6E640100]01    <1> 	cmp	byte [move_cmd_phase], 1
  2867 0000AF01 74AA                <1> 	je	short msftdf_phase_1_return
  2868                              <1> 
  2869                              <1> msftdf_df2_check_directory:
  2870 0000AF03 BE[ED630100]        <1> 	mov	esi, DestinationFile_Directory
  2871 0000AF08 803E20              <1> 	cmp	byte [esi], 20h
  2872 0000AF0B 760F                <1> 	jna	short msftdf_make_dfde_locate_ffe_on_directory
  2873                              <1> msftdf_df2_change_directory:
  2874 0000AF0D FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  2875 0000AF13 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  2876 0000AF15 E888EFFFFF          <1> 	call	change_current_directory
  2877 0000AF1A 7290                <1> 	jc	short msftdf_return
  2878                              <1> 
  2879                              <1> ;msftdf_df2_change_prompt_dir_string:
  2880                              <1> ;	call	change_prompt_dir_string
  2881                              <1> 
  2882                              <1> msftdf_make_dfde_locate_ffe_on_directory:
  2883                              <1> 	; Current directory fcluster <> Directory buffer cluster
  2884                              <1> 	; Current directory will be reloaded by
  2885                              <1> 	; 'locate_current_dir_file' procedure
  2886                              <1> 	;
  2887                              <1> 	;xor	ax, ax
  2888 0000AF1C 31C0                <1> 	xor	eax, eax
  2889 0000AF1E 89C1                <1> 	mov	ecx, eax
  2890 0000AF20 6649                <1> 	dec	cx ; FFFFh  
  2891                              <1> 		; CX = FFFFh -> find first deleted or free entry
  2892                              <1> 		; ESI would be ASCIIZ filename address if the call
  2893                              <1> 		; would not be for first free or deleted dir entry  
  2894 0000AF22 E8CFF1FFFF          <1> 	call	locate_current_dir_file
  2895 0000AF27 733F                <1> 	jnc	msftdf_make_dfde_set_ff_dir_entry
  2896                              <1> 	
  2897                              <1> 	;cmp	eax, 2
  2898 0000AF29 3C02                <1>         cmp	al, 2
  2899 0000AF2B 7537                <1> 	jne	short msftdf_error_retn
  2900                              <1> 
  2901                              <1> msftdf_add_new_dir_entry_check_fs:
  2902 0000AF2D 8B35[70640100]      <1> 	mov	esi, [msftdf_drv_offset]
  2903 0000AF33 A1[B1600100]        <1> 	mov 	eax, [DirBuff_Cluster]
  2904 0000AF38 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  2905 0000AF3C 7711                <1> 	ja	short msftdf_add_new_subdir_cluster
  2906                              <1> 
  2907                              <1> msftdf_add_new_fs_subdir_section:
  2908                              <1> 	;CL=0, CH=E5h --> deleted entry, CH=0 --> free entry
  2909                              <1>         ;xor	cx, cx
  2910 0000AF3E 30ED                <1> 	xor	ch, ch ; cx = 0 --> add a new subdir section
  2911 0000AF40 E8830C0000          <1> 	call	add_new_fs_section
  2912 0000AF45 721E                <1>         jc	short msftdf_dsfde_error_retn
  2913                              <1> 	;mov	[createfile_LastDirCluster], eax
  2914                              <1> 
  2915 0000AF47 E8A30E0000          <1> 	call	load_FS_sub_directory 
  2916                              <1> 	;mov	ebx, Directory_Buffer 
  2917 0000AF4C 7318                <1> 	jnc	short msftdf_add_new_fs_subdir_section_ok
  2918 0000AF4E C3                  <1> 	retn	 
  2919                              <1> 
  2920                              <1> msftdf_add_new_subdir_cluster:
  2921 0000AF4F E881150000          <1> 	call	add_new_cluster
  2922 0000AF54 720F                <1> 	jc	short msftdf_dsfde_error_retn
  2923                              <1> 	
  2924                              <1> 	;mov	[createfile_LastDirCluster], eax
  2925                              <1> 
  2926 0000AF56 E8570E0000          <1> 	call	load_FAT_sub_directory
  2927 0000AF5B 7309                <1> 	jnc	short msftdf_add_new_subdir_cluster_ok
  2928                              <1> 	; EBX = Directory buffer address
  2929                              <1> 
  2930                              <1> msftdf_ansdc_update_parent_dir_lmdt:
  2931                              <1> msftdf_make_dfde_err_upd_pdir_lmdt:
  2932 0000AF5D 50                  <1> 	push	eax
  2933 0000AF5E E854FAFFFF          <1> 	call	update_parent_dir_lmdt
  2934 0000AF63 58                  <1> 	pop	eax
  2935                              <1> 
  2936                              <1> msftdf_error_retn:
  2937 0000AF64 F9                  <1> 	stc
  2938                              <1> msftdf_dsfde_restore_cdir_failed:
  2939                              <1> msftdf_dsfde_error_retn:
  2940 0000AF65 C3                  <1> 	retn
  2941                              <1> 
  2942                              <1> msftdf_add_new_fs_subdir_section_ok:
  2943                              <1> msftdf_add_new_subdir_cluster_ok:
  2944 0000AF66 89DF                <1> 	mov	edi, ebx ; Directory buffer address
  2945                              <1> 
  2946                              <1> msftdf_make_dfde_set_ff_dir_entry:
  2947 0000AF68 8B15[80590100]      <1> 	mov	edx, [Current_Dir_FCluster]
  2948 0000AF6E 8915[D4640100]      <1> 	mov	[createfile_FFCluster], edx
  2949                              <1> 	; EDI = Directory entry offset
  2950 0000AF74 BE[3E640100]        <1> 	mov	esi, DestinationFile_DirEntry
  2951 0000AF79 B908000000          <1> 	mov	ecx, 8
  2952 0000AF7E F3A5                <1> 	rep	movsd
  2953                              <1> 
  2954 0000AF80 C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2 
  2955 0000AF87 E890F9FFFF          <1> 	call	save_directory_buffer
  2956 0000AF8C 72CF                <1> 	jc	short msftdf_make_dfde_err_upd_pdir_lmdt
  2957                              <1> 
  2958                              <1> msftdf_make_dfde_update_pdir_lmdt:
  2959 0000AF8E E824FAFFFF          <1> 	call	update_parent_dir_lmdt
  2960                              <1> 
  2961                              <1> msftdf_dsfde_restore_current_dir_1:
  2962 0000AF93 803D[620D0100]00    <1> 	cmp	byte [Restore_CDIR], 0
  2963 0000AF9A 760D                <1> 	jna	short msftdf_dsfde_check_directory
  2964 0000AF9C 8B35[70640100]      <1>  	mov	esi, [msftdf_drv_offset]
  2965 0000AFA2 E854C0FFFF          <1> 	call	restore_current_directory
  2966 0000AFA7 72BC                <1> 	jc	short msftdf_dsfde_restore_cdir_failed
  2967                              <1> 
  2968                              <1> msftdf_dsfde_check_directory:
  2969 0000AFA9 BE[6D630100]        <1> 	mov	esi, SourceFile_Directory
  2970 0000AFAE 803E20              <1> 	cmp	byte [esi], 20h
  2971 0000AFB1 760F                <1> 	jna	short msftdf_dsfde_find_file
  2972                              <1> 
  2973                              <1> msftdf_dsfde_change_directory:
  2974 0000AFB3 FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  2975 0000AFB9 28E4                <1> 	sub	ah, ah ; CD_COMMAND sign -> 0 
  2976 0000AFBB E8E2EEFFFF          <1> 	call	change_current_directory
  2977 0000AFC0 72A3                <1> 	jc	short msftdf_dsfde_error_retn
  2978                              <1> 
  2979                              <1> ;msftdf_dsfde_sf_change_prompt_dir_string:
  2980                              <1> ;	call	change_prompt_dir_string
  2981                              <1> 
  2982                              <1> msftdf_dsfde_find_file:
  2983 0000AFC2 BE[AE630100]        <1> 	mov	esi, SourceFile_Name  ; Offset 66
  2984 0000AFC7 668B460E            <1> 	mov	ax, [esi+14] ; 80 -> SourceFile_AttributesMask
  2985 0000AFCB E817D3FFFF          <1> 	call	find_first_file
  2986 0000AFD0 7293                <1> 	jc	short msftdf_dsfde_error_retn
  2987                              <1> 
  2988                              <1> msftdf_dsfde_delete_direntry:
  2989 0000AFD2 8B35[70640100]      <1> 	mov	esi, [msftdf_drv_offset]
  2990                              <1> 	
  2991 0000AFD8 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  2992 0000AFDC 770A                <1> 	ja	short msftdf_delete_FAT_direntry
  2993                              <1> 	
  2994 0000AFDE 30DB                <1> 	xor	bl, bl
  2995                              <1> 	; BL = 0 -> File
  2996                              <1> 	; EDI -> Directory buffer entry offset/address 
  2997 0000AFE0 E8E40B0000          <1> 	call	delete_fs_directory_entry
  2998 0000AFE5 7315                <1> 	jnc	short msftdf_dsfde_restore_current_dir_2
  2999 0000AFE7 C3                  <1> 	retn
  3000                              <1> 
  3001                              <1> msftdf_delete_FAT_direntry:	
  3002 0000AFE8 8A1D[75620100]      <1> 	mov	bl, [FindFile_LongNameEntryLength]
  3003 0000AFEE 668B0D[A0620100]    <1> 	mov	cx, [FindFile_DirEntryNumber]
  3004                              <1> 	; ESI = Logical DOS drive description table address
  3005                              <1> 	; EDI = Directory buffer entry offset/address 
  3006 0000AFF5 E89AFCFFFF          <1> 	call	delete_directory_entry
  3007 0000AFFA 721C                <1> 	jc	short msftdf_retn
  3008                              <1> 
  3009                              <1> msftdf_dsfde_restore_current_dir_2:
  3010 0000AFFC 803D[620D0100]00    <1> 	cmp	byte [Restore_CDIR], 0
  3011 0000B003 7607                <1> 	jna	short msftdf_new_dir_fcluster_retn
  3012                              <1> 	;mov	esi, [msftdf_drv_offset]
  3013 0000B005 E8F1BFFFFF          <1> 	call	restore_current_directory
  3014 0000B00A 720C                <1> 	jc	short msftdf_retn
  3015                              <1> 
  3016                              <1> msftdf_new_dir_fcluster_retn:
  3017 0000B00C 31C9                <1> 	xor	ecx, ecx 
  3018 0000B00E A1[D4640100]        <1> 	mov	eax, [createfile_FFCluster]
  3019 0000B013 BB[EC630100]        <1> 	mov	ebx, DestinationFile_Drv
  3020                              <1> 
  3021                              <1> msftdf_retn:
  3022 0000B018 C3                  <1> 	retn
  3023                              <1> 
  3024                              <1> 
  3025                              <1> copy_source_file_to_destination_file:
  3026                              <1> 	; 17/10/2016
  3027                              <1> 	; 16/10/2016
  3028                              <1> 	; 15/10/2016
  3029                              <1> 	; 30/03/2016, 31/03/2016
  3030                              <1> 	; 24/03/2016, 25/03/2016, 28/03/2016
  3031                              <1> 	; 21/03/2016, 22/03/2016, 23/03/2016
  3032                              <1> 	; 16/03/2016, 17/03/2016, 18/03/2016
  3033                              <1> 	; 15/03/2016 (TRDOS 386 = TRDOS v2.0)
  3034                              <1> 	; 02/09/2011 (FILE.ASM 'copy_source_file_to_destination_file')
  3035                              <1> 	; 01/08/2010 - 18/05/2011
  3036                              <1> 	;
  3037                              <1> 	;   Command Interpreter phase 1 enter ->
  3038                              <1> 	;           AL = 1 -> Caller is command interpreter
  3039                              <1> 	;           AL = 2 -> The second call, re-enter/continue
  3040                              <1> 	;   Phase 1 -> Check source file
  3041                              <1> 	;              'found' is required
  3042                              <1> 	;   Phase 2 -> Check destination file, 
  3043                              <1> 	;              save 'found' or 'not found' status
  3044                              <1> 	;              'permission denied' error will be return
  3045                              <1> 	;              if attributes have not for ordinary file 
  3046                              <1> 	;              without readonly attribute
  3047                              <1> 	;   Command Interpreter phase 1 return ->
  3048                              <1> 	;              DH = Source file attributes
  3049                              <1> 	;              DL = Destination file found status
  3050                              <1> 	;              EAX = 0 
  3051                              <1> 	;   Command Interpreter phase 2 enter ->
  3052                              <1> 	;              AL = 2 -> Continue from the last position
  3053                              <1> 	;              AH = 
  3054                              <1> 	;   Phase 3 -> Load source file or use read/write cluster method
  3055                              <1> 	;   Phase 4 -> Create destination file if it is not found
  3056                              <1> 	;   Phase 5 -> Open destination file
  3057                              <1> 	;   Phase 6 -> Read from source and write to destination
  3058                              <1> 	;   Phase 7 -> Unload source file, if it is loaded at memory
  3059                              <1> 	;       cf = 1 causes to return before the phase 7
  3060                              <1> 	;              but loaded file will be unloaded
  3061                              <1> 	;	       (allocated memory block will be deallocated) 
  3062                              <1> 	;
  3063                              <1> 	; INPUT -> 
  3064                              <1> 	;	 ESI = Source File Pathname (Asciiz)
  3065                              <1> 	;        EDI = Destination File Pathname (Asciiz)
  3066                              <1> 	;        AL = 0 --> Interrupt (System call)
  3067                              <1> 	;        AL > 0 --> Command Interpreter (Question)
  3068                              <1> 	;        AL = 1 --> Question Phase
  3069                              <1> 	;        AL = 2 --> Progress Phase        
  3070                              <1> 	;
  3071                              <1> 	; OUTPUT -> 
  3072                              <1> 	;	cf = 0 -> OK
  3073                              <1> 	;	EAX = Destination file first cluster
  3074                              <1> 	;
  3075                              <1> 	;        CL > 0 if there is file reading error before EOF
  3076                              <1> 	;	        (incomplete copy) 
  3077                              <1> 	;        CH > 0 if file is (full) loaded at memory
  3078                              <1> 	;
  3079                              <1> 	;	cf = 1 -> Error code in AL (EAX) 
  3080                              <1> 	;
  3081                              <1> 	; (EBX, ECX, ESI, EDI register contents will be changed)           
  3082                              <1> 
  3083                              <1> 
  3084 0000B019 3C02                <1> 	cmp	al, 2
  3085 0000B01B 0F845A020000        <1> 	je	csftdf2_check_cdrv
  3086                              <1> 
  3087                              <1> ; Phase 1
  3088                              <1> 
  3089 0000B021 A2[94640100]        <1> 	mov	byte [copy_cmd_phase], al
  3090                              <1> 
  3091 0000B026 57                  <1> 	push	edi ; *
  3092                              <1> 
  3093                              <1> csftdf_parse_sf_path:
  3094 0000B027 BF[6C630100]        <1> 	mov	edi, SourceFile_Drv
  3095 0000B02C E887F4FFFF          <1> 	call	parse_path_name
  3096 0000B031 721C                <1> 	jc	short csftdf_parse_sf_path_failed
  3097                              <1> 
  3098                              <1> csftdf_parse_df_path:	
  3099 0000B033 5E                  <1> 	pop	esi ; * (pushed edi) 
  3100                              <1> 
  3101                              <1> csftdf_sf_check_filename_exists:
  3102 0000B034 803D[AE630100]21    <1> 	cmp	byte [SourceFile_Name], 21h
  3103 0000B03B 7215                <1> 	jb	short csftdf_sf_file_not_found_error
  3104                              <1> 
  3105 0000B03D BF[EC630100]        <1> 	mov	edi, DestinationFile_Drv
  3106 0000B042 E871F4FFFF          <1> 	call	parse_path_name
  3107 0000B047 7310                <1> 	jnc	short csftdf_check_sf_cdrv
  3108                              <1> 	
  3109 0000B049 3C01                <1> 	cmp	al, 1 ; File or directory name is not existing
  3110 0000B04B 760C                <1> 	jna	short csftdf_check_sf_cdrv
  3111                              <1> 
  3112                              <1> csftdf_parse_df_path_failed:
  3113 0000B04D F9                  <1> 	stc 
  3114                              <1> csftdf_sf_error_retn: 
  3115 0000B04E C3                  <1> 	retn
  3116                              <1> 
  3117                              <1> csftdf_parse_sf_path_failed:	
  3118 0000B04F 5F                  <1> 	pop	edi ; *
  3119 0000B050 EBFC                <1> 	jmp	short csftdf_sf_error_retn
  3120                              <1> 
  3121                              <1> csftdf_sf_file_not_found_error:
  3122 0000B052 B802000000          <1> 	mov	eax, 2 ; File not found 
  3123 0000B057 EBF5                <1> 	jmp	short csftdf_sf_error_retn
  3124                              <1> 
  3125                              <1> csftdf_check_sf_cdrv:
  3126 0000B059 8A3D[86590100]      <1> 	mov	bh, [Current_Drv]
  3127                              <1> 
  3128 0000B05F 883D[97640100]      <1> 	mov	[csftdf_cdrv], bh ; 23/03/2016
  3129                              <1> 
  3130 0000B065 8A15[6C630100]      <1> 	mov	dl, [SourceFile_Drv]
  3131 0000B06B 38FA                <1> 	cmp	dl, bh ; byte [Current_Drv]
  3132 0000B06D 7407                <1> 	je	short csftdf_sf_check_directory
  3133                              <1> 
  3134 0000B06F E8D0BEFFFF          <1> 	call	change_current_drive
  3135 0000B074 72D8                <1> 	jc	short csftdf_sf_error_retn
  3136                              <1> 
  3137                              <1> csftdf_sf_check_directory:
  3138 0000B076 BE[6D630100]        <1> 	mov	esi, SourceFile_Directory
  3139 0000B07B 803E20              <1> 	cmp	byte [esi], 20h
  3140 0000B07E 760F                <1> 	jna	short csftdf_find_sf
  3141                              <1> 
  3142                              <1> csftdf_sf_change_directory:
  3143 0000B080 FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  3144 0000B086 30E4                <1> 	xor	ah, ah ; CD_COMMAND sign -> 0 
  3145 0000B088 E815EEFFFF          <1> 	call	change_current_directory
  3146 0000B08D 72BF                <1> 	jc	short csftdf_sf_error_retn
  3147                              <1> 
  3148                              <1> ;csftdf_sf_change_prompt_dir_string:
  3149                              <1> ;	call	change_prompt_dir_string
  3150                              <1> 
  3151                              <1> csftdf_find_sf:
  3152 0000B08F BE[AE630100]        <1> 	mov	esi, SourceFile_Name
  3153 0000B094 66B80018            <1> 	mov	ax, 1800h ; Except volume label and dirs
  3154 0000B098 E84AD2FFFF          <1> 	call	find_first_file
  3155 0000B09D 72AF                <1> 	jc	short csftdf_sf_error_retn
  3156                              <1> 
  3157                              <1> csftdf_sf_ambgfn_check:
  3158 0000B09F 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3159 0000B0A2 7407                <1> 	jz	short csftdf_sf_found
  3160                              <1> 
  3161                              <1> csftdf_ambiguous_file_name_error:
  3162 0000B0A4 B802000000          <1> 	mov	eax, 2 ; File not found error
  3163 0000B0A9 F9                  <1> 	stc
  3164 0000B0AA C3                  <1> 	retn
  3165                              <1> 
  3166                              <1> csftdf_sf_found:
  3167 0000B0AB A3[98640100]        <1> 	mov	[csftdf_filesize], eax
  3168                              <1> 
  3169 0000B0B0 09C0                <1> 	or	eax, eax
  3170 0000B0B2 7507                <1> 	jnz	short csftdf_set_source_file_direntry
  3171                              <1> 
  3172                              <1> csftdf_sf_file_size_zero:
  3173 0000B0B4 B814000000          <1> 	mov	eax, 20 ; TRDOS zero length (file size) error
  3174 0000B0B9 F9                  <1> 	stc
  3175 0000B0BA C3                  <1> 	retn
  3176                              <1> 
  3177                              <1> csftdf_set_source_file_direntry:
  3178 0000B0BB BE[78620100]        <1> 	mov	esi, FindFile_DirEntry
  3179 0000B0C0 BF[BE630100]        <1> 	mov	edi, SourceFile_DirEntry
  3180 0000B0C5 B908000000          <1> 	mov	ecx, 8
  3181 0000B0CA F3A5                <1> 	rep	movsd
  3182                              <1> 
  3183                              <1> csftdf_sf_restore_cdrv:
  3184                              <1> 	; 22/03/2016
  3185 0000B0CC 8A15[97640100]      <1> 	mov	dl, [csftdf_cdrv]
  3186 0000B0D2 3A15[86590100]      <1> 	cmp	dl, [Current_Drv]
  3187 0000B0D8 7407                <1> 	je	short csftdf_sf_restore_cdir
  3188 0000B0DA E865BEFFFF          <1> 	call	change_current_drive 
  3189 0000B0DF 724F                <1> 	jc	short csftdf_df_error_retn ; 30/03/2016
  3190                              <1> 
  3191                              <1> csftdf_sf_restore_cdir:
  3192 0000B0E1 803D[620D0100]00    <1> 	cmp	byte [Restore_CDIR], 0
  3193 0000B0E8 7612                <1> 	jna	short csftdf_df_check_filename_exists
  3194 0000B0EA 29C0                <1> 	sub	eax, eax
  3195 0000B0EC BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3196 0000B0F1 88D4                <1> 	mov	ah, dl ; byte [csftdf_cdrv]
  3197 0000B0F3 01C6                <1> 	add	esi, eax
  3198 0000B0F5 E801BFFFFF          <1> 	call	restore_current_directory
  3199 0000B0FA 7234                <1> 	jc	short csftdf_df_error_retn
  3200                              <1>   
  3201                              <1> csftdf_df_check_filename_exists:
  3202 0000B0FC 803D[2E640100]20    <1> 	cmp	byte [DestinationFile_Name], 20h
  3203 0000B103 7716                <1> 	ja	short csftdf_check_df_cdrv
  3204                              <1> 
  3205                              <1> csftdf_copy_sf_name:
  3206 0000B105 BF[2E640100]        <1> 	mov	edi, DestinationFile_Name
  3207 0000B10A BE[AE630100]        <1> 	mov	esi, SourceFile_Name
  3208 0000B10F B10C                <1> 	mov	cl, 12
  3209                              <1> 
  3210                              <1> csftdf_df_copy_sf_name_loop:
  3211 0000B111 AC                  <1> 	lodsb
  3212 0000B112 AA                  <1> 	stosb
  3213 0000B113 08C0                <1> 	or	al, al
  3214 0000B115 7404                <1> 	jz	short csftdf_check_df_cdrv             
  3215 0000B117 FEC9                <1> 	dec	cl
  3216 0000B119 75F6                <1> 	jnz	csftdf_df_copy_sf_name_loop
  3217                              <1> 
  3218                              <1> csftdf_check_df_cdrv:
  3219 0000B11B 8A15[EC630100]      <1> 	mov	dl, [DestinationFile_Drv]
  3220 0000B121 3A15[86590100]      <1> 	cmp	dl, [Current_Drv]
  3221 0000B127 7408                <1> 	je	short csftdf_df_check_directory
  3222                              <1> 
  3223 0000B129 E816BEFFFF          <1> 	call	change_current_drive
  3224 0000B12E 7301                <1> 	jnc	short csftdf_df_check_directory
  3225                              <1> 
  3226                              <1> csftdf_df_error_retn:
  3227 0000B130 C3                  <1> 	retn
  3228                              <1> 
  3229                              <1> csftdf_df_check_directory:
  3230 0000B131 BE[ED630100]        <1> 	mov	esi, DestinationFile_Directory
  3231 0000B136 803E20              <1>         cmp     byte [esi], 20h
  3232 0000B139 760F                <1> 	jna	short csftdf_find_df
  3233                              <1> 
  3234                              <1> csftdf_df_change_directory:
  3235 0000B13B FE05[620D0100]      <1> 	inc	byte [Restore_CDIR]
  3236 0000B141 28E4                <1> 	sub	ah, ah ; CD_COMMAND sign -> 0 
  3237 0000B143 E85AEDFFFF          <1> 	call	change_current_directory
  3238 0000B148 72E6                <1> 	jc	short csftdf_df_error_retn
  3239                              <1> 
  3240                              <1> ;csftdf_df_change_prompt_dir_string:
  3241                              <1> ;	call	change_prompt_dir_string
  3242                              <1> 
  3243                              <1> csftdf_find_df:
  3244                              <1> 	; 23/03/2016
  3245 0000B14A 29DB                <1> 	sub	ebx, ebx
  3246 0000B14C 8A3D[EC630100]      <1> 	mov	bh,  [DestinationFile_Drv]
  3247 0000B152 81C300010900        <1> 	add	ebx, Logical_DOSDisks
  3248 0000B158 891D[C4640100]      <1> 	mov	[csftdf_df_drv_dt], ebx
  3249                              <1> 
  3250 0000B15E BE[2E640100]        <1> 	mov	esi, DestinationFile_Name
  3251 0000B163 6631C0              <1> 	xor	ax, ax 
  3252                              <1> 		; DestinationFile_AttributesMask -> any/zero
  3253 0000B166 E87CD1FFFF          <1> 	call	find_first_file
  3254 0000B16B 7218                <1> 	jc	short csftdf_df_check_error_code
  3255                              <1> 
  3256                              <1> csftdf_df_ambgfn_check:
  3257 0000B16D 6609D2              <1> 	or	dx, dx ; Ambiguous filename chars used sign (DX>0)
  3258 0000B170 752A                <1> 	jnz	short csftdf_df_error_inv_fname
  3259                              <1> 	
  3260                              <1> csftdf_df_found:
  3261 0000B172 C605[96640100]01    <1> 	mov	byte [DestinationFileFound], 1
  3262                              <1> 	; 17/10/2016 (cl -> bl)
  3263 0000B179 80E31F              <1> 	and	bl, 1Fh ; Attributes, D-V-S-H-R
  3264 0000B17C 745F                <1> 	jz	short csftdf_df_save_first_cluster
  3265                              <1> 
  3266                              <1> csftdf_df_permission_denied_retn:	 
  3267 0000B17E B805000000          <1> 	mov	eax, 05h ; Access/Permission denied.
  3268                              <1> csftdf_df_error_stc_retn:
  3269 0000B183 F9                  <1> 	stc
  3270 0000B184 C3                  <1> 	retn
  3271                              <1> 
  3272                              <1> csftdf_df_check_error_code:
  3273                              <1> 	;cmp	eax, 2
  3274 0000B185 3C02                <1> 	cmp	al, 2
  3275 0000B187 75FA                <1> 	jne	short csftdf_df_error_stc_retn
  3276                              <1> 
  3277 0000B189 C605[96640100]00    <1> 	mov	byte [DestinationFileFound], 0
  3278                              <1> 
  3279                              <1> 	; 15/10/2016
  3280 0000B190 BE[68620100]        <1> 	mov	esi, FindFile_Name ; *
  3281 0000B195 E80BD5FFFF          <1> 	call	check_filename
  3282 0000B19A 7307                <1> 	jnc	short csftdf_df_valid_fname
  3283                              <1> csftdf_df_error_inv_fname: ; 'invalid file name !'
  3284 0000B19C B81A000000          <1> 	mov 	eax, ERR_INV_FILE_NAME  ; 26
  3285 0000B1A1 F9                  <1> 	stc	
  3286 0000B1A2 C3                  <1> 	retn
  3287                              <1> 
  3288                              <1> csftdf_df_valid_fname:	
  3289                              <1> 	; 21/03/2016
  3290                              <1> 	; (Capitalized file name)
  3291                              <1> 	;mov	esi, FindFile_Name ; * ; 15/10/2016
  3292 0000B1A3 BF[2E640100]        <1> 	mov	edi, DestinationFile_Name
  3293 0000B1A8 A5                  <1> 	movsd
  3294 0000B1A9 A5                  <1> 	movsd	
  3295 0000B1AA A5                  <1> 	movsd
  3296                              <1> 	;movsb
  3297                              <1> 
  3298                              <1> csftdf_check_disk_free_size_0:
  3299 0000B1AB A1[DA630100]        <1> 	mov	eax, [SourceFile_DirEntry+DirEntry_FileSize]
  3300                              <1> 
  3301                              <1> csftdf_check_disk_free_size_1:
  3302                              <1> 	;sub	ebx, ebx
  3303                              <1> 	;mov 	esi, Logical_DOSDisks
  3304                              <1> 	;mov	bh,  [DestinationFile_Drv]
  3305                              <1> 	;add	esi, ebx
  3306                              <1> 	
  3307 0000B1B0 8B35[C4640100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 23/03/2016
  3308                              <1> 
  3309 0000B1B6 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec] ; 17, LD_BPB + 0Bh
  3310 0000B1BA 01C8                <1> 	add	eax, ecx
  3311 0000B1BC 48                  <1> 	dec	eax  ; file size (additional bytes) + 511 (round up)
  3312                              <1> csftdf_check_disk_free_size_3: ; 16/03/2016
  3313 0000B1BD 29D2                <1> 	sub	edx, edx
  3314 0000B1BF F7F1                <1> 	div	ecx ; bytes per sector
  3315                              <1> 
  3316                              <1> csftdf_check_disk_free_size:
  3317 0000B1C1 3B4674              <1> 	cmp	eax, [esi+LD_FreeSectors]
  3318 0000B1C4 0F8294000000        <1>         jb      csftdf_check_disk_free_size_ok
  3319 0000B1CA 770A                <1> 	ja	short csftdf_df_insufficient_disk_space
  3320                              <1> 
  3321 0000B1CC 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0 ; FS needs FDT sector also.
  3322 0000B1D0 0F8788000000        <1>         ja      csftdf_check_disk_free_size_ok 
  3323                              <1> 
  3324                              <1> csftdf_df_insufficient_disk_space:
  3325 0000B1D6 B827000000          <1> 	mov	eax, 27h ; insufficient disk space
  3326 0000B1DB EBA6                <1> 	jmp	short csftdf_df_error_stc_retn
  3327                              <1> 
  3328                              <1> csftdf_df_save_first_cluster:
  3329                              <1> 	; ESI = FindFile_DirEntry (for the old destination file)
  3330                              <1> 	; EAX = Old destination file size
  3331                              <1> 	; 24/03/2016
  3332                              <1> 	; EDI = Directory entry address (within Dir Buffer boundaries)
  3333 0000B1DD 81EF00000800        <1> 	sub	edi, Directory_Buffer  ; (<65536)
  3334 0000B1E3 66C1EF05            <1> 	shr	di, 5 ; Convert entry offset to entry index/number
  3335 0000B1E7 66893D[66640100]    <1> 	mov	[DestinationFile_DirEntryNumber], di ; (<2048)
  3336                              <1> 
  3337                              <1> csftdf_df_check_sf_df_fcluster:
  3338 0000B1EE 668B5614            <1> 	mov	dx, [esi+DirEntry_FstClusHI]
  3339 0000B1F2 C1E210              <1> 	shl	edx, 16
  3340 0000B1F5 668B561A            <1> 	mov	dx, [esi+DirEntry_FstClusLO]
  3341 0000B1F9 8915[A8640100]      <1> 	mov	[csftdf_df_cluster], edx
  3342                              <1> csftdf_df_check_sf_df_fcluster_1:
  3343 0000B1FF 668B15[D2630100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusHI]
  3344 0000B206 C1E210              <1> 	shl	edx, 16
  3345 0000B209 668B15[D8630100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusLO]
  3346 0000B210 3B15[A8640100]      <1> 	cmp	edx, [csftdf_df_cluster]
  3347 0000B216 7512                <1> 	jne	short csftdf_df_check_sf_df_fcluster_ok
  3348                              <1> csftdf_df_check_sf_df_drv:
  3349 0000B218 8A15[6C630100]      <1> 	mov	dl, [SourceFile_Drv]
  3350 0000B21E 3A15[EC630100]      <1> 	cmp	dl, [DestinationFile_Drv]
  3351 0000B224 7504                <1> 	jne	short csftdf_df_check_sf_df_fcluster_ok
  3352                              <1> 
  3353                              <1> 	; source and destination files are same !
  3354                              <1> 	; (they have same first cluster value on same logical disk)
  3355                              <1> 
  3356 0000B226 31C0                <1> 	xor	eax, eax ; mov eax, 0 -> Bad command or file name !
  3357 0000B228 F9                  <1> 	stc
  3358 0000B229 C3                  <1> 	retn 
  3359                              <1>    
  3360                              <1> csftdf_df_check_sf_df_fcluster_ok:
  3361                              <1> csftdf_df_move_findfile_struct:
  3362                              <1> 	; mov	esi, FindFile_DirEntry
  3363 0000B22A BF[3E640100]        <1> 	mov	edi, DestinationFile_DirEntry
  3364 0000B22F B908000000          <1> 	mov	ecx, 8
  3365 0000B234 F3A5                <1> 	rep	movsd
  3366                              <1> 	
  3367                              <1> csftdf_check_disk_free_size_2:
  3368 0000B236 89C2                <1> 	mov	edx, eax ; Old destination file size
  3369                              <1> 
  3370                              <1> 	;mov	eax, [SourceFile_DirEntry+DirEntry_FileSize]
  3371 0000B238 A1[98640100]        <1> 	mov	eax, [csftdf_filesize] ; 23/03/2016
  3372                              <1> 
  3373                              <1> 	;;sub	ecx, ecx ; 0
  3374                              <1> 	;mov 	esi, Logical_DOSDisks
  3375                              <1> 	;mov	ch,  [DestinationFile_Drv]
  3376                              <1> 	;add	esi, ecx
  3377                              <1> 	;
  3378                              <1> 	;mov	[csftdf_df_drv_dt], esi
  3379                              <1> 
  3380 0000B23D 8B35[C4640100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 23/03/2016
  3381                              <1> 
  3382 0000B243 668B4E11            <1> 	mov	cx, [esi+LD_BPB+BytesPerSec] ; 17, LD_BPB + 0Bh
  3383 0000B247 01CA                <1> 	add	edx, ecx ; + 512
  3384 0000B249 01C8                <1> 	add	eax, ecx ; + 512
  3385 0000B24B 4A                  <1> 	dec	edx ; old file size + 511 (round up)
  3386 0000B24C 48                  <1> 	dec	eax ; new file size + 511 (round up)
  3387 0000B24D F7D9                <1> 	neg	ecx ; -512 ; 0FFFFFE00h
  3388 0000B24F 21CA                <1> 	and	edx, ecx ; = old sector count * 512 
  3389 0000B251 21C8                <1> 	and	eax, ecx ; = new sector count * 512 
  3390                              <1> 
  3391 0000B253 29D0                <1> 	sub	eax, edx ; new file size - old file size (on disk)
  3392 0000B255 7607                <1> 	jna	short csftdf_check_disk_free_size_ok
  3393                              <1> 
  3394 0000B257 F7D9                <1> 	neg	ecx ; 512 (bytes per sector) ; 200h
  3395                              <1> 	; check free space for additional sectors
  3396                              <1> 	; eax = number of additional sectors * bytes per sector
  3397                              <1> 	; esi = Logical DOS drive number (of destination disk)
  3398 0000B259 E95FFFFFFF          <1>         jmp     csftdf_check_disk_free_size_3
  3399                              <1>  
  3400                              <1> csftdf_check_disk_free_size_ok:
  3401                              <1> 	; 18/03/2016
  3402                              <1> csftdf_df_check_copy_cmd_phase:
  3403 0000B25E A0[94640100]        <1> 	mov	al, [copy_cmd_phase]
  3404 0000B263 3C01                <1> 	cmp	al, 1
  3405 0000B265 7514                <1> 	jne	short csftdf2_check_cdrv
  3406                              <1> 	
  3407 0000B267 31C0                <1> 	xor	eax, eax
  3408 0000B269 A2[94640100]        <1> 	mov	[copy_cmd_phase], al ; 0
  3409                              <1> 
  3410 0000B26E 8A15[96640100]      <1> 	mov	dl, [DestinationFileFound]            
  3411 0000B274 8A35[C9630100]      <1> 	mov	dh, [SourceFile_DirEntry+11] ; Attributes
  3412                              <1>  
  3413                              <1> csftdf_return:	
  3414 0000B27A C3                  <1> 	retn
  3415                              <1> 
  3416                              <1> ; Phase 2
  3417                              <1> 
  3418                              <1> csftdf2_check_cdrv:
  3419                              <1> 	; 18/03/2016
  3420                              <1> 	; Here, destination drive and directory are ready !
  3421                              <1> 	; (checking/restoring is not needed)
  3422                              <1> 	; (Since at the end of the phase 1)
  3423                              <1> 
  3424                              <1> ;	mov	dl, [DestinationFile_Drv]
  3425                              <1> ;	cmp	dl, [Current_Drv]
  3426                              <1> ;	je	short csftdf2_df_check_directory
  3427                              <1> ;
  3428                              <1> ;	call	change_current_drive
  3429                              <1> ;	jc	short csftdf2_read_error
  3430                              <1> ;
  3431                              <1> ;csftdf2_df_check_directory:
  3432                              <1> ;	mov	esi, DestinationFile_Directory  
  3433                              <1> ;	cmp	byte [esi], 20h
  3434                              <1> ;	jna	short csftdf2_df_check_found_or_not
  3435                              <1> ;
  3436                              <1> ;csftdf2_df_change_directory:
  3437                              <1> ;	inc	byte [Restore_CDIR]
  3438                              <1> ;	xor	ah, ah ; CD_COMMAND sign -> 0 
  3439                              <1> ;	call	change_current_directory
  3440                              <1> ;	jc	short csftdf2_stc_return
  3441                              <1> ;
  3442                              <1> ;;csftdf2_df_change_prompt_dir_string:
  3443                              <1> ;;	call	change_prompt_dir_string
  3444                              <1> 
  3445                              <1> csftdf2_df_check_found_or_not:
  3446                              <1> 	; 21/03/2016
  3447 0000B27B 803D[96640100]00    <1> 	cmp	byte [DestinationFileFound], 0 
  3448 0000B282 7739                <1> 	ja	short csftdf2_set_sf_percentage
  3449                              <1> 
  3450                              <1> csftdf2_create_file:
  3451 0000B284 BE[2E640100]        <1> 	mov	esi, DestinationFile_Name
  3452 0000B289 A1[98640100]        <1> 	mov	eax, [csftdf_filesize]
  3453 0000B28E 30C9                <1> 	xor	cl, cl ; 0
  3454                              <1> 
  3455 0000B290 31DB                <1> 	xor	ebx, ebx ; 0
  3456 0000B292 4B                  <1> 	dec	ebx ; 0FFFFFFFFh 
  3457                              <1> 
  3458                              <1> 	; INPUT ->
  3459                              <1> 	; 	EAX -> File Size
  3460                              <1> 	; 	ESI = ASCIIZ File name
  3461                              <1> 	;	 CL = File attributes
  3462                              <1> 	;	EBX = FFFFFFFFh -> empty file sign for FAT fs
  3463                              <1> 	;	EBX <> FFFFFFFFh -> use file size for FAT fs 
  3464                              <1> 	;
  3465                              <1> 	; OUTPUT ->
  3466                              <1> 	;	EAX = New file's first cluster
  3467                              <1> 	;	ESI = Logical Dos Drv Descr. Table Addr.
  3468                              <1> 	;	EBX = CreateFile_Size address
  3469                              <1> 	;	ECX = Sectors per cluster (<256)
  3470                              <1> 	;	EDX = Directory Entry Index/Number (<65536)
  3471                              <1> 	;		
  3472                              <1> 	;	cf = 1 -> error code in AL (EAX)
  3473                              <1> 
  3474 0000B293 E8EC050000          <1> 	call	create_file
  3475                              <1> 	;pop	esi
  3476 0000B298 0F82A3050000        <1>         jc      csftdf2_rw_error
  3477                              <1> 
  3478                              <1> csftdf2_create_file_OK:
  3479 0000B29E A3[A8640100]        <1> 	mov	[csftdf_df_cluster], eax
  3480                              <1> 	
  3481                              <1> 	; 24/03/2016
  3482 0000B2A3 668915[66640100]    <1> 	mov	[DestinationFile_DirEntryNumber], dx 
  3483                              <1> 
  3484                              <1> 	; 21/03/2016
  3485 0000B2AA BE00000800          <1> 	mov	esi, Directory_Buffer
  3486 0000B2AF C1E205              <1> 	shl	edx, 5 ; 32 * index number
  3487 0000B2B2 01D6                <1> 	add	esi, edx
  3488 0000B2B4 BF[3E640100]        <1> 	mov	edi, DestinationFile_DirEntry	
  3489 0000B2B9 B108                <1> 	mov	cl, 8 ; 32 bytes
  3490 0000B2BB F3A5                <1> 	rep	movsd
  3491                              <1> 
  3492                              <1> csftdf2_set_sf_percentage:
  3493                              <1> 	; 17/03/2016
  3494 0000B2BD 31C0                <1> 	xor	eax, eax	
  3495 0000B2BF A2[BC640100]        <1> 	mov 	[csftdf_percentage], al ; 0, reset
  3496                              <1> 
  3497 0000B2C4 A3[B4640100]        <1> 	mov	[csftdf_sf_rbytes], eax ; 0, reset
  3498 0000B2C9 A3[B8640100]        <1> 	mov	[csftdf_df_wbytes], eax ; 0, reset
  3499                              <1> 
  3500 0000B2CE 8A25[6C630100]      <1> 	mov	ah, [SourceFile_Drv]	
  3501 0000B2D4 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  3502 0000B2D9 01C6                <1> 	add	esi, eax
  3503                              <1> 	
  3504 0000B2DB 8935[C0640100]      <1> 	mov	[csftdf_sf_drv_dt], esi ; 23/03/2016
  3505                              <1> 
  3506 0000B2E1 668B15[D2630100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusHI]
  3507 0000B2E8 C1E210              <1> 	shl	edx, 16
  3508 0000B2EB 668B15[D8630100]    <1> 	mov	dx, [SourceFile_DirEntry+DirEntry_FstClusLO]
  3509 0000B2F2 8915[A4640100]      <1> 	mov	[csftdf_sf_cluster], edx
  3510                              <1> 
  3511                              <1> 	; 16/03/2016
  3512                              <1> 	; Note: Singlix FS boot sector parameters (for cluster
  3513                              <1> 	;	related calculations) has same offset
  3514                              <1> 	;	values from LD_BPB as in FAT file system.
  3515                              <1> 	;	[esi+LD_BPB+SecPerClust] is 1 for Singlix FS.
  3516                              <1> 	;	
  3517 0000B2F8 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  3518 0000B2FC 880D[EA630100]      <1> 	mov	[SourceFile_SecPerClust], cl
  3519                              <1> 
  3520                              <1> 	; 17/03/2016
  3521 0000B302 386E03              <1> 	cmp	[esi+LD_FATType], ch ; 0
  3522 0000B305 7707                <1> 	ja	short csftdf2_set_sf_percent_rsize1
  3523                              <1> 
  3524 0000B307 B800000100          <1> 	mov	eax, 65536 ; read/write buffer size for Singlix FS
  3525 0000B30C EB06                <1> 	jmp	short csftdf2_set_sf_percent_rsize2	
  3526                              <1>  
  3527                              <1> csftdf2_set_sf_percent_rsize1:
  3528 0000B30E 668B4611            <1> 	mov	ax, [esi+LD_BPB+BytesPerSec]
  3529 0000B312 F7E1                <1> 	mul	ecx
  3530                              <1> 	;sub	edx, edx
  3531                              <1> csftdf2_set_sf_percent_rsize2:
  3532 0000B314 A3[AC640100]        <1> 	mov	[csftdf_r_size], eax
  3533                              <1> 
  3534                              <1> csftdf2_set_df_percentage:
  3535                              <1> 	;sub	eax, eax
  3536                              <1> 	;mov	ah, [DestinationFile_Drv]	
  3537                              <1> 	;mov	edi, Logical_DOSDisks
  3538                              <1> 	;add	edi, eax
  3539                              <1> 	;mov	[csftdf_df_drv_dt], edi ; 17/03/2016
  3540                              <1> 
  3541 0000B319 8B3D[C4640100]      <1> 	mov	edi, [csftdf_df_drv_dt] ; 23/03/2016
  3542                              <1> 
  3543                              <1> 	; 16/03/2016
  3544                              <1> 	; Note: Singlix FS boot sector parameters (for cluster
  3545                              <1> 	;	related calculations) has same offset
  3546                              <1> 	;	values from LD_BPB as in FAT file system.
  3547                              <1> 	;	[edi+LD_BPB+SecPerClust] is 1 for Singlix FS.
  3548                              <1> 	;	
  3549                              <1> 	;movzx	ecx, byte [edi+LD_BPB+SecPerClust]
  3550 0000B31F 8A4F13              <1> 	mov	cl, [edi+LD_BPB+SecPerClust]
  3551 0000B322 880D[6A640100]      <1> 	mov	[DestinationFile_SecPerClust], cl
  3552                              <1> 
  3553                              <1> 	; 17/03/2016
  3554 0000B328 386F03              <1> 	cmp	[edi+LD_FATType], ch ; 0
  3555 0000B32B 7707                <1> 	ja	short csftdf2_set_df_percent_wsize1
  3556                              <1> 	
  3557 0000B32D B800000100          <1> 	mov	eax, 65536 ; read/write buffer size for Singlix FS
  3558 0000B332 EB06                <1> 	jmp	short csftdf2_set_df_percent_wsize2	
  3559                              <1> 
  3560                              <1> csftdf2_set_df_percent_wsize1:
  3561 0000B334 0FB74711            <1> 	movzx	eax, word [edi+LD_BPB+BytesPerSec]
  3562 0000B338 F7E1                <1> 	mul	ecx
  3563                              <1> 	;sub	edx, edx
  3564                              <1> csftdf2_set_df_percent_wsize2:
  3565 0000B33A A3[B0640100]        <1> 	mov	[csftdf_w_size], eax
  3566                              <1> 
  3567 0000B33F A1[98640100]        <1> 	mov	eax, [csftdf_filesize]
  3568                              <1> 
  3569 0000B344 3D00000100          <1> 	cmp	eax, 65536 ; 64KB	; small file
  3570 0000B349 721F                <1> 	jb	short csftdf2_load_file ; do not display percentage
  3571                              <1> 	
  3572                              <1> csftdf2_reset_wf_percent_ptr_chk_64k:
  3573 0000B34B B201                <1> 	mov	dl, 1 ; 25/03/2016
  3574                              <1> 
  3575 0000B34D 3D00000400          <1> 	cmp	eax, 65536*4 ; 256KB
  3576 0000B352 7310                <1> 	jnb	short csftdf2_enable_percentage_display ; big file
  3577                              <1> 
  3578                              <1> 	; 64-128KB file size for floppy disks
  3579 0000B354 3815[6C630100]      <1> 	cmp	byte [SourceFile_Drv], dl ; 1 ; read from floppy disk ?
  3580 0000B35A 7608                <1> 	jna	short csftdf2_enable_percentage_display
  3581                              <1> 
  3582 0000B35C 3815[EC630100]      <1> 	cmp	byte [DestinationFile_Drv], dl ; 1 ; write to floppy disk ?
  3583 0000B362 7706                <1> 	ja	short csftdf2_load_file
  3584                              <1> 
  3585                              <1> csftdf2_enable_percentage_display:	
  3586 0000B364 8815[BC640100]      <1> 	mov	[csftdf_percentage], dl ; 1	
  3587                              <1> 	
  3588                              <1> csftdf2_load_file:
  3589                              <1> 	; 13/05/2016
  3590                              <1> 	; 19/03/2016
  3591                              <1> 	; 18/03/2016
  3592                              <1> 	; 17/03/2016
  3593 0000B36A B40F                <1> 	mov	ah, 0Fh
  3594 0000B36C E83261FFFF          <1> 	call	_int10h
  3595                              <1> 	; 13/05/2016
  3596 0000B371 883D[BD640100]      <1> 	mov	[csftdf_videopage], bh ; active video page
  3597 0000B377 B403                <1> 	mov	ah, 03h
  3598 0000B379 E82561FFFF          <1> 	call	_int10h
  3599 0000B37E 668915[BE640100]    <1> 	mov	[csftdf_cursorpos], dx
  3600                              <1> 
  3601 0000B385 29C0                <1> 	sub	eax, eax
  3602 0000B387 A2[95640100]        <1> 	mov	[csftdf_rw_err], al ; 0 
  3603                              <1> 
  3604                              <1> ; ///
  3605                              <1> csftdf_sf_amb: ; 15/03/2016
  3606 0000B38C 8B0D[98640100]      <1> 	mov	ecx, [csftdf_filesize]	; 23/03/2016
  3607                              <1> 
  3608                              <1> 	; TRDOS 386 (TRDOS v2.0)
  3609                              <1> 	; Allocate contiguous memory block for loading the file
  3610                              <1> 	
  3611                              <1> 	;mov	ecx, [SourceFile_DirEntry+DirEntry_FileSize]
  3612                              <1> 	
  3613                              <1> 	;sub	eax, eax ; First free memory aperture
  3614                              <1> 	
  3615                              <1> 	; eax = 0 (Allocate memory from the beginning)
  3616                              <1> 	; ecx = File (Allocation) size in bytes
  3617                              <1> 	
  3618 0000B392 E8EAA0FFFF          <1> 	call	allocate_memory_block
  3619 0000B397 7304                <1> 	jnc	short loc_check_sf_save_loading_parms
  3620                              <1> 
  3621 0000B399 29C0                <1> 	sub	eax, eax
  3622 0000B39B 29C9                <1> 	sub	ecx, ecx
  3623                              <1> 	
  3624                              <1> loc_check_sf_save_loading_parms:
  3625 0000B39D A3[9C640100]        <1> 	mov	[csftdf_sf_mem_addr], eax ; loading address
  3626 0000B3A2 890D[A0640100]      <1> 	mov	[csftdf_sf_mem_bsize], ecx ; block size
  3627                              <1> ; ///   
  3628                              <1> 	; 19/03/2016
  3629 0000B3A8 8B35[C0640100]      <1> 	mov	esi, [csftdf_sf_drv_dt] ; logical dos drv desc. tbl.
  3630                              <1> 
  3631                              <1> 	; 17/03/2016
  3632 0000B3AE 09C0                <1> 	or	eax, eax ; contiguous free memory block address 
  3633 0000B3B0 0F845B010000        <1>         jz      csftdf2_read_sf_cluster
  3634                              <1> 
  3635                              <1> 	; 18/03/2016
  3636 0000B3B6 8B1D[9C640100]      <1> 	mov	ebx, [csftdf_sf_mem_addr] ; memory block address
  3637                              <1> 
  3638 0000B3BC 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3639 0000B3C0 0F8605020000        <1>         jna     csftdf2_load_fs_file
  3640                              <1> 
  3641                              <1> csftdf2_load_fat_file:
  3642 0000B3C6 53                  <1> 	push	ebx ; *
  3643                              <1> 
  3644                              <1> csftdf2_load_fat_file_next:
  3645 0000B3C7 BE[B1130100]        <1> 	mov	esi, msg_reading
  3646 0000B3CC E8FCAFFFFF          <1> 	call	print_msg
  3647                              <1> 
  3648 0000B3D1 803D[BC640100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3649 0000B3D8 7605                <1> 	jna	short csftdf2_load_fat_file_1
  3650                              <1> 	
  3651 0000B3DA E87C000000          <1> 	call	csftdf2_print_percentage ; 19/03/2016
  3652                              <1> 
  3653                              <1> csftdf2_load_fat_file_1:
  3654 0000B3DF 8B35[C0640100]      <1> 	mov	esi, [csftdf_sf_drv_dt]	
  3655 0000B3E5 5B                  <1> 	pop	ebx ; *
  3656                              <1> 
  3657                              <1> csftdf2_load_fat_file_2:
  3658 0000B3E6 E8B8000000          <1> 	call	csftdf2_read_fat_file_sectors ; 19/03/2016
  3659 0000B3EB 0F8250040000        <1>         jc      csftdf2_rw_error ; eocc! or disk error! 
  3660                              <1> 
  3661 0000B3F1 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  3662 0000B3F3 7520                <1> 	jnz	short csftdf2_load_fat_file_ok
  3663                              <1> 
  3664 0000B3F5 803D[BC640100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3665 0000B3FC 76E8                <1> 	jna	short csftdf2_load_fat_file_2
  3666                              <1> 
  3667 0000B3FE 53                  <1> 	push	ebx ; *	
  3668                              <1> 
  3669                              <1> 	; Set cursor position
  3670                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  3671 0000B3FF 8A3D[BD640100]      <1> 	mov	bh, [csftdf_videopage]
  3672 0000B405 668B15[BE640100]    <1> 	mov	dx, [csftdf_cursorpos]
  3673 0000B40C B402                <1> 	mov	ah, 2
  3674 0000B40E E89060FFFF          <1> 	call	_int10h
  3675 0000B413 EBB2                <1> 	jmp	short csftdf2_load_fat_file_next
  3676                              <1> 	
  3677                              <1> csftdf2_load_fat_file_ok:
  3678 0000B415 803D[BC640100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3679 0000B41C 0F8651020000        <1>         jna     csftdf2_save_file ; 25/03/2016
  3680                              <1> 	
  3681                              <1> 	; "Reading... 100%"
  3682 0000B422 BF[C9130100]        <1> 	mov	edi, percentagestr
  3683 0000B427 B031                <1> 	mov	al, '1'
  3684 0000B429 AA                  <1> 	stosb
  3685 0000B42A B030                <1> 	mov	al, '0'
  3686 0000B42C AA                  <1> 	stosb
  3687 0000B42D AA                  <1> 	stosb
  3688                              <1> 
  3689 0000B42E 8A3D[BD640100]      <1> 	mov	bh, [csftdf_videopage]
  3690 0000B434 668B15[BE640100]    <1> 	mov	dx, [csftdf_cursorpos]
  3691 0000B43B B402                <1> 	mov	ah, 2
  3692 0000B43D E86160FFFF          <1> 	call	_int10h
  3693                              <1> 
  3694 0000B442 BE[B1130100]        <1> 	mov	esi, msg_reading
  3695 0000B447 E881AFFFFF          <1> 	call	print_msg
  3696                              <1> 	
  3697 0000B44C BE[C9130100]        <1> 	mov	esi, percentagestr
  3698 0000B451 E877AFFFFF          <1> 	call	print_msg
  3699                              <1> 
  3700 0000B456 E918020000          <1>         jmp     csftdf2_save_file ; 25/03/2016
  3701                              <1> 
  3702                              <1> csftdf2_print_percentage:
  3703                              <1> 	; 09/12/2017
  3704                              <1> 	; 19/03/2016
  3705                              <1> 	; 18/03/2016
  3706 0000B45B B020                <1> 	mov	al, 20h
  3707 0000B45D BF[C9130100]        <1> 	mov	edi, percentagestr
  3708 0000B462 AA                  <1> 	stosb
  3709 0000B463 AA                  <1> 	stosb
  3710 0000B464 A1[B4640100]        <1> 	mov	eax, [csftdf_sf_rbytes]
  3711 0000B469 BA64000000          <1> 	mov	edx, 100
  3712 0000B46E F7E2                <1> 	mul	edx
  3713 0000B470 8B0D[98640100]      <1> 	mov	ecx, [csftdf_filesize]	
  3714 0000B476 F7F1                <1> 	div	ecx
  3715 0000B478 B10A                <1> 	mov	cl, 10
  3716 0000B47A F6F1                <1> 	div	cl
  3717 0000B47C 80C430              <1> 	add	ah, '0'
  3718 0000B47F 8827                <1> 	mov	[edi], ah
  3719 0000B481 20C0                <1> 	and	al, al
  3720 0000B483 740A                <1> 	jz	short csftdf2_print_percent_1
  3721 0000B485 4F                  <1> 	dec	edi
  3722                              <1> 	;cbw
  3723 0000B486 28E4                <1> 	sub	ah, ah ; 09/12/2017
  3724 0000B488 F6F1                <1> 	div	cl
  3725 0000B48A 80C430              <1> 	add	ah, '0'
  3726 0000B48D 8827                <1> 	mov	[edi], ah
  3727                              <1> 	;and	al, al
  3728                              <1> 	;jz	short csftdf2_print_percent_1
  3729                              <1> 	;dec	edi
  3730                              <1> 	;mov	[edi], '1' ; 100%		
  3731                              <1> 
  3732                              <1> csftdf2_print_percent_1:
  3733 0000B48F BE[C9130100]        <1> 	mov	esi, percentagestr
  3734                              <1> 	;call	print_msg
  3735                              <1> 	;retn
  3736 0000B494 E934AFFFFF          <1> 	jmp	print_msg
  3737                              <1> 
  3738                              <1> csftdf2_read_file_sectors:
  3739                              <1> 	; 19/03/2016
  3740 0000B499 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3741 0000B49D 0F8627070000        <1>         jna     csftdf2_read_fs_file_sectors
  3742                              <1> 
  3743                              <1> csftdf2_read_fat_file_sectors:
  3744                              <1> 	; 19/03/2016
  3745                              <1> 	; 18/03/2016
  3746                              <1> 	; return:
  3747                              <1> 	;   CF = 0 & EDX > 0 -> END OF FILE
  3748                              <1> 	;   CF = 0 & EDX = 0 -> not EOF
  3749                              <1> 	;   CF = 1 -> read error (error code in AL)	
  3750                              <1> 
  3751                              <1> csftdf2_read_fat_file_secs_0:
  3752 0000B4A3 8B15[98640100]      <1> 	mov	edx, [csftdf_filesize]
  3753 0000B4A9 2B15[B4640100]      <1> 	sub	edx, [csftdf_sf_rbytes]
  3754 0000B4AF 3B15[AC640100]      <1> 	cmp	edx, [csftdf_r_size]	
  3755 0000B4B5 7306                <1> 	jnb	short csftdf2_read_fat_file_secs_1
  3756 0000B4B7 8915[AC640100]      <1> 	mov	[csftdf_r_size], edx
  3757                              <1> 		
  3758                              <1> csftdf2_read_fat_file_secs_1:
  3759 0000B4BD A1[AC640100]        <1> 	mov	eax, [csftdf_r_size]
  3760 0000B4C2 29D2                <1> 	sub	edx, edx
  3761 0000B4C4 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec]
  3762 0000B4C8 01C8                <1> 	add	eax, ecx
  3763 0000B4CA 48                  <1> 	dec	eax
  3764 0000B4CB F7F1                <1> 	div	ecx
  3765 0000B4CD 89C1                <1> 	mov	ecx, eax ; sector count
  3766 0000B4CF A1[A4640100]        <1> 	mov	eax, [csftdf_sf_cluster]
  3767                              <1> 
  3768                              <1> 	; EBX = memory block address (current)
  3769                              <1> 	
  3770 0000B4D4 E821090000          <1> 	call	read_fat_file_sectors
  3771 0000B4D9 7235                <1> 	jc	short csftdf2_read_fat_file_secs_3
  3772                              <1> 
  3773                              <1> 	; EBX = next memory address
  3774                              <1> 
  3775 0000B4DB A1[B4640100]        <1> 	mov	eax, [csftdf_sf_rbytes]
  3776 0000B4E0 0305[AC640100]      <1> 	add	eax, [csftdf_r_size]
  3777 0000B4E6 8B15[98640100]      <1> 	mov	edx, [csftdf_filesize]
  3778 0000B4EC 39D0                <1> 	cmp	eax, edx
  3779 0000B4EE 7320                <1> 	jnb	short csftdf2_read_fat_file_secs_3 ; edx > 0
  3780 0000B4F0 A3[B4640100]        <1> 	mov	[csftdf_sf_rbytes], eax
  3781                              <1> 
  3782 0000B4F5 53                  <1> 	push	ebx ; *
  3783                              <1> 	; get next cluster (csftdf_r_size! bytes)
  3784 0000B4F6 A1[A4640100]        <1> 	mov	eax, [csftdf_sf_cluster]
  3785 0000B4FB E8CC060000          <1> 	call	get_next_cluster
  3786 0000B500 5B                  <1> 	pop	ebx ; *
  3787 0000B501 7306                <1> 	jnc	short csftdf2_read_fat_file_secs_2
  3788                              <1> 
  3789                              <1> 	; 15/10/2016
  3790                              <1> 	;Disk read error instad of drv not ready err
  3791 0000B503 B811000000          <1> 	mov	eax, 17 ; Read error !
  3792 0000B508 C3                  <1> 	retn
  3793                              <1> 
  3794                              <1> csftdf2_read_fat_file_secs_2:
  3795 0000B509 29D2                <1> 	sub	edx, edx ; 0
  3796 0000B50B A3[A4640100]        <1> 	mov	[csftdf_sf_cluster], eax ; next cluster
  3797                              <1> 
  3798                              <1> csftdf2_read_fat_file_secs_3:
  3799 0000B510 C3                  <1> 	retn
  3800                              <1> 
  3801                              <1> csftdf2_read_sf_cluster:
  3802                              <1> 	; 19/03/2016
  3803 0000B511 BB00000700          <1> 	mov	ebx, Cluster_Buffer ; buffer address (64KB)
  3804                              <1> 
  3805 0000B516 803D[BC640100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3806 0000B51D 760D                <1> 	jna	short csftdf2_read_sf_clust_2
  3807                              <1> 
  3808 0000B51F 53                  <1> 	push	ebx ; *	
  3809                              <1> 
  3810                              <1> csftdf2_read_sf_clust_next:
  3811 0000B520 E836FFFFFF          <1> 	call	csftdf2_print_percentage
  3812                              <1> 
  3813                              <1> csftdf2_read_sf_clust_0:
  3814 0000B525 8B35[C0640100]      <1> 	mov	esi, [csftdf_sf_drv_dt]	
  3815                              <1> csftdf2_read_sf_clust_1:
  3816 0000B52B 5B                  <1> 	pop	ebx ; *
  3817                              <1> 
  3818                              <1> csftdf2_read_sf_clust_2:
  3819 0000B52C 89DA                <1> 	mov	edx, ebx
  3820 0000B52E 0315[AC640100]      <1> 	add	edx, [csftdf_r_size]
  3821 0000B534 81FA00000800        <1> 	cmp	edx, Cluster_Buffer + 65536
  3822 0000B53A 772F                <1> 	ja	short csftdf2_write_df_cluster
  3823                              <1> 
  3824 0000B53C E858FFFFFF          <1> 	call	csftdf2_read_file_sectors ; 19/03/2016
  3825 0000B541 0F8280020000        <1>         jc      csftdf2_save_fat_file_err2 ; eocc! or disk error! 
  3826                              <1> 
  3827 0000B547 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  3828 0000B549 7520                <1> 	jnz	short csftdf2_write_df_cluster
  3829                              <1> 
  3830 0000B54B 803D[BC640100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3831 0000B552 76D8                <1> 	jna	short csftdf2_read_sf_clust_2
  3832                              <1> 
  3833 0000B554 53                  <1> 	push	ebx ; *	
  3834                              <1> 
  3835                              <1> 	; Set cursor position
  3836                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  3837 0000B555 8A3D[BD640100]      <1> 	mov	bh, [csftdf_videopage]
  3838 0000B55B 668B15[BE640100]    <1> 	mov	dx, [csftdf_cursorpos]
  3839 0000B562 B402                <1> 	mov	ah, 2
  3840 0000B564 E83A5FFFFF          <1> 	call	_int10h
  3841 0000B569 EBB5                <1> 	jmp	short csftdf2_read_sf_clust_next
  3842                              <1> 
  3843                              <1> csftdf2_write_df_cluster:
  3844                              <1> 	; 19/03/2016
  3845 0000B56B 8B35[C4640100]      <1> 	mov	esi, [csftdf_df_drv_dt]	
  3846 0000B571 BB00000700          <1> 	mov	ebx, Cluster_Buffer ; buffer address (64KB)
  3847                              <1> 
  3848                              <1> csftdf2_write_df_clust_next:
  3849 0000B576 E855000000          <1> 	call	csftdf2_write_file_sectors ; 19/03/2016
  3850 0000B57B 0F8246020000        <1>         jc      csftdf2_save_fat_file_err2 ; eocc! or disk error! 
  3851                              <1> 
  3852 0000B581 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  3853 0000B583 750A                <1> 	jnz	short csftdf2_rw_f_clust_ok
  3854                              <1> 
  3855 0000B585 81FB00000800        <1> 	cmp	ebx, Cluster_Buffer + 65536
  3856 0000B58B 72E9                <1> 	jb	short csftdf2_write_df_clust_next
  3857                              <1> 	
  3858 0000B58D EB82                <1> 	jmp	short csftdf2_read_sf_cluster
  3859                              <1>  
  3860                              <1> csftdf2_rw_f_clust_ok:
  3861 0000B58F 803D[BC640100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3862 0000B596 0F86B2010000        <1>         jna     csftdf2_save_fat_file_4 ; 25/03/2016
  3863                              <1> 
  3864                              <1> 	; "100%"
  3865 0000B59C BF[C9130100]        <1> 	mov	edi, percentagestr
  3866 0000B5A1 B031                <1> 	mov	al, '1'
  3867 0000B5A3 AA                  <1> 	stosb
  3868 0000B5A4 B030                <1> 	mov	al, '0'
  3869 0000B5A6 AA                  <1> 	stosb
  3870 0000B5A7 AA                  <1> 	stosb
  3871                              <1> 
  3872 0000B5A8 8A3D[BD640100]      <1> 	mov	bh, [csftdf_videopage]
  3873 0000B5AE 668B15[BE640100]    <1> 	mov	dx, [csftdf_cursorpos]
  3874 0000B5B5 B402                <1> 	mov	ah, 2
  3875 0000B5B7 E8E75EFFFF          <1> 	call	_int10h
  3876                              <1> 
  3877 0000B5BC BE[C9130100]        <1> 	mov	esi, percentagestr
  3878 0000B5C1 E807AEFFFF          <1> 	call	print_msg
  3879                              <1> 
  3880 0000B5C6 E983010000          <1>         jmp     csftdf2_save_fat_file_4
  3881                              <1> 
  3882                              <1> csftdf2_load_fs_file:
  3883                              <1> 	; temporary - 18/03/2016
  3884 0000B5CB E96F020000          <1>         jmp     csftdf2_read_error
  3885                              <1> 
  3886                              <1> csftdf2_write_file_sectors:
  3887                              <1> 	; 19/03/2016
  3888 0000B5D0 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3889 0000B5D4 0F86F1050000        <1>         jna     csftdf2_write_fs_file_sectors
  3890                              <1> 
  3891                              <1> csftdf2_write_fat_file_sectors:
  3892                              <1> 	; 19/03/2016
  3893                              <1> 	; 18/03/2016
  3894                              <1> 	; return:
  3895                              <1> 	;   CF = 0 & EDX > 0 -> END OF FILE
  3896                              <1> 	;   CF = 0 & EDX = 0 -> not EOF
  3897                              <1> 	;   CF = 1 -> write error (error code in AL)	
  3898                              <1> 
  3899                              <1> csftdf2_write_fat_file_secs_0:
  3900 0000B5DA 8B15[98640100]      <1> 	mov	edx, [csftdf_filesize]
  3901 0000B5E0 2B15[B8640100]      <1> 	sub	edx, [csftdf_df_wbytes]
  3902 0000B5E6 3B15[B0640100]      <1> 	cmp	edx, [csftdf_w_size]	
  3903 0000B5EC 7306                <1> 	jnb	short csftdf2_write_fat_file_secs_1
  3904 0000B5EE 8915[B0640100]      <1> 	mov	[csftdf_w_size], edx		
  3905                              <1> 
  3906                              <1> csftdf2_write_fat_file_secs_1:
  3907 0000B5F4 A1[B0640100]        <1> 	mov	eax, [csftdf_w_size]
  3908 0000B5F9 29D2                <1> 	sub	edx, edx
  3909 0000B5FB 0FB74E11            <1> 	movzx	ecx, word [esi+LD_BPB+BytesPerSec]
  3910 0000B5FF 01C8                <1> 	add	eax, ecx
  3911 0000B601 48                  <1> 	dec	eax
  3912 0000B602 F7F1                <1> 	div	ecx
  3913 0000B604 89C1                <1> 	mov	ecx, eax ; sector count
  3914 0000B606 A1[A8640100]        <1> 	mov	eax, [csftdf_df_cluster]
  3915                              <1> 
  3916                              <1> 	; EBX = memory block address (current)	
  3917                              <1> 
  3918 0000B60B E8A20F0000          <1> 	call	write_fat_file_sectors
  3919 0000B610 7259                <1> 	jc	short csftdf2_write_fat_file_secs_4
  3920                              <1> 
  3921                              <1> 	; EBX = next memory address
  3922                              <1> 
  3923 0000B612 A1[B8640100]        <1> 	mov	eax, [csftdf_df_wbytes]
  3924 0000B617 0305[B0640100]      <1> 	add	eax, [csftdf_w_size]
  3925 0000B61D 8B15[98640100]      <1> 	mov	edx, [csftdf_filesize]
  3926 0000B623 39D0                <1> 	cmp	eax, edx
  3927 0000B625 7344                <1> 	jnb	short csftdf2_write_fat_file_secs_4
  3928 0000B627 A3[B8640100]        <1> 	mov	[csftdf_df_wbytes], eax
  3929                              <1> 	;
  3930 0000B62C A3[5A640100]        <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], eax
  3931                              <1> 
  3932 0000B631 53                  <1> 	push	ebx ; *
  3933                              <1> 
  3934 0000B632 803D[96640100]01    <1> 	cmp	byte [DestinationFileFound], 1
  3935 0000B639 7210                <1> 	jb	short csftdf2_write_fat_file_secs_2
  3936                              <1> 
  3937                              <1> 	; get next cluster (csftdf_w_size! bytes)
  3938 0000B63B A1[A8640100]        <1> 	mov	eax, [csftdf_df_cluster]
  3939 0000B640 E887050000          <1> 	call	get_next_cluster
  3940 0000B645 731C                <1> 	jnc	short csftdf2_write_fat_file_secs_3
  3941                              <1> 
  3942 0000B647 21C0                <1> 	and	eax, eax ; end of cluster chain!?
  3943 0000B649 7521                <1> 	jnz	short csftdf2_write_fat_file_secs_5 ; disk error !
  3944                              <1> 
  3945                              <1> csftdf2_write_fat_file_secs_2:
  3946 0000B64B A1[A8640100]        <1> 	mov	eax, [csftdf_df_cluster] ; last cluster
  3947 0000B650 E8800E0000          <1> 	call	add_new_cluster		
  3948 0000B655 7215                <1> 	jc	short csftdf2_write_fat_file_secs_5
  3949                              <1> 
  3950                              <1> 	; NOTE: Destination file size may be bigger than
  3951                              <1> 	; source file size when the last reading fails after here.
  3952                              <1> 	; (The last -empty- cluster of destination file must be 
  3953                              <1> 	; truncated and LMDT must be current date&time for partial
  3954                              <1> 	; copy result!) 
  3955 0000B657 8B15[B0640100]      <1> 	mov	edx, [csftdf_w_size] ; bytes per cluster
  3956 0000B65D 0115[5A640100]      <1> 	add	[DestinationFile_DirEntry+DirEntry_FileSize], edx
  3957                              <1> 
  3958                              <1> csftdf2_write_fat_file_secs_3:
  3959 0000B663 5B                  <1> 	pop	ebx ; *
  3960 0000B664 29D2                <1> 	sub	edx, edx ; 0
  3961 0000B666 A3[A8640100]        <1> 	mov	[csftdf_df_cluster], eax ; next cluster
  3962                              <1> 
  3963                              <1> csftdf2_write_fat_file_secs_4:
  3964 0000B66B C3                  <1> 	retn
  3965                              <1> 
  3966                              <1> csftdf2_write_fat_file_secs_5:
  3967 0000B66C 5B                  <1> 	pop	ebx ; *
  3968                              <1> 	; 16/10/2016 (1Dh -> 18)
  3969 0000B66D B812000000          <1> 	mov	eax, 18 ; Write error !
  3970 0000B672 C3                  <1> 	retn
  3971                              <1> 
  3972                              <1> csftdf2_save_file:
  3973                              <1> 	; 09/12/2017
  3974                              <1> 	; 25/03/2016
  3975                              <1> 	; 19/03/2016
  3976                              <1> 	; 18/03/2016
  3977 0000B673 8B35[C4640100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; logical dos drv desc. tbl.
  3978                              <1> 
  3979 0000B679 8B1D[9C640100]      <1> 	mov	ebx, [csftdf_sf_mem_addr] ; memory block address
  3980                              <1> 
  3981 0000B67F 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  3982 0000B683 0F86F4010000        <1>         jna     csftdf2_save_fs_file
  3983                              <1> 
  3984                              <1> csftdf2_save_fat_file:
  3985 0000B689 53                  <1> 	push	ebx; *
  3986                              <1> 
  3987 0000B68A 803D[BC640100]00    <1> 	cmp	byte [csftdf_percentage], 0
  3988 0000B691 7724                <1> 	ja	short csftdf2_save_fat_file_0
  3989                              <1> 
  3990                              <1> 	; Set cursor position
  3991                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  3992 0000B693 8A3D[BD640100]      <1> 	mov	bh, [csftdf_videopage]
  3993 0000B699 668B15[BE640100]    <1> 	mov	dx, [csftdf_cursorpos]
  3994 0000B6A0 B402                <1> 	mov	ah, 2
  3995 0000B6A2 E8FC5DFFFF          <1> 	call	_int10h
  3996                              <1> 	
  3997 0000B6A7 BE[BD130100]        <1> 	mov	esi, msg_writing
  3998 0000B6AC E81CADFFFF          <1> 	call	print_msg
  3999                              <1> 
  4000                              <1> csftdf2_save_fat_file_next:
  4001 0000B6B1 8B35[C4640100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 25/03/2016
  4002                              <1> 
  4003                              <1> csftdf2_save_fat_file_0:
  4004 0000B6B7 5B                  <1> 	pop	ebx ; *
  4005                              <1> 
  4006                              <1> csftdf2_save_fat_file_1:
  4007 0000B6B8 E813FFFFFF          <1> 	call	csftdf2_write_file_sectors ; 19/03/2016	
  4008 0000B6BD 0F827E010000        <1>         jc      csftdf2_rw_error ; eocc! or disk error! 
  4009                              <1> 
  4010 0000B6C3 09D2                <1> 	or	edx, edx ; edx > 0 -> EOF
  4011 0000B6C5 756D                <1>         jnz     short csftdf2_save_fat_file_3 ; 25/03/2016
  4012                              <1> 
  4013 0000B6C7 803D[BC640100]00    <1> 	cmp	byte [csftdf_percentage], 0
  4014 0000B6CE 76E8                <1> 	jna	short csftdf2_save_fat_file_1
  4015                              <1> 
  4016 0000B6D0 B020                <1> 	mov	al, 20h
  4017 0000B6D2 BF[C9130100]        <1> 	mov	edi, percentagestr
  4018 0000B6D7 AA                  <1> 	stosb
  4019 0000B6D8 AA                  <1> 	stosb
  4020 0000B6D9 A1[B8640100]        <1> 	mov	eax, [csftdf_df_wbytes]
  4021 0000B6DE BA64000000          <1> 	mov	edx, 100
  4022 0000B6E3 F7E2                <1> 	mul	edx
  4023 0000B6E5 8B0D[98640100]      <1> 	mov	ecx, [csftdf_filesize]	
  4024 0000B6EB F7F1                <1> 	div	ecx
  4025 0000B6ED B10A                <1> 	mov	cl, 10
  4026 0000B6EF F6F1                <1> 	div	cl
  4027 0000B6F1 80C430              <1> 	add	ah, '0'
  4028 0000B6F4 8827                <1> 	mov	[edi], ah
  4029 0000B6F6 20C0                <1> 	and	al, al
  4030 0000B6F8 740A                <1> 	jz	short csftdf2_save_fat_file_2
  4031 0000B6FA 4F                  <1> 	dec	edi
  4032                              <1> 	;cbw
  4033 0000B6FB 30E4                <1> 	xor	ah, ah ; 09/12/2017
  4034 0000B6FD F6F1                <1> 	div	cl
  4035 0000B6FF 80C430              <1> 	add	ah, '0'
  4036 0000B702 8827                <1> 	mov	[edi], ah
  4037                              <1> 	;and	al, al
  4038                              <1> 	;jz	short csftdf2_save_fat_file_2
  4039                              <1> 	;dec	edi
  4040                              <1> 	;mov	[edi], '1' ; 100%		
  4041                              <1> 
  4042                              <1> csftdf2_save_fat_file_2:
  4043 0000B704 53                  <1> 	push	ebx ; *
  4044                              <1> 
  4045 0000B705 E802000000          <1> 	call	csftdf2_print_wr_percentage ; 25/03/2016
  4046                              <1> 
  4047 0000B70A EBA5                <1>         jmp     csftdf2_save_fat_file_next
  4048                              <1> 
  4049                              <1> csftdf2_print_wr_percentage:
  4050                              <1> 	; Set cursor position
  4051                              <1> 	; AH= 02h, BH= Page Number, DH= Row, DL= Column
  4052 0000B70C 8A3D[BD640100]      <1> 	mov	bh, [csftdf_videopage]
  4053 0000B712 668B15[BE640100]    <1> 	mov	dx, [csftdf_cursorpos]
  4054 0000B719 B402                <1> 	mov	ah, 2
  4055 0000B71B E8835DFFFF          <1> 	call	_int10h
  4056                              <1> 
  4057 0000B720 BE[BD130100]        <1> 	mov	esi, msg_writing
  4058 0000B725 E8A3ACFFFF          <1> 	call	print_msg
  4059                              <1> 
  4060 0000B72A BE[C9130100]        <1> 	mov	esi, percentagestr
  4061                              <1> 	;call	print_msg
  4062                              <1> 	;retn
  4063 0000B72F E999ACFFFF          <1> 	jmp	print_msg
  4064                              <1> 
  4065                              <1> csftdf2_save_fat_file_3:
  4066 0000B734 803D[BC640100]00    <1> 	cmp	byte [csftdf_percentage], 0
  4067 0000B73B 7611                <1>         jna     csftdf2_save_fat_file_4 ; 25/03/2016
  4068                              <1> 
  4069                              <1> 	; "100%"
  4070 0000B73D BF[C9130100]        <1> 	mov	edi, percentagestr
  4071 0000B742 B031                <1> 	mov	al, '1'
  4072 0000B744 AA                  <1> 	stosb
  4073 0000B745 B030                <1> 	mov	al, '0'
  4074 0000B747 AA                  <1> 	stosb
  4075 0000B748 AA                  <1> 	stosb
  4076                              <1> 
  4077 0000B749 E8BEFFFFFF          <1> 	call	csftdf2_print_wr_percentage
  4078                              <1> 
  4079                              <1> csftdf2_save_fat_file_4:
  4080 0000B74E 803D[96640100]00    <1> 	cmp	byte [DestinationFileFound], 0
  4081 0000B755 7647                <1> 	jna	short csftdf2_save_fat_file_6
  4082                              <1> 
  4083 0000B757 8B35[C4640100]      <1> 	mov	esi, [csftdf_df_drv_dt] ; 31/03/2016	
  4084                              <1> 
  4085 0000B75D A1[A8640100]        <1> 	mov	eax, [csftdf_df_cluster] ; last cluster
  4086 0000B762 E865040000          <1> 	call	get_next_cluster
  4087 0000B767 7235                <1> 	jc	short csftdf2_save_fat_file_6 ; eocc! or disk error!
  4088                              <1> 
  4089 0000B769 A1[A8640100]        <1> 	mov	eax, [csftdf_df_cluster] ; last cluster
  4090                              <1> 	;xor	ecx, ecx
  4091                              <1> 	;mov	[FAT_ClusterCounter], ecx ; 0 ; reset
  4092                              <1> 	;dec	ecx ; 0FFFFFFFFh
  4093                              <1> 	;shr	ecx, 4 ; 28 bit ; 0FFFFFFFh
  4094 0000B76E B9FFFFFF0F          <1> 	mov	ecx, 0FFFFFFFh
  4095 0000B773 E87E070000          <1> 	call	update_cluster
  4096 0000B778 7224                <1> 	jc	short csftdf2_save_fat_file_6 ; really last cluster!?
  4097                              <1> 
  4098 0000B77A A3[A8640100]        <1> 	mov	[csftdf_df_cluster], eax ; next cluster
  4099                              <1> 	
  4100                              <1> 	; byte [FAT_BuffValidData] = 2 
  4101 0000B77F E82F0A0000          <1> 	call	save_fat_buffer
  4102 0000B784 730E                <1> 	jnc	short csftdf2_save_fat_file_5
  4103                              <1> 	
  4104 0000B786 8B15[98640100]      <1> 	mov	edx, [csftdf_filesize]
  4105 0000B78C 8915[5A640100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], edx
  4106 0000B792 EB58                <1> 	jmp	short csftdf2_save_fat_file_err3
  4107                              <1> 
  4108                              <1> csftdf2_save_fat_file_5:
  4109 0000B794 A1[A8640100]        <1> 	mov	eax, [csftdf_df_cluster]
  4110                              <1> 
  4111                              <1> 	; EAX = First cluster to be truncated/unlinked
  4112                              <1> 	; ESI = Logical dos drive description table address
  4113 0000B799 E8580C0000          <1> 	call	truncate_cluster_chain
  4114                              <1> 
  4115                              <1> csftdf2_save_fat_file_6:
  4116                              <1> 	; 28/03/2016
  4117 0000B79E BE[C9630100]        <1> 	mov	esi, SourceFile_DirEntry+DirEntry_Attr ; +11 to + 18
  4118 0000B7A3 BF[49640100]        <1> 	mov	edi, DestinationFile_DirEntry+DirEntry_Attr ; +11 to + 18
  4119 0000B7A8 A4                  <1> 	movsb ; +11
  4120 0000B7A9 A5                  <1> 	movsd ; +12 .. +15
  4121 0000B7AA 66A5                <1> 	movsw ; +16 .. +17
  4122                              <1> 		; + 18
  4123 0000B7AC 83C604              <1> 	add	esi, 4
  4124 0000B7AF 83C704              <1> 	add	edi, 4
  4125 0000B7B2 A5                  <1> 	movsd	; DirEntry_WrtTime ; +22 .. +25
  4126                              <1> 
  4127 0000B7B3 8B15[98640100]      <1> 	mov	edx, [csftdf_filesize]
  4128 0000B7B9 8915[5A640100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], edx
  4129                              <1> 
  4130 0000B7BF E8BAF0FFFF          <1> 	call	convert_current_date_time
  4131                              <1> 	; DX = Date in dos dir entry format
  4132                              <1> 	; AX = Time in dos dir entry format
  4133 0000B7C4 EB4D                <1> 	jmp	short csftdf2_save_fat_file_7
  4134                              <1> 
  4135                              <1> csftdf2_save_fat_file_err1:
  4136 0000B7C6 5B                  <1> 	pop	ebx ; *	
  4137                              <1> csftdf2_save_fat_file_err2:
  4138 0000B7C7 A1[B8640100]        <1> 	mov	eax, [csftdf_df_wbytes]
  4139 0000B7CC 8B15[5A640100]      <1> 	mov	edx, [DestinationFile_DirEntry+DirEntry_FileSize]
  4140 0000B7D2 39C2                <1> 	cmp	edx, eax
  4141 0000B7D4 7616                <1> 	jna	short csftdf2_save_fat_file_err3
  4142 0000B7D6 A1[A8640100]        <1> 	mov	eax, [csftdf_df_cluster] ; last (empty) cluster
  4143                              <1> 	; ESI = Logical dos drive description table address
  4144 0000B7DB E8160C0000          <1> 	call	truncate_cluster_chain
  4145 0000B7E0 720A                <1> 	jc	short csftdf2_save_fat_file_err3
  4146 0000B7E2 A1[B8640100]        <1> 	mov	eax, [csftdf_df_wbytes]	
  4147 0000B7E7 A3[5A640100]        <1> 	mov	[DestinationFile_DirEntry+DirEntry_FileSize], eax
  4148                              <1> csftdf2_save_fat_file_err3:
  4149 0000B7EC E88DF0FFFF          <1> 	call	convert_current_date_time
  4150                              <1> 	; DX = Date in dos dir entry format
  4151                              <1> 	; AX = Time in dos dir entry format
  4152 0000B7F1 C605[4B640100]00    <1> 	mov	byte [DestinationFile_DirEntry+DirEntry_CrtTimeTenth], 0
  4153 0000B7F8 66A3[4C640100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_CrtTime], ax
  4154 0000B7FE 668915[4E640100]    <1> 	mov	[DestinationFile_DirEntry+DirEntry_CrtDate], dx		
  4155 0000B805 66A3[54640100]      <1> 	mov	[DestinationFile_DirEntry+DirEntry_WrtTime], ax
  4156 0000B80B 668915[56640100]    <1> 	mov	[DestinationFile_DirEntry+DirEntry_WrtDate], dx
  4157 0000B812 F9                  <1> 	stc
  4158                              <1> csftdf2_save_fat_file_7:
  4159 0000B813 9C                  <1> 	pushf
  4160 0000B814 668915[50640100]    <1> 	mov	[DestinationFile_DirEntry+DirEntry_LastAccDate], dx
  4161 0000B81B BE[3E640100]        <1> 	mov	esi, DestinationFile_DirEntry
  4162 0000B820 BF00000800          <1> 	mov	edi, Directory_Buffer
  4163 0000B825 0FB70D[66640100]    <1> 	movzx	ecx, word [DestinationFile_DirEntryNumber] ; (<2048)
  4164 0000B82C 66C1E105            <1> 	shl	cx, 5 ; 32 * directory entry number
  4165 0000B830 01CF                <1> 	add	edi, ecx
  4166                              <1> 	;mov	ecx, 8
  4167 0000B832 66B90800            <1> 	mov	cx, 8
  4168 0000B836 F3A5                <1> 	rep	movsd
  4169 0000B838 9D                  <1> 	popf
  4170 0000B839 730B                <1> 	jnc	short csftdf2_write_file_OK
  4171                              <1> 	 		
  4172                              <1> csftdf2_write_error:
  4173                              <1> 	; 18/03/2016
  4174 0000B83B B01D                <1> 	mov	al, 1Dh ; write error
  4175 0000B83D EB02                <1> 	jmp	short csftdf2_rw_error
  4176                              <1> 
  4177                              <1> 	; 16/03/2016
  4178                              <1> csftdf2_read_error:
  4179 0000B83F B011                <1> 	mov	al, 17 ; ; Drive not ready or read error!
  4180                              <1> csftdf2_rw_error:
  4181 0000B841 A2[95640100]        <1> 	mov	[csftdf_rw_err], al 
  4182                              <1> 
  4183                              <1> csftdf2_write_file_OK:
  4184                              <1> 	; 18/03/2016
  4185 0000B846 C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  4186 0000B84D E8CAF0FFFF          <1> 	call	save_directory_buffer
  4187                              <1> 
  4188                              <1>  	; Update last modification date&time of destination
  4189                              <1> 	; file's (parent) directory
  4190 0000B852 E860F1FFFF          <1> 	call	update_parent_dir_lmdt
  4191                              <1> 	;
  4192 0000B857 A1[9C640100]        <1> 	mov	eax, [csftdf_sf_mem_addr] ; start address
  4193                              <1> 
  4194 0000B85C 21C0                <1> 	and	eax, eax
  4195 0000B85E 750E                <1> 	jnz	short csftdf2_dealloc_mblock
  4196                              <1> 
  4197 0000B860 88C5                <1> 	mov	ch, al ; 0 (Cluster r/w, not full loading)
  4198                              <1> csftdf2_dealloc_retn:
  4199 0000B862 8A0D[95640100]      <1> 	mov	cl, [csftdf_rw_err]
  4200 0000B868 A1[A8640100]        <1> 	mov	eax, [csftdf_df_cluster]
  4201 0000B86D C3                  <1> 	retn
  4202                              <1> 
  4203                              <1> csftdf2_dealloc_mblock:
  4204 0000B86E 8B0D[A0640100]      <1> 	mov	ecx, [csftdf_sf_mem_bsize] ; block size	
  4205 0000B874 E8159EFFFF          <1> 	call	deallocate_memory_block
  4206 0000B879 B5FF                <1>         mov     ch, 0FFh ; (File was full loaded at memory)
  4207 0000B87B EBE5                <1> 	jmp	short csftdf2_dealloc_retn
  4208                              <1> 
  4209                              <1> csftdf2_save_fs_file:
  4210                              <1> 	; 16/10/2016 (1Dh -> 18)
  4211                              <1> 	; temporary - (21/03/2016)
  4212 0000B87D B812000000          <1> 	mov	eax, 18 ; write error
  4213 0000B882 F9                  <1> 	stc
  4214 0000B883 C3                  <1> 	retn
  4215                              <1> 
  4216                              <1> create_file:
  4217                              <1> 	; 16/10/2016
  4218                              <1> 	; 24/03/2016, 31/03/2016
  4219                              <1> 	; 20/03/2016, 21/03/2016, 23/03/2016
  4220                              <1> 	; 19/03/2016 (TRDOS 396 = TRDOS v2.0)
  4221                              <1> 	; 03/09/2011 (FILE.ASM, 'proc_create_file')
  4222                              <1> 	; 09/08/2010
  4223                              <1> 	;
  4224                              <1> 	; INPUT ->
  4225                              <1> 	; 	EAX = File Size
  4226                              <1> 	; 	ESI = ASCIIZ File Name
  4227                              <1> 	; 	CL = File Attributes 
  4228                              <1> 	;	EBX = FFFFFFFFh -> create empty file 
  4229                              <1> 	;			 (only for FAT fs) 
  4230                              <1> 	; OUTPUT ->
  4231                              <1> 	;     CF = 0 ->
  4232                              <1> 	;	EAX = New file's first cluster
  4233                              <1> 	; 	ESI = Logical Dos Drv Descr. Table Addr.
  4234                              <1> 	; 	EBX = offset CreateFile_Size
  4235                              <1> 	; 	ECX = Sectors per cluster (<256) 
  4236                              <1> 	; 	EDX = Directory entry index/number (<65536)
  4237                              <1> 	;     CF = 1 -> error code in AL
  4238                              <1> 
  4239                              <1> ;	test	cl, 18h (directory or volume name)
  4240                              <1> ;	jnz	short loc_createfile_access_denied
  4241 0000B884 80E107              <1> 	and	cl, 07h ; S, H, R
  4242 0000B887 880D[E4640100]      <1>         mov     [createfile_attrib], cl 
  4243                              <1> 
  4244 0000B88D 89D9                <1> 	mov	ecx, ebx
  4245 0000B88F 89F3                <1> 	mov	ebx, esi ; ASCIIZ File Name address
  4246 0000B891 29D2                <1> 	sub	edx, edx
  4247 0000B893 8A35[86590100]      <1>         mov     dh, [Current_Drv]
  4248 0000B899 BE00010900          <1>         mov     esi, Logical_DOSDisks
  4249 0000B89E 01D6                <1> 	add	esi, edx
  4250                              <1> 
  4251 0000B8A0 8815[EF640100]      <1> 	mov	[createfile_UpdatePDir], dl ; 0 ; 31/03/2016 
  4252                              <1> 
  4253                              <1> 	; LD_DiskType = 0 for write protection (read only) 
  4254 0000B8A6 807E0101            <1> 	cmp	byte [esi+LD_DiskType], 1 ; 0 = Invalid
  4255 0000B8AA 730A                <1> 	jnb	short loc_createfile_check_file_sytem
  4256                              <1> 	; 16/10/2016 (TRDOS Error code: 30, disk write protected) 
  4257 0000B8AC B81E000000          <1> 	mov	eax, 30 ; 13h, MSDOS err : Disk write-protected 
  4258 0000B8B1 66BA0000            <1> 	mov	dx, 0
  4259                              <1> 	; err retn: EDX = 0, EBX = File name offset
  4260                              <1> 	; ESI -> Dos drive description table address	
  4261 0000B8B5 C3                  <1> 	retn
  4262                              <1> 
  4263                              <1> ;loc_createfile_access_denied:
  4264                              <1> ;	mov	eax, 05h ; access denied (invalid attributes input)
  4265                              <1> ;	stc
  4266                              <1> ;	retn
  4267                              <1> 
  4268                              <1> loc_createfile_check_file_sytem:
  4269 0000B8B6 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  4270 0000B8BA 730A                <1> 	jnb	short loc_createfile_chk_empty_FAT_file_sign1
  4271                              <1> 
  4272 0000B8BC A3[D0640100]        <1> 	mov	[createfile_size], eax
  4273                              <1> 	; ESI = Logical Dos Drive Description Table address
  4274                              <1> 	; EBX = ASCIIZ File Name address
  4275 0000B8C1 E9FE020000          <1> 	jmp	create_fs_file
  4276                              <1> 
  4277                              <1> loc_createfile_chk_empty_FAT_file_sign1:
  4278                              <1> 	; ECX = FFFFFFFFh -> create empty file if drive has FAT fs
  4279 0000B8C6 41                  <1> 	inc	ecx
  4280 0000B8C7 7506                <1> 	jnz	short loc_createfile_chk_empty_FAT_file_sign2
  4281 0000B8C9 890D[D0640100]      <1> 	mov	[createfile_size], ecx ; 0 ; empty file
  4282                              <1> 
  4283                              <1> loc_createfile_chk_empty_FAT_file_sign2:
  4284                              <1> 	; 23/03/2016
  4285 0000B8CF 668B4E11            <1> 	mov	cx, [esi+LD_BPB+BytesPerSec]
  4286 0000B8D3 66890D[EC640100]    <1> 	mov	[createfile_BytesPerSec], cx
  4287                              <1> 	
  4288                              <1> 	; EBX = ASCIIZ File Name address
  4289 0000B8DA 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+SecPerClust]
  4290 0000B8DE 8815[E5640100]      <1> 	mov	[createfile_SecPerClust], dl
  4291 0000B8E4 8B4E74              <1> 	mov	ecx, [esi+LD_FreeSectors]
  4292 0000B8E7 39D1                <1> 	cmp	ecx, edx ; byte [createfile_SecPerClust]
  4293 0000B8E9 7306                <1> 	jnb	short loc_create_fat_file
  4294                              <1> 	  
  4295                              <1> loc_createfile_insufficient_disk_space:
  4296 0000B8EB B827000000          <1> 	mov	eax, 27h
  4297                              <1> loc_createfile_gffc_retn:
  4298 0000B8F0 C3                  <1> 	retn
  4299                              <1> 
  4300                              <1> loc_create_fat_file:
  4301 0000B8F1 891D[C8640100]      <1> 	mov	[createfile_Name_Offset], ebx
  4302 0000B8F7 890D[CC640100]      <1> 	mov	[createfile_FreeSectors], ecx
  4303                              <1> 
  4304                              <1> loc_createfile_gffc_1:
  4305 0000B8FD E821050000          <1> 	call	get_first_free_cluster
  4306 0000B902 72EC                <1> 	jc	short loc_createfile_gffc_retn
  4307                              <1> 
  4308 0000B904 A3[D4640100]        <1> 	mov	[createfile_FFCluster], eax
  4309                              <1> 
  4310                              <1> loc_createfile_locate_ffe_on_directory:
  4311                              <1> 	; Current directory fcluster <> Directory buffer cluster
  4312                              <1> 	; Current directory will be reloaded by
  4313                              <1> 	; 'locate_current_dir_file' procedure
  4314                              <1> 	;
  4315                              <1> 	; ESI = Logical Dos Drv Desc. Table Adress
  4316 0000B909 56                  <1> 	push	esi ; *
  4317 0000B90A 31C0                <1> 	xor	eax, eax
  4318                              <1> 
  4319 0000B90C A3[A2600100]        <1> 	mov	dword [FAT_ClusterCounter], eax ; 0
  4320                              <1> 	; 21/03/2016
  4321 0000B911 A2[EE640100]        <1> 	mov	byte [createfile_wfc], al ; 0 
  4322                              <1> 
  4323 0000B916 89C1                <1>  	mov	ecx, eax
  4324 0000B918 6649                <1> 	dec	cx ; FFFFh  
  4325                              <1> 	; CX = FFFFh -> find first deleted or free entry
  4326                              <1> 	; ESI would be ASCIIZ filename address if the call
  4327                              <1> 	; would not be for first free or deleted dir entry  
  4328 0000B91A E8D7E7FFFF          <1> 	call	locate_current_dir_file
  4329 0000B91F 0F83EE000000        <1> 	jnc	loc_createfile_set_ff_dir_entry
  4330 0000B925 5E                  <1> 	pop	esi ; *
  4331                              <1> 	 ; ESI = Logical DOS Drv. Description Table Address 
  4332 0000B926 83F802              <1> 	cmp	eax, 2
  4333 0000B929 7402                <1> 	je	short loc_createfile_add_new_cluster
  4334                              <1> loc_createfile_locate_file_stc_retn:
  4335 0000B92B F9                  <1> 	stc
  4336 0000B92C C3                  <1> 	retn
  4337                              <1> 
  4338                              <1> loc_createfile_add_new_cluster:
  4339 0000B92D 803D[85590100]02    <1> 	cmp	byte [Current_FATType], 2
  4340                              <1> 	;cmp	byte [esi+LD_FATType], 2
  4341 0000B934 770C                <1> 	ja	short loc_createfile_add_new_cluster_check_fsc
  4342 0000B936 803D[84590100]01    <1> 	cmp	byte [Current_Dir_Level], 1
  4343                              <1> 	;cmp	byte [esi+LD_CDirLevel], 1
  4344 0000B93D 7303                <1> 	jnb	short loc_createfile_add_new_cluster_check_fsc
  4345                              <1> 	
  4346                              <1> 	;mov	eax, 12
  4347 0000B93F B00C                <1> 	mov	al, 12 ; No more files 
  4348                              <1> 
  4349                              <1> loc_createfile_anc_retn:
  4350 0000B941 C3                  <1> 	retn
  4351                              <1> 
  4352                              <1> loc_createfile_add_new_cluster_check_fsc:
  4353 0000B942 8B0D[CC640100]      <1> 	mov	ecx, [createfile_FreeSectors]
  4354 0000B948 0FB605[E5640100]    <1> 	movzx	eax, byte [createfile_SecPerClust]
  4355 0000B94F 66D1E0              <1> 	shl	ax, 1 ; AX = 2 * AX
  4356 0000B952 39C1                <1> 	cmp	ecx, eax
  4357 0000B954 7295                <1>         jb	short loc_createfile_insufficient_disk_space
  4358                              <1> 
  4359                              <1> loc_createfile_add_new_subdir_cluster:
  4360 0000B956 8B15[B1600100]      <1> 	mov	edx, [DirBuff_Cluster]
  4361 0000B95C 8915[D8640100]      <1> 	mov	[createfile_LastDirCluster], edx	
  4362                              <1> 
  4363 0000B962 A1[D4640100]        <1> 	mov	eax, [createfile_FFCluster]
  4364 0000B967 E846040000          <1> 	call	load_FAT_sub_directory 
  4365 0000B96C 72D3                <1> 	jc	short loc_createfile_anc_retn
  4366                              <1> 
  4367                              <1> pass_createfile_add_new_subdir_cluster:
  4368                              <1> 	;movzx	eax, word [esi+LD_BPB+BytesPerSec]
  4369 0000B96E 0FB705[EC640100]    <1> 	movzx	eax, word [createfile_BytesPerSec] ; 23/03/2016
  4370 0000B975 F7E1                <1> 	mul	ecx ; ecx = directory buffer sector count
  4371 0000B977 89C1                <1> 	mov	ecx, eax
  4372 0000B979 C1E902              <1> 	shr	ecx, 2 ; dword count
  4373 0000B97C 29C0                <1> 	sub	eax, eax ; 0
  4374 0000B97E F3AB                <1> 	rep	stosd 
  4375                              <1> 	;
  4376 0000B980 C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2 
  4377 0000B987 E890EFFFFF          <1> 	call	save_directory_buffer
  4378 0000B98C 72B3                <1> 	jc	short loc_createfile_anc_retn
  4379                              <1> 
  4380                              <1> loc_createfile_save_added_subdir_cluster:
  4381 0000B98E A1[D8640100]        <1> 	mov	eax, [createfile_LastDirCluster]
  4382 0000B993 8B0D[D4640100]      <1> 	mov	ecx, [createfile_FFCluster]
  4383 0000B999 E858050000          <1> 	call	update_cluster
  4384 0000B99E 7304                <1> 	jnc	short loc_createfile_save_fat_buffer_0
  4385 0000B9A0 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  4386 0000B9A2 751A                <1> 	jnz	short loc_createfile_save_fat_buffer_stc_retn
  4387                              <1> 
  4388                              <1> loc_createfile_save_fat_buffer_0:
  4389 0000B9A4 A1[D4640100]        <1> 	mov	eax, [createfile_FFCluster]
  4390 0000B9A9 A3[D8640100]        <1> 	mov	[createfile_LastDirCluster], eax
  4391 0000B9AE B9FFFFFF0F          <1> 	mov	ecx, 0FFFFFFFh ; 28 bit
  4392 0000B9B3 E83E050000          <1> 	call	update_cluster
  4393 0000B9B8 7306                <1> 	jnc	short loc_createfile_save_fat_buffer_1
  4394 0000B9BA 09C0                <1> 	or	eax, eax ; Was it free cluster
  4395 0000B9BC 7402                <1> 	jz	short loc_createfile_save_fat_buffer_1
  4396                              <1> 
  4397                              <1> loc_createfile_save_fat_buffer_stc_retn:
  4398 0000B9BE F9                  <1> 	stc
  4399                              <1> loc_createfile_save_fat_buffer_retn:
  4400                              <1> loc_createfile_gffc_2_stc_retn:
  4401 0000B9BF C3                  <1> 	retn
  4402                              <1> 
  4403                              <1> loc_createfile_save_fat_buffer_1:
  4404                              <1> 	; byte [FAT_BuffValidData] = 2 
  4405 0000B9C0 E8EE070000          <1> 	call	save_fat_buffer
  4406 0000B9C5 72F8                <1> 	jc	short loc_createfile_save_fat_buffer_retn
  4407                              <1> 
  4408 0000B9C7 803D[A2600100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  4409 0000B9CE 7222                <1> 	jb	short loc_createfile_save_fat_buffer_2
  4410                              <1> 
  4411                              <1> 	; ESI = Logical DOS Drive Description Table address 
  4412 0000B9D0 A1[A2600100]        <1> 	mov	eax, [FAT_ClusterCounter]
  4413                              <1> 
  4414 0000B9D5 C605[A2600100]00    <1> 	mov	byte [FAT_ClusterCounter], 0 ; 21/03/2016
  4415                              <1> 
  4416 0000B9DC 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  4417 0000B9E0 E863080000          <1> 	call	calculate_fat_freespace
  4418                              <1> 
  4419                              <1> 	;inc	eax ; 0FFFFFFFFh -> 0 ; recalculation is needed!
  4420                              <1> 	;jnz	short loc_createfile_save_fat_buffer_2
  4421                              <1> 
  4422                              <1> 	; ecx > 0 -> Recalculation is needed
  4423 0000B9E5 09C9                <1> 	or	ecx, ecx 
  4424 0000B9E7 7409                <1> 	jz	short loc_createfile_save_fat_buffer_2
  4425                              <1> 
  4426 0000B9E9 66BB00FF            <1> 	mov	bx, 0FF00h ; ; recalculate free space
  4427 0000B9ED E856080000          <1> 	call	calculate_fat_freespace
  4428                              <1> 
  4429                              <1> loc_createfile_save_fat_buffer_2:
  4430                              <1> 	;call	update_parent_dir_lmdt
  4431                              <1> 
  4432                              <1> loc_createfile_gffc_2:
  4433 0000B9F2 E82C040000          <1> 	call	get_first_free_cluster
  4434 0000B9F7 72C6                <1> 	jc	short loc_createfile_gffc_2_stc_retn
  4435                              <1> 
  4436 0000B9F9 A3[D4640100]        <1> 	mov	[createfile_FFCluster], eax
  4437                              <1> 
  4438 0000B9FE A1[D8640100]        <1> 	mov	eax, [createfile_LastDirCluster]
  4439                              <1> 	
  4440 0000BA03 E8AA030000          <1> 	call	load_FAT_sub_directory 
  4441 0000BA08 72B5                <1> 	jc	short loc_createfile_gffc_2_stc_retn
  4442                              <1> 
  4443 0000BA0A BF00000800          <1> 	mov	edi, Directory_Buffer
  4444                              <1> 
  4445 0000BA0F 6629DB              <1> 	sub	bx, bx ; directory entry index/number = 0
  4446                              <1> 
  4447 0000BA12 56                  <1> 	push	esi ; * ; 23/03/2016
  4448                              <1> 
  4449                              <1> loc_createfile_set_ff_dir_entry:
  4450 0000BA13 66891D[E6640100]    <1> 	mov	[createfile_DirIndex], bx
  4451                              <1> 
  4452                              <1>         ; EDI = Directory entry address
  4453 0000BA1A 8B35[C8640100]      <1> 	mov	esi, [createfile_Name_Offset]
  4454 0000BA20 A1[D4640100]        <1> 	mov	eax, [createfile_FFCluster]
  4455 0000BA25 A3[DC640100]        <1> 	mov	[createfile_Cluster], eax ; 24/03/2016
  4456 0000BA2A B5FF                <1> 	mov	ch, 0FFh
  4457 0000BA2C 8A0D[E4640100]      <1>         mov	cl, [createfile_attrib] ; file attributes
  4458                              <1> 	; CH > 0 -> File size is in [EBX]
  4459 0000BA32 BB[D0640100]        <1> 	mov	ebx, createfile_size
  4460                              <1>   
  4461 0000BA37 E803EEFFFF          <1> 	call	make_directory_entry
  4462                              <1> 	
  4463 0000BA3C 5E                  <1> 	pop	esi ; * ; ESI = Logical Dos Drv Desc. Table address
  4464                              <1> 
  4465 0000BA3D C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2 
  4466 0000BA44 E8D3EEFFFF          <1> 	call	save_directory_buffer
  4467 0000BA49 7221                <1> 	jc	short loc_createfile_set_ff_dir_entry_retn
  4468                              <1> 
  4469 0000BA4B C605[EF640100]01    <1> 	mov	byte [createfile_UpdatePDir], 1 ; 31/03/2016 
  4470                              <1> 
  4471                              <1> loc_createfile_get_set_write_file_cluster:
  4472 0000BA52 A1[D0640100]        <1> 	mov	eax, [createfile_size]
  4473 0000BA57 09C0                <1> 	or	eax, eax
  4474 0000BA59 7570                <1> 	jnz	short loc_createfile_get_set_wfc_cont
  4475 0000BA5B 40                  <1> 	inc	eax
  4476                              <1> 	; 23/03/2016
  4477 0000BA5C 0FB61D[E5640100]    <1> 	movzx	ebx, byte [createfile_SecPerClust]
  4478                              <1> 	;movzx	ecx, word [esi+LD_BPB+BytesPerSec] ; 512
  4479 0000BA63 0FB70D[EC640100]    <1>         movzx   ecx, word [createfile_BytesPerSec] ; 512
  4480 0000BA6A EB7C                <1> 	jmp	loc_createfile_set_cluster_count 
  4481                              <1> 
  4482                              <1> loc_createfile_set_ff_dir_entry_retn:
  4483 0000BA6C C3                  <1> 	retn
  4484                              <1> 
  4485                              <1> loc_createfile_write_fcluster_to_disk:
  4486 0000BA6D 034668              <1> 	add	eax, [esi+LD_DATABegin] ; convert to physical address
  4487 0000BA70 BB00000700          <1> 	mov	ebx, Cluster_Buffer
  4488                              <1> 	; ESI = Logical DOS Drv. Desc. Tbl. address
  4489                              <1> 	; EAX = Disk address
  4490                              <1> 	; EBX = Sector Buffer
  4491                              <1> 	; ECX = sectors per cluster
  4492 0000BA75 E8D33D0000          <1> 	call	disk_write
  4493 0000BA7A 7211                <1> 	jc	short loc_createfile_dsk_wr_err
  4494                              <1> 
  4495                              <1> loc_createfile_update_fat_cluster:
  4496                              <1> 	; 21/03/2016	
  4497 0000BA7C 803D[EE640100]00    <1> 	cmp	byte [createfile_wfc], 0 
  4498 0000BA83 7712                <1> 	ja	short loc_createfile_update_fat_cluster_n1
  4499                              <1> 
  4500 0000BA85 FE05[EE640100]      <1> 	inc	byte [createfile_wfc] ; 1
  4501 0000BA8B EB24                <1> 	jmp	short loc_createfile_update_fat_cluster_n2
  4502                              <1> 
  4503                              <1> loc_createfile_dsk_wr_err:
  4504                              <1> 	; 16/10/2016 (1Dh -> 18)
  4505                              <1> 	; 23/03/2016
  4506 0000BA8D B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error !
  4507 0000BA92 E9BD000000          <1> 	jmp	loc_createfile_stc_retn
  4508                              <1> 
  4509                              <1> loc_createfile_update_fat_cluster_n1:
  4510 0000BA97 A1[E0640100]        <1> 	mov	eax, [createfile_PCluster]
  4511 0000BA9C 8B0D[DC640100]      <1> 	mov	ecx, [createfile_Cluster]
  4512 0000BAA2 E84F040000          <1> 	call	update_cluster
  4513 0000BAA7 7308                <1> 	jnc	short loc_createfile_update_fat_cluster_n2
  4514 0000BAA9 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  4515 0000BAAB 0F85A3000000        <1> 	jnz	loc_createfile_stc_retn
  4516                              <1> 
  4517                              <1> loc_createfile_update_fat_cluster_n2:
  4518 0000BAB1 A1[DC640100]        <1>         mov	eax, [createfile_Cluster]
  4519 0000BAB6 B9FFFFFF0F          <1> 	mov	ecx, 0FFFFFFFh
  4520 0000BABB E836040000          <1> 	call	update_cluster
  4521 0000BAC0 734E                <1> 	jnc	short loc_createfile_save_fat_buffer_3
  4522 0000BAC2 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  4523 0000BAC4 744A                <1> 	jz	short loc_createfile_save_fat_buffer_3
  4524                              <1> 
  4525                              <1> loc_createfile_upd_fat_fcluster_stc_retn:
  4526 0000BAC6 E989000000          <1> 	jmp	loc_createfile_stc_retn
  4527                              <1> 
  4528                              <1> loc_createfile_get_set_wfc_cont:
  4529                              <1> 	;movzx	ecx, word [esi+LD_BPB+BytesPerSec] ; 512	
  4530 0000BACB 0FB70D[EC640100]    <1> 	movzx	ecx, word [createfile_BytesPerSec] ; 512
  4531 0000BAD2 01C8                <1> 	add	eax, ecx
  4532 0000BAD4 48                  <1> 	dec	eax  ; add eax, 511
  4533 0000BAD5 29D2                <1> 	sub	edx, edx
  4534 0000BAD7 F7F1                <1> 	div	ecx
  4535 0000BAD9 0FB61D[E5640100]    <1> 	movzx	ebx, byte [createfile_SecPerClust]
  4536 0000BAE0 01D8                <1> 	add	eax, ebx
  4537 0000BAE2 48                  <1> 	dec	eax  ; add eax, SecPerClust - 1
  4538 0000BAE3 6631D2              <1> 	xor	dx, dx
  4539 0000BAE6 F7F3                <1> 	div	ebx
  4540                              <1> 
  4541                              <1> loc_createfile_set_cluster_count:
  4542 0000BAE8 A3[E8640100]        <1> 	mov 	[createfile_CCount], eax
  4543                              <1> 	
  4544 0000BAED BF00000700          <1> 	mov	edi, Cluster_Buffer
  4545 0000BAF2 89C8                <1> 	mov	eax, ecx ; Bytes per Sector
  4546 0000BAF4 F7E3                <1> 	mul	ebx ; Sectors per Cluster 
  4547                              <1> 	; EAX = Bytes per Cluster
  4548 0000BAF6 89C1                <1> 	mov	ecx, eax
  4549 0000BAF8 C1E902              <1> 	shr	ecx, 2 ; dword count
  4550 0000BAFB 31C0                <1> 	xor	eax, eax
  4551 0000BAFD F3AB                <1> 	rep	stosd ; clear cluster buffer
  4552                              <1> 
  4553 0000BAFF A1[DC640100]        <1> 	mov	eax, [createfile_Cluster] ; 24/03/2016
  4554                              <1> 
  4555 0000BB04 89D9                <1> 	mov	ecx, ebx
  4556                              <1> 
  4557                              <1> loc_createfile_get_set_wf_fclust_cont:
  4558 0000BB06 83E802              <1> 	sub	eax, 2
  4559 0000BB09 F7E1                <1> 	mul	ecx
  4560                              <1> 	; EAX = Logical DOS disk address (offset)
  4561 0000BB0B E95DFFFFFF          <1>         jmp     loc_createfile_write_fcluster_to_disk
  4562                              <1> 
  4563                              <1> loc_createfile_save_fat_buffer_3:
  4564                              <1> 	; byte [FAT_BuffValidData] = 2
  4565 0000BB10 E89E060000          <1> 	call	save_fat_buffer
  4566 0000BB15 723D                <1> 	jc	loc_createfile_stc_retn
  4567                              <1> 
  4568                              <1> 	; 21/03/2016
  4569 0000BB17 803D[A2600100]01    <1> 	cmp	byte [FAT_ClusterCounter], 1
  4570 0000BB1E 721B                <1> 	jb	short loc_createfile_save_fat_buffer_4
  4571                              <1> 
  4572                              <1> 	; ESI = Logical DOS Drive Description Table address 
  4573 0000BB20 A1[A2600100]        <1> 	mov	eax, [FAT_ClusterCounter]
  4574 0000BB25 66BB01FF            <1> 	mov	bx, 0FF01h ; add free clusters 
  4575 0000BB29 E81A070000          <1> 	call	calculate_fat_freespace
  4576                              <1> 
  4577                              <1> 	;inc	eax ; 0FFFFFFFFh -> 0 ; recalculation is needed!
  4578                              <1> 	;jnz	short loc_createfile_save_fat_buffer_4
  4579                              <1> 
  4580                              <1> 	; ecx > 0 -> Recalculation is needed
  4581 0000BB2E 09C9                <1> 	or	ecx, ecx 
  4582 0000BB30 7409                <1> 	jz	short loc_createfile_save_fat_buffer_4
  4583                              <1> 
  4584 0000BB32 66BB00FF            <1> 	mov	bx, 0FF00h ; ; recalculate free space
  4585 0000BB36 E80D070000          <1> 	call	calculate_fat_freespace
  4586                              <1> 
  4587                              <1> loc_createfile_save_fat_buffer_4:
  4588 0000BB3B FF0D[E8640100]      <1> 	dec	dword [createfile_CCount]
  4589                              <1> 	;jz	short loc_createfile_upd_dir_modif_date_time
  4590 0000BB41 743F                <1> 	jz	short loc_createfile_stc_retn_cc ; 31/03/2016
  4591                              <1> 
  4592                              <1> loc_createfile_get_set_write_next_cluster:
  4593 0000BB43 E8DB020000          <1> 	call	get_first_free_cluster
  4594 0000BB48 720A                <1> 	jc	short loc_createfile_stc_retn
  4595                              <1> 
  4596                              <1> loc_createfile_get_set_write_next_cluster_1:
  4597 0000BB4A 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh
  4598 0000BB4D 7213                <1> 	jb	short loc_createfile_get_set_write_next_cluster_2
  4599                              <1> 
  4600                              <1> loc_createfile_wnc_insufficient_disk_space:	
  4601 0000BB4F B827000000          <1> 	mov	eax, 27h ; Insufficient disk space
  4602                              <1> 
  4603                              <1> loc_createfile_stc_retn:
  4604 0000BB54 803D[EE640100]01    <1> 	cmp	byte [createfile_wfc], 1
  4605 0000BB5B 7324                <1> 	jnb	short loc_createfile_err_retn
  4606 0000BB5D C3                  <1> 	retn
  4607                              <1> 
  4608                              <1> loc_createfile_wnc_inv_format_retn:
  4609                              <1> 	;mov	eax, 28
  4610 0000BB5E B01C                <1> 	mov	al, 28 ; Invalid format
  4611 0000BB60 EBF2                <1> 	jmp	short loc_createfile_stc_retn
  4612                              <1> 	         
  4613                              <1> loc_createfile_get_set_write_next_cluster_2:
  4614 0000BB62 83F802              <1> 	cmp	eax, 2
  4615 0000BB65 72F7                <1> 	jb	short loc_createfile_wnc_inv_format_retn
  4616                              <1> 
  4617                              <1> loc_createfile_get_set_write_next_cluster_3:
  4618 0000BB67 8B0D[DC640100]      <1> 	mov	ecx, [createfile_Cluster]
  4619 0000BB6D A3[DC640100]        <1> 	mov	[createfile_Cluster], eax
  4620 0000BB72 890D[E0640100]      <1> 	mov	[createfile_PCluster], ecx
  4621 0000BB78 0FB60D[E5640100]    <1> 	movzx	ecx, byte [createfile_SecPerClust]
  4622 0000BB7F EB85                <1> 	jmp	short loc_createfile_get_set_wf_fclust_cont
  4623                              <1> 
  4624                              <1> loc_createfile_err_retn:
  4625 0000BB81 F9                  <1> 	stc
  4626                              <1> 
  4627                              <1> ;loc_createfile_upd_dir_modif_date_time:
  4628                              <1> loc_createfile_stc_retn_cc: ; 31/03/2016
  4629 0000BB82 9C                  <1> 	pushf	; cpu is here for an error return or completion 
  4630 0000BB83 50                  <1> 	push	eax ; error code if cf = 1
  4631                              <1> 
  4632                              <1> 	;call	update_parent_dir_lmdt
  4633                              <1> 
  4634                              <1> ;loc_createfile_stc_retn_cc:
  4635 0000BB84 A1[A2600100]        <1> 	mov	eax, [FAT_ClusterCounter]
  4636 0000BB89 09C0                <1> 	or	eax, eax
  4637 0000BB8B 741A                <1> 	jz	short loc_createfile_stc_retn_pop_eax
  4638 0000BB8D 8A3D[86590100]      <1> 	mov	bh, [Current_Drv]
  4639 0000BB93 B301                <1> 	mov	bl, 01h ; BL = 1 -> add clusters
  4640                              <1> 	; NOTE: EAX value will be added to Free Cluster Count
  4641                              <1> 	; (If EAX value is negative, Free Cluster Count will be decreased)
  4642 0000BB95 E8AE060000          <1>   	call	calculate_fat_freespace
  4643                              <1>         ; ESI = Logical DOS Drive Description Table Address 
  4644                              <1>         ;jc	short loc_createfile_stc_retn_pop_eax_cf
  4645 0000BB9A 21C9                <1> 	and	ecx, ecx ; cx = 0 -> valid free sector count
  4646 0000BB9C 7409                <1> 	jz	short loc_createfile_stc_retn_pop_eax
  4647                              <1> 
  4648                              <1> loc_createfile_stc_retn_recalc_FAT_freespace:
  4649 0000BB9E 66BB00FF            <1> 	mov	bx, 0FF00h ; bh = 0FFh -> 
  4650                              <1> 	; ESI = Logical DOS Drv DT Addr
  4651                              <1> 	; BL = 0 -> Recalculate 
  4652 0000BBA2 E8A1060000          <1> 	call	calculate_fat_freespace
  4653                              <1> 
  4654                              <1> loc_createfile_stc_retn_pop_eax:
  4655 0000BBA7 58                  <1> 	pop	eax
  4656 0000BBA8 9D                  <1> 	popf
  4657 0000BBA9 7218                <1> 	jc	short loc_createfile_retn
  4658                              <1> 
  4659                              <1> loc_createfile_retn_fcluster:
  4660 0000BBAB A1[D4640100]        <1> 	mov	eax, [createfile_FFCluster]
  4661 0000BBB0 BB[D0640100]        <1> 	mov	ebx, createfile_size
  4662                              <1> 	;movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  4663 0000BBB5 0FB60D[E5640100]    <1> 	movzx	ecx, byte [createfile_SecPerClust] ; 23/03/2016
  4664 0000BBBC 0FB715[E6640100]    <1> 	movzx	edx, word [createfile_DirIndex]
  4665                              <1> 
  4666                              <1> loc_createfile_retn:
  4667 0000BBC3 C3                  <1> 	retn
  4668                              <1> 
  4669                              <1> create_fs_file:
  4670                              <1> 	; temporary (21/03/2016)
  4671 0000BBC4 C3                  <1> 	retn
  4672                              <1> 
  4673                              <1> delete_fs_file:
  4674                              <1> 	; temporary (28/02/2016)
  4675 0000BBC5 C3                  <1> 	retn
  4676                              <1> 
  4677                              <1> rename_fs_file_or_directory:
  4678 0000BBC6 C3                  <1> 	retn
  4679                              <1> 
  4680                              <1> make_fs_directory:
  4681                              <1> 	; temporary (21/02/2016)
  4682 0000BBC7 C3                  <1> 	retn
  4683                              <1> 
  4684                              <1> add_new_fs_section:
  4685                              <1> 	; temporary (11/03/2016)
  4686 0000BBC8 C3                  <1> 	retn
  4687                              <1> 
  4688                              <1> delete_fs_directory_entry:
  4689                              <1> 	; temporary (11/03/2016)
  4690 0000BBC9 C3                  <1> 	retn
  4691                              <1> 
  4692                              <1> csftdf2_read_fs_file_sectors:
  4693                              <1> 	; temporary (19/03/2016)
  4694 0000BBCA C3                  <1> 	retn
  4695                              <1> 
  4696                              <1> csftdf2_write_fs_file_sectors:
  4697                              <1> 	; temporary (19/03/2016)
  4698 0000BBCB C3                  <1> 	retn
  2309                                  %include 'trdosk5.s' ; 24/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - File System Procedures : trdosk5s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 23/10/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; DRV_FAT.ASM (21/08/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; DRV_FAT.ASM (c) 2005-2011 Erdogan TAN [ 07/07/2009 ] Last Update: 21/08/2011
    14                              <1> 
    15                              <1> get_next_cluster:
    16                              <1> 	; 15/10/2016
    17                              <1> 	; 23/03/2016
    18                              <1> 	; 01/02/2016 (TRDOS 386 =  TRDOS v2.0)
    19                              <1> 	; 05/07/2011
    20                              <1> 	; 07/07/2009
    21                              <1> 	; 2005
    22                              <1> 	; INPUT ->
    23                              <1> 	;	EAX = Cluster Number (32 bit)
    24                              <1> 	;	ESI = Logical DOS Drive Parameters Table
    25                              <1> 	; OUTPUT ->
    26                              <1> 	;	cf = 0 -> No Error, EAX valid
    27                              <1> 	;	cf = 1 & EAX = 0 -> End Of Cluster Chain
    28                              <1> 	;	cf = 1 & EAX > 0 -> Error
    29                              <1> 	;	ECX = Current/Previous cluster (if CF = 0)
    30                              <1> 	;	EAX = Next Cluster Number (32 bit)
    31                              <1> 	;
    32                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
    33                              <1> 
    34 0000BBCC A3[96600100]        <1> 	mov	[FAT_CurrentCluster], eax
    35                              <1> check_next_cluster_fat_type:
    36 0000BBD1 29D2                <1> 	sub	edx, edx ; 0
    37 0000BBD3 807E0302            <1>         cmp     byte [esi+LD_FATType], 2
    38 0000BBD7 7250                <1> 	jb	short get_FAT12_next_cluster
    39 0000BBD9 0F87AF000000        <1>         ja      get_FAT32_next_cluster
    40                              <1> get_FAT16_next_cluster:
    41 0000BBDF BB00030000          <1> 	mov	ebx, 300h ;768
    42 0000BBE4 F7F3                <1> 	div	ebx
    43                              <1> 	; EAX = Count of 3 FAT sectors
    44                              <1> 	; EDX = Cluster Offset (< 768)
    45 0000BBE6 66D1E2              <1> 	shl	dx, 1 ; Multiply by 2
    46 0000BBE9 89D3                <1> 	mov	ebx, edx ; Byte Offset
    47 0000BBEB 81C3001C0900        <1> 	add	ebx, FAT_Buffer
    48 0000BBF1 66BA0300            <1> 	mov	dx, 3
    49 0000BBF5 F7E2                <1> 	mul	edx  
    50                              <1> 	; EAX = FAT Sector (<= 256)
    51                              <1> 	; EDX = 0
    52 0000BBF7 8A0E                <1> 	mov	cl, [esi+LD_Name]
    53 0000BBF9 803D[9A600100]00    <1> 	cmp	byte [FAT_BuffValidData], 0
    54 0000BC00 0F86CC000000        <1>         jna     load_FAT_sectors0
    55 0000BC06 3A0D[9B600100]      <1> 	cmp	cl, [FAT_BuffDrvName]
    56 0000BC0C 0F85C0000000        <1>         jne     load_FAT_sectors0
    57 0000BC12 3B05[9E600100]      <1> 	cmp	eax, [FAT_BuffSector]
    58 0000BC18 0F85BA000000        <1>         jne     load_FAT_sectors1
    59                              <1> 	;movzx	eax, word [ebx]
    60 0000BC1E 668B03              <1> 	mov	ax, [ebx]
    61                              <1> 	; 01/02/2016
    62                              <1> 	; DRV_FAT.ASM (21/08/2011) had a FATal bug here !
    63                              <1> 	; (cmp ah, 0Fh) ! (ax >= FF7h)
    64                              <1> 	; (how can i do a such mistake!?)
    65                              <1> 	;cmp	al, 0F7h
    66                              <1> 	;jb	short loc_pass_gnc_FAT16_eoc_check
    67                              <1> 	;cmp	ah, 0FFh
    68                              <1> 	;jb	short loc_pass_gnc_FAT16_eoc_check
    69 0000BC21 6683F8F7            <1> 	cmp	ax, 0FFF7h
    70 0000BC25 725A                <1> 	jb	short loc_pass_gnc_FAT16_eoc_check
    71                              <1> 	; ax >= FFF7h (cluster 0002h to FFF6h is valid, in use)
    72 0000BC27 EB56                <1> 	jmp	short loc_pass_gnc_FAT16_eoc_check_xor_eax
    73                              <1> 
    74                              <1> get_FAT12_next_cluster:
    75 0000BC29 BB00040000          <1> 	mov	ebx, 400h ;1024
    76 0000BC2E F7F3                <1> 	div	ebx
    77                              <1> 	; EAX = Count of 3 FAT sectors
    78                              <1> 	; EDX = Cluster Offset (< 1024)
    79 0000BC30 6650                <1> 	push	ax
    80 0000BC32 66B80300            <1> 	mov	ax, 3	
    81 0000BC36 66F7E2              <1> 	mul	dx    	; Multiply by 3
    82 0000BC39 66D1E8              <1> 	shr	ax, 1	; Divide by 2
    83 0000BC3C 6689C3              <1>         mov	bx, ax 	; Byte Offset
    84 0000BC3F 81C3001C0900        <1> 	add	ebx, FAT_Buffer
    85 0000BC45 6658                <1> 	pop	ax
    86 0000BC47 66BA0300            <1> 	mov	dx, 3
    87 0000BC4B F7E2                <1> 	mul	edx 
    88                              <1> 	; EAX = FAT Sector (<= 12)
    89                              <1> 	; EDX = 0
    90 0000BC4D 8A0E                <1> 	mov	cl, [esi+LD_Name]
    91 0000BC4F 803D[9A600100]00    <1> 	cmp	byte [FAT_BuffValidData], 0
    92 0000BC56 767A                <1> 	jna	short load_FAT_sectors0
    93 0000BC58 3A0D[9B600100]      <1> 	cmp	cl, [FAT_BuffDrvName]
    94 0000BC5E 7572                <1> 	jne	short load_FAT_sectors0
    95 0000BC60 3B05[9E600100]      <1> 	cmp	eax, [FAT_BuffSector]
    96 0000BC66 7570                <1> 	jne	short load_FAT_sectors1
    97 0000BC68 A1[96600100]        <1> 	mov	eax, [FAT_CurrentCluster]
    98 0000BC6D 66D1E8              <1> 	shr	ax, 1
    99                              <1> 	;movzx	eax, word [ebx]
   100 0000BC70 668B03              <1> 	mov	ax, [ebx]
   101 0000BC73 7314                <1> 	jnc	short get_FAT12_nc_even
   102 0000BC75 66C1E804            <1> 	shr	ax, 4
   103                              <1> loc_gnc_fat12_eoc_check:
   104                              <1> 	;cmp	al, 0F7h
   105                              <1> 	;jb	short loc_pass_gnc_FAT16_eoc_check
   106                              <1> 	;cmp	ah, 0Fh
   107                              <1> 	;jb	short loc_pass_gnc_FAT16_eoc_check
   108 0000BC79 663DF70F            <1> 	cmp	ax, 0FF7h
   109 0000BC7D 7202                <1> 	jb	short loc_pass_gnc_FAT16_eoc_check
   110                              <1> 	; ax >= FF7h (cluster 0002h to FF6h is valid, in use)
   111                              <1> 
   112                              <1> loc_pass_gnc_FAT16_eoc_check_xor_eax:
   113 0000BC7F 31C0                <1> 	xor	eax, eax ; 0
   114                              <1> loc_pass_gnc_FAT16_eoc_check:
   115                              <1> loc_pass_gnc_FAT32_eoc_check:
   116 0000BC81 8B0D[96600100]      <1> 	mov	ecx, [FAT_CurrentCluster]
   117 0000BC87 F5                  <1> 	cmc
   118 0000BC88 C3                  <1> 	retn
   119                              <1> 
   120                              <1> get_FAT12_nc_even:
   121 0000BC89 80E40F              <1> 	and	ah, 0Fh
   122 0000BC8C EBEB                <1> 	jmp	short loc_gnc_fat12_eoc_check
   123                              <1> 
   124                              <1> get_FAT32_next_cluster:
   125 0000BC8E BB80010000          <1> 	mov	ebx, 180h ;384
   126 0000BC93 F7F3                <1> 	div	ebx
   127                              <1> 	; EAX = Count of 3 FAT sectors
   128                              <1> 	; EDX = Cluster Offset (< 384)
   129 0000BC95 66C1E202            <1> 	shl	dx, 2	; Multiply by 4
   130 0000BC99 89D3                <1> 	mov	ebx, edx ; Byte Offset
   131 0000BC9B 81C3001C0900        <1> 	add	ebx, FAT_Buffer
   132 0000BCA1 66BA0300            <1> 	mov	dx, 3
   133 0000BCA5 F7E2                <1> 	mul	edx	
   134                              <1>         ; EAX = FAT Sector (<= 2097152) ; (FFFFFF7h * 4) / 512
   135                              <1> 	; 	for 32KB cluster size:
   136                              <1> 	;	EAX <= 1024 = (4GB / 32KB) * 4) / 512 	
   137                              <1> 	; EDX = 0
   138 0000BCA7 8A0E                <1> 	mov	cl, [esi+LD_Name]
   139 0000BCA9 803D[9A600100]00    <1> 	cmp	byte [FAT_BuffValidData], 0
   140 0000BCB0 7620                <1> 	jna	short load_FAT_sectors0
   141 0000BCB2 3A0D[9B600100]      <1> 	cmp	cl, [FAT_BuffDrvName]
   142 0000BCB8 7518                <1> 	jne	short load_FAT_sectors0
   143 0000BCBA 3B05[9E600100]      <1> 	cmp	eax, [FAT_BuffSector] ; 0, 3, 6, 9 ...
   144 0000BCC0 7516                <1> 	jne	short load_FAT_sectors1
   145 0000BCC2 8B03                <1> 	mov	eax, [ebx]
   146 0000BCC4 25FFFFFF0F          <1>  	and	eax, 0FFFFFFFh ; 28 bit Cluster
   147 0000BCC9 3DF7FFFF0F          <1> 	cmp	eax, 0FFFFFF7h
   148 0000BCCE 72B1                <1> 	jb	short loc_pass_gnc_FAT32_eoc_check
   149                              <1> 	; eax >= FFFFFF7h (cluster 0002h to FFFFFF6h is valid)
   150 0000BCD0 EBAD                <1> 	jmp	short loc_pass_gnc_FAT16_eoc_check_xor_eax
   151                              <1> 
   152                              <1> load_FAT_sectors0:
   153 0000BCD2 880D[9B600100]      <1> 	mov	[FAT_BuffDrvName], cl
   154                              <1> load_FAT_sectors1:
   155 0000BCD8 A3[9E600100]        <1> 	mov	[FAT_BuffSector], eax
   156 0000BCDD 89C3                <1> 	mov	ebx, eax
   157 0000BCDF 034660              <1>         add     eax, [esi+LD_FATBegin]
   158 0000BCE2 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
   159 0000BCE6 7706                <1>         ja      short load_FAT_sectors3
   160 0000BCE8 0FB74E1C            <1> 	movzx	ecx, word [esi+LD_BPB+BPB_FATSz16]
   161 0000BCEC EB03                <1> 	jmp	short load_FAT_sectors4
   162                              <1> load_FAT_sectors3:
   163 0000BCEE 8B4E2A              <1> 	mov	ecx, [esi+LD_BPB+BPB_FATSz32]
   164                              <1> load_FAT_sectors4:
   165 0000BCF1 29D9                <1> 	sub	ecx, ebx ; [FAT_BuffSector]
   166 0000BCF3 83F903              <1>         cmp     ecx, 3
   167 0000BCF6 7605                <1>         jna     short load_FAT_sectors5
   168 0000BCF8 B903000000          <1> 	mov	ecx, 3
   169                              <1> load_FAT_sectors5:
   170 0000BCFD BB001C0900          <1> 	mov	ebx, FAT_Buffer
   171 0000BD02 E8553B0000          <1> 	call	disk_read
   172 0000BD07 730D                <1> 	jnc	short load_FAT_sectors_ok
   173                              <1> 	; 15/10/2016 (15h -> 17)
   174                              <1> 	; 23/03/2016 (15h)
   175 0000BD09 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error
   176 0000BD0E C605[9A600100]00    <1> 	mov	byte [FAT_BuffValidData], 0
   177 0000BD15 C3                  <1> 	retn
   178                              <1> load_FAT_sectors_ok:
   179 0000BD16 C605[9A600100]01    <1> 	mov	byte [FAT_BuffValidData], 1
   180 0000BD1D A1[96600100]        <1> 	mov	eax, [FAT_CurrentCluster]
   181 0000BD22 E9AAFEFFFF          <1>         jmp     check_next_cluster_fat_type
   182                              <1> 
   183                              <1> load_FAT_root_directory:
   184                              <1> 	; 23/10/2016
   185                              <1> 	; 15/10/2016
   186                              <1> 	; 07/02/2016
   187                              <1> 	; 02/02/2016
   188                              <1> 	; 01/02/2016 (TRDOS 386 =  TRDOS v2.0)
   189                              <1> 	; 21/05/2011
   190                              <1> 	; 22/08/2009
   191                              <1> 	;
   192                              <1> 	; INPUT ->
   193                              <1> 	;	ESI = Logical DOS Drive Description Table
   194                              <1> 	; OUTPUT ->
   195                              <1> 	;	cf = 1 -> Root directory could not be loaded
   196                              <1> 	;	    EAX > 0 -> Error number
   197                              <1> 	;	cf = 0 -> EAX = 0
   198                              <1> 	;	ECX = Directory buffer size in sectors (CL)
   199                              <1> 	;	EBX = Directory buffer address
   200                              <1> 	; 	NOTE: DirBuffer_Size is in bytes ! (word)
   201                              <1> 	;
   202                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
   203                              <1> 
   204                              <1> 	; NOTE: Only for FAT12 and FAT16 file systems !
   205                              <1> 	; (FAT32 fs root dir must be loaded as sub directory)
   206                              <1> 
   207 0000BD27 8A1E                <1> 	mov	bl, [esi+LD_Name]
   208 0000BD29 8A7E03              <1> 	mov	bh, [esi+LD_FATType]
   209                              <1> 
   210                              <1> 	;mov	[DirBuff_DRV], bl
   211                              <1> 	;mov	[DirBuff_FATType], bh
   212 0000BD2C 66891D[AA600100]    <1> 	mov	[DirBuff_DRV], bx
   213                              <1> 	
   214                              <1> 	;cmp	bh, 2
   215                              <1> 	;ja	short load_FAT32_root_dir0 ; FAT32 root dir
   216                              <1> 
   217                              <1> load_FAT_root_dir0: ; 23/10/2016
   218 0000BD33 0FB75617            <1> 	movzx	edx, word [esi+LD_BPB+RootDirEnts]
   219                              <1> 
   220                              <1> 	;or	dx, dx ; 0 for FAT32 file systems
   221                              <1> 	;jz	short load_FAT32_root_dir0 ; FAT32 root dir
   222                              <1> 
   223 0000BD37 6681FA0002          <1> 	cmp	dx, 512 ; Number of Root Dir Entries
   224 0000BD3C 7414                <1> 	je	short lrd_mov_ecx_32
   225 0000BD3E 89D0                <1> 	mov	eax, edx
   226                              <1> 	; 23/10/2016
   227 0000BD40 89C1                <1> 	mov	ecx, eax
   228 0000BD42 6683C10F            <1> 	add	cx, 15 ; round up 
   229 0000BD46 66C1E904            <1> 	shr	cx, 4  ; 16 entries per sector (512/32)
   230                              <1> 	; ecx = Root directory size in sectors
   231 0000BD4A 66C1E005            <1> 	shl	ax, 5 ; Root directory size in bytes
   232 0000BD4E 664A                <1> 	dec	dx    ; Last entry number of root dir
   233                              <1> 	; cx = Dir Buffer sector count             
   234 0000BD50 EB0B                <1> 	jmp	short lrd_check_dir_buffer
   235                              <1> 
   236                              <1> lrd_mov_ecx_32:
   237 0000BD52 B920000000          <1> 	mov	ecx, 32
   238 0000BD57 664A                <1> 	dec	dx ; 511
   239 0000BD59 66B80040            <1> 	mov	ax, 32*512 
   240                              <1>  
   241                              <1> lrd_check_dir_buffer:
   242 0000BD5D 29DB                <1> 	sub	ebx, ebx ; 0
   243 0000BD5F 881D[AC600100]      <1> 	mov	[DirBuff_ValidData], bl ; 0
   244 0000BD65 668915[AF600100]    <1> 	mov	[DirBuff_LastEntry], dx
   245 0000BD6C 891D[B1600100]      <1> 	mov	[DirBuff_Cluster], ebx ; 0
   246 0000BD72 66A3[B5600100]      <1> 	mov	[DirBuffer_Size], ax
   247                              <1> 
   248 0000BD78 8B4664              <1> 	mov	eax, [esi+LD_ROOTBegin]
   249                              <1> read_directory:
   250 0000BD7B BB00000800          <1> 	mov	ebx, Directory_Buffer
   251 0000BD80 51                  <1> 	push	ecx ; Directory buffer sector count
   252 0000BD81 53                  <1> 	push	ebx
   253 0000BD82 E8D53A0000          <1> 	call	disk_read
   254 0000BD87 5B                  <1> 	pop	ebx
   255 0000BD88 720B                <1> 	jc	short load_DirBuff_error
   256                              <1> 
   257                              <1> validate_DirBuff_and_return:
   258 0000BD8A 59                  <1> 	pop	ecx ; Number of loaded sectors
   259 0000BD8B C605[AC600100]01    <1> 	mov	byte [DirBuff_ValidData], 1
   260 0000BD92 31C0                <1> 	xor	eax, eax ; 0 = no error
   261 0000BD94 C3                  <1> 	retn
   262                              <1> 
   263                              <1> load_DirBuff_error:
   264 0000BD95 89C8                <1> 	mov	eax, ecx ; remaining sectors
   265 0000BD97 59                  <1> 	pop	ecx ; sector count
   266 0000BD98 29C1                <1> 	sub	ecx, eax ; Number of loaded sectors
   267                              <1> 	; 15/10/2016 (15h -> 17)
   268 0000BD9A B811000000          <1> 	mov	eax, 17 ; DRV NOT READY OR READ ERROR !
   269 0000BD9F F9                  <1> 	stc
   270 0000BDA0 C3                  <1>         retn
   271                              <1> 
   272                              <1> load_FAT32_root_directory:
   273                              <1> 	; 02/02/2016 (TRDOS 386 =  TRDOS v2.0)
   274                              <1> 	;
   275                              <1> 	; INPUT ->
   276                              <1> 	;	ESI = Logical DOS Drive Description Table
   277                              <1> 	; OUTPUT ->
   278                              <1> 	;	cf = 1 -> Root directory could not be loaded
   279                              <1> 	;	    EAX > 0 -> Error number
   280                              <1> 	;	cf = 0 -> EAX = 0
   281                              <1> 	;	ECX = Directory buffer size in sectors (CL)
   282                              <1> 	;	EBX = Directory buffer address
   283                              <1> 	; 	NOTE: DirBuffer_Size is in bytes ! (word)
   284                              <1> 	;
   285                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
   286                              <1> 
   287                              <1> 
   288 0000BDA1 8A1E                <1> 	mov	bl, [esi+LD_Name]
   289 0000BDA3 8A7E03              <1> 	mov	bh, [esi+LD_FATType]
   290                              <1> 
   291                              <1> 	;mov	[DirBuff_DRV], bl
   292                              <1> 	;mov	[DirBuff_FATType], bh
   293 0000BDA6 66891D[AA600100]    <1> 	mov	[DirBuff_DRV], bx
   294                              <1> 
   295                              <1> load_FAT32_root_dir0:
   296 0000BDAD 8B4632              <1> 	mov	eax, [esi+LD_BPB+FAT32_RootFClust]
   297 0000BDB0 EB0C                <1> 	jmp	short load_FAT_sub_dir0
   298                              <1> 	
   299                              <1> load_FAT_sub_directory:
   300                              <1> 	; 01/02/2016 (TRDOS 386 =  TRDOS v2.0)
   301                              <1> 	; 05/07/2011
   302                              <1> 	; 23/08/2009
   303                              <1> 	;
   304                              <1> 	; INPUT ->
   305                              <1> 	;	ESI = Logical DOS Drive Description Table
   306                              <1> 	;	EAX = Cluster Number
   307                              <1> 	; OUTPUT ->
   308                              <1> 	;	cf = 1 -> Sub directory could not be loaded
   309                              <1> 	;	    EAX > 0 -> Error number
   310                              <1> 	;	cf = 0 -> EAX = 0
   311                              <1> 	;	ECX = Directory buffer size in sectors (CL)
   312                              <1> 	;	EBX = Directory buffer address
   313                              <1> 	;
   314                              <1> 	; 	NOTE: DirBuffer_Size is in bytes ! (word)
   315                              <1> 	;
   316                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
   317                              <1> 
   318 0000BDB2 8A1E                <1> 	mov	bl, [esi+LD_Name]
   319 0000BDB4 8A7E03              <1> 	mov	bh, [esi+LD_FATType]
   320                              <1> 
   321                              <1> 	;mov	[DirBuff_DRV], bl
   322                              <1> 	;mov	[DirBuff_FATType], bh
   323 0000BDB7 66891D[AA600100]    <1> 	mov	[DirBuff_DRV], bx
   324                              <1> 
   325                              <1> load_FAT_sub_dir0:
   326 0000BDBE 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
   327                              <1> 
   328 0000BDC2 882D[AC600100]      <1> 	mov	[DirBuff_ValidData], ch ; 0
   329 0000BDC8 A3[B1600100]        <1> 	mov	[DirBuff_Cluster], eax
   330                              <1> 
   331 0000BDCD 0FB74611            <1> 	movzx	eax, word [esi+LD_BPB+BytesPerSec]
   332 0000BDD1 F7E1                <1> 	mul	ecx
   333 0000BDD3 C1E805              <1> 	shr	eax, 5 ; directory entry count (dir size / 32)
   334 0000BDD6 6648                <1> 	dec	ax ; last entry
   335 0000BDD8 66A3[AF600100]      <1> 	mov	[DirBuff_LastEntry], ax
   336                              <1> 
   337 0000BDDE A1[B1600100]        <1> 	mov	eax, [DirBuff_Cluster]
   338 0000BDE3 83E802              <1> 	sub	eax, 2
   339 0000BDE6 F7E1                <1> 	mul	ecx
   340 0000BDE8 034668              <1> 	add	eax, [esi+LD_DATABegin]
   341                              <1> 	; ecx = sector per cluster (dir buffer size = 32 sectors)
   342 0000BDEB EB8E                <1> 	jmp	short read_directory
   343                              <1> 
   344                              <1> ; DRV_FS.ASM
   345                              <1> 
   346                              <1> load_current_FS_directory:
   347 0000BDED C3                  <1> 	retn
   348                              <1> load_FS_root_directory:
   349 0000BDEE C3                  <1> 	retn
   350                              <1> load_FS_sub_directory:
   351 0000BDEF C3                  <1> 	retn
   352                              <1> 
   353                              <1> read_cluster:
   354                              <1> 	; 15/10/2016
   355                              <1> 	; 18/03/2016
   356                              <1> 	; 16/03/2016
   357                              <1> 	; 17/02/2016
   358                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
   359                              <1> 	;
   360                              <1> 	; INPUT ->
   361                              <1> 	;	EAX = Cluster Number (Sector index for SINGLIX FS)
   362                              <1> 	;	ESI = Logical DOS Drive Description Table address
   363                              <1> 	;	EBX = Cluster (File R/W) Buffer address (max. 64KB)
   364                              <1> 	;	Only for SINGLIX FS:
   365                              <1> 	;	EDX = File Number (The 1st FDT address) 
   366                              <1> 	; OUTPUT ->
   367                              <1> 	;	cf = 1 -> Cluster can not be loaded at the buffer
   368                              <1> 	;	    EAX > 0 -> Error number
   369                              <1> 	;	cf = 0 -> Cluster has been loaded at the buffer
   370                              <1> 	;
   371                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
   372                              <1> 	
   373 0000BDF0 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+BPB_SecPerClust] 
   374                              <1> 	; CL = 1 = [esi+LD_FS_Reserved2] ; SectPerClust for Singlix FS
   375                              <1> 
   376                              <1> read_file_sectors: ; 16/03/2016
   377 0000BDF4 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
   378 0000BDF8 761C                <1> 	jna	short read_fs_cluster
   379                              <1> 
   380                              <1> read_fat_file_sectors: ; 18/03/2016
   381 0000BDFA 83E802              <1> 	sub	eax, 2 ; Beginning cluster number is always 2
   382 0000BDFD 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+BPB_SecPerClust] ; 18/03/2016 
   383 0000BE01 F7E2                <1> 	mul	edx
   384 0000BE03 034668              <1> 	add	eax, [esi+LD_DATABegin] ; absolute address of the cluster
   385                              <1> 
   386                              <1> 	; EAX = Disk sector address
   387                              <1> 	; ECX = Sector count
   388                              <1> 	; EBX = Buffer address
   389                              <1> 	; (EDX = 0)
   390                              <1> 	; ESI = Logical DOS drive description table address	
   391                              <1> 
   392 0000BE06 E8513A0000          <1> 	call	disk_read
   393 0000BE0B 7306                <1> 	jnc	short rclust_retn
   394                              <1> 	
   395                              <1> 	; 15/10/2016 (15h -> 17)
   396 0000BE0D B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error !
   397 0000BE12 C3                  <1> 	retn
   398                              <1> 
   399                              <1> rclust_retn:
   400 0000BE13 29C0                <1> 	sub	eax, eax ; 0
   401 0000BE15 C3                  <1> 	retn
   402                              <1> 
   403                              <1> read_fs_cluster:
   404                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
   405                              <1> 	; Singlix FS
   406                              <1> 	
   407                              <1> 	; EAX = Cluster number is sector index number of the file (eax)
   408                              <1> 	
   409                              <1> 	; EDX = File number is the first File Descriptor Table address 
   410                              <1> 	;	of the file. (Absolute address of the FDT).
   411                              <1> 	
   412                              <1> 	; eax = sector index (0 for the first sector)
   413                              <1> 	; edx = FDT0 address
   414                              <1> 		; 64 KB buffer = 128 sectors (limit) 
   415 0000BE16 B980000000          <1> 	mov	ecx, 128 ; maximum count of sectors (before eof) 
   416 0000BE1B E801000000          <1> 	call	read_fs_sectors
   417 0000BE20 C3                  <1> 	retn
   418                              <1> 
   419                              <1> read_fs_sectors:
   420                              <1> 	; 15/02/2016 (TRDOS 386 =  TRDOS v2.0)
   421 0000BE21 F9                  <1> 	stc
   422 0000BE22 C3                  <1> 	retn
   423                              <1> 
   424                              <1> get_first_free_cluster:
   425                              <1> 	; 02/03/2016
   426                              <1> 	; 21/02/2016 (TRDOS 386 =  TRDOS v2.0)
   427                              <1> 	; 26/10/2010 (DRV_FAT.ASM, 'proc_get_first_free_cluster')
   428                              <1> 	; 10/07/2010
   429                              <1> 	; INPUT ->
   430                              <1> 	;	ESI = Logical DOS Drive Description Table address
   431                              <1> 	; OUTPUT ->
   432                              <1> 	;	cf = 1 -> Error code in AL (EAX)
   433                              <1> 	;	cf = 0 -> 
   434                              <1> 	;	  EAX = Cluster number 
   435                              <1> 	;	  If EAX = FFFFFFFFh -> no free space
   436                              <1> 	;	If the drive has FAT32 fs:
   437                              <1> 	;	  EBX = FAT32 FSI sector buffer address (if > 0)
   438                              <1> 
   439 0000BE23 8B4678              <1> 	mov	eax, [esi+LD_Clusters]
   440 0000BE26 40                  <1> 	inc	eax ; add eax, 1
   441 0000BE27 A3[34630100]        <1> 	mov	[gffc_last_free_cluster], eax
   442                              <1> 
   443 0000BE2C 31DB                <1> 	xor	ebx, ebx ; 0 ; 02/03/2016
   444                              <1> 
   445 0000BE2E 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
   446 0000BE32 760E                <1> 	jna	short loc_gffc_get_first_fat_free_cluster0
   447                              <1> 
   448                              <1> loc_gffc_get_first_fat32_free_cluster:
   449                              <1> 	; 02/03/2016
   450 0000BE34 E844060000          <1> 	call	get_fat32_fsinfo_sector_parms
   451 0000BE39 7207                <1> 	jc	short loc_gffc_get_first_fat_free_cluster0 
   452                              <1> 
   453                              <1> loc_gffc_check_fsinfo_parms:
   454                              <1> 	;;mov	ebx, DOSBootSectorBuff
   455                              <1> 	;cmp	dword [ebx], 41615252h
   456                              <1> 	;jne	short loc_gffc_fat32_fsinfo_err
   457                              <1> 	;cmp	dword [ebx+484], 61417272h
   458                              <1> 	;jne	short loc_gffc_fat32_fsinfo_err
   459                              <1> 	;mov	eax, [ebx+492] ; FSI_Next_Free
   460                              <1> 	;EAX = First free cluster 
   461                              <1> 	;(from FAT32 FSInfo sector)
   462 0000BE3B 89D0                <1> 	mov	eax, edx ; FSI_Next_Free (First Free Cluster)
   463 0000BE3D 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh ; invalid (unknown) !
   464 0000BE40 7205                <1> 	jb	short loc_gffc_get_first_fat_free_cluster1
   465                              <1> 
   466                              <1> 	; Start from the 1st cluster of the FAT(32) file system
   467                              <1> loc_gffc_get_first_fat_free_cluster0:
   468 0000BE42 B802000000          <1> 	mov	eax, 2
   469                              <1> 	;xor	edx, edx
   470                              <1> 
   471                              <1> loc_gffc_get_first_fat_free_cluster1:
   472 0000BE47 53                  <1> 	push	ebx ; 02/03/2016 
   473                              <1> 
   474                              <1> loc_gffc_get_first_fat_free_cluster2:   
   475 0000BE48 A3[30630100]        <1> 	mov	[gffc_first_free_cluster], eax
   476 0000BE4D A3[2C630100]        <1> 	mov	[gffc_next_free_cluster], eax
   477                              <1> 
   478                              <1> 	; EBX = FAT32 FSINFO sector buffer address
   479                              <1> 	; (EBX = 0, if the drive has not got FAT32 fs or
   480                              <1> 	; FAT32 FSINFO sector buffer is invalid.)
   481                              <1> 
   482                              <1> loc_gffc_get_first_fat_free_cluster3:
   483 0000BE52 E875FDFFFF          <1> 	call	get_next_cluster
   484 0000BE57 7307                <1> 	jnc	short loc_gffc_get_first_fat_free_cluster4
   485 0000BE59 09C0                <1> 	or	eax, eax
   486 0000BE5B 740B                <1> 	jz	short loc_gffc_first_free_fat_cluster_next
   487 0000BE5D 5B                  <1> 	pop	ebx ; 02/03/2016
   488 0000BE5E F5                  <1> 	cmc 	; stc
   489 0000BE5F C3                  <1> 	retn
   490                              <1> 
   491                              <1> loc_gffc_get_first_fat_free_cluster4:
   492 0000BE60 21C0                <1> 	and	eax, eax ; next cluster value
   493 0000BE62 7504                <1> 	jnz	short loc_gffc_first_free_fat_cluster_next
   494 0000BE64 89C8                <1> 	mov	eax, ecx ; current (previous cluster) value
   495 0000BE66 EB22                <1> 	jmp	short loc_gffc_check_for_set
   496                              <1>  
   497                              <1> loc_gffc_first_free_fat_cluster_next:
   498 0000BE68 A1[2C630100]        <1> 	mov	eax, [gffc_next_free_cluster]
   499 0000BE6D 3B05[34630100]      <1> 	cmp	eax, [gffc_last_free_cluster]
   500 0000BE73 7308                <1> 	jnb	short retn_stc_from_get_first_free_cluster
   501                              <1> pass_gffc_last_cluster_eax_check:
   502 0000BE75 40                  <1> 	inc	eax ; add eax, 1
   503 0000BE76 A3[2C630100]        <1> 	mov	[gffc_next_free_cluster], eax
   504 0000BE7B EBD5                <1> 	jmp	short loc_gffc_get_first_fat_free_cluster3
   505                              <1> 
   506                              <1> retn_stc_from_get_first_free_cluster:
   507 0000BE7D A1[30630100]        <1> 	mov	eax, [gffc_first_free_cluster]
   508 0000BE82 83F802              <1> 	cmp	eax, 2
   509 0000BE85 7709                <1> 	ja	short loc_gffc_check_previous_clusters
   510 0000BE87 29C0                <1> 	sub	eax, eax
   511 0000BE89 48                  <1> 	dec	eax ; FFFFFFFFh
   512                              <1> 
   513                              <1> loc_gffc_check_for_set:
   514                              <1> 	; 02/03/2016
   515 0000BE8A 5B                  <1> 	pop	ebx
   516                              <1> 
   517                              <1> 	; EBX = FAT32 FSINFO sector buffer address
   518                              <1> 	; (EBX = 0, if the drive has not got FAT32 fs or
   519                              <1> 	; FAT32 FSINFO sector buffer is invalid.)
   520                              <1> 
   521 0000BE8B 09DB                <1> 	or	ebx, ebx
   522 0000BE8D 750E                <1> 	jnz	short loc_gffc_set_ffree_fat32_cluster
   523                              <1> 
   524                              <1> 	;cmp	byte [esi+LD_FATType], 3
   525                              <1> 	;jnb	short loc_gffc_set_ffree_fat32_cluster
   526                              <1> 
   527                              <1> 	;xor	ebx, ebx ; 0
   528                              <1> 
   529                              <1> loc_gffc_retn:
   530 0000BE8F C3                  <1> 	retn
   531                              <1> 
   532                              <1> loc_gffc_check_previous_clusters:
   533 0000BE90 48                  <1> 	dec	eax ; sub eax, 1
   534 0000BE91 A3[34630100]        <1> 	mov	[gffc_last_free_cluster], eax 
   535 0000BE96 B802000000          <1> 	mov	eax, 2
   536                              <1> 	;xor	edx, edx
   537 0000BE9B EBAB                <1> 	jmp	short loc_gffc_get_first_fat_free_cluster2
   538                              <1> 
   539                              <1> loc_gffc_set_ffree_fat32_cluster:
   540                              <1> 	;call	set_first_free_cluster
   541                              <1> 	;retn
   542                              <1> 	;jmp	short set_first_free_cluster	
   543                              <1> 
   544                              <1> set_first_free_cluster:
   545                              <1> 	; 15/10/2016
   546                              <1> 	; 23/03/2016
   547                              <1> 	; 02/03/2016
   548                              <1> 	; 29/02/2016
   549                              <1> 	; 26/02/2016
   550                              <1> 	; 21/02/2016 (TRDOS 386 =  TRDOS v2.0)
   551                              <1> 	; 21/08/2011 (DRV_FAT.ASM, 'proc_set_first_free_cluster')
   552                              <1> 	; 11/07/2010
   553                              <1> 	; INPUT -> 
   554                              <1> 	;	ESI = Logical DOS Drive Description Table address
   555                              <1> 	;	EAX = First free cluster
   556                              <1> 	;	EBX = FSINFO sector buffer address
   557                              <1> 	;  	;;If EBX > 0, it is FSINFO sector buffer address
   558                              <1> 	;	;;EBX = 0, if FSINFO sector is not loaded
   559                              <1> 	; OUTPUT->
   560                              <1> 	;	ESI = Logical DOS Drive Description Table address
   561                              <1> 	;  	If EBX > 0, it is FSINFO sector buffer address
   562                              <1> 	;	EBX = 0, if FSINFO sector could not be loaded
   563                              <1> 	; 	CF = 1 -> Error code in AL (EAX)
   564                              <1> 	;	CF = 0 -> first free cluster is successfully updated 
   565                              <1> 
   566                              <1> 	;cmp	byte [esi+LD_FATType], 3
   567                              <1> 	;jb	short loc_sffc_invalid_drive
   568                              <1> 
   569                              <1> 	; Save First Free Cluster value for 'update_cluster'
   570 0000BE9D 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; First free Cluster	
   571                              <1> 
   572                              <1> 	;or	ebx, ebx
   573                              <1> 	;jnz	short loc_sffc_read_fsinfo_sector
   574                              <1> 
   575 0000BEA0 813B52526141        <1> 	cmp     dword [ebx], 41615252h
   576 0000BEA6 7540                <1> 	jne	short loc_sffc_read_fsinfo_sector
   577 0000BEA8 81BBE4010000727241- <1> 	cmp	dword [ebx+484], 61417272h
   577 0000BEB1 61                  <1>
   578 0000BEB2 7534                <1> 	jne	short loc_sffc_read_fsinfo_sector
   579                              <1> 
   580 0000BEB4 3B83EC010000        <1> 	cmp	eax, [ebx+492]  ; FSI_Next_Free
   581 0000BEBA 741F                <1> 	je	short loc_sffc_retn
   582                              <1> 
   583                              <1> loc_sffc_write_fsinfo_sector:
   584                              <1> 	; EBX = FSINFO sector buffer
   585                              <1> 	; [CFS_FAT32FSINFOSEC] is set in 'get_fat32_fsinfo_sector_parms'
   586 0000BEBC 8983EC010000        <1> 	mov	[ebx+492], eax
   587 0000BEC2 A1[44630100]        <1> 	mov	eax, [CFS_FAT32FSINFOSEC] 
   588 0000BEC7 B901000000          <1> 	mov	ecx, 1
   589 0000BECC 53                  <1> 	push	ebx
   590 0000BECD E87B390000          <1> 	call	disk_write
   591 0000BED2 7208                <1> 	jc      short loc_sffc_read_fsinfo_sector_err1
   592 0000BED4 5B                  <1> 	pop	ebx
   593                              <1> 
   594 0000BED5 8B83EC010000        <1> 	mov	eax, [ebx+492] ; First (Next) Free Cluster
   595                              <1> 
   596                              <1> loc_sffc_retn:
   597 0000BEDB C3                  <1> 	retn
   598                              <1> 
   599                              <1> ;loc_sffc_invalid_drive:
   600                              <1> ;	mov	eax, 0Fh ; MSDOS Error : Invalid drive
   601                              <1> ;	push	edx
   602                              <1> 
   603                              <1> loc_sffc_read_fsinfo_sector_err1:
   604 0000BEDC BB00000000          <1> 	mov	ebx, 0
   605                              <1> 	; 15/10/2016 (1Dh -> 18)
   606                              <1> 	; 23/03/2016 (1Dh)
   607 0000BEE1 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error
   608                              <1> 
   609                              <1> loc_sffc_read_fsinfo_sector_err2:
   610 0000BEE6 5A                  <1> 	pop	edx
   611 0000BEE7 C3                  <1> 	retn
   612                              <1> 	
   613                              <1> loc_sffc_read_fsinfo_sector:
   614 0000BEE8 50                  <1> 	push	eax
   615                              <1> 
   616 0000BEE9 E88F050000          <1> 	call	get_fat32_fsinfo_sector_parms
   617 0000BEEE 72F6                <1> 	jc	short loc_sffc_read_fsinfo_sector_err2
   618                              <1> 
   619 0000BEF0 58                  <1> 	pop	eax
   620                              <1> 	; EDX = First (Next) Free Cluster value from FSINFO sector
   621                              <1> 	; EAX = First Free Cluster value from 'get_next_cluster'
   622                              <1> 	; (edx = old value)
   623 0000BEF1 39D0                <1> 	cmp	eax, edx ; First free Cluster (eax = new value) 
   624 0000BEF3 75C7                <1> 	jne	short loc_sffc_write_fsinfo_sector
   625                              <1> 
   626 0000BEF5 C3                  <1> 	retn	
   627                              <1> 
   628                              <1> update_cluster:
   629                              <1> 	; 23/10/2016
   630                              <1> 	; 23/03/2016
   631                              <1> 	; 02/03/2016
   632                              <1> 	; 01/03/2016
   633                              <1> 	; 29/02/2016
   634                              <1> 	; 27/02/2016
   635                              <1> 	; 26/02/2016
   636                              <1> 	; 22/02/2016 (TRDOS 386 =  TRDOS v2.0)
   637                              <1> 	; 11/08/2011  
   638                              <1> 	; 09/02/2005
   639                              <1> 	; INPUT ->
   640                              <1> 	;	EAX = Cluster Number
   641                              <1> 	;	ECX = New Cluster Value
   642                              <1> 	;	ESI = Logical Dos Drive Parameters Table
   643                              <1> 	;
   644                              <1> 	;	/// dword [FAT_ClusterCounter] ///
   645                              <1> 	;
   646                              <1> 	; OUTPUT ->
   647                              <1> 	;	cf = 0 -> No Error, EAX is valid
   648                              <1> 	;	cf = 1 & EAX = 0 -> End Of Cluster Chain
   649                              <1> 	; 	cf = 1 & EAX > 0 -> Error
   650                              <1> 	;		(ECX -> any value)
   651                              <1> 	; 	EAX = Next Cluster
   652                              <1> 	;	ECX = New Cluster Value
   653                              <1> 	;
   654                              <1> 	;	/// [FAT_ClusterCounter] is updated,
   655                              <1> 	;	/// decreased when a free cluster is assigned,
   656                              <1> 	;	/// increased if an assigned cluster is freed.	
   657                              <1> 	;		
   658                              <1> 	;
   659                              <1> 	; (Modified registers: EAX, EBX, -ECX-, EDX)
   660                              <1> 	
   661 0000BEF6 A3[96600100]        <1> 	mov	[FAT_CurrentCluster], eax
   662 0000BEFB 890D[38630100]      <1> 	mov	[ClusterValue], ecx
   663                              <1> 
   664                              <1> loc_update_cluster_check_fat_buffer:
   665 0000BF01 8A1E                <1> 	mov	bl, [esi+LD_Name]
   666 0000BF03 381D[9B600100]      <1> 	cmp	[FAT_BuffDrvName], bl
   667 0000BF09 741A                <1> 	je	short loc_update_cluster_check_fat_type
   668 0000BF0B 803D[9A600100]02    <1> 	cmp	byte [FAT_BuffValidData], 2
   669 0000BF12 0F84C2000000        <1>         je      loc_uc_save_fat_buffer
   670                              <1> 
   671                              <1> loc_uc_reset_fat_buffer_validation:
   672 0000BF18 C605[9A600100]00    <1> 	mov	byte [FAT_BuffValidData], 0
   673                              <1> 
   674                              <1> loc_uc_check_fat_type_reset_drvname:
   675 0000BF1F 881D[9B600100]      <1> 	mov	[FAT_BuffDrvName], bl
   676                              <1> 
   677                              <1> loc_update_cluster_check_fat_type:
   678 0000BF25 29D2                <1> 	sub	edx, edx ; 26/02/2016
   679 0000BF27 8A5E03              <1> 	mov	bl, [esi+LD_FATType]
   680 0000BF2A 83F802              <1> 	cmp	eax, 2
   681 0000BF2D 0F82BE000000        <1>         jb      update_cluster_inv_data
   682 0000BF33 80FB02              <1> 	cmp	bl, 2 
   683 0000BF36 0F877A010000        <1>         ja      update_fat32_cluster
   684                              <1> 	;cmp	bl, 1
   685                              <1> 	;jb	short update_cluster_inv_data
   686 0000BF3C 8B4E78              <1> 	mov	ecx, [esi+LD_Clusters]
   687 0000BF3F 41                  <1> 	inc	ecx  
   688 0000BF40 890D[A6600100]      <1> 	mov	[LastCluster], ecx
   689 0000BF46 39C8                <1> 	cmp	eax, ecx ; dword [LastCluster]
   690 0000BF48 0F87A6000000        <1>         ja      return_uc_fat_stc
   691                              <1> 	; TRDOS v1 has a FATal bug here ! 
   692                              <1> 		; or bl, bl ; cmp bl, 0
   693                              <1> 		; jz short update_fat12_cluster
   694                              <1> 	; !! It would destroy FAT12 floppy disk fs here !!
   695                              <1> 	; ('A:' disks of TRDOS v1 operating system project
   696                              <1> 	; had 'singlix fs', so, I could not differ this mistake
   697                              <1> 	; on a drive 'A:')
   698 0000BF4E 80FB01              <1> 	cmp	bl, 1 ; correct comparison is this !
   699 0000BF51 0F86A2000000        <1>         jna     update_fat12_cluster 
   700                              <1> 
   701                              <1> update_fat16_cluster:
   702                              <1> pass_uc_fat16_errc:
   703                              <1> 	;sub	edx, edx
   704 0000BF57 BB00030000          <1> 	mov	ebx, 300h ;768
   705 0000BF5C F7F3                <1> 	div	ebx
   706                              <1> 	; EAX = Count of 3 FAT sectors
   707                              <1> 	; DX = Cluster offset in FAT buffer
   708 0000BF5E 6689D3              <1> 	mov	bx, dx  
   709 0000BF61 66D1E3              <1> 	shl	bx, 1 ; Multiply by 2
   710 0000BF64 66BA0300            <1> 	mov	dx, 3
   711 0000BF68 F7E2                <1> 	mul	edx  
   712                              <1> 	; EAX = FAT Sector
   713                              <1> 	; EDX = 0
   714                              <1> 	; EBX = Byte offset in FAT buffer
   715 0000BF6A 8A0D[9A600100]      <1> 	mov	cl, [FAT_BuffValidData]
   716 0000BF70 80F902              <1> 	cmp	cl, 2
   717 0000BF73 750A                <1> 	jne	short loc_uc_check_fat16_buff_sector_load
   718                              <1> 
   719                              <1> loc_uc_check_fat16_buff_sector_save:
   720 0000BF75 3B05[9E600100]      <1> 	cmp	eax, [FAT_BuffSector]
   721 0000BF7B 755D                <1> 	jne	short loc_uc_save_fat_buffer
   722 0000BF7D EB15                <1> 	jmp	short loc_update_fat16_cell
   723                              <1> 
   724                              <1> loc_uc_check_fat16_buff_sector_load:
   725 0000BF7F 80F901              <1> 	cmp	cl, 1 ; byte [FAT_BuffValidData]
   726 0000BF82 0F85FB010000        <1>         jne     loc_uc_load_fat_sectors
   727 0000BF88 3B05[9E600100]      <1> 	cmp	eax, [FAT_BuffSector]
   728 0000BF8E 0F85EF010000        <1>         jne     loc_uc_load_fat_sectors
   729                              <1> 
   730                              <1> loc_update_fat16_cell:
   731                              <1> loc_update_fat16_buffer:
   732 0000BF94 81C3001C0900        <1> 	add	ebx, FAT_Buffer ; 26/02/2016
   733                              <1> 	;movzx	eax, word [ebx]
   734 0000BF9A 668B03              <1> 	mov	ax, [ebx]
   735                              <1> 	; 01/03/2016
   736 0000BF9D 89C2                <1> 	mov	edx, eax ; old value of the cluster
   737 0000BF9F A3[96600100]        <1> 	mov	[FAT_CurrentCluster], eax
   738 0000BFA4 8B0D[38630100]      <1> 	mov	ecx, [ClusterValue] ; 32 bits
   739 0000BFAA 66890B              <1> 	mov	[ebx], cx ; 16 bits !
   740                              <1> 
   741 0000BFAD C605[9A600100]02    <1> 	mov	byte [FAT_BuffValidData], 2
   742                              <1> 	
   743 0000BFB4 6683F802            <1> 	cmp	ax, 2
   744 0000BFB8 723A                <1> 	jb	short return_uc_fat_stc
   745 0000BFBA 3B05[A6600100]      <1> 	cmp	eax, [LastCluster]
   746 0000BFC0 7732                <1> 	ja	short return_uc_fat_stc
   747                              <1> 
   748                              <1> loc_fat_buffer_updated:
   749                              <1> 	; 01/03/2016
   750 0000BFC2 F8                  <1> 	clc
   751                              <1> loc_fat_buffer_stc_1:
   752 0000BFC3 9C                  <1> 	pushf
   753 0000BFC4 21C9                <1> 	and	ecx, ecx
   754 0000BFC6 7506                <1> 	jnz	short loc_fat_buffer_updated_1
   755                              <1> 
   756                              <1> 	; 01/03/2016 
   757                              <1> 	; new value of the cluster = 0 (free)
   758                              <1> 	; increase free(d) cluster count
   759 0000BFC8 FF05[A2600100]      <1> 	inc	dword [FAT_ClusterCounter]
   760                              <1> 
   761                              <1> loc_fat_buffer_updated_1: ; new value of the cluster > 0
   762 0000BFCE 09D2                <1> 	or	edx, edx ; 02/03/2016
   763 0000BFD0 7506                <1> 	jnz	short loc_fat_buffer_updated_2
   764                              <1> 	; old value of the cluster = 0 (it was free cluster)
   765                              <1> 	; decrease free(d) cluster count
   766 0000BFD2 FF0D[A2600100]      <1> 	dec	dword [FAT_ClusterCounter] ; it may be negative number
   767                              <1> 
   768                              <1> loc_fat_buffer_updated_2:
   769 0000BFD8 9D                  <1> 	popf
   770 0000BFD9 C3                  <1> 	retn
   771                              <1> 
   772                              <1> loc_uc_save_fat_buffer:
   773                              <1> 	; byte [FAT_BuffValidData] = 2 
   774 0000BFDA E8D4010000          <1> 	call	save_fat_buffer
   775 0000BFDF 0F8297010000        <1>         jc      loc_fat_sectors_rw_error2
   776                              <1> 	;mov	byte [FAT_BuffValidData], 1
   777 0000BFE5 A1[96600100]        <1> 	mov	eax, [FAT_CurrentCluster]
   778                              <1> 	;mov	ecx, [ClusterValue]
   779                              <1> 	;jmp	short loc_update_cluster_check_fat_buffer
   780 0000BFEA 8A1E                <1> 	mov	bl, [esi+LD_Name] ; 01/03/2016
   781 0000BFEC E927FFFFFF          <1>         jmp     loc_uc_reset_fat_buffer_validation
   782                              <1> 
   783                              <1> update_cluster_inv_data:
   784                              <1> 	;mov	eax, 0Dh
   785 0000BFF1 B00D                <1> 	mov	al, 0Dh  ; Invalid Data
   786 0000BFF3 C3                  <1> 	retn 
   787                              <1> 
   788                              <1> return_uc_fat_stc:
   789                              <1> 	; 01/03/2016
   790 0000BFF4 31C0                <1> 	xor	eax, eax
   791 0000BFF6 F9                  <1> 	stc
   792 0000BFF7 EBCA                <1> 	jmp	short loc_fat_buffer_stc_1
   793                              <1> 
   794                              <1> update_fat12_cluster:
   795                              <1> pass_uc_fat12_errc:
   796                              <1> 	;sub	edx, edx
   797 0000BFF9 BB00040000          <1> 	mov	ebx, 400h ;1024
   798 0000BFFE F7F3                <1> 	div	ebx
   799                              <1> 	; EAX = Count of 3 FAT sectors
   800                              <1> 	; DX = Cluster offset in FAT buffer
   801 0000C000 66B90300            <1> 	mov	cx, 3
   802 0000C004 6689C3              <1> 	mov	bx, ax
   803 0000C007 6689C8              <1> 	mov	ax, cx ; 3
   804 0000C00A 66F7E2              <1> 	mul	dx     ; Multiply by 3
   805 0000C00D 66D1E8              <1> 	shr	ax, 1  ; Divide by 2
   806 0000C010 6693                <1> 	xchg	bx, ax
   807                              <1> 	; EAX = Count of 3 FAT sectors
   808                              <1> 	; EBX = Byte Offset in FAT buffer   
   809 0000C012 66F7E1              <1> 	mul	cx  ; 3 * AX
   810                              <1> 	; EAX = FAT Beginning Sector
   811                              <1> 	; EDX = 0
   812 0000C015 8A0D[9A600100]      <1> 	mov	cl, [FAT_BuffValidData]
   813                              <1> 	; TRDOS v1 has a FATal bug here ! 
   814                              <1> 	; (it does not have 'cmp cl, 2' instruction here !
   815                              <1> 	;  while 'jne' is existing !)
   816 0000C01B 80F902              <1> 	cmp	cl, 2 ; 2 = dirty buffer (must be written to disk)
   817 0000C01E 750A                <1> 	jne	short loc_uc_check_fat12_buff_sector_load
   818                              <1> 
   819                              <1> loc_uc_check_fat12_buff_sector_save:
   820 0000C020 3B05[9E600100]      <1> 	cmp	eax, [FAT_BuffSector]
   821 0000C026 75B2                <1>         jne     short loc_uc_save_fat_buffer
   822 0000C028 EB15                <1> 	jmp	short loc_update_fat12_cell
   823                              <1> 
   824                              <1> loc_uc_check_fat12_buff_sector_load:
   825 0000C02A 80F901              <1> 	cmp	cl, 1 ; byte ptr [FAT_BuffValidData]
   826 0000C02D 0F8550010000        <1>         jne     loc_uc_load_fat_sectors
   827 0000C033 3B05[9E600100]      <1> 	cmp	eax, [FAT_BuffSector]
   828 0000C039 0F8544010000        <1>         jne     loc_uc_load_fat_sectors
   829                              <1> 
   830                              <1> loc_update_fat12_cell:
   831 0000C03F 81C3001C0900        <1> 	add	ebx, FAT_Buffer ; 26/02/2016
   832 0000C045 668B0D[96600100]    <1> 	mov	cx, [FAT_CurrentCluster]
   833 0000C04C 66D1E9              <1> 	shr	cx, 1
   834 0000C04F 668B03              <1> 	mov	ax, [ebx]
   835 0000C052 6689C2              <1> 	mov	dx, ax
   836 0000C055 7344                <1> 	jnc	short uc_fat12_nc_even
   837                              <1> 
   838 0000C057 6683E00F            <1> 	and	ax, 0Fh
   839 0000C05B 8B0D[38630100]      <1> 	mov	ecx, [ClusterValue] ; 32 bits
   840 0000C061 66C1E104            <1> 	shl	cx, 4
   841 0000C065 6609C1              <1> 	or	cx, ax
   842 0000C068 6689D0              <1> 	mov	ax, dx
   843 0000C06B 66890B              <1> 	mov	[ebx], cx  ; 16 bits !
   844 0000C06E 66C1E804            <1> 	shr	ax, 4 ; al(bit4..7)+ah(bit0..7)
   845                              <1> 
   846                              <1> update_fat12_buffer:
   847 0000C072 A3[96600100]        <1> 	mov	[FAT_CurrentCluster], eax
   848 0000C077 89C2                <1> 	mov	edx, eax ; 01/03/2016
   849 0000C079 C605[9A600100]02    <1> 	mov	byte [FAT_BuffValidData], 2
   850 0000C080 6683F802            <1> 	cmp	ax, 2
   851 0000C084 0F826AFFFFFF        <1>         jb      return_uc_fat_stc
   852 0000C08A 3B05[A6600100]      <1> 	cmp	eax, [LastCluster]
   853 0000C090 0F875EFFFFFF        <1>         ja      return_uc_fat_stc
   854 0000C096 E927FFFFFF          <1>         jmp     loc_fat_buffer_updated
   855                              <1> 
   856                              <1> uc_fat12_nc_even:
   857 0000C09B 662500F0            <1> 	and	ax, 0F000h
   858 0000C09F 8B0D[38630100]      <1> 	mov	ecx, [ClusterValue] ; 32 bits
   859 0000C0A5 80E50F              <1> 	and	ch, 0Fh
   860 0000C0A8 6609C1              <1> 	or	cx, ax
   861 0000C0AB 6689D0              <1> 	mov	ax, dx
   862 0000C0AE 66890B              <1> 	mov	[ebx], cx ; 16 bits !
   863 0000C0B1 80E40F              <1> 	and	ah, 0Fh ; al(bit0..7)+ah(bit0..3)
   864 0000C0B4 EBBC                <1> 	jmp	short update_fat12_buffer
   865                              <1> 
   866                              <1> update_fat32_cluster:
   867 0000C0B6 8B4E78              <1> 	mov	ecx, [esi+LD_Clusters]
   868 0000C0B9 41                  <1> 	inc	ecx
   869 0000C0BA 890D[A6600100]      <1> 	mov	[LastCluster], ecx
   870                              <1> 
   871 0000C0C0 39C8                <1> 	cmp	eax, ecx
   872 0000C0C2 0F872CFFFFFF        <1>         ja      return_uc_fat_stc
   873                              <1> 
   874                              <1> pass_uc_fat32_errc:
   875                              <1> 	;sub	edx, edx
   876 0000C0C8 BB80010000          <1> 	mov	ebx, 180h ;384
   877 0000C0CD F7F3                <1> 	div	ebx
   878                              <1> 	; EAX = Count of 3 FAT sectors
   879                              <1> 	; DX = Cluster offset in FAT buffer
   880 0000C0CF 89D3                <1> 	mov	ebx, edx
   881 0000C0D1 C1E302              <1> 	shl	ebx, 2 ; Multiply by 4
   882 0000C0D4 BA03000000          <1> 	mov	edx, 3	
   883 0000C0D9 F7E2                <1> 	mul	edx
   884                              <1> 	; EBX = Cluster Offset in FAT buffer
   885                              <1> 	; EAX = FAT Sector
   886                              <1> 	; EDX = 0
   887 0000C0DB 8A0D[9A600100]      <1> 	mov	cl, [FAT_BuffValidData]
   888 0000C0E1 80F902              <1> 	cmp	cl, 2
   889 0000C0E4 750E                <1> 	jne	short loc_uc_check_fat32_buff_sector_load
   890                              <1> 
   891                              <1> loc_uc_check_fat32_buff_sector_save:
   892 0000C0E6 3B05[9E600100]      <1> 	cmp	eax, [FAT_BuffSector]
   893 0000C0EC 0F85E8FEFFFF        <1>         jne     loc_uc_save_fat_buffer
   894 0000C0F2 EB11                <1> 	jmp	short loc_update_fat32_cell
   895                              <1> 
   896                              <1> loc_uc_check_fat32_buff_sector_load:
   897 0000C0F4 80F901              <1> 	cmp	cl, 1 ; byte [FAT_BuffValidData]
   898 0000C0F7 0F8586000000        <1>         jne     loc_uc_load_fat_sectors
   899 0000C0FD 3B05[9E600100]      <1> 	cmp	eax, [FAT_BuffSector]
   900 0000C103 757E                <1>         jne     loc_uc_load_fat_sectors
   901                              <1> 
   902                              <1> loc_update_fat32_cell:
   903                              <1> loc_update_fat32_buffer:
   904 0000C105 81C3001C0900        <1> 	add	ebx, FAT_Buffer ; 26/02/2016
   905 0000C10B 8B03                <1> 	mov	eax, [ebx]
   906 0000C10D 25FFFFFF0F          <1> 	and	eax, 0FFFFFFFh ; 28 bit cluster value
   907                              <1> 	
   908 0000C112 8B15[96600100]      <1> 	mov	edx, [FAT_CurrentCluster] ; 01/03/2016
   909                              <1> 
   910 0000C118 A3[96600100]        <1> 	mov 	[FAT_CurrentCluster], eax
   911 0000C11D 8B0D[38630100]      <1> 	mov	ecx, [ClusterValue]
   912 0000C123 890B                <1> 	mov	[ebx], ecx ; 29/02/2016 
   913                              <1> 
   914 0000C125 C605[9A600100]02    <1> 	mov	byte [FAT_BuffValidData], 2
   915                              <1> 
   916                              <1> 	; 01/03/2016
   917 0000C12C 21C0                <1> 	and	eax, eax ; was it free cluster ?
   918 0000C12E 7514                <1> 	jnz	short loc_upd_fat32_c0
   919                              <1> 
   920                              <1> 	;or	ecx, ecx ; it will be left free ?!
   921                              <1> 	;jz	short loc_upd_fat32_c3
   922                              <1> 
   923 0000C130 3B563E              <1> 	cmp	edx, [esi+LD_BPB+BPB_Reserved+4] ; First free cluster
   924 0000C133 7520                <1> 	jne	short loc_upd_fat32_c3
   925                              <1> 
   926 0000C135 3B15[A6600100]      <1> 	cmp	edx, [LastCluster]
   927 0000C13B 7207                <1> 	jb	short loc_upd_fat32_c0
   928                              <1> 
   929 0000C13D BA02000000          <1> 	mov	edx, 2 ; rewind !
   930 0000C142 EB0E                <1> 	jmp	short loc_upd_fat32_c2
   931                              <1> 
   932                              <1> loc_upd_fat32_c0:
   933 0000C144 FF463E              <1> 	inc	dword [esi+LD_BPB+BPB_Reserved+4] ; set it to next cluster		
   934 0000C147 EB0C                <1> 	jmp	short loc_upd_fat32_c3
   935                              <1> 
   936                              <1> loc_upd_fat32_c1:
   937 0000C149 09C9                <1> 	or	ecx, ecx ; will it be free cluster ?
   938 0000C14B 7508                <1> 	jnz	short loc_upd_fat32_c3
   939                              <1> 
   940 0000C14D 3B563E              <1> 	cmp	edx, [esi+LD_BPB+BPB_Reserved+4] ; First free cluster
   941 0000C150 7303                <1> 	jnb	short loc_upd_fat32_c3
   942                              <1> 
   943                              <1> loc_upd_fat32_c2:	
   944 0000C152 89563E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], edx			
   945                              <1> 
   946                              <1> loc_upd_fat32_c3:
   947 0000C155 89C2                <1> 	mov	edx, eax
   948                              <1> 
   949                              <1> loc_upd_fat32_c4:
   950 0000C157 83F802              <1> 	cmp	eax, 2
   951 0000C15A 0F8294FEFFFF        <1>         jb      return_uc_fat_stc
   952                              <1> 
   953                              <1> pass_uc_fat32_c_zero_check_2:
   954 0000C160 3B05[A6600100]      <1> 	cmp	eax, [LastCluster]
   955 0000C166 0F8788FEFFFF        <1>         ja      return_uc_fat_stc
   956                              <1> 	
   957 0000C16C E951FEFFFF          <1> 	jmp     loc_fat_buffer_updated
   958                              <1> 
   959                              <1> loc_fat_sectors_rw_error1:
   960                              <1> 	;mov	byte [FAT_BuffValidData], 0
   961                              <1> 	; 23/10/2016 (15h -> 17)
   962                              <1> 	; 23/03/2016
   963 0000C171 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error
   964 0000C176 8825[9A600100]      <1> 	mov	[FAT_BuffValidData], ah ; 0
   965                              <1> 
   966                              <1> loc_fat_sectors_rw_error2:
   967                              <1> 	;mov	eax, error code
   968                              <1> 	;mov	edx, 0
   969 0000C17C 8B0D[38630100]      <1> 	mov	ecx, [ClusterValue]
   970 0000C182 C3                  <1> 	retn
   971                              <1> 
   972                              <1> loc_uc_load_fat_sectors:
   973 0000C183 A3[9E600100]        <1> 	mov	[FAT_BuffSector], eax
   974                              <1> 
   975                              <1> load_uc_fat_sectors_zero:
   976 0000C188 034660              <1> 	add	eax, [esi+LD_FATBegin]
   977 0000C18B BB001C0900          <1> 	mov	ebx, FAT_Buffer
   978 0000C190 B903000000          <1> 	mov	ecx, 3
   979 0000C195 E8C2360000          <1> 	call	disk_read
   980 0000C19A 72D5                <1> 	jc	short loc_fat_sectors_rw_error1
   981                              <1> 
   982 0000C19C C605[9A600100]01    <1>         mov     byte [FAT_BuffValidData], 1
   983 0000C1A3 A1[96600100]        <1> 	mov 	eax, [FAT_CurrentCluster]
   984 0000C1A8 8B0D[38630100]      <1> 	mov	ecx, [ClusterValue]
   985 0000C1AE E972FDFFFF          <1>         jmp     loc_update_cluster_check_fat_type
   986                              <1> 
   987                              <1> save_fat_buffer:
   988                              <1> 	; 15/10/2016
   989                              <1> 	; 01/03/2016
   990                              <1> 	; 22/02/2016 (TRDOS 386 =  TRDOS v2.0)
   991                              <1> 	; 11/08/2011
   992                              <1> 	; 09/02/2005 
   993                              <1> 	; INPUT ->
   994                              <1> 	;	None
   995                              <1> 	; OUTPUT ->
   996                              <1> 	;	cf = 0 -> OK.
   997                              <1> 	;	cf = 1 -> error code in AL (EAX)
   998                              <1> 	;
   999                              <1> 	;	EBX = FAT_Buffer address
  1000                              <1> 	;
  1001                              <1> 	; (EAX, EDX, ECX will be modified)
  1002                              <1> 
  1003                              <1> 	;cmp	byte [FAT_BuffValidData], 2 
  1004                              <1> 	;je	short loc_save_fat_buff
  1005                              <1> 
  1006                              <1> ;loc_save_fat_buffer_retn:
  1007                              <1> ;	xor	eax, eax
  1008                              <1> ;	retn
  1009                              <1> 
  1010                              <1> loc_save_fat_buff:
  1011 0000C1B3 31D2                <1> 	xor	edx, edx
  1012 0000C1B5 8A35[9B600100]      <1> 	mov	dh, [FAT_BuffDrvName]
  1013 0000C1BB 80FE41              <1> 	cmp	dh, 'A'
  1014 0000C1BE 722E                <1> 	jb	short loc_save_fat_buffer_inv_data_retn
  1015 0000C1C0 80EE41              <1> 	sub	dh, 'A'
  1016 0000C1C3 56                  <1> 	push	esi ; *
  1017 0000C1C4 BE00010900          <1>         mov     esi, Logical_DOSDisks
  1018 0000C1C9 01D6                <1> 	add	esi, edx
  1019                              <1> 	
  1020 0000C1CB 8A5603              <1> 	mov	dl, [esi+LD_FATType]
  1021 0000C1CE 20D2                <1> 	and	dl, dl
  1022 0000C1D0 741B                <1> 	jz	short loc_save_fat_buffer_inv_data_pop_retn 
  1023                              <1> 
  1024 0000C1D2 A1[9E600100]        <1> 	mov	eax, [FAT_BuffSector]
  1025 0000C1D7 80FA02              <1> 	cmp	dl, 2
  1026 0000C1DA 770A                <1> 	ja	short loc_save_fat32_buff
  1027                              <1> 
  1028                              <1> loc_save_fat_12_16_buff:
  1029                              <1> 	; 01/03/2016
  1030                              <1> 	; TRDOS v1 has a FATal bug here!
  1031                              <1> 	; Correct code: mov dx, word ptr [FAT_BuffSector]+2
  1032                              <1> 	; (DX:AX in TRDOS v1 -> EAX in TRDOS v2)
  1033                              <1> 	;
  1034 0000C1DC 0FB74E1C            <1> 	movzx	ecx, word [esi+LD_BPB+FATSecs] 
  1035 0000C1E0 29C1                <1> 	sub	ecx, eax
  1036                              <1> 	; TRDOS v1 has a bug here... ('pop esi' was forgotten!)
  1037                              <1> 	;jna	short loc_save_fat_buffer_inv_data_retn ; wrong addr!
  1038 0000C1E2 7609                <1> 	jna	short loc_save_fat_buffer_inv_data_pop_retn ; correct addr.
  1039 0000C1E4 EB15                <1> 	jmp	short loc_save_fat_buffer_check_rs3
  1040                              <1> 
  1041                              <1> loc_save_fat32_buff:
  1042 0000C1E6 8B4E2A              <1> 	mov	ecx, [esi+LD_BPB+FAT32_FAT_Size]
  1043 0000C1E9 29C1                <1> 	sub	ecx, eax
  1044 0000C1EB 770E                <1> 	ja	short loc_save_fat_buffer_check_rs3
  1045                              <1> 
  1046                              <1> loc_save_fat_buffer_inv_data_pop_retn:
  1047 0000C1ED 5E                  <1> 	pop	esi ; *
  1048                              <1> loc_save_fat_buffer_inv_data_retn:
  1049 0000C1EE B80D000000          <1> 	mov	eax, 0Dh ; Invalid DATA
  1050 0000C1F3 C3                  <1> 	retn
  1051                              <1> 
  1052                              <1> loc_save_fat_buff_remain_sectors_3:
  1053 0000C1F4 B903000000          <1> 	mov	ecx, 3
  1054 0000C1F9 EB05                <1> 	jmp	short loc_save_fat_buff_continue
  1055                              <1> 
  1056                              <1> loc_save_fat_buffer_check_rs3:
  1057 0000C1FB 83F903              <1> 	cmp	ecx, 3
  1058 0000C1FE 77F4                <1> 	ja	short loc_save_fat_buff_remain_sectors_3
  1059                              <1> 
  1060                              <1> loc_save_fat_buff_continue:
  1061 0000C200 BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1062 0000C205 034660              <1> 	add	eax, [esi+LD_FATBegin]
  1063 0000C208 51                  <1> 	push	ecx
  1064 0000C209 E83F360000          <1> 	call	disk_write
  1065 0000C20E 59                  <1> 	pop	ecx
  1066 0000C20F 722B                <1> 	jc	short loc_save_FAT_buff_write_err
  1067                              <1> 	
  1068 0000C211 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1069 0000C215 7605                <1> 	jna	short loc_calc_2nd_fat12_16_addr
  1070                              <1> 
  1071                              <1> loc_calc_2nd_fat32_addr:
  1072 0000C217 8B462A              <1> 	mov	eax, [esi+LD_BPB+FAT32_FAT_Size]
  1073 0000C21A EB04                <1> 	jmp	short loc_calc_2nd_fat_addr
  1074                              <1> 
  1075                              <1> loc_calc_2nd_fat12_16_addr:
  1076 0000C21C 0FB7461C            <1> 	movzx	eax, word [esi+LD_BPB+FATSecs]
  1077                              <1> 
  1078                              <1> loc_calc_2nd_fat_addr:
  1079 0000C220 034660              <1> 	add	eax, [esi+LD_FATBegin]
  1080 0000C223 0305[9E600100]      <1> 	add	eax, [FAT_BuffSector]
  1081 0000C229 BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1082                              <1> 	; ecx = 1 to 3
  1083 0000C22E E81A360000          <1> 	call	disk_write
  1084 0000C233 7207                <1> 	jc	short loc_save_FAT_buff_write_err
  1085                              <1>  	; Valid  buffer (1 = valid but do not save)
  1086 0000C235 C605[9A600100]01    <1> 	mov	byte [FAT_BuffValidData], 1
  1087                              <1> 
  1088                              <1> loc_save_FAT_buff_write_err:
  1089 0000C23C 5E                  <1> 	pop	esi ; *
  1090 0000C23D BB001C0900          <1> 	mov	ebx, FAT_Buffer
  1091                              <1> 	; 15/10/2016 (1Dh -> 18)
  1092                              <1> 	; 23/03/2016 (1Dh)
  1093 0000C242 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error
  1094 0000C247 C3                  <1> 	retn
  1095                              <1> 
  1096                              <1> calculate_fat_freespace:
  1097                              <1> 	; 23/03/2016
  1098                              <1> 	; 02/03/2016
  1099                              <1> 	; 01/03/2016
  1100                              <1> 	; 29/02/2016
  1101                              <1> 	; 22/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1102                              <1> 	; 30/04/2011
  1103                              <1> 	; 03/04/2010
  1104                              <1> 	; 2005
  1105                              <1> 	; INPUT ->
  1106                              <1> 	;	EAX = Cluster count to be added or subtracted
  1107                              <1> 	; 	If BH = FFh, ESI = TR-DOS Logical Drive Description Table
  1108                              <1> 	; 	If BH < FFh, BH = TR-DOS Logical Drive Number
  1109                              <1> 	; 	BL: 
  1110                              <1> 	;	0 = Calculate, 1 = Add, 2 = Subtract, 3 = Get (Not Set/Calc)
  1111                              <1> 	; OUTPUT ->
  1112                              <1> 	;	EAX = Free Space in sectors
  1113                              <1> 	;	ESI = Logical Dos Drive Description Table address
  1114                              <1> 	;	BH = Logical Dos Drive Number (same with input value of BH)
  1115                              <1> 	;	BL = Type of operation (same with input value of BL)
  1116                              <1> 	;	ECX = 0 -> valid
  1117                              <1> 	;	ECX > 0 -> error or invalid
  1118                              <1> 	;	If EAX = FFFFFFFFh, it is 're-calculation needed'
  1119                              <1> 	;			          sign due to r/w error   
  1120                              <1> 
  1121 0000C248 66891D[3E630100]    <1> 	mov	[CFS_OPType], bx
  1122 0000C24F A3[40630100]        <1> 	mov	[CFS_CC], eax
  1123                              <1> 	
  1124 0000C254 80FFFF              <1> 	cmp	bh, 0FFh
  1125 0000C257 740B                <1> 	je	short pass_calculate_freespace_get_drive_dt_offset
  1126                              <1> 
  1127                              <1> loc_calculate_freespace_get_drive_dt_offset:     
  1128 0000C259 31C0                <1> 	xor	eax, eax
  1129 0000C25B 88FC                <1>         mov     ah, bh
  1130 0000C25D BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1131 0000C262 01C6                <1>         add     esi, eax
  1132                              <1> 
  1133                              <1> pass_calculate_freespace_get_drive_dt_offset:
  1134 0000C264 08DB                <1> 	or	bl, bl
  1135 0000C266 7435                <1> 	jz	short loc_reset_fcc
  1136                              <1> 	
  1137                              <1> loc_get_free_sectors:
  1138 0000C268 8B4674              <1> 	mov	eax, [esi+LD_FreeSectors]
  1139                              <1> 
  1140                              <1> 	;xor	ecx, ecx
  1141                              <1> 	;dec	ecx ; 0FFFFFFFFh
  1142                              <1> 	;cmp	eax, ecx ; 29/02/2016
  1143                              <1> 	;je	short loc_get_free_sectors_retn ; recalculation is needed!
  1144                              <1> 	
  1145                              <1> 	; 23/03/2016
  1146 0000C26B 8B4E70              <1> 	mov	ecx, [esi+LD_TotalSectors]
  1147 0000C26E 39C1                <1> 	cmp	ecx, eax ; Total sectors must be greater than Free sectors !
  1148 0000C270 7707                <1> 	ja	short loc_get_free_sectors_check_optype
  1149                              <1> 	
  1150 0000C272 31C0                <1> 	xor	eax, eax
  1151 0000C274 48                  <1> 	dec	eax ; 0FFFFFFFFh  ; recalculation is needed!
  1152 0000C275 894674              <1> 	mov	[esi+LD_FreeSectors], eax ; reset (for recalculation)
  1153                              <1> 		
  1154                              <1> loc_get_free_sectors_retn:
  1155 0000C278 C3                  <1> 	retn
  1156                              <1> 	
  1157                              <1> loc_get_free_sectors_check_optype:
  1158 0000C279 80FB03              <1> 	cmp	bl, 3
  1159 0000C27C 7203                <1> 	jb	short loc_set_fcc
  1160                              <1> 
  1161 0000C27E 29C9                <1> 	sub	ecx, ecx ; 0
  1162                              <1> 
  1163 0000C280 C3                  <1> 	retn	
  1164                              <1> 
  1165                              <1> loc_set_fcc:
  1166 0000C281 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1167 0000C285 0F87DF000000        <1>         ja      loc_update_FAT32_fs_info_fcc
  1168                              <1> 
  1169                              <1> 	;mov	eax, [esi+LD_FreeSectors]
  1170 0000C28B 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+SecPerClust]
  1171 0000C28F 29D2                <1> 	sub	edx, edx
  1172 0000C291 F7F1                <1> 	div	ecx
  1173                              <1> 	;or	dx, dx 
  1174                              <1> 	;	; DX -> Remain sectors < SecPerClust
  1175                              <1> 	;	; DX > 0 -> invalid free sector count
  1176                              <1> 	;jnz	short loc_reset_fcc 
  1177                              <1> 
  1178                              <1> ;pass_set_fcc_div32:
  1179 0000C293 A3[B7600100]        <1> 	mov	[FreeClusterCount], eax
  1180 0000C298 E988000000          <1>         jmp     loc_set_free_sectors_FAT12_FAT16
  1181                              <1> 
  1182                              <1> loc_reset_fcc:
  1183 0000C29D 31C0                <1> 	xor	eax, eax
  1184 0000C29F A3[B7600100]        <1> 	mov	[FreeClusterCount], eax ; 0
  1185 0000C2A4 8B5678              <1> 	mov	edx, [esi+LD_Clusters]
  1186 0000C2A7 42                  <1> 	inc	edx
  1187 0000C2A8 8915[A6600100]      <1> 	mov	[LastCluster], edx
  1188                              <1> 
  1189 0000C2AE 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1190 0000C2B2 7647                <1> 	jna	short loc_count_free_fat_clusters_0  
  1191                              <1> 
  1192 0000C2B4 48                  <1> 	dec	eax ; FFFFFFFFh
  1193 0000C2B5 A3[48630100]        <1> 	mov	[CFS_FAT32FC], eax
  1194                              <1> 
  1195                              <1> 	; 29/02/2016
  1196 0000C2BA 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; reset
  1197 0000C2BD 89463E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], eax ; reset
  1198                              <1> 	
  1199 0000C2C0 B802000000          <1> 	mov 	eax, 2
  1200                              <1> 
  1201                              <1> loc_count_fc_next_cluster_0:
  1202 0000C2C5 50                  <1> 	push	eax
  1203 0000C2C6 E801F9FFFF          <1> 	call	get_next_cluster
  1204 0000C2CB 7310                <1> 	jnc	short loc_check_fat32_ff_cluster
  1205 0000C2CD 09C0                <1> 	or	eax, eax
  1206 0000C2CF 741E                <1> 	jz	short pass_inc_cfs_fcc_0
  1207                              <1> 
  1208                              <1> loc_put_fcc_unknown_sign:
  1209 0000C2D1 58                  <1> 	pop	eax
  1210                              <1> 	; "Free count is Unknown" sign
  1211                              <1> 	;mov	dword [FreeClusterCount], 0FFFFFFFFh
  1212                              <1> 
  1213                              <1> 	; 29/02/2016
  1214                              <1> 	; Save Free Cluster Count value in FAT32 'BPB_Reserved' area
  1215                              <1> 	;mov	[esi+LD_BPB+BPB_Reserved], 0FFFFFFFFh ; unknown!
  1216 0000C2D2 8B15[48630100]      <1> 	mov	edx, [CFS_FAT32FC] ; First Free Cluster
  1217                              <1> 	; Save First Free Cluster value in FAT32 'BPB_Reserved+4' area
  1218 0000C2D8 89563E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], edx
  1219                              <1> 	
  1220 0000C2DB EB7D                <1>         jmp     loc_put_fcc_invalid_sign
  1221                              <1> 
  1222                              <1> loc_check_fat32_ff_cluster:
  1223 0000C2DD 09C0                <1> 	or	eax, eax
  1224 0000C2DF 750E                <1> 	jnz	short pass_inc_cfs_fcc_0
  1225 0000C2E1 58                  <1> 	pop	eax
  1226 0000C2E2 A3[48630100]        <1> 	mov	[CFS_FAT32FC], eax
  1227                              <1> 	;mov	dword [FreeClusterCount], 1
  1228 0000C2E7 FF05[B7600100]      <1> 	inc	dword [FreeClusterCount]
  1229 0000C2ED EB27                <1> 	jmp	short pass_inc_cfs_fcc_1
  1230                              <1> 
  1231                              <1> pass_inc_cfs_fcc_0:
  1232 0000C2EF 58                  <1> 	pop	eax
  1233                              <1> 
  1234                              <1> pass_inc_cfs_fcc_0c:
  1235 0000C2F0 40                  <1> 	inc	eax ; add eax, 1
  1236 0000C2F1 3B05[A6600100]      <1> 	cmp	eax, [LastCluster]
  1237 0000C2F7 76CC                <1> 	jna 	short loc_count_fc_next_cluster_0
  1238 0000C2F9 EB6F                <1> 	jmp	short loc_update_FAT32_fs_info_fcc
  1239                              <1> 
  1240                              <1> loc_count_free_fat_clusters_0:
  1241                              <1> 	;mov	eax, 2
  1242 0000C2FB B002                <1> 	mov	al, 2
  1243                              <1> 
  1244                              <1> loc_count_fc_next_cluster:
  1245 0000C2FD 50                  <1> 	push	eax
  1246 0000C2FE E8C9F8FFFF          <1> 	call	get_next_cluster
  1247 0000C303 720C                <1> 	jc	short loc_count_fcc_stc
  1248                              <1> 
  1249                              <1> loc_count_free_clusters_1:
  1250 0000C305 21C0                <1> 	and	eax, eax
  1251 0000C307 750C                <1> 	jnz	short pass_inc_cfs_fcc
  1252                              <1> 
  1253 0000C309 FF05[B7600100]      <1> 	inc	dword [FreeClusterCount]
  1254 0000C30F EB04                <1> 	jmp	short pass_inc_cfs_fcc
  1255                              <1> 
  1256                              <1> loc_count_fcc_stc:
  1257 0000C311 09C0                <1> 	or	eax, eax
  1258 0000C313 75BC                <1> 	jnz	short loc_put_fcc_unknown_sign ; 29/02/2016
  1259                              <1> 
  1260                              <1> pass_inc_cfs_fcc:
  1261 0000C315 58                  <1> 	pop	eax
  1262                              <1> 
  1263                              <1> pass_inc_cfs_fcc_1:
  1264 0000C316 40                  <1> 	inc	eax ; add eax, 1
  1265 0000C317 3B05[A6600100]      <1> 	cmp	eax, [LastCluster]
  1266 0000C31D 76DE                <1> 	jna	short loc_count_fc_next_cluster
  1267                              <1> 
  1268                              <1> loc_set_free_sectors:
  1269 0000C31F 807E0302            <1> 	cmp	byte [esi+LD_FATType], 2
  1270 0000C323 7745                <1> 	ja	short loc_update_FAT32_fs_info_fcc
  1271                              <1> 
  1272                              <1> loc_set_free_sectors_FAT12_FAT16:
  1273 0000C325 803D[3E630100]00    <1> 	cmp	byte [CFS_OPType], 0
  1274 0000C32C 761C                <1> 	jna	short pass_FAT_add_sub_fcc
  1275 0000C32E A1[40630100]        <1> 	mov	eax, [CFS_CC]
  1276 0000C333 803D[3E630100]01    <1> 	cmp	byte [CFS_OPType], 1
  1277 0000C33A 7708                <1> 	ja	short pass_FAT_add_fcc
  1278 0000C33C 0105[B7600100]      <1> 	add 	[FreeClusterCount], eax
  1279 0000C342 EB06                <1> 	jmp	short pass_FAT_add_sub_fcc
  1280                              <1> 
  1281                              <1> pass_FAT_add_fcc:
  1282 0000C344 2905[B7600100]      <1> 	sub	[FreeClusterCount], eax
  1283                              <1> 
  1284                              <1> pass_FAT_add_sub_fcc:
  1285 0000C34A 0FB64613            <1> 	movzx	eax, byte [esi+LD_BPB+SecPerClust]
  1286 0000C34E 8B15[B7600100]      <1> 	mov	edx, [FreeClusterCount]
  1287 0000C354 F7E2                <1> 	mul	edx
  1288                              <1> 
  1289 0000C356 31C9                <1> 	xor	ecx, ecx 
  1290 0000C358 EB05                <1> 	jmp	short loc_cfs_retn_params
  1291                              <1> 
  1292                              <1> loc_put_fcc_invalid_sign:
  1293 0000C35A 29C0                <1>        	sub	eax, eax ; 0
  1294 0000C35C 48                  <1> 	dec	eax ; FFFFFFFFh
  1295                              <1> loc_fat32_ffc_recalc_needed:
  1296 0000C35D 89C1                <1> 	mov	ecx, eax
  1297                              <1> 
  1298                              <1> loc_cfs_retn_params:
  1299 0000C35F 894674              <1> 	mov 	[esi+LD_FreeSectors], eax
  1300 0000C362 0FB71D[3E630100]    <1> 	movzx	ebx, word [CFS_OPType]
  1301 0000C369 C3                  <1> 	retn
  1302                              <1> 
  1303                              <1> loc_update_FAT32_fs_info_fcc:
  1304                              <1> loc_check_fcc_FSINFO_op:
  1305                              <1> 	; 29/02/2016
  1306                              <1> 	; EAX = Free cluster count (before this update) ; value from disk
  1307                              <1> 	; EDX = First Free Cluster (before this update) ; value from disk
  1308 0000C36A 803D[3E630100]01    <1> 	cmp	byte [CFS_OPType], 1
  1309 0000C371 7221                <1> 	jb	short loc_cfs_FAT32_get_rcalc_parms ; 0 = recalculated
  1310 0000C373 7406                <1> 	je	short loc_check_fcc_FSINFO_op1 ; 1 = add
  1311                              <1> loc_check_fcc_FSINFO_op2: ; subtract
  1312 0000C375 F71D[40630100]      <1> 	neg	dword [CFS_CC] ; prepare to subtract ; 2 = sub (add negative)
  1313                              <1> loc_check_fcc_FSINFO_op1:
  1314                              <1> 	; 01/03/2016
  1315 0000C37B 31D2                <1> 	xor	edx, edx ; 0
  1316 0000C37D 4A                  <1> 	dec	edx ; 0FFFFFFFFh
  1317 0000C37E 8B463A              <1> 	mov	eax, [esi+LD_BPB+BPB_Reserved]
  1318 0000C381 39D0                <1> 	cmp	eax, edx
  1319 0000C383 73D5                <1> 	jnb	short loc_put_fcc_invalid_sign
  1320 0000C385 0305[40630100]      <1>         add     eax, [CFS_CC] ; free cluster count on disk + current count
  1321 0000C38B 72CD                <1> 	jc	short loc_put_fcc_invalid_sign
  1322                              <1> 	
  1323 0000C38D A3[B7600100]        <1> 	mov	[FreeClusterCount], eax
  1324 0000C392 EB0E                <1> 	jmp	short loc_cfs_write_FSINFO_sector
  1325                              <1> 
  1326                              <1> loc_cfs_FAT32_get_rcalc_parms:
  1327 0000C394 8B15[48630100]      <1> 	mov	edx, [CFS_FAT32FC]
  1328 0000C39A A1[B7600100]        <1> 	mov	eax, [FreeClusterCount]
  1329 0000C39F 89563E              <1> 	mov	[esi+LD_BPB+BPB_Reserved+4], edx ; First Free Cluster
  1330                              <1> loc_cfs_write_FSINFO_sector:
  1331 0000C3A2 89463A              <1> 	mov	[esi+LD_BPB+BPB_Reserved], eax ; Free cluster count
  1332                              <1> 	; 01/03/2016
  1333 0000C3A5 E8AA000000          <1> 	call	set_fat32_fsinfo_sector_parms
  1334 0000C3AA 72AE                <1>         jc      short loc_put_fcc_invalid_sign
  1335                              <1> 
  1336                              <1> loc_set_FAT32_free_sectors:
  1337                              <1> 	; 29/02/2016
  1338                              <1> 	;mov	eax, [FreeClusterCount]
  1339                              <1> 	;mov	ecx, eax
  1340                              <1> 	;cmp	eax, 0FFFFFFFFh ; Invalid !
  1341                              <1> 	;je	short loc_cfs_retn_params
  1342                              <1> 	;
  1343 0000C3AC 8B0D[B7600100]      <1> 	mov	ecx, [FreeClusterCount]
  1344 0000C3B2 0FB64613            <1> 	movzx	eax, byte [esi+LD_BPB+SecPerClust]
  1345 0000C3B6 F7E1                <1> 	mul	ecx
  1346                              <1> 	; 29/02/2016
  1347 0000C3B8 31C9                <1> 	xor	ecx, ecx ; 0
  1348 0000C3BA 09D2                <1> 	or	edx, edx ; 0 ?
  1349 0000C3BC 759C                <1>         jnz     loc_put_fcc_invalid_sign
  1350 0000C3BE 394670              <1> 	cmp	[esi+LD_TotalSectors], eax ; Volume size in sectors
  1351 0000C3C1 7697                <1>         jna     short loc_put_fcc_invalid_sign
  1352                              <1> 	;
  1353                              <1> loc_set_FAT32_free_sectors_ok:
  1354 0000C3C3 31D2                <1> 	xor	edx, edx ; 0
  1355 0000C3C5 EB98                <1>         jmp     short loc_cfs_retn_params 
  1356                              <1> 	;
  1357                              <1> 
  1358                              <1> get_last_cluster:
  1359                              <1> 	; 22/10/2016
  1360                              <1> 	; 27/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1361                              <1> 	; 12/06/2010 (DRV_FAT.ASM, 'proc_get_last_custer')
  1362                              <1> 	; 06/06/2010
  1363                              <1> 	; INPUT ->
  1364                              <1> 	;	EAX = First Cluster Number
  1365                              <1> 	; 	ESI = Logical Dos Drive Parameters Table
  1366                              <1> 	; OUTPUT ->
  1367                              <1> 	;	cf = 0 -> No Error, EAX is valid
  1368                              <1> 	;	cf = 1 -> EAX > 0 -> Error
  1369                              <1> 	;	EAX = Last Cluster Number
  1370                              <1> 	;       ECX = Previous Cluster -just before the last cluster-
  1371                              <1> 	;       ; 22/10/2016
  1372                              <1> 	;	[glc_index] = cluster index number of the last cluster	
  1373                              <1> 	;
  1374                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
  1375                              <1> 
  1376 0000C3C7 89C1                <1> 	mov	ecx, eax
  1377                              <1> 
  1378 0000C3C9 C705[50630100]FFFF- <1> 	mov	dword [glc_index], 0FFFFFFFFh ; 22/10/2016	
  1378 0000C3D1 FFFF                <1>
  1379                              <1> 
  1380                              <1> loc_glc_get_next_cluster_1:
  1381 0000C3D3 890D[4C630100]      <1> 	mov	[glc_prevcluster], ecx
  1382                              <1>  	; 22/10/2016
  1383 0000C3D9 FF05[50630100]      <1> 	inc	dword [glc_index]
  1384                              <1> 
  1385                              <1> loc_glc_get_next_cluster_2:
  1386 0000C3DF E8E8F7FFFF          <1> 	call	get_next_cluster
  1387                              <1> 	; ecx = current/previous cluster 
  1388                              <1> 	; eax = next/last cluster
  1389 0000C3E4 73ED                <1> 	jnc	short loc_glc_get_next_cluster_1
  1390                              <1> 
  1391 0000C3E6 09C0                <1> 	or	eax, eax
  1392 0000C3E8 7509                <1> 	jnz	short loc_glc_stc_retn
  1393                              <1> 
  1394                              <1> 	; ecx = previous cluster
  1395 0000C3EA 89C8                <1>         mov	eax, ecx
  1396                              <1> 
  1397                              <1> 	; previous cluster becomes last cluster (ecx -> eax)
  1398                              <1> 	; previous of previous cluster becomes previous cluster (ecx)
  1399                              <1> 
  1400                              <1> loc_glc_prev_cluster_retn:
  1401 0000C3EC 8B0D[4C630100]      <1> 	mov	ecx, [glc_prevcluster] 
  1402 0000C3F2 C3                  <1> 	retn
  1403                              <1> 
  1404                              <1> loc_glc_stc_retn:
  1405 0000C3F3 F5                  <1> 	cmc	;stc
  1406 0000C3F4 EBF6                <1>         jmp	short loc_glc_prev_cluster_retn
  1407                              <1> 
  1408                              <1> truncate_cluster_chain:
  1409                              <1> 	; 01/03/2016
  1410                              <1> 	; 28/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1411                              <1> 	; 22/01/2011 (DRV_FAT.ASM, 'proc_truncate_cluster_chain')
  1412                              <1> 	; 11/09/2010
  1413                              <1> 	; INPUT ->
  1414                              <1> 	;	ESI = Logical dos drive description table address
  1415                              <1> 	;	EAX = First cluster to be truncated/unlinked 
  1416                              <1> 	; OUTPUT ->
  1417                              <1> 	;	ESI = Logical dos drive description table address
  1418                              <1> 	; 	ECX = Count of truncated/removed clusters
  1419                              <1> 	; 	CF = 0 -> EAX = Free sectors
  1420                              <1> 	; 	CF = 1 -> Error code in EAX (AL)
  1421                              <1> 
  1422                              <1> 	; NOTE: This procedure does not update lm date&time ! 
  1423                              <1> 
  1424                              <1> loc_truncate_cc:	
  1425 0000C3F6 31C9                <1> 	xor	ecx, ecx ; mov ecx, 0
  1426                              <1> 	;mov	byte [FAT_BuffValidData], 0
  1427 0000C3F8 890D[A2600100]      <1> 	mov	[FAT_ClusterCounter], ecx ; 0 ; reset
  1428                              <1> 
  1429                              <1> loc_tcc_unlink_clusters:
  1430 0000C3FE E8F3FAFFFF          <1> 	call	update_cluster
  1431                              <1> 	; EAX = Next Cluster
  1432                              <1> 	; ECX = Cluster Value
  1433                              <1> 	; Note:
  1434                              <1> 	; Returns count of unlinked clusters in
  1435                              <1> 	; dword ptr FAT_ClusterCounter
  1436 0000C403 73F9                <1> 	jnc short loc_tcc_unlink_clusters
  1437                              <1> 
  1438                              <1> pass_tcc_unlink_clusters:
  1439 0000C405 A2[57630100]        <1> 	mov	byte [TCC_FATErr], al
  1440 0000C40A 803D[9A600100]02    <1> 	cmp	byte [FAT_BuffValidData], 2
  1441 0000C411 750E                <1> 	jne	short loc_tcc_calculate_FAT_freespace
  1442 0000C413 E89BFDFFFF          <1> 	call	save_fat_buffer
  1443 0000C418 7307                <1> 	jnc	short loc_tcc_calculate_FAT_freespace
  1444 0000C41A A2[57630100]        <1> 	mov	byte [TCC_FATErr], al ; Error
  1445                              <1> 	;mov	byte [FAT_BuffValidData], 0
  1446                              <1> 
  1447                              <1> 	; 01/03/2016
  1448 0000C41F EB12                <1> 	jmp	short loc_tcc_recalculate_FAT_freespace
  1449                              <1> 
  1450                              <1> loc_tcc_calculate_FAT_freespace:
  1451 0000C421 A1[A2600100]        <1> 	mov	eax, [FAT_ClusterCounter] ; signed (+-) number
  1452 0000C426 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> ESI = Dos drv desc. table
  1453                              <1> 			   ; BL = 1 -> add cluster
  1454 0000C42A E819FEFFFF          <1> 	call	calculate_fat_freespace
  1455 0000C42F 21C9                <1> 	and	ecx, ecx ; cx = 0 -> valid free sector count
  1456 0000C431 7409                <1> 	jz	short pass_truncate_cc_recalc_FAT_freespace
  1457                              <1> 
  1458                              <1> loc_tcc_recalculate_FAT_freespace:
  1459 0000C433 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate !
  1460 0000C437 E80CFEFFFF          <1> 	call	calculate_fat_freespace
  1461                              <1>               
  1462                              <1> loc_tcc_calculate_FAT_freespace_err:
  1463                              <1> pass_truncate_cc_recalc_FAT_freespace:
  1464 0000C43C 8B0D[A2600100]      <1> 	mov	ecx, [FAT_ClusterCounter]
  1465                              <1> 
  1466 0000C442 803D[57630100]00    <1> 	cmp	byte [TCC_FATErr], 0
  1467 0000C449 7608                <1> 	jna	short loc_tcc_unlink_clusters_retn
  1468                              <1> 
  1469                              <1> loc_tcc_unlink_clusters_error:
  1470 0000C44B 0FB605[57630100]    <1> 	movzx	eax, byte [TCC_FATErr]
  1471 0000C452 F9                  <1> 	stc
  1472                              <1> loc_tcc_unlink_clusters_retn:
  1473 0000C453 C3                  <1> 	retn
  1474                              <1> 
  1475                              <1> set_fat32_fsinfo_sector_parms:
  1476                              <1> 	; 15/10/2016
  1477                              <1> 	; 23/03/2016
  1478                              <1> 	; 29/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1479                              <1> 	; INPUT ->
  1480                              <1> 	;	ESI = Logical dos drive description table address
  1481                              <1> 	;	[esi+LD_BPB+BPB_Reserved] = Free Cluster Count
  1482                              <1> 	;	[esi+LD_BPB+BPB_Reserved+4] = First Free Cluster 
  1483                              <1> 	; OUTPUT ->
  1484                              <1> 	;	ESI = Logical dos drive description table address
  1485                              <1> 	; 	CF = 0 -> OK..
  1486                              <1> 	; 	CF = 1 -> Error code in EAX (AL)
  1487                              <1> 	;
  1488                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX)
  1489                              <1> 
  1490 0000C454 E824000000          <1> 	call	get_fat32_fsinfo_sector_parms
  1491 0000C459 7221                <1> 	jc	short update_fat32_fsinfo_sector_retn
  1492                              <1> 
  1493 0000C45B 8B463A              <1> 	mov	eax, [esi+LD_BPB+BPB_Reserved] ; Free Cluster Count
  1494 0000C45E 8B563E              <1> 	mov	edx, [esi+LD_BPB+BPB_Reserved+4] ; First free Cluster	
  1495                              <1> 
  1496                              <1>         ;mov	ebx, DOSBootSectorBuff
  1497 0000C461 8983E8010000        <1> 	mov	[ebx+488], eax
  1498 0000C467 8993EC010000        <1> 	mov	[ebx+492], edx	
  1499                              <1> 
  1500 0000C46D A1[44630100]        <1> 	mov	eax, [CFS_FAT32FSINFOSEC]
  1501 0000C472 B901000000          <1> 	mov	ecx, 1
  1502 0000C477 E8D1330000          <1> 	call	disk_write
  1503                              <1> 	;jnc     short update_fat32_fsinfo_sector_retn
  1504                              <1> 
  1505                              <1> 	; 15/10/2016 (1Dh -> 18)
  1506                              <1> 	; 23/03/2016 (1Dh)
  1507                              <1> 	;mov	eax, 18 ; Drive not ready or write error
  1508                              <1> 
  1509                              <1> update_fat32_fsinfo_sector_retn:
  1510 0000C47C C3                  <1> 	retn
  1511                              <1> 
  1512                              <1> get_fat32_fsinfo_sector_parms:
  1513                              <1> 	; 15/10/2016
  1514                              <1> 	; 23/03/2016
  1515                              <1> 	; 01/03/2016
  1516                              <1> 	; 29/02/2016 (TRDOS 386 =  TRDOS v2.0)
  1517                              <1> 	; INPUT ->
  1518                              <1> 	;	ESI = Logical dos drive description table address
  1519                              <1> 	; OUTPUT ->
  1520                              <1> 	;	ESI = Logical dos drive description table address
  1521                              <1> 	;	EBX = FSINFO sector buffer address (DOSBootSectorBuff)	
  1522                              <1> 	;	CF = 0 -> OK..
  1523                              <1> 	;	   EAX = FsInfo sector address
  1524                              <1> 	;	   ECX = Free cluster count
  1525                              <1> 	;	   EDX = First free cluster 	
  1526                              <1> 	;	CF = 1 -> Error code in AL (EAX)
  1527                              <1> 	;	   EBX = 0
  1528                              <1> 	;	
  1529                              <1> 	;	[CFS_FAT32FSINFOSEC] = FAT32 FSINFO sector address
  1530                              <1>         ;
  1531                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX)
  1532                              <1> 
  1533 0000C47D 0FB74636            <1> 	movzx	eax, word [esi+LD_BPB+FAT32_FSInfoSec]
  1534 0000C481 03466C              <1> 	add	eax, [esi+LD_StartSector]
  1535 0000C484 A3[44630100]        <1> 	mov	[CFS_FAT32FSINFOSEC], eax
  1536                              <1> 	
  1537 0000C489 BB[965E0100]        <1>         mov     ebx, DOSBootSectorBuff
  1538 0000C48E B901000000          <1> 	mov	ecx, 1
  1539 0000C493 E8C4330000          <1> 	call	disk_read
  1540 0000C498 7232                <1> 	jc	short loc_read_FAT32_fsinfo_sec_err
  1541                              <1> 
  1542 0000C49A BB[965E0100]        <1> 	mov	ebx, DOSBootSectorBuff
  1543                              <1> 
  1544 0000C49F 813B52526141        <1> 	cmp	dword [ebx], 41615252h
  1545 0000C4A5 751E                <1> 	jne	short loc_read_FAT32_fsinfo_sec_stc
  1546                              <1> 
  1547 0000C4A7 81BBE4010000727241- <1> 	cmp	dword [ebx+484], 61417272h
  1547 0000C4B0 61                  <1>
  1548 0000C4B1 7512                <1> 	jne	short loc_read_FAT32_fsinfo_sec_stc
  1549                              <1> 
  1550 0000C4B3 A1[44630100]        <1> 	mov	eax, [CFS_FAT32FSINFOSEC]
  1551 0000C4B8 8B8BE8010000        <1> 	mov	ecx, [ebx+488] ; free cluster count
  1552 0000C4BE 8B93EC010000        <1> 	mov	edx, [ebx+492] ; first (next) free cluster	
  1553                              <1> 
  1554 0000C4C4 C3                  <1> 	retn
  1555                              <1> 
  1556                              <1> loc_read_FAT32_fsinfo_sec_stc: 
  1557                              <1> 	; 15/10/2016 (0Bh -> 28)
  1558 0000C4C5 B81C000000          <1> 	mov	eax, 28 ; Invalid format!
  1559 0000C4CA EB05                <1> 	jmp	short loc_read_FAT32_fsinfo_sec_stc_retn
  1560                              <1> 
  1561                              <1> loc_read_FAT32_fsinfo_sec_err:
  1562                              <1> 	; 15/10/2016 (15h -> 17)
  1563                              <1> 	; 23/03/2016 (15h)
  1564 0000C4CC B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error
  1565                              <1> 
  1566                              <1> loc_read_FAT32_fsinfo_sec_stc_retn:
  1567 0000C4D1 29DB                <1> 	sub	ebx, ebx ; 0
  1568 0000C4D3 F9                  <1> 	stc
  1569 0000C4D4 C3                  <1> 	retn
  1570                              <1> 
  1571                              <1> add_new_cluster:
  1572                              <1> 	; 15/10/2016
  1573                              <1> 	; 16/05/2016
  1574                              <1> 	; 18/03/2016, 24/03/2016
  1575                              <1> 	; 11/03/2016 (TRDOS 386 =  TRDOS v2.0)
  1576                              <1> 	; 30/07/2011 (DRV_FAT.ASM)
  1577                              <1> 	; 11/09/2010
  1578                              <1> 	; INPUT ->
  1579                              <1> 	;	ESI = Logical dos drv desc. table address
  1580                              <1> 	;	EAX = Last cluster
  1581                              <1> 	; OUTPUT ->
  1582                              <1> 	;	ESI = Logical dos drv desc. table address
  1583                              <1> 	;	EAX = New Last cluster (next cluster)
  1584                              <1> 	;	cf = 1 -> error code in EAX (AL)
  1585                              <1> 	;	cf = 1 -> DX = sectors per cluster
  1586                              <1> 	;	ECX = Free sectors
  1587                              <1> 	; NOTE:
  1588                              <1> 	; This procedure does not update lm date&time !
  1589                              <1> 	;
  1590                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX, EDI)
  1591                              <1> 	;
  1592                              <1> 
  1593 0000C4D5 A3[74640100]        <1> 	mov	[FAT_anc_LCluster], eax
  1594                              <1> 	
  1595 0000C4DA E844F9FFFF          <1> 	call	get_first_free_cluster
  1596 0000C4DF 720B                <1> 	jc	short loc_add_new_cluster_retn
  1597                              <1> 	; EAX >= 2 and EAX < FFFFFFFFh is valid
  1598                              <1> 
  1599 0000C4E1 89C2                <1> 	mov	edx, eax
  1600                              <1> 
  1601 0000C4E3 42                  <1> 	inc	edx
  1602                              <1> 	;jnz	short loc_add_new_cluster_check_ffc_eax
  1603 0000C4E4 7516                <1> 	jnz	short loc_add_new_cluster_save_fcc
  1604                              <1> 
  1605                              <1> loc_add_new_cluster_no_disk_space_retn:
  1606 0000C4E6 B827000000          <1> 	mov	eax, 27h ; MSDOS err => insufficient disk space
  1607                              <1> loc_add_new_cluster_stc_retn:
  1608 0000C4EB F9                  <1> 	stc
  1609                              <1> loc_add_new_cluster_retn:
  1610 0000C4EC 0FB65E13            <1> 	movzx	ebx, byte [esi+LD_BPB+SecPerClust]
  1611 0000C4F0 8B4E74              <1> 	mov	ecx, [esi+LD_FreeSectors]
  1612                              <1> 	;xor	edx, edx
  1613                              <1> 	;stc
  1614 0000C4F3 C3                  <1> 	retn
  1615                              <1> 
  1616                              <1> loc_anc_invalid_format_stc_retn:
  1617 0000C4F4 F9                  <1> 	stc
  1618                              <1> loc_add_new_cluster_invalid_format_retn:
  1619                              <1> 	; 15/10/2016 (0Bh -> 28)
  1620 0000C4F5 B81C000000          <1> 	mov	eax, 28 ; Invalid format
  1621 0000C4FA EBF0                <1> 	jmp	short loc_add_new_cluster_retn 
  1622                              <1> 
  1623                              <1> ;loc_add_new_cluster_check_ffc_eax:
  1624                              <1> ;	cmp	eax, 2
  1625                              <1> ;	jb	short loc_add_new_cluster_invalid_format_retn
  1626                              <1> 
  1627                              <1> loc_add_new_cluster_save_fcc:  
  1628 0000C4FC A3[78640100]        <1> 	mov	[FAT_anc_FFCluster], eax
  1629                              <1> 
  1630 0000C501 83E802              <1> 	sub	eax, 2
  1631 0000C504 0FB65E13            <1>         movzx   ebx, byte [esi+LD_BPB+SecPerClust]
  1632 0000C508 F7E3                <1> 	mul	ebx
  1633 0000C50A 09D2                <1> 	or	edx, edx
  1634 0000C50C 75E6                <1> 	jnz	short loc_anc_invalid_format_stc_retn
  1635                              <1> 
  1636                              <1> loc_add_new_cluster_allocate_cluster:
  1637                              <1> 	; 18/03/2016
  1638 0000C50E 92                  <1> 	xchg	edx, eax ; eax = 0
  1639                              <1> 	; 16/05/2016
  1640                              <1> 	;cmp	[ClusterBuffer_Valid], al ; 0
  1641                              <1> 	;jna	short loc_anc_clear_cluster_buffer
  1642                              <1> 	;; 'copy' command, 
  1643                              <1> 	;; writing destination file clust after reading source file clust
  1644                              <1> 	;mov	[ClusterBuffer_Valid], al ; 0 ; reset
  1645                              <1> 	;jmp	short loc_add_new_cluster_write_nc_to_disk
  1646                              <1> 
  1647                              <1> loc_anc_clear_cluster_buffer:
  1648                              <1> 	; 11/03/2016
  1649                              <1> 	; Clear buffer
  1650 0000C50F BF00000700          <1> 	mov	edi, Cluster_Buffer ; 70000h (for current TRDOS 386 version)
  1651 0000C514 89D9                <1> 	mov	ecx, ebx ; sector count
  1652 0000C516 C1E107              <1> 	shl	ecx, 7 ; 1 sector = 512 bytes -> 128 double words
  1653                              <1> 	;xor	eax, eax ; 0
  1654 0000C519 F3AB                <1> 	rep	stosd
  1655                              <1> 
  1656                              <1> loc_add_new_cluster_write_nc_to_disk:
  1657                              <1> 	; 11/03/2016
  1658                              <1> 	;xchg	eax, edx ; edx = 0, eax = sector offset
  1659 0000C51B 89D0                <1> 	mov	eax, edx
  1660 0000C51D 034668              <1>         add     eax, [esi+LD_DATABegin]
  1661 0000C520 72D3                <1> 	jc	short loc_add_new_cluster_invalid_format_retn 
  1662                              <1> 		
  1663 0000C522 89D9                <1> 	mov	ecx, ebx ; ECX = sectors per cluster (<256)
  1664 0000C524 BB00000700          <1> 	mov	ebx, Cluster_Buffer
  1665 0000C529 E81F330000          <1> 	call	disk_write
  1666 0000C52E 7307                <1> 	jnc	short loc_add_new_cluster_update_fat_nlc
  1667                              <1> 	
  1668                              <1> 	; 15/10/2016 (1Dh -> 18)
  1669 0000C530 B812000000          <1> 	mov	eax, 18 ; Write Error
  1670 0000C535 EBB4                <1> 	jmp	short loc_add_new_cluster_stc_retn
  1671                              <1> 
  1672                              <1> loc_add_new_cluster_update_fat_nlc:
  1673 0000C537 A1[78640100]        <1> 	mov	eax, [FAT_anc_FFCluster]
  1674 0000C53C 31C9                <1> 	xor	ecx, ecx
  1675 0000C53E 890D[A2600100]      <1> 	mov	[FAT_ClusterCounter], ecx ; 0 ; reset
  1676 0000C544 49                  <1> 	dec	ecx ; 0FFFFFFFFh
  1677 0000C545 E8ACF9FFFF          <1> 	call	update_cluster
  1678 0000C54A 7304                <1> 	jnc	short loc_add_new_cluster_update_fat_plc
  1679 0000C54C 09C0                <1> 	or	eax, eax ;EAX = 0 -> cluster value is 0 or eocc
  1680 0000C54E 759B                <1> 	jnz	short loc_add_new_cluster_stc_retn
  1681                              <1> 
  1682                              <1> loc_add_new_cluster_update_fat_plc:
  1683 0000C550 A1[74640100]        <1> 	mov	eax, [FAT_anc_LCluster]
  1684 0000C555 8B0D[78640100]      <1> 	mov	ecx, [FAT_anc_FFCluster]
  1685 0000C55B E896F9FFFF          <1> 	call	update_cluster
  1686 0000C560 7314                <1> 	jnc	short loc_add_new_cluster_save_fat_buffer
  1687 0000C562 09C0                <1> 	or	eax, eax ; EAX = 0 -> cluster value is 0 or eocc
  1688 0000C564 7410                <1> 	jz	short loc_add_new_cluster_save_fat_buffer
  1689                              <1> 
  1690                              <1> loc_anc_save_fat_buffer_err_retn:
  1691                              <1> 	;cmp	byte [FAT_ClusterCounter], 1
  1692                              <1> 	;jb	short loc_add_new_cluster_retn
  1693                              <1> 
  1694 0000C566 66BB00FF            <1> 	mov	bx, 0FF00h ; recalculate free space (BL = 0)
  1695                              <1> 			   ; (BH = FFh -> Use ESI as Drv Param. Tbl.)
  1696 0000C56A 50                  <1> 	push	eax
  1697 0000C56B E8D8FCFFFF          <1> 	call	calculate_fat_freespace
  1698 0000C570 58                  <1> 	pop	eax
  1699 0000C571 E975FFFFFF          <1>         jmp     loc_add_new_cluster_stc_retn
  1700                              <1> 
  1701                              <1> loc_add_new_cluster_save_fat_buffer:
  1702                              <1> 	;cmp	byte [FAT_BuffValidData], 2
  1703                              <1> 	;jne	short loc_add_new_cluster_calc_FAT_freespace 
  1704                              <1> 	;Byte [FAT_BuffValidData] =  2 
  1705 0000C576 E838FCFFFF          <1> 	call	save_fat_buffer
  1706 0000C57B 72E9                <1> 	jc	short loc_anc_save_fat_buffer_err_retn
  1707                              <1> 
  1708                              <1> loc_add_new_cluster_calc_FAT_freespace:
  1709                              <1> 	;mov	eax, 1 ; Only one Cluster
  1710 0000C57D A1[A2600100]        <1> 	mov	eax, [FAT_ClusterCounter]
  1711 0000C582 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> ESI -> Dos drv desc. table
  1712                              <1> 		; BL = 1 -> add cluster
  1713 0000C586 B301                <1> 	mov	bl, 01h ; BL = 1 -> add clusters
  1714                              <1> 	; NOTE: EAX value will be added to Free Cluster Count
  1715                              <1> 	; (Free Cluster Count is decreased when EAX value is negative)
  1716 0000C588 E8BBFCFFFF          <1>         call    calculate_fat_freespace
  1717                              <1> 	;ECX = 0 -> no error, ECX > 0 -> error or invalid return
  1718 0000C58D 21C9                <1> 	and	ecx, ecx ; ECX = 0 -> valid free sector count
  1719 0000C58F 7409                <1> 	jz	short loc_add_new_cluster_return_cluster_number
  1720                              <1> 
  1721                              <1> loc_add_new_cluster_recalc_FAT_freespace:
  1722 0000C591 66BB00FF            <1> 	mov	bx, 0FF00h  ; recalculate free space
  1723 0000C595 E8AEFCFFFF          <1>         call    calculate_fat_freespace
  1724                              <1> 	; cf = 0
  1725                              <1> loc_add_new_cluster_return_cluster_number:
  1726 0000C59A 89C1                <1> 	mov	ecx, eax ; Free sector count
  1727 0000C59C A1[78640100]        <1> 	mov	eax, [FAT_anc_FFCluster]
  1728 0000C5A1 0FB65E13            <1> 	movzx	ebx, byte [esi+LD_BPB+SecPerClust]
  1729                              <1> 	;mov	edi, Cluster_Buffer
  1730 0000C5A5 31D2                <1> 	xor	edx, edx
  1731 0000C5A7 C3                  <1>         retn
  1732                              <1> 
  1733                              <1> write_cluster:
  1734                              <1> 	; 15/10/2016
  1735                              <1> 	; 21/03/2016 (TRDOS 386 =  TRDOS v2.0)
  1736                              <1> 	;
  1737                              <1> 	; INPUT ->
  1738                              <1> 	;	EAX = Cluster Number (Sector index for SINGLIX FS)
  1739                              <1> 	;	ESI = Logical DOS Drive Description Table address
  1740                              <1> 	;	EBX = Cluster (File R/W) Buffer address (max. 64KB)
  1741                              <1> 	;	Only for SINGLIX FS:
  1742                              <1> 	;	EDX = File Number (The 1st FDT address) 
  1743                              <1> 	; OUTPUT ->
  1744                              <1> 	;	cf = 1 -> Cluster can not be written onto disk
  1745                              <1> 	;	    EAX > 0 -> Error number
  1746                              <1> 	;	cf = 0 -> Cluster has been written successfully
  1747                              <1> 	;
  1748                              <1> 	; (Modified registers: EAX, ECX, EBX, EDX)
  1749                              <1> 	
  1750 0000C5A8 0FB64E13            <1> 	movzx	ecx, byte [esi+LD_BPB+BPB_SecPerClust] 
  1751                              <1> 	; CL = 1 = [esi+LD_FS_Reserved2] ; SectPerClust for Singlix FS
  1752                              <1> 
  1753                              <1> write_file_sectors: ; 16/03/2016
  1754 0000C5AC 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  1755 0000C5B0 761C                <1> 	jna	short write_fs_cluster
  1756                              <1> 
  1757                              <1> write_fat_file_sectors: 
  1758 0000C5B2 83E802              <1> 	sub	eax, 2 ; Beginning cluster number is always 2
  1759 0000C5B5 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+BPB_SecPerClust] ; 18/03/2016 
  1760 0000C5B9 F7E2                <1> 	mul	edx
  1761 0000C5BB 034668              <1> 	add	eax, [esi+LD_DATABegin] ; absolute address of the cluster
  1762                              <1> 
  1763                              <1> 	; EAX = Disk sector address
  1764                              <1> 	; ECX = Sector count
  1765                              <1> 	; EBX = Buffer address
  1766                              <1> 	; (EDX = 0)
  1767                              <1> 	; ESI = Logical DOS drive description table address	
  1768                              <1> 
  1769 0000C5BE E88A320000          <1> 	call	disk_write
  1770 0000C5C3 7306                <1> 	jnc	short wclust_retn
  1771                              <1> 	
  1772                              <1> 	; 15/10/2016 (1Dh -> 18)
  1773 0000C5C5 B812000000          <1> 	mov	eax, 18 ; Drive not ready or write error !
  1774 0000C5CA C3                  <1> 	retn
  1775                              <1> 
  1776                              <1> wclust_retn:
  1777 0000C5CB 29C0                <1> 	sub	eax, eax ; 0
  1778 0000C5CD C3                  <1> 	retn
  1779                              <1> 
  1780                              <1> write_fs_cluster:
  1781                              <1> 	; 21/03/2016 (TRDOS 386 =  TRDOS v2.0)
  1782                              <1> 	; Singlix FS
  1783                              <1> 	
  1784                              <1> 	; EAX = Cluster number is sector index number of the file (eax)
  1785                              <1> 	
  1786                              <1> 	; EDX = File number is the first File Descriptor Table address 
  1787                              <1> 	;	of the file. (Absolute address of the FDT).
  1788                              <1> 	
  1789                              <1> 	; eax = sector index (0 for the first sector)
  1790                              <1> 	; edx = FDT0 address
  1791                              <1> 		; 64 KB buffer = 128 sectors (limit) 
  1792 0000C5CE B980000000          <1> 	mov	ecx, 128 ; maximum count of sectors (before eof) 
  1793 0000C5D3 E801000000          <1> 	call	write_fs_sectors
  1794 0000C5D8 C3                  <1> 	retn
  1795                              <1> 
  1796                              <1> write_fs_sectors:
  1797                              <1> 	; 21/03/2016 (TRDOS 386 =  TRDOS v2.0)
  1798 0000C5D9 F9                  <1> 	stc
  1799 0000C5DA C3                  <1> 	retn
  1800                              <1> 
  1801                              <1> get_cluster_by_index:
  1802                              <1> 	; 29/04/2016 (TRDOS 386 =  TRDOS v2.0)
  1803                              <1> 	; INPUT ->
  1804                              <1> 	; 	EAX = Beginning cluster
  1805                              <1> 	; 	EDX = Sector index in disk/file section
  1806                              <1> 	;	      (Only for SINGLIX file system!)
  1807                              <1> 	; 	ECX = Cluster sequence number after the beginning cluster
  1808                              <1> 	; 	ESI = Logical DOS Drive Description Table address
  1809                              <1> 	; OUTPUT ->
  1810                              <1> 	;	EAX = Cluster number 
  1811                              <1> 	;	cf = 1 -> Error code in AL (EAX)
  1812                              <1> 	;
  1813                              <1> 	;(Modified registers: EAX, ECX, EBX, EDX)
  1814                              <1> 	;	
  1815 0000C5DB 807E0301            <1> 	cmp	byte [esi+LD_FATType], 1
  1816 0000C5DF 721E                <1>         jb      short get_fs_section_by_index 
  1817                              <1> 
  1818 0000C5E1 3B4E78              <1> 	cmp	ecx, [esi+LD_Clusters]
  1819 0000C5E4 7207                <1> 	jb	short gcbi_1
  1820                              <1> gcbi_0:
  1821 0000C5E6 F9                  <1> 	stc
  1822 0000C5E7 B823000000          <1> 	mov	eax, 23h ; Cluster not available ! 
  1823                              <1> 			 ; MSDOS error code: FCB unavailable
  1824 0000C5EC C3                  <1> 	retn
  1825                              <1> gcbi_1:
  1826 0000C5ED 51                  <1> 	push	ecx
  1827 0000C5EE E8D9F5FFFF          <1> 	call	get_next_cluster
  1828 0000C5F3 59                  <1> 	pop	ecx
  1829 0000C5F4 7203                <1> 	jc	short gcbi_3
  1830 0000C5F6 E2F5                <1> 	loop	gcbi_1
  1831                              <1> gcbi_2:
  1832 0000C5F8 C3                  <1> 	retn
  1833                              <1> gcbi_3:
  1834 0000C5F9 09C0                <1> 	or	eax, eax
  1835 0000C5FB 74E9                <1> 	jz	short gcbi_0
  1836 0000C5FD F5                  <1> 	cmc 	; stc
  1837 0000C5FE C3                  <1> 	retn
  1838                              <1> 
  1839                              <1> get_fs_section_by_index:
  1840                              <1> 	; 29/04/2016 (TRDOS 386 =  TRDOS v2.0)
  1841                              <1> 	; INPUT ->
  1842                              <1> 	; 	EAX = Beginning FDT number/address
  1843                              <1> 	; 	EDX = Sector index in disk/file section
  1844                              <1> 	; 	ECX = Sector sequence number after the beginning FDT
  1845                              <1> 	; 	ESI = Logical DOS Drive Description Table address
  1846                              <1> 	; OUTPUT ->
  1847                              <1> 	; 	EAX = FDT number/address
  1848                              <1> 	; 	EDX = Sector index of the section (0,1,2,3,4...)
  1849                              <1> 	;	cf = 1 -> Error code in AL (EAX)
  1850                              <1> 	;
  1851                              <1> 	;(Modified registers: EAX, ECX, EBX, EDX)
  1852                              <1> 	;
  1853 0000C5FF B8FFFFFFFF          <1> 	mov	eax, 0FFFFFFFFh
  1854 0000C604 C3                  <1> 	retn
  1855                              <1> 
  1856                              <1> get_last_section:
  1857                              <1> 	; 22/10/2016 (TRDOS 386 =  TRDOS v2.0)	
  1858                              <1> 	; INPUT ->
  1859                              <1> 	; 	EAX = (The 1st) FDT number/address
  1860                              <1> 	; 	ESI = Logical DOS Drive Description Table address
  1861                              <1> 	; OUTPUT ->
  1862                              <1> 	; 	EAX = FDT number/address of the last section
  1863                              <1> 	; 	EDX = Last sector of the section (0,1,2,3,4...)
  1864                              <1> 	;	[glc_index] = sector index number of the last sector
  1865                              <1> 	;		      (for file, not for the last section)  	
  1866                              <1> 	;		   	
  1867                              <1> 	;	cf = 1 -> Error code in AL (EAX)
  1868                              <1> 	;
  1869                              <1> 	;(Modified registers: EAX, ECX, EBX, EDX)
  1870                              <1> 	;
  1871 0000C605 B800000000          <1> 	mov	eax, 0
  1872 0000C60A BA00000000          <1> 	mov	edx, 0
  1873 0000C60F C3                  <1> 	retn
  2310                                  %include 'trdosk6.s' ; 24/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.2) - MAIN PROGRAM : trdosk6.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 03/08/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    11                              <1> ; u1.s (27/17/2015), u2.s (03/01/2016)
    12                              <1> ; ****************************************************************************
    13                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    14                              <1> ; TRDOS2.ASM (09/11/2011)
    15                              <1> ; ----------------------------------------------------------------------------
    16                              <1> ; INT_21H.ASM (c) 2009-2011 Erdogan TAN  [14/11/2009] Last Update: 08/11/2011
    17                              <1> 
    18                              <1> sysent: ; < enter to system call >
    19                              <1> 	; 17/03/2017
    20                              <1> 	; 03/03/2017
    21                              <1> 	; 19/02/2017
    22                              <1> 	; 13/01/2017
    23                              <1> 	; 06/06/2016
    24                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
    25                              <1> 	; 16/04/2015 - 19/10/2015 (Retro UNIX 386 v1)
    26                              <1> 	; 10/04/2013 - 18/01/2014 (Retro UNIX 8086 v1)
    27                              <1> 	;
    28                              <1> 	; 'unkni' or 'sysent' is sytem entry from various traps. 
    29                              <1> 	; The trap type is determined and an indirect jump is made to 
    30                              <1> 	; the appropriate system call handler. If there is a trap inside
    31                              <1> 	; the system a jump to panic is made. All user registers are saved 
    32                              <1> 	; and u.sp points to the end of the users stack. The sys (trap)
    33                              <1> 	; instructor is decoded to get the the system code part (see
    34                              <1> 	; trap instruction in the PDP-11 handbook) and from this 
    35                              <1> 	; the indirect jump address is calculated. If a bad system call is
    36                              <1> 	; made, i.e., the limits of the jump table are exceeded, 'badsys'
    37                              <1> 	; is called. If the call is legitimate control passes to the
    38                              <1> 	; appropriate system routine.
    39                              <1> 	;
    40                              <1> 	; Calling sequence:
    41                              <1> 	;	Through a trap caused by any sys call outside the system.
    42                              <1> 	; Arguments:
    43                              <1> 	;	Arguments of particular system call.	
    44                              <1> 	; ...............................................................
    45                              <1> 	;	
    46                              <1> 	; Retro UNIX 8086 v1 modification: 
    47                              <1> 	;       System call number is in EAX register.
    48                              <1> 	;
    49                              <1> 	;       Other parameters are in EDX, EBX, ECX, ESI, EDI, EBP
    50                              <1> 	;	registers depending of function details.
    51                              <1>   	;
    52                              <1> 	; 16/04/2015
    53 0000C610 368925[5C030300]    <1>         mov     [ss:u.sp], esp ; Kernel stack points to return address
    54                              <1> 
    55                              <1> 	; save user registers
    56 0000C617 1E                  <1> 	push	ds
    57 0000C618 06                  <1> 	push	es
    58 0000C619 0FA0                <1> 	push	fs
    59 0000C61B 0FA8                <1> 	push	gs
    60 0000C61D 60                  <1> 	pushad  ; eax, ecx, edx, ebx, esp -before pushad-, ebp, esi, edi
    61                              <1> 	;
    62                              <1> 	; ESPACE = [ss:u.sp] - esp ; 4*12 = 48 ; 17/09/2015 ; 06/06/2016
    63                              <1> 	; 	(ESPACE is size of space in kernel stack 
    64                              <1> 	;	for saving/restoring user registers.)
    65                              <1> 	;
    66 0000C61E 50                  <1> 	push	eax ; 01/07/2015
    67 0000C61F 66B81000            <1> 	mov     ax, KDATA
    68 0000C623 8ED8                <1>         mov     ds, ax
    69 0000C625 8EC0                <1>         mov     es, ax
    70 0000C627 8EE0                <1>         mov     fs, ax
    71 0000C629 8EE8                <1>         mov     gs, ax
    72 0000C62B A1[C0580100]        <1> 	mov	eax, [k_page_dir]
    73 0000C630 0F22D8              <1> 	mov	cr3, eax
    74 0000C633 58                  <1> 	pop	eax ; 01/07/2015
    75                              <1> 	; 19/10/2015
    76 0000C634 FC                  <1> 	cld
    77                              <1> 	;
    78 0000C635 FE05[5B030300]      <1> 	inc	byte [sysflg]
    79                              <1> 		; incb sysflg / indicate a system routine is in progress
    80 0000C63B FB                  <1>         sti 	; 18/01/2014
    81 0000C63C 0F85DF9DFFFF        <1> 	jnz     panic ; 24/05/2013
    82                              <1> 		; beq 1f
    83                              <1> 		; jmp panic ; / called if trap inside system
    84                              <1> ;1:
    85                              <1> 	; 17/03/2017
    86 0000C642 80642438FE          <1> 	and	byte [esp+ESPACE+8], ~1 ; clear carry flag
    87                              <1> 
    88                              <1> 	; 16/04/2015
    89 0000C647 A3[64030300]        <1> 	mov	[u.r0], eax
    90 0000C64C 8925[60030300]      <1> 	mov	[u.usp], esp ; kernel stack points to user's registers
    91                              <1> 
    92                              <1> 	; 13/01/2017 (TRDOS 386 Feaure only !)
    93 0000C652 803D[D4030300]00    <1> 	cmp	byte [u.t_lock], 0 ; timer interrupt lock ?
    94 0000C659 0F879D010000        <1> 	ja	sysrele		   ; yes, sys release only !!!
    95                              <1> 
    96                              <1> 		; mov $s.syst+2,clockp
    97                              <1> 		; mov r0,-(sp) / save user registers 
    98                              <1> 		; mov sp,u.r0 / pointer to bottom of users stack 
    99                              <1> 			   ; / in u.r0
   100                              <1> 		; mov r1,-(sp)
   101                              <1> 		; mov r2,-(sp)
   102                              <1> 		; mov r3,-(sp)
   103                              <1> 		; mov r4,-(sp)
   104                              <1> 		; mov r5,-(sp)
   105                              <1> 		; mov ac,-(sp) / "accumulator" register for extended
   106                              <1> 		             ; / arithmetic unit
   107                              <1> 		; mov mq,-(sp) / "multiplier quotient" register for the
   108                              <1> 		             ; / extended arithmetic unit
   109                              <1> 		; mov sc,-(sp) / "step count" register for the extended
   110                              <1> 		             ; / arithmetic unit
   111                              <1> 		; mov sp,u.sp / u.sp points to top of users stack
   112                              <1> 		; mov 18.(sp),r0 / store pc in r0
   113                              <1> 		; mov -(r0),r0 / sys inst in r0      10400xxx
   114                              <1> 		; sub $sys,r0 / get xxx code
   115 0000C65F C1E002              <1> 	shl	eax, 2
   116                              <1> 		; asl r0 / multiply by 2 to jump indirect in bytes
   117 0000C662 3DB8000000          <1> 	cmp	eax, end_of_syscalls - syscalls
   118                              <1> 		; cmp r0,$2f-1f / limit of table (35) exceeded
   119                              <1> 	;jnb	short badsys
   120                              <1> 		; bhis badsys / yes, bad system call
   121 0000C667 F5                  <1> 	cmc
   122 0000C668 9C                  <1> 	pushf	
   123 0000C669 50                  <1> 	push	eax
   124 0000C66A 8B2D[5C030300]      <1>  	mov 	ebp, [u.sp] ; Kernel stack at the beginning of sys call
   125 0000C670 B0FE                <1> 	mov	al, 0FEh ; 11111110b
   126 0000C672 1400                <1> 	adc	al, 0 ; al = al + cf
   127 0000C674 204508              <1> 	and	[ebp+8], al ; flags (reset carry flag)
   128                              <1> 		; bic $341,20.(sp) / set users processor priority to 0 
   129                              <1> 				 ; / and clear carry bit
   130 0000C677 5D                  <1> 	pop	ebp ; eax
   131 0000C678 9D                  <1> 	popf
   132 0000C679 0F8208020000        <1>         jc      badsys
   133 0000C67F A1[64030300]        <1> 	mov	eax, [u.r0]
   134                              <1> 	; system call registers: EAX, EDX, ECX, EBX, ESI, EDI
   135 0000C684 FFA5[8AC60000]      <1> 	jmp	dword [ebp+syscalls]
   136                              <1> 		; jmp *1f(r0) / jump indirect thru table of addresses
   137                              <1> 		            ; / to proper system routine.
   138                              <1> syscalls: ; 1:
   139                              <1> 	; 31/12/2017
   140                              <1> 	; 28/02/2017
   141                              <1> 	; 20/02/2017
   142                              <1> 	; 19/02/2017
   143                              <1> 	; 15/10/2016
   144                              <1> 	; 20/05/2016
   145                              <1> 	; 19/05/2016
   146                              <1> 	; 16/05/2016
   147                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   148                              <1> 	; 21/09/2015
   149                              <1> 	; 01/07/2015
   150                              <1> 	; 16/04/2015 (32 bit address modification) 
   151 0000C68A [41E70000]          <1> 	dd sysver	; 0 ; Get TRDOS 386 version number (v2.0)	
   152 0000C68E [E9C80000]          <1> 	dd sysexit 	; 1
   153 0000C692 [BECA0000]          <1> 	dd sysfork 	; 2
   154 0000C696 [F1CE0000]          <1> 	dd sysread 	; 3
   155 0000C69A [10CF0000]          <1> 	dd syswrite 	; 4
   156 0000C69E [A7CC0000]          <1> 	dd sysopen 	; 5
   157 0000C6A2 [C8CE0000]          <1> 	dd sysclose 	; 6
   158 0000C6A6 [40CA0000]          <1> 	dd syswait 	; 7
   159 0000C6AA [D6CB0000]          <1> 	dd syscreat 	; 8
   160 0000C6AE [95F50000]          <1> 	dd sysrename	; 9  ; TRDOS 386, Rename File (31/12/2017)
   161 0000C6B2 [10F10000]          <1> 	dd sysdelete	; 10 ; TRDOS 386, Delete File (29/12/2017)
   162 0000C6B6 [24DB0000]          <1> 	dd sysexec 	; 11
   163 0000C6BA [3AF20000]          <1> 	dd syschdir 	; 12
   164 0000C6BE [FFF30000]          <1> 	dd systime 	; 13 ; TRDOS 386, Get Sys Date&Time (30/12/2017)
   165 0000C6C2 [8ACE0000]          <1> 	dd sysmkdir 	; 14
   166 0000C6C6 [6EF20000]          <1> 	dd syschmod 	; 15 ; TRDOS 386, Change Attributes (30/12/2017) 
   167 0000C6CA [77F10000]          <1> 	dd sysrmdir 	; 16 ; TRDOS 386, Remove Directory (29/12/2017)
   168 0000C6CE [FFDD0000]          <1> 	dd sysbreak 	; 17
   169 0000C6D2 [54F30000]          <1> 	dd sysdrive 	; 18 ; TRDOS 386, Get/Set Current Drv (30/12/2017) 
   170 0000C6D6 [40DE0000]          <1> 	dd sysseek 	; 19
   171 0000C6DA [52DE0000]          <1> 	dd systell 	; 20
   172 0000C6DE [B6F60000]          <1> 	dd sysmem 	; 21 ; TRDOS 386, Get Total&Free Mem (31/12/2017)
   173 0000C6E2 [ECF60000]          <1> 	dd sysprompt 	; 22 ; TRDOS 386, Change Cmd Prompt (31/12/2017)
   174 0000C6E6 [2EF70000]          <1> 	dd syspath 	; 23 ; TRDOS 386, Get/Set Run Path (31/12/2017)
   175 0000C6EA [9BF70000]          <1> 	dd sysenv 	; 24 ; TRDOS 386, Get/Set Env Vars (31/12/2017)
   176 0000C6EE [80F40000]          <1> 	dd sysstime 	; 25 ; TRDOS 386, Set Sys Date&Time (30/12/2017)
   177 0000C6F2 [B8DE0000]          <1> 	dd sysquit 	; 26
   178 0000C6F6 [ACDE0000]          <1> 	dd sysintr 	; 27
   179 0000C6FA [A3F30000]          <1> 	dd sysdir 	; 28 ; TRDOS 386, Get Curr Drive&Dir (30/12/2017) 
   180 0000C6FE [A7CF0000]          <1> 	dd sysemt 	; 29
   181 0000C702 [DEF30000]          <1> 	dd sysldrvt	; 30 ; TRDOS 386, Get Logical DOS DDT (30/12/2017)
   182 0000C706 [58D10000]          <1> 	dd sysvideo 	; 31 ; TRDOS 386 Video Functions (16/05/2016)
   183 0000C70A [6B010100]          <1> 	dd sysaudio 	; 32 ; TRDOS 386 Audio Functions (16/05/2016)
   184 0000C70E [C0CF0000]          <1> 	dd systimer 	; 33 ; TRDOS 386 Timer Functions (18/05/2016)
   185 0000C712 [F9DE0000]          <1> 	dd syssleep 	; 34 ; Retro UNIX 8086 v1 feature only !
   186                              <1> 			     ; 11/06/2014
   187 0000C716 [28DF0000]          <1> 	dd sysmsg	; 35 ; Retro UNIX 386 v1 feature only !
   188                              <1> 			     ; 01/07/2015
   189 0000C71A [FFDF0000]          <1> 	dd sysgeterr	; 36 ; Retro UNIX 386 v1 feature only !
   190                              <1> 			     ; 21/09/2015 - get last error number
   191 0000C71E [E7F00000]          <1> 	dd sysfpstat	; 37 ; TRDOS 386 FPU state option (28/02/2017)
   192 0000C722 [50E70000]          <1> 	dd syspri 	; 38 ; change priority - TRDOS 386 (20/05/2016)
   193 0000C726 [FCC70000]          <1> 	dd sysrele	; 39 ; TRDOS 386 (19/05/2016) (0 -> 39)
   194 0000C72A [83E80000]          <1> 	dd sysfff	; 40 ; Find First File - TRDOS 386 (15/10/2016)
   195 0000C72E [62E90000]          <1> 	dd sysfnf	; 41 ; Find Next File - TRDOS 386 (15/10/2016)
   196 0000C732 [D2EF0000]          <1> 	dd sysalloc	; 42 ; Allocate contiguous memory block/pages
   197                              <1> 			     ; TRDOS 386 (19/02/2017) DMA buff fuctions		
   198 0000C736 [90F00000]          <1> 	dd sysdalloc	; 43 ; Deallocate contiguous memory block/pages
   199                              <1> 			     ; TRDOS 386 (19/02/2017) DMA buff fuctions
   200 0000C73A [CBF00000]          <1> 	dd syscalbac	; 44 ; IRQ Callback and Signal Response Byte
   201                              <1> 			     ; service setup - TRDOS 386 (20/02/2017)
   202                              <1> 			     ; 28/08/2017 (20/08/2017)	
   203 0000C73E [FC090100]          <1> 	dd sysdma	; 45 ; TRDOS 386 - (ISA) DMA service
   204                              <1> 	
   205                              <1> end_of_syscalls:
   206                              <1> 
   207                              <1> error:
   208                              <1> 	; 18/05/2016
   209                              <1> 	; 13/05/2016
   210                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   211                              <1> 	; 16/04/2015 - 17/09/2015 (Retro UNIX 386 v1)
   212                              <1> 	; 10/04/2013 - 07/08/2013 (Retro UNIX 8086 v1)
   213                              <1> 	;
   214                              <1> 	; 'error' merely sets the error bit off the processor status (c-bit)
   215                              <1> 	; then falls right into the 'sysret', 'sysrele' return sequence.
   216                              <1> 	;
   217                              <1> 	; INPUTS -> none
   218                              <1> 	; OUTPUTS ->
   219                              <1> 	;	processor status - carry (c) bit is set (means error)
   220                              <1> 	;
   221                              <1> 	; 26/05/2013 (Stack pointer must be reset here! 
   222                              <1> 	; 	      Because, jumps to error procedure
   223                              <1> 	;	      disrupts push-pop nesting balance)
   224                              <1> 	;
   225 0000C742 8B2D[5C030300]      <1> 	mov	ebp, [u.sp] ; interrupt (system call) return (iretd) address
   226 0000C748 804D0801            <1> 	or	byte [ebp+8], 1  ; set carry bit of flags register
   227                              <1> 				 ; (system call will return with cf = 1)
   228                              <1> 		; bis $1,20.(r1) / set c bit in processor status word below
   229                              <1> 		               ; / users stack
   230                              <1> 	; 17/09/2015
   231 0000C74C 83ED30              <1> 	sub	ebp, ESPACE ; 48 ; total size of stack frame ('sysdefs.inc')
   232                              <1> 				 ; for saving/restoring user registers	
   233                              <1> 	;cmp	ebp, [u.usp]
   234                              <1> 	;je	short err0	
   235 0000C74F 892D[60030300]      <1> 	mov	[u.usp], ebp
   236                              <1> ;err0:
   237                              <1> 	; 01/09/2015
   238 0000C755 8B25[60030300]      <1> 	mov	esp, [u.usp] 	    ; Retro Unix 8086 v1 modification!
   239                              <1> 				    ; 10/04/2013
   240                              <1> 				    ; (If an I/O error occurs during disk I/O,
   241                              <1> 				    ; related procedures will jump to 'error'
   242                              <1> 				    ; procedure directly without returning to 
   243                              <1> 				    ; the caller procedure. So, stack pointer
   244                              <1>                                     ; must be restored here.)
   245                              <1> 	; 13/05/2016
   246                              <1> 	; NOTE: (The last) error code is in 'u.error', it can be retrieved by
   247                              <1> 	;	'get last error' system call later. 	
   248                              <1> 
   249                              <1> 	; 03/09/2015 - 09/06/2015 - 07/08/2013
   250 0000C75B C605[C6030300]00    <1> 	mov 	byte [u.kcall], 0 ; namei_r, mkdir_w reset
   251                              <1> 
   252                              <1> sysret: ; < return from system call>
   253                              <1> 	; 01/03/2017
   254                              <1> 	; 28/02/2017
   255                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   256                              <1> 	; 16/04/2015 - 10/09/2015 (Retro UNIX 386 v1)
   257                              <1> 	; 10/04/2013 - 23/02/2014 (Retro UNIX 8086 v1)
   258                              <1> 	;
   259                              <1> 	; 'sysret' first checks to see if process is about to be 
   260                              <1> 	; terminated (u.bsys). If it is, 'sysexit' is called.
   261                              <1> 	; If not, following happens:	 
   262                              <1> 	; 	1) The user's stack pointer is restored.
   263                              <1> 	;	2) r1=0 and 'iget' is called to see if last mentioned
   264                              <1> 	;	   i-node has been modified. If it has, it is written out
   265                              <1> 	;	   via 'ppoke'.
   266                              <1> 	;	3) If the super block has been modified, it is written out
   267                              <1> 	;	   via 'ppoke'.				
   268                              <1> 	;	4) If the dismountable file system's super block has been
   269                              <1> 	;	   modified, it is written out to the specified device
   270                              <1> 	;	   via 'ppoke'.
   271                              <1> 	;	5) A check is made if user's time quantum (uquant) ran out
   272                              <1> 	;	   during his execution. If so, 'tswap' is called to give
   273                              <1> 	;	   another user a chance to run.
   274                              <1> 	;	6) 'sysret' now goes into 'sysrele'. 
   275                              <1> 	;	    (See 'sysrele' for conclusion.)		
   276                              <1> 	;
   277                              <1> 	; Calling sequence:
   278                              <1> 	;	jump table or 'br sysret'
   279                              <1> 	; Arguments: 
   280                              <1> 	;	-	
   281                              <1> 	; ...............................................................
   282                              <1> 	;	
   283                              <1> 	; ((AX=r1 for 'iget' input))
   284                              <1> 	;	
   285 0000C762 31C0                <1> 	xor	eax, eax ; 28/02/2017
   286                              <1> sysret0: ; 29/07/2015 (eax = 0, jump from sysexec)
   287 0000C764 FEC0                <1> 	inc	al ; 04/05/2013
   288 0000C766 3805[B2030300]      <1> 	cmp	[u.bsys], al ; 1
   289                              <1> 		; tstb u.bsys / is a process about to be terminated because
   290 0000C76C 0F8377010000        <1>         jnb     sysexit ; 04/05/2013
   291                              <1> 		; bne sysexit / of an error? yes, go to sysexit
   292                              <1> 	;mov	esp, [u.usp] ; 24/05/2013 (that is not needed here)
   293                              <1> 		; mov u.sp,sp / no point stack to users stack
   294 0000C772 FEC8                <1> 	dec 	al ; mov ax, 0
   295                              <1> 		; clr r1 / zero r1 to check last mentioned i-node
   296 0000C774 E8CD300000          <1> 	call	iget
   297                              <1> 		; jsr r0,iget / if last mentioned i-node has been modified
   298                              <1> 		            ; / it is written out
   299                              <1> 	; 10/01/2017
   300                              <1> 	; 09/01/2017
   301                              <1> ;sysrele: ; < release >
   302                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   303                              <1> 	; 16/04/2015 - 14/10/2015 (Retro UNIX 386 v1)
   304                              <1> 	; 10/04/2013 - 07/03/2014 (Retro UNIX 8086 v1)
   305                              <1> 	;
   306                              <1> 	; 'sysrele' first calls 'tswap' if the time quantum for a user is
   307                              <1> 	;  zero (see 'sysret'). It then restores the user's registers and
   308                              <1> 	; turns off the system flag. It then checked to see if there is
   309                              <1> 	; an interrupt from the user by calling 'isintr'. If there is, 
   310                              <1> 	; the output gets flashed (see isintr) and interrupt action is
   311                              <1> 	; taken by a branch to 'intract'. If there is no interrupt from
   312                              <1> 	; the user, a rti is made.
   313                              <1> 	;
   314                              <1> 	; Calling sequence:
   315                              <1> 	;	Fall through a 'bne' in 'sysret' & ?
   316                              <1> 	; Arguments:
   317                              <1> 	;	-	
   318                              <1> 	; ...............................................................
   319                              <1> 	;	
   320                              <1> 	; 23/02/2014 (swapret)
   321                              <1> 	; 22/09/2013
   322                              <1> sysrel0: ;1:
   323 0000C779 803D[A8030300]00    <1> 	cmp	byte [u.quant], 0 ; 16/05/2013
   324                              <1> 		; tstb uquant / is the time quantum 0?
   325 0000C780 7705                <1>         ja      short swapret
   326                              <1> 		; bne 1f / no, don't swap it out
   327                              <1> sysrelease: ; 07/12/2013 (jump from 'clock')
   328 0000C782 E8821E0000          <1> 	call	tswap
   329                              <1> 		; jsr r0,tswap / yes, swap it out
   330                              <1> 	
   331                              <1> ; Retro Unix 8086 v1 feature: return from 'swap' to 'swapret' address.
   332                              <1> swapret: ;1:
   333                              <1> 	; 10/09/2015
   334                              <1> 	; 01/09/2015
   335                              <1> 	; 14/05/2015
   336                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - 32 bit, pm modifications)
   337                              <1> 	; 26/05/2013 (Retro UNIX 8086 v1)
   338                              <1> 	; cli
   339                              <1> 	; 24/07/2015
   340                              <1> 	;
   341                              <1> 	;; 'esp' must be already equal to '[u.usp]' here ! 
   342                              <1> 	;; mov	esp, [u.usp]
   343                              <1> 
   344                              <1> 	; 22/09/2013
   345 0000C787 E8BB300000          <1> 	call	isintr
   346                              <1> 	; 20/10/2013
   347 0000C78C 7405                <1> 	jz	short sysrel1
   348 0000C78E E83F010000          <1> 	call	intract
   349                              <1> 		; jsr r0,isintr / is there an interrupt from the user
   350                              <1> 		;     br intract / yes, output gets flushed, take interrupt
   351                              <1> 		               ; / action
   352                              <1> sysrel1:
   353 0000C793 FA                  <1> 	cli	; 14/10/2015
   354                              <1> sysrel2:
   355                              <1> 	; 28/02/2017
   356                              <1> 	; Check if there is a (delayed) callback for current user/process
   357 0000C794 A0[D7030300]        <1> 	mov	al, [u.irqwait]
   358 0000C799 240F                <1> 	and	al, 0Fh ; is there a waiting IRQ callback service ?
   359 0000C79B 7444                <1> 	jz	short sysrel8 ; no
   360                              <1> 
   361                              <1> 	; Set return to IRQ callback service and return from the service
   362 0000C79D 0FB6D8              <1> 	movzx	ebx, al
   363 0000C7A0 883D[D7030300]      <1> 	mov 	[u.irqwait], bh ; 0 ; reset
   364 0000C7A6 8A9B[96160100]      <1> 	mov	bl, [ebx+IRQenum] ; (available) IRQ index +1 (1 to 9)
   365                              <1> 	; 01/03/2017
   366 0000C7AC FECB                <1> 	dec	bl ; IRQ index number, 0 to 8
   367 0000C7AE 7831                <1> 	js	short sysrel8 ; 0 -> FFh (not in use!?) 
   368                              <1> 	;
   369 0000C7B0 A0[B3030300]        <1> 	mov 	al, [u.uno] ; current process (user) number 
   370 0000C7B5 3883[F26A0100]      <1> 	cmp	[ebx+IRQ.owner], al
   371 0000C7BB 7524                <1> 	jne	short sysrel8 ; it is not the current user/process !?
   372 0000C7BD F683[046B0100]01    <1> 	test	byte [ebx+IRQ.method], 1 ; callback ?
   373 0000C7C4 741B                <1> 	jz	short sysrel8 ; not a callback method !?
   374                              <1> 
   375 0000C7C6 8B93[166B0100]      <1> 	mov	edx, [ebx+IRQ.addr] ; IRQ callback service address (virtual)
   376 0000C7CC C605[D8030300]01    <1> 	mov	byte [u.r_lock], 1 ; IRQ callback service in progress flag
   377                              <1> 
   378 0000C7D3 E8D91E0000          <1> 	call	wswap ; save user's registers & status 
   379                              <1> 		      ;	(for return from IRQ callback service)
   380                              <1> 
   381 0000C7D8 8B2D[5C030300]      <1> 	mov	ebp, [u.sp]; kernel's stack, points to EIP (user)
   382 0000C7DE 895500              <1> 	mov	[ebp], edx ; IRQ call back service address
   383                              <1> sysrel8:
   384 0000C7E1 FE0D[5B030300]      <1> 	dec	byte [sysflg]
   385                              <1> 		; decb sysflg / turn system flag off
   386                              <1> 	
   387 0000C7E7 A1[B8030300]        <1> 	mov	eax, [u.pgdir]	
   388 0000C7EC 0F22D8              <1> 	mov	cr3, eax  ; 1st PDE points to Kernel Page Table 0 (1st 4 MB)
   389                              <1> 			  ; (others are different than kernel page tables) 
   390                              <1> 	; 10/09/2015
   391 0000C7EF 61                  <1> 	popad ; edi, esi, ebp, temp (icrement esp by 4), ebx, edx, ecx, eax
   392                              <1> 		; mov (sp)+,sc / restore user registers
   393                              <1> 		; mov (sp)+,mq
   394                              <1> 		; mov (sp)+,ac
   395                              <1> 		; mov (sp)+,r5
   396                              <1> 		; mov (sp)+,r4
   397                              <1> 		; mov (sp)+,r3
   398                              <1> 		; mov (sp)+,r2
   399                              <1> 	;
   400 0000C7F0 A1[64030300]        <1> 	mov	eax, [u.r0]  ; ((return value in EAX))
   401 0000C7F5 0FA9                <1> 	pop	gs
   402 0000C7F7 0FA1                <1> 	pop	fs
   403 0000C7F9 07                  <1> 	pop	es
   404 0000C7FA 1F                  <1> 	pop	ds
   405                              <1> 	;or	word [esp+8], 200h ; 22/01/2017 ; force enabling interrupts
   406 0000C7FB CF                  <1> 	iretd	
   407                              <1> 		; rti / no, return from interrupt
   408                              <1> 
   409                              <1> sysrele:
   410                              <1> 	; 24/03/2017
   411                              <1> 	; 28/02/2017
   412                              <1> 	; 27/02/2017
   413                              <1> 	; 29/01/2017
   414                              <1> 	; 14/01/2017
   415                              <1> 	; 13/01/2017
   416                              <1> 	; 09/01/2017, 10/01/2017, 12/01/2017
   417                              <1> 	; Major modification for TRDOS 386 (CallBack return)
   418                              <1> 	;
   419                              <1> 	; 'sysrele' system call restores previously saved
   420                              <1> 	; registers and addresses of the process
   421                              <1> 	; (Main purpose -in TRDOS 386- is to return from
   422                              <1> 	; timer callback service routine in ring 3 -user mode-.)
   423                              <1> 	;
   424                              <1> 	; check if the process is in timer callback phase
   425 0000C7FC 803D[D4030300]00    <1> 	cmp	byte [u.t_lock], 0 ; TIMER INT LOCK
   426                              <1> 	;je	short sysrel0 ; classic (Retro UNIX 386 type) sysrele
   427 0000C803 7734                <1> 	ja	short sysrel3
   428                              <1> 	; 27/02/2017
   429 0000C805 803D[D8030300]00    <1> 	cmp	byte [u.r_lock], 0 ; IRQ callback lock	
   430 0000C80C 0F8667FFFFFF        <1> 	jna	sysrel0 ; classic sysrele ; 24/03/2017
   431 0000C812 E859000000          <1> 	call	sysrel7
   432 0000C817 803D[D8030300]00    <1> 	cmp	byte [u.r_lock], 0 ; IRQ callback service lock
   433 0000C81E 7628                <1> 	jna	short sysrel4
   434 0000C820 C605[D8030300]00    <1> 	mov	byte [u.r_lock], 0 ; reset
   435                              <1> 	;mov	byte [u.irqwait], 0 ; reset ; 28/02/2017
   436 0000C827 A0[D9030300]        <1> 	mov	al, [u.r_mode]
   437 0000C82C 08C0                <1> 	or	al, al
   438 0000C82E 7518                <1> 	jnz	short sysrel4
   439 0000C830 FEC8                <1> 	dec	al
   440 0000C832 A2[D9030300]        <1> 	mov	[u.r_mode], al ; 0FFh ; not necessary !?
   441 0000C837 EB32                <1> 	jmp	short sysrel6		
   442                              <1> sysrel3:
   443                              <1> 	; 27/02/2017
   444 0000C839 E832000000          <1> 	call	sysrel7
   445                              <1> 	; 14/01/2017
   446 0000C83E 28C0                <1> 	sub	al, al
   447 0000C840 3805[D4030300]      <1> 	cmp	[u.t_lock], al ; 0 ; TIMER INT LOCK
   448 0000C846 770E                <1> 	ja	short sysrel5 ; yes
   449                              <1> sysrel4:
   450                              <1> 	; 29/01/2017
   451 0000C848 8B44241C            <1> 	mov	eax, [esp+28] ; eax
   452 0000C84C A3[64030300]        <1> 	mov	[u.r0], eax
   453 0000C851 E93EFFFFFF          <1> 	jmp	sysrel2
   454                              <1> sysrel5:
   455 0000C856 A2[D4030300]        <1> 	mov	[u.t_lock], al ; 0 ; reset
   456 0000C85B A0[D5030300]        <1> 	mov	al, [u.t_mode]
   457 0000C860 20C0                <1> 	and	al, al
   458                              <1> 	;jnz	short sysrel2 ; 0FFh ; user mode
   459 0000C862 75E4                <1> 	jnz	short sysrel4 ; 29/01/2017
   460 0000C864 FEC8                <1> 	dec	al
   461 0000C866 A2[D5030300]        <1> 	mov	[u.t_mode], al ; 0FFh ; not necessary !?
   462                              <1> sysrel6:
   463                              <1> 	; cpu will continue from the interrupted sytem call addr
   464 0000C86B 61                  <1> 	popad		; edi, esi, ebp, esp, ebx, edx, ecx, eax
   465 0000C86C 83C410              <1> 	add	esp, 16	; pass segment segisters: ds, es, fs, gs		
   466 0000C86F CF                  <1> 	iretd		; eip, cs, eflags
   467                              <1> 
   468                              <1> sysrel7:
   469 0000C870 0FB61D[B3030300]    <1> 	movzx	ebx, byte [u.uno] ; current process number
   470 0000C877 66C1E302            <1> 	shl	bx, 2
   471                              <1> 	;cmp	[ebx+p.tcb-4], eax ; 0 ; is there callback address ?
   472                              <1> 	;jna	short sysrel0 
   473                              <1> 	; yes, reset callback address then restore process registers 
   474                              <1> 	;mov	[ebx+p.tcb-4], eax ; 0 ; reset
   475 0000C87B 8B83[BC000300]      <1> 	mov     eax, [ebx+p.upage-4] ; UPAGE address
   476 0000C881 FA                  <1> 	cli	; disable interrupts till 'iretd'
   477 0000C882 E9621E0000          <1> 	jmp	rswap ; restore process 'u' structure
   478                              <1>  
   479                              <1> badsys:
   480                              <1> 	; 25/12/2016
   481                              <1> 	; 18/04/2016 (TRDOS 386 = TRDOS v2.0)
   482                              <1> 	; 17/04/2011 (TRDOS v1.0, 'IFC.ASM')
   483                              <1> 	; 03/02/2011 ('trdos_ifc_routine')
   484                              <1> 	;
   485                              <1> 	; 16/04/2015 (Retro UNIX 386 v1, 'badsys')
   486                              <1> 	; (EIP, EAX values will be shown on screen with error message)
   487                              <1> 	; (EIP = 'CD 40h' instruction address -INT 40h-)
   488                              <1> 	; (EAX = Function number)  
   489                              <1> 	;
   490 0000C887 FE05[B2030300]      <1> 	inc	byte [u.bsys]
   491                              <1> 	;
   492 0000C88D 8B1D[5C030300]      <1> 	mov	ebx, [u.sp] ; esp at the beginning of 'sysent'
   493 0000C893 8B03                <1> 	mov	eax, [ebx] ; EIP (return address, not 'INT 30h' address)
   494 0000C895 83E802              <1> 	sub	eax, 2 ; CDh, ##h
   495 0000C898 E8756AFFFF          <1> 	call	dwordtohex
   496 0000C89D 8915[6F140100]      <1> 	mov	[eip_str], edx
   497 0000C8A3 A3[73140100]        <1> 	mov	[eip_str+4], eax
   498 0000C8A8 A1[64030300]        <1> 	mov	eax, [u.r0]
   499 0000C8AD E8606AFFFF          <1> 	call	dwordtohex
   500 0000C8B2 8915[5E140100]      <1> 	mov	[eax_str], edx
   501 0000C8B8 A3[62140100]        <1> 	mov	[eax_str+4], eax
   502                              <1> 
   503 0000C8BD 66C705[53140100]34- <1> 	mov	word [int_num_str], SYSCALL_INT_NUM ; 25/12/2016
   503 0000C8C5 30                  <1>
   504                              <1> 
   505 0000C8C6 BE[25140100]        <1> 	mov	esi, ifc_msg ; "invalid funtion call !" msg (trdosk9.s)
   506 0000C8CB E8FD9AFFFF          <1> 	call	print_msg
   507                              <1> 
   508 0000C8D0 EB17                <1> 	jmp	sysexit
   509                              <1> 
   510                              <1> intract: ; / interrupt action
   511                              <1> 	; 14/10/2015
   512                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - Beginning)
   513                              <1> 	; 09/05/2013 - 07/12/2013 (Retro UNIX 8086 v1)
   514                              <1> 	;
   515                              <1> 	; Retro UNIX 8086 v1 modification !
   516                              <1> 	; (Process/task switching and quit routine by using
   517                              <1> 	; Retro UNIX 8086 v1 keyboard interrupt output.))
   518                              <1> 	;
   519                              <1> 	; input -> 'u.quit'  (also value of 'u.intr' > 0)
   520                              <1> 	; output -> If value of 'u.quit' = FFFFh ('ctrl+brk' sign)
   521                              <1> 	;		'intract' will jump to 'sysexit'.
   522                              <1> 	;	    Intract will return to the caller 
   523                              <1> 	;		if value of 'u.quit' <> FFFFh. 	 
   524                              <1> 	; 14/10/2015
   525 0000C8D2 FB                  <1> 	sti
   526                              <1> 	; 07/12/2013	
   527 0000C8D3 66FF05[AC030300]    <1> 	inc 	word [u.quit]
   528 0000C8DA 7408                <1> 	jz	short intrct0 ; FFFFh -> 0
   529 0000C8DC 66FF0D[AC030300]    <1> 	dec	word [u.quit]
   530                              <1> 	; 16/04/2015
   531 0000C8E3 C3                  <1> 	retn
   532                              <1> intrct0:	
   533 0000C8E4 58                  <1> 	pop	eax ; call intract -> retn
   534                              <1> 	;
   535 0000C8E5 31C0                <1> 	xor 	eax, eax
   536 0000C8E7 FEC0                <1> 	inc	al  ; mov ax, 1
   537                              <1> ;;;
   538                              <1> 	; UNIX v1 original 'intract' routine... 
   539                              <1> 	; / interrupt action
   540                              <1> 		;cmp *(sp),$rti / are you in a clock interrupt?
   541                              <1> 		; bne 1f / no, 1f
   542                              <1> 		; cmp (sp)+,(sp)+ / pop clock pointer
   543                              <1> 	; 1: / now in user area
   544                              <1> 		; mov r1,-(sp) / save r1
   545                              <1> 		; mov u.ttyp,r1 
   546                              <1> 			; / pointer to tty buffer in control-to r1
   547                              <1> 		; cmpb 6(r1),$177
   548                              <1> 			; / is the interrupt char equal to "del"
   549                              <1> 		; beq 1f / yes, 1f
   550                              <1> 		; clrb 6(r1) 
   551                              <1> 		        ; / no, clear the byte 
   552                              <1> 			; / (must be a quit character)
   553                              <1> 		; mov (sp)+,r1 / restore r1
   554                              <1> 		; clr u.quit / clear quit flag
   555                              <1> 		; bis $20,2(sp) 
   556                              <1> 		    	; / set trace for quit (sets t bit of 
   557                              <1> 			; / ps-trace trap)
   558                              <1> 		; rti   ;  / return from interrupt
   559                              <1> 	; 1: / interrupt char = del
   560                              <1> 		; clrb 6(r1) / clear the interrupt byte 
   561                              <1> 			   ; / in the buffer
   562                              <1> 		; mov (sp)+,r1 / restore r1
   563                              <1> 		; cmp u.intr,$core / should control be 
   564                              <1> 				; / transferred to loc core?
   565                              <1> 		; blo 1f
   566                              <1> 		; jmp *u.intr / user to do rti yes, 
   567                              <1> 				; / transfer to loc core
   568                              <1> 	; 1:
   569                              <1> 		; sys 1 / exit
   570                              <1> 
   571                              <1> sysexit: ; <terminate process>
   572                              <1> 	; 14/11/2017
   573                              <1> 	; 27/05/2017
   574                              <1> 	; 10/04/2017
   575                              <1> 	; 26/02/2017, 28/02/2017
   576                              <1> 	; 02/01/2017, 23/01/2017
   577                              <1> 	; 06/06/2016, 10/06/2016
   578                              <1> 	; 19/05/2016, 23/05/2016
   579                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   580                              <1> 	; 16/04/2015 - 01/09/2015 (Retro UNIX 386 v1)
   581                              <1> 	; 19/04/2013 - 14/02/2014 (Retro UNIX 8086 v1)
   582                              <1> 	;
   583                              <1> 	; 'sysexit' terminates a process. First each file that
   584                              <1> 	; the process has opened is closed by 'flose'. The process
   585                              <1> 	; status is then set to unused. The 'p.pid' table is then
   586                              <1> 	; searched to find children of the dying process. If any of
   587                              <1> 	; children are zombies (died by not waited for), they are
   588                              <1> 	; set free. The 'p.pid' table is then searched to find the
   589                              <1> 	; dying process's parent. When the parent is found, it is
   590                              <1> 	; checked to see if it is free or it is a zombie. If it is
   591                              <1> 	; one of these, the dying process just dies. If it is waiting
   592                              <1> 	; for a child process to die, it notified that it doesn't 
   593                              <1> 	; have to wait anymore by setting it's status from 2 to 1
   594                              <1> 	; (waiting to active). It is awakened and put on runq by
   595                              <1> 	; 'putlu'. The dying process enters a zombie state in which
   596                              <1> 	; it will never be run again but stays around until a 'wait'
   597                              <1> 	; is completed by it's parent process. If the parent is not
   598                              <1> 	; found, process just dies. This means 'swap' is called with
   599                              <1> 	; 'u.uno=0'. What this does is the 'wswap' is not called
   600                              <1> 	; to write out the process and 'rswap' reads the new process
   601                              <1> 	; over the one that dies..i.e., the dying process is 
   602                              <1> 	; overwritten and destroyed.	
   603                              <1>  	;
   604                              <1> 	; Calling sequence:
   605                              <1> 	;	sysexit or conditional branch.
   606                              <1> 	; Arguments:
   607                              <1> 	;	-	
   608                              <1> 	; ...............................................................
   609                              <1> 	;	
   610                              <1> 	; Retro UNIX 8086 v1 modification: 
   611                              <1> 	;       System call number (=1) is in EAX register.
   612                              <1> 	;
   613                              <1> 	;       Other parameters are in EDX, EBX, ECX, ESI, EDI, EBP
   614                              <1> 	;       registers depending of function details.
   615                              <1> 	;
   616                              <1> 	; ('swap' procedure is mostly different than original UNIX v1.)
   617                              <1> 	;
   618                              <1> ; / terminate process
   619                              <1> 	; AX = 1
   620 0000C8E9 6648                <1> 	dec 	ax ; 0
   621 0000C8EB 66A3[AA030300]      <1> 	mov	[u.intr], ax ; 0
   622                              <1> 		; clr u.intr / clear interrupt control word
   623                              <1> 		; clr r1 / clear r1
   624                              <1> sysexit_0:
   625                              <1> 	; 23/01/2017
   626                              <1> 	; 02/01/2017
   627                              <1> 	; 10/06/2016
   628                              <1> 	; 06/06/2016
   629                              <1> 	; 23/05/2016
   630                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
   631                              <1> 	; Check and stop/clear timer event(s) of this (dying) process
   632                              <1> 	; if there is.
   633                              <1> 
   634                              <1> 	; 02/01/2017 
   635 0000C8F1 FA                  <1> 	cli	; disable interrupts
   636                              <1> 	; 23/01/2017 - reset timer frequency (to 18.2Hz)
   637 0000C8F2 B036                <1> 	mov	al, 00110110b ; 36h
   638 0000C8F4 E643                <1>  	out	43h, al
   639 0000C8F6 28C0                <1> 	sub	al, al ; 0
   640 0000C8F8 E640                <1> 	out	40h, al ; LB
   641 0000C8FA E640                <1> 	out	40h, al ; HB
   642                              <1>  	; 
   643 0000C8FC 0FB61D[B3030300]    <1> 	movzx	ebx, byte [u.uno]
   644                              <1> 	;mov	bl, [u.uno] ; process number of dying process
   645 0000C903 3883[FF000300]      <1> 	cmp	byte [ebx+p.timer-1], al ; 0
   646 0000C909 763A                <1> 	jna	short sysexit_12 ; no timer events for this process
   647 0000C90B 8883[FF000300]      <1> 	mov	byte [ebx+p.timer-1], al ; 0 ; reset
   648                              <1> 	;mov	al, [timer_events]
   649                              <1> 	;or	al, al
   650                              <1>  	;jz	short sysexit_12 ; no timer events
   651                              <1> 	;mov	cl, al
   652 0000C911 8A0D[53650100]      <1> 	mov	cl, [timer_events] ; 14/11/2017
   653                              <1> 	;cli	; disable interrupts 
   654 0000C917 B410                <1> 	mov	ah, 16 ; number of available timer events
   655 0000C919 BE[60040300]        <1> 	mov	esi, timer_set ; beginning address of timer events
   656                              <1> sysexit_7:
   657 0000C91E 8A06                <1> 	mov	al, [esi] ; process number (of timer event)
   658 0000C920 38D8                <1> 	cmp	al, bl ; process number comparison
   659 0000C922 7411                <1> 	je	short sysexit_10
   660 0000C924 20C0                <1> 	and	al, al
   661 0000C926 7404                <1> 	jz	short sysexit_9
   662                              <1> sysexit_8:
   663 0000C928 FEC9                <1> 	dec	cl
   664 0000C92A 7416                <1> 	jz	short sysexit_11
   665                              <1> sysexit_9:
   666 0000C92C FECC                <1> 	dec	ah
   667 0000C92E 7415                <1> 	jz	short sysexit_12
   668 0000C930 83C610              <1> 	add	esi, 16
   669 0000C933 EBE9                <1> 	jmp	short sysexit_7
   670                              <1> 
   671                              <1> sysexit_10:
   672                              <1> 	;mov	byte [esi], 0
   673 0000C935 66C7060000          <1> 	mov	word [esi], 0
   674                              <1> 	;mov	dword [esi+12], 0
   675                              <1> 	;
   676 0000C93A FE0D[53650100]      <1> 	dec	byte [timer_events] ; 02/01/2017
   677                              <1> 	;
   678 0000C940 EBE6                <1> 	jmp	short sysexit_8
   679                              <1> 
   680                              <1> sysexit_11:
   681 0000C942 6629C0              <1> 	sub	ax, ax ; 0 ; 26/02/2017
   682                              <1> sysexit_12:
   683                              <1> 	; 26/02/2017 (Unlink IRQ callbacks belong to the user)
   684 0000C945 803D[D6030300]00    <1> 	cmp	byte [u.irqc], 0 ; Count of IRQ callbacks
   685 0000C94C 7E2E                <1> 	jng	short sysexit_16 ; zero or invalid
   686                              <1> 	; 28/02/2017
   687                              <1> 	; clear IRQ callback flags (for 'sysrele' and 'sysret')
   688 0000C94E A2[D7030300]        <1> 	mov	[u.irqwait], al ; 0 ; force to clear waiting flag
   689 0000C953 A2[D8030300]        <1> 	mov	[u.r_lock], al ; 0 ; force to clear busy flag
   690 0000C958 BE[F26A0100]        <1> 	mov	esi, IRQ.owner
   691                              <1> sysexit_13:	
   692 0000C95D AC                  <1> 	lodsb
   693 0000C95E 3A05[B3030300]      <1> 	cmp	al, [u.uno] ; owner  = current user ?
   694 0000C964 750C                <1> 	jne	short sysexit_14
   695 0000C966 C646FF00            <1> 	mov	byte [esi-1], 0 ; owner = 0 : Free
   696 0000C96A FE0D[D6030300]      <1> 	dec	byte [u.irqc]
   697 0000C970 7408                <1> 	jz	short sysexit_15
   698                              <1> sysexit_14:
   699 0000C972 81FE[FA6A0100]      <1> 	cmp	esi, IRQ.owner + 8 ; the last IRQ index number ?
   700 0000C978 76E3                <1> 	jna	short sysexit_13 ; no
   701                              <1> sysexit_15:
   702 0000C97A 30C0                <1> 	xor	al, al ; 0
   703                              <1> sysexit_16: ; 2:
   704 0000C97C FB                  <1> 	sti	; enable interrupts 
   705                              <1> 	;
   706                              <1> 	; AX = 0
   707                              <1> sysexit_1: ; 1:
   708                              <1> 	; AX = File descriptor
   709                              <1> 		; / r1 has file descriptor (index to u.fp list)
   710                              <1> 		; / Search the whole list
   711 0000C97D E89A130000          <1> 	call	fclose
   712                              <1> 		; jsr r0,fclose / close all files the process opened
   713                              <1> 	;; ignore error return
   714                              <1> 		; br .+2 / ignore error return
   715                              <1> 	;inc	ax
   716 0000C982 FEC0                <1> 	inc	al
   717                              <1> 		; inc r1 / increment file descriptor
   718                              <1> 	;cmp	ax, 10
   719 0000C984 3C0A                <1> 	cmp	al, 10
   720                              <1> 		; cmp r1,$10. / end of u.fp list?
   721 0000C986 72F5                <1> 	jb	short sysexit_1
   722                              <1> 		; blt 1b / no, go back
   723                              <1> 	;movzx	ebx, byte [u.uno]
   724 0000C988 8A1D[B3030300]      <1> 	mov	bl, [u.uno] ; 02/01/2017
   725                              <1> 		; movb	u.uno,r1 / yes, move dying process's number to r1
   726 0000C98E 88A3[AF000300]      <1> 	mov	[ebx+p.stat-1], ah ; 0, SFREE
   727                              <1> 		; clrb p.stat-1(r1) / free the process
   728                              <1> 	; 10/04/2017
   729 0000C994 381D[696B0100]      <1> 	cmp	[audio_user], bl
   730 0000C99A 7518                <1> 	jne	short sysexit_17
   731                              <1> 	; reset audio device (current) owner and 'initializated' flag
   732 0000C99C 883D[696B0100]      <1> 	mov	[audio_user], bh ; 0
   733                              <1> 	; 27/05/2017
   734 0000C9A2 8B0D[546B0100]      <1> 	mov	ecx,  [audio_buffer]
   735 0000C9A8 09C9                <1> 	or	ecx, ecx
   736 0000C9AA 7408                <1> 	jz	short sysexit_17
   737                              <1> 	; 'deallocate_user_pages' is not necessary in sysexit !!!
   738                              <1> 	;push	ebx
   739                              <1> 	;mov	ebx, ecx
   740                              <1> 	;mov	ecx, [audio_buff_size]
   741                              <1> 	;call	deallocate_user_pages
   742                              <1> 	;; (Modified Registers -> EAX, EDX, ESI, EDI, EBX, ECX, EBP)
   743 0000C9AC 29C9                <1> 	sub	ecx, ecx
   744 0000C9AE 890D[546B0100]      <1> 	mov	[audio_buffer], ecx ; 0
   745                              <1> 	;pop	ebx
   746                              <1> sysexit_17:
   747                              <1> 	;shl	bx, 1
   748 0000C9B4 D0E3                <1> 	shl	bl, 1
   749                              <1> 		; asl r1 / use r1 for index into the below tables
   750 0000C9B6 668B8B[1E000300]    <1> 	mov	cx, [ebx+p.pid-2]
   751                              <1> 		; mov p.pid-2(r1),r3 / move dying process's name to r3
   752 0000C9BD 668B93[3E000300]    <1> 	mov	dx, [ebx+p.ppid-2]
   753                              <1> 		; mov p.ppid-2(r1),r4 / move its parents name to r4
   754                              <1> 	; xor 	bx, bx ; 0
   755 0000C9C4 30DB                <1> 	xor	bl, bl ; 0
   756                              <1> 		; clr r2
   757 0000C9C6 31F6                <1> 	xor	esi, esi ; 0
   758                              <1> 		; clr r5 / initialize reg
   759                              <1> sysexit_2: ; 1:
   760                              <1> 	        ; / find children of this dying process, 
   761                              <1> 		; / if they are zombies, free them
   762                              <1> 	;add	bx, 2
   763 0000C9C8 80C302              <1> 	add	bl, 2
   764                              <1> 		; add $2,r2 / search parent process table 
   765                              <1> 		          ; / for dying process's name
   766 0000C9CB 66398B[3E000300]    <1> 	cmp	[ebx+p.ppid-2], cx
   767                              <1> 		; cmp p.ppid-2(r2),r3 / found it?
   768 0000C9D2 7513                <1> 	jne	short sysexit_4
   769                              <1> 		; bne 3f / no
   770                              <1> 	;shr	bx, 1
   771 0000C9D4 D0EB                <1> 	shr	bl, 1
   772                              <1> 		; asr r2 / yes, it is a parent
   773 0000C9D6 80BB[AF000300]03    <1> 	cmp	byte [ebx+p.stat-1], 3 ; SZOMB
   774                              <1> 		; cmpb p.stat-1(r2),$3 / is the child of this 
   775                              <1> 				     ; / dying process a zombie
   776 0000C9DD 7506                <1> 	jne	short sysexit_3 
   777                              <1> 		; bne 2f / no
   778 0000C9DF 88A3[AF000300]      <1> 	mov	[ebx+p.stat-1], ah ; 0, SFREE
   779                              <1> 		; clrb p.stat-1(r2) / yes, free the child process
   780                              <1> sysexit_3: ; 2:
   781                              <1> 	;shr	bx, 1
   782 0000C9E5 D0E3                <1> 	shl	bl, 1
   783                              <1> 		; asl r2
   784                              <1> sysexit_4: ; 3:
   785                              <1> 		; / search the process name table 
   786                              <1> 		; / for the dying process's parent
   787 0000C9E7 663993[1E000300]    <1> 	cmp	[ebx+p.pid-2], dx
   788                              <1> 		; cmp p.pid-2(r2),r4 / found it?
   789 0000C9EE 7502                <1> 	jne	short sysexit_5
   790                              <1> 		; bne 3f / no
   791 0000C9F0 89DE                <1> 	mov	esi, ebx
   792                              <1> 		; mov r2,r5 / yes, put index to p.pid table (parents
   793                              <1> 		          ; / process # x2) in r5
   794                              <1> sysexit_5: ; 3:
   795                              <1> 	;cmp	bx, nproc + nproc
   796 0000C9F2 80FB20              <1> 	cmp	bl, nproc + nproc
   797                              <1> 		; cmp r2,$nproc+nproc / has whole table been searched?
   798 0000C9F5 72D1                <1> 	jb	short sysexit_2
   799                              <1> 		; blt 1b / no, go back
   800                              <1> 		; mov r5,r1 / yes, r1 now has parents process # x2
   801 0000C9F7 21F6                <1> 	and	esi, esi ; r5=r1
   802 0000C9F9 7436                <1> 	jz	short sysexit_6
   803                              <1> 		; beq 2f / no parent has been found. 
   804                              <1> 		       ; / The process just dies
   805 0000C9FB 66D1EE              <1> 	shr	si, 1
   806                              <1> 		; asr r1 / set up index to p.stat
   807 0000C9FE 8A86[AF000300]      <1> 	mov	al, [esi+p.stat-1]
   808                              <1> 		; movb p.stat-1(r1),r2 / move status of parent to r2
   809 0000CA04 20C0                <1> 	and	al, al
   810 0000CA06 7429                <1> 	jz	short sysexit_6
   811                              <1> 		; beq 2f / if its been freed, 2f
   812 0000CA08 3C03                <1> 	cmp	al, 3
   813                              <1> 		; cmp r2,$3 / is parent a zombie?
   814 0000CA0A 7425                <1> 	je	short sysexit_6
   815                              <1> 		; beq 2f / yes, 2f
   816                              <1> 	; BH = 0
   817 0000CA0C 8A1D[B3030300]      <1> 	mov	bl, [u.uno]
   818                              <1> 		; movb u.uno,r3 / move dying process's number to r3
   819 0000CA12 C683[AF000300]03    <1> 	mov	byte [ebx+p.stat-1], 3  ; SZOMB
   820                              <1> 		; movb $3,p.stat-1(r3) / make the process a zombie
   821 0000CA19 3C01                <1> 	cmp	al, 1 ; SRUN
   822 0000CA1B 7414                <1> 	je	short sysexit_6
   823                              <1> 	;cmp	al, 2
   824                              <1> 		; cmp r2,$2 / is the parent waiting for 
   825                              <1> 			  ; / this child to die
   826                              <1> 	;jne	short sysexit_6	
   827                              <1> 		; bne 2f / yes, notify parent not to wait any more
   828                              <1> 	; p.stat = 2 --> waiting
   829                              <1> 	; p.stat = 4 --> sleeping
   830 0000CA1D C686[AF000300]01    <1> 	mov	byte [esi+p.stat-1], 1 ; SRUN
   831                              <1> 	;dec	byte [esi+p.stat-1]
   832                              <1> 		; decb	p.stat-1(r1) / awaken it by putting it (parent)
   833 0000CA24 6689F0              <1> 	mov	ax, si ; r1  (process number in AL)
   834                              <1> 	; 
   835                              <1> 	;mov	ebx, runq + 4
   836                              <1> 		; mov $runq+4,r2 / on the runq
   837 0000CA27 BB[54030300]        <1> 	mov	ebx, runq+2 ; normal run queue ; 02/01/2017
   838 0000CA2C E8F01C0000          <1> 	call	putlu
   839                              <1> 		; jsr r0, putlu
   840                              <1> sysexit_6: 
   841                              <1> 		; / the process dies
   842 0000CA31 C605[B3030300]00    <1> 	mov	byte [u.uno], 0
   843                              <1> 		; clrb u.uno / put zero as the process number, 
   844                              <1> 	           ; / so "swap" will
   845 0000CA38 E8E61B0000          <1> 	call	swap
   846                              <1> 		; jsr r0,swap / overwrite process with another process
   847                              <1> 
   848                              <1> hlt_sys:
   849                              <1> 	;sti
   850                              <1> hlts0:
   851 0000CA3D F4                  <1> 	hlt
   852 0000CA3E EBFD                <1> 	jmp	short hlts0
   853                              <1> 		; 0 / and thereby kill it; halt?
   854                              <1> 
   855                              <1> syswait: ; < wait for a processs to die >
   856                              <1> 	; 17/09/2015
   857                              <1> 	; 02/09/2015
   858                              <1> 	; 01/09/2015
   859                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - Beginning)
   860                              <1> 	; 24/05/2013 - 05/02/2014 (Retro UNIX 8086 v1)
   861                              <1> 	;
   862                              <1> 	; 'syswait' waits for a process die. 
   863                              <1> 	; It works in following way:
   864                              <1> 	;    1) From the parent process number, the parent's 
   865                              <1> 	; 	process name is found. The p.ppid table of parent
   866                              <1> 	;	names is then searched for this process name.
   867                              <1> 	;	If a match occurs, r2 contains child's process
   868                              <1> 	;	number. The child status is checked to see if it is
   869                              <1> 	;	a zombie, i.e; dead but not waited for (p.stat=3)
   870                              <1> 	;	If it is, the child process is freed and it's name
   871                              <1> 	;	is put in (u.r0). A return is then made via 'sysret'.
   872                              <1> 	;	If the child is not a zombie, nothing happens and
   873                              <1> 	;	the search goes on through the p.ppid table until
   874                              <1> 	;	all processes are checked or a zombie is found.
   875                              <1> 	;    2) If no zombies are found, a check is made to see if
   876                              <1> 	;	there are any children at all. If there are none,
   877                              <1> 	;	an error return is made. If there are, the parent's
   878                              <1> 	;	status is set to 2 (waiting for child to die),
   879                              <1> 	;	the parent is swapped out, and a branch to 'syswait'
   880                              <1> 	;	is made to wait on the next process.
   881                              <1> 	;
   882                              <1> 	; Calling sequence:
   883                              <1> 	;	?
   884                              <1> 	; Arguments:
   885                              <1> 	;	-
   886                              <1> 	; Inputs: - 
   887                              <1> 	; Outputs: if zombie found, it's name put in u.r0.	
   888                              <1> 	; ...............................................................
   889                              <1> 	;				
   890                              <1> 	
   891                              <1> ; / wait for a process to die
   892                              <1> 
   893                              <1> syswait_0:
   894 0000CA40 0FB61D[B3030300]    <1> 	movzx	ebx, byte [u.uno] ; 01/09/2015
   895                              <1> 		; movb u.uno,r1 / put parents process number in r1
   896 0000CA47 D0E3                <1> 	shl	bl, 1
   897                              <1> 	;shl	bx, 1
   898                              <1> 		; asl r1 / x2 to get index into p.pid table
   899 0000CA49 668B83[1E000300]    <1> 	mov	ax, [ebx+p.pid-2]
   900                              <1> 		; mov p.pid-2(r1),r1 / get the name of this process
   901 0000CA50 31F6                <1> 	xor	esi, esi
   902                              <1> 		; clr r2
   903 0000CA52 31C9                <1> 	xor	ecx, ecx ; 30/10/2013
   904                              <1> 	;xor 	cl, cl
   905                              <1> 		; clr r3 / initialize reg 3
   906                              <1> syswait_1: ; 1:
   907 0000CA54 6683C602            <1> 	add	si, 2
   908                              <1> 		; add $2,r2 / use r2 for index into p.ppid table
   909                              <1> 			  ; / search table of parent processes 
   910                              <1> 			  ; / for this process name
   911 0000CA58 663B86[3E000300]    <1> 	cmp	ax, [esi+p.ppid-2]
   912                              <1> 		; cmp p.ppid-2(r2),r1 / r2 will contain the childs 
   913                              <1> 			            ; / process number
   914 0000CA5F 7535                <1> 	jne	short syswait_3
   915                              <1> 		;bne 3f / branch if no match of parent process name
   916                              <1> 	;inc	cx
   917 0000CA61 FEC1                <1> 	inc	cl
   918                              <1> 		;inc r3 / yes, a match, r3 indicates number of children
   919 0000CA63 66D1EE              <1> 	shr	si, 1
   920                              <1> 		; asr r2 / r2/2 to get index to p.stat table
   921                              <1> 	; The possible states ('p.stat' values) of a process are:
   922                              <1> 	;	0 = free or unused
   923                              <1> 	;	1 = active
   924                              <1> 	;	2 = waiting for a child process to die
   925                              <1> 	;	3 = terminated, but not yet waited for (zombie).	
   926 0000CA66 80BE[AF000300]03    <1> 	cmp	byte [esi+p.stat-1], 3 ; SZOMB, 05/02/2014
   927                              <1> 		; cmpb p.stat-1(r2),$3 / is the child process a zombie?
   928 0000CA6D 7524                <1> 	jne	short syswait_2
   929                              <1> 		; bne 2f / no, skip it
   930 0000CA6F 88BE[AF000300]      <1> 	mov	[esi+p.stat-1], bh ; 0
   931                              <1> 		; clrb p.stat-1(r2) / yes, free it
   932 0000CA75 66D1E6              <1> 	shl	si, 1
   933                              <1> 		; asl r2 / r2x2 to get index into p.pid table
   934 0000CA78 0FB786[1E000300]    <1> 	movzx	eax, word [esi+p.pid-2]
   935 0000CA7F A3[64030300]        <1> 	mov	[u.r0], eax
   936                              <1> 		; mov p.pid-2(r2),*u.r0 
   937                              <1> 			      ; / put childs process name in (u.r0)
   938                              <1> 	;
   939                              <1> 	; Retro UNIX 386 v1 modification ! (17/09/2015)
   940                              <1> 	;
   941                              <1> 	; Parent process ID -p.ppid- field (of the child process)
   942                              <1> 	; must be cleared in order to prevent infinitive 'syswait'
   943                              <1> 	; system call loop from the application/program if it calls
   944                              <1> 	; 'syswait' again (mistakenly) while there is not a zombie
   945                              <1> 	; or running child process to wait. ('forktest.s', 17/09/2015)
   946                              <1> 	;
   947                              <1> 	; Note: syswait will return with error if there is not a
   948                              <1> 	;       zombie or running process to wait.	
   949                              <1> 	;
   950 0000CA84 6629C0              <1> 	sub	ax, ax
   951 0000CA87 668986[3E000300]    <1> 	mov 	[esi+p.ppid-2], ax ; 0 ; 17/09/2015
   952 0000CA8E E9D1FCFFFF          <1> 	jmp	sysret0 ; ax = 0
   953                              <1> 	;
   954                              <1> 	;jmp	sysret
   955                              <1> 		; br sysret1 / return cause child is dead
   956                              <1> syswait_2: ; 2:
   957 0000CA93 66D1E6              <1> 	shl	si, 1
   958                              <1> 		; asl r2 / r2x2 to get index into p.ppid table
   959                              <1> syswait_3: ; 3:
   960 0000CA96 6683FE20            <1> 	cmp	si, nproc+nproc
   961                              <1> 		; cmp r2,$nproc+nproc / have all processes been checked?
   962 0000CA9A 72B8                <1> 	jb	short syswait_1
   963                              <1> 		; blt 1b / no, continue search
   964                              <1> 	;and	cx, cx
   965 0000CA9C 20C9                <1> 	and	cl, cl
   966                              <1> 		; tst r3 / one gets here if there are no children 
   967                              <1> 		       ; / or children that are still active
   968                              <1> 	; 30/10/2013
   969 0000CA9E 750B                <1> 	jnz	short syswait_4
   970                              <1> 	;jz	error
   971                              <1> 		; beq error1 / there are no children, error
   972 0000CAA0 890D[64030300]      <1> 	mov	[u.r0], ecx ; 0
   973 0000CAA6 E997FCFFFF          <1> 	jmp	error
   974                              <1> syswait_4:
   975 0000CAAB 8A1D[B3030300]      <1> 	mov	bl, [u.uno]
   976                              <1> 		; movb u.uno,r1 / there are children so put 
   977                              <1> 			      ; / parent process number in r1
   978 0000CAB1 FE83[AF000300]      <1> 	inc	byte [ebx+p.stat-1] ; 2, SWAIT, 05/02/2014
   979                              <1> 		; incb p.stat-1(r1) / it is waiting for 
   980                              <1> 				  ; / other children to die
   981                              <1> 	; 04/11/2013
   982 0000CAB7 E8671B0000          <1> 	call	swap
   983                              <1> 		; jsr r0,swap / swap it out, because it's waiting
   984 0000CABC EB82                <1> 	jmp	syswait_0
   985                              <1> 		; br syswait / wait on next process
   986                              <1> 
   987                              <1> sysfork: ; < create a new process >
   988                              <1> 	; 02/01/2017 (TRDOS 386 modification)
   989                              <1> 	; 04/09/2015, 18/05/2015
   990                              <1> 	; 28/08/2015, 01/09/2015, 02/09/2015
   991                              <1> 	; 09/05/2015, 10/05/2015, 14/05/2015
   992                              <1> 	; 06/05/2015 (Retro UNIX 386 v1 - Beginning)
   993                              <1> 	; 24/05/2013 - 14/02/2014 (Retro UNIX 8086 v1)
   994                              <1> 	;
   995                              <1> 	; 'sysfork' creates a new process. This process is referred
   996                              <1> 	; to as the child process. This new process core image is
   997                              <1> 	; a copy of that of the caller of 'sysfork'. The only
   998                              <1> 	; distinction is the return location and the fact that (u.r0)
   999                              <1> 	; in the old process (parent) contains the process id (p.pid)
  1000                              <1> 	; of the new process (child). This id is used by 'syswait'.
  1001                              <1> 	; 'sysfork' works in the following manner: 	
  1002                              <1> 	;    1) The process status table (p.stat) is searched to find
  1003                              <1> 	;	a process number that is unused. If none are found
  1004                              <1> 	;	an error occurs.
  1005                              <1> 	;    2) when one is found, it becomes the child process number
  1006                              <1> 	;	and it's status (p.stat) is set to active.
  1007                              <1> 	;    3) If the parent had a control tty, the interrupt 
  1008                              <1> 	;	character in that tty buffer is cleared.
  1009                              <1> 	;    4) The child process is put on the lowest priority run 
  1010                              <1> 	;	queue via 'putlu'.
  1011                              <1> 	;    5) A new process name is gotten from 'mpid' (actually 
  1012                              <1> 	;	it is a unique number) and is put in the child's unique
  1013                              <1> 	;	identifier; process id (p.pid).
  1014                              <1> 	;    6) The process name of the parent is then obtained and
  1015                              <1> 	;	placed in the unique identifier of the parent process
  1016                              <1> 	;	name is then put in 'u.r0'.	
  1017                              <1> 	;    7) The child process is then written out on disk by
  1018                              <1> 	;	'wswap',i.e., the parent process is copied onto disk
  1019                              <1> 	;	and the child is born. (The child process is written 
  1020                              <1> 	;	out on disk/drum with 'u.uno' being the child process
  1021                              <1> 	;	number.)
  1022                              <1> 	;    8) The parent process number is then restored to 'u.uno'.
  1023                              <1> 	;    9) The child process name is put in 'u.r0'.
  1024                              <1> 	;   10) The pc on the stack sp + 18 is incremented by 2 to
  1025                              <1> 	;	create the return address for the parent process.
  1026                              <1> 	;   11) The 'u.fp' list as then searched to see what files
  1027                              <1> 	;	the parent has opened. For each file the parent has
  1028                              <1> 	;	opened, the corresponding 'fsp' entry must be updated
  1029                              <1> 	;	to indicate that the child process also has opened
  1030                              <1> 	;	the file. A branch to 'sysret' is then made.	 			 				
  1031                              <1> 	;
  1032                              <1> 	; Calling sequence:
  1033                              <1> 	;	from shell ?
  1034                              <1> 	; Arguments:
  1035                              <1> 	;	-
  1036                              <1> 	; Inputs: -
  1037                              <1> 	; Outputs: *u.r0 - child process name
  1038                              <1> 	; ...............................................................
  1039                              <1> 	;	
  1040                              <1> 	; Retro UNIX 8086 v1 modification: 
  1041                              <1> 	;	AX = r0 = PID (>0) (at the return of 'sysfork')
  1042                              <1> 	;	= process id of child a parent process returns
  1043                              <1> 	;	= process id of parent when a child process returns
  1044                              <1> 	;
  1045                              <1> 	;       In original UNIX v1, sysfork is called and returns as
  1046                              <1> 	;	in following manner: (with an example: c library, fork)
  1047                              <1> 	;	
  1048                              <1> 	;	1:
  1049                              <1> 	;		sys	fork
  1050                              <1> 	;			br 1f  / child process returns here
  1051                              <1> 	;		bes	2f     / parent process returns here
  1052                              <1> 	;		/ pid of new process in r0
  1053                              <1> 	;		rts	pc
  1054                              <1> 	;	2: / parent process condionally branches here
  1055                              <1> 	;		mov	$-1,r0 / pid = -1 means error return
  1056                              <1> 	;		rts	pc
  1057                              <1> 	;
  1058                              <1> 	;	1: / child process brances here
  1059                              <1> 	;		clr	r0   / pid = 0 in child process
  1060                              <1> 	;		rts	pc
  1061                              <1> 	;
  1062                              <1> 	;	In UNIX v7x86 (386) by Robert Nordier (1999)
  1063                              <1> 	;		// pid = fork();
  1064                              <1> 	;		//
  1065                              <1> 	;		// pid == 0 in child process; 
  1066                              <1> 	;		// pid == -1 means error return
  1067                              <1> 	;		// in child, 
  1068                              <1> 	;		//	parents id is in par_uid if needed
  1069                              <1> 	;		
  1070                              <1> 	;		_fork:
  1071                              <1> 	;			mov	$.fork,eax
  1072                              <1> 	;			int	$0x30
  1073                              <1> 	;			jmp	1f
  1074                              <1> 	;			jnc	2f
  1075                              <1> 	;			jmp	cerror
  1076                              <1> 	;		1:
  1077                              <1> 	;			mov	eax,_par_uid
  1078                              <1> 	;			xor	eax,eax
  1079                              <1> 	;		2:
  1080                              <1> 	;			ret
  1081                              <1> 	;
  1082                              <1> 	;	In Retro UNIX 8086 v1,
  1083                              <1> 	;	'sysfork' returns in following manner:
  1084                              <1> 	;	
  1085                              <1> 	;		mov	ax, sys_fork
  1086                              <1> 	;		mov	bx, offset @f ; routine for child
  1087                              <1> 	;		int	20h
  1088                              <1> 	;		jc	error
  1089                              <1> 	;		
  1090                              <1> 	;	; Routine for parent process here (just after 'jc')
  1091                              <1> 	;		mov	word ptr [pid_of_child], ax
  1092                              <1> 	;		jmp	next_routine_for_parent	
  1093                              <1> 	;
  1094                              <1> 	;	@@: ; routine for child process here				
  1095                              <1> 	;		....	
  1096                              <1> 	;	NOTE: 'sysfork' returns to specified offset
  1097                              <1> 	;	       for child process by using BX input.
  1098                              <1> 	;	      (at first, parent process will return then 
  1099                              <1> 	;	      child process will return -after swapped in-
  1100                              <1> 	;	      'syswait' is needed in parent process
  1101                              <1> 	;	      if return from child process will be waited for.)
  1102                              <1> 	;	  				
  1103                              <1> 	
  1104                              <1> ; / create a new process
  1105                              <1> 	; EBX = return address for child process 
  1106                              <1> 	     ; (Retro UNIX 8086 v1 modification !)
  1107 0000CABE 31F6                <1> 	xor 	esi, esi
  1108                              <1> 		; clr r1
  1109                              <1> sysfork_1: ; 1: / search p.stat table for unused process number
  1110 0000CAC0 46                  <1> 	inc	esi
  1111                              <1> 		; inc r1
  1112 0000CAC1 80BE[AF000300]00    <1> 	cmp	byte [esi+p.stat-1], 0 ; SFREE, 05/02/2014
  1113                              <1> 		; tstb p.stat-1(r1) / is process active, unused, dead
  1114 0000CAC8 760B                <1> 	jna	short sysfork_2	
  1115                              <1> 		; beq 1f / it's unused so branch
  1116 0000CACA 6683FE10            <1> 	cmp	si, nproc
  1117                              <1> 		; cmp r1,$nproc / all processes checked
  1118 0000CACE 72F0                <1> 	jb	short sysfork_1
  1119                              <1> 		; blt 1b / no, branch back
  1120                              <1> 	;
  1121                              <1> 	; Retro UNIX 8086 v1. modification:
  1122                              <1> 	;	Parent process returns from 'sysfork' to address 
  1123                              <1> 	;	which is just after 'sysfork' system call in parent
  1124                              <1> 	;	process. Child process returns to address which is put
  1125                              <1> 	;	in BX register by parent process for 'sysfork'. 
  1126                              <1> 	;
  1127                              <1> 		;add $2,18.(sp) / add 2 to pc when trap occured, points
  1128                              <1> 		             ; / to old process return
  1129                              <1> 		; br error1 / no room for a new process
  1130 0000CAD0 E96DFCFFFF          <1> 	jmp	error
  1131                              <1> sysfork_2: ; 1:
  1132 0000CAD5 E8FD80FFFF          <1> 	call	allocate_page
  1133 0000CADA 0F8262FCFFFF        <1> 	jc	error
  1134 0000CAE0 50                  <1> 	push	eax   ; UPAGE (user structure page) address
  1135                              <1> 	; Retro UNIX 386 v1 modification!
  1136 0000CAE1 E80083FFFF          <1> 	call	duplicate_page_dir
  1137                              <1> 		; EAX = New page directory 
  1138 0000CAE6 730B                <1> 	jnc	short sysfork_3
  1139 0000CAE8 58                  <1> 	pop	eax   ; UPAGE (user structure page) address
  1140 0000CAE9 E8C782FFFF          <1> 	call 	deallocate_page
  1141 0000CAEE E94FFCFFFF          <1> 	jmp	error
  1142                              <1> sysfork_3:
  1143                              <1> 	; Retro UNIX 386 v1 modification !
  1144 0000CAF3 56                  <1> 	push	esi
  1145 0000CAF4 E8B81B0000          <1> 	call	wswap ; save current user (u) structure, user registers
  1146                              <1> 		      ; and interrupt return components (for IRET)
  1147 0000CAF9 8705[B8030300]      <1> 	xchg	eax, [u.pgdir] ; page directory of the child process
  1148 0000CAFF A3[BC030300]        <1> 	mov	[u.ppgdir], eax ; page directory of the parent process
  1149 0000CB04 5E                  <1> 	pop	esi
  1150 0000CB05 58                  <1> 	pop	eax   ; UPAGE (user structure page) address
  1151                              <1> 		; [u.usp] = esp
  1152 0000CB06 89F7                <1> 	mov	edi, esi
  1153 0000CB08 66C1E702            <1> 	shl	di, 2
  1154 0000CB0C 8987[BC000300]      <1> 	mov	[edi+p.upage-4], eax ; memory page for 'user' struct
  1155 0000CB12 A3[B4030300]        <1> 	mov	[u.upage], eax ; memory page for 'user' struct (child)
  1156                              <1> 	; 28/08/2015
  1157 0000CB17 0FB605[B3030300]    <1> 	movzx	eax, byte [u.uno] ; parent process number
  1158                              <1> 		; movb u.uno,-(sp) / save parent process number
  1159 0000CB1E 89C7                <1> 	mov	edi, eax
  1160 0000CB20 50                  <1>         push	eax ; ** 
  1161 0000CB21 8A87[7F000300]      <1> 	mov     al, [edi+p.ttyc-1] ; console tty (parent)
  1162                              <1> 	; 18/09/2015
  1163                              <1> 	;mov     [esi+p.ttyc-1], al ; set child's console tty
  1164                              <1> 	;mov     [esi+p.waitc-1], ah ; 0 ; reset child's wait channel
  1165 0000CB27 668986[7F000300]    <1> 	mov     [esi+p.ttyc-1], ax ; al - set child's console tty
  1166                              <1> 				   ; ah - reset child's wait channel	
  1167 0000CB2E 89F0                <1> 	mov	eax, esi
  1168 0000CB30 A2[B3030300]        <1> 	mov	[u.uno], al ; child process number
  1169                              <1> 		;movb r1,u.uno / set child process number to r1
  1170 0000CB35 FE86[AF000300]      <1>         inc     byte [esi+p.stat-1] ; 1, SRUN, 05/02/2014
  1171                              <1> 		; incb p.stat-1(r1) / set p.stat entry for child 
  1172                              <1> 				; / process to active status
  1173                              <1> 		; mov u.ttyp,r2 / put pointer to parent process' 
  1174                              <1> 			      ; / control tty buffer in r2
  1175                              <1>                 ; beq 2f / branch, if no such tty assigned
  1176                              <1> 		; clrb 6(r2) / clear interrupt character in tty buffer
  1177                              <1> 	; 2:
  1178 0000CB3B 53                  <1> 	push	ebx  ; * return address for the child process
  1179                              <1> 		     ; * Retro UNIX 8086 v1 feature only !	
  1180                              <1> 	; (Retro UNIX 8086 v1 modification!)
  1181                              <1> 		; mov $runq+4,r2
  1182 0000CB3C BB[54030300]        <1> 	mov	ebx, runq+2 ; normal run queue ; 02/01/2017  
  1183 0000CB41 E8DB1B0000          <1> 	call	putlu
  1184                              <1>  		; jsr r0,putlu / put child process on lowest priority 
  1185                              <1> 			   ; / run queue
  1186 0000CB46 66D1E6              <1> 	shl	si, 1
  1187                              <1> 		; asl r1 / multiply r1 by 2 to get index 
  1188                              <1> 		       ; / into p.pid table
  1189 0000CB49 66FF05[4E030300]    <1> 	inc	word [mpid]
  1190                              <1> 		; inc mpid / increment m.pid; get a new process name
  1191 0000CB50 66A1[4E030300]      <1> 	mov	ax, [mpid]
  1192 0000CB56 668986[1E000300]    <1> 	mov	[esi+p.pid-2], ax
  1193                              <1> 		;mov mpid,p.pid-2(r1) / put new process name 
  1194                              <1> 				    ; / in child process' name slot
  1195 0000CB5D 5A                  <1> 	pop	edx  ; * return address for the child process
  1196                              <1> 		     ; * Retro UNIX 8086 v1 feature only !	
  1197 0000CB5E 5B                  <1>   	pop	ebx  ; **
  1198                              <1> 	;mov	ebx, [esp] ; ** parent process number
  1199                              <1> 		; movb (sp),r2 / put parent process number in r2
  1200 0000CB5F 66D1E3              <1> 	shl 	bx, 1
  1201                              <1> 		;asl r2 / multiply by 2 to get index into below tables
  1202                              <1> 	;movzx eax, word [ebx+p.pid-2]
  1203 0000CB62 668B83[1E000300]    <1> 	mov	ax, [ebx+p.pid-2]
  1204                              <1> 		; mov p.pid-2(r2),r2 / get process name of parent
  1205                              <1> 				   ; / process
  1206 0000CB69 668986[3E000300]    <1> 	mov	[esi+p.ppid-2], ax
  1207                              <1> 		; mov r2,p.ppid-2(r1) / put parent process name 
  1208                              <1> 			  ; / in parent process slot for child
  1209 0000CB70 A3[64030300]        <1> 	mov	[u.r0], eax	
  1210                              <1> 		; mov r2,*u.r0 / put parent process name on stack 
  1211                              <1> 			     ; / at location where r0 was saved
  1212 0000CB75 8B2D[5C030300]      <1> 	mov 	ebp, [u.sp] ; points to return address (EIP for IRET)
  1213 0000CB7B 895500              <1> 	mov	[ebp], edx ; *, CS:EIP -> EIP
  1214                              <1> 			   ; * return address for the child process
  1215                              <1> 		; mov $sysret1,-(sp) /
  1216                              <1> 		; mov sp,u.usp / contents of sp at the time when 
  1217                              <1> 			      ; / user is swapped out
  1218                              <1> 		; mov $sstack,sp / point sp to swapping stack space
  1219                              <1> 	; 04/09/2015 - 01/09/2015
  1220                              <1> 	; [u.usp] = esp
  1221 0000CB7E 68[62C70000]        <1> 	push	sysret ; ***
  1222 0000CB83 8925[60030300]      <1> 	mov	[u.usp], esp ; points to 'sysret' address (***)
  1223                              <1> 			     ; (for child process)	
  1224 0000CB89 31C0                <1> 	xor 	eax, eax
  1225 0000CB8B 66A3[94030300]      <1> 	mov 	[u.ttyp], ax ; 0
  1226                              <1> 	;
  1227 0000CB91 E81B1B0000          <1> 	call	wswap ; Retro UNIX 8086 v1 modification !
  1228                              <1> 		;jsr r0,wswap / put child process out on drum
  1229                              <1> 		;jsr r0,unpack / unpack user stack
  1230                              <1> 		;mov u.usp,sp / restore user stack pointer
  1231                              <1> 		; tst (sp)+ / bump stack pointer
  1232                              <1> 	; Retro UNIX 386 v1 modification !
  1233 0000CB96 58                  <1> 	pop	eax ; ***
  1234 0000CB97 66D1E3              <1> 	shl	bx, 1
  1235 0000CB9A 8B83[BC000300]      <1> 	mov     eax, [ebx+p.upage-4] ; UPAGE address ; 14/05/2015
  1236 0000CBA0 E8441B0000          <1> 	call	rswap ; restore parent process 'u' structure, 
  1237                              <1> 		      ; registers and return address (for IRET)
  1238                              <1> 		;movb (sp)+,u.uno / put parent process number in u.uno
  1239 0000CBA5 0FB705[4E030300]    <1>         movzx   eax, word [mpid]
  1240 0000CBAC A3[64030300]        <1> 	mov	[u.r0], eax
  1241                              <1> 		; mov mpid,*u.r0 / put child process name on stack 
  1242                              <1> 			       ; / where r0 was saved
  1243                              <1> 		; add $2,18.(sp) / add 2 to pc on stack; gives parent
  1244                              <1> 			          ; / process return
  1245                              <1> 	;xor	ebx, ebx
  1246 0000CBB1 31F6                <1> 	xor     esi, esi
  1247                              <1> 		;clr r1
  1248                              <1> sysfork_4: ; 1: / search u.fp list to find the files 
  1249                              <1> 	      ; / opened by the parent process
  1250                              <1> 	; 01/09/2015
  1251                              <1> 	;xor	bh, bh
  1252                              <1> 	;mov 	bl, [esi+u.fp]
  1253 0000CBB3 8A86[6A030300]      <1> 	mov 	al, [esi+u.fp]
  1254                              <1> 		; movb u.fp(r1),r2 / get an open file for this process
  1255                              <1>         ;or      bl, bl
  1256 0000CBB9 08C0                <1> 	or	al, al
  1257 0000CBBB 740D                <1> 	jz	short sysfork_5	
  1258                              <1> 		; beq 2f / file has not been opened by parent, 
  1259                              <1> 		       ; / so branch
  1260 0000CBBD B40A                <1> 	mov	ah, 10 ; Retro UNIX 386 v1 fsp structure size = 10 bytes
  1261 0000CBBF F6E4                <1> 	mul	ah
  1262                              <1> 	;movzx	ebx, ax
  1263 0000CBC1 6689C3              <1> 	mov	bx, ax
  1264                              <1> 	;shl     bx, 3
  1265                              <1> 		; asl r2 / multiply by 8
  1266                              <1>        		; asl r2 / to get index into fsp table
  1267                              <1>        		; asl r2
  1268 0000CBC4 FE83[4E010300]      <1>   	inc     byte [ebx+fsp-2]
  1269                              <1> 		; incb fsp-2(r2) / increment number of processes
  1270                              <1> 			     ; / using file, because child will now be
  1271                              <1> 			     ; / using this file
  1272                              <1> sysfork_5: ; 2:
  1273 0000CBCA 46                  <1>         inc     esi
  1274                              <1> 		; inc r1 / get next open file
  1275 0000CBCB 6683FE0A            <1>         cmp     si, 10
  1276                              <1> 		; cmp r1,$10. / 10. files is the maximum number which
  1277                              <1> 			  ; / can be opened
  1278 0000CBCF 72E2                <1> 	jb	short sysfork_4	
  1279                              <1> 		; blt 1b / check next entry
  1280 0000CBD1 E98CFBFFFF          <1> 	jmp	sysret
  1281                              <1> 		; br sysret1
  1282                              <1> 
  1283                              <1> syscreat: ; < create file >
  1284                              <1> 	; 13/11/2017
  1285                              <1> 	; 27/10/2016
  1286                              <1> 	; 25/10/2016, 26/10/2016
  1287                              <1> 	; 15/10/2016, 16/10/2016, 17/10/2016
  1288                              <1> 	; 10/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1289                              <1> 	;	     -derived from INT_21H.ASM-
  1290                              <1> 	;            ("loc_INT21h_create_file")
  1291                              <1>         ; 	10/07/2011 (12/03/2011)
  1292                              <1>         ;	INT 21h Function AH = 3Ch
  1293                              <1>         ;	Create File
  1294                              <1>         ;	INPUT
  1295                              <1>         ;	   CX = Attributes
  1296                              <1>         ;          DS:DX= Address of zero terminaned path name
  1297                              <1>         ;
  1298                              <1> 	; 27/12/2015 (Retro UNIX 386 v1.1)
  1299                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1300                              <1> 	; 27/05/2013 (Retro UNIX 8086 v1)
  1301                              <1> 	;
  1302                              <1> 	; 'syscreat' called with two arguments; name and mode.
  1303                              <1> 	; u.namep points to name of the file and mode is put
  1304                              <1> 	; on the stack. 'namei' is called to get i-number of the file.		
  1305                              <1> 	; If the file aready exists, it's mode and owner remain 
  1306                              <1> 	; unchanged, but it is truncated to zero length. If the file
  1307                              <1> 	; did not exist, an i-node is created with the new mode via
  1308                              <1> 	; 'maknod' whether or not the file already existed, it is
  1309                              <1> 	; open for writing. The fsp table is then searched for a free
  1310                              <1> 	; entry. When a free entry is found, proper data is placed
  1311                              <1> 	; in it and the number of this entry is put in the u.fp list.
  1312                              <1> 	; The index to the u.fp (also know as the file descriptor)
  1313                              <1> 	; is put in the user's r0. 			
  1314                              <1> 	;
  1315                              <1> 	; Calling sequence:
  1316                              <1> 	;	syscreate; name; mode
  1317                              <1> 	; Arguments:
  1318                              <1> 	;	name - name of the file to be created
  1319                              <1> 	;	mode - mode of the file to be created
  1320                              <1> 	; Inputs: (arguments)
  1321                              <1> 	; Outputs: *u.r0 - index to u.fp list 
  1322                              <1> 	;		   (the file descriptor of new file)
  1323                              <1> 	; ...............................................................
  1324                              <1> 	;				
  1325                              <1> 	; Retro UNIX 8086 v1 modification: 
  1326                              <1> 	;       'syscreate' system call has two arguments; so,
  1327                              <1> 	;	* 1st argument, name is pointed to by BX register
  1328                              <1> 	;	* 2nd argument, mode is in CX register
  1329                              <1> 	;
  1330                              <1> 	;	AX register (will be restored via 'u.r0') will return
  1331                              <1> 	;	to the user with the file descriptor/number 
  1332                              <1> 	;	(index to u.fp list).
  1333                              <1> 	;
  1334                              <1> 	;call	arg2
  1335                              <1> 	; * name - 'u.namep' points to address of file/path name
  1336                              <1> 	;          in the user's program segment ('u.segmnt')
  1337                              <1> 	;          with offset in BX register (as sysopen argument 1).
  1338                              <1> 	; * mode - sysopen argument 2 is in CX register 
  1339                              <1> 	;          which is on top of stack.
  1340                              <1> 	;
  1341                              <1> 	; TRDOS 386 (10/10/2016)
  1342                              <1> 	;	
  1343                              <1>         ; INPUT ->
  1344                              <1>         ;	   CL = File Attributes
  1345                              <1> 	;     	      bit 0 (1) - Read only file (R)
  1346                              <1> 	;             bit 1 (1) - Hidden file (H)
  1347                              <1>         ;             bit 2 (1) - System file (R)
  1348                              <1> 	;             bit 3 (1) - Volume label/name (V)
  1349                              <1>         ;             bit 4 (1) - Subdirectory (D)
  1350                              <1> 	;	      bit 5 (1) - File has been archived (A)	 	
  1351                              <1>         ;          EBX = Pointer to filename (ASCIIZ) -path-
  1352                              <1> 	;	
  1353                              <1> 	; OUTPUT ->
  1354                              <1> 	;          eax = File/Device Handle/Number (index) (AL)
  1355                              <1> 	;          cf = 1 -> Error code in AL
  1356                              <1> 	;
  1357                              <1> 	; Modified Registers: EAX (at the return of system call)
  1358                              <1> 	;  
  1359                              <1> 	; Note: If the file is existing and it has not any one
  1360                              <1> 	;	of S,H,R,V,D attributes, it will be truncated 
  1361                              <1> 	;	to zero length; otherwise, access error will be 
  1362                              <1> 	;	returned. 
  1363                              <1> 
  1364                              <1> sysmkdir_0:
  1365 0000CBD6 F6C108              <1> 	test	cl, 08h ; Volume name 
  1366 0000CBD9 740A                <1> 	jz	short syscreat_0
  1367                              <1> 
  1368                              <1> 	; Volume name or long name creation
  1369                              <1> 	; is not permitted (in TRDOS 386)!
  1370 0000CBDB B80B000000          <1> 	mov	eax, ERR_FILE_ACCESS  ; 11 ; 'permission denied !'
  1371 0000CBE0 E926020000          <1>         jmp	sysopen_dev_err
  1372                              <1> 
  1373                              <1> syscreat_0:
  1374                              <1>         ;mov	[u.namep], ebx
  1375 0000CBE5 51                  <1> 	push	ecx
  1376 0000CBE6 89DE                <1> 	mov	esi, ebx
  1377                              <1> 	; file name is forced, change directory as temporary
  1378                              <1> 	;mov	ax, 1
  1379                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
  1380                              <1> 	;call	set_working_path 
  1381 0000CBE8 E892300000          <1> 	call	set_working_path_x ; 17/10/2016	
  1382 0000CBED 0F82D7000000        <1> 	jc	syscreat_err
  1383                              <1> 
  1384                              <1> 	; 16/10/2016
  1385 0000CBF3 803D[77650100]00    <1> 	cmp	byte [SWP_inv_fname], 0
  1386 0000CBFA 776C                <1> 	ja	short  syscreat_inv_fname ; invalid file name !
  1387                              <1> 
  1388                              <1> 	; Here, we have a valid path and also a valid file name
  1389                              <1> 	; (Working dir has been changed if the path
  1390                              <1> 	;  -file name string- had contained a dir name.)
  1391                              <1> 
  1392 0000CBFC 6631C0              <1> 	xor	ax, ax 
  1393                              <1> 	;mov	esi, FindFile_Name
  1394 0000CBFF E8E3B6FFFF          <1> 	call	find_first_file
  1395 0000CC04 59                  <1> 	pop	ecx
  1396                              <1> 		; ESI = Directory Entry (FindFile_DirEntry) Location
  1397                              <1> 		; EDI = Directory Buffer Directory Entry Location
  1398                              <1> 		; EAX = File Size
  1399                              <1> 		;  BL = Attributes of The File/Directory
  1400                              <1> 		;  BH = Long Name Yes/No Status (>0 is YES)
  1401                              <1> 		;  DX > 0 : Ambiguous filename chars are used
  1402 0000CC05 7269                <1> 	jc	short syscreat_1 ; file not found (the good!) 
  1403                              <1> 				 ; or another error (the bad') 
  1404                              <1> 
  1405                              <1> 	; (& the uggly!) truncate file to zero length before open
  1406                              <1> 
  1407                              <1> 	;'*' and '?' already checked at 'set_working_path' stage
  1408                              <1> 	;and	dx, dx
  1409                              <1> 	;jnz	short sysmkdir_err ; permission denied 
  1410                              <1> 				   ; invalid filename chars
  1411                              <1> 
  1412                              <1> 	;test	cl, 10h ; subdirectory ?
  1413                              <1> 	;jnz	short sysmkdir_err	
  1414                              <1> 
  1415                              <1> 	; BL = File Attributes:	
  1416                              <1> 	;     	      bit 0 (1) - Read only file (R)
  1417                              <1> 	;             bit 1 (1) - Hidden file (H)
  1418                              <1>         ;             bit 2 (1) - System file (R)
  1419                              <1> 	;             bit 3 (1) - Volume label/name (V)
  1420                              <1>         ;             bit 4 (1) - Subdirectory (D)
  1421                              <1> 	;	      bit 5 (1) - File has been archived	 	
  1422                              <1> 
  1423                              <1> 	; * existing directory must not be truncated
  1424                              <1> 	;   (we don't know it is empty or not, at this stage) 
  1425                              <1> 	; * existing volume name (or a long name) can not be
  1426                              <1> 	;   re-created or truncated by 'syscreat' 	
  1427                              <1> 	; * A file with S, H, R attributes must not be truncated
  1428                              <1> 	;   (change attributes to normal, if you need truncate it)
  1429                              <1> 
  1430 0000CC07 F6C31F              <1> 	test	bl, 00011111b  ; check attributes of existing file
  1431 0000CC0A 754E                <1> 	jnz	short sysmkdir_err
  1432                              <1> 
  1433                              <1> 	;; normal file, OK to continue...
  1434                              <1> 
  1435                              <1> 	; ESI = FindFile_DirEntry
  1436 0000CC0C 668B4614            <1> 	mov	ax, [esi+DirEntry_FstClusHI] ; 20
  1437 0000CC10 C1E010              <1> 	shl	eax, 16 ; 13/11/2017
  1438 0000CC13 668B461A            <1> 	mov	ax, [esi+DirEntry_FstClusLO] ; 26 
  1439                              <1> 	; EAX = First cluster to be truncated/unlinked
  1440 0000CC17 57                  <1> 	push	edi
  1441 0000CC18 51                  <1> 	push	ecx
  1442 0000CC19 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  1443 0000CC1E 29C9                <1> 	sub	ecx, ecx
  1444 0000CC20 8A2D[86590100]      <1> 	mov	ch, [Current_Drv]
  1445 0000CC26 01CE                <1> 	add	esi, ecx
  1446                              <1> 	; ESI = Logical dos drive description table address
  1447 0000CC28 E8C9F7FFFF          <1> 	call	truncate_cluster_chain
  1448 0000CC2D 59                  <1> 	pop	ecx
  1449 0000CC2E 5F                  <1> 	pop	edi
  1450 0000CC2F 7230                <1> 	jc	short syscreate_truncate_err
  1451                              <1> 
  1452                              <1> 	; 26/10/2016
  1453                              <1> 	; EDI = Directory entry address in directory buffer
  1454                              <1> 	; Update directory entry
  1455 0000CC31 E848DCFFFF          <1> 	call	convert_current_date_time
  1456                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  1457                              <1>         ; 	    AX = Time in dos dir entry format	
  1458 0000CC36 66894716            <1> 	mov	[edi+DirEntry_WrtTime], ax
  1459 0000CC3A 66895718            <1> 	mov	[edi+DirEntry_WrtDate], dx	
  1460 0000CC3E 66895712            <1> 	mov	[edi+DirEntry_LastAccDate], dx
  1461 0000CC42 31C0                <1> 	xor	eax, eax ; file size = 0 
  1462 0000CC44 89471C              <1> 	mov	[edi+DirEntry_FileSize], eax ; 0
  1463 0000CC47 C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2 ; data changed sign	
  1464 0000CC4E BE[78620100]        <1> 	mov	esi, FindFile_DirEntry
  1465 0000CC53 B201                <1> 	mov	dl, 1 ; open file for writing
  1466 0000CC55 E9AA000000          <1> 	jmp	sysopen_2
  1467                              <1> 
  1468                              <1> sysmkdir_err:
  1469                              <1> 	; 1 = write, 2 = read & write, >2 = invalid
  1470 0000CC5A B80B000000          <1>         mov	eax, ERR_FILE_ACCESS  ; 11 ; 'permission denied !'
  1471 0000CC5F EB73                <1>         jmp	short sysopen_err
  1472                              <1> 
  1473                              <1> syscreate_truncate_err:
  1474 0000CC61 B812000000          <1> 	mov	eax, ERR_DRV_WRITE ; 18 ; 'disk write error !'
  1475 0000CC66 EB6C                <1>         jmp	short sysopen_err
  1476                              <1> 
  1477                              <1> syscreat_inv_fname:  ; invalid file name chars 
  1478                              <1> 	; 16/10/2016
  1479 0000CC68 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME  ; 26 ; invalid file name chars 
  1480 0000CC6D 59                  <1> 	pop	ecx
  1481 0000CC6E EB64                <1> 	jmp	sysopen_err
  1482                              <1> 
  1483                              <1> syscreat_1:
  1484                              <1> 	; Error code in EAX
  1485 0000CC70 3C02                <1>         cmp	al, 02h ; 'File not found' error
  1486 0000CC72 7560                <1>         jne	sysopen_err
  1487                              <1> 
  1488 0000CC74 F6C110              <1> 	test	cl, 10h ; Directory
  1489 0000CC77 0F852C020000        <1> 	jnz	sysmkdir_2
  1490                              <1> 
  1491                              <1> syscreat_2:
  1492 0000CC7D BE[68620100]        <1> 	mov	esi, FindFile_Name 
  1493                              <1>         ;xor	edx, edx
  1494 0000CC82 31C0                <1>         xor	eax, eax ; File Size  = 0
  1495 0000CC84 31DB                <1> 	xor	ebx, ebx
  1496 0000CC86 4B                  <1> 	dec 	ebx ; FFFFFFFFh -> create empty file 
  1497                              <1> 	            ;              (only for FAT fs) 
  1498                              <1> 	; CL = File Attributes
  1499 0000CC87 E8F8EBFFFF          <1> 	call	create_file
  1500 0000CC8C 7246                <1> 	jc	sysopen_err
  1501                              <1> 		; EAX = New file's first cluster
  1502                              <1> 		; ESI = Logical Dos Drv Descr. Table Addr.
  1503                              <1> 		; EBX = offset CreateFile_Size
  1504                              <1> 		; ECX = Sectors per cluster (<256) 
  1505                              <1> 		; EDX = Directory entry index/number (<65536)
  1506                              <1> 	; 26/10/2016
  1507                              <1> 	;mov	esi, Directory_Buffer
  1508                              <1> 	;shl	dx, 5 ; *32
  1509                              <1> 	;add	esi, edx
  1510                              <1> 	;; esi = directory entry address in directory buffer
  1511                              <1> 
  1512                              <1> 	; Here, directory entry has been created but last
  1513                              <1> 	; modification date & time of the parent dir has not
  1514                              <1> 	; been updated, yet! 
  1515                              <1> 	; (Note: Directory and FAT buffers have been updated...)
  1516                              <1>  	
  1517 0000CC8E E824DDFFFF          <1> 	call	update_parent_dir_lmdt ; now, it is OK too!
  1518                              <1> 
  1519                              <1> 	; 25/10/2016
  1520 0000CC93 66B80018            <1> 	mov	ax, 1800h
  1521 0000CC97 BE[68620100]        <1> 	mov	esi, FindFile_Name
  1522 0000CC9C E846B6FFFF          <1> 	call	find_first_file
  1523 0000CCA1 7231                <1> 	jc	short sysopen_err
  1524                              <1> 
  1525                              <1> 	; Only possible error after here is 
  1526                              <1> 	; "too many open files !" error.
  1527                              <1> 	;
  1528                              <1> 	; If "syscreat" will return with that error,
  1529                              <1> 	; (the file has been created but it could not be opened)
  1530                              <1> 	; the user must retry to open this file again
  1531                              <1> 	; or must close another file before using 
  1532                              <1> 	; "sysopen" system call.
  1533                              <1> 
  1534 0000CCA3 B201                <1> 	mov	dl, 1 ; open file for writing
  1535                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
  1536                              <1> 	; EAX = File Size (= 0)
  1537 0000CCA5 EB5D                <1> 	jmp	short sysopen_2
  1538                              <1> 
  1539                              <1> sysopen: ;<open file>
  1540                              <1> 	; 26/10/2016
  1541                              <1> 	; 24/10/2016
  1542                              <1> 	; 17/10/2016
  1543                              <1> 	; 15/10/2016
  1544                              <1> 	; 06/10/2016, 07/10/2016, 08/10/2016
  1545                              <1> 	; 05/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1546                              <1> 	;	     -derived from INT_21H.ASM-
  1547                              <1> 	;            ("loc_INT21h_open_file")
  1548                              <1>         ; 	26/02/2011 
  1549                              <1>         ;	INT 21h Function AH = 3Dh
  1550                              <1>         ;	Open File
  1551                              <1>         ;	INPUT
  1552                              <1>         ;	   AL= File Access Value
  1553                              <1> 	;     	     0- Open for reading
  1554                              <1> 	;            1- Open for writing
  1555                              <1>         ;            2- Open for reading and writing
  1556                              <1>         ;          DS:DX= Pointer to filename (ASCIIZ)
  1557                              <1>         ;
  1558                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1559                              <1> 	; 22/05/2013 - 27/05/2013 (Retro UNIX 8086 v1)
  1560                              <1> 	;
  1561                              <1> 	; 'sysopen' opens a file in following manner:
  1562                              <1> 	;    1) The second argument in a sysopen says whether to
  1563                              <1> 	;	open the file ro read (0) or write (>0).
  1564                              <1> 	;    2) I-node of the particular file is obtained via 'namei'.
  1565                              <1> 	;    3) The file is opened by 'iopen'.
  1566                              <1> 	;    4) Next housekeeping is performed on the fsp table
  1567                              <1> 	;	and the user's open file list - u.fp.
  1568                              <1> 	;	a) u.fp and fsp are scanned for the next available slot.
  1569                              <1> 	;	b) An entry for the file is created in the fsp table.
  1570                              <1> 	;	c) The number of this entry is put on u.fp list.
  1571                              <1> 	;	d) The file descriptor index to u.fp list is pointed
  1572                              <1> 	;	   to by u.r0.
  1573                              <1> 	;
  1574                              <1> 	; Calling sequence:
  1575                              <1> 	;	sysopen; name; mode
  1576                              <1> 	; Arguments:
  1577                              <1> 	;	name - file name or path name
  1578                              <1> 	;	mode - 0 to open for reading
  1579                              <1> 	;	       1 to open for writing
  1580                              <1> 	; Inputs: (arguments)
  1581                              <1> 	; Outputs: *u.r0 - index to u.fp list (the file descriptor)
  1582                              <1> 	;		  is put into r0's location on the stack.	
  1583                              <1> 	; ...............................................................
  1584                              <1> 	;				
  1585                              <1> 	; Retro UNIX 8086 v1 modification: 
  1586                              <1> 	;       'sysopen' system call has two arguments; so,
  1587                              <1> 	;	* 1st argument, name is pointed to by BX register
  1588                              <1> 	;	* 2nd argument, mode is in CX register
  1589                              <1> 	;
  1590                              <1> 	;	AX register (will be restored via 'u.r0') will return
  1591                              <1> 	;	to the user with the file descriptor/number 
  1592                              <1> 	;	(index to u.fp list).
  1593                              <1> 	;
  1594                              <1> 	;call	arg2
  1595                              <1> 	; * name - 'u.namep' points to address of file/path name
  1596                              <1> 	;          in the user's program segment ('u.segmnt')
  1597                              <1> 	;          with offset in BX register (as sysopen argument 1).
  1598                              <1> 	; * mode - sysopen argument 2 is in CX register 
  1599                              <1> 	;          which is on top of stack.
  1600                              <1> 	;
  1601                              <1> 	; jsr r0,arg2 / get sys args into u.namep and on stack
  1602                              <1> 	;
  1603                              <1>        	; system call registers: ebx, ecx (through 'sysenter')
  1604                              <1> 	;
  1605                              <1> 	; TRDOS 386 (05/10/2016)
  1606                              <1> 	;	
  1607                              <1>         ; INPUT ->
  1608                              <1>         ;	   CL = File Access Value (Open Mode)
  1609                              <1> 	;     	      0 - Open file for reading
  1610                              <1> 	;             1 - Open file for writing
  1611                              <1>         ;             2 - Open device for reading
  1612                              <1> 	;	      3 - Open device for writing
  1613                              <1>         ;          EBX = Pointer to filename/devicename (ASCIIZ)
  1614                              <1> 	; OUTPUT ->
  1615                              <1> 	;          eax = File/Device Handle/Number (index) (AL)
  1616                              <1> 	;          cf = 1 -> Error code in AL
  1617                              <1> 	;
  1618                              <1> 	; Modified Registers: EAX (at the return of system call)
  1619                              <1> 	;  
  1620                              <1> 
  1621 0000CCA7 80F901              <1> 	cmp	cl, 1 ; read file (0), write file (1)
  1622 0000CCAA 7614                <1> 	jna	short sysopen_0
  1623                              <1> 
  1624 0000CCAC 80F903              <1> 	cmp	cl, 3
  1625 0000CCAF 0F8640010000        <1> 	jna	sysopen_device
  1626                              <1> 
  1627                              <1> 	; Invalid access code
  1628 0000CCB5 B817000000          <1> 	mov	eax, ERR_INV_PARAMETER
  1629 0000CCBA 0F874B010000        <1> 	ja	sysopen_dev_err
  1630                              <1> 
  1631                              <1> sysopen_0:
  1632                              <1> 	;mov	[u.namep], ebx
  1633 0000CCC0 51                  <1> 	push	ecx
  1634 0000CCC1 89DE                <1> 	mov	esi, ebx
  1635                              <1> 	; file name is forced, change directory as temporary
  1636                              <1> 	;mov	ax, 1
  1637                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
  1638                              <1> 	;call	set_working_path 
  1639 0000CCC3 E8B72F0000          <1> 	call	set_working_path_x ; 17/10/2016	
  1640 0000CCC8 731E                <1> 	jnc	short sysopen_1
  1641                              <1> 
  1642                              <1> syscreat_err: ; ecx = file attributes (for 'syscreat')
  1643 0000CCCA 59                  <1> 	pop	ecx ; open mode  
  1644 0000CCCB 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
  1645 0000CCCD 7505                <1> 	jnz	short sysopen_err
  1646                              <1> 	; eax = 0
  1647 0000CCCF B80C000000          <1> 	mov	eax, ERR_DIR_NOT_FOUND ; Directory not found !
  1648                              <1> sysopen_err:
  1649 0000CCD4 A3[64030300]        <1> 	mov	[u.r0], eax
  1650 0000CCD9 A3[C8030300]        <1> 	mov	[u.error], eax
  1651 0000CCDE E871300000          <1> 	call 	reset_working_path
  1652 0000CCE3 E95AFAFFFF          <1> 	jmp	error
  1653                              <1> 
  1654                              <1> sysopen_1:
  1655                              <1> 	;mov	esi, FindFile_Name
  1656 0000CCE8 66B80018            <1>         mov	ax, 1800h ; Only files 
  1657 0000CCEC E8F6B5FFFF          <1> 	call	find_first_file
  1658 0000CCF1 5A                  <1> 	pop	edx
  1659 0000CCF2 72E0                <1> 	jc	short sysopen_err ; eax = 2 (File not found !)
  1660                              <1> 
  1661                              <1> 	; check_open_file_attr_access_code
  1662                              <1> 
  1663 0000CCF4 F6C307              <1>         test	bl, 7  ; system, hidden, readonly 
  1664 0000CCF7 740B                <1>         jz	short sysopen_2
  1665                              <1> 
  1666 0000CCF9 20D2                <1> 	and	dl, dl ; 0 = read mode
  1667 0000CCFB 7407                <1> 	jz	short sysopen_2
  1668                              <1> 
  1669                              <1> 	; 1 = write, 2 = read & write, >2 = invalid
  1670 0000CCFD B80B000000          <1>         mov	eax, ERR_FILE_ACCESS  ; 11 = 'permission denied !'
  1671 0000CD02 EBD0                <1>         jmp	short sysopen_err
  1672                              <1> 
  1673                              <1> sysopen_2:
  1674                              <1> 	; esi = Directory Entry (FindFile_DirEntry) Location
  1675 0000CD04 89F3                <1> 	mov	ebx, esi
  1676 0000CD06 31F6                <1>         xor     esi, esi ; 0
  1677 0000CD08 31FF                <1>         xor     edi, edi ; 0
  1678                              <1> sysopen_3: ; scan the list of entries in fsp table
  1679 0000CD0A 80BE[6A030300]00    <1>         cmp     byte [esi+u.fp], 0
  1680 0000CD11 760F                <1>         jna     short sysopen_4 ; empty slot
  1681 0000CD13 6646                <1>         inc     si
  1682 0000CD15 6683FE0A            <1>         cmp     si, 10
  1683 0000CD19 72EF                <1> 	jb	short sysopen_3
  1684                              <1> toomanyf:
  1685 0000CD1B B80D000000          <1> 	mov	eax, ERR_TOO_MANY_FILES ; too many open files !
  1686 0000CD20 EBB2                <1> 	jmp	short sysopen_err
  1687                              <1> 
  1688                              <1> sysopen_4: 
  1689 0000CD22 80BF[E6680100]00    <1>         cmp     byte [edi+OF_MODE], 0 ; Scan open files table 
  1690 0000CD29 760A                <1> 	jna     short sysopen_5
  1691 0000CD2B 6647                <1> 	inc	di
  1692 0000CD2D 6683FF0A            <1> 	cmp     di, OPENFILES ; max. number of open files (=10)
  1693 0000CD31 72EF                <1> 	jb	short sysopen_4
  1694 0000CD33 EBE6                <1> 	jmp	short toomanyf
  1695                              <1> 
  1696                              <1> sysopen_5:
  1697 0000CD35 FEC2                <1> 	inc	dl
  1698 0000CD37 8897[E6680100]      <1>         mov     [edi+OF_MODE], dl
  1699 0000CD3D 8A15[26620100]      <1> 	mov	dl, [FindFile_Drv]
  1700 0000CD43 8897[DC680100]      <1>         mov     [edi+OF_DRIVE], dl ; Logical DOS drive number
  1701 0000CD49 66C1E702            <1> 	shl	di, 2 ; *4 (dword offset)
  1702                              <1> 
  1703 0000CD4D 8987[2C690100]      <1> 	mov	[edi+OF_SIZE], eax ; File size in bytes
  1704                              <1> 
  1705 0000CD53 668B4314            <1>         mov 	ax, [ebx+DirEntry_FstClusHI]
  1706 0000CD57 C1E010              <1> 	shl	eax, 16
  1707 0000CD5A 668B431A            <1> 	mov 	ax, [ebx+DirEntry_FstClusLO]
  1708 0000CD5E 8987[B4680100]      <1> 	mov     [edi+OF_FCLUSTER], eax ; First cluster
  1709 0000CD64 8987[CC690100]      <1> 	mov     [edi+OF_CCLUSTER], eax ; Current cluster
  1710                              <1> 
  1711 0000CD6A 31DB                <1>         xor	ebx, ebx
  1712 0000CD6C 899F[04690100]      <1>         mov     [edi+OF_POINTER], ebx ; offset pointer (0)
  1713 0000CD72 899F[F4690100]      <1>         mov     [edi+OF_CCINDEX], ebx ; cluster index (0)
  1714                              <1> 
  1715 0000CD78 A1[98620100]        <1> 	mov	eax, [FindFile_DirFirstCluster]
  1716 0000CD7D 8987[54690100]      <1> 	mov	[edi+OF_DIRFCLUSTER], eax
  1717                              <1> 
  1718 0000CD83 A1[9C620100]        <1> 	mov	eax, [FindFile_DirCluster]
  1719 0000CD88 8987[7C690100]      <1> 	mov	[edi+OF_DIRCLUSTER], eax
  1720                              <1> 
  1721                              <1> 	; Get (& Save) Volume ID 
  1722                              <1> 	; Important for files of removable drives
  1723                              <1> 	; (In order to check the drive has same volume/disk)
  1724 0000CD8E 88D7                <1> 	mov	bh, dl
  1725 0000CD90 81C300010900        <1>         add	ebx, Logical_DOSDisks
  1726 0000CD96 8A4303              <1>         mov	al, [ebx+LD_FATType]
  1727 0000CD99 3C01                <1>         cmp	al, 1
  1728 0000CD9B 7209                <1>         jb	short sysopen_6_fs
  1729 0000CD9D 3C02                <1>         cmp	al, 2
  1730 0000CD9F 770A                <1>         ja	short sysopen_6_fat32
  1731                              <1> sysopen_6_fat:
  1732 0000CDA1 8B432D              <1>         mov	eax, [ebx+LD_BPB+VolumeID]
  1733 0000CDA4 EB08                <1>         jmp	short sysopen_7
  1734                              <1> sysopen_6_fs:
  1735 0000CDA6 8B4328              <1>         mov	eax, [ebx+LD_FS_VolumeSerial]
  1736 0000CDA9 EB03                <1>         jmp	short sysopen_7
  1737                              <1> sysopen_6_fat32:
  1738 0000CDAB 8B4349              <1>         mov	eax, [ebx+LD_BPB+FAT32_VolID]
  1739                              <1> sysopen_7:
  1740 0000CDAE A3[7C590100]        <1>         mov	[Current_VolSerial], eax
  1741                              <1> 
  1742 0000CDB3 8987[A4690100]      <1> 	mov	[edi+OF_VOLUMEID], eax
  1743                              <1> 
  1744                              <1> 	; 24/10/2016
  1745 0000CDB9 66D1EF              <1> 	shr	di, 1 ; 4/2, word offset
  1746 0000CDBC 668B1D[A0620100]    <1> 	mov	bx, [FindFile_DirEntryNumber]
  1747 0000CDC3 66899F[1C6A0100]    <1> 	mov	[edi+OF_DIRENTRY], bx
  1748                              <1> 
  1749 0000CDCA 31D2                <1> 	xor	edx, edx
  1750                              <1> 	;shr	di, 2 ; /4 (byte offset)
  1751 0000CDCC 66D1EF              <1> 	shr	di, 1 ; 2/2, byte offset
  1752 0000CDCF 8897[FA680100]      <1> 	mov	byte [edi+OF_OPENCOUNT], dl ; 0
  1753 0000CDD5 8897[F0680100]      <1> 	mov	byte [edi+OF_STATUS], dl ; 0
  1754                              <1> 
  1755 0000CDDB 89FB                <1> 	mov	ebx, edi
  1756 0000CDDD FEC3                <1> 	inc	bl
  1757                              <1> 
  1758 0000CDDF 889E[6A030300]      <1>         mov     [esi+u.fp], bl ; Open File Entry Number
  1759 0000CDE5 8935[64030300]      <1> 	mov     [u.r0], esi ; move index to u.fp list 
  1760                              <1> 			    ; into eax on stack
  1761                              <1> 
  1762 0000CDEB E8642F0000          <1>         call 	reset_working_path
  1763                              <1>         
  1764 0000CDF0 E96DF9FFFF          <1> 	jmp	sysret
  1765                              <1> 
  1766                              <1> 	; (Retro UNIX 386 v1.0)
  1767                              <1> 	; 'fsp' table (10 bytes/entry)
  1768                              <1> 	; bit 15				   bit 0
  1769                              <1> 	; ---|-------------------------------------------
  1770                              <1> 	; r/w|		i-number of open file
  1771                              <1> 	; ---|-------------------------------------------
  1772                              <1> 	;		   device number
  1773                              <1> 	; -----------------------------------------------
  1774                              <1> 	; offset pointer, r/w pointer to file (bit 0-15)
  1775                              <1> 	; -----------------------------------------------
  1776                              <1> 	; offset pointer, r/w pointer to file (bit 16-31)
  1777                              <1> 	; ----------------------|------------------------
  1778                              <1> 	;  flag that says file 	| number of processes
  1779                              <1> 	;   has been deleted	| that have file open 
  1780                              <1> 	; ----------------------|------------------------
  1781                              <1> 
  1782                              <1> sysopen_device:
  1783                              <1> 	; 15/10/2016
  1784                              <1> 	; 08/10/2016
  1785                              <1> 	; 07/10/2016 (TRDOS 386 = TRDOS v2.0)
  1786 0000CDF5 51                  <1> 	push	ecx ; open mode
  1787 0000CDF6 89E5                <1> 	mov	ebp, esp
  1788 0000CDF8 B910000000          <1> 	mov	ecx, 16 ; transfer length = 16 bytes 
  1789 0000CDFD 29CC                <1> 	sub	esp, ecx
  1790 0000CDFF 89E7                <1> 	mov	edi, esp ; destination address 
  1791 0000CE01 89DE                <1> 	mov 	esi, ebx ; dev name in user's memory space
  1792 0000CE03 E83F1A0000          <1> 	call	transfer_from_user_buffer
  1793 0000CE08 7310                <1> 	jnc	short sysopen_dev_0
  1794                              <1> 	; eax = ERR_OUT_OF_MEMORY = 4 = ERR_MINOR_IM
  1795 0000CE0A 59                  <1> 	pop	ecx
  1796                              <1> sysopen_dev_err:
  1797 0000CE0B A3[64030300]        <1> 	mov	[u.r0], eax
  1798 0000CE10 A3[C8030300]        <1> 	mov	[u.error], eax
  1799 0000CE15 E928F9FFFF          <1> 	jmp	error
  1800                              <1> sysopen_dev_0:
  1801 0000CE1A 89FE                <1> 	mov	esi, edi ; Device name addr (max. 16 bytes, ASCIIZ) 
  1802                              <1> 			 ; for example: "tty, TTY, /dev/tty"
  1803 0000CE1C E8D9310000          <1> 	call	get_device_number
  1804 0000CE21 89EC                <1> 	mov	esp, ebp
  1805 0000CE23 59                  <1> 	pop	ecx
  1806 0000CE24 7307                <1> 	jnc	short sysopen_dev_1
  1807 0000CE26 B818000000          <1> 	mov	eax, ERR_INV_DEV_NAME ; 24 ; 'invalid device name !'
  1808 0000CE2B EBDE                <1> 	jmp	short sysopen_dev_err
  1809                              <1> sysopen_dev_1:
  1810                              <1> 	; eax = Device Number (AL)
  1811                              <1> 	;  cl = Open mode (2 = device read, 3 = device write)
  1812 0000CE2D 31DB                <1>         xor     ebx, ebx ; 0
  1813                              <1> sysopen_dev_2: ; scan the list of entries
  1814 0000CE2F 389B[6A030300]      <1>         cmp     [ebx+u.fp], bl ; 0
  1815 0000CE35 760E                <1>         jna     short sysopen_dev_3 ; empty slot
  1816 0000CE37 FEC3                <1>         inc     bl
  1817 0000CE39 80FB0A              <1>         cmp     bl, 10
  1818 0000CE3C 72F1                <1> 	jb	short sysopen_dev_2
  1819                              <1> 	;
  1820 0000CE3E B80D000000          <1> 	mov	eax, ERR_TOO_MANY_FILES ; too many open files !
  1821 0000CE43 EBC6                <1> 	jmp	short sysopen_dev_err
  1822                              <1> sysopen_dev_3:
  1823 0000CE45 891D[64030300]      <1> 	mov 	[u.r0], ebx ; File/Device index/handle/descriptor
  1824                              <1> 	; eax = device number (entry offset)
  1825 0000CE4B 8AA8[78660100]      <1> 	mov	ch, [eax+DEV_ACCESS] ; bit 0 = accessable by users
  1826                              <1> 				     ; bit 1 = read access perm
  1827                              <1> 				     ; bit 2 = write access perm
  1828                              <1> 				     ; bit 3 = IOCTL permit to users
  1829                              <1> 				     ; bit 4 = block device if set
  1830                              <1> 				     ; bit 5 = 16 bit or 1024 byte
  1831                              <1> 				     ; bit 6 = 32 bit or 2048 byte
  1832                              <1> 				     ; bit 7 = installable device drv
  1833 0000CE51 F6C501              <1> 	test 	ch, 1 ; accessable by normal users (except root)
  1834 0000CE54 7510                <1> 	jnz	short sysopen_dev_4 ; yes, permission has been given
  1835 0000CE56 803D[B0030300]00    <1> 	cmp	byte [u.uid], 0 ; root?
  1836 0000CE5D 7607                <1> 	jna	short sysopen_dev_4 ; superuser can open all devices
  1837                              <1> sysopen_dev_perm_err:
  1838 0000CE5F B80B000000          <1> 	mov	eax, ERR_DEV_ACCESS  ; 11 = 'permission denied !'
  1839 0000CE64 EBA5                <1> 	jmp	short sysopen_dev_err
  1840                              <1> sysopen_dev_4:
  1841 0000CE66 D0ED                <1> 	shr	ch, 1 ; result: 1 = read, 2 = write, 3 = r & w 
  1842 0000CE68 FEC9                <1> 	dec	cl  ; result: 1 = read, 2 = write
  1843 0000CE6A 84E9                <1> 	test	cl, ch
  1844 0000CE6C 74F1                <1> 	jz	short sysopen_dev_perm_err 
  1845                              <1> 
  1846 0000CE6E D0E5                <1> 	shl	ch, 1 ; bit 0 = 0
  1847                              <1> 	; eax = device number (entry offset)
  1848 0000CE70 E8A1320000          <1> 	call	device_open
  1849 0000CE75 72E8                <1> 	jc	short sysopen_dev_perm_err 
  1850                              <1> 
  1851                              <1> 	; eax = device number (entry offset)
  1852 0000CE77 0C80                <1> 	or	al, 80h ; set device bit (set bit 7 to 1)
  1853 0000CE79 8B1D[64030300]      <1> 	mov	ebx, [u.r0]
  1854 0000CE7F 8883[6A030300]      <1> 	mov	[ebx+u.fp], al	; bit 7 (=1) points to device	
  1855                              <1> 	
  1856 0000CE85 E9D8F8FFFF          <1> 	jmp	sysret
  1857                              <1> 
  1858                              <1> sysmkdir: ; < make directory >
  1859                              <1> 	; 15/10/2016
  1860                              <1> 	; 10/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1861                              <1> 	;	     -derived from INT_21H.ASM-
  1862                              <1> 	;            ("loc_INT21h_create_file")
  1863                              <1>         ; 	10/07/2011 (12/03/2011)
  1864                              <1>         ;	INT 21h Function AH = 3Ch
  1865                              <1>         ;	Create File
  1866                              <1>         ;	INPUT
  1867                              <1>         ;	   CX = Attributes
  1868                              <1>         ;          DS:DX= Address of zero terminaned path name
  1869                              <1>         ;
  1870                              <1>         ;
  1871                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1872                              <1> 	; 27/05/2013 - 02/08/2013 (Retro UNIX 8086 v1)
  1873                              <1> 	;
  1874                              <1> 	; 'sysmkdir' creates an empty directory whose name is
  1875                              <1> 	; pointed to by arg 1. The mode of the directory is arg 2.	
  1876                              <1> 	; The special entries '.' and '..' are not present.
  1877                              <1> 	; Errors are indicated if the directory already exists or		
  1878                              <1> 	; user is not the super user. 
  1879                              <1> 	;
  1880                              <1> 	; Calling sequence:
  1881                              <1> 	;	sysmkdir; name; mode
  1882                              <1> 	; Arguments:
  1883                              <1> 	;	name - points to the name of the directory
  1884                              <1> 	;	mode - mode of the directory
  1885                              <1> 	; Inputs: (arguments)
  1886                              <1> 	; Outputs: -
  1887                              <1> 	;    (sets 'directory' flag to 1; 
  1888                              <1> 	;    'set user id on execution' and 'executable' flags to 0)
  1889                              <1> 	; ...............................................................
  1890                              <1> 	;				
  1891                              <1> 	; Retro UNIX 8086 v1 modification: 
  1892                              <1> 	;       'sysmkdir' system call has two arguments; so,
  1893                              <1> 	;	* 1st argument, name is pointed to by BX register
  1894                              <1> 	;	* 2nd argument, mode is in CX register
  1895                              <1> 	;
  1896                              <1> 	; TRDOS 386 (10/10/2016)
  1897                              <1> 	;	
  1898                              <1>         ; INPUT ->
  1899                              <1>         ;	   CL = Directory Attributes
  1900                              <1> 	;     	      bit 0 (1) - Read only file/dir (R)
  1901                              <1> 	;             bit 1 (1) - Hidden file/dir (H)
  1902                              <1>         ;             bit 2 (1) - System file/dir (R)
  1903                              <1> 	;             bit 3 (1) - Volume label/name (V)
  1904                              <1>         ;             bit 4 (1) - Subdirectory (D)
  1905                              <1> 	;	      bit 5 (1) - File/Dir has been archived (A)
  1906                              <1> 	;	   CX = 0 -> create normal directory	 	
  1907                              <1>         ;          EBX = Pointer to directory name (ASCIIZ) -path-
  1908                              <1> 	;	
  1909                              <1> 	; OUTPUT ->
  1910                              <1> 	;          eax = First cluster of the new directory
  1911                              <1> 	;          cf = 1 -> Error code in AL
  1912                              <1> 	;
  1913                              <1> 	; Modified Registers: EAX (at the return of system call)
  1914                              <1> 	;  
  1915                              <1> 	; Note: If the file or directory is existing
  1916                              <1> 	;	an access error will be returned. 
  1917                              <1> 
  1918 0000CE8A 6621C9              <1> 	and	cx, cx ; if cx = 0 -> create a normal subdir
  1919 0000CE8D 7413                <1> 	jz	short sysmkdir_1
  1920                              <1> 
  1921 0000CE8F F6C110              <1> 	test	cl, 10h ; if dir flags set, also use other flags
  1922 0000CE92 0F853EFDFFFF        <1> 	jnz	sysmkdir_0 ; jump to head of 'syscreat'
  1923                              <1> 
  1924                              <1> 	; CX has wrong flags
  1925 0000CE98 B817000000          <1> 	mov 	eax, ERR_INV_FLAGS
  1926 0000CE9D E969FFFFFF          <1> 	jmp	sysopen_dev_err
  1927                              <1> 
  1928                              <1> sysmkdir_1:
  1929 0000CEA2 B110                <1> 	mov	cl, 10h ; set subdir flag and reset other flags
  1930 0000CEA4 E92DFDFFFF          <1> 	jmp	sysmkdir_0 ; jump to head of 'syscreat'
  1931                              <1> sysmkdir_2: 
  1932                              <1> 	; jump from 'syscreat' ; from 'syscreat_1'
  1933                              <1> 	;  CL = Directory attributes/flags  
  1934 0000CEA9 BE[68620100]        <1> 	mov	esi, FindFile_Name 
  1935 0000CEAE E804D7FFFF          <1> 	call	make_sub_directory
  1936 0000CEB3 0F821BFEFFFF        <1> 	jc	sysopen_err       ; NOTE: Old type (TRDOS 8086)
  1937                              <1> 				  ; error codes must be modified
  1938                              <1> 				  ; for next TRDOS 386 versions
  1939                              <1> 				  ; (10/10/2016)
  1940                              <1> 				  ; Old (MSDOS type)
  1941                              <1> 				  ; error codes (2011):
  1942                              <1> 				  ;  2 = file not found
  1943                              <1> 				  ;  3 = directory not found
  1944                              <1> 				  ;  5 = access denied
  1945                              <1> 				  ; 12 = no more files
  1946                              <1> 			          ; 19 = disk write protected   
  1947                              <1> 				  ; 39 = insufficient disk space
  1948                              <1> 				  ; 'sysdefs.s' ; 10/10/2016  	
  1949                              <1> 	
  1950 0000CEB9 A3[64030300]        <1> 	mov	[u.r0], eax ; New sub dir's first cluster
  1951                              <1> 
  1952 0000CEBE E8912E0000          <1>         call 	reset_working_path
  1953                              <1> 
  1954 0000CEC3 E99AF8FFFF          <1> 	jmp	sysret	
  1955                              <1> 
  1956                              <1> sysclose: ;<close file>
  1957                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0) 
  1958                              <1> 	;
  1959                              <1> 	; 14/05/2015 (Retro UNIX 386 v1 - Beginning)
  1960                              <1> 	; 22/05/2013 - 26/05/2013 (Retro UNIX 8086 v1)
  1961                              <1> 	;
  1962                              <1> 	; 'sysclose', given a file descriptor in 'u.r0', closes the
  1963                              <1> 	; associated file. The file descriptor (index to 'u.fp' list)
  1964                              <1> 	; is put in r1 and 'fclose' is called.
  1965                              <1> 	;
  1966                              <1> 	; Calling sequence:
  1967                              <1> 	;	sysclose
  1968                              <1> 	; Arguments:
  1969                              <1> 	;	-  
  1970                              <1> 	; Inputs: *u.r0 - file descriptor
  1971                              <1> 	; Outputs: -
  1972                              <1> 	; ...............................................................
  1973                              <1> 	;				
  1974                              <1> 	; Retro UNIX 8086 v1 modification:
  1975                              <1> 	;	 The user/application program puts file descriptor
  1976                              <1> 	;        in BX register as 'sysclose' system call argument.
  1977                              <1> 	; 	 (argument transfer method 1)
  1978                              <1> 
  1979                              <1> 	; TRDOS 386 (06/10/2016)
  1980                              <1> 	;	
  1981                              <1>         ; INPUT ->
  1982                              <1>         ;	   EBX = File Handle/Number (file index) (AL)
  1983                              <1> 	; OUTPUT ->
  1984                              <1> 	;          cf = 0 -> EAX = 0
  1985                              <1> 	;          cf = 1 -> Error code in EAX (ERR_FILE_NOT_OPEN)
  1986                              <1> 	;
  1987                              <1> 	; Modified Registers: EAX (at the return of system call)
  1988                              <1> 	;  
  1989                              <1> 
  1990 0000CEC8 89D8                <1> 	mov 	eax, ebx
  1991 0000CECA 31DB                <1> 	xor	ebx, ebx	
  1992 0000CECC 891D[64030300]      <1> 	mov	[u.r0], ebx ; 0  ; return value of EAX
  1993 0000CED2 E8450E0000          <1> 	call 	fclose
  1994 0000CED7 0F8385F8FFFF        <1> 	jnc	sysret
  1995 0000CEDD B80A000000          <1> 	mov	eax, ERR_FILE_NOT_OPEN ; file not open !
  1996 0000CEE2 A3[C8030300]        <1> 	mov	[u.error], eax ;
  1997 0000CEE7 A3[64030300]        <1> 	mov	[u.r0], eax ; ! invalid handle !
  1998 0000CEEC E951F8FFFF          <1> 	jmp	error
  1999                              <1> 
  2000                              <1> sysread: ; < read from file >
  2001                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0) 
  2002                              <1> 	;	     -derived from INT_21H.ASM-
  2003                              <1> 	;            ("loc_INT21h_read_file")
  2004                              <1>         ; 	13/03/2011 (05/03/2011)
  2005                              <1>         ;	INT 21h Function AH = 3Fh
  2006                              <1>         ;	Read from a File
  2007                              <1>         ;	INPUT
  2008                              <1> 	;	   BX = File Handle
  2009                              <1>         ;	   CX = Number of bytes to read
  2010                              <1>         ;          DS:DX= Buffer address
  2011                              <1>         ;
  2012                              <1> 	; Note: TRDOS 386 'sysread' has been derived from 
  2013                              <1> 	;	Retro UNIX 386 v1 'sysread', except a few 
  2014                              <1> 	;	code modifications.
  2015                              <1> 	;
  2016                              <1> 	; 13/05/2015 (Retro UNIX 386 v1)
  2017                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  2018                              <1> 	; 23/05/2013 (Retro UNIX 8086 v1)
  2019                              <1> 	;
  2020                              <1> 	; 'sysread' is given a buffer to read into and the number of
  2021                              <1> 	; characters to be read. If finds the file from the file
  2022                              <1> 	; descriptor located in *u.r0 (r0). This file descriptor
  2023                              <1> 	; is returned from a successful open call (sysopen).
  2024                              <1> 	; The i-number of file is obtained via 'rw1' and the data
  2025                              <1> 	; is read into core via 'readi'.
  2026                              <1> 	;
  2027                              <1> 	; Calling sequence:
  2028                              <1> 	;	sysread; buffer; nchars
  2029                              <1> 	; Arguments:
  2030                              <1> 	;	buffer - location of contiguous bytes where 
  2031                              <1> 	;		 input will be placed.
  2032                              <1> 	;	nchars - number of bytes or characters to be read.
  2033                              <1> 	; Inputs: *u.r0 - file descriptor (& arguments)
  2034                              <1> 	; Outputs: *u.r0 - number of bytes read.	
  2035                              <1> 	; ...............................................................
  2036                              <1> 	;				
  2037                              <1> 	; Retro UNIX 8086 v1 modification: 
  2038                              <1> 	;       'sysread' system call has three arguments; so,
  2039                              <1> 	;	* 1st argument, file descriptor is in BX register
  2040                              <1> 	;	* 2nd argument, buffer address/offset in CX register
  2041                              <1> 	;	* 3rd argument, number of bytes is in DX register
  2042                              <1> 	;
  2043                              <1> 	;	AX register (will be restored via 'u.r0') will return
  2044                              <1> 	;	to the user with number of bytes read. 
  2045                              <1> 	;
  2046                              <1> 	; TRDOS 386 (05/10/2016)
  2047                              <1> 	;	
  2048                              <1>         ; INPUT ->
  2049                              <1>         ;	   EBX = File handle (descriptor/index)
  2050                              <1> 	;	   ECX = Buffer address		
  2051                              <1>         ;          EDX = Number of bytes
  2052                              <1> 	; OUTPUT ->
  2053                              <1> 	;          EAX = Number of bytes have been read
  2054                              <1> 	;          cf = 1 -> Error code in AL
  2055                              <1> 	;
  2056                              <1> 	; Modified Registers: EAX (at the return of system call)
  2057                              <1> 	; 
  2058                              <1> 
  2059                              <1> 	; EBX = File descriptor
  2060 0000CEF1 E8740E0000          <1> 	call	getf1 
  2061 0000CEF6 7277                <1> 	jc	short device_read ; read data from device
  2062                              <1> 	; EAX = First cluster of the file
  2063                              <1> 
  2064 0000CEF8 E83F000000          <1> 	call	rw1
  2065 0000CEFD 730A                <1> 	jnc	short sysread_0
  2066                              <1> 
  2067 0000CEFF A3[64030300]        <1> 	mov	[u.r0], eax ; error code
  2068 0000CF04 E939F8FFFF          <1> 	jmp	error
  2069                              <1> 	 
  2070                              <1> sysread_0:
  2071 0000CF09 E825140000          <1> 	call	readi
  2072 0000CF0E EB1D                <1> 	jmp	short rw0
  2073                              <1> 
  2074                              <1> syswrite: ; < write to file >
  2075                              <1> 	; 23/10/2016
  2076                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0) 
  2077                              <1> 	;	     -derived from INT_21H.ASM-
  2078                              <1> 	;            ("loc_INT21h_write_file")
  2079                              <1>         ; 	13/03/2011 (05/03/2011)
  2080                              <1>         ;	INT 21h Function AH = 40h
  2081                              <1>         ;	Write to a File
  2082                              <1>         ;	INPUT
  2083                              <1> 	;	   BX = File Handle
  2084                              <1>         ;	   CX = Number of bytes to write
  2085                              <1>         ;          DS:DX= Buffer address
  2086                              <1>         ;
  2087                              <1> 	; Note: TRDOS 386 'sysrwrite' has been derived from 
  2088                              <1> 	;	Retro UNIX 386 v1 'syswrite', except a few 
  2089                              <1> 	;	code modifications.
  2090                              <1> 	;
  2091                              <1> 
  2092                              <1> 	; 13/05/2015 (Retro UNIX 386 v1)
  2093                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  2094                              <1> 	; 23/05/2013 (Retro UNIX 8086 v1)
  2095                              <1> 	;
  2096                              <1> 	; 'syswrite' is given a buffer to write onto an output file
  2097                              <1> 	; and the number of characters to write. If finds the file
  2098                              <1> 	; from the file descriptor located in *u.r0 (r0). This file 
  2099                              <1> 	; descriptor is returned from a successful open or create call
  2100                              <1> 	; (sysopen or syscreat). The i-number of file is obtained via
  2101                              <1> 	; 'rw1' and buffer is written on the output file via 'write'.
  2102                              <1> 	;
  2103                              <1> 	; Calling sequence:
  2104                              <1> 	;	syswrite; buffer; nchars
  2105                              <1> 	; Arguments:
  2106                              <1> 	;	buffer - location of contiguous bytes to be writtten.
  2107                              <1> 	;	nchars - number of characters to be written.
  2108                              <1> 	; Inputs: *u.r0 - file descriptor (& arguments)
  2109                              <1> 	; Outputs: *u.r0 - number of bytes written.	
  2110                              <1> 	; ...............................................................
  2111                              <1> 	;				
  2112                              <1> 	; Retro UNIX 8086 v1 modification: 
  2113                              <1> 	;       'syswrite' system call has three arguments; so,
  2114                              <1> 	;	* 1st argument, file descriptor is in BX register
  2115                              <1> 	;	* 2nd argument, buffer address/offset in CX register
  2116                              <1> 	;	* 3rd argument, number of bytes is in DX register
  2117                              <1> 	;
  2118                              <1> 	;	AX register (will be restored via 'u.r0') will return
  2119                              <1> 	;	to the user with number of bytes written. 
  2120                              <1> 	;
  2121                              <1> 	; INPUT ->
  2122                              <1>         ;	   EBX = File handle (descriptor/index)
  2123                              <1> 	;	   ECX = Buffer address		
  2124                              <1>         ;          EDX = Number of bytes
  2125                              <1> 	; OUTPUT ->
  2126                              <1> 	;          EAX = Number of bytes have been written
  2127                              <1> 	;          cf = 1 -> Error code in AL
  2128                              <1> 	;
  2129                              <1> 	; Modified Registers: EAX (at the return of system call)
  2130                              <1> 	;  
  2131                              <1> 
  2132                              <1> 	; EBX = File descriptor
  2133 0000CF10 E8550E0000          <1> 	call	getf1 
  2134 0000CF15 7274                <1> 	jc	short device_write ; write data to device
  2135                              <1> 	; EAX = First cluster of the file
  2136                              <1> 	; EBX = File number  (Open file number) ; 23/10/2016
  2137                              <1> 
  2138 0000CF17 E820000000          <1> 	call	rw1
  2139 0000CF1C 730A                <1> 	jnc	short syswrite_0
  2140 0000CF1E A3[64030300]        <1> 	mov	[u.r0], eax ; error code
  2141 0000CF23 E91AF8FFFF          <1> 	jmp	error
  2142                              <1> 	 
  2143                              <1> syswrite_0:
  2144 0000CF28 E8321B0000          <1> 	call	writei
  2145                              <1> rw0: ; 1:
  2146 0000CF2D A1[8C030300]        <1>         mov	eax, [u.nread]
  2147 0000CF32 A3[64030300]        <1> 	mov	[u.r0], eax
  2148 0000CF37 E926F8FFFF          <1> 	jmp	sysret
  2149                              <1> 
  2150                              <1> rw1:	
  2151                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0) 
  2152                              <1> 	; 14/05/2015 (Retro UNIX 386 v1)
  2153                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  2154                              <1> 	; 23/05/2013 - 24/05/2013 (Retro UNIX 8086 v1)
  2155                              <1> 	; System call registers: ebx, ecx, edx (through 'sysenter')
  2156                              <1> 	;
  2157                              <1> 	; EBX = File descriptor
  2158                              <1> 	;call	getf1 ; calling point in 'getf' from 'rw1'
  2159                              <1> 	;jc	short device_rw ; read/write data from/to device
  2160                              <1> 	; EAX = First cluster of the file
  2161                              <1> 
  2162 0000CF3C 83F802              <1> 	cmp 	eax, 2
  2163 0000CF3F 7217                <1> 	jb	short rw2
  2164                              <1> 	;
  2165 0000CF41 890D[84030300]      <1> 	mov	[u.base], ecx 	; buffer address/offset 
  2166                              <1> 				;(in the user's virtual memory space)
  2167 0000CF47 8915[88030300]      <1> 	mov	[u.count], edx 
  2168                              <1> 
  2169 0000CF4D C705[C8030300]0000- <1>         mov     dword [u.error], 0 ; reset the last error code
  2169 0000CF55 0000                <1>
  2170 0000CF57 C3                  <1> 	retn
  2171                              <1> 
  2172                              <1> rw2:
  2173 0000CF58 B80A000000          <1> 	mov	eax, ERR_FILE_NOT_OPEN ; file not open !
  2174 0000CF5D A3[C8030300]        <1> 	mov	dword [u.error], eax
  2175 0000CF62 C3                  <1> 	retn
  2176                              <1> rw3: 
  2177 0000CF63 B80B000000          <1> 	mov	eax, ERR_FILE_ACCESS ; permission denied !
  2178 0000CF68 A3[C8030300]        <1> 	mov	dword [u.error], eax
  2179 0000CF6D F9                  <1> 	stc
  2180 0000CF6E C3                  <1> 	retn
  2181                              <1> 
  2182                              <1> device_read:
  2183                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0)
  2184                              <1> 	; cl = DEV_OPENMODE ; open mode
  2185                              <1> 	; ch = DEV_ACCESS   ; access flags   
  2186                              <1> 	; al = DEV_DRIVER   ; device number (eax)
  2187                              <1> 
  2188 0000CF6F F6C101              <1> 	test	cl, 1 ; 1 = read, 2 = write, 3 = read&write
  2189 0000CF72 74EF                <1> 	jz	short rw3
  2190                              <1> 
  2191 0000CF74 89C3                <1> 	mov	ebx, eax
  2192 0000CF76 66C1E302            <1> 	shl	bx, 2 ; *4
  2193                              <1> 
  2194 0000CF7A F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  2195 0000CF7D 7406                <1> 	jz	short d_read_2 ; Kernel device
  2196                              <1> 	; installable device
  2197                              <1> d_read_1:
  2198 0000CF7F FFA3[34660100]      <1>         jmp	dword [ebx+IDEV_RADDR-4]
  2199                              <1> d_read_2:
  2200 0000CF85 FFA3[DE150100]      <1> 	jmp	dword [ebx+KDEV_RADDR-4]
  2201                              <1> 
  2202                              <1> device_write:
  2203                              <1> 	; 11/10/2016 (TRDOS 386 = TRDOS v2.0)
  2204                              <1> 	; cl = DEV_OPENMODE ; open mode
  2205                              <1> 	; ch = DEV_ACCESS   ; access flags   
  2206                              <1> 	; al = DEV_DRIVER   ; device number (eax)
  2207                              <1> 
  2208 0000CF8B F6C102              <1> 	test	cl, 2 ; 1 = read, 2 = write, 3 = read&write
  2209 0000CF8E 74D3                <1> 	jz	short rw3	
  2210                              <1> 
  2211 0000CF90 89C3                <1> 	mov	ebx, eax
  2212 0000CF92 66C1E302            <1> 	shl	bx, 2 ; *4
  2213                              <1> 
  2214 0000CF96 F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  2215 0000CF99 7406                <1> 	jz	short d_write_2 ; Kernel device
  2216                              <1> 	; installable device
  2217                              <1> d_write_1:
  2218 0000CF9B FFA3[54660100]      <1>         jmp	dword [ebx+IDEV_WADDR-4]
  2219                              <1> d_write_2:
  2220 0000CFA1 FFA3[2E160100]      <1> 	jmp	dword [ebx+KDEV_WADDR-4]
  2221                              <1> 
  2222                              <1> 
  2223                              <1> sysemt: ; enable (or disable) multi tasking -time sharing-
  2224                              <1> 	;
  2225                              <1> 	; 23/05/2016 - TRDOS 386 (TRDOS v2.0)
  2226                              <1> 	; 14/05/2015 (Retro UNIX 386 v1)
  2227                              <1> 	; 10/12/2013 - 20/04/2014 (Retro UNIX 8086 v1)
  2228                              <1> 	;
  2229                              <1> 	; Retro UNIX 8086 v1 modification: 
  2230                              <1> 	;	'Enable Multi Tasking'  system call instead 
  2231                              <1> 	;	of 'Emulator Trap' in original UNIX v1 for PDP-11.
  2232                              <1> 	;
  2233                              <1> 	; Retro UNIX 8086 v1 feature only!
  2234                              <1> 	;	Using purpose: Kernel will start without time-out
  2235                              <1> 	;	(internal clock/timer) functionality.
  2236                              <1> 	;	Then etc/init will enable clock/timer for
  2237                              <1> 	;	multi tasking. 
  2238                              <1> 	;
  2239                              <1> 	; INPUT ->
  2240                              <1> 	;	BL = 0 -> disable multi tasking
  2241                              <1> 	;	BL > 1 -> enable multi tasking (time sharing) 
  2242                              <1> 	; OUTPUT ->
  2243                              <1> 	;	none	
  2244                              <1> 	;
  2245                              <1> 	;  Note: Multi tasking is disabled during system
  2246                              <1> 	;	 initialization, it must be enabled by using
  2247                              <1> 	;	 this system call. (Otherwise, running proces 
  2248                              <1> 	;	 will not be changed by another process within
  2249                              <1> 	;	 run time sequence/schedule, if running process
  2250                              <1> 	;	 will not 'release' itself. Only 'wakeup' procedure
  2251                              <1> 	;	 for waiting processes and programmed timer events
  2252                              <1> 	;	 for other processes can change running process 
  2253                              <1> 	;	 while multi tasking is disabled.) ** 23/05/2016 **
  2254                              <1> 
  2255 0000CFA7 803D[B0030300]00    <1> 	cmp	byte [u.uid], 0 ; root ?
  2256                              <1> 	;ja	error
  2257 0000CFAE 0F87D3F8FFFF        <1> 	ja	badsys ; 14/05/2015
  2258                              <1> 	;
  2259 0000CFB4 FA                  <1> 	cli
  2260 0000CFB5 881D[52650100]      <1> 	mov	[multi_tasking], bl ; 0 to disable, >0 to enable
  2261 0000CFBB E9A2F7FFFF          <1> 	jmp	sysret
  2262                              <1> 
  2263                              <1> systimer:
  2264                              <1> 	; 02/01/2017
  2265                              <1> 	; 21/12/2016
  2266                              <1> 	; 19/12/2016
  2267                              <1> 	; 10/12/2016 (callback)
  2268                              <1> 	; 10/06/2016
  2269                              <1> 	; 07/06/2016
  2270                              <1> 	; 06/06/2016
  2271                              <1> 	; 21/05/2016
  2272                              <1> 	; 19/05/2016
  2273                              <1> 	; 18/05/2016 - TRDOS 386 (TRDOS v2.0)
  2274                              <1> 	; (TRDOS 386 feature only!)
  2275                              <1> 	;
  2276                              <1> 	; (start or stop timer event(s))	
  2277                              <1> 	;
  2278                              <1> 	; INPUT ->
  2279                              <1> 	;	BL = Signal return byte (response byte)
  2280                              <1> 	;	     (Any requested value between 0 and 255)
  2281                              <1> 	;	     (Kernel will put it at the requested address)    	
  2282                              <1> 	;	BH = Time count unit
  2283                              <1> 	;	     0 = Stop timer event
  2284                              <1> 	;	     1 = 18.2 ticks per second
  2285                              <1> 	;	     2 = 10 milliseconds  		
  2286                              <1> 	;	     3 = 1 second (for real time clock interrupt) 	 
  2287                              <1> 	;	     4 = time/tick count in current time count unit
  2288                              <1> 	;	    // 10/12/2016			
  2289                              <1> 	;	    80h = Stop timer event (callback method)
  2290                              <1> 	;	    81h = 18.2 ticks per second, callback method
  2291                              <1> 	;	    82h = 10 milliseconds, callback method 	
  2292                              <1> 	;	    83h = 1 second (for RTC int), callback method 	
  2293                              <1> 	;	    84h = current time count unit, callback method
  2294                              <1> 	;
  2295                              <1> 	;	    Note: Only 03h or 83h will set real time clock
  2296                              <1> 	;		  (RTC) events (Others are for PIT events)! 	
  2297                              <1> 	;	
  2298                              <1> 	;	NOTE: If callback (user service) method is used,
  2299                              <1> 	;	    EDX will point to the return address (of service
  2300                              <1> 	;	    procedure) in user's space instead of signal 
  2301                              <1> 	;	    response byte address. (TRDOS 386 kernel will
  2302                              <1> 	;	    direct the cpu to that address -in user's space-
  2303                              <1> 	;	    at the return of system call or interrupt 
  2304                              <1> 	;	    just after the adjusted count/time is elapsed.)
  2305                              <1> 	;	    User's sevice routine must be ended with a
  2306                              <1> 	;	    'iret'. Normal return addresses from system 
  2307                              <1> 	;	    calls or and interrupts will be kept same except
  2308                              <1> 	;	    the timer returns. 			
  2309                              <1>      	;
  2310                              <1> 	;	BH = 0 -> Stop timer event
  2311                              <1> 	;	BL = Timer event number (1 to 255) if BH = 0     	
  2312                              <1> 	;	     If BL = 0, all timer events (which are belongs
  2313                              <1> 	;	      to running process) will be stopped 		    
  2314                              <1> 	;	ECX = Time/Tick count (depending on time count unit)
  2315                              <1> 	;	EDX = Signal return (Response) byte address
  2316                              <1> 	;	      (virtual address in user's memory space)
  2317                              <1> 	; OUTPUT ->
  2318                              <1> 	;	AL = Timer event number	(1 to 255) (max. value = 16)
  2319                              <1> 	;	IF BH Input = 0 & CF = 0 & AL = 0 -> 
  2320                              <1> 	;	     timer event(s) has/have been stopped/finished
  2321                              <1> 	;	CF = 1 & AL = 0 -> no timer setting space to set
  2322                              <1> 	;	CF = 1 & AL > 0 -> timer count unit is not usable
  2323                              <1> 	;
  2324                              <1> 	;	NOTE: To modify a time count for a user function,
  2325                              <1> 	;	      at first, current timer event must be stopped
  2326                              <1> 	;	      then a new timer event (which is related with
  2327                              <1> 	;	      same user function) must be started.
  2328                              <1> 	;		
  2329                              <1> 	;	      Signal return (response) byte may be used for 
  2330                              <1> 	;	      several purposes. Kernel will put this value 
  2331                              <1> 	;	      to requested address during timer interrupt,
  2332                              <1> 	;	      program/user can check this value to understand
  2333                              <1> 	;	      which event has been occurred and what is changed.
  2334                              <1> 	;	      (Multi timer events can share same signal address)
  2335                              <1> 	;	
  2336                              <1> 	;	NOTE: If the process is running while the time count
  2337                              <1> 	;	      is reached, kernel will put signal return (response)
  2338                              <1> 	;	      byte value at requested address during timer
  2339                              <1> 	;	      interrupt and the process will continue to run.
  2340                              <1> 	;	      Program/process must call (jump to) it's timer event
  2341                              <1> 	;	      function as required, for checking the timer event
  2342                              <1> 	;	      status via signal return (response) byte address. 
  2343                              <1> 	;
  2344                              <1> 	;	      If the process is not running (waiting or sleeping
  2345                              <1> 	;	      or released) while the time count is reached,
  2346                              <1> 	;	      it is restarted from where it left, to ensure
  2347                              <1> 	;	      proper multi media (video, audio, clock, timer)
  2348                              <1> 	;	      functionality.
  2349                              <1> 	;
  2350                              <1> 	;	      (It is better to use 'syswait' or 'syssleep',
  2351                              <1> 	;	      or 'sysrele' system call just after the timer
  2352                              <1> 	;	      function. Otherwise, timer events may block other
  2353                              <1> 	;	      processes which are not using timer events.)  	 		 			 		 	
  2354                              <1> 	;	     	      		 			
  2355                              <1> 	; Timer Event Structure: (max. 16 timer events, 16*16 bytes)
  2356                              <1> 	;       Owner:	        resb 1 ; 0 = free
  2357                              <1> 	;		  	       ;>0 = process number (u.uno)
  2358                              <1> 	;	Calback:	resb 1 ; 1 = callback, 0 = response byte
  2359                              <1> 	;	Interrupt:      resb 1 ; 0 = Timer interrupt (or none)
  2360                              <1> 	;		   	       ; 1 = Real Time Clock interrupt 
  2361                              <1> 	;	Response:       resb 1 ; 0 to 255, signal return value
  2362                              <1> 	;	Count Limit:	resd 1 ; count of ticks (total/set)
  2363                              <1> 	;	Current Count: 	resd 1 ; count of ticks (current)
  2364                              <1> 	;	Response Addr:  resd 1 ; response byte (pointer) address
  2365                              <1> 	;
  2366                              <1> 
  2367                              <1> 	; 19/12/2016 (timer callback)
  2368 0000CFC0 C605[906A0100]00    <1> 	mov	byte [tcallback], 0 
  2369 0000CFC7 C605[916A0100]00    <1> 	mov	byte [trtc], 0
  2370 0000CFCE C705[D0030300]0000- <1> 	mov	dword [u.tcb], 0 ; this is not necessary...
  2370 0000CFD6 0000                <1>
  2371                              <1> 
  2372 0000CFD8 80FF80              <1> 	cmp	bh, 80h
  2373 0000CFDB 7225                <1> 	jb	short systimer_cb2
  2374 0000CFDD 7704                <1> 	ja	short systimer_cb0
  2375                              <1> 
  2376 0000CFDF 31D2                <1> 	xor	edx, edx ; 0, reset callback address
  2377 0000CFE1 EB0B                <1> 	jmp	short systimer_cb1
  2378                              <1> 
  2379                              <1> systimer_cb0:
  2380 0000CFE3 80FF84              <1> 	cmp	bh, 84h	
  2381 0000CFE6 7764                <1> 	ja	short systimer_5 ;  undefined, error
  2382                              <1> 
  2383                              <1> 	;mov	byte [tcallback], 1 ; 19/12/2016
  2384 0000CFE8 FE05[906A0100]      <1> 	inc	byte [tcallback]
  2385                              <1> 
  2386                              <1> systimer_cb1:
  2387 0000CFEE 0FB635[B3030300]    <1> 	movzx	esi, byte [u.uno] ; process number
  2388 0000CFF5 66C1E602            <1> 	shl	si, 2	
  2389 0000CFF9 8996[0C010300]      <1> 	mov	[esi+p.tcb-4], edx ; set process timer callback address
  2390                              <1> 				   ; (overwrite prev value if it is set!)
  2391 0000CFFF 80E77F              <1> 	and	bh, 7Fh
  2392                              <1> 
  2393                              <1> systimer_cb2:
  2394 0000D002 80FF02              <1> 	cmp	bh, 2
  2395 0000D005 7445                <1>         je      short systimer_5  ; only 18.2 ticks per second is usable
  2396                              <1> 				  ; 10 milliseconds (100 Hertz) timer 
  2397                              <1> 				  ; will be set later (18/05/2016)
  2398 0000D007 774B                <1>         ja      short systimer_6 
  2399                              <1> 
  2400 0000D009 20FF                <1> 	and	bh, bh
  2401 0000D00B 0F84BA000000        <1>         jz      systimer_9        ; stop timer event(s)
  2402                              <1> 
  2403                              <1> 	; bh = 1 (timer interrupt, 18.2 Hz, IBM PC/AT ROMBIOS default)
  2404                              <1> 
  2405                              <1> systimer_19:
  2406 0000D011 B00A                <1> 	mov	al, 10 ; (*)
  2407                              <1> 
  2408                              <1> systimer_0:
  2409 0000D013 B710                <1> 	mov	bh, 16
  2410                              <1> 	;
  2411 0000D015 383D[53650100]      <1> 	cmp	[timer_events], bh ; 16 ; 07/06/2016
  2412 0000D01B 7319                <1> 	jnb 	short systimer_3  ; max. 16 timer events
  2413                              <1> 	;
  2414 0000D01D 50                  <1> 	push	eax ; (*)
  2415                              <1> 
  2416 0000D01E BF[60040300]        <1> 	mov	edi, timer_set  ; beginning address of timer events
  2417                              <1> 				; setting space
  2418 0000D023 30C0                <1> 	xor	al, al ; 0
  2419                              <1> systimer_1:
  2420 0000D025 FEC0                <1> 	inc	al
  2421 0000D027 803F00              <1> 	cmp	byte [edi], 0 	; is it free space ?
  2422 0000D02A 7639                <1> 	jna	short systimer_7 ; yes
  2423 0000D02C FECF                <1> 	dec	bh
  2424 0000D02E 7405                <1> 	jz	short systimer_2
  2425 0000D030 83C710              <1> 	add	edi, 16
  2426 0000D033 EBF0                <1> 	jmp	short  systimer_1 ; next event space
  2427                              <1> 
  2428                              <1> systimer_2:
  2429 0000D035 58                  <1> 	pop	eax ; (*) discard
  2430                              <1> systimer_3:
  2431 0000D036 C605[64030300]00    <1> 	mov	byte [u.r0], 0
  2432                              <1> systimer_4:
  2433 0000D03D C705[C8030300]1B00- <1>         mov     dword [u.error], ERR_MISC
  2433 0000D045 0000                <1>
  2434                              <1>                                 ; one of miscellaneous/other errors
  2435 0000D047 E9F6F6FFFF          <1> 	jmp	error ; cf -> 1
  2436                              <1> 
  2437                              <1> systimer_5:
  2438 0000D04C 883D[64030300]      <1> 	mov	[u.r0], bh ; Time count unit (=2 or >3)
  2439 0000D052 EBE9                <1> 	jmp	short systimer_4 ; 07/06/2016
  2440                              <1> 
  2441                              <1> systimer_6:
  2442 0000D054 80FF04              <1> 	cmp	bh, 4
  2443 0000D057 77F3                <1>         ja      short systimer_5  ; undefined time count unit
  2444                              <1> 	;jb	short systimer_16	
  2445                              <1> 
  2446                              <1> 	;mov	al, 1	; default (use current timer unit)
  2447                              <1> 			; countdown value is in ECX ! 
  2448                              <1> 			; max. value of ecx = 4294967296/10
  2449                              <1>         ;jmp    short systimer_0
  2450                              <1> 	;jmp	short systimer_19	
  2451 0000D059 74B6                <1> 	je	short systimer_19
  2452                              <1> 
  2453                              <1> systimer_16:
  2454                              <1> 	; bh = 3
  2455                              <1> 	; timer event via real time clock interrupt
  2456                              <1> 	; interrupt/update frequency: 1 Hz (1 tick per second)
  2457                              <1> 	
  2458 0000D05B B0B6                <1> 	mov	al, 182 ; (*) ; 18.2 * 10
  2459 0000D05D FE05[916A0100]      <1> 	inc	byte [trtc] ; timer event via real time clock
  2460 0000D063 EBAE                <1>         jmp     short systimer_0
  2461                              <1> 
  2462                              <1> systimer_7:
  2463 0000D065 A2[64030300]        <1> 	mov	[u.r0], al ; timer event number
  2464                              <1> 	;
  2465                              <1> 	; edi = address of empty timer event area
  2466 0000D06A A0[B3030300]        <1> 	mov	al, [u.uno]
  2467 0000D06F FA                  <1> 	cli 	; disable interrupts 
  2468 0000D070 AA                  <1> 	stosb	; process number
  2469 0000D071 A0[906A0100]        <1> 	mov	al, [tcallback] ; timer callback flag
  2470 0000D076 AA                  <1> 	stosb 	; 1= callback method, 0= signal response byte method
  2471 0000D077 A0[916A0100]        <1> 	mov	al, [trtc] ; timer interrupt type
  2472 0000D07C AA                  <1> 	stosb	; 1= real time clock, 0= programmable interval timer
  2473 0000D07D 88D8                <1> 	mov	al, bl ; Signal return (Response) value
  2474 0000D07F AA                  <1> 	stosb   ; response byte
  2475 0000D080 58                  <1> 	pop	eax ; (*) ; 10 or 182
  2476 0000D081 89D3                <1> 	mov	ebx, edx ; virtual address for response/signal byte
  2477 0000D083 F7E1                <1> 	mul	ecx
  2478                              <1> 	; (eax = 10 * count of 18.2 Hz timer ticks)
  2479                              <1> 	; (count down step = 10)
  2480 0000D085 AB                  <1> 	stosd  ; count limit (reset value)
  2481 0000D086 AB                  <1> 	stosd  ; current count value
  2482                              <1> 
  2483                              <1> 	; 19/12/2016
  2484 0000D087 803D[906A0100]00    <1> 	cmp	byte [tcallback], 0 ; timer callback method ?
  2485 0000D08E 7604                <1> 	jna	short systimer_17 ; no	
  2486 0000D090 89D8                <1> 	mov	eax, ebx ; virtual address for callback routine 
  2487 0000D092 EB0D                <1> 	jmp	short systimer_18
  2488                              <1> 
  2489                              <1> systimer_17: ; signal response byte method
  2490                              <1> 	; ebx = virtual address
  2491                              <1> 	; [u.pgdir] = page directory's physical address
  2492                              <1> 	; 20/02/2017
  2493 0000D094 FE05[926A0100]      <1> 	inc	 byte [no_page_swap] ; 1 
  2494                              <1> 			; Do not add this page to swap queue
  2495                              <1> 			; and remove it from swap queue if it is
  2496                              <1> 			; on the queue.
  2497 0000D09A E84D82FFFF          <1> 	call	get_physical_addr
  2498 0000D09F 721A                <1> 	jc	short systimer_8 ; 07/06/2016
  2499                              <1> 	; eax = physical address of the virtual address in user's space
  2500                              <1> systimer_18:
  2501 0000D0A1 AB                  <1> 	stosd	; response addr (physical) or callback addr (virtual)
  2502 0000D0A2 FE05[53650100]      <1> 	inc	byte [timer_events] ; 07/06/201
  2503                              <1> 	; 02/01/2017
  2504 0000D0A8 0FB605[B3030300]    <1> 	movzx	eax, byte [u.uno]
  2505 0000D0AF FE80[FF000300]      <1> 	inc	byte [eax+p.timer-1]	
  2506                              <1> 	;
  2507 0000D0B5 FB                  <1> 	sti 	; enable interrupts
  2508 0000D0B6 E9A7F6FFFF          <1> 	jmp	sysret
  2509                              <1> 
  2510                              <1> systimer_8:
  2511                              <1> 	; 10/06/2016
  2512                              <1> 	; 07/06/2016
  2513 0000D0BB 28C0                <1> 	sub	al, al ; 0
  2514 0000D0BD 8847F4              <1> 	mov	[edi-12], al ; clear process number (free timer event)
  2515                              <1> 	;mov	dword [edi], eax ; 0
  2516 0000D0C0 FB                  <1> 	sti
  2517 0000D0C1 A2[64030300]        <1> 	mov	[u.r0], al ; 0
  2518 0000D0C6 E977F6FFFF          <1> 	jmp	error
  2519                              <1> 
  2520                              <1> systimer_9:
  2521                              <1> 	; 10/06/2016
  2522                              <1> 	; 07/06/2016
  2523 0000D0CB 28C0                <1> 	sub	al, al
  2524 0000D0CD A2[64030300]        <1> 	mov	byte [u.r0], al ; 0
  2525 0000D0D2 3805[53650100]      <1> 	cmp     byte [timer_events], al ;  0
  2526 0000D0D8 7631                <1> 	jna	short systimer_12
  2527                              <1> 
  2528                              <1> 	; Note: ecx and edx are undefined here
  2529                              <1> 	;	(for stop timer function)
  2530                              <1> 
  2531 0000D0DA BE[60040300]        <1> 	mov	esi, timer_set  ; beginning address of timer events
  2532                              <1> 				; setting space	 
  2533 0000D0DF A0[B3030300]        <1> 	mov	al, [u.uno]
  2534                              <1> 	
  2535 0000D0E4 B710                <1> 	mov	bh, 16
  2536                              <1> 
  2537 0000D0E6 08DB                <1> 	or	bl, bl
  2538 0000D0E8 7544                <1> 	jnz	short systimer_15
  2539                              <1> 
  2540                              <1> 	; clear timer event areas belong to current process
  2541                              <1> 	; (for stopping all timer events belong to current process) 
  2542 0000D0EA FA                  <1> 	cli 	; disable interrupts
  2543                              <1> systimer_10:
  2544                              <1> 	; 10/06/2016
  2545                              <1> 	; 07/06/2016 	
  2546 0000D0EB 8A26                <1> 	mov	ah, [esi]
  2547 0000D0ED 08E4                <1> 	or	ah, ah ; 0 ?
  2548 0000D0EF 7411                <1> 	jz	short systimer_11
  2549 0000D0F1 38C4                <1> 	cmp	ah, al ; is the process number (owner) same ?
  2550 0000D0F3 750D                <1>         jne     short systimer_11 ; no
  2551                              <1> 
  2552                              <1> 	;mov	byte [esi], 0
  2553 0000D0F5 66C7060000          <1> 	mov	word [esi], 0 ; clear
  2554                              <1> 	;mov	dword [esi+12], 0 ; clear
  2555                              <1> 
  2556 0000D0FA FE0D[53650100]      <1> 	dec	byte [timer_events]
  2557 0000D100 7409                <1> 	jz	short systimer_12
  2558                              <1> 
  2559                              <1> systimer_11:
  2560 0000D102 FECF                <1> 	dec	bh
  2561 0000D104 7405                <1> 	jz	short systimer_12
  2562 0000D106 83C610              <1> 	add	esi, 16
  2563 0000D109 EBE0                <1> 	jmp	short systimer_10
  2564                              <1> 
  2565                              <1> systimer_12:
  2566 0000D10B 0FB635[B3030300]    <1> 	movzx	esi, byte [u.uno]
  2567 0000D112 08DB                <1> 	or	bl, bl ; all timer events or one timer event ?
  2568 0000D114 740C                <1> 	jz	short systimer_13
  2569 0000D116 8A9E[FF000300]      <1> 	mov	bl, [esi+p.timer-1]
  2570 0000D11C 20DB                <1> 	and	bl, bl	; previous number of timer events for the process
  2571 0000D11E 7408                <1> 	jz	short systimer_14
  2572 0000D120 FECB                <1> 	dec	bl  ; previous number of timer events for the process - 1
  2573                              <1> systimer_13:
  2574 0000D122 889E[FF000300]      <1> 	mov	[esi+p.timer-1], bl ; 0 ; no timer events for process
  2575                              <1> systimer_14:
  2576 0000D128 FB                  <1> 	sti	; enable interrupts
  2577 0000D129 E934F6FFFF          <1> 	jmp	sysret
  2578                              <1> 
  2579                              <1> systimer_15:
  2580 0000D12E 38FB                <1> 	cmp	bl, bh ; 16
  2581 0000D130 0F8707FFFFFF        <1>         ja      systimer_4      ; max. 16 timer events !
  2582                              <1> 	;
  2583 0000D136 88DA                <1> 	mov	dl, bl
  2584 0000D138 FECA                <1> 	dec	dl  ; 16 -> 15 ... 1 -> 0 
  2585 0000D13A C0E204              <1> 	shl	dl, 4 ; * 16
  2586 0000D13D 0FB6FA              <1> 	movzx	edi, dl
  2587 0000D140 01F7                <1> 	add	edi, esi ; timer_set 
  2588                              <1> 	
  2589 0000D142 3A07                <1> 	cmp	al, [edi] ; process number
  2590 0000D144 0F85F3FEFFFF        <1>         jne     systimer_4
  2591                              <1> 	
  2592                              <1> 	; same process ID
  2593 0000D14A FA                  <1> 	cli	; disable interrupts
  2594                              <1>  	; 10/06/2016 ; 02/01/2017
  2595                              <1> 	;mov	byte [edi], 0 
  2596 0000D14B 66C7070000          <1> 	mov	word [edi], 0 ; clear
  2597                              <1> 	;mov	dword [edi+12], 0 ; clear
  2598 0000D150 FE0D[53650100]      <1> 	dec	byte [timer_events]
  2599 0000D156 EBB3                <1> 	jmp	short systimer_12
  2600                              <1> 
  2601                              <1> sysvideo: ; VIDEO DATA TRANSFER FUNCTIONS
  2602                              <1> 	; 12/05/2017
  2603                              <1> 	; 11/07/2016
  2604                              <1> 	; 13/06/2016
  2605                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  2606                              <1> 	;
  2607                              <1> 	;
  2608                              <1> 	; VIDEO DATA TRANSFER FUNCTIONS:
  2609                              <1> 	;
  2610                              <1> 	; Inputs:
  2611                              <1> 	;	BH = 0 = VIDEO BIOS Mode 3, tty/text mode data transfers
  2612                              <1> 	;	     BL = 
  2613                              <1> 	;		Bits 0&1, Transfer direction
  2614                              <1> 	;	     	 	0 - System to system
  2615                              <1> 	;			1 - User to system
  2616                              <1> 	;			2 - System to user
  2617                              <1> 	;			3 - User to user
  2618                              <1> 	;		Bits 2&3, Transfer Type
  2619                              <1> 	;			0 - Display page transfer	
  2620                              <1> 	;	     		1 - Display page window transfer
  2621                              <1> 	;	     		2 - Frame/Viewport/Window address transfer
  2622                              <1> 	;			3 - Window handle transfer		
  2623                              <1> 	;
  2624                              <1> 	;	     /// BL = 0 -> System to system (display page) transfer
  2625                              <1> 	;		 CL = Source page 
  2626                              <1> 	;		 DL = Destination page
  2627                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2628                              <1> 	;		 ECX = User buffer
  2629                              <1> 	;		 DL = Video page
  2630                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2631                              <1> 	;		(window in current display page and in current mode)	 	 		
  2632                              <1> 	;		 ESI = User's buffer address
  2633                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2634                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2635                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2636                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2637                              <1>         ;                If BL = 5 ->
  2638                              <1> 	;		 EDI = Swap address (in user's memory space)
  2639                              <1> 	;		 (If swap address > 0, previous content of the window
  2640                              <1> 	;		 will be saved into swap area in user's memory space)		
  2641                              <1> 	;	     /// BL = 4 -> system to system transfer 
  2642                              <1> 	;		 ESI = System's source buffer (video page) address
  2643                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2644                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2645                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2646                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2647                              <1> 	;		 EDI = System's destination buffer (video page) address
  2648                              <1> 	;
  2649                              <1> 	;	BH = 1 = CGA Graphics (0B8000h) data transfers
  2650                              <1> 	;	     BL = 
  2651                              <1> 	;	     	0 = Fill color (color in CL] (32K)
  2652                              <1> 	;		1 = User to system display page transfer
  2653                              <1> 	;		2 = System to user display page transfer
  2654                              <1> 	;		3 = NOT bits in window (ECX, EDX)
  2655                              <1> 	;		4 = Window copy (system to system)	
  2656                              <1> 	;	     	5 = User to system window transfer
  2657                              <1> 	;	     	6 = System to user window transfer
  2658                              <1> 	;		7 = AND display page bytes with CL
  2659                              <1> 	;		8 = OR display page bytes with CL
  2660                              <1> 	;		9 = XOR display page bytes with CL
  2661                              <1> 	;
  2662                              <1> 	;	     /// BL = 0 -> Fill color  (all screen pixels)
  2663                              <1> 	;		 CL = Color value 
  2664                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2665                              <1> 	;		 ECX = User buffer
  2666                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2667                              <1> 	;		(window in current display page and in current mode)	 	 		
  2668                              <1> 	;		 ESI = User's buffer address
  2669                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2670                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2671                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2672                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2673                              <1>         ;	     /// BL = 4 -> system to system (window) transfer 
  2674                              <1> 	;		 ESI = System's source buffer (video page) address
  2675                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2676                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2677                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2678                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2679                              <1> 	;		 EDI = System's destination buffer (video page) address
  2680                              <1> 	;	     /// BL = 3 -> NOT byte in display page/memory 
  2681                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2682                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2683                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2684                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2685                              <1> 	;
  2686                              <1> 	;	BH = 2 = VGA Graphics (0A0000h) data transfers
  2687                              <1> 	;	     BL = 
  2688                              <1> 	;	     	x0h = Fill color (color in CL] (64K)
  2689                              <1> 	;		x1h = User to system display page transfer
  2690                              <1> 	;		x2h = System to user display page transfer
  2691                              <1> 	;		x3h = NOT bits in window (ECX, EDX)
  2692                              <1> 	;		x4h = Window copy (system to system)	
  2693                              <1> 	;	     	x5h = User to system window transfer
  2694                              <1> 	;	     	x6h = System to user window transfer
  2695                              <1> 	;		x7h = AND display page bytes with CL
  2696                              <1> 	;		x8h = OR display page bytes with CL
  2697                              <1> 	;		x9h = XOR display page bytes with CL
  2698                              <1> 	;		x = 0 -> screen width = 320
  2699                              <1> 	;		x = 1 -> screen width = 640
  2700                              <1> 	;		x = 2 -> screen width = 800
  2701                              <1> 	;
  2702                              <1> 	;	     /// BL = 0 -> Fill color  (all screen pixels)
  2703                              <1> 	;		 CL = Color value 
  2704                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2705                              <1> 	;		 ECX = User buffer
  2706                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2707                              <1> 	;		(window in current display page and in current mode)	 	 		
  2708                              <1> 	;		 ESI = User's buffer address
  2709                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2710                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2711                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2712                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2713                              <1>        	;	     /// BL = 4 -> system to system (window) transfer 
  2714                              <1> 	;		 ESI = System's source buffer (video page) address
  2715                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2716                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2717                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2718                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2719                              <1> 	;		 EDI = System's destination buffer (video page) address
  2720                              <1> 	;	     /// BL = 3 -> NOT byte in display page/memory 
  2721                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2722                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2723                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2724                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2725                              <1> 	;
  2726                              <1> 	;	BH = 3 = Super VGA, LINEAR FRAME BUFFER data transfers
  2727                              <1> 	;	     BL = 
  2728                              <1> 	;	     	0 = Fill color (color in ECX] (Frame buffer size)
  2729                              <1> 	;		1 = User to system display page transfer
  2730                              <1> 	;		2 = System to user display page transfer
  2731                              <1> 	;		3 = NOT bits in window (ECX, EDX)
  2732                              <1> 	;		4 = Window copy (system to system)	
  2733                              <1> 	;	     	5 = User to system window transfer
  2734                              <1> 	;	     	6 = System to user window transfer
  2735                              <1> 	;		7 = AND display page bytes with ECX
  2736                              <1> 	;		8 = OR display page bytes with ECX
  2737                              <1> 	;		9 = XOR display page bytes with ECX
  2738                              <1> 	;
  2739                              <1> 	;	     /// BL = 0 -> Fill color  (all screen pixels)
  2740                              <1> 	;		 CL = Color value 
  2741                              <1> 	;	     /// BL = 1&2 -> user to system & system to user transfer
  2742                              <1> 	;		 ECX = User buffer
  2743                              <1> 	;	     /// BL = 5&6 -> user to system, system to user transfer 
  2744                              <1> 	;		(window in current display page and in current mode)	 	 		
  2745                              <1> 	;		 ESI = User's buffer address
  2746                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2747                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2748                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2749                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2750                              <1> 	;	     /// BL = 4 -> system to system (window) transfer 
  2751                              <1> 	;		 ESI = System's source buffer (video page) address
  2752                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2753                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2754                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2755                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2756                              <1> 	;		 EDI = System's destination buffer (video page) address
  2757                              <1> 	;	     /// BL = 3 -> NOT byte in display page/memory 
  2758                              <1> 	;		 ECX Low 16 bits = Top left column (X1 position)
  2759                              <1> 	;		 ECX High 16 bits = Top row (Y1 position)
  2760                              <1> 	;		 EDX Low 16 bits = Bottom right column (X2 position)
  2761                              <1> 	;		 EDX High 16 bits = Bottom row (Y2 position)
  2762                              <1> 	;
  2763                              <1> 	; Outputs:
  2764                              <1> 	;	EAX = transfer/byte count
  2765                              <1> 	;
  2766                              <1> 	;	NOTE: If the source or destination address passes out of
  2767                              <1> 	;	video pages (display memory limits), data will not be transferred
  2768                              <1> 	;	and EAX will return as 0.
  2769                              <1> 	;
  2770                              <1> 	;
  2771                              <1> 	; DIRECT (STANDARD VGA/CGA) DISPLAY MEMORY ACCESS FUNCTIONS:
  2772                              <1> 	;
  2773                              <1> 	;	BH = 4 = CGA direct video memory (0B8000h, 32K) access
  2774                              <1> 	;		Page directory & page tables of the user's
  2775                              <1> 	;		program will be updated to direct access to
  2776                              <1> 	;		0B8000h (32K) video (CGA, color) memory; if
  2777                              <1> 	;		there is not a permission  conflict or lock!  
  2778                              <1> 	;	        (User's program/process will have permision to
  2779                              <1> 	;		access locked display memory if the owner is
  2780                              <1> 	;		it's parent.)
  2781                              <1>         ;
  2782                              <1> 	;	    Screen width = 320	
  2783                              <1> 	;
  2784                              <1> 	;	BH = 5 = VGA direct video memory (0A0000h, 64K) access
  2785                              <1> 	;		Page directory & page tables of the user's
  2786                              <1> 	;		program will be updated to direct access to
  2787                              <1> 	;		0A0000h (64K) video (VGA) memory; if there is not
  2788                              <1> 	;		a permission conflict or lock!  
  2789                              <1> 	;	        (User's program/process will have permision to
  2790                              <1> 	;		access locked display memory if the owner is
  2791                              <1> 	;		it's parent.)
  2792                              <1> 	;		
  2793                              <1> 	;	    BL = Screen width (320, 640, 800) 
  2794                              <1> 	;			
  2795                              <1> 	; Outputs:
  2796                              <1> 	;	EAX = Display mmory address for direct access
  2797                              <1> 	;	      0A0000h for VGA, 0B8000h for CGA	
  2798                              <1> 	;	(Display memory size: 32K for CGA, 64K for VGA)
  2799                              <1> 	; 	EAX = 0 if display page access permission has been denied. 
  2800                              <1> 	;	      (Locked!) 	
  2801                              <1> 	;	      	 	
  2802                              <1> 	; LINEAR FRAME BUFFER ACCESS FUNCTIONS:
  2803                              <1> 	;
  2804                              <1> 	;	BH = 6 = Linear Frame Buffer direct video memory access
  2805                              <1> 	;
  2806                              <1> 	;		Page directory & page tables of the user's
  2807                              <1> 	;		program will be updated to direct access to
  2808                              <1> 	;		the configured LFB (Linear Frame Buffer) address,
  2809                              <1> 	;		if there is not a permission conflict or lock!  
  2810                              <1> 	;	        (User's program/process will have permision to
  2811                              <1> 	;		access locked display memory if the owner is
  2812                              <1> 	;		it's parent.)
  2813                              <1> 	;			
  2814                              <1> 	;		Return: EAX = Linear Frame Buffer address
  2815                              <1> 	;			EDX = Frame Buffer Size in bytes	
  2816                              <1> 	;	
  2817                              <1> 	;	BH = 7 = Get Linear Frame Buffer info (for current mode)
  2818                              <1> 	;		
  2819                              <1> 	;		Return:
  2820                              <1> 	;		EAX = Frame Buffer Address (0 = is not in use)
  2821                              <1> 	;		EDX = Frame Buffer Size in bytes
  2822                              <1> 	;		BL = Current Video Mode
  2823                              <1> 	;		     BL = 0FFh -> Super VGA (Extended VGA)
  2824                              <1> 	;		     If BL = 0FFh, 
  2825                              <1>         ;                       BH = 0 = 16 colors
  2826                              <1> 	;			BH = 1 = 256 colors
  2827                              <1> 	;			BH = 2 = 66536 colors
  2828                              <1> 	;			BH = 3 = 24 bits TRUE (16M) colors
  2829                              <1> 	;			BH = 4 = 32 bits TRUE (16M) colors
  2830                              <1> 	;		ECX = Pixel resolution
  2831                              <1> 	;		      CX = Width (640, 800, 1024, 1366, 1920)
  2832                              <1> 	;		      High 16 bits of ECX = Height  
  2833                              <1> 	;
  2834                              <1> 	;	NOTE: Each process will have it's own frame buffer
  2835                              <1> 	;	      address and resolution parameters in 'u' area.
  2836                              <1> 	;	      Then, if the current frame buffer & resolution
  2837                              <1> 	;	      is different, frame buffer r/w functions
  2838                              <1> 	;	      will use scale factor to convert process's
  2839                              <1>         ;             pixel coordinates to actual screen coordinates.                            
  2840                              <1> 	;	      resolution -> dimensional scale
  2841                              <1> 	;	      color size -> color scale
  2842                              <1> 	;	     * RGB (TRUE) colors to 256 colors conversion:	
  2843                              <1>         ;             TRUE Colors -> 8,8,8 (R,G,B; byte 0 is R)            
  2844                              <1> 	;	      256 colors -> 2,2,2,2 (R,G,B,L; bit 0&1 is R)
  2845                              <1> 	; 		  bit 6&7 -> luminosity base level (0,1,2,3)
  2846                              <1> 	;		  bit 4&5 -> blue level (0,1,2,3)
  2847                              <1> 	;		  bit 2%3 -> green level (0,1,2,3)
  2848                              <1> 	;		  bit 0&1 -> red level (0,1,2,3)
  2849                              <1> 	;	      Example: total red level : luminosity + red level   				
  2850                              <1> 	;	      Luminosity base level: 0 -> 16
  2851                              <1> 	;		 		     1 -> 32
  2852                              <1> 	;				     2 -> 64
  2853                              <1> 	;				     3 -> 128
  2854                              <1> 	;	      Color level:	
  2855                              <1> 	;				    0 -> 0
  2856                              <1> 	;				    1 -> luminosity level
  2857                              <1> 	;				    2 -> luminosity level + 64
  2858                              <1> 	;				    3 -> 255
  2859                              <1> 	;	     Luminosity base level = min (R,G,B)
  2860                              <1> 	;			if it is <16, it will be set to 16
  2861                              <1> 	;	     Color levels: Color values are fixed to (nearest) 
  2862                              <1> 	;		   one of all possible set level (step) values
  2863                              <1> 	;		   (according to luminosity base level); then
  2864                              <1> 	;		   color levels are set to R-L, G-L, B-L.
  2865                              <1> 	;	 For example: If luminosity base level is 32
  2866                              <1> 	;		  all possible set values are 0, 32, 96, 255. 	 			
  2867                              <1> 	;
  2868                              <1> 	;	    * RGB (TRUE) colors to 16 colors conversion:
  2869                              <1> 	;	    16 colors: R, B,G, L bits (4 bits)
  2870                              <1> 	;	    	   If any one of R,G,B >= 128 L = 1 		     	
  2871                              <1>  	;		   If max. value of (R,G,B) >= 32, it is 1
  2872                              <1> 	;		      else all color bits (R&G&B&L) are 0
  2873                              <1> 	;		   If the second value >= max. value / 2
  2874                              <1> 	;		      it is 1
  2875                              <1> 	;		   If third value value >= max. value / 2
  2876                              <1> 	;		      it is 1
  2877                              <1> 	;	    Example: R = 132, G = 64, B = 78
  2878                              <1> 	;		     L = 1, R = 1
  2879                              <1> 	;		     G < 66 --> G = 0
  2880                              <1> 	;		     B >= 66 --> B = 1	 		 	  								 	 					
  2881                              <1> 
  2882                              <1> 	; 16/05/2016
  2883 0000D158 31C0                <1> 	xor	eax, eax
  2884 0000D15A A3[64030300]        <1> 	mov	[u.r0], eax
  2885                              <1> 
  2886 0000D15F 20FF                <1> 	and	bh, bh
  2887 0000D161 0F8572020000        <1> 	jnz	sysvideo_13 ; 11/07/2016
  2888                              <1> 	
  2889                              <1> 	; Video mode 0, 80*25 text mode, CGA 16 colors  ; [CRT_MODE] = 3
  2890 0000D167 88DF                <1> 	mov	bh, bl
  2891 0000D169 C0EF02              <1> 	shr	bh, 2
  2892 0000D16C 20FF                <1> 	and	bh, bh
  2893 0000D16E 0F8598000000        <1>         jnz     sysvideo_4
  2894 0000D174 BF00800B00          <1> 	mov	edi, 0B8000h
  2895 0000D179 20D2                <1> 	and	dl, dl
  2896 0000D17B 7413                <1> 	jz	short sysvideo_1
  2897 0000D17D 80FA07              <1> 	cmp	dl, 7
  2898 0000D180 0F87DCF5FFFF        <1> 	ja	sysret
  2899                              <1> sysvideo_0:
  2900 0000D186 81C7A00F0000        <1> 	add	edi, 80*25*2
  2901 0000D18C FECA                <1> 	dec	dl
  2902 0000D18E 75F6                <1> 	jnz	short sysvideo_0	
  2903                              <1> sysvideo_1:	
  2904 0000D190 80E303              <1> 	and	bl, 3
  2905 0000D193 7530                <1> 	jnz	short sysvideo_2
  2906 0000D195 80F907              <1> 	cmp	cl, 7
  2907 0000D198 0F87C4F5FFFF        <1> 	ja	sysret
  2908                              <1> 	; system to system video/display page transfer (mode 0)
  2909 0000D19E BE00800B00          <1> 	mov	esi, 0B8000h
  2910 0000D1A3 0FB6C1              <1> 	movzx	eax, cl
  2911 0000D1A6 BAA00F0000          <1> 	mov	edx, 80*25*2
  2912 0000D1AB F7E2                <1> 	mul	edx
  2913 0000D1AD 01C6                <1> 	add	esi, eax
  2914 0000D1AF B9A00F0000          <1> 	mov	ecx, (80*25*2)
  2915 0000D1B4 890D[64030300]      <1> 	mov	[u.r0], ecx
  2916 0000D1BA 66C1E902            <1> 	shr	cx, 2 ; /4
  2917 0000D1BE F3A5                <1> 	rep	movsd
  2918 0000D1C0 E99DF5FFFF          <1> 	jmp	sysret	
  2919                              <1> sysvideo_2:  
  2920 0000D1C5 80FB02              <1> 	cmp	bl, 2
  2921 0000D1C8 0F8794F5FFFF        <1>         ja      sysret
  2922 0000D1CE 721F                <1> 	jb	short sysvideo_3
  2923                              <1> 	; system to user video/display page transfer (mode 0)
  2924 0000D1D0 89FE                <1> 	mov	esi, edi
  2925 0000D1D2 89CF                <1> 	mov	edi, ecx ; user buffer
  2926 0000D1D4 B9A00F0000          <1> 	mov	ecx, 80*25*2
  2927 0000D1D9 E81F160000          <1> 	call	transfer_to_user_buffer ; fast transfer
  2928 0000D1DE 0F827EF5FFFF        <1> 	jc	sysret
  2929 0000D1E4 890D[64030300]      <1> 	mov	[u.r0], ecx
  2930 0000D1EA E973F5FFFF          <1> 	jmp	sysret 	
  2931                              <1> sysvideo_3: 
  2932                              <1> 	; user to system video/display page transfer (mode 0)	
  2933 0000D1EF 89CE                <1> 	mov	esi, ecx ; user buffer
  2934                              <1> 	; edi = video page address
  2935 0000D1F1 B9A00F0000          <1> 	mov	ecx, 80*25*2
  2936 0000D1F6 E84C160000          <1> 	call	transfer_from_user_buffer ; fast transfer
  2937 0000D1FB 0F8261F5FFFF        <1> 	jc	sysret
  2938 0000D201 890D[64030300]      <1> 	mov	[u.r0], ecx		
  2939 0000D207 E956F5FFFF          <1> 	jmp	sysret
  2940                              <1> sysvideo_4:
  2941 0000D20C 80E303              <1> 	and	bl, 3
  2942 0000D20F 0F85F6000000        <1>         jnz     sysvideo_9
  2943 0000D215 80F907              <1> 	cmp	cl, 7
  2944 0000D218 0F8744F5FFFF        <1> 	ja	sysret
  2945                              <1> 	; system to system video/display page window transfer (mode 0)
  2946 0000D21E 81FE00800B00        <1> 	cmp	esi, 0B8000h
  2947 0000D224 0F8238F5FFFF        <1> 	jb	sysret
  2948 0000D22A 81FE00FD0B00        <1> 	cmp	esi, 0B8000h+(80*25*2*8)
  2949 0000D230 0F832CF5FFFF        <1> 	jnb	sysret
  2950 0000D236 81FF00800B00        <1> 	cmp	edi, 0B8000h
  2951 0000D23C 0F8220F5FFFF        <1> 	jb	sysret
  2952 0000D242 81FF00FD0B00        <1>         cmp     edi, 0B8000h+(80*25*2*8)
  2953 0000D248 0F8314F5FFFF        <1> 	jnb	sysret
  2954                              <1> 	;
  2955 0000D24E 51                  <1> 	push	ecx
  2956 0000D24F 52                  <1> 	push	edx
  2957 0000D250 0FB7C1              <1> 	movzx	eax, cx ; top left column
  2958 0000D253 50                  <1> 	push	eax
  2959 0000D254 C1E910              <1> 	shr	ecx, 16 ; top row
  2960 0000D257 66B8A000            <1> 	mov	ax, 80*2 ; 80 colums, 160 bytes per row
  2961 0000D25B F7E1                <1> 	mul	ecx
  2962 0000D25D 01C6                <1> 	add	esi, eax
  2963 0000D25F 01C7                <1> 	add	edi, eax
  2964 0000D261 58                  <1> 	pop	eax
  2965 0000D262 66D1E0              <1> 	shl	ax, 1 ; *2 	
  2966 0000D265 01C6                <1> 	add	esi, eax
  2967 0000D267 01C7                <1> 	add	edi, eax
  2968 0000D269 5A                  <1> 	pop	edx
  2969 0000D26A 59                  <1> 	pop	ecx
  2970 0000D26B B800FD0B00          <1> 	mov	eax, 0B8000h+(80*25*2*8)
  2971 0000D270 39C6                <1> 	cmp	esi, eax
  2972 0000D272 0F83EAF4FFFF        <1> 	jnb	sysret
  2973 0000D278 39C6                <1> 	cmp	esi, eax
  2974 0000D27A 0F83E2F4FFFF        <1> 	jnb	sysret	
  2975                              <1> 
  2976 0000D280 56                  <1> 	push	esi ; ****
  2977 0000D281 57                  <1> 	push	edi ; ***
  2978 0000D282 52                  <1> 	push	edx ; **
  2979 0000D283 51                  <1> 	push	ecx ; *
  2980 0000D284 C1E910              <1> 	shr	ecx, 16 ; top row
  2981 0000D287 C1EA10              <1> 	shr	edx, 16 ; bottom row
  2982 0000D28A 83F918              <1> 	cmp	ecx, 24 ; max. 25 rows
  2983 0000D28D 7773                <1> 	ja	short sysvideo_6
  2984 0000D28F 83FA18              <1> 	cmp	edx, 24 ; max. 25 rows
  2985 0000D292 776E                <1> 	ja	short sysvideo_6		
  2986 0000D294 28CA                <1> 	sub	dl, cl
  2987 0000D296 726A                <1> 	jc	short sysvideo_6
  2988 0000D298 50                  <1> 	push	eax ; *****
  2989 0000D299 89D3                <1> 	mov	ebx, edx ; row count - 1
  2990 0000D29B B8A0000000          <1> 	mov	eax, 80*2
  2991 0000D2A0 F7E0                <1> 	mul	eax
  2992 0000D2A2 01C6                <1> 	add	esi, eax
  2993 0000D2A4 01C7                <1> 	add	edi, eax
  2994 0000D2A6 58                  <1> 	pop	eax ; *****
  2995 0000D2A7 39C6                <1> 	cmp	esi, eax
  2996 0000D2A9 7757                <1> 	ja	short sysvideo_6
  2997 0000D2AB 39C7                <1> 	cmp	edi, eax
  2998 0000D2AD 7753                <1> 	ja	short sysvideo_6
  2999 0000D2AF 59                  <1> 	pop	ecx ; *
  3000 0000D2B0 5A                  <1> 	pop	edx ; **
  3001 0000D2B1 81E1FFFF0000        <1> 	and	ecx, 0FFFFh
  3002 0000D2B7 81E2FFFF0000        <1> 	and	edx, 0FFFFh
  3003 0000D2BD 83F94F              <1> 	cmp	ecx, 79 ; max. 80 columns
  3004 0000D2C0 7742                <1> 	ja	short sysvideo_7
  3005 0000D2C2 83FA4F              <1> 	cmp	edx, 79 ; max. 80 columns
  3006 0000D2C5 773D                <1> 	ja	short sysvideo_7
  3007 0000D2C7 28CA                <1> 	sub	dl, cl
  3008 0000D2C9 7639                <1> 	jna	short sysvideo_7
  3009                              <1> 	; edx = column count (width) - 1
  3010 0000D2CB D0E2                <1> 	shl	dl, 1
  3011 0000D2CD 01D6                <1> 	add	esi, edx
  3012 0000D2CF 01D7                <1> 	add	edi, edx
  3013 0000D2D1 39C6                <1> 	cmp	esi, eax
  3014 0000D2D3 772F                <1> 	ja	short sysvideo_7
  3015 0000D2D5 39C7                <1> 	cmp	edi, eax
  3016 0000D2D7 772B                <1> 	ja	short sysvideo_7
  3017 0000D2D9 5F                  <1> 	pop	edi ; ***
  3018 0000D2DA 5E                  <1> 	pop	esi ; ****
  3019 0000D2DB FEC3                <1> 	inc	bl
  3020 0000D2DD FEC2                <1> 	inc	dl ; column count
  3021 0000D2DF 88D7                <1> 	mov	bh, dl
  3022 0000D2E1 D0E2                <1> 	shl	dl, 1
  3023 0000D2E3 B8A0000000          <1> 	mov	eax, 80*2
  3024 0000D2E8 28D0                <1> 	sub	al, dl ; (80 - columns) * 2
  3025                              <1> sysvideo_5:	
  3026 0000D2EA 88F9                <1> 	mov	cl, bh
  3027 0000D2EC 0115[64030300]      <1> 	add	[u.r0], edx
  3028 0000D2F2 F366A5              <1> 	rep	movsw
  3029 0000D2F5 01C6                <1> 	add	esi, eax ; next row
  3030 0000D2F7 01C7                <1> 	add	edi, eax ; next row
  3031 0000D2F9 FECB                <1> 	dec	bl
  3032 0000D2FB 75ED                <1> 	jnz	short sysvideo_5
  3033 0000D2FD E960F4FFFF          <1> 	jmp	sysret
  3034                              <1> 
  3035                              <1> sysvideo_6:
  3036 0000D302 59                  <1> 	pop	ecx ; *
  3037 0000D303 5A                  <1> 	pop	edx ; **
  3038                              <1> sysvideo_7:	
  3039 0000D304 5F                  <1> 	pop	edi ; ***
  3040 0000D305 5E                  <1> 	pop	esi ; ****
  3041 0000D306 E957F4FFFF          <1> 	jmp	sysret
  3042                              <1> 
  3043                              <1> sysvideo_9:  
  3044 0000D30B 80FB02              <1> 	cmp	bl, 2
  3045 0000D30E 0F874EF4FFFF        <1>         ja      sysret
  3046                              <1> 
  3047 0000D314 56                  <1> 	push	esi ; ****
  3048 0000D315 57                  <1> 	push	edi ; ***
  3049 0000D316 52                  <1> 	push	edx ; **
  3050 0000D317 51                  <1> 	push	ecx ; *
  3051                              <1> 
  3052 0000D318 C1E910              <1> 	shr	ecx, 16 ; top row
  3053 0000D31B C1EA10              <1> 	shr	edx, 16 ; bottom row
  3054 0000D31E 83F918              <1> 	cmp	ecx, 24 ; max. 25 rows
  3055 0000D321 77DF                <1> 	ja	short sysvideo_6
  3056 0000D323 83FA18              <1> 	cmp	edx, 24 ; max. 25 rows
  3057 0000D326 77DA                <1> 	ja	short sysvideo_6		
  3058 0000D328 28CA                <1> 	sub	dl, cl
  3059 0000D32A 72D6                <1> 	jc	short sysvideo_6
  3060                              <1> 
  3061 0000D32C 88CD                <1> 	mov	ch, cl ; top row
  3062 0000D32E 8A0D[EE580100]      <1> 	mov	cl, [ACTIVE_PAGE]
  3063 0000D334 BFA00F0000          <1> 	mov	edi, 80*25*2
  3064 0000D339 D3E7                <1> 	shl	edi, cl 
  3065 0000D33B 81C760700B00        <1> 	add	edi, 0B8000h - 80*25*2
  3066                              <1> 
  3067 0000D341 88D7                <1> 	mov	bh, dl ; row count - 1
  3068 0000D343 88EA                <1> 	mov	dl, ch ; top row
  3069 0000D345 B8A0000000          <1> 	mov	eax, 80*2
  3070 0000D34A F7E2                <1> 	mul	edx
  3071 0000D34C 01C7                <1> 	add	edi, eax
  3072                              <1> 
  3073 0000D34E 59                  <1> 	pop	ecx ; *
  3074 0000D34F 5A                  <1> 	pop	edx ; **
  3075 0000D350 81E1FFFF0000        <1> 	and	ecx, 0FFFFh
  3076 0000D356 81E2FFFF0000        <1> 	and	edx, 0FFFFh
  3077 0000D35C 83F94F              <1> 	cmp	ecx, 79 ; max. 80 columns
  3078 0000D35F 77A3                <1> 	ja	short sysvideo_7
  3079 0000D361 83FA4F              <1> 	cmp	edx, 79 ; max. 80 columns
  3080 0000D364 779E                <1> 	ja	short sysvideo_7
  3081                              <1> 	
  3082 0000D366 28CA                <1> 	sub	dl, cl
  3083 0000D368 769A                <1> 	jna	short sysvideo_7
  3084                              <1> 	
  3085 0000D36A 0FB6C1              <1> 	movzx	eax, cl ; left column
  3086 0000D36D D0E0                <1> 	shl	al, 1  ; column * 2
  3087 0000D36F 01C7                <1> 	add	edi, eax
  3088                              <1> 
  3089 0000D371 FEC2                <1> 	inc	dl ; column count
  3090 0000D373 D0E2                <1> 	shl	dl, 1
  3091 0000D375 88D1                <1> 	mov	cl, dl ; column count * 2
  3092 0000D377 B2A0                <1> 	mov	dl, 80*2
  3093 0000D379 58                  <1> 	pop	eax ; *** (swap address)
  3094 0000D37A 5E                  <1> 	pop	esi ; ****
  3095 0000D37B FEC7                <1> 	inc	bh
  3096                              <1> 	
  3097                              <1> 	;mov	edx, 80*2
  3098 0000D37D B2A0                <1> 	mov	dl, 80*2
  3099                              <1> 	;
  3100 0000D37F 80FB01              <1> 	cmp	bl, 1
  3101 0000D382 7735                <1> 	ja	short sysvideo_11
  3102                              <1> 
  3103                              <1> 	; user to system video/display page window transfer (mode 0)	
  3104 0000D384 21C0                <1> 	and	eax, eax ; swap address
  3105 0000D386 7413                <1> 	jz	short sysvideo_10 ; no window swap
  3106                              <1> 	; save previous window content in user's buffer (swap address)
  3107 0000D388 56                  <1> 	push	esi ; user buffer
  3108 0000D389 57                  <1> 	push	edi ; beginning address of the window
  3109 0000D38A 89FE                <1> 	mov	esi, edi
  3110 0000D38C 89C7                <1> 	mov	edi, eax
  3111 0000D38E E86A140000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3112 0000D393 5F                  <1> 	pop	edi
  3113 0000D394 5E                  <1> 	pop	esi
  3114 0000D395 0F82C7F3FFFF        <1> 	jc	sysret
  3115                              <1> sysvideo_10: 
  3116                              <1> 	; user to system video/display page window transfer (mode 0)	
  3117                              <1> 	; esi =	user buffer
  3118 0000D39B E8A7140000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3119 0000D3A0 0F82BCF3FFFF        <1> 	jc	sysret
  3120 0000D3A6 010D[64030300]      <1> 	add	[u.r0], ecx
  3121 0000D3AC 01D7                <1> 	add	edi, edx ; next row
  3122 0000D3AE 01CE                <1> 	add	esi, ecx
  3123 0000D3B0 FECF                <1> 	dec	bh
  3124 0000D3B2 75E7                <1> 	jnz	short sysvideo_10
  3125 0000D3B4 E9A9F3FFFF          <1> 	jmp	sysret
  3126                              <1> 	
  3127                              <1> sysvideo_11:
  3128                              <1> 	; system to user video/display page window transfer (mode 0)
  3129 0000D3B9 87FE                <1> 	xchg	edi, esi
  3130                              <1> sysvideo_12:
  3131                              <1> 	; esi = beginning address of the window
  3132                              <1> 	; edi =	user buffer	
  3133 0000D3BB E83D140000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3134 0000D3C0 0F829CF3FFFF        <1> 	jc	sysret
  3135 0000D3C6 010D[64030300]      <1> 	add	[u.r0], ecx
  3136 0000D3CC 01D6                <1> 	add	esi, edx ; next row
  3137 0000D3CE 01CF                <1> 	add	edi, ecx
  3138 0000D3D0 FECF                <1> 	dec	bh
  3139 0000D3D2 75E7                <1> 	jnz	short sysvideo_12
  3140 0000D3D4 E989F3FFFF          <1> 	jmp	sysret
  3141                              <1> 
  3142                              <1> sysvideo_13:
  3143 0000D3D9 80FF01              <1> 	cmp	bh, 1
  3144 0000D3DC 0F871F030000        <1>         ja      sysvideo_38
  3145                              <1> 	; BH = 1 = CGA Graphics (0B8000h) data transfers
  3146                              <1> 
  3147 0000D3E2 20DB                <1> 	and	bl, bl
  3148 0000D3E4 751A                <1> 	jnz	short sysvideo_14
  3149                              <1> 
  3150                              <1> 	; BL =	0 = Fill color (color in CL] (32K)
  3151                              <1> 
  3152 0000D3E6 88C8                <1> 	mov	al, cl
  3153 0000D3E8 B900800000          <1> 	mov	ecx, 32768
  3154 0000D3ED 66890D[64030300]    <1> 	mov	[u.r0], cx
  3155 0000D3F4 BF00800B00          <1> 	mov	edi, 0B8000h
  3156 0000D3F9 F3AB                <1> 	rep	stosd
  3157 0000D3FB E962F3FFFF          <1> 	jmp	sysret
  3158                              <1> 
  3159                              <1> sysvideo_14:
  3160 0000D400 80FB01              <1> 	cmp	bl, 1
  3161 0000D403 7723                <1> 	ja	short sysvideo_16
  3162                              <1> 
  3163 0000D405 89CE                <1> 	mov	esi, ecx ; user buffer
  3164                              <1> 	; BL = 1 = user to system video/display page transfer
  3165                              <1> sysvideo_15:	
  3166 0000D407 BF00800B00          <1> 	mov	edi, 0B8000h
  3167                              <1> 	; edi = video page address
  3168 0000D40C B900800000          <1> 	mov	ecx, 32768
  3169 0000D411 E831140000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3170 0000D416 0F8246F3FFFF        <1> 	jc	sysret ; [u.r0] = 0
  3171 0000D41C 66890D[64030300]    <1> 	mov	[u.r0], cx		
  3172 0000D423 E93AF3FFFF          <1> 	jmp	sysret
  3173                              <1> 
  3174                              <1> sysvideo_16:
  3175 0000D428 80FB02              <1> 	cmp	bl, 2	
  3176 0000D42B 7723                <1> 	ja	short sysvideo_18
  3177                              <1> 
  3178 0000D42D 89CF                <1> 	mov	edi, ecx ; user buffer
  3179                              <1> 	; BL = 2 = system to user video/display page transfer
  3180                              <1> sysvideo_17:	
  3181 0000D42F BE00800B00          <1> 	mov	esi, 0B8000h
  3182 0000D434 B900800000          <1> 	mov	ecx, 32768
  3183 0000D439 E8BF130000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3184 0000D43E 0F821EF3FFFF        <1> 	jc	sysret ; [u.r0] = 0
  3185 0000D444 66890D[64030300]    <1> 	mov	[u.r0], cx
  3186 0000D44B E912F3FFFF          <1> 	jmp	sysret 	
  3187                              <1> 
  3188                              <1> sysvideo_18:
  3189 0000D450 80FB03              <1> 	cmp	bl, 3
  3190 0000D453 777E                <1> 	ja	short sysvideo_23
  3191                              <1> 
  3192                              <1> 	; BL = 3 = NOT bits in window (ECX, EDX)
  3193                              <1> 
  3194 0000D455 BF00800B00          <1> 	mov	edi, 0B8000h
  3195 0000D45A 89FE                <1> 	mov	esi, edi
  3196                              <1> 	
  3197 0000D45C 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3198 0000D45E 7716                <1> 	ja	short sysvideo_20 ; window
  3199                              <1> 	; full screen (update)
  3200 0000D460 B900800000          <1> 	mov	ecx, 32768
  3201 0000D465 66890D[64030300]    <1> 	mov	[u.r0], cx
  3202                              <1> sysvideo_19:
  3203 0000D46C F616                <1> 	not	byte [esi] ; NOT operation
  3204 0000D46E 46                  <1> 	inc	esi
  3205 0000D46F E2FB                <1> 	loop	sysvideo_19
  3206 0000D471 E9ECF2FFFF          <1> 	jmp	sysret
  3207                              <1> sysvideo_20:
  3208 0000D476 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3209 0000D479 6629C8              <1> 	sub	ax, cx  ; - top left column
  3210 0000D47C 0F82E0F2FFFF        <1>         jb      sysret ; invalid
  3211 0000D482 6640                <1> 	inc	ax ; same column no == 1 column	 
  3212 0000D484 50                  <1> 	push	eax ; byte count per window row
  3213 0000D485 52                  <1> 	push	edx
  3214 0000D486 BB40010000          <1> 	mov	ebx, 320 ; screen width
  3215 0000D48B 89C8                <1> 	mov	eax, ecx
  3216 0000D48D C1E810              <1> 	shr	eax, 16  ; top row
  3217 0000D490 F7E3                <1> 	mul	ebx
  3218 0000D492 6689CA              <1> 	mov	dx, cx ; top left column
  3219 0000D495 01D0                <1> 	add	eax, edx
  3220 0000D497 01C6                <1> 	add	esi, eax ; start address 
  3221 0000D499 59                  <1> 	pop	ecx ; edx
  3222 0000D49A 89C8                <1> 	mov	eax, ecx
  3223 0000D49C C1E810              <1> 	shr	eax, 16 ; bottom row
  3224 0000D49F F7E3                <1> 	mul	ebx
  3225 0000D4A1 6689CA              <1> 	mov	dx, cx ; bottom right column
  3226 0000D4A4 01D0                <1> 	add	eax, edx
  3227 0000D4A6 01C7                <1> 	add	edi, eax ; stop address (included)
  3228 0000D4A8 5A                  <1> 	pop	edx ; byte count per window row
  3229 0000D4A9 81FFFFFF0B00        <1> 	cmp	edi, 0BFFFFh
  3230 0000D4AF 0F87ADF2FFFF        <1> 	ja	sysret	
  3231 0000D4B5 56                  <1> 	push	esi
  3232 0000D4B6 4E                  <1> 	dec	esi
  3233                              <1> sysvideo_21:
  3234 0000D4B7 89D1                <1> 	mov	ecx, edx
  3235                              <1> sysvideo_22:
  3236 0000D4B9 46                  <1> 	inc	esi
  3237 0000D4BA F616                <1> 	not	byte [esi]
  3238 0000D4BC E2FB                <1> 	loop	sysvideo_22
  3239 0000D4BE 01DE                <1> 	add	esi, ebx ; bytes per screen row
  3240                              <1> 	;
  3241 0000D4C0 39FE                <1> 	cmp	esi, edi ; stop address (included in loop)
  3242 0000D4C2 76F3                <1> 	jna	short sysvideo_21
  3243 0000D4C4 5E                  <1> 	pop	esi
  3244 0000D4C5 29F7                <1> 	sub	edi, esi
  3245 0000D4C7 66893D[64030300]    <1> 	mov	[u.r0], di
  3246 0000D4CE E98FF2FFFF          <1> 	jmp	sysret
  3247                              <1> 
  3248                              <1> sysvideo_23:
  3249 0000D4D3 80FB04              <1> 	cmp	bl, 4
  3250 0000D4D6 0F87A7000000        <1>         ja      sysvideo_26
  3251                              <1> 
  3252                              <1> 	; BL = 4 = window copy (system to system)
  3253                              <1> 
  3254 0000D4DC B800800B00          <1> 	mov	eax, 0B8000h
  3255 0000D4E1 39C6                <1> 	cmp	esi, eax
  3256 0000D4E3 0F8279F2FFFF        <1> 	jb	sysret
  3257 0000D4E9 39C7                <1> 	cmp	edi, eax
  3258 0000D4EB 0F8271F2FFFF        <1> 	jb	sysret
  3259 0000D4F1 6605FF7F            <1> 	add	ax, 7FFFh ; 32767
  3260 0000D4F5 39C6                <1> 	cmp	esi, eax
  3261 0000D4F7 0F8765F2FFFF        <1> 	ja	sysret
  3262 0000D4FD 39C7                <1> 	cmp	edi, eax
  3263 0000D4FF 0F875DF2FFFF        <1> 	ja	sysret
  3264                              <1> 	
  3265 0000D505 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3266 0000D507 7714                <1> 	ja	short sysvideo_24 ; window
  3267                              <1> 	; full screen copy
  3268 0000D509 89C1                <1> 	mov	ecx, eax
  3269 0000D50B 29F9                <1> 	sub	ecx, edi
  3270 0000D50D 6641                <1> 	inc	cx
  3271 0000D50F 66890D[64030300]    <1> 	mov	[u.r0], cx
  3272 0000D516 F3A4                <1> 	rep	movsb
  3273 0000D518 E945F2FFFF          <1> 	jmp	sysret
  3274                              <1> sysvideo_24:
  3275 0000D51D 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3276 0000D520 6629C8              <1> 	sub	ax, cx  ; - top left column
  3277 0000D523 0F8239F2FFFF        <1>         jb      sysret ; invalid
  3278 0000D529 6640                <1> 	inc	ax ; same column no == 1 column	 
  3279 0000D52B 50                  <1> 	push	eax ; byte count per window row
  3280                              <1> 	;
  3281 0000D52C 52                  <1> 	push	edx
  3282 0000D52D BB40010000          <1> 	mov	ebx, 320 ; screen width
  3283 0000D532 89C8                <1> 	mov	eax, ecx
  3284 0000D534 C1E810              <1> 	shr	eax, 16	; top row
  3285 0000D537 F7E3                <1> 	mul	ebx
  3286 0000D539 6689CA              <1> 	mov	dx, cx ; top left column
  3287 0000D53C 01D0                <1> 	add	eax, edx
  3288 0000D53E 01C7                <1> 	add	edi, eax ; start address 
  3289 0000D540 01C6                <1> 	add	esi, eax
  3290 0000D542 59                  <1> 	pop	ecx ; edx
  3291 0000D543 89C8                <1> 	mov	eax, ecx
  3292 0000D545 C1E810              <1> 	shr	eax, 16 ; bottom row
  3293 0000D548 F7E3                <1> 	mul	ebx
  3294 0000D54A 6689CA              <1> 	mov	dx, cx ; bottom right column
  3295 0000D54D 01D0                <1> 	add	eax, edx
  3296 0000D54F 5A                  <1> 	pop	edx ; byte count per window row
  3297 0000D550 0500800B00          <1> 	add	eax, 0B8000h
  3298 0000D555 3DFFFF0B00          <1> 	cmp	eax, 0BFFFFh
  3299 0000D55A 0F8702F2FFFF        <1> 	ja	sysret
  3300 0000D560 57                  <1> 	push	edi ; start address 
  3301 0000D561 50                  <1> 	push	eax ; stop address (included)
  3302                              <1> sysvideo_25:
  3303 0000D562 89D1                <1> 	mov	ecx, edx
  3304 0000D564 F3A4                <1> 	rep	movsb
  3305 0000D566 4F                  <1> 	dec	edi
  3306 0000D567 4E                  <1> 	dec	esi
  3307 0000D568 01DF                <1> 	add	edi, ebx ; bytes per screen row
  3308 0000D56A 01DE                <1> 	add	esi, ebx
  3309                              <1> 	;
  3310 0000D56C 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3311 0000D56F 76F1                <1> 	jna	short sysvideo_25
  3312 0000D571 5B                  <1> 	pop	ebx ; stop address
  3313 0000D572 5F                  <1> 	pop	edi ; start address
  3314 0000D573 29FB                <1> 	sub	ebx, edi
  3315 0000D575 6643                <1> 	inc	bx
  3316 0000D577 66891D[64030300]    <1> 	mov	[u.r0], bx	
  3317 0000D57E E9DFF1FFFF          <1> 	jmp	sysret
  3318                              <1> 
  3319                              <1> sysvideo_26:
  3320 0000D583 80FB05              <1> 	cmp	bl, 5
  3321 0000D586 0F8795000000        <1>         ja      sysvideo_29
  3322                              <1> 
  3323                              <1> 	; BL = 5 = window copy (user to system)
  3324                              <1> 
  3325 0000D58C B800800B00          <1> 	mov	eax, 0B8000h
  3326 0000D591 39C7                <1> 	cmp	edi, eax
  3327 0000D593 0F82C9F1FFFF        <1> 	jb	sysret
  3328 0000D599 6605FF7F            <1> 	add	ax, 7FFFh ; 32767
  3329 0000D59D 39C7                <1> 	cmp	edi, eax
  3330 0000D59F 0F87BDF1FFFF        <1> 	ja	sysret
  3331                              <1> 
  3332                              <1> 	; esi = user buffer (in user's memory space)
  3333 0000D5A5 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3334 0000D5A7 0F865AFEFFFF        <1>         jna     sysvideo_15 ; full screen copy
  3335                              <1> 
  3336 0000D5AD 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3337 0000D5B0 6629C8              <1> 	sub	ax, cx  ; - top left column
  3338 0000D5B3 0F82A9F1FFFF        <1>         jb      sysret ; invalid
  3339 0000D5B9 6640                <1> 	inc	ax ; same column no == 1 column	 
  3340 0000D5BB 50                  <1> 	push	eax ; byte count per window row
  3341                              <1> 
  3342 0000D5BC 52                  <1> 	push	edx
  3343 0000D5BD BB40010000          <1> 	mov	ebx, 320 ; screen width
  3344 0000D5C2 89C8                <1> 	mov	eax, ecx
  3345 0000D5C4 C1E810              <1> 	shr	eax, 16	; top row
  3346 0000D5C7 F7E3                <1> 	mul	ebx
  3347 0000D5C9 6689CA              <1> 	mov	dx, cx ; top left column
  3348 0000D5CC 01D0                <1> 	add	eax, edx
  3349 0000D5CE 01C7                <1> 	add	edi, eax ; start address 
  3350 0000D5D0 59                  <1> 	pop	ecx ; edx
  3351 0000D5D1 89C8                <1> 	mov	eax, ecx
  3352 0000D5D3 C1E810              <1> 	shr	eax, 16 ; bottom row
  3353 0000D5D6 F7E3                <1> 	mul	ebx
  3354 0000D5D8 6689CA              <1> 	mov	dx, cx ; bottom right column
  3355 0000D5DB 01D0                <1> 	add	eax, edx
  3356 0000D5DD 5A                  <1> 	pop	edx ; byte count per window row
  3357 0000D5DE 0500800B00          <1> 	add	eax, 0B8000h
  3358 0000D5E3 3DFFFF0B00          <1> 	cmp	eax, 0BFFFFh
  3359 0000D5E8 0F8774F1FFFF        <1> 	ja	sysret
  3360 0000D5EE 57                  <1> 	push	edi ; start address 
  3361 0000D5EF 50                  <1> 	push	eax ; stop address (included)
  3362                              <1> sysvideo_27:
  3363 0000D5F0 89D1                <1> 	mov	ecx, edx ; byte count
  3364                              <1> 	; user to system video/display page window transfer
  3365                              <1> 	; esi =	user buffer
  3366 0000D5F2 E850120000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3367 0000D5F7 7221                <1> 	jc	short sysvideo_28
  3368 0000D5F9 010D[64030300]      <1> 	add	[u.r0], ecx
  3369 0000D5FF 01DF                <1> 	add	edi, ebx ; next row
  3370 0000D601 01CE                <1> 	add	esi, ecx
  3371 0000D603 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3372 0000D606 76E8                <1> 	jna	short sysvideo_27
  3373 0000D608 5B                  <1> 	pop	ebx ; stop address
  3374 0000D609 5F                  <1> 	pop	edi ; start address
  3375 0000D60A 29FB                <1> 	sub	ebx, edi
  3376 0000D60C 6643                <1> 	inc	bx
  3377 0000D60E 66891D[64030300]    <1> 	mov	[u.r0], bx	
  3378 0000D615 E948F1FFFF          <1> 	jmp	sysret
  3379                              <1> sysvideo_28:
  3380 0000D61A 58                  <1> 	pop	eax
  3381 0000D61B 5A                  <1> 	pop	edx
  3382 0000D61C E941F1FFFF          <1> 	jmp	sysret
  3383                              <1> 
  3384                              <1> sysvideo_29:
  3385 0000D621 80FB06              <1> 	cmp	bl, 6
  3386 0000D624 0F8797000000        <1>         ja      sysvideo_32
  3387                              <1> 
  3388                              <1> 	; BL = 6 = window copy (system to user)
  3389                              <1> 
  3390 0000D62A 89F7                <1> 	mov	edi, esi ; user buffer
  3391                              <1> 
  3392 0000D62C B800800B00          <1> 	mov	eax, 0B8000h
  3393 0000D631 39C6                <1> 	cmp	esi, eax
  3394 0000D633 0F8229F1FFFF        <1> 	jb	sysret
  3395 0000D639 6605FF7F            <1> 	add	ax, 7FFFh ; 32767
  3396 0000D63D 39C6                <1> 	cmp	esi, eax
  3397 0000D63F 0F871DF1FFFF        <1> 	ja	sysret
  3398                              <1> 
  3399                              <1> 	; edi = user buffer (in user's memory space)
  3400 0000D645 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3401 0000D647 0F86E2FDFFFF        <1>         jna     sysvideo_17 ; full screen copy
  3402                              <1> 
  3403 0000D64D 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3404 0000D650 6629C8              <1> 	sub	ax, cx  ; - top left column
  3405 0000D653 0F8209F1FFFF        <1>         jb      sysret ; invalid
  3406 0000D659 6640                <1> 	inc	ax ; same column no == 1 column	 
  3407 0000D65B 50                  <1> 	push	eax ; byte count per window row
  3408                              <1> 
  3409 0000D65C 52                  <1> 	push	edx
  3410 0000D65D BB40010000          <1> 	mov	ebx, 320 ; screen width
  3411 0000D662 89C8                <1> 	mov	eax, ecx
  3412 0000D664 C1E810              <1> 	shr	eax, 16	; top row
  3413 0000D667 F7E3                <1> 	mul	ebx
  3414 0000D669 6689CA              <1> 	mov	dx, cx ; top left column
  3415 0000D66C 01D0                <1> 	add	eax, edx
  3416 0000D66E 01C6                <1> 	add	esi, eax ; start address 
  3417 0000D670 59                  <1> 	pop	ecx ; edx
  3418 0000D671 89C8                <1> 	mov	eax, ecx
  3419 0000D673 C1E810              <1> 	shr	eax, 16 ; bottom row
  3420 0000D676 F7E3                <1> 	mul	ebx
  3421 0000D678 6689CA              <1> 	mov	dx, cx ; bottom right column
  3422 0000D67B 01D0                <1> 	add	eax, edx
  3423 0000D67D 5A                  <1> 	pop	edx ; byte count per window row
  3424 0000D67E 0500800B00          <1> 	add	eax, 0B8000h
  3425 0000D683 3DFFFF0B00          <1> 	cmp	eax, 0BFFFFh
  3426 0000D688 0F87D4F0FFFF        <1> 	ja	sysret
  3427 0000D68E 56                  <1> 	push	esi ; start address 
  3428 0000D68F 50                  <1> 	push	eax ; stop address (included)
  3429                              <1> sysvideo_30:
  3430 0000D690 89D1                <1> 	mov	ecx, edx ; byte count
  3431                              <1> 	; user to system video/display page window transfer
  3432                              <1> 	; esi =	user buffer
  3433 0000D692 E866110000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3434 0000D697 7221                <1> 	jc	short sysvideo_31
  3435 0000D699 010D[64030300]      <1> 	add	[u.r0], ecx
  3436 0000D69F 01DF                <1> 	add	edi, ebx ; next row
  3437 0000D6A1 01CE                <1> 	add	esi, ecx
  3438 0000D6A3 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3439 0000D6A6 76E8                <1> 	jna	short sysvideo_30
  3440 0000D6A8 5B                  <1> 	pop	ebx ; stop address
  3441 0000D6A9 5F                  <1> 	pop	edi ; start address
  3442 0000D6AA 29FB                <1> 	sub	ebx, edi
  3443 0000D6AC 6643                <1> 	inc	bx
  3444 0000D6AE 66891D[64030300]    <1> 	mov	[u.r0], bx	
  3445 0000D6B5 E9A8F0FFFF          <1> 	jmp	sysret
  3446                              <1> sysvideo_31:
  3447 0000D6BA 58                  <1> 	pop	eax
  3448 0000D6BB 5A                  <1> 	pop	edx
  3449 0000D6BC E9A1F0FFFF          <1> 	jmp	sysret
  3450                              <1> 
  3451                              <1> sysvideo_32:
  3452 0000D6C1 80FB07              <1> 	cmp	bl, 7
  3453 0000D6C4 770F                <1> 	ja	short sysvideo_34
  3454                              <1> 
  3455                              <1> 	; BL = 7 = AND display page bytes with CL
  3456                              <1> 
  3457 0000D6C6 BE00800B00          <1> 	mov	esi, 0B8000h
  3458 0000D6CB B900800000          <1> 	mov	ecx, 32768
  3459                              <1> sysvideo_33:
  3460 0000D6D0 200E                <1> 	and	byte [esi], cl
  3461 0000D6D2 46                  <1> 	inc	esi
  3462 0000D6D3 E2FB                <1> 	loop	sysvideo_33
  3463                              <1> 
  3464                              <1> sysvideo_34:
  3465 0000D6D5 80FB08              <1> 	cmp	bl, 8
  3466 0000D6D8 770F                <1> 	ja	short sysvideo_36
  3467                              <1> 
  3468                              <1> 	; BL = 8 = OR display page bytes with CL
  3469                              <1> 
  3470 0000D6DA BE00800B00          <1> 	mov	esi, 0B8000h
  3471 0000D6DF B900800000          <1> 	mov	ecx, 32768
  3472                              <1> sysvideo_35:
  3473 0000D6E4 080E                <1> 	or	byte [esi], cl
  3474 0000D6E6 46                  <1> 	inc	esi
  3475 0000D6E7 E2FB                <1> 	loop	sysvideo_35	
  3476                              <1> 
  3477                              <1> sysvideo_36:
  3478 0000D6E9 80FB09              <1> 	cmp	bl, 9
  3479 0000D6EC 0F8770F0FFFF        <1>         ja      sysret ; nothing to do
  3480                              <1> 
  3481                              <1> 	; BL = 9 = XOR display page bytes with CL
  3482                              <1> 
  3483 0000D6F2 BE00800B00          <1> 	mov	esi, 0B8000h
  3484 0000D6F7 B900800000          <1> 	mov	ecx, 32768
  3485                              <1> sysvideo_37:
  3486 0000D6FC 300E                <1> 	xor	byte [esi], cl
  3487 0000D6FE 46                  <1> 	inc	esi
  3488 0000D6FF E2FB                <1> 	loop	sysvideo_37
  3489                              <1> 
  3490                              <1> sysvideo_38:
  3491 0000D701 80FF02              <1> 	cmp	bh, 2
  3492 0000D704 0F8733030000        <1>         ja      sysvideo_64
  3493                              <1> 	; BH = 2 = VGA Graphics (0A0000h) data transfers
  3494                              <1> 
  3495 0000D70A 88DC                <1> 	mov	ah, bl
  3496 0000D70C 80E30F              <1> 	and	bl, 0Fh	
  3497 0000D70F C0EC04              <1> 	shr	ah, 4
  3498 0000D712 C1E310              <1> 	shl	ebx, 16
  3499 0000D715 66BB4001            <1> 	mov	bx, 320 ; 320*200, 320*240
  3500 0000D719 20E4                <1> 	and	ah, ah
  3501 0000D71B 7413                <1> 	jz	short sysvideo_39
  3502 0000D71D 66D1E3              <1> 	shl	bx, 1 ; 640*200, 640 * 400, 640*480
  3503 0000D720 80FC02              <1> 	cmp	ah, 2
  3504 0000D723 720B                <1> 	jb	short sysvideo_39 		
  3505 0000D725 0F8737F0FFFF        <1> 	ja	sysret ; invalid
  3506                              <1> 	; 800*600
  3507 0000D72B 6681C3A000          <1> 	add	bx, 160 ; 800
  3508                              <1> sysvideo_39:
  3509 0000D730 C1CB10              <1> 	ror	ebx, 16
  3510                              <1> 		
  3511 0000D733 20DB                <1>  	and	bl, bl
  3512 0000D735 7519                <1> 	jnz	short sysvideo_40
  3513                              <1> 
  3514                              <1> 	; BL =	0 = Fill color (color in CL] (64K)
  3515                              <1> 
  3516 0000D737 88C8                <1> 	mov	al, cl
  3517 0000D739 B900000100          <1> 	mov	ecx, 65536
  3518 0000D73E 890D[64030300]      <1> 	mov	[u.r0], ecx
  3519 0000D744 BF00000A00          <1> 	mov	edi, 0A0000h
  3520 0000D749 F3AB                <1> 	rep	stosd
  3521 0000D74B E912F0FFFF          <1> 	jmp	sysret
  3522                              <1> 
  3523                              <1> sysvideo_40:
  3524 0000D750 80FB01              <1> 	cmp	bl, 1
  3525 0000D753 7722                <1> 	ja	short sysvideo_42
  3526                              <1> 
  3527 0000D755 89CE                <1> 	mov	esi, ecx ; user buffer
  3528                              <1> 	; BL = 1 = user to system video/display page transfer
  3529                              <1> sysvideo_41:	
  3530 0000D757 BF00000A00          <1> 	mov	edi, 0A0000h
  3531                              <1> 	; edi = video page address
  3532 0000D75C B900000100          <1> 	mov	ecx, 65536
  3533 0000D761 E8E1100000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3534 0000D766 0F82F6EFFFFF        <1> 	jc	sysret ; [u.r0] = 0
  3535 0000D76C 890D[64030300]      <1> 	mov	[u.r0], ecx		
  3536 0000D772 E9EBEFFFFF          <1> 	jmp	sysret
  3537                              <1> 
  3538                              <1> sysvideo_42:
  3539 0000D777 80FB02              <1> 	cmp	bl, 2	
  3540 0000D77A 7722                <1> 	ja	short sysvideo_44
  3541                              <1> 
  3542 0000D77C 89CF                <1> 	mov	edi, ecx ; user buffer
  3543                              <1> 	; BL = 2 = system to user video/display page transfer
  3544                              <1> sysvideo_43:	
  3545 0000D77E BE00000A00          <1> 	mov	esi, 0A0000h
  3546 0000D783 B900000100          <1> 	mov	ecx, 65536
  3547 0000D788 E870100000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3548 0000D78D 0F82CFEFFFFF        <1> 	jc	sysret ; [u.r0] = 0
  3549 0000D793 890D[64030300]      <1> 	mov	[u.r0], ecx
  3550 0000D799 E9C4EFFFFF          <1> 	jmp	sysret 	
  3551                              <1> 
  3552                              <1> sysvideo_44:
  3553 0000D79E 80FB03              <1> 	cmp	bl, 3
  3554 0000D7A1 777A                <1> 	ja	short sysvideo_49
  3555                              <1> 
  3556                              <1> 	; BL = 3 = NOT bits in window (ECX, EDX)
  3557                              <1> 
  3558 0000D7A3 BF00000A00          <1> 	mov	edi, 0A0000h
  3559 0000D7A8 89FE                <1> 	mov	esi, edi
  3560                              <1> 	
  3561 0000D7AA 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3562 0000D7AC 770B                <1> 	ja	short sysvideo_45 ; window
  3563                              <1> 	; full screen (update)
  3564 0000D7AE B900000100          <1> 	mov	ecx, 65536
  3565 0000D7B3 890D[64030300]      <1> 	mov	[u.r0], ecx
  3566                              <1> sysvideo_45:
  3567 0000D7B9 F616                <1> 	not	byte [esi] ; NOT operation
  3568 0000D7BB 46                  <1> 	inc	esi
  3569 0000D7BC E2FB                <1> 	loop	sysvideo_45
  3570 0000D7BE E99FEFFFFF          <1> 	jmp	sysret
  3571                              <1> sysvideo_46:
  3572 0000D7C3 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3573 0000D7C6 6629C8              <1> 	sub	ax, cx  ; - top left column
  3574 0000D7C9 0F8293EFFFFF        <1>         jb      sysret ; invalid
  3575 0000D7CF 6640                <1> 	inc	ax ; same column no == 1 column	 
  3576 0000D7D1 50                  <1> 	push	eax ; byte count per window row
  3577 0000D7D2 52                  <1> 	push	edx
  3578 0000D7D3 C1EB10              <1> 	shr	ebx, 16 ; 320,640,800 : screen width
  3579 0000D7D6 89C8                <1> 	mov	eax, ecx
  3580 0000D7D8 C1E810              <1> 	shr	eax, 16  ; top row
  3581 0000D7DB F7E3                <1> 	mul	ebx
  3582 0000D7DD 6689CA              <1> 	mov	dx, cx ; top left column
  3583 0000D7E0 01D0                <1> 	add	eax, edx
  3584 0000D7E2 01C6                <1> 	add	esi, eax ; start address 
  3585 0000D7E4 59                  <1> 	pop	ecx ; edx
  3586 0000D7E5 89C8                <1> 	mov	eax, ecx
  3587 0000D7E7 C1E810              <1> 	shr	eax, 16 ; bottom row
  3588 0000D7EA F7E3                <1> 	mul	ebx
  3589 0000D7EC 6689CA              <1> 	mov	dx, cx ; bottom right column
  3590 0000D7EF 01D0                <1> 	add	eax, edx
  3591 0000D7F1 01C7                <1> 	add	edi, eax ; stop address (included)
  3592 0000D7F3 5A                  <1> 	pop	edx ; byte count per window row
  3593 0000D7F4 81FFFFFF0A00        <1> 	cmp	edi, 0AFFFFh
  3594 0000D7FA 0F8762EFFFFF        <1> 	ja	sysret	
  3595 0000D800 56                  <1> 	push	esi
  3596 0000D801 4E                  <1> 	dec	esi
  3597                              <1> sysvideo_47:
  3598 0000D802 89D1                <1> 	mov	ecx, edx
  3599                              <1> sysvideo_48:
  3600 0000D804 46                  <1> 	inc	esi
  3601 0000D805 F616                <1> 	not	byte [esi]
  3602 0000D807 E2FB                <1> 	loop	sysvideo_48
  3603 0000D809 01DE                <1> 	add	esi, ebx ; bytes per screen row
  3604                              <1> 	;
  3605 0000D80B 39FE                <1> 	cmp	esi, edi ; stop address (included in loop)
  3606 0000D80D 76F3                <1> 	jna	short sysvideo_47
  3607 0000D80F 5E                  <1> 	pop	esi
  3608 0000D810 29F7                <1> 	sub	edi, esi
  3609 0000D812 893D[64030300]      <1> 	mov	[u.r0], edi
  3610 0000D818 E945EFFFFF          <1> 	jmp	sysret
  3611                              <1> 
  3612                              <1> sysvideo_49:
  3613 0000D81D 80FB04              <1> 	cmp	bl, 4
  3614 0000D820 0F87A1000000        <1>         ja      sysvideo_52
  3615                              <1> 
  3616                              <1> 	; BL = 4 = window copy (system to system)
  3617                              <1> 
  3618 0000D826 B800000A00          <1> 	mov	eax, 0A0000h
  3619 0000D82B 39C6                <1> 	cmp	esi, eax
  3620 0000D82D 0F822FEFFFFF        <1> 	jb	sysret
  3621 0000D833 39C7                <1> 	cmp	edi, eax
  3622 0000D835 0F8227EFFFFF        <1> 	jb	sysret
  3623 0000D83B 6683C0FF            <1> 	add	ax, 0FFFFh ; 65535
  3624 0000D83F 39C6                <1> 	cmp	esi, eax
  3625 0000D841 0F871BEFFFFF        <1> 	ja	sysret
  3626 0000D847 39C7                <1> 	cmp	edi, eax
  3627 0000D849 0F8713EFFFFF        <1> 	ja	sysret
  3628                              <1> 	
  3629 0000D84F 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3630 0000D851 7712                <1> 	ja	short sysvideo_50 ; window
  3631                              <1> 	; full screen copy
  3632 0000D853 89C1                <1> 	mov	ecx, eax
  3633 0000D855 29F9                <1> 	sub	ecx, edi
  3634 0000D857 41                  <1> 	inc	ecx
  3635 0000D858 890D[64030300]      <1> 	mov	[u.r0], ecx
  3636 0000D85E F3A4                <1> 	rep	movsb
  3637 0000D860 E9FDEEFFFF          <1> 	jmp	sysret
  3638                              <1> sysvideo_50:
  3639 0000D865 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3640 0000D868 6629C8              <1> 	sub	ax, cx  ; - top left column
  3641 0000D86B 0F82F1EEFFFF        <1>         jb      sysret ; invalid
  3642 0000D871 6640                <1> 	inc	ax ; same column no == 1 column	 
  3643 0000D873 50                  <1> 	push	eax ; byte count per window row
  3644                              <1> 	;
  3645 0000D874 52                  <1> 	push	edx
  3646 0000D875 C1EB10              <1> 	shr	ebx, 16 ; 320,640,800 : screen width
  3647 0000D878 89C8                <1> 	mov	eax, ecx
  3648 0000D87A C1E810              <1> 	shr	eax, 16	; top row
  3649 0000D87D F7E3                <1> 	mul	ebx
  3650 0000D87F 6689CA              <1> 	mov	dx, cx ; top left column
  3651 0000D882 01D0                <1> 	add	eax, edx
  3652 0000D884 01C7                <1> 	add	edi, eax ; start address 
  3653 0000D886 01C6                <1> 	add	esi, eax
  3654 0000D888 59                  <1> 	pop	ecx ; edx
  3655 0000D889 89C8                <1> 	mov	eax, ecx
  3656 0000D88B C1E810              <1> 	shr	eax, 16 ; bottom row
  3657 0000D88E F7E3                <1> 	mul	ebx
  3658 0000D890 6689CA              <1> 	mov	dx, cx ; bottom right column
  3659 0000D893 01D0                <1> 	add	eax, edx
  3660 0000D895 5A                  <1> 	pop	edx ; byte count per window row
  3661 0000D896 0500000A00          <1> 	add	eax, 0A0000h
  3662 0000D89B 3DFFFF0A00          <1> 	cmp	eax, 0AFFFFh
  3663 0000D8A0 0F87BCEEFFFF        <1> 	ja	sysret
  3664 0000D8A6 57                  <1> 	push	edi ; start address 
  3665 0000D8A7 50                  <1> 	push	eax ; stop address (included)
  3666                              <1> sysvideo_51:
  3667 0000D8A8 89D1                <1> 	mov	ecx, edx
  3668 0000D8AA F3A4                <1> 	rep	movsb
  3669 0000D8AC 4F                  <1> 	dec	edi
  3670 0000D8AD 4E                  <1> 	dec	esi
  3671 0000D8AE 01DF                <1> 	add	edi, ebx ; bytes per screen row
  3672 0000D8B0 01DE                <1> 	add	esi, ebx
  3673                              <1> 	;
  3674 0000D8B2 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3675 0000D8B5 76F1                <1> 	jna	short sysvideo_51
  3676 0000D8B7 5B                  <1> 	pop	ebx ; stop address
  3677 0000D8B8 5F                  <1> 	pop	edi ; start address
  3678 0000D8B9 29FB                <1> 	sub	ebx, edi
  3679 0000D8BB 43                  <1> 	inc	ebx
  3680 0000D8BC 891D[64030300]      <1> 	mov	[u.r0], ebx	
  3681 0000D8C2 E99BEEFFFF          <1> 	jmp	sysret
  3682                              <1> 
  3683                              <1> sysvideo_52:
  3684 0000D8C7 80FB05              <1> 	cmp	bl, 5
  3685 0000D8CA 0F8791000000        <1>         ja      sysvideo_55
  3686                              <1> 
  3687                              <1> 	; BL = 5 = window copy (user to system)
  3688                              <1> 
  3689 0000D8D0 B800000A00          <1> 	mov	eax, 0A0000h
  3690 0000D8D5 39C7                <1> 	cmp	edi, eax
  3691 0000D8D7 0F8285EEFFFF        <1> 	jb	sysret
  3692 0000D8DD 6683C0FF            <1> 	add	ax, 0FFFFh ; 65535
  3693 0000D8E1 39C7                <1> 	cmp	edi, eax
  3694 0000D8E3 0F8779EEFFFF        <1> 	ja	sysret
  3695                              <1> 
  3696                              <1> 	; esi = user buffer (in user's memory space)
  3697 0000D8E9 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3698 0000D8EB 0F8666FEFFFF        <1>         jna     sysvideo_41 ; full screen copy
  3699                              <1> 
  3700 0000D8F1 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3701 0000D8F4 6629C8              <1> 	sub	ax, cx  ; - top left column
  3702 0000D8F7 0F8265EEFFFF        <1>         jb      sysret ; invalid
  3703 0000D8FD 6640                <1> 	inc	ax ; same column no == 1 column	 
  3704 0000D8FF 50                  <1> 	push	eax ; byte count per window row
  3705                              <1> 
  3706 0000D900 52                  <1> 	push	edx
  3707 0000D901 C1EB10              <1> 	shr	ebx, 16 ; 320,640,800 : screen width
  3708 0000D904 89C8                <1> 	mov	eax, ecx
  3709 0000D906 C1E810              <1> 	shr	eax, 16	; top row
  3710 0000D909 F7E3                <1> 	mul	ebx
  3711 0000D90B 6689CA              <1> 	mov	dx, cx ; top left column
  3712 0000D90E 01D0                <1> 	add	eax, edx
  3713 0000D910 01C7                <1> 	add	edi, eax ; start address 
  3714 0000D912 59                  <1> 	pop	ecx ; edx
  3715 0000D913 89C8                <1> 	mov	eax, ecx
  3716 0000D915 C1E810              <1> 	shr	eax, 16 ; bottom row
  3717 0000D918 F7E3                <1> 	mul	ebx
  3718 0000D91A 6689CA              <1> 	mov	dx, cx ; bottom right column
  3719 0000D91D 01D0                <1> 	add	eax, edx
  3720 0000D91F 5A                  <1> 	pop	edx ; byte count per window row
  3721 0000D920 0500000A00          <1> 	add	eax, 0A0000h
  3722 0000D925 3DFFFF0A00          <1> 	cmp	eax, 0AFFFFh
  3723 0000D92A 0F8732EEFFFF        <1> 	ja	sysret
  3724 0000D930 57                  <1> 	push	edi ; start address 
  3725 0000D931 50                  <1> 	push	eax ; stop address (included)
  3726                              <1> sysvideo_53:
  3727 0000D932 89D1                <1> 	mov	ecx, edx ; byte count
  3728                              <1> 	; user to system video/display page window transfer
  3729                              <1> 	; esi =	user buffer
  3730 0000D934 E80E0F0000          <1> 	call	transfer_from_user_buffer ; fast transfer
  3731 0000D939 721F                <1> 	jc	short sysvideo_54
  3732 0000D93B 010D[64030300]      <1> 	add	[u.r0], ecx
  3733 0000D941 01DF                <1> 	add	edi, ebx ; next row
  3734 0000D943 01CE                <1> 	add	esi, ecx
  3735 0000D945 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3736 0000D948 76E8                <1> 	jna	short sysvideo_53
  3737 0000D94A 5B                  <1> 	pop	ebx ; stop address
  3738 0000D94B 5F                  <1> 	pop	edi ; start address
  3739 0000D94C 29FB                <1> 	sub	ebx, edi
  3740 0000D94E 43                  <1> 	inc	ebx
  3741 0000D94F 891D[64030300]      <1> 	mov	[u.r0], ebx	
  3742 0000D955 E908EEFFFF          <1> 	jmp	sysret
  3743                              <1> sysvideo_54:
  3744 0000D95A 58                  <1> 	pop	eax
  3745 0000D95B 5A                  <1> 	pop	edx
  3746 0000D95C E901EEFFFF          <1> 	jmp	sysret
  3747                              <1> 
  3748                              <1> sysvideo_55:
  3749 0000D961 80FB06              <1> 	cmp	bl, 6
  3750 0000D964 0F8793000000        <1>         ja      sysvideo_58
  3751                              <1> 
  3752                              <1> 	; BL = 6 = window copy (system to user)
  3753                              <1> 
  3754 0000D96A 89F7                <1> 	mov	edi, esi ; user buffer
  3755                              <1> 
  3756 0000D96C B800000A00          <1> 	mov	eax, 0A0000h
  3757 0000D971 39C6                <1> 	cmp	esi, eax
  3758 0000D973 0F82E9EDFFFF        <1> 	jb	sysret
  3759 0000D979 6683C0FF            <1> 	add	ax, 0FFFFh ; 65535
  3760 0000D97D 39C6                <1> 	cmp	esi, eax
  3761 0000D97F 0F87DDEDFFFF        <1> 	ja	sysret
  3762                              <1> 
  3763                              <1> 	; edi = user buffer (in user's memory space)
  3764 0000D985 39CA                <1> 	cmp	edx, ecx ; bottom-right > top-left ?
  3765 0000D987 0F86A2FAFFFF        <1>         jna     sysvideo_17 ; full screen copy
  3766                              <1> 
  3767 0000D98D 0FB7C2              <1> 	movzx	eax, dx ; bottom right column
  3768 0000D990 6629C8              <1> 	sub	ax, cx  ; - top left column
  3769 0000D993 0F82C9EDFFFF        <1>         jb      sysret ; invalid
  3770 0000D999 6640                <1> 	inc	ax ; same column no == 1 column	 
  3771 0000D99B 50                  <1> 	push	eax ; byte count per window row
  3772                              <1> 
  3773 0000D99C 52                  <1> 	push	edx
  3774 0000D99D C1EB10              <1> 	shr	ebx, 16 ; 320, 640,800 ; screen width
  3775 0000D9A0 89C8                <1> 	mov	eax, ecx
  3776 0000D9A2 C1E810              <1> 	shr	eax, 16	; top row
  3777 0000D9A5 F7E3                <1> 	mul	ebx
  3778 0000D9A7 6689CA              <1> 	mov	dx, cx ; top left column
  3779 0000D9AA 01D0                <1> 	add	eax, edx
  3780 0000D9AC 01C6                <1> 	add	esi, eax ; start address 
  3781 0000D9AE 59                  <1> 	pop	ecx ; edx
  3782 0000D9AF 89C8                <1> 	mov	eax, ecx
  3783 0000D9B1 C1E810              <1> 	shr	eax, 16 ; bottom row
  3784 0000D9B4 F7E3                <1> 	mul	ebx
  3785 0000D9B6 6689CA              <1> 	mov	dx, cx ; bottom right column
  3786 0000D9B9 01D0                <1> 	add	eax, edx
  3787 0000D9BB 5A                  <1> 	pop	edx ; byte count per window row
  3788 0000D9BC 0500000A00          <1> 	add	eax, 0A0000h
  3789 0000D9C1 3DFFFF0A00          <1> 	cmp	eax, 0AFFFFh
  3790 0000D9C6 0F8796EDFFFF        <1> 	ja	sysret
  3791 0000D9CC 56                  <1> 	push	esi ; start address 
  3792 0000D9CD 50                  <1> 	push	eax ; stop address (included)
  3793                              <1> sysvideo_56:
  3794 0000D9CE 89D1                <1> 	mov	ecx, edx ; byte count
  3795                              <1> 	; user to system video/display page window transfer
  3796                              <1> 	; esi =	user buffer
  3797 0000D9D0 E8280E0000          <1> 	call	transfer_to_user_buffer ; fast transfer
  3798 0000D9D5 721F                <1> 	jc	short sysvideo_57
  3799 0000D9D7 010D[64030300]      <1> 	add	[u.r0], ecx
  3800 0000D9DD 01DF                <1> 	add	edi, ebx ; next row
  3801 0000D9DF 01CE                <1> 	add	esi, ecx
  3802 0000D9E1 3B3C24              <1> 	cmp	edi, [esp] ; stop addr(included in loop)
  3803 0000D9E4 76E8                <1> 	jna	short sysvideo_56
  3804 0000D9E6 5B                  <1> 	pop	ebx ; stop address
  3805 0000D9E7 5F                  <1> 	pop	edi ; start address
  3806 0000D9E8 29FB                <1> 	sub	ebx, edi
  3807 0000D9EA 43                  <1> 	inc	ebx
  3808 0000D9EB 891D[64030300]      <1> 	mov	[u.r0], ebx	
  3809 0000D9F1 E96CEDFFFF          <1> 	jmp	sysret
  3810                              <1> sysvideo_57:
  3811 0000D9F6 58                  <1> 	pop	eax
  3812 0000D9F7 5A                  <1> 	pop	edx
  3813 0000D9F8 E965EDFFFF          <1> 	jmp	sysret
  3814                              <1> 
  3815                              <1> sysvideo_58:
  3816 0000D9FD 80FB07              <1> 	cmp	bl, 7
  3817 0000DA00 770F                <1> 	ja	short sysvideo_60
  3818                              <1> 
  3819                              <1> 	; BL = 7 = AND display page bytes with CL
  3820                              <1> 
  3821 0000DA02 BE00000A00          <1> 	mov	esi, 0A0000h
  3822 0000DA07 B900000100          <1> 	mov	ecx, 65536
  3823                              <1> sysvideo_59:
  3824 0000DA0C 200E                <1> 	and	byte [esi], cl
  3825 0000DA0E 46                  <1> 	inc	esi
  3826 0000DA0F E2FB                <1> 	loop	sysvideo_59
  3827                              <1> 
  3828                              <1> sysvideo_60:
  3829 0000DA11 80FB08              <1> 	cmp	bl, 8
  3830 0000DA14 770F                <1> 	ja	short sysvideo_62
  3831                              <1> 
  3832                              <1> 	; BL = 8 = OR display page bytes with CL
  3833                              <1> 
  3834 0000DA16 BE00000A00          <1> 	mov	esi, 0A0000h
  3835 0000DA1B B900000100          <1> 	mov	ecx, 65536
  3836                              <1> sysvideo_61:
  3837 0000DA20 080E                <1> 	or	byte [esi], cl
  3838 0000DA22 46                  <1> 	inc	esi
  3839 0000DA23 E2FB                <1> 	loop	sysvideo_61	
  3840                              <1> 
  3841                              <1> sysvideo_62:
  3842 0000DA25 80FB09              <1> 	cmp	bl, 9
  3843 0000DA28 0F8734EDFFFF        <1>         ja      sysret ; nothing to do
  3844                              <1> 
  3845                              <1> 	; BL = 9 = XOR display page bytes with CL
  3846                              <1> 
  3847 0000DA2E BE00000A00          <1> 	mov	esi, 0A0000h
  3848 0000DA33 B900000100          <1> 	mov	ecx, 65536
  3849                              <1> sysvideo_63:
  3850 0000DA38 300E                <1> 	xor	byte [esi], cl
  3851 0000DA3A 46                  <1> 	inc	esi
  3852 0000DA3B E2FB                <1> 	loop	sysvideo_63
  3853                              <1> 
  3854                              <1> sysvideo_64:
  3855 0000DA3D 80FF03              <1> 	cmp	bh, 3
  3856 0000DA40 7464                <1> 	je	short sysvideo_68
  3857 0000DA42 80FF04              <1> 	cmp	bh, 4
  3858 0000DA45 7721                <1> 	ja	short sysvideo_65
  3859                              <1> 	
  3860                              <1> 	; BH = 4
  3861                              <1> 	; Direct User Access for CGA video memory.
  3862                              <1> 	; Setup user's page tables for direct access to 0B8000h.
  3863                              <1> 	;
  3864                              <1> 	; Permission checks are not implemented yet !
  3865                              <1> 	; (11/07/2016)
  3866                              <1> 
  3867 0000DA47 B800800B00          <1> 	mov	eax, 0B8000h
  3868 0000DA4C B908000000          <1> 	mov	ecx, 8 ; 8 pages (8*4K=32K)
  3869 0000DA51 89C3                <1> 	mov	ebx, eax ; 12/05/2017 ; virtual = physical
  3870 0000DA53 E8A67CFFFF          <1> 	call	direct_memory_access	
  3871 0000DA58 0F8204EDFFFF        <1> 	jc	sysret
  3872                              <1> 	; eax = 0B8000h if there is not an error
  3873 0000DA5E A3[64030300]        <1> 	mov	[u.r0], eax
  3874 0000DA63 E9FAECFFFF          <1> 	jmp	sysret
  3875                              <1> 
  3876                              <1> sysvideo_65:
  3877 0000DA68 80FF05              <1> 	cmp	bh, 5
  3878 0000DA6B 7721                <1> 	ja	short sysvideo_66
  3879                              <1> 
  3880                              <1> 	; BH = 5
  3881                              <1> 	; Direct User Access for VGA video memory.
  3882                              <1> 	; Setup user's page tables for direct access to 0A0000h.
  3883                              <1> 	;
  3884                              <1> 	; Permission checks are not implemented yet !
  3885                              <1> 	; (11/07/2016)
  3886                              <1> 
  3887 0000DA6D B800000A00          <1> 	mov	eax, 0A0000h
  3888 0000DA72 B910000000          <1> 	mov	ecx, 16 ; 16 pages (16*4K=64K)
  3889 0000DA77 89C3                <1> 	mov	ebx, eax ; 12/05/2017 ; virtual = physical
  3890 0000DA79 E8807CFFFF          <1> 	call	direct_memory_access	
  3891 0000DA7E 0F82DEECFFFF        <1> 	jc	sysret
  3892                              <1> 	; eax = 0A0000h if there is not an error
  3893 0000DA84 A3[64030300]        <1> 	mov	[u.r0], eax
  3894 0000DA89 E9D4ECFFFF          <1> 	jmp	sysret
  3895                              <1> 
  3896                              <1> sysvideo_66:
  3897 0000DA8E 80FF06              <1> 	cmp	bh, 6
  3898 0000DA91 7705                <1> 	ja	short sysvideo_67
  3899                              <1> 	; BH = 6
  3900                              <1> 	; Direct User Access for (Super VGA) Linear Frame Buffer.
  3901                              <1> 	; Setup user's page tables for direct access to LFB.
  3902                              <1> 	;
  3903                              <1> 	; Not implemented yet !
  3904                              <1> 	; (11/07/2016)
  3905 0000DA93 E9CAECFFFF          <1> 	jmp	sysret
  3906                              <1> 
  3907                              <1> sysvideo_67:
  3908 0000DA98 80FF07              <1> 	cmp	bh, 7
  3909 0000DA9B 0F87C1ECFFFF        <1> 	ja	sysret ; invalid !
  3910                              <1> 
  3911                              <1> 	; BH = 7
  3912                              <1> 	; Get (Super/Extended VGA) Linear Frame Buffer info.
  3913                              <1> 	;
  3914                              <1> 	; Not implemented yet !
  3915                              <1> 	; (11/07/2016)
  3916 0000DAA1 E9BCECFFFF          <1> 	jmp	sysret
  3917                              <1> 
  3918                              <1> sysvideo_68:
  3919                              <1> 	; BH = 3
  3920                              <1> 	; Super VGA, LINEAR FRAME BUFFER data transfers
  3921                              <1> 	; Not implemented for yet ! (11/07/2016)
  3922 0000DAA6 E9B7ECFFFF          <1> 	jmp	sysret
  3923                              <1> 
  3924                              <1> mkdir:
  3925                              <1> 	; 04/12/2015 (14 byte directory names)
  3926                              <1> 	; 12/10/2015
  3927                              <1> 	; 17/06/2015 (Retro UNIX 386 v1 - Beginning)
  3928                              <1> 	; 29/04/2013 - 01/08/2013 (Retro UNIX 8086 v1)
  3929                              <1> 	;
  3930                              <1> 	; 'mkdir' makes a directory entry from the name pointed to
  3931                              <1> 	; by u.namep into the current directory.
  3932                              <1> 	;
  3933                              <1> 	; INPUTS ->
  3934                              <1> 	;    u.namep - points to a file name 
  3935                              <1> 	;	           that is about to be a directory entry.
  3936                              <1> 	;    ii - current directory's i-number.	
  3937                              <1> 	; OUTPUTS ->
  3938                              <1> 	;    u.dirbuf+2 - u.dirbuf+10 - contains file name. 
  3939                              <1> 	;    u.off - points to entry to be filled 
  3940                              <1> 	;	     in the current directory		
  3941                              <1> 	;    u.base - points to start of u.dirbuf.
  3942                              <1> 	;    r1 - contains i-number of current directory 
  3943                              <1> 	;	
  3944                              <1> 	; ((AX = R1)) output
  3945                              <1> 	;
  3946                              <1> 	;    (Retro UNIX Prototype : 11/11/2012, UNIXCOPY.ASM)
  3947                              <1>         ;    ((Modified registers: eAX, eDX, eBX, eCX, eSI, eDI, eBP))  
  3948                              <1> 	;
  3949                              <1> 
  3950                              <1> 	; 17/06/2015 - 32 bit modifications (Retro UNIX 386 v1)
  3951 0000DAAB 31C0                <1> 	xor 	eax, eax
  3952 0000DAAD BF[9A030300]        <1> 	mov     edi, u.dirbuf+2
  3953 0000DAB2 89FE                <1> 	mov	esi, edi
  3954 0000DAB4 AB                  <1> 	stosd
  3955 0000DAB5 AB                  <1> 	stosd
  3956                              <1> 	; 04/12/2015 (14 byte directory names)
  3957 0000DAB6 AB                  <1> 	stosd
  3958 0000DAB7 66AB                <1> 	stosw
  3959                              <1> 		; jsr r0,copyz; u.dirbuf+2; u.dirbuf+10. / clear this
  3960 0000DAB9 89F7                <1> 	mov	edi, esi ; offset to u.dirbuf
  3961                              <1> 	; 12/10/2015 ([u.namep] -> ebp)
  3962                              <1> 	;mov 	ebp, [u.namep]
  3963 0000DABB E80D030000          <1> 	call	trans_addr_nmbp ; convert virtual address to physical
  3964                              <1> 		; esi = physical address (page start + offset)
  3965                              <1> 		; ecx = byte count in the page (1 - 4096)
  3966                              <1> 	; edi = offset to u.dirbuf (edi is not modified in trans_addr_nm)
  3967                              <1> 		; mov u.namep,r2 / r2 points to name of directory entry
  3968                              <1> 		; mov $u.dirbuf+2,r3 / r3 points to u.dirbuf+2
  3969                              <1> mkdir_1: ; 1: 
  3970 0000DAC0 45                  <1> 	inc	ebp ; 12/10/2015
  3971                              <1> 	;
  3972                              <1> 	; / put characters in the directory name in u.dirbuf+2 - u.dirbuf+10
  3973                              <1> 	 ; 01/08/2013
  3974 0000DAC1 AC                  <1> 	lodsb
  3975                              <1> 		; movb (r2)+,r1 / move character in name to r1
  3976 0000DAC2 20C0                <1> 	and 	al, al
  3977 0000DAC4 7427                <1> 	jz 	short mkdir_3 	  
  3978                              <1> 		; beq 1f / if null, done
  3979 0000DAC6 3C2F                <1> 	cmp	al, '/'
  3980                              <1> 		; cmp r1,$'/ / is it a "/"?
  3981 0000DAC8 7414                <1> 	je	short mkdir_err
  3982                              <1> 	;je	error
  3983                              <1> 		; beq error9 / yes, error
  3984                              <1> 	; 12/10/2015
  3985 0000DACA 6649                <1> 	dec	cx
  3986 0000DACC 7505                <1> 	jnz	short mkdir_2
  3987                              <1> 	; 12/10/2015 ([u.namep] -> ebp)
  3988 0000DACE E800030000          <1> 	call	trans_addr_nm ; convert virtual address to physical
  3989                              <1> 		; esi = physical address (page start + offset)
  3990                              <1> 		; ecx = byte count in the page
  3991                              <1> 	; edi = offset to u.dirbuf (edi is not modified in trans_addr_nm)
  3992                              <1> mkdir_2:
  3993 0000DAD3 81FF[A8030300]      <1> 	cmp     edi, u.dirbuf+16 ; ; 04/12/2015 (10 -> 16) 
  3994                              <1> 		; cmp r3,$u.dirbuf+10. / have we reached the last slot for
  3995                              <1> 				     ; / a char?
  3996 0000DAD9 74E5                <1> 	je	short mkdir_1
  3997                              <1> 		; beq 1b / yes, go back
  3998 0000DADB AA                  <1> 	stosb
  3999                              <1> 		; movb r1,(r3)+ / no, put the char in the u.dirbuf
  4000 0000DADC EBE2                <1> 	jmp 	short mkdir_1
  4001                              <1> 		; br 1b / get next char
  4002                              <1> mkdir_err:
  4003                              <1> 	; 17/06/2015
  4004 0000DADE C705[C8030300]1300- <1> 	mov	dword [u.error], ERR_NOT_DIR ; 'not a valid directory !'
  4004 0000DAE6 0000                <1>
  4005 0000DAE8 E955ECFFFF          <1> 	jmp	error
  4006                              <1> 
  4007                              <1> mkdir_3: ; 1:
  4008 0000DAED A1[78030300]        <1> 	mov	eax, [u.dirp]
  4009 0000DAF2 A3[80030300]        <1> 	mov	[u.off], eax
  4010                              <1> 		; mov u.dirp,u.off / pointer to empty current directory
  4011                              <1> 				 ; / slot to u.off
  4012                              <1> wdir: ; 29/04/2013
  4013 0000DAF7 C705[84030300]-     <1>         mov     dword [u.base], u.dirbuf
  4013 0000DAFD [98030300]          <1>
  4014                              <1> 		; mov $u.dirbuf,u.base / u.base points to created file name
  4015 0000DB01 C705[88030300]1000- <1>         mov     dword [u.count], 16 ; 04/12/2015 (10 -> 16) 
  4015 0000DB09 0000                <1>
  4016                              <1> 		; mov $10.,u.count / u.count = 10
  4017 0000DB0B 66A1[51040300]      <1> 	mov	ax, [ii] 
  4018                              <1> 		; mov ii,r1 / r1 has i-number of current directory
  4019 0000DB11 B201                <1> 	mov	dl, 1 ; owner flag mask ; RETRO UNIX 8086 v1 modification !
  4020 0000DB13 E8331D0000          <1> 	call 	access
  4021                              <1> 		; jsr r0,access; 1 / get i-node and set its file up 
  4022                              <1> 				 ; / for writing
  4023                              <1> 	; AX = i-number of current directory
  4024                              <1> 	; 01/08/2013
  4025 0000DB18 FE05[C6030300]      <1> 	inc     byte [u.kcall] ; the caller is 'mkdir' sign	
  4026 0000DB1E E83C0F0000          <1> 	call	writei
  4027                              <1> 		; jsr r0,writei / write into directory
  4028 0000DB23 C3                  <1> 	retn	
  4029                              <1> 		; rts r0
  4030                              <1> 
  4031                              <1> sysexec:
  4032                              <1> 	; 18/11/2017
  4033                              <1> 	; 14/11/2017
  4034                              <1> 	; 13/11/2017
  4035                              <1> 	; 24/10/2016, 04/01/2017
  4036                              <1> 	; 24/04/2016 - TRDOS 386 (TRDOS v2.0)
  4037                              <1> 	; 23/06/2015 - 23/10/2015 (Retro UNIX 386 v1)
  4038                              <1> 	; 03/06/2013 - 06/12/2013 (Retro UNIX 8086 v1)
  4039                              <1> 	;
  4040                              <1> 	; 'sysexec' initiates execution of a file whose path name if
  4041                              <1> 	; pointed to by 'name' in the sysexec call. 
  4042                              <1> 	; 'sysexec' performs the following operations:
  4043                              <1> 	;    1. obtains i-number of file to be executed via 'namei'.
  4044                              <1> 	;    2. obtains i-node of file to be exceuted via 'iget'.
  4045                              <1> 	;    3. sets trap vectors to system routines.
  4046                              <1> 	;    4. loads arguments to be passed to executing file into
  4047                              <1> 	;	highest locations of user's core
  4048                              <1> 	;    5. puts pointers to arguments in locations immediately
  4049                              <1> 	;	following arguments.
  4050                              <1> 	;    6.	saves number of arguments in next location.
  4051                              <1> 	;    7. intializes user's stack area so that all registers
  4052                              <1> 	;	will be zeroed and the PS is cleared and the PC set
  4053                              <1> 	;	to core when 'sysret' restores registers 
  4054                              <1> 	;	and does an rti.
  4055                              <1> 	;    8. inializes u.r0 and u.sp
  4056                              <1> 	;    9. zeros user's core down to u.r0
  4057                              <1> 	;   10.	reads executable file from storage device into core
  4058                              <1> 	;	starting at location 'core'.
  4059                              <1> 	;   11.	sets u.break to point to end of user's code with
  4060                              <1> 	;	data area appended.
  4061                              <1> 	;   12.	calls 'sysret' which returns control at location
  4062                              <1> 	;	'core' via 'rti' instruction. 		  		
  4063                              <1> 	;
  4064                              <1> 	; Calling sequence:
  4065                              <1> 	;	sysexec; namep; argp
  4066                              <1> 	; Arguments:
  4067                              <1> 	;	namep - points to pathname of file to be executed
  4068                              <1> 	;	argp  - address of table of argument pointers
  4069                              <1> 	;	argp1... argpn - table of argument pointers
  4070                              <1> 	;	argp1:<...0> ... argpn:<...0> - argument strings
  4071                              <1> 	; Inputs: (arguments)
  4072                              <1> 	; Outputs: -	
  4073                              <1> 	; ...............................................................
  4074                              <1> 	;
  4075                              <1> 	; Retro UNIX 386 v1 modification: 
  4076                              <1> 	;	User application runs in it's own virtual space 
  4077                              <1> 	;	which is izolated from kernel memory (and other
  4078                              <1> 	;	memory pages) via 80386	paging in ring 3 
  4079                              <1> 	;	privilige mode. Virtual start address is always 0.
  4080                              <1> 	;	User's core memory starts at linear address 400000h
  4081                              <1> 	;	(the end of the 1st 4MB).
  4082                              <1> 	;
  4083                              <1> 	; Retro UNIX 8086 v1 modification: 
  4084                              <1> 	;	user/application segment and system/kernel segment
  4085                              <1> 	;	are different and sysenter/sysret/sysrele routines
  4086                              <1> 	;	are different (user's registers are saved to 
  4087                              <1> 	;	and then restored from system's stack.)
  4088                              <1> 	;
  4089                              <1> 	;	NOTE: Retro UNIX 8086 v1 'arg2' routine gets these
  4090                              <1> 	;	      arguments which were in these registers;
  4091                              <1> 	;	      but, it returns by putting the 1st argument
  4092                              <1> 	;	      in 'u.namep' and the 2nd argument
  4093                              <1> 	;	      on top of stack. (1st argument is offset of the
  4094                              <1> 	;	      file/path name in the user's program segment.)		 	
  4095                              <1> 	
  4096                              <1> 	;call	arg2
  4097                              <1> 	; * name - 'u.namep' points to address of file/path name
  4098                              <1> 	;          in the user's program segment ('u.segmnt')
  4099                              <1> 	;          with offset in BX register (as sysopen argument 1).
  4100                              <1> 	; * argp - sysexec argument 2 is in CX register 
  4101                              <1> 	;          which is on top of stack.
  4102                              <1> 	;
  4103                              <1> 		; jsr r0,arg2 / arg0 in u.namep,arg1 on top of stack
  4104                              <1> 
  4105                              <1> 	; 23/06/2015 (32 bit modifications)
  4106                              <1> 
  4107                              <1> 	;; 13/11/2017
  4108                              <1> 	;;mov	[u.namep], ebx ; argument 1
  4109                              <1>         ; 18/10/2015
  4110 0000DB24 890D[4C040300]      <1> 	mov     [argv], ecx  ; * ; argument 2
  4111                              <1> 
  4112                              <1> 	; 13/11/2017
  4113 0000DB2A 89DE                <1> 	mov	esi, ebx
  4114 0000DB2C E84E210000          <1> 	call	set_working_path_x
  4115 0000DB31 7319                <1> 	jnc	short sysexec_0
  4116                              <1> 
  4117                              <1> 	;; 'bad command or file name'
  4118                              <1> 	;mov	eax, ERR_BAD_CMD_ARG ; 01h ; TRDOS 8086
  4119                              <1> 	
  4120                              <1> 	; 'file not found !' error
  4121 0000DB33 B802000000          <1> 	mov	eax, ERR_NOT_FOUND ; 02h ; TRDOS 8086
  4122                              <1> sysexec_not_found_err:
  4123                              <1> sysexec_access_error:
  4124                              <1> sysexec_ext_error:
  4125 0000DB38 A3[64030300]        <1> 	mov	[u.r0], eax
  4126 0000DB3D A3[C8030300]        <1> 	mov	[u.error], eax
  4127 0000DB42 E80D220000          <1> 	call 	reset_working_path
  4128 0000DB47 E9F6EBFFFF          <1> 	jmp	error
  4129                              <1> 
  4130                              <1> sysexec_0:
  4131                              <1> 	; 13/11/2017
  4132                              <1> 	;mov	esi, FindFile_Name
  4133 0000DB4C 66B80018            <1>         mov	ax, 1800h ; Only files 
  4134 0000DB50 E892A7FFFF          <1> 	call	find_first_file
  4135 0000DB55 72E1                <1> 	jc	short sysexec_not_found_err ; eax = 2
  4136                              <1> 
  4137                              <1> 	; check_ file attributes
  4138                              <1> 	; (attribute bits = 00ADVSHR) ; 18h = Directory+Volume
  4139                              <1> 	; BL = Attributes byte
  4140                              <1> 	
  4141 0000DB57 F6C306              <1>         test	bl, 6  ; system file or hidden file (S+H) 
  4142                              <1> 	;jz	short sysexec_0ext
  4143 0000DB5A 7417                <1> 	jz	short sysexec_1 ; yes
  4144                              <1> 
  4145                              <1> 	; 13/11/2017 
  4146                              <1> 	; /// TRDOS386 permission check for multiuser mode ///
  4147                              <1> 	; SYSTEM file or HIDDEN file !!
  4148                              <1> 	; (Only super user has permission to run this file.)
  4149                              <1> 	
  4150                              <1> 	; ([u.uid]=0 for super user or root in multiuser mode)  
  4151                              <1> 	; ([u.uid]=0 for any users in singleuser mode) 
  4152 0000DB5C 803D[B0030300]00    <1> 	cmp 	byte [u.uid], 0 ; Super User ([u.uid]=0) ?
  4153                              <1> 	;jna	short sysexec_0ext
  4154 0000DB63 760E                <1> 	jna	short sysexec_1 ; yes 
  4155                              <1> 
  4156                              <1> 	; 'permission denied !' error  
  4157 0000DB65 B80B000000          <1>         mov	eax, ERR_FILE_ACCESS  ; 11 = ERR_PERM_DENIED
  4158 0000DB6A EBCC                <1>         jmp	short sysexec_access_error
  4159                              <1> 
  4160                              <1> sysexec_not_exf:
  4161                              <1> 	; 'not executable file !' error
  4162 0000DB6C B816000000          <1> 	mov	eax, ERR_NOT_EXECUTABLE
  4163 0000DB71 EBC5                <1> 	jmp	sysexec_ext_error
  4164                              <1> 
  4165                              <1> ;sysexec_0ext:
  4166                              <1> sysexec_1:
  4167                              <1> 	; 18/11/2017
  4168 0000DB73 BE[68620100]        <1> 	mov	esi, FindFile_Name
  4169                              <1> 	; 13/11/2017
  4170                              <1> 	; check program file name extension
  4171                              <1> 	; ('.PRG' for current TRDOS version)
  4172 0000DB78 E80DC2FFFF          <1> 	call	check_prg_filename_ext
  4173 0000DB7D 72ED                <1> 	jc	short sysexec_not_exf
  4174                              <1> 	
  4175                              <1> 	; 18/11/2017
  4176 0000DB7F 3C50                <1> 	cmp	al, 'P'
  4177 0000DB81 75E9                <1> 	jne	short sysexec_not_exf	
  4178                              <1> 
  4179                              <1> 	; '.PRG' extension is OK.
  4180                              <1> 	; Only '.PRG' files are valid program files
  4181                              <1> 	; for current TRDOS 386 version.
  4182                              <1> 
  4183 0000DB83 8B15[94620100]      <1> 	mov	edx, [FindFile_DirEntry+DirEntry_FileSize]
  4184 0000DB89 66A1[8C620100]      <1> 	mov	ax, [FindFile_DirEntry+DirEntry_FstClusHI]
  4185 0000DB8F C1E010              <1> 	shl	eax, 16
  4186 0000DB92 66A1[92620100]      <1> 	mov	ax, [FindFile_DirEntry+DirEntry_FstClusLO]
  4187                              <1> 	; EAX = First Cluster number
  4188                              <1> 	; EDX = File Size
  4189                              <1> 
  4190 0000DB98 A3[51040300]        <1> 	mov	[ii], eax
  4191 0000DB9D 8915[55040300]      <1> 	mov	[i.size], edx
  4192                              <1> 
  4193                              <1> ;sysexec_1:
  4194                              <1> 	; 13/11/2017 - TRDOS 386 (TRDOS v2.0)
  4195                              <1> 	; 24/06/2015 - 23/10/2015 (Retro UNIX 386 v1)
  4196                              <1>         ; Moving arguments to the end of [u.upage]
  4197                              <1> 	; (by regarding page borders in user's memory space)
  4198                              <1> 	;
  4199                              <1> 	; 10/10/2015
  4200                              <1> 	; 21/07/2015
  4201 0000DBA3 89E5                <1> 	mov	ebp, esp ; (**)
  4202                              <1> 	; 18/10/2015
  4203 0000DBA5 89EF                <1> 	mov 	edi, ebp
  4204 0000DBA7 B900010000          <1> 	mov 	ecx, MAX_ARG_LEN ; 256
  4205                              <1> 	;sub	edi, MAX_ARG_LEN ; 256
  4206 0000DBAC 29CF                <1> 	sub	edi, ecx
  4207 0000DBAE 89FC                <1> 	mov	esp, edi ; *!*
  4208 0000DBB0 31C0                <1> 	xor	eax, eax
  4209 0000DBB2 A3[8C030300]        <1> 	mov 	[u.nread], eax ; 0
  4210 0000DBB7 66A3[4A040300]      <1> 	mov	[argc], ax ; 0 ; 13/11/2017
  4211 0000DBBD 49                  <1> 	dec	ecx ; 256 - 1
  4212 0000DBBE 890D[88030300]      <1> 	mov 	[u.count], ecx ; MAX_ARG_LEN - 1 ; 255
  4213                              <1> 	;mov 	dword [u.count], MAX_ARG_LEN - 1 ; 255
  4214                              <1> sysexec_2:
  4215 0000DBC4 8B35[4C040300]      <1> 	mov	esi, [argv] ; 18/10/2015 
  4216 0000DBCA E866000000          <1> 	call	get_argp
  4217 0000DBCF B904000000          <1> 	mov	ecx, 4 ; mov ecx, 4
  4218                              <1> sysexec_3:
  4219 0000DBD4 21C0                <1> 	and	eax, eax
  4220 0000DBD6 0F8429050000        <1>         jz      sysexec_6
  4221                              <1> 	; 18/10/2015
  4222 0000DBDC 010D[4C040300]      <1> 	add	[argv], ecx ; 4
  4223 0000DBE2 66FF05[4A040300]    <1> 	inc	word [argc]
  4224                              <1> 	;
  4225 0000DBE9 A3[84030300]        <1> 	mov	[u.base], eax
  4226                              <1>  	; 23/10/2015
  4227 0000DBEE 66C705[C4030300]00- <1> 	mov	word [u.pcount], 0
  4227 0000DBF6 00                  <1>
  4228                              <1> sysexec_4:
  4229 0000DBF7 E8A10B0000          <1> 	call	cpass ; get a character from user's core memory
  4230 0000DBFC 750E                <1>         jnz	short sysexec_5
  4231                              <1> 		; (max. 255 chars + null)
  4232                              <1> 	; 18/10/2015
  4233 0000DBFE 28C0                <1> 	sub 	al, al
  4234 0000DC00 AA                  <1> 	stosb
  4235 0000DC01 FF05[8C030300]      <1> 	inc	dword [u.nread]
  4236 0000DC07 E9F9040000          <1> 	jmp	sysexec_6 ; 24/04/2016
  4237                              <1> sysexec_5:
  4238 0000DC0C AA                  <1> 	stosb
  4239 0000DC0D 20C0                <1> 	and 	al, al
  4240 0000DC0F 75E6                <1> 	jnz	short sysexec_4
  4241 0000DC11 B904000000          <1> 	mov	ecx, 4
  4242 0000DC16 390D[48040300]      <1> 	cmp	[ncount], ecx ; 4
  4243 0000DC1C 72A6                <1> 	jb	short sysexec_2
  4244 0000DC1E 8B35[44040300]      <1> 	mov	esi, [nbase]
  4245 0000DC24 010D[44040300]      <1> 	add	[nbase], ecx ; 4	
  4246 0000DC2A 66290D[48040300]    <1> 	sub	[ncount], cx 
  4247 0000DC31 8B06                <1> 	mov	eax, [esi]
  4248 0000DC33 EB9F                <1> 	jmp	short sysexec_3
  4249                              <1> 
  4250                              <1> get_argp:
  4251                              <1> 	; 14/11/2017 - TRDOS 386 (TRDOS v2.0)
  4252                              <1> 	; 18/10/2015 (nbase, ncount)
  4253                              <1> 	; 21/07/2015
  4254                              <1> 	; 24/06/2015 (Retro UNIX 386 v1)
  4255                              <1> 	; Get (virtual) address of argument from user's core memory
  4256                              <1> 	;
  4257                              <1> 	; INPUT:
  4258                              <1> 	;	esi = virtual address of argument pointer
  4259                              <1> 	; OUTPUT:
  4260                              <1> 	;	eax = virtual address of argument
  4261                              <1> 	;
  4262                              <1> 	; Modified registers: EAX, EBX, ECX, EDX, ESI 
  4263                              <1> 	;
  4264 0000DC35 833D[BC030300]00    <1>  	cmp     dword [u.ppgdir], 0 ; /etc/init ?
  4265                              <1> 				    ; (the caller is kernel)
  4266 0000DC3C 7667                <1>         jna     short get_argpk 
  4267                              <1> 	;
  4268 0000DC3E 89F3                <1>      	mov	ebx, esi
  4269 0000DC40 E8A776FFFF          <1> 	call	get_physical_addr ; get physical address
  4270 0000DC45 0F8289000000        <1>         jc      get_argp_err
  4271 0000DC4B A3[44040300]        <1> 	mov 	[nbase], eax ; physical address	
  4272 0000DC50 66890D[48040300]    <1> 	mov	[ncount], cx ; remain byte count in page (1-4096)
  4273 0000DC57 B804000000          <1> 	mov	eax, 4 ; 21/07/2015
  4274 0000DC5C 6639C1              <1> 	cmp	cx, ax ; 4
  4275 0000DC5F 735D                <1> 	jnb	short get_argp2
  4276 0000DC61 89F3                <1> 	mov	ebx, esi
  4277 0000DC63 01CB                <1> 	add	ebx, ecx
  4278 0000DC65 E88276FFFF          <1> 	call	get_physical_addr ; get physical address
  4279 0000DC6A 7268                <1> 	jc	short get_argp_err
  4280                              <1> 	;push	esi
  4281 0000DC6C 89C6                <1> 	mov	esi, eax
  4282 0000DC6E 66870D[48040300]    <1> 	xchg	cx, [ncount]
  4283 0000DC75 8735[44040300]      <1> 	xchg	esi, [nbase]
  4284 0000DC7B B504                <1> 	mov	ch, 4
  4285 0000DC7D 28CD                <1> 	sub	ch, cl
  4286                              <1> get_argp0:
  4287 0000DC7F AC                  <1> 	lodsb
  4288 0000DC80 6650                <1> 	push	ax
  4289 0000DC82 FEC9                <1> 	dec	cl
  4290 0000DC84 75F9                <1>         jnz     short get_argp0
  4291 0000DC86 8B35[44040300]      <1> 	mov	esi, [nbase]
  4292                              <1> 	; 21/07/2015
  4293 0000DC8C 0FB6C5              <1> 	movzx	eax, ch
  4294 0000DC8F 0105[44040300]      <1> 	add	[nbase], eax
  4295 0000DC95 662905[48040300]    <1> 	sub	[ncount], ax
  4296                              <1> get_argp1:
  4297 0000DC9C AC                  <1> 	lodsb
  4298 0000DC9D FECD                <1> 	dec	ch
  4299 0000DC9F 7447                <1>         jz      short get_argp3
  4300 0000DCA1 6650                <1>         push	ax
  4301 0000DCA3 EBF7                <1> 	jmp     short get_argp1
  4302                              <1> get_argpk:
  4303                              <1> 	; Argument is in kernel's memory space
  4304 0000DCA5 66C705[48040300]00- <1> 	mov	word [ncount], PAGE_SIZE ; 4096
  4304 0000DCAD 10                  <1>
  4305 0000DCAE 8935[44040300]      <1> 	mov	[nbase], esi
  4306 0000DCB4 8305[44040300]04    <1> 	add	dword [nbase], 4
  4307 0000DCBB 8B06                <1> 	mov	eax, [esi] ; virtual addr. = physcal addr.
  4308 0000DCBD C3                  <1> 	retn
  4309                              <1> get_argp2:
  4310                              <1> 	; 21/07/2015
  4311                              <1> 	;mov	eax, 4
  4312 0000DCBE 8B15[44040300]      <1> 	mov 	edx, [nbase] ; 18/10/2015
  4313 0000DCC4 0105[44040300]      <1> 	add	[nbase], eax
  4314 0000DCCA 662905[48040300]    <1> 	sub	[ncount], ax
  4315                              <1> 	;
  4316 0000DCD1 8B02                <1> 	mov	eax, [edx]
  4317 0000DCD3 C3                  <1> 	retn
  4318                              <1> get_argp_err:
  4319 0000DCD4 A3[C8030300]        <1> 	mov	[u.error], eax
  4320                              <1> 	; 14/11/2017
  4321 0000DCD9 B801000000          <1> 	mov	eax, ERR_BAD_CMD_ARG ; 01h ; TRDOS 8086
  4322 0000DCDE A3[64030300]        <1> 	mov	[u.r0], eax
  4323 0000DCE3 E95AEAFFFF          <1> 	jmp	error
  4324                              <1> get_argp3:
  4325 0000DCE8 B103                <1> 	mov	cl, 3
  4326                              <1> get_argp4:
  4327 0000DCEA C1E008              <1> 	shl	eax, 8
  4328 0000DCED 665A                <1> 	pop	dx
  4329 0000DCEF 88D0                <1> 	mov 	al, dl
  4330 0000DCF1 E2F7                <1>         loop    get_argp4
  4331                              <1> 	;pop	esi
  4332 0000DCF3 C3                  <1> 	retn	
  4333                              <1> 
  4334                              <1> sysstat: 
  4335                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  4336                              <1> 	; temporary !
  4337 0000DCF4 B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  4338 0000DCF9 A3[C8030300]        <1>         mov     [u.error], eax
  4339 0000DCFE A3[64030300]        <1>         mov     [u.r0], eax 
  4340 0000DD03 E93AEAFFFF          <1> 	jmp	error
  4341                              <1> 
  4342                              <1> sysfstat: 
  4343                              <1> 	; 13/01/2017 - TRDOS 386 (TRDOS v2.0)
  4344                              <1> 	; temporary !
  4345 0000DD08 B801000000          <1> 	mov	eax, ERR_INV_FNUMBER ; 'invalid function number !'
  4346 0000DD0D A3[C8030300]        <1>         mov     [u.error], eax
  4347 0000DD12 A3[64030300]        <1>         mov     [u.r0], eax 
  4348 0000DD17 E926EAFFFF          <1> 	jmp	error
  4349                              <1> 
  4350                              <1> fclose:
  4351                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0)
  4352                              <1> 	;
  4353                              <1> 	; 18/06/2015 (Retro UNIX 386 v1 - Beginning)
  4354                              <1> 	;            (32 bit offset pointer modification)
  4355                              <1> 	; 19/04/2013 - 12/01/2014 (Retro UNIX 8086 v1)
  4356                              <1> 	;
  4357                              <1> 	; Given the file descriptor (index to the u.fp list)
  4358                              <1> 	; 'fclose' first gets the i-number of the file via 'getf'.
  4359                              <1> 	; If i-node is active (i-number > 0) the entry in 
  4360                              <1> 	; u.fp list is cleared. If all the processes that opened
  4361                              <1> 	; that file close it, then fsp etry is freed and the file
  4362                              <1> 	; is closed. If not a return is taken. 
  4363                              <1> 	; If the file has been deleted while open, 'anyi' is called
  4364                              <1> 	; to see anyone else has it open, i.e., see if it is appears
  4365                              <1> 	; in another entry in the fsp table. Upon return from 'anyi'
  4366                              <1> 	; a check is made to see if the file is special.	
  4367                              <1> 	;
  4368                              <1> 	; INPUTS ->
  4369                              <1> 	;    r1 - contains the file descriptor (value=0,1,2...)
  4370                              <1> 	;    u.fp - list of entries in the fsp table
  4371                              <1> 	;    fsp - table of entries (4 words/entry) of open files.	 
  4372                              <1> 	; OUTPUTS ->
  4373                              <1> 	;    r1 - contains the same file descriptor
  4374                              <1> 	;    r2 - contains i-number
  4375                              <1> 	;
  4376                              <1> 	; ((AX = R1))
  4377                              <1> 	; ((Modified registers: eDX, eBX, eCX, eSI, eDI, eBP))
  4378                              <1> 	;
  4379                              <1> 	; Retro UNIX 8086 v1 modification : CF = 1
  4380                              <1> 	;              if i-number of the file is 0. (error)  	
  4381                              <1> 	;
  4382                              <1> 	; TRDOS 386 (06/10/2016)
  4383                              <1> 	; 
  4384                              <1> 	; INPUT:
  4385                              <1> 	;	EAX = File Handle (File Descriptor, File Index)
  4386                              <1> 	;
  4387                              <1> 	; OUTPUT:
  4388                              <1> 	;	CF = 1 -> File not open !
  4389                              <1> 	;	CF = 0 -> OK!
  4390                              <1> 	;	     EBX = File Number (System)
  4391                              <1> 	;	     [cdev] = Logical DOS Drive Number
  4392                              <1> 	;	     EAX = File Handle/Number (user) 	
  4393                              <1> 	;
  4394                              <1> 	; Modified Registers: EBX
  4395                              <1> 
  4396 0000DD1C 50                  <1> 	push	eax ; File handle
  4397                              <1> 	
  4398 0000DD1D E846000000          <1> 	call	getf
  4399 0000DD22 0F8205240000        <1> 	jc	device_close ; eax = device number
  4400                              <1> 
  4401 0000DD28 80BB[E6680100]01    <1> 	cmp	byte [ebx+OF_MODE], 1 ; open mode ; 0 = empty entry
  4402 0000DD2F 722E                <1> 	jb	short fclose_1	      ; 1 = read, 2 = write
  4403                              <1> 	
  4404 0000DD31 83F801              <1> 	cmp	eax, 1 ; is the first cluster number > 0
  4405 0000DD34 7229                <1> 	jb	short fclose_1 ; no, this is empty entry
  4406                              <1> 
  4407                              <1> fclose_0:
  4408 0000DD36 FE8B[FA680100]      <1> 	dec	byte [ebx+OF_OPENCOUNT] ; decrement the number of processes 
  4409                              <1> 			                ; that have opened the file
  4410 0000DD3C 7921                <1> 	jns	short fclose_1 ; jump if not negative (jump if bit 7 is 0)	 
  4411                              <1> 			; if all processes haven't closed the file, return
  4412                              <1> 	;
  4413                              <1> 	; eax ; First cluster
  4414 0000DD3E 31C0                <1> 	xor	eax, eax ; 0
  4415 0000DD40 8883[E6680100]      <1> 	mov	[ebx+OF_MODE], al ; 0 = empty entry
  4416                              <1> 	;mov	[ebx+OF_STATUS], al ; 0 = empty entry
  4417 0000DD46 66C1E302            <1> 	shl	bx, 2 
  4418 0000DD4A 8983[B4680100]      <1> 	mov	[ebx+OF_FCLUSTER], eax ; 0
  4419 0000DD50 8983[CC690100]      <1> 	mov	[ebx+OF_CCLUSTER], eax ; 0
  4420                              <1> 	;mov	[ebx+OF_CCINDEX], eax ; 0
  4421 0000DD56 A3[74030300]        <1> 	mov	[u.fofp], eax ; 0
  4422 0000DD5B 66C1EB02            <1> 	shr	bx, 2
  4423                              <1> fclose_1: ; 1:
  4424 0000DD5F 58                  <1> 	pop	eax ; File handle (File Descriptor, File Index)
  4425 0000DD60 C680[6A030300]00    <1> 	mov	byte [eax+u.fp], 0 ; clear that entry in the u.fp list
  4426 0000DD67 C3                  <1> 	retn
  4427                              <1> 
  4428                              <1> getf:
  4429                              <1> 	; 12/10/2016
  4430                              <1> 	; 11/10/2016
  4431                              <1> 	; 08/10/2016
  4432                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0)
  4433                              <1> 	; / get the device number and the i-number of an open file
  4434                              <1> 	; 13/05/2015
  4435                              <1> 	; 11/05/2015 (Retro UNIX 386 v1 - Beginning)
  4436                              <1> 	; 19/04/2013 - 18/11/2013 (Retro UNIX 8086 v1)
  4437                              <1> 	;
  4438 0000DD68 89C3                <1> 	mov	ebx, eax
  4439                              <1> getf1: 
  4440 0000DD6A 83FB0A              <1> 	cmp	ebx, 10
  4441 0000DD6D 730A                <1>         jnb	short getf2
  4442 0000DD6F 8A9B[6A030300]      <1> 	mov	bl, [ebx+u.fp]
  4443 0000DD75 08DB                <1> 	or	bl, bl
  4444 0000DD77 7503                <1> 	jnz	short getf3
  4445                              <1> getf2:
  4446                              <1> 	; 'File not open !' error (ax=0)
  4447 0000DD79 29C0                <1> 	sub	eax, eax
  4448 0000DD7B C3                  <1> 	retn
  4449                              <1> getf3:	
  4450 0000DD7C F6C380              <1> 	test	bl, 80h
  4451 0000DD7F 7530                <1> 	jnz	short getf5 ; device
  4452 0000DD81 FECB                <1> 	dec	bl ; 0 based
  4453 0000DD83 8A83[DC680100]      <1> 	mov	al, [ebx+OF_DRIVE]
  4454 0000DD89 A2[46030300]        <1> 	mov	[cdev], al
  4455 0000DD8E C0E302              <1> 	shl	bl, 2 ; *4 (dword offset)
  4456 0000DD91 8B83[2C690100]      <1> 	mov	eax, [ebx+OF_SIZE]
  4457 0000DD97 A3[55040300]        <1> 	mov	[i.size], eax ; file size
  4458 0000DD9C 8D83[04690100]      <1> 	lea	eax, [ebx+OF_POINTER] ;12/10/2016
  4459 0000DDA2 A3[74030300]        <1> 	mov	[u.fofp], eax
  4460 0000DDA7 8B83[B4680100]      <1> 	mov	eax, [ebx+OF_FCLUSTER]
  4461 0000DDAD C0EB02              <1> 	shr	bl, 2 ; /4 (byte offset) 
  4462                              <1> getf4:
  4463 0000DDB0 C3                  <1> 	retn
  4464                              <1> getf5: 
  4465                              <1> 	; get device number
  4466 0000DDB1 80E37F              <1> 	and	bl, 7Fh ; 1 to 7Fh
  4467 0000DDB4 FECB                <1> 	dec	bl ; 0 based (0 to 7Eh)
  4468 0000DDB6 8A83[0E670100]      <1> 	mov	al, [ebx+DEV_DRIVER]
  4469 0000DDBC 8AAB[78660100]      <1> 	mov	ch, [ebx+DEV_ACCESS]
  4470 0000DDC2 8A8B[2C670100]      <1> 	mov	cl, [ebx+DEV_OPENMODE]
  4471 0000DDC8 80E5FE              <1> 	and	ch, 0FEh ; reset bit 0 ; dev_close
  4472 0000DDCB F9                  <1> 	stc ; cf = 1 
  4473 0000DDCC C3                  <1> 	retn	
  4474                              <1> 
  4475                              <1> trans_addr_nmbp:
  4476                              <1> 	; 18/10/2015
  4477                              <1> 	; 12/10/2015
  4478 0000DDCD 8B2D[7C030300]      <1> 	mov 	ebp, [u.namep]
  4479                              <1> trans_addr_nm: 
  4480                              <1> 	; Convert virtual (pathname) address to physical address
  4481                              <1> 	; (Retro UNIX 386 v1 feature only !)
  4482                              <1> 	; 18/10/2015
  4483                              <1> 	; 12/10/2015 (u.pnbase & u.pncount has been removed from code)
  4484                              <1> 	; 02/07/2015
  4485                              <1> 	; 17/06/2015
  4486                              <1> 	; 16/06/2015
  4487                              <1> 	;
  4488                              <1> 	; INPUTS: 
  4489                              <1> 	;	ebp = pathname address (virtual) ; [u.namep]
  4490                              <1> 	;	[u.pgdir] = user's page directory
  4491                              <1> 	; OUTPUT:
  4492                              <1> 	;       esi = physical address of the pathname
  4493                              <1> 	;	ecx = remain byte count in the page
  4494                              <1> 	;
  4495                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX, ESI)
  4496                              <1> 	;
  4497 0000DDD3 833D[BC030300]00    <1>         cmp     dword [u.ppgdir], 0  ; /etc/init ? (sysexec)
  4498 0000DDDA 7618                <1> 	jna	short trans_addr_nmk ; the caller is os kernel;
  4499                              <1> 				     ; it is already physical address
  4500 0000DDDC 50                  <1>    	push	eax	
  4501 0000DDDD 89EB                <1> 	mov	ebx, ebp ; [u.namep] ; pathname address (virtual)
  4502 0000DDDF E80875FFFF          <1>        	call	get_physical_addr ; get physical address
  4503 0000DDE4 7204                <1> 	jc	short tr_addr_nm_err
  4504                              <1> 	; 18/10/2015
  4505                              <1> 	; eax = physical address 
  4506                              <1> 	; cx = remain byte count in page (1-4096) 
  4507                              <1> 		; 12/10/2015 (cx = [u.pncount])
  4508 0000DDE6 89C6                <1> 	mov	esi, eax ; 12/10/2015 (esi=[u.pnbase])
  4509 0000DDE8 58                  <1> 	pop	eax 
  4510 0000DDE9 C3                  <1> 	retn
  4511                              <1> 
  4512                              <1> tr_addr_nm_err:
  4513 0000DDEA A3[C8030300]        <1> 	mov	[u.error], eax
  4514                              <1> 	;pop 	eax
  4515 0000DDEF E94EE9FFFF          <1> 	jmp	error
  4516                              <1> 
  4517                              <1> trans_addr_nmk:
  4518                              <1> 	; 12/10/2015
  4519                              <1> 	; 02/07/2015
  4520 0000DDF4 8B35[7C030300]      <1> 	mov	esi, [u.namep]  ; [u.pnbase]
  4521 0000DDFA 66B90010            <1> 	mov	cx, PAGE_SIZE ; 4096 ; [u.pncount]
  4522 0000DDFE C3                  <1> 	retn
  4523                              <1> 
  4524                              <1> 
  4525                              <1> sysbreak:
  4526                              <1> 	; 18/10/2015
  4527                              <1> 	; 07/10/2015
  4528                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  4529                              <1> 	; 20/06/2013 - 24/03/2014 (Retro UNIX 8086 v1)
  4530                              <1> 	;
  4531                              <1> 	; 'sysbreak' sets the programs break points. 
  4532                              <1> 	; It checks the current break point (u.break) to see if it is
  4533                              <1> 	; between "core" and the stack (sp). If it is, it is made an
  4534                              <1> 	; even address (if it was odd) and the area between u.break
  4535                              <1> 	; and the stack is cleared. The new breakpoint is then put
  4536                              <1> 	; in u.break and control is passed to 'sysret'.
  4537                              <1> 	;
  4538                              <1> 	; Calling sequence:
  4539                              <1> 	;	sysbreak; addr
  4540                              <1> 	; Arguments: -
  4541                              <1> 	;	
  4542                              <1> 	; Inputs: u.break - current breakpoint
  4543                              <1> 	; Outputs: u.break - new breakpoint 
  4544                              <1> 	;	area between old u.break and the stack (sp) is cleared.
  4545                              <1> 	; ...............................................................
  4546                              <1> 	;	
  4547                              <1> 	; Retro UNIX 8086 v1 modification:
  4548                              <1> 	;	The user/application program puts breakpoint address
  4549                              <1> 	;       in BX register as 'sysbreak' system call argument.
  4550                              <1> 	; 	(argument transfer method 1)
  4551                              <1> 	;
  4552                              <1> 	;  NOTE: Beginning of core is 0 in Retro UNIX 8086 v1 !
  4553                              <1> 	; 	((!'sysbreak' is not needed in Retro UNIX 8086 v1!))
  4554                              <1> 	;  NOTE:
  4555                              <1> 	; 	'sysbreak' clears extended part (beyond of previous
  4556                              <1> 	;	'u.break' address) of user's memory for original unix's
  4557                              <1> 	;	'bss' compatibility with Retro UNIX 8086 v1 (19/11/2013)
  4558                              <1> 
  4559                              <1> 		; mov u.break,r1 / move users break point to r1
  4560                              <1> 		; cmp r1,$core / is it the same or lower than core?
  4561                              <1> 		; blos 1f / yes, 1f
  4562                              <1> 	; 23/06/2015
  4563 0000DDFF 8B2D[90030300]      <1> 	mov	ebp, [u.break] ; virtual address (offset)
  4564                              <1> 	;and	ebp, ebp
  4565                              <1> 	;jz	short sysbreak_3 
  4566                              <1> 	; Retro UNIX 386 v1 NOTE: u.break points to virtual address !!!
  4567                              <1> 	; (Even break point address is not needed for Retro UNIX 386 v1)
  4568 0000DE05 8B15[5C030300]      <1> 	mov	edx, [u.sp] ; kernel stack at the beginning of sys call
  4569 0000DE0B 83C20C              <1> 	add	edx, 12 ; EIP -4-> CS -4-> EFLAGS -4-> ESP (user) 
  4570                              <1> 	; 07/10/2015
  4571 0000DE0E 891D[90030300]      <1> 	mov	[u.break], ebx ; virtual address !!!
  4572                              <1> 	;
  4573 0000DE14 3B1A                <1> 	cmp	ebx, [edx] ; compare new break point with 
  4574                              <1> 			   ; with top of user's stack (virtual!)
  4575 0000DE16 7323                <1> 	jnb	short sysbreak_3
  4576                              <1> 		; cmp r1,sp / is it the same or higher 
  4577                              <1> 			  ; / than the stack?
  4578                              <1> 		; bhis 1f / yes, 1f
  4579 0000DE18 89DE                <1> 	mov	esi, ebx
  4580 0000DE1A 29EE                <1> 	sub	esi, ebp ; new break point - old break point
  4581 0000DE1C 761D                <1> 	jna	short sysbreak_3 
  4582                              <1> 	;push	ebx
  4583                              <1> sysbreak_1:
  4584 0000DE1E 89EB                <1> 	mov	ebx, ebp  
  4585 0000DE20 E8C774FFFF          <1> 	call	get_physical_addr ; get physical address
  4586 0000DE25 72C3                <1> 	jc	tr_addr_nm_err
  4587                              <1> 	; 18/10/2015
  4588 0000DE27 89C7                <1> 	mov	edi, eax 
  4589 0000DE29 29C0                <1> 	sub	eax, eax ; 0
  4590                              <1> 		 ; ECX = remain byte count in page (1-4096)
  4591 0000DE2B 39CE                <1> 	cmp	esi, ecx
  4592 0000DE2D 7302                <1> 	jnb	short sysbreak_2
  4593 0000DE2F 89F1                <1> 	mov	ecx, esi
  4594                              <1> sysbreak_2:
  4595 0000DE31 29CE                <1> 	sub	esi, ecx
  4596 0000DE33 01CD                <1> 	add	ebp, ecx
  4597 0000DE35 F3AA                <1> 	rep 	stosb
  4598 0000DE37 09F6                <1> 	or	esi, esi
  4599 0000DE39 75E3                <1> 	jnz	short sysbreak_1
  4600                              <1> 	;
  4601                              <1> 		; bit $1,r1 / is it an odd address
  4602                              <1> 		; beq 2f / no, its even
  4603                              <1> 		; clrb (r1)+ / yes, make it even
  4604                              <1> 	; 2: / clear area between the break point and the stack
  4605                              <1> 		; cmp r1,sp / is it higher or same than the stack
  4606                              <1> 		; bhis 1f / yes, quit
  4607                              <1> 		; clr (r1)+ / clear word
  4608                              <1> 		; br 2b / go back
  4609                              <1> 	;pop	ebx
  4610                              <1> sysbreak_3: ; 1:
  4611                              <1> 	;mov	[u.break], ebx ; virtual address !!!
  4612                              <1> 		; jsr r0,arg; u.break / put the "address" 
  4613                              <1> 			; / in u.break (set new break point)
  4614                              <1> 		; br sysret4 / br sysret
  4615 0000DE3B E922E9FFFF          <1> 	jmp	sysret
  4616                              <1> 
  4617                              <1> sysseek: ; / moves read write pointer in an fsp entry
  4618                              <1> 	; 06/11/2016 - TRDOS 386 (TRDOS v2.0)
  4619                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  4620                              <1> 	; 07/07/2013 - 05/08/2013 (Retro UNIX 8086 v1)
  4621                              <1> 	;
  4622                              <1> 	; 'sysseek' changes the r/w pointer of (3rd word of in an
  4623                              <1> 	; fsp entry) of an open file whose file descriptor is in u.r0.
  4624                              <1> 	; The file descriptor refers to a file open for reading or
  4625                              <1> 	; writing. The read (or write) pointer is set as follows:
  4626                              <1> 	;	* if 'ptrname' is 0, the pointer is set to offset.
  4627                              <1> 	;	* if 'ptrname' is 1, the pointer is set to its
  4628                              <1> 	;	  current location plus offset.
  4629                              <1> 	;	* if 'ptrname' is 2, the pointer is set to the
  4630                              <1> 	;	  size of file plus offset.
  4631                              <1> 	; The error bit (e-bit) is set for an undefined descriptor.
  4632                              <1> 	;
  4633                              <1> 	; Calling sequence:
  4634                              <1> 	;	sysseek; offset; ptrname
  4635                              <1> 	; Arguments:
  4636                              <1> 	;	offset - number of bytes desired to move 
  4637                              <1> 	;		 the r/w pointer
  4638                              <1> 	;	ptrname - a switch indicated above
  4639                              <1> 	;
  4640                              <1> 	; Inputs: r0 - file descriptor 
  4641                              <1> 	; Outputs: -
  4642                              <1> 	; ...............................................................
  4643                              <1> 	;	
  4644                              <1> 	; Retro UNIX 8086 v1 modification: 
  4645                              <1> 	;       'sysseek' system call has three arguments; so,
  4646                              <1> 	;	* 1st argument, file descriptor is in BX (BL) register
  4647                              <1> 	;	* 2nd argument, offset is in CX register
  4648                              <1> 	;	* 3rd argument, ptrname/switch is in DX (DL) register	
  4649                              <1> 
  4650 0000DE40 E821000000          <1> 	call	seektell
  4651                              <1> 	; EAX = Current R/W pointer of the file
  4652                              <1> 	; EBX = [u.fofp]
  4653                              <1> 	; [u.base] = offset (ECX input)
  4654                              <1> 
  4655 0000DE45 0305[84030300]      <1> 	add	eax, [u.base]
  4656 0000DE4B 8903                <1> 	mov	[ebx], eax
  4657 0000DE4D E910E9FFFF          <1> 	jmp	sysret
  4658                              <1> 
  4659                              <1> systell: ; / get the r/w pointer
  4660                              <1> 	; 06/11/2016 - TRDOS 386 (TRDOS v2.0) - temporary !-
  4661                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  4662                              <1> 	; 07/07/2013 - 05/08/2013 (Retro UNIX 8086 v1)
  4663                              <1> 	;
  4664                              <1> 	; Retro UNIX 8086 v1 modification:
  4665                              <1> 	; ! 'systell' does not work in original UNIX v1,
  4666                              <1> 	; 	    it returns with error !
  4667                              <1> 	; Inputs: r0 - file descriptor 
  4668                              <1> 	; Outputs: r0 - file r/w pointer
  4669                              <1> 
  4670                              <1> 	;xor	ecx, ecx ; 0
  4671 0000DE52 BA01000000          <1> 	mov	edx, 1 ; 05/08/2013
  4672                              <1> 	;call 	seektell
  4673 0000DE57 E810000000          <1> 	call 	seektell0 ; 05/08/2013
  4674                              <1> 	;; 06/11/2016
  4675                              <1> 	;; mov	eax, [ebx]
  4676 0000DE5C A3[64030300]        <1> 	mov	[u.r0], eax
  4677 0000DE61 E9FCE8FFFF          <1> 	jmp	sysret
  4678                              <1> 
  4679                              <1> ; Original unix v1 'systell' system call:
  4680                              <1> 		; jsr r0,seektell
  4681                              <1> 		; br error4
  4682                              <1> 
  4683                              <1> seektell:
  4684                              <1> 	; 06/11/2016 - TRDOS 386 (TRDOS v2.0)
  4685                              <1> 	; 03/01/2016
  4686                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  4687                              <1> 	; 07/07/2013 - 05/08/2013 (Retro UNIX 8086 v1)
  4688                              <1> 	;
  4689                              <1> 	; 'seektell' puts the arguments from sysseek and systell
  4690                              <1> 	; call in u.base and u.count. It then gets the i-number of
  4691                              <1> 	; the file from the file descriptor in u.r0 and by calling
  4692                              <1> 	; getf. The i-node is brought into core and then u.count
  4693                              <1> 	; is checked to see it is a 0, 1, or 2.
  4694                              <1> 	; If it is 0 - u.count stays the same
  4695                              <1> 	;          1 - u.count = offset (u.fofp)
  4696                              <1> 	;	   2 - u.count = i.size (size of file)
  4697                              <1> 	; 	 		
  4698                              <1> 	; !! Retro UNIX 8086 v1 modification:
  4699                              <1> 	;	Argument 1, file descriptor is in BX;
  4700                              <1> 	;	Argument 2, offset is in CX;
  4701                              <1> 	;	Argument 3, ptrname/switch is in DX register.	
  4702                              <1> 	;
  4703                              <1> 	; ((Return -> eax = base for offset (position= base+offset))
  4704                              <1> 	;
  4705 0000DE66 890D[84030300]      <1> 	mov 	[u.base], ecx ; offset
  4706                              <1> seektell0:
  4707 0000DE6C 8915[88030300]      <1> 	mov 	[u.count], edx
  4708                              <1> 	; EBX = file descriptor (file number)
  4709 0000DE72 E8F3FEFFFF          <1> 	call	getf1
  4710                              <1> 	; EAX = First cluster of the file
  4711                              <1> 	; EBX = File number (Open file number)
  4712                              <1> 	; [u.fofp] = Pointer to File pointer
  4713                              <1> 	; [i.size] = File size
  4714                              <1> 
  4715 0000DE77 09C0                <1> 	or	eax, eax
  4716 0000DE79 7514                <1> 	jnz	short seektell1
  4717                              <1> 
  4718 0000DE7B B80A000000          <1> 	mov	eax, ERR_FILE_NOT_OPEN
  4719 0000DE80 A3[64030300]        <1> 	mov	[u.r0], eax 
  4720 0000DE85 A3[C8030300]        <1> 	mov	dword [u.error], eax ; 'file not open !'
  4721 0000DE8A E9B3E8FFFF          <1> 	jmp	error
  4722                              <1> 
  4723                              <1> seektell1:
  4724 0000DE8F 8B1D[74030300]      <1>         mov     ebx, [u.fofp]
  4725 0000DE95 803D[88030300]01    <1> 	cmp	byte [u.count], 1
  4726 0000DE9C 7705                <1> 	ja	short seektell2
  4727 0000DE9E 7409                <1> 	je	short seektell3
  4728 0000DEA0 31C0                <1> 	xor	eax, eax
  4729 0000DEA2 C3                  <1> 	retn
  4730                              <1> 
  4731                              <1> seektell2:
  4732 0000DEA3 A1[55040300]        <1>         mov   	eax, [i.size]
  4733 0000DEA8 C3                  <1> 	retn
  4734                              <1> 
  4735                              <1> seektell3:
  4736 0000DEA9 8B03                <1> 	mov	eax, [ebx]
  4737 0000DEAB C3                  <1> 	retn
  4738                              <1> 
  4739                              <1> sysintr: ; / set interrupt handling
  4740                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  4741                              <1> 	; 07/07/2013 (Retro UNIX 8086 v1)
  4742                              <1> 	;
  4743                              <1> 	; 'sysintr' sets the interrupt handling value. It puts
  4744                              <1> 	; argument of its call in u.intr then branches into 'sysquit'
  4745                              <1> 	; routine. u.tty is checked if to see if a control tty exists.
  4746                              <1> 	; If one does the interrupt character in the tty buffer is
  4747                              <1> 	; cleared and 'sysret'is called. If one does not exits
  4748                              <1> 	; 'sysret' is just called.	
  4749                              <1> 	;
  4750                              <1> 	; Calling sequence:
  4751                              <1> 	;	sysintr; arg
  4752                              <1> 	; Argument:
  4753                              <1> 	;	arg - if 0, interrupts (ASCII DELETE) are ignored.
  4754                              <1> 	;	    - if 1, intterupts cause their normal result
  4755                              <1> 	;		 i.e force an exit.
  4756                              <1> 	;	    - if arg is a location within the program,
  4757                              <1> 	;		control is passed to that location when
  4758                              <1> 	;		an interrupt occurs.	
  4759                              <1> 	; Inputs: -
  4760                              <1> 	; Outputs: -
  4761                              <1> 	; ...............................................................
  4762                              <1> 	;	
  4763                              <1> 	; Retro UNIX 8086 v1 modification: 
  4764                              <1> 	;       'sysintr' system call sets u.intr to value of BX
  4765                              <1> 	;	then branches into sysquit.
  4766                              <1> 	;
  4767 0000DEAC 66891D[AA030300]    <1> 	mov	[u.intr], bx
  4768                              <1> 		; jsr r0,arg; u.intr / put the argument in u.intr
  4769                              <1> 		; br 1f / go into quit routine
  4770 0000DEB3 E9AAE8FFFF          <1> 	jmp	sysret
  4771                              <1> 
  4772                              <1> sysquit:
  4773                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  4774                              <1> 	; 07/07/2013 (Retro UNIX 8086 v1)
  4775                              <1> 	;
  4776                              <1> 	; 'sysquit' turns off the quit signal. it puts the argument of
  4777                              <1> 	; the call in u.quit. u.tty is checked if to see if a control 
  4778                              <1> 	; tty exists. If one does the interrupt character in the tty
  4779                              <1> 	; buffer is cleared and 'sysret'is called. If one does not exits
  4780                              <1> 	; 'sysret' is just called.	
  4781                              <1> 	;
  4782                              <1> 	; Calling sequence:
  4783                              <1> 	;	sysquit; arg
  4784                              <1> 	; Argument:
  4785                              <1> 	;	arg - if 0, this call diables quit signals from the
  4786                              <1> 	;		typewriter (ASCII FS)
  4787                              <1> 	;	    - if 1, quits are re-enabled and cause execution to
  4788                              <1> 	;		cease and a core image to be produced.
  4789                              <1> 	;		 i.e force an exit.
  4790                              <1> 	;	    - if arg is an addres in the program,
  4791                              <1> 	;		a quit causes control to sent to that
  4792                              <1> 	;		location.	
  4793                              <1> 	; Inputs: -
  4794                              <1> 	; Outputs: -
  4795                              <1> 	; ...............................................................
  4796                              <1> 	;	
  4797                              <1> 	; Retro UNIX 8086 v1 modification: 
  4798                              <1> 	;       'sysquit' system call sets u.quit to value of BX
  4799                              <1> 	;	then branches into 'sysret'.
  4800                              <1> 	;
  4801 0000DEB8 66891D[AC030300]    <1> 	mov	[u.quit], bx
  4802 0000DEBF E99EE8FFFF          <1> 	jmp	sysret
  4803                              <1> 		; jsr r0,arg; u.quit / put argument in u.quit
  4804                              <1> 	;1:
  4805                              <1> 		; mov u.ttyp,r1 / move pointer to control tty buffer
  4806                              <1> 			      ; / to r1
  4807                              <1> 		; beq sysret4 / return to user
  4808                              <1> 		; clrb 6(r1) / clear the interrupt character 
  4809                              <1> 			   ; / in the tty buffer
  4810                              <1> 		; br sysret4 / return to user
  4811                              <1> 
  4812                              <1> anyi: 
  4813                              <1> 	; 06/10/2016 (TRDOS 386 = TRDOS v2.0)
  4814                              <1> 	; Major Modification!
  4815                              <1> 	; TRDOS 386 does not permit to delete a file while it is open 
  4816                              <1> 	; The role of 'anyi' procedure has beeen changed to ensure that.
  4817                              <1> 	; 	
  4818                              <1> 	; 22/06/2015 (Retro UNIX 386 v1 - Beginning)
  4819                              <1> 	; 25/04/2013 (Retro UNIX 8086 v1)
  4820                              <1> 	;
  4821                              <1> 	; 'anyi' is called if a file deleted while open.
  4822                              <1> 	; "anyi" checks to see if someone else has opened this file.
  4823                              <1> 	;
  4824                              <1> 	; INPUTS ->
  4825                              <1> 	;    r1 - contains an i-number
  4826                              <1> 	;    fsp - start of table containing open files
  4827                              <1> 	;
  4828                              <1> 	; OUTPUTS ->
  4829                              <1> 	;    "deleted" flag set in fsp entry of another occurrence of
  4830                              <1> 	;	   this file and r2 points 1st word of this fsp entry.
  4831                              <1> 	;    if file not found - bit in i-node map is cleared
  4832                              <1> 	;    			 (i-node is freed)
  4833                              <1> 	;               all blocks related to i-node are freed
  4834                              <1> 	;	        all flags in i-node are cleared
  4835                              <1> 	; ((AX = R1)) input
  4836                              <1> 	;
  4837                              <1> 	;    (Retro UNIX Prototype : 02/12/2012, UNIXCOPY.ASM)
  4838                              <1>         ;    ((Modified registers: eDX, eCX, eBX, eSI, eDI, eBP))  
  4839                              <1> 	;
  4840                              <1> 	; / r1 contains an i-number
  4841                              <1> 
  4842                              <1> 	; TRDOS 386 (06/10/2016)
  4843                              <1> 	; 
  4844                              <1> 	; INPUT:
  4845                              <1> 	;	EAX = First Cluster
  4846                              <1> 	;	 DL = Logical DOS Drive Number
  4847                              <1> 	;
  4848                              <1> 	; OUTPUT:
  4849                              <1> 	;	CF = 1 -> EBX = File Handle/Number/Index
  4850                              <1> 	;	CF = 0 -> EBX = 0
  4851                              <1> 	;
  4852                              <1> 	; Modified Registers: EBX
  4853                              <1> 
  4854 0000DEC4 31DB                <1> 	xor	ebx, ebx
  4855                              <1> anyi_0: 
  4856 0000DEC6 80BB[E6680100]00    <1> 	cmp	byte [ebx+OF_MODE], 0 ; 0 = empty entry
  4857 0000DECD 770A                <1> 	ja	short anyi_2 ; 1 (r), 2 (w) or 3 (r&w)
  4858                              <1> anyi_1:
  4859 0000DECF FEC3                <1> 	inc	bl
  4860 0000DED1 80FB0A              <1> 	cmp	bl, OPENFILES ; max. count of open files
  4861 0000DED4 72F0                <1> 	jb	short anyi_0
  4862 0000DED6 31C0                <1> 	xor	eax, eax
  4863 0000DED8 C3                  <1> 	retn 
  4864                              <1> anyi_2:
  4865 0000DED9 3A93[DC680100]      <1> 	cmp	dl, [ebx+OF_DRIVE]
  4866 0000DEDF 75EE                <1> 	jne	short anyi_1
  4867 0000DEE1 66C1E302            <1> 	shl	bx, 2 ; *4 (dword offset)
  4868 0000DEE5 3B83[B4680100]      <1> 	cmp	eax, [ebx+OF_FCLUSTER]
  4869 0000DEEB 7406                <1> 	je	short anyi_3
  4870 0000DEED 66C1EB02            <1> 	shr	bx, 2 ; /4 (byte offset)
  4871 0000DEF1 EBDC                <1> 	jmp	short anyi_1 	
  4872                              <1> anyi_3:
  4873 0000DEF3 66C1EB02            <1> 	shr	bx, 2 ; /4 (bytes offset) (index)
  4874 0000DEF7 F9                  <1> 	stc
  4875 0000DEF8 C3                  <1> 	retn
  4876                              <1> 
  4877                              <1> ; Retro UNIX 386 v1 Kernel (v0.2) - SYS9.INC
  4878                              <1> ; Last Modification: 09/12/2015
  4879                              <1> 
  4880                              <1> syssleep:
  4881                              <1> 	; 29/06/2015 - (Retro UNIX 386 v1)
  4882                              <1> 	; 11/06/2014 - (Retro UNIX 8086 v1)
  4883                              <1> 	;
  4884                              <1> 	; Retro UNIX 8086 v1 feature only
  4885                              <1> 	; (INPUT -> none)
  4886                              <1> 	;
  4887 0000DEF9 0FB61D[B3030300]    <1> 	movzx	ebx, byte [u.uno] ; process number
  4888 0000DF00 8AA3[7F000300]      <1> 	mov	ah, [ebx+p.ttyc-1] ; current/console tty
  4889 0000DF06 E841190000          <1> 	call	sleep
  4890 0000DF0B E952E8FFFF          <1> 	jmp	sysret
  4891                              <1> 
  4892                              <1> _vp_clr:
  4893                              <1> 	; Reset/Clear Video Page
  4894                              <1> 	;
  4895                              <1> 	; 30/06/2015 - (Retro UNIX 386 v1)
  4896                              <1> 	; 21/05/2013 - 30/10/2013(Retro UNIX 8086 v1) (U0.ASM)
  4897                              <1> 	;
  4898                              <1> 	; Retro UNIX 8086 v1 feature only !
  4899                              <1> 	;
  4900                              <1> 	; INPUTS -> 
  4901                              <1> 	;   BH = video page number	 
  4902                              <1> 	;
  4903                              <1> 	; OUTPUT ->
  4904                              <1> 	;   none
  4905                              <1> 	; ((Modified registers: eAX, BH, eCX, eDX, eSI, eDI))
  4906                              <1> 	;
  4907                              <1> 	; 04/12/2013
  4908 0000DF10 28C0                <1> 	sub	al, al
  4909                              <1> 	; al = 0 (clear video page)
  4910                              <1> 	; bh = video page ; 13/05/2016
  4911 0000DF12 B407                <1> 	mov	ah, 07h
  4912                              <1> 	; ah = 7 (attribute/color)
  4913 0000DF14 6631C9              <1> 	xor 	cx, cx ; 0, left upper column (cl) & row (cl)
  4914 0000DF17 66BA4F18            <1> 	mov	dx, 184Fh ; right lower column & row (dl=24, dh=79)
  4915 0000DF1B E8F33AFFFF          <1> 	call	_scroll_up
  4916                              <1> 	; bh = video page
  4917 0000DF20 6631D2              <1> 	xor	dx, dx ; 0 (cursor position) 
  4918 0000DF23 E9293EFFFF          <1> 	jmp 	_set_cpos
  4919                              <1> 
  4920                              <1> sysmsg:
  4921                              <1> 	; 13/05/2016
  4922                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  4923                              <1> 	; 01/07/2015 - 11/11/2015 (Retro UNIX 386 v1)
  4924                              <1> 	; Print user-application message on user's console tty
  4925                              <1> 	;
  4926                              <1> 	; Input -> EBX = Message address
  4927                              <1> 	;	   ECX = Message length (max. 255)
  4928                              <1> 	;	   DL = Color (IBM PC Rombios color attributes)
  4929                              <1> 	;
  4930 0000DF28 81F9FF000000        <1> 	cmp	ecx, MAX_MSG_LEN ; 255
  4931 0000DF2E 0F872EE8FFFF        <1> 	ja	sysret ; nothing to do with big message size
  4932 0000DF34 08C9                <1> 	or	cl, cl
  4933 0000DF36 0F8426E8FFFF        <1> 	jz	sysret
  4934 0000DF3C 20D2                <1> 	and	dl, dl
  4935 0000DF3E 7502                <1> 	jnz	short sysmsg0
  4936 0000DF40 B207                <1> 	mov	dl, 07h ; default color
  4937                              <1> 		; (black background, light gray character) 
  4938                              <1> sysmsg0:
  4939 0000DF42 891D[84030300]      <1> 	mov	[u.base], ebx
  4940 0000DF48 8815[EF580100]      <1> 	mov	[ccolor], dl ; color attributes
  4941 0000DF4E 89E5                <1> 	mov	ebp, esp
  4942 0000DF50 31DB                <1> 	xor	ebx, ebx ; 0
  4943 0000DF52 891D[8C030300]      <1> 	mov	[u.nread], ebx ; 0
  4944                              <1> 	;
  4945 0000DF58 381D[C6030300]      <1> 	cmp	[u.kcall], bl ; 0
  4946 0000DF5E 7769                <1> 	ja	short sysmsgk ; Temporary (01/07/2015)
  4947                              <1> 	;
  4948 0000DF60 890D[88030300]      <1> 	mov	[u.count], ecx
  4949 0000DF66 41                  <1> 	inc	ecx ; + 00h ; ASCIIZ
  4950 0000DF67 29CC                <1> 	sub	esp, ecx
  4951 0000DF69 89E7                <1> 	mov	edi, esp
  4952 0000DF6B 89E6                <1> 	mov	esi, esp
  4953 0000DF6D 66891D[C4030300]    <1> 	mov	[u.pcount], bx ; reset page (phy. addr.) counter
  4954                              <1> 	; 11/11/2015
  4955 0000DF74 8A25[94030300]      <1> 	mov 	ah, [u.ttyp] ; recent open tty
  4956                              <1> 	; 0 = none
  4957 0000DF7A FECC                <1> 	dec	ah
  4958 0000DF7C 790C                <1> 	jns	short sysmsg1 
  4959 0000DF7E 8A1D[B3030300]      <1> 	mov	bl, [u.uno] ; process number	
  4960 0000DF84 8AA3[7F000300]      <1> 	mov	ah, [ebx+p.ttyc-1] ; user's (process's) console tty
  4961                              <1> sysmsg1:
  4962 0000DF8A 8825[96030300]      <1> 	mov	[u.ttyn], ah
  4963                              <1> sysmsg2:
  4964 0000DF90 E808080000          <1> 	call	cpass
  4965 0000DF95 7416                <1> 	jz	short sysmsg5
  4966 0000DF97 AA                  <1> 	stosb
  4967 0000DF98 20C0                <1> 	and	al, al
  4968 0000DF9A 75F4                <1> 	jnz	short sysmsg2
  4969                              <1> sysmsg3:
  4970 0000DF9C 80FC07              <1> 	cmp	ah, 7 ; tty number
  4971 0000DF9F 7711                <1> 	ja	short sysmsg6 ; serial port
  4972 0000DFA1 E83E000000          <1> 	call	print_cmsg
  4973                              <1> sysmsg4:
  4974 0000DFA6 89EC                <1> 	mov	esp, ebp	
  4975 0000DFA8 E9B5E7FFFF          <1> 	jmp	sysret
  4976                              <1> sysmsg5:
  4977 0000DFAD C60700              <1> 	mov	byte [edi], 0
  4978 0000DFB0 EBEA                <1> 	jmp	short sysmsg3
  4979                              <1> sysmsg6:
  4980 0000DFB2 8A06                <1> 	mov	al, [esi]
  4981 0000DFB4 E891180000          <1> 	call	sndc
  4982 0000DFB9 72EB                <1> 	jc	short sysmsg4
  4983 0000DFBB 803E00              <1> 	cmp	byte [esi], 0  ; 0 is stop character
  4984 0000DFBE 76E6                <1> 	jna	short sysmsg4
  4985 0000DFC0 46                  <1> 	inc 	esi
  4986 0000DFC1 8A25[96030300]      <1> 	mov	ah, [u.ttyn]
  4987 0000DFC7 EBE9                <1> 	jmp	short sysmsg6
  4988                              <1> 
  4989                              <1> sysmsgk: ; Temporary (01/07/2015)
  4990                              <1> 	; The message has been sent by Kernel (ASCIIZ string)
  4991                              <1> 	; (ECX -character count- will not be considered)
  4992 0000DFC9 8B35[84030300]      <1> 	mov	esi, [u.base]
  4993 0000DFCF 8A25[EE580100]      <1> 	mov	ah, [ptty] ; present/current screen (video page)
  4994 0000DFD5 8825[96030300]      <1> 	mov	[u.ttyn], ah
  4995 0000DFDB C605[C6030300]00    <1> 	mov	byte [u.kcall], 0
  4996 0000DFE2 EBB8                <1> 	jmp	short sysmsg3
  4997                              <1> 	
  4998                              <1> print_cmsg: 
  4999                              <1> 	; 18/11/2017
  5000                              <1> 	; 13/05/2016 - TRDOS 386 (TRDOS v2.0)
  5001                              <1> 	; 01/07/2015 (Retro UNIX 386 v1)
  5002                              <1> 	;
  5003                              <1> 	; print message (on user's console tty) 
  5004                              <1> 	;	with requested color
  5005                              <1> 	;
  5006                              <1> 	; INPUTS:
  5007                              <1> 	;	esi = message address
  5008                              <1> 	;	[u.ttyn] = tty number (0 to 7)
  5009                              <1> 	;	[ccolor] = color attributes (IBM PC BIOS colors)
  5010                              <1> 	
  5011                              <1> 	;mov	bh, ah
  5012 0000DFE4 8A3D[96030300]      <1> 	mov	bh, [u.ttyn]
  5013                              <1> 	;mov	bl, [ccolor] ; *
  5014                              <1> pcmsg1:
  5015 0000DFEA AC                  <1> 	lodsb
  5016 0000DFEB 20C0                <1> 	and 	al, al  ; 0
  5017 0000DFED 740F                <1> 	jz 	short pcmsg2
  5018 0000DFEF 56                  <1> 	push 	esi
  5019 0000DFF0 8A1D[EF580100]      <1> 	mov	bl, [ccolor]  ; * (video.s 'u11'&'beep' change BL)
  5020                              <1> 	;mov	bh, [u.ttyn]
  5021 0000DFF6 E8C03CFFFF          <1> 	call 	_write_tty 
  5022 0000DFFB 5E                  <1> 	pop	esi
  5023 0000DFFC EBEC                <1> 	jmp	short pcmsg1
  5024                              <1> pcmsg2:
  5025 0000DFFE C3                  <1> 	retn
  5026                              <1> 
  5027                              <1> sysgeterr:
  5028                              <1> 	; 09/12/2015
  5029                              <1> 	; 21/09/2015 - (Retro UNIX 386 v1 feature only!)
  5030                              <1> 	; Get last error number or page fault count
  5031                              <1> 	; (for debugging)
  5032                              <1> 	;
  5033                              <1> 	; Input -> EBX = return type
  5034                              <1> 	;	   0 = last error code (which is in 'u.error')	
  5035                              <1> 	;	   FFFFFFFFh = page fault count for running process
  5036                              <1> 	;	   FFFFFFFEh = total page fault count
  5037                              <1> 	;	   1 .. FFFFFFFDh = undefined 
  5038                              <1> 	;
  5039                              <1> 	; Output -> EAX = last error number or page fault count
  5040                              <1> 	;	   (depending on EBX input)
  5041                              <1> 	; 	
  5042 0000DFFF 21DB                <1> 	and 	ebx, ebx
  5043 0000E001 750B                <1> 	jnz	short glerr_2
  5044                              <1> glerr_0:
  5045 0000E003 A1[C8030300]        <1> 	mov	eax, [u.error]
  5046                              <1> glerr_1:
  5047 0000E008 A3[64030300]        <1> 	mov	[u.r0], eax
  5048 0000E00D C3                  <1>  	retn
  5049                              <1> glerr_2:
  5050 0000E00E 43                  <1> 	inc	ebx ; FFFFFFFFh -> 0, FFFFFFFEh -> FFFFFFFFh
  5051 0000E00F 74FD                <1> 	jz	short glerr_2 ; page fault count for process
  5052 0000E011 43                  <1> 	inc	ebx ; FFFFFFFFh -> 0	
  5053 0000E012 75EF                <1> 	jnz	short glerr_0
  5054 0000E014 A1[80050300]        <1> 	mov	eax, [PF_Count] ; total page fault count
  5055 0000E019 EBED                <1>         jmp     short glerr_1
  5056                              <1> glerr_3:
  5057 0000E01B A1[CC030300]        <1> 	mov 	eax, [u.pfcount]
  5058 0000E020 EBE6                <1> 	jmp	short glerr_1
  5059                              <1> 
  5060                              <1> load_and_run_file:
  5061                              <1> 	; 18/11/2017
  5062                              <1> 	; 22/01/2017
  5063                              <1> 	; 04/01/2017, 07/01/2017
  5064                              <1> 	; 24/10/2016
  5065                              <1> 	; 24/04/2016, 02/05/2016, 03/05/2016, 06/05/2016
  5066                              <1> 	; 23/04/2016 (TRDOS 386 = TRDOS v2.0)
  5067                              <1> 	; 23/10/2015 (Retro UNIX 386 v1, 'sysexec')
  5068                              <1> 	; 23/06/2015 (Retro UNIX 386 v1 - Beginning)
  5069                              <1> 	; 03/06/2013 - 06/12/2013 (Retro UNIX 8086 v1)
  5070                              <1> 	; EAX = First Cluster number
  5071                              <1> 	; EDX = File Size
  5072                              <1> 	; ESI = Argument list address
  5073                              <1> 	; [argc] = argument count
  5074                              <1> 	; [u.nread] = argument list length
  5075                              <1> 	; [esp] = return address to the caller (*)
  5076                              <1> 	;
  5077 0000E022 8935[4C040300]      <1> 	mov	[argv], esi
  5078 0000E028 8915[55040300]      <1> 	mov	[i.size], edx
  5079 0000E02E A3[51040300]        <1> 	mov	[ii], eax
  5080                              <1> 
  5081                              <1> 	;sti	; 07/01/2017
  5082                              <1> 	;mov	eax, [k_page_dir]
  5083                              <1> 	;mov	[u.pgdir], eax
  5084 0000E033 31C0                <1> 	xor 	eax, eax ; clc ; *** ; 04/01/2017
  5085                              <1> 	;mov	[u.r0], eax ; 0 ; 07/01/2017
  5086                              <1> 
  5087                              <1> 	; 06/05/2016
  5088                              <1> 	; Set 'sysexit' return order to MainProg
  5089                              <1> 	;
  5090 0000E035 58                  <1> 	pop	eax ; * 'loc_load_and_run_file_8:' address
  5091                              <1> 	;; 22/01/2017
  5092                              <1> 	;;cli ; 07/01/2017
  5093 0000E036 8B25[5C580100]      <1> 	mov	esp, [tss.esp0]
  5094                              <1> 	;
  5095                              <1> 	; 'loc_load_run_file_8' address has 
  5096                              <1> 	; 'jmp loc_file_rw_restore_retn' instruction
  5097                              <1> 	; 'loc_file_rw_restore_retn:' will return to
  5098                              <1> 	; [mainprog_return_addr] 
  5099                              <1> 	; just after 'call command_interpreter'
  5100                              <1> 	;
  5101 0000E03C 68[AB630000]        <1> 	push	_end_of_mainprog ; we must not return to here !
  5102 0000E041 FF35[40650100]      <1> 	push	dword [mainprog_return_addr]
  5103 0000E047 89E5                <1> 	mov	ebp, esp ; **
  5104                              <1> 	;	
  5105 0000E049 9C                  <1> 	pushfd  ; EFLAGS      ; IRETD ; ***
  5106 0000E04A 6A08                <1> 	push	KCODE ; cs    ; IRETD
  5107 0000E04C 50                  <1> 	push	eax ; * (eip) ; IRETD
  5108 0000E04D 8925[5C030300]      <1> 	mov	[u.sp], esp
  5109                              <1> 	;mov	byte [u.quant], time_count
  5110 0000E053 1E                  <1> 	push	ds
  5111 0000E054 06                  <1> 	push	es
  5112 0000E055 0FA0                <1> 	push	fs
  5113 0000E057 0FA8                <1> 	push	gs	
  5114                              <1> 	;mov	eax, [u.r0]
  5115 0000E059 29C0                <1> 	sub	eax, eax
  5116 0000E05B 60                  <1> 	pushad
  5117 0000E05C 68[62C70000]        <1> 	push	sysret
  5118                              <1> 	;push	sysrel1 ; 07/01/2017
  5119 0000E061 8925[60030300]      <1> 	mov	[u.usp], esp
  5120                              <1> 	;
  5121 0000E067 E845060000          <1> 	call	wswap ; Save MainProg (process 1) 'u' structure
  5122                              <1> 		      ; and registers for return (from program)	
  5123 0000E06C 89EC                <1> 	mov	esp, ebp ; **
  5124                              <1> 	;;22/01/2017
  5125                              <1> 	;;sti ; 07/01/2017
  5126 0000E06E 50                  <1> 	push	eax  ; * 'loc_load_and_run_file_8:' address
  5127                              <1> 	;
  5128                              <1> 	;;; 02/05/2016
  5129                              <1> 	;;; Create a new process (parent: MainProg)	
  5130 0000E06F 31F6                <1> 	xor 	esi, esi
  5131                              <1> cnpm_1: ; search p.stat table for unused process number
  5132 0000E071 46                  <1> 	inc	esi
  5133 0000E072 80BE[AF000300]00    <1> 	cmp	byte [esi+p.stat-1], 0 ; SFREE
  5134                              <1> 				; is process active, unused, dead
  5135 0000E079 760B                <1> 	jna	short cnpm_2	; it's unused so branch
  5136 0000E07B 6683FE10            <1> 	cmp	si, nproc 	; all processes checked
  5137 0000E07F 72F0                <1> 	jb	short cnpm_1    ; no, branch back
  5138 0000E081 E99B83FFFF          <1> 	jmp	panic 
  5139                              <1> cnpm_2:
  5140 0000E086 A1[B8030300]        <1> 	mov	eax, [u.pgdir] ; page directory of MainProg
  5141 0000E08B A3[BC030300]        <1> 	mov	[u.ppgdir], eax ; parent's page directory
  5142 0000E090 E8426BFFFF          <1> 	call	allocate_page
  5143 0000E095 0F828683FFFF        <1> 	jc	panic
  5144                              <1> 	; EAX = UPAGE (user structure page) address
  5145 0000E09B A3[B4030300]        <1> 	mov	[u.upage], eax ; memory page for 'user' struct (child)
  5146 0000E0A0 89F7                <1> 	mov	edi, esi
  5147 0000E0A2 66C1E702            <1> 	shl	di, 2
  5148 0000E0A6 8987[BC000300]      <1> 	mov	[edi+p.upage-4], eax ; memory page for 'user' struct
  5149 0000E0AC E8A06BFFFF          <1> 	call	clear_page ; 03/05/2016
  5150                              <1> 	;movzx	eax, byte [p.ttyc] ; console tty (for MainProg)
  5151 0000E0B1 6629C0              <1> 	sub	ax, ax ; 0
  5152 0000E0B4 668986[7F000300]    <1> 	mov     [esi+p.ttyc-1], ax ; al - set child's console tty
  5153                              <1> 				   ; ah - reset child's wait channel	
  5154 0000E0BB 89F0                <1> 	mov	eax, esi
  5155 0000E0BD A2[B3030300]        <1> 	mov	[u.uno], al ; child process number
  5156 0000E0C2 FE86[AF000300]      <1>         inc     byte [esi+p.stat-1] ; 1, SRUN
  5157 0000E0C8 66D1E6              <1> 	shl	si, 1 ; multiply si by 2 to get index into p.pid table
  5158 0000E0CB 66FF05[4E030300]    <1> 	inc	word [mpid] ; increment m.pid; get a new process name
  5159 0000E0D2 66A1[4E030300]      <1> 	mov	ax, [mpid]
  5160 0000E0D8 668986[1E000300]    <1> 	mov	[esi+p.pid-2], ax ; put new process name 
  5161                              <1> 				  ; in child process' name slot
  5162                              <1> 	;mov	ax, [p.pid]  ; get process name of MainProg
  5163 0000E0DF 66B80100            <1> 	mov	ax, 1
  5164 0000E0E3 668986[3E000300]    <1> 	mov	[esi+p.ppid-2], ax ; put parent process name 
  5165                              <1> 			           ; in parent process slot for child
  5166 0000E0EA 6648                <1> 	dec	ax ; 0
  5167 0000E0EC 66A3[94030300]      <1> 	mov 	[u.ttyp], ax ; 0
  5168                              <1> 	;;;
  5169 0000E0F2 A1[51040300]        <1> 	mov 	eax,  [ii]
  5170                              <1> 	; Retro UNIX 386 v1, 'sysexec' (u2.s)
  5171 0000E0F7 E84C170000          <1> 	call	iopen
  5172                              <1> 	; 06/06/2016
  5173 0000E0FC C605[A9030300]01    <1> 	mov	byte [u.pri], 1 ; normal priority
  5174                              <1> 	;
  5175 0000E103 EB16                <1> 	jmp	short sysexec_7 ; 02/05/2016
  5176                              <1> 
  5177                              <1> sysexec_6:
  5178                              <1> 	; 19/11/2017
  5179                              <1> 	; 18/11/2017
  5180                              <1> 	; 14/11/2017
  5181                              <1> 	; 13/11/2017
  5182 0000E105 8925[4C040300]      <1> 	mov	[argv], esp ; *!* ; start address of argument list 
  5183                              <1> 
  5184                              <1> 	; 04/01/2017
  5185                              <1> 	; 24/10/2016
  5186                              <1> 	;;02/05/2016
  5187                              <1> 	; 23/04/2016 (TRDOS 386)
  5188                              <1> 	; 18/10/2015 ('sysexec_6')
  5189                              <1> 	; 23/06/2015
  5190 0000E10B A1[B8030300]        <1> 	mov	eax, [u.pgdir] ; physical address of page directory
  5191                              <1> 	;cmp 	eax, [k_page_dir] ; TRDOS MainProg ? 
  5192                              <1> 	;je	short sysexec_7
  5193                              <1> 	; 19/11/2017
  5194 0000E110 8B1D[BC030300]      <1> 	mov	ebx, [u.ppgdir] ; phy addr of the parent's page dir
  5195 0000E116 E8F56BFFFF          <1> 	call	deallocate_page_dir
  5196                              <1> sysexec_7:
  5197 0000E11B E8256BFFFF          <1> 	call	make_page_dir
  5198 0000E120 0F82FB82FFFF        <1> 	jc	panic  ; allocation error 
  5199                              <1> 		       ; after a deallocation would be nonsence !?
  5200                              <1> 	; 24/07/2015
  5201                              <1> 	; map kernel pages (1st 4MB) to PDE 0
  5202                              <1> 	;     of the user's page directory
  5203                              <1> 	;     (It is needed for interrupts!)
  5204                              <1> 	; 18/10/2015
  5205 0000E126 8B15[C0580100]      <1> 	mov	edx, [k_page_dir] ; Kernel's page directory
  5206 0000E12C 8B02                <1> 	mov	eax, [edx] ; physical address of
  5207                              <1> 			   ; kernel's first page table (1st 4 MB)
  5208                              <1> 			   ; (PDE 0 of kernel's page directory)
  5209 0000E12E 8B15[B8030300]      <1> 	mov 	edx, [u.pgdir]
  5210 0000E134 8902                <1> 	mov	[edx], eax ; PDE 0 (1st 4MB)
  5211                              <1> 	;
  5212                              <1> 	; 20/07/2015
  5213 0000E136 BB00004000          <1> 	mov	ebx, CORE ; start address = 0 (virtual) + CORE
  5214                              <1> 	; 18/10/2015
  5215 0000E13B BE[3C040300]        <1> 	mov	esi, pcore ; physical start address
  5216                              <1> sysexec_8:	
  5217 0000E140 B907000000          <1> 	mov	ecx, PDE_A_USER + PDE_A_WRITE + PDE_A_PRESENT
  5218 0000E145 E8196BFFFF          <1> 	call	make_page_table
  5219 0000E14A 0F82D182FFFF        <1> 	jc	panic
  5220                              <1> 	;mov	ecx, PTE_A_USER + PTE_A_WRITE + PTE_A_PRESENT
  5221 0000E150 E81C6BFFFF          <1> 	call	make_page ; make new page, clear and set the pte 
  5222 0000E155 0F82C682FFFF        <1> 	jc	panic
  5223                              <1> 	;
  5224 0000E15B 8906                <1> 	mov	[esi], eax ; 24/06/2015
  5225                              <1> 	; ebx = virtual address (24/07/2015)
  5226 0000E15D E8B470FFFF          <1> 	call 	add_to_swap_queue
  5227                              <1> 	; 18/10/2015
  5228 0000E162 81FE[40040300]      <1> 	cmp	esi, ecore ; user's stack (last) page ?
  5229 0000E168 740C                <1> 	je	short sysexec_9 ; yes
  5230 0000E16A BE[40040300]        <1> 	mov	esi, ecore  ; physical address of the last page 
  5231                              <1> 	; 20/07/2015
  5232 0000E16F BB00F0FFFF          <1> 	mov	ebx, (ECORE - PAGE_SIZE) + CORE
  5233                              <1> 	; ebx = virtual end address + segment base address - 4K
  5234 0000E174 EBCA                <1>         jmp     short sysexec_8
  5235                              <1> sysexec_9:
  5236                              <1> 	; 19/11/2017 
  5237                              <1> 	; 24/04/2016 (TRDOS 386 = TRDOS v2.0)
  5238                              <1> 	; 25/06/2015, 26/08/2015, 18/10/2015
  5239                              <1> 	; move arguments from kernel stack to [ecore]
  5240                              <1> 	; (argument list/line will be copied from kernel stack
  5241                              <1> 	; frame to the last (stack) page of user's core memory)
  5242                              <1> 	; 18/10/2015
  5243 0000E176 8B3D[40040300]      <1> 	mov	edi, [ecore]
  5244 0000E17C 81C700100000        <1> 	add	edi, PAGE_SIZE
  5245                              <1> 	; 19/11/2017
  5246 0000E182 83EF04              <1> 	sub	edi, 4
  5247 0000E185 C70700000000        <1> 	mov	dword [edi], 0 
  5248 0000E18B 89FB                <1> 	mov	ebx, edi
  5249                              <1> 	;
  5250 0000E18D 0FB705[4A040300]    <1> 	movzx	eax, word [argc]
  5251 0000E194 09C0                <1> 	or	eax, eax
  5252 0000E196 7445                <1> 	jz	short sysexec_13 ; 19/11/2017
  5253                              <1> 	;jnz	short sysexec_10
  5254                              <1> 	;mov 	ebx, edi
  5255                              <1> 	;sub	ebx, 4 
  5256                              <1> 	;mov	[ebx], eax ; 0
  5257                              <1> 	;jmp 	short sysexec_13
  5258                              <1> sysexec_10:
  5259 0000E198 8B0D[8C030300]      <1> 	mov	ecx, [u.nread]
  5260                              <1> 	; 13/11/2017
  5261                              <1> 	;mov	esi, TextBuffer ; 'load_and_execute_file'
  5262                              <1> 	;mov	esi, esp  	; 'sysexec'
  5263 0000E19E 8B35[4C040300]      <1> 	mov	esi, [argv] ; 24/04/2016 (TRDOS 386  = TRDOS v2.0)
  5264                              <1> 	;sub	edi, ecx ; page end address - argument list length
  5265 0000E1A4 29CB                <1> 	sub	ebx, ecx ; 19/11/2017
  5266 0000E1A6 89C2                <1> 	mov	edx, eax
  5267 0000E1A8 FEC2                <1> 	inc	dl ; argument count + 1 for argc value  
  5268 0000E1AA C0E202              <1> 	shl 	dl, 2  ; 4 * (argument count + 1)
  5269                              <1> 	;mov	ebx, edi
  5270 0000E1AD 89DF                <1> 	mov	edi, ebx ; 19//11/2017
  5271 0000E1AF 80E3FC              <1> 	and	bl, 0FCh ; 32 bit (dword) alignment
  5272 0000E1B2 29D3                <1> 	sub 	ebx, edx
  5273 0000E1B4 89FA                <1> 	mov	edx, edi
  5274 0000E1B6 F3A4                <1> 	rep	movsb
  5275 0000E1B8 89D6                <1> 	mov 	esi, edx
  5276 0000E1BA 89DF                <1> 	mov 	edi, ebx
  5277 0000E1BC BA00F0BFFF          <1> 	mov	edx, ECORE - PAGE_SIZE ; virtual addr. of the last page
  5278 0000E1C1 2B15[40040300]      <1> 	sub 	edx, [ecore] ; difference (virtual - physical) 
  5279 0000E1C7 AB                  <1> 	stosd	; eax = argument count	
  5280                              <1> sysexec_11:
  5281 0000E1C8 89F0                <1> 	mov	eax, esi
  5282 0000E1CA 01D0                <1> 	add	eax, edx
  5283 0000E1CC AB                  <1> 	stosd  ; eax = virtual address
  5284                              <1> 	;dec	byte [argc]
  5285 0000E1CD 66FF0D[4A040300]    <1> 	dec	word [argc] ; 14/11/2017
  5286 0000E1D4 7407                <1> 	jz	short sysexec_13
  5287                              <1> sysexec_12:
  5288 0000E1D6 AC                  <1> 	lodsb
  5289 0000E1D7 20C0                <1> 	and	al, al
  5290 0000E1D9 75FB                <1> 	jnz	short sysexec_12
  5291 0000E1DB EBEB                <1> 	jmp	short sysexec_11
  5292                              <1> sysexec_13:
  5293                              <1> 	; 24/10/2016
  5294                              <1> 	; 24/04/2016 - TRDOS 386 (TRDOS v2.0)
  5295                              <1> 	; 23/06/2015 - 19/10/2015 (Retro UNIX 386 v1, 'sysexec_13')
  5296                              <1> 	;
  5297                              <1> 	; moving arguments to [ecore] is OK here..
  5298                              <1> 	;
  5299                              <1> 	; ebx = beginning addres of argument list pointers
  5300                              <1> 		;	in user's stack
  5301 0000E1DD 2B1D[40040300]      <1> 	sub 	ebx, [ecore]
  5302 0000E1E3 81C300F0BFFF        <1> 	add     ebx, (ECORE - PAGE_SIZE)
  5303                              <1> 			; end of core - 4096 (last page)
  5304                              <1> 			; (virtual address)
  5305 0000E1E9 891D[4C040300]      <1> 	mov	[argv], ebx
  5306 0000E1EF 891D[90030300]      <1> 	mov	[u.break], ebx ; available user memory
  5307                              <1> 	;
  5308 0000E1F5 29C0                <1> 	sub	eax, eax
  5309 0000E1F7 C705[88030300]2000- <1> 	mov	dword [u.count], 32 ; Executable file header size
  5309 0000E1FF 0000                <1>
  5310 0000E201 C705[74030300]-     <1> 	mov	dword [u.fofp], u.off
  5310 0000E207 [80030300]          <1>
  5311 0000E20B A3[80030300]        <1> 	mov	[u.off], eax ; 0
  5312 0000E210 A3[84030300]        <1> 	mov	[u.base], eax ; 0, start of user's core (virtual)
  5313                              <1> 	; 24/10/2016
  5314 0000E215 A0[86590100]        <1> 	mov	al, [Current_Drv]
  5315 0000E21A A2[46030300]        <1> 	mov	[cdev], al
  5316                              <1> 	;
  5317 0000E21F A1[51040300]        <1> 	mov	eax, [ii] ; Fist Cluster of the Program (PRG) file
  5318                              <1> 	; EAX = First cluster of the executable file
  5319 0000E224 E80A010000          <1> 	call	readi
  5320                              <1> 
  5321 0000E229 8B0D[90030300]      <1> 	mov	ecx, [u.break] ; top of user's stack (physical addr.)
  5322 0000E22F 890D[88030300]      <1> 	mov	[u.count], ecx ; save for overrun check
  5323                              <1> 	;
  5324 0000E235 8B0D[8C030300]      <1> 	mov	ecx, [u.nread]
  5325 0000E23B 890D[90030300]      <1> 	mov	[u.break], ecx ; virtual address (offset from start)
  5326 0000E241 80F920              <1> 	cmp	cl, 32
  5327 0000E244 7540                <1>         jne     short sysexec_15
  5328                              <1> 	;:
  5329                              <1> 	; Retro UNIX 386 v1 (32 bit) executable file header format
  5330 0000E246 8B35[3C040300]      <1> 	mov	esi, [pcore] ; start address of user's core memory 
  5331                              <1> 		             ; (phys. start addr. of the exec. file)
  5332 0000E24C AD                  <1> 	lodsd
  5333 0000E24D 663DEB1E            <1> 	cmp	ax, 1EEBh ; EBH, 1Eh -> jump to +32
  5334 0000E251 7533                <1> 	jne	short sysexec_15
  5335 0000E253 AD                  <1> 	lodsd
  5336 0000E254 89C1                <1> 	mov	ecx, eax ; text (code) section size
  5337 0000E256 AD                  <1> 	lodsd
  5338 0000E257 01C1                <1> 	add	ecx, eax ; + data section size (initialized data)
  5339 0000E259 89CB                <1> 	mov	ebx, ecx
  5340 0000E25B AD                  <1> 	lodsd	
  5341 0000E25C 01C3                <1> 	add	ebx, eax ; + bss section size (for overrun checking)
  5342 0000E25E 3B1D[88030300]      <1> 	cmp	ebx, [u.count]
  5343 0000E264 7711                <1> 	ja	short sysexec_14  ; program overruns stack !
  5344                              <1> 	;
  5345                              <1> 	; add bss section size to [u.break]
  5346 0000E266 0105[90030300]      <1> 	add 	[u.break], eax
  5347                              <1> 	;
  5348 0000E26C 83E920              <1> 	sub	ecx, 32  ; header size (already loaded)
  5349                              <1> 	;cmp	ecx, [u.count]
  5350                              <1> 	;jnb	short sysexec_16
  5351 0000E26F 890D[88030300]      <1> 	mov	[u.count], ecx ; required read count
  5352 0000E275 EB29                <1> 	jmp	short sysexec_16
  5353                              <1> sysexec_14:
  5354                              <1> 	; insufficient (out of) memory
  5355 0000E277 C705[C8030300]0400- <1> 	mov	dword [u.error], ERR_MINOR_IM ; 1
  5355 0000E27F 0000                <1>
  5356 0000E281 E9BCE4FFFF          <1> 	jmp	error
  5357                              <1> sysexec_15:
  5358 0000E286 8B15[55040300]      <1>         mov	edx, [i.size] ; file size
  5359 0000E28C 29CA                <1> 	sub	edx, ecx ; file size - loaded bytes
  5360 0000E28E 7626                <1> 	jna	short sysexec_17 ; no need to next read
  5361 0000E290 01D1                <1> 	add	ecx, edx ; [i.size]
  5362 0000E292 3B0D[88030300]      <1> 	cmp	ecx, [u.count] ; overrun check (!)
  5363 0000E298 77DD                <1> 	ja	short sysexec_14
  5364 0000E29A 8915[88030300]      <1> 	mov	[u.count], edx
  5365                              <1> sysexec_16:
  5366 0000E2A0 A1[51040300]        <1> 	mov	eax, [ii] ; first cluster
  5367 0000E2A5 E889000000          <1> 	call	readi
  5368 0000E2AA 8B0D[8C030300]      <1> 	mov	ecx, [u.nread]
  5369 0000E2B0 010D[90030300]      <1> 	add	[u.break], ecx
  5370                              <1> sysexec_17:
  5371 0000E2B6 A1[51040300]        <1> 	mov	eax, [ii] ; first cluster
  5372 0000E2BB E889150000          <1> 	call	iclose
  5373 0000E2C0 31C0                <1> 	xor     eax, eax
  5374 0000E2C2 FEC0                <1> 	inc	al
  5375 0000E2C4 66A3[AA030300]      <1> 	mov	[u.intr], ax ; 1 (interrupt/time-out is enabled)
  5376 0000E2CA 66A3[AC030300]      <1> 	mov	[u.quit], ax ; 1 ('crtl+brk' signal is enabled) 
  5377 0000E2D0 833D[BC030300]00    <1>         cmp	dword [u.ppgdir], 0  ; is the caller MainProg (kernel) ?
  5378 0000E2D7 770C                <1> 	ja	short sysexec_18 ; no, the caller is user process
  5379                              <1> 	; If the caller is kernel (MainProg), 'sysexec' will come here
  5380 0000E2D9 8B15[C0580100]      <1> 	mov	edx, [k_page_dir] ; kernel's page directory
  5381 0000E2DF 8915[BC030300]      <1> 	mov	[u.ppgdir], edx ; next time 'sysexec' must not come here 
  5382                              <1> sysexec_18:
  5383                              <1> 	; 02/05/2016
  5384                              <1> 	; 24/04/2016 (TRDOS 386 = TRDOS v2.0)
  5385                              <1> 	; 18/10/2015 (Retro UNIX 386 v1)
  5386                              <1> 	; 05/08/2015
  5387                              <1> 	; 29/07/2015
  5388                              <1> 
  5389                              <1> ;	; **** arguments list test start - 19/11/2017
  5390                              <1> ;	mov	ebp, [argv]
  5391                              <1> ;	sub	ebp, ECORE - 4096
  5392                              <1> ;	add	ebp, [ecore]
  5393                              <1> ;
  5394                              <1> ;	mov	ebx, [ebp]
  5395                              <1> ;	mov	[argc], bx
  5396                              <1> ;	add	ebp, 4
  5397                              <1> ;	mov	byte [ccolor], 1Fh
  5398                              <1> ;_zx0:
  5399                              <1> ;	cmp	word [argc], 0
  5400                              <1> ;	jna	short _zx2	
  5401                              <1> ;_zx1:
  5402                              <1> ;	push	ebp
  5403                              <1> ;	mov	esi, [ebp]
  5404                              <1> ;
  5405                              <1> ;	sub	esi, ECORE - 4096
  5406                              <1> ;	add	esi, [ecore]
  5407                              <1> ;
  5408                              <1> ;	call	print_cmsg
  5409                              <1> ;
  5410                              <1> ;	dec	word [argc]
  5411                              <1> ;	jz	short _zx2
  5412                              <1> ;
  5413                              <1> ;	mov	al, '.'
  5414                              <1> ;	mov	bl, 07h
  5415                              <1> ;	mov	bh, [u.ttyn]
  5416                              <1> ;	call 	_write_tty 
  5417                              <1> ;
  5418                              <1> ;	pop	ebp
  5419                              <1> ;	add	ebp, 4
  5420                              <1> ;	jmp	short _zx1			
  5421                              <1> ;_zx2:
  5422                              <1> ;	pop	ebp
  5423                              <1> ;	mov	byte [ccolor], 07h
  5424                              <1> ;	mov	eax, 1
  5425                              <1> ;	; **** arguments list test stop
  5426                              <1> ;	Test result is OK! (there is not a wrong thing) - 19/11/2017
  5427                              <1> 
  5428 0000E2E5 8B2D[4C040300]      <1> 	mov	ebp, [argv] ; user's stack pointer must point to argument
  5429                              <1> 			    ; list pointers (argument count)
  5430 0000E2EB FA                  <1> 	cli
  5431 0000E2EC 8B25[5C580100]      <1>         mov     esp, [tss.esp0] ; ring 0 (kernel) stack pointer
  5432                              <1> 	;mov   	esp, [u.sp] ; Restore Kernel stack
  5433                              <1> 			    ; for this process	 
  5434                              <1> 	;add	esp, 20 ; --> EIP, CS, EFLAGS, ESP, SS
  5435                              <1> 	;xor	eax, eax ; 0
  5436 0000E2F2 FEC8                <1> 	dec	al ; eax = 0
  5437                              <1> 	;mov	edx, UDATA
  5438                              <1> 	; 18/11/2017
  5439 0000E2F4 6A23                <1> 	push	UDATA ; user's stack segment
  5440                              <1> 	;push	edx
  5441 0000E2F6 55                  <1> 	push	ebp ; user's stack pointer
  5442                              <1> 		    ; (points to number of arguments)
  5443                              <1> 	
  5444                              <1> 	; 04/01/2017
  5445                              <1> 	; MainProg comes here while [sysflg]= 0FFh
  5446                              <1> 	; (but sysexec comes here while [sysflg]= 0)
  5447 0000E2F7 C605[5B030300]00    <1> 	mov	byte [sysflg], 0 ; 04/01/2017
  5448                              <1> 				 ; (timer_int sysflg control)
  5449 0000E2FE FB                  <1> 	sti
  5450 0000E2FF 9C                  <1> 	pushfd	; EFLAGS
  5451                              <1> 		; Set IF for enabling interrupts in user mode	
  5452                              <1> 	;or	dword [esp], 200h 
  5453                              <1> 	;
  5454                              <1> 	;mov	bx, UCODE
  5455                              <1> 	;push	bx ; user's code segment
  5456 0000E300 6A1B                <1> 	push	UCODE
  5457                              <1> 	;push	0
  5458 0000E302 50                  <1> 	push	eax ; EIP (=0) - start address -	
  5459 0000E303 8925[5C030300]      <1> 	mov	[u.sp], esp ; 29/07/2015
  5460                              <1> 	; 05/08/2015
  5461                              <1> 	; Remedy of a General Protection Fault during 'iretd' is here !
  5462                              <1> 	; ('push dx' would cause to general protection fault, 
  5463                              <1> 	; after 'pop ds' etc.)
  5464                              <1> 	;
  5465                              <1> 	;; push dx ; ds (UDATA)
  5466                              <1> 	;; push dx ; es (UDATA)
  5467                              <1> 	;; push dx ; fs (UDATA)
  5468                              <1> 	;; push dx ; gs (UDATA)
  5469                              <1> 	;
  5470                              <1> 	; This is a trick to prevent general protection fault
  5471                              <1> 	; during 'iretd' intruction at the end of 'sysrele' (in u1.s):
  5472 0000E309 66BA2300            <1> 	mov	dx, UDATA ; 19/11/2017
  5473 0000E30D 8EC2                <1> 	mov 	es, dx ; UDATA
  5474 0000E30F 06                  <1> 	push 	es ; ds (UDATA)
  5475 0000E310 06                  <1> 	push 	es ; es (UDATA)
  5476 0000E311 06                  <1> 	push 	es ; fs (UDATA)
  5477 0000E312 06                  <1> 	push	es ; gs (UDATA)
  5478 0000E313 66BA1000            <1> 	mov	dx, KDATA
  5479 0000E317 8EC2                <1> 	mov	es, dx
  5480                              <1> 	;
  5481                              <1> 	;; pushad simulation
  5482 0000E319 89E5                <1> 	mov	ebp, esp ; esp before pushad
  5483 0000E31B 50                  <1> 	push	eax ; eax (0)
  5484 0000E31C 50                  <1> 	push	eax ; ecx (0)
  5485 0000E31D 50                  <1> 	push	eax ; edx (0)
  5486 0000E31E 50                  <1> 	push	eax ; ebx (0)
  5487 0000E31F 55                  <1> 	push	ebp ; esp before pushad
  5488 0000E320 50                  <1> 	push	eax ; ebp (0)
  5489 0000E321 50                  <1> 	push	eax ; esi (0)		
  5490 0000E322 50                  <1> 	push	eax ; edi (0)	
  5491                              <1> 	;
  5492 0000E323 A3[64030300]        <1> 	mov	[u.r0], eax ; eax = 0
  5493 0000E328 8925[60030300]      <1> 	mov	[u.usp], esp
  5494                              <1> 
  5495                              <1> 	; 14/11/2017
  5496 0000E32E E931E4FFFF          <1> 	jmp	sysret0
  5497                              <1> 
  5498                              <1> ;	; 02/05/2016
  5499                              <1> ;	;inc	byte [sysflg] ; 0FFh -> 0
  5500                              <1> ;	;mov	byte [sysflg], 0 ; 04/01/2017
  5501                              <1> ;	movzx	ebx, byte [u.uno]
  5502                              <1> ;	shl	bl, 1 ; 13/11/2017 	
  5503                              <1> ;	cmp	word [ebx+p.ppid-2], 1 ; MainProg
  5504                              <1> ;	ja	sysret0 ; 03/05/2016
  5505                              <1> ;	push	sysret ; * 
  5506                              <1> ;	mov	[u.usp], esp
  5507                              <1> ;	call	wswap ; save child process 'u' structure and
  5508                              <1> ;		      ; registers
  5509                              <1> ;	add	dword [u.usp], 4 ; 03/05/2016 
  5510                              <1> ;sysexec_19: ; 02/05/2016
  5511                              <1> ;	retn ; * 'sysret' ; byte [sysflg] -> 0FFh
  5512                              <1> 
  5513                              <1> readi:
  5514                              <1> 	; 01/05/2016
  5515                              <1> 	; 25/04/2016 - TRDOS 386 (TRDOS v2.0)
  5516                              <1> 	; 20/05/2015 - Retro UNIX 386 v1
  5517                              <1> 	; 11/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  5518                              <1> 	;
  5519                              <1> 	; Reads from a file whose the first cluster number in EAX
  5520                              <1> 	; 
  5521                              <1> 	; INPUTS ->
  5522                              <1> 	;    EAX - First cluster number of the file
  5523                              <1> 	;    u.count - byte count user desires
  5524                              <1> 	;    u.base - points to user buffer
  5525                              <1> 	;    u.fofp - points to dword with current file offset
  5526                              <1> 	;    i.size - file size
  5527                              <1> 	;    cdev - logical dos drive number of the file
  5528                              <1> 	; OUTPUTS ->
  5529                              <1> 	;    u.count - cleared
  5530                              <1> 	;    u.nread - accumulates total bytes passed back
  5531                              <1> 	;
  5532                              <1> 	; ((EAX)) input/output
  5533                              <1> 	; (Retro UNIX Prototype : 14/12/2012 - 01/03/2013, UNIXCOPY.ASM)
  5534                              <1>         ; ((Modified registers: edx, ebx, ecx, esi, edi))  
  5535                              <1> 
  5536 0000E333 31D2                <1> 	xor	edx, edx ; 0
  5537 0000E335 8915[8C030300]      <1> 	mov 	[u.nread], edx ; 0
  5538 0000E33B 668915[C4030300]    <1> 	mov	[u.pcount], dx ; 19/05/2015
  5539 0000E342 3915[88030300]      <1> 	cmp 	[u.count], edx ; 0
  5540 0000E348 7701                <1> 	ja 	short readi_1
  5541 0000E34A C3                  <1> 	retn
  5542                              <1> readi_1:
  5543                              <1> dskr:
  5544                              <1> 	; 01/05/2016
  5545                              <1> 	; 25/04/2016 - TRDOS 386 (TRDOS v2.0)
  5546                              <1> 	; 24/05/2015 - 12/10/2015 (Retro UNIX 386 v1)
  5547                              <1> 	; 26/04/2013 - 03/08/2013 (Retro UNIX 8086 v1)
  5548                              <1> dskr_0:
  5549 0000E34B 8B15[55040300]      <1>         mov	edx, [i.size]
  5550 0000E351 8B1D[74030300]      <1> 	mov	ebx, [u.fofp]
  5551 0000E357 2B13                <1> 	sub	edx, [ebx]
  5552 0000E359 7647                <1> 	jna	short dskr_4
  5553                              <1> 	;
  5554 0000E35B 50                  <1> 	push	eax ; 01/05/2016
  5555 0000E35C 3B15[88030300]      <1> 	cmp     edx, [u.count] 
  5556 0000E362 7306                <1> 	jnb	short dskr_1
  5557 0000E364 8915[88030300]      <1> 	mov	[u.count], edx
  5558                              <1> dskr_1:
  5559                              <1> 	; EAX = First Cluster
  5560                              <1> 	; [Current_Drv] = Physical drive number 
  5561 0000E36A E83B000000          <1> 	call	mget_r
  5562                              <1> 	; NOTE: in 'mget_r', relevant sector will be read in buffer
  5563                              <1> 	; if it is not already in buffer !
  5564 0000E36F BB[8C050300]        <1> 	mov	ebx, readi_buffer
  5565 0000E374 803D[C6030300]00    <1> 	cmp	byte [u.kcall], 0 ; the caller is 'namei' sign (=1)
  5566 0000E37B 770F                <1> 	ja	short dskr_3	  ; zf=0 -> the caller is 'namei'
  5567 0000E37D 66833D[C4030300]00  <1> 	cmp	word [u.pcount], 0
  5568 0000E385 7705                <1> 	ja	short dskr_3
  5569                              <1> dskr_2:
  5570                              <1> 	; [u.base] = virtual address to transfer (as destination address)
  5571 0000E387 E894010000          <1> 	call	trans_addr_w ; translate virtual address to physical (w)
  5572                              <1> dskr_3:
  5573                              <1> 	; EBX (r5) = system (I/O) buffer address -physical-
  5574 0000E38C E8F7010000          <1> 	call	sioreg
  5575 0000E391 87F7                <1> 	xchg	esi, edi
  5576                              <1> 	; EDI = file (user data) offset
  5577                              <1> 	; ESI = sector (I/O) buffer offset
  5578                              <1> 	; ECX = byte count
  5579 0000E393 F3A4                <1> 	rep	movsb
  5580                              <1> 	; eax = remain bytes in buffer
  5581                              <1>         ;       (check if remain bytes in the buffer > [u.pcount])
  5582 0000E395 09C0                <1> 	or	eax, eax
  5583 0000E397 75EE                <1> 	jnz	short dskr_2 ; (page end before system buffer end!)		
  5584 0000E399 58                  <1> 	pop	eax  ; (first cluster number)
  5585 0000E39A 390D[88030300]      <1> 	cmp	[u.count], ecx ; 0
  5586 0000E3A0 77A9                <1> 	ja	short dskr_0
  5587                              <1> dskr_4:
  5588 0000E3A2 C605[C6030300]00    <1> 	mov	byte [u.kcall], 0
  5589 0000E3A9 C3                  <1> 	retn
  5590                              <1> 
  5591                              <1> mget_r:
  5592                              <1> 	; 24/10/2016
  5593                              <1> 	; 22/10/2016
  5594                              <1> 	; 12/10/2016
  5595                              <1> 	; 29/04/2016
  5596                              <1> 	; 25/04/2016 - TRDOS 386 (TRDOS v2.0)
  5597                              <1> 	; 03/06/2015 (Retro UNIX 386 v1, 'mget', u.5s)
  5598                              <1> 	; 22/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  5599                              <1> 	;
  5600                              <1> 	; Get existing or (allocate) a new disk block for file
  5601                              <1> 	; 
  5602                              <1> 	; INPUTS ->
  5603                              <1> 	;    [u.fofp] = file offset pointer
  5604                              <1> 	;    EAX = First Cluster
  5605                              <1> 	;    [cdev] = Logical dos drive number 	  
  5606                              <1> 	;    ([u.off] = file offset)
  5607                              <1> 	; OUTPUTS ->
  5608                              <1> 	;    EAX = logical sector number
  5609                              <1> 	;    ESI = Logical Dos Drive Description Table address	
  5610                              <1> 	;
  5611                              <1> 	; Modified registers: EDX, EBX, ECX, ESI, EDI
  5612                              <1> 
  5613 0000E3AA 8B35[74030300]      <1> 	mov     esi, [u.fofp]
  5614 0000E3B0 8B1E                <1> 	mov	ebx, [esi] ; (u.off)
  5615                              <1> 
  5616 0000E3B2 29C9                <1> 	sub	ecx, ecx
  5617 0000E3B4 8A2D[46030300]      <1> 	mov	ch, [cdev]
  5618                              <1> 
  5619 0000E3BA BE00010900          <1> 	mov	esi, Logical_DOSDisks
  5620 0000E3BF 01CE                <1> 	add	esi, ecx
  5621                              <1> 
  5622 0000E3C1 380D[F4640100]      <1> 	cmp	[readi.valid], cl ; 0
  5623 0000E3C7 7649                <1> 	jna	short mget_r_0
  5624                              <1> 	
  5625 0000E3C9 3A2D[F5640100]      <1> 	cmp	ch, [readi.drv]
  5626 0000E3CF 7541                <1> 	jne	short mget_r_0
  5627                              <1> 
  5628 0000E3D1 3B05[08650100]      <1> 	cmp	eax, [readi.fclust]
  5629 0000E3D7 7565                <1> 	jne	short mget_r_3
  5630                              <1> 	
  5631 0000E3D9 89D8                <1> 	mov	eax, ebx ; file offset
  5632 0000E3DB 668B0D[FC640100]    <1> 	mov	cx, [readi.bpc]
  5633 0000E3E2 41                  <1> 	inc	ecx ; <= 65536
  5634 0000E3E3 29D2                <1> 	sub	edx, edx
  5635 0000E3E5 F7F1                <1> 	div	ecx
  5636                              <1> 
  5637 0000E3E7 8B3D[04650100]      <1> 	mov	edi, [readi.c_index] ; cluster index
  5638                              <1> 
  5639 0000E3ED 39F8                <1> 	cmp	eax, edi
  5640 0000E3EF 757A                <1>         jne     short mget_r_4  ; (*)
  5641                              <1> 
  5642                              <1> 	; edx = byte offset in cluster (<= 65535)
  5643 0000E3F1 668915[FE640100]    <1> 	mov	[readi.offset], dx
  5644 0000E3F8 66C1EA09            <1> 	shr	dx, 9 ; / 512
  5645 0000E3FC 8815[F7640100]      <1> 	mov	[readi.s_index], dl ; sector index in cluster (0 to spc -1)
  5646                              <1> 	
  5647 0000E402 A1[00650100]        <1> 	mov	eax, [readi.cluster]  ; > 0 if [readi.valid] = 1
  5648 0000E407 8B15[0C650100]      <1> 	mov	edx, [readi.fs_index]
  5649 0000E40D E99A000000          <1>         jmp     mget_r_7
  5650                              <1> 	
  5651                              <1> mget_r_0:
  5652 0000E412 882D[F5640100]      <1> 	mov	[readi.drv], ch ; physical drive number
  5653 0000E418 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  5654 0000E41C 7707                <1> 	ja	short mget_r_1
  5655 0000E41E 8A4E12              <1> 	mov	cl, [esi+LD_FS_BytesPerSec+1]
  5656 0000E421 D0E9                <1> 	shr	cl, 1 ;  ; 1 for 512 bytes, 4 for 2048 bytes
  5657 0000E423 EB03                <1> 	jmp	short mget_r_2	
  5658                              <1> mget_r_1:
  5659 0000E425 8A4E13              <1> 	mov	cl, [esi+LD_BPB+BPB_SecPerClust]
  5660                              <1> mget_r_2:
  5661 0000E428 880D[F6640100]      <1> 	mov	[readi.spc], cl  ; sectors per cluster
  5662                              <1> 	; NOTE: readi bytes per sector value is always 512 ! 
  5663 0000E42E 66C1E109            <1> 	shl	cx, 9 ; * 512
  5664 0000E432 6649                <1> 	dec	cx ; bytes per cluster - 1
  5665 0000E434 66890D[FC640100]    <1> 	mov	[readi.bpc], cx
  5666 0000E43B 6629C9              <1> 	sub	cx, cx
  5667                              <1> mget_r_3:
  5668 0000E43E A3[08650100]        <1> 	mov	[readi.fclust], eax ; first cluster (or FDT address)
  5669 0000E443 880D[F4640100]      <1> 	mov	[readi.valid], cl ; 0 
  5670                              <1> 	;mov	[readi.s_index], cl ; 0
  5671                              <1> 	;mov	[readi.offset], cx ; 0
  5672 0000E449 890D[04650100]      <1> 	mov	[readi.c_index], ecx ; 0
  5673 0000E44F 890D[00650100]      <1> 	mov	[readi.cluster], ecx ; 0
  5674 0000E455 890D[F8640100]      <1> 	mov	[readi.sector], ecx ; 0
  5675                              <1> 	
  5676 0000E45B 89D8                <1> 	mov	eax, ebx ; file offset
  5677 0000E45D 668B0D[FC640100]    <1> 	mov	cx, [readi.bpc]
  5678 0000E464 41                  <1> 	inc	ecx ; <= 65536
  5679 0000E465 29D2                <1> 	sub	edx, edx
  5680 0000E467 F7F1                <1> 	div	ecx
  5681                              <1> 	;mov	edi, [readi.c_index] ; previous cluster index
  5682 0000E469 29FF                <1> 	sub	edi, edi
  5683                              <1> mget_r_4:
  5684 0000E46B A3[04650100]        <1> 	mov	[readi.c_index], eax ; cluster index
  5685                              <1> 	; edx = byte offset in cluster (<= 65535)
  5686 0000E470 668915[FE640100]    <1> 	mov	[readi.offset], dx
  5687 0000E477 66C1EA09            <1> 	shr	dx, 9 ; / 512
  5688 0000E47B 8815[F7640100]      <1> 	mov	[readi.s_index], dl ; sector index in cluster (0 to spc -1)
  5689                              <1> 
  5690 0000E481 89C1                <1> 	mov	ecx, eax ; current cluster index
  5691 0000E483 A1[08650100]        <1> 	mov	eax, [readi.fclust]
  5692 0000E488 09C9                <1> 	or	ecx, ecx ; cluster index
  5693 0000E48A 741B                <1> 	jz	short mget_r_6
  5694                              <1> 
  5695 0000E48C 39CF                <1> 	cmp	edi, ecx
  5696 0000E48E 7710                <1> 	ja	short mget_r_5 ; old cluster index is higher
  5697 0000E490 8B15[00650100]      <1> 	mov	edx, [readi.cluster]
  5698 0000E496 21D2                <1> 	and	edx, edx
  5699 0000E498 7406                <1> 	jz	short mget_r_5
  5700                              <1> 	; valid 'readi' parameters (*)
  5701 0000E49A 89D0                <1> 	mov	eax, edx
  5702 0000E49C 29F9                <1> 	sub	ecx, edi
  5703 0000E49E 740C                <1> 	jz	short mget_r_7
  5704                              <1> mget_r_5:
  5705                              <1> 	; EAX = Beginning cluster
  5706                              <1> 	; EDX = Sector index in disk/file section
  5707                              <1> 	;	(Only for SINGLIX file system!)
  5708                              <1> 	; ECX = Cluster sequence number after the beginning cluster
  5709                              <1> 	; ESI = Logical DOS Drive Description Table address
  5710 0000E4A0 E836E1FFFF          <1> 	call	get_cluster_by_index
  5711 0000E4A5 724E                <1> 	jc	short mget_r_err
  5712                              <1> 	; EAX = Cluster number		
  5713                              <1> mget_r_6:
  5714 0000E4A7 A3[00650100]        <1> 	mov	[readi.cluster], eax ; FDT number for Singlix File System
  5715                              <1> mget_r_7:
  5716 0000E4AC 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  5717 0000E4B0 765F                <1> 	jna	short mget_r_12
  5718                              <1> 
  5719 0000E4B2 83E802              <1> 	sub	eax, 2
  5720 0000E4B5 0FB615[F6640100]    <1> 	movzx	edx, byte [readi.spc]
  5721 0000E4BC F7E2                <1> 	mul	edx
  5722                              <1> 
  5723 0000E4BE 034668              <1> 	add	eax, [esi+LD_DATABegin]
  5724 0000E4C1 8A15[F7640100]      <1> 	mov	dl, [readi.s_index]
  5725 0000E4C7 01D0                <1> 	add	eax, edx
  5726                              <1> mget_r_8:
  5727                              <1> 	; eax = logical sector number
  5728 0000E4C9 803D[F4640100]00    <1> 	cmp	byte [readi.valid], 0
  5729 0000E4D0 7608                <1> 	jna	short mget_r_9
  5730 0000E4D2 3B05[F8640100]      <1> 	cmp	eax, [readi.sector]
  5731 0000E4D8 7436                <1> 	je	short mget_r_11 ; sector is already in 'readi' buffer
  5732                              <1> mget_r_9:
  5733 0000E4DA A3[F8640100]        <1> 	mov	[readi.sector], eax
  5734 0000E4DF BB[8C050300]        <1> 	mov	ebx, readi_buffer ; buffer address
  5735 0000E4E4 B901000000          <1> 	mov	ecx, 1
  5736                              <1> 	; 29/04/2016
  5737                              <1> 	;xor	dl, dl
  5738                              <1> 
  5739                              <1> 	; EAX = Logical sector number
  5740                              <1> 	; ECX = Sector count
  5741                              <1> 	; EBX = Buffer address
  5742                              <1> 	; (EDX = 0)
  5743                              <1> 	; ESI = Logical DOS drive description table address	
  5744                              <1> 
  5745 0000E4E9 E86E130000          <1> 	call	disk_read
  5746 0000E4EE 7314                <1> 	jnc	short mget_r_10
  5747                              <1> 
  5748                              <1> 	; 22/10/2016 (15h -> 17)
  5749 0000E4F0 B811000000          <1> 	mov	eax, 17 ; Drive not ready or read error !
  5750                              <1> mget_r_err:
  5751 0000E4F5 A3[C8030300]        <1> 	mov	[u.error], eax
  5752                              <1> 	; 12/10/2016
  5753 0000E4FA A3[64030300]        <1> 	mov	[u.r0], eax
  5754 0000E4FF E93EE2FFFF          <1> 	jmp	error
  5755                              <1> mget_r_10:
  5756 0000E504 C605[F4640100]01    <1> 	mov	byte [readi.valid], 1 ; 24/10/2016
  5757 0000E50B A1[F8640100]        <1> 	mov	eax, [readi.sector]
  5758                              <1> mget_r_11:
  5759 0000E510 C3                  <1> 	retn
  5760                              <1> mget_r_12:
  5761                              <1> 	; EAX = FDT number
  5762                              <1> 	; EDX = Sector index from FDT sector (0,1,2,3,4...)
  5763 0000E511 40                  <1> 	inc	eax ; the first data sector in FS disk section	
  5764 0000E512 8915[0C650100]      <1> 	mov	[readi.fs_index], edx
  5765 0000E518 01D0                <1> 	add	eax, edx
  5766 0000E51A EBAD                <1> 	jmp	short mget_r_8
  5767                              <1> 
  5768                              <1> trans_addr_r:
  5769                              <1> 	; 12/10/2016
  5770                              <1> 	; 02/05/2016 - TRDOS 386 (TRDOS v2.0)
  5771                              <1> 	; Translate virtual address to physical address 
  5772                              <1> 	; for reading from user's memory space
  5773                              <1> 	; 04/06/2015 - 18/10/2015 (Retro UNIX 386 v1)
  5774                              <1> 
  5775 0000E51C 31D2                <1> 	xor	edx, edx ; 0 (read access sign)
  5776 0000E51E EB04                <1> 	jmp 	short trans_addr_rw
  5777                              <1> 
  5778                              <1> trans_addr_w:
  5779                              <1> 	; 12/10/2016
  5780                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  5781                              <1> 	; Translate virtual address to physical address 
  5782                              <1> 	; for writing to user's memory space
  5783                              <1> 	; 04/06/2015 - 18/10/2015 (Retro UNIX 386 v1)
  5784                              <1> 	
  5785 0000E520 29D2                <1> 	sub	edx, edx
  5786 0000E522 FEC2                <1> 	inc	dl ; 1 (write access sign)
  5787                              <1> trans_addr_rw:
  5788 0000E524 50                  <1> 	push	eax
  5789 0000E525 53                  <1> 	push	ebx
  5790 0000E526 52                  <1> 	push 	edx ; r/w sign (in DL)
  5791                              <1> 	;
  5792 0000E527 8B1D[84030300]      <1> 	mov	ebx, [u.base]
  5793 0000E52D E8BA6DFFFF          <1> 	call	get_physical_addr ; get physical address
  5794 0000E532 730F                <1> 	jnc	short passc_0
  5795 0000E534 A3[C8030300]        <1> 	mov	[u.error], eax
  5796 0000E539 A3[64030300]        <1> 	mov	[u.r0], eax ; 12/10/2016
  5797                              <1> 	;pop	edx
  5798                              <1> 	;pop 	ebx
  5799                              <1> 	;pop	eax
  5800 0000E53E E9FFE1FFFF          <1> 	jmp	error
  5801                              <1> passc_0:
  5802 0000E543 F6C202              <1> 	test	dl, PTE_A_WRITE ; writable page
  5803 0000E546 5A                  <1> 	pop	edx
  5804 0000E547 751C                <1> 	jnz	short passc_1
  5805                              <1> 	
  5806 0000E549 20D2                <1> 	and 	dl, dl
  5807 0000E54B 7418                <1> 	jz	short passc_1
  5808                              <1> 	; read only (duplicated) page -must be copied to a new page-
  5809                              <1> 	; EBX = linear address
  5810 0000E54D 51                  <1> 	push 	ecx
  5811 0000E54E E8326AFFFF          <1> 	call 	copy_page
  5812 0000E553 59                  <1> 	pop	ecx
  5813 0000E554 721E                <1> 	jc	short passc_2
  5814 0000E556 50                  <1> 	push	eax ; physical address of the new/allocated page
  5815 0000E557 E8BA6CFFFF          <1> 	call	add_to_swap_queue	
  5816 0000E55C 58                  <1> 	pop	eax
  5817 0000E55D 81E3FF0F0000        <1> 	and 	ebx, PAGE_OFF ; 0FFFh
  5818                              <1> 	;mov 	ecx, PAGE_SIZE
  5819                              <1> 	;sub	ecx, ebx 
  5820 0000E563 01D8                <1> 	add	eax, ebx  
  5821                              <1> passc_1: 
  5822 0000E565 A3[C0030300]        <1> 	mov 	[u.pbase], eax ; physical address	
  5823 0000E56A 66890D[C4030300]    <1> 	mov	[u.pcount], cx ; remain byte count in page (1-4096)
  5824 0000E571 5B                  <1> 	pop	ebx
  5825 0000E572 58                  <1> 	pop	eax
  5826 0000E573 C3                  <1> 	retn
  5827                              <1> passc_2:
  5828 0000E574 B804000000          <1> 	mov	eax, ERR_MINOR_IM ; "Insufficient memory !" error
  5829 0000E579 A3[64030300]        <1> 	mov	[u.r0], eax ; 12/10/2016
  5830 0000E57E A3[C8030300]        <1> 	mov	dword [u.error], eax
  5831                              <1> 	;pop 	ebx
  5832                              <1> 	;pop	eax
  5833 0000E583 E9BAE1FFFF          <1> 	jmp	error
  5834                              <1> 
  5835                              <1> sioreg: 
  5836                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  5837                              <1> 	; 19/05/2015 - 25/07/2015 (Retro UNIX 386 v1)
  5838                              <1> 	; 12/03/2013 - 22/07/2013 (Retro UNIX 8086 v1)
  5839                              <1> 	; INPUTS -> 
  5840                              <1> 	;     EBX = system buffer (data) address (r5)
  5841                              <1> 	;     [u.fofp] = pointer to file offset pointer
  5842                              <1> 	;     [u.base] = virtual address of the user buffer
  5843                              <1> 	;     [u.pbase] = physical address of the user buffer
  5844                              <1> 	;     [u.count] = byte count
  5845                              <1> 	;     [u.pcount] = byte count within page frame 			
  5846                              <1> 	; OUTPUTS -> 
  5847                              <1> 	;     ESI = user data offset (r1)
  5848                              <1> 	;     EDI = system (I/O) buffer offset (r2)
  5849                              <1> 	;     ECX = byte count (r3)
  5850                              <1> 	;     EAX = remain bytes after byte count within page frame
  5851                              <1> 	;	(If EAX > 0, transfer will continue from the next page)
  5852                              <1>         ;
  5853                              <1> 	; ((Modified registers:  EDX))
  5854                              <1>  
  5855 0000E588 8B35[74030300]      <1>         mov     esi, [u.fofp]
  5856 0000E58E 8B3E                <1>         mov     edi, [esi]
  5857 0000E590 89F9                <1> 	mov	ecx, edi
  5858 0000E592 81C900FEFFFF        <1> 	or	ecx, 0FFFFFE00h
  5859 0000E598 81E7FF010000        <1> 	and	edi, 1FFh
  5860 0000E59E 01DF                <1> 	add	edi, ebx ; EBX = system buffer (data) address
  5861 0000E5A0 F7D9                <1> 	neg	ecx
  5862 0000E5A2 3B0D[88030300]      <1> 	cmp	ecx, [u.count]
  5863 0000E5A8 7606                <1> 	jna	short sioreg_0
  5864 0000E5AA 8B0D[88030300]      <1> 	mov	ecx, [u.count]
  5865                              <1> sioreg_0:
  5866 0000E5B0 803D[C6030300]00    <1> 	cmp	byte [u.kcall], 0 
  5867 0000E5B7 7613                <1> 	jna	short sioreg_1
  5868                              <1> 	 ; the caller is 'mkdir' or 'namei'
  5869 0000E5B9 A1[84030300]        <1> 	mov	eax, [u.base]
  5870 0000E5BE A3[C0030300]        <1> 	mov 	[u.pbase], eax ; physical address = virtual address
  5871 0000E5C3 66890D[C4030300]    <1> 	mov	word [u.pcount], cx ; remain bytes in buffer (1 sector)
  5872 0000E5CA EB0B                <1> 	jmp	short sioreg_2
  5873                              <1> sioreg_1:
  5874 0000E5CC 0FB715[C4030300]    <1> 	movzx	edx, word [u.pcount]
  5875 0000E5D3 39D1                <1> 	cmp	ecx, edx	
  5876 0000E5D5 772A                <1> 	ja	short sioreg_4 ; transfer count > [u.pcount]
  5877                              <1> sioreg_2: ; 2:
  5878 0000E5D7 31C0                <1> 	xor 	eax, eax
  5879                              <1> sioreg_3:
  5880 0000E5D9 010D[8C030300]      <1> 	add 	[u.nread], ecx
  5881 0000E5DF 290D[88030300]      <1> 	sub 	[u.count], ecx
  5882 0000E5E5 010D[84030300]      <1> 	add 	[u.base], ecx
  5883 0000E5EB 010E                <1>         add 	[esi], ecx 
  5884 0000E5ED 8B35[C0030300]      <1> 	mov	esi, [u.pbase]
  5885 0000E5F3 66290D[C4030300]    <1> 	sub	[u.pcount], cx
  5886 0000E5FA 010D[C0030300]      <1> 	add	[u.pbase], ecx
  5887 0000E600 C3                  <1>         retn
  5888                              <1> sioreg_4:
  5889                              <1> 	; transfer count > [u.pcount] 
  5890                              <1> 	; (ecx > edx)
  5891 0000E601 89C8                <1> 	mov	eax, ecx
  5892 0000E603 29D0                <1> 	sub	eax, edx ; remain bytes for 1 sector (block) transfer 
  5893 0000E605 89D1                <1> 	mov	ecx, edx ; current transfer count = [u.pcount]
  5894 0000E607 EBD0                <1> 	jmp	short sioreg_3
  5895                              <1> 
  5896                              <1> tswitch: ; Retro UNIX 386 v1
  5897                              <1> tswap:
  5898                              <1> 	; 16/01/2017
  5899                              <1> 	; 21/05/2016 - TRDOS 386 (TRDOS v2.0)
  5900                              <1> 	; 10/05/2015 - 01/09/2015 (Retro UNIX 386 v1)
  5901                              <1> 	; 14/04/2013 - 14/02/2014 (Retro UNIX 8086 v1)
  5902                              <1> 	; time out swap, called when a user times out.
  5903                              <1> 	; the user is put on the low priority queue.
  5904                              <1> 	; This is done by making a link from the last user
  5905                              <1> 	; on the low priority queue to him via a call to 'putlu'.
  5906                              <1> 	; then he is swapped out.
  5907                              <1> 
  5908                              <1> 	; TRDOS 386 (TRDOS v2.0) modification ->  ** 21/05/2016 **
  5909                              <1> 	;     * when a high priority (event) process will be stopped
  5910                              <1> 	;	(swapped out, swithched out/off), 'tswap/tswitch' will
  5911                              <1> 	;	not add it to a run queue. 
  5912                              <1> 	;	/// What for: Process may be already in a run queue, 
  5913                              <1> 	;	it is unspeficied state because process might be started
  5914                              <1> 	;	by a timer event which does not regard previous priority
  5915                              <1> 	;	level and run queue of the process (for fast executing!).
  5916                              <1> 	;	After the 'run for event', process will be sequenced
  5917                              <1> 	;	to run by it's actual run queue. ///
  5918                              <1> 	;
  5919                              <1> 	; Retro UNIX 386 v1 modification ->
  5920                              <1> 	;       swap (software task switch) is performed by changing
  5921                              <1> 	;	user's page directory (u.pgdir) instead of segment change
  5922                              <1> 	;	as in Retro UNIX 8086 v1.
  5923                              <1> 	;
  5924                              <1> 	; RETRO UNIX 8086 v1 modification ->
  5925                              <1> 	;       'swap to disk' is replaced with 'change running segment'
  5926                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
  5927                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
  5928                              <1> 	;	compatibles was using 1MB segmented memory 
  5929                              <1> 	;	in 8086/8088 times.
  5930                              <1> 	;
  5931                              <1> 	; INPUTS ->
  5932                              <1> 	;    u.uno - users process number
  5933                              <1> 	;    runq+4 - lowest priority queue
  5934                              <1> 	; OUTPUTS ->
  5935                              <1> 	;    r0 - users process number
  5936                              <1> 	;    r2 - lowest priority queue address
  5937                              <1> 	;
  5938                              <1> 	; ((AX = R0, BX = R2)) output
  5939                              <1> 	; ((Modified registers: EDX, EBX, ECX, ESI, EDI))  	
  5940                              <1> 	;
  5941                              <1> 
  5942                              <1> 	NOTE:
  5943                              <1> 	;* [u.pri] priority level is specified by run queue which is process 
  5944                              <1> 	;  comes to run from.
  5945                              <1> 	;* Initial [u.pri] is 1 ('normal/regular') for programs 
  5946                              <1> 	;  (which are launched by MainProg or 'sysexec'), it is changed
  5947                              <1> 	;  to 2 ('high') by timer event, if program uses 'systimer' system call.
  5948                              <1> 	;* Program (Process) also can change it's running priority 
  5949                              <1> 	;  from 1 to 0 or up to 2 by using 'syspri' system call; but,
  5950                              <1> 	;  if program selects priority level 2 (high) for running, next time 
  5951                              <1> 	;  it is reduced to 1 (normal/regular) because 'syspri' adds this
  5952                              <1> 	;  program to 'run for normal' queue while running duration is a bit
  5953                              <1> 	;  protected from swap/switch out immediate, behalf of other high 
  5954                              <1> 	;  priority process in sequence. Program (with high priority) will not 
  5955                              <1> 	;  be swapped/switched out (by timer event) before it's time quantum 
  5956                              <1> 	;  will be elapsed, but, this will be temporary if program is not using 
  5957                              <1> 	;  timer event function.	  			 	
  5958                              <1> 
  5959                              <1> 	;For example:
  5960                              <1> 	;If a process frequently gets a timer event, it runs at high priority
  5961                              <1> 	;level but when it returns from running it returns to actual run queue,
  5962                              <1> 	;not to 'run for event' queue again.
  5963                              <1> 	;'tswap' will not change the sequence at return/stop(swap out) stage.
  5964                              <1> 	;But if priority level not high (=2, 'run for event'), 'tswap/tswitch'
  5965                              <1> 	;will add the stopping process to relevant run queue according to
  5966                              <1> 	;[u.pri] priority level.
  5967                              <1> 
  5968                              <1> 	; 16/01/2017
  5969 0000E609 BB[54030300]        <1> 	mov	ebx, runq+2 	; 'runq_normal' ; normal/regular priority
  5970                              <1> 	; 21/05/2016
  5971                              <1> 	;cmp	byte [u.pri], 2	; high priority (run for event) ?
  5972                              <1> 	;jnb	short swap
  5973                              <1> 	; 16/01/2017
  5974                              <1> 	; (Normal and also high/event priority processes will be added to
  5975                              <1> 	; normal priority run queue for ensuring circular running sequence!)
  5976                              <1> 	; (Timer interrupt or 'syspri' system call may change priority and run
  5977                              <1> 	; queue to high/event level.)
  5978 0000E60E 803D[A9030300]00    <1> 	cmp	byte [u.pri], 0
  5979 0000E615 7702                <1> 	ja	short tswap_1	; normal priority run queue
  5980                              <1> 	;
  5981 0000E617 43                  <1> 	inc	ebx
  5982 0000E618 43                  <1> 	inc	ebx		; runq+4, 'runq_background', low priority
  5983                              <1> tswap_1:
  5984 0000E619 A0[B3030300]        <1> 	mov 	al, [u.uno]
  5985                              <1> 	       	; movb u.uno,r1 / move users process number to r1
  5986                              <1> 		; mov  $runq+4,r2 
  5987                              <1> 			; / move lowest priority queue address to r2
  5988                              <1>       	; ebx = run queue
  5989 0000E61E E8FE000000          <1> 	call 	putlu
  5990                              <1> 		; jsr r0,putlu / create link from last user on Q to 
  5991                              <1> 		             ; / u.uno's user
  5992                              <1> 
  5993                              <1> switch: ; Retro UNIX 386 v1
  5994                              <1> swap:
  5995                              <1> 	; 02/01/2017
  5996                              <1> 	; 21/05/2016
  5997                              <1> 	; 20/05/2016
  5998                              <1> 	; 02/05/2016
  5999                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6000                              <1> 	; 10/05/2015 - 02/09/2015 (Retro UNIX 386 v1)
  6001                              <1> 	; 14/04/2013 - 08/03/2014 (Retro UNIX 8086 v1)
  6002                              <1> 	;
  6003                              <1> 	; 'swap' is routine that controls the swapping of processes
  6004                              <1> 	; in and out of core.
  6005                              <1> 	;
  6006                              <1> 	; TRDOS 386 (TRDOS v2.0) modification ->  ** 20/05/2016 **
  6007                              <1> 	;     * 3 different priority level is applied 
  6008                              <1> 	;	(just as original unix v1)
  6009                              <1> 	;	1) high priority (event) run queue, 'runq_event'
  6010                              <1> 	;	2) normal priority (regular) run queue, 'runq_normal'
  6011                              <1> 	;	3) low priority (background) run queue, 'runq_backgroud'
  6012                              <1> 	;	'swap' code will run a process which has max. priority
  6013                              <1>         ;       (for earliest event at first)
  6014                              <1> 	;
  6015                              <1> 	; Retro UNIX 386 v1 modification ->
  6016                              <1> 	;       swap (software task switch) is performed by changing
  6017                              <1> 	;	user's page directory (u.pgdir) instead of segment change
  6018                              <1> 	;	as in Retro UNIX 8086 v1.
  6019                              <1> 	;
  6020                              <1> 	; RETRO UNIX 8086 v1 modification ->
  6021                              <1> 	;       'swap to disk' is replaced with 'change running segment'
  6022                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
  6023                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
  6024                              <1> 	;	compatibles was using 1MB segmented memory 
  6025                              <1> 	;	in 8086/8088 times.
  6026                              <1> 	;
  6027                              <1> 	; INPUTS ->
  6028                              <1> 	;    runq table - contains processes to run.
  6029                              <1> 	;    p.link - contains next process in line to be run.
  6030                              <1> 	;    u.uno - process number of process in core	
  6031                              <1> 	;    s.stack - swap stack used as an internal stack for swapping.	
  6032                              <1> 	; OUTPUTS ->
  6033                              <1> 	;    (original unix v1 -> present process to its disk block)
  6034                              <1> 	;    (original unix v1 -> new process into core -> 
  6035                              <1> 	;	   Retro Unix 8086 v1 -> segment registers changed 
  6036                              <1> 	;	   for new process)
  6037                              <1> 	;    u.quant = 3 (Time quantum for a process)
  6038                              <1> 	; 	((INT 1Ch count down speed -> 18.2 times per second)	 	
  6039                              <1> 	;    RETRO UNIX 8086 v1 will use INT 1Ch (18.2 times per second)
  6040                              <1> 	;	 for now, it will swap the process if there is not
  6041                              <1> 	;	 a keyboard event (keystroke) (Int 15h, function 4Fh)
  6042                              <1> 	;	 or will count down from 3 to 0 even if there is a
  6043                              <1> 	;        keyboard event locking due to repetitive key strokes.
  6044                              <1> 	;	 u.quant will be reset to 3 for RETRO UNIX 8086 v1.
  6045                              <1> 	;
  6046                              <1> 	; ((Modified registers: EAX, EDX, EBX, ECX, ESI, EDI))  	
  6047                              <1> 
  6048                              <1> 	;NOTE:
  6049                              <1> 	;High priority queue is the first for selecting a process to run.
  6050                              <1> 	;If there is not a process in high priority level run queue,
  6051                              <1> 	;a process in normal priority run queue will be selected
  6052                              <1> 	;or a proces in low priority run queue will be selected if normal
  6053                              <1> 	;priority level run queue is empty.
  6054                              <1> 	
  6055                              <1> 	; 21/05/2016 -(3 priority levels, 3 run queues)
  6056 0000E623 BE[52030300]        <1> 	mov	esi, runq ; 'runq_event' ; high priority, 'run for event'
  6057 0000E628 C605[50650100]03    <1> 	mov	byte [priority], 3 ; high priority + 1
  6058 0000E62F 31DB                <1> 	xor	ebx, ebx ; 02/01/2017
  6059                              <1> swap_0: ; 1: / search runq table for highest priority process
  6060 0000E631 66AD                <1> 	lodsw  ; mov ax, [esi], add esi+2
  6061                              <1> 	;xor	ebx, ebx ; 02/05/2016
  6062 0000E633 6621C0              <1> 	and 	ax, ax ; are there any processes to run in this Q entry
  6063 0000E636 750E                <1> 	jnz	short swap_2 
  6064                              <1> 	; 21/05/2026
  6065                              <1> 	; runq_normal = runq+2, runq_background = runq+4
  6066 0000E638 FE0D[50650100]      <1> 	dec	byte [priority] ; 3 -> 3, 2 -> 1, 1-> 0
  6067 0000E63E 75F1                <1> 	jnz	short swap_0	
  6068                              <1> 	;cmp	esi, runq+6  ; if zero compare address to end of table
  6069                              <1> 	;jb	short swap_0 ; if not at end, go back
  6070                              <1> swap_1:
  6071                              <1> 	; 02/05/2016
  6072                              <1> 	; 29/04/2016 (TRDOS 386 = TRDOS v2.0)
  6073                              <1> 	; No user process to run...
  6074                              <1> 	; Run the kernel process... MainProg: Internal Command Interpreter  
  6075 0000E640 FEC0                <1> 	inc	al ; mov al, 1  ; process number of MainProg
  6076 0000E642 FEC3                <1> 	inc	bl ; mov bl, al ; 1
  6077 0000E644 EB1E                <1> 	jmp	short swap_4
  6078                              <1> swap_2:
  6079                              <1> 	; 21/05/2016
  6080 0000E646 FE0D[50650100]      <1> 	dec	byte [priority] ; priority level of present user/process
  6081                              <1> 			        ; 0, 1, 2	   
  6082 0000E64C 4E                  <1> 	dec	esi
  6083 0000E64D 4E                  <1>         dec     esi
  6084                              <1> 	;
  6085 0000E64E 88C3                <1> 	mov	bl, al
  6086 0000E650 38E0                <1> 	cmp	al, ah ; is there only 1 process in the queue to be run
  6087 0000E652 740A                <1> 	je	short swap_3 ; yes
  6088 0000E654 8AA3[9F000300]      <1> 	mov	ah, [ebx+p.link-1] 
  6089 0000E65A 8826                <1>        	mov	[esi], ah ; move next process in line into run queue
  6090 0000E65C EB06                <1> 	jmp	short swap_4
  6091                              <1> swap_3: 
  6092 0000E65E 6631D2              <1> 	xor	dx, dx
  6093 0000E661 668916              <1> 	mov	[esi], dx ; zero the entry; no processes on the Q
  6094                              <1> swap_4: 
  6095 0000E664 8A25[B3030300]      <1> 	mov 	ah, [u.uno]
  6096 0000E66A 38C4                <1> 	cmp	ah, al ; is this process the same as the process in core?
  6097 0000E66C 743B                <1>        	je	short swap_8 ; yes, don't have to swap
  6098 0000E66E 08E4                <1> 	or	ah, ah  ; is the process # = 0
  6099 0000E670 740D                <1>        	jz	short swap_6 ; 'sysexit'
  6100                              <1> 	;cmp	ah, al ;is this process the same as the process in core?
  6101                              <1>        	;je	short swap_8 ; yes, don't have to swap
  6102 0000E672 8925[60030300]      <1> 	mov	[u.usp], esp ; return  address for 'syswait' & 'sleep'
  6103 0000E678 E834000000          <1> 	call	wswap   ; write out core to disk
  6104 0000E67D EB1C                <1> 	jmp 	short swap_7
  6105                              <1> swap_6:
  6106                              <1> 	; Deallocate memory pages belong to the process
  6107                              <1> 	; which is being terminated.
  6108                              <1> 	; (Retro UNIX 386 v1 modification !)
  6109                              <1> 	;
  6110 0000E67F 53                  <1> 	push	ebx
  6111 0000E680 A1[B8030300]        <1> 	mov 	eax, [u.pgdir]  ; page directory of the process
  6112 0000E685 8B1D[BC030300]      <1> 	mov	ebx, [u.ppgdir] ; page directory of the parent process
  6113 0000E68B E88066FFFF          <1> 	call	deallocate_page_dir
  6114 0000E690 A1[B4030300]        <1> 	mov	eax, [u.upage] ; 'user' structure page of the process
  6115 0000E695 E81B67FFFF          <1> 	call	deallocate_page
  6116 0000E69A 5B                  <1> 	pop	ebx
  6117                              <1> swap_7: 
  6118 0000E69B C0E302              <1> 	shl	bl, 2 ; * 4 
  6119 0000E69E 8B83[BC000300]      <1> 	mov	eax, [ebx+p.upage-4] ; the 'u' page of the new process
  6120 0000E6A4 E840000000          <1> 	call	rswap ; read new process into core
  6121                              <1> swap_8: 
  6122                              <1> 	; Retro UNIX  8086 v1 modification !
  6123 0000E6A9 C605[A8030300]04    <1> 	mov	byte [u.quant], time_count 
  6124 0000E6B0 C3                  <1> 	retn
  6125                              <1> 
  6126                              <1> wswap:  ; < swap out, swap to disk >
  6127                              <1> 	; 28/02/2017 (fnsave)
  6128                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6129                              <1> 	; 09/05/2015 (Retro UNIX 386 v1)
  6130                              <1> 	; 26/05/2013 - 08/03/2014 (Retro UNIX 8086 v1)
  6131                              <1> 	; 'wswap' writes out the process that is in core onto its 
  6132                              <1> 	; appropriate disk area.
  6133                              <1> 	;
  6134                              <1> 	; Retro UNIX 386 v1 modification ->
  6135                              <1> 	;       User (u) structure content and the user's register content
  6136                              <1> 	;	will be copied to the process's/user's UPAGE (a page for
  6137                              <1> 	;	saving 'u' structure and user registers for task switching).
  6138                              <1> 	;	u.usp - points to kernel stack address which contains
  6139                              <1> 	;		user's registers while entering system call.  
  6140                              <1> 	;	u.sp  - points to kernel stack address 
  6141                              <1> 	;		to return from system call -for IRET-.
  6142                              <1> 	;	[u.usp]+32+16 = [u.sp] 
  6143                              <1> 	;	[u.usp] -> edi, esi, ebp, esp (= [u.usp]+32), ebx, 
  6144                              <1> 	;		edx, ecx, eax, gs, fs, es, ds, -> [u.sp].
  6145                              <1> 	;
  6146                              <1> 	; Retro UNIX 8086 v1 modification ->
  6147                              <1> 	;       'swap to disk' is replaced with 'change running segment'
  6148                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
  6149                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
  6150                              <1> 	;	compatibles was using 1MB segmented memory 
  6151                              <1> 	;	in 8086/8088 times.
  6152                              <1> 	;
  6153                              <1> 	; INPUTS ->
  6154                              <1> 	;    u.break - points to end of program
  6155                              <1> 	;    u.usp - stack pointer at the moment of swap
  6156                              <1> 	;    core - beginning of process program		
  6157                              <1> 	;    ecore - end of core 	
  6158                              <1> 	;    user - start of user parameter area		
  6159                              <1> 	;    u.uno - user process number	
  6160                              <1> 	;    p.dska - holds block number of process	
  6161                              <1> 	; OUTPUTS ->
  6162                              <1> 	;    swp I/O queue
  6163                              <1> 	;    p.break - negative word count of process 
  6164                              <1> 	;    r1 - process disk address	
  6165                              <1> 	;    r2 - negative word count
  6166                              <1> 	;
  6167                              <1> 	; RETRO UNIX 8086 v1 input/output:
  6168                              <1> 	;
  6169                              <1> 	; INPUTS ->
  6170                              <1> 	;    u.uno - process number (to be swapped out)
  6171                              <1> 	; OUTPUTS ->
  6172                              <1> 	;    none
  6173                              <1> 	;
  6174                              <1> 	;   ((Modified registers: ECX, ESI, EDI))  
  6175                              <1> 	;
  6176                              <1> 
  6177                              <1> 	; 28/02/2017
  6178                              <1> 	;cmp	byte [multi_tasking], 0  ; Musti tasking mode ?
  6179                              <1> 	;jna	short wswp
  6180 0000E6B1 803D[DA030300]00    <1> 	cmp	byte [u.fpsave], 0 ; 28/02/2017
  6181 0000E6B8 7606                <1> 	jna	short wswp
  6182 0000E6BA DD35[DC030300]      <1> 	fnsave	[u.fpregs] ; save floating point registers (94 bytes)
  6183                              <1> wswp:
  6184 0000E6C0 8B3D[B4030300]      <1> 	mov	edi, [u.upage] ; process's user (u) structure page addr
  6185 0000E6C6 B938000000          <1> 	mov	ecx, (U_SIZE + 3) / 4
  6186 0000E6CB BE[5C030300]        <1> 	mov	esi, user ; active user (u) structure	
  6187 0000E6D0 F3A5                <1> 	rep	movsd
  6188                              <1> 	;
  6189 0000E6D2 8B35[60030300]      <1> 	mov	esi, [u.usp] ; esp (system stack pointer, 
  6190                              <1> 			     ;      points to user registers)
  6191 0000E6D8 8B0D[5C030300]      <1> 	mov	ecx, [u.sp]  ; return address from the system call
  6192                              <1> 			     ; (for IRET)
  6193                              <1> 			     ; [u.sp] -> EIP (user)
  6194                              <1> 			     ; [u.sp+4]-> CS (user)
  6195                              <1> 			     ; [u.sp+8] -> EFLAGS (user)
  6196                              <1> 			     ; [u.sp+12] -> ESP (user)
  6197                              <1> 			     ; [u.sp+16] -> SS (user)	
  6198 0000E6DE 29F1                <1> 	sub	ecx, esi     ; required space for user registers
  6199 0000E6E0 83C114              <1> 	add	ecx, 20	     ; +5 dwords to return from system call
  6200                              <1> 			     ; (for IRET) 	
  6201 0000E6E3 C1E902              <1> 	shr	ecx, 2	     		
  6202 0000E6E6 F3A5                <1> 	rep	movsd
  6203 0000E6E8 C3                  <1> 	retn
  6204                              <1> 
  6205                              <1> rswap:  ; < swap in, swap from disk >
  6206                              <1> 	; 28/02/2017 (frstor)
  6207                              <1> 	; 15/01/2017
  6208                              <1> 	; 14/01/2017
  6209                              <1> 	; 21/05/2016
  6210                              <1> 	; 03/05/2016
  6211                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6212                              <1> 	; 09/05/2015 - 15/09/2015 (Retro UNIX 386 v1)
  6213                              <1> 	; 26/05/2013 - 08/03/2014 (Retro UNIX 8086 v1)
  6214                              <1> 	; 'rswap' reads a process whose number is in r1, 
  6215                              <1> 	; from disk into core.
  6216                              <1> 	;
  6217                              <1> 	; Retro UNIX 386 v1 modification ->
  6218                              <1> 	;       User (u) structure content and the user's register content
  6219                              <1> 	;	will be restored from process's/user's UPAGE (a page for
  6220                              <1> 	;	saving 'u' structure and user registers for task switching).
  6221                              <1> 	;	u.usp - points to kernel stack address which contains
  6222                              <1> 	;		user's registers while entering system call.  
  6223                              <1> 	;	u.sp  - points to kernel stack address 
  6224                              <1> 	;		to return from system call -for IRET-.
  6225                              <1> 	;	[u.usp]+32+16 = [u.sp] 
  6226                              <1> 	;	[u.usp] -> edi, esi, ebp, esp (= [u.usp]+32), ebx, 
  6227                              <1> 	;		edx, ecx, eax, gs, fs, es, ds, -> [u.sp].
  6228                              <1> 	;
  6229                              <1> 	; RETRO UNIX 8086 v1 modification ->
  6230                              <1> 	;       'swap to disk' is replaced with 'change running segment'
  6231                              <1> 	;	according to 8086 cpu (x86 real mode) architecture.
  6232                              <1> 	;	pdp-11 was using 64KB uniform memory while IBM PC
  6233                              <1> 	;	compatibles was using 1MB segmented memory 
  6234                              <1> 	;	in 8086/8088 times.
  6235                              <1> 	;
  6236                              <1> 	; INPUTS ->
  6237                              <1> 	;    r1 - process number of process to be read in
  6238                              <1> 	;    p.break - negative of word count of process 
  6239                              <1> 	;    p.dska - disk address of the process		
  6240                              <1> 	;    u.emt - determines handling of emt's 	
  6241                              <1> 	;    u.ilgins - determines handling of illegal instructions		
  6242                              <1> 	; OUTPUTS ->
  6243                              <1> 	;    8 = (u.ilgins)
  6244                              <1> 	;    24 = (u.emt)
  6245                              <1> 	;    swp - bit 10 is set to indicate read 
  6246                              <1> 	;		(bit 15=0 when reading is done)	
  6247                              <1> 	;    swp+2 - disk block address
  6248                              <1> 	;    swp+4 - negative word count 	
  6249                              <1> 	;      ((swp+6 - address of user structure)) 
  6250                              <1> 	;
  6251                              <1> 	; RETRO UNIX 8086 v1 input/output:
  6252                              <1> 	;
  6253                              <1> 	; INPUTS ->
  6254                              <1> 	;    AL	- new process number (to be swapped in)	 
  6255                              <1> 	; OUTPUTS ->
  6256                              <1> 	;    none
  6257                              <1> 	;
  6258                              <1> 	;   ((Modified registers: EAX, ECX, ESI, EDI, ESP)) 
  6259                              <1> 	;
  6260                              <1> 	; Retro UNIX 386 v1 - modification ! 14/05/2015
  6261 0000E6E9 89C6                <1> 	mov	esi, eax  ; process's user (u) structure page addr
  6262 0000E6EB B938000000          <1> 	mov	ecx, (U_SIZE + 3) / 4
  6263 0000E6F0 BF[5C030300]        <1> 	mov	edi, user ; active user (u) structure	
  6264 0000E6F5 F3A5                <1> 	rep	movsd
  6265 0000E6F7 58                  <1> 	pop	eax	; 'rswap' return address
  6266                              <1> 	; 
  6267                              <1> 	;cli
  6268 0000E6F8 8B3D[60030300]      <1> 	mov	edi, [u.usp] ; esp (system stack pointer, 
  6269                              <1> 			     ;     points to user registers)
  6270 0000E6FE 89FC                <1> 	mov	esp, edi     ; 14/01/2017
  6271 0000E700 8B0D[5C030300]      <1> 	mov	ecx, [u.sp]  ; return address from the system call
  6272                              <1> 			     ; (for IRET)
  6273                              <1> 			     ; [u.sp] -> EIP (user)
  6274                              <1> 			     ; [u.sp+4]-> CS (user)
  6275                              <1> 			     ; [u.sp+8] -> EFLAGS (user)
  6276                              <1> 			     ; [u.sp+12] -> ESP (user)
  6277                              <1> 			     ; [u.sp+16] -> SS (user)		
  6278 0000E706 29F9                <1> 	sub	ecx, edi     ; required space for user registers
  6279 0000E708 83C114              <1> 	add	ecx, 20	     ; +5 dwords to return from system call
  6280                              <1> 			     ; (for IRET) 	
  6281 0000E70B C1E902              <1> 	shr	ecx, 2	       		
  6282 0000E70E F3A5                <1> 	rep	movsd
  6283                              <1> 	;mov	esp, [u.usp] ; 15/09/2015
  6284                              <1> 	;sti
  6285                              <1> 	; 28/02/2017
  6286                              <1> 	;cmp	byte [multi_tasking], 0  ; Musti tasking mode ?
  6287                              <1> 	;jna	short rswp_retn
  6288 0000E710 803D[DA030300]00    <1> 	cmp	byte [u.fpsave], 0
  6289 0000E717 7606                <1> 	jna	short rswp_retn
  6290 0000E719 DD25[DC030300]      <1> 	frstor	[u.fpregs] ; restore floating point regs (94 bytes)
  6291                              <1> rswp_retn:
  6292 0000E71F 50                  <1> 	push	eax	; 'rswap' return address
  6293 0000E720 C3                  <1> 	retn
  6294                              <1> 
  6295                              <1> putlu: 
  6296                              <1> 	; 20/05/2016
  6297                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6298                              <1> 	; 10/05/2015 - 12/09/2015 (Retro UNIX 386 v1)
  6299                              <1> 	; 15/04/2013 - 23/02/2014 (Retro UNIX 8086 v1)
  6300                              <1> 	; 'putlu' is called with a process number in r1 and a pointer
  6301                              <1> 	; to lowest priority Q (runq+4) in r2. A link is created from
  6302                              <1> 	; the last process on the queue to process in r1 by putting
  6303                              <1> 	; the process number in r1 into the last process's link.
  6304                              <1> 	;
  6305                              <1> 	; INPUTS ->
  6306                              <1> 	;    r1 - user process number
  6307                              <1> 	;    r2 - points to lowest priority queue 
  6308                              <1> 	;    p.dska - disk address of the process		
  6309                              <1> 	;    u.emt - determines handling of emt's 	
  6310                              <1> 	;    u.ilgins - determines handling of illegal instructions		
  6311                              <1> 	; OUTPUTS ->
  6312                              <1> 	;    r3 - process number of last process on the queue upon
  6313                              <1> 	;	  entering putlu
  6314                              <1> 	;    p.link-1 + r3 - process number in r1
  6315                              <1> 	;    r2 - points to lowest priority queue
  6316                              <1> 	;
  6317                              <1> 	; ((Modified registers: EDX, EBX)) 
  6318                              <1> 	;
  6319                              <1> 	; / r1 = user process no.; r2 points to lowest priority queue
  6320                              <1> 
  6321                              <1> 	; EBX = r2
  6322                              <1> 	; EAX = r1 (AL=r1b)
  6323                              <1> 
  6324                              <1> 	; 20/05/2016
  6325                              <1> 	; AL = process number (1 to 16) // Retro UNIX 8086, 386 v1 // 
  6326                              <1> 	;     (max. 16 processes available for current kernel version) 
  6327                              <1> 	; EBX = run queue address ; 20/05/2016 (TRDOS 386)
  6328                              <1> 		; which is one of following addresses:
  6329                              <1> 		;  1) 'runq_event' high priority run queue	 	
  6330                              <1> 		;  2) 'runq_normal' normal/regular priority run queue
  6331                              <1> 		;  3) 'runq_background' low priority run queue
  6332                              <1> 
  6333                              <1> 	;mov	ebx, runq
  6334 0000E721 0FB613              <1> 	movzx  	edx, byte [ebx]
  6335 0000E724 43                  <1> 	inc	ebx
  6336 0000E725 20D2                <1> 	and	dl, dl
  6337                              <1> 		; tstb (r2)+ / is queue empty?
  6338 0000E727 740A                <1>        	jz	short putlu_1
  6339                              <1> 		; beq 1f / yes, branch
  6340 0000E729 8A13                <1> 	mov 	dl, [ebx] ; 12/09/2015
  6341                              <1> 		; movb (r2),r3 / no, save the "last user" process number
  6342                              <1> 			     ; / in r3
  6343 0000E72B 8882[9F000300]      <1>        	mov	[edx+p.link-1], al
  6344                              <1> 		; movb r1,p.link-1(r3) / put pointer to user on 
  6345                              <1> 			     ; / "last users" link
  6346 0000E731 EB03                <1> 	jmp	short putlu_2
  6347                              <1> 		; br 2f /
  6348                              <1> putlu_1: ; 1:
  6349 0000E733 8843FF              <1> 	mov	[ebx-1], al
  6350                              <1>        		; movb r1,-1(r2) / user is only user; 
  6351                              <1> 			    ; / put process no. at beginning and at end
  6352                              <1> putlu_2: ; 2: 
  6353 0000E736 8803                <1> 	mov	[ebx], al
  6354                              <1>        		; movb r1,(r2) / user process in r1 is now the last entry
  6355                              <1> 			     ; / on the queue
  6356 0000E738 88C2                <1> 	mov	dl, al
  6357 0000E73A 88B2[9F000300]      <1>         mov     [edx+p.link-1], dh ; 0
  6358                              <1> 		; dec r2 / restore r2
  6359 0000E740 C3                  <1>         retn
  6360                              <1> 		; rts r0
  6361                              <1> 
  6362                              <1> sysver:
  6363                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
  6364 0000E741 C705[64030300]0002- <1> 	mov	dword [u.r0], 200h ; AH = major version, AL = minor version 
  6364 0000E749 0000                <1>
  6365 0000E74B E912E0FFFF          <1> 	jmp	sysret
  6366                              <1> 
  6367                              <1> 
  6368                              <1> syspri: ; change running priority (of the process)
  6369                              <1> 	; 21/05/2016
  6370                              <1> 	; 20/05/2026 - TRDOS 386 (TRDOS v2.0)
  6371                              <1> 	; INPUT ->
  6372                              <1> 	;	BL = priority level
  6373                              <1> 	;	   0 = low running priority (running on background)
  6374                              <1> 	;	   1 = normal/regular priority (running as regular)
  6375                              <1> 	;	   2 = high/event priority (running for event)
  6376                              <1> 	;	   >2 = invalid, it will accepted as 2 (event)
  6377                              <1> 	;	   0FFh = get/return current running priority only	
  6378                              <1> 	; OUTPUT -> 	
  6379                              <1> 	;	* if current [u.pri] < 2
  6380                              <1> 	;	  if BL input < 0FFh ->
  6381                              <1> 	;	     [u.pri] is updated as in BL input (0,1,2)
  6382                              <1> 	;	  if BL input = 0FFh -> AL = [u.pri] (current)
  6383                              <1> 	;	      
  6384                              <1> 	;	* if current [u.pri] = 2
  6385                              <1> 	;	  if BL input < 0FFh -> cf = 1 & AL = 2
  6386                              <1> 	;	  if BL input = 0FFh -> cf = 0 & AL = 2  
  6387                              <1> 	;	
  6388                              <1> 	;	NOTE: 	
  6389                              <1> 	;	If [u.pri] = 2, it can not be changed to 1 or 0;
  6390                              <1> 	;	because, run queue of the running process is unspecified
  6391                              <1> 	;	at this	stage. Process might be started by a timer event
  6392                              <1> 	;	or priority might be changed to high by previous
  6393                              <1> 	;	'syspri' system	call. In both cases, the process is in
  6394                              <1> 	;	'runq_normal' or 'runq_background' queue.
  6395                              <1> 	;	As result of this fact, when the [u.quant] time quantum
  6396                              <1> 	;	of the process is elapsed or 'sysrele' system call is
  6397                              <1> 	;	instructed by the process, 'tswap' ('tswitch') procedure
  6398                              <1> 	;	will be called (to 'swap' or 'switch' out the procedure)
  6399                              <1> 	;	and it will not call 'putlu' to add the (stopping)
  6400                              <1> 	;	process to relevant run queue when [u.pri] = 2.
  6401                              <1> 	;	(Otherwise, it would be possible to add process to
  6402                              <1> 	;	a run queue while it is already in a run queue, wrongly.)
  6403                              <1>   	;
  6404                              <1> 	;	If [u.pri]< 2, 'tswap/tswitch' procedure will call 
  6405                              <1> 	;	'putlu' to add process to relevant run queue
  6406                              <1> 	;	according to [u.pri] value. ('runq_normal' for 1, 
  6407                              <1> 	;	'runq_background' for 0).
  6408                              <1> 	;
  6409                              <1> 	;	If BL input >= 2 and < 0FFh while [u.pri] < 2,
  6410                              <1> 	;	process will be added to 'runq_normal' queue and
  6411                              <1> 	;	[u.pri] will be set to 2. (in 'syspri' system call)
  6412                              <1> 	;
  6413                              <1> 
  6414 0000E750 29C0                <1> 	sub	eax, eax ; 0
  6415 0000E752 A3[C8030300]        <1> 	mov	[u.error], eax
  6416                              <1> 
  6417 0000E757 A0[A9030300]        <1> 	mov	al, [u.pri]
  6418 0000E75C A3[64030300]        <1> 	mov	[u.r0], eax
  6419                              <1> 
  6420 0000E761 FEC3                <1> 	inc	bl
  6421 0000E763 0F84F9DFFFFF        <1> 	jz	sysret ; 0FFh -> 0, get priority level
  6422                              <1> 	
  6423 0000E769 3C02                <1> 	cmp	al, 2
  6424 0000E76B 0F83D1DFFFFF        <1> 	jnb	error ; CF = 1 & AL = 2 (& last error = 0)
  6425                              <1> 
  6426 0000E771 FECB                <1> 	dec	bl
  6427 0000E773 80FB02              <1> 	cmp	bl, 2
  6428 0000E776 7602                <1> 	jna	short syspri_1
  6429 0000E778 B302                <1> 	mov	bl, 2
  6430                              <1> syspri_1:
  6431 0000E77A 881D[A9030300]      <1> 	mov	[u.pri], bl
  6432 0000E780 80FB02              <1> 	cmp	bl, 2
  6433 0000E783 0F82D9DFFFFF        <1>         jb      sysret
  6434                              <1> 
  6435                              <1> 	; here...
  6436                              <1> 	; Priority of current process has been changed to high
  6437                              <1> 	; ('run for event') but current process will be added to
  6438                              <1> 	; 'run as normal' queue. ('run for event' high priority
  6439                              <1> 	; queue is under control of timer -& RTC- interrupt only!) 
  6440                              <1> 	;
  6441                              <1> 	; (Otherwise, process can fall into black hole!
  6442                              <1> 	; e.g. if it is not in waiting list and it has not got 
  6443                              <1> 	; a timer event and it is not in a run queue!
  6444                              <1> 	; Because, when [u.pri] is 2, 'tswap/tswitch' will not 
  6445                              <1> 	; add the stopping process to a run queue.)
  6446                              <1> 
  6447 0000E789 A0[B3030300]        <1> 	mov	al, [u.uno]
  6448 0000E78E BB[54030300]        <1> 	mov	ebx, runq_normal ; normal priority !
  6449                              <1> 				 ; [u.pri] is set to high
  6450                              <1> 				 ; but 'runq_event' queue is set
  6451                              <1> 				 ; only by the kernel's timer
  6452                              <1> 				 ; event function (timer interrupt). 
  6453 0000E793 E889FFFFFF          <1> 	call	putlu
  6454 0000E798 E9C5DFFFFF          <1> 	jmp	sysret
  6455                              <1> 
  6456                              <1> cpass: ; / get next character from user area of core and put it in AL (r1)
  6457                              <1> 	; 02/05/2016 - TRDOS 386 (TRDOS v2.0)
  6458                              <1> 	; 19/05/2015 - 18/10/2015 (Retro UNIX 386 v1)
  6459                              <1> 	; 14/08/2013 - 20/09/2013 (Retro UNIX 8086 v1)
  6460                              <1> 	; INPUTS -> 
  6461                              <1> 	;     [u.base] = virtual address in user area
  6462                              <1> 	;     [u.count] = byte count (max.)
  6463                              <1> 	;     [u.pcount] = byte count in page (0 = reset)		
  6464                              <1> 	; OUTPUTS -> 
  6465                              <1> 	;     AL = the character which is pointed by [u.base]
  6466                              <1> 	;     zf = 1 -> transfer count has been completed	
  6467                              <1>         ;
  6468                              <1> 	; ((Modified registers:  EAX, EDX, ECX))
  6469                              <1> 	;
  6470 0000E79D 833D[88030300]00    <1> 	cmp 	dword [u.count], 0  ; have all the characters been transferred
  6471                              <1> 			    	    ; i.e., u.count, # of chars. left
  6472 0000E7A4 763F                <1> 	jna	short cpass_3	    ; to be transferred = 0?) yes, branch
  6473 0000E7A6 FF0D[88030300]      <1> 	dec	dword [u.count]	    ; no, decrement u.count
  6474                              <1>         ; 19/05/2015 
  6475                              <1> 	;(Retro UNIX 386 v1 - translation from user's virtual address
  6476                              <1> 	;		      to physical address
  6477 0000E7AC 66833D[C4030300]00  <1> 	cmp	word [u.pcount], 0 ; byte count in page = 0 (initial value)
  6478                              <1> 			     ; 1-4095 --> use previous physical base address
  6479                              <1> 			     ; in [u.pbase]
  6480 0000E7B4 770E                <1> 	ja	short cpass_1
  6481 0000E7B6 833D[BC030300]00    <1> 	cmp     dword [u.ppgdir], 0 ; is the caller os kernel
  6482 0000E7BD 7427                <1>         je      short cpass_k       ; (sysexec, '/etc/init') ?  (MainProg)
  6483 0000E7BF E858FDFFFF          <1> 	call	trans_addr_r
  6484                              <1> cpass_1:
  6485 0000E7C4 66FF0D[C4030300]    <1> 	dec	word [u.pcount]
  6486                              <1> cpass_2: 
  6487 0000E7CB 8B15[C0030300]      <1> 	mov	edx, [u.pbase]
  6488 0000E7D1 8A02                <1> 	mov	al, [edx]	; take the character pointed to 
  6489                              <1> 				; by u.base and put it in r1
  6490 0000E7D3 FF05[8C030300]      <1> 	inc	dword [u.nread] ; increment no. of bytes transferred
  6491 0000E7D9 FF05[84030300]      <1> 	inc	dword [u.base]  ; increment the buffer address to point to the
  6492                              <1> 			        ; next byte
  6493 0000E7DF FF05[C0030300]      <1> 	inc	dword [u.pbase]
  6494                              <1> cpass_3:
  6495 0000E7E5 C3                  <1> 	retn
  6496                              <1> cpass_k:
  6497                              <1> 	; 02/07/2015
  6498                              <1> 	; The caller is os kernel 
  6499                              <1> 	; (get sysexec arguments from kernel's memory space)
  6500 0000E7E6 8B1D[84030300]      <1> 	mov	ebx, [u.base]
  6501 0000E7EC 66C705[C4030300]00- <1>         mov     word [u.pcount], PAGE_SIZE ; 4096
  6501 0000E7F4 10                  <1>
  6502 0000E7F5 891D[C0030300]      <1> 	mov	[u.pbase], ebx
  6503 0000E7FB EBCE                <1> 	jmp	short cpass_2
  6504                              <1> 
  6505                              <1> transfer_to_user_buffer: ; fast transfer
  6506                              <1> 	; 27/05/2016
  6507                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  6508                              <1> 	;
  6509                              <1> 	; INPUT ->
  6510                              <1> 	;	ESI = source address in system space
  6511                              <1> 	;	EDI = user's buffer address
  6512                              <1> 	;	ECX = transfer (byte) count
  6513                              <1> 	;	[u.pgdir] = user's page directory
  6514                              <1> 	; OUTPUT ->
  6515                              <1> 	;	ECX = actual transfer count
  6516                              <1> 	;	cf = 1 -> error
  6517                              <1> 	;	[u.count] = remain byte count
  6518                              <1> 	;
  6519                              <1> 	; Modified registers: eax, ecx
  6520                              <1> 	;
  6521                              <1> 
  6522 0000E7FD 21C9                <1> 	and	ecx, ecx
  6523 0000E7FF 743B                <1> 	jz	short ttub_4
  6524                              <1> 
  6525 0000E801 890D[88030300]      <1> 	mov	[u.count], ecx
  6526                              <1> 	
  6527 0000E807 57                  <1> 	push	edi
  6528 0000E808 56                  <1> 	push	esi
  6529 0000E809 53                  <1> 	push	ebx
  6530 0000E80A 52                  <1> 	push	edx
  6531 0000E80B 51                  <1> 	push	ecx
  6532                              <1> 
  6533 0000E80C 89FB                <1> 	mov	ebx, edi
  6534 0000E80E 81C300004000        <1> 	add	ebx, CORE ; 27/05/2016
  6535                              <1> ttub_1:
  6536                              <1> 	; ebx = virtual (linear) address
  6537                              <1> 	; [u.pgdir] = user's page directory
  6538 0000E814 E8D96AFFFF          <1>        	call	get_physical_addr_x ; get physical address
  6539 0000E819 7222                <1> 	jc	short ttub_5
  6540                              <1> 	; eax = physical address 
  6541                              <1> 	; ecx = remain byte count in page (1-4096)
  6542 0000E81B 89C7                <1> 	mov	edi, eax
  6543 0000E81D A1[88030300]        <1> 	mov	eax, [u.count]
  6544 0000E822 39C1                <1> 	cmp	ecx, eax
  6545 0000E824 7602                <1> 	jna	short ttub_2
  6546 0000E826 89C1                <1> 	mov	ecx, eax
  6547                              <1> ttub_2:	
  6548 0000E828 29C8                <1> 	sub	eax, ecx
  6549 0000E82A 01CB                <1> 	add	ebx, ecx
  6550 0000E82C F3A4                <1> 	rep	movsb
  6551 0000E82E A3[88030300]        <1> 	mov	[u.count], eax
  6552 0000E833 09C0                <1> 	or	eax, eax
  6553 0000E835 75DD                <1> 	jnz	short ttub_1
  6554                              <1> ttub_retn:
  6555                              <1> tfub_retn:
  6556 0000E837 59                  <1> 	pop	ecx ; transfer count = actual transfer count
  6557                              <1> ttub_3:
  6558 0000E838 5A                  <1> 	pop	edx
  6559 0000E839 5B                  <1> 	pop	ebx
  6560 0000E83A 5E                  <1> 	pop	esi
  6561 0000E83B 5F                  <1> 	pop	edi
  6562                              <1> ttub_4:
  6563 0000E83C C3                  <1> 	retn
  6564                              <1> ttub_5:
  6565 0000E83D 59                  <1> 	pop	ecx
  6566 0000E83E 2B0D[88030300]      <1> 	sub	ecx, [u.count] ; actual transfer count
  6567 0000E844 F9                  <1> 	stc
  6568 0000E845 EBF1                <1> 	jmp	short ttub_3
  6569                              <1> 
  6570                              <1> transfer_from_user_buffer: ; fast transfer
  6571                              <1> 	; 27/05/2016
  6572                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  6573                              <1> 	;
  6574                              <1> 	; INPUT ->
  6575                              <1> 	;	ESI = user's buffer address
  6576                              <1> 	;	EDI = destination address in system space
  6577                              <1> 	;	ECX = transfer (byte) count
  6578                              <1> 	;	[u.pgdir] = user's page directory
  6579                              <1> 	; OUTPUT ->
  6580                              <1> 	;	ecx = actual transfer count
  6581                              <1> 	;	cf = 1 -> error
  6582                              <1> 	;	[u.count] = remain byte count
  6583                              <1> 	;
  6584                              <1> 	; Modified registers: eax, ecx
  6585                              <1> 	;
  6586                              <1> 
  6587 0000E847 21C9                <1> 	and	ecx, ecx
  6588                              <1> 	;jz	short tfub_4
  6589 0000E849 74F1                <1> 	jz	short ttub_4
  6590                              <1> 
  6591 0000E84B 890D[88030300]      <1> 	mov	[u.count], ecx
  6592                              <1> 	
  6593 0000E851 57                  <1> 	push	edi
  6594 0000E852 56                  <1> 	push	esi
  6595 0000E853 53                  <1> 	push	ebx
  6596 0000E854 52                  <1> 	push	edx
  6597 0000E855 51                  <1> 	push	ecx
  6598                              <1> 
  6599 0000E856 89F3                <1> 	mov	ebx, esi
  6600 0000E858 81C300004000        <1> 	add	ebx, CORE ; 27/05/2016
  6601                              <1> tfub_1:
  6602                              <1> 	; ebx = virtual (linear) address
  6603                              <1> 	; [u.pgdir] = user's page directory
  6604 0000E85E E88F6AFFFF          <1>        	call	get_physical_addr_x ; get physical address
  6605                              <1> 	;jc	short tfub_5
  6606 0000E863 72D8                <1> 	jc	short ttub_5
  6607                              <1> 	; eax = physical address 
  6608                              <1> 	; ecx = remain byte count in page (1-4096)
  6609 0000E865 89C6                <1> 	mov	esi, eax
  6610 0000E867 A1[88030300]        <1> 	mov	eax, [u.count]
  6611 0000E86C 39C1                <1> 	cmp	ecx, eax
  6612 0000E86E 7602                <1> 	jna	short tfub_2
  6613 0000E870 89C1                <1> 	mov	ecx, eax
  6614                              <1> tfub_2:	
  6615 0000E872 29C8                <1> 	sub	eax, ecx
  6616 0000E874 01CB                <1> 	add	ebx, ecx
  6617 0000E876 F3A4                <1> 	rep	movsb
  6618 0000E878 A3[88030300]        <1> 	mov	[u.count], eax
  6619 0000E87D 09C0                <1> 	or	eax, eax
  6620 0000E87F 75DD                <1> 	jnz	short tfub_1
  6621                              <1> 
  6622 0000E881 EBB4                <1> 	jmp	short tfub_retn
  6623                              <1> 
  6624                              <1> ;tfub_retn:
  6625                              <1> ;	pop	ecx ; transfer count = actual transfer count
  6626                              <1> ;tfub_3:
  6627                              <1> ;	pop	edx
  6628                              <1> ;	pop	ebx
  6629                              <1> ;	pop	esi
  6630                              <1> ;	pop	edi
  6631                              <1> ;tfub_4:
  6632                              <1> ;	retn
  6633                              <1> ;tfub_5:
  6634                              <1> ;	pop	ecx
  6635                              <1> ;	sub	ecx, [u.count] ; actual transfer count
  6636                              <1> ;	stc
  6637                              <1> ;	jmp	short tfub_3
  6638                              <1> 
  6639                              <1> sysfff: ; <Find First File>
  6640                              <1> 	; 17/10/2016
  6641                              <1> 	; 16/10/2016
  6642                              <1> 	; 15/10/2016 TRDOS 386 (TRDOS v2.0) feature only ! 
  6643                              <1> 	;           -derived from TRDOS v1.0, INT_21H.ASM-
  6644                              <1> 	;            ("loc_INT21h_find_first_file")
  6645                              <1> 	; TRDOS 8086 (v1.0)
  6646                              <1>         ; 	07/08/2011 
  6647                              <1>         ;	Find First File
  6648                              <1> 	;	INPUT:
  6649                              <1>         ;	    CX= Attributes
  6650                              <1>         ;	    DS:DX= Pointer to filename
  6651                              <1> 	;	MSDOS OUTPUT:
  6652                              <1> 	;	    DTA: (Default address: PSP offset 80h)
  6653                              <1> 	;	    Offset  Descrription
  6654                              <1> 	;	    0	    Reserved for use find next file
  6655                              <1> 	;	    21	    Attribute of file found
  6656                              <1> 	;	    22	    Time stamp of file
  6657                              <1> 	;	    24	    Date stamp of file
  6658                              <1> 	;	    26	    File size in bytes
  6659                              <1> 	;	    30	    Filename and extension (zero terminated)
  6660                              <1> 	;	If cf = 1:
  6661                              <1> 	;	    Error Codes: (in AX)
  6662                              <1> 	;	    	2 - File not found
  6663                              <1> 	;	       18 - No more files  			
  6664                              <1>         ;
  6665                              <1> 	; TRDOS 386 (v2.0) 
  6666                              <1> 	; 15/10/2016
  6667                              <1> 	;	
  6668                              <1>         ; INPUT ->
  6669                              <1>         ;	   CL = File attributes
  6670                              <1> 	;     	      bit 0 (1) - Read only file (R)
  6671                              <1> 	;             bit 1 (1) - Hidden file (H)
  6672                              <1>         ;             bit 2 (1) - System file (R)
  6673                              <1> 	;             bit 3 (1) - Volume label/name (V)
  6674                              <1>         ;             bit 4 (1) - Subdirectory (D)
  6675                              <1> 	;	      bit 5 (1) - File has been archived (A)
  6676                              <1> 	;	   CH = 0 -> Return basic parameters (24 bytes)
  6677                              <1> 	;	   CH > 0 -> Return FindFile structure/table (128 bytes)
  6678                              <1>         ;          EBX = Pointer to filename (ASCIIZ) -path-
  6679                              <1> 	;	   EDX = File parameters buffer address
  6680                              <1> 	;		(buffer size = 24 bytes if CH input = 0)
  6681                              <1> 	;		(buffer size = 128 bytes if CH input > 0)
  6682                              <1> 	;		 
  6683                              <1> 	; OUTPUT ->
  6684                              <1> 	;	   EAX = 0 if CH input > 0
  6685                              <1> 	;	   EAX = First cluster number of file if CH input = 0	
  6686                              <1> 	;	   EDX = File parameters table/structure address
  6687                              <1> 	;	   Basic Parameters:
  6688                              <1> 	;		Offset  Description
  6689                              <1> 	;		------	---------------
  6690                              <1> 	;		0	File Attributes
  6691                              <1> 	;		1	Ambiguous filename chars are used sign
  6692                              <1> 	;			(0 = filename fits exactly with request)
  6693                              <1> 	;			(>0 = ambiguous filename chars are used)
  6694                              <1> 	;	      	2	Time stamp of file
  6695                              <1> 	;		4	Date stamp of file
  6696                              <1> 	;		6	File size in bytes
  6697                              <1> 	;		10	Short Filename (ASCIIZ, max. 13 bytes)
  6698                              <1> 	;		23	Longname Length (1-255) if existing 
  6699                              <1> 	;  
  6700                              <1> 	;          cf = 1 -> Error code in AL
  6701                              <1> 	;
  6702                              <1> 	; Modified Registers: EAX (at the return of system call)
  6703                              <1> 	;  
  6704                              <1> 	; TR-DOS FindFile (FFF) Structure (128 bytes):
  6705                              <1> 	; 09/10/2011 (DIR.ASM) - 10/02/2016 (trdoskx.s)
  6706                              <1> 	;	
  6707                              <1> 	; Offset	Parameter		Size
  6708                              <1> 	; ------	------------------	-------- 
  6709                              <1> 	; 0		FindFile_Drv		1 byte
  6710                              <1> 	; 1		FindFile_Directory	65 bytes
  6711                              <1> 	; 66		FindFile_Name		13 bytes
  6712                              <1> 	; 79		FindFile_LongNameEntryLength 1 byte
  6713                              <1> 	;Above 80 bytes form
  6714                              <1> 	;TR-DOS Source/Destination File FullName Format/Structure
  6715                              <1> 	; 80		FindFile_AttributesMask 1 word
  6716                              <1> 	; 82		FindFile_DirEntry	32 bytes (*)
  6717                              <1> 	; 114		FindFile_DirFirstCluster 1 double word
  6718                              <1> 	; 118		FindFile_DirCluster	1 double word
  6719                              <1> 	; 122		FindFile_DirEntryNumber 1 word
  6720                              <1> 	; 124		FindFile_MatchCounter	1 word
  6721                              <1> 	; 126		FindFile_Reserved	1 word
  6722                              <1>    	; (*) MS-DOS, FAT 12-16-32 classic directory entry (32 bytes)
  6723                              <1> 
  6724                              <1> 	;mov	[u.namep], ebx
  6725                              <1> 	; 16/10/2016
  6726 0000E883 8915[70650100]      <1> 	mov	[FFF_UBuffer], edx
  6727 0000E889 66890D[75650100]    <1> 	mov	[FFF_Attrib], cx ; [FFF_RType] = ch
  6728                              <1> 		    ; Attributes in CL, return data type in CH
  6729 0000E890 89DE                <1> 	mov	esi, ebx
  6730                              <1> 	; file name is forced, change directory as temporary
  6731                              <1> 	;mov	ax, 1
  6732                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
  6733                              <1> 	;call	set_working_path 
  6734 0000E892 E8E8130000          <1> 	call	set_working_path_x ; 17/10/2016	
  6735 0000E897 731D                <1> 	jnc	short sysfff_0
  6736                              <1>  
  6737 0000E899 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
  6738 0000E89B 7505                <1> 	jnz	short sysfff_err
  6739                              <1> 
  6740                              <1> 	; eax = 0
  6741 0000E89D B80C000000          <1> 	mov	eax, ERR_DIR_NOT_FOUND ; Directory not found !
  6742                              <1> sysfff_err:
  6743 0000E8A2 A3[64030300]        <1> 	mov	[u.r0], eax
  6744 0000E8A7 A3[C8030300]        <1> 	mov	[u.error], eax
  6745 0000E8AC E8A3140000          <1>         call 	reset_working_path
  6746 0000E8B1 E98CDEFFFF          <1> 	jmp	error
  6747                              <1> 
  6748                              <1> sysfff_0:
  6749                              <1> 	;sub	ah, ah ; ah = 0
  6750 0000E8B6 8A0424              <1> 	mov	al, [esp]
  6751 0000E8B9 08C0                <1> 	or	al, al
  6752 0000E8BB 7412                <1> 	jz	short sysfff_2
  6753 0000E8BD B410                <1> 	mov	ah, 10h
  6754 0000E8BF A808                <1> 	test	al, 08h
  6755 0000E8C1 7503                <1> 	jnz	short sysfff_1
  6756 0000E8C3 80CC08              <1> 	or	ah, 08h
  6757                              <1> sysfff_1:
  6758 0000E8C6 2410                <1> 	and	al, 10h ; Directory
  6759 0000E8C8 7405                <1> 	jz	short sysfff_2
  6760 0000E8CA 80E408              <1> 	and	ah, 08h
  6761 0000E8CD 30C0                <1> 	xor	al, al ; When a directory is searched,
  6762                              <1> 		       ; filename will be returned even if
  6763                              <1> 		       ; it is not a directory!
  6764                              <1> 		       ; Because: (in order to prevent
  6765                              <1> 		       ; creating a dir with existing file name)
  6766                              <1> 		       ; Dir and file names must not be same!
  6767                              <1> 		       ; (return attribute must be checked)  	  	 	
  6768                              <1> sysfff_2:
  6769                              <1> 	; AX = Attributes mask 
  6770                              <1> 		; AL = AND mask (result must be equal to AL)
  6771                              <1> 		; AH = Negative AND mask (result must be ZERO)			
  6772                              <1>  	; ESI = FindFile_Name address
  6773                              <1> 
  6774 0000E8CF E8139AFFFF          <1> 	call	find_first_file
  6775 0000E8D4 72CC                <1> 	jc	short sysfff_err ; eax = 2 (File not found !)
  6776                              <1> 
  6777                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
  6778                              <1> 	; EDI = Directory Buffer Directory Entry Location
  6779                              <1> 	; EAX = File Size
  6780                              <1> 	;  BL = Attributes of The File/Directory
  6781                              <1> 	;  BH = Long Name Yes/No Status (>0 is YES)
  6782                              <1> 	;  DX > 0 : Ambiguous filename chars are used
  6783                              <1> 
  6784                              <1> sysfff_3:
  6785                              <1> 	; 16/10/2016
  6786 0000E8D6 668B0D[75650100]    <1> 	mov	cx, [FFF_Attrib]
  6787                              <1> 	; Attribs in CL, return data type in CH
  6788                              <1> 
  6789                              <1> 	;or	cl, cl
  6790                              <1> 	;jz	short sysfff_4 ; 0 = No filter
  6791 0000E8DD 80F1FF              <1> 	xor	cl, 0FFh
  6792 0000E8E0 20D9                <1> 	and	cl, bl
  6793 0000E8E2 7409                <1> 	jz	short sysfff_4
  6794                              <1> 
  6795                              <1> 	;mov	eax, 2 ; 'file not found !' error
  6796                              <1> 	;jmp	short sysfff_err_1
  6797                              <1> 
  6798                              <1> 	; 16/10/2016
  6799 0000E8E4 E8AD9AFFFF          <1> 	call	find_next_file
  6800 0000E8E9 72B7                <1> 	jc	short sysfff_err ; eax = 12 (no more files !)
  6801 0000E8EB EBE9                <1> 	jmp	short sysfff_3
  6802                              <1> 
  6803                              <1> sysfff_4:
  6804 0000E8ED 20ED                <1> 	and	ch, ch ; [FFF_RType]
  6805 0000E8EF 7412                <1> 	jz	short sysfff_5
  6806 0000E8F1 B980000000          <1> 	mov	ecx, 128 ; ; transfer length
  6807 0000E8F6 880D[74650100]      <1> 	mov	[FFF_Valid], cl
  6808                              <1> sysfnf_11:
  6809 0000E8FC BE[26620100]        <1> 	mov	esi, FindFile_Drv
  6810 0000E901 EB44                <1> 	jmp	short sysfff_6	
  6811                              <1> sysfff_5:
  6812                              <1> 	;mov	esi, FindFile_DirEntry
  6813 0000E903 B918000000          <1> 	mov	ecx, 24  ; transfer length
  6814 0000E908 880D[74650100]      <1> 	mov	[FFF_Valid], cl
  6815                              <1> sysfnf_12:
  6816 0000E90E BF[306A0100]        <1> 	mov	edi, DTA ; FFF data transfer address
  6817                              <1> 	;mov	al, [esi+DirEntry_Attr] ; 11
  6818 0000E913 88D8                <1> 	mov	al, bl ; File/Dir Attributes
  6819 0000E915 887F17              <1> 	mov	[edi+23], bh ; Longname length (0= none)
  6820 0000E918 AA                  <1> 	stosb
  6821 0000E919 88D0                <1> 	mov	al, dl ; DL is for '?'
  6822 0000E91B 00F0                <1> 	add	al, dh ; DH is for '*'
  6823                              <1> 	; AL > 0 if ambiguous file name wildcards are used
  6824 0000E91D AA                  <1> 	stosb
  6825 0000E91E 8B4616              <1> 	mov	eax, [esi+DirEntry_WrtTime] ; 22	
  6826 0000E921 AB                  <1>         stosd	; DirEntry_WrtTime & DirEntry_WrtDate
  6827 0000E922 8B461C              <1>         mov	eax, [esi+DirEntry_FileSize] ; 28
  6828 0000E925 AB                  <1>         stosd
  6829 0000E926 668B4614            <1> 	mov	ax, [esi+DirEntry_FstClusHI] ; 20
  6830 0000E92A 66C1E010            <1> 	shl	ax, 16
  6831 0000E92E 668B461A            <1> 	mov	ax, [esi+DirEntry_FstClusLO] ; 26 
  6832 0000E932 A3[64030300]        <1> 	mov	[u.r0], eax ; First Cluster
  6833                              <1> 
  6834                              <1>         ;mov	esi, FindFile_DirEntry
  6835 0000E937 E855140000          <1> 	call	get_file_name
  6836                              <1> 
  6837 0000E93C 8A0D[74650100]      <1> 	mov	cl, [FFF_Valid]
  6838 0000E942 BE[306A0100]        <1>        	mov	esi, DTA ; FFF data transfer address
  6839                              <1> sysfff_6:
  6840 0000E947 8B3D[70650100]      <1> 	mov	edi, [FFF_UBuffer] ; user's buffer address (edx)
  6841 0000E94D E8ABFEFFFF          <1> 	call	transfer_to_user_buffer
  6842                              <1> 
  6843 0000E952 890D[64030300]      <1> 	mov	[u.r0], ecx ; actual transfer count
  6844 0000E958 E8F7130000          <1>         call 	reset_working_path
  6845 0000E95D E900DEFFFF          <1> 	jmp	sysret
  6846                              <1> 
  6847                              <1> sysfnf: ; <Find Next File>
  6848                              <1> 	; 16/10/2016 TRDOS 386 (TRDOS v2.0) feature only ! 
  6849                              <1> 	;           -derived from TRDOS v1.0, INT_21H.ASM-
  6850                              <1> 	;            ("loc_INT21h_find_next_file")
  6851                              <1> 	; TRDOS 8086 (v1.0)
  6852                              <1>         ; 	07/08/2011 
  6853                              <1>         ;	Find First File
  6854                              <1> 	;	INPUT:
  6855                              <1>         ;	    none
  6856                              <1> 	;	MSDOS OUTPUT:
  6857                              <1> 	;	    DTA: (Default address: PSP offset 80h)
  6858                              <1> 	;	    Offset  Descrription
  6859                              <1> 	;	    0	    Reserved for use find next file
  6860                              <1> 	;	    21	    Attribute of file found
  6861                              <1> 	;	    22	    Time stamp of file
  6862                              <1> 	;	    24	    Date stamp of file
  6863                              <1> 	;	    26	    File size in bytes
  6864                              <1> 	;	    30	    Filename and extension (zero terminated)
  6865                              <1> 	;	If cf = 1:
  6866                              <1> 	;	    Error Codes: (in AX)
  6867                              <1> 	;	       18 - No more files  			
  6868                              <1>         ;
  6869                              <1> 	; TRDOS 386 (v2.0) 
  6870                              <1> 	; 16/10/2016
  6871                              <1> 	;	
  6872                              <1>         ; INPUT ->
  6873                              <1>        	; 	   none
  6874                              <1> 	; OUTPUT ->
  6875                              <1> 	;	   EAX = 0 if CH input of 'Find First File' > 0
  6876                              <1> 	;	   EAX = First cluster number of file
  6877                              <1> 	;		 if CH input of 'Find First File' = 0	
  6878                              <1> 	;	   EDX = File parameters table/structure address
  6879                              <1> 	;
  6880                              <1> 	;          cf = 1 -> Error code in AL
  6881                              <1> 	;
  6882                              <1>  	; Modified Registers: EAX (at the return of system call)	
  6883                              <1> 
  6884                              <1> 	;	
  6885                              <1> 	; Note: If byte [FFF_Valid] = 0
  6886                              <1> 	;	'sysfnf' will return with 'no more files' error.
  6887                              <1> 	;	If byte [FFF_Valid] = 24
  6888                              <1> 	;	'sysfnf' will return with 32 bytes basic parameters
  6889                              <1> 	;	at the address which is in EDX.
  6890                              <1> 	;	If byte [FFF_Valid] = 128
  6891                              <1> 	;	'sysfnf' will return with 128 bytes Find File 
  6892                              <1> 	;	Structure/Table at the address which is in EDX.
  6893                              <1> 	
  6894 0000E962 803D[74650100]00    <1> 	cmp	byte [FFF_Valid], 0
  6895 0000E969 7714                <1> 	ja	short stsfnf_0
  6896                              <1>  	; 'no more files !' error 
  6897 0000E96B B80C000000          <1> 	mov	eax, ERR_NO_MORE_FILES ; 12
  6898 0000E970 A3[64030300]        <1> 	mov	[u.r0], eax
  6899 0000E975 A3[C8030300]        <1> 	mov	[u.error], eax
  6900 0000E97A E9C3DDFFFF          <1> 	jmp	error
  6901                              <1> stsfnf_0:
  6902                              <1> 	;cmp	byte [FFF_Valid], 128
  6903                              <1> 	;je	short stsfnf_1
  6904                              <1> 	;cmp	byte [FFF_Valid], 24
  6905                              <1> 	;je	short stsfnf_1
  6906                              <1> 	;mov	[FFF_Valid], 24 ; Default
  6907                              <1> stsfnf_1:
  6908 0000E97F 0FB61D[86590100]    <1> 	movzx	ebx, byte [Current_Drv]
  6909 0000E986 66891D[7A650100]    <1> 	mov	[SWP_DRV], bx
  6910 0000E98D 8A15[26620100]      <1> 	mov	dl, [FindFile_Drv]
  6911 0000E993 38DA                <1> 	cmp	dl, bl
  6912 0000E995 750B                <1> 	jne	short stsfnf_2
  6913 0000E997 86FB                <1> 	xchg	bh, bl
  6914 0000E999 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  6915 0000E99E 01DE                <1> 	add	esi, ebx
  6916 0000E9A0 EB0D                <1> 	jmp	short sysfnf_3
  6917                              <1> 
  6918                              <1> stsfnf_2:
  6919 0000E9A2 FE05[7B650100]      <1> 	inc	byte [SWP_DRV_chg]
  6920                              <1> 
  6921 0000E9A8 E89785FFFF          <1> 	call	change_current_drive
  6922 0000E9AD 7245                <1> 	jc	short sysfnf_err_1 ; read error ! 
  6923                              <1> 				   ; (do not stop, because
  6924                              <1> 				   ; we don't have a
  6925                              <1> 				   ; 'no more files'
  6926                              <1> 				   ; -file not found- error,	
  6927                              <1> 				   ; next sysfnf system call
  6928                              <1> 				   ; may solve the problem,
  6929                              <1> 				   ; after re-placing the disk)				
  6930                              <1> sysfnf_3:
  6931 0000E9AF A1[9C620100]        <1> 	mov	eax, [FindFile_DirCluster]
  6932 0000E9B4 21C0                <1> 	and	eax, eax
  6933 0000E9B6 7550                <1> 	jnz	short sysfnf_6
  6934                              <1>         
  6935 0000E9B8 803D[85590100]02    <1> 	cmp	byte [Current_FATType], 2
  6936 0000E9BF 772C                <1> 	ja	short sysfnf_err_0 ; invalid, we neeed to stop !?
  6937 0000E9C1 803D[85590100]01    <1> 	cmp	byte [Current_FATType], 1
  6938 0000E9C8 7223                <1> 	jb	short sysfnf_err_0 ; invalid, we neeed to stop !?
  6939                              <1> 
  6940 0000E9CA 3805[AC600100]      <1> 	cmp	byte [DirBuff_ValidData], al ; 0
  6941 0000E9D0 7608                <1> 	jna	short sysfnf_4 
  6942                              <1> 
  6943 0000E9D2 3B05[B1600100]      <1> 	cmp	eax, [DirBuff_Cluster] ; 0 ?
  6944 0000E9D8 745E                <1> 	je	short sysfnf_9
  6945                              <1> 
  6946                              <1> 	;cmp	byte [Current_Dir_Level], 0
  6947                              <1>         ;ja	short sysfnf_4  
  6948                              <1>         ;jna	short sysfnf_9 
  6949                              <1> 
  6950                              <1> sysfnf_4:
  6951 0000E9DA FE05[7B650100]      <1> 	inc	byte [SWP_DRV_chg]
  6952 0000E9E0 E842D3FFFF          <1> 	call 	load_FAT_root_directory
  6953 0000E9E5 7351                <1> 	jnc	short sysfnf_9
  6954                              <1> 	; eax = error code (17, 'drv not ready or read error')
  6955 0000E9E7 EB0B                <1> 	jmp	short sysfnf_err_1 ; read error ! (no FNF stop)
  6956                              <1> 				   ; (if you want, try again, 
  6957                              <1> 				   ;  after re-placing the disk)
  6958                              <1> sysfnf_5:	
  6959 0000E9E9 3C0C                <1> 	cmp	al, 12 ; 'no more files' error
  6960 0000E9EB 7507                <1> 	jne	short sysfnf_err_1 ; (no FNF stop -sysfnf will try
  6961                              <1> 				   ;  to read the directory again,
  6962                              <1> 				   ;  if the user calls sysfnf
  6963                              <1> 				   ;  just after this error return-)
  6964                              <1> 	; (FNF stop -sysfnf will not try
  6965                              <1> 	;  to read the directory again-)	
  6966                              <1> 
  6967                              <1> sysfnf_err_0:
  6968 0000E9ED C605[74650100]00    <1> 	mov	byte [FFF_Valid], 0 ; FNF stop sign
  6969                              <1> sysfnf_err_1:
  6970 0000E9F4 A3[64030300]        <1> 	mov	[u.r0], eax
  6971 0000E9F9 A3[C8030300]        <1> 	mov	[u.error], eax
  6972 0000E9FE E851130000          <1> 	call	reset_working_path
  6973 0000EA03 E93ADDFFFF          <1> 	jmp	error
  6974                              <1> 	  
  6975                              <1> sysfnf_6:
  6976 0000EA08 803D[AC600100]00    <1> 	cmp	byte [DirBuff_ValidData], 0
  6977 0000EA0F 7608                <1> 	jna	short sysfnf_7
  6978                              <1> 
  6979 0000EA11 3B05[B1600100]      <1> 	cmp	eax, [DirBuff_Cluster]
  6980 0000EA17 741F                <1> 	je	short sysfnf_9
  6981                              <1> 
  6982                              <1> sysfnf_7:
  6983 0000EA19 FE05[7B650100]      <1> 	inc	byte [SWP_DRV_chg]
  6984 0000EA1F 803D[85590100]01    <1> 	cmp	byte [Current_FATType], 1
  6985 0000EA26 7309                <1> 	jnb	short sysfnf_8
  6986                              <1> 
  6987                              <1> 	; Singlix (TRFS) File System 
  6988                              <1> 	; (access via compatibility buffer)
  6989 0000EA28 E8C2D3FFFF          <1> 	call	load_FS_sub_directory
  6990 0000EA2D 7309                <1> 	jnc	short sysfnf_9
  6991                              <1> 
  6992 0000EA2F EBC3                <1> 	jmp	short sysfnf_err_1 ; read error (no FNF stop)
  6993                              <1> 
  6994                              <1> sysfnf_8:
  6995 0000EA31 E87CD3FFFF          <1> 	call	load_FAT_sub_directory	 
  6996 0000EA36 72BC                <1> 	jc	short sysfnf_err_1 ; read error (no FNF stop)
  6997                              <1> 
  6998                              <1> sysfnf_9:
  6999 0000EA38 E85999FFFF          <1> 	call	find_next_file
  7000 0000EA3D 72AA                <1> 	jc	short sysfnf_5
  7001                              <1> 
  7002 0000EA3F A0[75650100]        <1> 	mov	al, [FFF_Attrib]
  7003                              <1> 	;or	al, al
  7004                              <1> 	;jz	short sysfnf_10 ; 0 = No filter
  7005 0000EA44 34FF                <1> 	xor	al, 0FFh
  7006 0000EA46 20D8                <1> 	and	al, bl
  7007 0000EA48 75EE                <1> 	jnz	short sysfnf_9 ; search for next file until
  7008                              <1> 			       ; an error return from
  7009                              <1> 			       ; find_next_file procedure	
  7010                              <1> sysfnf_10:
  7011 0000EA4A 0FB60D[74650100]    <1>         movzx	ecx, byte [FFF_Valid]
  7012 0000EA51 80F980              <1> 	cmp	cl, 128 ; complete FindFile structure/table 
  7013 0000EA54 0F84A2FEFFFF        <1> 	je	sysfnf_11
  7014                              <1> 	;cmp	cl, 24  ; basic parameters
  7015                              <1> 	;je	sysfnf_12       
  7016 0000EA5A E9AFFEFFFF          <1> 	jmp	sysfnf_12
  7017                              <1> 
  7018                              <1> writei:
  7019                              <1> 	; 26/10/2016
  7020                              <1> 	; 25/10/2016
  7021                              <1> 	; 23/10/2016
  7022                              <1> 	; 22/10/2016
  7023                              <1> 	; 19/10/2016 - TRDOS 386 (TRDOS v2.0)
  7024                              <1> 	; 19/05/2015 - 20/05/2015 (Retro UNIX 386 v1)
  7025                              <1> 	; 12/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  7026                              <1> 	;
  7027                              <1> 	; Write data to file with first cluster number in EAX
  7028                              <1> 	; 
  7029                              <1> 	; INPUTS ->
  7030                              <1> 	;    EAX - First cluster number of the file
  7031                              <1> 	;    EBX - File number (Open file index number)
  7032                              <1> 	;    u.count - byte count to be written
  7033                              <1> 	;    u.base - points to user buffer
  7034                              <1> 	;    u.fofp - points to dword with current file offset
  7035                              <1> 	;    i.size - file size
  7036                              <1> 	;    cdev - logical dos drive number of the file
  7037                              <1> 	; OUTPUTS ->
  7038                              <1> 	;    u.count - cleared
  7039                              <1> 	;    u.nread - accumulates total bytes passed back
  7040                              <1> 	;    i.size - new file size (if file byte offset overs file size)
  7041                              <1> 	;    u.fofp - points to u.off (with new offset value)	
  7042                              <1> 	;
  7043                              <1> 	; (Retro UNIX Prototype : 11/11/2012 - 18/11/2012, UNIXCOPY.ASM)
  7044                              <1> 	; ((Modified registers: eax, edx, ebx, ecx, esi, edi, ebp)) 	
  7045                              <1> 
  7046 0000EA5F 31C9                <1> 	xor	ecx, ecx
  7047 0000EA61 890D[8C030300]      <1> 	mov 	[u.nread], ecx  ; 0
  7048 0000EA67 66890D[C4030300]    <1> 	mov	[u.pcount], cx ; 19/05/2015
  7049 0000EA6E 390D[88030300]      <1> 	cmp 	[u.count], ecx
  7050 0000EA74 7701                <1> 	ja 	short writei_1 
  7051 0000EA76 C3                  <1> 	retn
  7052                              <1> writei_1:
  7053 0000EA77 881D[34650100]      <1> 	mov	[writei.ofn], bl ; Open file number
  7054 0000EA7D 880D[6F650100]      <1> 	mov	[setfmod], cl ; 0 ; reset 'update lm date&time' sign
  7055                              <1> dskw_0: 
  7056                              <1> 	; 26/10/2016
  7057                              <1> 	; 22/10/2016, 23/10/2016, 25/10/2016
  7058                              <1> 	; 19/10/2016 - TRDOS 386 (TRDOS v2.0)
  7059                              <1> 	; 31/05/2015 - 25/07/2015 (Retro UNIX 386 v1)
  7060                              <1> 	; 26/04/2013 - 20/09/2013 (Retro UNIX 8086 v1)
  7061                              <1> 	;
  7062                              <1> 	; 01/08/2013 (mkdir_w check)
  7063 0000EA83 E8D7000000          <1>  	call	mget_w
  7064                              <1> 	; eax = sector/block number
  7065                              <1> 
  7066 0000EA88 8B1D[74030300]      <1> 	mov     ebx, [u.fofp]
  7067 0000EA8E 8B13                <1> 	mov	edx, [ebx]
  7068 0000EA90 81E2FF010000        <1> 	and	edx, 1FFh  ; / test the lower 9 bits of the file offset
  7069 0000EA96 750C                <1> 	jnz	short dskw_1 ; / if its non-zero, branch
  7070                              <1> 			     ; if zero, file offset = 0,
  7071                              <1> 		       	     ; / 512, 1024,...(i.e., start of new block)
  7072 0000EA98 813D[88030300]0002- <1> 	cmp	dword [u.count], 512
  7072 0000EAA0 0000                <1>
  7073                              <1> 				; / if zero, is there enough data to fill
  7074                              <1> 				; / an entire block? (i.e., no. of
  7075 0000EAA2 7337                <1> 	jnb	short dskw_2 ; / bytes to be written greater than 512.? 
  7076                              <1> 			     ; / Yes, branch. Don't have to read block
  7077                              <1> dskw_1: ; in as no past info. is to be saved 
  7078                              <1> 	; (the entire block will be overwritten).
  7079                              <1> 	; 23/10/2016
  7080                              <1> 
  7081 0000EAA4 BB[94070300]        <1> 	mov	ebx, writei_buffer
  7082                              <1> 	; esi = logical dos drive description table address
  7083                              <1> 	; eax = sector number
  7084                              <1> 	; ebx = buffer address (in kernel's memory space)
  7085                              <1> 	; ecx = sector count
  7086 0000EAA9 B901000000          <1> 	mov	ecx, 1
  7087 0000EAAE E8A90D0000          <1> 	call	disk_read
  7088                              <1> 	;call	dskrd 	; / no, must retain old info.. 
  7089                              <1> 		       	; / Hence, read block 'r1' into an I/O buffer
  7090 0000EAB3 7326                <1> 	jnc	short dskw_2
  7091                              <1> 
  7092                              <1> 	; disk read error
  7093 0000EAB5 B811000000          <1> 	mov	eax, 17 ; drive not ready or READ ERROR !
  7094                              <1> dskw_err: ; jump from disk write error
  7095 0000EABA A3[64030300]        <1> 	mov	[u.r0], eax
  7096 0000EABF A3[C8030300]        <1> 	mov	[u.error], eax
  7097                              <1> 
  7098 0000EAC4 803D[6F650100]00    <1> 	cmp	byte [setfmod], 0
  7099 0000EACB 0F8671DCFFFF        <1> 	jna	error
  7100                              <1> 
  7101 0000EAD1 E8AF030000          <1> 	call	update_file_lmdt ; update last modif. date&time of the file
  7102                              <1> 	;mov	byte [setfmod], 0	
  7103                              <1> 
  7104 0000EAD6 E967DCFFFF          <1> 	jmp	error
  7105                              <1> 
  7106                              <1> dskw_2: ; 3:
  7107                              <1> 	; 23/10/2016
  7108 0000EADB C605[10650100]01    <1> 	mov	byte [writei.valid], 1 ; writei buffer contains valid data
  7109 0000EAE2 56                  <1> 	push	esi ; logical dos drive description table address
  7110                              <1> 	; EAX (r1) = block/sector number
  7111                              <1> 	;call	wslot
  7112                              <1> 		; jsr r0,wslot / set write and inhibit bits in I/O queue, 
  7113                              <1> 			   ; / proc. status=0, r5 points to 1st word of data
  7114 0000EAE3 803D[C6030300]00    <1> 	cmp	byte [u.kcall], 0
  7115 0000EAEA 770F                <1> 	ja	short dskw_4 ; zf=0 -> the caller is 'mkdir'
  7116                              <1> 	;
  7117 0000EAEC 66833D[C4030300]00  <1> 	cmp	word [u.pcount], 0
  7118 0000EAF4 7705                <1> 	ja	short dskw_4
  7119                              <1> dskw_3:
  7120                              <1> 	; [u.base] = virtual address to transfer (as source address)
  7121 0000EAF6 E821FAFFFF          <1> 	call	trans_addr_r ; translate virtual address to physical (r)
  7122                              <1> dskw_4:
  7123 0000EAFB BB[94070300]        <1> 	mov	ebx, writei_buffer
  7124                              <1> 	; EBX (r5) = system (I/O) buffer address
  7125 0000EB00 E883FAFFFF          <1> 	call	sioreg
  7126                              <1> 	; ESI = file (user data) offset
  7127                              <1> 	; EDI = sector (I/O) buffer offset
  7128                              <1> 	; ECX = byte count
  7129                              <1> 	;
  7130 0000EB05 F3A4                <1>   	rep	movsb
  7131                              <1> 	; 25/07/2015
  7132                              <1> 	; eax = remain bytes in buffer
  7133                              <1>         ;       (check if remain bytes in the buffer > [u.pcount])
  7134 0000EB07 09C0                <1> 	or	eax, eax
  7135 0000EB09 75EB                <1> 	jnz	short dskw_3 ; (page end before system buffer end!)	
  7136                              <1> 
  7137                              <1> 	; 23/10/2016
  7138 0000EB0B B101                <1> 	mov	cl, 1
  7139 0000EB0D 5E                  <1> 	pop	esi
  7140 0000EB0E A1[14650100]        <1> 	mov	eax, [writei.sector]
  7141                              <1> 	; esi = logical dos drive description table address
  7142                              <1> 	; eax = sector number
  7143                              <1> 	; ebx = writei buffer address
  7144                              <1> 	; ecx = sector count
  7145 0000EB13 E8350D0000          <1> 	call	disk_write ; / yes, write the block
  7146 0000EB18 7307                <1> 	jnc	short dskw_5
  7147                              <1> 
  7148 0000EB1A B812000000          <1> 	mov	eax, 18 ; drive not ready or WRITE ERROR !
  7149 0000EB1F EB99                <1> 	jmp	short dskw_err
  7150                              <1> 
  7151                              <1> dskw_5:
  7152                              <1> 	; 26/10/2016
  7153 0000EB21 0FB61D[34650100]    <1> 	movzx	ebx, byte [writei.ofn] ; open file number
  7154 0000EB28 C0E302              <1> 	shl	bl, 2 ; *4
  7155 0000EB2B 8B83[04690100]      <1> 	mov	eax, [ebx+OF_POINTER]
  7156 0000EB31 3B83[2C690100]      <1> 	cmp	eax, [ebx+OF_SIZE]
  7157 0000EB37 7606                <1> 	jna	short dskw_6
  7158 0000EB39 8983[2C690100]      <1> 	mov	[ebx+OF_SIZE], eax
  7159                              <1> dskw_6:
  7160                              <1> 	;shr	bl, 2
  7161 0000EB3F 833D[88030300]00    <1>         cmp     dword [u.count], 0 ; / any more data to write?
  7162 0000EB46 760A                <1> 	jna	short dskw_7
  7163 0000EB48 A1[24650100]        <1> 	mov	eax, [writei.fclust]
  7164 0000EB4D E931FFFFFF          <1> 	jmp	dskw_0 ; / yes, branch
  7165                              <1> dskw_7:
  7166                              <1>  	; update last modif. date&time of the file
  7167                              <1> 	; (also updates file size as OF_SIZE)
  7168 0000EB52 E82E030000          <1> 	call	update_file_lmdt
  7169                              <1> 	;mov	byte [setfmod], 0	
  7170                              <1> 
  7171                              <1> 	; 03/08/2013
  7172 0000EB57 C605[C6030300]00    <1> 	mov	byte [u.kcall], 0
  7173                              <1> 	; 23/10/2016
  7174                              <1> 	;mov	eax, [writei.fclust]
  7175 0000EB5E C3                  <1> 	retn
  7176                              <1> 
  7177                              <1> mget_w:
  7178                              <1> 	; 02/11/2016
  7179                              <1> 	; 01/11/2016
  7180                              <1> 	; 23/10/2016, 31/10/2016
  7181                              <1> 	; 22/10/2016 - TRDOS 386 (TRDOS v2.0)
  7182                              <1> 	; 03/06/2015 (Retro UNIX 386 v1, 'mget', u.5s)
  7183                              <1> 	; 22/03/2013 - 31/07/2013 (Retro UNIX 8086 v1)
  7184                              <1> 	;
  7185                              <1> 	; Get existing or (allocate) a new disk block for file
  7186                              <1> 	; 
  7187                              <1> 	; INPUTS ->
  7188                              <1> 	;    [u.fofp] = file offset pointer
  7189                              <1> 	;    [i.size] = file size
  7190                              <1> 	;    [u.count] = byte count	 
  7191                              <1> 	;    EAX = First cluster
  7192                              <1> 	;    [cdev] = Logical dos drive number 	  
  7193                              <1> 	;    [writei.ofn] = File Number
  7194                              <1> 	;		   (Open file index, 0 based)
  7195                              <1> 	;    ([u.off] = file offset)
  7196                              <1> 	; OUTPUTS ->
  7197                              <1> 	;    EAX = logical sector number
  7198                              <1> 	;    ESI = Logical Dos Drive Description Table address
  7199                              <1> 	;
  7200                              <1> 	; Modified registers: EDX, EBX, ECX, ESI, EDI, EBP  
  7201                              <1> 
  7202 0000EB5F 8B35[74030300]      <1>         mov     esi, [u.fofp]
  7203 0000EB65 8B2E                <1> 	mov	ebp, [esi] ; u.off (or EBX*4+OF_POINTER)
  7204                              <1> 
  7205 0000EB67 29C9                <1> 	sub	ecx, ecx
  7206 0000EB69 8A2D[46030300]      <1> 	mov	ch, [cdev]
  7207                              <1> 
  7208 0000EB6F BE00010900          <1> 	mov	esi, Logical_DOSDisks
  7209 0000EB74 01CE                <1> 	add	esi, ecx
  7210                              <1> 
  7211                              <1> 	; 31/10/2016
  7212 0000EB76 89C3                <1> 	mov	ebx, eax ; First Cluster or FDT address
  7213                              <1> 
  7214 0000EB78 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  7215 0000EB7C 0F86DD010000        <1> 	jna	mget_w_14 ; Singlix FS
  7216                              <1> 
  7217 0000EB82 0FB74611            <1> 	movzx	eax, word [esi+LD_BPB+BytesPerSec]
  7218 0000EB86 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+SecPerClust]
  7219 0000EB8A 8815[12650100]      <1> 	mov	[writei.spc], dl  ; sectors per cluster
  7220 0000EB90 F7E2                <1> 	mul	edx
  7221                              <1> 	; edx = 0
  7222                              <1> 	; eax = bytes per cluster (<= 65536)
  7223                              <1> 
  7224                              <1> 	; 02/11/2016
  7225 0000EB92 89C1                <1> 	mov	ecx, eax
  7226 0000EB94 48                  <1> 	dec	eax
  7227 0000EB95 66A3[18650100]      <1> 	mov	[writei.bpc], ax	
  7228                              <1> 	
  7229 0000EB9B 89E8                <1> 	mov	eax, ebp
  7230 0000EB9D 0305[88030300]      <1> 	add	eax, [u.count] ; next file position
  7231 0000EBA3 3B05[55040300]      <1> 	cmp	eax, [i.size] ; <= file size ?
  7232 0000EBA9 0F86FC000000        <1> 	jna	mget_w_4 ; no
  7233                              <1> 
  7234 0000EBAF F7F1                <1> 	div	ecx
  7235 0000EBB1 A3[20650100]        <1> 	mov	[writei.c_index], eax ; cluster index
  7236                              <1> 	; edx = byte offset in cluster (<= 65535)
  7237                              <1> 	;mov	[writei.offset], dx
  7238                              <1> 	;shr	dx, 9 ; / 512
  7239                              <1> 	;mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7240                              <1> 
  7241 0000EBB6 29D2                <1> 	sub	edx, edx ; 01/11/2016
  7242 0000EBB8 8915[14650100]      <1> 	mov 	[writei.sector], edx ; 0
  7243 0000EBBE 668915[1A650100]    <1> 	mov	[writei.offset], dx  ; byte offset in cluster 
  7244 0000EBC5 8815[13650100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7245                              <1> 
  7246 0000EBCB 89D8                <1> 	mov	eax, ebx ; First Cluster
  7247                              <1> 
  7248                              <1> 	; is this the 1st mget_w or a next mget_w call ? (by 'writei')
  7249 0000EBCD 3815[10650100]      <1> 	cmp	byte [writei.valid], dl ; 0 
  7250 0000EBD3 7624                <1> 	jna	short mget_w_0
  7251                              <1> 
  7252 0000EBD5 8815[10650100]      <1> 	mov 	byte [writei.valid], dl ; 0 ; reset ('writei' will set it) 
  7253                              <1> 
  7254 0000EBDB 3B05[24650100]      <1> 	cmp	eax, [writei.fclust]
  7255 0000EBE1 7516                <1> 	jne	short mget_w_0
  7256                              <1> 
  7257 0000EBE3 8A0D[46030300]      <1> 	mov	cl, [cdev]
  7258 0000EBE9 3A0D[11650100]      <1> 	cmp	cl, [writei.drv]
  7259 0000EBEF 7508                <1> 	jne	short mget_w_0
  7260                              <1>  	; [writei.l_clust] & [writei.l_index] are valid, 
  7261                              <1> 	;  we don't need to get last cluster & last cluster index
  7262 0000EBF1 8B0D[30650100]      <1> 	mov	ecx, [writei.l_index]
  7263 0000EBF7 EB64                <1> 	jmp	short mget_w_2
  7264                              <1> mget_w_0:
  7265 0000EBF9 A3[24650100]        <1> 	mov	[writei.fclust], eax ; first cluster
  7266                              <1> 	; edx = 0
  7267 0000EBFE A3[1C650100]        <1> 	mov	[writei.cluster], eax ; first cluster ; 01/11/2016
  7268 0000EC03 8915[28650100]      <1> 	mov 	[writei.fs_index], edx ; 0 ; curret cluster index
  7269                              <1> 
  7270                              <1> 	; FAT file system (FAT12, FAT16, FAT32)
  7271 0000EC09 E8B9D7FFFF          <1> 	call	get_last_cluster
  7272 0000EC0E 0F822B010000        <1> 	jc	mget_w_err ; eax = error code
  7273                              <1> 		
  7274 0000EC14 A3[2C650100]        <1> 	mov	[writei.lclust], eax ; last cluster
  7275                              <1> 
  7276 0000EC19 8B0D[50630100]      <1> 	mov	ecx, [glc_index] ; last cluster index
  7277 0000EC1F 890D[30650100]      <1> 	mov	[writei.l_index], ecx
  7278                              <1> 
  7279 0000EC25 A0[34650100]        <1> 	mov	al, [writei.ofn]
  7280 0000EC2A FEC0                <1> 	inc	al
  7281 0000EC2C A2[6F650100]        <1> 	mov	[setfmod], al ; update lm date&time sign
  7282                              <1> 
  7283                              <1> mget_w_1:
  7284 0000EC31 3B0D[20650100]      <1> 	cmp	ecx, [writei.c_index]  ; last cluster index
  7285 0000EC37 7324                <1> 	jnb	short mget_w_2 ; 01/11/2016
  7286                              <1> 
  7287 0000EC39 A1[2C650100]        <1> 	mov	eax, [writei.lclust]
  7288                              <1> 	; EAX = Last cluster
  7289 0000EC3E E892D8FFFF          <1> 	call	add_new_cluster
  7290 0000EC43 0F82F6000000        <1> 	jc	mget_w_err ; eax = error code
  7291                              <1> 	; edx = 0
  7292 0000EC49 A3[2C650100]        <1> 	mov	[writei.lclust], eax ; (new) last cluster
  7293 0000EC4E 8B0D[30650100]      <1> 	mov	ecx, [writei.l_index]
  7294 0000EC54 41                  <1> 	inc	ecx ; add 1 to last cluster index
  7295 0000EC55 890D[30650100]      <1> 	mov	[writei.l_index], ecx ; current last cluster index
  7296                              <1> 
  7297 0000EC5B EBD4                <1> 	jmp	short mget_w_1
  7298                              <1> 
  7299                              <1> mget_w_2:
  7300 0000EC5D 89E9                <1> 	mov	ecx, ebp
  7301 0000EC5F 030D[88030300]      <1> 	add	ecx, [u.count]
  7302 0000EC65 890D[55040300]      <1> 	mov	[i.size], ecx ; save new file size
  7303                              <1> 	;sub	edx, edx ; 0
  7304                              <1> 
  7305 0000EC6B A0[46030300]        <1> 	mov	al, [cdev]
  7306 0000EC70 A2[11650100]        <1> 	mov	[writei.drv], al ; physical drive number
  7307                              <1> 	; edx = 0
  7308 0000EC75 89E8                <1> 	mov	eax, ebp ; file offset
  7309 0000EC77 0FB70D[18650100]    <1> 	movzx	ecx, word [writei.bpc] ; bytes per cluster - 1
  7310 0000EC7E 41                  <1> 	inc	ecx ; bytes per cluster
  7311 0000EC7F F7F1                <1> 	div	ecx
  7312                              <1> 	; edx = byte offset in cluster (<= 65535)
  7313                              <1> 	; eax = cluster index
  7314 0000EC81 A3[20650100]        <1> 	mov	[writei.c_index], eax
  7315 0000EC86 668915[1A650100]    <1> 	mov	[writei.offset], dx
  7316 0000EC8D 66C1EA09            <1> 	shr	dx, 9 ; / 512
  7317 0000EC91 8815[13650100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7318                              <1> 
  7319                              <1> mget_w_3:
  7320 0000EC97 3B05[30650100]      <1> 	cmp	eax, [writei.l_index] ; last cluster index
  7321 0000EC9D 752A                <1> 	jne	short mget_w_5
  7322                              <1> 
  7323 0000EC9F A3[28650100]        <1> 	mov	[writei.fs_index], eax ; cluster index (for next check)
  7324 0000ECA4 A1[2C650100]        <1> 	mov	eax, [writei.lclust] ; last cluster
  7325 0000ECA9 EB60                <1> 	jmp	short mget_w_10
  7326                              <1> 
  7327                              <1> mget_w_4: ; 02/11/2016
  7328                              <1> 	; eax = next file position
  7329 0000ECAB 2B05[88030300]      <1> 	sub	eax, [u.count] ; current file position
  7330                              <1> 	; edx = 0
  7331                              <1> 	; ecx = bytes per cluster
  7332 0000ECB1 F7F1                <1> 	div	ecx
  7333 0000ECB3 A3[20650100]        <1> 	mov	[writei.c_index], eax ; cluster index
  7334 0000ECB8 668915[1A650100]    <1> 	mov	[writei.offset], dx
  7335 0000ECBF 66C1EA09            <1> 	shr	dx, 9 ; / 512
  7336 0000ECC3 8815[13650100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7337                              <1> 
  7338                              <1> mget_w_5:
  7339 0000ECC9 21C0                <1> 	and	eax, eax ; 0 = First Cluster's index number
  7340 0000ECCB 750C                <1> 	jnz	short mget_w_6
  7341                              <1> 
  7342 0000ECCD A3[28650100]        <1> 	mov	[writei.fs_index], eax ; cluster index (for next check)
  7343 0000ECD2 A1[24650100]        <1> 	mov	eax, [writei.fclust] ; first cluster
  7344 0000ECD7 EB32                <1> 	jmp	short mget_w_10
  7345                              <1> 
  7346                              <1> mget_w_6:
  7347 0000ECD9 3B05[28650100]      <1> 	cmp	eax, [writei.fs_index] ; current cluster index (>0)
  7348 0000ECDF 7507                <1> 	jne	short mget_w_7
  7349 0000ECE1 A1[1C650100]        <1> 	mov	eax, [writei.cluster] ; current cluster 
  7350 0000ECE6 EB3A                <1> 	jmp	short mget_w_11
  7351                              <1> 
  7352                              <1> mget_w_7:
  7353 0000ECE8 89C1                <1> 	mov	ecx, eax
  7354 0000ECEA 2B0D[28650100]      <1> 	sub	ecx, [writei.fs_index]
  7355 0000ECF0 730D                <1> 	jnc	short mget_w_8
  7356                              <1> 	; get cluster by index from the first cluster
  7357 0000ECF2 A1[24650100]        <1> 	mov	eax, [writei.fclust]
  7358 0000ECF7 8B0D[20650100]      <1> 	mov	ecx, [writei.c_index]
  7359 0000ECFD EB05                <1> 	jmp	short mget_w_9
  7360                              <1> 
  7361                              <1> mget_w_8:
  7362 0000ECFF A1[1C650100]        <1> 	mov	eax, [writei.cluster] ; beginning cluster
  7363                              <1> 	; ecx = cluster sequence number after the beginning cluster
  7364                              <1> 	; sub	edx, edx ; 0
  7365                              <1> 
  7366                              <1> mget_w_9:
  7367                              <1> 	; EAX = Beginning cluster
  7368                              <1> 	; EDX = Sector index in disk/file section
  7369                              <1> 	;	(Only for SINGLIX file system!)
  7370                              <1> 	; ECX = Cluster sequence number after the beginning cluster
  7371                              <1> 	; ESI = Logical DOS Drive Description Table address
  7372 0000ED04 E8D2D8FFFF          <1> 	call	get_cluster_by_index
  7373 0000ED09 7234                <1> 	jc	short mget_w_err ; error code in EAX
  7374                              <1> 	; EAX = Cluster number		
  7375                              <1> mget_w_10:
  7376 0000ED0B A3[1C650100]        <1> 	mov	[writei.cluster], eax ; FDT number for Singlix File System
  7377                              <1> 
  7378 0000ED10 807E0300            <1> 	cmp	byte [esi+LD_FATType], 0
  7379 0000ED14 7638                <1> 	jna	short mget_w_13
  7380                              <1> 	; 01/11/2016
  7381 0000ED16 8B15[20650100]      <1> 	mov	edx, [writei.c_index]
  7382 0000ED1C 8915[28650100]      <1> 	mov	[writei.fs_index], edx
  7383                              <1> mget_w_11:
  7384 0000ED22 83E802              <1> 	sub	eax, 2
  7385 0000ED25 0FB615[12650100]    <1> 	movzx	edx, byte [writei.spc]
  7386 0000ED2C F7E2                <1> 	mul	edx
  7387                              <1> 
  7388 0000ED2E 034668              <1> 	add	eax, [esi+LD_DATABegin]
  7389 0000ED31 8A15[13650100]      <1> 	mov	dl, [writei.s_index]
  7390 0000ED37 01D0                <1> 	add	eax, edx
  7391                              <1> mget_w_12:
  7392 0000ED39 A3[14650100]        <1> 	mov	[writei.sector], eax
  7393                              <1> 	;; buffer validation must be done in writei
  7394                              <1> 	;;mov	byte [writei.valid], 1 
  7395 0000ED3E C3                  <1> 	retn
  7396                              <1> 
  7397                              <1> mget_w_err:
  7398 0000ED3F A3[C8030300]        <1> 	mov	[u.error], eax
  7399 0000ED44 A3[64030300]        <1> 	mov	[u.r0], eax
  7400 0000ED49 E9F4D9FFFF          <1> 	jmp	error
  7401                              <1> 
  7402                              <1> mget_w_13:
  7403                              <1> 	; EAX = FDT number (Current Section)
  7404                              <1> 	; EDX = Sector index from the first section (0,1,2,3,4...)
  7405 0000ED4E 2B15[28650100]      <1> 	sub	edx, [writei.fs_index]	
  7406                              <1> 	; EDX = Sector index from current section
  7407 0000ED54 8915[28650100]      <1> 	mov	[writei.fs_index], edx
  7408 0000ED5A 40                  <1> 	inc	eax ; the first data sector in FS disk section	
  7409 0000ED5B 01D0                <1> 	add	eax, edx
  7410 0000ED5D EBDA                <1> 	jmp	short mget_w_12
  7411                              <1> 
  7412                              <1> mget_w_14:
  7413 0000ED5F 8A4E12              <1> 	mov	cl, [esi+LD_FS_BytesPerSec+1]
  7414 0000ED62 D0E9                <1> 	shr	cl, 1 ;  ; 1 for 512 bytes, 4 for 2048 bytes
  7415 0000ED64 880D[12650100]      <1> 	mov	[writei.spc], cl  ; sectors per cluster
  7416                              <1> 	; NOTE: writei bytes per sector value is always 512 ! 
  7417 0000ED6A 66C705[18650100]00- <1> 	mov	word [writei.bpc], 512
  7417 0000ED72 02                  <1>
  7418                              <1> 
  7419 0000ED73 89E9                <1> 	mov	ecx, ebp
  7420 0000ED75 030D[88030300]      <1> 	add	ecx, [u.count] ; next file position
  7421 0000ED7B 3B0D[55040300]      <1> 	cmp	ecx, [i.size] ; <= file size ?
  7422 0000ED81 0F86C8000000        <1> 	jna	mget_w_19 ; no
  7423                              <1> 
  7424 0000ED87 29D2                <1> 	sub	edx, edx ; 0
  7425 0000ED89 8915[14650100]      <1> 	mov 	[writei.sector], edx ; 0
  7426 0000ED8F 668915[1A650100]    <1> 	mov	[writei.offset], dx  ; byte offset in cluster 
  7427 0000ED96 8815[13650100]      <1> 	mov	[writei.s_index], dl ; sector index in cluster (0 to spc -1)
  7428                              <1> 
  7429 0000ED9C C1E909              <1> 	shr	ecx, 9 ; 1 cluster = 512 bytes
  7430 0000ED9F 890D[20650100]      <1> 	mov	[writei.c_index], ecx ; section/cluster index
  7431                              <1> 	
  7432 0000EDA5 89D8                <1> 	mov	eax, ebx ; FDT number (First FDT address)
  7433                              <1> 
  7434                              <1> 	; is this the 1st mget_w or a next mget_w call ? (by 'writei')
  7435 0000EDA7 3815[10650100]      <1> 	cmp	byte [writei.valid], dl ; 0 
  7436 0000EDAD 7624                <1> 	jna	short mget_w_15
  7437                              <1> 
  7438 0000EDAF 8815[10650100]      <1> 	mov 	byte [writei.valid], dl ; 0 ; reset ('writei' will set it) 
  7439                              <1> 
  7440 0000EDB5 3B05[24650100]      <1> 	cmp	eax, [writei.fclust]
  7441 0000EDBB 7516                <1> 	jne	short mget_w_15
  7442                              <1> 
  7443 0000EDBD 8A0D[46030300]      <1> 	mov	cl, [cdev]
  7444 0000EDC3 3A0D[11650100]      <1> 	cmp	cl, [writei.drv]
  7445 0000EDC9 7508                <1> 	jne	short mget_w_15
  7446                              <1>  	; [writei.l_clust] & [writei.l_index] are valid, 
  7447                              <1> 	;  we don't need to get last cluster & last cluster index
  7448 0000EDCB 8B0D[30650100]      <1> 	mov	ecx, [writei.l_index]
  7449 0000EDD1 EB49                <1> 	jmp	short mget_w_17
  7450                              <1> mget_w_15:
  7451 0000EDD3 A3[24650100]        <1> 	mov	[writei.fclust], eax ; first section (FDT number)
  7452                              <1> 	; edx = 0
  7453 0000EDD8 8915[1C650100]      <1> 	mov	[writei.cluster], edx ; 0 ; current section
  7454 0000EDDE 8915[28650100]      <1> 	mov 	[writei.fs_index], edx ; 0 ; curret section index
  7455                              <1> 
  7456                              <1> 	; eax = FDT number (section 0 header address)
  7457 0000EDE4 E81CD8FFFF          <1> 	call	get_last_section
  7458 0000EDE9 0F8250FFFFFF        <1> 	jc	mget_w_err ; eax = error code
  7459                              <1> 
  7460 0000EDEF 8915[28650100]      <1> 	mov 	[writei.fs_index], edx ; sector index in last section
  7461                              <1> 		
  7462 0000EDF5 A3[2C650100]        <1> 	mov	[writei.lclust], eax ; last section address
  7463                              <1> 
  7464 0000EDFA 8B0D[50630100]      <1> 	mov	ecx, [glc_index] ; last section index
  7465 0000EE00 890D[30650100]      <1> 	mov	[writei.l_index], ecx
  7466                              <1> 
  7467 0000EE06 A0[34650100]        <1> 	mov	al, [writei.ofn]
  7468 0000EE0B FEC0                <1> 	inc	al
  7469 0000EE0D A2[6F650100]        <1> 	mov	[setfmod], al ; update lm date&time sign
  7470                              <1> 
  7471                              <1> mget_w_16:
  7472                              <1> 	; edx = (existing) last section (sector) index
  7473 0000EE12 8B0D[20650100]      <1> 	mov	ecx, [writei.c_index] ; final section (sector) index
  7474 0000EE18 29D1                <1> 	sub	ecx, edx
  7475 0000EE1A 7633                <1> 	jna	short mget_w_19
  7476                              <1> 	 ; ecx = sector count
  7477                              <1> mget_w_17:
  7478 0000EE1C A1[2C650100]        <1> 	mov	eax, [writei.lclust]
  7479                              <1> 	; ESI = Logical dos drv desc. table address
  7480                              <1>         ; EAX = Last section
  7481                              <1>         ; (ECX = 0 for directory) 
  7482                              <1>         ; ECX = sector count (except FDT)
  7483 0000EE21 E8A2CDFFFF          <1> 	call	add_new_fs_section
  7484 0000EE26 7312                <1> 	jnc	short mget_w_18
  7485                              <1> 
  7486                              <1> 	; If error number = 27h (insufficient disk space)
  7487                              <1> 	; it is needed to check free consequent sectors
  7488                              <1> 	; (1 data sector at least and +1 section header sector) 
  7489                              <1> 
  7490 0000EE28 83F827              <1> 	cmp	eax, 27h
  7491 0000EE2B 0F850EFFFFFF        <1> 	jne	mget_w_err ; eax = error code
  7492                              <1> 
  7493                              <1> 	; ecx = count of free consequent sectors
  7494                              <1> 	; ecx must be > 1 (1 data + 1 header sector)
  7495 0000EE31 49                  <1> 	dec	ecx
  7496 0000EE32 0F8407FFFFFF        <1> 	jz	mget_w_err
  7497 0000EE38 EBE2                <1> 	jmp	short mget_w_17
  7498                              <1> 
  7499                              <1> mget_w_18:
  7500 0000EE3A A3[2C650100]        <1> 	mov	[writei.lclust], eax ; (new) last section
  7501                              <1> 	; ecx = sector count (except section header)
  7502 0000EE3F 8B15[30650100]      <1> 	mov	edx, [writei.l_index]
  7503 0000EE45 01CA                <1> 	add	edx, ecx ; add sector count to index
  7504 0000EE47 8915[30650100]      <1> 	mov	[writei.l_index], edx
  7505 0000EE4D EBC3                <1> 	jmp	short mget_w_16
  7506                              <1> 
  7507                              <1> mget_w_19:
  7508 0000EE4F 89E9                <1> 	mov	ecx, ebp
  7509 0000EE51 030D[88030300]      <1> 	add	ecx, [u.count]
  7510 0000EE57 890D[55040300]      <1> 	mov	[i.size], ecx ; save new file size
  7511                              <1> 	;sub	edx, edx ; 0
  7512                              <1> 
  7513 0000EE5D A0[46030300]        <1> 	mov	al, [cdev]
  7514 0000EE62 A2[11650100]        <1> 	mov	[writei.drv], al ; physical drive number
  7515                              <1> 	; edx = 0
  7516 0000EE67 89E8                <1> 	mov	eax, ebp ; file offset
  7517 0000EE69 89C2                <1> 	mov	edx, eax
  7518                              <1> 	; 1 cluster = 512 bytes (for Singlix FS)
  7519 0000EE6B C1E809              <1> 	shr	eax, 9  ; / 512
  7520 0000EE6E 81E2FF010000        <1> 	and	edx, 1FFh
  7521                              <1> 	; edx = byte offset in cluster/sector (<= 511)
  7522                              <1> 	; eax = section (sector/cluster) index
  7523 0000EE74 A3[20650100]        <1> 	mov	[writei.c_index], eax
  7524 0000EE79 668915[1A650100]    <1> 	mov	[writei.offset], dx
  7525                              <1> 	;mov	byte [writei.s_index], 0 ; sector index in cluster
  7526 0000EE80 E912FEFFFF          <1> 	jmp	mget_w_3
  7527                              <1> 
  7528                              <1> update_file_lmdt: ; & update file size
  7529                              <1> 	; 26/10/2016
  7530                              <1> 	; 24/10/2016
  7531                              <1> 	; 23/10/2016
  7532                              <1> 	; 22/10/2016 - TRDOS 386 (TRDOS v2.0)
  7533                              <1> 	;
  7534                              <1> 	; Update last modification date&time of file
  7535                              <1> 	; (call from syswrite -> writei)
  7536                              <1> 	; ((also updates file size)) // 26/10/2016
  7537                              <1> 	; 
  7538                              <1> 	; INPUT:
  7539                              <1> 	;      byte [setfmod] = open file number
  7540                              <1> 	; OUTPUT:
  7541                              <1> 	;      cf = 0 -> success !
  7542                              <1> 	;      cf = 1 -> lmdt update has been failed! 	 
  7543                              <1> 	;
  7544                              <1> 	; Modified registers: eax, ebx, ecx, edx, esi, edi       				
  7545                              <1> 	;
  7546                              <1> 
  7547                              <1> 	;cmp	byte [setfmod], 0
  7548                              <1> 	;jna	short uflmdt_2 ; nothing to do
  7549                              <1> 
  7550 0000EE85 31C0                <1> 	xor	eax, eax
  7551                              <1> 
  7552 0000EE87 0FB61D[6F650100]    <1> 	movzx	ebx, byte [setfmod]
  7553 0000EE8E FECB                <1> 	dec	bl ; open file index number (0 based)
  7554                              <1> 
  7555 0000EE90 8AA3[DC680100]      <1> 	mov	ah, [ebx+OF_DRIVE]
  7556 0000EE96 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  7557 0000EE9B 01C6                <1> 	add	esi, eax
  7558 0000EE9D C0E302              <1> 	shl	bl, 2 ; *4	
  7559 0000EEA0 8B8B[B4680100]      <1> 	mov	ecx, [ebx+OF_FCLUSTER] ; first cluster
  7560 0000EEA6 8B93[7C690100]      <1> 	mov	edx, [ebx+OF_DIRCLUSTER] ; dir cluster
  7561                              <1> 
  7562 0000EEAC D0EB                <1> 	shr	bl, 1 ; /2
  7563 0000EEAE 0FB7BB[1C6A0100]    <1> 	movzx	edi, word [ebx+OF_DIRENTRY]
  7564                              <1> 	
  7565 0000EEB5 803D[AC600100]01    <1> 	cmp	byte [DirBuff_ValidData], 1
  7566 0000EEBC 726E                <1> 	jb	short uflmdt_4
  7567                              <1> 
  7568 0000EEBE A0[AA600100]        <1> 	mov	al, [DirBuff_DRV]
  7569 0000EEC3 2C41                <1> 	sub	al, 'A'	
  7570 0000EEC5 38E0                <1> 	cmp	al, ah
  7571 0000EEC7 7563                <1> 	jne	short uflmdt_4 ; different drive
  7572 0000EEC9 8A4603              <1> 	mov	al, [esi+LD_FATType] 
  7573 0000EECC 3A05[AB600100]      <1> 	cmp	al, [DirBuff_FATType]
  7574 0000EED2 755B                <1> 	jne	short uflmdt_5 ; different FS type
  7575 0000EED4 3B15[B1600100]      <1> 	cmp	edx, [DirBuff_Cluster]
  7576 0000EEDA 7553                <1> 	jne	short uflmdt_5 ; different cluster
  7577                              <1> 
  7578                              <1> uflmdt_1:
  7579                              <1> 	; Directory buffer is ready here!
  7580                              <1> 	; OF_FCLUSTER must be compared/verified
  7581 0000EEDC BE00000800          <1> 	mov	esi, Directory_Buffer
  7582 0000EEE1 66C1E705            <1> 	shl	di, 5 ; dir entry index * 32
  7583 0000EEE5 01FE                <1> 	add	esi, edi ; offset
  7584                              <1> 	;
  7585 0000EEE7 F6460B18            <1> 	test	byte [esi+DirEntry_Attr], 18h ; Vol & Dir
  7586 0000EEEB 750F                <1> 	jnz	short uflmdt_2 ; not a valid file !
  7587 0000EEED 668B4614            <1> 	mov	ax, [esi+DirEntry_FstClusHI]
  7588 0000EEF1 C1E010              <1> 	shl	eax, 16
  7589 0000EEF4 668B461A            <1> 	mov	ax, [esi+DirEntry_FstClusLO]
  7590 0000EEF8 39C8                <1> 	cmp	eax, ecx ; same first cluster ?
  7591 0000EEFA 7407                <1> 	je	short uflmdt_3 ; yes, it is OK !!!	
  7592                              <1> 
  7593                              <1> uflmdt_2:	
  7594                              <1> 	; save directory buffer if has modified/changed sign
  7595                              <1> 	; (It is good to save dir buff even if the searched
  7596                              <1> 	; directory entry is not found !?)
  7597 0000EEFC E81BBAFFFF          <1> 	call	save_directory_buffer
  7598 0000EF01 F9                  <1> 	stc	; update failed
  7599 0000EF02 C3                  <1> 	retn
  7600                              <1> 	
  7601                              <1> uflmdt_3:
  7602                              <1> 	; Update directory entry
  7603                              <1> 	; 26/10/2016
  7604 0000EF03 D0E3                <1> 	shl	bl, 1 ; *2 
  7605 0000EF05 8B83[2C690100]      <1> 	mov	eax, [ebx+OF_SIZE] ; file size
  7606 0000EF0B 89461C              <1> 	mov	[esi+DirEntry_FileSize], eax
  7607                              <1> 	;
  7608 0000EF0E E86BB9FFFF          <1> 	call	convert_current_date_time
  7609                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  7610                              <1>         ; 	    AX = Time in dos dir entry format	
  7611 0000EF13 66894616            <1> 	mov	[esi+DirEntry_WrtTime], ax
  7612 0000EF17 66895618            <1> 	mov	[esi+DirEntry_WrtDate], dx	
  7613 0000EF1B 66895612            <1> 	mov	[esi+DirEntry_LastAccDate], dx
  7614 0000EF1F C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2
  7615 0000EF26 E8F1B9FFFF          <1> 	call	save_directory_buffer
  7616 0000EF2B C3                  <1> 	retn
  7617                              <1> 
  7618                              <1> uflmdt_4:
  7619                              <1> 	; Directory buffer sector read&write
  7620                              <1> 	; 23/10/2016
  7621                              <1> 	;
  7622 0000EF2C 8A4603              <1> 	mov	al, [esi+LD_FATType]
  7623                              <1> uflmdt_5:
  7624 0000EF2F BB[9C090300]        <1> 	mov	ebx, rw_buffer ; Common r/w sector buffer addr
  7625                              <1> 		
  7626 0000EF34 20C0                <1> 	and	al, al ; 0 = Singlix FS
  7627 0000EF36 0F8492000000        <1> 	jz	uflmdt_11
  7628                              <1> 
  7629 0000EF3C 21D2                <1> 	and	edx, edx
  7630 0000EF3E 7521                <1> 	jnz	short uflmdt_9
  7631                              <1> 
  7632 0000EF40 3C02                <1> 	cmp	al, 2  ; 3 = FAT32
  7633 0000EF42 771A                <1> 	ja	short uflmdt_8
  7634                              <1> 
  7635 0000EF44 89F8                <1> 	mov	eax, edi ; directory entry index number
  7636 0000EF46 66C1E804            <1> 	shr	ax, 4 ; 16 entries per sector	 
  7637 0000EF4A 034664              <1> 	add	eax, [esi+LD_ROOTBegin]
  7638                              <1> 	; eax = root directory sector
  7639                              <1> uflmdt_6:
  7640 0000EF4D 50                  <1> 	push	eax ; * ; disk sector address
  7641 0000EF4E 51                  <1> 	push	ecx ; first cluster	
  7642 0000EF4F B901000000          <1> 	mov	ecx, 1
  7643                              <1> 	; ecx = sector count
  7644 0000EF54 E803090000          <1> 	call	disk_read
  7645 0000EF59 59                  <1> 	pop	ecx
  7646 0000EF5A 731A                <1> 	jnc	short uflmdt_10
  7647 0000EF5C 58                  <1> 	pop	eax ; *
  7648                              <1> uflmdt_7:
  7649 0000EF5D C3                  <1> 	retn	
  7650                              <1> 
  7651                              <1> uflmdt_8:
  7652 0000EF5E 8B5632              <1> 	mov	edx, [esi+LD_BPB+FAT32_RootFClust]
  7653                              <1> uflmdt_9:
  7654 0000EF61 83FA02              <1> 	cmp	edx, 2
  7655 0000EF64 72F7                <1> 	jb	short uflmdt_7 ; invalid, nothing to do
  7656                              <1> 
  7657 0000EF66 83EA02              <1> 	sub	edx, 2
  7658 0000EF69 89D0                <1> 	mov	eax, edx
  7659 0000EF6B 0FB65613            <1> 	movzx	edx, byte [esi+LD_BPB+SecPerClust]
  7660 0000EF6F F7E2                <1> 	mul	edx
  7661 0000EF71 034668              <1> 	add	eax, [esi+LD_DATABegin]
  7662                              <1> 	; eax = sub directory (data) sector 
  7663 0000EF74 EBD7                <1> 	jmp	short uflmdt_6
  7664                              <1> 
  7665                              <1> uflmdt_10:
  7666                              <1> 	; Directory sector buffer is ready here!
  7667                              <1> 	; OF_FCLUSTER must be compared/verified
  7668                              <1> 	; edi = dir entry index number (<= 2047)
  7669 0000EF76 6683E70F            <1> 	and	di, 0Fh ; 16 entries per sector
  7670 0000EF7A 66C1E705            <1> 	shl	di, 5 ; dir entry index * 32
  7671 0000EF7E 81C7[9C090300]      <1> 	add	edi, rw_buffer
  7672                              <1> 	;
  7673 0000EF84 F6470B18            <1> 	test	byte [edi+DirEntry_Attr], 18h ; Vol & Dir
  7674 0000EF88 0F856EFFFFFF        <1> 	jnz	uflmdt_2 ; not a valid file !
  7675 0000EF8E 668B5714            <1> 	mov	dx, [edi+DirEntry_FstClusHI]
  7676 0000EF92 C1E210              <1> 	shl	edx, 16
  7677 0000EF95 668B571A            <1> 	mov	dx, [edi+DirEntry_FstClusLO]
  7678 0000EF99 39CA                <1> 	cmp	edx, ecx ; same first cluster ?
  7679 0000EF9B 0F855BFFFFFF        <1> 	jne	uflmdt_2 ; no !?
  7680                              <1> 
  7681                              <1> 	; Update directory entry
  7682 0000EFA1 E8D8B8FFFF          <1> 	call	convert_current_date_time
  7683                              <1> 	; OUTPUT -> DX = Date in dos dir entry format
  7684                              <1>         ; 	    AX = Time in dos dir entry format	
  7685 0000EFA6 66894716            <1> 	mov	[edi+DirEntry_WrtTime], ax
  7686 0000EFAA 66895718            <1> 	mov	[edi+DirEntry_WrtDate], dx	
  7687 0000EFAE 66895712            <1> 	mov	[edi+DirEntry_LastAccDate], dx
  7688                              <1> 	
  7689 0000EFB2 58                  <1> 	pop	eax ; *
  7690                              <1> 
  7691 0000EFB3 BB[9C090300]        <1> 	mov	ebx, rw_buffer ; Common r/w sector buffer addr
  7692 0000EFB8 B901000000          <1> 	mov	ecx, 1
  7693                              <1> 	; esi = logical dos description table address
  7694                              <1> 	; eax = disk sector number/address (LBA)
  7695                              <1> 	; ecx = sector count
  7696                              <1> 	; ebx = buffer address
  7697 0000EFBD E88B080000          <1> 	call	disk_write
  7698 0000EFC2 0F8234FFFFFF        <1> 	jc	uflmdt_2
  7699                              <1> 	
  7700                              <1> 	; save directory buffer if has modified/changed sign
  7701 0000EFC8 E84FB9FFFF          <1> 	call	save_directory_buffer
  7702 0000EFCD C3                  <1> 	retn
  7703                              <1> 
  7704                              <1> uflmdt_11:
  7705                              <1> 	; 24/10/2016
  7706                              <1> 	; Update last modification date & time of a file
  7707                              <1> 	; on a disk with Singlix File System.
  7708                              <1> 	;
  7709                              <1> 	; (Method: Read the FDT -File Description Table-
  7710                              <1> 	; sector of the file and update the lmdt data fields,
  7711                              <1> 	; then write FDT sector to the disk.
  7712                              <1> 	; /// It is easy but there is compatibility buffer
  7713                              <1> 	; method also for changing directory entry data and
  7714                              <1> 	; also there are some programming issues for Singlix
  7715                              <1> 	; file system (TRFS), which are not completed yet!)
  7716                              <1> 	;
  7717                              <1> 	; Not ready yet ! (24/10/2016)
  7718                              <1> 	; /// Temporary code for error return ! ///
  7719 0000EFCE 31C0                <1> 	xor	eax, eax
  7720 0000EFD0 F9                  <1> 	stc
  7721 0000EFD1 C3                  <1> 	retn
  7722                              <1> 
  7723                              <1> sysalloc:
  7724                              <1> 	; 14/10/2017
  7725                              <1> 	; 20/08/2017, 01/09/2017
  7726                              <1> 	; 20/02/2017, 04/03/2017, 15/05/2017
  7727                              <1> 	; 19/02/2017 - TRDOS 386 (TRDOS v2.0)
  7728                              <1> 	; (TRDOS 386 feature only!)
  7729                              <1> 	;
  7730                              <1> 	; Allocate Contiguous Memory Block/Pages (for user)
  7731                              <1> 	; (System call for DMA Buffer allocation etc.)	
  7732                              <1> 	;
  7733                              <1> 	; INPUT ->
  7734                              <1> 	;	EBX = Virtual address (for user)
  7735                              <1> 	;	     (Physical memory block/aperture
  7736                              <1> 	;	     will be mapped to this virtual address) 
  7737                              <1> 	;	ECX = Byte Count
  7738                              <1> 	;	     (will be rounded up to page border)
  7739                              <1> 	;	If ECX = 0
  7740                              <1> 	;	    System call will return with an error (cf=1)
  7741                              <1> 	;	    but ECX will contain maximum size of
  7742                              <1> 	;	    available memory aperture and physical
  7743                              <1> 	;	    (beginning) address of that aperture
  7744                              <1> 	;	    (which have maximum size) will be in EAX.
  7745                              <1> 	;	EDX = Upper limit of the requested physical memory
  7746                              <1> 	;	      block/pages.
  7747                              <1> 	;	     (The last byte address of the memory aperture 
  7748                              <1> 	;	      must not be equal to or above this limit.)	
  7749                              <1> 	;	If EDX = 0
  7750                              <1> 	; 	   there is NOLIMIT !
  7751                              <1> 	;	If EDX = 0FFFFFFFFh (-1) 
  7752                              <1> 	;	   ESI = Lower Limit !
  7753                              <1> 	;		(Beginning of the block must not be 'less'
  7754                              <1> 	;		than this.) (Must be equal to or above...)
  7755                              <1> 	;	   EDI = Upper Limit !
  7756                              <1> 	;		(End of the block must be !less! than this)
  7757                              <1> 	;		(The last byte addr of the memory aperture 
  7758                              <1> 	;		must not be equal to or above this limit.)
  7759                              <1> 	;
  7760                              <1> 	; OUTPUT ->
  7761                              <1> 	;	If CF = 0
  7762                              <1> 	;	EAX = Physical address of the allocated memory block
  7763                              <1> 	;	ECX = Allocated bytes (as rounded up to page borders)
  7764                              <1> 	;	EBX = Virtual address (as rounded up)
  7765                              <1> 	;	IF CF = 1
  7766                              <1> 	;	    Requested (size of) Memory block could not be 
  7767                              <1> 	;	    allocated to the user!	
  7768                              <1> 	;	IF CF = 1 & EAX = 0 (Insufficient memory error!)
  7769                              <1> 	;	   ECX = Total number of free bytes
  7770                              <1> 	;	         (not size of available contiguous bytes!)		 	
  7771                              <1> 	;	If CF = 1 & EAX > 0
  7772                              <1> 	;	   there is not a memory aperture with requested size
  7773                              <1> 	;	   but total free mem is not less than requested size.
  7774                              <1> 	;	   EAX = Physical addr of available memory aperture
  7775                              <1> 	;	   	 with max size 
  7776                              <1> 	;	        (but it doesn't fit to the conditions!) 	
  7777                              <1> 	;	   ECX = Size of available memory aperture in bytes.
  7778                              <1> 	;	If CF = 1 -> EAX = 0FFFFFFFFh	
  7779                              <1> 	;	   Conditions/Parameters are wrong !		 		
  7780                              <1> 	;	   ECX is same with input value.
  7781                              <1> 	;
  7782                              <1> 	; Note:	Previously allocated pages will be deallocated if
  7783                              <1> 	;       new allocation conditions are met.
  7784                              <1> 	;
  7785                              <1> 	; Note: u.break control may be included in future versions	
  7786                              <1> 	;
  7787                              <1> 
  7788 0000EFD2 31C0                <1> 	xor	eax, eax ; 0
  7789                              <1> 	; 14/10/2017
  7790 0000EFD4 4A                  <1> 	dec	edx ; is there a limit ?
  7791 0000EFD5 7810                <1> 	js	short sysalloc_1 ;  0 -> 0FFFFFFFFh -> NO LIMIT
  7792 0000EFD7 42                  <1> 	inc	edx ; > 0
  7793                              <1> 	; Check upper address limit
  7794                              <1> 	;(round up to page borders)
  7795 0000EFD8 81C1FF0F0000        <1> 	add	ecx, PAGE_SIZE-1 ; 4095
  7796 0000EFDE 6681E100F0          <1> 	and	cx, ~PAGE_OFF ; not 4095
  7797 0000EFE3 39CA                <1> 	cmp	edx, ecx ; upper limit - block size
  7798 0000EFE5 7224                <1> 	jb	short sysalloc_err
  7799                              <1> sysalloc_1:
  7800                              <1> 	; EAX = Beginning address (physical)
  7801                              <1> 	; EAX = 0 -> Allocate mem block from the 1st proper aperture	
  7802                              <1> 	; ECX = Number of bytes to be allocated		
  7803 0000EFE7 E89564FFFF          <1> 	call	allocate_memory_block
  7804 0000EFEC 721D                <1> 	jc	short sysalloc_err
  7805                              <1> 	; 01/09/2017
  7806 0000EFEE 29C2                <1> 	sub	edx, eax ; upper limit address - beginning address
  7807 0000EFF0 760F                <1> 	jna	short sysalloc_3 ; begin addr not less than the limit
  7808 0000EFF2 39CA                <1> 	cmp	edx, ecx
  7809 0000EFF4 720B                <1> 	jb	short sysalloc_3 ; end address overs the limit
  7810                              <1> sysalloc_2:	
  7811                              <1> 	; EAX = Beginning (physical) addr of the allocated mem block
  7812                              <1> 	; ECX = Num of allocated bytes (rounded up to page borders) 
  7813 0000EFF6 50                  <1> 	push	eax ; * ; 04/03/2017	
  7814                              <1> 	; Here, requested contiquous memory pages have been allocated
  7815                              <1> 	; on Memory Allocation Table but user's page directory 
  7816                              <1> 	; and page tables have not been updated yet!
  7817 0000EFF7 51                  <1> 	push	ecx ; **
  7818                              <1> 	; ebx = virtual address (will be rounded up to page border)
  7819                              <1> 	; ecx = number of bytes to be deallocated
  7820                              <1> 	;	will be adjusted to ebx+ecx round down - ebx round up
  7821 0000EFF8 E8DF67FFFF          <1> 	call	deallocate_user_pages 
  7822 0000EFFD 731F                <1> 	jnc	short sysalloc_4 ; EAX = Deallocated memory bytes
  7823 0000EFFF 59                  <1> 	pop	ecx ; **
  7824 0000F000 58                  <1> 	pop	eax ; *
  7825                              <1> sysalloc_3:
  7826                              <1> 	; error !
  7827                              <1> 	; restore Memory Allocation Table Content
  7828 0000F001 E88866FFFF          <1> 	call	deallocate_memory_block
  7829 0000F006 31C0                <1> 	xor	eax, eax ; 0
  7830 0000F008 48                  <1> 	dec	eax ; 0FFFFFFFFh ; 15/05/2017
  7831 0000F009 EB09                <1> 	jmp	short sysalloc_wrong
  7832                              <1> sysalloc_err:
  7833 0000F00B 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  7834 0000F011 894D18              <1> 	mov	[ebp+24], ecx ; return to user with ecx value 
  7835                              <1> sysalloc_wrong:
  7836                              <1> 	; eax = 0FFFFFFFFh
  7837 0000F014 A3[64030300]        <1> 	mov	[u.r0], eax
  7838 0000F019 E924D7FFFF          <1> 	jmp	error
  7839                              <1> sysalloc_4:
  7840 0000F01E 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  7841 0000F024 894518              <1> 	mov	[ebp+24], eax ; return to user with ecx value 
  7842 0000F027 895D10              <1> 	mov	[ebp+16], ebx ; new value of ebx (rounded up)
  7843 0000F02A 89C1                <1> 	mov	ecx, eax ; byte count (from 'deallocate_user_pages')
  7844 0000F02C 5A                  <1> 	pop	edx ; ** ; discard (another) byte count
  7845 0000F02D 58                  <1> 	pop	eax ; *
  7846 0000F02E A3[64030300]        <1> 	mov	[u.r0], eax ; physical address
  7847                              <1> 	
  7848 0000F033 51                  <1> 	push	ecx ; 20/08/2017
  7849                              <1> 	;
  7850                              <1> 	; Write newly allocated contiguous (physical) pages
  7851                              <1> 	; on page dir and page tables of current user/process	
  7852                              <1> 	; as PRESENT, USER, WRITABLE
  7853                              <1> 	; (then clear allocated pages)
  7854 0000F034 E89868FFFF          <1> 	call	allocate_user_pages
  7855                              <1> 	;jnc	sysret ; OK! return to process with success...
  7856                              <1> 
  7857                              <1> 	; 20/08/2017 ('sysdma' modification)
  7858 0000F039 59                  <1> 	pop	ecx
  7859 0000F03A A1[64030300]        <1> 	mov	eax, [u.r0]   ; physical address (of the block)
  7860                              <1> 
  7861 0000F03F 721D                <1> 	jc	short sysalloc_6
  7862                              <1> 
  7863 0000F041 833D[846F0100]FF    <1> 	cmp	dword [dma_addr], 0FFFFFFFFh ; -1	
  7864 0000F048 0F8214D7FFFF        <1> 	jb	sysret
  7865                              <1> 
  7866 0000F04E A3[846F0100]        <1> 	mov	[dma_addr], eax ; save dma address for sysdma
  7867 0000F053 890D[886F0100]      <1> 	mov	[dma_size], ecx ; save dma buff size for sysdma
  7868                              <1> 
  7869 0000F059 E904D7FFFF          <1> 	jmp	sysret
  7870                              <1> 		
  7871                              <1> sysalloc_6:
  7872                              <1> 	;
  7873                              <1> 	; unexpected error ! insufficient memory !? conflict !?
  7874                              <1> 	; (!!?there is not a free page for a new page table?!!)
  7875                              <1> 	; We need to terminate process with error message !!!  
  7876                              <1> 	;
  7877 0000F05E 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  7878 0000F064 8B4D18              <1> 	mov	ecx, [ebp+24] ; byte count
  7879                              <1> 	
  7880                              <1> 	; 20/08/2017
  7881                              <1> 	;mov	eax, [u.r0]   ; physical address (of the block)
  7882                              <1> 	
  7883                              <1> 	;
  7884                              <1> 	; restore Memory Allocation Table Content
  7885 0000F067 E82266FFFF          <1> 	call	deallocate_memory_block
  7886                              <1> 	;
  7887 0000F06C 803D[225F0000]03    <1> 	cmp	byte [CRT_MODE], 3 ; 80x25 text mode?
  7888 0000F073 7407                <1> 	je	short sysalloc_7 ; yes
  7889                              <1> 	; Current mode is VGA (or CGA graphics) mode,
  7890                              <1> 	; We need to return to text mode for displaying
  7891                              <1> 	; error message just before 'sysexit'.  
  7892 0000F075 B003                <1> 	mov	al, 3
  7893 0000F077 E8F224FFFF          <1> 	call	_set_mode
  7894                              <1> sysalloc_7:
  7895 0000F07C BE[C3100100]        <1> 	mov	esi, beep_Insufficient_Memory ; error message
  7896 0000F081 E84773FFFF          <1> 	call	print_msg ; print/display the message
  7897 0000F086 B801000000          <1> 	mov	eax, 1 ; ax=1 is needed for 'sysexit' procedure
  7898 0000F08B E959D8FFFF          <1> 	jmp	sysexit ; and terminate the process !
  7899                              <1> 
  7900                              <1> sysdalloc:
  7901                              <1> 	; 19/02/2017 - TRDOS 386 (TRDOS v2.0)
  7902                              <1> 	; (TRDOS 386 feature only!)
  7903                              <1> 	;
  7904                              <1> 	; Deallocate Memory Block/Pages (for user)
  7905                              <1> 	; (Complementary call for sysalloc.)	
  7906                              <1> 	;
  7907                              <1> 	; INPUT ->
  7908                              <1> 	;	EBX = Virtual address (for user)
  7909                              <1> 	;	      (will be rounded up to page border)
  7910                              <1> 	;	ECX = Byte Count
  7911                              <1> 	;	     (will be adjusted to page borders)
  7912                              <1> 	;	If ICX = 0
  7913                              <1> 	;	   nothing to do
  7914                              <1> 	;	If EBX + ECX > User's ESP
  7915                              <1> 	;	   nothing to do		
  7916                              <1> 	; 
  7917                              <1> 	; Note: u.break control may be included in future versions	
  7918                              <1> 	;
  7919                              <1> 	; OUTPUT ->
  7920                              <1> 	;	If CF = 0
  7921                              <1> 	;	   EAX = Deallocated memory bytes
  7922                              <1> 	;	   EBX = Virtual address (as rounded up)	
  7923                              <1> 	;	IF CF = 1
  7924                              <1> 	;	   EAX = 0
  7925                              <1> 	;
  7926                              <1> 	; Note:	Main purpose of this call is to deallocate/release
  7927                              <1> 	;	previously allocated (physically) contiguous memory
  7928                              <1> 	;	pages but beginning (virtual) address may not be
  7929                              <1> 	;	followed by physically contiguous pages. So, this
  7930                              <1> 	;	system call will deallocate user's virtually
  7931                              <1> 	;	contiguous memory pages. Also, there is not any
  7932                              <1> 	;	objections to use this system call without sysalloc
  7933                              <1> 	;	system call; only possible objection is to lost data
  7934                              <1> 	;	within user's memory space, if the beginning address
  7935                              <1> 	;	and size is not proper.
  7936                              <1> 	;
  7937                              <1> 	; Note: Empty page tables will not be deallocated!!!
  7938                              <1> 	;       (they will be deallocated at process termination)
  7939                              <1> 	;
  7940                              <1> 	; Note: When the program terminates itself or when it is 
  7941                              <1> 	;	terminated by operating system kernel, all allocated
  7942                              <1> 	;	memory pages will be deallocated during termination
  7943                              <1> 	;	stage. So, 'sysdalloc' is not necessary except 
  7944                              <1> 	;	forgiving memory block to other programs/processes.
  7945                              <1> 	;	
  7946 0000F090 8B15[5C030300]      <1> 	mov	edx, [u.sp]
  7947 0000F096 8B420C              <1> 	mov	eax, [edx+12] ; user's stack pointer
  7948 0000F099 29C8                <1> 	sub	eax, ecx ; esp - byte count
  7949 0000F09B 24FC                <1> 	and	al, 0FCh ; dword alignment
  7950 0000F09D 39D8                <1> 	cmp	eax, ebx
  7951 0000F09F 7220                <1> 	jb	short sysdalloc_err ; deallocation overlaps with stack 	
  7952                              <1> 
  7953 0000F0A1 31C0                <1> 	xor	eax, eax
  7954 0000F0A3 21C9                <1> 	and	ecx, ecx
  7955 0000F0A5 7407                <1> 	jz	short sysdalloc_2
  7956                              <1> 	
  7957 0000F0A7 E83067FFFF          <1> 	call	deallocate_user_pages
  7958 0000F0AC 7213                <1> 	jc	short sysdalloc_err
  7959                              <1> 
  7960                              <1> sysdalloc_2:
  7961 0000F0AE A3[64030300]        <1> 	mov	[u.r0], eax
  7962 0000F0B3 8B2D[60030300]      <1> 	mov	ebp, [u.usp]
  7963 0000F0B9 895D10              <1> 	mov	[ebp+16], ebx ; new value of ebx
  7964 0000F0BC E9A1D6FFFF          <1> 	jmp	sysret
  7965                              <1> 
  7966                              <1> sysdalloc_err:
  7967 0000F0C1 A3[64030300]        <1> 	mov	[u.r0], eax ; 0
  7968 0000F0C6 E977D6FFFF          <1> 	jmp	error
  7969                              <1> 
  7970                              <1> syscalbac:
  7971                              <1> 	; SYS CALLBACK
  7972                              <1> 	; 03/08/2020
  7973                              <1> 	; 16/04/2017
  7974                              <1> 	; 14/04/2017
  7975                              <1> 	; 13/04/2017
  7976                              <1> 	; 28/02/2017
  7977                              <1> 	; 26/02/2017
  7978                              <1> 	; 24/02/2017
  7979                              <1> 	; 21/02/2017 - TRDOS 386 (TRDOS v2.0)
  7980                              <1> 	; (TRDOS 386 feature only!)
  7981                              <1> 	;
  7982                              <1> 	; Link or unlink IRQ callback service to/from user (ring 3)	
  7983                              <1> 	;
  7984                              <1> 	; INPUT ->
  7985                              <1> 	;	BL = IRQ number (Hardware interrupt request number)
  7986                              <1> 	;	     (0 t0 15 but IRQ 0,1,2,6,8,14,15 are prohibited)
  7987                              <1> 	;	     IRQ numbers 3,4,5,7,9,10,11,12,13 are valid
  7988                              <1> 	;	     (numbers >15 are invalid)
  7989                              <1> 	;
  7990                              <1> 	;	BH = 0 = Unlink IRQ (in BL) from user (ring 3) service
  7991                              <1> 	;	     1 = Link IRQ by using Signal Response Byte method
  7992                              <1> 	;	     2 = Link IRQ by using Callback service method 		
  7993                              <1> 	;	     3 = Link IRQ by using Auto Increment S.R.B. method 	
  7994                              <1> 	;	    >3 = invalid 
  7995                              <1> 	;	
  7996                              <1> 	;	CL = Signal Return/Response Byte value 
  7997                              <1> 	;
  7998                              <1> 	;	If BH = 3, kernel will put a counter value  ; 03/08/2020
  7999                              <1> 	;	          (into the S.R.B. addr)
  8000                              <1> 	;		  between 0 to 255. (start value = CL+1)
  8001                              <1> 	;	
  8002                              <1> 	;	NOTE: counter value, for example: even and odd numbers
  8003                              <1> 	;	      may be used for -audio- DMA buffer switch 
  8004                              <1> 	;	      within double buffer method, etc. 		
  8005                              <1> 	;
  8006                              <1> 	;	EDX = Signal return (Response) byte address
  8007                              <1> 	;	       		  - or -
  8008                              <1> 	;	      Interrupt/Callback service/routine address
  8009                              <1> 	; 	
  8010                              <1> 	;	      (virtual address in user's memory space)
  8011                              <1> 	;
  8012                              <1> 	; OUTPUT ->
  8013                              <1> 	;	CF = 0 & EAX = 0 -> Successful setting
  8014                              <1> 	;	CF = 1 & EAX > 0 -> IRQ is prohibited or locked 
  8015                              <1> 	;			by another process
  8016                              <1> 	;		 eax = ERR_PERM_DENIED -> prohibited or locked
  8017                              <1> 	;		 eax = ERR_INV_PARAMETER -> 
  8018                              <1> 	;		       invalid parameter/option or bad address
  8019                              <1> 	;
  8020                              <1> 	;	NOTE: Timer callbacks are set by using 'systimer'
  8021                              <1> 	;	      system call (IRQ 0, PIT and IRQ 8, RTC)
  8022                              <1> 	;
  8023                              <1> 	;	      Direct keyboard access is performed by using
  8024                              <1> 	;	      Keyboard Interrupt (INT 32h)	 	
  8025                              <1> 	;	
  8026                              <1> 	;	      It is prohibited here because:
  8027                              <1> 	;		1) Signal Response Byte method has not advantage
  8028                              <1> 	;		   against INT 32h, function AH = 1. Also,
  8029                              <1> 	;		   keyboard service interrupt will return with
  8030                              <1> 	;		   ascii and scan codes (AL, AH) while
  8031                              <1> 	;		   SRB method has only 1 byte space for ascii code
  8032                              <1> 	;		   or scan code. One byte signal response is used 
  8033                              <1> 	;		   for ensuring very simple and very fast
  8034                              <1> 	;		   virtual to physical memory address conversion
  8035                              <1> 	;		   without any memory page crossover risk. 
  8036                              <1> 	;		   (Otherwise double page conversion or word 
  8037                              <1> 	;		   alignment would be needed.)
  8038                              <1> 	;		2) Badly written user code (callback code)
  8039                              <1> 	;		   can prevent keyboard and timesharing functions
  8040                              <1> 	;		   of the operating system via continuous and long
  8041                              <1> 	;		   keyboard event handling by callback service.
  8042                              <1> 	;		   (It can cause to lose immediate keystroke 
  8043                              <1> 	;		   response from hardware to user.)
  8044                              <1> 	;		3) If user will check any keyboard events, 'getkey'
  8045                              <1> 	;		   (or 'getchar') must have more priority than other
  8046                              <1> 	;		   (video etc.) events because only control ability
  8047                              <1> 	;		   on a procedural infinite loop is a keyboard or
  8048                              <1> 	;		   mouse event. So user can use keyboard function
  8049                              <1> 	;		   at the end or at the beginning of a loop.
  8050                              <1> 	;		   In this case, INT 32h is used for that purpose
  8051                              <1> 	;		   and timer interrupt etc. callbacks can be used
  8052                              <1> 	;		   for dynamic and synchronized data refresh/transfer
  8053                              <1> 	;		   while cpu is in a static loop (without polling).
  8054                              <1> 	;		   Keyboard Int callback is not more useful because 
  8055                              <1> 	;		   already a manual check (a key is pressed or not)
  8056                              <1> 	;		   can be performed (via INT 32h, AH = 1) efficiently
  8057                              <1> 	;		   in a loop to prevent a locked infinitive loop.
  8058                              <1> 	;
  8059                              <1> 	;	    Disk IRQs (6,14,15) have been phohibited from ring 3 
  8060                              <1> 	;	    callback because, disk operations (file system services
  8061                              <1> 	;	    etc.) are independent from user program, for fast disk r/w.
  8062                              <1> 	;	    They are not more useful at ring 3 while they are in use
  8063                              <1> 	;	    by standard diskio functions which are mandatory part of 
  8064                              <1> 	;	    (monolithic) OS kernel and mainprog command interpreter.
  8065                              <1> 	;	    INT 33h diskio functions are enough for user level disk
  8066                              <1> 	;	    r/w.				
  8067                              <1> 	;
  8068                              <1> 	; TRDOS 386 - IRQ CALLBACK structures (parameters):
  8069                              <1> 	;	
  8070                              <1> 	;	   [u.irqlock] = 1 word, IRQ flags (0-15) that indicates
  8071                              <1> 	;			which IRQs are locked by (that) user.
  8072                              <1> 	;		        Lock and unlock (by user) will change
  8073                              <1> 	;			these flags or 'terminate process' (sysexit)
  8074                              <1> 	;			will clear these flags and unlock those IRQs.
  8075                              <1> 	;			               
  8076                              <1> 	;		   	Bit 0 is for IRQ 0 and Bit 15 is for IRQ 15
  8077                              <1> 	;
  8078                              <1> 	;	   IRQ(x).owner	 : 1 byte, user, [u.uno], 0 = free (unlocked)	
  8079                              <1> 	;
  8080                              <1> 	;	   IRQ(x).method : 1 byte for callback method & status
  8081                              <1> 	;			   0 = Signal Response Byte method
  8082                              <1> 	;			   1 = Callback service method
  8083                              <1> 	;			   >1 = invalid for current 'syscalback'.
  8084                              <1> 	;			or(+) 80h = IRQ is in use by system (ring 0)
  8085                              <1> 	;			            function (audio etc.) or
  8086                              <1> 	;			   	    a device driver.	   	
  8087                              <1> 	;			(system function will ignore the lock/owner)
  8088                              <1> 	;
  8089                              <1> 	;	   IRQ(x).srb	: 1 byte, Signal Return/Response byte value
  8090                              <1> 	;			  (a fixed value by user or a counter value
  8091                              <1> 	;			 from 0 to 255, which is increased by every
  8092                              <1> 	;			 interrupt just before putting it into 
  8093                              <1> 	;			 the Signal Response byte address
  8094                              <1> 	;			 (This is not used in callback serv method)
  8095                              <1> 	;	    	  
  8096                              <1> 	;	   IRQ(x).addr	: 1 dword
  8097                              <1> 	;			  Signal Response Byte address (physical)
  8098                              <1> 	;			  		-or-
  8099                              <1> 	;			  Callback service address (virtual)
  8100                              <1> 	;
  8101                              <1> 	;	   IRQ(x).dev	: 1 byte
  8102                              <1> 	;			  0 = Default device or kernel function
  8103                              <1> 	;			  		-or-
  8104                              <1> 	;			  1-255 = Assigned device driver number
  8105                              <1> 	;
  8106                              <1> 	;	   (x) = 3,4,5,7,9,10,11,12,13
  8107                              <1> 	;
  8108                              <1> 	;	
  8109                              <1> 	;	NOTE: If user's process/program calls the kernel (INT 40h)
  8110                              <1> 	;	      while it is already running in a (ring 3) callback
  8111                              <1> 	;	      service, kernel will force (convert) system call to
  8112                              <1> 	;	      'sysrele' (sys release). So, this feature provides
  8113                              <1> 	;	      easy and simple usage of callback services without
  8114                              <1> 	;	      falling into deepless <please 'callback me' then 
  8115                              <1> 	;	      let me 'callback you'> cycles! (User must return
  8116                              <1> 	;	      from callback service by using 'sysrele' system
  8117                              <1> 	;	      call, without a significant delay. Otherwise user
  8118                              <1> 	;	      process/program may be late to catch the next event
  8119                              <1> 	;	      within same callback purpose.	    		 	
  8120                              <1> 	;
  8121                              <1> 
  8122 0000F0CB 30C0                <1> 	xor	al, al ; the caller is 'syscalbac' sign/flag
  8123 0000F0CD E865180000          <1>  	call	set_irq_callback_service
  8124                              <1> 	; 16/04/2017
  8125 0000F0D2 A3[64030300]        <1> 	mov	[u.r0], eax
  8126 0000F0D7 0F8385D6FFFF        <1> 	jnc	sysret
  8127 0000F0DD A3[C8030300]        <1> 	mov	dword [u.error], eax
  8128 0000F0E2 E95BD6FFFF          <1> 	jmp	error
  8129                              <1> 
  8130                              <1> sysfpstat:
  8131                              <1> 	; 28/02/2017 - TRDOS 386 (TRDOS v2.0)
  8132                              <1> 	; (TRDOS 386 feature only!)
  8133                              <1> 	;
  8134                              <1> 	; Set or reset FPU registers save/restore option (for user)
  8135                              <1> 	;	       (during software task switching, wswap-rswap)
  8136                              <1> 	;
  8137                              <1> 	; INPUT ->
  8138                              <1> 	;	BL = 0 -> reset
  8139                              <1> 	;	BL = 1 -> set (FPU register will be saved and restored)
  8140                              <1> 	;	
  8141                              <1> 	; OUTPUT ->
  8142                              <1> 	;	cf = 0 -> no error, FPU is ready... 
  8143                              <1> 	;		  (EAX = 0)
  8144                              <1> 	;	Cf = 1 -> error, 80387 FPU is not ready !
  8145                              <1> 	;		  (EAX = 0FFFFFFFFh)
  8146                              <1> 
  8147 0000F0E7 31C0                <1> 	xor	eax, eax
  8148 0000F0E9 803D[7C650100]00    <1> 	cmp	byte [fpready], 0
  8149 0000F0F0 7613                <1> 	jna	short sysfpstat_err	
  8150                              <1> 
  8151 0000F0F2 80E301              <1> 	and	bl, 1 ; use BIT 0 only !
  8152 0000F0F5 881D[DA030300]      <1> 	mov	[u.fpsave], bl
  8153 0000F0FB A3[64030300]        <1> 	mov	[u.r0], eax ; 0
  8154 0000F100 E95DD6FFFF          <1> 	jmp	sysret	 	
  8155                              <1> 
  8156                              <1> sysfpstat_err:
  8157 0000F105 48                  <1> 	dec 	eax ; 0FFFFFFFFh
  8158 0000F106 A3[64030300]        <1> 	mov 	[u.r0], eax ; -1
  8159 0000F10B E932D6FFFF          <1> 	jmp 	error
  8160                              <1> 
  8161                              <1> sysdelete: ; Delete (Remove, Unlink) File
  8162                              <1> 	; 29/12/2017 (TRDOS 386 = TRDOS v2.0) 
  8163                              <1> 	;	
  8164                              <1>         ; INPUT ->
  8165                              <1>         ;          EBX = File name (ASCIIZ string) address
  8166                              <1> 	; OUTPUT ->
  8167                              <1> 	;          cf = 0 -> eax = 0
  8168                              <1> 	;          cf = 1 -> Error code in AL
  8169                              <1> 	;
  8170                              <1> 	; Modified Registers: EAX (at the return of system call)
  8171                              <1> 	;   
  8172                              <1> 
  8173 0000F110 89DE                <1> 	mov	esi, ebx
  8174                              <1> 	; file name is forced, change directory as temporary
  8175                              <1> 	;mov	ax, 1
  8176                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset
  8177                              <1> 	;call	set_working_path 
  8178 0000F112 E8680B0000          <1> 	call	set_working_path_x
  8179 0000F117 731D                <1> 	jnc	short sysdelete_1
  8180                              <1> 
  8181 0000F119 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
  8182 0000F11B 7505                <1> 	jnz	short sysdelete_err
  8183                              <1> 	; eax = 0
  8184                              <1> sysdelete_path_err:
  8185 0000F11D B813000000          <1> 	mov	eax, ERR_INV_PATH_NAME ; 'bad path name !'
  8186                              <1> sysdelete_err:
  8187 0000F122 A3[64030300]        <1> 	mov	[u.r0], eax
  8188 0000F127 A3[C8030300]        <1> 	mov	[u.error], eax
  8189 0000F12C E8230C0000          <1> 	call 	reset_working_path
  8190 0000F131 E90CD6FFFF          <1> 	jmp	error
  8191                              <1> sysdelete_1:
  8192                              <1> 	;mov	esi, FindFile_Name
  8193 0000F136 66B80018            <1> 	mov	ax, 1800h ; Only files
  8194 0000F13A E8A891FFFF          <1> 	call	find_first_file
  8195 0000F13F 72E1                <1> 	jc	short sysdelete_err
  8196                              <1> sysdelete_2:
  8197                              <1> 	; check file attributes
  8198                              <1> 
  8199                              <1> 	;test	bl, 17 ; system, hidden, readonly, directory
  8200 0000F141 F6C307              <1>         test	bl, 7 ; system, hidden, readonly 
  8201 0000F144 7407                <1>         jz	short sysdelete_3
  8202                              <1> 
  8203 0000F146 B80B000000          <1>         mov	eax, ERR_FILE_ACCESS ; 11 = 'permission denied !'
  8204 0000F14B EBD5                <1>         jmp	short sysdelete_err
  8205                              <1> sysdelete_3:
  8206 0000F14D 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  8207 0000F150 7407                <1> 	jz	short sysdelete_4
  8208 0000F152 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME ; 26 = 'invalid file name !'
  8209 0000F157 EBC9                <1>         jmp	short sysdelete_err
  8210                              <1> sysdelete_4:
  8211                              <1> 	;mov	bh, [LongName_EntryLength]
  8212 0000F159 883D[EE620100]      <1> 	mov	[DelFile_LNEL], bh ; Long name entry length (if > 0)
  8213                              <1> 	; edi = Directory Entry Offset (DirBuff)
  8214                              <1> 	; esi = Directory Entry (FFF Structure)
  8215 0000F15F E800BBFFFF          <1> 	call	remove_file
  8216 0000F164 72BC                <1> 	jc	short sysdelete_err
  8217                              <1> sysrmdir_5:
  8218 0000F166 31C0                <1> 	xor	eax, eax ; 0
  8219 0000F168 A3[64030300]        <1> 	mov	[u.r0], eax
  8220                              <1> 	;mov	[u.error], eax
  8221 0000F16D E8E20B0000          <1> 	call 	reset_working_path
  8222 0000F172 E9EBD5FFFF          <1> 	jmp	sysret
  8223                              <1> 
  8224                              <1> 
  8225                              <1> sysrmdir: ; Remove (Unlink) Directory
  8226                              <1> 	; 29/12/2017 (TRDOS 386 = TRDOS v2.0) 
  8227                              <1> 	;	
  8228                              <1>         ; INPUT ->
  8229                              <1>         ;          EBX = Pointer to directory name
  8230                              <1> 	; OUTPUT ->
  8231                              <1> 	;          cf = 0 -> eax = 0
  8232                              <1> 	;          cf = 1 -> Error code in AL
  8233                              <1> 	;
  8234                              <1> 	; Modified Registers: EAX (at the return of system call)
  8235                              <1> 	;  
  8236                              <1> 
  8237 0000F177 803D[B3030300]00    <1> 	cmp	byte [u.uno], 0  ; root (super user) ?
  8238 0000F17E 7614                <1> 	jna	short sysrmdir_0
  8239                              <1> 
  8240                              <1> 	;mov	dword [u.r0], ERR_PERM_DENIED
  8241 0000F180 B80B000000          <1> 	mov	eax, ERR_PERM_DENIED ; ERR_NOT_SUPERUSER
  8242 0000F185 A3[64030300]        <1> 	mov	[u.r0], eax
  8243 0000F18A A3[C8030300]        <1> 	mov	[u.error], eax
  8244 0000F18F E9AED5FFFF          <1> 	jmp	error
  8245                              <1> 
  8246                              <1> sysrmdir_0:
  8247 0000F194 89DE                <1> 	mov	esi, ebx
  8248                              <1> 	; file name is forced, change directory as temporary
  8249                              <1> 	;mov	ax, 1
  8250                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset
  8251                              <1> 	;call	set_working_path 
  8252 0000F196 E8E40A0000          <1> 	call	set_working_path_x
  8253 0000F19B 731D                <1> 	jnc	short sysrmdir_1
  8254                              <1> 
  8255 0000F19D 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
  8256 0000F19F 7505                <1> 	jnz	short sysrmdir_err
  8257                              <1> 	; eax = 0
  8258                              <1> sysrmdir_not_found:
  8259 0000F1A1 B80C000000          <1> 	mov	eax, ERR_DIR_NOT_FOUND ; Directory not found !
  8260                              <1> sysrmdir_err:
  8261 0000F1A6 A3[64030300]        <1> 	mov	[u.r0], eax
  8262 0000F1AB A3[C8030300]        <1> 	mov	[u.error], eax
  8263 0000F1B0 E89F0B0000          <1> 	call 	reset_working_path
  8264 0000F1B5 E988D5FFFF          <1> 	jmp	error
  8265                              <1> sysrmdir_1:
  8266                              <1> 	;mov	esi, FindFile_Name
  8267 0000F1BA 66B81008            <1> 	mov	ax, 0810h ; Only directories
  8268 0000F1BE E82491FFFF          <1> 	call	find_first_file
  8269 0000F1C3 7306                <1> 	jnc	short sysrmdir_2
  8270                              <1> 
  8271                              <1> 	; eax = 2 (File not found !)
  8272 0000F1C5 3C02                <1> 	cmp	al, 2 ; ERR_NOT_FOUND
  8273 0000F1C7 74D8                <1> 	je	short sysrmdir_not_found
  8274 0000F1C9 EBDB                <1> 	jmp	short sysrmdir_err
  8275                              <1> sysrmdir_2:
  8276                              <1> 	; check directory attributes
  8277                              <1> 
  8278 0000F1CB F6C307              <1>         test	bl, 7 ; system, hidden, readonly 
  8279 0000F1CE 7407                <1>         jz	short sysrmdir_3
  8280                              <1> 
  8281 0000F1D0 B80B000000          <1>         mov	eax, ERR_DIR_ACCESS ; 11 = 'permission denied !'
  8282 0000F1D5 EBCF                <1>         jmp	short sysrmdir_err
  8283                              <1> sysrmdir_3:
  8284 0000F1D7 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  8285 0000F1DA 7407                <1> 	jz	short sysrmdir_4
  8286                              <1> 	;mov	eax, ERR_NOT_DIR ; 'not a valid directory !'
  8287 0000F1DC B813000000          <1> 	mov	eax, ERR_INV_PATH_NAME ; 'bad path name !'
  8288 0000F1E1 EBC3                <1>         jmp	short sysrmdir_err
  8289                              <1> sysrmdir_4:
  8290                              <1> 	;mov	bh, [LongName_EntryLength]
  8291 0000F1E3 883D[EE620100]      <1> 	mov	[DelFile_LNEL], bh ; Long name entry length (if > 0)
  8292                              <1> 	; edi = Directory Entry Offset (DirBuff)
  8293                              <1> 	; esi = Directory Entry (FFF Structure)
  8294 0000F1E9 E8CE97FFFF          <1> 	call	delete_sub_directory
  8295 0000F1EE 0F8372FFFFFF        <1> 	jnc	sysrmdir_5
  8296                              <1> ;	jc	short sysrmdir_6
  8297                              <1> ;
  8298                              <1> ;	xor	eax, eax ; 0
  8299                              <1> ;sysrmdir_5:
  8300                              <1> ;	mov	[u.r0], eax
  8301                              <1> ;	;mov	[u.error], eax
  8302                              <1> ;	call 	reset_working_path
  8303                              <1> ;	jmp	sysret
  8304                              <1> sysrmdir_6:
  8305 0000F1F4 A3[64030300]        <1> 	mov	[u.r0], eax
  8306 0000F1F9 A3[C8030300]        <1> 	mov	[u.error], eax
  8307                              <1> 
  8308 0000F1FE 09C0                <1> 	or	eax, eax ; EAX = 0 -> Directory not empty!
  8309 0000F200 741C                <1> 	jz	short sysrmdir_9
  8310                              <1> 
  8311                              <1> 	; EAX > 0 -> Error code in AL (or AX or EAX)
  8312                              <1> 
  8313 0000F202 833D[A2600100]01    <1> 	cmp	dword [FAT_ClusterCounter], 1
  8314 0000F209 7209                <1> 	jb	short sysrmdir_8
  8315                              <1> sysrmdir_7:
  8316                              <1> 	; ESI = Logical DOS Drive Description Table address	
  8317 0000F20B 66BB00FF            <1> 	mov	bx, 0FF00h ; BH = FFh -> use ESI for Drive parameters
  8318                              <1> 	           ; BL = 0 -> Recalculate free cluster count
  8319 0000F20F E834D0FFFF          <1> 	call	calculate_fat_freespace	
  8320                              <1> sysrmdir_8:
  8321 0000F214 E83B0B0000          <1> 	call 	reset_working_path
  8322 0000F219 E924D5FFFF          <1> 	jmp	error
  8323                              <1> 
  8324                              <1> sysrmdir_9:
  8325 0000F21E A1[A2600100]        <1> 	mov	eax, [FAT_ClusterCounter]
  8326 0000F223 09C0                <1> 	or	eax, eax ; 0 ?
  8327 0000F225 0F847BFFFFFF        <1> 	jz	sysrmdir_err
  8328                              <1> 	; ESI = Logical DOS Drive Description Table address	
  8329 0000F22B 66BB01FF            <1> 	mov	bx, 0FF01h ; BH = FFh -> use ESI for Drive parameters
  8330                              <1> 	           ; BL = 1 -> add free clusters
  8331 0000F22F E814D0FFFF          <1> 	call	calculate_fat_freespace
  8332 0000F234 09C9                <1> 	or	ecx, ecx
  8333 0000F236 74DC                <1>         jz	short sysrmdir_8 ; ecx = 0 -> OK
  8334                              <1> 	; ecx > 0 -> Error (Recalculation is needed)
  8335 0000F238 EBD1                <1> 	jmp	short sysrmdir_7
  8336                              <1> 
  8337                              <1> 
  8338                              <1> syschdir: ; Change Current (Working) Drive & Directory (for user)
  8339                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
  8340                              <1> 	;	
  8341                              <1>         ; INPUT ->
  8342                              <1>         ;          EBX = Directory name (ASCIIZ string) address
  8343                              <1> 	; OUTPUT ->
  8344                              <1> 	;          cf = 0 -> eax = 0
  8345                              <1> 	;          cf = 1 -> Error code in AL
  8346                              <1> 	;
  8347                              <1> 	; Modified Registers: EAX (at the return of system call)
  8348                              <1> 	;
  8349                              <1> 	; NOTE: If drive name is not included, only the working
  8350                              <1> 	; directory (for user, not for drive/OS) will be chanded.
  8351                              <1> 	; If there is a drive name (as A:, B:, C:, D: etc.)
  8352                              <1> 	; at the beginning of the ASCIIZ (directory) string,
  8353                              <1> 	; working drive and working directory (for user) 
  8354                              <1> 	; will be changed together.
  8355                              <1> 	; (When the program is terminated, MainProg -internal 
  8356                              <1> 	; shell- will reset working directory to the previous
  8357                              <1> 	; -current- logical drive's current directory again.) 	
  8358                              <1>   
  8359 0000F23A 89DE                <1> 	mov	esi, ebx
  8360                              <1> 	; file name is not forced, change directory as temporary
  8361 0000F23C 31C0                <1> 	xor	eax, eax
  8362                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset
  8363                              <1> 	;call	set_working_path 
  8364 0000F23E E8400A0000          <1> 	call	set_working_path_xx
  8365 0000F243 731D                <1> 	jnc	short syschdir_ok
  8366 0000F245 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
  8367 0000F247 7505                <1> 	jnz	short syschdir_err
  8368                              <1> 	; eax = 0
  8369                              <1> syschdir_not_found:
  8370 0000F249 B80C000000          <1> 	mov	eax, ERR_DIR_NOT_FOUND ; Directory not found !
  8371                              <1> syschdir_err:
  8372 0000F24E A3[64030300]        <1> 	mov	[u.r0], eax
  8373 0000F253 A3[C8030300]        <1> 	mov	[u.error], eax
  8374 0000F258 E8F70A0000          <1> 	call 	reset_working_path
  8375 0000F25D E9E0D4FFFF          <1> 	jmp	error
  8376                              <1> syschdir_ok:
  8377 0000F262 31C0                <1> 	xor	eax, eax ; 0
  8378 0000F264 A3[64030300]        <1> 	mov	[u.r0], eax
  8379                              <1> 	;mov	[u.error], eax
  8380 0000F269 E9F4D4FFFF          <1> 	jmp	sysret
  8381                              <1> 
  8382                              <1> 
  8383                              <1> syschmod: ; Get & Change File (or Directory) Attributes
  8384                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
  8385                              <1> 	;	
  8386                              <1>         ; INPUT ->
  8387                              <1>         ;          EBX = File/Directory (ASCIIZ) name address
  8388                              <1> 	;	    CL = New attributes (if CL < 40h)
  8389                              <1> 	;	    CL >= 40h -> Get File Attributes		
  8390                              <1> 	; OUTPUT ->
  8391                              <1> 	;          cf = 0 -> EAX = File attributes (in AL)
  8392                              <1> 	;          cf = 1 -> Error code in AL
  8393                              <1> 	;
  8394                              <1> 	; Modified Registers: EAX (at the return of system call)
  8395                              <1> 	;  
  8396                              <1> 	; MSDOS File Attributes:    (bit value of attrib byte)
  8397                              <1> 	;	ATTR_READ_ONLY	=	01h  (bit 0, 'R')
  8398                              <1> 	;	ATTR_HIDDEN	=	02h  (bit 1, 'H')
  8399                              <1> 	;	ATTR_SYSTEM	=	04h  (bit 2, 'S')
  8400                              <1> 	;	ATTR_VOLUME_ID	=	08h  (bit 3)
  8401                              <1> 	;	ATTR_DIRECTORY	=	10h  (bit 4)
  8402                              <1> 	;	ATTR_ARCHIVE	=	20h  (bit 5, 'A')
  8403                              <1> 	;	ATTR_LONG_NAME	=	ATTR_READONLY |
  8404                              <1> 	;				ATTR_HIDDEN |
  8405                              <1> 	;				ATTR_SYSTEM |
  8406                              <1> 	;				ATTR_VOLUME_ID				
  8407                              <1> 	;	The upper two bits of attributes must be 0.
  8408                              <1> 
  8409                              <1> 	; Note:	* If ATTR_DIRECTORY is set, only directory names
  8410                              <1> 	;	  will be searched (and S,H,R,A attributeds of 
  8411                              <1> 	;	  the directory will be changed.)
  8412                              <1> 	;	* If ATTR_VOLUME_ID is set, 'syschmod' system call
  8413                              <1> 	;	  will return with 'permission denied' error.
  8414                              <1> 	;	* If ATTR_DIRECTORY is not set, only file names
  8415                              <1> 	;	  will be searched (and S,H,R,A attributes of the
  8416                              <1> 	;	  file will be changed.)
  8417                              <1> 	;
  8418                              <1> 	; (Ony Super User can change S,H,R attributes.) 
  8419                              <1> 
  8420 0000F26E 80F940              <1> 	cmp	cl, 40h	
  8421 0000F271 7327                <1> 	jnb	short syschmod_0
  8422                              <1> 
  8423 0000F273 F6C108              <1> 	test	cl, 08h ; ATTR_VOLUME_ID
  8424 0000F276 750E                <1> 	jnz	short syschmod_perm_err
  8425                              <1> 
  8426 0000F278 803D[B3030300]00    <1> 	cmp	byte [u.uno], 0  ; root (super user) ?
  8427 0000F27F 7619                <1> 	jna	short syschmod_0
  8428                              <1> 
  8429                              <1> 	; Not super user..
  8430 0000F281 F6C107              <1> 	test	cl, 07h	; S,H,R attributes
  8431 0000F284 7414                <1> 	jz	short syschmod_0
  8432                              <1> 
  8433                              <1> syschmod_perm_err:
  8434                              <1> 	;mov	dword [u.r0], ERR_PERM_DENIED
  8435 0000F286 B80B000000          <1> 	mov	eax, ERR_PERM_DENIED ; 'permission denied !'
  8436 0000F28B A3[64030300]        <1> 	mov	[u.r0], eax
  8437 0000F290 A3[C8030300]        <1> 	mov	[u.error], eax
  8438 0000F295 E9A8D4FFFF          <1> 	jmp	error
  8439                              <1> 
  8440                              <1> syschmod_0:
  8441 0000F29A 880D[3C630100]      <1> 	mov	[Attributes], cl
  8442 0000F2A0 89DE                <1> 	mov	esi, ebx
  8443                              <1> 	; file name is forced, change directory as temporary
  8444                              <1> 	;mov	ax, 1
  8445                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset
  8446                              <1> 	;call	set_working_path 
  8447 0000F2A2 E8D8090000          <1> 	call	set_working_path_x
  8448 0000F2A7 731D                <1> 	jnc	short syschmod_1
  8449 0000F2A9 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
  8450 0000F2AB 7505                <1> 	jnz	short syschmod_err
  8451                              <1> 	; eax = 0
  8452                              <1> syschmod_path_not_found:
  8453 0000F2AD B813000000          <1> 	mov	eax, ERR_INV_PATH_NAME ; 'Bad path name !'
  8454                              <1> syschmod_err:
  8455 0000F2B2 A3[64030300]        <1> 	mov	[u.r0], eax
  8456 0000F2B7 A3[C8030300]        <1> 	mov	[u.error], eax
  8457 0000F2BC E8930A0000          <1> 	call 	reset_working_path
  8458 0000F2C1 E97CD4FFFF          <1> 	jmp	error
  8459                              <1> syschmod_1:
  8460 0000F2C6 B008                <1> 	mov	al, 08h ; Except volume labels (& long names)
  8461 0000F2C8 A0[3C630100]        <1> 	mov	al, [Attributes]
  8462 0000F2CD 2410                <1> 	and	al, 10h ;
  8463                              <1> 	;mov	esi, FindFile_Name
  8464                              <1> 	;mov	ax, 1800h ; Only files
  8465                              <1> 	;mov	ax, 0810h ; Only directories
  8466 0000F2CF E81390FFFF          <1> 	call	find_first_file
  8467                              <1> 	;jnc	short syschmod_2
  8468 0000F2D4 72DC                <1> 	jc	short syschmod_err
  8469                              <1> 
  8470                              <1> 	;; eax = 2 (File not found !)
  8471                              <1> 	;cmp	al, 2 ; ERR_NOT_FOUND
  8472                              <1> 	;jne	short syschmod_err
  8473                              <1> 
  8474                              <1> 	;and	byte [Attributes], 10h
  8475                              <1> 	;jz	short syschmod_err
  8476                              <1> 
  8477                              <1> 	;; Directory not found !
  8478                              <1> 	;mov	al, 3 ; ERR_PATH_NOT_FOUND
  8479                              <1> 	;jmp	short syschmod_err
  8480                              <1> 
  8481                              <1> syschmod_2:
  8482 0000F2D6 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  8483 0000F2D9 7407                <1> 	jz	short syschmod_3
  8484 0000F2DB B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME ; 'invalid file name !'
  8485 0000F2E0 EBD0                <1>         jmp	short syschmod_err
  8486                              <1> syschmod_3:
  8487                              <1> 	; EDI = Directory buffer entry offset/address
  8488                              <1> 	; BL = File (or Directory) Attributes 
  8489                              <1> 	; mov	bl, [EDI+0Bh]
  8490                              <1> 
  8491                              <1> 	; check directory attributes
  8492 0000F2E2 8A3D[3C630100]      <1> 	mov	bh, [Attributes] ; new attributes
  8493 0000F2E8 80FF40              <1> 	cmp	bh, 40h  ;>=40 -> get file/directory attributes
  8494 0000F2EB 732D                <1> 	jnb	short syschmod_6
  8495                              <1> 
  8496                              <1> 	; set file/directory attributes
  8497 0000F2ED F6C307              <1> 	test	bl, 7 ; system, hidden, readonly 
  8498 0000F2F0 7409                <1>         jz	short syschmod_4
  8499                              <1> 
  8500 0000F2F2 803D[B3030300]00    <1> 	cmp	byte [u.uno], 0  ; root (super user) ?
  8501 0000F2F9 778B                <1> 	ja	short syschmod_perm_err
  8502                              <1> syschmod_4:
  8503 0000F2FB 66817F0CA101        <1> 	cmp	word [edi+DirEntry_NTRes], 01A1h ; Singlix FS
  8504 0000F301 7424                <1> 	je	short syschmod_7
  8505                              <1> 
  8506 0000F303 887F0B              <1> 	mov	[edi+0Bh], bh    ; Attributes (New!)
  8507                              <1> 
  8508 0000F306 C605[AC600100]02    <1> 	mov	byte [DirBuff_ValidData], 2 ; modified sign
  8509                              <1> 					    ; to force write	
  8510 0000F30D E80AB6FFFF          <1> 	call 	save_directory_buffer
  8511 0000F312 729E                <1> 	jc	short syschmod_err
  8512                              <1> 
  8513                              <1> syschmod_5:
  8514 0000F314 8A1D[3C630100]      <1> 	mov	bl, [Attributes]
  8515                              <1> syschmod_6:
  8516 0000F31A 0FB6C3              <1> 	movzx	eax, bl
  8517 0000F31D A3[64030300]        <1> 	mov	[u.r0], eax
  8518                              <1> 	;mov	dword [u.error], 0
  8519 0000F322 E93BD4FFFF          <1> 	jmp	sysret
  8520                              <1> 
  8521                              <1> syschmod_7:
  8522 0000F327 29C0                <1> 	sub	eax, eax
  8523 0000F329 8A25[AA600100]      <1>         mov     ah, [DirBuff_DRV]
  8524 0000F32F BE00010900          <1> 	mov	esi, Logical_DOSDisks
  8525 0000F334 01C6                <1>         add     esi, eax
  8526 0000F336 807E04A1            <1>         cmp     byte [esi+LD_FSType], 0A1h
  8527 0000F33A 7307                <1> 	jnc	short syschmod_8
  8528 0000F33C B01D                <1> 	mov	al, ERR_INV_DATA ; 29 = Invalid Data
  8529 0000F33E E96FFFFFFF          <1> 	jmp	syschmod_err
  8530                              <1> 
  8531                              <1> syschmod_8:
  8532                              <1> 	; BH = New MS-DOS File Attributes
  8533 0000F343 88F8                <1> 	mov	al, bh ; File/Directory Attributes
  8534 0000F345 30E4                <1> 	xor	ah, ah ; Attributes in MS-DOS format sign	  
  8535 0000F347 E8F9A0FFFF          <1> 	call	change_fs_file_attributes
  8536 0000F34C 0F8260FFFFFF        <1> 	jc	syschmod_err
  8537 0000F352 EBC0                <1> 	jmp	short syschmod_5
  8538                              <1> 
  8539                              <1> 
  8540                              <1> sysdrive: ; Get/Set Current (Working) Drive (for user)
  8541                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
  8542                              <1> 	;	
  8543                              <1>         ; INPUT ->
  8544                              <1>         ;          BL = Logical DOS Drive number (0=A: ... 2=C:)
  8545                              <1> 	;	   If BL = 0FFh -> Get Current Drive 	
  8546                              <1> 	; OUTPUT ->
  8547                              <1> 	;          cf = 0 -> 
  8548                              <1> 	;		   AL = Current Drive number	
  8549                              <1> 	;		   AH = The Last Logical DOS Drive no.
  8550                              <1> 	;          cf = 1 -> Error code in AL
  8551                              <1> 	;
  8552                              <1> 	; Modified Registers: EAX (at the return of system call)
  8553                              <1> 	;
  8554                              <1> 	; NOTE: If the requested logical dos drive is ready, 
  8555                              <1> 	;	it's current current directory will be the user's
  8556                              <1> 	;	(program's) current directory.
  8557                              <1> 	;	(When the program is terminated, MainProg -internal 
  8558                              <1> 	;	shell- will reset the previous -current- logical drive
  8559                              <1> 	;       as current drive again).	
  8560                              <1>   
  8561 0000F354 80FBFF              <1> 	cmp	bl, 0FFh
  8562 0000F357 7435                <1> 	je	short sysdrive_ok
  8563 0000F359 3A1D[610D0100]      <1> 	cmp	bl, [Last_DOS_DiskNo]
  8564 0000F35F 771E                <1> 	ja	short sysdrive_err	
  8565                              <1> 
  8566                              <1> 	; Save current drive and reset mode
  8567                              <1> 	; for 'reset_working_path' procedure (for MainProg)
  8568 0000F361 30C0                <1> 	xor	al, al
  8569 0000F363 66A3[78650100]      <1> 	mov	[SWP_Mode], ax ; ah = 0
  8570 0000F369 A0[86590100]        <1> 	mov	al, [Current_Drv]
  8571 0000F36E FEC4                <1> 	inc	ah ; mov ah, 1
  8572 0000F370 66A3[7A650100]      <1> 	mov	[SWP_DRV], ax 
  8573                              <1> 
  8574 0000F376 88DA                <1> 	mov	dl, bl
  8575 0000F378 E8C77BFFFF          <1> 	call	change_current_drive
  8576 0000F37D 730F                <1> 	jnc	short sysdrive_ok
  8577                              <1> sysdrive_err:
  8578 0000F37F C705[64030300]0F00- <1> 	mov	dword [u.r0], ERR_DRV_NOT_RDY ; 'drive not ready !'
  8578 0000F387 0000                <1>
  8579 0000F389 E9B4D3FFFF          <1> 	jmp	error
  8580                              <1> sysdrive_ok:
  8581 0000F38E A0[86590100]        <1> 	mov	al, [Current_Drv]
  8582 0000F393 8A25[610D0100]      <1> 	mov	ah, [Last_DOS_DiskNo]
  8583 0000F399 A3[64030300]        <1> 	mov	[u.r0], eax
  8584 0000F39E E9BFD3FFFF          <1> 	jmp	sysret
  8585                              <1> 
  8586                              <1> 
  8587                              <1> sysdir: ; Get Current (Working) Drive & Directory (for user)
  8588                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
  8589                              <1> 	;	
  8590                              <1>         ; INPUT ->
  8591                              <1>         ;          EBX = Current directory name buffer address
  8592                              <1> 	;		(Buffer length = 92 bytes)
  8593                              <1> 	; OUTPUT ->
  8594                              <1> 	;          AL = Current drive (0=A: .. 2=C:)
  8595                              <1> 	;	   If CF = 1 -> AL = error code
  8596                              <1> 	;
  8597                              <1> 	; Modified Registers: EAX (at the return of system call)
  8598                              <1> 	;
  8599                              <1> 	; Note: Required directory name buffer length may be 
  8600                              <1> 	;	<= 92 bytes for current TRDOS 386 version.
  8601                              <1> 	;	(7*12 name chars + 7 slash + 0)
  8602                              <1> 
  8603 0000F3A3 89E5                <1> 	mov	ebp, esp
  8604 0000F3A5 83EC60              <1> 	sub	esp, 96
  8605 0000F3A8 53                  <1> 	push	ebx ; User's buffer address
  8606 0000F3A9 30D2                <1> 	xor	dl, dl ; 0 = current drive
  8607 0000F3AB E890AAFFFF          <1>   	call	get_current_directory
  8608 0000F3B0 72CD                <1> 	jc	short sysdrive_err ; 'drive not ready !' error
  8609 0000F3B2 89E6                <1> 	mov	esi, esp ; System's buffer address
  8610 0000F3B4 5F                  <1> 	pop	edi  ; User's buffer address
  8611                              <1> 	; ecx = transfer (byte) count (<=92)
  8612 0000F3B5 E843F4FFFF          <1> 	call	transfer_to_user_buffer
  8613 0000F3BA 89EC                <1> 	mov	esp, ebp
  8614 0000F3BC 730F                <1> 	jnc	short sysdir_ok
  8615                              <1> sysdir_err:
  8616 0000F3BE C705[64030300]2E00- <1> 	mov	dword [u.r0], ERR_BUFFER  ; 'buffer error !'
  8616 0000F3C6 0000                <1>
  8617 0000F3C8 E975D3FFFF          <1> 	jmp	error
  8618                              <1> sysdir_ok:	
  8619 0000F3CD 8A0D[86590100]      <1> 	mov	cl, [Current_Drv]
  8620 0000F3D3 890D[64030300]      <1> 	mov	[u.r0], ecx
  8621 0000F3D9 E984D3FFFF          <1> 	jmp	sysret
  8622                              <1> 
  8623                              <1> 
  8624                              <1> sysldrvt: ; Get copy of Logical DOS Drive Description Table
  8625                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
  8626                              <1> 	;	
  8627                              <1>         ; INPUT ->
  8628                              <1> 	;	    BL = Logical DOS drive number (zero based)	
  8629                              <1>         ;          ECX = Logical DOS drv desc table buffer addr
  8630                              <1> 	;		(Buffer length = 256 bytes)
  8631                              <1> 	; OUTPUT ->
  8632                              <1> 	;          cf = 0 -> 
  8633                              <1> 	;		   AL = Current Drive number	
  8634                              <1> 	;		   AH = The Last Logical DOS Drive no.
  8635                              <1> 	;          cf = 1 -> Error code in AL
  8636                              <1> 	;		   AH = The Last Logical DOS Drive no.
  8637                              <1> 	;
  8638                              <1> 	; Modified Registers: EAX (at the return of system call)
  8639                              <1> 	;
  8640                              <1> 	; Note: Required description table buffer length is
  8641                              <1> 	;	256 bytes for current TRDOS 386 version.
  8642                              <1> 	
  8643 0000F3DE 89CF                <1> 	mov	edi, ecx ; Destination address (user space)
  8644 0000F3E0 88DC                <1> 	mov	ah, bl
  8645 0000F3E2 30C0                <1> 	xor	al, al
  8646 0000F3E4 BE00010900          <1> 	mov	esi, Logical_DOSDisks
  8647 0000F3E9 01C6                <1> 	add	esi, eax ; Source address (system space)	 
  8648 0000F3EB B900010000          <1> 	mov	ecx, 256 ; Byte count 
  8649                              <1> 			 ; Logical Dos Drv Desc Table size
  8650 0000F3F0 E808F4FFFF          <1> 	call	transfer_to_user_buffer
  8651 0000F3F5 72C7                <1> 	jc	short sysdir_err
  8652 0000F3F7 8A2D[610D0100]      <1> 	mov	ch, [Last_DOS_DiskNo]
  8653 0000F3FD EBCE                <1> 	jmp	short sysdir_ok
  8654                              <1> 
  8655                              <1> 
  8656                              <1> systime: ; Get System Date&Time
  8657                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
  8658                              <1> 	;	
  8659                              <1>         ; INPUT -> BL =
  8660                              <1> 	;	    0 = Get Date&Time in Unix/Epoch format
  8661                              <1> 	;	    1 = Get Time in MSDOS format
  8662                              <1> 	;	    2 = Get Date in MSDOS format
  8663                              <1> 	;	    3 = Get Date&Time in MSDOS format
  8664                              <1> 	;	    4 & other values =
  8665                              <1> 	;		System timer ticks will be returned
  8666                              <1> 	;		in EAX and Carry Flag will be set.
  8667                              <1> 	;		(CF will not be set if BL = 4)	 	
  8668                              <1> 	; OUTPUT ->
  8669                              <1> 	;	For BL input = 3
  8670                              <1> 	;          EAX = Current Time (RTC)
  8671                              <1> 	;		AL = Second (DL in MSDOS)
  8672                              <1> 	;		AH = Minute (CL in MSDOS)
  8673                              <1> 	;	   	HW of EAX = Hour (CH in MSDOS)	
  8674                              <1> 	;	   EDX = Current System Date (RTC)
  8675                              <1> 	;		DL = Day (DL in MSDOS)
  8676                              <1> 	;		DH = Month (DH in MSDOS)
  8677                              <1> 	;		HW of EDX = Year (CX in MSDOS)	
  8678                              <1> 	;
  8679                              <1> 	;	For BL input = 2
  8680                              <1> 	;	   EAX = Current System Date (RTC)
  8681                              <1> 	;		DL = Day (DL in MSDOS)
  8682                              <1> 	;		DH = Month (DH in MSDOS)
  8683                              <1> 	;		HW of EDX = Year (CX in MSDOS)
  8684                              <1> 	;
  8685                              <1> 	;	For BL input = 1
  8686                              <1> 	;          EAX = Current Time (RTC)
  8687                              <1> 	;		AL = Second (DL in MSDOS)
  8688                              <1> 	;		AH = Minute (CL in MSDOS)
  8689                              <1> 	;	   	HW of EAX = Hour (CH in MSDOS)	
  8690                              <1> 	;
  8691                              <1> 	;	For BL input = 0
  8692                              <1> 	;          EAX = Unix (Epoch) Time Ticks/Seconds
  8693                              <1> 	;
  8694                              <1> 	;	For BL input  = 4
  8695                              <1> 	;	   EAX = System timer ticks
  8696                              <1> 	;
  8697                              <1> 	;	If CF = 1 (for other values of BL input)
  8698                              <1> 	;	   EAX = System timer ticks (no error code!)	
  8699                              <1> 	;		
  8700                              <1> 	; Modified Registers: EAX, (EDX)
  8701                              <1> 	;		 (at the return of system call)
  8702                              <1> 	;
  8703                              <1> 
  8704 0000F3FF 20DB                <1> 	and	bl, bl
  8705 0000F401 750F                <1> 	jnz	short systime_1
  8706 0000F403 E82C71FFFF          <1> 	call	epoch
  8707                              <1> systime_0:
  8708 0000F408 A3[64030300]        <1> 	mov	[u.r0], eax
  8709 0000F40D E950D3FFFF          <1> 	jmp	sysret
  8710                              <1> systime_1:
  8711 0000F412 80FB04              <1> 	cmp	bl, 4
  8712 0000F415 7211                <1> 	jb	short systime_2
  8713 0000F417 A1[40590100]        <1> 	mov	eax, [TIMER_LH] ; 18.2 Hz timer ticks
  8714                              <1> 				; Note: [TIMER_LH] may be set
  8715                              <1> 				; to wrong timer value due to
  8716                              <1> 				; program functions.
  8717                              <1> 				; (This value must not be
  8718                              <1> 				; accepted as [TIMER_LH]/18.2
  8719                              <1> 				; seconds since the midnight.)
  8720 0000F41C 76EA                <1> 	jna	short systime_0
  8721 0000F41E A3[64030300]        <1> 	mov	[u.r0], eax	
  8722 0000F423 E91AD3FFFF          <1> 	jmp	error ; cf = 1 & [u.r0] = eax = timer ticks 
  8723                              <1> 
  8724                              <1> systime_2:
  8725                              <1> 	;push	ebx
  8726 0000F428 E86970FFFF          <1> 	call	get_rtc_date_time
  8727                              <1> 	;pop	ebx
  8728 0000F42D F6C301              <1> 	test	bl, 1
  8729 0000F430 7429                <1> 	jz	short systime_4
  8730 0000F432 30E4                <1> 	xor	ah, ah
  8731 0000F434 A0[B4550100]        <1> 	mov	al, [hour]
  8732 0000F439 88C2                <1> 	mov	dl, al
  8733 0000F43B C1E010              <1> 	shl	eax, 16
  8734 0000F43E A0[B8550100]        <1> 	mov	al, [second]
  8735 0000F443 8A25[B6550100]      <1> 	mov	ah, [minute]
  8736 0000F449 F6C302              <1> 	test	bl, 2
  8737 0000F44C 74BA                <1> 	jz	short systime_0
  8738                              <1> 	; Check time & date match risk 
  8739                              <1> 	; (23:59:59 may cause to wrong
  8740                              <1> 	; date -new day with previous date-...)
  8741 0000F44E 80FA17              <1> 	cmp	dl, 23
  8742 0000F451 7206                <1> 	jb	short systime_3
  8743 0000F453 663D3B3B            <1> 	cmp	ax, (59*256)+59 ; if hour is 23:59:59
  8744 0000F457 73CF                <1> 	jnb	short systime_2 ; wait for 1 second
  8745                              <1> systime_3:
  8746                              <1> 	; eax = time
  8747 0000F459 89C6                <1> 	mov	esi, eax
  8748                              <1> systime_4:	
  8749 0000F45B 66A1[AE550100]      <1> 	mov	ax, [year]
  8750 0000F461 C1E010              <1> 	shl	eax, 16
  8751 0000F464 A0[B2550100]        <1> 	mov	al, [day]
  8752 0000F469 8A25[B0550100]      <1> 	mov	ah, [month]
  8753                              <1> 	; eax = date
  8754 0000F46F 80E301              <1> 	and	bl, 1
  8755 0000F472 7494                <1> 	jz	short systime_0
  8756 0000F474 96                  <1> 	xchg	esi, eax
  8757                              <1> 	; eax = time, esi = date
  8758 0000F475 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; EBP points to user's registers
  8759                              <1> 	; (user) edx <-- (system) esi
  8760 0000F47B 897514              <1> 	mov	[ebp+20], esi ; return to user with EDX value 
  8761 0000F47E EB88                <1> 	jmp	short systime_0
  8762                              <1> 
  8763                              <1> 
  8764                              <1> sysstime: ; Set System Date&Time
  8765                              <1> 	; 31/12/2017
  8766                              <1> 	; 30/12/2017 (TRDOS 386 = TRDOS v2.0) 
  8767                              <1> 	;	
  8768                              <1>         ; INPUT -> BL =
  8769                              <1> 	;	    0 = Set Date&Time in Unix/Epoch format
  8770                              <1> 	;	    1 = Set Time in MSDOS format
  8771                              <1> 	;	    2 = Set Date in MSDOS format
  8772                              <1> 	;	    3 = Set Date&Time in MSDOS format
  8773                              <1> 	;	    4 = Set System Timer (Ticks)
  8774                              <1> 	;	    5 = Convert/Save current time to/as
  8775                              <1> 	;		18.2 Hz system timer ticks
  8776                              <1> 	;	    6 = Convert MSDOS Date&Time to UNIX format
  8777                              <1> 	;		without setting system date&time ; (test)
  8778                              <1> 	;	    7 = Convert UNIX Date&Time to MSDOS format
  8779                              <1> 	;		without setting system date&time ; (test)
  8780                              <1> 	;	   8-0FFh = invalid !
  8781                              <1> 	;	  ECX = Time (or Timer) value in selected format  	
  8782                              <1> 	;	  EDX = Date value in MSDOS format if BL=2,3,6	
  8783                              <1> 	; 	
  8784                              <1> 	; OUTPUT ->
  8785                              <1> 	;	If CF = 0 ->
  8786                              <1> 	;          EAX = Set value
  8787                              <1> 	;	If CF = 1 -> (invalid BL input)
  8788                              <1> 	;	   EAX = Ticks count [TIMER_LH]	
  8789                              <1> 	;
  8790                              <1> 
  8791 0000F480 20DB                <1> 	and	bl, bl ; 0
  8792 0000F482 7511                <1> 	jnz	short sysstime_0
  8793 0000F484 89C8                <1> 	mov	eax, ecx
  8794 0000F486 E83371FFFF          <1> 	call	convert_from_epoch
  8795 0000F48B E8DF71FFFF          <1> 	call	set_rtc_date_time
  8796 0000F490 E9CDD2FFFF          <1> 	jmp	sysret
  8797                              <1> sysstime_0:
  8798 0000F495 80FB08              <1> 	cmp	bl, 8
  8799 0000F498 722D                <1> 	jb	short sysstime_1
  8800                              <1> 	; invalid input (>7)
  8801 0000F49A A1[40590100]        <1> 	mov	eax, [TIMER_LH] ; 18.2 Hz timer ticks
  8802                              <1> 				; Note: [TIMER_LH] may be set
  8803                              <1> 				; to wrong timer value due to
  8804                              <1> 				; program functions.
  8805                              <1> 				; (This value must not be
  8806                              <1> 				; accepted as [TIMER_LH]/18.2
  8807                              <1> 				; seconds since the midnight.)
  8808 0000F49F A3[64030300]        <1> 	mov	[u.r0], eax	
  8809 0000F4A4 E999D2FFFF          <1> 	jmp	error ; cf = 1 & [u.r0] = eax = timer ticks 
  8810                              <1> 
  8811                              <1> sysstime_8:	
  8812                              <1> 	; BL = 7
  8813 0000F4A9 89C8                <1> 	mov	eax, ecx ; seconds since 1/1/1970 00:00:00
  8814 0000F4AB E80E71FFFF          <1> 	call	convert_from_epoch
  8815 0000F4B0 30E4                <1> 	xor	ah, ah
  8816 0000F4B2 A0[B4550100]        <1> 	mov	al, [hour]
  8817 0000F4B7 C1E010              <1> 	shl	eax, 16
  8818 0000F4BA A0[B8550100]        <1> 	mov	al, [second]
  8819 0000F4BF 8A25[B6550100]      <1> 	mov	ah, [minute]
  8820 0000F4C5 EB92                <1> 	jmp	short systime_3
  8821                              <1> 
  8822                              <1> sysstime_1:
  8823 0000F4C7 80FB04              <1> 	cmp	bl, 4
  8824 0000F4CA 743F                <1> 	je	short sysstime_2 ; set system timer ticks	
  8825 0000F4CC 80FB05              <1> 	cmp	bl, 5
  8826 0000F4CF 754B                <1> 	jne	short sysstime_4
  8827                              <1> 	; convert current time to system timer ticks (18.2Hz)
  8828 0000F4D1 E8C06FFFFF          <1> 	call	get_rtc_date_time
  8829 0000F4D6 0FB60D[B4550100]    <1> 	movzx	ecx, byte [hour]
  8830 0000F4DD B8100E0000          <1> 	mov	eax, 60*60 ; 1 hour = 3600 seconds
  8831 0000F4E2 F7E1                <1> 	mul	ecx
  8832 0000F4E4 89C3                <1> 	mov	ebx, eax	
  8833 0000F4E6 B13C                <1> 	mov	cl, 60  ; 1 minute = 60 seconds
  8834 0000F4E8 0FB605[B6550100]    <1> 	movzx	eax, byte [minute]
  8835 0000F4EF F7E1                <1> 	mul	ecx
  8836 0000F4F1 01D8                <1> 	add	eax, ebx  
  8837 0000F4F3 8A0D[B8550100]      <1> 	mov	cl, [second]
  8838 0000F4F9 01C8                <1> 	add	eax, ecx
  8839 0000F4FB B1B6                <1> 	mov	cl, 182
  8840 0000F4FD F7E1                <1> 	mul	ecx
  8841 0000F4FF 83C009              <1> 	add	eax, 9
  8842 0000F502 83D200              <1> 	adc	edx, 0
  8843 0000F505 B10A                <1> 	mov	cl, 10
  8844 0000F507 F7F1                <1> 	div	ecx
  8845                              <1> 	; eax = ((182*seconds)+9)/10
  8846 0000F509 89C1                <1> 	mov	ecx, eax
  8847                              <1> sysstime_2:
  8848 0000F50B 890D[40590100]      <1> 	mov	[TIMER_LH], ecx ; 18.2 * seconds
  8849                              <1> sysstime_3:
  8850 0000F511 890D[64030300]      <1> 	mov	[u.r0], ecx
  8851 0000F517 E946D2FFFF          <1> 	jmp	sysret
  8852                              <1> sysstime_4:
  8853 0000F51C 80FB06              <1> 	cmp	bl, 6
  8854 0000F51F 7788                <1> 	ja	short sysstime_8
  8855                              <1> 
  8856 0000F521 890D[64030300]      <1> 	mov	[u.r0], ecx
  8857                              <1> 
  8858 0000F527 880D[B8550100]      <1> 	mov	[second], cl
  8859 0000F52D 882D[B6550100]      <1> 	mov	[minute], ch
  8860 0000F533 C1E910              <1> 	shr	ecx, 16
  8861 0000F536 880D[B4550100]      <1> 	mov	[hour], cl
  8862                              <1> 	; BL = 1,2,3,6
  8863 0000F53C 80FB01              <1> 	cmp	bl, 1
  8864 0000F53F 762A                <1> 	jna	short sysstime_5
  8865                              <1> 	; BL = 2,3,6
  8866 0000F541 8815[B2550100]      <1> 	mov	[day], dl
  8867 0000F547 8835[B0550100]      <1> 	mov	[month], dh
  8868 0000F54D C1EA10              <1> 	shr	edx, 16
  8869 0000F550 668915[AE550100]    <1> 	mov	[year], dx
  8870 0000F557 80E303              <1> 	and	bl, 3
  8871 0000F55A 742D                <1> 	jz	short sysstime_7 ; 6
  8872                              <1> 	; BL = 2,3
  8873 0000F55C F6C301              <1> 	test	bl, 1
  8874 0000F55F 7419                <1> 	jz	short sysstime_6 ; 2
  8875                              <1> 	; BL = 3
  8876 0000F561 E80971FFFF          <1> 	call	set_rtc_date_time
  8877 0000F566 E9F7D1FFFF          <1> 	jmp	sysret
  8878                              <1> sysstime_5:
  8879                              <1> 	; BL = 1
  8880 0000F56B E84071FFFF          <1> 	call	set_time_bcd
  8881 0000F570 E80565FFFF          <1> 	call	set_rtc_time
  8882 0000F575 E9E8D1FFFF          <1> 	jmp	sysret	
  8883                              <1> sysstime_6:
  8884                              <1> 	; BL = 2
  8885 0000F57A E80471FFFF          <1> 	call	set_date_bcd
  8886 0000F57F E86565FFFF          <1> 	call	set_rtc_date
  8887 0000F584 E9D9D1FFFF          <1> 	jmp	sysret
  8888                              <1> sysstime_7:
  8889                              <1> 	; BL = 6
  8890                              <1> 	; [year], [month], [day], 
  8891                              <1> 	; [hour], [minute], [second]
  8892 0000F589 E8AB6FFFFF          <1> 	call	convert_to_epoch
  8893 0000F58E 89C1                <1> 	mov	ecx, eax ; seconds since 1/1/1970 00:00:00
  8894 0000F590 E97CFFFFFF          <1> 	jmp	sysstime_3
  8895                              <1> 
  8896                              <1> sysrename: ; Rename File (or Directory)
  8897                              <1> 	; 31/12/2017 (TRDOS 386 = TRDOS v2.0) 
  8898                              <1> 	;	
  8899                              <1>         ; INPUT ->
  8900                              <1>         ;          EBX = File/Directory (ASCIIZ) name address
  8901                              <1> 	;	   ECX = New name (in same dir, no path name)			
  8902                              <1> 	; OUTPUT ->
  8903                              <1> 	;          cf = 0 -> EAX = 0
  8904                              <1> 	;          cf = 1 -> Error code in AL
  8905                              <1> 
  8906 0000F595 803D[B3030300]00    <1> 	cmp	byte [u.uno], 0  ; root (super user) ?
  8907 0000F59C 7614                <1> 	jna	short sysrename_0
  8908                              <1> 
  8909                              <1> sysrename_perm_err:
  8910                              <1> 	;mov	dword [u.r0], ERR_PERM_DENIED
  8911 0000F59E B80B000000          <1> 	mov	eax, ERR_PERM_DENIED ; 'permission denied !'
  8912 0000F5A3 A3[64030300]        <1> 	mov	[u.r0], eax
  8913 0000F5A8 A3[C8030300]        <1> 	mov	[u.error], eax
  8914 0000F5AD E990D1FFFF          <1> 	jmp	error
  8915                              <1> 
  8916                              <1> sysrename_0:
  8917 0000F5B2 51                  <1> 	push	ecx ; new file name address (in user space)
  8918 0000F5B3 89DE                <1> 	mov	esi, ebx
  8919                              <1> 	; file name is forced, change directory as temporary
  8920                              <1> 	;mov	ax, 1
  8921                              <1> 	;mov	[FFF_Valid], ah ; 0 ; reset
  8922                              <1> 	;call	set_working_path 
  8923 0000F5B5 E8C5060000          <1> 	call	set_working_path_x
  8924 0000F5BA 731E                <1> 	jnc	short sysrename_1
  8925 0000F5BC 21C0                <1> 	and	eax, eax  ; 0 -> Bad Path!  
  8926 0000F5BE 7505                <1> 	jnz	short sysrename_err
  8927                              <1> 	; eax = 0
  8928                              <1> sysrename_path_not_found:
  8929 0000F5C0 B813000000          <1> 	mov	eax, ERR_INV_PATH_NAME ; 'Bad path name !'
  8930                              <1> sysrename_err:
  8931 0000F5C5 59                  <1> 	pop	ecx ; new file name address (in user space)
  8932                              <1> sysrename_error:
  8933 0000F5C6 A3[64030300]        <1> 	mov	[u.r0], eax
  8934 0000F5CB A3[C8030300]        <1> 	mov	[u.error], eax
  8935 0000F5D0 E87F070000          <1> 	call 	reset_working_path
  8936 0000F5D5 E968D1FFFF          <1> 	jmp	error
  8937                              <1> sysrename_1:
  8938 0000F5DA B008                <1> 	mov	al, 08h ; Except volume labels (& long names)
  8939 0000F5DC A0[3C630100]        <1> 	mov	al, [Attributes]
  8940 0000F5E1 2410                <1> 	and	al, 10h ;
  8941                              <1> 	;mov	esi, FindFile_Name
  8942                              <1> 	;mov	ax, 1800h ; Only files
  8943                              <1> 	;mov	ax, 0810h ; Only directories
  8944 0000F5E3 66B80008            <1> 	mov	ax, 0800h ; Find File or Directory
  8945 0000F5E7 E8FB8CFFFF          <1> 	call	find_first_file
  8946                              <1> 	;jnc	short sysrename_2
  8947 0000F5EC 72D7                <1> 	jc	short sysrename_err
  8948                              <1> sysrename_2:
  8949                              <1> 	; ESI = Directory Entry (FindFile_DirEntry) Location
  8950                              <1> 	; EDI = Directory Buffer Directory Entry Location
  8951                              <1> 	; EAX = File Size
  8952                              <1> 	;  BL = Attributes of The File/Directory
  8953                              <1> 	;  BH = Long Name Yes/No Status (>0 is YES)
  8954                              <1> 	;  DX > 0 : Ambiguous filename chars are used
  8955                              <1> 
  8956 0000F5EE 6621D2              <1> 	and	dx, dx ; Ambiguous filename chars used sign (DX>0)
  8957 0000F5F1 7407                <1> 	jz	short sysrename_3
  8958 0000F5F3 B81A000000          <1> 	mov	eax, ERR_INV_FILE_NAME ; 'invalid file name !'
  8959 0000F5F8 EBCB                <1>         jmp	short sysrename_err
  8960                              <1> sysrename_3:
  8961                              <1> 	; EDI = Directory buffer entry offset/address
  8962                              <1> 	; BL = File (or Directory) Attributes 
  8963                              <1> 	; mov	bl, [EDI+0Bh]
  8964                              <1> 
  8965 0000F5FA 5A                  <1> 	pop	edx ; new file name address (in user space)
  8966                              <1> 
  8967                              <1> 	; check file/directory attributes
  8968 0000F5FB F6C307              <1> 	test	bl, 7 ; system, hidden, readonly 
  8969 0000F5FE 759E                <1>         jnz	short sysrename_perm_err
  8970                              <1> sysrename_4:
  8971 0000F600 66817F0CA101        <1> 	cmp	word [edi+DirEntry_NTRes], 01A1h ; Singlix FS
  8972 0000F606 7496                <1> 	je	short sysrename_perm_err ; -temporary!-
  8973                              <1> 
  8974                              <1> 	; save old file name & file info (FFF structure)
  8975 0000F608 BE[26620100]        <1> 	mov	esi, FindFile_Drv
  8976 0000F60D BF[6C630100]        <1> 	mov	edi, SourceFile_Drv
  8977 0000F612 B920000000          <1> 	mov	ecx, 128/4
  8978 0000F617 F3A5                <1> 	rep	movsd
  8979                              <1> 
  8980 0000F619 89D6                <1> 	mov	esi, edx ; new file name address (in user space)
  8981 0000F61B BF[EC630100]        <1> 	mov	edi, DestinationFile_Drv
  8982 0000F620 E893AEFFFF          <1> 	call	parse_path_name
  8983 0000F625 729F                <1> 	jc	short sysrename_error ; eax = 1 (Bad file name)
  8984                              <1> 
  8985                              <1> 	; same drive ? 
  8986 0000F627 A0[26620100]        <1> 	mov	al, [FindFile_Drv]
  8987 0000F62C 3A05[EC630100]      <1> 	cmp	al, [DestinationFile_Drv]
  8988                              <1> 	;jne	short sysrename_perm_err ; Permission denied
  8989 0000F632 7509                <1> 	jne	short sysrename_5 ; Bad file name
  8990                              <1>  
  8991                              <1> 	; no path name !? (rename file in same directory)
  8992 0000F634 803D[ED630100]20    <1> 	cmp	byte [DestinationFile_Directory], 20h
  8993 0000F63B 7607                <1> 	jna	short sysrename_6
  8994                              <1> sysrename_5:
  8995 0000F63D B801000000          <1> 	mov	eax, ERR_BAD_CMD_ARG ; 1 = Bad file name 
  8996                              <1> 				     ; (Bad argument)
  8997 0000F642 EB82                <1> 	jmp	short sysrename_error
  8998                              <1> sysrename_6:
  8999 0000F644 803D[2E640100]20    <1> 	cmp	byte [DestinationFile_Name], 20h
  9000 0000F64B 76F0                <1> 	jna	short sysrename_5
  9001                              <1> 
  9002 0000F64D BE[2E640100]        <1> 	mov	esi, DestinationFile_Name
  9003 0000F652 E84E90FFFF          <1> 	call	check_filename ; is it a valid msdos file name?
  9004 0000F657 0F8269FFFFFF        <1> 	jc	sysrename_error ; 26 = ERR_INV_FILE_NAME 
  9005                              <1> 	
  9006                              <1> 	;mov	esi, DestinationFile_Name
  9007 0000F65D 66B80008            <1> 	mov	ax, 0800h ; Find File or Directory
  9008 0000F661 E8818CFFFF          <1> 	call	find_first_file
  9009 0000F666 720A                <1> 	jc	short sysrename_7
  9010                              <1> 	
  9011 0000F668 B80E000000          <1> 	mov	eax, ERR_FILE_EXISTS  ; file already exists !
  9012 0000F66D E954FFFFFF          <1> 	jmp	sysrename_error	
  9013                              <1> sysrename_7:
  9014                              <1> 	; eax = 2 (File not found !)
  9015 0000F672 3C02                <1> 	cmp	al, 2 ; ERR_NOT_FOUND
  9016 0000F674 0F854CFFFFFF        <1> 	jne	sysrename_error
  9017                              <1> 
  9018                              <1> 	; 31/12/2017
  9019                              <1> 	; Following code is also part of 'rename_file' in
  9020                              <1> 	; 'trdosk3.s' (MainProg's 'rename' command) ; 13/11/2017
  9021 0000F67A BE[2E640100]        <1> 	mov	esi, DestinationFile_Name ; (Rename_NewName)
  9022 0000F67F 668B0D[E6630100]    <1> 	mov	cx, [SourceFile_DirEntryNumber] 
  9023 0000F686 66A1[D2630100]      <1> 	mov	ax, [SourceFile_DirEntry+20] ; First Cluster, HW 
  9024 0000F68C C1E010              <1> 	shl	eax, 16
  9025 0000F68F 66A1[D8630100]      <1> 	mov	ax, [SourceFile_DirEntry+26] ; First Cluster, LW 
  9026 0000F695 0FB61D[BB630100]    <1>   	movzx	ebx, byte [SourceFile_LongNameEntryLength]  
  9027 0000F69C E85FB6FFFF          <1>    	call	rename_directory_entry
  9028 0000F6A1 0F821FFFFFFF        <1> 	jc	sysrename_error
  9029                              <1> 	;xor	eax, eax
  9030 0000F6A7 A3[64030300]        <1> 	mov	[u.r0], eax ; 0
  9031                              <1> 	;mov	[u.error], eax
  9032 0000F6AC E8A3060000          <1> 	call 	reset_working_path
  9033 0000F6B1 E9ACD0FFFF          <1> 	jmp	sysret
  9034                              <1> 
  9035                              <1> sysmem: ; Get Total&Free Memory amount 
  9036                              <1> 	; 31/12/2017 (TRDOS 386 = TRDOS v2.0) 
  9037                              <1> 	;	
  9038                              <1>         ; INPUT -> 
  9039                              <1> 	;	none	
  9040                              <1> 	; OUTPUT ->
  9041                              <1> 	;	EAX = Total memory count (in bytes)
  9042                              <1> 	;	EBX = Virtually available memory amount (in bytes)
  9043                              <1> 	;	      = 4GB - CORE (4MB)	
  9044                              <1> 	;	ECX = Free memory count (in bytes)
  9045                              <1> 	;	EDX = Calculated free memory count (in bytes)
  9046                              <1> 	
  9047 0000F6B6 A1[C4580100]        <1> 	mov	eax, [memory_size] ; in pages
  9048 0000F6BB C1E00C              <1> 	shl	eax, 12		   ; in bytes
  9049 0000F6BE A3[64030300]        <1> 	mov	[u.r0], eax
  9050 0000F6C3 E8893CFFFF          <1> 	call	calc_free_mem
  9051                              <1> 	; edx = calculated free pages
  9052                              <1> 	; ecx = 0
  9053 0000F6C8 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; EBP points to user's registers
  9054 0000F6CE C745100000C0FF      <1> 	mov	dword [ebp+16], ECORE ; EBX (for user)
  9055                              <1> 				; 0FFC00000h ; 4GB - 4MB
  9056 0000F6D5 C1E20C              <1> 	shl	edx, 12
  9057 0000F6D8 895514              <1> 	mov	[ebp+20], edx ; EDX (for user)
  9058 0000F6DB 8B0D[C8580100]      <1> 	mov 	ecx, [free_pages]
  9059 0000F6E1 C1E10C              <1> 	shl	ecx, 12	; free bytes
  9060 0000F6E4 894D18              <1> 	mov	[ebp+24], ecx ; ECX (for user)
  9061                              <1> 	;mov	[free_pages], edx	
  9062 0000F6E7 E976D0FFFF          <1> 	jmp	sysret
  9063                              <1> 
  9064                              <1> sysprompt:
  9065                              <1> 	; Set TRDOS 386 Command Interpreter (MainProg) prompt 
  9066                              <1> 	; 31/12/2017 (TRDOS 386 = TRDOS v2.0) 
  9067                              <1> 	;	
  9068                              <1>         ; INPUT -> 
  9069                              <1> 	;	EBX = 0 -> use default prompt
  9070                              <1> 	;	EBX > 0 -> prompt string (ASCIIZ) address
  9071                              <1> 	;		  (Max. 11 characters except ZERO tail)	
  9072                              <1> 	; OUTPUT ->
  9073                              <1> 	;	(EAX = 0)
  9074                              <1> 	;	CF = 0 -> Successful
  9075                              <1> 	;	CF = 1 -> Failed
  9076                              <1> 
  9077 0000F6EC 21DB                <1> 	and	ebx, ebx
  9078 0000F6EE 750A                <1> 	jnz	short sysprompt_0
  9079                              <1> 
  9080 0000F6F0 E8F685FFFF          <1> 	call	default_command_prompt ; '['+'TRDOS'+']'
  9081 0000F6F5 E968D0FFFF          <1> 	jmp	sysret
  9082                              <1> 
  9083                              <1> sysprompt_0:
  9084 0000F6FA 31C0                <1> 	xor	eax, eax
  9085 0000F6FC A3[64030300]        <1> 	mov	[u.r0], eax 
  9086 0000F701 89DE                <1> 	mov	esi, ebx
  9087 0000F703 B90C000000          <1> 	mov	ecx, 12
  9088 0000F708 89E5                <1> 	mov	ebp, esp
  9089 0000F70A 29CC                <1> 	sub	esp, ecx
  9090 0000F70C 49                  <1> 	dec	ecx ; 11
  9091 0000F70D 89E7                <1> 	mov	edi, esp
  9092 0000F70F E833F1FFFF          <1> 	call	transfer_from_user_buffer
  9093 0000F714 7211                <1> 	jc	short sysprompt_err
  9094 0000F716 803E20              <1> 	cmp	byte [esi], 20h
  9095 0000F719 760C                <1> 	jna	short sysprompt_err
  9096 0000F71B E8DD85FFFF          <1> 	call	set_command_prompt
  9097 0000F720 89EC                <1> 	mov	esp, ebp
  9098 0000F722 E93BD0FFFF          <1> 	jmp	sysret
  9099                              <1> sysprompt_err:
  9100                              <1> syspath_err:
  9101 0000F727 89EC                <1> 	mov	esp, ebp
  9102 0000F729 E914D0FFFF          <1> 	jmp	error
  9103                              <1> 
  9104                              <1> syspath:
  9105                              <1> 	; Get/Set Run Path
  9106                              <1> 	; 31/12/2017 (TRDOS 386 = TRDOS v2.0) 
  9107                              <1> 	;	
  9108                              <1>         ; INPUT -> 
  9109                              <1> 	;	EBX = 0 -> get path (to buffer address in ECX)
  9110                              <1> 	;	EBX > 0 -> set path
  9111                              <1> 	;	    EBX = Path string buffer address (ASCIIZ)
  9112                              <1> 	;	    	  (Path description except 'PATH=')
  9113                              <1> 	;	ECX = Buffer address (if EBX = 0)
  9114                              <1> 	;	      (ECX will not be used if EBX > 0)	
  9115                              <1> 	;	DL = Buffer size (0 = 256 byte)	
  9116                              <1> 	;
  9117                              <1> 	; OUTPUT ->
  9118                              <1> 	;	CF = 0 -> Successful (EAX = String length)
  9119                              <1> 	;	CF = 1 -> Failed (EAX = 0)
  9120                              <1> 	;
  9121                              <1> 	; NOTE: 'PATH=' or 'PATH' must be excluded
  9122                              <1> 	;  (It must not be at the beginning of the string.)
  9123                              <1> 
  9124 0000F72E 89E5                <1> 	mov	ebp, esp
  9125 0000F730 81EC00010000        <1> 	sub	esp, 256
  9126 0000F736 89E7                <1> 	mov	edi, esp
  9127                              <1> 
  9128 0000F738 31C0                <1> 	xor	eax, eax
  9129 0000F73A A3[64030300]        <1> 	mov	[u.r0], eax 
  9130                              <1> 	
  9131 0000F73F 21DB                <1> 	and	ebx, ebx
  9132 0000F741 752E                <1> 	jnz	short syspath_0
  9133                              <1> 
  9134                              <1> 	; EBX = 0 -> get run path
  9135 0000F743 89CB                <1> 	mov	ebx, ecx ; buffer addr (in user's mem space)
  9136 0000F745 BE[2E0E0100]        <1> 	mov	esi, Cmd_Path  ; 'PATH' address
  9137 0000F74A 0FB6CA              <1> 	movzx	ecx, dl
  9138 0000F74D 80E901              <1> 	sub	cl, 1 ; 0 -> 255, 1 -> 0
  9139 0000F750 6683D101            <1> 	adc	cx, 1 ; 255 -> 256, 0 -> 1
  9140                              <1> 	; EDI = Output buffer 
  9141                              <1> 	; CX = Buffer length
  9142                              <1> 	; AL = 0 -> use ASCIIZ word in [ESI]
  9143                              <1> 	; ESI = 'PATH' address (with zero tail)
  9144 0000F754 E8D89DFFFF          <1> 	call	get_environment_string
  9145 0000F759 72CC                <1> 	jc	short syspath_err
  9146 0000F75B 89DF                <1> 	mov	edi, ebx ; User's buffer address
  9147 0000F75D 89E6                <1> 	mov	esi, esp 
  9148                              <1> 	; EDI = User's buffer address
  9149                              <1> 	; ECX = transfer (byte) count
  9150 0000F75F E899F0FFFF          <1> 	call	transfer_to_user_buffer
  9151 0000F764 72C1                <1> 	jc	short syspath_err
  9152 0000F766 890D[64030300]      <1> 	mov	[u.r0], ecx 
  9153 0000F76C E9F1CFFFFF          <1> 	jmp	sysret
  9154                              <1> 
  9155                              <1> syspath_0:
  9156 0000F771 89DE                <1> 	mov	esi, ebx
  9157 0000F773 0FB6CA              <1> 	movzx	ecx, dl
  9158 0000F776 80E901              <1> 	sub	cl, 1 ; 0 -> 255, 1 -> 0
  9159 0000F779 6683D101            <1> 	adc	cx, 1 ; 255 -> 256, 0 -> 1
  9160 0000F77D E8C5F0FFFF          <1> 	call	transfer_from_user_buffer
  9161 0000F782 72A3                <1> 	jc	short syspath_err
  9162                              <1> 	;(*) 'PATH=' will be added to 
  9163                              <1> 	;         the head of the string
  9164 0000F784 83EC08              <1> 	sub	esp, 8 ;(*)
  9165 0000F787 89FE                <1> 	mov	esi, edi ;(*)
  9166 0000F789 E8879DFFFF          <1> 	call	set_path_x ;(*)
  9167 0000F78E 7297                <1> 	jc	short syspath_err
  9168 0000F790 8915[64030300]      <1> 	mov	[u.r0], edx ; run path string length
  9169 0000F796 E9C7CFFFFF          <1> 	jmp	sysret	
  9170                              <1> 
  9171                              <1> sysenv:
  9172                              <1> 	; Get/Set Environment Variables
  9173                              <1> 	; 31/12/2017 (TRDOS 386 = TRDOS v2.0) 
  9174                              <1> 	;	
  9175                              <1>         ; INPUT -> 
  9176                              <1> 	;	EBX = 0 -> get (all) environment variables
  9177                              <1> 	;	      (Required Buffer length = 512 bytes)
  9178                              <1> 	;	EBX > 0 -> set (one) environment variable
  9179                              <1> 	;	      (If there is not a '=' after
  9180                              <1> 	;	      the environment variable name, it will
  9181                              <1> 	;	      accepted as 'get environment variable'.) 
  9182                              <1> 	;	       EBX = Buffer address
  9183                              <1> 	;	ECX = Buffer address (if EBX = 0)
  9184                              <1> 	;	      (ECX will not be used if EBX > 0)	
  9185                              <1> 	;	      (Note: Buffer size is 512 bytes.)	
  9186                              <1> 	;	DL = Buffer size (0 = 256 byte)
  9187                              <1> 	;	     (For one envrionment variable)		
  9188                              <1> 	;
  9189                              <1> 	; OUTPUT ->
  9190                              <1> 	;	(EAX = 0)
  9191                              <1> 	;	CF = 0 -> Successful (EAX = String length)
  9192                              <1> 	;	CF = 1 -> Failed (EAX = 0)
  9193                              <1> 	;
  9194                              <1> 	; Note: Environment variable name, for example,
  9195                              <1> 	;	'PATH=' must be included at the beginning
  9196                              <1> 	;	of the environment string. If the variable
  9197                              <1> 	;	name is as 'PATH' but it is not as 'PATH='
  9198                              <1> 	;	the variable string (row) will be returned.
  9199                              <1> 	;	If variable name is as 'PATH=' but there is
  9200                              <1> 	;	not a following text after the variable name,
  9201                              <1> 	;	the environment variable will be reset/deleted.
  9202                              <1> 
  9203 0000F79B 89E5                <1> 	mov	ebp, esp
  9204 0000F79D 81EC00020000        <1> 	sub	esp, 512
  9205 0000F7A3 89E7                <1> 	mov	edi, esp
  9206                              <1> 
  9207 0000F7A5 31C0                <1> 	xor	eax, eax
  9208 0000F7A7 A3[64030300]        <1> 	mov	[u.r0], eax 
  9209                              <1> 	
  9210 0000F7AC 21DB                <1> 	and	ebx, ebx
  9211 0000F7AE 7524                <1> 	jnz	short sysenv_0
  9212                              <1> 
  9213                              <1> 	; EBX = 0 -> get (all) environment variables
  9214 0000F7B0 89EC                <1> 	mov	esp, ebp
  9215 0000F7B2 BE00300900          <1> 	mov	esi, Env_Page  ; Environment page
  9216 0000F7B7 89CF                <1> 	mov	edi, ecx ; buffer addr (in user's mem space)
  9217 0000F7B9 B900020000          <1> 	mov	ecx, 512
  9218 0000F7BE E83AF0FFFF          <1> 	call	transfer_to_user_buffer
  9219 0000F7C3 0F8279CFFFFF        <1> 	jc	error
  9220 0000F7C9 890D[64030300]      <1> 	mov	[u.r0], ecx 
  9221 0000F7CF E98ECFFFFF          <1> 	jmp	sysret
  9222                              <1> 
  9223                              <1> sysenv_0:
  9224 0000F7D4 89DE                <1> 	mov	esi, ebx ; * ; user's buffer address
  9225 0000F7D6 0FB6CA              <1> 	movzx	ecx, dl
  9226 0000F7D9 80E901              <1> 	sub	cl, 1 ; 0 -> 255, 1 -> 0
  9227 0000F7DC 6683D101            <1> 	adc	cx, 1 ; 255 -> 256, 0 -> 1
  9228 0000F7E0 E862F0FFFF          <1> 	call	transfer_from_user_buffer
  9229 0000F7E5 723F                <1> 	jc	short sysenv_err
  9230 0000F7E7 89FE                <1> 	mov	esi, edi
  9231 0000F7E9 8A06                <1> 	mov	al, [esi]
  9232 0000F7EB 3C20                <1> 	cmp	al, 20h
  9233 0000F7ED 7637                <1> 	jna	short sysenv_err
  9234 0000F7EF 3C3D                <1> 	cmp	al, '='
  9235 0000F7F1 7433                <1> 	je	short sysenv_err
  9236 0000F7F3 56                  <1> 	push	esi
  9237                              <1> sysenv_1:
  9238 0000F7F4 46                  <1> 	inc	esi
  9239 0000F7F5 803E3D              <1> 	cmp	byte [esi], '='
  9240 0000F7F8 7433                <1> 	je	short sysenv_3
  9241 0000F7FA 803E20              <1> 	cmp	byte [esi], 20h
  9242 0000F7FD 73F5                <1> 	jnb	short sysenv_1
  9243 0000F7FF C60600              <1> 	mov	byte [esi], 0 
  9244 0000F802 5E                  <1> 	pop	esi
  9245                              <1> 	; EDI = Output buffer 
  9246                              <1> 	; CX = Buffer length
  9247 0000F803 30C0                <1> 	xor	al, al
  9248                              <1> 	; AL = 0 -> use ASCIIZ word in [ESI]
  9249                              <1> 	; ESI = Environment variable name address
  9250 0000F805 E8279DFFFF          <1> 	call	get_environment_string
  9251 0000F80A 721A                <1> 	jc	short sysenv_err
  9252 0000F80C 89DF                <1> 	mov	edi, ebx ; * ; user's buffer address
  9253 0000F80E 89C1                <1> 	mov	ecx, eax ; String length
  9254 0000F810 89E6                <1> 	mov	esi, esp 
  9255                              <1> 	; ESI = system buffer address
  9256                              <1> 	; EDI = User's buffer address
  9257                              <1> 	; ECX = transfer (byte) count
  9258 0000F812 E8E6EFFFFF          <1> 	call	transfer_to_user_buffer
  9259 0000F817 720D                <1> 	jc	short sysenv_err
  9260 0000F819 890D[64030300]      <1> 	mov	[u.r0], ecx ; transfer (byte) count
  9261                              <1> sysenv_2:
  9262 0000F81F 89EC                <1> 	mov	esp, ebp
  9263 0000F821 E93CCFFFFF          <1> 	jmp	sysret
  9264                              <1> sysenv_err:
  9265 0000F826 89EC                <1> 	mov	esp, ebp
  9266 0000F828 E915CFFFFF          <1> 	jmp	error
  9267                              <1> sysenv_3:
  9268 0000F82D 46                  <1> 	inc	esi
  9269 0000F82E 803E20              <1> 	cmp	byte [esi], 20h
  9270 0000F831 73FA                <1> 	jnb	short sysenv_3
  9271 0000F833 C60600              <1> 	mov	byte [esi], 0	
  9272 0000F836 5E                  <1> 	pop	esi
  9273 0000F837 E8B89DFFFF          <1> 	call	set_environment_string
  9274 0000F83C 72E8                <1> 	jc	short sysenv_err
  9275 0000F83E 8915[64030300]      <1> 	mov	[u.r0], edx
  9276 0000F844 EBD9                <1> 	jmp	short sysenv_2
  9277                              <1> 
  9278                              <1> 
  9279                              <1> ; temporary - 24/01/2016
  9280                              <1> 
  9281                              <1> iget:
  9282 0000F846 C3                  <1> 	retn
  9283                              <1> isintr:
  9284 0000F847 C3                  <1> 	retn
  9285                              <1> iopen:
  9286 0000F848 C3                  <1> 	retn
  9287                              <1> iclose:
  9288 0000F849 C3                  <1> 	retn
  9289                              <1> sndc:
  9290 0000F84A C3                  <1> 	retn
  9291                              <1> access:
  9292 0000F84B C3                  <1> 	retn
  9293                              <1> sleep:
  9294 0000F84C C3                  <1> 	retn
  2311                                  %include 'trdosk7.s' ; 24/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - DISK READ&WRITE : trdosk7.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 25/02/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; DISK_IO.ASM (20/07/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; DISK_IO.ASM (c) 2009-2011 Erdogan TAN [ 04/07/2009 ] Last Update: 20/07/2011
    14                              <1> 
    15                              <1> disk_write:
    16                              <1> 	; 25/02/2016
    17                              <1> 	; 24/02/2016
    18                              <1> 	; 23/02/2016
    19 0000F84D 807E0500            <1> 	cmp	byte [esi+LD_LBAYes], 0
    20 0000F851 777B                <1>         ja      short lba_write
    21                              <1> 
    22                              <1> chs_write:
    23                              <1> 	; 25/02/2016
    24                              <1> 	; 23/02/2016
    25 0000F853 C605[75610100]03    <1> 	mov	byte [disk_rw_op], 3 ; CHS write
    26 0000F85A EB0D                <1> 	jmp	short chs_rw
    27                              <1> 
    28                              <1> disk_read:
    29                              <1> 	; 25/02/2016
    30                              <1> 	; 24/02/2016
    31                              <1> 	; 23/02/2016
    32                              <1> 	; 17/02/2016
    33                              <1> 	; 14/02/2016
    34                              <1> 	; 31/01/2016 (TRDOS 386 =  TRDOS v2.0)
    35                              <1> 	; 17/10/2010
    36                              <1> 	; 18/04/2010
    37                              <1> 	;
    38                              <1> 	; INPUT -> EAX = Logical Block Address
    39                              <1> 	;	   ESI = Logical Dos Disk Table Offset (DRV)	
    40                              <1> 	;	   ECX = Sector Count	
    41                              <1> 	; 	   EBX = Destination Buffer
    42                              <1> 	; OUTPUT -> 
    43                              <1> 	;	   cf = 0 or cf = 1
    44                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX)
    45                              <1> 
    46 0000F85C 807E0500            <1> 	cmp	byte [esi+LD_LBAYes], 0
    47 0000F860 7775                <1>         ja      short lba_read
    48                              <1> 
    49                              <1> chs_read:
    50                              <1> 	; 25/02/2016
    51                              <1> 	; 24/02/2016
    52                              <1> 	; 23/02/2016
    53                              <1> 	; 31/01/2016 (TRDOS 386 =  TRDOS v2.0)
    54                              <1> 	; 20/07/2011
    55                              <1> 	; 04/07/2009
    56                              <1> 	;
    57                              <1> 	; INPUT -> EAX = Logical Block Address
    58                              <1> 	;	   ECX = Number of sectors to read
    59                              <1> 	; 	   ESI = Logical Dos Disk Table Offset (DRV)
    60                              <1> 	; 	   EBX = Destination Buffer
    61                              <1> 	; OUTPUT -> 
    62                              <1> 	;	   cf = 0 or cf = 1
    63                              <1> 	; (Modified registers: EAX; EBX, ECX, EDX)
    64                              <1> 
    65                              <1> 	; 23/02/2016
    66 0000F862 C605[75610100]02    <1> 	mov	byte [disk_rw_op], 2 ; CHS read
    67                              <1> 
    68                              <1> chs_rw:
    69                              <1> 	;;movzx	edx, word [esi+LD_BPB+SecPerTrack]
    70                              <1> 	;movzx	edx, byte [esi+LD_BPB+SecPerTrack] ; <= 63
    71                              <1> 	;mov	[disk_rw_spt], dl
    72                              <1> 
    73                              <1> chs_read_next_sector:
    74 0000F869 C605[76610100]04    <1> 	mov	byte [retry_count], 4
    75                              <1>      
    76                              <1> chs_read_retry:
    77                              <1> 	;mov	[sector_count], ecx ; 23/02/2016
    78                              <1> 
    79 0000F870 50                  <1> 	push	eax			; Linear sector #
    80 0000F871 51                  <1> 	push	ecx			; # of FAT/FILE/DIR sectors
    81                              <1>                 
    82 0000F872 0FB74E1E            <1> 	movzx	ecx, word [esi+LD_BPB+SecPerTrack]
    83                              <1> 	;movzx	ecx, byte [disk_rw_spt] ; 23/02/2016
    84 0000F876 29D2                <1> 	sub	edx, edx
    85 0000F878 F7F1                <1> 	div	ecx
    86                              <1> 	; eax = track, dx (dl ) = sector (on track)
    87                              <1> 	;sub	cl, dl ; 24/02/2016 (spt - sec)
    88                              <1> 	;push	ecx ; *
    89 0000F87A 6689D1              <1> 	mov	cx, dx			; Sector (zero based)
    90 0000F87D 6641                <1> 	inc	cx			; To make it 1 based
    91 0000F87F 6651                <1> 	push	cx
    92 0000F881 668B4E20            <1> 	mov	cx, [esi+LD_BPB+Heads]
    93 0000F885 6629D2              <1> 	sub	dx, dx
    94 0000F888 F7F1                <1> 	div	ecx			; Convert track to head & cyl
    95                              <1> 	; eax (ax) = cylinder, dx (dl) = head (max. FFh)
    96 0000F88A 88D6                <1> 	mov	dh, dl
    97 0000F88C 6659                <1> 	pop	cx			; AX=Cyl, DH=Head, CX=Sector
    98 0000F88E 8A5602              <1> 	mov	dl, [esi+LD_PhyDrvNo]
    99                              <1> 
   100 0000F891 88C5                <1> 	mov	ch, al			; NOTE: max. 1023 cylinders !                   
   101 0000F893 C0CC02              <1> 	ror	ah, 2			; Rotate 2 bits right
   102 0000F896 08E1                <1> 	or	cl, ah
   103                              <1> 
   104                              <1> 	; 24/02/2016
   105                              <1> 	;pop	eax ; * (spt - sec) (example: 63 - 0 = 63)
   106                              <1> 	;cmp	eax, [sector_count]
   107                              <1> 	;jb	short chs_write_sectors
   108                              <1> 	;je	short chs_read_sectors
   109                              <1> 	;; (# of sectors to read is more than remaining sectors on the track)
   110                              <1> 	;mov	al, [sector_count]
   111                              <1> ;chs_read_sectors: ; read or write !
   112 0000F898 B001                <1> 	mov	al, 1 ; 25/02/2016
   113 0000F89A 8A25[75610100]      <1> 	mov	ah, [disk_rw_op]  ; 02h = chs read, 03h = chs write 
   114                              <1> 	;
   115 0000F8A0 E88849FFFF          <1> 	call	int13h			; BIOS Service func ( ah ) = 2
   116                              <1>                                         ; Read disk sectors
   117                              <1>                                         ; AL-sec num CH-track CL-sec
   118                              <1>                                         ; DH-head DL-drive ES:BX-buffer
   119                              <1>                                         ; CF-flag AH-stat AL-sec read
   120                              <1> 	                                ; If CF = 1 then (If AH > 0)
   121 0000F8A5 8825[77610100]      <1> 	mov	[disk_rw_err], ah
   122                              <1> 	
   123 0000F8AB 59                  <1> 	pop	ecx
   124 0000F8AC 58                  <1> 	pop	eax
   125 0000F8AD 7314                <1> 	jnc	short chs_read_ok
   126                              <1> 
   127 0000F8AF 803D[77610100]09    <1> 	cmp	byte [disk_rw_err], 09h ; DMA crossed 64K segment boundary
   128 0000F8B6 7408                <1> 	je	short chs_read_error_retn
   129                              <1>              
   130 0000F8B8 FE0D[76610100]      <1> 	dec	byte [retry_count]
   131 0000F8BE 75B0                <1> 	jnz	short chs_read_retry
   132                              <1> 
   133                              <1> chs_read_error_retn:
   134 0000F8C0 F9                  <1> 	stc
   135                              <1> 	;retn
   136 0000F8C1 EB69                <1> 	jmp	short update_drv_error_byte
   137                              <1> 
   138                              <1> ;chs_write_sectors: ; read or write 
   139                              <1> 	;; (# of sectors to read is less than remaining sectors on the track)
   140                              <1> 	;mov	[sector_count], al
   141                              <1> 	;jmp	short chs_read_sectors
   142                              <1> 
   143                              <1> chs_read_ok:
   144                              <1> 	;; 23/02/2016
   145                              <1> 	;movzx	edx, byte [sector_count] ; sector count (<= spt)	
   146                              <1>         ;sub    ecx, edx  ; remaining sector count
   147                              <1> 	;jna	short update_drv_error_byte	
   148                              <1> 	;add	eax, edx ; next disk sector
   149                              <1> 	;shl	edx, 9 ; 512 * sector count
   150                              <1> 	;add	ebx, edx ; next buffer byte address 
   151                              <1>         ;jmp     chs_read_next_sector        
   152                              <1> 	; 25/02/2016
   153 0000F8C3 40                  <1> 	inc	eax ; next sector
   154 0000F8C4 81C300020000        <1> 	add	ebx, 512
   155 0000F8CA E29D                <1> 	loop	chs_read_next_sector
   156 0000F8CC EB5E                <1> 	jmp	short update_drv_error_byte
   157                              <1> 
   158                              <1> lba_write:
   159                              <1> 	; 23/02/2016
   160 0000F8CE C605[75610100]1C    <1> 	mov	byte [disk_rw_op], 1Ch ; LBA write
   161 0000F8D5 EB07                <1> 	jmp	short lba_rw
   162                              <1> 
   163                              <1> lba_read:
   164                              <1> 	; 23/02/2016
   165                              <1> 	; 17/02/2016
   166                              <1> 	; 14/02/2016
   167                              <1> 	; 13/02/2016
   168                              <1> 	; 31/01/2016 (TRDOS 386 =  TRDOS v2.0)
   169                              <1> 	; 10/07/2015 (Retro UNIX 386 v1)
   170                              <1> 	;
   171                              <1> 	; INPUT -> EAX = Logical Block Address
   172                              <1> 	;	   ESI = Logical Dos Disk Table Offset (DRV)	
   173                              <1> 	;	   ECX = Sector Count	
   174                              <1> 	; 	   EBX = Destination Buffer
   175                              <1> 	; OUTPUT -> 
   176                              <1> 	;	   cf = 0 or cf = 1
   177                              <1> 	; (Modified registers: EAX, EBX, ECX, EDX)
   178                              <1> 
   179                              <1> 	; LBA read/write (with private LBA function) 
   180                              <1> 	;((Retro UNIX 386 v1 - DISK I/O code by Erdogan Tan))
   181                              <1> 
   182                              <1> 
   183                              <1> 	; 23/02/2016
   184 0000F8D7 C605[75610100]1B    <1> 	mov	byte [disk_rw_op], 1Bh ; LBA read
   185                              <1> 
   186                              <1> lba_rw:
   187                              <1> 	; 17/02/2016
   188 0000F8DE 57                  <1> 	push	edi
   189                              <1> 
   190 0000F8DF 890D[78610100]      <1> 	mov	[sector_count], ecx ; total sector (read) count
   191                              <1> 
   192 0000F8E5 8A5602              <1> 	mov	dl, [esi+LD_PhyDrvNo]
   193                              <1> 	; dl = physical drive number (0,1, 80h, 81h, 82h, 83h)
   194                              <1> 
   195                              <1> lba_read_next:
   196 0000F8E8 81F900010000        <1> 	cmp	ecx, 256
   197 0000F8EE 7605                <1> 	jna	short lba_read_rsc
   198 0000F8F0 B900010000          <1> 	mov	ecx, 256 ; 17/02/2016
   199                              <1> lba_read_rsc:
   200 0000F8F5 290D[78610100]      <1> 	sub	[sector_count], ecx ; remain sectors
   201                              <1> 
   202 0000F8FB 89CF                <1> 	mov	edi, ecx 
   203 0000F8FD 89C1                <1> 	mov	ecx, eax ; sector number/address
   204                              <1> 
   205 0000F8FF C605[76610100]04    <1> 	mov	byte [retry_count], 4
   206                              <1> lba_read_retry:
   207 0000F906 89F8                <1> 	mov	eax, edi
   208                              <1> 	;
   209                              <1> 	; ecx = sector number
   210                              <1> 	; al = sector count (0 - 255) /// (0 = 256)
   211                              <1> 	; dl = drive number
   212                              <1> 	; ebx = buffer offset
   213                              <1> 	;
   214                              <1> 	; Function 1Bh = LBA read, 1Ch = LBA write
   215                              <1> 	; 23/02/2016
   216 0000F908 8A25[75610100]      <1> 	mov	ah, [disk_rw_op] ; 1Bh = LBA read, 1Ch = LBA write
   217 0000F90E E81A49FFFF          <1> 	call	int13h
   218                              <1> 	; al = ? (changed)
   219                              <1> 	; ah = error code
   220 0000F913 8825[77610100]      <1> 	mov	[disk_rw_err], ah
   221 0000F919 7334                <1> 	jnc	short lba_read_ok
   222 0000F91B 80FC80              <1> 	cmp	ah, 80h ; time out?
   223 0000F91E 740A                <1>         je      short lba_read_stc_retn
   224 0000F920 FE0D[76610100]      <1> 	dec	byte [retry_count]
   225 0000F926 7FDE                <1> 	jg	short lba_read_retry
   226 0000F928 743A                <1> 	jz	short lba_read_reset
   227                              <1> 	; sf =  1
   228                              <1> 
   229                              <1> lba_read_stc_retn:
   230 0000F92A F9                  <1> 	stc
   231                              <1> lba_read_retn:
   232 0000F92B 5F                  <1> 	pop	edi
   233                              <1> 
   234                              <1> update_drv_error_byte:
   235 0000F92C 9C                  <1> 	pushf
   236 0000F92D 53                  <1> 	push	ebx
   237 0000F92E 6651                <1> 	push	cx
   238                              <1> 	;or	ecx, ecx
   239                              <1> 	;jz	short udrv_errb0
   240 0000F930 8A0D[77610100]      <1> 	mov	cl, [disk_rw_err]
   241                              <1> udrv_errb0:
   242 0000F936 0FB65E02            <1> 	movzx	ebx, byte [esi+LD_PhyDrvNo]
   243 0000F93A 80FB02              <1> 	cmp	bl, 2
   244 0000F93D 7203                <1>         jb      short udrv_errb1
   245 0000F93F 80EB7E              <1> 	sub	bl, 7Eh
   246                              <1> 	;cmp	bl, 5
   247                              <1> 	;ja	short udrv_errb2	
   248                              <1> udrv_errb1:
   249 0000F942 81C3[A95D0000]      <1>         add     ebx, drv.error ; 13/02/2016
   250 0000F948 880B                <1> 	mov	[ebx], cl ; error code
   251                              <1> udrv_errb2:
   252 0000F94A 6659                <1> 	pop	cx
   253 0000F94C 5B                  <1> 	pop	ebx
   254 0000F94D 9D                  <1> 	popf
   255 0000F94E C3                  <1> 	retn
   256                              <1> 
   257                              <1> lba_read_ok:
   258 0000F94F 89C8                <1> 	mov	eax, ecx ; sector number
   259 0000F951 01F8                <1> 	add	eax, edi ; sector number (next)
   260 0000F953 C1E709              <1> 	shl	edi, 9 ; sector count * 512
   261 0000F956 01FB                <1> 	add	ebx, edi ; next buffer offset
   262                              <1> 
   263 0000F958 8B0D[78610100]      <1> 	mov	ecx, [sector_count] ; remaining sectors
   264 0000F95E 09C9                <1> 	or	ecx, ecx
   265 0000F960 7586                <1> 	jnz	short lba_read_next
   266 0000F962 EBC7                <1> 	jmp	short lba_read_retn
   267                              <1> 
   268                              <1> lba_read_reset:
   269 0000F964 B40D                <1> 	mov	ah, 0Dh ; Alternate reset
   270 0000F966 E8C248FFFF          <1>         call	int13h
   271                              <1> 	; al = ? (changed)
   272                              <1> 	; ah = error code
   273 0000F96B 7399                <1> 	jnc	short lba_read_retry
   274 0000F96D EBBC                <1> 	jmp	short lba_read_retn
  2312                                  %include 'trdosk8.s' ; 24/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.2) - MAIN PROGRAM : trdosk8.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 03/08/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    11                              <1> ; u0.s (20/11/2015), u4.s (14/10/2015)
    12                              <1> ; ****************************************************************************
    13                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    14                              <1> ; TRDOS2.ASM (09/11/2011)
    15                              <1> ; ----------------------------------------------------------------------------
    16                              <1> ; DIR.ASM (c) 2004-2011 Erdogan TAN  [07/01/2004] Last Update: 09/10/2011
    17                              <1> 
    18                              <1> set_run_sequence:
    19                              <1> 	; 23/12/2016
    20                              <1> 	; 10/06/2016
    21                              <1> 	; 22/05/2016
    22                              <1> 	; 20/05/2016
    23                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
    24                              <1> 	; TRDOS 386 feature only !
    25                              <1> 	;
    26                              <1> 	; INPUT ->
    27                              <1> 	;	AL = process number (next process)
    28                              <1> 	;
    29                              <1> 	;	this process must be added to run sequence
    30                              <1> 	;
    31                              <1> 	;	[u.pri] = priority of present process
    32                              <1> 	;
    33                              <1> 	;	DL = priority (queue)
    34                              <1> 	;	     0 = background (low) ; run on background 
    35                              <1> 	;	     1 = regular (normal) ; run as regular
    36                              <1> 	;	     2 = event (high)     ; run for event
    37                              <1> 	;
    38                              <1> 	;	1) If the requested process is already running:
    39                              <1> 	;	   a) If present priority is high ([u.pri]=2) 
    40                              <1> 	;	      and requested priority is also high, 
    41                              <1> 	;	      there is nothing to do! Because it has been
    42                              <1> 	;	      done already (before this attempt).		 	
    43                              <1> 	;	   b) If present priority is high ([u.pri]=2)
    44                              <1> 	;	      and requested priority is not high, there is
    45                              <1> 	;	      nothing to do! Because, it's current
    46                              <1> 	;	      run queue is unspecified, here. (It may be in
    47                              <1> 	;	      a waiting list or in a run queue; if the new
    48                              <1> 	;	      priority would be used to add it to relavant
    49                              <1>         ;             run queue, this would be wrong, unnecessary
    50                              <1> 	;	      and destabilizing duplication!)
    51                              <1> 	;	   c) If present priority is not high ([u.pri]<2)
    52                              <1>         ;             and requested priority is high (event),
    53                              <1> 	;	      process will be added to present priority's
    54                              <1> 	;	      run queue and then, priority will be changed
    55                              <1> 	;	      to high ([u.pri]=2).
    56                              <1> 	;	   d) If present priority is not high ([u.pri]<2)
    57                              <1> 	;	      and requested priority is not high, [u.pri]
    58                              <1> 	;	      value will be changed. There is nothing to do
    59                              <1> 	;	      in addition. (The new priority value will be
    60                              <1> 	;	      used by 'tswap/tswitch' procedure at 'sysret'
    61                              <1> 	;	      or 'sysrele' stage.)
    62                              <1> 	;
    63                              <1> 	;	2) If the requested process is not running:
    64                              <1> 	;	   a) If requested priority of the requested
    65                              <1> 	;	      (next) process is high (event) and priority
    66                              <1> 	;	      of present process is not high, the requested
    67                              <1> 	;	      process will be added to ('runq_event') high
    68                              <1> 	;	      priority run queue and then present (running)
    69                              <1> 	;	      process will be stopped (swapped/switched out)
    70                              <1> 	;	      immediately if it is in user mode, or it's 
    71                              <1> 	;	      [u.quant] value will be reset to 0 and (then) 
    72                              <1> 	;	      it will be stopped at 'sysret' stage.			
    73                              <1> 	;	   b) If requested priority of the requested
    74                              <1> 	;	      (next) process is high (event) and priority
    75                              <1> 	;	      of present process is also high, the requested
    76                              <1> 	;	      process will be added to ('runq_event') high
    77                              <1> 	;	      priority run queue and present (running) 
    78                              <1> 	;	      process will be allowed to run until it's 
    79                              <1> 	;	      time quantum will be elapsed ([u.quant]=0).	
    80                              <1> 	;	   c) If requested priority of the requested
    81                              <1> 	;	      (next) process is not high ('run for event'), 
    82                              <1> 	;	      there is nothing to do. Because, it's current
    83                              <1> 	;	      run queue is unspecified, here. (It may be in
    84                              <1> 	;	      a waiting list or in a run queue; if the new
    85                              <1> 	;	      priority would be used to add it to relavant
    86                              <1>         ;             run queue, this would be wrong, unnecessary
    87                              <1> 	;	      and destabilizing duplication!) 
    88                              <1> 	;
    89                              <1> 	; OUTPUT ->
    90                              <1> 	;	none
    91                              <1> 	;
    92                              <1> 	;	[u.pri] = priority of present process
    93                              <1> 	;
    94                              <1> 	;	cf = 1, if the request could not be fulfilled.
    95                              <1> 	;			 	     	  
    96                              <1> 	;	NOTE: 
    97                              <1>         ;          * Processes in 'run as regular' queue can run
    98                              <1> 	;	     if there is no process in 'run for event' queue
    99                              <1> 	;	     ('run for event' processes have higher priority)	 		 
   100                              <1> 	;	   * When [u.quant] time quantum of a process is
   101                              <1> 	;	     elapsed, it's high priority ('run for event')
   102                              <1> 	;	     status will be disabled, it can be run in sequence
   103                              <1> 	;	     of it's actual run queue.
   104                              <1> 	;	   * A 'run on background' process will always be 
   105                              <1> 	;	     sequenced in 'run on background' (low priority)
   106                              <1> 	;	     queue, it can run only when other priority queues
   107                              <1> 	;	     are empty. (idle time processes, e.g. printing)  	 	
   108                              <1> 	;
   109                              <1> 	; Modified registers: eax, ebx, edx
   110                              <1> 	;
   111                              <1> 
   112                              <1> srunseq_0:
   113 0000F96F 3A05[B3030300]      <1>         cmp     al, [u.uno]     ; same process ?
   114 0000F975 750C                <1> 	jne	short srunseq_2 ; no
   115                              <1> 
   116 0000F977 8A25[A9030300]      <1> 	mov	ah, [u.pri] 	; present/current priority
   117 0000F97D 80FC02              <1> 	cmp	ah, 2       	; 'run for event' priority level
   118 0000F980 7221                <1> 	jb	short srunseq_6 ; no
   119                              <1> 
   120                              <1> srunseq_1:
   121                              <1> 	; there is nothing to do!
   122 0000F982 C3                  <1> 	retn
   123                              <1> 
   124                              <1> srunseq_2:
   125                              <1> 	;;this not necessary ! 23/12/2016
   126                              <1>         ;;cmp	al, nproc	; number of processes = 16 
   127                              <1> 	;;jnb	short srunseq_5	; error ! invalid process number 
   128                              <1> 
   129                              <1> 	; dl = priority
   130 0000F983 80FA02              <1> 	cmp	dl, 2 		; event queue
   131 0000F986 72FA                <1> 	jb	short srunseq_1 ; requested process is not present
   132                              <1> 				; process and priority of requested
   133                              <1> 				; process is not high (event), 
   134                              <1> 				; there is nothing to do!
   135                              <1> 	
   136                              <1> 	; requested process is not present process
   137                              <1> 	; & priority of requested process is high
   138 0000F988 3A15[A9030300]      <1> 	cmp	dl, [u.pri] 	; priority of present process
   139 0000F98E 7606                <1> 	jna	short srunseq_3 ; is high, also
   140                              <1> 	;
   141                              <1> 	; present process will be swapped/switched out
   142 0000F990 FE05[51650100]      <1> 	inc	byte [p_change] ; 1
   143                              <1> 
   144                              <1> srunseq_3:
   145                              <1> 	; add process to 'runq_event' queue for new event
   146 0000F996 BB[52030300]        <1> 	mov	ebx, runq_event ; high priority run queue
   147                              <1> 
   148                              <1> srunseq_4:
   149                              <1> 	; al = process number
   150                              <1> 	; ebx = run queue
   151 0000F99B E881EDFFFF          <1> 	call	putlu
   152 0000F9A0 C3                  <1> 	retn
   153                              <1> 
   154                              <1> srunseq_5:
   155 0000F9A1 F5                  <1> 	cmc
   156 0000F9A2 C3                  <1> 	retn
   157                              <1> 
   158                              <1> srunseq_6:
   159                              <1> 	; present priority of the process is not high
   160                              <1> 	
   161 0000F9A3 8815[A9030300]      <1> 	mov	[u.pri], dl ; new priority 
   162                              <1> 			    ; (will be used by 'tswap')
   163                              <1> 
   164 0000F9A9 80FA02              <1> 	cmp	dl, 2 		; high priority ?
   165 0000F9AC 72F3                <1> 	jb	short srunseq_5 ; no, there is nothing to do
   166                              <1> 				; in addition
   167                              <1> 
   168                              <1> 	; process must be added to relevant run queue, here!
   169                              <1> 	; (new priority is high/event priority and process
   170                              <1> 	; will not be added to a run queue by 'tswap')
   171                              <1> 
   172 0000F9AE BB[54030300]        <1> 	mov	ebx, runq_normal ; 'run as regular' queue
   173                              <1> 
   174 0000F9B3 20E4                <1> 	and	ah, ah  ;  previous value of [u.pri]
   175 0000F9B5 75E4                <1> 	jnz	short srunseq_4
   176                              <1> 
   177 0000F9B7 43                  <1> 	inc	ebx
   178 0000F9B8 43                  <1> 	inc	ebx
   179                              <1> 	; ebx = runq_background ; 'run on backgroud' queue 
   180                              <1> 
   181 0000F9B9 EBE0                <1> 	jmp	short srunseq_4
   182                              <1> clock:
   183                              <1> 	; 23/05/2016
   184                              <1> 	; 22/05/2016
   185                              <1> 	; 20/05/2016
   186                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
   187                              <1> 	; 14/05/2015 - 14/10/2015 (Retro UNIX 386 v1)
   188                              <1> 	; 07/12/2013 - 10/04/2014 (Retro UNIX 8086 v1)
   189                              <1> 
   190 0000F9BB 803D[A8030300]00    <1> 	cmp	byte [u.quant], 0
   191 0000F9C2 772C                <1> 	ja	short clk_1
   192                              <1> 	;
   193 0000F9C4 803D[B3030300]01    <1> 	cmp     byte [u.uno], 1 ; /etc/init ? (for Retro UNIX 8086 & 386 v1)
   194                              <1> 				; MainProg (Kernel's Command Interpreter)
   195                              <1> 				; for TRDOS 386.
   196 0000F9CB 7623                <1> 	jna	short clk_1 ; yes, do not swap out
   197                              <1> 	;
   198 0000F9CD 803D[5B030300]FF    <1> 	cmp     byte [sysflg], 0FFh ; user or system space ?
   199 0000F9D4 7520                <1> 	jne	short clk_2 	    ; system space (sysflg <> 0FFh)
   200                              <1> 	;
   201 0000F9D6 66833D[AA030300]00  <1> 	cmp	word [u.intr], 0
   202 0000F9DE 7616                <1> 	jna	short clk_2
   203                              <1> 	;
   204                              <1> 	; 23/05/2016
   205 0000F9E0 803D[52650100]00    <1> 	cmp	byte [multi_tasking], 0
   206 0000F9E7 760D                <1> 	jna	short clk_2
   207                              <1> 	;
   208 0000F9E9 FE05[51650100]      <1> 	inc	byte [p_change] ; it is time to change running process	
   209 0000F9EF C3                  <1> 	retn
   210                              <1> clk_1:
   211 0000F9F0 FE0D[A8030300]      <1> 	dec	byte [u.quant]
   212                              <1> clk_2:
   213 0000F9F6 C3                  <1> 	retn   ; return to (hardware) timer interrupt routine
   214                              <1> 
   215                              <1> ; 12/10/2017
   216                              <1> ; 15/01/2017
   217                              <1> ; 14/01/2017
   218                              <1> ; 07/01/2017
   219                              <1> ; 02/01/2017
   220                              <1> ; 17/08/2016
   221                              <1> ; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   222                              <1> int34h:  ; #IOCTL# (I/O port access support for ring 3)
   223                              <1> ; 23/05/2016
   224                              <1> 	; 20/06/2016
   225                              <1> 	; 29/04/2016 - TRDOS 386 (TRDOS v2.0)
   226                              <1> 	;
   227                              <1> 	; INPUT ->
   228                              <1> 	;	AH = 0 -> read port  (physical IO port) -byte-
   229                              <1> 	;	AH = 1 -> write port (physical IO port) -byte-
   230                              <1> 	;		AL = data byte
   231                              <1> 	;	AH = 2 -> read port  (physical IO port) -word-
   232                              <1> 	;	AH = 3 -> write port (physical IO port) -word-
   233                              <1> 	;		BX = data word
   234                              <1> 	;	AH = 4 -> read port  (physical IO port) -dword-
   235                              <1> 	;	AH = 5 -> write port (physical IO port) -dword-
   236                              <1> 	;		EBX = data dword
   237                              <1> 	;	; 12/10/2017
   238                              <1> 	;	AH = 6 -> read port (physical IO port) twice -byte-
   239                              <1> 	;	AH = 7 -> write port (physical IO port) twice -byte-
   240                              <1> 	;		BX = data word	
   241                              <1> 	;
   242                              <1> 	;	DX = Port number (<= 0FFFFh)
   243                              <1> 	;
   244                              <1> 	; OUTPUT ->
   245                              <1> 	;	AL = data byte (in al, dx)
   246                              <1> 	;	AX = data word (in ax, dx)
   247                              <1> 	;	EAX = data dword (in eax, dx)
   248                              <1> 	;
   249                              <1> 	;	(ECX = actual TRANSFER COUNT for string functions)
   250                              <1> 	;
   251                              <1> 	;
   252                              <1> 	; Modified registers: EAX
   253                              <1> 	;
   254                              <1> 
   255                              <1> 	;cmp	ah, 5
   256                              <1> 	;ja	short int34h_5 ; invalid function !
   257                              <1> 
   258                              <1> 	; 12/10/2017
   259 0000F9F7 80FC07              <1> 	cmp	ah, 7
   260 0000F9FA 7743                <1> 	ja	short int34h_5 ; invalid function !
   261                              <1> 
   262                              <1> 	;; 15/01/2017
   263                              <1> 	; 14/01/2017
   264                              <1> 	; 02/01/2017
   265                              <1> 	;;mov	byte [ss:intflg], 34h	; IOCTL interrupt 
   266 0000F9FC FB                  <1> 	sti
   267                              <1> 	
   268                              <1> 	;sti	; enable interrupts
   269 0000F9FD 80642408FE          <1> 	and	byte [esp+8], 11111110b	; clear carry bit of eflags register
   270                              <1> 
   271 0000FA02 80FC01              <1> 	cmp	ah, 1
   272 0000FA05 7205                <1> 	jb	short int34h_0
   273 0000FA07 7705                <1> 	ja	short int34h_1
   274                              <1> 
   275 0000FA09 EE                  <1> 	out	dx, al
   276                              <1> 	;iretd
   277 0000FA0A EB01                <1> 	jmp short int34h_iret
   278                              <1> 
   279                              <1> int34h_0:
   280 0000FA0C EC                  <1> 	in	al, dx
   281                              <1> 	;iretd
   282                              <1> int34h_iret:
   283                              <1> 	;cli	; 07/01/2017
   284                              <1> 	;; 15/01/2017
   285                              <1> 	;;mov	byte [ss:intflg], 0 ; reset
   286 0000FA0D CF                  <1> 	iretd 
   287                              <1> 
   288                              <1> int34h_1:
   289 0000FA0E F6C401              <1> 	test	ah, 1
   290 0000FA11 7516                <1> 	jnz	short int34h_3 ; out
   291                              <1> 
   292                              <1> 	; in
   293 0000FA13 80FC02              <1> 	cmp	ah, 2
   294 0000FA16 7707                <1> 	ja	short int34h_2
   295                              <1> 
   296 0000FA18 6689D8              <1> 	mov	ax, bx
   297 0000FA1B 66ED                <1> 	in	ax, dx
   298                              <1> 	;iretd
   299 0000FA1D EBEE                <1> 	jmp	short int34h_iret
   300                              <1> 
   301                              <1> int34h_2:
   302 0000FA1F 80FC04              <1> 	cmp	ah, 4
   303 0000FA22 772C                <1> 	ja	short int34h_7	; 12/10/2017
   304                              <1> 	; ah = 4
   305 0000FA24 89D8                <1> 	mov	eax, ebx
   306 0000FA26 ED                  <1> 	in	eax, dx
   307                              <1> 	;iretd
   308 0000FA27 EBE4                <1> 	jmp	short int34h_iret
   309                              <1> 
   310                              <1> int34h_3:
   311 0000FA29 80FC03              <1> 	cmp	ah, 3
   312 0000FA2C 7707                <1> 	ja	short int34h_4
   313                              <1> 
   314 0000FA2E 6689D8              <1> 	mov	ax, bx
   315 0000FA31 66EF                <1> 	out	dx, ax
   316                              <1> 	;iretd
   317 0000FA33 EBD8                <1> 	jmp	short int34h_iret
   318                              <1> 
   319                              <1> int34h_4:
   320 0000FA35 80FC05              <1> 	cmp	ah, 5
   321 0000FA38 770B                <1> 	ja	short int34h_6	; 12/10/2017
   322                              <1> 	; ah = 5
   323 0000FA3A 89D8                <1> 	mov	eax, ebx
   324 0000FA3C EF                  <1> 	out	dx, eax
   325                              <1> 	;iretd
   326 0000FA3D EBCE                <1> 	jmp	short int34h_iret
   327                              <1> 
   328                              <1> int34h_5:
   329 0000FA3F 804C240801          <1> 	or	byte [esp+8], 1	; set carry bit of eflags register
   330 0000FA44 CF                  <1> 	iretd
   331                              <1> 
   332                              <1> 	; 12/10/2017
   333                              <1> int34h_6:
   334 0000FA45 6689D8              <1> 	mov	ax, bx
   335 0000FA48 EE                  <1> 	out	dx, al
   336 0000FA49 EB00                <1> 	jmp	short $+2
   337 0000FA4B 86E0                <1> 	xchg	ah, al
   338 0000FA4D EE                  <1> 	out	dx, al
   339                              <1> 	;xchg	al, ah
   340                              <1> 	;iretd
   341 0000FA4E EB06                <1> 	jmp	short int34h_8
   342                              <1> int34h_7:
   343 0000FA50 EC                  <1> 	in	al, dx
   344 0000FA51 EB00                <1> 	jmp	short $+2
   345 0000FA53 88C4                <1> 	mov	ah, al
   346 0000FA55 EC                  <1> 	in	al, dx
   347                              <1> int34h_8:
   348 0000FA56 86C4                <1> 	xchg	al, ah
   349 0000FA58 CF                  <1> 	iretd
   350                              <1> 			
   351                              <1> 
   352                              <1> INT4Ah:
   353                              <1> 	; 24/01/2016
   354                              <1> 	; this procedure will be called by 'RTC_INT' (in 'timer.s')
   355 0000FA59 C3                  <1> 	retn
   356                              <1> 
   357                              <1> ; u0.s
   358                              <1> ; Retro UNIX 386 v1 Kernel (v0.2) - SYS0.INC
   359                              <1> ; Last Modification: 20/11/2015
   360                              <1> 
   361                              <1> com2_int:
   362                              <1> 	; 07/11/2015 
   363                              <1> 	; 24/10/2015
   364                              <1> 	; 23/10/2015
   365                              <1> 	; 14/03/2015 (Retro UNIX 386 v1 - Beginning)
   366                              <1> 	; 28/07/2014 (Retro UNIX 8086 v1)
   367                              <1> 	; < serial port 2 interrupt handler >
   368                              <1> 	;
   369 0000FA5A 890424              <1> 	mov 	[esp], eax ; overwrite call return address
   370                              <1> 	;push	eax
   371 0000FA5D 66B80900            <1> 	mov	ax, 9
   372 0000FA61 EB07                <1> 	jmp	short comm_int
   373                              <1> com1_int:
   374                              <1> 	; 07/11/2015
   375                              <1> 	; 24/10/2015
   376 0000FA63 890424              <1> 	mov 	[esp], eax ; overwrite call return address
   377                              <1> 	; 23/10/2015
   378                              <1> 	;push	eax
   379 0000FA66 66B80800            <1> 	mov	ax, 8
   380                              <1> comm_int:
   381                              <1> 	; 20/11/2015
   382                              <1> 	; 18/11/2015
   383                              <1> 	; 17/11/2015
   384                              <1> 	; 16/11/2015
   385                              <1> 	; 09/11/2015
   386                              <1> 	; 08/11/2015
   387                              <1> 	; 07/11/2015
   388                              <1> 	; 06/11/2015 (serial4.asm, 'serial')	
   389                              <1> 	; 01/11/2015
   390                              <1> 	; 26/10/2015
   391                              <1> 	; 23/10/2015
   392 0000FA6A 53                  <1> 	push	ebx
   393 0000FA6B 56                  <1> 	push	esi
   394 0000FA6C 57                  <1> 	push	edi
   395 0000FA6D 1E                  <1> 	push 	ds
   396 0000FA6E 06                  <1> 	push 	es
   397                              <1> 	; 18/11/2015
   398 0000FA6F 0F20DB              <1> 	mov	ebx, cr3
   399 0000FA72 53                  <1> 	push	ebx ; ****
   400                              <1> 	;
   401 0000FA73 51                  <1> 	push	ecx ; ***
   402 0000FA74 52                  <1> 	push	edx ; **
   403                              <1> 	;
   404 0000FA75 BB10000000          <1> 	mov	ebx, KDATA
   405 0000FA7A 8EDB                <1> 	mov	ds, bx
   406 0000FA7C 8EC3                <1> 	mov	es, bx
   407                              <1> 	;
   408 0000FA7E 8B0D[C0580100]      <1> 	mov	ecx, [k_page_dir]
   409 0000FA84 0F22D9              <1> 	mov	cr3, ecx
   410                              <1> 	; 20/11/2015
   411                              <1> 	; Interrupt identification register
   412 0000FA87 66BAFA02            <1> 	mov	dx, 2FAh ; COM2
   413                              <1> 	;
   414 0000FA8B 3C08                <1> 	cmp 	al, 8 
   415 0000FA8D 7702                <1> 	ja 	short com_i0
   416                              <1> 	;
   417                              <1> 	; 20/11/2015
   418                              <1> 	; 17/11/2015
   419                              <1> 	; 16/11/2015
   420                              <1> 	; 15/11/2015
   421                              <1> 	; 24/10/2015
   422                              <1> 	; 14/03/2015 (Retro UNIX 386 v1 - Beginning)
   423                              <1> 	; 28/07/2014 (Retro UNIX 8086 v1)
   424                              <1> 	; < serial port 1 interrupt handler >
   425                              <1> 	;
   426 0000FA8F FEC6                <1> 	inc	dh ; 3FAh ; COM1 Interrupt id. register
   427                              <1> com_i0:
   428                              <1> 	;push	eax ; *
   429                              <1> 	; 07/11/2015
   430 0000FA91 A2[2A590100]        <1> 	mov 	byte [ccomport], al
   431                              <1> 	; 09/11/2015
   432 0000FA96 0FB7D8              <1> 	movzx	ebx, ax ; 8 or 9
   433                              <1> 	; 17/11/2015
   434                              <1>  	; reset request for response status
   435 0000FA99 88A3[20590100]      <1> 	mov	[ebx+req_resp-8], ah ; 0
   436                              <1> 	;
   437                              <1> 	; 20/11/2015
   438 0000FA9F EC                  <1> 	in	al, dx		; read interrupt id. register
   439 0000FAA0 EB00                <1> 	JMP	$+2	   	; I/O DELAY
   440 0000FAA2 2404                <1> 	and	al, 4		; received data available?	
   441 0000FAA4 7470                <1> 	jz	short com_eoi	; (transmit. holding reg. empty)
   442                              <1> 	;
   443                              <1> 	; 20/11/2015
   444 0000FAA6 80EA02              <1> 	sub	dl, 3FAh-3F8h	; data register (3F8h, 2F8h)
   445 0000FAA9 EC                  <1> 	in	al, dx     	; read character
   446                              <1> 	;JMP	$+2	   	; I/O DELAY
   447                              <1> 	; 08/11/2015
   448                              <1> 	; 07/11/2015
   449 0000FAAA 89DE                <1> 	mov	esi, ebx 
   450 0000FAAC 89DF                <1> 	mov	edi, ebx
   451 0000FAAE 81C6[24590100]      <1> 	add 	esi, rchar - 8 ; points to last received char
   452 0000FAB4 81C7[26590100]      <1> 	add	edi, schar - 8 ; points to last sent char
   453 0000FABA 8806                <1> 	mov	[esi], al ; received char (current char)
   454                              <1> 	; query
   455 0000FABC 20C0                <1> 	and	al, al
   456 0000FABE 7527                <1> 	jnz	short com_i2
   457                              <1>    	; response
   458                              <1> 	; 17/11/2015
   459                              <1> 	; set request for response status
   460 0000FAC0 FE83[20590100]      <1>         inc     byte [ebx+req_resp-8] ; 1 
   461                              <1> 	;
   462 0000FAC6 6683C205            <1> 	add	dx, 3FDh-3F8h	; (3FDh, 2FDh)
   463 0000FACA EC                  <1> 	in	al, dx	   	; read line status register 
   464 0000FACB EB00                <1> 	JMP	$+2	   	; I/O DELAY
   465 0000FACD 2420                <1> 	and	al, 20h	   	; transmitter holding reg. empty?
   466 0000FACF 7445                <1> 	jz	short com_eoi 	; no
   467 0000FAD1 B0FF                <1> 	mov 	al, 0FFh   	; response			
   468 0000FAD3 6683EA05            <1> 	sub	dx, 3FDh-3F8h 	; data port (3F8h, 2F8h)
   469 0000FAD7 EE                  <1> 	out	dx, al	   	; send on serial port
   470                              <1> 	; 17/11/2015
   471 0000FAD8 803F00              <1> 	cmp 	byte [edi], 0   ; query ? (schar)
   472 0000FADB 7502                <1> 	jne 	short com_i1    ; no
   473 0000FADD 8807                <1> 	mov	[edi], al 	; 0FFh (responded)
   474                              <1> com_i1:
   475                              <1> 	; 17/11/2015
   476                              <1> 	; reset request for response status (again)
   477 0000FADF FE8B[20590100]      <1>         dec     byte [ebx+req_resp-8] ; 0 
   478 0000FAE5 EB2F                <1> 	jmp	short com_eoi
   479                              <1> com_i2:	
   480                              <1> 	; 08/11/2015
   481 0000FAE7 3CFF                <1> 	cmp 	al, 0FFh	; (response ?)
   482 0000FAE9 7417                <1> 	je	short com_i3	; (check for response signal)
   483                              <1> 	; 07/11/2015
   484 0000FAEB 3C04                <1> 	cmp	al, 04h	; EOT
   485 0000FAED 751C                <1> 	jne	short com_i4	
   486                              <1> 	; EOT = 04h (End of Transmit) - 'CTRL + D'
   487                              <1> 	;(an EOT char is supposed as a ctrl+brk from the terminal)
   488                              <1> 	; 08/11/2015
   489                              <1> 		; ptty -> tty 0 to 7 (pseudo screens)
   490 0000FAEF 861D[EE580100]      <1> 	xchg	bl, [ptty]  ; tty number (8 or 9)
   491 0000FAF5 E84C69FFFF          <1> 	call 	ctrlbrk
   492 0000FAFA 861D[EE580100]      <1> 	xchg	[ptty], bl ; (restore ptty value and BL value)
   493                              <1> 	;mov	al, 04h ; EOT
   494                              <1> 	; 08/11/2015
   495 0000FB00 EB09                <1> 	jmp	short com_i4	
   496                              <1> com_i3:
   497                              <1> 	; 08/11/2015
   498                              <1> 	; If 0FFh has been received just after a query
   499                              <1> 	; (schar, ZERO), it is a response signal.
   500                              <1> 	; 17/11/2015
   501 0000FB02 803F00              <1>         cmp     byte [edi], 0 ; query ? (schar)
   502 0000FB05 7704                <1> 	ja	short com_i4 ; no
   503                              <1> 	; reset query status (schar)
   504 0000FB07 8807                <1> 	mov	[edi], al ; 0FFh
   505 0000FB09 FEC0                <1> 	inc	al ; 0
   506                              <1> com_i4:
   507                              <1> 	; 27/07/2014
   508                              <1> 	; 09/07/2014
   509 0000FB0B D0E3                <1> 	shl	bl, 1	
   510 0000FB0D 81C3[F0580100]      <1> 	add	ebx, ttychr
   511                              <1> 	; 23/07/2014 (always overwrite)
   512                              <1> 	;;cmp	word [ebx], 0
   513                              <1> 	;;ja	short com_eoi
   514                              <1> 	;
   515 0000FB13 668903              <1> 	mov	[ebx], ax   ; Save ascii code
   516                              <1> 			    ; scan code = 0
   517                              <1> com_eoi:
   518                              <1> 	;mov	al, 20h
   519                              <1> 	;out	20h, al	   ; end of interrupt
   520                              <1> 	;
   521                              <1> 	; 07/11/2015
   522                              <1>       	;pop	eax ; *
   523 0000FB16 A0[2A590100]        <1> 	mov	al, byte [ccomport] ; current COM port
   524                              <1> 	 ; al = tty number (8 or 9)
   525 0000FB1B E85E010000          <1>         call	wakeup
   526                              <1> com_iret:
   527                              <1> 	; 23/10/2015
   528 0000FB20 5A                  <1> 	pop	edx ; **
   529 0000FB21 59                  <1> 	pop	ecx ; ***
   530                              <1> 	; 18/11/2015
   531                              <1> 	;pop	eax ; ****
   532                              <1> 	;mov	cr3, eax
   533                              <1> 	;jmp	iiret
   534 0000FB22 E9C20FFFFF          <1> 	jmp	iiretp
   535                              <1> 
   536                              <1> ;iiretp: ; 01/09/2015
   537                              <1> ;	; 28/08/2015
   538                              <1> ;	pop	eax ; (*) page directory
   539                              <1> ;	mov	cr3, eax
   540                              <1> ;iiret:
   541                              <1> ;	; 22/08/2014
   542                              <1> ;	mov	al, 20h ; END OF INTERRUPT COMMAND TO 8259
   543                              <1> ;	out	20h, al	; 8259 PORT
   544                              <1> ;	;
   545                              <1> ;	pop	es
   546                              <1> ;	pop	ds
   547                              <1> ;	pop	edi
   548                              <1> ;	pop	esi
   549                              <1> ;	pop	ebx ; 29/08/2014
   550                              <1> ;	pop 	eax
   551                              <1> ;	iretd
   552                              <1> 
   553                              <1> sp_init:
   554                              <1> 	; 07/11/2015
   555                              <1> 	; 29/10/2015
   556                              <1> 	; 26/10/2015
   557                              <1> 	; 23/10/2015
   558                              <1> 	; 29/06/2015
   559                              <1> 	; 14/03/2015 (Retro UNIX 386 v1 - 115200 baud)
   560                              <1> 	; 28/07/2014 (Retro UNIX 8086 v1 - 9600 baud)
   561                              <1> 	; Initialization of Serial Port Communication Parameters
   562                              <1> 	; (COM1 base port address = 3F8h, COM1 Interrupt = IRQ 4)
   563                              <1> 	; (COM2 base port address = 2F8h, COM1 Interrupt = IRQ 3)
   564                              <1> 	;
   565                              <1> 	; ((Modified registers: EAX, ECX, EDX, EBX))
   566                              <1> 	;
   567                              <1> 	; INPUT:  (29/06/2015)
   568                              <1> 	;	AL = 0 for COM1
   569                              <1> 	;	     1 for COM2
   570                              <1> 	;	AH = Communication parameters	
   571                              <1> 	;
   572                              <1> 	;  (*) Communication parameters (except BAUD RATE):
   573                              <1> 	;	Bit	4	3	2	1	0
   574                              <1> 	;		-PARITY--   STOP BIT  -WORD LENGTH-	 		 
   575                              <1> 	;  this one -->	00 = none    0 = 1 bit  11 = 8 bits
   576                              <1> 	;		01 = odd     1 = 2 bits	10 = 7 bits
   577                              <1> 	;		11 = even
   578                              <1> 	;  Baud rate setting bits: (29/06/2015)
   579                              <1> 	;		Retro UNIX 386 v1 feature only !
   580                              <1> 	;	Bit	7    6    5  | Baud rate
   581                              <1> 	;		------------------------
   582                              <1> 	;	value	0    0    0  | Default (Divisor = 1)
   583                              <1> 	;		0    0    1  | 9600 (12)
   584                              <1> 	;		0    1    0  | 19200 (6) 
   585                              <1> 	;		0    1	  1  | 38400 (3) 
   586                              <1> 	;		1    0	  0  | 14400 (8)
   587                              <1> 	;		1    0	  1  | 28800 (4)
   588                              <1> 	;		1    1    0  | 57600 (2)
   589                              <1> 	;		1    1    1  | 115200 (1) 	
   590                              <1> 	
   591                              <1> 	; References:	
   592                              <1> 	; (1) IBM PC-XT Model 286 BIOS Source Code
   593                              <1> 	;     RS232.ASM --- 10/06/1985 COMMUNICATIONS BIOS (RS232)
   594                              <1> 	; (2) Award BIOS 1999 - ATORGS.ASM
   595                              <1> 	; (3) http://wiki.osdev.org/Serial_Ports
   596                              <1> 	;
   597                              <1> 	; Set communication parameters for COM1 (= 03h)	
   598                              <1> 	;
   599 0000FB27 BB[26590100]        <1> 	mov	ebx, com1p		; COM1 parameters  
   600 0000FB2C 66BAF803            <1> 	mov	dx, 3F8h		; COM1
   601                              <1> 	 ; 29/10/2015
   602 0000FB30 66B90103            <1> 	mov	cx, 301h  ; divisor = 1 (115200 baud)
   603 0000FB34 E86F000000          <1> 	call	sp_i3	; call A4	
   604 0000FB39 A880                <1> 	test	al, 80h
   605 0000FB3B 7410                <1> 	jz	short sp_i0 ; OK..
   606                              <1> 		; Error !
   607                              <1> 	;mov	dx, 3F8h
   608 0000FB3D 80EA05              <1> 	sub	dl, 5 ; 3FDh -> 3F8h
   609 0000FB40 66B90E03            <1> 	mov	cx, 30Eh  ; divisor = 12 (9600 baud)
   610 0000FB44 E85F000000          <1> 	call	sp_i3	; call A4	
   611 0000FB49 A880                <1> 	test	al, 80h
   612 0000FB4B 7508                <1> 	jnz	short sp_i1
   613                              <1> sp_i0:
   614                              <1>         ; (Note: Serial port interrupts will be disabled here...)	
   615                              <1>         ; (INT 14h initialization code disables interrupts.)
   616                              <1> 	;
   617 0000FB4D C603E3              <1> 	mov	byte [ebx], 0E3h ; 11100011b
   618 0000FB50 E8DC000000          <1> 	call	sp_i5 ; 29/06/2015
   619                              <1> sp_i1:
   620 0000FB55 43                  <1> 	inc	ebx
   621 0000FB56 66BAF802            <1> 	mov	dx, 2F8h		; COM2
   622                              <1> 	 ; 29/10/2015
   623 0000FB5A 66B90103            <1> 	mov	cx, 301h  ; divisor = 1 (115200 baud)
   624 0000FB5E E845000000          <1> 	call	sp_i3	; call A4	
   625 0000FB63 A880                <1> 	test	al, 80h
   626 0000FB65 7410                <1> 	jz	short sp_i2 ; OK..
   627                              <1> 		; Error !
   628                              <1> 	;mov	dx, 2F8h
   629 0000FB67 80EA05              <1> 	sub	dl, 5 ; 2FDh -> 2F8h
   630 0000FB6A 66B90E03            <1> 	mov	cx, 30Eh  ; divisor = 12 (9600 baud)
   631 0000FB6E E835000000          <1> 	call	sp_i3	; call A4	
   632 0000FB73 A880                <1> 	test	al, 80h
   633 0000FB75 7530                <1> 	jnz	short sp_i7
   634                              <1> sp_i2:
   635 0000FB77 C603E3              <1> 	mov	byte [ebx], 0E3h ; 11100011b
   636                              <1> sp_i6:
   637                              <1> 	;; COM2 - enabling IRQ 3
   638                              <1> 	; 07/11/2015
   639                              <1> 	; 26/10/2015
   640 0000FB7A 9C                  <1> 	pushf
   641 0000FB7B FA                  <1> 	cli
   642                              <1> 	;
   643 0000FB7C 66BAFC02            <1> 	mov	dx, 2FCh   		; modem control register
   644 0000FB80 EC                  <1> 	in	al, dx 	   		; read register
   645 0000FB81 EB00                <1> 	JMP	$+2	   		; I/O DELAY
   646 0000FB83 0C08                <1> 	or	al, 8      		; enable bit 3 (OUT2)
   647 0000FB85 EE                  <1> 	out	dx, al     		; write back to register
   648 0000FB86 EB00                <1> 	JMP	$+2	   		; I/O DELAY
   649 0000FB88 66BAF902            <1> 	mov	dx, 2F9h   		; interrupt enable register
   650 0000FB8C EC                  <1> 	in	al, dx     		; read register
   651 0000FB8D EB00                <1> 	JMP	$+2	   		; I/O DELAY
   652                              <1> 	;or	al, 1      		; receiver data interrupt enable and
   653 0000FB8F 0C03                <1> 	or	al, 3	   		; transmitter empty interrupt enable
   654 0000FB91 EE                  <1> 	out	dx, al 	   		; write back to register
   655 0000FB92 EB00                <1> 	JMP	$+2        		; I/O DELAY
   656 0000FB94 E421                <1> 	in	al, 21h    		; read interrupt mask register
   657 0000FB96 EB00                <1> 	JMP	$+2	   		; I/O DELAY
   658 0000FB98 24F7                <1> 	and	al, 0F7h   		; enable IRQ 3 (COM2)
   659 0000FB9A E621                <1> 	out	21h, al    		; write back to register
   660                              <1> 	;
   661                              <1> 	; 23/10/2015
   662 0000FB9C B8[5AFA0000]        <1> 	mov 	eax, com2_int
   663 0000FBA1 A3[79FC0000]        <1> 	mov	[com2_irq3], eax
   664                              <1> 	; 26/10/2015
   665 0000FBA6 9D                  <1> 	popf	
   666                              <1> sp_i7:
   667 0000FBA7 C3                  <1> 	retn
   668                              <1> 
   669                              <1> sp_i3:
   670                              <1> ;A4:  	;-----	INITIALIZE THE COMMUNICATIONS PORT
   671                              <1> 	; 28/10/2015
   672 0000FBA8 FEC2                <1> 	inc	dl	; 3F9h (2F9h)	; 3F9h, COM1 Interrupt enable register 
   673 0000FBAA B000                <1> 	mov	al, 0
   674 0000FBAC EE                  <1> 	out	dx, al			; disable serial port interrupt
   675 0000FBAD EB00                <1> 	JMP	$+2			; I/O DELAY
   676 0000FBAF 80C202              <1> 	add	dl, 2 	; 3FBh (2FBh)	; COM1 Line control register (3FBh)
   677 0000FBB2 B080                <1> 	mov	al, 80h			
   678 0000FBB4 EE                  <1> 	out	dx, al			; SET DLAB=1 ; divisor latch access bit
   679                              <1> 	;-----	SET BAUD RATE DIVISOR
   680                              <1> 	; 26/10/2015
   681 0000FBB5 80EA03              <1> 	sub 	dl, 3   ; 3F8h (2F8h)	; register for least significant byte
   682                              <1> 					; of the divisor value
   683 0000FBB8 88C8                <1> 	mov	al, cl	; 1
   684 0000FBBA EE                  <1> 	out	dx, al			; 1 = 115200 baud (Retro UNIX 386 v1)
   685                              <1> 					; 2 = 57600 baud
   686                              <1> 					; 3 = 38400 baud
   687                              <1> 					; 6 = 19200 baud
   688                              <1> 					; 12 = 9600 baud (Retro UNIX 8086 v1)
   689 0000FBBB EB00                <1> 	JMP	$+2			; I/O DELAY
   690 0000FBBD 28C0                <1> 	sub	al, al
   691 0000FBBF FEC2                <1> 	inc	dl      ; 3F9h (2F9h)	; register for most significant byte
   692                              <1> 					; of the divisor value
   693 0000FBC1 EE                  <1> 	out	dx, al ; 0
   694 0000FBC2 EB00                <1> 	JMP	$+2			; I/O DELAY
   695                              <1> 	;	
   696 0000FBC4 88E8                <1> 	mov	al, ch ; 3		; 8 data bits, 1 stop bit, no parity
   697                              <1> 	;and	al, 1Fh ; Bits 0,1,2,3,4	
   698 0000FBC6 80C202              <1> 	add	dl, 2	; 3FBh (2FBh)	; Line control register
   699 0000FBC9 EE                  <1> 	out	dx, al			
   700 0000FBCA EB00                <1> 	JMP	$+2			; I/O DELAY
   701                              <1> 	; 29/10/2015
   702 0000FBCC FECA                <1> 	dec 	dl 	; 3FAh (2FAh)	; FIFO Control register (16550/16750)
   703 0000FBCE 30C0                <1> 	xor	al, al			; 0
   704 0000FBD0 EE                  <1> 	out	dx, al			; Disable FIFOs (reset to 8250 mode)
   705 0000FBD1 EB00                <1> 	JMP	$+2	
   706                              <1> sp_i4:
   707                              <1> ;A18:	;-----	COMM PORT STATUS ROUTINE
   708                              <1> 	; 29/06/2015 (line status after modem status)
   709 0000FBD3 80C204              <1> 	add	dl, 4	; 3FEh (2FEh)	; Modem status register
   710                              <1> sp_i4s:
   711 0000FBD6 EC                  <1> 	in	al, dx			; GET MODEM CONTROL STATUS
   712 0000FBD7 EB00                <1> 	JMP	$+2			; I/O DELAY
   713 0000FBD9 88C4                <1> 	mov	ah, al			; PUT IN (AH) FOR RETURN
   714 0000FBDB FECA                <1> 	dec	dl	; 3FDh (2FDh)	; POINT TO LINE STATUS REGISTER
   715                              <1> 					; dx = 3FDh for COM1, 2FDh for COM2
   716 0000FBDD EC                  <1> 	in	al, dx			; GET LINE CONTROL STATUS
   717                              <1> 	; AL = Line status, AH = Modem status
   718 0000FBDE C3                  <1> 	retn
   719                              <1> 
   720                              <1> sp_status:
   721                              <1> 	; 29/06/2015
   722                              <1> 	; 27/06/2015 (Retro UNIX 386 v1)
   723                              <1> 	; Get serial port status
   724 0000FBDF 66BAFE03            <1> 	mov	dx, 3FEh		; Modem status register (COM1)
   725 0000FBE3 28C6                <1> 	sub	dh, al			; dh = 2 for COM2 (al = 1)
   726                              <1> 					; dx = 2FEh for COM2
   727 0000FBE5 EBEF                <1> 	jmp	short sp_i4s
   728                              <1> 
   729                              <1> sp_setp: ; Set serial port communication parameters
   730                              <1> 	; 07/11/2015
   731                              <1> 	; 29/10/2015
   732                              <1> 	; 29/06/2015
   733                              <1> 	; Retro UNIX 386 v1 feature only !	
   734                              <1> 	;
   735                              <1> 	; INPUT:
   736                              <1> 	;	AL = 0 for COM1
   737                              <1> 	;	     1 for COM2
   738                              <1> 	;	AH = Communication parameters (*)
   739                              <1> 	; OUTPUT:
   740                              <1> 	;	CL = Line status
   741                              <1> 	;	CH = Modem status
   742                              <1> 	;   If cf = 1 -> Error code in [u.error]
   743                              <1> 	;		 'invalid parameter !' 
   744                              <1> 	;		 	 or
   745                              <1> 	;		 'device not ready !' error
   746                              <1> 	;	
   747                              <1> 	;  (*) Communication parameters (except BAUD RATE):
   748                              <1> 	;	Bit	4	3	2	1	0
   749                              <1> 	;		-PARITY--   STOP BIT  -WORD LENGTH-	 		 
   750                              <1> 	;  this one -->	00 = none    0 = 1 bit  11 = 8 bits
   751                              <1> 	;		01 = odd     1 = 2 bits	10 = 7 bits
   752                              <1> 	;		11 = even
   753                              <1> 	;  Baud rate setting bits: (29/06/2015)
   754                              <1> 	;		Retro UNIX 386 v1 feature only !
   755                              <1> 	;	Bit	7    6    5  | Baud rate
   756                              <1> 	;		------------------------
   757                              <1> 	;	value	0    0    0  | Default (Divisor = 1)
   758                              <1> 	;		0    0    1  | 9600 (12)
   759                              <1> 	;		0    1    0  | 19200 (6) 
   760                              <1> 	;		0    1	  1  | 38400 (3) 
   761                              <1> 	;		1    0	  0  | 14400 (8)
   762                              <1> 	;		1    0	  1  | 28800 (4)
   763                              <1> 	;		1    1    0  | 57600 (2)
   764                              <1> 	;		1    1    1  | 115200 (1) 
   765                              <1> 	;
   766                              <1> 	; (COM1 base port address = 3F8h, COM1 Interrupt = IRQ 4)
   767                              <1> 	; (COM2 base port address = 2F8h, COM1 Interrupt = IRQ 3)
   768                              <1> 	;
   769                              <1> 	; ((Modified registers: EAX, ECX, EDX, EBX))
   770                              <1> 	;
   771 0000FBE7 66BAF803            <1> 	mov	dx, 3F8h
   772 0000FBEB BB[26590100]        <1> 	mov	ebx, com1p ; COM1 control byte offset
   773 0000FBF0 3C01                <1> 	cmp	al, 1
   774 0000FBF2 776B                <1> 	ja 	short sp_invp_err
   775 0000FBF4 7203                <1> 	jb	short sp_setp1 ;  COM1 (AL = 0)
   776 0000FBF6 FECE                <1> 	dec	dh ; 2F8h
   777 0000FBF8 43                  <1> 	inc	ebx ; COM2 control byte offset
   778                              <1> sp_setp1:
   779                              <1> 	; 29/10/2015
   780 0000FBF9 8823                <1> 	mov	[ebx], ah
   781 0000FBFB 0FB6CC              <1> 	movzx 	ecx, ah
   782 0000FBFE C0E905              <1> 	shr	cl, 5 ; -> baud rate index
   783 0000FC01 80E41F              <1> 	and	ah, 1Fh ; communication parameters except baud rate
   784 0000FC04 8A81[6EFC0000]      <1> 	mov	al, [ecx+b_div_tbl]
   785 0000FC0A 6689C1              <1> 	mov	cx, ax
   786 0000FC0D E896FFFFFF          <1> 	call	sp_i3
   787 0000FC12 6689C1              <1> 	mov	cx, ax ; CL = Line status, CH = Modem status
   788 0000FC15 A880                <1> 	test	al, 80h
   789 0000FC17 740F                <1> 	jz	short sp_setp2
   790 0000FC19 C603E3              <1>         mov     byte [ebx], 0E3h ; Reset to initial value (11100011b)
   791                              <1> stp_dnr_err:
   792 0000FC1C C705[C8030300]0F00- <1> 	mov	dword [u.error], ERR_DEV_NOT_RDY ; 'device not ready !'
   792 0000FC24 0000                <1>
   793                              <1> 	; CL = Line status, CH = Modem status
   794 0000FC26 F9                  <1> 	stc
   795 0000FC27 C3                  <1> 	retn
   796                              <1> sp_setp2:
   797 0000FC28 80FE02              <1> 	cmp	dh, 2 ; COM2 (2F?h)
   798 0000FC2B 0F8649FFFFFF        <1>         jna     sp_i6 
   799                              <1> 		      ; COM1 (3F?h)
   800                              <1> sp_i5: 
   801                              <1> 	; 07/11/2015
   802                              <1> 	; 26/10/2015
   803                              <1> 	; 29/06/2015
   804                              <1> 	;
   805                              <1> 	;; COM1 - enabling IRQ 4
   806 0000FC31 9C                  <1> 	pushf
   807 0000FC32 FA                  <1> 	cli
   808 0000FC33 66BAFC03            <1> 	mov	dx, 3FCh   		; modem control register
   809 0000FC37 EC                  <1> 	in	al, dx 	   		; read register
   810 0000FC38 EB00                <1> 	JMP	$+2			; I/O DELAY
   811 0000FC3A 0C08                <1> 	or	al, 8      		; enable bit 3 (OUT2)
   812 0000FC3C EE                  <1> 	out	dx, al     		; write back to register
   813 0000FC3D EB00                <1> 	JMP	$+2			; I/O DELAY
   814 0000FC3F 66BAF903            <1> 	mov	dx, 3F9h   		; interrupt enable register
   815 0000FC43 EC                  <1> 	in	al, dx     		; read register
   816 0000FC44 EB00                <1> 	JMP	$+2			; I/O DELAY
   817                              <1> 	;or	al, 1      		; receiver data interrupt enable and
   818 0000FC46 0C03                <1> 	or	al, 3	   		; transmitter empty interrupt enable
   819 0000FC48 EE                  <1> 	out	dx, al 	   		; write back to register
   820 0000FC49 EB00                <1> 	JMP	$+2        		; I/O DELAY
   821 0000FC4B E421                <1> 	in	al, 21h    		; read interrupt mask register
   822 0000FC4D EB00                <1> 	JMP	$+2			; I/O DELAY
   823 0000FC4F 24EF                <1> 	and	al, 0EFh   		; enable IRQ 4 (COM1)
   824 0000FC51 E621                <1> 	out	21h, al    		; write back to register
   825                              <1> 	;
   826                              <1> 	; 23/10/2015
   827 0000FC53 B8[63FA0000]        <1> 	mov 	eax, com1_int
   828 0000FC58 A3[75FC0000]        <1> 	mov	[com1_irq4], eax
   829                              <1> 	; 26/10/2015
   830 0000FC5D 9D                  <1> 	popf
   831 0000FC5E C3                  <1> 	retn
   832                              <1> 
   833                              <1> sp_invp_err:
   834 0000FC5F C705[C8030300]1700- <1> 	mov	dword [u.error], ERR_INV_PARAMETER ; 'invalid parameter !' 
   834 0000FC67 0000                <1>
   835 0000FC69 31C9                <1> 	xor	ecx, ecx
   836 0000FC6B 49                  <1> 	dec	ecx ; 0FFFFh
   837 0000FC6C F9                  <1> 	stc
   838 0000FC6D C3                  <1> 	retn
   839                              <1> 
   840                              <1> ; 29/10/2015
   841                              <1> b_div_tbl: ; Baud rate divisor table (115200/divisor)
   842 0000FC6E 010C0603080401      <1> 	db 1, 12, 6, 3, 8, 4, 1
   843                              <1> 
   844                              <1> 
   845                              <1> ; 23/10/2015
   846                              <1> com1_irq4:
   847 0000FC75 [7DFC0000]          <1> 	dd dummy_retn
   848                              <1> com2_irq3:
   849 0000FC79 [7DFC0000]          <1> 	dd dummy_retn
   850                              <1> 
   851                              <1> dummy_retn:
   852 0000FC7D C3                  <1> 	retn
   853                              <1> 
   854                              <1> wakeup:
   855                              <1> 	; 24/01/2016
   856 0000FC7E C3                  <1> 	retn
   857                              <1> 
   858                              <1> set_working_path_x:
   859                              <1> 		; 17/10/2016 (TRDOS 386 - FFF & FNF)
   860 0000FC7F 66B80100            <1> 		mov	ax, 1 
   861                              <1> 			; File name is needed/forced (AL=1)
   862                              <1> 			; Change directory as temporary (AH=0)	
   863                              <1> 
   864                              <1> set_working_path_xx: ; 30/12/2017 (syschdir)
   865                              <1> 		; This is needed for preventing wrong Find Next File
   866                              <1> 		; system call after sysopen, syscreate, sysmkdir etc. 
   867                              <1> 		; Find Next File must immediate follow Find First File)
   868                              <1> 
   869 0000FC83 8825[74650100]      <1> 		mov	[FFF_Valid], ah ; 0 ; reset ; 17/10/2016
   870                              <1> 
   871                              <1> set_working_path:
   872                              <1> 		; 16/10/2016
   873                              <1> 		; 12/10/2016
   874                              <1> 		; 10/10/2016
   875                              <1> 		; 05/10/2016 - TRDOS 386 (TRDOS v2.0)
   876                              <1> 		;
   877                              <1> 		; TRDOS v1.0 (DIR.ASM, "proc_set_working_path")
   878                              <1>                 ; 27/01/2011 - 08/02/2011 
   879                              <1> 		; Set/Changes current drive, directory and file
   880                              <1> 		; depending on command tail
   881                              <1> 		; (procedure is derivated from CMD_INTR.ASM 
   882                              <1> 		; file or dir locating code of internal commands)
   883                              <1> 		; (This procedure is prepared for INT 21H file/dir 
   884                              <1> 		; functions and also to get compact code for 
   885                              <1> 		; internal mainprog -command interpreter- commands)
   886                              <1> 		; 
   887                              <1> 		; INPUT: DS:SI -> Command tail (ASCIIZ string)
   888                              <1> 		; AL = 0 -> any, AL > 0 -> file name is forced
   889                              <1> 		; AH = CD -> Change directory permanently 
   890                              <1> 		; AH <> CD -> Change directory as temporary    
   891                              <1> 		; 
   892                              <1> 		; OUTPUT: ES=DS, FindFile structure has been set
   893                              <1> 		;        RUN_CDRV points previous current drive  
   894                              <1> 		;        DS:SI = FindFile structure address
   895                              <1> 		;        (DS=CS)       
   896                              <1> 		;        AX, BX, CX, DX, DI will be changed
   897                              <1> 		;   cf = 1 -> Error code in AX (AL)
   898                              <1> 		;        stc & AX = 0 -> Bad command or path name 
   899                              <1> 		; -----------------------------------------------
   900                              <1> 		;
   901                              <1> 		; TRDOS 386 (05/10/2016)
   902                              <1> 		; INPUT:
   903                              <1> 		;	ESI = File/Directory Path (ASCIIZ string)
   904                              <1> 		;             address in user's memory space
   905                              <1> 		;       AL = 0 -> any
   906                              <1> 		;       AL > 0 -> file name is forced
   907                              <1> 		;       AH = CD -> change directory as permanent
   908                              <1> 		;       AH <> CD -> change directory as temporary
   909                              <1> 		; 
   910                              <1> 		; OUTPUT:
   911                              <1> 		;	FindFile structure has been set
   912                              <1> 		;       RUN_CDRV points previous current drive  
   913                              <1> 		;       ESI = FindFile_Name address ; 12/10/2016
   914                              <1> 		;
   915                              <1> 		;       cf = 1 -> Error code in EAX (AL)
   916                              <1> 		;       stc & EAX = 0 -> Bad command or path name
   917                              <1> 		;  
   918                              <1> 		; Modified registers: EAX, EBX, ECX, EDX, ESI, EDI
   919                              <1> 
   920 0000FC89 66A3[78650100]      <1> 		mov	[SWP_Mode], ax
   921 0000FC8F A0[86590100]        <1> 		mov	al, [Current_Drv]
   922 0000FC94 30E4                <1> 		xor	ah, ah
   923 0000FC96 66A3[7A650100]      <1> 		mov	[SWP_DRV], ax
   924                              <1> 
   925                              <1> 		; TRDOS 386 ring 3 (user's page directory)
   926                              <1> 		; to ring 0 (kernel's page directory) 
   927                              <1> 		; transfer modifications (05/10/2016).
   928                              <1> 
   929 0000FC9C 55                  <1> 		push	ebp
   930 0000FC9D 89E5                <1> 		mov	ebp, esp
   931                              <1> 		
   932 0000FC9F B980000000          <1> 		mov	ecx, 128 ; maximum path length = 128 bytes
   933 0000FCA4 29CC                <1> 		sub	esp, ecx ; reserve 128 bytes (buffer) on stack
   934 0000FCA6 89E7                <1> 		mov	edi, esp ; destination address (kernel space)
   935                              <1> 		; esi = source address (virtual, in user's memory space)
   936 0000FCA8 E89AEBFFFF          <1> 		call	transfer_from_user_buffer
   937 0000FCAD 720A                <1> 		jc	short loc_swp_xor_retn 
   938                              <1> 		
   939 0000FCAF 89E6                <1> 		mov	esi, esp ; temporary buffer (the path) on stack
   940                              <1> loc_swp_fchar:
   941 0000FCB1 8A06                <1> 		mov	al, [esi]
   942 0000FCB3 3C20                <1> 		cmp	al, 20h
   943 0000FCB5 7711                <1> 		ja	short loc_swp_parse_path_name
   944 0000FCB7 740C                <1> 		je	short loc_swp_fchar_next
   945                              <1> 
   946                              <1> loc_swp_xor_retn:
   947 0000FCB9 31C0                <1> 		xor	eax, eax
   948 0000FCBB F9                  <1> 		stc
   949                              <1> loc_swp_retn:
   950 0000FCBC 89EC                <1> 		mov	esp, ebp
   951 0000FCBE 5D                  <1> 		pop	ebp
   952                              <1> 
   953                              <1> 		;mov	esi, FindFile_Drv
   954 0000FCBF BE[68620100]        <1> 		mov	esi, FindFile_Name ; 12/10/2016
   955 0000FCC4 C3                  <1> 		retn 
   956                              <1> 
   957                              <1> loc_swp_fchar_next:
   958 0000FCC5 46                  <1> 		inc	esi
   959 0000FCC6 EBE9                <1> 		jmp	short loc_swp_fchar  
   960                              <1> 
   961                              <1> loc_swp_parse_path_name:
   962 0000FCC8 BF[26620100]        <1> 		mov	edi, FindFile_Drv
   963 0000FCCD E8E6A7FFFF          <1> 		call	parse_path_name
   964 0000FCD2 72E8                <1> 		jc	short loc_swp_retn
   965                              <1> 
   966                              <1> loc_swp_checkfile_name:
   967 0000FCD4 803D[78650100]00    <1> 		cmp	byte [SWP_Mode], 0
   968 0000FCDB 761E                <1> 		jna	short loc_swp_drv
   969                              <1> 
   970                              <1> 		; 10/10/2016 (valid file name checking)
   971 0000FCDD BE[68620100]        <1> 		mov	esi, FindFile_Name
   972 0000FCE2 803E20              <1> 		cmp	byte [esi], 20h
   973 0000FCE5 76D2                <1> 		jna	short loc_swp_xor_retn
   974                              <1> 
   975                              <1> 		; 16/10/2016
   976 0000FCE7 C605[77650100]00    <1> 		mov	byte [SWP_inv_fname], 0 ; reset 
   977                              <1> 		; esi = file name address (ASCIIZ)
   978 0000FCEE E8B289FFFF          <1> 		call	check_filename
   979 0000FCF3 7306                <1> 		jnc	short loc_swp_drv
   980                              <1> 
   981 0000FCF5 FE05[77650100]      <1> 		inc	byte [SWP_inv_fname] ; set 	
   982                              <1> loc_swp_drv:
   983 0000FCFB 8A35[86590100]      <1> 		mov	dh, [Current_Drv]
   984                              <1>                ;mov	[RUN_CDRV], dh
   985                              <1> 
   986 0000FD01 8A15[26620100]      <1> 		mov	dl, [FindFile_Drv]
   987                              <1>                ;cmp	dl, dh
   988 0000FD07 3A15[86590100]      <1> 		cmp	dl, [Current_Drv]
   989 0000FD0D 740D                <1> 		je	short loc_swp_change_directory
   990                              <1> 
   991 0000FD0F FE05[7B650100]      <1> 		inc	byte [SWP_DRV_chg]
   992 0000FD15 E82A72FFFF          <1> 		call	change_current_drive
   993 0000FD1A 72A0                <1> 		jc	short loc_swp_retn ; eax = error code
   994                              <1> 		; eax = 0
   995                              <1> 
   996                              <1> loc_swp_change_directory:
   997 0000FD1C 803D[27620100]21    <1> 		cmp	byte [FindFile_Directory], 21h
   998 0000FD23 F5                  <1> 		cmc
   999 0000FD24 7396                <1> 		jnc	short loc_swp_retn
  1000                              <1> 
  1001 0000FD26 FE05[7B650100]      <1> 		inc	byte [SWP_DRV_chg]
  1002 0000FD2C FE05[620D0100]      <1> 		inc	byte [Restore_CDIR]
  1003 0000FD32 BE[27620100]        <1> 		mov	esi, FindFile_Directory
  1004 0000FD37 8A25[79650100]      <1> 		mov	ah, [SWP_Mode+1] 
  1005 0000FD3D E860A1FFFF          <1> 		call	change_current_directory
  1006 0000FD42 0F8274FFFFFF        <1> 		jc	loc_swp_retn ; eax = error code
  1007                              <1> 
  1008                              <1> loc_swp_change_prompt_dir_string:
  1009                              <1> 		; esi = PATH_Array
  1010                              <1> 		; eax = Current Directory First Cluster
  1011                              <1> 		; edi = Logical DOS Drive Description Table	
  1012 0000FD48 E87AA0FFFF          <1> 		call	change_prompt_dir_str 
  1013 0000FD4D 29C0                <1> 		sub	eax, eax ; 0
  1014 0000FD4F E968FFFFFF          <1> 		jmp	loc_swp_retn 
  1015                              <1> 
  1016                              <1> reset_working_path:
  1017                              <1> 		; 06/10/2016 - TRDOS 386 (TRDOS v2.0)
  1018                              <1> 		;
  1019                              <1> 		; TRDOS v1.0 (DIR.ASM, "proc_reset_working_path")
  1020                              <1> 		; 05/02/2011 - 08/02/2011 
  1021                              <1> 		;
  1022                              <1> 		; Restores current drive and directory 
  1023                              <1> 		; 
  1024                              <1> 		; INPUT: none
  1025                              <1> 		; OUTPUT: DL = SWP_DRV, EAX = 0 -> OK
  1026                              <1> 		;
  1027                              <1> 		;    AX = 0 -> ESI = Logical Dos Drv Desc. Table
  1028                              <1> 		;
  1029                              <1> 		;    EAX, EBX, ECX, EDX, ESI, EDI will be changed
  1030                              <1> 		;
  1031                              <1> 
  1032                              <1>   
  1033 0000FD54 31C0                <1> 		xor	eax, eax
  1034 0000FD56 48                  <1> 		dec	eax 
  1035                              <1> 
  1036 0000FD57 668B15[7A650100]    <1> 		mov	dx, [SWP_DRV]
  1037 0000FD5E 08F6                <1> 		or	dh, dh
  1038 0000FD60 742E                <1> 		jz	short loc_rwp_return
  1039                              <1> 
  1040 0000FD62 3A15[86590100]      <1> 		cmp	dl, [Current_Drv]
  1041 0000FD68 7407                <1> 		je	short loc_rwp_restore_cdir
  1042                              <1> loc_rwp_restore_cdrv:
  1043 0000FD6A E8D571FFFF          <1> 		call	change_current_drive 
  1044 0000FD6F EB10                <1> 		jmp	short loc_rwp_restore_ok
  1045                              <1> loc_rwp_restore_cdir:
  1046 0000FD71 31DB                <1> 		xor	ebx, ebx
  1047 0000FD73 88D7                <1> 		mov	bh, dl
  1048 0000FD75 BE00010900          <1> 		mov	esi, Logical_DOSDisks
  1049 0000FD7A 01DE                <1> 		add	esi, ebx
  1050                              <1> 
  1051 0000FD7C E87A72FFFF          <1> 		call	restore_current_directory
  1052                              <1> 
  1053                              <1> loc_rwp_restore_ok:
  1054 0000FD81 668B15[7A650100]    <1> 		mov	dx, [SWP_DRV]
  1055 0000FD88 31C0                <1> 		xor	eax, eax  
  1056 0000FD8A 66A3[7B650100]      <1> 		mov	[SWP_DRV_chg], ax
  1057                              <1> loc_rwp_return:
  1058 0000FD90 C3                  <1> 		retn
  1059                              <1> 
  1060                              <1> get_file_name:
  1061                              <1> 		; 15/10/2016 - TRDOS 386 (TRDOS v2.0)
  1062                              <1> 		; Convert file name 
  1063                              <1> 		;	from directory entry format
  1064                              <1>                 ; 	to (8.3) dot file name format 
  1065                              <1> 		;
  1066                              <1> 		; TRDOS v1.0 (DIR.ASM, "get_file_name")
  1067                              <1>                 ; 2005 - 09/10/2011 	
  1068                              <1> 		; INPUT: 
  1069                              <1> 		;	DS:SI -> Directory Entry Format File Name
  1070                              <1> 		;       ES:DI -> DOS Dot File Name Address
  1071                              <1> 		; OUTPUT:
  1072                              <1> 		;	DS:SI -> DOS Dot File Name Address
  1073                              <1>                 ;	ES:DI -> Directory Entry Format File Name
  1074                              <1> 		;	
  1075                              <1> 		; TRDOS 386 (15/10/2016)
  1076                              <1> 		; INPUT:
  1077                              <1> 		;	ESI = File name addr in dir entry format
  1078                              <1> 		;	EDI = Dot file name address (destination)
  1079                              <1> 		; OUTPUT: 
  1080                              <1> 		;	File name is converted and moved
  1081                              <1> 		;	to destination (as 8.3 dot filename)
  1082                              <1> 		;  
  1083                              <1> 		; Modified registers: EAX, ECX
  1084                              <1> 
  1085                              <1>                 ; 2005 (TRDOS 8086) - 2016 (TRDOS 386)
  1086                              <1>                             
  1087 0000FD91 57                  <1> 		push	edi
  1088 0000FD92 56                  <1> 		push	esi
  1089 0000FD93 AC                  <1> 		lodsb
  1090 0000FD94 3C20                <1> 		cmp	al, 20h
  1091 0000FD96 762A                <1> 		jna	short pass_gfn_ext
  1092 0000FD98 56                  <1> 		push	esi
  1093 0000FD99 AA                  <1> 		stosb
  1094 0000FD9A B907000000          <1> 		mov	ecx, 7
  1095                              <1> loc_gfn_next_char:
  1096 0000FD9F AC                  <1> 		lodsb
  1097 0000FDA0 3C20                <1> 		cmp	al, 20h
  1098 0000FDA2 7603                <1> 		jna	short pass_gfn_fn
  1099 0000FDA4 AA                  <1> 		stosb
  1100 0000FDA5 E2F8                <1> 		loop	loc_gfn_next_char
  1101                              <1> pass_gfn_fn:
  1102 0000FDA7 5E                  <1> 		pop	esi
  1103 0000FDA8 83C607              <1> 		add	esi, 7
  1104 0000FDAB AC                  <1> 		lodsb
  1105 0000FDAC 3C20                <1> 		cmp	al, 20h
  1106 0000FDAE 7612                <1> 		jna	short pass_gfn_ext
  1107 0000FDB0 B42E                <1> 		mov	ah, '.'
  1108 0000FDB2 86E0                <1> 		xchg	ah, al
  1109 0000FDB4 66AB                <1> 		stosw
  1110 0000FDB6 AC                  <1> 		lodsb
  1111 0000FDB7 3C20                <1> 		cmp	al, 20h
  1112 0000FDB9 7607                <1> 		jna	short pass_gfn_ext
  1113 0000FDBB AA                  <1> 		stosb
  1114 0000FDBC AC                  <1> 		lodsb
  1115 0000FDBD 3C20                <1> 		cmp	al, 20h
  1116 0000FDBF 7601                <1> 		jna	short pass_gfn_ext
  1117 0000FDC1 AA                  <1> 		stosb
  1118                              <1> pass_gfn_ext:		
  1119 0000FDC2 30C0                <1> 		xor	al, al
  1120 0000FDC4 AA                  <1> 		stosb
  1121 0000FDC5 5E                  <1> 		pop	esi
  1122 0000FDC6 5F                  <1> 		pop	edi
  1123 0000FDC7 C3                  <1> 		retn
  1124                              <1> 
  1125                              <1> set_hardware_int_vector:
  1126                              <1> 		; 18/03/2017
  1127                              <1> 		; 03/03/2017
  1128                              <1> 		; 28/02/2017 - TRDOS 386 (TRDOS v2.0)
  1129                              <1> 		;
  1130                              <1> 		; SET/RESET HARDWARE INTERRUPT GATE
  1131                              <1> 		;
  1132                              <1> 		; Changes interrupt gate descriptor table
  1133                              <1> 		; (without changing default interrupt list)
  1134                              <1> 		;
  1135                              <1> 		; INPUT:
  1136                              <1> 		;	AL = IRQ number (0 to 15)
  1137                              <1> 		;	AH > 0 -> set
  1138                              <1> 		;	AH = 0 -> reset
  1139                              <1> 		;	
  1140                              <1> 		; Modified registers: eax, ebx, edx, edi 
  1141                              <1> 		;
  1142                              <1> 		
  1143 0000FDC8 C0E002              <1> 		shl	al, 2 ; IRQ number * 4
  1144 0000FDCB 0FB6D8              <1> 		movzx	ebx, al
  1145                              <1> 
  1146 0000FDCE 08E4                <1> 		or	ah, ah
  1147 0000FDD0 7508                <1> 		jnz	short shintv_1 ; set (for user call service)
  1148                              <1> 		
  1149                              <1> 		; 18/03/2017
  1150 0000FDD2 81C3[60170100]      <1> 		add	ebx, IRQ_list ; reset to default interrupt list
  1151 0000FDD8 EB06                <1> 		jmp	short shintv_2
  1152                              <1> shintv_1:
  1153 0000FDDA 81C3[01FE0000]      <1> 		add	ebx, IRQ_u_list
  1154                              <1> shintv_2:	
  1155 0000FDE0 8B13                <1> 		mov	edx, [ebx] ; IRQ handler address
  1156                              <1> 		
  1157                              <1> 		; 03/03/2017
  1158 0000FDE2 D0E0                <1> 		shl	al, 1 ; IRQ number * 8 
  1159                              <1> 		; 18/03/2017
  1160 0000FDE4 0FB6F8              <1> 		movzx	edi, al 
  1161 0000FDE7 81C7[D8560100]      <1> 		add	edi, idt + (8*32) ; IRQ 0 offset = idt + 256
  1162                              <1> 		
  1163 0000FDED 89D0                <1> 		mov	eax, edx ; IRQ handler address
  1164 0000FDEF BB00000800          <1> 		mov	ebx, 80000h
  1165                              <1> 
  1166                              <1> 		;mov	edx, eax
  1167 0000FDF4 66BA008E            <1> 		mov	dx, 8E00h
  1168 0000FDF8 6689C3              <1> 		mov	bx, ax
  1169 0000FDFB 89D8                <1> 		mov	eax, ebx ; /* selector = 0x0008 = cs */
  1170                              <1>        			         ; /* interrupt gate - dpl=0, present */
  1171 0000FDFD AB                  <1> 		stosd	; selector & offset bits 0-15 	
  1172 0000FDFE 8917                <1> 		mov	[edi], edx ; attributes & offset bits 16-23
  1173                              <1> 
  1174 0000FE00 C3                  <1> 		retn
  1175                              <1> IRQ_u_list:
  1176                              <1> 		; 28/02/2017
  1177 0000FE01 [94060000]          <1> 		dd	timer_int
  1178 0000FE05 [080E0000]          <1> 		dd	kb_int
  1179 0000FE09 [76080000]          <1> 		dd	irq2
  1180 0000FE0D [41FE0000]          <1> 		dd	IRQ_service3
  1181 0000FE11 [4BFE0000]          <1> 		dd	IRQ_service4
  1182 0000FE15 [55FE0000]          <1> 		dd	IRQ_service5
  1183 0000FE19 [D7410000]          <1> 		dd	fdc_int	
  1184 0000FE1D [5FFE0000]          <1> 		dd	IRQ_service7
  1185 0000FE21 [FF070000]          <1> 		dd	rtc_int
  1186 0000FE25 [69FE0000]          <1> 		dd	IRQ_service9
  1187 0000FE29 [73FE0000]          <1> 		dd	IRQ_service10
  1188 0000FE2D [7DFE0000]          <1> 		dd	IRQ_service11
  1189 0000FE31 [87FE0000]          <1> 		dd	IRQ_service12
  1190 0000FE35 [91FE0000]          <1> 		dd	IRQ_service13
  1191 0000FE39 [8A4B0000]          <1> 		dd	hdc1_int
  1192 0000FE3D [B14B0000]          <1> 		dd	hdc2_int
  1193                              <1> 
  1194                              <1> 		; 03/03/2017
  1195                              <1> 		; 27/02/2017
  1196                              <1> IRQ_service3:
  1197 0000FE41 36C605[3E6B0100]03  <1> 		mov	byte [ss:IRQnum], 3
  1198 0000FE49 EB4E                <1> 		jmp	short IRQ_service
  1199                              <1> IRQ_service4:
  1200 0000FE4B 36C605[3E6B0100]04  <1> 		mov	byte [ss:IRQnum], 4
  1201 0000FE53 EB44                <1> 		jmp	short IRQ_service
  1202                              <1> IRQ_service5:
  1203 0000FE55 36C605[3E6B0100]05  <1> 		mov	byte [ss:IRQnum], 5
  1204 0000FE5D EB3A                <1> 		jmp	short IRQ_service
  1205                              <1> IRQ_service7:
  1206 0000FE5F 36C605[3E6B0100]07  <1> 		mov	byte [ss:IRQnum], 7
  1207 0000FE67 EB30                <1> 		jmp	short IRQ_service
  1208                              <1> IRQ_service9:
  1209 0000FE69 36C605[3E6B0100]09  <1> 		mov	byte [ss:IRQnum], 9
  1210 0000FE71 EB26                <1> 		jmp	short IRQ_service
  1211                              <1> IRQ_service10:
  1212 0000FE73 36C605[3E6B0100]0A  <1> 		mov	byte [ss:IRQnum], 10
  1213 0000FE7B EB1C                <1> 		jmp	short IRQ_service
  1214                              <1> IRQ_service11:
  1215 0000FE7D 36C605[3E6B0100]0B  <1> 		mov	byte [ss:IRQnum], 11
  1216 0000FE85 EB12                <1> 		jmp	short IRQ_service
  1217                              <1> IRQ_service12:
  1218 0000FE87 36C605[3E6B0100]0C  <1> 		mov	byte [ss:IRQnum], 12
  1219 0000FE8F EB08                <1> 		jmp	short IRQ_service
  1220                              <1> IRQ_service13:
  1221 0000FE91 36C605[3E6B0100]0D  <1> 		mov	byte [ss:IRQnum], 13
  1222                              <1> 		;jmp	short IRQ_service
  1223                              <1> IRQ_service:
  1224                              <1> 		; 13/06/2017
  1225                              <1> 		; 11/06/2017
  1226                              <1> 		; 10/06/2017
  1227                              <1> 		; 01/03/2017, 04/03/2017
  1228                              <1> 		; 27/02/2017, 28/02/2017
  1229 0000FE99 1E                  <1> 		push	ds
  1230 0000FE9A 06                  <1> 		push	es
  1231 0000FE9B 0FA0                <1> 		push	fs
  1232 0000FE9D 0FA8                <1> 		push	gs
  1233                              <1> 
  1234 0000FE9F 60                  <1> 		pushad	; eax,ecx,edx,ebx,esp,ebp,esi,edi
  1235 0000FEA0 66B91000            <1> 		mov     cx, KDATA
  1236 0000FEA4 8ED9                <1>         	mov     ds, cx
  1237 0000FEA6 8EC1                <1>         	mov     es, cx
  1238 0000FEA8 8EE1                <1>         	mov     fs, cx
  1239 0000FEAA 8EE9                <1>         	mov     gs, cx
  1240                              <1> 
  1241 0000FEAC 0F20D8              <1> 		mov	eax, cr3
  1242 0000FEAF A3[3A6B0100]        <1> 		mov	[IRQ_cr3], eax
  1243                              <1> 
  1244 0000FEB4 A1[C0580100]        <1> 		mov	eax, [k_page_dir]
  1245 0000FEB9 0F22D8              <1> 		mov	cr3, eax 
  1246                              <1> 
  1247 0000FEBC A0[3E6B0100]        <1> 		mov	al, [IRQnum]
  1248                              <1> 
  1249                              <1> 		;mov	cl, [sysflg]
  1250                              <1> 		;mov	[u.r_mode], cl  ; system (0) or user mode (FFh) 
  1251                              <1> IRQsrv_0:
  1252 0000FEC1 0FB6D8              <1> 		movzx	ebx, al
  1253 0000FEC4 8A9B[96160100]      <1> 		mov	bl, [ebx+IRQenum] ; IRQ (available) index number + 1
  1254                              <1> 		; 01/03/2017
  1255 0000FECA FECB                <1> 		dec	bl  ; IRQ index number, 0 to 8
  1256 0000FECC 0F8807010000        <1> 		js	IRQsrv_5 ; not available to use here!?
  1257                              <1> 		;		 
  1258 0000FED2 80BB[046B0100]80    <1> 		cmp	byte [ebx+IRQ.method], 80h ; using by a dev or kernel? 
  1259 0000FED9 7205                <1> 		jb	short IRQsrv_1 ; no
  1260                              <1> 
  1261                              <1> 		; If the IRQ service is already owned by TRDOS 386 kernel
  1262                              <1> 		;	 or a Device driver
  1263                              <1> 		; we need to call 'dev_IRQ_service'
  1264                              <1> 
  1265                              <1> 		; IRQ number in AL
  1266 0000FEDB E866020000          <1> 		call	dev_IRQ_service	 ; IRQ service for device drivers	
  1267                              <1> 		; IRQ number in AL
  1268                              <1> IRQsrv_1:		
  1269                              <1> 		; check user callback service status
  1270                              <1> 		; AL = IRQ number
  1271                              <1> 		; EBX = IRQ (Available) Index number
  1272                              <1> 
  1273 0000FEE0 A2[D7030300]        <1> 		mov	[u.irqwait], al ; set waiting IRQ flag
  1274                              <1> 
  1275 0000FEE5 8A83[F26A0100]      <1> 		mov	al, [ebx+IRQ.owner]
  1276 0000FEEB 20C0                <1> 		and	al, al
  1277 0000FEED 0F84E6000000        <1> 		jz	IRQsrv_5 ; it is not owned by a user/proc
  1278                              <1> 
  1279                              <1> 		; 03/03/2017
  1280 0000FEF3 89DA                <1> 		mov	edx, ebx
  1281 0000FEF5 C0E202              <1> 		shl	dl, 2
  1282 0000FEF8 8B92[166B0100]      <1> 		mov	edx, [edx+IRQ.addr] ; S.R.B. or Callback service addr
  1283                              <1> 		
  1284 0000FEFE 8AA3[046B0100]      <1> 		mov	ah, [ebx+IRQ.method]
  1285 0000FF04 F6C401              <1> 		test	ah, 1
  1286 0000FF07 7534                <1> 		jnz	short IRQsrv_4 ; Callback service method
  1287                              <1> 
  1288                              <1> 		; Signal Response Byte method
  1289                              <1> 		;mov	edx, [edx+IRQ.addr] ; Signal Response Byte address
  1290                              <1> 		;			    ; (Physical address, non-swappable) 	
  1291 0000FF09 80E402              <1> 		and	ah, 2 ; bit 1, (S.R.B.) counter (auto increment) method
  1292 0000FF0C 8AA3[0D6B0100]      <1> 		mov	ah, [ebx+IRQ.srb] ; Signal Response Byte value
  1293 0000FF12 7408                <1> 		jz	short IRQsrv_2 ; fixed S.R.B. value
  1294                              <1> 		; counter method (auto increment)
  1295 0000FF14 FEC4                <1> 		inc	ah
  1296 0000FF16 88A3[0D6B0100]      <1> 		mov	[ebx+IRQ.srb], ah ; next (count) number
  1297                              <1> IRQsrv_2:
  1298 0000FF1C 8822                <1> 		mov	[edx], ah ; put S.R.B. val to the user's S.R.B. addr
  1299 0000FF1E C605[D7030300]00    <1> 		mov	byte [u.irqwait], 0 ; clear waiting IRQ flag
  1300                              <1> 
  1301 0000FF25 3A05[B3030300]      <1> 		cmp	al, [u.uno]
  1302 0000FF2B 0F84A8000000        <1> 		je	IRQsrv_5 ; the owner is current user/process
  1303                              <1> IRQsrv_3:
  1304                              <1> 		; the owner is not current user/process
  1305                              <1> 		; AL = process number
  1306 0000FF31 B202                <1> 		mov	dl, 2 ; priority, 2 = event (high)	
  1307 0000FF33 E837FAFFFF          <1> 		call	set_run_sequence
  1308                              <1> 
  1309                              <1> 		; [u.irqwait] = waiting IRQ number for callback service
  1310                              <1> 
  1311 0000FF38 E99C000000          <1> 		jmp	IRQsrv_5
  1312                              <1> IRQsrv_4:
  1313 0000FF3D 3A05[B3030300]      <1> 		cmp	al, [u.uno]  ; is the owner is current user/process?
  1314 0000FF43 75EC                <1> 		jne	short IRQsrv_3 ; no !
  1315                              <1> 
  1316                              <1> 		; Check if an IRQ callback service already in progress
  1317 0000FF45 803D[D8030300]00    <1> 		cmp	byte [u.r_lock], 0
  1318 0000FF4C 0F8787000000        <1> 		ja	IRQsrv_5 ; nothing to do !  
  1319                              <1> 				     ; (we need to complete prev callback)
  1320 0000FF52 803D[D4030300]00    <1> 		cmp	byte [u.t_lock], 0
  1321 0000FF59 777E                <1> 		ja	short IRQsrv_5 ; nothing to do !  
  1322                              <1> 				     ; (we need to complete timer callback)
  1323                              <1> 
  1324                              <1> 		; 04/03/2017
  1325 0000FF5B C605[D7030300]00    <1> 		mov	byte [u.irqwait], 0 ; reset/clear waiting IRQ flag
  1326                              <1> 
  1327 0000FF62 FE05[D8030300]      <1> 		inc	byte [u.r_lock] ; 'IRQ callback service in progress' flag
  1328                              <1> 
  1329 0000FF68 8A0D[5B030300]      <1> 		mov	cl, [sysflg]   ; (system call) mode flag (kernel/user)
  1330 0000FF6E 880D[D9030300]      <1> 		mov	[u.r_mode], cl ; system mode (0) or user mode (FFh)
  1331                              <1> 
  1332                              <1> 		; 
  1333 0000FF74 8B2D[5C580100]      <1> 		mov	ebp, [tss.esp0] ; kernel stack address (for ring 0)
  1334 0000FF7A 83ED14              <1> 		sub	ebp, 20		; eip, cs, eflags, esp, ss
  1335 0000FF7D 892D[5C030300]      <1> 	 	mov	[u.sp], ebp
  1336 0000FF83 8925[60030300]      <1> 		mov	[u.usp], esp
  1337                              <1> 
  1338                              <1> 		;or	word [ebp+8], 200h ; 22/01/2017, force enabling interrupts
  1339                              <1> 
  1340 0000FF89 8B44241C            <1> 		mov	eax, [esp+28] ; pushed eax
  1341 0000FF8D A3[64030300]        <1> 		mov	[u.r0], eax
  1342                              <1> 
  1343 0000FF92 E81AE7FFFF          <1> 		call	wswap ; save user's registers & status
  1344                              <1> 
  1345                              <1> 		; software int is in ring 0 but IRQ handler must return to ring 3
  1346                              <1> 		; so, ring 3 return address and stack registers
  1347                              <1> 		; (eip, cs, eflags, esp, ss) 
  1348                              <1> 		; must be copied to IRQ handler return
  1349                              <1> 		; eip will be replaced by callback service routine address
  1350                              <1> 
  1351 0000FF97 C605[5B030300]FF    <1> 		mov	byte [sysflg], 0FFh ; user mode
  1352                              <1> 
  1353                              <1> 		; system mode (system call)
  1354                              <1> 		;mov	ebp, [u.sp] ; EIP (u), CS (UCODE), EFLAGS (u),
  1355                              <1> 				    ; ESP (u), SS (UDATA)
  1356                              <1> 
  1357 0000FF9E 8B4510              <1> 		mov	eax, [ebp+16]	; SS (UDATA)
  1358 0000FFA1 89E6                <1> 		mov	esi, esp
  1359 0000FFA3 50                  <1> 		push	eax
  1360 0000FFA4 50                  <1> 		push	eax
  1361 0000FFA5 89E7                <1> 		mov	edi, esp
  1362 0000FFA7 893D[60030300]      <1> 		mov	[u.usp], edi
  1363 0000FFAD B908000000          <1> 		mov	ecx, ((ESPACE/4) - 4) ; except DS, ES, FS, GS
  1364 0000FFB2 F3A5                <1> 		rep	movsd
  1365 0000FFB4 B104                <1> 		mov	cl, 4	
  1366 0000FFB6 F3AB                <1> 		rep	stosd
  1367 0000FFB8 893D[5C030300]      <1> 		mov	[u.sp], edi
  1368 0000FFBE 89EE                <1> 		mov	esi, ebp
  1369 0000FFC0 B105                <1> 		mov	cl, 5 ; EIP (u), CS (UCODE), EFLAGS (u), ESP (u), SS (UDATA)
  1370 0000FFC2 F3A5                <1> 		rep	movsd
  1371                              <1> 		;
  1372                              <1> 
  1373 0000FFC4 8B0D[B8030300]      <1> 		mov	ecx, [u.pgdir]
  1374 0000FFCA 890D[3A6B0100]      <1> 		mov	[IRQ_cr3], ecx
  1375                              <1> 
  1376                              <1> set_IRQ_callback_addr:
  1377                              <1> 		;
  1378                              <1> 		; This routine sets return address
  1379                              <1> 		; to start of user's interrupt
  1380                              <1> 		; service (callback) address
  1381                              <1> 		;
  1382                              <1> 		; INPUT:
  1383                              <1> 		;	EDX = callback routine/service address
  1384                              <1> 		;	      (virtual, not physical address!)	
  1385                              <1> 		;	[u.sp] = kernel stack, points to
  1386                              <1> 		;		 user's EIP,CS,EFLAGS,ESP,SS
  1387                              <1> 		;		 registers.
  1388                              <1> 		; OUTPUT:
  1389                              <1> 		;	EIP (user) = callback (service) address
  1390                              <1> 		;	CS (user) = UCODE
  1391                              <1> 		;	EFLAGS (user) = flags before callback 	 
  1392                              <1> 		;       ESP (user) = ESP-4 (user, before callback) 
  1393                              <1> 		;	[ESP](user) = EIP (user) before callback
  1394                              <1> 		;
  1395                              <1> 		; Note: If CPU was in user mode while entering 
  1396                              <1> 		;	the timer interrupt service routine,
  1397                              <1> 		;	'IRET' will get return to callback routine
  1398                              <1> 		;	immediately. If CPU was in system/kernel mode  
  1399                              <1> 		;	'iret' will get return to system call and
  1400                              <1> 		;	then, callback routine will be return address
  1401                              <1> 		;	from system call. (User's callback/service code
  1402                              <1> 		;	will be able to return to normal return address
  1403                              <1> 		;	via a 'sysrele' system call at the end.) 
  1404                              <1> 		;
  1405                              <1> 		; Note: User's IRQ callback service code must be ended
  1406                              <1> 		;	with a 'sysrele' system call !
  1407                              <1> 		;
  1408                              <1> 		;	For example:
  1409                              <1> 		;
  1410                              <1> 		;	audio_IRQ_callback:
  1411                              <1> 		;	    ...	 
  1412                              <1> 		;	    <load DMA buffer with audio data>
  1413                              <1> 		;	    ...
  1414                              <1> 		;	    mov eax, 39 ; 'sysrele'
  1415                              <1> 		;	    int 40h ; TRDOS 386 system call (interrupt)		
  1416                              <1> 		;
  1417                              <1> 		
  1418                              <1> 		;mov	edx, [edx+IRQ.addr] ; Callback service address
  1419                              <1> 		;			    ; (Virtual address)
  1420                              <1> 		
  1421 0000FFD0 8B2D[5C030300]      <1> 		mov	ebp, [u.sp]; kernel's stack, points to EIP (user)
  1422 0000FFD6 895500              <1> 		mov	[ebp], edx
  1423                              <1> IRQsrv_5:
  1424                              <1> 		; EOI & return
  1425                              <1> 		; 01/08/2020
  1426                              <1> 		; 11/06/2017
  1427                              <1> 		; 10/06/2017 
  1428                              <1> 		;mov	al, [IRQnum]
  1429 0000FFD9 B020                <1> 		mov	al, 20h ; 01/08/2020
  1430 0000FFDB FA                  <1> 		cli
  1431                              <1> 		;cmp	al, 7
  1432 0000FFDC 803D[3E6B0100]07    <1> 		cmp	byte [IRQnum], 7 ; 01/08/2020	
  1433 0000FFE3 7602                <1> 		jna	short IRQsrv_6
  1434                              <1> 		;
  1435                              <1> 		;;mov	al, EOI	; end of interrupt
  1436                              <1> 		;mov	al, 20h ; 01/08/2020
  1437                              <1> 		;cli		; disable interrupts till stack cleared
  1438                              <1> 		;out	INTB00, al ; For controll2 #2
  1439 0000FFE5 E6A0                <1> 		out	0A0h, al
  1440                              <1> IRQsrv_6:
  1441                              <1> 		;mov	byte [IRQnum], 0 ; reset
  1442                              <1> 		;;mov	al, EOI	; end of interrupt
  1443                              <1> 		;mov	al, 20h ; 01/08/2020
  1444                              <1> 		;cli		; disable interrupts till stack cleared
  1445                              <1> 		;out	INTA00, al ; end of interrupt to 8259 - 1
  1446 0000FFE7 E620                <1> 		out	20h, al	
  1447                              <1> IRQsrv_7:	
  1448                              <1> 		;; 13/06/2017
  1449                              <1> 		;or	word [ebp+8], 200h ; force enabling interrupts
  1450                              <1> 		;
  1451 0000FFE9 8B0D[3A6B0100]      <1> 		mov 	ecx, [IRQ_cr3]	; previous content of cr3 register
  1452 0000FFEF 0F22D9              <1>  		mov	cr3, ecx	; restore cr3 register content
  1453                              <1> 		;
  1454 0000FFF2 61                  <1> 		popad ; edi,esi,ebp,(icrement esp by 4),ebx,edx,ecx,eax
  1455                              <1> 		;
  1456 0000FFF3 0FA9                <1> 		pop	gs
  1457 0000FFF5 0FA1                <1> 		pop	fs
  1458 0000FFF7 07                  <1> 		pop	es
  1459 0000FFF8 1F                  <1> 		pop	ds
  1460                              <1> 		;
  1461 0000FFF9 CF                  <1> 		iretd	; return from interrupt
  1462                              <1> 
  1463                              <1> get_device_number:
  1464                              <1> 		; 08/10/2016
  1465                              <1> 		; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1466                              <1> 		;
  1467                              <1> 		; This procedure compares name of requested
  1468                              <1> 		; device with kernel device names and
  1469                              <1> 		; installable device names. If names match, 
  1470                              <1> 		; the relevant device index (entry) number 
  1471                              <1> 		; will be returned the caller (sysopen) 
  1472                              <1> 		; for the requested device.
  1473                              <1> 		;
  1474                              <1> 		; NOTE: Installable device drivers must
  1475                              <1> 		; be loaded before using 'sysopen'
  1476                              <1> 		; (opendev) system call.
  1477                              <1> 		;
  1478                              <1> 		; INPUT:
  1479                              <1> 		;    ESI = device name address (ASCIIZ)
  1480                              <1> 		;         (in kernel's memory space)  
  1481                              <1>    		;    max name length = 8 without '/dev/')
  1482                              <1> 		;    Device name will be capitalized 
  1483                              <1> 		;    and if there is, '/dev/' will be
  1484                              <1> 		;    removed from name before comparising)
  1485                              <1> 		;
  1486                              <1> 		; OUTPUT:
  1487                              <1> 		;    cf = 0 -> 
  1488                              <1> 		;      EAX (AL) = device entry/index number 	 	
  1489                              <1> 		;    cf = 1 -> device not found (installed)
  1490                              <1> 		;	       or invalid device name
  1491                              <1> 		;	       (AL=0)
  1492                              <1> 		;    device_name = device name address (asciiz)
  1493                              <1> 			;
  1494                              <1> 		; Modified registers: EAX, EBX, ESI, EDI
  1495                              <1> 
  1496 0000FFFA BF[7D650100]        <1> 		mov	edi, device_name
  1497 0000FFFF E805010000          <1> 		call 	lodsb_capitalize
  1498 00010004 88C4                <1> 		mov	ah, al
  1499 00010006 3C2F                <1> 		cmp	al, '/'
  1500 00010008 750E                <1> 		jne	short gdn_1
  1501 0001000A BF[7D650100]        <1> 		mov	edi, device_name
  1502 0001000F E8F5000000          <1> 		call 	lodsb_capitalize
  1503                              <1> gdn_0:
  1504 00010014 20C0                <1> 		and	al, al ; 0 ?
  1505 00010016 7420                <1> 		jz	short gdn_err ; null name after '/'
  1506                              <1> gdn_1:
  1507 00010018 3C44                <1> 		cmp	al, 'D'
  1508 0001001A 7517                <1> 		jne	short gdn_2
  1509 0001001C E8E8000000          <1> 		call 	lodsb_capitalize
  1510 00010021 3C45                <1> 		cmp	al, 'E'
  1511 00010023 750E                <1> 		jne	short gdn_2
  1512 00010025 E8DF000000          <1> 		call 	lodsb_capitalize
  1513 0001002A 3C56                <1> 		cmp	al, 'V'
  1514 0001002C 7505                <1> 		jne	short gdn_2			
  1515 0001002E AC                  <1> 		lodsb
  1516 0001002F 3C2F                <1> 		cmp	al, '/'
  1517 00010031 740D                <1> 		je	short gdn_4
  1518                              <1> gdn_2:
  1519 00010033 80FC2F              <1> 		cmp	ah, '/'
  1520 00010036 750F                <1> 		jne	short gdn_5
  1521                              <1> gdn_err:		
  1522                              <1> 		; invalid device name or device not found
  1523 00010038 31C0                <1> 		xor	eax, eax ; 0
  1524 0001003A F9                  <1> 		stc
  1525 0001003B C3                  <1> 		retn
  1526                              <1> gdn_3:
  1527 0001003C 3C2F                <1> 		cmp	al, '/'
  1528 0001003E 7507                <1> 		jne	short gdn_5
  1529                              <1> gdn_4:
  1530 00010040 BF[7D650100]        <1> 		mov	edi, device_name
  1531 00010045 EB04                <1> 		jmp	short gdn_6
  1532                              <1> gdn_5:
  1533 00010047 3C00                <1> 		cmp	al, 0
  1534 00010049 7419                <1> 		je	short gdn_7
  1535                              <1> gdn_6:
  1536 0001004B E8B9000000          <1> 		call lodsb_capitalize
  1537 00010050 81FF[85650100]      <1> 		cmp	edi, device_name + 8
  1538 00010056 72E4                <1> 		jb	short gdn_3
  1539 00010058 3C00                <1> 		cmp	al, 0
  1540 0001005A 75DC                <1> 		jne	short gdn_err
  1541 0001005C 81FF[7E650100]      <1> 		cmp	edi, device_name + 1
  1542 00010062 76D4                <1> 		jna	short gdn_err ; null name after '/'
  1543                              <1> gdn_7:
  1544 00010064 AA                  <1> 		stosb
  1545                              <1> 		; zero padding ("NAME",0,0,0,0)
  1546 00010065 81FF[85650100]      <1> 		cmp	edi, device_name + 8
  1547 0001006B 72F7                <1> 		jb	short gdn_7
  1548                              <1> gdn_8:
  1549                              <1> 		; search for kernel device names
  1550 0001006D BE[7D650100]        <1> 		mov	esi, device_name 
  1551 00010072 BF[7C140100]        <1> 		mov	edi, KDEV_NAME
  1552 00010077 31C0                <1> 		xor	eax, eax
  1553                              <1> gdn_9:
  1554 00010079 A7                  <1> 		cmpsd	
  1555 0001007A 7505                <1> 		jne	short gdn_10
  1556 0001007C A7                  <1> 		cmpsd
  1557 0001007D 7503                <1> 		jne	short gdn_11
  1558 0001007F EB2B                <1> 		jmp	short gdn_17 ; match
  1559                              <1> gdn_10:
  1560 00010081 A7                  <1> 		cmpsd  ; add esi, 4 & add edi, 4
  1561                              <1> gdn_11:
  1562 00010082 BE[7D650100]        <1> 		mov	esi, device_name
  1563 00010087 FEC0                <1> 		inc	al
  1564 00010089 3C16                <1> 		cmp	al, NumOfKernelDevNames
  1565 0001008B 72EC                <1> 		jb	short gdn_9
  1566                              <1> gdn_12:
  1567                              <1> 		; search for installable device names
  1568                              <1> 		; esi = offset device_name 
  1569 0001008D BF[A8650100]        <1> 		mov	edi, IDEV_NAME
  1570 00010092 28C0                <1> 		sub	al, al ; 0
  1571                              <1> gdn_13:
  1572 00010094 A7                  <1> 		cmpsd	
  1573 00010095 7505                <1> 		jne	short gdn_14
  1574 00010097 A7                  <1> 		cmpsd
  1575 00010098 7503                <1> 		jne	short gdn_15
  1576 0001009A EB3F                <1> 		jmp	short gdn_19 ; match
  1577                              <1> gdn_14:
  1578 0001009C A7                  <1> 		cmpsd  ; add esi, 4 & add edi, 4
  1579                              <1> gdn_15:
  1580 0001009D BE[7D650100]        <1> 		mov	esi, device_name
  1581 000100A2 FEC0                <1> 		inc	al
  1582 000100A4 3C08                <1> 		cmp	al, NumOfInstallableDevices
  1583 000100A6 72EC                <1> 		jb	short gdn_13
  1584                              <1> 
  1585                              <1> gdn_16: 	; error: invalid device name (not found) !
  1586 000100A8 30C0                <1> 		xor	al, al
  1587 000100AA F9                  <1> 		stc
  1588 000100AB C3                  <1> 		retn
  1589                              <1> 
  1590                              <1> gdn_17:		; name match (with one of kernel device names)
  1591                              <1> 		;
  1592                              <1> 		; convert KDEV_NAME index to 
  1593                              <1> 		; KDEV_NUMBER index
  1594                              <1> 		; (different names are used for same devices)
  1595                              <1> 		; (example: "COM1" & "TTY8" = device number 18) 
  1596 000100AC 89C3                <1> 		mov	ebx, eax ; < 256
  1597 000100AE 8A83[2C150100]      <1> 		mov	al, [KDEV_NUMBER+ebx]
  1598                              <1> 
  1599                              <1> 		; check if empty dev entry in the list
  1600 000100B4 80B8[2C670100]00    <1> 		cmp	byte [DEV_OPENMODE+eax], 0
  1601 000100BB 771B                <1> 		ja	short gdn_18 ; it must be already set
  1602                              <1> 
  1603                              <1> 		; (re)set device name and access flags
  1604                              <1> 		; (remain open work will be easy after that)
  1605                              <1> 		; (NOTE: here, data will be copied to bss section)
  1606 000100BD 88C3                <1> 		mov	bl, al
  1607 000100BF 83EF08              <1> 		sub	edi, 8 ; kernel device name address (data)
  1608 000100C2 66C1E302            <1> 		shl	bx, 2 
  1609 000100C6 89BB[4A670100]      <1> 		mov	[DEV_NAME_PTR+ebx], edi ; (all) device names
  1610 000100CC 8A98[82160100]      <1> 		mov	bl, [KDEV_ACCESS+eax] ; kernel dev list (data)
  1611 000100D2 8898[78660100]      <1> 		mov	[DEV_ACCESS+eax], bl ; (all) device list (bss)
  1612                              <1> gdn_18:
  1613 000100D8 FEC0                <1> 		inc	al ; 1 to NumOfKernelDevNames (<=7Fh)
  1614                              <1> 		; eax = device index/entry number
  1615 000100DA C3                  <1> 		retn		
  1616                              <1> 
  1617                              <1> gdn_19:		; name match (with one of installable device names)
  1618                              <1> 		;
  1619                              <1> 		; al = 0 to NumOfInstallableDevices - 1 (<=7Fh)
  1620                              <1> 
  1621 000100DB 89C3                <1> 		mov	ebx, eax
  1622 000100DD 80C316              <1> 		add	bl, NumOfKernelDevices 	; < NUMOFDEVICES	
  1623                              <1> 
  1624                              <1> 		; check if empty dev entry in the list
  1625 000100E0 80BB[2C670100]00    <1> 		cmp	byte [DEV_OPENMODE+ebx], 0
  1626 000100E7 771D                <1> 		ja	short gdn_20 ; it must be already set
  1627                              <1> 
  1628                              <1> 		; (re)set device name and access flags
  1629                              <1> 		; (remain open work will be easy after that)
  1630 000100E9 83EF08              <1> 		sub	edi, 8 ; installable device name address
  1631 000100EC 66C1E302            <1> 		shl	bx, 2 ;*4
  1632 000100F0 89BB[4A670100]      <1> 		mov	[DEV_NAME_PTR+ebx], edi ; (all) device names
  1633 000100F6 66C1EB02            <1> 		shr	bx, 2
  1634 000100FA 8A80[F0650100]      <1> 		mov	al, [IDEV_FLAGS+eax] ; installable dev list
  1635 00010100 8883[78660100]      <1> 		mov	[DEV_ACCESS+ebx], al ; (all) device list
  1636                              <1> gdn_20:	
  1637 00010106 88D8                <1> 		mov	al, bl
  1638                              <1> 		; eax = device index/entry number ; < NUMOFDEVICES  
  1639 00010108 C3                  <1> 		retn
  1640                              <1> 
  1641                              <1> lodsb_capitalize:
  1642                              <1> 	; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1643                              <1> 	; INPUT -> [esi] = character
  1644                              <1> 	;          edi = destination
  1645                              <1> 	; OUTPUT -> AL contains capitalized character
  1646                              <1> 	;	   esi = esi+1
  1647                              <1> 	;	   edi = edi+1	
  1648                              <1> 	; 
  1649 00010109 AC                  <1> 	lodsb	
  1650 0001010A 3C61                <1> 	cmp al, 61h
  1651 0001010C 7206                <1>      	jb  short lodsb_cap_retn
  1652 0001010E 3C7A                <1>      	cmp al, 7Ah
  1653 00010110 7702                <1>      	ja  short lodsb_cap_retn
  1654 00010112 24DF                <1>      	and al, 0DFh
  1655                              <1> lodsb_cap_retn:
  1656 00010114 AA                  <1> 	stosb
  1657 00010115 C3                  <1> 	retn
  1658                              <1> 
  1659                              <1> device_open:
  1660                              <1> 	; 08/10/2016 - TRDOS 386 (TRDOS v2.0)
  1661                              <1> 	; Complete device opening work for sysopen (device)
  1662                              <1> 	;
  1663                              <1> 	; INPUT -> 
  1664                              <1> 	;	EAX = Device Number (AL)
  1665                              <1> 	;        CL = Open mode (1 = read, 2 = write)
  1666                              <1> 	;	 CH = Device access byte (bit 0 = 0)		
  1667                              <1> 	; OUTPUT ->
  1668                              <1> 	;	EAX = Device Number	
  1669                              <1> 	;	CF = 0 -> device has been opened
  1670                              <1> 	;	CF = 1 -> device could not be opened
  1671                              <1> 	;
  1672                              <1> 	;  Modified registers: ebx, (edx, ecx, esi, edi, ebp)
  1673                              <1> 	;
  1674                              <1> 
  1675 00010116 89C3                <1> 	mov	ebx, eax
  1676 00010118 66C1E302            <1> 	shl	bx, 2 ; *4
  1677                              <1> 
  1678 0001011C F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  1679 0001011F 7406                <1> 	jz	short d_open_2 ; Kernel device
  1680                              <1> 	; installable device
  1681                              <1> d_open_1:
  1682 00010121 FFA3[F4650100]      <1>         jmp	dword [ebx+IDEV_OADDR-4]
  1683                              <1> d_open_2:
  1684 00010127 FFA3[3E150100]      <1> 	jmp	dword [ebx+KDEV_OADDR-4]
  1685                              <1> 
  1686                              <1> device_close:
  1687                              <1> 	; 08/10/2016 - TRDOS 386 (TRDOS v2.0)
  1688                              <1> 	; Complete device closing work for sysclose (device)
  1689                              <1> 	;
  1690                              <1> 	; INPUT -> 
  1691                              <1> 	;	EAX = Device Number (AL)
  1692                              <1> 	;        CL = Open mode (1 = read, 2 = write)
  1693                              <1> 	;	 CH = Device access byte (bit 0 = 0)		
  1694                              <1> 	; OUTPUT ->
  1695                              <1> 	;	EAX = Device Number	
  1696                              <1> 	;	CF = 0 -> device has been closed
  1697                              <1> 	;	CF = 1 -> device could not be closed
  1698                              <1> 	;
  1699                              <1> 	; Modified registers: ebx, (edx, ecx, esi, edi, ebp)
  1700                              <1> 	;
  1701                              <1> 
  1702 0001012D 89C3                <1> 	mov	ebx, eax
  1703 0001012F 66C1E302            <1> 	shl	bx, 2 ; *4
  1704                              <1> 
  1705 00010133 F6C580              <1> 	test	ch, 80h ; bit 7, installable device driver flag
  1706 00010136 7406                <1> 	jz	short d_close_2 ; Kernel device
  1707                              <1> 	; installable device
  1708                              <1> d_close_1:
  1709 00010138 FFA3[14660100]      <1>         jmp	dword [ebx+IDEV_CADDR-4]
  1710                              <1> d_close_2:
  1711 0001013E FFA3[8E150100]      <1> 	jmp	dword [ebx+KDEV_CADDR-4]	
  1712                              <1> 
  1713                              <1> rnull:
  1714                              <1> 	; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1715                              <1> 	; read null (read from null device)
  1716 00010144 C3                  <1> 	retn
  1717                              <1> 
  1718                              <1> wnull:
  1719                              <1> 	; 07/10/2016 - TRDOS 386 (TRDOS v2.0)
  1720                              <1> 	; write null (write to null device)
  1721 00010145 C3                  <1> 	retn
  1722                              <1> 
  1723                              <1> dev_IRQ_service:
  1724                              <1> 	; 12/05/2017
  1725                              <1> 	; 13/04/2017
  1726                              <1> 	; 27/02/2017 - TRDOS 386 (TRDOS v2.0)
  1727                              <1> 	; INPUT ->
  1728                              <1> 	;	AL = IRQ Number (0 to 15)
  1729                              <1> 	;	
  1730 00010146 53                  <1> 	push	ebx
  1731 00010147 0FB6D8              <1> 	movzx	ebx, al
  1732 0001014A C0E302              <1> 	shl	bl, 2 ; * 4	
  1733 0001014D 8B9B[B26A0100]      <1> 	mov	ebx, [ebx+DEV_INT_HNDLR]
  1734 00010153 21DB                <1> 	and 	ebx, ebx
  1735 00010155 7404                <1>         jz	short dIRQ_s_retn
  1736 00010157 50                  <1> 	push	eax
  1737                              <1> 
  1738 00010158 FFD3                <1> 	call	ebx
  1739                              <1> 
  1740 0001015A 58                  <1> 	pop	eax
  1741                              <1> dIRQ_s_retn:
  1742 0001015B 5B                  <1> 	pop	ebx
  1743 0001015C C3                  <1> 	retn		
  1744                              <1> 
  1745                              <1> 
  1746                              <1> set_dev_IRQ_service:
  1747                              <1> 	; 13/04/2017 - TRDOS 386 (TRDOS v2.0)
  1748                              <1> 	;
  1749                              <1> 	; Set Device Interrupt Service
  1750                              <1> 	;
  1751                              <1> 	; INPUT ->
  1752                              <1> 	;	AL = IRQ Number
  1753                              <1> 	;	EBX = Hardware Interrupt Service Address
  1754                              <1> 	;
  1755                              <1> 	; Note: There is not a validation check here
  1756                              <1> 	;	because this procedure is called by
  1757                              <1> 	;	TRDOS 386 kernel !
  1758                              <1> 	;       (Even if a device driver does not exist
  1759                              <1> 	;	this setting may be used by sysaudio
  1760                              <1> 	;	and other system calls for hardware
  1761                              <1> 	;	components which use IRQ method for I/O.)
  1762                              <1> 	;
  1763                              <1> 	;push	esi
  1764 0001015D 0FB6F0              <1> 	movzx	esi, al
  1765 00010160 66C1E602            <1> 	shl	si, 2 ; * 4	
  1766 00010164 899E[B26A0100]      <1> 	mov	[esi+DEV_INT_HNDLR], ebx
  1767                              <1> 	;pop	esi
  1768 0001016A C3                  <1> 	retn		
  1769                              <1> 	
  1770                              <1> 
  1771                              <1> sysaudio: ; AUDIO FUNCTIONS
  1772                              <1> 	; 28/07/2020
  1773                              <1> 	; 27/07/2020
  1774                              <1> 	; 10/10/2017
  1775                              <1> 	; 22/06/2017
  1776                              <1> 	; 28/05/2017, 04/06/2017, 05/06/2017, 10/06/2017
  1777                              <1> 	; 01/05/2017, 12/05/2017, 15/05/2017, 20/05/2017
  1778                              <1> 	; 21/04/2017, 22/04/2017, 23/04/2017, 24/04/2017
  1779                              <1> 	; 10/04/2017, 13/04/2017, 14/04/2017, 16/04/2017
  1780                              <1> 	; 03/04/2017 (VIA VT8237R)
  1781                              <1> 	; 01/04/2016 (trdosk6.s -> tdosk8.s)
  1782                              <1> 	; 16/05/2016 - TRDOS 386 (TRDOS v2.0)
  1783                              <1> 	;
  1784                              <1> 	; Inputs:
  1785                              <1> 	;
  1786                              <1> 	;	BH = 0 -> Beep (PC Speaker)
  1787                              <1> 	;	     BL = Duration Counter (1 for 1/64 second)
  1788                              <1> 	;	     CX = Frequency Divisor (1193180/Frequency)
  1789                              <1> 	;		 (1331 for 886 Hz)
  1790                              <1> 	;
  1791                              <1> 	;	01/04/2017	
  1792                              <1> 	;
  1793                              <1> 	; 	BH = 1 -> DETECT (& ENABLE) AUDIO DEVICE
  1794                              <1> 	;	     BL = 0 : PC SPEAKER
  1795                              <1> 	;		  1 : SOUND BLASTER 16
  1796                              <1> 	;		  2 : INTEL AC'97
  1797                              <1> 	;		  3 : VIA VT8237R (VT8233)			 				
  1798                              <1> 	;		  4 : INTEL HDA
  1799                              <1> 	;	      5-FEh : unknown/invalid
  1800                              <1> 	;	        ; 04/06/2017
  1801                              <1> 	;		FFh : Get current audio device id
  1802                              <1> 	;
  1803                              <1> 	; 	BH = 2 -> ALLOCATE AUDIO BUFFER (for user)
  1804                              <1> 	;		ECX = Audio Buffer Size (must be equal to
  1805                              <1> 	;		      the half of DMA buffer size) 
  1806                              <1> 	;		EDX = Virtual Address of the buffer
  1807                              <1> 	;		      (This is not DMA buffer!)
  1808                              <1> 	;
  1809                              <1> 	;	BH = 3 -> INITIALIZE AUDIO DEVICE
  1810                              <1> 	;	     BL = 0,2 -> for Signal Response Byte	 	
  1811                              <1> 	;	     	CL = Signal Response Byte Value (fixed)
  1812                              <1> 	;				if BL = 0
  1813                              <1> 	;	             auto increment of S.R.B. value
  1814                              <1> 	;			 	if BL = 2
  1815                              <1> 	;	        EDX = Signal Response (Return) Byte Address
  1816                              <1> 	;	     	   			
  1817                              <1> 	;	     BL = 1 for CallBack Method	 	
  1818                              <1> 	;	    	EDX = CallBack Service Address (Virtual)
  1819                              <1> 	;
  1820                              <1> 	;	     BL > 2 -> invalid function	
  1821                              <1> 	;
  1822                              <1> 	;	    (Audio buffer must be allocated before
  1823                              <1> 	;	     initialization.) 		
  1824                              <1> 	;
  1825                              <1> 	;	BH = 4 -> START TO PLAY
  1826                              <1> 	;	     BL = Mode
  1827                              <1> 	;		  Bit 0 = mono/stereo (1 = stereo)		
  1828                              <1> 	;		  Bit 1 = 8 bit / 16 bit (1 = 16 bit)
  1829                              <1> 	;	     CX = Sampling Rate (Hz)
  1830                              <1> 	;
  1831                              <1> 	;	BH = 5 -> PAUSE
  1832                              <1> 	;	     BL = Any
  1833                              <1> 	;
  1834                              <1> 	;	BH = 6 -> CONTINUE TO PLAY
  1835                              <1> 	;	     BL = Any
  1836                              <1> 	;
  1837                              <1> 	;	BH = 7 -> STOP
  1838                              <1> 	;	     BL = Any
  1839                              <1> 	;
  1840                              <1> 	;	BH = 8 -> RESET 
  1841                              <1> 	;	     BL = Any
  1842                              <1> 	;
  1843                              <1> 	;	BH = 9 -> CANCEL (CALLBACK or S.R.B. SERVICE)
  1844                              <1> 	;	     BL = Any	
  1845                              <1> 	;	
  1846                              <1> 	;	BH = 10 -> DEALLOCATE AUDIO BUFFER (for user)
  1847                              <1> 	;	     BL = Any
  1848                              <1> 	;
  1849                              <1> 	;	BH = 11 -> SET VOLUME LEVEL
  1850                              <1> 	;	     BL: (Bit 0 to 6)
  1851                              <1> 	;		  0 = Master (Playback, Lineout) volume
  1852                              <1> 	;	     CL = Left Channel Volume
  1853                              <1> 	;	     CH = Right Channel Volume
  1854                              <1> 	;	
  1855                              <1> 	;	     Note: If BL >= 80h (Bit 7 of BL is set),
  1856                              <1> 	;	     volume level will be set for next playing
  1857                              <1> 	;	     (actual volume level will not be changed
  1858                              <1> 	;	     immediately)	
  1859                              <1> 	;
  1860                              <1> 	;	BH = 12 -> DISABLE AUDIO DEVICE
  1861                              <1> 	;	     (reset audio device and unlink dma buffer)	
  1862                              <1> 	;	     BL = Any	  		  	  	
  1863                              <1> 	;
  1864                              <1> 	;    	12/05/2017
  1865                              <1> 	;	BH = 13 -> MAP DMA BUFFER TO USER
  1866                              <1> 	;	    (for direct access to system's dma buffer)
  1867                              <1> 	;
  1868                              <1> 	;	     ECX = map size in bytes 
  1869                              <1> 	;		  (will be rounded up to page borders)
  1870                              <1> 	;	     EDX = Virtual Address of the buffer
  1871                              <1> 	;		  (Will be rounded up to page borders)
  1872                              <1> 	;
  1873                              <1> 	;	05/06/2017	
  1874                              <1> 	;    	04/06/2017
  1875                              <1> 	;	BH = 14 -> GET AUDIO DEVICE INFO
  1876                              <1> 	;	     BL: 0 = Audio Controller Info
  1877                              <1> 	;	       > 0 = Invalid for now! 
  1878                              <1> 	;
  1879                              <1> 	;	22/06/2017	
  1880                              <1> 	;	BH = 15 -> GET CURRENT SOUND DATA (for graphics)
  1881                              <1> 	;	     BL: 0 -> PCM OUT data
  1882                              <1> 	;	       > 0 -> Invalid for now! 
  1883                              <1> 	;	     ECX = 0 -> Get DMA Buffer Pointer
  1884                              <1> 	;		 EDX = Not Used
  1885                              <1> 	;	     ECX > 0 -> Byte count for buffer (EDX)	 	
  1886                              <1> 	;	         EDX = Buffer Address (Virtual)	
  1887                              <1> 	;
  1888                              <1> 	;	10/10/2017	
  1889                              <1> 	;	BH = 16 -> UPDATE DMA BUFFER DATA
  1890                              <1> 	;		   (by using the Audio Buffer content)
  1891                              <1> 	;	     BL = 0 : Update dma half buffer in sequence
  1892                              <1> 	;		      (automatic destination)	
  1893                              <1> 	;		  1 : Update 1st half of the dma buffer
  1894                              <1> 	;		  2 : Update 2nd half of the dma buffer
  1895                              <1> 	;		  3-FEh: Invalid!
  1896                              <1> 	;		  FFh = Get current flag value
  1897                              <1> 	;			(Half buffer number -1)
  1898                              <1> 	;
  1899                              <1> 	;
  1900                              <1> 	; Outputs:
  1901                              <1> 	;
  1902                              <1> 	;	For BH = 0 -> Beep
  1903                              <1> 	;	    None
  1904                              <1> 	;
  1905                              <1> 	;	01/04/2017
  1906                              <1> 	;
  1907                              <1> 	; 	For BH = 1 -> DETECT (& ENABLE) AUDIO DEVICE
  1908                              <1> 	;	    AH = 0 : PC SPEAKER
  1909                              <1> 	;		 1 : SOUND BLASTER 16
  1910                              <1> 	;		 2 : INTEL AC'97
  1911                              <1> 	;		 3 : VIA VT8237R (VT8233)			 				
  1912                              <1> 	;		 4 : INTEL HDA
  1913                              <1> 	;	      5-FFh : unknown/invalid
  1914                              <1> 	;	    AL = mode status
  1915                              <1> 	;		 bit 0 = mono /stereo (1 = stereo)
  1916                              <1> 	;		 bit 1 = 8 bit / 16 bit ( 1 = 16 bit)
  1917                              <1> 	;	    04/06/2017
  1918                              <1> 	;	    EBX = PCI DEVICE/VENDOR ID (if >0)
  1919                              <1> 	;		 (BX = VENDOR ID) 
  1920                              <1> 	;	    (if CF = 1 -> Error code in EAX)
  1921                              <1> 	;
  1922                              <1> 	; 	For BH = 2 -> ALLOCATE AUDIO BUFFER (for user)
  1923                              <1> 	;	    EAX = Physical Address of the buffer
  1924                              <1> 	;	    (if CF = 1 -> Error code in EAX)
  1925                              <1> 	;
  1926                              <1> 	;	For BH = 3 -> INITIALIZE AUDIO DEVICE
  1927                              <1> 	;	    (if CF = 1 -> Error code in EAX)
  1928                              <1> 	;
  1929                              <1> 	;	For BH = 4 -> START TO PLAY
  1930                              <1> 	;	    none (if CF = 1 -> Error code in EAX)	
  1931                              <1> 	;
  1932                              <1> 	;	For BH = 5 -> PAUSE
  1933                              <1> 	;	    none (if CF = 1 -> Error code in EAX)	
  1934                              <1> 	;
  1935                              <1> 	;	For BH = 6 -> CONTINUE TO PLAY
  1936                              <1> 	;	    none (if CF = 1 -> Error code in EAX)	
  1937                              <1> 	;
  1938                              <1> 	;	For BH = 7 -> STOP
  1939                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1940                              <1> 	;
  1941                              <1> 	;	For BH = 8 -> RESET 
  1942                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1943                              <1> 	;
  1944                              <1> 	;	For BH = 9 -> CANCEL (CALLBACK or S.R.B. SERVICE)
  1945                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1946                              <1> 	;	
  1947                              <1> 	;	For BH = 10 -> DEALLOCATE AUDIO BUFFER (for user)
  1948                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1949                              <1> 	;
  1950                              <1> 	;	For BH = 11 -> SET VOLUME LEVEL
  1951                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1952                              <1> 	;
  1953                              <1> 	;	For BH = 12 -> DISABLE AUDIO DEVICE
  1954                              <1> 	;	    none (if CF = 1 -> Error code in EAX)
  1955                              <1> 	; 
  1956                              <1> 	;    	12/05/2017
  1957                              <1> 	;	For BH = 13 -> MAP DMA BUFFER TO USER
  1958                              <1> 	;	    EAX = Physical Address of the buffer
  1959                              <1> 	;	    (if CF = 1 -> Error code in EAX)	
  1960                              <1> 	;
  1961                              <1> 	;    	04/06/2017
  1962                              <1> 	;	For BH = 14 -> GET AUDIO DEVICE INFO
  1963                              <1> 	;	(for BL = 0) ; 05/06/2017	
  1964                              <1> 	;	    EAX = IRQ Number in AL
  1965                              <1> 	;		  Audio Device Number in AH 
  1966                              <1> 	;	    EBX = DEV/VENDOR ID
  1967                              <1> 	;		 (DDDDDDDDDDDDDDDDVVVVVVVVVVVVVVVV)
  1968                              <1> 	;	    ECX = BUS/DEV/FN 
  1969                              <1> 	;		 (00000000BBBBBBBBDDDDDFFF00000000)
  1970                              <1> 	;	    EDX = NABMBAR/NAMBAR (for AC97)
  1971                              <1> 	;		  (Low word, DX = NAMBAR address)
  1972                              <1> 	;	    EDX = Base IO Addr (DX) for SB16 & VT8233	  			  		
  1973                              <1> 	;	    (if CF = 1 -> Error code in EAX)	
  1974                              <1> 	;	                 (ERR_DEV_NOT_RDY = 15)  
  1975                              <1> 	;
  1976                              <1> 	;	22/06/2017	
  1977                              <1> 	;	For BH = 15 -> GET CURRENT SOUND DATA
  1978                              <1> 	;			 (for graphics)
  1979                              <1> 	;	(for BL = 0)
  1980                              <1> 	;	 If ECX input is 0 
  1981                              <1> 	;	    EAX = DMA Buffer Current Position (Offset)
  1982                              <1> 	;	 If ECX input >  0
  1983                              <1> 	;	    EAX = Actual transfer count 		 	
  1984                              <1> 	;	    (Sound samples will be copied from 
  1985                              <1> 	;	     Current DMA Buffer Position to EDX
  1986                              <1> 	;	     virtual address as EAX bytes.)
  1987                              <1> 	;	 ((If CF = 1 ->  Error code in EAX))
  1988                              <1> 	;
  1989                              <1> 	;
  1990                              <1> 	;	10/10/2017	
  1991                              <1> 	;	For BH = 16 -> UPDATE DMA BUFFER DATA
  1992                              <1> 	;	    EAX = 0, if the updated (or current)
  1993                              <1> 	;		     half buffer is DMA half buffer 1
  1994                              <1> 	;	    EAX = 1, if the updated (or current)
  1995                              <1> 	; 		     half buffer is DMA half buffer 2 	  	
  1996                              <1> 	;	    (If CF = 1 -> Error code in EAX)	
  1997                              <1> 	;	
  1998                              <1> 
  1999 0001016B 80FF11              <1> 	cmp	bh, AUDIO1L/4
  2000 0001016E 0F83EEC5FFFF        <1> 	jnb	sysret
  2001                              <1> 
  2002 00010174 C0E702              <1> 	shl	bh, 2 ; *4	
  2003 00010177 0FB6F7              <1> 	movzx	esi, bh
  2004                              <1> 
  2005                              <1> 	; 22/04/2017
  2006 0001017A 31C0                <1> 	xor	eax, eax
  2007 0001017C A3[64030300]        <1> 	mov	[u.r0], eax  ; 0
  2008                              <1> 		
  2009 00010181 FF96[8C010100]      <1> 	call	dword [esi+AUDIO1]
  2010                              <1> 	;jc	error
  2011 00010187 E9D6C5FFFF          <1> 	jmp	sysret	
  2012                              <1> 
  2013 0001018C [AA1D0000]          <1> AUDIO1:	dd	beep ; FUNCTION = 0 (bl = Duration Counter
  2014                              <1> 		     ; 		     cx = Frequency Divisor
  2015 00010190 [D0010100]          <1> 	dd	soundc_detect
  2016 00010194 [6C020100]          <1> 	dd	sound_alloc
  2017 00010198 [2A030100]          <1> 	dd	soundc_init
  2018 0001019C [E2040100]          <1> 	dd	sound_play
  2019 000101A0 [7E050100]          <1> 	dd	sound_pause
  2020 000101A4 [A8050100]          <1> 	dd	sound_continue
  2021 000101A8 [D2050100]          <1> 	dd	sound_stop
  2022 000101AC [FB050100]          <1> 	dd	soundc_reset
  2023 000101B0 [2C060100]          <1> 	dd	soundc_cancel
  2024 000101B4 [52060100]          <1> 	dd	sound_dalloc
  2025 000101B8 [7D060100]          <1> 	dd	sound_volume
  2026 000101BC [CF060100]          <1> 	dd	soundc_disable
  2027 000101C0 [41070100]          <1> 	dd	sound_dma_map
  2028 000101C4 [B0070100]          <1> 	dd	soundc_info
  2029 000101C8 [0F080100]          <1> 	dd	sound_data
  2030 000101CC [BC080100]          <1> 	dd	sound_update
  2031                              <1> 	
  2032                              <1> AUDIO1L	EQU	$ - AUDIO1
  2033                              <1> 
  2034                              <1> soundc_detect:
  2035                              <1> 	; FUNCTION = 1
  2036                              <1> 	; bl = Audio device type number 
  2037                              <1> 	; (0= pc speaker, 1 = sound blaster 16, 2 = intel ac97
  2038                              <1> 	;  3= via vt823x, 4 = intel HDA, 0FFh= any)
  2039                              <1> 	
  2040                              <1> 	; 04/06/2017
  2041 000101D0 8A25[416B0100]      <1> 	mov	ah, [audio_device]
  2042 000101D6 80FBFF              <1> 	cmp	bl, 0FFh ; get current audio device id
  2043 000101D9 7408                <1> 	je	short sysaudio0
  2044                              <1> 
  2045 000101DB 20E4                <1> 	and	ah, ah
  2046 000101DD 741E                <1> 	jz	short soundc_get_dev
  2047                              <1> 
  2048 000101DF 38DC                <1> 	cmp	ah, bl
  2049 000101E1 7567                <1> 	jne	short soundc_dev_err
  2050                              <1> 
  2051                              <1> sysaudio0:	
  2052 000101E3 A0[426B0100]        <1> 	mov	al, [audio_mode]
  2053                              <1> sysaudio1:
  2054 000101E8 A3[64030300]        <1> 	mov	[u.r0], eax
  2055 000101ED 8B1D[4C6B0100]      <1> 	mov	ebx, [audio_vendor] ; (DEVICE/VENDOR ID)
  2056 000101F3 8B2D[60030300]      <1> 	mov	ebp, [u.usp]
  2057 000101F9 895D10              <1> 	mov	[ebp+16], ebx  ; ebx
  2058 000101FC C3                  <1> 	retn
  2059                              <1> 
  2060                              <1> soundc_get_dev:
  2061                              <1> 	; 28/05/2017
  2062                              <1> 	; 03/04/2017, 24/04/2017
  2063 000101FD C605[406B0100]00    <1> 	mov	byte [audio_pci], 0
  2064 00010204 80FB03              <1> 	cmp	bl, 3 ; VIA VT8233 (VT8237R) Audio Controller & AC97 Codec
  2065                              <1> 	;jne	short soundc_get_dev_sb
  2066                              <1> 	; 28/05/2017
  2067 00010207 7220                <1> 	jb	short soundc_get_dev_sb
  2068 00010209 773F                <1> 	ja	short soundc_dev_err  ; temporary (28/05/2017)
  2069                              <1> 	;  		
  2070 0001020B E848180000          <1> 	call	DetectVT8233
  2071 00010210 7238                <1> 	jc	short soundc_dev_err
  2072                              <1> 	; eax = 0
  2073                              <1> 
  2074                              <1> 	;mov	ebx, [audio_vendor]
  2075                              <1> 	; ebx = DEVICE/VENDOR ID
  2076                              <1> 	;	DDDDDDDDDDDDDDDDVVVVVVVVVVVVVVVV
  2077                              <1> 
  2078 00010212 B003                <1> 	mov	al, 3  ; VIA VT8237R (VT3233) Audio Controller
  2079 00010214 88C4                <1> 	mov	ah, al
  2080                              <1> 
  2081                              <1> soundc_get_pci_dev_ok: ; 28/05/2017
  2082 00010216 FE05[406B0100]      <1> 	inc	byte [audio_pci] ; = 1
  2083                              <1> soundc_get_dev_ok:
  2084                              <1> 	
  2085                              <1> soundc_get_dev_sb16_ok:
  2086 0001021C A2[416B0100]        <1> 	mov	[audio_device], al
  2087 00010221 8825[426B0100]      <1> 	mov	[audio_mode], ah ; stereo (bit0), 16 bit (bit1) capability	
  2088 00010227 EBBF                <1> 	jmp	short sysaudio1
  2089                              <1> 
  2090                              <1> soundc_get_dev_sb:
  2091                              <1> 	; 24/04/2017
  2092 00010229 80FB01              <1> 	cmp	bl, 1 ; Sound Blaster 16
  2093 0001022C 750E                <1> 	jne	short soundc_get_dev_ich ; 28/05/2017
  2094                              <1> 	;
  2095 0001022E E8491D0000          <1> 	call	DetectSB
  2096 00010233 7215                <1> 	jc	short soundc_dev_err
  2097 00010235 B801030000          <1> 	mov	eax, 0301h ; Sound Blaster 16
  2098 0001023A EBE0                <1> 	jmp	short soundc_get_dev_sb16_ok
  2099                              <1> 
  2100                              <1> soundc_get_dev_ich:
  2101                              <1> 	; 28/05/2017
  2102                              <1> 	;cmp	bl, 2 ; Intel AC'97 Audio Controller (ICH)
  2103                              <1> 	;jne	short soundc_dev_err ; Temporary  (28/05/2017)
  2104                              <1> 	;			     ; (Here will be modified just after
  2105                              <1> 	;			     ; new sound card code will be ready!)  	
  2106 0001023C E80A180000          <1> 	call	DetectICH
  2107 00010241 7207                <1> 	jc	short soundc_dev_err
  2108                              <1> 	;
  2109 00010243 B802030000          <1> 	mov	eax, 0302h ; AC'97 (ICH)
  2110 00010248 EBCC                <1> 	jmp	short soundc_get_pci_dev_ok
  2111                              <1> 
  2112                              <1> soundc_dev_err:
  2113 0001024A B80F000000          <1> 	mov	eax, ERR_DEV_NOT_RDY ; Device not ready !
  2114 0001024F EB0C                <1> 	jmp	short sysaudio_err
  2115                              <1> 
  2116                              <1> sound_buff_error:
  2117 00010251 B82E000000          <1> 	mov	eax, ERR_BUFFER ; Buffer error !
  2118 00010256 EB05                <1> 	jmp	short sysaudio_err
  2119                              <1> 
  2120                              <1> soundc_respond_err:
  2121                              <1> 	; ERR_TIME_OUT ; 'time out !' error	
  2122 00010258 B819000000          <1> 	mov	eax, ERR_DEV_NOT_RESP ; 'device not responding !' error
  2123                              <1> sysaudio_err:
  2124 0001025D A3[64030300]        <1> 	mov	[u.r0], eax
  2125 00010262 A3[C8030300]        <1> 	mov	[u.error], eax
  2126 00010267 E9D6C4FFFF          <1> 	jmp	error
  2127                              <1> 
  2128                              <1> sound_alloc:
  2129                              <1> 	; FUNCTION =  2
  2130                              <1> 	; ecx = audio buffer size (in bytes)
  2131                              <1> 	; edx = audio buffer address (virtual)
  2132                              <1> 	; 27/07/2020
  2133                              <1> 	; 28/05/2017
  2134                              <1> 	; 01/05/2017, 15/05/2017
  2135                              <1> 	; 21/04/2017, 24/04/2017
  2136 0001026C 803D[406B0100]00    <1> 	cmp	byte [audio_pci], 0
  2137 00010273 7708                <1> 	ja	short snd_alloc_0
  2138                              <1> 	; Max. 64KB DMA buffer !!!
  2139 00010275 81F900800000        <1> 	cmp	ecx, 32768
  2140 0001027B 77D4                <1> 	ja	short sound_buff_error
  2141                              <1> snd_alloc_0:
  2142                              <1> 	; 15/05/2017
  2143 0001027D 81F900100000        <1> 	cmp	ecx, 4096 ; PAGE_SIZE
  2144 00010283 72CC                <1> 	jb	short sound_buff_error
  2145                              <1> 	;
  2146 00010285 A1[546B0100]        <1> 	mov	eax, [audio_buffer] ; audio buffer address (current)
  2147 0001028A 09C0                <1> 	or	eax, eax
  2148 0001028C 7445                <1> 	jz	short snd_alloc_2
  2149                              <1> 	; audio buffer exists !
  2150 0001028E 8A1D[B3030300]      <1> 	mov	bl, [u.uno]
  2151 00010294 3A1D[696B0100]      <1> 	cmp	bl, [audio_user]
  2152 0001029A 0F85FC000000        <1> 	jne	sndc_owner_error ; not owner !
  2153 000102A0 39D0                <1> 	cmp	eax, edx ; same virtual buffer address ?
  2154 000102A2 7508                <1> 	jne	short snd_alloc_1
  2155 000102A4 3B0D[5C6B0100]      <1> 	cmp	ecx, [audio_buff_size]
  2156 000102AA 746C                <1> 	je	short snd_alloc_3 ; Nothing to do !
  2157                              <1> 				  ; Buffer has been set already!
  2158                              <1> snd_alloc_1:
  2159 000102AC 51                  <1> 	push	ecx
  2160 000102AD 52                  <1> 	push	edx
  2161 000102AE 89C3                <1> 	mov	ebx, eax ; audio buffer address (current)
  2162 000102B0 8B0D[5C6B0100]      <1> 	mov	ecx, [audio_buff_size]
  2163 000102B6 E82155FFFF          <1> 	call	deallocate_user_pages
  2164 000102BB 5A                  <1> 	pop	edx
  2165 000102BC 59                  <1> 	pop	ecx
  2166 000102BD 31C0                <1> 	xor	eax, eax ; 0
  2167 000102BF A3[546B0100]        <1> 	mov	[audio_buffer], eax  ; 0
  2168 000102C4 A3[586B0100]        <1>  	mov	[audio_p_buffer], eax  ; 0
  2169 000102C9 A3[5C6B0100]        <1>  	mov	[audio_buff_size], eax
  2170 000102CE A2[696B0100]        <1> 	mov	[audio_user], al ; 0
  2171                              <1> snd_alloc_2:
  2172 000102D3 89D3                <1> 	mov	ebx, edx
  2173                              <1> 	; 01/05/2017
  2174 000102D5 BA00F0FFFF          <1> 	mov	edx, ~PAGE_OFF ; truncating page offsets
  2175                              <1> 			       ; for aligning to page borders	
  2176                              <1> 	;and	eax, edx
  2177 000102DA 21D3                <1> 	and	ebx, edx
  2178 000102DC 21D1                <1> 	and	ecx, edx
  2179                              <1> 	; 15/05/2017
  2180                              <1> 	; EAX = Beginning address (physical)
  2181                              <1> 	; EAX = 0 -> Allocate mem block from the 1st proper aperture	
  2182                              <1> 	; ECX = Number of bytes to be allocated		
  2183 000102DE E89E51FFFF          <1> 	call	allocate_memory_block
  2184 000102E3 0F8268FFFFFF        <1> 	jc	sound_buff_error
  2185                              <1> 	; EAX = Physical address of the allocated memory block
  2186                              <1> 	; ECX = Allocated bytes (as truncated to page border)
  2187                              <1> 	; EBX = Virtual address (as truncated to page border)
  2188 000102E9 50                  <1> 	push	eax
  2189 000102EA 53                  <1> 	push	ebx
  2190 000102EB 51                  <1> 	push	ecx
  2191 000102EC E8E055FFFF          <1> 	call	allocate_user_pages
  2192 000102F1 59                  <1> 	pop	ecx
  2193 000102F2 5B                  <1> 	pop	ebx
  2194 000102F3 58                  <1> 	pop	eax
  2195 000102F4 722A                <1> 	jc	short snd_alloc_4  ; insufficient memory, buff error
  2196                              <1> 	; eax = physical address of the user's audio buffer
  2197                              <1> 	; ebx = virtual address of the user's audio buffer
  2198                              <1> 	; ecx = buffer size (in bytes)
  2199 000102F6 A3[586B0100]        <1> 	mov	[audio_p_buffer], eax
  2200 000102FB 891D[546B0100]      <1> 	mov	[audio_buffer], ebx
  2201 00010301 890D[5C6B0100]      <1>  	mov	[audio_buff_size], ecx
  2202 00010307 8A15[B3030300]      <1> 	mov	dl, [u.uno]
  2203 0001030D 8815[696B0100]      <1> 	mov	[audio_user], dl
  2204 00010313 A3[64030300]        <1> 	mov	[u.r0], eax
  2205                              <1> snd_alloc_3:
  2206                              <1> 	; 27/07/2020
  2207 00010318 C605[686B0100]00    <1> 	mov	byte [audio_flag], 0 ; clear dma half buffer flag
  2208                              <1> 	;	
  2209 0001031F C3                  <1> 	retn
  2210                              <1> snd_alloc_4:
  2211                              <1> 	; 15/05/2017
  2212                              <1> 	; EAX = Beginning address (physical)
  2213                              <1> 	; ECX = Number of bytes to be deallocated
  2214 00010320 E86953FFFF          <1> 	call	deallocate_memory_block
  2215 00010325 E927FFFFFF          <1> 	jmp	sound_buff_error  ; insufficient memory, buff error
  2216                              <1> 
  2217                              <1> soundc_init:
  2218                              <1> 	; FUNCTION = 3 
  2219                              <1> 	; bl = method (0= s.r.b., 1= callback, 2= auto incr s.r.b.)
  2220                              <1> 	; cl = signal response byte (initial or fixed) value
  2221                              <1> 	; edx = signal response byte or callback address
  2222                              <1> 	; 27/07/2020
  2223                              <1> 	; 28/05/2017
  2224                              <1> 	; 12/05/2017, 20/05/2017
  2225                              <1> 	; 22/04/2017, 23/04/2017, 24/04/2017
  2226                              <1> 	; 13/04/2017, 14/04/2017, 16/04/2017, 21/04/2017
  2227                              <1> 	; 03/04/2017, 10/04/2017
  2228                              <1> 
  2229 0001032A A0[416B0100]        <1> 	mov	al, [audio_device]
  2230 0001032F 20C0                <1> 	and	al, al
  2231 00010331 7549                <1> 	jnz	short sndc_init_6
  2232                              <1> 	;
  2233 00010333 C605[406B0100]00    <1> 	mov	byte [audio_pci], 0
  2234 0001033A 52                  <1> 	push	edx
  2235 0001033B 53                  <1> 	push	ebx
  2236 0001033C 51                  <1> 	push	ecx
  2237 0001033D E83A1C0000          <1> 	call	DetectSB
  2238 00010342 7213                <1> 	jc	short sndc_init_8
  2239 00010344 66B80103            <1> 	mov	ax, 0301h ; Sound Blaster 16
  2240 00010348 EB1E                <1> 	jmp	short sndc_init_7
  2241                              <1> 
  2242                              <1> sndc_init_11:
  2243                              <1> 	; 28/05/2017
  2244 0001034A E8FC160000          <1> 	call	DetectICH ; Detect AC'97 (ICH) Audio Controller
  2245 0001034F 7217                <1> 	jc	short sndc_init_7
  2246 00010351 66B80203            <1> 	mov	ax, 0302h ; Intel AC'97 Audio Device
  2247 00010355 EB0B                <1> 	jmp	short sndc_init_12 ; (PCI device)
  2248                              <1> 
  2249                              <1> sndc_init_8:
  2250 00010357 E8FC160000          <1> 	call	DetectVT8233
  2251                              <1> 	;jc	short sndc_init_7
  2252 0001035C 72EC                <1> 	jc	sndc_init_11 ; 28/05/2017
  2253                              <1> 	; eax = 0
  2254 0001035E B003                <1> 	mov	al, 3	; VIA VT8237R (VT3233) Audio Controller
  2255 00010360 88C4                <1> 	mov	ah, al
  2256                              <1> 
  2257                              <1> sndc_init_12:
  2258 00010362 FE05[406B0100]      <1> 	inc	byte [audio_pci] ; = 1
  2259                              <1> sndc_init_7:
  2260 00010368 59                  <1> 	pop	ecx
  2261 00010369 5B                  <1> 	pop	ebx
  2262 0001036A 5A                  <1> 	pop	edx
  2263 0001036B 0F82D9FEFFFF        <1> 	jc	soundc_dev_err
  2264                              <1> 	;
  2265 00010371 A2[416B0100]        <1> 	mov	[audio_device], al
  2266 00010376 8825[426B0100]      <1> 	mov	[audio_mode], ah ; stereo (bit0), 16 bit (bit1) capability
  2267                              <1> 
  2268                              <1> sndc_init_6:
  2269 0001037C 833D[546B0100]00    <1> 	cmp	dword [audio_buffer], 0
  2270 00010383 0F86C8FEFFFF        <1> 	jna	sound_buff_error
  2271                              <1> 
  2272 00010389 A0[B3030300]        <1> 	mov	al, [u.uno]
  2273 0001038E 8A25[696B0100]      <1> 	mov	ah, [audio_user]
  2274 00010394 08E4                <1> 	or	ah, ah
  2275 00010396 7418                <1> 	jz	short sndc_init0
  2276 00010398 38E0                <1> 	cmp	al, ah
  2277 0001039A 7419                <1> 	je	short sndc_init1
  2278                              <1> 
  2279                              <1> sndc_owner_error:
  2280 0001039C B80B000000          <1> 	mov	eax, ERR_NOT_OWNER ; 'permission denied !' error
  2281                              <1> sndc_perm_error:
  2282 000103A1 A3[64030300]        <1> 	mov	[u.r0], eax
  2283 000103A6 A3[C8030300]        <1> 	mov	[u.error], eax
  2284 000103AB E992C3FFFF          <1> 	jmp	error
  2285                              <1> sndc_init0:
  2286 000103B0 A2[696B0100]        <1> 	mov	[audio_user], al
  2287                              <1> sndc_init1:
  2288 000103B5 8915[6C6B0100]      <1> 	mov	[audio_cb_addr], edx
  2289 000103BB 881D[6A6B0100]      <1> 	mov	[audio_cb_mode], bl
  2290 000103C1 880D[6B6B0100]      <1> 	mov	[audio_srb], cl
  2291                              <1> 
  2292                              <1> 	; 27/07/2020
  2293                              <1> 	;mov	byte [audio_flag], 0  ; clear dma half buffer flag
  2294                              <1> 
  2295                              <1> 	; 24/04/2017
  2296 000103C7 803D[416B0100]03    <1> 	cmp	byte [audio_device], 3 ; VT8233 (VT8237R)
  2297 000103CE 7438                <1> 	je	short sndc_init_9
  2298                              <1> 	;ja	short soundc_respond_err ; temporary (28/05/2017)
  2299 000103D0 803D[416B0100]01    <1> 	cmp	byte [audio_device], 1 ; SB 16
  2300 000103D7 7510                <1> 	jne	short sndc_init_13
  2301 000103D9 BB[A1210100]        <1> 	mov	ebx, sb16_int_handler
  2302                              <1> 	; Note: 'SbInit' is at 'Start to Play' stage
  2303                              <1> 	; 20/05/2017
  2304 000103DE 66C705[766B0100]08- <1> 	mov	word [audio_master_volume], 0808h ; 2/8
  2304 000103E6 08                  <1>
  2305 000103E7 EB3F                <1> 	jmp	short sndc_init_10
  2306                              <1> sndc_init_13:
  2307                              <1> 	; 28/05/2017
  2308 000103E9 803D[416B0100]02    <1> 	cmp	byte [audio_device], 2 ; AC 97 (ICH)	
  2309 000103F0 0F8562FEFFFF        <1> 	jne	soundc_respond_err ; temporary (28/05/2017)
  2310                              <1> 
  2311 000103F6 E8FB1E0000          <1> 	call	ac97_codec_config
  2312 000103FB 0F8257FEFFFF        <1> 	jc	soundc_respond_err ; codec error !
  2313                              <1> 
  2314 00010401 BB[DD240100]        <1> 	mov	ebx, ac97_int_handler
  2315 00010406 EB20                <1> 	jmp	short sndc_init_10	
  2316                              <1> 
  2317                              <1> sndc_init_9:
  2318                              <1> 	;call	reset_codec
  2319                              <1> 	;; eax = 1
  2320                              <1> 	;call	codec_io_w16 ; w32
  2321 00010408 E8C2170000          <1> 	call	init_codec ; 28/05/2017
  2322 0001040D 0F8245FEFFFF        <1> 	jc	soundc_respond_err ; codec error !
  2323                              <1> 
  2324 00010413 E8E9190000          <1> 	call	channel_reset
  2325                              <1> 
  2326                              <1> 	; setup the Codec (actually mixer registers) 
  2327 00010418 E809190000          <1>         call    codec_config  ; unmute codec, set rates.
  2328 0001041D 0F8235FEFFFF        <1> 	jc	soundc_respond_err ; codec error !
  2329                              <1> 
  2330 00010423 BB[931D0100]        <1> 	mov	ebx, vt8233_int_handler
  2331                              <1> sndc_init_10:
  2332                              <1> 	; 13/04/2017
  2333 00010428 A0[436B0100]        <1> 	mov	al, [audio_intr] ; IRQ number	
  2334 0001042D E82BFDFFFF          <1> 	call	set_dev_IRQ_service
  2335                              <1> 
  2336                              <1> 	; SETUP (audio) INTERRUPT CALLBACK SERVICE
  2337 00010432 8A1D[436B0100]      <1> 	mov	bl, [audio_intr] ; IRQ number
  2338 00010438 8A3D[6A6B0100]      <1> 	mov	bh, [audio_cb_mode]
  2339 0001043E FEC7                <1> 	inc	bh  ; 1 = Signal Response Byte method (fixed value)
  2340                              <1> 		    ; 2 = Callback service method
  2341                              <1> 		    ; 3 = Auto Increment S.R.B. method 	
  2342 00010440 8A0D[6B6B0100]      <1> 	mov	cl, [audio_srb]
  2343 00010446 8B15[6C6B0100]      <1> 	mov	edx, [audio_cb_addr]
  2344 0001044C A0[696B0100]        <1> 	mov	al, [audio_user]
  2345                              <1> 	; 14/04/2017
  2346 00010451 E8E1040000          <1>  	call	set_irq_callback_service
  2347                              <1> 	; 16/04/2017
  2348 00010456 A3[64030300]        <1> 	mov	[u.r0], eax
  2349                              <1> 	;jnc	sysret
  2350 0001045B 7316                <1> 	jnc	short sndc_init2 ; 21/04/2017
  2351                              <1> 	;
  2352 0001045D A3[C8030300]        <1> 	mov	dword [u.error], eax
  2353                              <1> 
  2354 00010462 A0[436B0100]        <1> 	mov	al, [audio_intr] ; IRQ number	
  2355 00010467 31DB                <1> 	xor	ebx, ebx ; reset IRQ handler address
  2356 00010469 E8EFFCFFFF          <1> 	call	set_dev_IRQ_service
  2357                              <1> 
  2358 0001046E E9CFC2FFFF          <1> 	jmp	error
  2359                              <1> 
  2360                              <1> sndc_init2:
  2361                              <1> 	; 21/04/2017
  2362 00010473 8B0D[5C6B0100]      <1> 	mov	ecx, [audio_buff_size] ; audio buffer size
  2363 00010479 D1E1                <1> 	shl	ecx, 1 ; *2
  2364 0001047B A1[606B0100]        <1> 	mov	eax, [audio_dma_buff]
  2365 00010480 21C0                <1> 	and	eax, eax
  2366 00010482 7415                <1> 	jz	short sndc_init3
  2367                              <1> 
  2368 00010484 8B15[646B0100]      <1> 	mov	edx, [audio_dmabuff_size] ; dma buffer size
  2369 0001048A 39D1                <1> 	cmp	ecx, edx
  2370 0001048C 744D                <1> 	je	short sndc_init5
  2371                              <1> 
  2372 0001048E 87CA                <1> 	xchg	ecx, edx
  2373 00010490 E8F951FFFF          <1> 	call	deallocate_memory_block
  2374 00010495 87D1                <1> 	xchg	edx, ecx
  2375 00010497 31C0                <1> 	xor	eax, eax
  2376                              <1> sndc_init3:
  2377                              <1> 	; 12/05/2017
  2378 00010499 803D[416B0100]01    <1> 	cmp	byte [audio_device], 1 ; SB 16
  2379 000104A0 7515                <1> 	jne	short sndc_init4
  2380 000104A2 C705[606B0100]-     <1> 	mov	dword [audio_dma_buff], sb16_dma_buffer
  2380 000104A8 [00000200]          <1>
  2381 000104AC C705[646B0100]0000- <1> 	mov	dword [audio_dmabuff_size], 65536
  2381 000104B4 0100                <1>
  2382                              <1> 	;xor	eax, eax
  2383                              <1> 	;mov	[u.r0], eax ; 0 = no error, successful
  2384 000104B6 C3                  <1> 	retn 
  2385                              <1> 
  2386                              <1> sndc_init4:
  2387                              <1> 	; EAX = Beginning address (physical)
  2388                              <1> 	; EAX = 0 -> Allocate mem block from the 1st proper aperture	
  2389                              <1> 	; ECX = Number of bytes to be allocated	(>0)	
  2390 000104B7 E8C54FFFFF          <1> 	call	allocate_memory_block
  2391 000104BC 0F828FFDFFFF        <1> 	jc	sound_buff_error
  2392                              <1> 
  2393                              <1> 	; set dma buffer address and size parameters
  2394 000104C2 A3[606B0100]        <1> 	mov	[audio_dma_buff], eax ; dma buffer address
  2395 000104C7 890D[646B0100]      <1> 	mov	[audio_dmabuff_size], ecx ; dma buffer size
  2396                              <1> ;	; EAX = Beginning (physical) addr of the allocated mem block
  2397                              <1> ;	; ECX = Num of allocated bytes (rounded up to page borders)
  2398                              <1> ;	cmp	byte [audio_pci], 0 ; AC97 audio controller ?
  2399                              <1> ;	ja	short sndc_init4
  2400                              <1> ;
  2401                              <1> ;	; Sound Blaster 16 uses classic DMA
  2402                              <1> ;	mov	edx, eax
  2403                              <1> ;	add	edx, ecx
  2404                              <1> ;	cmp	edx, 1000000h ; 1st 16 MB
  2405                              <1> ;	jna	short sndc_init4
  2406                              <1> ;
  2407                              <1> ;	; error !
  2408                              <1> ;	; restore Memory Allocation Table Content
  2409                              <1> ;	; EAX = Beginning address (physical)
  2410                              <1> ;	; ECX = Number of bytes to be deallocated
  2411                              <1> ;	call	deallocate_memory_block
  2412                              <1> ;	; reset dma buffer address and size parameters
  2413                              <1> ;	xor	eax, eax ; 0
  2414                              <1> ;	mov	[audio_dma_buff], eax ; 0
  2415                              <1> ;	mov	[audio_dmabuff_size], ecx ; 0
  2416                              <1> ;	jmp	sound_buff_error				
  2417                              <1> ;
  2418                              <1> ;sndc_init4:
  2419 000104CD 803D[416B0100]03    <1> 	cmp	byte [audio_device], 3
  2420                              <1> 	;jne	short sndc_init5
  2421 000104D4 7506                <1> 	jne	short sndc_init14 ; 28/05/2017
  2422 000104D6 E867190000          <1> 	call	set_vt8233_bdl	
  2423                              <1> sndc_init5:
  2424                              <1> 	;sub	eax, eax ; 0
  2425                              <1> 	;mov	[u.r0], eax ; 0 = no error, successful
  2426 000104DB C3                  <1> 	retn
  2427                              <1> sndc_init14:
  2428 000104DC E82E1F0000          <1> 	call	set_ac97_bdl
  2429                              <1> 	;jmp	short sndc_init5
  2430 000104E1 C3                  <1> 	retn
  2431                              <1> 
  2432                              <1> sound_play:
  2433                              <1> 	; FUNCTION = 4 
  2434                              <1> 	; bl = Mode 
  2435                              <1> 	;      bit 0 = mono/stereo (1 = stereo)		
  2436                              <1> 	;      bit 1 = 8 bit / 16 bit (1 = 16 bit)
  2437                              <1> 	; cx = Sampling Rate (Hz)
  2438                              <1> 
  2439                              <1> 	; 13/06/2017
  2440                              <1> 	; Note: Even if Mode bits are not 11b,
  2441                              <1> 	; 	AC'97 Audio Controller (&Codec)
  2442                              <1> 	;	will play audio samples as 16 bit, stereo
  2443                              <1> 	;	samples.
  2444                              <1> 	;	(Program must fill the audio buffer
  2445                              <1> 	;	as required; 8 bit samples must be converted
  2446                              <1> 	;	to 16 bit samples and mono samples must be
  2447                              <1> 	;	converted to stereo samples...)
  2448                              <1> 	; 
  2449                              <1> 	; 28/07/2020
  2450                              <1> 	; 27/07/2020	 	
  2451                              <1> 	; 28/05/2017
  2452                              <1> 	; 15/05/2017, 20/05/2017
  2453                              <1> 	; 21/04/2017, 24/04/2017
  2454                              <1> 	; ... device check at first
  2455 000104E2 A0[416B0100]        <1> 	mov	al, [audio_device]
  2456 000104E7 08C0                <1> 	or	al, al ; 0 ; pc speaker or invalid 
  2457 000104E9 0F84B518FFFF        <1> 	jz	beeper_gfx ; 'video.s' ; temporary !
  2458                              <1> ;	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2459                              <1> ;	je	short snd_play_1
  2460                              <1> ;	cmp	al, 1 ; SB 16
  2461                              <1> ;	jne	soundc_dev_err ; temporary !
  2462                              <1> ;snd_play_0:
  2463                              <1> 	; ... buffer & (buffer) owner check at second
  2464 000104EF 833D[546B0100]00    <1> 	cmp	dword [audio_buffer], 0
  2465 000104F6 0F8655FDFFFF        <1> 	jna	sound_buff_error
  2466 000104FC A0[B3030300]        <1> 	mov	al, [u.uno]
  2467 00010501 3A05[696B0100]      <1> 	cmp	al, [audio_user]
  2468 00010507 0F858FFEFFFF        <1> 	jne	sndc_owner_error
  2469                              <1> 
  2470 0001050D 66890D[726B0100]    <1> 	mov	[audio_freq], cx ; sample frequency (Hertz)
  2471 00010514 88D8                <1> 	mov	al, bl
  2472 00010516 2401                <1> 	and	al, 1 ; mono/stereo (1= stereo)
  2473 00010518 FEC0                <1> 	inc	al ; channels
  2474 0001051A A2[716B0100]        <1> 	mov	[audio_stmo], al ; sound channels (1 or 2)
  2475 0001051F B008                <1> 	mov	al, 8
  2476 00010521 F6C302              <1> 	test	bl, 2 ; bits per sample (1= 16 bit)
  2477 00010524 7402                <1> 	jz	short snd_play_bps
  2478 00010526 D0E0                <1> 	shl	al, 1  
  2479                              <1> snd_play_bps:	
  2480 00010528 A2[706B0100]        <1> 	mov	[audio_bps], al
  2481                              <1> 
  2482                              <1> 	; Transfer ring 3 (user's) audio buffer content to dma buffer
  2483 0001052D 8B3D[606B0100]      <1> 	mov	edi, [audio_dma_buff] ; dma buffer (ring 0)
  2484 00010533 09FF                <1> 	or	edi, edi
  2485 00010535 0F8416FDFFFF        <1> 	jz	sound_buff_error
  2486                              <1> 
  2487                              <1> 	; 27/07/2020
  2488                              <1> 
  2489 0001053B 8B35[586B0100]      <1> 	mov	esi, [audio_p_buffer] ; physical address (ring 3)
  2490                              <1> 	;mov	ecx, [audio_buff_size] ; 15/05/2017
  2491 00010541 8B0D[646B0100]      <1> 	mov	ecx, [audio_dmabuff_size] ; 27/07/2020
  2492                              <1> 	;or	ecx, ecx 
  2493                              <1> 	;jz	sound_buff_error
  2494                              <1> 	; 28/07/2020
  2495 00010547 D1E9                <1> 	shr	ecx, 1  ; dma half buffer size
  2496                              <1> 
  2497 00010549 8035[686B0100]01    <1> 	xor	byte [audio_flag], 1 ;  0 -> 1, 1 -> 0
  2498 00010550 7502                <1> 	jnz	short snd_play_0 ; [audio_flag] = 1
  2499                              <1> 				 ; fill dma half buffer 1
  2500                              <1> 	; [audio_flag] = 0
  2501                              <1> 	
  2502                              <1> 	; fill dma half buffer 2
  2503 00010552 01CF                <1> 	add	edi, ecx
  2504                              <1> 
  2505                              <1> snd_play_0:
  2506                              <1> 	;rep	movsb
  2507 00010554 C1E902              <1> 	shr	ecx, 2  ; convert byte count to dword count
  2508 00010557 F3A5                <1> 	rep	movsd
  2509                              <1> 
  2510                              <1> 	; here, if [audio_flag] = 0, interrupt handler will update
  2511                              <1> 				; dma half buffer 2 
  2512                              <1> 				; (user's audio buffer data will be 
  2513                              <1> 				; copied into dma half buffer 2) 
  2514                              <1> 	;; 20/05/2017
  2515                              <1> 	;mov	byte [audio_flag], 1 ; next half (on next time)
  2516                              <1> 
  2517                              <1> 	; 24/04/2017
  2518 00010559 A0[416B0100]        <1> 	mov	al, [audio_device]
  2519 0001055E 3C03                <1> 	cmp	al, 3 ; VT8233 (VT8237R) 
  2520 00010560 7410                <1> 	je	short snd_play_1
  2521 00010562 3C01                <1> 	cmp	al, 1 ; Sound Blaster 16
  2522 00010564 7512                <1> 	jne	short snd_play_2  ; 28/05/2017
  2523 00010566 E8DF1A0000          <1> 	call	SbInit_play
  2524 0001056B 0F82E7FCFFFF        <1> 	jc	soundc_respond_err
  2525 00010571 C3                  <1> 	retn
  2526                              <1> 
  2527                              <1> snd_play_1:	
  2528 00010572 E802190000          <1> 	call	vt8233_start_play
  2529 00010577 C3                  <1> 	retn
  2530                              <1> 
  2531                              <1> snd_play_2:
  2532                              <1> 	; 28/05/2017
  2533                              <1> 	;cmp	al, 2 ; AC'97
  2534                              <1> 	;jne	short snd_play_3
  2535                              <1> 
  2536 00010578 E8C61E0000          <1> 	call	ac97_start_play
  2537 0001057D C3                  <1> 	retn
  2538                              <1> 
  2539                              <1> ;snd_play_3:
  2540                              <1> ;	;call	hda_start_play
  2541                              <1> ;	retn
  2542                              <1> 
  2543                              <1> sound_pause:
  2544                              <1> 	; FUNCTION = 5
  2545                              <1> 	; Pause
  2546                              <1> 	; 28/05/2017
  2547                              <1> 	; 24/04/2017
  2548                              <1> 	; 22/04/2017
  2549 0001057E E814030000          <1> 	call	snd_dev_check
  2550 00010583 7275                <1> 	jc	short snd_nothing ; temporary.
  2551 00010585 E81A030000          <1> 	call	snd_buf_check
  2552 0001058A 726E                <1> 	jc	short snd_nothing ; temporary.
  2553 0001058C A0[416B0100]        <1> 	mov	al, [audio_device]
  2554 00010591 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2555 00010593 7409                <1> 	je	short snd_pause_1
  2556 00010595 3C01                <1> 	cmp	al, 1 ; Sound Blaster 16
  2557 00010597 750A                <1> 	jne	short snd_pause_2 ; 28/05/2017
  2558 00010599 E98A1C0000          <1> 	jmp	sb16_pause
  2559                              <1> snd_pause_1:
  2560 0001059E E98F190000          <1> 	jmp	vt8233_pause
  2561                              <1> snd_pause_2:
  2562                              <1> 	; 28/05/2017
  2563                              <1> 	;cmp	al, 2 ; AC'97
  2564                              <1> 	;jne	short snd_nothing ; temporary.
  2565 000105A3 E929200000          <1> 	jmp	ac97_pause
  2566                              <1> 
  2567                              <1> sound_continue:
  2568                              <1> 	; FUNCTION = 6
  2569                              <1> 	; Continue to play
  2570                              <1> 	; 28/05/2017
  2571                              <1> 	; 22/04/2017
  2572 000105A8 E8EA020000          <1> 	call	snd_dev_check
  2573 000105AD 724B                <1> 	jc	short snd_nothing ; temporary.
  2574 000105AF E8F0020000          <1> 	call	snd_buf_check
  2575 000105B4 7244                <1> 	jc	short snd_nothing ; temporary.
  2576 000105B6 A0[416B0100]        <1> 	mov	al, [audio_device]
  2577 000105BB 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2578 000105BD 7409                <1> 	je	short snd_cont_1
  2579 000105BF 3C01                <1> 	cmp	al, 1 ; Sound Blaster 16
  2580 000105C1 750A                <1> 	jne	short snd_cont_2 ; 28/05/2017
  2581 000105C3 E9831C0000          <1> 	jmp	sb16_continue
  2582                              <1> snd_cont_1:
  2583 000105C8 E916190000          <1> 	jmp	vt8233_play
  2584                              <1> snd_cont_2:
  2585                              <1> 	; 28/05/2017
  2586                              <1> 	;cmp	al, 2 ; AC'97
  2587                              <1> 	;jne	short snd_nothing ; temporary.
  2588 000105CD E9C71E0000          <1> 	jmp	ac97_play
  2589                              <1> 
  2590                              <1> sound_stop:
  2591                              <1> 	; FUNCTION = 7
  2592                              <1> 	; Stop playing
  2593                              <1> 	; 28/05/2017
  2594                              <1> 	; 24/05/2017
  2595                              <1> 	; 21/04/2017, 22/04/2017, 24/04/2017
  2596 000105D2 E8C0020000          <1> 	call	snd_dev_check
  2597 000105D7 7221                <1> 	jc	short snd_nothing ; temporary.
  2598                              <1> 	;call	snd_buf_check
  2599 000105D9 E8CF020000          <1> 	call	snd_user_check ; 24/05/2017
  2600 000105DE 721A                <1> 	jc	short snd_nothing ; temporary.	
  2601                              <1> 	
  2602 000105E0 A0[416B0100]        <1> 	mov	al, [audio_device]
  2603 000105E5 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2604 000105E7 0F844C180000        <1> 	je	vt8233_stop
  2605                              <1> 	; 28/05/2017
  2606                              <1> 	;ja	short snd_nothing
  2607 000105ED 3C01                <1> 	cmp	al, 1 ; Sound Blaster 16
  2608 000105EF 0F84791C0000        <1> 	je	sb16_stop
  2609                              <1> 	;cmp	al, 2 
  2610                              <1> 	;je	short ac97_stop
  2611 000105F5 E9A91F0000          <1> 	jmp	ac97_stop ; temporary.
  2612                              <1> 	;jmp	hda_stop
  2613                              <1> 
  2614                              <1> snd_nothing:
  2615                              <1> 	; 21/04/2017
  2616 000105FA C3                  <1> 	retn
  2617                              <1> 
  2618                              <1> soundc_reset:
  2619                              <1> 	; FUNCTION = 8
  2620                              <1> 	; Reset Audio Controller
  2621                              <1> 	; 28/05/2017
  2622                              <1> 	; 22/04/2017
  2623 000105FB E897020000          <1> 	call	snd_dev_check
  2624 00010600 72F8                <1> 	jc	snd_nothing ; temporary.
  2625 00010602 E89D020000          <1> 	call	snd_buf_check
  2626 00010607 72F1                <1> 	jc	snd_nothing ; temporary.	
  2627                              <1> 	
  2628 00010609 A0[416B0100]        <1> 	mov	al, [audio_device]
  2629 0001060E 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2630 00010610 0F8428190000        <1> 	je	vt8233_reset
  2631 00010616 77E2                <1> 	ja	short snd_nothing ; temporary.
  2632                              <1> 	;ja	hda_reset	
  2633 00010618 3C01                <1> 	cmp	al, 1 ; Sound Blaster 16
  2634 0001061A 0F8502200000        <1> 	jne	ac97_reset	
  2635 00010620 E89B1C0000          <1> 	call	sb16_reset
  2636 00010625 0F822DFCFFFF        <1> 	jc	soundc_respond_err
  2637 0001062B C3                  <1> 	retn
  2638                              <1> 
  2639                              <1> soundc_cancel:
  2640                              <1> 	; FUNCTION = 9
  2641                              <1> 	; Cancel audio callback service
  2642                              <1> 	; 22/04/2017
  2643 0001062C A0[696B0100]        <1> 	mov	al, [audio_user]	
  2644 00010631 3A05[B3030300]      <1> 	cmp	al, [u.uno]
  2645 00010637 75C1                <1> 	jne	short snd_nothing
  2646                              <1> 	; RESET (audio) INTERRUPT CALLBACK SERVICE
  2647 00010639 8A1D[436B0100]      <1> 	mov	bl, [audio_intr] ; IRQ number
  2648 0001063F A0[B3030300]        <1> 	mov	al, [u.uno]
  2649 00010644 28FF                <1> 	sub	bh, bh ; 0 ; unlink IRQ from user service
  2650 00010646 E8EC020000          <1>  	call	set_irq_callback_service
  2651 0001064B 0F8250FDFFFF        <1> 	jc	sndc_perm_error ; 'permission denied' error
  2652 00010651 C3                  <1> 	retn
  2653                              <1> 
  2654                              <1> sound_dalloc:
  2655                              <1> 	; FUNCTION = 10
  2656                              <1> 	; Deallocate (ring 3) audio buffer
  2657                              <1> 	; 22/04/2017
  2658 00010652 A0[696B0100]        <1> 	mov	al, [audio_user]	
  2659 00010657 3A05[B3030300]      <1> 	cmp	al, [u.uno]
  2660 0001065D 759B                <1> 	jne	short snd_nothing
  2661 0001065F 8B1D[546B0100]      <1> 	mov	ebx, [audio_buffer]
  2662                              <1> 	;or	ebx, ebx
  2663                              <1> 	;jz	short snd_nothing
  2664 00010665 8B0D[5C6B0100]      <1> 	mov	ecx, [audio_buff_size]
  2665 0001066B E86C51FFFF          <1> 	call	deallocate_user_pages
  2666 00010670 31C0                <1> 	xor	eax, eax
  2667 00010672 A3[546B0100]        <1> 	mov	[audio_buffer], eax ; 0
  2668 00010677 A2[696B0100]        <1> 	mov	[audio_user], al ; 0
  2669 0001067C C3                  <1> 	retn
  2670                              <1> 
  2671                              <1> sound_volume:
  2672                              <1> 	; FUNCTION = 11
  2673                              <1> 	; Set sound volume level
  2674                              <1> 	; 28/05/2017
  2675                              <1> 	; 20/05/2017
  2676                              <1> 	; 22/04/2017, 24/04/2017
  2677                              <1> 	; bl = component (0 = master/playback/lineout volume)
  2678                              <1> 	; cl = left channel volume level (0 to 31)
  2679                              <1> 	; ch = right channel volume level (0 to 31)
  2680                              <1> 
  2681 0001067D 80FB80              <1> 	cmp	bl, 80h
  2682 00010680 720E                <1> 	jb	short snd_vol_1
  2683 00010682 0F8772FFFFFF        <1> 	ja	snd_nothing ; temporary.
  2684                              <1> 	; Set volume level for next play (BL>= 80h)
  2685 00010688 66890D[766B0100]    <1> 	mov	[audio_master_volume], cx
  2686 0001068F C3                  <1> 	retn
  2687                              <1> snd_vol_1:
  2688                              <1> 	; set volume level immediate (BL< 80h)
  2689 00010690 80FB00              <1> 	cmp	bl, 0
  2690 00010693 0F8761FFFFFF        <1> 	ja	snd_nothing ; temporary.
  2691                              <1> 
  2692 00010699 E8F9010000          <1> 	call	snd_dev_check
  2693 0001069E 0F8256FFFFFF        <1> 	jc	snd_nothing ; temporary.
  2694 000106A4 E8FB010000          <1> 	call	snd_buf_check
  2695 000106A9 0F824BFFFFFF        <1> 	jc	snd_nothing ; temporary.	
  2696                              <1> 
  2697 000106AF A0[416B0100]        <1> 	mov	al, [audio_device]
  2698 000106B4 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2699 000106B6 0F849B180000        <1> 	je	vt8233_volume
  2700                              <1> 	; 28/05/2017
  2701 000106BC 0F8738FFFFFF        <1> 	ja	snd_nothing ; temporary.
  2702                              <1> 	;ja	hda_volume	
  2703                              <1> 	; Sound Blaster 16
  2704 000106C2 3C01                <1> 	cmp	al, 1 ; SB 16
  2705 000106C4 0F84291B0000        <1> 	je	sb16_volume
  2706 000106CA E9E61D0000          <1> 	jmp	ac97_volume
  2707                              <1> 
  2708                              <1> soundc_disable:
  2709                              <1> 	; FUNCTION = 12 
  2710                              <1> 	; Disable audio device (and unlink DMA memory)
  2711                              <1> 	; 28/05/2017
  2712                              <1> 	; 24/05/2017
  2713                              <1> 	; 22/04/2017
  2714 000106CF E8C3010000          <1> 	call	snd_dev_check
  2715 000106D4 0F8270FBFFFF        <1> 	jc	soundc_dev_err ; temporary.
  2716                              <1> 	;call	snd_buf_check
  2717                              <1> 	;jc	sndc_owner_error ; temporary.
  2718                              <1> 
  2719 000106DA A0[416B0100]        <1> 	mov	al, [audio_device]
  2720 000106DF 3C03                <1> 	cmp	al, 3 ; VIA VT 8237R (vt8233)
  2721 000106E1 7418                <1> 	je	short snd_disable_1
  2722 000106E3 0F8711FFFFFF        <1> 	ja	snd_nothing ; temporary.
  2723 000106E9 3C01                <1> 	cmp	al, 1 ; Sound Blaster 16
  2724 000106EB 7507                <1> 	jne	short snd_disable_0
  2725 000106ED E87C1B0000          <1> 	call	sb16_stop
  2726 000106F2 EB0C                <1> 	jmp	short snd_disable_2
  2727                              <1> snd_disable_0:
  2728 000106F4 E8AA1E0000          <1> 	call	ac97_stop
  2729 000106F9 EB05                <1> 	jmp	short snd_disable_2
  2730                              <1> snd_disable_1:
  2731 000106FB E839170000          <1> 	call	vt8233_stop
  2732                              <1> snd_disable_2:
  2733 00010700 A0[436B0100]        <1> 	mov	al, [audio_intr]
  2734 00010705 29DB                <1> 	sub	ebx, ebx ; 0 = reset
  2735 00010707 E851FAFFFF          <1> 	call	set_dev_IRQ_service
  2736                              <1> 
  2737                              <1> 	;mov	al, [audio_intr]
  2738 0001070C 28E4                <1> 	sub	ah, ah ; 0 = reset
  2739 0001070E E8B5F6FFFF          <1> 	call	set_hardware_int_vector
  2740                              <1> 
  2741 00010713 31C0                <1> 	xor	eax, eax
  2742 00010715 A2[416B0100]        <1> 	mov	byte [audio_device], al
  2743 0001071A A2[436B0100]        <1> 	mov	byte [audio_intr], al
  2744 0001071F 8705[606B0100]      <1> 	xchg	eax, [audio_dma_buff]
  2745                              <1> 	; 24/05/2017
  2746                              <1> 	;or	eax, eax
  2747                              <1> 	;jz	short snd_disable_3
  2748                              <1> 	;cmp	eax, sb16_dma_buffer ; default DMA buffer
  2749                              <1> 	;je	short snd_disable_3
  2750 00010725 803D[406B0100]00    <1> 	cmp	byte [audio_pci], 0 ; AC97 audio controller ?
  2751 0001072C 7612                <1> 	jna	short snd_disable_3
  2752 0001072E C605[406B0100]00    <1> 	mov	byte [audio_pci], 0
  2753                              <1> 	;sub	ecx, ecx
  2754                              <1> 	;xchg	ecx, [audio_dmabuff_size]
  2755 00010735 8B0D[646B0100]      <1> 	mov	ecx, [audio_dmabuff_size]
  2756 0001073B E84E4FFFFF          <1> 	call	deallocate_memory_block
  2757                              <1> snd_disable_3:
  2758 00010740 C3                  <1> 	retn
  2759                              <1> 
  2760                              <1> sound_dma_map:
  2761                              <1> 	; FUNCTION = 13 
  2762                              <1> 	; Map audio dma buff addr to user's buffer addr
  2763                              <1> 	; 12/05/2017
  2764 00010741 21C9                <1> 	and	ecx, ecx
  2765 00010743 0F8408FBFFFF        <1> 	jz	sound_buff_error
  2766 00010749 803D[416B0100]01    <1> 	cmp	byte [audio_device], 1
  2767 00010750 7229                <1> 	jb	short snd_dma_map_1
  2768                              <1> snd_dma_map_0:
  2769 00010752 A1[606B0100]        <1> 	mov	eax, [audio_dma_buff]
  2770 00010757 21C0                <1> 	and	eax, eax
  2771 00010759 7420                <1> 	jz	short snd_dma_map_1
  2772                              <1> 	;
  2773 0001075B 8A1D[696B0100]      <1> 	mov	bl, [audio_user]
  2774 00010761 08DB                <1> 	or	bl, bl
  2775 00010763 7416                <1> 	jz	short snd_dma_map_1
  2776 00010765 3A1D[B3030300]      <1> 	cmp	bl, [u.uno]
  2777 0001076B 0F852BFCFFFF        <1> 	jne	sndc_owner_error
  2778                              <1> 	;
  2779 00010771 8B1D[646B0100]      <1> 	mov	ebx, [audio_dmabuff_size]
  2780 00010777 21DB                <1> 	and	ebx, ebx
  2781 00010779 750A                <1> 	jnz	short snd_dma_map_2
  2782                              <1> snd_dma_map_1:
  2783 0001077B B8[00000200]        <1> 	mov	eax, sb16_dma_buffer
  2784 00010780 BB00000100          <1> 	mov	ebx, 65536
  2785                              <1> snd_dma_map_2:	
  2786 00010785 81C1FF0F0000        <1> 	add	ecx, PAGE_SIZE-1 ; 4095
  2787 0001078B 6681E100F0          <1> 	and	cx, ~PAGE_OFF ; not 4095
  2788 00010790 39D9                <1> 	cmp	ecx, ebx
  2789 00010792 0F87B9FAFFFF        <1> 	ja	sound_buff_error
  2790 00010798 50                  <1> 	push	eax
  2791 00010799 89D3                <1> 	mov	ebx, edx
  2792 0001079B C1E90C              <1> 	shr	ecx, 12 ; byte count to page count
  2793                              <1> 	; eax = physical address of (audio) dma buffer
  2794                              <1> 	; ebx = virtual address of (audio) dma buffer (user's pgdir) 
  2795                              <1> 	; ecx = page count (>0)
  2796 0001079E E85B4FFFFF          <1> 	call	direct_memory_access
  2797 000107A3 58                  <1> 	pop	eax
  2798 000107A4 0F82A7FAFFFF        <1> 	jc	sound_buff_error
  2799 000107AA A3[64030300]        <1> 	mov	[u.r0], eax
  2800 000107AF C3                  <1> 	retn
  2801                              <1> 
  2802                              <1> soundc_info:
  2803                              <1> 	; FUNCTION = 14 
  2804                              <1> 	; Get Audio Controller Info
  2805                              <1> 	; 10/06/2017
  2806                              <1> 	; 05/06/2017
  2807 000107B0 20DB                <1> 	and	bl, bl ; 0
  2808 000107B2 740A                <1> 	jz	short sndc_info_0
  2809                              <1> 	; invalid parameter !
  2810 000107B4 B817000000          <1> 	mov	eax, ERR_INV_PARAMETER ; 23
  2811                              <1> ;sndc_inf_error:
  2812                              <1> ;	mov	[u.r0], eax
  2813                              <1> ;	mov	[u.error], eax
  2814                              <1> ;	jmp	error
  2815 000107B9 E99FFAFFFF          <1> 	jmp	sysaudio_err
  2816                              <1> 
  2817                              <1> sndc_info_0:
  2818 000107BE E8D4000000          <1> 	call	snd_dev_check
  2819 000107C3 0F8281FAFFFF        <1> 	jc	soundc_dev_err
  2820                              <1> 
  2821 000107C9 8B1D[4C6B0100]      <1> 	mov	ebx, [audio_vendor]
  2822 000107CF 8B0D[486B0100]      <1> 	mov	ecx, [audio_dev_id]
  2823                              <1> 	;mov	al,  [audio_device]
  2824 000107D5 3C02                <1> 	cmp	al, 2 ; AC'97 (ICH)
  2825 000107D7 7513                <1> 	jne	short sndc_info_1
  2826                              <1> 	; Intel AC97 (ICH) Audio Controller (=2)	
  2827 000107D9 668B15[7A6B0100]    <1> 	mov	dx, [NABMBAR]
  2828 000107E0 C1E210              <1> 	shl	edx, 16
  2829 000107E3 668B15[786B0100]    <1> 	mov	dx, [NAMBAR]
  2830 000107EA EB07                <1> 	jmp	short sndc_info_2
  2831                              <1> sndc_info_1:
  2832                              <1> 	; 05/06/2017
  2833                              <1> 	; Note: Intel HDA code (here) is not ready yet!
  2834                              <1> 	; !!! SB16 or VT8233 (VT8237R) !!!
  2835 000107EC 0FB715[466B0100]    <1> 	movzx	edx, word [audio_io_base]	
  2836                              <1> sndc_info_2:
  2837 000107F3 88C4                <1> 	mov	ah, al ;  [audio_device]
  2838 000107F5 A0[436B0100]        <1> 	mov	al, [audio_intr] 
  2839                              <1> 
  2840                              <1> 	; EAX = IRQ Number in AL
  2841                              <1> 	;	Audio Device Number in AH 
  2842                              <1> 	; EBX = DEV/VENDOR ID
  2843                              <1> 	;	(DDDDDDDDDDDDDDDDVVVVVVVVVVVVVVVV)
  2844                              <1> 	; ECX = BUS/DEV/FN 
  2845                              <1> 	;	(00000000BBBBBBBBDDDDDFFF00000000)
  2846                              <1> 	; EDX = NABMBAR/NAMBAR (for AC97)
  2847                              <1> 	;	(Low word, DX = NAMBAR address)
  2848                              <1> 	; EDX = Base IO Addr (DX) for SB16 & VT8233
  2849                              <1> 
  2850                              <1> 	; 10/06/2017
  2851 000107FA A3[64030300]        <1> 	mov	[u.r0], eax
  2852 000107FF 8B2D[60030300]      <1> 	mov	ebp, [u.usp]
  2853 00010805 895D10              <1> 	mov	[ebp+16], ebx  ; ebx
  2854 00010808 895514              <1> 	mov	[ebp+20], edx  ; edx
  2855 0001080B 894D18              <1> 	mov	[ebp+24], ecx  ; ecx
  2856                              <1>   			  		
  2857 0001080E C3                  <1>  	retn
  2858                              <1> 
  2859                              <1> sound_data:
  2860                              <1> 	; FUNCTION = 15 
  2861                              <1> 	; Get Current Sound data for graphics
  2862                              <1> 	; 22/06/2017
  2863                              <1> 	;
  2864 0001080F E883000000          <1> 	call	snd_dev_check
  2865 00010814 0F8230FAFFFF        <1> 	jc	soundc_dev_err ; Device not ready !
  2866                              <1> 
  2867 0001081A 80FB00              <1> 	cmp	bl, 0
  2868 0001081D 760A                <1> 	jna	short sound_data_0
  2869                              <1> 
  2870                              <1> 	; Only PCM OUT buffer data is valid for now!
  2871 0001081F B817000000          <1> 	mov	eax, ERR_INV_PARAMETER  ; 23
  2872 00010824 E934FAFFFF          <1> 	jmp	sysaudio_err
  2873                              <1> 
  2874                              <1> sound_data_0:
  2875 00010829 A1[606B0100]        <1> 	mov	eax, [audio_dma_buff]
  2876 0001082E 09C0                <1> 	or	eax, eax
  2877 00010830 0F841BFAFFFF        <1> 	jz	sound_buff_error
  2878                              <1> 
  2879 00010836 803D[416B0100]04    <1> 	cmp	byte [audio_device], 4 ; Intel HDA
  2880 0001083D 744F                <1> 	je	short sound_data_4 ; temporary ! (22/06/2017)
  2881                              <1> 
  2882 0001083F 21C9                <1> 	and	ecx, ecx
  2883                              <1> 	;jnz	short sound_data_1 ; sample tranfer
  2884                              <1> 	
  2885                              <1> 	; Return only DMA Buffer pointer/offset... 
  2886                              <1> 	; (If DMA Buffer has been mapped to user's
  2887                              <1> 	;  memory space; program can get graphics
  2888                              <1> 	;  data by using only this pointer value.)
  2889                              <1> 	   	
  2890                              <1> 	;call	get_dma_buffer_offset
  2891                              <1> 	;; eax = DMA buffer offset
  2892                              <1> 	;;	(!not half buffer offset!)
  2893                              <1> 	;mov	[u.r0], eax
  2894                              <1> 	;retn
  2895                              <1> 
  2896 00010841 0F84531F0000        <1> 	jz	get_dma_buffer_offset	
  2897                              <1> 	
  2898                              <1> sound_data_1:
  2899                              <1> 	;mov	eax, [audio_dmabuff_size]
  2900                              <1> 	;shr	eax, 1 ; half buffer size
  2901                              <1> 	;cmp	ecx, eax
  2902                              <1> 	;ja	short sound_buff_error	
  2903                              <1> 
  2904 00010847 3B0D[646B0100]      <1> 	cmp	ecx, [audio_dmabuff_size]
  2905 0001084D 0F87FEF9FFFF        <1> 	ja	sound_buff_error
  2906                              <1> 
  2907 00010853 89D0                <1> 	mov	eax, edx
  2908 00010855 25FF0F0000          <1> 	and	eax, PAGE_OFF ; 4095 (0FFFh)
  2909 0001085A 81F900100000        <1> 	cmp	ecx, 4096
  2910 00010860 7605                <1> 	jna	short sound_data_2
  2911 00010862 B900100000          <1> 	mov	ecx, 4096 ; max. 1 page
  2912                              <1> sound_data_2:
  2913 00010867 01C8                <1> 	add	eax, ecx
  2914 00010869 3D00100000          <1> 	cmp	eax, 4096
  2915 0001086E 7606                <1> 	jna	short sound_data_3
  2916 00010870 6625FF0F            <1> 	and	ax, PAGE_OFF ; 4095 (0FFFh)
  2917 00010874 29C1                <1> 	sub	ecx, eax
  2918                              <1> 	; here, ECX has been adjusted to fit 
  2919                              <1> 	;	in page border..  (<= 4096, >0)
  2920                              <1> sound_data_3:
  2921 00010876 51                  <1> 	push	ecx
  2922 00010877 52                  <1> 	push	edx
  2923 00010878 89D3                <1> 	mov	ebx, edx 
  2924 0001087A E86D4AFFFF          <1> 	call	get_physical_addr
  2925 0001087F 5A                  <1> 	pop	edx
  2926 00010880 59                  <1> 	pop	ecx
  2927 00010881 0F82CAF9FFFF        <1> 	jc	sound_buff_error	
  2928                              <1> 	
  2929                              <1> 	; eax = physical address of user's buffer
  2930 00010887 89C3                <1> 	mov	ebx, eax  
  2931                              <1> 	; ecx = byte (transfer) count
  2932                              <1> 	;call	get_current_sound_data
  2933                              <1> 	;retn
  2934 00010889 E9691E0000          <1> 	jmp	get_current_sound_data
  2935                              <1> 
  2936                              <1> sound_data_4:
  2937                              <1> 	; Intel HDA code is not ready yet !
  2938                              <1> 	; 22/06/2017
  2939 0001088E 31C0                <1> 	xor	eax, eax
  2940 00010890 48                  <1> 	dec	eax
  2941 00010891 A3[64030300]        <1> 	mov	[u.r0], eax ; 0FFFFFFFFh
  2942 00010896 C3                  <1> 	retn 
  2943                              <1> 
  2944                              <1> snd_dev_check:
  2945                              <1> 	; 10/06/2017
  2946                              <1> 	; 05/06/2017
  2947                              <1> 	; 24/05/2017
  2948                              <1> 	; 22/04/2017
  2949                              <1> 	; 21/04/2017
  2950                              <1> 	; ... device check at first
  2951 00010897 A0[416B0100]        <1> 	mov	al, [audio_device]
  2952 0001089C 3C01                <1> 	cmp	al, 1 ; SB 16
  2953 0001089E 7203                <1> 	jb	short snd_dev_chk_retn ; error !
  2954                              <1> 	;cmp	al, 4 ; Intel HDA
  2955                              <1> 	;ja	short snd_dbchk_stc ; invalid !
  2956                              <1> 	; 10/06/2017
  2957 000108A0 3C05                <1> 	cmp	al, 5
  2958 000108A2 F5                  <1> 	cmc
  2959                              <1> snd_dev_chk_retn:
  2960 000108A3 C3                  <1> 	retn
  2961                              <1> 
  2962                              <1> snd_buf_check:
  2963                              <1> 	; 10/06/2017
  2964                              <1> 	; 22/04/2017
  2965                              <1> 	; 21/04/2017
  2966                              <1> 	; ... buffer & (buffer) owner check at second
  2967 000108A4 833D[546B0100]00    <1> 	cmp	dword [audio_buffer], 0
  2968 000108AB 760D                <1> 	jna	short snd_dbchk_stc
  2969                              <1> snd_user_check:
  2970 000108AD A0[B3030300]        <1> 	mov	al, [u.uno]
  2971 000108B2 3A05[696B0100]      <1> 	cmp	al, [audio_user]
  2972                              <1> 	;jne	short snd_dbchk_stc
  2973                              <1> 	;retn
  2974 000108B8 74E9                <1> 	je	short snd_dev_chk_retn
  2975                              <1> 
  2976                              <1> snd_dbchk_stc:
  2977 000108BA F9                  <1> 	stc
  2978 000108BB C3                  <1> 	retn
  2979                              <1> 
  2980                              <1> sound_update:
  2981                              <1> 	; FUNCTION = 16 
  2982                              <1> 	; bl = 
  2983                              <1> 	;    0 = automatic (sequental) update (with flag switch!)
  2984                              <1> 	;    1 = update dma half buffer 1 (without flag switch!)		
  2985                              <1> 	;    2 = update dma half buffer 2 (without flag switch!)
  2986                              <1> 	;  FFh = get current flag value	
  2987                              <1> 	;      0 = dma half buffer 1 (will be played next)
  2988                              <1> 	;      1 = dma half buffer 2 (will be played next)
  2989                              <1> 	
  2990                              <1> 	; 10/10/2017
  2991                              <1> 	
  2992                              <1> 	; ... device check at first
  2993 000108BC A0[416B0100]        <1> 	mov	al, [audio_device]
  2994 000108C1 08C0                <1> 	or	al, al ; 0 ; pc speaker or invalid 
  2995 000108C3 0F8481F9FFFF        <1> 	jz	soundc_dev_err
  2996                              <1> 
  2997                              <1> 	; ... buffer & (buffer) owner check at second
  2998 000108C9 833D[546B0100]00    <1> 	cmp	dword [audio_buffer], 0
  2999 000108D0 0F867BF9FFFF        <1> 	jna	sound_buff_error
  3000 000108D6 A0[B3030300]        <1> 	mov	al, [u.uno]
  3001 000108DB 3A05[696B0100]      <1> 	cmp	al, [audio_user]
  3002 000108E1 0F85B5FAFFFF        <1> 	jne	sndc_owner_error
  3003                              <1> 
  3004                              <1> 	; Transfer ring 3 (user's) audio buffer content to dma buffer
  3005 000108E7 8B3D[606B0100]      <1> 	mov	edi, [audio_dma_buff] ; dma buffer (ring 0)
  3006 000108ED 09FF                <1> 	or	edi, edi
  3007 000108EF 0F845CF9FFFF        <1> 	jz	sound_buff_error
  3008 000108F5 8B35[586B0100]      <1> 	mov	esi, [audio_p_buffer] ; physical address (ring 3)
  3009 000108FB 8B0D[5C6B0100]      <1> 	mov	ecx, [audio_buff_size]
  3010                              <1> 	
  3011                              <1> 	;movzx	eax, byte [audio_flag]
  3012 00010901 A0[686B0100]        <1> 	mov	al, [audio_flag]
  3013                              <1> 
  3014 00010906 FEC3                <1> 	inc	bl
  3015 00010908 7427                <1> 	jz	short snd_update_3 ; bl = 0FFh
  3016 0001090A FECB                <1> 	dec	bl 
  3017 0001090C 7411                <1> 	jz	short snd_update_0 ; bl = 0
  3018                              <1> 
  3019 0001090E 80FB02              <1> 	cmp	bl, 2
  3020 00010911 7417                <1> 	je	short snd_update_1 ; dma half buffer 2
  3021 00010913 7217                <1> 	jb	short snd_update_2 ; dma half buffer 1
  3022                              <1>  
  3023                              <1> 	; invalid parameter !
  3024 00010915 B817000000          <1> 	mov	eax, ERR_INV_PARAMETER ; 23
  3025                              <1> ;	mov	[u.r0], eax
  3026                              <1> ;	mov	[u.error], eax
  3027                              <1> ;	jmp	error
  3028 0001091A E93EF9FFFF          <1> 	jmp	sysaudio_err
  3029                              <1> 	
  3030                              <1> snd_update_0:
  3031 0001091F 8035[686B0100]01    <1> 	xor	byte [audio_flag], 1 ; update flag !!!
  3032 00010926 3C01                <1> 	cmp	al, 1
  3033 00010928 7202                <1> 	jb	short snd_update_2 ; dma half buffer 1
  3034                              <1> snd_update_1:
  3035                              <1> 	; dma half buffer 2
  3036 0001092A 01CF                <1> 	add	edi, ecx
  3037                              <1> snd_update_2:
  3038                              <1> 	;rep	movsb
  3039 0001092C C1E902              <1> 	shr	ecx, 2
  3040 0001092F F3A5                <1> 	rep	movsd
  3041                              <1> snd_update_3:
  3042 00010931 A3[64030300]        <1> 	mov	[u.r0], eax
  3043                              <1> 
  3044 00010936 C3                  <1> 	retn
  3045                              <1> 	
  3046                              <1> set_irq_callback_service:
  3047                              <1> 	; 03/08/2020
  3048                              <1> 	; 10/06/2017
  3049                              <1> 	; 12/05/2017
  3050                              <1> 	; 24/04/2017
  3051                              <1> 	; 22/04/2017
  3052                              <1> 	; caller: 'syscalbac' or 'sysaudio' or ...
  3053                              <1> 	; 13/04/2017, 14/04/2017, 17/04/2017
  3054                              <1> 	; 24/02/2017, 26/02/2017, 28/02/2017
  3055                              <1> 	; 21/02/2017 - TRDOS 386 (TRDOS v2.0)
  3056                              <1> 	;
  3057                              <1> 	; Link or unlink IRQ callback service to/from user (ring 3)	
  3058                              <1> 	;
  3059                              <1> 	; INPUT ->
  3060                              <1> 	;	If AL = 0, the caller is 'syscalbac';
  3061                              <1> 	;	   otherwise, the caller is 'sysaudio' or ...
  3062                              <1> 	;	   (AL = user number) 
  3063                              <1> 	; 	 
  3064                              <1> 	;	BL = IRQ number (Hardware interrupt request number)
  3065                              <1> 	;	     (0 t0 15 but IRQ 0,1,2,6,8,14,15 are prohibited)
  3066                              <1> 	;	     IRQ numbers 3,4,5,7,9,10,11,12,13 are valid
  3067                              <1> 	;	     (numbers >15 are invalid)
  3068                              <1> 	;
  3069                              <1> 	;	BH = 0 = Unlink IRQ (in BL) from user (ring 3) service
  3070                              <1> 	;	     1 = Link IRQ by using Signal Response Byte method
  3071                              <1> 	;	     2 = Link IRQ by using Callback service method 		
  3072                              <1> 	;	     3 = Link IRQ by using Auto Increment S.R.B. method 	
  3073                              <1> 	;	    >3 = invalid 
  3074                              <1> 	;		 (syscallback version will return to user) 	
  3075                              <1> 	;	
  3076                              <1> 	;	CL = Signal Return/Response Byte value 
  3077                              <1> 	;
  3078                              <1> 	;	If BH = 3, kernel will put a counter value ; 03/08/2020
  3079                              <1> 	;	          (into the S.R.B. addr)
  3080                              <1> 	;		  between 0 to 255. (start value = CL+1)
  3081                              <1> 	;	
  3082                              <1> 	;	NOTE: counter value, for example: even and odd numbers
  3083                              <1> 	;	      may be used for -audio- DMA buffer switch 
  3084                              <1> 	;	      within double buffer method, etc. 		
  3085                              <1> 	;
  3086                              <1> 	;	EDX = Signal return (Response) byte address
  3087                              <1> 	;	       		  - or -
  3088                              <1> 	;	      Interrupt/Callback service/routine address
  3089                              <1> 	; 	
  3090                              <1> 	;	      (virtual address in user's memory space)
  3091                              <1> 	;
  3092                              <1> 	; OUTPUT ->
  3093                              <1> 	;	CF = 0 & EAX = 0 -> Successful setting
  3094                              <1> 	;	CF = 1 & EAX > 0 -> IRQ is prohibited or locked 
  3095                              <1> 	;			by another process
  3096                              <1> 	;		 eax = ERR_PERM_DENIED -> prohibited or locked
  3097                              <1> 	;		 eax = ERR_INV_PARAMETER -> 
  3098                              <1> 	;		       invalid parameter/option or bad address
  3099                              <1> 	;
  3100                              <1> 	; TRDOS 386 - IRQ CALLBACK structures (parameters):
  3101                              <1> 	;	
  3102                              <1> 	;	   [u.irqlock] = 1 word, IRQ flags (0-15) that indicates
  3103                              <1> 	;			which IRQs are locked by (that) user.
  3104                              <1> 	;		        Lock and unlock (by user) will change
  3105                              <1> 	;			these flags or 'terminate process' (sysexit)
  3106                              <1> 	;			will clear these flags and unlock those IRQs.
  3107                              <1> 	;			               
  3108                              <1> 	;		   	Bit 0 is for IRQ 0 and Bit 15 is for IRQ 15
  3109                              <1> 	;
  3110                              <1> 	;	   IRQ(x).owner	 : 1 byte, user, [u.uno], 0 = free (unlocked)	
  3111                              <1> 	;
  3112                              <1> 	;	   IRQ(x).method : 1 byte for callback method & status
  3113                              <1> 	;			   0 = Signal Response Byte method
  3114                              <1> 	;			   1 = Callback service method
  3115                              <1> 	;			   >1 = invalid for current 'syscalback'.
  3116                              <1> 	;			or(+) 80h = IRQ is in use by system (ring 0)
  3117                              <1> 	;			            function (audio etc.) or
  3118                              <1> 	;			   	    a device driver.	   	
  3119                              <1> 	;			(system function will ignore the lock/owner)
  3120                              <1> 	;
  3121                              <1> 	;	   IRQ(x).srb	: 1 byte, Signal Return/Response byte value
  3122                              <1> 	;			  (a fixed value by user or a counter value
  3123                              <1> 	;			 from 0 to 255, which is increased by every
  3124                              <1> 	;			 interrupt just before putting it into 
  3125                              <1> 	;			 the Signal Response byte address
  3126                              <1> 	;			 (This is not used in callback serv method)
  3127                              <1> 	;	    	  
  3128                              <1> 	;	   IRQ(x).addr	: 1 dword
  3129                              <1> 	;			  Signal Response Byte address (physical)
  3130                              <1> 	;			  		-or-
  3131                              <1> 	;			  Callback service address (virtual)
  3132                              <1> 	;
  3133                              <1> 	;	   IRQ(x).dev	: 1 byte
  3134                              <1> 	;			  0 = Default device or kernel function
  3135                              <1> 	;			  		-or-
  3136                              <1> 	;			  1-255 = Assigned device driver number
  3137                              <1> 	;
  3138                              <1> 	;	   (x) = 3,4,5,7,9,10,11,12,13
  3139                              <1> 	;
  3140                              <1> 	
  3141 00010937 80FB0F              <1> 	cmp	bl, 15
  3142 0001093A 7729                <1> 	ja	short scbs_2
  3143                              <1> 	
  3144 0001093C 80FF03              <1> 	cmp	bh, 3
  3145 0001093F 7724                <1> 	ja	short scbs_2  ; invalid parameter
  3146                              <1> 
  3147 00010941 0FB6FB              <1> 	movzx	edi, bl ; save IRQ number
  3148                              <1> 
  3149                              <1> 		;  IRQ 0,1,2,6,8,14,15 are prohibited
  3150                              <1> 	;IRQenum: ; 'trdosk9.s'
  3151                              <1> 	;	db  0,0,0,1,2,3,0,4,0,5,6,7,8,9,0,0
  3152                              <1> 
  3153 00010944 0FB6B7[96160100]    <1> 	movzx	esi, byte [edi+IRQenum] ; IRQ availability 
  3154                              <1> 					; enumeration/index
  3155                              <1> 	;dec	esi
  3156 0001094B 664E                <1> 	dec	si
  3157 0001094D 780F                <1> 	js	short scbs_1 ;  0 -> 0FFFFh  
  3158                              <1> 
  3159                              <1> 	; ESI = IRQ callback parameters index number (0 to 8)
  3160                              <1> 
  3161 0001094F 08FF                <1> 	or	bh, bh
  3162 00010951 7419                <1> 	jz	short scbs_4 ; unlink the IRQ (in BL)
  3163                              <1> 
  3164 00010953 FECF                <1> 	dec	bh
  3165                              <1> 	; bh = method (0 = signal response byte, 1 = callback)
  3166                              <1> 	;	      (2 = auto increment of signal response byte) 
  3167                              <1> 
  3168 00010955 80BE[F26A0100]00    <1> 	cmp	byte [esi+IRQ.owner], 0 ; locked ?
  3169 0001095C 7637                <1> 	jna	short scbs_6	; no... OK...	
  3170                              <1> 
  3171                              <1> scbs_1:
  3172                              <1> 	; permission denied (prohibited IRQ)
  3173 0001095E B80B000000          <1> 	mov	eax, ERR_PERM_DENIED
  3174 00010963 F9                  <1> 	stc
  3175 00010964 C3                  <1> 	retn
  3176                              <1> scbs_2:
  3177 00010965 F9                  <1> 	stc
  3178                              <1> scbs_3:
  3179 00010966 B817000000          <1> 	mov	eax, ERR_INV_PARAMETER
  3180 0001096B C3                  <1> 	retn
  3181                              <1> 
  3182                              <1> scbs_4: ; unlink the requested IRQ (if it belongs to current user)
  3183                              <1> 	; 10/06/2017
  3184                              <1> 	; 22/04/2017
  3185                              <1> 	; 14/04/2017
  3186                              <1> 	; If AL = 0 -> The caller is 'syscalbac'
  3187 0001096C 8AA6[F26A0100]      <1> 	mov	ah, [esi+IRQ.owner]
  3188 00010972 3A25[B3030300]      <1> 	cmp	ah, [u.uno]
  3189 00010978 75E4                <1> 	jne	short scbs_1
  3190                              <1> 
  3191 0001097A FE0D[D6030300]      <1> 	dec	byte [u.irqc] ; decrease IRQ count (in use)
  3192                              <1> 
  3193                              <1> 	;sub	ah, ah
  3194                              <1> 	;mov	[esi+IRQ.owner], ah ; 0 ; free !!!
  3195                              <1> 	;and	byte [esi+IRQ.method], 80h
  3196                              <1> 	;mov	[esi+IRQ.srb], ah ; 0
  3197                              <1> 	;mov	[esi+IRQ.dev], ah ; 0
  3198                              <1> 	;mov	dword [esi+IRQ.addr], 0
  3199                              <1> 	;mov	dword [u.r0], 0
  3200                              <1> 
  3201                              <1> 	;mov	byte [esi+IRQ.owner], 0
  3202                              <1> 
  3203                              <1> 	; 22/04/2017
  3204 00010980 29C0                <1> 	sub	eax, eax
  3205 00010982 8886[F26A0100]      <1> 	mov	[esi+IRQ.owner], al ; 0
  3206                              <1> 	; 10/06/2017
  3207 00010988 8686[046B0100]      <1> 	xchg	al, [esi+IRQ.method]
  3208 0001098E 2480                <1> 	and	al, 80h
  3209 00010990 745E                <1> 	jz	short scbs_12 
  3210                              <1> 	; Audio device must be disabled -later- ! ([IRQ.medhod] = 80h)
  3211                              <1> 
  3212                              <1> ;	cmp	byte [esi+IRQ.method], 80h ; device drv or kernel extension ?
  3213                              <1> ;	jb	short scbs_12 ; bh = 0 reset to default IRQ handler
  3214                              <1> ;
  3215                              <1> ;	and	al, al
  3216                              <1> ;	jz	short  scbs_5  ; the caller is 'syscalbac'
  3217                              <1> ;	; The caller is 'sysaudio' or ...
  3218 00010992 30C0                <1> 	xor	al, al
  3219                              <1> ;	mov	[esi+IRQ.method], al ; 0 ; reset kernel extension flag
  3220                              <1> ;scbs_5:
  3221                              <1> ;	sub	ah, ah
  3222                              <1> 	;mov	[u.r0], eax ; 0
  3223 00010994 C3                  <1> 	retn	
  3224                              <1> 
  3225                              <1> scbs_6:
  3226                              <1> 	; 14/04/2017
  3227 00010995 20C0                <1> 	and	al, al
  3228 00010997 7405                <1> 	jz	short scbs_7  ; the caller is 'syscalbac'
  3229                              <1> 	; AL = user number ([u.uno] or [audio.user] or ...)
  3230                              <1> 	; The caller is 'sysaudio' or ...
  3231                              <1> 	;	
  3232                              <1> 	; bh = method (0 = signal response byte, 1 = callback)
  3233                              <1> 	;	      (2 = auto increment of signal response byte) 
  3234                              <1> 
  3235 00010999 80CF80              <1> 	or	bh, 80h		; Kernel extension flag !
  3236 0001099C EB0A                <1> 	jmp	short scbs_8
  3237                              <1> scbs_7:	
  3238 0001099E 8A86[046B0100]      <1> 	mov	al, [esi+IRQ.method] ; >= 80h = kernel is using this IRQ
  3239 000109A4 2480                <1> 	and	al, 80h ; use only bit 7 (kernel function flag)
  3240 000109A6 08C7                <1> 	or	bh, al		 ; method 
  3241                              <1> 				 ; 0 = signal response byte, 1 = callback
  3242                              <1> 				 ; 2 = auto increment of s.r.b.
  3243                              <1> scbs_8:
  3244 000109A8 A0[B3030300]        <1> 	mov	al, [u.uno] ; user (process) number (1 to 16)
  3245 000109AD 8886[F26A0100]      <1> 	mov	[esi+IRQ.owner], al ; lock the IRQ for user
  3246 000109B3 88BE[046B0100]      <1> 	mov	[esi+IRQ.method], bh
  3247                              <1> 
  3248                              <1> ;	test	bh, 1
  3249                              <1> ;	jnz	short scbs_9 	 ; Callback method, CX will not be used 
  3250                              <1> ;			
  3251                              <1> ;	test	bh, 2		 ; use auto increment (counter) method
  3252                              <1> ;	jz	short scbs_10	 ; (count can be used for buffer switch)
  3253                              <1> ;scbs_9:
  3254                              <1> ;	xor	ecx, ecx ; 0
  3255                              <1> scbs_10:			      	
  3256                              <1> 	;mov	[esi+IRQ.method], bh
  3257 000109B9 888E[0D6B0100]      <1> 	mov	[esi+IRQ.srb], cl
  3258 000109BF C686[FB6A0100]00    <1> 	mov	byte [esi+IRQ.dev], 0 ; device number is always 0 
  3259                              <1> 				 ; for this system call
  3260                              <1> 	;test	bh, 1
  3261 000109C6 80E701              <1> 	and	bh, 1 ; 17/04/2017
  3262 000109C9 7513                <1> 	jnz	short scbs_11	 ; callback method, use virtual address 
  3263                              <1> 
  3264 000109CB 53                  <1> 	push	ebx ; IRQ number (in BL)
  3265 000109CC 89D3                <1> 	mov	ebx, edx
  3266                              <1> 	; ebx = virtual address
  3267                              <1> 	; [u.pgdir] = page directory's physical address
  3268 000109CE FE05[926A0100]      <1> 	inc	 byte [no_page_swap] ; 1 
  3269                              <1> 			; Do not add this page to swap queue
  3270                              <1> 			; and remove it from swap queue if it is
  3271                              <1> 			; on the queue.
  3272 000109D4 E81349FFFF          <1> 	call	get_physical_addr
  3273 000109D9 5B                  <1> 	pop	ebx
  3274 000109DA 728A                <1> 	jc	scbs_3 ; invalid address !
  3275                              <1> 	; eax = physical address of the virtual address in user's space
  3276 000109DC 89C2                <1> 	mov	edx, eax
  3277                              <1> scbs_11:
  3278 000109DE 66C1E602            <1> 	shl	si, 2		; byte (index) to dword (offset)
  3279 000109E2 8996[166B0100]      <1> 	mov	[esi+IRQ.addr], edx
  3280                              <1> 
  3281 000109E8 FE05[D6030300]      <1> 	inc	byte [u.irqc]	; increase IRQ (in use) count
  3282                              <1> 
  3283 000109EE FEC7                <1> 	inc	 bh ; 17/04/2017
  3284                              <1> 	; bh > 0 -> set to requested IRQ handler (IRQ_u_list)
  3285                              <1> scbs_12:
  3286 000109F0 88D8                <1> 	mov	al, bl ; IRQ number
  3287 000109F2 88FC                <1> 	mov	ah, bh ; 0 = reset, >0 = set
  3288 000109F4 E8CFF3FFFF          <1> 	call	set_hardware_int_vector
  3289                              <1> 
  3290 000109F9 31C0                <1> 	xor	eax, eax
  3291                              <1> 	;mov 	[u.r0], eax ; 0	
  3292                              <1> 
  3293 000109FB C3                  <1> 	retn	; return with success (cf=0, eax=0)
  3294                              <1> 
  3295                              <1> 
  3296                              <1> sysdma: ; DMA FUNCTIONS
  3297                              <1> 	; 02/09/2017
  3298                              <1> 	; 28/08/2017
  3299                              <1> 	; 20/08/2017 - TRDOS 386 (TRDOS v2.0)
  3300                              <1> 	;
  3301                              <1> 	; Inputs:
  3302                              <1> 	;	BH = 0 -> Allocate DMA buffer
  3303                              <1> 	;	   BL = 0 -> Use the system's default DMA
  3304                              <1> 	;		     (SB16) Buffer
  3305                              <1> 	;	        Buffer Size (max.) = 65536 bytes
  3306                              <1> 	;	   BL > 0 -> Allocate (a new) DMA buffer
  3307                              <1>  	;	   ECX = DMA Buffer Size in bytes (<=128KB)
  3308                              <1> 	;	   EDX = Virtual Address of DMA buffer 	
  3309                              <1> 	;		
  3310                              <1> 	;	BH = 1 -> Initialize (Start) DMA service
  3311                              <1> 	;	     BL, bit 0 to 3 = Channel Number (0 to 7)	
  3312                              <1> 	;	     BL, bit 7 = Auto Initialized Mode 
  3313                              <1> 	;			(If bit 7 is set)
  3314                              <1> 	;		 bit 6 = Record (read) mode (0= playback)
  3315                              <1> 	;	     ECX = byte count (0 = use dma buffer size)
  3316                              <1> 	;	     EDX = physical buffer address
  3317                              <1> 	;	     	   (0 = use dma buffer -start- address)		
  3318                              <1> 	;
  3319                              <1> 	;	BH = 2 -> Get Current DMA Buffer Offset
  3320                              <1> 	;	     BL = DMA channel number	
  3321                              <1> 	;		
  3322                              <1> 	;	BH = 3 -> Get Current DMA count down value
  3323                              <1> 	;	     BL = DMA channel number (0 tO 7)	
  3324                              <1> 	;
  3325                              <1> 	;	BH = 4 -> Get Current DMA channel (in progress)
  3326                              <1> 	;
  3327                              <1> 	;	BH = 5 -> Get System's Default DMA Buffer Address
  3328                              <1> 	;
  3329                              <1> 	;	BH = 6 -> Get Current DMA Buffer Address	
  3330                              <1> 	;
  3331                              <1> 	;	BH = 7 -> Stop DMA service
  3332                              <1> 	;
  3333                              <1> 	;
  3334                              <1> 	; Outputs:
  3335                              <1> 	;
  3336                              <1> 	;	For BH = 0 ; Allocate DMA buffer
  3337                              <1> 	;	    EAX = Physical address of DMA buffer
  3338                              <1> 	;	    ECX = Allocated buffer size in bytes
  3339                              <1> 	;		  - page count * 4096 -
  3340                              <1> 	;		  (may be bigger than requested)	
  3341                              <1> 	;	    If BL input > 0,
  3342                              <1> 	;	       'sysalloc:' system call will be used with
  3343                              <1>   	;	       EBX (for 'sysalloc') = EDX (for 'sysdma')
  3344                              <1> 	;	       ECX is same, byte count (buffer size)
  3345                              <1> 	;	       EDX = 1024*1024*16 ; 16 MB upper limit	 		        	 
  3346                              <1> 	;	    If BL input = 0,
  3347                              <1> 	;	       Default DMA buffer (SB16 buffer) will be
  3348                              <1> 	;	       checked and if it is free, it's address
  3349                              <1> 	;	       will be returned in EAX and it's size
  3350                              <1> 	;	       will be returned in ECX (as 65536)
  3351                              <1> 	;
  3352                              <1> 	;	    If CF = 1, error code is in EAX
  3353                              <1> 	;	       EAX = -1 ; DMA buffer allocation error! 		
  3354                              <1> 	;	       EAX = 11 ; 'Permission Denied' error !
  3355                              <1> 	;
  3356                              <1> 	;	       Note: 'sysalloc' error return method
  3357                              <1> 	;		      will be applied if BL input > 0 !		
  3358                              <1> 	;
  3359                              <1> 	; 	 For BH = 1 ; Initialize (Start) DMA
  3360                              <1> 	;	     EAX = 0 (Successful)	
  3361                              <1> 	;	     If CF = 1, error code is in EAX
  3362                              <1> 	;
  3363                              <1> 	; 	 For BH = 2 ; Get Current DMA Buffer Offset
  3364                              <1> 	;	     EAX = DMA Buffer Offset (in bytes)
  3365                              <1> 	;	     ;
  3366                              <1> 	;	      AX = DMA buffer offset
  3367                              <1> 	;	     EAX bits 16 to 23 = Page register value
  3368                              <1> 	;		   	
  3369                              <1> 	; 	 For BH = 3 ; Get Current DMA count down value
  3370                              <1> 	;	     EAX = Count down value (remain bytes)
  3371                              <1> 	;	
  3372                              <1> 	;	 For BH = 4 ; Get Current DMA channel (in progress)
  3373                              <1> 	;	     EAX = DMA channel number (0 to 7)
  3374                              <1> 	;		AH = 0 if the owner is the caller process
  3375                              <1> 	;		AH > 0 if the dma channel is in use by
  3376                              <1> 	;		       another user/process
  3377                              <1> 	;	     EAX = -1 (0FFFFFFFFh) 
  3378                              <1> 	;		    if DMA service is not in use	    		
  3379                              <1> 	;	 	    (stopped or not initialized/started)	
  3380                              <1> 	;
  3381                              <1> 	;	 For BH = 5 ; Get System's Default DMA Buff Addr
  3382                              <1> 	;	     EAX = Default DMA Buffer Address (Physical)
  3383                              <1> 	;		 = offset 'sb16_dma_buffer:'	
  3384                              <1> 	;	     ECX = Buffer size
  3385                              <1> 	;		 = 65536 
  3386                              <1> 	;
  3387                              <1> 	;	 For BH = 6 ; Get Current DMA Buffer Address
  3388                              <1> 	;	     EAX = Current DMA buffer address (Physical)
  3389                              <1> 	;	     ECX = Current DMA buffer size (setting value)	   		  	 		
  3390                              <1> 	;	     Note: These values are for current dma channel
  3391                              <1> 	;		   settings for the user/process
  3392                              <1> 	;	     ** For now (for current TRDOS 386 version)
  3393                              <1> 	;		only one user/process can use only one
  3394                              <1> 	;		dma channel & one dma buffer at same time
  3395                              <1> 	;		(no multi tasking on DMA service) !!! **
  3396                              <1> 	;	     (Once, current DMA user must stop it's own DMA
  3397                              <1> 	;	      DMA service, than another user/program 
  3398                              <1> 	;	      can use DMA service with same dma channel 
  3399                              <1> 	;	      or with another DMA channel.)	 			      		
  3400                              <1> 	;
  3401                              <1> 	;	 For BH = 7 ; Stop DMA service (for current user
  3402                              <1> 	;	     and current DMA channel)	
  3403                              <1> 	;	     EAX = 0 ; successful
  3404                              <1> 	;	     CF = 1 & EAX > 0 (= -1) -> Error		
  3405                              <1> 
  3406 000109FC 80FF07              <1> 	cmp	bh, 7
  3407 000109FF 7612                <1> 	jna	short sysdma_0
  3408                              <1> 
  3409                              <1> sysdma_err:
  3410 00010A01 31C0                <1> 	xor	eax, eax
  3411 00010A03 48                  <1> 	dec	eax ; -1
  3412                              <1> sysdma_perm_err:
  3413 00010A04 A3[64030300]        <1> 	mov	[u.r0], eax
  3414 00010A09 A3[C8030300]        <1> 	mov	[u.error], eax ; DMA service error !
  3415 00010A0E E92FBDFFFF          <1> 	jmp	error
  3416                              <1> 
  3417                              <1> sysdma_0:
  3418 00010A13 08FF                <1> 	or	bh, bh
  3419 00010A15 0F85BA000000        <1> 	jnz	sysdma_1
  3420                              <1> 	
  3421 00010A1B 20DB                <1> 	and	bl, bl
  3422 00010A1D 7416                <1> 	jz	short sysdma_01
  3423                              <1> 
  3424                              <1> 	; redirect system call to 'sysalloc'
  3425 00010A1F 89D3                <1> 	mov	ebx, edx ; virtual address of DMA buffer
  3426                              <1> 	;ecx = Buffer size in bytes
  3427                              <1> 	; DMA buffer address <= 16MB upper limit
  3428 00010A21 BA00000001          <1> 	mov	edx, 1024*1024*16 ; 16MB limit for DMA buff
  3429                              <1> 
  3430 00010A26 C705[846F0100]FFFF- <1> 	mov	dword [dma_addr], 0FFFFFFFFh ; -1
  3430 00010A2E FFFF                <1>
  3431                              <1> 
  3432 00010A30 E99DE5FFFF          <1> 	jmp	sysalloc
  3433                              <1> 
  3434                              <1> sysdma_01:
  3435 00010A35 B8[00000200]        <1> 	mov	eax, sb16_dma_buffer
  3436                              <1> 
  3437 00010A3A 803D[416B0100]01    <1> 	cmp	byte [audio_device], 1
  3438 00010A41 722A                <1> 	jb	short sysdma_03
  3439                              <1> 
  3440 00010A43 3B05[606B0100]      <1> 	cmp	eax, [audio_dma_buff]
  3441 00010A49 7507                <1> 	jne	short sysdma_02
  3442                              <1> 
  3443                              <1> sysdma_0_err:
  3444 00010A4B B80B000000          <1> 	mov	eax, ERR_PERM_DENIED
  3445 00010A50 EBB2                <1> 	jmp	short sysdma_perm_err
  3446                              <1> 
  3447                              <1> sysdma_02:
  3448                              <1> 	; Only one user is permitted for audio/dma functions
  3449                              <1> 
  3450 00010A52 833D[606B0100]00    <1> 	cmp	dword [audio_dma_buff], 0
  3451 00010A59 7612                <1> 	jna	short sysdma_03
  3452                              <1> 
  3453 00010A5B 8A1D[696B0100]      <1> 	mov	bl, [audio_user]
  3454 00010A61 08DB                <1> 	or	bl, bl
  3455 00010A63 7408                <1> 	jz	short sysdma_03
  3456                              <1> 
  3457 00010A65 3A1D[B3030300]      <1> 	cmp	bl, [u.uno]
  3458 00010A6B 75DE                <1> 	jne	short sysdma_0_err
  3459                              <1> 
  3460                              <1> sysdma_03: 
  3461 00010A6D 8A1D[816F0100]      <1> 	mov	bl, [dma_user]
  3462 00010A73 20DB                <1> 	and	bl, bl
  3463 00010A75 750E                <1> 	jnz	short sysdma_04
  3464                              <1> 	
  3465 00010A77 8A1D[B3030300]      <1> 	mov	bl, [u.uno]
  3466 00010A7D 881D[816F0100]      <1> 	mov	[dma_user], bl
  3467                              <1> 
  3468 00010A83 EB15                <1> 	jmp	short sysdma_05
  3469                              <1> 
  3470                              <1> sysdma_04:
  3471 00010A85 8B35[846F0100]      <1> 	mov	esi, [dma_addr]
  3472 00010A8B 21F6                <1> 	and	esi, esi
  3473 00010A8D 740B                <1> 	jz	short sysdma_05
  3474                              <1> 
  3475 00010A8F 46                  <1> 	inc	esi ; -1 -> 0
  3476 00010A90 7408                <1> 	jz	short sysdma_05
  3477                              <1> 
  3478 00010A92 3A1D[B3030300]      <1> 	cmp	bl, [u.uno]
  3479 00010A98 75B1                <1> 	jne	short sysdma_0_err
  3480                              <1> 	
  3481                              <1> sysdma_05:
  3482                              <1> 	; edx = virtual address (user's buffer address)
  3483                              <1> 	; 
  3484 00010A9A 81F900000100        <1> 	cmp	ecx, 65536   ; byte count (buffer size)
  3485 00010AA0 0F875BFFFFFF        <1> 	ja	sysdma_err	
  3486                              <1> 	;
  3487 00010AA6 81C1FF0F0000        <1> 	add	ecx, PAGE_SIZE-1 ; 4095
  3488 00010AAC 6681E100F0          <1> 	and	cx, ~PAGE_OFF ; not 4095
  3489                              <1> 	;cmp	ecx, 65536
  3490                              <1> 	;ja	sysdma_err ;
  3491 00010AB1 51                  <1> 	push	ecx	; buffer size (allocated pages * 4096) 
  3492 00010AB2 50                  <1> 	push	eax	; offset sb16_dma_buffer
  3493 00010AB3 89D3                <1> 	mov	ebx, edx
  3494 00010AB5 C1E90C              <1> 	shr	ecx, 12 ; byte count to page count
  3495                              <1> 	; eax = physical address of (audio) dma buffer
  3496                              <1> 	; ebx = virtual address of (audio) dma buffer (user's pgdir) 
  3497                              <1> 	; ecx = page count (>0)
  3498 00010AB8 E8414CFFFF          <1> 	call	direct_memory_access
  3499 00010ABD 58                  <1> 	pop	eax
  3500 00010ABE 59                  <1> 	pop	ecx
  3501 00010ABF 0F823CFFFFFF        <1> 	jc	sysdma_err
  3502                              <1> 
  3503 00010AC5 A3[846F0100]        <1> 	mov	[dma_addr], eax
  3504 00010ACA 890D[886F0100]      <1> 	mov	[dma_size], ecx ; dma buffer size (in bytes)
  3505                              <1> 
  3506                              <1> 	;mov	[u.r0], eax ; DMA Buffer Address (Physical)
  3507                              <1> 
  3508                              <1> 	;mov	ebp, [u.usp]  ; ebp points to user's registers
  3509                              <1> 	;mov	[ebp+24], ecx ; return to user with ecx value
  3510                              <1> 
  3511                              <1> 	;jmp	sysret
  3512                              <1> 
  3513                              <1> 	; 28/08/2017
  3514 00010AD0 E9C4000000          <1> 	jmp	sysdma_51
  3515                              <1> 
  3516                              <1> sysdma_1:
  3517 00010AD5 80FF01              <1> 	cmp	bh, 1
  3518 00010AD8 0F87A6000000        <1> 	ja	sysdma_5
  3519                              <1> 
  3520 00010ADE F6C340              <1> 	test	bl, 40h	; record (read) mode -BL, bit 6-
  3521 00010AE1 0F851AFFFFFF        <1> 	jnz	sysdma_err ; not ready yet!
  3522                              <1> 
  3523 00010AE7 A1[846F0100]        <1> 	mov	eax, [dma_addr] ; physical address of dma buffer
  3524 00010AEC 21C0                <1> 	and	eax, eax
  3525 00010AEE 0F840DFFFFFF        <1> 	jz	sysdma_err
  3526                              <1> 
  3527 00010AF4 09D2                <1> 	or	edx, edx
  3528 00010AF6 7504                <1> 	jnz	short sysdma_11
  3529                              <1> 
  3530 00010AF8 89C2                <1> 	mov	edx, eax
  3531 00010AFA EB08                <1> 	jmp	short sysdma_12	
  3532                              <1> sysdma_11:
  3533 00010AFC 39C2                <1> 	cmp	edx, eax
  3534 00010AFE 0F82FDFEFFFF        <1> 	jb	sysdma_err
  3535                              <1> sysdma_12:
  3536 00010B04 21C9                <1> 	and	ecx, ecx
  3537 00010B06 7508                <1> 	jnz	short sysdma_13
  3538                              <1> 
  3539 00010B08 8B0D[886F0100]      <1> 	mov	ecx, [dma_size]
  3540 00010B0E EB0C                <1> 	jmp	short sysdma_14
  3541                              <1> sysdma_13:
  3542 00010B10 3B0D[886F0100]      <1> 	cmp	ecx, [dma_size]
  3543 00010B16 0F87E5FEFFFF        <1> 	ja	sysdma_err
  3544                              <1> sysdma_14:
  3545 00010B1C 89C6                <1> 	mov	esi, eax
  3546 00010B1E 0335[886F0100]      <1> 	add	esi, [dma_size]
  3547                              <1> 
  3548 00010B24 89D0                <1> 	mov	eax, edx
  3549 00010B26 01C8                <1> 	add	eax, ecx
  3550 00010B28 0F82D3FEFFFF        <1> 	jc	sysdma_err ; 02/09/2017	
  3551                              <1> 		
  3552 00010B2E 39F0                <1> 	cmp	eax, esi
  3553 00010B30 0F87CBFEFFFF        <1> 	ja	sysdma_err
  3554                              <1> 
  3555 00010B36 8B3D[606B0100]      <1> 	mov	edi, [audio_dma_buff]
  3556 00010B3C 8B35[846F0100]      <1> 	mov	esi, [dma_addr]
  3557                              <1> 
  3558 00010B42 09FF                <1> 	or	edi, edi
  3559 00010B44 7424                <1> 	jz	short sysdma_16
  3560                              <1> 	
  3561 00010B46 803D[416B0100]01    <1> 	cmp	byte [audio_device], 1
  3562 00010B4D 7208                <1> 	jb	short sysdma_15
  3563                              <1> 
  3564                              <1> 	; Sound Blaster 16
  3565 00010B4F 39FE                <1> 	cmp	esi, edi
  3566 00010B51 0F84F4FEFFFF        <1> 	je	sysdma_0_err ; permmission denied !
  3567                              <1> 
  3568                              <1> sysdma_15:
  3569 00010B57 C605[836F0100]48    <1> 	mov	byte [dma_mode], 48h ; single mode playback	
  3570                              <1> 
  3571 00010B5E F6C380              <1> 	test	bl, 80h ; DMA mode - BL, bit 7, auto init -
  3572 00010B61 7407                <1> 	jz	short sysdma_16	
  3573                              <1> 	; Auto initialized playback (write) mode
  3574 00010B63 8005[836F0100]10    <1> 	add	byte [dma_mode], 10h ; = 58h
  3575                              <1> sysdma_16:
  3576 00010B6A 80E307              <1> 	and	bl, 07h
  3577 00010B6D 881D[826F0100]      <1> 	mov	[dma_channel], bl
  3578 00010B73 8915[8C6F0100]      <1> 	mov	[dma_start], edx
  3579 00010B79 890D[906F0100]      <1> 	mov	[dma_count], ecx
  3580                              <1> 	 
  3581                              <1> 	; 28/08/2017
  3582                              <1> 	;call	dma_init
  3583                              <1> 	;jmp	sysret
  3584 00010B7F E94B010000          <1> 	jmp	dma_init
  3585                              <1> 
  3586                              <1> sysdma_5:
  3587 00010B84 80FF05              <1> 	cmp	bh, 5
  3588 00010B87 7223                <1> 	jb	short sysdma_3
  3589 00010B89 0F87CE000000        <1> 	ja	sysdma_6	
  3590                              <1> 
  3591                              <1> 	; Get the system's default dma buffer addr and size
  3592 00010B8F B8[00000200]        <1> 	mov	eax, sb16_dma_buffer
  3593 00010B94 B900000100          <1> 	mov	ecx, 65536 ; Buffer size in bytes
  3594                              <1> 
  3595                              <1> sysdma_51:
  3596                              <1> 	; 0 = there is not a dma buffer (in use or available)
  3597 00010B99 A3[64030300]        <1> 	mov	[u.r0], eax
  3598                              <1> 
  3599 00010B9E 8B2D[60030300]      <1> 	mov	ebp, [u.usp]  ; ebp points to user's registers
  3600 00010BA4 894D18              <1> 	mov	[ebp+24], ecx ; return to user with ecx value
  3601                              <1> 
  3602 00010BA7 E9B6BBFFFF          <1> 	jmp	sysret
  3603                              <1> 
  3604                              <1> sysdma_3:
  3605 00010BAC 80FF03              <1> 	cmp	bh, 3
  3606 00010BAF 7231                <1> 	jb	short sysdma_2
  3607 00010BB1 776B                <1> 	ja	short sysdma_4
  3608                              <1> 
  3609                              <1> 	; Get current dma count down value (remain bytes)
  3610                              <1> 	; 28/08/2017
  3611 00010BB3 0FB635[826F0100]    <1> 	movzx	esi, byte [dma_channel]
  3612 00010BBA 0FB696[CE160100]    <1> 	movzx	edx, byte [dma_flip+esi]
  3613 00010BC1 EE                  <1> 	out	dx, al			; flip-flop clear
  3614 00010BC2 8A96[AE160100]      <1> 	mov	dl, [dma_cnt+esi] ; dma count register addr
  3615 00010BC8 EC                  <1> 	in	al, dx
  3616 00010BC9 0FB6D8              <1> 	movzx	ebx, al	
  3617 00010BCC EC                  <1> 	in	al, dx
  3618 00010BCD 88C7                <1> 	mov     bh, al
  3619                              <1> 	
  3620 00010BCF 6683FE04            <1> 	cmp	si, 4 ; channel number ?
  3621 00010BD3 7202                <1> 	jb	short sysdma_31 ; 8 bit dma channel
  3622                              <1> 
  3623 00010BD5 D1E3                <1> 	shl	ebx, 1	; word count to byte count
  3624                              <1> 
  3625                              <1> sysdma_31:
  3626 00010BD7 891D[64030300]      <1> 	mov	[u.r0], ebx
  3627                              <1> 
  3628 00010BDD E980BBFFFF          <1> 	jmp	sysret	
  3629                              <1> 
  3630                              <1> sysdma_2:
  3631                              <1> 	; Get current dma buffer offset (& page)
  3632                              <1> 	; 28/08/2017
  3633 00010BE2 0FB635[826F0100]    <1> 	movzx	esi, byte [dma_channel]
  3634 00010BE9 0FB696[CE160100]    <1> 	movzx	edx, byte [dma_flip+esi]
  3635 00010BF0 EE                  <1> 	out	dx, al			; flip-flop clear
  3636 00010BF1 8A96[A6160100]      <1> 	mov	dl, [dma_adr+esi]
  3637 00010BF7 EC                  <1> 	in	al, dx			; get dma position
  3638 00010BF8 0FB6D8              <1> 	movzx	ebx, al
  3639 00010BFB EC                  <1> 	in	al, dx			
  3640 00010BFC 88C7                <1> 	mov	bh, al
  3641                              <1> 
  3642 00010BFE 6683FE04            <1> 	cmp	si, 4 ; channel number ?
  3643 00010C02 7202                <1> 	jb	short sysdma_21 ; 8 bit dma channel
  3644                              <1> 
  3645 00010C04 D1E3                <1> 	shl	ebx, 1	; word offset to byte offset
  3646                              <1> 
  3647                              <1> sysdma_21:
  3648 00010C06 891D[64030300]      <1> 	mov	[u.r0], ebx
  3649                              <1> 
  3650 00010C0C 8A96[B6160100]      <1> 	mov	dl, [dma_page+esi]
  3651 00010C12 EC                  <1> 	in	al, dx			; get dma page
  3652                              <1> 
  3653                              <1> 	;add	[u.ro+2], al
  3654 00010C13 0805[66030300]      <1> 	or	[u.r0+2], al
  3655                              <1> 
  3656 00010C19 E944BBFFFF          <1> 	jmp	sysret
  3657                              <1> 
  3658                              <1> sysdma_4:
  3659                              <1> 	; Get current DMA channel number
  3660                              <1> 	; 28/08/2017
  3661 00010C1E 8A25[816F0100]      <1> 	mov	ah, [dma_user]
  3662 00010C24 20E4                <1> 	and	ah, ah
  3663 00010C26 750F                <1> 	jnz	short sysdma_42
  3664                              <1> 
  3665                              <1> sysdma_41:	
  3666                              <1> 	; Not a valid dma channel (in use)
  3667 00010C28 C705[64030300]FFFF- <1> 	mov	dword [u.r0], -1 ; 0FFFFFFFFh
  3667 00010C30 FFFF                <1>
  3668 00010C32 E92BBBFFFF          <1> 	jmp	sysret
  3669                              <1> 
  3670                              <1> sysdma_42:
  3671 00010C37 8B35[846F0100]      <1> 	mov	esi, [dma_addr]
  3672 00010C3D 21F6                <1> 	and	esi, esi
  3673 00010C3F 74E7                <1> 	jz	short sysdma_41
  3674                              <1> 
  3675 00010C41 46                  <1> 	inc	esi ; -1 -> 0
  3676 00010C42 74E4                <1> 	jz	short sysdma_41
  3677                              <1> 
  3678 00010C44 A0[826F0100]        <1> 	mov	al, [dma_channel]
  3679                              <1> 
  3680 00010C49 3A25[B3030300]      <1> 	cmp	ah, [u.uno]
  3681 00010C4F 7502                <1> 	jne	short sysdma_43
  3682                              <1> 
  3683 00010C51 30E4                <1> 	xor	ah, ah ; DMA channel in use by current user
  3684                              <1> 
  3685                              <1> sysdma_43:
  3686 00010C53 A3[64030300]        <1> 	mov	[u.r0], eax ; AL = dma channel number
  3687                              <1> 			    ; AH > 0 if the the channel
  3688                              <1> 			    ; in use by another user/process
  3689 00010C58 E905BBFFFF          <1> 	jmp	sysret
  3690                              <1> 
  3691                              <1> sysdma_6:
  3692 00010C5D 80FF06              <1> 	cmp	bh, 6
  3693 00010C60 7710                <1> 	ja	short sysdma_7
  3694                              <1> 
  3695                              <1> 	; 28/08/2017
  3696                              <1> 	; Get current DMA buffer addr and size
  3697 00010C62 A1[846F0100]        <1> 	mov	eax, [dma_addr] ; dma buffer address
  3698 00010C67 8B0D[886F0100]      <1> 	mov	ecx, [dma_size] ; dma buffer size (in bytes)
  3699                              <1> 
  3700 00010C6D E927FFFFFF          <1> 	jmp	sysdma_51
  3701                              <1> 
  3702                              <1> sysdma_7:
  3703                              <1> 	; DMA service STOP
  3704 00010C72 A0[B3030300]        <1> 	mov	al, [u.uno]
  3705 00010C77 3A05[816F0100]      <1> 	cmp	al, [dma_user]
  3706 00010C7D 751D                <1> 	jne	short sysdma_72
  3707                              <1> 	
  3708 00010C7F 28C0                <1> 	sub	al, al ; 0
  3709                              <1> 
  3710 00010C81 A2[816F0100]        <1> 	mov	[dma_user], al ; clear user
  3711                              <1> 
  3712 00010C86 8605[836F0100]      <1> 	xchg	al, [dma_mode]
  3713 00010C8C 20C0                <1> 	and	al, al
  3714                              <1> 	;jz	short sysdma_err
  3715 00010C8E 7527                <1> 	jnz	short sysdma_73	
  3716                              <1> 
  3717                              <1> sysdma_71:
  3718 00010C90 31C0                <1> 	xor	eax, eax
  3719 00010C92 A3[64030300]        <1> 	mov	[u.r0], eax; 0
  3720 00010C97 E9C6BAFFFF          <1> 	jmp	sysret
  3721                              <1> 
  3722                              <1> sysdma_72:
  3723                              <1> 	; 28/08/2017
  3724 00010C9C 803D[816F0100]00    <1> 	cmp	byte [dma_user], 0
  3725 00010CA3 76EB                <1> 	jna	short sysdma_71 ; Nothing to do !
  3726                              <1> 
  3727 00010CA5 833D[846F0100]00    <1> 	cmp	dword [dma_addr], 0
  3728 00010CAC 0F8799FDFFFF        <1> 	ja	sysdma_0_err
  3729                              <1> 	
  3730 00010CB2 A2[816F0100]        <1> 	mov	[dma_user], al ; reset to current user
  3731                              <1> 
  3732                              <1> sysdma_73:
  3733                              <1> 	; 28/08/2017
  3734 00010CB7 0FB635[826F0100]    <1> 	movzx	esi, byte [dma_channel]
  3735 00010CBE 0FB696[BE160100]    <1> 	movzx	edx, byte [dma_mask+esi]
  3736 00010CC5 A0[826F0100]        <1> 	mov	al, [dma_channel]
  3737 00010CCA 0C04                <1> 	or	al, 4
  3738 00010CCC EE                  <1> 	out	dx, al
  3739                              <1> 
  3740 00010CCD EBC1                <1> 	jmp	short sysdma_71
  3741                              <1> 
  3742                              <1> dma_init:
  3743                              <1> 	; 28/08/2017
  3744                              <1> 	; 20/08/2017
  3745                              <1> 	; DMA initialization
  3746                              <1> 	; 14/08/2017
  3747                              <1> 	; 03/08/2017, 06/08/2017, 08/08/2017
  3748                              <1> 	; 02/07/2017, 13/07/2017, 16/07/2017, 30/07/2017
  3749                              <1> 	; (Derived from 'DMA_INIT' procedure in SB16MOD.ASM)
  3750                              <1> 	; Modified for TRDOS 386 DMA buffer allocation & initialization !
  3751                              <1> 
  3752 00010CCF 8B1D[8C6F0100]      <1> 	mov	ebx, [dma_start]
  3753 00010CD5 8B0D[906F0100]      <1> 	mov	ecx, [dma_count]
  3754                              <1> 
  3755 00010CDB 0FB635[826F0100]    <1> 	movzx	esi, byte [dma_channel]
  3756                              <1> 
  3757 00010CE2 6683FE04            <1> 	cmp	si, 4
  3758 00010CE6 7205                <1> 	jb	short gdmi1
  3759                              <1> 	; 08/08/2017
  3760 00010CE8 66D1E9              <1> 	shr	cx, 1 ; word count
  3761 00010CEB D1EB                <1> 	shr	ebx, 1 ; convert byte offset to word offset
  3762                              <1> gdmi1:
  3763                              <1> 	;mov	[dma_poff], bx ; 08/08/2017
  3764 00010CED 6649                <1> 	dec	cx			; dma size = block size - 1
  3765                              <1> 	
  3766 00010CEF 0FB696[BE160100]    <1> 	movzx	edx, byte [dma_mask+esi] ; 30/07/2017
  3767 00010CF6 A0[826F0100]        <1> 	mov	al, [dma_channel]
  3768 00010CFB 0C04                <1> 	or	al, 4
  3769 00010CFD EE                  <1> 	out	dx, al			; dma channel mask
  3770                              <1> 
  3771 00010CFE 30C0                <1> 	xor	al, al ; 0 ; any value ! 08/08/2017
  3772 00010D00 8A96[CE160100]      <1> 	mov	dl, [dma_flip+esi]
  3773 00010D06 EE                  <1> 	out	dx, al			; flip-flop clear
  3774                              <1> 	
  3775 00010D07 8A96[C6160100]      <1> 	mov	dl, [dma_mod+esi]
  3776 00010D0D A0[826F0100]        <1> 	mov	al, [dma_channel]  ; 13/07/2017
  3777 00010D12 2403                <1> 	and	al, 3
  3778                              <1> 	; 08/08/2017
  3779 00010D14 0A05[836F0100]      <1> 	or	al, [dma_mode] ; 58h    ; dma mode for SB16
  3780 00010D1A EE                  <1> 	out	dx, al			
  3781                              <1> 
  3782 00010D1B 8A96[A6160100]      <1> 	mov	dl, [dma_adr+esi]	
  3783 00010D21 88D8                <1> 	mov	al, bl			
  3784 00010D23 EE                  <1> 	out	dx, al			; offset low
  3785                              <1> 
  3786 00010D24 88F8                <1> 	mov	al, bh
  3787 00010D26 EE                  <1> 	out	dx, al			; offset high
  3788                              <1> 
  3789 00010D27 8A96[AE160100]      <1> 	mov	dl, [dma_cnt+esi]
  3790 00010D2D 88C8                <1> 	mov	al, cl
  3791 00010D2F EE                  <1> 	out	dx, al			; size low
  3792                              <1> 
  3793 00010D30 88E8                <1> 	mov	al, ch
  3794 00010D32 EE                  <1> 	out	dx, al			; size high
  3795                              <1> 
  3796 00010D33 8A96[B6160100]      <1> 	mov	dl, [dma_page+esi]
  3797                              <1> 	; 14/08/2017 
  3798 00010D39 6683FE04            <1> 	cmp	si, 4
  3799 00010D3D 7305                <1> 	jnb	short gdmi2
  3800 00010D3F C1EB10              <1> 	shr	ebx, 16
  3801 00010D42 EB06                <1> 	jmp	short gdmi3
  3802                              <1> gdmi2:
  3803                              <1> 	; 09/08/2017
  3804 00010D44 C1EB0F              <1> 	shr	ebx, 15	 ; complete 16 bit shift
  3805 00010D47 80E3FE              <1> 	and	bl, 0FEh ; clear bit 0 (not necessary)
  3806                              <1> gdmi3:	
  3807 00010D4A 88D8                <1> 	mov	al, bl
  3808 00010D4C EE                  <1> 	out	dx, al			; page			
  3809                              <1> 	
  3810 00010D4D 8A96[BE160100]      <1> 	mov	dl, [dma_mask+esi]
  3811 00010D53 A0[826F0100]        <1> 	mov	al, [dma_channel]  ; 13/07/2017
  3812 00010D58 2403                <1> 	and	al, 3
  3813 00010D5A EE                  <1> 	out	dx, al			; dma channel unmask
  3814                              <1> 
  3815                              <1> 	;retn
  3816                              <1> 	; 28/08/2017
  3817 00010D5B E902BAFFFF          <1> 	jmp	sysret
  3818                              <1> 
  3819                              <1> otty:
  3820                              <1> sret:
  3821                              <1> ocvt:
  3822                              <1> ctty:
  3823                              <1> cret:
  3824                              <1> ccvt:
  3825                              <1> rtty:
  3826                              <1> wtty:
  3827                              <1> rmem:
  3828                              <1> wmem:
  3829                              <1> rfd:
  3830                              <1> rhd:
  3831                              <1> wfd:
  3832                              <1> whd:
  3833                              <1> rlpt:
  3834                              <1> wlpt:
  3835                              <1> rcvt:
  3836                              <1> xmtt:
  3837 00010D60 C3                  <1> 	retn
  2313                                  %include 'trdosk9.s' ; 04/01/2016
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.2) - INITIALIZED DATA : trdosk9.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 01/09/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 04/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; ----------------------------------------------------------------------------
     9                              <1> ; Assembler: NASM version 2.14 (trdos386.s)
    10                              <1> ; ----------------------------------------------------------------------------
    11                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    12                              <1> ; TRDOS2.ASM (09/11/2011)
    13                              <1> ; ****************************************************************************
    14                              <1> ; DRV_INIT.ASM [26/09/2009] Last Update: 07/08/2011
    15                              <1> ; MAINPROG.ASM [17/01/2004] Last Update: 09/11/2011
    16                              <1> ; CMD_INTR.ASM [29/01/2005] Last Update: 09/11/2011
    17                              <1> ; FILE.ASM [29/10/2009] Last Update: 09/10/2011
    18                              <1> 
    19                              <1> ; 12/02/2016
    20                              <1> Last_DOS_DiskNo: 
    21 00010D61 01                  <1> 		db 1 ; A: = 0 & B: = 1
    22                              <1> 
    23                              <1> Restore_CDIR:	
    24 00010D62 FF                  <1> 		db 0FFh ; Initial value -> any number except 0
    25                              <1> 
    26                              <1> msg_CRLF_temp:  
    27 00010D63 070D0A00            <1> 		db 07h, 0Dh, 0Ah, 0
    28                              <1> 
    29                              <1> Magic_Bytes:
    30 00010D67 04                  <1> 		db 4
    31 00010D68 01                  <1> 		db 1
    32                              <1> mainprog_Version:
    33 00010D69 07                  <1> 		db 7
    34 00010D6A 5B5452444F535D204D- <1> 		db "[TRDOS] Main Program v2.0.010920"
    34 00010D73 61696E2050726F6772- <1>
    34 00010D7C 616D2076322E302E30- <1>
    34 00010D85 3130393230          <1>
    35 00010D8A 0D0A                <1> 		db 0Dh, 0Ah
    36 00010D8C 286329204572646F67- <1> 		db "(c) Erdogan Tan 2005-2020"
    36 00010D95 616E2054616E203230- <1>
    36 00010D9E 30352D32303230      <1>
    37 00010DA5 0D0A00              <1> 		db 0Dh, 0Ah, 0
    38                              <1> 
    39                              <1> MainProgCfgFile: ; 14/04/2016
    40 00010DA8 4D41494E50524F472E- <1> 		db "MAINPROG.CFG", 0
    40 00010DB1 43464700            <1>
    41                              <1> 
    42                              <1> TRDOSPromptLabel:
    43 00010DB5 5452444F53          <1> 		db "TRDOS"
    44 00010DBA 00                  <1> 		db 0
    45 00010DBB 00<rept>            <1>                 times 5 db 0
    46 00010DC0 00                  <1> 		db 0
    47                              <1> 
    48                              <1> ; INTERNAL COMMANDS
    49                              <1> Command_List:
    50 00010DC1 44495200            <1> Cmd_Dir:	db "DIR", 0
    51 00010DC5 434400              <1> Cmd_Cd:		db "CD", 0
    52 00010DC8 433A00              <1> Cmd_Drive:	db "C:", 0
    53 00010DCB 56455200            <1> Cmd_Ver:	db "VER", 0
    54 00010DCF 4558495400          <1> Cmd_Exit:	db "EXIT", 0
    55 00010DD4 50524F4D505400      <1> Cmd_Prompt:	db "PROMPT", 0
    56 00010DDB 564F4C554D4500      <1> Cmd_Volume:	db "VOLUME", 0
    57 00010DE2 4C4F4E474E414D4500  <1> Cmd_LongName:	db "LONGNAME", 0
    58 00010DEB 4441544500          <1> Cmd_Date:	db "DATE", 0
    59 00010DF0 54494D4500          <1> Cmd_Time:	db "TIME", 0
    60 00010DF5 52554E00            <1> Cmd_Run:	db "RUN", 0
    61 00010DF9 53455400            <1> Cmd_Set:	db "SET", 0 
    62 00010DFD 434C5300            <1> Cmd_Cls:	db "CLS", 0
    63 00010E01 53484F5700          <1> Cmd_Show:	db "SHOW", 0
    64 00010E06 44454C00            <1> Cmd_Del:	db "DEL", 0
    65 00010E0A 41545452494200      <1> Cmd_Attrib:	db "ATTRIB", 0
    66 00010E11 52454E414D4500      <1> Cmd_Rename:	db "RENAME", 0
    67 00010E18 524D44495200        <1> Cmd_Rmdir:	db "RMDIR", 0
    68 00010E1E 4D4B44495200        <1> Cmd_Mkdir:	db "MKDIR", 0
    69 00010E24 434F505900          <1> Cmd_Copy:	db "COPY", 0
    70 00010E29 4D4F564500          <1> Cmd_Move:	db "MOVE", 0
    71 00010E2E 5041544800          <1> Cmd_Path:	db "PATH", 0
    72 00010E33 4D454D00            <1> Cmd_Mem:	db "MEM", 0
    73 00010E37 00                  <1> 		db 0
    74 00010E38 46494E4400          <1> Cmd_Find:	db "FIND", 0
    75 00010E3D 4543484F00          <1> Cmd_Echo:	db "ECHO", 0
    76 00010E42 2A00                <1> Cmd_Remark:	db "*", 0
    77 00010E44 3F00                <1> Cmd_Help:	db "?", 0
    78 00010E46 44455649434500      <1> Cmd_Device:	db "DEVICE", 0
    79 00010E4D 4445564C49535400    <1> Cmd_DevList:	db "DEVLIST", 0
    80 00010E55 434844495200        <1> Cmd_Chdir:	db "CHDIR", 0
    81 00010E5B 4245455000          <1> Cmd_Beep:	db "BEEP", 0
    82                              <1> 		
    83 00010E60 00                  <1> 		db 0
    84                              <1> 
    85                              <1> ; 15/02/2016 (FILE.ASM, 09/10/2011)
    86                              <1> invalid_fname_chars:
    87 00010E61 222728292A2B2C2F    <1> 		db 22h, 27h, 28h, 29h, 2Ah, 2Bh, 2Ch, 2Fh
    88 00010E69 3A3B3C3D3E3F40      <1> 		db 3Ah, 3Bh, 3Ch, 3Dh, 3Eh, 3Fh, 40h
    89 00010E70 5B5C5D5E60          <1> 		db 5Bh, 5Ch, 5Dh, 5Eh, 60h
    90                              <1> sizeInvFnChars  equ ($ - invalid_fname_chars)                
    91                              <1> ;
    92                              <1> 
    93                              <1> Msg_Enter_Date:
    94 00010E75 456E746572206E6577- <1>                 db 'Enter new date (dd-mm-yy): '
    94 00010E7E 206461746520286464- <1>
    94 00010E87 2D6D6D2D7979293A20  <1>
    95 00010E90 00                  <1>                 db 0
    96                              <1> Msg_Show_Date:
    97 00010E91 43757272656E742064- <1>                 db   'Current date is '
    97 00010E9A 61746520697320      <1>
    98 00010EA1 30                  <1> Day:            db   '0'
    99 00010EA2 30                  <1> 		db   '0'
   100 00010EA3 2F                  <1>                 db   '/'
   101 00010EA4 30                  <1> Month:          db   '0'
   102 00010EA5 30                  <1> 		db   '0'
   103 00010EA6 2F                  <1>                 db   '/'
   104 00010EA7 30                  <1> Century:        db   '0'
   105 00010EA8 30                  <1>                 db   '0'
   106 00010EA9 30                  <1> Year:           db   '0'
   107 00010EAA 30                  <1> 		db   '0'
   108 00010EAB 0D0A00              <1>                 db   0Dh, 0Ah, 0
   109                              <1> 
   110                              <1> Msg_Enter_Time:
   111 00010EAE 456E746572206E6577- <1> 		db 'Enter new time: '
   111 00010EB7 2074696D653A20      <1>
   112 00010EBE 00                  <1> 		db 0
   113                              <1> Msg_Show_Time:
   114 00010EBF 43757272656E742074- <1> 		db   'Current time is '
   114 00010EC8 696D6520697320      <1>
   115 00010ECF 30                  <1> Hour:           db   '0'
   116 00010ED0 30                  <1> 		db   '0'
   117 00010ED1 3A                  <1> 		db   ':'
   118 00010ED2 30                  <1> Minute:         db   '0'
   119 00010ED3 30                  <1> 		db   '0'
   120 00010ED4 3A                  <1> 		db   ':'
   121 00010ED5 30                  <1> Second:         db   '0'
   122 00010ED6 30                  <1> 		db   '0'
   123 00010ED7 0D0A00              <1> 		db   0Dh, 0Ah, 0
   124                              <1> 
   125                              <1> ;VolSize_Unit1:   dd 0
   126                              <1> ;VolSize_Unit2:   dd 0
   127                              <1> 
   128                              <1> VolSize_KiloBytes:
   129 00010EDA 206B696C6F62797465- <1> 		db " kilobytes", 0Dh, 0Ah, 0
   129 00010EE3 730D0A00            <1>
   130                              <1> VolSize_Bytes:
   131 00010EE7 2062797465730D0A00  <1> 		db " bytes", 0Dh, 0Ah, 0
   132                              <1> Volume_in_drive:
   133 00010EF0 0D0A                <1> 		db 0Dh, 0Ah
   134                              <1> Vol_FS_Name:
   135 00010EF2 54522046533120      <1> 		db "TR FS1 "
   136 00010EF9 566F6C756D6520696E- <1> 		db "Volume in drive "
   136 00010F02 20647269766520      <1>
   137 00010F09 30                  <1> Vol_Drv_Name:   db 30h
   138 00010F0A 3A                  <1> 		db ":"
   139 00010F0B 20697320            <1> 		db " is "
   140 00010F0F 0D0A00              <1> 		db 0Dh, 0Ah, 0
   141                              <1> Dir_Drive_Str:
   142 00010F12 54522D444F53204472- <1>                 db "TR-DOS Drive "
   142 00010F1B 69766520            <1>
   143                              <1> Dir_Drive_Name:
   144 00010F1F 303A                <1>                 db "0:"
   145 00010F21 0D0A                <1>                 db  0Dh, 0Ah
   146                              <1> Vol_Str_Header:
   147 00010F23 566F6C756D65204E61- <1>                 db "Volume Name: "
   147 00010F2C 6D653A20            <1>
   148                              <1> Vol_Name:
   149 00010F30 00<rept>            <1> 		times 64 db 0
   150 00010F70 00                  <1> 		db 0
   151                              <1> Vol_Serial_Header:
   152 00010F71 0D0A                <1> 		db 0Dh, 0Ah
   153 00010F73 566F6C756D65205365- <1> 		db "Volume Serial No: "
   153 00010F7C 7269616C204E6F3A20  <1>
   154                              <1> Vol_Serial1:
   155 00010F85 30303030            <1> 		db "0000"
   156 00010F89 2D                  <1> 		db "-"
   157                              <1> Vol_Serial2:
   158 00010F8A 30303030            <1> 		db "0000"
   159 00010F8E 0D0A00              <1> 		db 0Dh, 0Ah, 0
   160                              <1> 
   161                              <1> ;Vol_Tot_Sec_Str_Start:
   162                              <1> ;		dd 0
   163                              <1> Vol_Total_Sector_Header:
   164 00010F91 0D0A                <1> 		db 0Dh, 0Ah
   165 00010F93 566F6C756D65205369- <1> 		db "Volume Size : ", 0
   165 00010F9C 7A65203A2000        <1>
   166                              <1> ;Vol_Tot_Sec_Str: 
   167                              <1> ;		db "0000000000"
   168                              <1> ;Vol_Tot_Sec_Str_End:
   169                              <1> ;		db 0
   170                              <1> ;Vol_Free_Sectors_Str_Start:
   171                              <1> ;		dd 0
   172                              <1> Vol_Free_Sectors_Header:
   173 00010FA2 467265652053706163- <1> 		db "Free Space  : ", 0
   173 00010FAB 6520203A2000        <1>
   174                              <1> ;Vol_Free_Sectors_Str:
   175                              <1> ;		db "0000000000"
   176                              <1> ;Vol_Free_Sectors_Str_End:
   177                              <1> ;		db 0
   178                              <1> 
   179                              <1> Dir_Str_Header:
   180 00010FB1 4469726563746F7279- <1>                 db "Directory: "
   180 00010FBA 3A20                <1>
   181 00010FBC 2F                  <1> Dir_Str_Root:   db "/"
   182 00010FBD 00<rept>            <1> Dir_Str:        times 64 db 0
   183 00010FFD 00000000            <1>                 dd 0
   184 00011001 00                  <1>                 db 0
   185                              <1> 
   186                              <1> Msg_Bad_Command:
   187 00011002 42616420636F6D6D61- <1>                 db "Bad command or file name!"
   187 0001100B 6E64206F722066696C- <1>
   187 00011014 65206E616D6521      <1>
   188 0001101B 0D0A00              <1>                 db 0Dh, 0Ah, 0
   189                              <1> 
   190                              <1> msgl_drv_not_ready: 
   191 0001101E 070D0A              <1> 		db 07h, 0Dh, 0Ah
   192                              <1> 
   193                              <1> ; CMD_INTR.ASM - 09/11/2011 - Messages
   194                              <1> 
   195                              <1> Msg_Not_Ready_Read_Err:
   196 00011021 4472697665206E6F74- <1>                 db "Drive not ready or read error!"
   196 0001102A 207265616479206F72- <1>
   196 00011033 207265616420657272- <1>
   196 0001103C 6F7221              <1>
   197 0001103F 0D0A00              <1>                 db 0Dh, 0Ah, 0
   198                              <1> 
   199                              <1> Msg_Not_Ready_Write_Err:
   200 00011042 4472697665206E6F74- <1>                 db "Drive not ready or write error!"
   200 0001104B 207265616479206F72- <1>
   200 00011054 207772697465206572- <1>
   200 0001105D 726F7221            <1>
   201 00011061 0D0A00              <1>                 db 0Dh, 0Ah, 0
   202                              <1> 
   203                              <1> Msg_Dir_Not_Found:
   204 00011064 4469726563746F7279- <1>                 db "Directory not found!"
   204 0001106D 206E6F7420666F756E- <1>
   204 00011076 6421                <1>
   205 00011078 0D0A00              <1>                 db 0Dh, 0Ah, 0
   206                              <1> 
   207                              <1> Msg_File_Not_Found:
   208 0001107B 46696C65206E6F7420- <1>                 db "File not found!"
   208 00011084 666F756E6421        <1>
   209 0001108A 0D0A00              <1>                 db 0Dh, 0Ah, 0
   210                              <1> 
   211                              <1> Msg_File_Directory_Not_Found:
   212 0001108D 46696C65206F722064- <1>                 db "File or directory not found!"
   212 00011096 69726563746F727920- <1>
   212 0001109F 6E6F7420666F756E64- <1>
   212 000110A8 21                  <1>
   213 000110A9 0D0A00              <1>                 db 0Dh, 0Ah, 0
   214                              <1> 
   215                              <1> Msg_LongName_Not_Found:
   216 000110AC 4C6F6E67206E616D65- <1>                 db "Long name not found!"
   216 000110B5 206E6F7420666F756E- <1>
   216 000110BE 6421                <1>
   217 000110C0 0D0A00              <1>                 db 0Dh, 0Ah, 0
   218                              <1> 
   219                              <1> beep_Insufficient_Memory: ; 20/02/2017
   220 000110C3 0D0A                <1> 		db 0Dh, 0Ah
   221 000110C5 07                  <1> 		db 07h
   222                              <1> Msg_Insufficient_Memory:
   223 000110C6 496E73756666696369- <1>                 db "Insufficient memory!"
   223 000110CF 656E74206D656D6F72- <1>
   223 000110D8 7921                <1>
   224 000110DA 0D0A00              <1>                 db 0Dh, 0Ah, 0
   225                              <1> 
   226                              <1> Msg_Error_Code:
   227 000110DD 436F6D6D616E642066- <1>                 db 'Command failed! Error code : '
   227 000110E6 61696C656421204572- <1>
   227 000110EF 726F7220636F646520- <1>
   227 000110F8 3A20                <1>
   228 000110FA 303068              <1> error_code_hex: db '00h'
   229 000110FD 0A0A00              <1>                 db 0Ah, 0Ah, 0
   230                              <1> 
   231                              <1> align 2
   232                              <1> 
   233                              <1> ; 10/02/2016
   234                              <1> ; DIR.ASM - 09/10/2011
   235                              <1> 
   236 00011100 3C4449523E20202020- <1> Type_Dir:       db '<DIR>     ' ; 10 bytes
   236 00011109 20                  <1>
   237                              <1> 
   238                              <1> File_Name:
   239 0001110A 20<rept>            <1>                 times 12 db 20h
   240 00011116 20                  <1> 		db 20h
   241                              <1> Dir_Or_FileSize:
   242 00011117 20<rept>            <1>                 times 10 db 20h
   243 00011121 20                  <1> 		db 20h
   244                              <1> File_Attribute:
   245 00011122 20202020            <1> 		dd 20202020h
   246 00011126 20                  <1> 		db 20h
   247                              <1> File_Day:
   248 00011127 3030                <1>                 db '0','0'
   249 00011129 2F                  <1> 		db '/'
   250                              <1> File_Month:
   251 0001112A 3030                <1>                 db '0','0'
   252 0001112C 2F                  <1> 		db '/'
   253                              <1> File_Year:
   254 0001112D 30303030            <1>                 db '0','0','0','0'
   255 00011131 20                  <1> 		db 20h
   256                              <1> File_Hour:
   257 00011132 3030                <1>                 db '0','0'
   258 00011134 3A                  <1> 		db ':'
   259                              <1> File_Minute:
   260 00011135 3030                <1>                 db '0','0'
   261 00011137 00                  <1> 		db 0
   262                              <1> 
   263                              <1> Decimal_File_Count_Header:
   264 00011138 0D0A                <1> 		db 0Dh, 0Ah
   265                              <1> Decimal_File_Count:
   266 0001113A 00<rept>            <1> 		times 6 db 0
   267                              <1> 
   268 00011140 2066696C6528732920- <1> str_files:	db " file(s) & "
   268 00011149 2620                <1>
   269                              <1> Decimal_Dir_Count: 
   270 0001114B 00<rept>            <1> 		times 6 db 0
   271                              <1> str_dirs:       
   272 00011151 206469726563746F72- <1> 		db " directory(s) "
   272 0001115A 7928732920          <1>
   273 0001115F 0D0A00              <1> 		db 0Dh, 0Ah, 0
   274                              <1> 
   275 00011162 206279746528732920- <1> str_bytes:	db " byte(s) in file(s)"
   275 0001116B 696E2066696C652873- <1>
   275 00011174 29                  <1>
   276 00011175 0D0A00              <1> 		db 0Dh, 0Ah, 0
   277                              <1> 
   278                              <1> ; CMD_INTR.ASM - 09/11/2011
   279                              <1> ; 07/10/2010
   280                              <1> Msg_invalid_name_chars:
   281 00011178 496E76616C69642066- <1>                 db "Invalid file or directory name characters!"
   281 00011181 696C65206F72206469- <1>
   281 0001118A 726563746F7279206E- <1>
   281 00011193 616D65206368617261- <1>
   281 0001119C 637465727321        <1>
   282 000111A2 0D0A00              <1>         	db 0Dh, 0Ah, 0
   283                              <1> ; 21/02/2016
   284 000111A5 46696C65206F722064- <1> Msg_Name_Exists: db "File or directory name exists!"
   284 000111AE 69726563746F727920- <1>
   284 000111B7 6E616D652065786973- <1>
   284 000111C0 747321              <1>
   285 000111C3 0D0A00              <1>                 db 0Dh, 0Ah, 0
   286                              <1> Msg_DoYouWantMkdir:
   287 000111C6 446F20796F75207761- <1>                 db "Do you want to make directory ", 0
   287 000111CF 6E7420746F206D616B- <1>
   287 000111D8 65206469726563746F- <1>
   287 000111E1 72792000            <1>
   288 000111E5 2028592F4E29203F20- <1> Msg_YesNo:      db " (Y/N) ? ", 0  
   288 000111EE 00                  <1>
   289 000111EF 000D0A00            <1> Y_N_nextline:	db 0, 0Dh, 0Ah, 0 
   290 000111F3 4F4B2E0D0A00        <1> Msg_OK:		db "OK.", 0Dh, 0Ah, 0
   291                              <1> 
   292                              <1> ; 27/02/2016
   293                              <1> Msg_DoYouWantRmDir:
   294 000111F9 446F20796F75207761- <1>                 db "Do you want to delete directory ", 0
   294 00011202 6E7420746F2064656C- <1>
   294 0001120B 657465206469726563- <1>
   294 00011214 746F72792000        <1>
   295                              <1> Msg_Dir_Not_Empty:
   296 0001121A 4469726563746F7279- <1>                 db "Directory not empty!"
   296 00011223 206E6F7420656D7074- <1>
   296 0001122C 7921                <1>
   297 0001122E 0D0A00              <1>                 db 0Dh, 0Ah, 0
   298                              <1> 
   299                              <1> Msg_DoYouWantDelete:
   300 00011231 446F20796F75207761- <1>                 db "Do you want to delete file ",0
   300 0001123A 6E7420746F2064656C- <1>
   300 00011243 6574652066696C6520- <1>
   300 0001124C 00                  <1>
   301                              <1> 
   302 0001124D 44656C657465642E2E- <1> Msg_Deleted:    db "Deleted...", 0Dh, 0Ah, 0
   302 00011256 2E0D0A00            <1>
   303                              <1> 
   304                              <1> Msg_Permission_Denied:
   305 0001125A 07                  <1>                 db 7
   306 0001125B 5065726D697373696F- <1>                 db "Permission denied!", 0Dh, 0Ah, 0
   306 00011264 6E2064656E69656421- <1>
   306 0001126D 0D0A00              <1>
   307                              <1> 
   308                              <1> ; 04/03/2016
   309 00011270 4E657720            <1> Msg_New:        db "New "
   310 00011274 00                  <1>                 db 0
   311                              <1> Str_Attributes:
   312 00011275 417474726962757465- <1>                 db "Attributes : "
   312 0001127E 73203A20            <1>
   313 00011282 4E4F524D414C        <1> Attr_Chars:     db "NORMAL"
   314 00011288 00                  <1>                 db 0
   315                              <1> 
   316                              <1> ; 06/03/2016
   317                              <1> ; CMD_INTR.ASM - 16/11/2010 
   318                              <1> Msg_DoYouWantRename:
   319 00011289 446F20796F75207761- <1>                 db "Do you want to rename ", 0
   319 00011292 6E7420746F2072656E- <1>
   319 0001129B 616D652000          <1>
   320 000112A0 66696C652000        <1> Rename_File:    db "file ", 0
   321 000112A6 6469726563746F7279- <1> Rename_Directory: db "directory ", 0
   321 000112AF 2000                <1>
   322 000112B1 00<rept>            <1> Rename_OldName: times 13 db 0
   323 000112BE 20617320            <1> Msg_File_rename_as: db " as "
   324 000112C2 00<rept>            <1> Rename_NewName: times 13 db 0
   325                              <1> 
   326                              <1> ; 08/03/2016
   327                              <1> ; CMD_INTR.ASM - 01/08/2010 - 23/04/2011
   328                              <1> msg_not_same_drv:
   329 000112CF 4E6F742073616D6520- <1>                 db "Not same drive!" 
   329 000112D8 647269766521        <1>
   330 000112DE 0D0A00              <1>                 db 0Dh, 0Ah, 0 
   331                              <1> 
   332                              <1> Msg_DoYouWantMoveFile:
   333 000112E1 446F20796F75207761- <1>                 db "Do you want to move file", 0
   333 000112EA 6E7420746F206D6F76- <1>
   333 000112F3 652066696C6500      <1>
   334                              <1> 
   335                              <1> msg_insufficient_disk_space:
   336 000112FA 496E73756666696369- <1>                 db "Insufficient disk space!" 
   336 00011303 656E74206469736B20- <1>
   336 0001130C 737061636521        <1>
   337 00011312 0D0A00              <1>                 db 0Dh, 0Ah, 0
   338                              <1> 
   339                              <1> ; 01/08/2010
   340                              <1> msg_source_file: 
   341 00011315 0D0A536F7572636520- <1> 		db 0Dh, 0Ah, "Source file name      :   "
   341 0001131E 66696C65206E616D65- <1>
   341 00011327 2020202020203A2020- <1>
   341 00011330 20                  <1>
   342                              <1> msg_source_file_drv: 
   343 00011331 203A00              <1> 		db " :", 0
   344                              <1> msg_destination_file: 
   345 00011334 0D0A44657374696E61- <1> 		db 0Dh, 0Ah, "Destination file name :   "
   345 0001133D 74696F6E2066696C65- <1>
   345 00011346 206E616D65203A2020- <1>
   345 0001134F 20                  <1>
   346                              <1> msg_destination_file_drv: 
   347 00011350 203A00              <1> 		db " :", 0
   348                              <1> msg_copy_nextline: 
   349 00011353 0D0A00              <1> 		db 0Dh, 0Ah, 0
   350                              <1> 
   351                              <1> ; 15/03/2016
   352                              <1> ; CMD_INTR.ASM
   353                              <1> 
   354                              <1> Msg_DoYouWantOverWriteFile:
   355 00011356 446F20796F75207761- <1>                 db "Do you want to overwrite file ",0
   355 0001135F 6E7420746F206F7665- <1>
   355 00011368 727772697465206669- <1>
   355 00011371 6C652000            <1>
   356                              <1>   
   357                              <1> Msg_DoYouWantCopyFile:
   358 00011375 446F20796F75207761- <1>                 db "Do you want to copy file",0
   358 0001137E 6E7420746F20636F70- <1>
   358 00011387 792066696C6500      <1>
   359                              <1> 
   360                              <1> Msg_read_file_error_before_EOF:
   361 0001138E 46696C652072656164- <1> 		db "File reading error! (before EOF)"
   361 00011397 696E67206572726F72- <1>
   361 000113A0 2120286265666F7265- <1>
   361 000113A9 20454F4629          <1>
   362 000113AE 0A0A00              <1> 		db 0Ah, 0Ah, 0
   363                              <1> 
   364                              <1> ; 18/03/2016
   365                              <1> ; TRDOS 386 (v2.0) mainprog copy procedure
   366                              <1> msg_reading:
   367 000113B1 52656164696E672E2E- <1> 		db "Reading... ", 0
   367 000113BA 2E2000              <1>
   368                              <1> msg_writing:
   369 000113BD 57726974696E672E2E- <1> 		db "Writing... ", 0
   369 000113C6 2E2000              <1>
   370                              <1> percentagestr:
   371 000113C9 2020202500          <1> 		db "   %", 0  ; "  0%" .. "100%"
   372                              <1> ; 11/04/2016
   373                              <1> Msg_No_Set_Space:
   374 000113CE 496E73756666696369- <1>                 db "Insufficient environment space!"
   374 000113D7 656E7420656E766972- <1>
   374 000113E0 6F6E6D656E74207370- <1>
   374 000113E9 61636521            <1>
   375 000113ED 0D0A00              <1>                 db 0Dh, 0Ah, 0
   376                              <1> ; 18/04/2016
   377                              <1> isc_msg:	
   378 000113F0 0D0A                <1> 		db 0Dh, 0Ah
   379 000113F2 494E56414C49442053- <1> 		db "INVALID SYSTEM CALL", 0
   379 000113FB 595354454D2043414C- <1>
   379 00011404 4C00                <1>
   380                              <1> usi_msg:
   381 00011406 0D0A                <1> 		db 0Dh, 0Ah
   382 00011408 554E444546494E4544- <1> 		db "UNDEFINED SOFTWARE INTERRUPT", 0
   382 00011411 20534F465457415245- <1>
   382 0001141A 20494E544552525550- <1>
   382 00011423 5400                <1>
   383                              <1> ifc_msg:
   384 00011425 0D0A                <1> 		db 0Dh, 0Ah
   385 00011427 494E56414C49442046- <1> 		db "INVALID FUNCTION CALL"
   385 00011430 554E4354494F4E2043- <1>
   385 00011439 414C4C              <1>
   386                              <1> inv_msg_for_trdos_v2:
   387 0001143C 20                  <1> 		db 20h
   388 0001143D 666F72205452444F53- <1> 		db "for TRDOS v2!"
   388 00011446 20763221            <1>
   389 0001144A 07                  <1> 		db 07h
   390 0001144B 0D0A                <1> 		db 0Dh, 0Ah
   391 0001144D 0D0A                <1> 		db 0Dh, 0Ah
   392 0001144F 494E5420            <1> 		db "INT "
   393 00011453 303068              <1> int_num_str:	db "00h"
   394 00011456 0D0A                <1> 		db 0Dh, 0Ah
   395 00011458 454158203A20        <1> 		db "EAX : "
   396 0001145E 303030303030303068- <1> eax_str:	db "00000000h", 0Dh, 0Ah
   396 00011467 0D0A                <1>
   397 00011469 454950203A20        <1> 		db "EIP : "
   398 0001146F 303030303030303068- <1> eip_str:	db "00000000h", 0Dh, 0Ah, 0
   398 00011478 0D0A00              <1>
   399                              <1> 
   400                              <1> ; 07/10/2016
   401                              <1> ; Device names & parameters (for kernel devices)
   402                              <1> 
   403 0001147B 90                  <1> align 2
   404                              <1> KDEV_NAME:
   405 0001147C 5454590000000000    <1> 		db 'TTY',0,0,0,0,0 ; 1
   406 00011484 4D454D0000000000    <1> 		db 'MEM',0,0,0,0,0 ; 2
   407 0001148C 4644300000000000    <1> 		db 'FD0',0,0,0,0,0 ; 3
   408 00011494 4644310000000000    <1> 		db 'FD1',0,0,0,0,0 ; 4
   409 0001149C 4844300000000000    <1> 		db 'HD0',0,0,0,0,0 ; 5
   410 000114A4 4844310000000000    <1> 		db 'HD1',0,0,0,0,0 ; 6
   411 000114AC 4844320000000000    <1> 		db 'HD2',0,0,0,0,0 ; 7
   412 000114B4 4844330000000000    <1> 		db 'HD3',0,0,0,0,0 ; 8
   413 000114BC 4C50540000000000    <1> 		db 'LPT',0,0,0,0,0 ; 9
   414 000114C4 5454593000000000    <1> 		db 'TTY0',0,0,0,0 ; 10
   415 000114CC 5454593100000000    <1> 		db 'TTY1',0,0,0,0 ; 11
   416 000114D4 5454593200000000    <1> 		db 'TTY2',0,0,0,0 ; 12
   417 000114DC 5454593300000000    <1> 		db 'TTY3',0,0,0,0 ; 13
   418 000114E4 5454593400000000    <1> 		db 'TTY4',0,0,0,0 ; 14
   419 000114EC 5454593500000000    <1> 		db 'TTY5',0,0,0,0 ; 15
   420 000114F4 5454593600000000    <1> 		db 'TTY6',0,0,0,0 ; 16
   421 000114FC 5454593700000000    <1> 		db 'TTY7',0,0,0,0 ; 17
   422 00011504 5454593800000000    <1> 		db 'TTY8',0,0,0,0 ; 18
   423 0001150C 5454593900000000    <1> 		db 'TTY9',0,0,0,0 ; 19
   424 00011514 434F4D3100000000    <1> 		db 'COM1',0,0,0,0 ; 18
   425 0001151C 434F4D3200000000    <1> 		db 'COM2',0,0,0,0 ; 19
   426                              <1> 		;db 'CONSOLE',0	  ; 1
   427                              <1> 		;db 'PRINTER',0   ; 9
   428                              <1> 		;db 'CDROM'	  ; 20
   429                              <1> 		;db 'CDROM0'	  ; 20
   430                              <1> 		;db 'CDROM1'	  ; 21		
   431                              <1> 		;db 'DVD'	  ; 22
   432                              <1> 		;db 'DVD0'	  ; 22
   433                              <1> 		;db 'DVD1'	  ; 23		
   434                              <1> 		;db 'USB'	  ; 24
   435                              <1> 		;db 'USB0'	  ; 24
   436                              <1> 		;db 'USB1'	  ; 25
   437                              <1> 		;db 'USB2'	  ; 26
   438                              <1> 		;db 'USB3'        ; 27
   439                              <1> 		;db 'KEYBOARD'	  ; 1	
   440                              <1> 		;db 'MOUSE'	  ; 28
   441                              <1> 		;db 'SOUND'	  ; 29
   442                              <1> 		;db 'VGA',0,0,0,0 ; 30
   443                              <1> 		;db 'CGA',0,0,0,0 ; 31
   444                              <1> 		;db 'AUDIO',0,0,0 ; 29
   445                              <1> 		;db 'VIDEO',0,0,0 ; 32
   446                              <1> 		;db 'MUSIC',0,0,0 ; 33
   447                              <1> 		;db 'ETHERNET'	  ; 34 		
   448                              <1> 		;db 'SD0',0,0,0,0,0 ; 35
   449                              <1> 		;db 'SD1',0,0,0,0,0 ; 36
   450                              <1> 		;db 'SD2',0,0,0,0,0 ; 37
   451                              <1> 		;db 'SD3',0,0,0,0,0 ; 38
   452                              <1> 		;db 'SATA0'	  ; 35
   453                              <1> 		;db 'SATA1'	  ; 36
   454                              <1> 		;db 'SATA2'        ; 37
   455                              <1> 		;db 'SATA3'        ; 38
   456                              <1> 		;db 'PATA0',0,0,0  ; 5
   457                              <1> 		;db 'PATA1',0,0,0  ; 6
   458                              <1> 		;db 'PATA2',0,0,0  ; 7
   459                              <1> 		;db 'PATA3',0,0,0  ; 8
   460                              <1> 		;db 'WIRELESS'	  ; 39
   461                              <1> 		;db 'HDMI',0,0,0,0 ; 40
   462 00011524 4E554C4C00000000    <1> 		db 'NULL',0,0,0,0 ; 0
   463                              <1> 
   464                              <1> NumOfKernelDevNames equ ($-KDEV_NAME) / 8 ; 20 (07/10/2016)
   465                              <1> 
   466                              <1> KDEV_NUMBER:
   467 0001152C 010203040506070809  <1> 		db 1,2,3,4,5,6,7,8,9
   468 00011535 0A0B0C0D0E0F101112- <1> 		db 10,11,12,13,14,15,16,17,18,19
   468 0001153E 13                  <1>
   469 0001153F 121300              <1> 		db 18,19,0
   470                              <1> 
   471                              <1> NumOfKernelDevices equ $ - KDEV_NUMBER
   472                              <1> 
   473                              <1> KDEV_OADDR:
   474 00011542 [600D0100]          <1> 		dd otty ;tty  ; 1
   475 00011546 [600D0100]          <1> 		dd sret ;mem  ; 2
   476 0001154A [600D0100]          <1>  		dd sret ;fd0  ; 3
   477 0001154E [600D0100]          <1>  		dd sret ;fd1  ; 4
   478 00011552 [600D0100]          <1>  		dd sret ;hd0  ; 5
   479 00011556 [600D0100]          <1>  		dd sret ;hd1  ; 6
   480 0001155A [600D0100]          <1>  		dd sret ;hd2  ; 7
   481 0001155E [600D0100]          <1>  		dd sret ;hd3  ; 8
   482 00011562 [600D0100]          <1>  		dd sret ;lpt  ; 9
   483 00011566 [600D0100]          <1>  		dd ocvt ;tty0 ; 10
   484 0001156A [600D0100]          <1> 		dd ocvt ;tty1 ; 11
   485 0001156E [600D0100]          <1>  		dd ocvt ;tty2 ; 12
   486 00011572 [600D0100]          <1>  		dd ocvt ;tty3 ; 13
   487 00011576 [600D0100]          <1>  		dd ocvt ;tty4 ; 14
   488 0001157A [600D0100]          <1>  		dd ocvt ;tty5 ; 15
   489 0001157E [600D0100]          <1>  		dd ocvt ;tty6 ; 16
   490 00011582 [600D0100]          <1>  		dd ocvt ;tty7 ; 17
   491 00011586 [600D0100]          <1>  		dd ocvt ;tty8 ; 18
   492 0001158A [600D0100]          <1>  		dd ocvt ;tty9 ; 19
   493                              <1>  		;dd ocvt ;com1 ; 18
   494                              <1>  		;dd ocvt ;com2 ; 19
   495 0001158E [600D0100]          <1> 		dd sret ;null ; 20  
   496                              <1> KDEV_CADDR:
   497 00011592 [600D0100]          <1> 		dd ctty ;tty  ; 1
   498 00011596 [600D0100]          <1> 		dd cret ;mem  ; 2
   499 0001159A [600D0100]          <1>  		dd cret ;fd0  ; 3
   500 0001159E [600D0100]          <1>  		dd cret ;fd1  ; 4
   501 000115A2 [600D0100]          <1>  		dd cret ;hd0  ; 5
   502 000115A6 [600D0100]          <1>  		dd cret ;hd1  ; 6
   503 000115AA [600D0100]          <1>  		dd cret ;hd2  ; 7
   504 000115AE [600D0100]          <1>  		dd cret ;hd3  ; 8
   505 000115B2 [600D0100]          <1>  		dd cret ;lpt  ; 9
   506 000115B6 [600D0100]          <1>  		dd ocvt ;tty0 ; 10
   507 000115BA [600D0100]          <1> 		dd ccvt ;tty1 ; 11
   508 000115BE [600D0100]          <1>  		dd ccvt ;tty2 ; 12
   509 000115C2 [600D0100]          <1>  		dd ccvt ;tty3 ; 13
   510 000115C6 [600D0100]          <1>  		dd ccvt ;tty4 ; 14
   511 000115CA [600D0100]          <1>  		dd ccvt ;tty5 ; 15
   512 000115CE [600D0100]          <1>  		dd ccvt ;tty6 ; 16
   513 000115D2 [600D0100]          <1>  		dd ccvt ;tty7 ; 17
   514 000115D6 [600D0100]          <1>  		dd ccvt ;tty8 ; 18
   515 000115DA [600D0100]          <1>  		dd ccvt ;tty9 ; 19
   516                              <1>  		;dd ccvt ;com1 ; 18
   517                              <1>  		;dd ccvt ;com2 ; 19
   518 000115DE [600D0100]          <1> 		dd cret ;null ; 20
   519                              <1> 
   520                              <1> KDEV_RADDR:
   521 000115E2 [600D0100]          <1> 		dd rtty ;tty  ; 1
   522 000115E6 [600D0100]          <1> 		dd rmem ;mem  ; 2
   523 000115EA [600D0100]          <1>  		dd rfd  ;fd0  ; 3
   524 000115EE [600D0100]          <1>  		dd rfd  ;fd1  ; 4
   525 000115F2 [600D0100]          <1>  		dd rhd  ;hd0  ; 5
   526 000115F6 [600D0100]          <1>  		dd rhd  ;hd1  ; 6
   527 000115FA [600D0100]          <1>  		dd rhd  ;hd2  ; 7
   528 000115FE [600D0100]          <1>  		dd rhd  ;hd3  ; 8
   529 00011602 [600D0100]          <1>  		dd rlpt ;lpt  ; 9
   530 00011606 [600D0100]          <1>  		dd rcvt ;tty0 ; 10
   531 0001160A [600D0100]          <1> 		dd rcvt ;tty1 ; 11
   532 0001160E [600D0100]          <1>  		dd rcvt ;tty2 ; 12
   533 00011612 [600D0100]          <1>  		dd rcvt ;tty3 ; 13
   534 00011616 [600D0100]          <1>  		dd rcvt ;tty4 ; 14
   535 0001161A [600D0100]          <1>  		dd rcvt ;tty5 ; 15
   536 0001161E [600D0100]          <1>  		dd rcvt ;tty6 ; 16
   537 00011622 [600D0100]          <1>  		dd rcvt ;tty7 ; 17
   538 00011626 [600D0100]          <1>  		dd rcvt ;tty8 ; 18
   539 0001162A [600D0100]          <1>  		dd rcvt ;tty9 ; 19
   540                              <1>  		;dd rcvt ;com1 ; 18
   541                              <1>  		;dd rcvt ;com2 ; 19
   542 0001162E [44010100]          <1> 		dd rnull ;null ; 20  
   543                              <1> KDEV_WADDR:
   544 00011632 [600D0100]          <1> 		dd wtty ;tty  ; 1
   545 00011636 [600D0100]          <1> 		dd wmem ;mem  ; 2
   546 0001163A [600D0100]          <1>  		dd wfd  ;fd0  ; 3
   547 0001163E [600D0100]          <1>  		dd wfd  ;fd1  ; 4
   548 00011642 [600D0100]          <1>  		dd whd  ;hd0  ; 5
   549 00011646 [600D0100]          <1>  		dd whd  ;hd1  ; 6
   550 0001164A [600D0100]          <1>  		dd whd  ;hd2  ; 7
   551 0001164E [600D0100]          <1>  		dd whd  ;hd3  ; 8
   552 00011652 [600D0100]          <1>  		dd wlpt ;lpt  ; 9
   553 00011656 [600D0100]          <1>  		dd xmtt ;tty0 ; 10
   554 0001165A [600D0100]          <1> 		dd xmtt ;tty1 ; 11
   555 0001165E [600D0100]          <1>  		dd xmtt ;tty2 ; 12
   556 00011662 [600D0100]          <1>  		dd xmtt ;tty3 ; 13
   557 00011666 [600D0100]          <1>  		dd xmtt ;tty4 ; 14
   558 0001166A [600D0100]          <1>  		dd xmtt ;tty5 ; 15
   559 0001166E [600D0100]          <1>  		dd xmtt ;tty6 ; 16
   560 00011672 [600D0100]          <1>  		dd xmtt ;tty7 ; 17
   561 00011676 [600D0100]          <1>  		dd xmtt ;tty8 ; 18
   562 0001167A [600D0100]          <1>  		dd xmtt ;tty9 ; 19
   563                              <1>  		;dd xmtt ;com1 ; 18
   564                              <1>  		;dd xmtt ;com2 ; 19
   565 0001167E [45010100]          <1> 		dd wnull ;null ; 20  
   566                              <1> 
   567                              <1> ; DEV_ACCESS bits:
   568                              <1> 	; bit 0 = accessable by normal users
   569                              <1> 	; bit 1 = read access permission
   570                              <1> 	; bit 2 = write access permission
   571                              <1> 	; bit 3 = IOCTL permission to users
   572                              <1> 	; bit 4 = block device if it is set
   573                              <1> 	; bit 5 = 16 bit or 1024 byte data
   574                              <1> 	; bit 6 = 32 bit or 2048 byte data
   575                              <1> 	; bit 7 = installable device driver	
   576                              <1> 
   577                              <1> KDEV_ACCESS: ; 08/10/2016
   578 00011682 07                  <1> 		db  00000111b	; tty, 1
   579 00011683 07                  <1> 		db  00000111b	; mem, 2	
   580 00011684 8F                  <1> 		db  10001111b	; fd0, 3	
   581 00011685 8F                  <1> 		db  10001111b	; fd1, 4
   582 00011686 8F                  <1> 		db  10001111b	; hd0, 5
   583 00011687 8F                  <1> 		db  10001111b	; hd1, 6
   584 00011688 8F                  <1> 		db  10001111b	; hd2, 7
   585 00011689 8F                  <1> 		db  10001111b	; hd3, 8
   586 0001168A 07                  <1> 		db  00000111b   ; lpt, 9
   587 0001168B 07                  <1> 		db  00000111b	; tty0, 10
   588 0001168C 07                  <1> 		db  00000111b	; tty1, 11
   589 0001168D 07                  <1> 		db  00000111b	; tty2, 12
   590 0001168E 07                  <1> 		db  00000111b	; tty3, 13
   591 0001168F 07                  <1> 		db  00000111b	; tty4, 14
   592 00011690 07                  <1> 		db  00000111b	; tty5, 15
   593 00011691 07                  <1> 		db  00000111b	; tty6, 16
   594 00011692 07                  <1> 		db  00000111b	; tty7, 17
   595 00011693 07                  <1> 		db  00000111b	; tty8, 18
   596 00011694 07                  <1> 		db  00000111b	; tty9, 19
   597                              <1> 		;db 00000111b	; com1, 18
   598                              <1> 		;db 00000111b	; com2, 19
   599 00011695 00                  <1> 		db  00000000b   ; null, 0
   600                              <1> 
   601                              <1> ; 07/10/2016
   602                              <1> NumOfInstallableDevices equ 8
   603                              <1> NUMIDEV		equ NumOfInstallableDevices ; 8
   604                              <1> NUMOFDEVICES	equ NumOfKernelDevices + NumOfInstallableDevices
   605                              <1> 
   606                              <1> ; 26/02/2017
   607                              <1> ; IRQ Callback (& Signal Response Byte) service availibity
   608                              <1> ; 'syscalbac'
   609                              <1> ; ***************************************************
   610                              <1> ; IRQ 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
   611                              <1> ; --- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
   612                              <1> ; --- 00 00 00 01 02 03 00 04 00 05 06 07 08 09 00 00
   613                              <1> ; ***************************************************
   614                              <1> IRQenum:
   615 00011696 000000010203000400- <1> 	db  0,0,0,1,2,3,0,4,0,5,6,7,8,9,0,0
   615 0001169F 05060708090000      <1>
   616                              <1> 
   617                              <1> ; 28/08/2017
   618                              <1> ; 20/08/2017
   619                              <1> ; DMA Registers (for 'sysdma')
   620                              <1> ; 02/07/2017 (sb16mod.s)
   621 000116A6 00020406C0C4C8CC    <1> dma_adr:	db 0,2,4,6,0C0h,0C4h,0C8h,0CCh
   622 000116AE 01030507C2C6CACE    <1> dma_cnt:	db 1,3,5,7,0C2h,0C6h,0CAh,0CEh
   623 000116B6 878381828F8B898A    <1> dma_page:	db 87h,83h,81h,82h,8Fh,8Bh,89h,8Ah ; 03/08/2017
   624 000116BE 0A0A0A0AD4D4D4D4    <1> dma_mask:	db 0Ah,0Ah,0Ah,0Ah,0D4h,0D4h,0D4h,0D4h
   625 000116C6 0B0B0B0BD6D6D6D6    <1> dma_mod:	db 0Bh,0Bh,0Bh,0Bh,0D6h,0D6h,0D6h,0D6h
   626 000116CE 0C0C0C0CD8D8D8D8    <1> dma_flip:	db 0Ch,0Ch,0Ch,0Ch,0D8h,0D8h,0D8h,0D8h	
  2314                                  
  2315                                  ; 27/08/2014
  2316                                  scr_row:
  2317 000116D6 E0810B00                	dd 0B8000h + 0A0h + 0A0h + 0A0h ; Row 3
  2318                                  scr_col:
  2319 000116DA 00000000                	dd 0
  2320                                  
  2321 000116DE 90<rept>                Align 4
  2322                                  	; 15/04/2016
  2323                                  	; TRDOS 386 (TRDOS v2.0)
  2324                                  
  2325                                  	; 21/08/2014
  2326                                  ilist:
  2327                                  	;times 	32 dd cpu_except ; INT 0 to INT 1Fh
  2328                                  	;
  2329                                  	; Exception list
  2330                                  	; 25/08/2014	
  2331 000116E0 [20090000]              	dd	exc0	; 0h,  Divide-by-zero Error
  2332 000116E4 [27090000]              	dd	exc1	
  2333 000116E8 [2E090000]              	dd 	exc2	
  2334 000116EC [35090000]              	dd	exc3	
  2335 000116F0 [39090000]              	dd	exc4	
  2336 000116F4 [3D090000]              	dd	exc5	
  2337 000116F8 [41090000]              	dd 	exc6	; 06h,  Invalid Opcode
  2338 000116FC [45090000]              	dd	exc7	
  2339 00011700 [49090000]              	dd	exc8	
  2340 00011704 [4D090000]              	dd	exc9	
  2341 00011708 [51090000]              	dd 	exc10	
  2342 0001170C [55090000]              	dd	exc11
  2343 00011710 [59090000]              	dd	exc12
  2344 00011714 [5D090000]              	dd	exc13	; 0Dh, General Protection Fault
  2345 00011718 [61090000]              	dd 	exc14	; 0Eh, Page Fault
  2346 0001171C [65090000]              	dd	exc15
  2347 00011720 [69090000]              	dd	exc16
  2348 00011724 [6D090000]              	dd	exc17
  2349 00011728 [71090000]              	dd 	exc18
  2350 0001172C [75090000]              	dd	exc19
  2351 00011730 [79090000]              	dd 	exc20
  2352 00011734 [7D090000]              	dd	exc21
  2353 00011738 [81090000]              	dd	exc22
  2354 0001173C [85090000]              	dd	exc23
  2355 00011740 [89090000]              	dd 	exc24
  2356 00011744 [8D090000]              	dd	exc25
  2357 00011748 [91090000]              	dd	exc26
  2358 0001174C [95090000]              	dd	exc27
  2359 00011750 [99090000]              	dd 	exc28
  2360 00011754 [9D090000]              	dd	exc29
  2361 00011758 [A1090000]              	dd 	exc30
  2362 0001175C [A5090000]              	dd	exc31
  2363                                  IRQ_list: ; 28/02/2017 ('syscalbac')
  2364                                  	; Interrupt list
  2365 00011760 [94060000]              	dd	timer_int	; INT 20h
  2366                                  		;dd	irq0	
  2367 00011764 [080E0000]              	dd	kb_int		; 24/01/2016
  2368                                  		;dd	irq1
  2369 00011768 [76080000]              	dd	irq2
  2370                                  		; COM2 int
  2371 0001176C [7A080000]              	dd	irq3
  2372                                  		; COM1 int
  2373 00011770 [85080000]              	dd	irq4
  2374 00011774 [90080000]              	dd	irq5
  2375                                  ;DISKETTE_INT: ;06/02/2015
  2376 00011778 [D7410000]              	dd	fdc_int		; 16/02/2015, IRQ 6 handler	
  2377                                  		;dd	irq6
  2378                                  ; Default IRQ 7 handler against spurious IRQs (from master PIC)
  2379                                  ; 25/02/2015 (source: http://wiki.osdev.org/8259_PIC)
  2380 0001177C [FF0B0000]              	dd	default_irq7	; 25/02/2015
  2381                                  		;dd	irq7
  2382                                  ; Real Time Clock Interrupt
  2383 00011780 [FF070000]              	dd	rtc_int		; 23/02/2015, IRQ 8 handler
  2384                                  		;dd	irq8	; INT 28h
  2385 00011784 [A0080000]              	dd	irq9
  2386 00011788 [A4080000]              	dd	irq10
  2387 0001178C [A8080000]              	dd	irq11
  2388 00011790 [AC080000]              	dd	irq12
  2389 00011794 [B0080000]              	dd	irq13
  2390                                  ;HDISK_INT1:  ;06/02/2015 	
  2391 00011798 [8A4B0000]              	dd	hdc1_int 	; 21/02/2015, IRQ 14 handler		
  2392                                  		;dd	irq14
  2393                                  ;HDISK_INT2:  ;06/02/2015
  2394 0001179C [B14B0000]              	dd	hdc2_int 	; 21/02/2015, IRQ 15 handler		
  2395                                  		;dd	irq15	; INT 2Fh
  2396                                  		; 14/08/2015
  2397                                  	;dd	sysent		; INT 30h (system calls)
  2398                                  
  2399                                  	; 15/04/2016
  2400                                  	; TRDOS 386(TRDOS v2.0) Software Interrupts
  2401                                  
  2402 000117A0 [FD170100]              	dd	int30h		; Reserved for
  2403                                  				; !!! Retro UNIX (RUNIX) !!!
  2404                                  				; !!! SINGLIX !!! System Calls
  2405 000117A4 [FB140000]              	dd	int31h		; Video BIOS (IBM PC/AT, Int 10h)
  2406 000117A8 [270C0000]              	dd	int32h		; Keyboard Functions (IBM PC/AT, Int 16h)
  2407 000117AC [8E420000]              	dd	int33h		; DISK I/O (IBM PC/AT, Int 13h)
  2408 000117B0 [F7F90000]              	dd	int34h		; #IOCTL# (I/O port access support for ring 3)
  2409 000117B4 [DF590000]              	dd	int35h		; Time/Date Functions (IBM PC/AT, Int 1Ah)
  2410 000117B8 [B30A0000]              	dd	ignore_int	; INT 36h : Timer Functions	
  2411 000117BC [B30A0000]              	dd	ignore_int	; INT 37h	
  2412 000117C0 [B30A0000]              	dd	ignore_int	; INT 38h
  2413 000117C4 [B30A0000]              	dd	ignore_int	; INT 39h
  2414 000117C8 [B30A0000]              	dd	ignore_int	; INT 3Ah	
  2415 000117CC [B30A0000]              	dd	ignore_int	; INT 3Bh
  2416 000117D0 [B30A0000]              	dd	ignore_int	; INT 3Ch
  2417 000117D4 [B30A0000]              	dd	ignore_int	; INT 3Dh	
  2418 000117D8 [B30A0000]              	dd	ignore_int	; INT 3Eh
  2419 000117DC [B30A0000]              	dd	ignore_int	; INT 3Fh
  2420 000117E0 [10C60000]              	dd	sysent		; INT 40h : !!! TRDOS 386 System Calls !!!
  2421                                  	;dd	ignore_int
  2422 000117E4 00000000                	dd	0
  2423                                  
  2424                                  ; 20/08/2014
  2425                                    ; /* This is the default interrupt "handler" :-) */ 
  2426                                    ; Linux v0.12 (head.s)
  2427                                  int_msg:
  2428 000117E8 556E6B6E6F776E2069-     	db "Unknown interrupt ! ", 0
  2428 000117F1 6E7465727275707420-
  2428 000117FA 212000             
  2429                                  
  2430                                  ; 15/04/2016
  2431                                  ; TRDOS 386 (TRDOS v2.0)
  2432                                  
  2433                                  ; 29/04/2016
  2434                                  int30h:
  2435                                  trdos_isc_routine:
  2436                                  	; 02/05/2016
  2437                                  	; 01/05/2016
  2438                                  	; 29/04/2016
  2439                                  	; 18/04/2016
  2440                                  	; 15/04/2016 (TRDOS 386 = TRDOS v2.0)
  2441                                  	; 17/04/2011 (TRDOS v1.0, 'IFC.ASM')
  2442                                  	; 03/02/2011 ('trdos_ifc_routine')
  2443                                  	;
  2444 000117FD 8B1C24                  	mov	ebx, [esp] ; EIP (next)
  2445 00011800 83EB02                  	sub	ebx, 2 ; EIP (CD ##h)
  2446                                  
  2447 00011803 89C1                    	mov	ecx, eax
  2448 00011805 8A4301                  	mov	al, [ebx+1] ; CDh ##h
  2449                                  
  2450 00011808 66BA1000                	mov	dx, KDATA
  2451 0001180C 8EDA                    	mov	ds, dx
  2452 0001180E 8EC2                    	mov	es, dx
  2453                                  
  2454 00011810 FC                      	cld
  2455 00011811 8B15[C0580100]          	mov	edx, [k_page_dir]
  2456 00011817 0F22DA                  	mov	cr3, edx
  2457                                  
  2458 0001181A E8B31AFFFF              	call	bytetohex
  2459 0001181F 66A3[53140100]          	mov	[int_num_str], ax
  2460                                  
  2461 00011825 89D8                    	mov	eax, ebx ; EIP
  2462 00011827 E8E61AFFFF              	call	dwordtohex
  2463 0001182C 8915[6F140100]          	mov	[eip_str], edx
  2464 00011832 A3[73140100]            	mov	[eip_str+4], eax
  2465                                  
  2466 00011837 89C8                    	mov	eax, ecx
  2467 00011839 E8D41AFFFF              	call	dwordtohex
  2468 0001183E 8915[5E140100]          	mov	[eax_str], edx
  2469 00011844 A3[62140100]            	mov	[eax_str+4], eax 	
  2470                                  
  2471 00011849 43                      	inc	ebx
  2472 0001184A 8A03                    	mov	al, [ebx] ; Interrupt number
  2473                                  
  2474                                  trdos_isc_handler:
  2475 0001184C 80FE30                  	cmp	dh, 30h ; Retro UNIX, SINGLIX System calls
  2476 0001184F 7507                    	jne	short trdos_usi_handler
  2477 00011851 BE[F0130100]            	mov	esi, isc_msg
  2478 00011856 EB05                    	jmp	short loc_write_inv_system_call_msg
  2479                                  
  2480                                  trdos_usi_handler:
  2481 00011858 BE[06140100]            	mov	esi, usi_msg
  2482                                  
  2483                                  loc_write_inv_system_call_msg:
  2484 0001185D E86B4BFFFF              	call	print_msg
  2485                                  	; 29/04/2016
  2486 00011862 BE[3C140100]            	mov	esi, inv_msg_for_trdos_v2
  2487 00011867 E8614BFFFF              	call	print_msg
  2488                                  
  2489                                  loc_ifc_terminate_process:
  2490                                  	; u.uno = process number
  2491                                  	; 29/04/2016
  2492                                  
  2493                                  	; 02/05/2016
  2494 0001186C FE05[5B030300]          	inc	byte [sysflg] ; 0FFh -> 0
  2495                                  
  2496 00011872 B801000000              	mov	eax, 1
  2497 00011877 E96DB0FFFF              	jmp	sysexit
  2498                                  
  2499                                  ; 07/03/2015
  2500                                  ; Temporary Code
  2501                                  display_disks:
  2502 0001187C 803D[565D0000]00        	cmp 	byte [fd0_type], 0
  2503 00011883 7605                    	jna 	short ddsks1
  2504 00011885 E87D000000              	call	pdskm
  2505                                  ddsks1:
  2506 0001188A 803D[575D0000]00        	cmp	byte [fd1_type], 0
  2507 00011891 760C                    	jna	short ddsks2
  2508 00011893 C605[D7190100]31        	mov	byte [dskx], '1'
  2509 0001189A E868000000              	call	pdskm
  2510                                  ddsks2:
  2511 0001189F 803D[585D0000]00        	cmp	byte [hd0_type], 0
  2512 000118A6 7654                    	jna	short ddsk6
  2513 000118A8 66C705[D5190100]68-     	mov	word [dsktype], 'hd'
  2513 000118B0 64                 
  2514 000118B1 C605[D7190100]30        	mov	byte [dskx], '0'
  2515 000118B8 E84A000000              	call	pdskm
  2516                                  ddsks3:
  2517 000118BD 803D[595D0000]00        	cmp	byte [hd1_type], 0
  2518 000118C4 7636                    	jna	short ddsk6
  2519 000118C6 C605[D7190100]31        	mov	byte [dskx], '1'
  2520 000118CD E835000000              	call	pdskm
  2521                                  ddsks4:
  2522 000118D2 803D[5A5D0000]00        	cmp	byte [hd2_type], 0
  2523 000118D9 7621                    	jna	short ddsk6
  2524 000118DB C605[D7190100]32        	mov	byte [dskx], '2'
  2525 000118E2 E820000000              	call	pdskm
  2526                                  ddsks5:
  2527 000118E7 803D[5B5D0000]00        	cmp	byte [hd3_type], 0
  2528 000118EE 760C                    	jna	short ddsk6
  2529 000118F0 C605[D7190100]33        	mov	byte [dskx], '3'
  2530 000118F7 E80B000000              	call	pdskm
  2531                                  ddsk6:
  2532 000118FC BE[FF190100]            	mov	esi, nextline
  2533 00011901 E806000000              	call	pdskml
  2534                                  pdskm_ok:
  2535 00011906 C3                      	retn
  2536                                  pdskm:
  2537 00011907 BE[D3190100]            	mov	esi, dsk_ready_msg
  2538                                  pdskml:	
  2539 0001190C AC                      	lodsb
  2540 0001190D 08C0                    	or	al, al
  2541 0001190F 74F5                    	jz	short pdskm_ok
  2542 00011911 56                      	push	esi
  2543                                  	; 13/05/2016
  2544 00011912 BB07000000                      mov     ebx, 7  ; Black background, 
  2545                                  			; light gray forecolor
  2546                                  			; Video page 0 (bh=0)
  2547 00011917 E89F03FFFF              	call	_write_tty
  2548 0001191C 5E                      	pop	esi
  2549 0001191D EBED                    	jmp	short pdskml
  2550                                  
  2551 0001191F 90                      Align 2
  2552                                  	; 21/08/2014
  2553                                  exc_msg:
  2554 00011920 435055206578636570-     	db "CPU exception ! "
  2554 00011929 74696F6E202120     
  2555                                  excnstr: 		; 25/08/2014
  2556 00011930 3F3F68202045495020-     	db "??h", "  EIP : "
  2556 00011939 3A20               
  2557                                  EIPstr: ; 29/08/2014
  2558 0001193B 00<rept>                	times 12 db 0
  2559                                  
  2560                                  	; 23/02/2015
  2561                                  	; 25/08/2014
  2562                                  ;scounter:
  2563                                  ;	db 5
  2564                                  ;	db 19
  2565                                  
  2566                                  ; 06/11/2014
  2567                                  ; Memory Information message
  2568                                  ; 14/08/2015
  2569                                  msg_memory_info:
  2570 00011947 07                      	db	07h
  2571 00011948 0D0A                    	db	0Dh, 0Ah
  2572                                  	;db 	"MEMORY ALLOCATION INFO", 0Dh, 0Ah, 0Dh, 0Ah
  2573 0001194A 546F74616C206D656D-     	db	"Total memory : "
  2573 00011953 6F7279203A20       
  2574                                  mem_total_b_str: ; 10 digits
  2575 00011959 303030303030303030-     	db	"0000000000 bytes", 0Dh, 0Ah
  2575 00011962 302062797465730D0A 
  2576 0001196B 202020202020202020-     	db	"               ", 20h, 20h, 20h
  2576 00011974 202020202020202020 
  2577                                  mem_total_p_str: ; 7 digits
  2578 0001197D 303030303030302070-     	db	"0000000 pages", 0Dh, 0Ah
  2578 00011986 616765730D0A       
  2579 0001198C 0D0A                    	db 	0Dh, 0Ah
  2580 0001198E 46726565206D656D6F-     	db	"Free memory  : "
  2580 00011997 727920203A20       
  2581                                  free_mem_b_str:  ; 10 digits
  2582 0001199D 3F3F3F3F3F3F3F3F3F-     	db	"?????????? bytes", 0Dh, 0Ah
  2582 000119A6 3F2062797465730D0A 
  2583 000119AF 202020202020202020-     	db	"               ", 20h, 20h, 20h
  2583 000119B8 202020202020202020 
  2584                                  free_mem_p_str:  ; 7 digits
  2585 000119C1 3F3F3F3F3F3F3F2070-     	db	"??????? pages", 0Dh, 0Ah
  2585 000119CA 616765730D0A       
  2586 000119D0 0D0A00                  	db	0Dh, 0Ah, 0
  2587                                  
  2588                                  dsk_ready_msg:
  2589 000119D3 0D0A                    	db 	0Dh, 0Ah
  2590                                  dsktype:
  2591 000119D5 6664                    	db	'fd'
  2592                                  dskx:
  2593 000119D7 30                      	db	'0'
  2594 000119D8 20                      	db	20h
  2595 000119D9 697320524541445920-     	db 	'is READY ...'
  2595 000119E2 2E2E2E             
  2596 000119E5 00                      	db 	0
  2597                                  
  2598                                  setup_error_msg:
  2599 000119E6 0D0A                    	db 0Dh, 0Ah
  2600 000119E8 4469736B2053657475-     	db 'Disk Setup Error !' 
  2600 000119F1 70204572726F722021 
  2601 000119FA 0D0A00                  	db 0Dh, 0Ah,0
  2602                                  
  2603                                  next2line: ; 08/02/2016
  2604 000119FD 0D0A                    	db	0Dh, 0Ah
  2605                                  nextline:
  2606 000119FF 0D0A00                  	db 	0Dh, 0Ah, 0
  2607                                  
  2608                                  ; KERNEL - SYSINIT Messages
  2609                                  ; 24/08/2015
  2610                                  ; 13/04/2015 - (Retro UNIX 386 v1 Beginning)
  2611                                  ; 14/07/2013
  2612                                  ;kernel_init_err_msg:
  2613                                  ;	db 0Dh, 0Ah
  2614                                  ;	db 07h
  2615                                  ;	db 'Kernel initialization ERROR !'
  2616                                  ;	db 0Dh, 0Ah, 0 
  2617                                  
  2618                                  ;welcome_msg: 
  2619                                  ;	db 0Dh, 0Ah
  2620                                  ;	db 07h
  2621                                  ;	db 'Welcome to TRDOS 386 Operating System !'
  2622                                  ;	db 0Dh, 0Ah
  2623                                  ;	db 'by Erdogan Tan - 31/12/2017 (v2.0.0)'
  2624                                  ;	db 0Dh, 0Ah, 0
  2625                                  
  2626                                  panic_msg:
  2627 00011A02 0D0A07                  	db 0Dh, 0Ah, 07h
  2628 00011A05 4552524F523A204B65-     	db 'ERROR: Kernel Panic !'
  2628 00011A0E 726E656C2050616E69-
  2628 00011A17 632021             
  2629 00011A1A 0D0A00                  	db 0Dh, 0Ah, 0
  2630                                  
  2631                                  ;msgl_drv_not_ready: 
  2632                                  ;	db 07h, 0Dh, 0Ah
  2633                                  ;       db 'Drive not ready or read error !'
  2634                                  ;       db 0Dh, 0Ah, 0
  2635                                  
  2636                                  starting_msg:
  2637 00011A1D 5475726B6973682052-     	db "Turkish Rational DOS v2.0 [01/09/2020] ...", 0
  2637 00011A26 6174696F6E616C2044-
  2637 00011A2F 4F532076322E30205B-
  2637 00011A38 30312F30392F323032-
  2637 00011A41 305D202E2E2E00     
  2638                                  NextLine:
  2639 00011A48 0D0A00                  	db 0Dh, 0Ah, 0
  2640                                  
  2641                                  %include 'audio.s' ; 03/04/2017
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.2 - audio.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 01/09/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 03/04/2017
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ****************************************************************************
    10                              <1> 
    11                              <1> ; AUDIO CONTROLLER & CODEC DEFINITIONS & CODE FOR TRDOS 386
    12                              <1> 
    13                              <1> ;=============================================================================
    14                              <1> ;               EQUATES
    15                              <1> ;=============================================================================
    16                              <1> 
    17                              <1> ; PCI EQUATES
    18                              <1> 
    19                              <1> BIT0  EQU 1
    20                              <1> BIT1  EQU 2
    21                              <1> BIT2  EQU 4
    22                              <1> BIT3  EQU 8
    23                              <1> BIT4  EQU 10h
    24                              <1> BIT5  EQU 20h
    25                              <1> BIT6  EQU 40h
    26                              <1> BIT7  EQU 80h
    27                              <1> BIT8  EQU 100h
    28                              <1> BIT9  EQU 200h
    29                              <1> BIT10 EQU 400h
    30                              <1> BIT11 EQU 800h
    31                              <1> BIT12 EQU 1000h
    32                              <1> BIT13 EQU 2000h
    33                              <1> BIT14 EQU 4000h
    34                              <1> BIT15 EQU 8000h
    35                              <1> BIT16 EQU 10000h
    36                              <1> BIT17 EQU 20000h
    37                              <1> BIT18 EQU 40000h
    38                              <1> BIT19 EQU 80000h
    39                              <1> BIT20 EQU 100000h
    40                              <1> BIT21 EQU 200000h
    41                              <1> BIT22 EQU 400000h
    42                              <1> BIT23 EQU 800000h
    43                              <1> BIT24 EQU 1000000h
    44                              <1> BIT25 EQU 2000000h
    45                              <1> BIT26 EQU 4000000h
    46                              <1> BIT27 EQU 8000000h
    47                              <1> BIT28 EQU 10000000h
    48                              <1> BIT29 EQU 20000000h
    49                              <1> BIT30 EQU 40000000h
    50                              <1> BIT31 EQU 80000000h
    51                              <1> NOT_BIT31 EQU 7FFFFFFFh
    52                              <1> 
    53                              <1> ; PCI equates
    54                              <1> ; PCI function address (PFA)
    55                              <1> ; bit 31 = 1
    56                              <1> ; bit 23:16 = bus number     (0-255)
    57                              <1> ; bit 15:11 = device number  (0-31)
    58                              <1> ; bit 10:8 = function number (0-7)
    59                              <1> ; bit 7:0 = register number  (0-255)
    60                              <1> 
    61                              <1> IO_ADDR_MASK    EQU     0FFFEh	; mask off bit 0 for reading BARs
    62                              <1> PCI_INDEX_PORT  EQU     0CF8h
    63                              <1> PCI_DATA_PORT   EQU     0CFCh
    64                              <1> PCI32           EQU     BIT31	; bitflag to signal 32bit access
    65                              <1> PCI16           EQU     BIT30	; bitflag for 16bit access
    66                              <1> NOT_PCI32_PCI16	EQU	03FFFFFFFh ; NOT BIT31+BIT30 ; 19/03/2017
    67                              <1> 
    68                              <1> PCI_FN0         EQU     0 << 8
    69                              <1> PCI_FN1         EQU     1 << 8
    70                              <1> PCI_FN2         EQU     2 << 8
    71                              <1> PCI_FN3         EQU     3 << 8
    72                              <1> PCI_FN4         EQU     4 << 8
    73                              <1> PCI_FN5         EQU     5 << 8
    74                              <1> PCI_FN6         EQU     6 << 8
    75                              <1> PCI_FN7         EQU     7 << 8
    76                              <1> 
    77                              <1> PCI_CMD_REG	EQU	04h	; reg 04, command reg
    78                              <1> IO_ENA		EQU	BIT0	; i/o decode enable
    79                              <1> MEM_ENA		EQU	BIT1	; memory decode enable
    80                              <1> BM_ENA		EQU     BIT2	; bus master enable
    81                              <1> 
    82                              <1> ; VIA VT8233 EQUATES
    83                              <1> 
    84                              <1> VIA_VID		equ 1106h	; VIA's PCI vendor ID
    85                              <1> VT8233_DID      equ 3059h	; VT8233 (VT8235) device ID
    86                              <1> 		
    87                              <1> PCI_IO_BASE          equ 10h
    88                              <1> AC97_INT_LINE        equ 3Ch
    89                              <1> VIA_ACLINK_CTRL      equ 41h
    90                              <1> VIA_ACLINK_STAT      equ 40h
    91                              <1> VIA_ACLINK_C00_READY equ 01h ; primary codec ready
    92                              <1> 	
    93                              <1> VIA_REG_AC97	     equ 80h ; dword
    94                              <1> 
    95                              <1> VIA_ACLINK_CTRL_ENABLE	equ   80h ; 0: disable, 1: enable
    96                              <1> VIA_ACLINK_CTRL_RESET	equ   40h ; 0: assert, 1: de-assert
    97                              <1> VIA_ACLINK_CTRL_SYNC	equ   20h ; 0: release SYNC, 1: force SYNC hi
    98                              <1> VIA_ACLINK_CTRL_VRA	equ   08h ; 0: disable VRA, 1: enable VRA
    99                              <1> VIA_ACLINK_CTRL_PCM	equ   04h ; 0: disable PCM, 1: enable PCM
   100                              <1> 					; 3D Audio Channel slots 3/4
   104                              <1> VIA_ACLINK_CTRL_INIT	equ  (VIA_ACLINK_CTRL_ENABLE +                               VIA_ACLINK_CTRL_RESET +                               VIA_ACLINK_CTRL_PCM +                               VIA_ACLINK_CTRL_VRA)
   105                              <1> 
   106                              <1> CODEC_AUX_VOL		equ   04h
   107                              <1> VIA_REG_AC97_BUSY	equ   01000000h ;(1<<24) 
   108                              <1> VIA_REG_AC97_CMD_SHIFT	equ   10h ; 16
   109                              <1> VIA_REG_AC97_PRIMARY_VALID equ 02000000h ;(1<<25)
   110                              <1> VIA_REG_AC97_READ	equ   00800000h ;(1<<23)
   111                              <1> VIA_REG_AC97_CODEC_ID_SHIFT   equ  1Eh ; 30
   112                              <1> VIA_REG_AC97_CODEC_ID_PRIMARY equ  0
   113                              <1> VIA_REG_AC97_DATA_SHIFT equ   0
   114                              <1> VIADEV_PLAYBACK         equ   0
   115                              <1> VIA_REG_OFFSET_STATUS   equ   0    ;; byte - channel status
   116                              <1> VIA_REG_OFFSET_CONTROL  equ   01h  ;; byte - channel control
   117                              <1> VIA_REG_CTRL_START	equ   80h  ;; WO
   118                              <1> VIA_REG_CTRL_TERMINATE  equ   40h  ;; WO
   119                              <1> VIA_REG_CTRL_PAUSE      equ   08h  ;; RW
   120                              <1> VIA_REG_CTRL_RESET      equ   01h  ;; RW - probably reset? undocumented
   121                              <1> VIA_REG_OFFSET_STOP_IDX equ   08h  ;; dword - stop index, channel type, sample rate
   122                              <1> VIA8233_REG_TYPE_16BIT  equ   200000h ;; RW
   123                              <1> VIA8233_REG_TYPE_STEREO equ   100000h ;; RW
   124                              <1> VIA_REG_OFFSET_CURR_INDEX equ 0Fh ;; byte - channel current index (for via8233 only)
   125                              <1> VIA_REG_OFFSET_TABLE_PTR equ  04h  ;; dword - channel table pointer
   126                              <1> VIA_REG_OFFSET_CURR_PTR equ   04h  ;; dword - channel current pointer
   127                              <1> VIA_REG_OFS_PLAYBACK_VOLUME_L equ  02h ;; byte
   128                              <1> VIA_REG_OFS_PLAYBACK_VOLUME_R equ  03h ;; byte
   129                              <1> VIA_REG_CTRL_AUTOSTART	equ   20h
   130                              <1> VIA_REG_CTRL_INT_EOL	equ   02h
   131                              <1> VIA_REG_CTRL_INT_FLAG	equ   01h
   134                              <1> VIA_REG_CTRL_INT	equ  (VIA_REG_CTRL_INT_FLAG +                               VIA_REG_CTRL_INT_EOL +                               VIA_REG_CTRL_AUTOSTART)
   135                              <1> 
   136                              <1> VIA_REG_STAT_STOP_IDX	equ   10h    ;; RO ; 27/07/2020
   137                              <1> 				     ; current index = stop index
   138                              <1> VIA_REG_STAT_STOPPED	equ   04h    ;; RWC
   139                              <1> VIA_REG_STAT_EOL	equ   02h    ;; RWC
   140                              <1> VIA_REG_STAT_FLAG	equ   01h    ;; RWC
   141                              <1> VIA_REG_STAT_ACTIVE	equ   80h    ;; RO
   142                              <1> ; 28/11/2016
   143                              <1> VIA_REG_STAT_LAST	equ   40h    ;; RO
   144                              <1> VIA_REG_STAT_TRIGGER_QUEUED equ 08h  ;; RO
   145                              <1> VIA_REG_CTRL_INT_STOP	equ   04h  ; Interrupt on Current Index = Stop Index
   146                              <1> 		   		   ; and End of Block
   147                              <1> 
   148                              <1> VIA_REG_OFFSET_CURR_COUNT equ 0Ch ;; dword - channel current count, index
   149                              <1> 
   150                              <1> PORTB		EQU	061h
   151                              <1> REFRESH_STATUS	EQU	010h	; Refresh signal status
   152                              <1> 
   153                              <1> ; AC97 Codec registers.
   154                              <1> 
   155                              <1> ; 22/07/2020
   156                              <1> ; REALTEK ALC655 and ADI SOUNDMAX AD1980 CODEC MIXER REGISTERS
   157                              <1> 
   158                              <1> ; each codec/mixer register is 16bits
   159                              <1> 
   160                              <1> CODEC_RESET_REG                 equ     00h	; reset codec
   161                              <1> CODEC_MASTER_VOL_REG            equ     02h	; master volume
   162                              <1> CODEC_HP_VOL_REG                equ     04h	; headphone volume ; AD1980
   163                              <1> CODEC_MASTER_MONO_VOL_REG       equ     06h	; master mono volume (mono-out)
   164                              <1> ;CODEC_MASTER_TONE_REG          equ     08h	; master tone (R+L) ; (not used)
   165                              <1> CODEC_PCBEEP_VOL_REG            equ     0Ah	; PC beep volume ; ALC655
   166                              <1> CODEC_PHONE_VOL_REG             equ     0Ch	; phone volume
   167                              <1> CODEC_MIC_VOL_REG               equ     0Eh	; mic volume
   168                              <1> CODEC_LINE_IN_VOL_REG           equ     10h	; line in volume
   169                              <1> CODEC_CD_VOL_REG                equ     12h	; CD volume
   170                              <1> ;CODEC_VID_VOL_REG              equ     14h	; video volume ; (not used)
   171                              <1> CODEC_AUX_VOL_REG               equ     16h	; aux volume
   172                              <1> CODEC_PCM_OUT_REG               equ     18h	; PCM out volume
   173                              <1> CODEC_RECORD_SELECT_REG         equ     1Ah	; record select
   174                              <1> CODEC_RECORD_VOL_REG            equ     1Ch	; record volume (record gain)
   175                              <1> ;CODEC_RECORD_MIC_VOL_REG       equ     1Eh	; record mic volume ; (not used)
   176                              <1> CODEC_GP_REG                    equ     20h	; general purpose
   177                              <1> ;CODEC_3D_CONTROL_REG           equ     22h	; 3D control
   178                              <1> ;;CODEC_AUDIO_INT_PAGING_REG    equ	24h	; audio int & paging ; (not used) 
   179                              <1> CODEC_POWER_CTRL_REG            equ     26h	; power down control
   180                              <1> CODEC_EXT_AUDIO_REG             equ     28h	; extended audio ID
   181                              <1> CODEC_EXT_AUDIO_CTRL_REG        equ     2Ah	; extended audio status/control
   182                              <1> CODEC_PCM_FRONT_DACRATE_REG     equ     2Ch	; PCM front sample rate
   183                              <1> CODEC_PCM_SURND_DACRATE_REG     equ     2Eh	; PCM surround sample rate
   184                              <1> CODEC_PCM_LFE_DACRATE_REG       equ     30h	; PCM Center/LFE sample rate
   185                              <1> CODEC_LR_ADCRATE_REG            equ     32h	; PCM input sample rate
   186                              <1> CODEC_MIC_ADCRATE_REG           equ     34h	; mic in sample rate  ; AD1980
   187                              <1> CODEC_PCM_LFE_VOL_REG           equ     36h	; PCM Center/LFE volume
   188                              <1> CODEC_PCM_SURND_VOL_REG         equ     38h	; PCM surround volume
   189                              <1> ;CODEC_SPDIF_CTRL_REG           equ     3Ah	; S/PDIF control
   190                              <1> ; 22/07/2020
   191                              <1> CODEC_MISC_CRTL_BITS_REG	equ	76h	; misc control bits ; AD1980
   192                              <1> ;	
   193                              <1> CODEC_VENDOR_ID1		equ	7Ch	; REALTEK: 414Ch, ADI: 4144h	
   194                              <1> CODEC_VENDOR_ID2		equ	7Eh	; REALTEK: 4760h, ADI: 5370h	
   195                              <1> 
   196                              <1> ; VT8233 SGD bits (21/04/2017)
   197                              <1> FLAG	EQU BIT30
   198                              <1> EOL	EQU BIT31
   199                              <1> 
   200                              <1> ; INTEL ICH EQUATES
   201                              <1> ; 28/05/2017
   202                              <1> INTEL_VID	equ	8086h	; Intel's PCI vendor ID
   203                              <1> ICH_DID		equ	2415h	; ICH (82801AA) device ID
   204                              <1> NAMBAR_REG      equ	10h	; native audio mixer Base Address Register
   205                              <1> NABMBAR_REG     equ	14h	; native audio bus mastering Base Addr Reg
   206                              <1> 
   207                              <1> PI_CR_REG       equ     0Bh     ; PCM in Control Register
   208                              <1> PO_CR_REG	equ     1Bh     ; PCM out Control Register
   209                              <1> MC_CR_REG	equ     2Bh     ; MIC in Control Register
   210                              <1> 
   211                              <1> PI_SR_REG	equ     6       ; PCM in Status register
   212                              <1> PO_SR_REG	equ     16h     ; PCM out Status register
   213                              <1> MC_SR_REG	equ     26h     ; MIC in Status register
   214                              <1> 
   215                              <1> IOCE 		equ     BIT4    ; interrupt on complete enable.
   216                              <1> FEIFE		equ     BIT3    ; set if you want an interrupt to fire
   217                              <1> LVBIE		equ     BIT2    ; last valid buffer interrupt enable.
   218                              <1> RR 		equ     BIT1    ; reset registers. Nukes all regs
   219                              <1>                                 ; except bits 4:2 of this register.
   220                              <1>                                 ; Only set this bit if BIT 0 is 0
   221                              <1> RPBM		equ     BIT0    ; Run/Pause
   222                              <1> 				; set this bit to start the codec!
   223                              <1> 
   224                              <1> PI_BDBAR_REG	equ     0       ; PCM in buffer descriptor BAR
   225                              <1> PO_BDBAR_REG	equ     10h     ; PCM out buffer descriptor BAR
   226                              <1> MC_BDBAR_REG	equ     20h     ; MIC in buffer descriptor BAR
   227                              <1> 
   228                              <1> PI_CIV_REG	equ     4       ; PCM in current Index value (RO)
   229                              <1> PO_CIV_REG	equ     14h     ; PCM out current Index value (RO)
   230                              <1> MC_CIV_REG 	equ     24h     ; MIC in current Index value (RO)
   231                              <1> 
   232                              <1> PI_LVI_REG	equ     5       ; PCM in Last Valid Index
   233                              <1> PO_LVI_REG	equ     15h     ; PCM out Last Valid Index
   234                              <1> MC_LVI_REG	equ     25h     ; MIC in Last Valid Index
   235                              <1> 
   236                              <1> IOC		equ     BIT31	; Fire an interrupt whenever this
   237                              <1>                 		; buffer is complete.
   238                              <1> BUP		equ     BIT30	; Buffer Underrun Policy.
   239                              <1> 
   240                              <1> GLOB_CNT_REG	equ     2Ch     ; Global Control Register
   241                              <1> GLOB_STS_REG	equ     30h     ; Global Status register (RO)
   242                              <1> 
   243                              <1> CTRL_ST_CREADY	equ   BIT8+BIT9+BIT28 ; Primary Codec Ready
   244                              <1> 
   245                              <1> CODEC_REG_POWERDOWN   equ 26h
   246                              <1> CODEC_REG_ST          equ 26h
   247                              <1> 
   248                              <1> ; 22/06/2017
   249                              <1> PO_PICB_REG	equ 18h	; PCM Out Position In Current Buffer Register
   250                              <1> 
   251                              <1> ;=============================================================================
   252                              <1> ;               CODE
   253                              <1> ;=============================================================================
   254                              <1> 
   255                              <1> ; CODE for INTEL ICH AC'97 AUDIO CONTROLLER
   256                              <1> 
   257                              <1> DetectICH:
   258                              <1> 	; 10/06/2017
   259                              <1> 	; 05/06/2017
   260                              <1> 	; 29/05/2017
   261                              <1> 	; 28/05/2017
   262 00011A4B B886801524          <1> 	mov     eax, (ICH_DID << 16) + INTEL_VID
   263 00011A50 E876000000          <1>         call    pciFindDevice
   264 00011A55 730D                <1>         jnc     short d_ac97_1
   265                              <1> d_ac97_0:
   266                              <1> ; couldn't find the audio device!
   267 00011A57 C3                  <1> 	retn
   268                              <1> 
   269                              <1> ; CODE for VIA VT8233 AUDIO CONTROLLER
   270                              <1> 
   271                              <1> DetectVT8233:
   272                              <1> 	; 10/06/2017
   273                              <1> 	; 05/06/2017
   274                              <1> 	; 29/05/2017
   275                              <1> 	; 03/04/2017
   276 00011A58 B806115930          <1> 	mov     eax, (VT8233_DID << 16) + VIA_VID
   277 00011A5D E869000000          <1>         call    pciFindDevice
   278                              <1> ;       jnc     short d_vt8233_0
   279                              <1> ; couldn't find the audio device!
   280                              <1> ;	retn
   281 00011A62 72F3                <1> 	jc	short d_ac97_0  ; 28/05/2017
   282                              <1> d_vt8233_0:
   283                              <1> 	; 24/03/2017 ('player.asm')
   284                              <1> 	; 12/11/2016 
   285                              <1> 	; Erdogan Tan - 8/11/2016
   286                              <1> 	; References: Kolibrios - vt823x.asm (2016)
   287                              <1> 	;	      VIA VT8235 V-Link South Bridge (VT8235-VIA.PDF)(2002)
   288                              <1> 	;	      lowlevel.eu - AC97 (2016)
   289                              <1> 	;	      .wav player for DOS by Jeff Leyda (2002) -this file-
   290                              <1> 	;	      Linux kernel - via82xx.c (2016)
   291                              <1> d_ac97_1:
   292                              <1> 	; eax = BUS/DEV/FN
   293                              <1> 	;	00000000BBBBBBBBDDDDDFFF00000000
   294                              <1> 	; edx = DEV/VENDOR
   295                              <1> 	;	DDDDDDDDDDDDDDDDVVVVVVVVVVVVVVVV
   296                              <1> 
   297 00011A64 A3[486B0100]        <1> 	mov	[audio_dev_id], eax
   298 00011A69 8915[4C6B0100]      <1> 	mov	[audio_vendor], edx
   299                              <1> 
   300                              <1> 	; init controller
   301 00011A6F B004                <1> 	mov	al, PCI_CMD_REG ; command register (04h)
   302 00011A71 E8E2000000          <1> 	call	pciRegRead32
   303                              <1> 
   304                              <1> 	; eax = BUS/DEV/FN/REG
   305                              <1> 	; edx = STATUS/COMMAND
   306                              <1> 	; 	SSSSSSSSSSSSSSSSCCCCCCCCCCCCCCCC
   307 00011A76 8915[506B0100]      <1> 	mov	[audio_stats_cmd], edx
   308                              <1> 
   309 00011A7C B010                <1> 	mov	al, PCI_IO_BASE ; IO base address register (10h)
   310                              <1> 	;mov	al, NAMBAR_REG	; Native Audio Mixer BAR (10h)
   311 00011A7E E8D5000000          <1> 	call	pciRegRead32
   312                              <1> 
   313 00011A83 66813D[4C6B0100]86- <1> 	cmp	word [audio_vendor], 8086h ; AC'97 ?
   313 00011A8B 80                  <1>
   314 00011A8C 751F                <1> 	jne	short d_vt8233_1
   315                              <1> 
   316 00011A8E 6683E2FE            <1> 	and	dx, 0FFFEh ; Audio Codec IO_ADDR_MASK
   317 00011A92 668915[786B0100]    <1> 	mov	[NAMBAR], dx
   318                              <1> 
   319 00011A99 B014                <1> 	mov	al, NABMBAR_REG ; Native Audio Bus Mastering BAR (14h)
   320 00011A9B E8B8000000          <1> 	call	pciRegRead32	
   321                              <1> 
   322 00011AA0 6683E2C0            <1> 	and	dx, 0FFC0h ; Audio Controller IO_ADDR_MASK
   323 00011AA4 668915[7A6B0100]    <1> 	mov	[NABMBAR], dx
   324                              <1>         ;mov	[audio_io_base], dx
   325                              <1> 	
   326 00011AAB EB0B                <1> 	jmp	short d_ac97_2
   327                              <1> 
   328                              <1> d_vt8233_1:
   329 00011AAD 6683E2C0            <1> 	and     dx, 0FFC0h ; Audio Controller IO_ADDR_MASK 
   330 00011AB1 668915[466B0100]    <1>         mov     [audio_io_base], dx
   331                              <1> 
   332                              <1> d_ac97_2:
   333                              <1> 	; 10/06/2017
   334 00011AB8 B03C                <1> 	mov	al, AC97_INT_LINE ; Interrupt Line Register (3Ch)
   335                              <1> 	;call	pciRegRead32
   336 00011ABA E886000000          <1> 	call	pciRegRead8
   337                              <1> 
   338                              <1> 	;and 	edx, 0FFh
   339 00011ABF 6681E2FF00          <1> 	and	dx, 0FFh
   340                              <1> 
   341 00011AC4 8815[436B0100]      <1>   	mov     [audio_intr], dl
   342                              <1> 
   343 00011ACA C3                  <1> 	retn
   344                              <1> 
   345                              <1> 	;; (Note: Interrupts are already enabled by TRDOS 386 kernel!)
   346                              <1> 	;mov	cx, dx
   347                              <1> 	
   348                              <1> 	;in	al, 0A1h ; irq 8-15
   349                              <1> 	;mov	ah, al
   350                              <1> 	;in	al, 21h  ; irq 0-7 
   351                              <1> 	;btr	ax, dx	 ; unmask ; 17/03/2017
   352                              <1> 	;;bts	ax, dx   ; MASK interrupt ; 10/06/2017 
   353                              <1> 	;out	21h, al  ; irq <= 7
   354                              <1> 	;mov	al, ah
   355                              <1> 	;out	0A1h, al ; irq > 7
   356                              <1> 	;
   357                              <1> 	
   358                              <1> 	; 10/06/2017
   359                              <1> 	; === Intel ICH I/O Controller Hub Datasheet, Section 8.1.16 ===
   360                              <1> 	; PRQ[n]_ROUT Register (61h, PRQB) Bit 7:
   361                              <1> 	; Interrupt Routing Enable (IRQEN).
   362                              <1> 	; 0 = The corresponding PIRQ is routed to one of the ISA-compatible
   363                              <1> 	;     interrupts specified in bits[3:0].
   364                              <1> 	; 1 = The PIRQ is not routed to the 8259.
   365                              <1> 	; Note: If the PIRQ is intended to cause an interrupt to the ICHs 
   366                              <1> 	;	integrated I/O APIC, then this bit should be set to 0 and 
   367                              <1> 	;	the APIC_EN bit should be set to 1. 
   368                              <1> 	;	The IRQEN must be set to 0 and the PIRQ routed to 
   369                              <1> 	;	an 8259 interrupt via the IRQ Routing filed (bits[3:0).
   370                              <1> 	;	The corresponding 8259 interrupt must be masked via the 
   371                              <1> 	;	appropriated bit in the 8259s OCW1 (Interrupt Mask)
   372                              <1> 	;	register. The IOAPIC must then be enabled by setting 
   373                              <1> 	;	the APIC_EN bit in the GEN_CNTL register.
   374                              <1> 
   375                              <1> 	;mov	eax, 0F861h  ; D31:F0
   376                              <1> 		;AL=61h : PIRQ[B] Routing Control Reg, LPC interface
   377                              <1> 	;;mov	dl, [audio_intr]
   378                              <1> 	;call	pciRegWrite8
   379                              <1> 	;;mov	al, 0D0h ; General Control Register (GEN_CTL)
   380                              <1> 	;;call	pciRegRead32
   381                              <1> 	;;or	edx, 100h ; Bit 8, APIC_EN (Enable I/O APIC) 
   382                              <1> 	;;;call	pciRegWrite32
   383                              <1> 	;;and	edx, ~100h
   384                              <1> 	;;call	pciRegWrite32 ; ; Bit 8, APIC_EN (Disable I/O APIC) 
   385                              <1> 	;
   386                              <1> 
   387                              <1> 	;mov	dx, 4D1h	; 8259 ELCR2
   388                              <1>     	;in	al, dx
   389                              <1> 	;mov	ah, al
   390                              <1> 	;;mov	dx, 4D0h 	; 8259 ELCR1
   391                              <1> 	;dec	dl
   392                              <1> 	;in	al, dx
   393                              <1> 	;bts	ax, cx
   394                              <1> 	;;mov	dx, 4D0h
   395                              <1> 	;out	dx, al		; set level-triggered mode
   396                              <1> 	;mov	al, ah ; 29/05/2017
   397                              <1> 	;;mov	dx, 4D1h
   398                              <1> 	;inc	dl
   399                              <1> 	;out	dx, al		; set level-triggered mode
   400                              <1> 
   401                              <1> 	;xor	eax, eax ; 0
   402                              <1> 
   403                              <1> 	;retn
   404                              <1> 
   405                              <1> ; CODE for PCI
   406                              <1> 
   407                              <1> pciFindDevice:
   408                              <1> 	; 03/04/2017 ('pci.asm', 20/03/2017)
   409                              <1> 	;
   410                              <1> 	; scan through PCI space looking for a device+vendor ID
   411                              <1> 	;
   412                              <1> 	; Entry: EAX=Device+Vendor ID
   413                              <1> 	;
   414                              <1> 	; Exit: EAX=PCI address if device found
   415                              <1> 	;	 EDX=Device+Vendor ID
   416                              <1> 	;        CY clear if found, set if not found. EAX invalid if CY set.
   417                              <1> 	;
   418                              <1> 	; Destroys: ebx, esi, edi, cl
   419                              <1> 	;
   420                              <1> 
   421                              <1> 	;push	ecx
   422 00011ACB 50                  <1> 	push	eax
   423                              <1> 	;push	esi
   424                              <1> 	;push	edi
   425                              <1> 
   426 00011ACC 89C6                <1>         mov     esi, eax                ; save off vend+device ID
   427 00011ACE BF00FFFF7F          <1>         mov     edi, (80000000h - 100h) ; start with bus 0, dev 0 func 0
   428                              <1> 
   429                              <1> nextPCIdevice:
   430 00011AD3 81C700010000        <1>         add     edi, 100h
   431 00011AD9 81FF00F8FF80        <1>         cmp     edi, 80FFF800h		; scanned all devices?
   432 00011ADF F9                  <1>         stc
   433 00011AE0 740C                <1>         je      short PCIScanExit       ; not found
   434                              <1> 
   435 00011AE2 89F8                <1>         mov     eax, edi                ; read PCI registers
   436 00011AE4 E86F000000          <1>         call    pciRegRead32
   437 00011AE9 39F2                <1>         cmp     edx, esi                ; found device?
   438 00011AEB 75E6                <1>         jne     short nextPCIdevice
   439 00011AED F8                  <1>         clc
   440                              <1> 
   441                              <1> PCIScanExit:
   442 00011AEE 9C                  <1> 	pushf
   443 00011AEF B8FFFFFF7F          <1> 	mov	eax, NOT_BIT31 	; 19/03/2017
   444 00011AF4 21F8                <1> 	and	eax, edi	; return only bus/dev/fn #
   445 00011AF6 9D                  <1> 	popf
   446                              <1> 
   447                              <1> 	;pop	edi
   448                              <1> 	;pop	esi
   449 00011AF7 5A                  <1> 	pop	edx
   450                              <1> 	;pop	ecx
   451 00011AF8 C3                  <1> 	retn
   452                              <1> 
   453                              <1> pciRegRead:
   454                              <1> 	; 03/04/2017 ('pci.asm', 20/03/2017)
   455                              <1> 	;
   456                              <1> 	; 8/16/32bit PCI reader
   457                              <1> 	;
   458                              <1> 	; Entry: EAX=PCI Bus/Device/fn/register number
   459                              <1> 	;           BIT30 set if 32 bit access requested
   460                              <1> 	;           BIT29 set if 16 bit access requested
   461                              <1> 	;           otherwise defaults to 8 bit read
   462                              <1> 	;
   463                              <1> 	; Exit:  DL,DX,EDX register data depending on requested read size
   464                              <1> 	;
   465                              <1> 	; Note1: this routine is meant to be called via pciRegRead8,
   466                              <1> 	;	 pciRegread16 or pciRegRead32, listed below.
   467                              <1> 	;
   468                              <1> 	; Note2: don't attempt to read 32 bits of data from a non dword
   469                              <1> 	;	 aligned reg number. Likewise, don't do 16 bit reads from
   470                              <1> 	;	 non word aligned reg #
   471                              <1> 	
   472 00011AF9 53                  <1> 	push	ebx
   473 00011AFA 51                  <1> 	push	ecx
   474 00011AFB 89C3                <1>         mov     ebx, eax		; save eax, dh
   475 00011AFD 88F1                <1>         mov     cl, dh
   476                              <1> 
   477 00011AFF 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; clear out data size request
   478 00011B04 0D00000080          <1>         or      eax, BIT31		; make a PCI access request
   479 00011B09 24FC                <1>         and     al, ~3 ; NOT 3		; force index to be dword
   480                              <1> 
   481 00011B0B 66BAF80C            <1>         mov     dx, PCI_INDEX_PORT
   482 00011B0F EF                  <1>         out	dx, eax			; write PCI selector
   483                              <1> 	
   484 00011B10 66BAFC0C            <1>         mov     dx, PCI_DATA_PORT
   485 00011B14 88D8                <1>         mov     al, bl
   486 00011B16 2403                <1>         and     al, 3			; figure out which port to
   487 00011B18 00C2                <1>         add     dl, al			; read to
   488                              <1> 
   489 00011B1A F7C3000000C0        <1> 	test    ebx, PCI32+PCI16
   490 00011B20 7507                <1>         jnz     short _pregr0
   491 00011B22 EC                  <1> 	in	al, dx			; return 8 bits of data
   492 00011B23 88C2                <1>         mov	dl, al
   493 00011B25 88CE                <1> 	mov     dh, cl			; restore dh for 8 bit read
   494 00011B27 EB12                <1> 	jmp	short _pregr2
   495                              <1> _pregr0:	
   496 00011B29 F7C300000080        <1> 	test    ebx, PCI32
   497 00011B2F 7507                <1>         jnz	short _pregr1
   498 00011B31 66ED                <1> 	in	ax, dx
   499 00011B33 6689C2              <1>         mov     dx, ax			; return 16 bits of data
   500 00011B36 EB03                <1> 	jmp	short _pregr2
   501                              <1> _pregr1:
   502 00011B38 ED                  <1> 	in	eax, dx			; return 32 bits of data
   503 00011B39 89C2                <1> 	mov	edx, eax
   504                              <1> _pregr2:
   505 00011B3B 89D8                <1> 	mov     eax, ebx		; restore eax
   506 00011B3D 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; clear out data size request
   507 00011B42 59                  <1> 	pop	ecx
   508 00011B43 5B                  <1> 	pop	ebx
   509 00011B44 C3                  <1> 	retn
   510                              <1> 
   511                              <1> pciRegRead8:
   512 00011B45 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 8 bit read size
   513 00011B4A EBAD                <1>         jmp     short pciRegRead	; call generic PCI access
   514                              <1> 
   515                              <1> pciRegRead16:
   516 00011B4C 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 16 bit read size
   517 00011B51 0D00000040          <1>         or      eax, PCI16		; call generic PCI access
   518 00011B56 EBA1                <1>         jmp     short pciRegRead
   519                              <1> 
   520                              <1> pciRegRead32:
   521 00011B58 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 32 bit read size
   522 00011B5D 0D00000080          <1>         or      eax, PCI32		; call generic PCI access
   523 00011B62 EB95                <1>         jmp     pciRegRead
   524                              <1> 
   525                              <1> pciRegWrite:
   526                              <1> 	; 03/04/2017 ('pci.asm', 29/11/2016)
   527                              <1> 	;
   528                              <1> 	; 8/16/32bit PCI writer
   529                              <1> 	;
   530                              <1> 	; Entry: EAX=PCI Bus/Device/fn/register number
   531                              <1> 	;           BIT31 set if 32 bit access requested
   532                              <1> 	;           BIT30 set if 16 bit access requested
   533                              <1> 	;           otherwise defaults to 8bit read
   534                              <1> 	;        DL/DX/EDX data to write depending on size
   535                              <1> 	;
   536                              <1> 	; Note1: this routine is meant to be called via pciRegWrite8, 
   537                              <1> 	;	 pciRegWrite16 or pciRegWrite32 as detailed below.
   538                              <1> 	;
   539                              <1> 	; Note2: don't attempt to write 32bits of data from a non dword
   540                              <1> 	;	 aligned reg number. Likewise, don't do 16 bit writes from
   541                              <1> 	;	 non word aligned reg #
   542                              <1> 
   543 00011B64 53                  <1> 	push	ebx
   544 00011B65 51                  <1> 	push	ecx
   545 00011B66 89C3                <1>         mov     ebx, eax		; save eax, edx
   546 00011B68 89D1                <1>         mov     ecx, edx
   547 00011B6A 25FFFFFF3F          <1> 	and     eax, NOT_PCI32_PCI16	; clear out data size request
   548 00011B6F 0D00000080          <1>         or      eax, BIT31		; make a PCI access request
   549 00011B74 24FC                <1>         and     al, ~3 ; NOT 3		; force index to be dword
   550                              <1> 
   551 00011B76 66BAF80C            <1>         mov     dx, PCI_INDEX_PORT
   552 00011B7A EF                  <1>         out	dx, eax			; write PCI selector
   553                              <1> 	
   554 00011B7B 66BAFC0C            <1>         mov     dx, PCI_DATA_PORT
   555 00011B7F 88D8                <1>         mov     al, bl
   556 00011B81 2403                <1>         and     al, 3			; figure out which port to
   557 00011B83 00C2                <1>         add     dl, al			; write to
   558                              <1> 
   559 00011B85 F7C3000000C0        <1> 	test    ebx, PCI32+PCI16
   560 00011B8B 7505                <1>         jnz     short _pregw0
   561 00011B8D 88C8                <1> 	mov	al, cl 			; put data into al
   562 00011B8F EE                  <1> 	out	dx, al
   563 00011B90 EB12                <1> 	jmp	short _pregw2
   564                              <1> _pregw0:
   565 00011B92 F7C300000080        <1> 	test    ebx, PCI32
   566 00011B98 7507                <1>         jnz     short _pregw1
   567 00011B9A 6689C8              <1> 	mov	ax, cx			; put data into ax
   568 00011B9D 66EF                <1> 	out	dx, ax
   569 00011B9F EB03                <1> 	jmp	short _pregw2
   570                              <1> _pregw1:
   571 00011BA1 89C8                <1> 	mov	eax, ecx		; put data into eax 		
   572 00011BA3 EF                  <1> 	out	dx, eax
   573                              <1> _pregw2:
   574 00011BA4 89D8                <1>         mov     eax, ebx		; restore eax
   575 00011BA6 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; clear out data size request
   576 00011BAB 89CA                <1>         mov     edx, ecx		; restore dx
   577 00011BAD 59                  <1> 	pop	ecx
   578 00011BAE 5B                  <1> 	pop	ebx
   579 00011BAF C3                  <1> 	retn
   580                              <1> 
   581                              <1> pciRegWrite8:
   582 00011BB0 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 8 bit write size
   583 00011BB5 EBAD                <1>         jmp	short pciRegWrite	; call generic PCI access
   584                              <1> 
   585                              <1> pciRegWrite16:
   586 00011BB7 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 16 bit write size
   587 00011BBC 0D00000040          <1>         or      eax, PCI16		; call generic PCI access
   588 00011BC1 EBA1                <1>         jmp	short pciRegWrite
   589                              <1> 
   590                              <1> pciRegWrite32:
   591 00011BC3 25FFFFFF3F          <1>         and     eax, NOT_PCI32_PCI16	; set up 32 bit write size
   592 00011BC8 0D00000080          <1>         or      eax, PCI32		; call generic PCI access
   593 00011BCD EB95                <1>         jmp	pciRegWrite
   594                              <1> 
   595                              <1> init_codec:
   596                              <1> 	; 05/06/2017
   597                              <1> 	; 28/05/2017 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   598                              <1> 	;
   599 00011BCF A1[486B0100]        <1> 	mov	eax, [audio_dev_id]	
   600 00011BD4 B041                <1> 	mov	al, VIA_ACLINK_CTRL
   601 00011BD6 E86AFFFFFF          <1> 	call	pciRegRead8
   602                              <1> 	; ?
   603 00011BDB B040                <1> 	mov	al, VIA_ACLINK_STAT
   604 00011BDD E863FFFFFF          <1> 	call	pciRegRead8
   605 00011BE2 F6C201              <1> 	test	dl, VIA_ACLINK_C00_READY
   606 00011BE5 7508                <1>         jnz     short _codec_ready_1
   607 00011BE7 E80E000000          <1> 	call	reset_codec
   608 00011BEC 7306                <1> 	jnc	short _codec_ready_2 ; eax = 1
   609 00011BEE C3                  <1> 	retn
   610                              <1> _codec_ready_1:
   611 00011BEF B801000000          <1> 	mov	eax, 1
   612                              <1> _codec_ready_2:
   613 00011BF4 E886000000          <1> 	call	codec_io_w16
   614                              <1> detect_codec:
   615 00011BF9 C3                  <1> 	retn
   616                              <1> 
   617                              <1> reset_codec:
   618                              <1> 	; 16/04/2017
   619                              <1> 	; 23/03/2017 
   620                              <1> 	; ('codec.asm')
   621                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   622 00011BFA A1[486B0100]        <1> 	mov	eax, [audio_dev_id]
   623 00011BFF B041                <1>  	mov	al, VIA_ACLINK_CTRL
   624 00011C01 B2E0                <1>        	mov	dl, VIA_ACLINK_CTRL_ENABLE + VIA_ACLINK_CTRL_RESET + VIA_ACLINK_CTRL_SYNC
   625 00011C03 E8A8FFFFFF          <1> 	call	pciRegWrite8
   626                              <1> 
   627 00011C08 E849000000          <1> 	call	delay_100ms 	; wait 100 ms
   628                              <1> _rc_cold:
   629 00011C0D E814000000          <1>         call    cold_reset
   630 00011C12 7301                <1>         jnc     short _reset_codec_ok
   631                              <1> 	
   632                              <1> 	; 16/04/2017
   633                              <1>         ;xor     eax, eax         ; timeout error
   634                              <1>        	;stc
   635 00011C14 C3                  <1> 	retn
   636                              <1> 
   637                              <1> _reset_codec_ok:
   638                              <1> 	; 01/09/2020
   639                              <1> 	; 15/08/2020
   640                              <1> 	; 27/07/2020
   641                              <1> 	; also reset codec by using index control register 0 of AD1980 or ALC655
   642                              <1> 	; (to fix line out -2 channels audio playing- problem on AD1980 codec)  
   643                              <1> 
   644 00011C15 29C0                <1> 	sub	eax, eax
   645 00011C17 BA00000000          <1> 	mov	edx, CODEC_RESET_REG ; 00h ; Reset register
   646 00011C1C E8CA000000          <1> 	call	codec_write
   647                              <1> 
   648                              <1> 	;sub	eax, eax
   649                              <1> 	; 01/09/2020
   650                              <1> 	; 15/08/2020
   651                              <1> 	; AD1980 BugFix
   652                              <1> 	; (set HPSEL -headphone amp to be driven from mixer- and
   653                              <1> 	;      CLDIS - center and LFE disable- bits)	
   654                              <1> 	;mov	eax, 0C00h ; HPSEL = bit 10, CLDIS = bit 11 ; 01/09/2020
   655                              <1>  	;mov	edx, CODEC_MISC_CRTL_BITS_REG ; 76h ; Misc Ctrl Bits ; AD1980
   656                              <1> 	;call	codec_write
   657                              <1> 
   658 00011C21 31C0                <1>         xor     eax, eax
   659                              <1>         ;mov	al, VIA_ACLINK_C00_READY ; 1
   660 00011C23 FEC0                <1>         inc	al
   661 00011C25 C3                  <1> 	retn
   662                              <1> 
   663                              <1> cold_reset:
   664                              <1> 	; 16/04/2017
   665                              <1> 	; 23/03/2017
   666                              <1> 	; ('codec.asm')
   667                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   668                              <1> 	;mov	eax, [audio_dev_id]
   669                              <1> 	;mov	al, VIA_ACLINK_CTRL
   670 00011C26 30D2                <1> 	xor	dl, dl ; 0
   671 00011C28 E883FFFFFF          <1> 	call	pciRegWrite8
   672                              <1> 
   673 00011C2D E824000000          <1> 	call	delay_100ms 	; wait 100 ms
   674                              <1> 
   675                              <1> 	;; ACLink on, deassert ACLink reset, VSR, SGD data out
   676                              <1>         ;; note - FM data out has trouble with non VRA codecs !!
   677                              <1>         
   678                              <1> 	;mov	eax, [audio_dev_id]
   679                              <1> 	;mov	al, VIA_ACLINK_CTRL
   680 00011C32 B2CC                <1> 	mov	dl, VIA_ACLINK_CTRL_INIT
   681 00011C34 E877FFFFFF          <1> 	call	pciRegWrite8
   682                              <1> 
   683 00011C39 B910000000          <1> 	mov	ecx, 16	; total 2s
   684                              <1> 
   685                              <1> _crst_wait:
   686                              <1> 	;mov	eax, [audio_dev_id]
   687 00011C3E B040                <1> 	mov	al, VIA_ACLINK_STAT
   688 00011C40 E800FFFFFF          <1> 	call	pciRegRead8	
   689                              <1> 
   690 00011C45 F6C201              <1>         test    dl, VIA_ACLINK_C00_READY
   691 00011C48 750B                <1>         jnz     short _crst_ok
   692                              <1> 
   693 00011C4A 51                  <1> 	push	ecx
   694 00011C4B E806000000          <1> 	call	delay_100ms
   695 00011C50 59                  <1> 	pop	ecx
   696                              <1> 
   697 00011C51 49                  <1>         dec     ecx
   698 00011C52 75EA                <1>         jnz     short _crst_wait
   699                              <1> 
   700                              <1> _crst_fail:
   701 00011C54 F9                  <1>         stc
   702                              <1> _crst_ok:
   703 00011C55 C3                  <1> 	retn
   704                              <1> 
   705                              <1> delay_100ms:
   706                              <1> 	; 29/05/2017
   707                              <1> 	; 24/03/2017 ('codec.asm')
   708                              <1> 	; wait 100 ms
   709 00011C56 B990010000          <1> 	mov	ecx, 400  ; 400*0.25ms
   710                              <1> _delay_x_ms:
   711 00011C5B E803000000          <1> 	call	delay1_4ms
   712 00011C60 E2F9                <1>         loop	_delay_x_ms
   713 00011C62 C3                  <1> 	retn
   714                              <1> 
   715                              <1> ;       delay1_4ms - Delay for 1/4 millisecond.
   716                              <1> ;	    1mS = 1000us
   717                              <1> ;       Entry:
   718                              <1> ;         None
   719                              <1> ;       Exit:
   720                              <1> ;	  None
   721                              <1> ;
   722                              <1> ;       Modified:
   723                              <1> ;         None
   724                              <1> ;
   725                              <1> 
   726                              <1> 	; 29/05/2017
   727                              <1> 	; 23/04/2017
   728                              <1> 	; 05/03/2017 (TRDOS 386)
   729                              <1> 	; ('UTILS.ASM')
   730                              <1> delay1_4ms:
   731 00011C63 50                  <1>         push    eax 
   732 00011C64 51                  <1>         push    ecx
   733 00011C65 B110                <1>         mov	cl, 16		; close enough.
   734                              <1> 
   735 00011C67 E461                <1> 	in	al, PORTB ; 61h
   736                              <1> 		
   737 00011C69 2410                <1> 	and	al, REFRESH_STATUS ; 10h
   738 00011C6B 88C5                <1> 	mov	ch, al		; Start toggle state
   739                              <1> _d4ms1:	
   740 00011C6D E461                <1> 	in	al, PORTB	; Read system control port
   741                              <1> 	
   742 00011C6F 2410                <1> 	and	al, REFRESH_STATUS ; Refresh toggles 15.085 microseconds
   743 00011C71 38C5                <1> 	cmp	ch, al
   744 00011C73 74F8                <1> 	je	short _d4ms1	; Wait for state change
   745                              <1> 
   746 00011C75 88C5                <1> 	mov	ch, al		; Update with new state
   747 00011C77 FEC9                <1> 	dec	cl
   748 00011C79 75F2                <1> 	jnz	short _d4ms1
   749                              <1> 
   750 00011C7B F8                  <1> 	clc	; 29/05/2017
   751                              <1> 
   752 00011C7C 59                  <1>         pop     ecx
   753 00011C7D 58                  <1>         pop     eax
   754 00011C7E C3                  <1>         retn
   755                              <1> 
   756                              <1> ; 10/04/2017 (TRDOS 386)
   757                              <1> ; 12/11/2016
   758                              <1> 
   759                              <1> codec_io_w16: ;w32
   760                              <1> 	; ('codec.asm')
   761 00011C7F 668B15[466B0100]    <1>         mov	dx, [audio_io_base]
   762 00011C86 6681C28000          <1>         add     dx, VIA_REG_AC97
   763 00011C8B EF                  <1> 	out	dx, eax
   764 00011C8C C3                  <1>         retn
   765                              <1> 
   766                              <1> codec_io_r16: ;r32
   767                              <1> 	; ('codec.asm')
   768 00011C8D 668B15[466B0100]    <1>         mov     dx, [audio_io_base]
   769 00011C94 6681C28000          <1>         add     dx, VIA_REG_AC97
   770 00011C99 ED                  <1>         in	eax, dx
   771 00011C9A C3                  <1>         retn
   772                              <1> 
   773                              <1> ctrl_io_w8:
   774                              <1> 	; ('codec.asm')
   775 00011C9B 660315[466B0100]    <1>         add     dx, [audio_io_base]
   776 00011CA2 EE                  <1>         out	dx, al
   777 00011CA3 C3                  <1>         retn
   778                              <1> 
   779                              <1> ctrl_io_r8:
   780                              <1> 	; ('codec.asm')
   781 00011CA4 660315[466B0100]    <1>         add     dx, [audio_io_base]
   782 00011CAB EC                  <1>         in	al, dx
   783 00011CAC C3                  <1>         retn
   784                              <1> 
   785                              <1> ctrl_io_w32:
   786                              <1> 	; ('codec.asm')
   787 00011CAD 660315[466B0100]    <1>         add     dx, [audio_io_base]
   788 00011CB4 EF                  <1>         out	dx, eax
   789 00011CB5 C3                  <1>         retn
   790                              <1> 
   791                              <1> ctrl_io_r32:
   792                              <1> 	; ('codec.asm')
   793 00011CB6 660315[466B0100]    <1>         add	dx, [audio_io_base]
   794 00011CBD ED                  <1> 	in	eax, dx
   795 00011CBE C3                  <1>         retn
   796                              <1> 
   797                              <1> codec_read:
   798                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   799                              <1>         ; Use only primary codec.
   800                              <1>         ; eax = register
   801 00011CBF C1E010              <1>         shl     eax, VIA_REG_AC97_CMD_SHIFT
   802 00011CC2 0D00008002          <1>         or      eax, VIA_REG_AC97_PRIMARY_VALID + VIA_REG_AC97_READ
   803                              <1> 
   804 00011CC7 E8B3FFFFFF          <1> 	call    codec_io_w16
   805                              <1> 
   806                              <1>       	; codec_valid
   807 00011CCC E831000000          <1> 	call	codec_check_ready
   808 00011CD1 7301                <1>         jnc	short _cr_ok
   809                              <1> 
   810 00011CD3 C3                  <1> 	retn
   811                              <1> 
   812                              <1> _cr_ok:
   813                              <1> 	; wait 25 ms
   814 00011CD4 B950000000          <1> 	mov	ecx, 80 ; (100*0.25 ms)
   815                              <1> _cr_wloop:
   816 00011CD9 E885FFFFFF          <1> 	call	delay1_4ms
   817 00011CDE E2F9                <1> 	loop	_cr_wloop
   818                              <1> 
   819 00011CE0 E8A8FFFFFF          <1>         call    codec_io_r16
   820 00011CE5 25FFFF0000          <1>         and     eax, 0FFFFh
   821 00011CEA C3                  <1>         retn
   822                              <1> 
   823                              <1> codec_write:
   824                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   825                              <1>         ; Use only primary codec.
   826                              <1>         
   827                              <1> 	; eax = data (volume)
   828                              <1> 	; edx = register (mixer register)
   829                              <1> 	
   830 00011CEB C1E210              <1> 	shl     edx, VIA_REG_AC97_CMD_SHIFT
   831                              <1> 
   832 00011CEE C1E000              <1>         shl     eax, VIA_REG_AC97_DATA_SHIFT ; shl eax, 0
   833 00011CF1 09C2                <1>         or      edx, eax
   834                              <1> 
   835 00011CF3 B800000000          <1>         mov     eax, VIA_REG_AC97_CODEC_ID_PRIMARY
   836 00011CF8 C1E01E              <1>         shl     eax, VIA_REG_AC97_CODEC_ID_SHIFT
   837 00011CFB 09D0                <1>         or      eax, edx
   838                              <1> 
   839 00011CFD E87DFFFFFF          <1>         call    codec_io_w16
   840                              <1>         ;mov    [codec.regs+esi], ax
   841                              <1> 
   842                              <1>         ;call	codec_check_ready
   843                              <1>        	;retn
   844                              <1> 	;jmp	short _codec_check_ready	
   845                              <1> 
   846                              <1> codec_check_ready:
   847                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
   848                              <1> 
   849                              <1> _codec_check_ready:
   850 00011D02 B914000000          <1> 	mov	ecx, 20	; total 2s
   851                              <1> _ccr_wait:
   852 00011D07 51                  <1> 	push	ecx
   853                              <1> 
   854 00011D08 E880FFFFFF          <1>         call    codec_io_r16
   855 00011D0D A900000001          <1>         test    eax, VIA_REG_AC97_BUSY
   856 00011D12 740B                <1>         jz      short _ccr_ok
   857                              <1> 
   858 00011D14 E83DFFFFFF          <1> 	call	delay_100ms
   859                              <1> 
   860 00011D19 59                  <1> 	pop	ecx
   861                              <1> 
   862 00011D1A 49                  <1> 	dec     ecx
   863 00011D1B 75EA                <1>         jnz     short _ccr_wait
   864                              <1> 
   865 00011D1D F9                  <1>         stc
   866 00011D1E C3                  <1>         retn
   867                              <1> 
   868                              <1> _ccr_ok:
   869 00011D1F 59                  <1> 	pop	ecx
   870 00011D20 25FFFF0000          <1> 	and     eax, 0FFFFh
   871 00011D25 C3                  <1>         retn
   872                              <1> 
   873                              <1> codec_config:
   874                              <1> 	; 10/06/2017
   875                              <1> 	; 29/05/2017
   876                              <1> 	; 24/04/2017
   877                              <1> 	; 21/04/2017
   878                              <1> 	; 16/04/2017 (TRDOS 386 Kernel) 
   879                              <1> 	; 15/11/2016 ('codec.asm', 'player.com')
   880                              <1> 	; 14/11/2016
   881                              <1> 	; 12/11/2016 - Erdogan Tan
   882                              <1> 	;	     (Ref: KolibriOS, 'setup_codec', codec.inc)
   883                              <1> 
   884 00011D26 B802020000          <1> 	mov     eax, 0202h
   885 00011D2B 66A3[766B0100]      <1> 	mov	[audio_master_volume], ax
   886 00011D31 66B81F1F            <1> 	mov	ax, 1F1Fh ; 31,31
   887 00011D35 BA02000000          <1> 	mov	edx, CODEC_MASTER_VOL_REG ; 02h ; Line Out
   888 00011D3A E8ACFFFFFF          <1> 	call	codec_write
   889                              <1> 	;jc	short cconfig_error
   890                              <1> 
   891                              <1>  	;mov    eax, 0202h
   892 00011D3F 66B80202            <1> 	mov     ax, 0202h
   893 00011D43 BA18000000          <1> 	mov	edx, CODEC_PCM_OUT_REG ; 18h ; Wave Output (Stereo)
   894 00011D48 E89EFFFFFF          <1> 	call	codec_write
   895                              <1> 	;jc	short cconfig_error
   896                              <1>       
   897                              <1>  	;mov    eax, 0202h
   898 00011D4D 66B80202            <1> 	mov	ax, 0202h
   899 00011D51 BA04000000          <1> 	mov	edx, CODEC_AUX_VOL ; 04h ; CODEC_HP_VOL_REG ; HeadPhone
   900 00011D56 E890FFFFFF          <1> 	call	codec_write
   901                              <1> 	;jc	short cconfig_error
   902                              <1> 
   903                              <1>  	;mov    eax, 08h
   904                              <1>         ;mov    ax,  08h
   905 00011D5B 66B80880            <1> 	mov	ax, 8008h ; Mute
   906 00011D5F BA0C000000          <1> 	mov	edx, 0Ch  ; AC97_PHONE_VOL ; TAD Input (Mono)
   907 00011D64 E882FFFFFF          <1> 	call	codec_write
   908                              <1> 	;jc	short cconfig_error
   909                              <1> 
   910                              <1>  	;mov    eax, 0808h
   911 00011D69 66B80808            <1>         mov     ax,  0808h
   912 00011D6D BA10000000          <1>         mov	edx, CODEC_LINE_IN_VOL_REG ; 10h ; Line Input (Stereo)	
   913 00011D72 E874FFFFFF          <1> 	call	codec_write
   914                              <1> 	;jc	short cconfig_error
   915                              <1> 
   916                              <1>  	;mov    eax, 0808h
   917 00011D77 66B80808            <1> 	mov     ax,  0808h
   918 00011D7B BA12000000          <1>         mov	edx, CODEC_CD_VOL_REG ; 12h ; CR Input (Stereo)
   919 00011D80 E866FFFFFF          <1> 	call	codec_write
   920                              <1> 	;jc	short cconfig_error
   921                              <1> 
   922                              <1>  	;mov    eax, 0808h
   923 00011D85 66B80808            <1> 	mov     ax,  0808h
   924 00011D89 BA16000000          <1>         mov	edx, CODEC_AUX_VOL_REG ; 16h ; Aux Input (Stereo)
   925                              <1> 	;call	codec_write
   926                              <1> 	;;jc	short cconfig_error
   927 00011D8E E958FFFFFF          <1> 	jmp	codec_write ; 10/06/2017
   928                              <1> 
   929                              <1> ;	; Extended Audio Status (2Ah)
   930                              <1> ;	mov	eax, CODEC_EXT_AUDIO_CTRL_REG ; 2Ah 
   931                              <1> ;	call	codec_read
   932                              <1> ;	and     eax, 0FFFFh - 2		; clear DRA (BIT1)
   933                              <1> ;	;or     eax, 1			; set VRA (BIT0)
   934                              <1> ;	or	eax, 5  	; VRA (BIT0) & S/PDIF (BIT2) ; 14/11/2016
   935                              <1> ;	mov	edx, CODEC_EXT_AUDIO_CTRL_REG
   936                              <1> ;	call	codec_write
   937                              <1> ;	;jc	short cconfig_error
   938                              <1> ;
   939                              <1> ;set_sample_rate:
   940                              <1> ;	;movzx	eax, word [audio_freq]
   941                              <1> ;	mov	ax, [audio_freq]
   942                              <1> ;	mov	edx, CODEC_PCM_FRONT_DACRATE_REG ; 2Ch ; PCM Front DAC Rate
   943                              <1> ;	;call	codec_write
   944                              <1> ;	;retn
   945                              <1> ;	jmp	codec_write
   946                              <1> 	
   947                              <1> ;cconfig_error:
   948                              <1> ;	retn
   949                              <1> 
   950                              <1> vt8233_int_handler:
   951                              <1> 	; 27/07/2020
   952                              <1> 	; 22/07/2020
   953                              <1> 	; Interrupt Handler for VIA VT8237R Audio Controller
   954                              <1> 	; Note: called by 'dev_IRQ_service'
   955                              <1> 	; 14/10/2017 
   956                              <1> 	; 09/10/2017, 10/10/2017, 12/10/2017
   957                              <1> 	; 13/06/2017
   958                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
   959                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('player.asm') 
   960                              <1> 
   961                              <1> 	;push	eax ; * must be saved !
   962                              <1> 	;push	edx
   963                              <1> 	;push	ecx
   964                              <1> 	;push	ebx ; * must be saved !
   965                              <1> 	;push	esi
   966                              <1> 	;push	edi
   967                              <1> 
   968                              <1> 	;cmp	byte [audio_busy], 1
   969                              <1> 	;jnb	short _ih0 ; 09/10/2017
   970                              <1> 
   971                              <1> 	;mov	byte [audio_flag_eol], 0
   972                              <1> 
   973 00011D93 66BA0000            <1>         mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STATUS
   974 00011D97 E808FFFFFF          <1>         call    ctrl_io_r8
   975                              <1> 
   976 00011D9C A880                <1> 	test    al, VIA_REG_STAT_ACTIVE
   977 00011D9E 7417                <1>         jz      short _ih0 ; 09/10/2017
   978                              <1> 
   979 00011DA0 2407                <1>         and     al, VIA_REG_STAT_EOL + VIA_REG_STAT_FLAG + VIA_REG_STAT_STOPPED
   980 00011DA2 A2[756B0100]        <1> 	mov	[audio_flag_eol], al
   981 00011DA7 740E                <1>         jz	short _ih0 ; 09/10/2017
   982                              <1> 
   983                              <1> 	; 09/10/2017
   984                              <1> 	;mov	byte [audio_busy], 1
   985                              <1> 
   986 00011DA9 803D[746B0100]01    <1> 	cmp	byte [audio_play_cmd], 1
   987 00011DB0 7315                <1> 	jnb	short _ih1 ; 10/10/2017
   988                              <1> 
   989 00011DB2 E84A000000          <1> 	call	channel_reset
   990                              <1> _ih0:
   991                              <1> 	; 09/10/2017
   992 00011DB7 A0[756B0100]        <1>         mov     al, [audio_flag_eol]   ;; ack ;;
   993 00011DBC 66BA0000            <1>         mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STATUS
   994 00011DC0 E8D6FEFFFF          <1>         call    ctrl_io_w8
   995 00011DC5 EB39                <1> 	jmp	short _ih4
   996                              <1> _ih1:
   997                              <1> vt8233_tuneLoop:
   998 00011DC7 A0[756B0100]        <1>         mov     al, [audio_flag_eol]   ;; ack ;;
   999 00011DCC 66BA0000            <1>         mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STATUS
  1000 00011DD0 E8C6FEFFFF          <1>         call    ctrl_io_w8
  1001                              <1> 
  1002                              <1> 	; 22/07/2020
  1003                              <1> 	;; 12/10/2017
  1004                              <1> 	;mov	byte [audio_flag], 0 ; Reset	
  1005                              <1> 
  1006                              <1> 	; 10/10/2017
  1007                              <1> 	; 09/10/2017
  1008                              <1> 	;test	byte [audio_flag_eol], VIA_REG_STAT_FLAG
  1009                              <1> 	;jz	short _ih2 ; EOL
  1010                              <1> 
  1011                              <1> 	; 22/07/2020
  1012                              <1> 	; 14/10/2017
  1013                              <1> 	;test	byte [audio_flag_eol], VIA_REG_STAT_EOL
  1014                              <1> 	;jnz	short _ih2 ; EOL
  1015                              <1> 	;		   ; (Half Buffer 2 has been completed 
  1016                              <1> 	;		   ; and Half Buffer 1 will be played.)
  1017                              <1> 	
  1018                              <1> 	; FLAG  
  1019                              <1> 	; (Half Buffer 1 has been completed 
  1020                              <1> 	;  and Half Buffer 2 will be played.)
  1021                              <1> 
  1022                              <1> 	; 14/10/2017
  1023                              <1> 	;; (Continue to play.)
  1024                              <1> 	;mov	al, VIA_REG_CTRL_INT
  1025                              <1>        	;or	al, VIA_REG_CTRL_START
  1026                              <1>        	;mov	dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
  1027                              <1>         ;call	ctrl_io_w8
  1028                              <1> 	; 12/10/2017
  1029                              <1> 	;mov	byte [audio_flag], 1 
  1030                              <1> 
  1031                              <1> 	; 22/07/2020
  1032                              <1> 	;inc	byte [audio_flag] ; = 1
  1033                              <1> _ih2: 
  1034                              <1> 	; 10/10/2017
  1035 00011DD5 8B3D[606B0100]      <1> 	mov	edi, [audio_dma_buff]
  1036 00011DDB 8B0D[646B0100]      <1> 	mov	ecx, [audio_dmabuff_size]
  1037 00011DE1 D1E9                <1> 	shr	ecx, 1 ; dma buff size / 2 = half buffer size
  1038                              <1> 	
  1039                              <1> 	; 22/07/2020
  1040                              <1> 	; 12/10/2017
  1041                              <1> 	;cmp	byte [audio_flag], 0
  1042                              <1> 	;ja	short _ih3 ; Playing Half Buffer 2 (Current: FLAG)
  1043                              <1> 	
  1044                              <1> 	; 27/07/2020
  1045                              <1> 	; 22/07/2020
  1046 00011DE3 F605[686B0100]01    <1> 	test	byte [audio_flag], 1  ; Current flag value
  1047 00011DEA 7402                <1> 	jz	short _ih3 ; Half Buffer 1 must be filled
  1048                              <1> 
  1049                              <1> 	; Half Buffer 2 must be filled
  1050 00011DEC 01CF                <1> 	add	edi, ecx
  1051                              <1> _ih3:
  1052                              <1> 	; Update half buffer 2 while playing half buffer 1
  1053                              <1> 	; Update half buffer 1 while playing half buffer 2
  1054                              <1> 
  1055 00011DEE 8B35[586B0100]      <1> 	mov	esi, [audio_p_buffer] ; phy addr of audio buff
  1056 00011DF4 C1E902              <1> 	shr	ecx, 2 ; half buff size / 4
  1057 00011DF7 F3A5                <1> 	rep	movsd
  1058                              <1> 
  1059                              <1> 	; switch flag value ;
  1060 00011DF9 8035[686B0100]01    <1> 	xor	byte [audio_flag], 1
  1061                              <1> 	; 12/10/2017
  1062                              <1> 	; [audio_flag] = 0 : Playing dma half buffer 2
  1063                              <1> 			   ; Next buffer (to update) is dma half buff 1
  1064                              <1> 	; 	       = 1 : Playing dma half buffer 1
  1065                              <1> 			   ; Next buffer (to update) is dma half buff 2
  1066                              <1> _ih4:	
  1067                              <1> 	; 28/05/2017
  1068                              <1> 	;mov	byte [audio_busy], 0 ; 09/10/2017
  1069                              <1> 	;
  1070                              <1> 	;pop	edi
  1071                              <1> 	;pop	esi
  1072                              <1> 	;pop	ebx ; * must be restored !
  1073                              <1> 	;pop	ecx
  1074                              <1> 	;pop	edx
  1075                              <1> 	;pop	eax ; * must be restored !
  1076                              <1> 
  1077 00011E00 C3                  <1> 	retn
  1078                              <1> 
  1079                              <1> channel_reset:
  1080                              <1> 	; 24/06/2017
  1081                              <1> 	; 29/05/2017
  1082                              <1> 	; 23/03/2017
  1083                              <1> 	; 14/11/2016 - Erdogan Tan
  1084                              <1> 	; 12/11/2016 - Erdogan Tan (Ref: KolibriOS, vt823x.asm)
  1085 00011E01 BA01000000          <1>         mov	edx, VIA_REG_OFFSET_CONTROL
  1086                              <1>         ;mov	eax, VIA_REG_CTRL_PAUSE + VIA_REG_CTRL_TERMINATE + VIA_REG_CTRL_RESET
  1087 00011E06 B848000000          <1>         mov	eax, VIA_REG_CTRL_PAUSE + VIA_REG_CTRL_TERMINATE ; 24/06/2017       
  1088 00011E0B E88BFEFFFF          <1> 	call    ctrl_io_w8
  1089                              <1> 
  1090                              <1>         ;mov	edx, VIA_REG_OFFSET_CONTROL
  1091                              <1>         ;call   ctrl_io_r8
  1092                              <1> 
  1093                              <1> 	; wait for 50 ms
  1094 00011E10 B9A0000000          <1> 	mov	ecx, 160 ; (200*0.25 ms) ; 29/05/2017	
  1095                              <1> _ch_rst_wait:
  1096 00011E15 E849FEFFFF          <1> 	call	delay1_4ms
  1097 00011E1A 49                  <1> 	dec	ecx
  1098 00011E1B 75F8                <1> 	jnz	short _ch_rst_wait     
  1099                              <1> 
  1100                              <1>         ; disable interrupts
  1101 00011E1D BA01000000          <1>         mov	edx, VIA_REG_OFFSET_CONTROL
  1102 00011E22 31C0                <1>         xor     eax, eax
  1103 00011E24 E872FEFFFF          <1>         call    ctrl_io_w8
  1104                              <1> 
  1105                              <1>         ; clear interrupts
  1106 00011E29 BA00000000          <1>         mov	edx, VIA_REG_OFFSET_STATUS
  1107 00011E2E B803000000          <1> 	mov	eax, 3
  1108 00011E33 E863FEFFFF          <1>         call	ctrl_io_w8
  1109                              <1> 
  1110                              <1> 	;mov	edx, VIA_REG_OFFSET_CURR_PTR
  1111                              <1> 	;xor	eax, eax
  1112                              <1> 	;call	ctrl_io_w32
  1113                              <1> 
  1114 00011E38 C3                  <1>         retn	
  1115                              <1> 
  1116                              <1> vt8233_stop: ; 22/04/2017
  1117 00011E39 C605[746B0100]00    <1> 	mov	byte [audio_play_cmd], 0 ; stop !
  1118                              <1> _tlp2:
  1119                              <1> 	; 24/06/2017
  1120                              <1>         ; finished with song, stop everything
  1121                              <1> 	;mov	al, VIA_REG_CTRL_INT
  1122                              <1>         ;or	al, VIA_REG_CTRL_TERMINATE
  1123                              <1> 	;mov	dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
  1124                              <1>         ;call	ctrl_io_w8
  1125                              <1> 
  1126                              <1>         ;call	channel_reset
  1127                              <1> 	;retn
  1128                              <1> 
  1129 00011E40 EBBF                <1> 	jmp	short channel_reset
  1130                              <1> 
  1131                              <1> set_vt8233_bdl: ; Set VT8237R Buffer Descriptor List
  1132                              <1> 	; 22/07/2020 - TRDOS 386 v2.0.2
  1133                              <1> 	; 28/05/2017
  1134                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
  1135                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('via_wav.asm' - 29/11/2016) 
  1136                              <1> 	
  1137                              <1> 	; eax = dma buffer address = [audio_DMA_buff]
  1138                              <1> 	; ecx = dma buffer buffer size = [audio_dmabuff_size]
  1139                              <1> 
  1140 00011E42 D1E9                <1> 	shr	ecx, 1 ; dma half buffer size
  1141 00011E44 89CE                <1> 	mov	esi, ecx
  1142                              <1> 
  1143 00011E46 BF[7C6B0100]        <1>         mov     edi, audio_bdl_buff	; get BDL address
  1144 00011E4B B910000000          <1>         mov     ecx, 32 / 2		; make 32 entries in BDL
  1145                              <1> 
  1146 00011E50 EB05                <1> 	jmp	short s_vt8233_bdl1 
  1147                              <1> 
  1148                              <1> s_vt8233_bdl0:
  1149                              <1> 	; set buffer descriptor 0 to start of data file in memory
  1150                              <1> 
  1151 00011E52 A1[606B0100]        <1>  	mov	eax, [audio_dma_buff]	; Physical address of DMA buffer
  1152                              <1>  
  1153                              <1> s_vt8233_bdl1:
  1154 00011E57 AB                  <1> 	stosd				; store dmabuffer1 address
  1155                              <1> 
  1156 00011E58 89C2                <1> 	mov	edx, eax
  1157                              <1> 
  1158                              <1> ; VIA VT8235.PDF: (Page 110) (Erdogan Tan, 29/11/2016)
  1159                              <1> 	;
  1160                              <1> 	; 	Audio SGD Table Format
  1161                              <1> 	;	-------------------------------
  1162                              <1> 	;	63   62    61-56    55-32  31-0
  1163                              <1> 	;	--   --   --------  -----  ----
  1164                              <1> 	;	EOL FLAG -reserved- Base   Base
  1165                              <1> 	;		    	    Count  Address
  1166                              <1> 	;		            [23:0] [31:0]
  1167                              <1> 	;	EOL: End Of Link. 
  1168                              <1> 	;	     1 indicates this block is the last of the link.
  1169                              <1> 	;	     If the channel Interrupt on EOL bit is set, then
  1170                              <1> 	;	     an interrupt is generated at the end of the transfer.
  1171                              <1> 	;
  1172                              <1> 	;	FLAG: Block Flag. If set, transfer pauses at the end of this
  1173                              <1> 	;	      block. If the channel Interrupt on FLAG bit is set,
  1174                              <1> 	;	      then an interrupt is generated at the end of this block.
  1175                              <1> 
  1176 00011E5A 89F0                <1> 	mov	eax, esi ; DMA half buffer size
  1177 00011E5C 01C2                <1> 	add	edx, eax
  1178 00011E5E 0D00000040          <1> 	or	eax, FLAG
  1179                              <1> 	;or	eax, EOL
  1180 00011E63 AB                  <1> 	stosd
  1181                              <1> 
  1182                              <1> ; 2nd buffer:
  1183                              <1> 
  1184 00011E64 89D0                <1>         mov	eax, edx ; Physical address of the 2nd half of DMA buffer	
  1185 00011E66 AB                  <1> 	stosd		 ; store dmabuffer2 address
  1186                              <1> 
  1187                              <1> ; set length to [audio_dmabuff_size]/2
  1188                              <1> ; Set control (bits 31:16) to BUP, bits 15:0=number of samples
  1189                              <1> ; 
  1190 00011E67 89F0                <1> 	mov	eax, esi ; DMA half buffer size
  1191                              <1> 	; 22/07/2020
  1192                              <1> 	;or	eax, EOL
  1193 00011E69 0D00000040          <1> 	or	eax, FLAG
  1194 00011E6E AB                  <1> 	stosd
  1195                              <1> 
  1196 00011E6F E2E1                <1> 	loop    s_vt8233_bdl0
  1197                              <1> 
  1198                              <1> 	; 22/07/2020
  1199 00011E71 814FFC00000080      <1> 	or	dword [edi-4], EOL
  1200                              <1> 	
  1201 00011E78 C3                  <1> 	retn
  1202                              <1> 
  1203                              <1> vt8233_start_play:
  1204                              <1> 	; 01/09/2020 
  1205                              <1> 	; 22/07/2020 
  1206                              <1> 	; start to play audio data via VT8233 audio controller
  1207                              <1> 	; 13/06/2017
  1208                              <1> 	; 10/06/2017
  1209                              <1> 	; 24/04/2017 
  1210                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
  1211                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('via_wav.asm' - 29/11/2016) 
  1212                              <1> 	; write buffer descriptor list address
  1213                              <1> 
  1214                              <1> 	; Extended Audio Status (2Ah)
  1215 00011E79 B82A000000          <1> 	mov	eax, CODEC_EXT_AUDIO_CTRL_REG ; 2Ah 
  1216 00011E7E E83CFEFFFF          <1> 	call	codec_read
  1217 00011E83 25FDFF0000          <1> 	and     eax, 0FFFFh - 2		; clear DRA (BIT1)
  1218                              <1> 	;or     eax, 1			; set VRA (BIT0)
  1219                              <1> 	;or	eax, 5  	; VRA (BIT0) & S/PDIF (BIT2) ; 14/11/2016
  1220 00011E88 0C05                <1> 	or	al, 5
  1221                              <1> 	; 01/09/2020	
  1222                              <1> 	;or	eax, 3805h ; AD1980 (PRK, PRJ, PRI = 1 .. only front DAC)
  1223                              <1> 	; 01/09/2020
  1224                              <1> 	;mov	edx, CODEC_EXT_AUDIO_CTRL_REG
  1225                              <1> 	;cmp	word [audio_freq], 0BB80h ; 48 kHz
  1226                              <1> 	;jne	short set_extd_audio_status_1
  1227                              <1> 	;and	al, 0FEh ; disable VRA bit (set sample rate to 48000 Hz)
  1228                              <1> 	;jmp	short set_extd_audio_status_2
  1229                              <1> ;set_extd_audio_status_1:
  1230 00011E8A BA2A000000          <1> 	mov	edx, CODEC_EXT_AUDIO_CTRL_REG
  1231 00011E8F E857FEFFFF          <1> 	call	codec_write
  1232                              <1> 	;jc	short cconfig_error
  1233                              <1> 
  1234                              <1> set_sample_rate:
  1235                              <1> 	;movzx	eax, word [audio_freq]
  1236 00011E94 66A1[726B0100]      <1> 	mov	ax, [audio_freq]
  1237 00011E9A BA2C000000          <1> 	mov	edx, CODEC_PCM_FRONT_DACRATE_REG ; 2Ch ; PCM Front DAC Rate
  1238                              <1> ;set_extd_audio_status_2:
  1239 00011E9F E847FEFFFF          <1> 	call	codec_write
  1240                              <1> 
  1241                              <1> 	; 01/09/2020
  1242                              <1> 	; set AD1980 MCB register (Index 76h) to 0C00h
  1243                              <1> 	; (CLDIS, HPSEL)
  1244                              <1> 	;mov	ax, 0C00h
  1245                              <1> 	;mov	edx, CODEC_MISC_CRTL_BITS_REG ; 76h 
  1246                              <1> 	;			; Miscellaneous Control Bit Register
  1247                              <1> 	;call	codec_write
  1248                              <1> 	;
  1249                              <1> 
  1250 00011EA4 B8[7C6B0100]        <1>         mov	eax, audio_bdl_buff
  1251                              <1>   
  1252                              <1> 	; 12/11/2016 - Erdogan Tan 
  1253                              <1> 	; (Ref: KolibriOS, vt823x.asm, 'create_primary_buff')
  1254 00011EA9 BA04000000          <1> 	mov	edx, VIADEV_PLAYBACK + VIA_REG_OFFSET_TABLE_PTR
  1255 00011EAE E8FAFDFFFF          <1>         call	ctrl_io_w32
  1256                              <1> 
  1257                              <1> 	;call	codec_check_ready
  1258                              <1> 
  1259 00011EB3 66BA0200            <1>   	mov	dx, VIADEV_PLAYBACK + VIA_REG_OFS_PLAYBACK_VOLUME_L
  1260                              <1>         ;mov	eax, 2	; 31
  1261 00011EB7 B01F                <1> 	mov	al, 31
  1262 00011EB9 2A05[766B0100]      <1>         sub	al, [audio_master_volume_l]
  1263 00011EBF E8D7FDFFFF          <1> 	call	ctrl_io_w8
  1264                              <1> 
  1265                              <1> 	;call	codec_check_ready
  1266                              <1> 
  1267 00011EC4 66BA0300            <1>         mov     dx, VIADEV_PLAYBACK + VIA_REG_OFS_PLAYBACK_VOLUME_R
  1268                              <1>         ;mov	ax, 2	; 31
  1269 00011EC8 B01F                <1> 	mov	al, 31
  1270 00011ECA 2A05[776B0100]      <1>         sub	al, [audio_master_volume_r]
  1271 00011ED0 E8C6FDFFFF          <1> 	call    ctrl_io_w8
  1272                              <1> 
  1273                              <1> 	;call	codec_check_ready
  1274                              <1> ;
  1275                              <1> ;
  1276                              <1> ; All set. Let's play some music.
  1277                              <1> ;
  1278                              <1> ;
  1279                              <1>        	;mov    dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STOP_IDX
  1280                              <1>         ;mov    ax, VIA8233_REG_TYPE_16BIT or VIA8233_REG_TYPE_STEREO or 0xfffff or 0xff000000
  1281                              <1>         ;call   ctrl_io_w32
  1282                              <1> 
  1283                              <1> 	;call	codec_check_ready
  1284                              <1> 
  1285                              <1> 	; 08/12/2016
  1286                              <1> 	; 07/10/2016
  1287                              <1>         ;;mov    al, 1
  1288                              <1>         ;mov	al, 31
  1289                              <1> 	; 22/07/2020
  1290 00011ED5 B0FF                <1> 	mov	al, 0FFh
  1291 00011ED7 E813000000          <1> 	call    set_VT8233_LastValidIndex
  1292                              <1> 
  1293 00011EDC C605[746B0100]01    <1> 	mov	byte [audio_play_cmd], 1 ; play command (do not stop) !
  1294                              <1> 
  1295                              <1> 	; 22/07/2020
  1296                              <1> 	;mov	byte [audio_flag], 0  ; clear half buffer flag
  1297                              <1> 
  1298                              <1> vt8233_play: ; continue to play
  1299                              <1> 	; 22/04/2017
  1300                              <1> 	;mov	al, VIA_REG_CTRL_INT
  1301                              <1>        	;or	al, VIA_REG_CTRL_START
  1302                              <1>         ;;mov	al, VIA_REG_CTRL_AUTOSTART + VIA_REG_CTRL_START
  1303                              <1> 	; 22/07/2020	
  1304 00011EE3 B0A1                <1> 	mov	al, VIA_REG_CTRL_AUTOSTART + VIA_REG_CTRL_START + VIA_REG_CTRL_INT_FLAG
  1305                              <1> 
  1306 00011EE5 66BA0100            <1> 	mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
  1307 00011EE9 E8ADFDFFFF          <1>         call    ctrl_io_w8
  1308                              <1> 	;call	codec_check_ready
  1309                              <1> 	;retn
  1310                              <1> 	;jmp	codec_check_ready
  1311 00011EEE C3                  <1> 	retn
  1312                              <1> 
  1313                              <1> ;input AL = index # to stop on
  1314                              <1> set_VT8233_LastValidIndex:
  1315                              <1> 	; 23/07/2020
  1316                              <1> 	; 10/06/2017
  1317                              <1> 	; 21/04/2017 (TRDOS 386 kernel, 'audio.s')
  1318                              <1> 	; 24/03/2017 - 'PLAYER.COM' ('via_wav.asm' - 29/11/2016) 
  1319                              <1> 	; 19/11/2016
  1320                              <1> 	; 14/11/2016 - Erdogan Tan (Ref: VIA VT8235.PDF, Page 110)
  1321                              <1> 	; 12/11/2016 - Erdogan Tan
  1322                              <1> 	; (Ref: KolibriOS, vt823x.asm, 'create_primary_buff')
  1323                              <1> 	;push	edx
  1324                              <1> 	;push	ax
  1325 00011EEF 50                  <1> 	push	eax ; 23/07/2020
  1326                              <1> 	;push	ecx
  1327 00011EF0 0FB705[726B0100]    <1> 	movzx	eax, word [audio_freq] ; Hertz
  1328 00011EF7 BA00001000          <1> 	mov	edx, 100000h ; 2^20 = 1048576
  1329 00011EFC F7E2                <1> 	mul	edx
  1330 00011EFE B980BB0000          <1> 	mov	ecx, 48000	
  1331 00011F03 F7F1                <1> 	div	ecx
  1332                              <1> 	;and	eax, 0FFFFFh
  1333                              <1> 	;pop	ecx
  1334                              <1> 	;pop	dx 
  1335 00011F05 5A                  <1> 	pop	edx ; 23/07/2020
  1336 00011F06 C1E218              <1> 	shl	edx, 24  ; STOP Index Setting: Bit 24 to 31
  1337 00011F09 09D0                <1> 	or	eax, edx
  1338                              <1> 	; 19/11/2016
  1339 00011F0B 803D[706B0100]10    <1> 	cmp	byte [audio_bps], 16
  1340 00011F12 7505                <1> 	jne	short sLVI_1
  1341 00011F14 0D00002000          <1> 	or	eax, VIA8233_REG_TYPE_16BIT
  1342                              <1> sLVI_1:
  1343 00011F19 803D[716B0100]02    <1> 	cmp	byte [audio_stmo], 2
  1344 00011F20 7505                <1> 	jne	short sLVI_2
  1345 00011F22 0D00001000          <1> 	or	eax, VIA8233_REG_TYPE_STEREO
  1346                              <1> sLVI_2:
  1347 00011F27 BA08000000          <1> 	mov     edx, VIADEV_PLAYBACK + VIA_REG_OFFSET_STOP_IDX
  1348 00011F2C E87CFDFFFF          <1>         call    ctrl_io_w32
  1349                              <1> 	;call	codec_check_ready
  1350                              <1> 	;pop	edx
  1351 00011F31 C3                  <1> 	retn
  1352                              <1> 
  1353                              <1> vt8233_pause: ; pause
  1354                              <1> 	; 10/06/2017
  1355                              <1> 	; 22/04/2017
  1356                              <1> 	;mov     al, VIA_REG_CTRL_INT
  1357                              <1>         ;or      al, VIA_REG_CTRL_PAUSE
  1358                              <1> 	; 23/07/2020
  1359 00011F32 B029                <1> 	mov	al, VIA_REG_CTRL_PAUSE+VIA_REG_CTRL_INT_FLAG+VIA_REG_CTRL_AUTOSTART
  1360                              <1> 	
  1361 00011F34 66BA0100            <1> 	mov     dx, VIADEV_PLAYBACK + VIA_REG_OFFSET_CONTROL
  1362 00011F38 E85EFDFFFF          <1>         call    ctrl_io_w8
  1363                              <1> 	;call	codec_check_ready
  1364                              <1> 	;retn
  1365                              <1> 	;jmp	codec_check_ready
  1366 00011F3D C3                  <1> 	retn
  1367                              <1> 
  1368                              <1> vt8233_reset: 
  1369                              <1> 	; 22/04/2017
  1370                              <1> 	; reset VT8237R (vt8233) Audio Controller
  1371                              <1> 	;cmp	byte [audio_play_cmd], 1
  1372                              <1> 	;jna	short vt8233_rst_0
  1373 00011F3E C605[746B0100]00    <1> 	mov	byte [audio_play_cmd], 0 ; stop !
  1374                              <1> vt8233_rst_0:
  1375 00011F45 E8B0FCFFFF          <1> 	call	reset_codec
  1376 00011F4A 720A                <1> 	jc	short vt8233_rst_1 ; codec error !
  1377                              <1> 	; eax = 1
  1378 00011F4C E82EFDFFFF          <1> 	call	codec_io_w16 ; w32
  1379 00011F51 E8ABFEFFFF          <1> 	call	channel_reset
  1380                              <1> vt8233_rst_1:
  1381 00011F56 C3                  <1> 	retn
  1382                              <1> 
  1383                              <1> vt8233_volume:
  1384                              <1> 	; set VT8237R (vt8233) sound volume level
  1385                              <1> 	; 24/04/2017
  1386                              <1> 	; 22/04/2017
  1387                              <1> 	; bl = component (0 = master/playback/lineout volume)
  1388                              <1> 	; cl = left channel volume level (0 to 31)
  1389                              <1> 	; ch = right channel volume level (0 to 31)
  1390                              <1> 
  1391 00011F57 08DB                <1> 	or	bl, bl
  1392 00011F59 7520                <1> 	jnz	short vt8233_vol_1 ; temporary !
  1393 00011F5B 66B81F1F            <1> 	mov	ax, 1F1Fh ; 31,31
  1394 00011F5F 38C1                <1> 	cmp	cl, al
  1395 00011F61 7718                <1> 	ja	short vt8233_vol_1 ; temporary !
  1396 00011F63 38E5                <1> 	cmp	ch, ah
  1397 00011F65 7714                <1> 	ja	short vt8233_vol_1 ; temporary !
  1398 00011F67 66890D[766B0100]    <1> 	mov	[audio_master_volume], cx
  1399 00011F6E 6629C8              <1> 	sub	ax, cx
  1400 00011F71 BA02000000          <1> 	mov	edx, CODEC_MASTER_VOL_REG ; 02h ; Line Out
  1401 00011F76 E870FDFFFF          <1> 	call	codec_write
  1402                              <1> vt8233_vol_1:
  1403 00011F7B C3                  <1> 	retn
  1404                              <1> 
  1405                              <1> ; CODE for SOUND BLASTER 16
  1406                              <1> 
  1407                              <1> DetectSB:
  1408                              <1> 	; 24/04/2017
  1409                              <1> 	;pushad
  1410                              <1> ScanPort:
  1411 00011F7C 66BB1002            <1> 	mov     bx, 210h	; start scanning ports
  1412                              <1> 				; 210h, 220h, .. 260h
  1413                              <1> ResetDSP:       
  1414 00011F80 6689DA              <1> 	mov     dx, bx		; try to reset the DSP.
  1415 00011F83 6683C206            <1> 	add     dx, 06h
  1416 00011F87 B001                <1> 	mov	al, 1
  1417 00011F89 EE                  <1> 	out	dx, al
  1418                              <1> 
  1419 00011F8A EC                  <1> 	in	al, dx
  1420 00011F8B EC                  <1> 	in	al, dx
  1421 00011F8C EC                  <1> 	in	al, dx
  1422 00011F8D EC                  <1> 	in	al, dx
  1423                              <1> 
  1424 00011F8E 30C0                <1> 	xor     al, al
  1425 00011F90 EE                  <1> 	out	dx, al
  1426                              <1> 
  1427 00011F91 6683C208            <1> 	add     dx, 08h
  1428 00011F95 66B96400            <1> 	mov	cx, 100
  1429                              <1> WaitID:
  1430 00011F99 EC                  <1> 	in	al, dx
  1431 00011F9A 08C0                <1> 	or      al, al
  1432 00011F9C 7804                <1> 	js      short GetID
  1433 00011F9E E2F9                <1> 	loop    WaitID
  1434 00011FA0 EB0F                <1> 	jmp     short NextPort
  1435                              <1> GetID:          
  1436 00011FA2 6683EA04            <1> 	sub     dx, 04h
  1437 00011FA6 EC                  <1> 	in	al, dx
  1438 00011FA7 3CAA                <1> 	cmp     al, 0AAh
  1439 00011FA9 7413                <1> 	je      short Found
  1440 00011FAB 6683C204            <1> 	add     dx, 04h
  1441 00011FAF E2E8                <1> 	loop    WaitID
  1442                              <1> NextPort:
  1443 00011FB1 6683C310            <1> 	add     bx, 10h		; if not response,
  1444 00011FB5 6681FB6002          <1> 	cmp     bx, 260h	; try the next port.
  1445 00011FBA 76C4                <1> 	jbe     short ResetDSP
  1446 00011FBC F9                  <1> 	stc
  1447 00011FBD C3                  <1> 	retn
  1448                              <1> Found:
  1449 00011FBE 66891D[466B0100]    <1> 	mov     [audio_io_base], bx	; SB Port Address Found!
  1450                              <1> ScanIRQ:
  1451                              <1> SetIrqs:
  1452 00011FC5 28C0                <1> 	sub 	al, al ; 0
  1453 00011FC7 A2[3E6B0100]        <1> 	mov 	[IRQnum], al ; reset
  1454 00011FCC A2[436B0100]        <1> 	mov	[audio_intr], al ; reset
  1455                              <1> 
  1456                              <1> 	; ah > 0 -> set IRQ vector
  1457                              <1> 	; al = IRQ number
  1458                              <1> 	;mov	ax, 103h ; IRQ 3
  1459                              <1> 	;call	set_hardware_int_vector
  1460                              <1> 	;mov	ax, 104h ; IRQ 4
  1461                              <1> 	;call	set_hardware_int_vector
  1462 00011FD1 66B80501            <1> 	mov	ax, 105h ; IRQ 5
  1463 00011FD5 E8EEDDFFFF          <1> 	call	set_hardware_int_vector
  1464 00011FDA 66B80701            <1> 	mov	ax, 107h ; IRQ 7
  1465 00011FDE E8E5DDFFFF          <1> 	call	set_hardware_int_vector
  1466                              <1> 
  1467 00011FE3 668B15[466B0100]    <1> 	mov     dx, [audio_io_base] ; tells to the SB to
  1468 00011FEA 6683C20C            <1> 	add     dx, 0Ch		    ; generate a IRQ!
  1469                              <1> WaitSb:
  1470 00011FEE EC                  <1> 	in	al, dx
  1471 00011FEF 08C0                <1> 	or      al, al
  1472 00011FF1 78FB                <1> 	js      short WaitSb
  1473 00011FF3 B0F2                <1> 	mov     al, 0F2h
  1474 00011FF5 EE                  <1> 	out	dx, al
  1475                              <1> 
  1476 00011FF6 31C9                <1> 	xor     ecx, ecx	; wait until IRQ level
  1477                              <1> WaitIRQ: 
  1478 00011FF8 A0[3E6B0100]        <1> 	mov	al, [IRQnum]
  1479 00011FFD 3C00                <1> 	cmp     al, 0 ; is changed or timeout.
  1480 00011FFF 7706                <1> 	ja	short IrqOk
  1481 00012001 6649                <1> 	dec	cx
  1482 00012003 75F3                <1> 	jnz	short WaitIRQ
  1483 00012005 EB15                <1> 	jmp	short RestoreIrqs
  1484                              <1> IrqOk:
  1485 00012007 A2[436B0100]        <1> 	mov	[audio_intr], al ; set   
  1486 0001200C 668B15[466B0100]    <1> 	mov     dx, [audio_io_base]
  1487 00012013 6683C20E            <1> 	add     dx, 0Eh
  1488 00012017 EC                  <1> 	in	al, dx	; SB acknowledge.
  1489 00012018 B020                <1> 	mov	al, 20h
  1490 0001201A E620                <1> 	out	20h, al	; Hardware acknowledge.
  1491                              <1> 
  1492                              <1> RestoreIrqs:
  1493                              <1> 	; ah = 0 -> reset IRQ vector
  1494                              <1> 	; al = IRQ number
  1495                              <1> 	;mov	ax, 3 ; IRQ 3
  1496                              <1> 	;call	set_hardware_int_vector
  1497                              <1> 	;mov	ax, 4 ; IRQ 4
  1498                              <1> 	;call	set_hardware_int_vector
  1499 0001201C 66B80500            <1> 	mov	ax, 5 ; IRQ 5
  1500 00012020 E8A3DDFFFF          <1> 	call	set_hardware_int_vector
  1501 00012025 66B80700            <1> 	mov	ax, 7 ; IRQ 7
  1502 00012029 E89ADDFFFF          <1> 	call	set_hardware_int_vector
  1503                              <1> 
  1504 0001202E 31D2                <1> 	xor	edx, edx
  1505 00012030 8915[486B0100]      <1> 	mov	[audio_dev_id], edx ; 0
  1506 00012036 8915[4C6B0100]      <1> 	mov	[audio_vendor], edx ; 0
  1507 0001203C 8915[506B0100]      <1> 	mov	[audio_stats_cmd], edx ; 0
  1508                              <1> 
  1509                              <1> 	;popad
  1510                              <1> 
  1511 00012042 803D[436B0100]01    <1> 	cmp     byte [audio_intr], 1 ; IRQ level was changed?
  1512                              <1> 	
  1513 00012049 C3                  <1> 	retn
  1514                              <1> 
  1515                              <1> %macro	SbOut	1
  1516                              <1> %%Wait:
  1517                              <1> 	in	al, dx
  1518                              <1> 	or	al, al
  1519                              <1> 	js	short %%Wait
  1520                              <1> 	mov	al, %1
  1521                              <1> 	out	dx, al
  1522                              <1> %endmacro
  1523                              <1> 
  1524                              <1> SbInit_play:
  1525                              <1> 	; 22/10/2017
  1526                              <1> 	; 20/10/2017
  1527                              <1> 	; 06/10/2017
  1528                              <1> 	; 13/07/2017, 09/08/2017
  1529                              <1> 	; 24/04/2017, 15/05/2017, 24/06/2017
  1530                              <1> 	;pushad
  1531                              <1> SetBuffer:
  1532                              <1> 	;mov	byte [DmaFlag], 0
  1533                              <1> 
  1534 0001204A 8B1D[606B0100]      <1> 	mov	ebx, [audio_dma_buff] ; physical addr of DMA buff
  1535 00012050 89DF                <1> 	mov	edi, ebx
  1536 00012052 8B0D[646B0100]      <1> 	mov     ecx, [audio_dmabuff_size]
  1537                              <1> 
  1538 00012058 803D[706B0100]10    <1> 	cmp	byte [audio_bps], 16
  1539 0001205F 7531                <1> 	jne	short sbInit_0 ; set 8 bit DMA buffer
  1540                              <1> 	
  1541                              <1> 	; 09/08/2017
  1542                              <1> 	; convert byte count to word count
  1543 00012061 D1E9                <1> 	shr	ecx, 1
  1544 00012063 49                  <1> 	dec	ecx ; word count - 1
  1545                              <1> 	; convert byte offset to word offset
  1546 00012064 D1EB                <1> 	shr	ebx, 1
  1547                              <1> 
  1548                              <1> 	; 16 bit DMA buffer setting (DMA channel 5)
  1549 00012066 B005                <1> 	mov     al, 05h  ; set mask bit for channel 5  (4+1)
  1550 00012068 E6D4                <1> 	out	0D4h, al
  1551                              <1> 	
  1552 0001206A 30C0                <1> 	xor     al, al   ; stops all DMA processes on selected channel
  1553 0001206C E6D8                <1> 	out	0D8h, al ; clear selected channel register
  1554                              <1> 
  1555 0001206E 88D8                <1> 	mov     al, bl	 ; byte 0 of DMA buffer offset in words (physical) 
  1556 00012070 E6C4                <1> 	out	0C4h, al ; DMA channel 5 port number
  1557                              <1> 
  1558 00012072 88F8                <1> 	mov     al, bh   ; byte 1 of DMA buffer offset in words (physical)   
  1559 00012074 E6C4                <1> 	out	0C4h, al
  1560                              <1> 	
  1561                              <1> 	; 09/08/2017
  1562 00012076 C1EB0F              <1> 	shr	ebx, 15	 ; complete 16 bit shift
  1563 00012079 80E3FE              <1> 	and	bl, 0FEh ; clear bit 0 (not necessary, it will be ignored)
  1564                              <1> 
  1565 0001207C 88D8                <1> 	mov     al, bl   ; byte 2 of DMA buffer address (physical) 
  1566 0001207E E68B                <1> 	out	8Bh, al  ; page register port addr for channel 5 ; 13/07/2017
  1567                              <1> 
  1568 00012080 88C8                <1> 	mov     al, cl   ; low byte of DMA count - 1
  1569 00012082 E6C6                <1> 	out	0C6h, al ; count register port addr for channel 1
  1570                              <1> 
  1571 00012084 88E8                <1> 	mov     al, ch   ; high byte of DMA count - 1
  1572 00012086 E6C6                <1> 	out	0C6h, al
  1573                              <1> 
  1574                              <1> 	; channel 5, read, autoinitialized, single mode
  1575                              <1> 	;mov	al, 49h
  1576 00012088 B059                <1> 	mov	al, 59h  ; 06/10/2017 
  1577 0001208A E6D6                <1> 	out	0D6h, al ; DMA mode register port address
  1578                              <1> 
  1579 0001208C B001                <1> 	mov     al, 01h  ; clear mask bit for channel 1
  1580 0001208E E6D4                <1> 	out	0D4h, al ; DMA mask register port address
  1581                              <1> 
  1582 00012090 EB28                <1> 	jmp	short ClearBuffer
  1583                              <1> 
  1584                              <1> sbInit_0:    
  1585 00012092 49                  <1> 	dec     ecx ; 09/08/2017
  1586                              <1> 
  1587                              <1> 	; 8 bit DMA buffer setting (DMA channel 1)
  1588 00012093 B005                <1> 	mov     al, 05h ; set mask bit for channel 1  (4+1)
  1589 00012095 E60A                <1> 	out	0Ah, al ; DMA mask register
  1590                              <1> 
  1591 00012097 30C0                <1> 	xor     al, al  ; stops all DMA processes on selected channel
  1592 00012099 E60C                <1> 	out	0Ch, al ; clear selected channel register
  1593                              <1> 
  1594 0001209B 88D8                <1> 	mov     al, bl	; byte 0 of DMA buffer address (physical)   
  1595 0001209D E602                <1> 	out	02h, al ; DMA channel 1 port number
  1596                              <1> 
  1597 0001209F 88F8                <1> 	mov     al, bh  ; byte 1 of DMA buffer address (physical)   
  1598 000120A1 E602                <1> 	out	02h, al
  1599                              <1> 
  1600 000120A3 C1EB10              <1> 	shr	ebx, 16
  1601                              <1> 
  1602 000120A6 88D8                <1> 	mov     al, bl  ; byte 2 of DMA buffer address (physical)   
  1603 000120A8 E683                <1> 	out	83h, al ; page register port addr for channel 1
  1604                              <1> 
  1605 000120AA 88C8                <1> 	mov     al, cl  ; low byte of DMA count - 1
  1606 000120AC E603                <1> 	out	03h, al ; count register port addr for channel 1
  1607                              <1> 
  1608 000120AE 88E8                <1> 	mov     al, ch  ; high byte of DMA count - 1
  1609 000120B0 E603                <1> 	out	03h, al
  1610                              <1> 
  1611                              <1> 	; channel 1, read, autoinitialized, single mode
  1612                              <1> 	;mov	al, 49h
  1613 000120B2 B059                <1> 	mov	al, 59h ; 06/10/2017 
  1614 000120B4 E60B                <1> 	out	0Bh, al ; DMA mode register port address
  1615                              <1> 
  1616 000120B6 B001                <1> 	mov     al, 01h ; clear mask bit for channel 1
  1617 000120B8 E60A                <1> 	out	0Ah, al ; DMA mask register port address
  1618                              <1> 
  1619                              <1> ClearBuffer:
  1620                              <1> 	;;mov	edi, [audio_dma_buff]
  1621                              <1> 	;;mov	ecx, [audio_dmabuff_size]
  1622                              <1> 	;inc	ecx
  1623                              <1> 	;mov     al, 80h
  1624                              <1> 	;;cld
  1625                              <1> 	;rep     stosb
  1626                              <1> SetIrq:
  1627                              <1> 	;mov	ebx, SbIrqhandler
  1628                              <1> 	;mov	al, [audio_intr] ; IRQ number	
  1629                              <1> 	;call	set_dev_IRQ_service
  1630                              <1> 	;; SETUP (audio) INTERRUPT CALLBACK SERVICE
  1631                              <1> 	;mov	bl, [audio_intr] ; IRQ number
  1632                              <1> 	;mov	bh, [audio_cb_mode]
  1633                              <1> 	;inc	bh  ; 1 = Signal Response Byte method (fixed value)
  1634                              <1> 	;	    ; 2 = Callback service method
  1635                              <1> 	;	    ; 3 = Auto Increment S.R.B. method 	
  1636                              <1> 	;mov	cl, [audio_srb]
  1637                              <1> 	;mov	edx, [audio_cb_addr]
  1638                              <1> 	;mov	al, [audio_user]
  1639                              <1>  	;call	set_irq_callback_service
  1640                              <1> ResetDsp:
  1641 000120BA 668B15[466B0100]    <1> 	mov     dx, [audio_io_base]
  1642 000120C1 6683C206            <1> 	add     dx, 06h
  1643 000120C5 B001                <1> 	mov     al, 1
  1644 000120C7 EE                  <1> 	out	dx, al
  1645                              <1> 
  1646 000120C8 EC                  <1> 	in	al, dx
  1647 000120C9 EC                  <1> 	in	al, dx
  1648 000120CA EC                  <1> 	in	al, dx
  1649 000120CB EC                  <1> 	in	al, dx
  1650                              <1> 
  1651 000120CC 30C0                <1> 	xor     al, al
  1652 000120CE EE                  <1> 	out	dx, al
  1653                              <1> 
  1654 000120CF 66B96400            <1> 	mov     cx, 100
  1655 000120D3 28E4                <1> 	sub	ah, ah ; 0
  1656                              <1> WaitId:         
  1657 000120D5 668B15[466B0100]    <1> 	mov     dx, [audio_io_base]
  1658 000120DC 6683C20E            <1> 	add     dx, 0Eh
  1659 000120E0 EC                  <1> 	in	al, dx
  1660 000120E1 08C0                <1> 	or      al, al
  1661 000120E3 7807                <1> 	js      short sb_GetId
  1662 000120E5 E2EE                <1> 	loop    WaitId
  1663 000120E7 E9B4000000          <1> 	jmp     sb_Exit
  1664                              <1> sb_GetId:
  1665 000120EC 668B15[466B0100]    <1> 	mov     dx, [audio_io_base]
  1666 000120F3 6683C20A            <1> 	add     dx, 0Ah
  1667 000120F7 EC                  <1> 	in	al, dx
  1668 000120F8 3CAA                <1> 	cmp     al, 0AAh
  1669 000120FA 7407                <1> 	je      short SbOk
  1670 000120FC E2D7                <1> 	loop    WaitId
  1671 000120FE E99D000000          <1> 	jmp	sb_Exit
  1672                              <1> SbOk:
  1673 00012103 668B15[466B0100]    <1> 	mov     dx, [audio_io_base]
  1674 0001210A 6683C20C            <1> 	add     dx, 0Ch
  1675                              <1> 	SbOut   0D1h ; Turn on speaker
  1675                              <2> %%Wait:
  1675 0001210E EC                  <2>  in al, dx
  1675 0001210F 08C0                <2>  or al, al
  1675 00012111 78FB                <2>  js short %%Wait
  1675 00012113 B0D1                <2>  mov al, %1
  1675 00012115 EE                  <2>  out dx, al
  1676                              <1> 	SbOut   41h ; 8 bit or 16 bit transfer
  1676                              <2> %%Wait:
  1676 00012116 EC                  <2>  in al, dx
  1676 00012117 08C0                <2>  or al, al
  1676 00012119 78FB                <2>  js short %%Wait
  1676 0001211B B041                <2>  mov al, %1
  1676 0001211D EE                  <2>  out dx, al
  1677 0001211E 668B1D[726B0100]    <1> 	mov	bx, [audio_freq] ; sampling rate (Hz)
  1678                              <1> 	SbOut	bh ; sampling rate high byte
  1678                              <2> %%Wait:
  1678 00012125 EC                  <2>  in al, dx
  1678 00012126 08C0                <2>  or al, al
  1678 00012128 78FB                <2>  js short %%Wait
  1678 0001212A 88F8                <2>  mov al, %1
  1678 0001212C EE                  <2>  out dx, al
  1679                              <1> 	SbOut	bl ; sampling rate low byte
  1679                              <2> %%Wait:
  1679 0001212D EC                  <2>  in al, dx
  1679 0001212E 08C0                <2>  or al, al
  1679 00012130 78FB                <2>  js short %%Wait
  1679 00012132 88D8                <2>  mov al, %1
  1679 00012134 EE                  <2>  out dx, al
  1680                              <1> 
  1681                              <1> 	; 22/05/2017
  1682 00012135 E8C0000000          <1> 	call	sb16_volume_initial ; 15/05/2017
  1683                              <1> 	; 20/05/2017
  1684                              <1> 	;call	sb16_volume
  1685                              <1> 
  1686                              <1> StartDma:  
  1687                              <1> 	; autoinitialized mode
  1688 0001213A 803D[706B0100]10    <1> 	cmp	byte [audio_bps], 16 ; 16 bit samples
  1689 00012141 7411                <1> 	je	short sb_play_1
  1690                              <1> 	; 8 bit samples
  1691 00012143 66BBC600            <1> 	mov	bx, 0C6h ; 8 bit output (0C6h)
  1692 00012147 803D[716B0100]02    <1> 	cmp	byte [audio_stmo], 2 ; 1 = mono, 2 = stereo
  1693 0001214E 7214                <1> 	jb	short sb_play_2
  1694 00012150 B720                <1> 	mov	bh, 20h	; 8 bit stereo (20h)
  1695 00012152 EB10                <1> 	jmp	short sb_play_2
  1696                              <1> sb_play_1:
  1697                              <1> 	; 16 bit samples
  1698 00012154 66BBB610            <1> 	mov	bx, 10B6h ; 16 bit output (0B6h)
  1699 00012158 803D[716B0100]02    <1> 	cmp	byte [audio_stmo], 2 ; 1 = mono, 2 = stereo
  1700 0001215F 7203                <1> 	jb	short sb_play_2
  1701 00012161 80C720              <1> 	add	bh, 20h	; 16 bit stereo (30h)
  1702                              <1> sb_play_2:     
  1703                              <1> 	; PCM output (8/16 bit mono autoinitialized transfer)
  1704                              <1> 	SbOut   bl ; bCommand
  1704                              <2> %%Wait:
  1704 00012164 EC                  <2>  in al, dx
  1704 00012165 08C0                <2>  or al, al
  1704 00012167 78FB                <2>  js short %%Wait
  1704 00012169 88D8                <2>  mov al, %1
  1704 0001216B EE                  <2>  out dx, al
  1705                              <1> 	SbOut	bh ; bMode
  1705                              <2> %%Wait:
  1705 0001216C EC                  <2>  in al, dx
  1705 0001216D 08C0                <2>  or al, al
  1705 0001216F 78FB                <2>  js short %%Wait
  1705 00012171 88F8                <2>  mov al, %1
  1705 00012173 EE                  <2>  out dx, al
  1706 00012174 8B1D[646B0100]      <1> 	mov	ebx, [audio_dmabuff_size]  ; 15/05/2017
  1707 0001217A D1EB                <1> 	shr	ebx, 1 ; half buffer size
  1708                              <1> 	; 20/10/2017	
  1709 0001217C 803D[706B0100]10    <1> 	cmp	byte [audio_bps], 16 ; 16 bit DMA
  1710 00012183 7502                <1> 	jne	short sb_play_3
  1711 00012185 D1EB                <1> 	shr	ebx, 1 ; byte count to word count
  1712                              <1> sb_play_3: 
  1713 00012187 664B                <1> 	dec	bx  ; wBlkSize is one less than the actual size 
  1714                              <1> 	SbOut   bl
  1714                              <2> %%Wait:
  1714 00012189 EC                  <2>  in al, dx
  1714 0001218A 08C0                <2>  or al, al
  1714 0001218C 78FB                <2>  js short %%Wait
  1714 0001218E 88D8                <2>  mov al, %1
  1714 00012190 EE                  <2>  out dx, al
  1715                              <1> 	SbOut   bh
  1715                              <2> %%Wait:
  1715 00012191 EC                  <2>  in al, dx
  1715 00012192 08C0                <2>  or al, al
  1715 00012194 78FB                <2>  js short %%Wait
  1715 00012196 88F8                <2>  mov al, %1
  1715 00012198 EE                  <2>  out dx, al
  1716                              <1> 
  1717 00012199 C605[746B0100]01    <1> 	mov	byte [audio_play_cmd], 1 ; playing !
  1718                              <1> 
  1719                              <1> 	;; Set Voice and master volumes
  1720                              <1> 	;mov	dx, [audio_io_base]
  1721                              <1> 	;add	dl, 4 ; Mixer chip Register Address Port
  1722                              <1> 	;SbOut	30h   ; select Master Volume Register (L)
  1723                              <1> 	;inc	dl    ; Mixer chip Register Data Port
  1724                              <1> 	;SbOut	0F8h  ; Max. volume value is 31 (31*8)
  1725                              <1> 	;dec	dl
  1726                              <1> 	;SbOut	31h   ; select Master Volume Register (R)
  1727                              <1> 	;inc	dl
  1728                              <1> 	;SbOut	0F8h  ; Max. volume value is 31 (31*8)
  1729                              <1> 	;dec	dl
  1730                              <1> 	;SbOut	32h   ; select Voice Volume Register (L)
  1731                              <1> 	;inc	dl
  1732                              <1> 	;SbOut	0F8h  ; Max. volume value is 31 (31*8)
  1733                              <1> 	;dec	dl
  1734                              <1> 	;SbOut	33h   ; select Voice Volume Register (R)
  1735                              <1> 	;inc	dl
  1736                              <1> 	;SbOut	0F8h  ; Max. volume value is 31 (31*8)	
  1737                              <1> 	;;
  1738                              <1> 	;dec	dl
  1739                              <1> 	;SbOut	44h   ; select Treble Register (L)
  1740                              <1> 	;inc	dl
  1741                              <1> 	;SbOut	0F0h  ; Max. Treble value is 15 (15*16)
  1742                              <1> 	;dec	dl
  1743                              <1> 	;SbOut	45h   ; select Treble Register (R)
  1744                              <1> 	;inc	dl
  1745                              <1> 	;SbOut	0F0h  ; Max. Treble value is 15 (15*16)
  1746                              <1> 	;dec	dl
  1747                              <1> 	;SbOut	46h   ; select Bass Register (L)
  1748                              <1> 	;inc	dl
  1749                              <1> 	;SbOut	0F0h  ; Max. Bass value is 15 (15*16)
  1750                              <1> 	;dec	dl
  1751                              <1> 	;SbOut	47h   ; select Bass Register (R)
  1752                              <1> 	;inc	dl
  1753                              <1> 	;SbOut	0F0h  ; Max. Bass value is 15 (15*16)	
  1754                              <1> 
  1755                              <1> sb_Exit:           
  1756                              <1> 	;popad
  1757 000121A0 C3                  <1> 	retn
  1758                              <1> 
  1759                              <1> sb16_int_handler:
  1760                              <1> 	; Interrupt Handler for Sound Blaster 16 Audio Card
  1761                              <1> 	; Note: called by 'dev_IRQ_service'
  1762                              <1> 	; 20/10/2017
  1763                              <1> 	; 12/10/2017
  1764                              <1> 	; 10/10/2017 
  1765                              <1> 	; 12/05/2017, 09/10/2017
  1766                              <1> 	; 24/04/2017 (TRDOS 386 kernel, 'audio.s')
  1767                              <1> 	; 10/03/2017 - 'PLAYWAV.PRG' ('playwav.s') 
  1768                              <1> 
  1769                              <1> 	;push	eax ; * must be saved !
  1770                              <1> 	;push	ebx ; * must be saved !
  1771                              <1> 	;push	ecx
  1772                              <1> 	;push	edx
  1773                              <1> 	;push	esi
  1774                              <1> 	;push	edi
  1775                              <1> 
  1776 000121A1 668B15[466B0100]    <1> 	mov     dx, [audio_io_base]
  1777                              <1> 	; 20/10/2017
  1778 000121A8 80C20F              <1> 	add     dl, 0Fh ; 2xFh (DSP 16 bit intr ack)
  1779 000121AB 803D[706B0100]10    <1> 	cmp	byte [audio_bps], 16
  1780 000121B2 7402                <1> 	je	short sb_irq_16bit_ack
  1781                              <1> sb_irq_8bit_ack:
  1782 000121B4 FECA                <1> 	dec	dl  ; 2xEh (DSP 8 bit intr ack)
  1783                              <1> sb_irq_16bit_ack:
  1784 000121B6 EC                  <1> 	in	al, dx
  1785                              <1> 
  1786                              <1> 	;cmp	byte [audio_busy], 0
  1787                              <1> 	;ja	short sb_irq_h3
  1788                              <1> 
  1789                              <1> 	;mov	byte [audio_busy], 1
  1790                              <1> 
  1791 000121B7 803D[746B0100]01    <1> 	cmp	byte [audio_play_cmd], 1
  1792 000121BE 7307                <1> 	jnb	short sb_irq_h1
  1793                              <1> sb_irq_h0:
  1794 000121C0 E8A9000000          <1> 	call	sb16_stop
  1795 000121C5 EB2B                <1> 	jmp	short sb_irq_h3
  1796                              <1> sb_irq_h1:
  1797                              <1> 	;call	sb16_tuneloop
  1798                              <1> 	; 09/10/2017
  1799                              <1> sb16_tuneloop:
  1800 000121C7 8B3D[606B0100]      <1> 	mov	edi, [audio_dma_buff]
  1801 000121CD 8B0D[646B0100]      <1> 	mov	ecx, [audio_dmabuff_size]
  1802 000121D3 D1E9                <1> 	shr	ecx, 1 ; dma buff size / 2 = half buffer size
  1803                              <1> 
  1804                              <1> 	; 22/05/2017
  1805 000121D5 F605[686B0100]01    <1> 	test	byte [audio_flag], 1  ; Current flag value
  1806 000121DC 7402                <1> 	jz	short sb_tlp1 ; EOL (Half Buffer 1 must be filled)
  1807                              <1> 	; FLAG (Half Buffer 2 must be filled)
  1808 000121DE 01CF                <1> 	add	edi, ecx
  1809                              <1> 	; 15/05/2017
  1810                              <1> sb_tlp1: 
  1811 000121E0 8B35[586B0100]      <1> 	mov	esi, [audio_p_buffer] ; phy addr of audio buff
  1812                              <1> 	;rep	movsb
  1813 000121E6 C1E902              <1> 	shr	ecx, 2 ; half buff size / 4
  1814 000121E9 F3A5                <1> 	rep	movsd 
  1815                              <1> 	;retn
  1816                              <1> 
  1817                              <1> 	; 10/10/2017
  1818                              <1> 	; switch flag value
  1819 000121EB 8035[686B0100]01    <1> 	xor	byte [audio_flag], 1
  1820                              <1> 
  1821                              <1> 	; 12/10/2017
  1822                              <1> 	; [audio_flag] = 0 : Playing dma half buffer 2 (odd intr count)
  1823                              <1> 			   ; Next buffer (to update) is dma half buff 1
  1824                              <1> 	; 	       = 1 : Playing dma half buffer 1 (even intr count)
  1825                              <1> 			   ; Next buffer (to update) is dma half buff 2
  1826                              <1> 
  1827                              <1> sb_irq_h3:
  1828                              <1> 	;mov	byte [audio_busy], 0
  1829                              <1> 
  1830                              <1> 	;pop	edi
  1831                              <1> 	;pop	esi
  1832                              <1> 	;pop	edx
  1833                              <1> 	;pop	ecx
  1834                              <1> 	;pop	ebx ; * must be restored !
  1835                              <1> 	;pop	eax ; * must be restored !
  1836                              <1> 	
  1837 000121F2 C3                  <1> 	retn
  1838                              <1> 
  1839                              <1> sb16_volume:
  1840                              <1> 	; 22/10/2017
  1841                              <1> 	; mov [audio_master_volume_l], cl 
  1842                              <1> 	; mov [audio_master_volume_h], ch 
  1843 000121F3 66890D[766B0100]    <1> 	mov	[audio_master_volume], cx
  1844                              <1> sb16_volume_initial:
  1845 000121FA 6652                <1> 	push	dx ; DX (port address) must be saved
  1846 000121FC 668B15[466B0100]    <1> 	mov	dx, [audio_io_base]
  1847 00012203 6683C204            <1> 	add	dx, 4 ; Mixer chip address port
  1848 00012207 B022                <1> 	mov	al, 22h ; master volume
  1849 00012209 EE                  <1> 	out	dx, al
  1850 0001220A 6642                <1> 	inc	dx
  1851 0001220C 8A25[766B0100]      <1> 	mov	ah, [audio_master_volume_l]
  1852 00012212 C0EC02              <1> 	shr	ah, 2 ; 32 -> 8 level
  1853 00012215 C0E405              <1> 	shl	ah, 5 ; bit 5 to 7
  1854 00012218 A0[776B0100]        <1> 	mov	al, [audio_master_volume_r]	
  1855 0001221D C0E802              <1> 	shr	al, 2 ; 32 -> 8 level
  1856                              <1> 	;and	al, 0Fh
  1857 00012220 D0E0                <1> 	shl	al, 1 ; bit 1 to 3
  1858 00012222 08E0                <1> 	or	al, ah
  1859 00012224 EE                  <1> 	out	dx, al
  1860 00012225 665A                <1> 	pop	dx ; DX (port address) must be restored
  1861 00012227 C3                  <1> 	retn
  1862                              <1> 
  1863                              <1> sb16_pause:
  1864 00012228 668B15[466B0100]    <1> 	mov	dx, [audio_io_base]
  1865 0001222F 6683C20C            <1> 	add	dx, 0Ch ; Command & Data Port
  1866 00012233 803D[706B0100]10    <1> 	cmp	byte [audio_bps], 16 ; 16 bit samples
  1867 0001223A 7404                <1> 	je	short sb_pause_1
  1868                              <1> 	; 8 bit samples
  1869 0001223C B3D0                <1> 	mov	bl, 0D0h ; 8 bit DMA mode
  1870 0001223E EB02                <1> 	jmp	short sb_pause_2
  1871                              <1> sb_pause_1:
  1872                              <1> 	; 16 bit samples
  1873 00012240 B3D5                <1> 	mov	bl, 0D5h ; 16 bit DMA mode
  1874                              <1> sb_pause_2:     
  1875                              <1> 	SbOut   bl ; bCommand
  1875                              <2> %%Wait:
  1875 00012242 EC                  <2>  in al, dx
  1875 00012243 08C0                <2>  or al, al
  1875 00012245 78FB                <2>  js short %%Wait
  1875 00012247 88D8                <2>  mov al, %1
  1875 00012249 EE                  <2>  out dx, al
  1876                              <1> sb_pause_3:
  1877 0001224A C3                  <1> 	retn
  1878                              <1> 
  1879                              <1> sb16_continue:
  1880 0001224B 668B15[466B0100]    <1> 	mov	dx, [audio_io_base]
  1881 00012252 6683C20C            <1> 	add	dx, 0Ch ; Command & Data Port
  1882 00012256 803D[706B0100]10    <1> 	cmp	byte [audio_bps], 16 ; 16 bit samples
  1883 0001225D 7404                <1> 	je	short sb_cont_1
  1884                              <1> 	; 8 bit samples
  1885 0001225F B3D4                <1> 	mov	bl, 0D4h ; 8 bit DMA mode
  1886 00012261 EB02                <1> 	jmp	short sb_cont_2
  1887                              <1> sb_cont_1:
  1888                              <1> 	; 16 bit samples
  1889 00012263 B3D6                <1> 	mov	bl, 0D6h ; 16 bit DMA mode
  1890                              <1> sb_cont_2:     
  1891                              <1> 	SbOut   bl ; bCommand
  1891                              <2> %%Wait:
  1891 00012265 EC                  <2>  in al, dx
  1891 00012266 08C0                <2>  or al, al
  1891 00012268 78FB                <2>  js short %%Wait
  1891 0001226A 88D8                <2>  mov al, %1
  1891 0001226C EE                  <2>  out dx, al
  1892                              <1> sb_cont_3:
  1893 0001226D C3                  <1> 	retn
  1894                              <1> 
  1895                              <1> sb16_stop:
  1896                              <1> 	; 24/04/2017
  1897 0001226E 803D[746B0100]00    <1> 	cmp	byte [audio_play_cmd], 0
  1898 00012275 7648                <1> 	jna	short sb16_stop_4
  1899                              <1> 
  1900                              <1> 	; 22/05/2017
  1901 00012277 668B15[466B0100]    <1> 	mov	dx, [audio_io_base]
  1902 0001227E 6683C20C            <1> 	add	dx, 0Ch
  1903                              <1> 
  1904 00012282 B3D9                <1> 	mov	bl, 0D9h ; exit auto-initialize 16 bit transfer
  1905                              <1> 	; stop  autoinitialized DMA transfer mode 
  1906 00012284 803D[706B0100]10    <1> 	cmp	byte [audio_bps], 16 ; 16 bit samples
  1907 0001228B 7402                <1> 	je	short sb16_stop_1
  1908                              <1> 	;mov	bl, 0DAh ; exit auto-initialize 8 bit transfer
  1909 0001228D FEC3                <1> 	inc	bl
  1910                              <1> sb16_stop_1:
  1911                              <1> 	SbOut	bl ; exit auto-initialize transfer command
  1911                              <2> %%Wait:
  1911 0001228F EC                  <2>  in al, dx
  1911 00012290 08C0                <2>  or al, al
  1911 00012292 78FB                <2>  js short %%Wait
  1911 00012294 88D8                <2>  mov al, %1
  1911 00012296 EE                  <2>  out dx, al
  1912                              <1> 
  1913 00012297 30C0                <1> 	xor     al, al ; stops all DMA processes on selected channel
  1914                              <1> 
  1915 00012299 803D[706B0100]10    <1> 	cmp	byte [audio_bps], 16 ; 16 bit samples
  1916 000122A0 7404                <1> 	je	short sb16_stop_2
  1917 000122A2 E60C                <1> 	out	0Ch, al ; clear selected channel register
  1918 000122A4 EB02                <1> 	jmp	short sb16_stop_3
  1919                              <1> 
  1920                              <1> sb16_stop_2:
  1921 000122A6 E6D8                <1> 	out	0D8h, al ; clear selected channel register
  1922                              <1> 
  1923                              <1> sb16_stop_3:
  1924 000122A8 C605[746B0100]00    <1> 	mov	byte [audio_play_cmd], 0 ; stop !
  1925                              <1> SbDone:
  1926                              <1> 	;mov	dx, [audio_io_base]
  1927                              <1> 	;add	dx, 0Ch
  1928                              <1> 	SbOut   0D0h
  1928                              <2> %%Wait:
  1928 000122AF EC                  <2>  in al, dx
  1928 000122B0 08C0                <2>  or al, al
  1928 000122B2 78FB                <2>  js short %%Wait
  1928 000122B4 B0D0                <2>  mov al, %1
  1928 000122B6 EE                  <2>  out dx, al
  1929                              <1> 	SbOut   0D3h
  1929                              <2> %%Wait:
  1929 000122B7 EC                  <2>  in al, dx
  1929 000122B8 08C0                <2>  or al, al
  1929 000122BA 78FB                <2>  js short %%Wait
  1929 000122BC B0D3                <2>  mov al, %1
  1929 000122BE EE                  <2>  out dx, al
  1930                              <1> sb16_stop_4:
  1931 000122BF C3                  <1> 	retn
  1932                              <1> 
  1933                              <1> sb16_reset:
  1934                              <1> 	; 24/04/2017      
  1935 000122C0 668B15[466B0100]    <1> 	mov     dx, [audio_io_base] ; try to reset the DSP.
  1936 000122C7 6683C206            <1> 	add     dx, 06h
  1937 000122CB B001                <1> 	mov	al, 1
  1938 000122CD EE                  <1> 	out	dx, al
  1939                              <1> 
  1940 000122CE EC                  <1> 	in	al, dx
  1941 000122CF EC                  <1> 	in	al, dx
  1942 000122D0 EC                  <1> 	in	al, dx
  1943 000122D1 EC                  <1> 	in	al, dx
  1944                              <1> 
  1945 000122D2 30C0                <1> 	xor     al, al
  1946 000122D4 EE                  <1> 	out	dx, al
  1947                              <1> 
  1948 000122D5 6683C208            <1> 	add     dx, 08h
  1949 000122D9 66B96400            <1> 	mov	cx, 100
  1950                              <1> sbrstWaitID:
  1951 000122DD EC                  <1> 	in	al, dx
  1952 000122DE 08C0                <1> 	or      al, al
  1953 000122E0 7804                <1> 	js      short sbrstGetID
  1954 000122E2 E2F9                <1> 	loop    sbrstWaitID
  1955 000122E4 F9                  <1> 	stc
  1956 000122E5 C3                  <1> 	retn
  1957                              <1> sbrstGetID:          
  1958 000122E6 6683EA04            <1> 	sub     dx, 04h
  1959 000122EA EC                  <1> 	in	al, dx
  1960 000122EB 3CAA                <1> 	cmp     al, 0AAh
  1961 000122ED 7406                <1> 	je      short sb_rst_retn
  1962 000122EF 6683C204            <1> 	add     dx, 04h
  1963 000122F3 E2E8                <1> 	loop    sbrstWaitID
  1964                              <1> sb_rst_retn:
  1965 000122F5 C3                  <1> 	retn
  1966                              <1> 
  1967                              <1> ac97_codec_config:
  1968                              <1> 	; 10/06/2017
  1969                              <1> 	; 05/06/2017
  1970                              <1> 	; 29/05/2017
  1971                              <1> 	; 28/05/2017 (TRDOS 386, 'audio.s')
  1972                              <1> 	; 07/11/2016 (Erdogan Tan)
  1973                              <1> 	; Derived from 'codecConfig' procedure in 'CODEC.ASM'
  1974                              <1> 	; .wav player for DOS by Jeff Leyda (02/09/2002)
  1975                              <1> 
  1976                              <1> 	;; 'PLAYER.ASM'
  1977                              <1> 	;; get ICH base address regs for mixer and bus master
  1978                              <1> 
  1979                              <1> init_ac97_controller: ; 10/06/2017
  1980 000122F6 A1[486B0100]        <1> 	mov	eax, [audio_dev_id]
  1981                              <1>         ;mov	al, NAMBAR_REG
  1982                              <1>         ;;call  pciRegRead16			; read PCI registers 10-11
  1983                              <1>         ;call	pciRegRead32
  1984                              <1> 	;and	dx, IO_ADDR_MASK 		; mask off BIT0
  1985                              <1> 	;;and	edx, IO_ADDR_MASK 
  1986                              <1> 
  1987                              <1>         ;mov	[NAMBAR], dx			; save audio mixer base addr
  1988                              <1> 
  1989                              <1>         ;mov    al, NABMBAR_REG
  1990                              <1>         ;;call	pciRegRead16
  1991                              <1>         ;call	pciRegRead32
  1992                              <1> 	;and	dx, 0FFC0h ; IO_ADDR_MASK
  1993                              <1> 	;;and	edx, 0FFC0h
  1994                              <1> 
  1995                              <1>         ;mov    [NABMBAR], dx			; save bus master base addr
  1996                              <1> 
  1997                              <1> 	;mov	eax, [audio_dev_id]
  1998 000122FB B004                <1>         mov     al, PCI_CMD_REG
  1999                              <1>         ;call	pciRegRead8			; read PCI command register
  2000 000122FD E84AF8FFFF          <1>         call	pciRegRead16
  2001 00012302 80CA05              <1> 	or      dl, IO_ENA+BM_ENA               ; enable IO and bus master
  2002                              <1>         ;call 	pciRegWrite8
  2003 00012305 E8ADF8FFFF          <1> 	call	pciRegWrite16
  2004                              <1> 
  2005                              <1> 	; 'CODEC.ASM'
  2006                              <1> 
  2007                              <1> 	; enable codec, unmute stuff, set output rate
  2008                              <1> ;	; entry: [audio_freq] = desired sample rate
  2009                              <1> 		
  2010                              <1> ;	mov    	dx, [NAMBAR]               	
  2011                              <1> ;	add    	dx, CODEC_EXT_AUDIO_CTRL_REG  	; 2Ah  	  
  2012                              <1> ;	in     	ax, dx
  2013                              <1> ;	or	ax, 1
  2014                              <1> ;	out	dx, ax 				; Enable variable rate audio
  2015                              <1> 
  2016                              <1> ;       ;call    delay1_4ms
  2017                              <1> ;       ;call    delay1_4ms
  2018                              <1> ;       ;call    delay1_4ms
  2019                              <1> ;       ;call    delay1_4ms
  2020                              <1> 
  2021                              <1> ;	mov	ax, [audio_freq]		; sample rate
  2022                              <1> 
  2023                              <1> ;	mov    	dx, [NAMBAR]               	
  2024                              <1> ;	add    	dx, CODEC_PCM_FRONT_DACRATE_REG	; 2Ch  	  
  2025                              <1> ;	out	dx, ax 				; out sample rate
  2026                              <1> 		
  2027                              <1> ;       ;call	delay1_4ms
  2028                              <1> ;       ;call	delay1_4ms
  2029                              <1> ;       ;call	delay1_4ms
  2030                              <1> ;       ;call	delay1_4ms
  2031                              <1> 
  2032                              <1> 	;mov	dx, [NAMBAR]			; mixer base address
  2033                              <1>         ;add	dx, CODEC_RESET_REG  		; reset register
  2034                              <1>         ;mov	ax, 42
  2035                              <1> 	;out	dx, ax                          ; reset
  2036                              <1> 
  2037                              <1> 	;mov    dx, [NABMBAR]			; bus master base address
  2038                              <1>         ;add	dx, GLOB_STS_REG
  2039                              <1>         ;mov	ax, 2
  2040                              <1> 	;out	dx, ax                         
  2041                              <1> 
  2042 0001230A E847F9FFFF          <1>         call    delay_100ms ; 29/05/2017
  2043                              <1> 
  2044                              <1> init_ac97_codec:
  2045                              <1> 	; 10/06/2017
  2046                              <1> 	; 29/05/2017
  2047                              <1> 	; 28/05/2017 - Erdogan Tan (Ref: KolibriOS, intelac97.asm)
  2048                              <1> 	;	
  2049 0001230F 66BA2C00            <1> 	mov	dx, GLOB_CNT_REG ; 2Ch
  2050 00012313 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2051 0001231A ED                  <1> 	in	eax, dx
  2052                              <1> 	; ?
  2053 0001231B 66BA3000            <1> 	mov	dx, GLOB_STS_REG ; 30h
  2054 0001231F 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2055 00012326 ED                  <1> 	in	eax, dx
  2056                              <1> 
  2057 00012327 83F8FF              <1> 	cmp	eax, 0FFFFFFFFh ; -1
  2058 0001232A 744B                <1> 	je	short init_ac97_codec_err1
  2059                              <1> 
  2060 0001232C A900030010          <1> 	test	eax, CTRL_ST_CREADY
  2061 00012331 7507                <1> 	jnz	short _ac97_codec_ready
  2062                              <1> 
  2063 00012333 E8EF020000          <1> 	call	reset_ac97_codec
  2064 00012338 723E                <1> 	jc	short init_ac97_codec_err2
  2065                              <1> 
  2066                              <1> _ac97_codec_ready:
  2067 0001233A 668B15[786B0100]    <1> 	mov	dx, [NAMBAR]
  2068                              <1> 	;add	dx, 0 ; ac_reg_0 ; reset register
  2069 00012341 66EF                <1> 	out	dx, ax
  2070                              <1> 
  2071 00012343 31C0                <1> 	xor	eax, eax ; 0
  2072 00012345 668B15[786B0100]    <1> 	mov	dx, [NAMBAR]
  2073 0001234C 6683C226            <1> 	add	dx, CODEC_REG_POWERDOWN	
  2074 00012350 66EF                <1> 	out	dx, ax
  2075                              <1> 
  2076                              <1> 	; 10/06/2017
  2077                              <1> 	; 29/05/2017
  2078                              <1> 	; wait for 1 second
  2079 00012352 B9E8030000          <1> 	mov	ecx, 1000 ; 1000*0.25ms = 1s
  2080                              <1> _ac97_codec_rloop:
  2081 00012357 E807F9FFFF          <1> 	call	delay1_4ms
  2082 0001235C E802F9FFFF          <1> 	call	delay1_4ms
  2083 00012361 E8FDF8FFFF          <1> 	call	delay1_4ms
  2084 00012366 E8F8F8FFFF          <1> 	call	delay1_4ms
  2085                              <1> 	;mov	dx, [NAMBAR]
  2086                              <1> 	;add	dx, CODEC_REG_POWERDOWN
  2087 0001236B 66ED                <1> 	in	ax, dx	
  2088 0001236D 6683E00F            <1> 	and	ax, 0Fh
  2089 00012371 3C0F                <1> 	cmp	al, 0Fh
  2090 00012373 7404                <1> 	je	short _ac97_codec_init_ok
  2091 00012375 E2E0                <1> 	loop	_ac97_codec_rloop 
  2092                              <1> 
  2093                              <1> init_ac97_codec_err1:
  2094 00012377 F9                  <1> 	stc
  2095                              <1> init_ac97_codec_err2:
  2096 00012378 C3                  <1> 	retn
  2097                              <1> 
  2098                              <1> _ac97_codec_init_ok:
  2099 00012379 B002                <1>         mov     al, 2 ; force set 16-bit 2-channel PCM
  2100 0001237B 66BA2C00            <1> 	mov	dx, GLOB_CNT_REG ; 2Ch
  2101 0001237F 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2102 00012386 EF                  <1> 	out	dx, eax
  2103                              <1> 
  2104                              <1> 	;call	delay1_4ms
  2105                              <1> 
  2106                              <1> 	; 10/06/2017
  2107 00012387 E849020000          <1> 	call 	reset_ac97_controller
  2108                              <1> 
  2109                              <1> ;	call 	setup_ac97_codec
  2110                              <1> ;
  2111                              <1> ;detect_ac97_codec:
  2112                              <1> ;	retn
  2113                              <1> 
  2114                              <1> setup_ac97_codec:
  2115                              <1> 	; 22/07/2020
  2116                              <1> 	; 10/06/2017
  2117                              <1> 	; 29/05/2017
  2118 0001238C B802020000          <1> 	mov     eax, 0202h
  2119 00012391 66A3[766B0100]      <1> 	mov	[audio_master_volume], ax
  2120 00012397 66B81F1F            <1> 	mov	ax, 1F1Fh ; 31, 31
  2121                              <1> 	
  2122 0001239B 668B15[786B0100]    <1>   	mov     dx, [NAMBAR]
  2123 000123A2 6683C202            <1>   	add     dx, CODEC_MASTER_VOL_REG	;02h 
  2124 000123A6 6631C0              <1>   	xor	ax, ax 	; volume attenuation = 0 (max. volume)
  2125 000123A9 66EF                <1>   	out     dx, ax
  2126                              <1>  
  2127 000123AB 668B15[786B0100]    <1>   	mov     dx, [NAMBAR]
  2128 000123B2 6683C206            <1>   	add     dx, CODEC_MASTER_MONO_VOL_REG	;06h 
  2129                              <1> 	;xor	ax, ax
  2130 000123B6 66EF                <1>   	out     dx, ax
  2131                              <1> 
  2132 000123B8 668B15[786B0100]    <1>   	mov     dx, [NAMBAR]
  2133 000123BF 6683C20A            <1>   	add     dx, CODEC_PCBEEP_VOL_REG	;0Ah 
  2134                              <1>   	;xor    ax, ax
  2135 000123C3 66EF                <1>   	out     dx, ax
  2136                              <1> 
  2137 000123C5 668B15[786B0100]    <1>   	mov     dx, [NAMBAR]
  2138 000123CC 6683C218            <1>   	add     dx, CODEC_PCM_OUT_REG		;18h 
  2139                              <1>   	;xor    ax, ax
  2140 000123D0 66EF                <1>   	out     dx, ax
  2141                              <1> 
  2142 000123D2 66B80880            <1> 	mov     ax, 8008h ; Mute
  2143 000123D6 668B15[786B0100]    <1>   	mov     dx, [NAMBAR]
  2144                              <1> 	; 22/07/2020
  2145 000123DD 6683C20C            <1> 	add	dx, CODEC_PHONE_VOL_REG		;0Ch
  2146                              <1> 				 ; AC97_PHONE_VOL ; TAD Input (Mono)
  2147 000123E1 66EF                <1>   	out     dx, ax
  2148                              <1> 
  2149 000123E3 66B80808            <1>         mov	ax, 0808h
  2150 000123E7 668B15[786B0100]    <1>   	mov     dx, [NAMBAR]
  2151 000123EE 6683C210            <1>         add	dx, CODEC_LINE_IN_VOL_REG ;10h ; Line Input (Stereo)	
  2152 000123F2 66EF                <1>   	out     dx, ax
  2153                              <1> 
  2154                              <1> 	;mov	ax, 0808h
  2155 000123F4 668B15[786B0100]    <1>   	mov     dx, [NAMBAR]
  2156 000123FB 6683C212            <1>         add	dx, CODEC_CD_VOL_REG ;12h ; CR Input (Stereo)
  2157 000123FF 66EF                <1>   	out     dx, ax
  2158                              <1> 
  2159                              <1> 	;mov	ax, 0808h
  2160 00012401 668B15[786B0100]    <1>   	mov     dx, [NAMBAR]
  2161 00012408 6683C216            <1>         add	dx, CODEC_AUX_VOL_REG ;16h ; Aux Input (Stereo)
  2162 0001240C 66EF                <1>   	out     dx, ax
  2163                              <1> 
  2164                              <1>         ;call    delay1_4ms
  2165                              <1>         ;call    delay1_4ms
  2166                              <1>         ;call    delay1_4ms
  2167                              <1>         ;call    delay1_4ms
  2168                              <1> 
  2169                              <1> detect_ac97_codec:
  2170 0001240E C3                  <1>         retn
  2171                              <1> 
  2172                              <1> set_ac97_bdl: ; Set AC97 (ICH) Buffer Descriptor List
  2173                              <1> 	; 17/06/2017
  2174                              <1> 	; 11/06/2017
  2175                              <1> 	; 28/05/2017
  2176                              <1> 	; eax = dma buffer address = [audio_DMA_buff]
  2177                              <1> 	; ecx = dma buffer buffer size = [audio_dmabuff_size]
  2178                              <1> 
  2179 0001240F D1E9                <1> 	shr	ecx, 1 ; dma half buffer size
  2180 00012411 89CE                <1> 	mov	esi, ecx
  2181                              <1> 
  2182 00012413 BF[7C6B0100]        <1>         mov     edi, audio_bdl_buff	; get BDL address
  2183 00012418 B910000000          <1>         mov     ecx, 32 / 2		; make 32 entries in BDL
  2184                              <1> 
  2185 0001241D EB05                <1> 	jmp	short s_ac97_bdl1 
  2186                              <1> 
  2187                              <1> s_ac97_bdl0:
  2188                              <1> 	; set buffer descriptor 0 to start of data file in memory
  2189                              <1> 
  2190 0001241F A1[606B0100]        <1>  	mov	eax, [audio_dma_buff]	; Physical address of DMA buffer
  2191                              <1>  
  2192                              <1> s_ac97_bdl1:
  2193 00012424 AB                  <1> 	stosd				; store dmabuffer1 address
  2194                              <1> 
  2195 00012425 89C2                <1> 	mov	edx, eax
  2196                              <1> 
  2197                              <1> ;
  2198                              <1> ; Buffer Descriptors List
  2199                              <1> ; As stated earlier, each buffer descriptor list is a set of (up to) 32 
  2200                              <1> ; descriptors, each 8 bytes in length. Bytes 0-3 of a descriptor entry point
  2201                              <1> ; to a chunk of memory to either play from or record to. Bytes 4-7 of an
  2202                              <1> ; entry describe various control things detailed below.
  2203                              <1> ; 
  2204                              <1> ; Buffer pointers must always be aligned on a Dword boundry.
  2205                              <1> ;
  2206                              <1> ;
  2207                              <1> 
  2208                              <1> ;IOC                     equ     BIT31	; Fire an interrupt whenever this
  2209                              <1>                                         ; buffer is complete.
  2210                              <1> 
  2211                              <1> ;BUP                     equ     BIT30  ; Buffer Underrun Policy.
  2212                              <1>                                         ; if this buffer is the last buffer
  2213                              <1>                                         ; in a playback, fill the remaining
  2214                              <1>                                         ; samples with 0 (silence) or not.
  2215                              <1>                                         ; It's a good idea to set this to 1
  2216                              <1>                                         ; for the last buffer in playback,
  2217                              <1>                                         ; otherwise you're likely to get a lot
  2218                              <1>                                         ; of noise at the end of the sound.
  2219                              <1> 
  2220                              <1> ;
  2221                              <1> ; Bits 15:0 contain the length of the buffer, in number of samples, which
  2222                              <1> ; are 16 bits each, coupled in left and right pairs, or 32bits each.
  2223                              <1> ; Luckily for us, that's the same format as .wav files.
  2224                              <1> ;
  2225                              <1> ; A value of FFFF is 65536 samples. Running at 44.1Khz, that's just about
  2226                              <1> ; 1.5 seconds of sample time. FFFF * 32bits is 1FFFFh bytes or 128k of data.
  2227                              <1> ;
  2228                              <1> ; A value of 0 in these bits means play no samples.
  2229                              <1> ;
  2230                              <1> 
  2231 00012427 89F0                <1> 	mov	eax, esi ; DMA half buffer size
  2232 00012429 01C2                <1> 	add	edx, eax
  2233 0001242B D1E8                <1> 	shr	eax, 1 ; count of 16 bit samples
  2234                              <1> 	;or	eax, IOC+BUP
  2235 0001242D 0D00000080          <1> 	or	eax, IOC ; 11/06/2017
  2236 00012432 AB                  <1> 	stosd
  2237                              <1> 
  2238                              <1> ; 2nd buffer:
  2239                              <1> 
  2240 00012433 89D0                <1>         mov	eax, edx ; Physical address of the 2nd half of DMA buffer	
  2241 00012435 AB                  <1> 	stosd		 ; store dmabuffer2 address
  2242                              <1> 
  2243                              <1> ; set length to [audio_dmabuff_size]/2
  2244                              <1> ; Set control (bits 31:16) to BUP, bits 15:0=number of samples
  2245                              <1> ; 
  2246 00012436 89F0                <1> 	mov	eax, esi ; DMA half buffer size
  2247 00012438 D1E8                <1> 	shr	eax, 1 ; count of 16 bit samples
  2248                              <1> 	;or	eax, IOC+BUP
  2249 0001243A 0D00000080          <1> 	or	eax, IOC ; 11/06/2017
  2250 0001243F AB                  <1> 	stosd
  2251                              <1> 
  2252 00012440 E2DD                <1> 	loop    s_ac97_bdl0
  2253                              <1> 	
  2254 00012442 C3                  <1> 	retn
  2255                              <1> 
  2256                              <1> ac97_start_play:  
  2257                              <1> 	; 28/05/2017
  2258                              <1> 	; Derived from 'playWav' procedure in 'ICHWAV.ASM'
  2259                              <1> 	; .wav player for DOS by Jeff Leyda (02/09/2002)
  2260                              <1> 
  2261                              <1> 	; set output rate
  2262                              <1> 	; entry: [audio_freq] = desired sample rate
  2263                              <1> 		
  2264 00012443 668B15[786B0100]    <1> 	mov    	dx, [NAMBAR]               	
  2265 0001244A 6683C22A            <1> 	add    	dx, CODEC_EXT_AUDIO_CTRL_REG  	; 2Ah  	  
  2266 0001244E 66ED                <1> 	in     	ax, dx
  2267 00012450 6683C801            <1> 	or	ax, 1
  2268 00012454 66EF                <1> 	out	dx, ax 				; Enable variable rate audio
  2269                              <1> 
  2270                              <1>        ;call    delay1_4ms
  2271                              <1>        ;call    delay1_4ms
  2272                              <1>        ;call    delay1_4ms
  2273                              <1>        ;call    delay1_4ms
  2274                              <1> 
  2275 00012456 66A1[726B0100]      <1> 	mov	ax, [audio_freq]		; sample rate
  2276                              <1> 
  2277 0001245C 668B15[786B0100]    <1> 	mov    	dx, [NAMBAR]               	
  2278 00012463 6683C22C            <1> 	add    	dx, CODEC_PCM_FRONT_DACRATE_REG	; 2Ch  	  
  2279 00012467 66EF                <1> 	out	dx, ax 				; out sample rate
  2280                              <1> 		
  2281                              <1>        ;call    delay1_4ms
  2282                              <1>        ;call    delay1_4ms
  2283                              <1>        ;call    delay1_4ms
  2284                              <1>        ;call    delay1_4ms
  2285                              <1> 
  2286                              <1> ;
  2287                              <1> ; register reset the DMA engine. This may cause a pop noise on the output
  2288                              <1> ; lines when the device is reset. Prolly a better idea to mute output, then
  2289                              <1> ; reset.
  2290                              <1> ;
  2291 00012469 668B15[7A6B0100]    <1>         mov     dx, [NABMBAR]
  2292 00012470 6683C21B            <1>         add     dx, PO_CR_REG                  ; set pointer to Cntl reg
  2293 00012474 B002                <1>         mov     al, RR                         ; set reset
  2294 00012476 EE                  <1>         out     dx, al                         ; self clearing bit
  2295                              <1> ;
  2296                              <1> ;	mov	edi, audio_bdl_buff
  2297                              <1> ;	mov	edx, [audio_dmabuff_size]
  2298                              <1> ;	shr	edx, 1
  2299                              <1> ;	mov	ecx, 32/2
  2300                              <1> ;ac97_set_bdl_buffer:
  2301                              <1> ;	; 1st half of DMA buffer
  2302                              <1> ;	mov	eax, [audio_dma_buff]
  2303                              <1> ;	push	eax
  2304                              <1> ;	stosd
  2305                              <1> ;	mov	eax, edx ; dma buffer size / 2
  2306                              <1> ;	or	eax, IOC+BUP
  2307                              <1> ;	stosd
  2308                              <1> ;	pop	eax
  2309                              <1> ;	; 2nd half of DMA buffer
  2310                              <1> ;	add	eax, edx
  2311                              <1> ;	stosd
  2312                              <1> ;	mov	eax, edx ; dma buffer size / 2
  2313                              <1> ;	or	eax, IOC+BUP
  2314                              <1> ;	stosd
  2315                              <1> ;	loop	ac97_set_bdl_buffer
  2316                              <1>  	
  2317                              <1> ; tell the DMA engine where to find our list of Buffer Descriptors.
  2318                              <1> ; this 32bit value is a flat mode memory offset (ie no segment:offset)
  2319                              <1> ;
  2320                              <1> ; write NABMBAR+10h with offset of buffer descriptor list
  2321                              <1> ;
  2322 00012477 B8[7C6B0100]        <1>         mov	eax, audio_bdl_buff
  2323 0001247C 668B15[7A6B0100]    <1> 	mov	dx, [NABMBAR]
  2324 00012483 6683C210            <1> 	add	dx, PO_BDBAR_REG
  2325 00012487 EF                  <1> 	out	dx, eax
  2326                              <1> ;
  2327                              <1> ; All set. Let's play some music.
  2328                              <1> ;
  2329                              <1> ;
  2330 00012488 B81F000000          <1> 	mov	eax, 31
  2331 0001248D E816000000          <1> 	call    set_ac97_LastValidIndex
  2332                              <1> 
  2333 00012492 C605[746B0100]01    <1> 	mov	byte [audio_play_cmd], 1 ; play command (do not stop) !
  2334                              <1> 
  2335                              <1> ac97_play: ; continue to play (after pause)
  2336                              <1> 	; 11/06/2017
  2337                              <1> 	; 29/05/2017
  2338                              <1> 	; 28/05/2017
  2339 00012499 668B15[7A6B0100]    <1>         mov     dx, [NABMBAR]
  2340 000124A0 6683C21B            <1>         add     dx, PO_CR_REG		; PCM out control register
  2341 000124A4 B011                <1>         mov	al, IOCE+RPBM ; 29/05/2017
  2342                              <1>         ;mov	al, 1Dh ; (Ref: KolibriOS, intelac97.asm, 'play:')
  2343 000124A6 EE                  <1> 	out     dx, al			; set start!
  2344                              <1> 
  2345                              <1> 	;mov	byte [audio_play_cmd], 1 ; play command (do not stop) !
  2346                              <1> 
  2347 000124A7 C3                  <1> 	retn
  2348                              <1> 
  2349                              <1> ;input AL = index # to stop on
  2350                              <1> set_ac97_LastValidIndex:
  2351                              <1> 	; 28/05/2017
  2352                              <1> 	; Derived from 'setLastValidIndex' procedure in 'ICHWAV.ASM'
  2353                              <1> 	; .wav player for DOS by Jeff Leyda (02/09/2002)
  2354 000124A8 668B15[7A6B0100]    <1> 	mov	dx, [NABMBAR]
  2355 000124AF 6683C215            <1> 	add	dx, PO_LVI_REG
  2356 000124B3 EE                  <1>         out     dx, al
  2357                              <1> 	;mov	[audio_lvi], al ; for ac97_int_handler
  2358 000124B4 C3                  <1> 	retn
  2359                              <1> 
  2360                              <1> ac97_volume:
  2361                              <1> 	; 28/05/2017
  2362                              <1> 	; bl = component (0 = master/playback/lineout volume)
  2363                              <1> 	; cl = left channel volume level (0 to 31)
  2364                              <1> 	; ch = right channel volume level (0 to 31)
  2365                              <1> 
  2366 000124B5 08DB                <1> 	or	bl, bl
  2367 000124B7 7523                <1> 	jnz	short ac97_vol_1 ; temporary !
  2368 000124B9 66B81F1F            <1> 	mov	ax, 1F1Fh ; 31,31
  2369 000124BD 38C1                <1> 	cmp	cl, al
  2370 000124BF 771B                <1> 	ja	short ac97_vol_1 ; temporary !
  2371 000124C1 38E5                <1> 	cmp	ch, ah
  2372 000124C3 7717                <1> 	ja	short ac97_vol_1 ; temporary !
  2373 000124C5 66890D[766B0100]    <1> 	mov	[audio_master_volume], cx
  2374 000124CC 6629C8              <1> 	sub	ax, cx
  2375 000124CF 668B15[786B0100]    <1>   	mov     dx, [NAMBAR]
  2376 000124D6 6683C202            <1>   	add     dx, CODEC_MASTER_VOL_REG  ; 02h ; Line Out 
  2377 000124DA 66EF                <1>   	out     dx, ax
  2378                              <1> ac97_vol_1:
  2379 000124DC C3                  <1> 	retn
  2380                              <1> 
  2381                              <1> ac97_int_handler:
  2382                              <1> 	; 12/10/2017
  2383                              <1> 	; 10/10/2017
  2384                              <1> 	; 09/10/2017
  2385                              <1> 	; 13/06/2017, 13/06/2017
  2386                              <1> 	; 10/06/2017, 11/06/2017
  2387                              <1> 	; Interrupt Handler for AC97 (ICH) Audio Controller
  2388                              <1> 	; Note: called by 'dev_IRQ_service' 
  2389                              <1> 	; 28/05/2017
  2390                              <1> 
  2391                              <1> 	;push	eax ; * must be saved !
  2392                              <1> 	;push	edx
  2393                              <1> 	;push	ecx
  2394                              <1> 	;push	ebx ; * must be saved !
  2395                              <1> 	;push	esi
  2396                              <1> 	;push	edi
  2397                              <1> 
  2398                              <1> 	;cmp	byte [audio_busy], 1
  2399                              <1> 	;jnb	_ac97_ih2	; busy !
  2400                              <1> 
  2401 000124DD 66BA3000            <1>         mov     dx, GLOB_STS_REG
  2402 000124E1 660315[7A6B0100]    <1>         add	dx, [NABMBAR]
  2403 000124E8 ED                  <1> 	in	eax, dx
  2404                              <1> 
  2405 000124E9 83F8FF              <1>         cmp     eax, 0FFFFFFFFh ; -1
  2406 000124EC 0F849A000000        <1>         je      _ac97_ih3 ; exit
  2407                              <1> 
  2408 000124F2 A940000000          <1>         test    eax, 40h ; PCM Out Interrupt
  2409 000124F7 750E                <1>         jnz     short _ac97_ih0
  2410                              <1> 
  2411 000124F9 85C0                <1> 	test	eax, eax
  2412 000124FB 0F848B000000        <1> 	jz	_ac97_ih3 ; exit
  2413                              <1> 
  2414                              <1>  	;mov	dx, GLOB_STS_REG
  2415                              <1>         ;add	dx, [NABMBAR]
  2416 00012501 EF                  <1> 	out	dx, eax
  2417                              <1> 
  2418 00012502 E985000000          <1> 	jmp	_ac97_ih3 ; exit
  2419                              <1> 
  2420                              <1> _ac97_ih0:
  2421 00012507 50                  <1> 	push	eax
  2422                              <1> 	; 09/10/2017
  2423 00012508 803D[746B0100]01    <1> 	cmp	byte [audio_play_cmd], 1
  2424 0001250F 727C                <1> 	jb	short _ac97_ih4 ; stop command !
  2425                              <1> 
  2426                              <1> 	;mov	byte [audio_busy], 1
  2427                              <1> 
  2428                              <1> 	;mov	al, 10h
  2429                              <1> 	;mov	dx, PO_CR_REG
  2430                              <1>         ;add	dx, [NABMBAR]
  2431                              <1> 	;out	dx, al
  2432                              <1> 
  2433 00012511 66B81C00            <1> 	mov	ax, 1Ch ; FIFOE(=16)+BCIS(=8)+LVBCI(=4)
  2434 00012515 66BA1600            <1> 	mov	dx, PO_SR_REG
  2435 00012519 660315[7A6B0100]    <1>         add	dx, [NABMBAR]
  2436 00012520 66EF                <1> 	out	dx, ax
  2437                              <1> 
  2438 00012522 66BA1400            <1> 	mov	dx, PO_CIV_REG
  2439 00012526 660315[7A6B0100]    <1>         add	dx, [NABMBAR]
  2440 0001252D EC                  <1> 	in	al, dx
  2441                              <1> 
  2442                              <1> 	;cmp	al, [audio_civ] ; [audio_flag]
  2443                              <1> 	;je	short _ac97_ih2
  2444                              <1> 
  2445 0001252E A2[756B0100]        <1> 	mov	[audio_civ], al
  2446 00012533 FEC8                <1> 	dec	al
  2447                              <1> 	;inc	al ; 11/06/2017
  2448 00012535 241F                <1> 	and	al, 1Fh
  2449                              <1> 
  2450 00012537 66BA1500            <1>         mov     dx, PO_LVI_REG
  2451 0001253B 660315[7A6B0100]    <1>         add	dx, [NABMBAR]
  2452 00012542 EE                  <1>         out	dx, al
  2453                              <1> 
  2454                              <1> 	; 12/10/2017
  2455 00012543 A0[756B0100]        <1> 	mov	al, [audio_civ]
  2456 00012548 FEC0                <1> 	inc	al
  2457 0001254A 2401                <1> 	and	al, 1
  2458 0001254C A2[686B0100]        <1> 	mov	[audio_flag], al 
  2459                              <1> 	;; [audio_flag] : 0 = Buffer 1, 1 = Buffer 2
  2460                              <1> 	;
  2461 00012551 58                  <1> 	pop	eax
  2462                              <1> 	;
  2463 00012552 83E040              <1> 	and     eax, 40h
  2464 00012555 668B15[7A6B0100]    <1>         mov	dx, [NABMBAR]
  2465 0001255C 6683C230            <1> 	add	dx, GLOB_STS_REG
  2466 00012560 EF                  <1> 	out	dx, eax
  2467                              <1> 
  2468                              <1> 	;; 13/06/2017
  2469                              <1> 	;mov	al, 11h ; IOCE + RPBM
  2470                              <1> 	;mov	dx, PO_CR_REG
  2471                              <1>         ;add	dx, [NABMBAR]
  2472                              <1> 	;out	dx, al
  2473                              <1> 
  2474                              <1> ac97_tuneloop:
  2475                              <1> 	; 09/10/2017
  2476 00012561 8B3D[606B0100]      <1> 	mov	edi, [audio_dma_buff]
  2477 00012567 8B0D[646B0100]      <1> 	mov	ecx, [audio_dmabuff_size]
  2478 0001256D D1E9                <1> 	shr	ecx, 1 ; dma buff size / 2 = half buffer size
  2479                              <1> 
  2480                              <1> 	; 12/10/2017
  2481 0001256F 803D[686B0100]00    <1> 	cmp 	byte [audio_flag], 0
  2482 00012576 7702                <1> 	ja	short _ac97_ih1  ; Playing Half Buffer 2 (Current: FLAG)
  2483                              <1> 	; Playing Half Buffer 1 (Current: EOL)	
  2484 00012578 01CF                <1> 	add	edi, ecx
  2485                              <1> _ac97_ih1: 
  2486                              <1> 	; Update half buffer 2 while playing half buffer 1 (next: FLAG)
  2487                              <1> 	; Update half buffer 1 while playing half buffer 2 (next: EOL)
  2488                              <1> 
  2489 0001257A 8B35[586B0100]      <1> 	mov	esi, [audio_p_buffer] ; phy addr of audio buff
  2490 00012580 C1E902              <1> 	shr	ecx, 2 ; half buff size / 4
  2491 00012583 F3A5                <1> 	rep	movsd 
  2492                              <1> 
  2493                              <1> 	; 10/10/2017
  2494                              <1> 	; switch flag value
  2495 00012585 8035[686B0100]01    <1> 	xor	byte [audio_flag], 1
  2496                              <1> 	; 12/10/2017
  2497                              <1> 	; [audio_flag] = 0 : Playing dma half buffer 2 (even index value)
  2498                              <1> 			   ; Next buffer (to update) is dma half buff 1
  2499                              <1> 	; 	       = 1 : Playing dma half buffer 1 (odd index value)
  2500                              <1> 			   ; Next buffer (to update) is dma half buff 2
  2501                              <1> 
  2502                              <1> _ac97_ih2:
  2503                              <1> 	;mov	byte [audio_busy], 0
  2504                              <1> _ac97_ih3:
  2505                              <1> 	;pop	edi
  2506                              <1> 	;pop	esi
  2507                              <1> 	;pop	ebx ; * must be restored !
  2508                              <1> 	;pop	ecx
  2509                              <1> 	;pop	edx
  2510                              <1> 	;pop	eax ; * must be restored !
  2511                              <1> 
  2512 0001258C C3                  <1> 	retn
  2513                              <1> 
  2514                              <1> _ac97_ih4:
  2515                              <1> 	; 09/10/2017
  2516 0001258D E818000000          <1> 	call	_ac97_stop
  2517                              <1> 	;
  2518 00012592 58                  <1> 	pop	eax
  2519                              <1> 	;
  2520 00012593 83E040              <1> 	and     eax, 40h
  2521 00012596 668B15[7A6B0100]    <1>         mov	dx, [NABMBAR]
  2522 0001259D 6683C230            <1> 	add	dx, GLOB_STS_REG
  2523 000125A1 EF                  <1> 	out	dx, eax
  2524                              <1> 
  2525                              <1> 	;; 13/06/2017
  2526                              <1> 	;mov	al, 11h ; IOCE + RPBM
  2527                              <1> 	;dx, PO_CR_REG
  2528                              <1>         ;add	dx, [NABMBAR]
  2529                              <1> 	;out	dx, al
  2530                              <1> 
  2531                              <1> 	; 10/10/2017
  2532                              <1> 	;jmp	short _ac97_ih3  ; exit
  2533 000125A2 C3                  <1> 	retn
  2534                              <1> 
  2535                              <1> ac97_stop: 
  2536                              <1> 	; 28/05/2017
  2537 000125A3 C605[746B0100]00    <1> 	mov	byte [audio_play_cmd], 0 ; stop !
  2538                              <1> _ac97_stop: ; 09/10/2017
  2539                              <1> 	; 29/05/2017
  2540                              <1> 	;mov	dx, [NABMBAR]
  2541                              <1> 	;add	dx, PO_CR_REG
  2542                              <1> 	;mov	al, 0
  2543                              <1> 	;out	dx, al
  2544                              <1> 
  2545                              <1> 	; 11/06/2017
  2546 000125AA 30C0                <1> 	xor	al, al ; 0
  2547 000125AC E813000000          <1> 	call	ac97_po_cmd
  2548                              <1> 
  2549                              <1> 	; (Ref: KolibriOS, intelac97.asm, 'stop:')
  2550                              <1> 	; Clear FIFOE, BCIS, LVBCI (Ref: Intel ICH hub manual)
  2551 000125B1 66B81C00            <1> 	mov     ax, 1Ch
  2552 000125B5 668B15[7A6B0100]    <1> 	mov     dx, [NABMBAR]
  2553 000125BC 6683C216            <1> 	add     dx, PO_SR_REG
  2554 000125C0 66EF                <1> 	out     dx, ax
  2555                              <1> 
  2556                              <1> 	;retn
  2557                              <1> 
  2558                              <1> 	; 11/06/2017
  2559 000125C2 B002                <1> 	mov     al, RR
  2560                              <1> ac97_po_cmd:
  2561                              <1> 	 ;11/06/2017
  2562                              <1> 	; 29/05/2017
  2563 000125C4 668B15[7A6B0100]    <1> 	mov     dx, [NABMBAR]
  2564 000125CB 6683C21B            <1>         add     dx, PO_CR_REG		; PCM out control register
  2565 000125CF EE                  <1> 	out	dx, al
  2566 000125D0 C3                  <1> 	retn
  2567                              <1> 
  2568                              <1> ac97_pause:
  2569                              <1> 	; 11/06/2017
  2570                              <1> 	; 29/05/2017
  2571 000125D1 B010                <1> 	mov 	al, IOCE
  2572 000125D3 EBEF                <1> 	jmp	short ac97_po_cmd
  2573                              <1> 
  2574                              <1> reset_ac97_controller:
  2575                              <1> 	; 10/06/2017
  2576                              <1> 	; 29/05/2017
  2577                              <1> 	; 28/05/2017
  2578                              <1> 	; reset AC97 audio controller registers
  2579 000125D5 31C0                <1> 	xor     eax, eax
  2580 000125D7 66BA0B00            <1>         mov	dx, PI_CR_REG
  2581 000125DB 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2582 000125E2 EE                  <1> 	out     dx, al
  2583                              <1> 
  2584 000125E3 66BA1B00            <1>         mov     dx, PO_CR_REG
  2585 000125E7 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2586 000125EE EE                  <1> 	out     dx, al
  2587                              <1> 
  2588 000125EF 66BA2B00            <1>         mov     dx, MC_CR_REG
  2589 000125F3 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2590 000125FA EE                  <1> 	out     dx, al
  2591                              <1> 
  2592 000125FB B002                <1>         mov     al, RR
  2593 000125FD 66BA0B00            <1>         mov     dx, PI_CR_REG
  2594 00012601 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2595 00012608 EE                  <1> 	out     dx, al
  2596                              <1> 
  2597 00012609 66BA1B00            <1>         mov     dx, PO_CR_REG
  2598 0001260D 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2599 00012614 EE                  <1> 	out     dx, al
  2600                              <1> 
  2601 00012615 66BA2B00            <1>         mov     dx, MC_CR_REG
  2602 00012619 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2603 00012620 EE                  <1> 	out     dx, al
  2604                              <1> 
  2605 00012621 C3                  <1> 	retn
  2606                              <1> 
  2607                              <1> ac97_reset:
  2608                              <1> 	; 10/06/2017
  2609                              <1> 	; 29/05/2017
  2610                              <1> 	; 28/05/2017
  2611 00012622 E8AEFFFFFF          <1> 	call	reset_ac97_controller
  2612                              <1> 	; 29/05/2017
  2613                              <1> 	;jmp	reset_ac97_codec
  2614                              <1> reset_ac97_codec:
  2615                              <1> 	; 28/05/2017 - Erdogan Tan (Ref: KolibriOS, intelac97.asm)
  2616 00012627 66BA2C00            <1> 	mov	dx, GLOB_CNT_REG ; 2Ch
  2617 0001262B 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2618 00012632 ED                  <1> 	in	eax, dx
  2619                              <1> 
  2620 00012633 A902000000          <1> 	test	eax, 2
  2621 00012638 7407                <1> 	jz	short _r_ac97codec_cold	
  2622                              <1> 
  2623 0001263A E80F000000          <1> 	call	warm_ac97codec_reset
  2624 0001263F 7308                <1> 	jnc	short _r_ac97codec_ok
  2625                              <1> _r_ac97codec_cold:
  2626 00012641 E83D000000          <1>         call    cold_ac97codec_reset
  2627 00012646 7301                <1>         jnc     short _r_ac97codec_ok
  2628                              <1> 	
  2629                              <1> 	; 16/04/2017
  2630                              <1>         ;xor     eax, eax         ; timeout error
  2631                              <1>        	;stc
  2632 00012648 C3                  <1> 	retn
  2633                              <1> 
  2634                              <1> _r_ac97codec_ok:
  2635 00012649 31C0                <1>         xor     eax, eax
  2636                              <1>         ;mov	al, VIA_ACLINK_C00_READY ; 1
  2637 0001264B FEC0                <1>         inc	al
  2638 0001264D C3                  <1> 	retn
  2639                              <1> 
  2640                              <1> warm_ac97codec_reset:
  2641                              <1> 	; 28/05/2017 - Erdogan Tan (Ref: KolibriOS, intelac97.asm)
  2642 0001264E B806000000          <1>         mov     eax, 6
  2643 00012653 66BA2C00            <1> 	mov	dx, GLOB_CNT_REG ; 2Ch
  2644 00012657 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2645 0001265E EF                  <1> 	out	dx, eax
  2646                              <1> 
  2647 0001265F B90A000000          <1> 	mov	ecx, 10	; total 1s
  2648                              <1> _warm_ac97c_rst_wait:
  2649 00012664 51                  <1> 	push	ecx
  2650 00012665 E8ECF5FFFF          <1> 	call	delay_100ms
  2651 0001266A 59                  <1> 	pop	ecx
  2652                              <1> 
  2653 0001266B 66BA3000            <1> 	mov	dx, GLOB_STS_REG ; 30h
  2654 0001266F 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2655 00012676 ED                  <1> 	in	eax, dx
  2656                              <1> 
  2657 00012677 A900030010          <1> 	test	eax, CTRL_ST_CREADY
  2658 0001267C 7504                <1> 	jnz	short _warm_ac97c_rst_ok
  2659                              <1> 
  2660 0001267E 49                  <1>         dec     ecx
  2661 0001267F 75E3                <1>         jnz     short _warm_ac97c_rst_wait
  2662                              <1> 
  2663                              <1> _warm_ac97c_rst_fail:
  2664 00012681 F9                  <1>         stc
  2665                              <1> _warm_ac97c_rst_ok:
  2666 00012682 C3                  <1> 	retn
  2667                              <1> 
  2668                              <1> cold_ac97codec_reset:
  2669                              <1> 	; 28/05/2017 - Erdogan Tan (Ref: KolibriOS, intelac97.asm)
  2670 00012683 B802000000          <1>         mov     eax, 2
  2671 00012688 66BA2C00            <1> 	mov	dx, GLOB_CNT_REG ; 2Ch
  2672 0001268C 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2673 00012693 EF                  <1> 	out	dx, eax
  2674                              <1> 
  2675 00012694 E8BDF5FFFF          <1> 	call	delay_100ms 	; wait 100 ms
  2676 00012699 E8B8F5FFFF          <1> 	call	delay_100ms 	; wait 100 ms
  2677 0001269E E8B3F5FFFF          <1> 	call	delay_100ms 	; wait 100 ms
  2678 000126A3 E8AEF5FFFF          <1> 	call	delay_100ms 	; wait 100 ms
  2679                              <1> 
  2680 000126A8 B910000000          <1> 	mov	ecx, 16	; total 20*100 ms = 2s
  2681                              <1> _cold_ac97c_rst_wait:
  2682 000126AD 66BA3000            <1> 	mov	dx, GLOB_STS_REG ; 30h
  2683 000126B1 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2684 000126B8 ED                  <1> 	in	eax, dx
  2685                              <1> 
  2686 000126B9 A900030010          <1> 	test	eax, CTRL_ST_CREADY
  2687 000126BE 750B                <1> 	jnz	short _cold_ac97c_rst_ok
  2688                              <1> 
  2689 000126C0 51                  <1> 	push	ecx
  2690 000126C1 E890F5FFFF          <1> 	call	delay_100ms
  2691 000126C6 59                  <1> 	pop	ecx
  2692                              <1> 
  2693 000126C7 49                  <1>         dec     ecx
  2694 000126C8 75E3                <1>         jnz     short _cold_ac97c_rst_wait
  2695                              <1> 
  2696                              <1> _cold_ac97c_rst_fail:
  2697 000126CA F9                  <1>         stc
  2698                              <1> _cold_ac97c_rst_ok:
  2699 000126CB C3                  <1> 	retn
  2700                              <1> 
  2701                              <1> sb16_current_sound_data:
  2702                              <1> 	; 20/08/2017
  2703                              <1> 	; 24/06/2017
  2704                              <1> 	; 22/06/2017
  2705                              <1> 	; get current sound (PCM out) data for graphics
  2706                              <1> 	; (for Sound Blaster 16)
  2707                              <1> 	; ebx = Physical address (on page boundary)
  2708                              <1> 	; ecx = Byte count
  2709                              <1> 	; [audio_buff_size]
  2710                              <1> 
  2711                              <1> 	;;mov	edi, [audio_buff_size]
  2712                              <1> 	;mov	edi, [audio_dmabuff_size]
  2713                              <1> 	;mov	esi, [audio_dma_buff]
  2714 000126CC 39CF                <1> 	cmp	edi, ecx
  2715 000126CE 7302                <1> 	jnb	short sb16_gcd_0
  2716 000126D0 89F9                <1> 	mov	ecx, edi
  2717                              <1> sb16_gcd_0:
  2718                              <1> 	; 20/08/2017
  2719 000126D2 803D[706B0100]10    <1> 	cmp	byte [audio_bps], 16
  2720 000126D9 750F                <1> 	jne	short sb16_gcd_1 ; 8 bit DMA channel
  2721 000126DB E4C6                <1> 	in	al, 0C6h ; DMA channel 5 count register
  2722 000126DD 88C2                <1> 	mov	dl, al	
  2723 000126DF E4C6                <1> 	in	al, 0C6h
  2724 000126E1 88C6                <1> 	mov     dh, al
  2725 000126E3 0FB7C2              <1> 	movzx	eax, dx
  2726 000126E6 D1E0                <1> 	shl	eax, 1 ; word count -> byte count
  2727 000126E8 EB4E                <1> 	jmp	short sb16_gcd_2	
  2728                              <1> sb16_gcd_1:
  2729 000126EA E403                <1> 	in	al, 03h ; DMA channel 1 count register
  2730 000126EC 88C2                <1> 	mov	dl, al	
  2731 000126EE E403                <1> 	in	al, 03h
  2732 000126F0 88C6                <1> 	mov     dh, al
  2733 000126F2 0FB7C2              <1> 	movzx	eax, dx
  2734 000126F5 EB41                <1> 	jmp	short sb16_gcd_2
  2735                              <1> ;sb16_gcd_2:	
  2736                              <1> ;	cmp	eax, ecx
  2737                              <1> ;	jnb	short sb16_gcd_3 
  2738                              <1> ;	; remain count < graphics bytes
  2739                              <1> ;	mov	eax, ecx ; fix remain count to data size
  2740                              <1> ;sb16_gcd_3:	
  2741                              <1> ;	sub	edi, eax
  2742                              <1> ;	jna	short sb16_gcd_4
  2743                              <1> ;	add	esi, edi ; dma buffer offset
  2744                              <1> ;sb16_gcd_4:
  2745                              <1> ;	mov	edi, ebx ; buffer address (for graphics) 
  2746                              <1> ;	mov	[u.r0], ecx
  2747                              <1> ;	rep	movsb
  2748                              <1> ;	retn
  2749                              <1> 
  2750                              <1> get_current_sound_data:
  2751                              <1> 	; 24/06/2017
  2752                              <1> 	; 22/06/2017
  2753                              <1> 	; get current sound (PCM out) data for graphics
  2754                              <1> 	;
  2755                              <1> 	; ebx = Physical address (on page boundary)
  2756                              <1> 	; ecx = Byte count
  2757                              <1> 	; [audio_buff_size]
  2758                              <1> 
  2759                              <1> 	;mov	edi, [audio_buff_size]
  2760 000126F7 8B3D[646B0100]      <1> 	mov	edi, [audio_dmabuff_size]
  2761 000126FD 8B35[606B0100]      <1> 	mov	esi, [audio_dma_buff]
  2762 00012703 803D[416B0100]02    <1> 	cmp	byte [audio_device], 2
  2763 0001270A 72C0                <1> 	jb	short sb16_current_sound_data ; = 1
  2764 0001270C D1EF                <1> 	shr	edi, 1
  2765 0001270E 39CF                <1> 	cmp	edi, ecx
  2766 00012710 7302                <1> 	jnb	short gcd_0
  2767 00012712 89F9                <1> 	mov	ecx, edi
  2768                              <1> gcd_0:
  2769 00012714 803D[416B0100]03    <1> 	cmp	byte [audio_device], 3
  2770 0001271B 7232                <1> 	jb	short ac97_current_sound_data ; = 2
  2771                              <1> 	; = 3
  2772                              <1> vt8233_current_sound_data:
  2773                              <1> 	; 22/06/2017
  2774                              <1> 	; 21/06/2017
  2775                              <1> 	; get current sound (PCM out) data for graphics
  2776                              <1> 	; (for VT 8233, VT 8237R)
  2777                              <1> 	; ebx = Physical address (on page boundary)
  2778                              <1> 	; ecx = Byte count
  2779                              <1> 	; [audio_buff_size]
  2780                              <1> 	
  2781                              <1> 	;;mov	edi, [audio_buff_size]
  2782                              <1> 	;mov	edi, [audio_dmabuff_size]
  2783                              <1> 	;mov	esi, [audio_dma_buff]
  2784                              <1> 	;shr	edi, 1
  2785                              <1> 	;cmp	edi, ecx
  2786                              <1> 	;jnb	short vt8233_gcd_1
  2787                              <1> 	;mov	ecx, edi
  2788                              <1> vt8233_gcd_1:
  2789 0001271D BA0C000000          <1> 	mov	edx, VIA_REG_OFFSET_CURR_COUNT
  2790 00012722 E88FF5FFFF          <1> 	call	ctrl_io_r32
  2791 00012727 89C2                <1> 	mov	edx, eax ; remain count (bits 23-0),
  2792                              <1> 			 ; SGD index (bits 31-24) 
  2793 00012729 81E200000001        <1> 	and	edx, 1000000h ; SGD index (0 = 1st half)
  2794 0001272F 7402                <1> 	jz	short vt8233_gcd_2
  2795                              <1> 	; the second half of DMA buffer
  2796 00012731 01FE                <1> 	add	esi, edi 
  2797                              <1> vt8233_gcd_2:	
  2798 00012733 25FFFFFF00          <1> 	and	eax, 0FFFFFFh ; bits 23-0
  2799                              <1> ac97_gcd_2:
  2800                              <1> sb16_gcd_2:
  2801 00012738 39C8                <1> 	cmp	eax, ecx
  2802 0001273A 7302                <1> 	jnb	short vt8233_gcd_3 
  2803                              <1> 	; remain count < graphics bytes
  2804 0001273C 89C8                <1> 	mov	eax, ecx ; fix remain count to data size
  2805                              <1> vt8233_gcd_3:
  2806 0001273E 29C7                <1> 	sub	edi, eax
  2807 00012740 7602                <1> 	jna	short vt8233_gcd_4
  2808 00012742 01FE                <1> 	add	esi, edi ; dma buffer offset
  2809                              <1> vt8233_gcd_4:
  2810 00012744 89DF                <1> 	mov	edi, ebx ; buffer address (for graphics) 
  2811 00012746 890D[64030300]      <1> 	mov	[u.r0], ecx
  2812 0001274C F3A4                <1> 	rep	movsb
  2813                              <1> vt8233_gcd_5:
  2814 0001274E C3                  <1> 	retn
  2815                              <1> 
  2816                              <1> ac97_current_sound_data:
  2817                              <1> 	; 23/06/2017
  2818                              <1> 	; 22/06/2017
  2819                              <1> 	; get current sound (PCM out) data for graphics
  2820                              <1> 	; (for AC'97, ICH)
  2821                              <1> 	; ebx = Physical address (on page boundary)
  2822                              <1> 	; ecx = Byte count
  2823                              <1> 	; [audio_buff_size]
  2824                              <1> 	
  2825                              <1> 	;;mov	edi, [audio_buff_size]
  2826                              <1> 	;mov	edi, [audio_dmabuff_size]
  2827                              <1> 	;mov	esi, [audio_dma_buff]
  2828                              <1> 	;shr	edi, 1
  2829                              <1> 	;cmp	edi, ecx
  2830                              <1> 	;jnb	short ac97_gcd_0
  2831                              <1> 	;mov	ecx, edi
  2832                              <1> ac97_gcd_0:
  2833 0001274F 66BA1400            <1> 	mov	dx, PO_CIV_REG ; Position In Current Buff Reg
  2834 00012753 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2835 0001275A EC                  <1> 	in	al, dx ; current index value
  2836 0001275B A801                <1> 	test	al, 1
  2837 0001275D 7402                <1> 	jz	short ac97_gcd_1
  2838 0001275F 01FE                <1> 	add	esi, edi
  2839                              <1> ac97_gcd_1:
  2840 00012761 31C0                <1> 	xor	eax, eax
  2841 00012763 66BA1800            <1> 	mov	dx, PO_PICB_REG ; Position In Current Buff Reg
  2842 00012767 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2843 0001276E 66ED                <1> 	in	ax, dx ; remain dwords
  2844 00012770 C1E002              <1> 	shl	eax, 2 ; remain bytes ; 23/06/2017 
  2845 00012773 EBC3                <1> 	jmp	short ac97_gcd_2
  2846                              <1> ;	cmp	eax, ecx
  2847                              <1> ;	jnb	short ac97_gcd_2 
  2848                              <1> ;	; remain count < graphics bytes
  2849                              <1> ;	mov	eax, ecx ; fix remain count to data size
  2850                              <1> ;ac97_gcd_2:	
  2851                              <1> ;	sub	edi, eax
  2852                              <1> ;	jna	short ac97_gcd_3
  2853                              <1> ;	add	esi, edi ; dma buffer offset
  2854                              <1> ;ac97_gcd_3:
  2855                              <1> ;	mov	edi, ebx ; buffer address (for graphics) 
  2856                              <1> ;	mov	[u.r0], ecx
  2857                              <1> ;	rep	movsb
  2858                              <1> ;	retn
  2859                              <1> 
  2860                              <1> sb16_get_dma_buff_off:
  2861                              <1> 	; 28/10/2017
  2862                              <1> 	; 24/06/2017
  2863                              <1> 	; 22/06/2017
  2864                              <1> 	; get current (PCM OUT DMA buffer) pointer
  2865                              <1> 	; (for Sound Blaster 16)
  2866                              <1> 
  2867                              <1> 	;mov	ecx, [audio_dmabuff_size]
  2868                              <1> 	;xor	ebx, ebx
  2869                              <1> 	;shr	ecx, 1
  2870                              <1> sb16_gdmabo_0:
  2871                              <1> 	; 28/10/2017
  2872 00012775 803D[706B0100]10    <1> 	cmp	byte [audio_bps], 16
  2873 0001277C 750F                <1> 	jne	short sb16_gdmabo_1 ; 8 bit DMA channel
  2874                              <1> 	; 16 bit DMA channel
  2875 0001277E E4C6                <1> 	in	al, 0C6h ; DMA channel 5 count register
  2876 00012780 88C2                <1> 	mov	dl, al	
  2877 00012782 E4C6                <1> 	in	al, 0C6h
  2878 00012784 88C6                <1> 	mov     dh, al
  2879 00012786 0FB7C2              <1> 	movzx	eax, dx
  2880 00012789 D1E0                <1> 	shl	eax, 1 ; word count -> byte count
  2881 0001278B EB3D                <1> 	jmp	short sb16_gdmabo_2	
  2882                              <1> sb16_gdmabo_1:
  2883 0001278D E403                <1> 	in	al, 03h ; DMA channel 1 count register
  2884 0001278F 88C2                <1> 	mov	dl, al	
  2885 00012791 E403                <1> 	in	al, 03h
  2886 00012793 88C6                <1> 	mov     dh, al
  2887 00012795 0FB7C2              <1> 	movzx	eax, dx
  2888 00012798 EB30                <1> 	jmp	short sb16_gdmabo_2
  2889                              <1> 
  2890                              <1> get_dma_buffer_offset:
  2891                              <1> 	; 24/06/2017
  2892                              <1> 	; 22/06/2017
  2893                              <1> 	; get current sound (PCM out) data for graphics
  2894                              <1> 	;
  2895                              <1> 	; ebx = Physical address (on page boundary)
  2896                              <1> 	; ecx = Byte count
  2897                              <1> 	; [audio_buff_size]
  2898                              <1> 
  2899 0001279A 8B0D[646B0100]      <1> 	mov	ecx, [audio_dmabuff_size]
  2900 000127A0 31DB                <1> 	xor	ebx, ebx
  2901                              <1> gdmabo_0:
  2902 000127A2 803D[416B0100]02    <1> 	cmp	byte [audio_device], 2
  2903 000127A9 72CA                <1> 	jb	short sb16_get_dma_buff_off
  2904 000127AB 742A                <1> 	je	short ac97_get_dma_buff_off
  2905                              <1> 
  2906                              <1> vt8233_get_dma_buff_off:
  2907                              <1> 	; 24/06/2017
  2908                              <1> 	; 22/06/2017
  2909                              <1> 	; get current (PCM OUT DMA buffer) pointer
  2910                              <1> 	; (for VT 8233, VT 8237R)
  2911                              <1> 	
  2912                              <1> 	;mov	ecx, [audio_dmabuff_size]
  2913                              <1> 	;xor	ebx, ebx
  2914 000127AD D1E9                <1> 	shr	ecx, 1
  2915                              <1> vt8233_gdmabo_0:
  2916 000127AF BA0C000000          <1> 	mov	edx, VIA_REG_OFFSET_CURR_COUNT
  2917 000127B4 E8FDF4FFFF          <1> 	call	ctrl_io_r32
  2918 000127B9 89C2                <1> 	mov	edx, eax ; remain count (bits 23-0),
  2919                              <1> 			 ; SGD index (bits 31-24) 
  2920 000127BB 81E200000001        <1> 	and	edx, 1000000h ; SGD index (0 = 1st half)
  2921 000127C1 7402                <1> 	jz	short vt8233_gdmabo_1
  2922                              <1> 	; the second half of DMA buffer
  2923 000127C3 89CB                <1> 	mov	ebx, ecx 
  2924                              <1> vt8233_gdmabo_1:	
  2925 000127C5 25FFFFFF00          <1> 	and	eax, 0FFFFFFh ; bits 23-0
  2926                              <1> sb16_gdmabo_2:
  2927                              <1> ac97_gdmabo_2:
  2928 000127CA 29C1                <1> 	sub	ecx, eax
  2929 000127CC 7602                <1> 	jna	short vt8233_gdmabo_2
  2930 000127CE 01CB                <1> 	add	ebx, ecx ; dma buffer offset
  2931                              <1> vt8233_gdmabo_2:
  2932 000127D0 891D[64030300]      <1> 	mov	[u.r0], ebx
  2933 000127D6 C3                  <1> 	retn
  2934                              <1> 
  2935                              <1> ac97_get_dma_buff_off:
  2936                              <1> 	; 24/06/2017
  2937                              <1> 	; 22/06/2017
  2938                              <1> 	; get current (PCM OUT DMA buffer) pointer
  2939                              <1> 	; (for AC'97, ICH)
  2940                              <1> 	; ebx = Physical address (on page boundary)
  2941                              <1> 	; ecx = Byte count
  2942                              <1> 	; [audio_buff_size]
  2943                              <1> 	
  2944                              <1> 	;mov	ecx, [audio_dmabuff_size]
  2945                              <1> 	;xor	ebx, ebx
  2946 000127D7 D1E9                <1> 	shr	ecx, 1
  2947                              <1> ac97_gdmabo_0:
  2948 000127D9 66BA1400            <1> 	mov	dx, PO_CIV_REG ; Position In Current Buff Reg
  2949 000127DD 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2950 000127E4 EC                  <1> 	in	al, dx ; current index value
  2951 000127E5 A801                <1> 	test	al, 1
  2952 000127E7 7402                <1> 	jz	short ac97_gdmabo_1
  2953 000127E9 89CB                <1> 	mov	ebx, ecx
  2954                              <1> ac97_gdmabo_1:
  2955 000127EB 31C0                <1> 	xor	eax, eax
  2956 000127ED 66BA1800            <1> 	mov	dx, PO_PICB_REG ; Position In Current Buff Reg
  2957 000127F1 660315[7A6B0100]    <1> 	add	dx, [NABMBAR]
  2958 000127F8 66ED                <1> 	in	ax, dx ; remain dwords
  2959 000127FA EBCE                <1> 	jmp	short ac97_gdmabo_2
  2642                                  
  2643                                  align 4
  2644                                  
  2645                                  %include 'vgadata.s' ; 04/07/2016
     1                              <1> ; ****************************************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - vgadata.s  (palette and fond data)
     3                              <1> ; -----------------------------------------------------------------------------
     4                              <1> ; Last Update: 04/07/2016
     5                              <1> ; -----------------------------------------------------------------------------
     6                              <1> ; Beginning: 16/01/2016
     7                              <1> ; -----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; -----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Plex86/Bochs VGABios' source code, vgabios-0.7a (2011)
    14                              <1> ; by the LGPL VGABios Developers Team (2001-2008), 'vgatables.h'
    15                              <1> ;
    16                              <1> ; Oracle VirtualBox 5.0.24 VGABios Source Code 
    17                              <1> ; ('vgabios.c', 'vgatables.h', 'vgafonts.h', 'vgarom.asm')
    18                              <1> ;
    19                              <1> ; Palette and font data in assembly language format:
    20                              <1> ; 'VBoxVgaBiosAlternative.asm'
    21                              <1> 
    22                              <1> ; ****************************************************************************************************
    23                              <1> 
    24                              <1> ; 04/07/2016
    25                              <1> ; COLOR DATA
    26                              <1> 
    27                              <1> palette0:
    28 000127FC 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
    28 00012805 00000000000000      <1>
    29 0001280C 00000000000000002A- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    29 00012815 2A2A2A2A2A2A2A      <1>
    30 0001281C 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    30 00012825 2A2A2A2A2A2A2A      <1>
    31 0001282C 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    31 00012835 2A2A2A2A2A2A2A      <1>
    32 0001283C 2A2A2A2A2A2A2A2A3F- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    32 00012845 3F3F3F3F3F3F3F      <1>
    33 0001284C 3F3F3F3F3F3F3F3F3F- <1>     db  03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    33 00012855 3F3F3F3F3F3F3F      <1>
    34 0001285C 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
    34 00012865 00000000000000      <1>
    35 0001286C 00000000000000002A- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    35 00012875 2A2A2A2A2A2A2A      <1>
    36 0001287C 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    36 00012885 2A2A2A2A2A2A2A      <1>
    37 0001288C 2A2A2A2A2A2A2A2A2A- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah
    37 00012895 2A2A2A2A2A2A2A      <1>
    38 0001289C 2A2A2A2A2A2A2A2A3F- <1>     db  02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 02ah, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    38 000128A5 3F3F3F3F3F3F3F      <1>
    39 000128AC 3F3F3F3F3F3F3F3F3F- <1>     db  03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh, 03fh
    39 000128B5 3F3F3F3F3F3F3F      <1>
    40                              <1> palette1:
    41 000128BC 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    41 000128C5 002A2A2A00002A      <1>
    42 000128CC 002A2A15002A2A2A00- <1>     db  000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah
    42 000128D5 000000002A002A      <1>
    43 000128DC 00002A2A2A00002A00- <1>     db  000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah, 000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah
    43 000128E5 2A2A15002A2A2A      <1>
    44 000128EC 15151515153F153F15- <1>     db  015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh, 015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh
    44 000128F5 153F3F3F15153F      <1>
    45 000128FC 153F3F3F153F3F3F15- <1>     db  015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    45 00012905 151515153F153F      <1>
    46 0001290C 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    46 00012915 3F3F3F153F3F3F      <1>
    47 0001291C 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    47 00012925 002A2A2A00002A      <1>
    48 0001292C 002A2A15002A2A2A00- <1>     db  000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah
    48 00012935 000000002A002A      <1>
    49 0001293C 00002A2A2A00002A00- <1>     db  000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah, 000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah
    49 00012945 2A2A15002A2A2A      <1>
    50 0001294C 15151515153F153F15- <1>     db  015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh, 015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh
    50 00012955 153F3F3F15153F      <1>
    51 0001295C 153F3F3F153F3F3F15- <1>     db  015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    51 00012965 151515153F153F      <1>
    52 0001296C 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    52 00012975 3F3F3F153F3F3F      <1>
    53                              <1> palette2:
    54 0001297C 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    54 00012985 002A2A2A00002A      <1>
    55 0001298C 002A2A2A002A2A2A00- <1>     db  000h, 02ah, 02ah, 02ah, 000h, 02ah, 02ah, 02ah, 000h, 000h, 015h, 000h, 000h, 03fh, 000h, 02ah
    55 00012995 001500003F002A      <1>
    56 0001299C 15002A3F2A00152A00- <1>     db  015h, 000h, 02ah, 03fh, 02ah, 000h, 015h, 02ah, 000h, 03fh, 02ah, 02ah, 015h, 02ah, 02ah, 03fh
    56 000129A5 3F2A2A152A2A3F      <1>
    57 000129AC 00150000152A003F00- <1>     db  000h, 015h, 000h, 000h, 015h, 02ah, 000h, 03fh, 000h, 000h, 03fh, 02ah, 02ah, 015h, 000h, 02ah
    57 000129B5 003F2A2A15002A      <1>
    58 000129BC 152A2A3F002A3F2A00- <1>     db  015h, 02ah, 02ah, 03fh, 000h, 02ah, 03fh, 02ah, 000h, 015h, 015h, 000h, 015h, 03fh, 000h, 03fh
    58 000129C5 151500153F003F      <1>
    59 000129CC 15003F3F2A15152A15- <1>     db  015h, 000h, 03fh, 03fh, 02ah, 015h, 015h, 02ah, 015h, 03fh, 02ah, 03fh, 015h, 02ah, 03fh, 03fh
    59 000129D5 3F2A3F152A3F3F      <1>
    60 000129DC 15000015002A152A00- <1>     db  015h, 000h, 000h, 015h, 000h, 02ah, 015h, 02ah, 000h, 015h, 02ah, 02ah, 03fh, 000h, 000h, 03fh
    60 000129E5 152A2A3F00003F      <1>
    61 000129EC 002A3F2A003F2A2A15- <1>     db  000h, 02ah, 03fh, 02ah, 000h, 03fh, 02ah, 02ah, 015h, 000h, 015h, 015h, 000h, 03fh, 015h, 02ah
    61 000129F5 001515003F152A      <1>
    62 000129FC 15152A3F3F00153F00- <1>     db  015h, 015h, 02ah, 03fh, 03fh, 000h, 015h, 03fh, 000h, 03fh, 03fh, 02ah, 015h, 03fh, 02ah, 03fh
    62 00012A05 3F3F2A153F2A3F      <1>
    63 00012A0C 15150015152A153F00- <1>     db  015h, 015h, 000h, 015h, 015h, 02ah, 015h, 03fh, 000h, 015h, 03fh, 02ah, 03fh, 015h, 000h, 03fh
    63 00012A15 153F2A3F15003F      <1>
    64 00012A1C 152A3F3F003F3F2A15- <1>     db  015h, 02ah, 03fh, 03fh, 000h, 03fh, 03fh, 02ah, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    64 00012A25 151515153F153F      <1>
    65 00012A2C 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    65 00012A35 3F3F3F153F3F3F      <1>
    66                              <1> palette3:
    67 00012A3C 00000000002A002A00- <1>     db  000h, 000h, 000h, 000h, 000h, 02ah, 000h, 02ah, 000h, 000h, 02ah, 02ah, 02ah, 000h, 000h, 02ah
    67 00012A45 002A2A2A00002A      <1>
    68 00012A4C 002A2A15002A2A2A15- <1>     db  000h, 02ah, 02ah, 015h, 000h, 02ah, 02ah, 02ah, 015h, 015h, 015h, 015h, 015h, 03fh, 015h, 03fh
    68 00012A55 151515153F153F      <1>
    69 00012A5C 15153F3F3F15153F15- <1>     db  015h, 015h, 03fh, 03fh, 03fh, 015h, 015h, 03fh, 015h, 03fh, 03fh, 03fh, 015h, 03fh, 03fh, 03fh
    69 00012A65 3F3F3F153F3F3F      <1>
    70 00012A6C 000000050505080808- <1>     db  000h, 000h, 000h, 005h, 005h, 005h, 008h, 008h, 008h, 00bh, 00bh, 00bh, 00eh, 00eh, 00eh, 011h
    70 00012A75 0B0B0B0E0E0E11      <1>
    71 00012A7C 11111414141818181C- <1>     db  011h, 011h, 014h, 014h, 014h, 018h, 018h, 018h, 01ch, 01ch, 01ch, 020h, 020h, 020h, 024h, 024h
    71 00012A85 1C1C2020202424      <1>
    72 00012A8C 242828282D2D2D3232- <1>     db  024h, 028h, 028h, 028h, 02dh, 02dh, 02dh, 032h, 032h, 032h, 038h, 038h, 038h, 03fh, 03fh, 03fh
    72 00012A95 323838383F3F3F      <1>
    73 00012A9C 00003F10003F1F003F- <1>     db  000h, 000h, 03fh, 010h, 000h, 03fh, 01fh, 000h, 03fh, 02fh, 000h, 03fh, 03fh, 000h, 03fh, 03fh
    73 00012AA5 2F003F3F003F3F      <1>
    74 00012AAC 002F3F001F3F00103F- <1>     db  000h, 02fh, 03fh, 000h, 01fh, 03fh, 000h, 010h, 03fh, 000h, 000h, 03fh, 010h, 000h, 03fh, 01fh
    74 00012AB5 00003F10003F1F      <1>
    75 00012ABC 003F2F003F3F002F3F- <1>     db  000h, 03fh, 02fh, 000h, 03fh, 03fh, 000h, 02fh, 03fh, 000h, 01fh, 03fh, 000h, 010h, 03fh, 000h
    75 00012AC5 001F3F00103F00      <1>
    76 00012ACC 003F00003F10003F1F- <1>     db  000h, 03fh, 000h, 000h, 03fh, 010h, 000h, 03fh, 01fh, 000h, 03fh, 02fh, 000h, 03fh, 03fh, 000h
    76 00012AD5 003F2F003F3F00      <1>
    77 00012ADC 2F3F001F3F00103F1F- <1>     db  02fh, 03fh, 000h, 01fh, 03fh, 000h, 010h, 03fh, 01fh, 01fh, 03fh, 027h, 01fh, 03fh, 02fh, 01fh
    77 00012AE5 1F3F271F3F2F1F      <1>
    78 00012AEC 3F371F3F3F1F3F3F1F- <1>     db  03fh, 037h, 01fh, 03fh, 03fh, 01fh, 03fh, 03fh, 01fh, 037h, 03fh, 01fh, 02fh, 03fh, 01fh, 027h
    78 00012AF5 373F1F2F3F1F27      <1>
    79 00012AFC 3F1F1F3F271F3F2F1F- <1>     db  03fh, 01fh, 01fh, 03fh, 027h, 01fh, 03fh, 02fh, 01fh, 03fh, 037h, 01fh, 03fh, 03fh, 01fh, 037h
    79 00012B05 3F371F3F3F1F37      <1>
    80 00012B0C 3F1F2F3F1F273F1F1F- <1>     db  03fh, 01fh, 02fh, 03fh, 01fh, 027h, 03fh, 01fh, 01fh, 03fh, 01fh, 01fh, 03fh, 027h, 01fh, 03fh
    80 00012B15 3F1F1F3F271F3F      <1>
    81 00012B1C 2F1F3F371F3F3F1F37- <1>     db  02fh, 01fh, 03fh, 037h, 01fh, 03fh, 03fh, 01fh, 037h, 03fh, 01fh, 02fh, 03fh, 01fh, 027h, 03fh
    81 00012B25 3F1F2F3F1F273F      <1>
    82 00012B2C 2D2D3F312D3F362D3F- <1>     db  02dh, 02dh, 03fh, 031h, 02dh, 03fh, 036h, 02dh, 03fh, 03ah, 02dh, 03fh, 03fh, 02dh, 03fh, 03fh
    82 00012B35 3A2D3F3F2D3F3F      <1>
    83 00012B3C 2D3A3F2D363F2D313F- <1>     db  02dh, 03ah, 03fh, 02dh, 036h, 03fh, 02dh, 031h, 03fh, 02dh, 02dh, 03fh, 031h, 02dh, 03fh, 036h
    83 00012B45 2D2D3F312D3F36      <1>
    84 00012B4C 2D3F3A2D3F3F2D3A3F- <1>     db  02dh, 03fh, 03ah, 02dh, 03fh, 03fh, 02dh, 03ah, 03fh, 02dh, 036h, 03fh, 02dh, 031h, 03fh, 02dh
    84 00012B55 2D363F2D313F2D      <1>
    85 00012B5C 2D3F2D2D3F312D3F36- <1>     db  02dh, 03fh, 02dh, 02dh, 03fh, 031h, 02dh, 03fh, 036h, 02dh, 03fh, 03ah, 02dh, 03fh, 03fh, 02dh
    85 00012B65 2D3F3A2D3F3F2D      <1>
    86 00012B6C 3A3F2D363F2D313F00- <1>     db  03ah, 03fh, 02dh, 036h, 03fh, 02dh, 031h, 03fh, 000h, 000h, 01ch, 007h, 000h, 01ch, 00eh, 000h
    86 00012B75 001C07001C0E00      <1>
    87 00012B7C 1C15001C1C001C1C00- <1>     db  01ch, 015h, 000h, 01ch, 01ch, 000h, 01ch, 01ch, 000h, 015h, 01ch, 000h, 00eh, 01ch, 000h, 007h
    87 00012B85 151C000E1C0007      <1>
    88 00012B8C 1C00001C07001C0E00- <1>     db  01ch, 000h, 000h, 01ch, 007h, 000h, 01ch, 00eh, 000h, 01ch, 015h, 000h, 01ch, 01ch, 000h, 015h
    88 00012B95 1C15001C1C0015      <1>
    89 00012B9C 1C000E1C00071C0000- <1>     db  01ch, 000h, 00eh, 01ch, 000h, 007h, 01ch, 000h, 000h, 01ch, 000h, 000h, 01ch, 007h, 000h, 01ch
    89 00012BA5 1C00001C07001C      <1>
    90 00012BAC 0E001C15001C1C0015- <1>     db  00eh, 000h, 01ch, 015h, 000h, 01ch, 01ch, 000h, 015h, 01ch, 000h, 00eh, 01ch, 000h, 007h, 01ch
    90 00012BB5 1C000E1C00071C      <1>
    91 00012BBC 0E0E1C110E1C150E1C- <1>     db  00eh, 00eh, 01ch, 011h, 00eh, 01ch, 015h, 00eh, 01ch, 018h, 00eh, 01ch, 01ch, 00eh, 01ch, 01ch
    91 00012BC5 180E1C1C0E1C1C      <1>
    92 00012BCC 0E181C0E151C0E111C- <1>     db  00eh, 018h, 01ch, 00eh, 015h, 01ch, 00eh, 011h, 01ch, 00eh, 00eh, 01ch, 011h, 00eh, 01ch, 015h
    92 00012BD5 0E0E1C110E1C15      <1>
    93 00012BDC 0E1C180E1C1C0E181C- <1>     db  00eh, 01ch, 018h, 00eh, 01ch, 01ch, 00eh, 018h, 01ch, 00eh, 015h, 01ch, 00eh, 011h, 01ch, 00eh
    93 00012BE5 0E151C0E111C0E      <1>
    94 00012BEC 0E1C0E0E1C110E1C15- <1>     db  00eh, 01ch, 00eh, 00eh, 01ch, 011h, 00eh, 01ch, 015h, 00eh, 01ch, 018h, 00eh, 01ch, 01ch, 00eh
    94 00012BF5 0E1C180E1C1C0E      <1>
    95 00012BFC 181C0E151C0E111C14- <1>     db  018h, 01ch, 00eh, 015h, 01ch, 00eh, 011h, 01ch, 014h, 014h, 01ch, 016h, 014h, 01ch, 018h, 014h
    95 00012C05 141C16141C1814      <1>
    96 00012C0C 1C1A141C1C141C1C14- <1>     db  01ch, 01ah, 014h, 01ch, 01ch, 014h, 01ch, 01ch, 014h, 01ah, 01ch, 014h, 018h, 01ch, 014h, 016h
    96 00012C15 1A1C14181C1416      <1>
    97 00012C1C 1C14141C16141C1814- <1>     db  01ch, 014h, 014h, 01ch, 016h, 014h, 01ch, 018h, 014h, 01ch, 01ah, 014h, 01ch, 01ch, 014h, 01ah
    97 00012C25 1C1A141C1C141A      <1>
    98 00012C2C 1C14181C14161C1414- <1>     db  01ch, 014h, 018h, 01ch, 014h, 016h, 01ch, 014h, 014h, 01ch, 014h, 014h, 01ch, 016h, 014h, 01ch
    98 00012C35 1C14141C16141C      <1>
    99 00012C3C 18141C1A141C1C141A- <1>     db  018h, 014h, 01ch, 01ah, 014h, 01ch, 01ch, 014h, 01ah, 01ch, 014h, 018h, 01ch, 014h, 016h, 01ch
    99 00012C45 1C14181C14161C      <1>
   100 00012C4C 000010040010080010- <1>     db  000h, 000h, 010h, 004h, 000h, 010h, 008h, 000h, 010h, 00ch, 000h, 010h, 010h, 000h, 010h, 010h
   100 00012C55 0C001010001010      <1>
   101 00012C5C 000C10000810000410- <1>     db  000h, 00ch, 010h, 000h, 008h, 010h, 000h, 004h, 010h, 000h, 000h, 010h, 004h, 000h, 010h, 008h
   101 00012C65 00001004001008      <1>
   102 00012C6C 00100C001010000C10- <1>     db  000h, 010h, 00ch, 000h, 010h, 010h, 000h, 00ch, 010h, 000h, 008h, 010h, 000h, 004h, 010h, 000h
   102 00012C75 00081000041000      <1>
   103 00012C7C 001000001004001008- <1>     db  000h, 010h, 000h, 000h, 010h, 004h, 000h, 010h, 008h, 000h, 010h, 00ch, 000h, 010h, 010h, 000h
   103 00012C85 00100C00101000      <1>
   104 00012C8C 0C1000081000041008- <1>     db  00ch, 010h, 000h, 008h, 010h, 000h, 004h, 010h, 008h, 008h, 010h, 00ah, 008h, 010h, 00ch, 008h
   104 00012C95 08100A08100C08      <1>
   105 00012C9C 100E08101008101008- <1>     db  010h, 00eh, 008h, 010h, 010h, 008h, 010h, 010h, 008h, 00eh, 010h, 008h, 00ch, 010h, 008h, 00ah
   105 00012CA5 0E10080C10080A      <1>
   106 00012CAC 100808100A08100C08- <1>     db  010h, 008h, 008h, 010h, 00ah, 008h, 010h, 00ch, 008h, 010h, 00eh, 008h, 010h, 010h, 008h, 00eh
   106 00012CB5 100E081010080E      <1>
   107 00012CBC 10080C10080A100808- <1>     db  010h, 008h, 00ch, 010h, 008h, 00ah, 010h, 008h, 008h, 010h, 008h, 008h, 010h, 00ah, 008h, 010h
   107 00012CC5 100808100A0810      <1>
   108 00012CCC 0C08100E081010080E- <1>     db  00ch, 008h, 010h, 00eh, 008h, 010h, 010h, 008h, 00eh, 010h, 008h, 00ch, 010h, 008h, 00ah, 010h
   108 00012CD5 10080C10080A10      <1>
   109 00012CDC 0B0B100C0B100D0B10- <1>     db  00bh, 00bh, 010h, 00ch, 00bh, 010h, 00dh, 00bh, 010h, 00fh, 00bh, 010h, 010h, 00bh, 010h, 010h
   109 00012CE5 0F0B10100B1010      <1>
   110 00012CEC 0B0F100B0D100B0C10- <1>     db  00bh, 00fh, 010h, 00bh, 00dh, 010h, 00bh, 00ch, 010h, 00bh, 00bh, 010h, 00ch, 00bh, 010h, 00dh
   110 00012CF5 0B0B100C0B100D      <1>
   111 00012CFC 0B100F0B10100B0F10- <1>     db  00bh, 010h, 00fh, 00bh, 010h, 010h, 00bh, 00fh, 010h, 00bh, 00dh, 010h, 00bh, 00ch, 010h, 00bh
   111 00012D05 0B0D100B0C100B      <1>
   112 00012D0C 0B100B0B100C0B100D- <1>     db  00bh, 010h, 00bh, 00bh, 010h, 00ch, 00bh, 010h, 00dh, 00bh, 010h, 00fh, 00bh, 010h, 010h, 00bh
   112 00012D15 0B100F0B10100B      <1>
   113 00012D1C 0F100B0D100B0C1000- <1>     db  00fh, 010h, 00bh, 00dh, 010h, 00bh, 00ch, 010h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   113 00012D25 00000000000000      <1>
   114 00012D2C 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   114 00012D35 00000000000000      <1>
   115                              <1> 
   116                              <1> 
   117                              <1> ; 04/07/2016
   118                              <1> ; FONT DATA
   119                              <1> 
   120                              <1> CRT_CHAR_GEN:
   121                              <1> vgafont8: 
   122 00012D3C 00000000000000007E- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 07eh, 081h, 0a5h, 081h, 0bdh, 099h, 081h, 07eh
   122 00012D45 81A581BD99817E      <1>
   123 00012D4C 7EFFDBFFC3E7FF7E6C- <1>     db  07eh, 0ffh, 0dbh, 0ffh, 0c3h, 0e7h, 0ffh, 07eh, 06ch, 0feh, 0feh, 0feh, 07ch, 038h, 010h, 000h
   123 00012D55 FEFEFE7C381000      <1>
   124 00012D5C 10387CFE7C38100038- <1>     db  010h, 038h, 07ch, 0feh, 07ch, 038h, 010h, 000h, 038h, 07ch, 038h, 0feh, 0feh, 07ch, 038h, 07ch
   124 00012D65 7C38FEFE7C387C      <1>
   125 00012D6C 1010387CFE7C387C00- <1>     db  010h, 010h, 038h, 07ch, 0feh, 07ch, 038h, 07ch, 000h, 000h, 018h, 03ch, 03ch, 018h, 000h, 000h
   125 00012D75 00183C3C180000      <1>
   126 00012D7C FFFFE7C3C3E7FFFF00- <1>     db  0ffh, 0ffh, 0e7h, 0c3h, 0c3h, 0e7h, 0ffh, 0ffh, 000h, 03ch, 066h, 042h, 042h, 066h, 03ch, 000h
   126 00012D85 3C664242663C00      <1>
   127 00012D8C FFC399BDBD99C3FF0F- <1>     db  0ffh, 0c3h, 099h, 0bdh, 0bdh, 099h, 0c3h, 0ffh, 00fh, 007h, 00fh, 07dh, 0cch, 0cch, 0cch, 078h
   127 00012D95 070F7DCCCCCC78      <1>
   128 00012D9C 3C6666663C187E183F- <1>     db  03ch, 066h, 066h, 066h, 03ch, 018h, 07eh, 018h, 03fh, 033h, 03fh, 030h, 030h, 070h, 0f0h, 0e0h
   128 00012DA5 333F303070F0E0      <1>
   129 00012DAC 7F637F636367E6C099- <1>     db  07fh, 063h, 07fh, 063h, 063h, 067h, 0e6h, 0c0h, 099h, 05ah, 03ch, 0e7h, 0e7h, 03ch, 05ah, 099h
   129 00012DB5 5A3CE7E73C5A99      <1>
   130 00012DBC 80E0F8FEF8E0800002- <1>     db  080h, 0e0h, 0f8h, 0feh, 0f8h, 0e0h, 080h, 000h, 002h, 00eh, 03eh, 0feh, 03eh, 00eh, 002h, 000h
   130 00012DC5 0E3EFE3E0E0200      <1>
   131 00012DCC 183C7E18187E3C1866- <1>     db  018h, 03ch, 07eh, 018h, 018h, 07eh, 03ch, 018h, 066h, 066h, 066h, 066h, 066h, 000h, 066h, 000h
   131 00012DD5 66666666006600      <1>
   132 00012DDC 7FDBDB7B1B1B1B003E- <1>     db  07fh, 0dbh, 0dbh, 07bh, 01bh, 01bh, 01bh, 000h, 03eh, 063h, 038h, 06ch, 06ch, 038h, 0cch, 078h
   132 00012DE5 63386C6C38CC78      <1>
   133 00012DEC 000000007E7E7E0018- <1>     db  000h, 000h, 000h, 000h, 07eh, 07eh, 07eh, 000h, 018h, 03ch, 07eh, 018h, 07eh, 03ch, 018h, 0ffh
   133 00012DF5 3C7E187E3C18FF      <1>
   134 00012DFC 183C7E181818180018- <1>     db  018h, 03ch, 07eh, 018h, 018h, 018h, 018h, 000h, 018h, 018h, 018h, 018h, 07eh, 03ch, 018h, 000h
   134 00012E05 1818187E3C1800      <1>
   135 00012E0C 00180CFE0C18000000- <1>     db  000h, 018h, 00ch, 0feh, 00ch, 018h, 000h, 000h, 000h, 030h, 060h, 0feh, 060h, 030h, 000h, 000h
   135 00012E15 3060FE60300000      <1>
   136 00012E1C 0000C0C0C0FE000000- <1>     db  000h, 000h, 0c0h, 0c0h, 0c0h, 0feh, 000h, 000h, 000h, 024h, 066h, 0ffh, 066h, 024h, 000h, 000h
   136 00012E25 2466FF66240000      <1>
   137 00012E2C 00183C7EFFFF000000- <1>     db  000h, 018h, 03ch, 07eh, 0ffh, 0ffh, 000h, 000h, 000h, 0ffh, 0ffh, 07eh, 03ch, 018h, 000h, 000h
   137 00012E35 FFFF7E3C180000      <1>
   138 00012E3C 000000000000000030- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 030h, 078h, 078h, 030h, 030h, 000h, 030h, 000h
   138 00012E45 78783030003000      <1>
   139 00012E4C 6C6C6C00000000006C- <1>     db  06ch, 06ch, 06ch, 000h, 000h, 000h, 000h, 000h, 06ch, 06ch, 0feh, 06ch, 0feh, 06ch, 06ch, 000h
   139 00012E55 6CFE6CFE6C6C00      <1>
   140 00012E5C 307CC0780CF8300000- <1>     db  030h, 07ch, 0c0h, 078h, 00ch, 0f8h, 030h, 000h, 000h, 0c6h, 0cch, 018h, 030h, 066h, 0c6h, 000h
   140 00012E65 C6CC183066C600      <1>
   141 00012E6C 386C3876DCCC760060- <1>     db  038h, 06ch, 038h, 076h, 0dch, 0cch, 076h, 000h, 060h, 060h, 0c0h, 000h, 000h, 000h, 000h, 000h
   141 00012E75 60C00000000000      <1>
   142 00012E7C 183060606030180060- <1>     db  018h, 030h, 060h, 060h, 060h, 030h, 018h, 000h, 060h, 030h, 018h, 018h, 018h, 030h, 060h, 000h
   142 00012E85 30181818306000      <1>
   143 00012E8C 00663CFF3C66000000- <1>     db  000h, 066h, 03ch, 0ffh, 03ch, 066h, 000h, 000h, 000h, 030h, 030h, 0fch, 030h, 030h, 000h, 000h
   143 00012E95 3030FC30300000      <1>
   144 00012E9C 000000000030306000- <1>     db  000h, 000h, 000h, 000h, 000h, 030h, 030h, 060h, 000h, 000h, 000h, 0fch, 000h, 000h, 000h, 000h
   144 00012EA5 0000FC00000000      <1>
   145 00012EAC 000000000030300006- <1>     db  000h, 000h, 000h, 000h, 000h, 030h, 030h, 000h, 006h, 00ch, 018h, 030h, 060h, 0c0h, 080h, 000h
   145 00012EB5 0C183060C08000      <1>
   146 00012EBC 7CC6CEDEF6E67C0030- <1>     db  07ch, 0c6h, 0ceh, 0deh, 0f6h, 0e6h, 07ch, 000h, 030h, 070h, 030h, 030h, 030h, 030h, 0fch, 000h
   146 00012EC5 7030303030FC00      <1>
   147 00012ECC 78CC0C3860CCFC0078- <1>     db  078h, 0cch, 00ch, 038h, 060h, 0cch, 0fch, 000h, 078h, 0cch, 00ch, 038h, 00ch, 0cch, 078h, 000h
   147 00012ED5 CC0C380CCC7800      <1>
   148 00012EDC 1C3C6CCCFE0C1E00FC- <1>     db  01ch, 03ch, 06ch, 0cch, 0feh, 00ch, 01eh, 000h, 0fch, 0c0h, 0f8h, 00ch, 00ch, 0cch, 078h, 000h
   148 00012EE5 C0F80C0CCC7800      <1>
   149 00012EEC 3860C0F8CCCC7800FC- <1>     db  038h, 060h, 0c0h, 0f8h, 0cch, 0cch, 078h, 000h, 0fch, 0cch, 00ch, 018h, 030h, 030h, 030h, 000h
   149 00012EF5 CC0C1830303000      <1>
   150 00012EFC 78CCCC78CCCC780078- <1>     db  078h, 0cch, 0cch, 078h, 0cch, 0cch, 078h, 000h, 078h, 0cch, 0cch, 07ch, 00ch, 018h, 070h, 000h
   150 00012F05 CCCC7C0C187000      <1>
   151 00012F0C 003030000030300000- <1>     db  000h, 030h, 030h, 000h, 000h, 030h, 030h, 000h, 000h, 030h, 030h, 000h, 000h, 030h, 030h, 060h
   151 00012F15 30300000303060      <1>
   152 00012F1C 183060C06030180000- <1>     db  018h, 030h, 060h, 0c0h, 060h, 030h, 018h, 000h, 000h, 000h, 0fch, 000h, 000h, 0fch, 000h, 000h
   152 00012F25 00FC0000FC0000      <1>
   153 00012F2C 6030180C1830600078- <1>     db  060h, 030h, 018h, 00ch, 018h, 030h, 060h, 000h, 078h, 0cch, 00ch, 018h, 030h, 000h, 030h, 000h
   153 00012F35 CC0C1830003000      <1>
   154 00012F3C 7CC6DEDEDEC0780030- <1>     db  07ch, 0c6h, 0deh, 0deh, 0deh, 0c0h, 078h, 000h, 030h, 078h, 0cch, 0cch, 0fch, 0cch, 0cch, 000h
   154 00012F45 78CCCCFCCCCC00      <1>
   155 00012F4C FC66667C6666FC003C- <1>     db  0fch, 066h, 066h, 07ch, 066h, 066h, 0fch, 000h, 03ch, 066h, 0c0h, 0c0h, 0c0h, 066h, 03ch, 000h
   155 00012F55 66C0C0C0663C00      <1>
   156 00012F5C F86C6666666CF800FE- <1>     db  0f8h, 06ch, 066h, 066h, 066h, 06ch, 0f8h, 000h, 0feh, 062h, 068h, 078h, 068h, 062h, 0feh, 000h
   156 00012F65 6268786862FE00      <1>
   157 00012F6C FE6268786860F0003C- <1>     db  0feh, 062h, 068h, 078h, 068h, 060h, 0f0h, 000h, 03ch, 066h, 0c0h, 0c0h, 0ceh, 066h, 03eh, 000h
   157 00012F75 66C0C0CE663E00      <1>
   158 00012F7C CCCCCCFCCCCCCC0078- <1>     db  0cch, 0cch, 0cch, 0fch, 0cch, 0cch, 0cch, 000h, 078h, 030h, 030h, 030h, 030h, 030h, 078h, 000h
   158 00012F85 30303030307800      <1>
   159 00012F8C 1E0C0C0CCCCC7800E6- <1>     db  01eh, 00ch, 00ch, 00ch, 0cch, 0cch, 078h, 000h, 0e6h, 066h, 06ch, 078h, 06ch, 066h, 0e6h, 000h
   159 00012F95 666C786C66E600      <1>
   160 00012F9C F06060606266FE00C6- <1>     db  0f0h, 060h, 060h, 060h, 062h, 066h, 0feh, 000h, 0c6h, 0eeh, 0feh, 0feh, 0d6h, 0c6h, 0c6h, 000h
   160 00012FA5 EEFEFED6C6C600      <1>
   161 00012FAC C6E6F6DECEC6C60038- <1>     db  0c6h, 0e6h, 0f6h, 0deh, 0ceh, 0c6h, 0c6h, 000h, 038h, 06ch, 0c6h, 0c6h, 0c6h, 06ch, 038h, 000h
   161 00012FB5 6CC6C6C66C3800      <1>
   162 00012FBC FC66667C6060F00078- <1>     db  0fch, 066h, 066h, 07ch, 060h, 060h, 0f0h, 000h, 078h, 0cch, 0cch, 0cch, 0dch, 078h, 01ch, 000h
   162 00012FC5 CCCCCCDC781C00      <1>
   163 00012FCC FC66667C6C66E60078- <1>     db  0fch, 066h, 066h, 07ch, 06ch, 066h, 0e6h, 000h, 078h, 0cch, 0e0h, 070h, 01ch, 0cch, 078h, 000h
   163 00012FD5 CCE0701CCC7800      <1>
   164 00012FDC FCB4303030307800CC- <1>     db  0fch, 0b4h, 030h, 030h, 030h, 030h, 078h, 000h, 0cch, 0cch, 0cch, 0cch, 0cch, 0cch, 0fch, 000h
   164 00012FE5 CCCCCCCCCCFC00      <1>
   165 00012FEC CCCCCCCCCC783000C6- <1>     db  0cch, 0cch, 0cch, 0cch, 0cch, 078h, 030h, 000h, 0c6h, 0c6h, 0c6h, 0d6h, 0feh, 0eeh, 0c6h, 000h
   165 00012FF5 C6C6D6FEEEC600      <1>
   166 00012FFC C6C66C38386CC600CC- <1>     db  0c6h, 0c6h, 06ch, 038h, 038h, 06ch, 0c6h, 000h, 0cch, 0cch, 0cch, 078h, 030h, 030h, 078h, 000h
   166 00013005 CCCC7830307800      <1>
   167 0001300C FEC68C183266FE0078- <1>     db  0feh, 0c6h, 08ch, 018h, 032h, 066h, 0feh, 000h, 078h, 060h, 060h, 060h, 060h, 060h, 078h, 000h
   167 00013015 60606060607800      <1>
   168 0001301C C06030180C06020078- <1>     db  0c0h, 060h, 030h, 018h, 00ch, 006h, 002h, 000h, 078h, 018h, 018h, 018h, 018h, 018h, 078h, 000h
   168 00013025 18181818187800      <1>
   169 0001302C 10386CC60000000000- <1>     db  010h, 038h, 06ch, 0c6h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 0ffh
   169 00013035 000000000000FF      <1>
   170 0001303C 303018000000000000- <1>     db  030h, 030h, 018h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 078h, 00ch, 07ch, 0cch, 076h, 000h
   170 00013045 00780C7CCC7600      <1>
   171 0001304C E060607C6666DC0000- <1>     db  0e0h, 060h, 060h, 07ch, 066h, 066h, 0dch, 000h, 000h, 000h, 078h, 0cch, 0c0h, 0cch, 078h, 000h
   171 00013055 0078CCC0CC7800      <1>
   172 0001305C 1C0C0C7CCCCC760000- <1>     db  01ch, 00ch, 00ch, 07ch, 0cch, 0cch, 076h, 000h, 000h, 000h, 078h, 0cch, 0fch, 0c0h, 078h, 000h
   172 00013065 0078CCFCC07800      <1>
   173 0001306C 386C60F06060F00000- <1>     db  038h, 06ch, 060h, 0f0h, 060h, 060h, 0f0h, 000h, 000h, 000h, 076h, 0cch, 0cch, 07ch, 00ch, 0f8h
   173 00013075 0076CCCC7C0CF8      <1>
   174 0001307C E0606C766666E60030- <1>     db  0e0h, 060h, 06ch, 076h, 066h, 066h, 0e6h, 000h, 030h, 000h, 070h, 030h, 030h, 030h, 078h, 000h
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   218 00013345 181818FF000000      <1>
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   219 00013355 1818181F181818      <1>
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   221 00013375 36363637363636      <1>
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   222 00013385 003F3037363636      <1>
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   224 000133A5 00FF00FF000000      <1>
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   225 000133B5 18FF00FF000000      <1>
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   226 000133C5 00FF00FF181818      <1>
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   227 000133D5 3636363F000000      <1>
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   228 000133E5 001F181F181818      <1>
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   229 000133F5 363636FF363636      <1>
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   230 00013405 181818F8000000      <1>
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   231 00013415 FFFFFFFFFFFFFF      <1>
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   232 00013425 F0F0F0F0F0F0F0      <1>
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   233 00013435 FFFFFF00000000      <1>
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   234 00013445 78CCF8CCF8C0C0      <1>
   235 0001344C 00FCCCC0C0C0C00000- <1>     db  000h, 0fch, 0cch, 0c0h, 0c0h, 0c0h, 0c0h, 000h, 000h, 0feh, 06ch, 06ch, 06ch, 06ch, 06ch, 000h
   235 00013455 FE6C6C6C6C6C00      <1>
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   236 00013465 007ED8D8D87000      <1>
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   237 00013475 76DC1818181800      <1>
   238 0001347C FC3078CCCC7830FC38- <1>     db  0fch, 030h, 078h, 0cch, 0cch, 078h, 030h, 0fch, 038h, 06ch, 0c6h, 0feh, 0c6h, 06ch, 038h, 000h
   238 00013485 6CC6FEC66C3800      <1>
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   239 00013495 30187CCCCC7800      <1>
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   240 000134A5 0C7EDBDB7E60C0      <1>
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   241 000134B5 CCCCCCCCCCCC00      <1>
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   242 000134C5 30FC303000FC00      <1>
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   243 000134D5 3060301800FC00      <1>
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   244 000134E5 18181818D8D870      <1>
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   245 000134F5 76DC0076DC0000      <1>
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   246 00013505 00001818000000      <1>
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   247 00013515 0C0C0CEC6C3C1C      <1>
   248 0001351C 786C6C6C6C00000070- <1>     db  078h, 06ch, 06ch, 06ch, 06ch, 000h, 000h, 000h, 070h, 018h, 030h, 060h, 078h, 000h, 000h, 000h
   248 00013525 18306078000000      <1>
   249 0001352C 00003C3C3C3C000000- <1>     db  000h, 000h, 03ch, 03ch, 03ch, 03ch, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   249 00013535 00000000000000      <1>
   250                              <1> vgafont14:
   251 0001353C 000000000000000000- <1>     db  000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h, 000h
   251 00013545 00000000000000      <1>
   252 0001354C 7E81A58181BD99817E- <1>     db  07eh, 081h, 0a5h, 081h, 081h, 0bdh, 099h, 081h, 07eh, 000h, 000h, 000h, 000h, 000h, 07eh, 0ffh
   252 00013555 00000000007EFF      <1>
   253 0001355C DBFFFFC3E7FF7E0000- <1>     db  0dbh, 0ffh, 0ffh, 0c3h, 0e7h, 0ffh, 07eh, 000h, 000h, 000h, 000h, 000h, 000h, 06ch, 0feh, 0feh
   253 00013565 000000006CFEFE      <1>
   254 0001356C FEFE7C381000000000- <1>     db  0feh, 0feh, 07ch, 038h, 010h, 000h, 000h, 000h, 000h, 000h, 000h, 010h, 038h, 07ch, 0feh, 07ch
   254 00013575 000010387CFE7C      <1>
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   475                              <1> vgafont16:
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   586 00014A25 66666600000000      <1>
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   638 00014D65 C6C67C00000000      <1>
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   644 00014DC5 C6C67C00000000      <1>
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   645 00014DD5 C0C00000000000      <1>
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   647 00014DF5 CE9B060C1F0000      <1>
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   648 00014E05 CE963E06060000      <1>
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   649 00014E15 3C3C1800000000      <1>
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   650 00014E25 36000000000000      <1>
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   652 00014E45 44114411441144      <1>
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   653 00014E55 AA55AA55AA55AA      <1>
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   662 00014EE5 36363636363636      <1>
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   664 00014F05 00000000000000      <1>
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   665 00014F15 00000000000000      <1>
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   750 0001544C 00181818FF18181800- <1>     db  000h, 018h, 018h, 018h, 0ffh, 018h, 018h, 018h, 000h, 0ffh, 000h, 000h, 000h, 0f6h, 000h, 000h
   750 00015455 FF000000F60000      <1>
   751 0001545C 18180000FF00001818- <1>     db  018h, 018h, 000h, 000h, 0ffh, 000h, 000h, 018h, 018h, 000h, 000h, 000h, 000h
   751 00015465 00000000            <1>
   752                              <1> vgafont16alt:
   753 00015469 1D00000000002466FF- <1>     db  01dh, 000h, 000h, 000h, 000h, 000h, 024h, 066h, 0ffh, 066h, 024h, 000h, 000h, 000h, 000h, 000h
   753 00015472 66240000000000      <1>
   754 00015479 003000003C66C3C3DB- <1>     db  000h, 030h, 000h, 000h, 03ch, 066h, 0c3h, 0c3h, 0dbh, 0dbh, 0c3h, 0c3h, 066h, 03ch, 000h, 000h
   754 00015482 DBC3C3663C0000      <1>
   755 00015489 00004D0000C3E7FFFF- <1>     db  000h, 000h, 04dh, 000h, 000h, 0c3h, 0e7h, 0ffh, 0ffh, 0dbh, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 000h
   755 00015492 DBC3C3C3C3C300      <1>
   756 00015499 000000540000FFDB99- <1>     db  000h, 000h, 000h, 054h, 000h, 000h, 0ffh, 0dbh, 099h, 018h, 018h, 018h, 018h, 018h, 018h, 03ch
   756 000154A2 1818181818183C      <1>
   757 000154A9 00000000560000C3C3- <1>     db  000h, 000h, 000h, 000h, 056h, 000h, 000h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 066h, 03ch
   757 000154B2 C3C3C3C3C3663C      <1>
   758 000154B9 1800000000570000C3- <1>     db  018h, 000h, 000h, 000h, 000h, 057h, 000h, 000h, 0c3h, 0c3h, 0c3h, 0c3h, 0c3h, 0dbh, 0dbh, 0ffh
   758 000154C2 C3C3C3C3DBDBFF      <1>
   759 000154C9 666600000000580000- <1>     db  066h, 066h, 000h, 000h, 000h, 000h, 058h, 000h, 000h, 0c3h, 0c3h, 066h, 03ch, 018h, 018h, 03ch
   759 000154D2 C3C3663C18183C      <1>
   760 000154D9 66C3C3000000005900- <1>     db  066h, 0c3h, 0c3h, 000h, 000h, 000h, 000h, 059h, 000h, 000h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h
   760 000154E2 00C3C3C3663C18      <1>
   761 000154E9 1818183C000000005A- <1>     db  018h, 018h, 018h, 03ch, 000h, 000h, 000h, 000h, 05ah, 000h, 000h, 0ffh, 0c3h, 086h, 00ch, 018h
   761 000154F2 0000FFC3860C18      <1>
   762 000154F9 3060C1C3FF00000000- <1>     db  030h, 060h, 0c1h, 0c3h, 0ffh, 000h, 000h, 000h, 000h, 06dh, 000h, 000h, 000h, 000h, 000h, 0e6h
   762 00015502 6D0000000000E6      <1>
   763 00015509 FFDBDBDBDBDB000000- <1>     db  0ffh, 0dbh, 0dbh, 0dbh, 0dbh, 0dbh, 000h, 000h, 000h, 000h, 076h, 000h, 000h, 000h, 000h, 000h
   763 00015512 00760000000000      <1>
   764 00015519 C3C3C3C3663C180000- <1>     db  0c3h, 0c3h, 0c3h, 0c3h, 066h, 03ch, 018h, 000h, 000h, 000h, 000h, 077h, 000h, 000h, 000h, 000h
   764 00015522 00007700000000      <1>
   765 00015529 00C3C3C3DBDBFF6600- <1>     db  000h, 0c3h, 0c3h, 0c3h, 0dbh, 0dbh, 0ffh, 066h, 000h, 000h, 000h, 000h, 078h, 000h, 000h, 000h
   765 00015532 00000078000000      <1>
   766 00015539 0000C3663C183C66C3- <1>     db  000h, 000h, 0c3h, 066h, 03ch, 018h, 03ch, 066h, 0c3h, 000h, 000h, 000h, 000h, 091h, 000h, 000h
   766 00015542 00000000910000      <1>
   767 00015549 0000006E3B1B7ED8DC- <1>     db  000h, 000h, 000h, 06eh, 03bh, 01bh, 07eh, 0d8h, 0dch, 077h, 000h, 000h, 000h, 000h, 09bh, 000h
   767 00015552 77000000009B00      <1>
   768 00015559 18187EC3C0C0C0C37E- <1>     db  018h, 018h, 07eh, 0c3h, 0c0h, 0c0h, 0c0h, 0c3h, 07eh, 018h, 018h, 000h, 000h, 000h, 000h, 09dh
   768 00015562 1818000000009D      <1>
   769 00015569 0000C3663C18FF18FF- <1>     db  000h, 000h, 0c3h, 066h, 03ch, 018h, 0ffh, 018h, 0ffh, 018h, 018h, 018h, 000h, 000h, 000h, 000h
   769 00015572 18181800000000      <1>
   770 00015579 9E00FC66667C62666F- <1>     db  09eh, 000h, 0fch, 066h, 066h, 07ch, 062h, 066h, 06fh, 066h, 066h, 066h, 0f3h, 000h, 000h, 000h
   770 00015582 666666F3000000      <1>
   771 00015589 00AB00C0C0C2C6CC18- <1>     db  000h, 0abh, 000h, 0c0h, 0c0h, 0c2h, 0c6h, 0cch, 018h, 030h, 060h, 0ceh, 09bh, 006h, 00ch, 01fh
   771 00015592 3060CE9B060C1F      <1>
   772 00015599 0000AC00C0C0C2C6CC- <1>     db  000h, 000h, 0ach, 000h, 0c0h, 0c0h, 0c2h, 0c6h, 0cch, 018h, 030h, 066h, 0ceh, 096h, 03eh, 006h
   772 000155A2 183066CE963E06      <1>
   773 000155A9 06000000            <1>     db  006h, 000h, 000h, 000h
  2646                                  
  2647 000155AD 90                      align 2
  2648                                  
  2649                                  ; EPOCH Variables
  2650                                  ; 13/04/2015 - Retro UNIX 386 v1 Beginning
  2651                                  ; 09/04/2013 epoch variables
  2652                                  ; Retro UNIX 8086 v1 Prototype: UNIXCOPY.ASM, 10/03/2013
  2653                                  ;
  2654 000155AE B207                    year: 	dw 1970
  2655 000155B0 0100                    month: 	dw 1
  2656 000155B2 0100                    day: 	dw 1
  2657 000155B4 0000                    hour: 	dw 0
  2658 000155B6 0000                    minute: dw 0
  2659 000155B8 0000                    second: dw 0
  2660                                  
  2661                                  DMonth:
  2662 000155BA 0000                    	dw 0
  2663 000155BC 1F00                    	dw 31
  2664 000155BE 3B00                    	dw 59
  2665 000155C0 5A00                    	dw 90
  2666 000155C2 7800                    	dw 120
  2667 000155C4 9700                    	dw 151
  2668 000155C6 B500                    	dw 181
  2669 000155C8 D400                    	dw 212
  2670 000155CA F300                    	dw 243
  2671 000155CC 1101                    	dw 273
  2672 000155CE 3001                    	dw 304
  2673 000155D0 4E01                    	dw 334
  2674                                  
  2675                                  ; 20/02/2017
  2676                                  KERNELFSIZE  equ $  ; 04/07/2016
  2677                                  
  2678                                  bss_start:
  2679                                  
  2680                                  ABSOLUTE bss_start
  2681                                  
  2682 000155D2 <res 00000006>          alignb 8 ; 25/12/2016
  2683                                  
  2684                                  	; 15/04/2016
  2685                                  	; TRDOS 386 (TRDOS v2.0)
  2686                                  	; 	80 interrupts 	
  2687                                  	; 11/03/2015
  2688                                  	; Interrupt Descriptor Table (20/08/2014)
  2689                                  idt:
  2690                                  	;resb	64*8 ; INT 0 to INT 3Fh
  2691                                  	; 15/04/2016
  2692 000155D8 <res 00000280>          	resb	80*8 ; INT 0 to INT 4Fh
  2693                                  
  2694                                  idt_end:
  2695                                  
  2696                                  ;alignb 4
  2697                                  
  2698                                  task_state_segment:
  2699                                  	; 24/03/2015
  2700 00015858 <res 00000002>          tss.link:   resw 1
  2701 0001585A <res 00000002>          	    resw 1
  2702                                  ; tss offset 4	
  2703 0001585C <res 00000004>          tss.esp0:   resd 1
  2704 00015860 <res 00000002>          tss.ss0:    resw 1
  2705 00015862 <res 00000002>          	    resw 1	
  2706 00015864 <res 00000004>          tss.esp1:   resd 1
  2707 00015868 <res 00000002>          tss.ss1:    resw 1
  2708 0001586A <res 00000002>          	    resw 1 	
  2709 0001586C <res 00000004>          tss.esp2:   resd 1
  2710 00015870 <res 00000002>          tss.ss2:    resw 1
  2711 00015872 <res 00000002>          	    resw 1
  2712                                  ; tss offset 28
  2713 00015874 <res 00000004>          tss.CR3:    resd 1
  2714 00015878 <res 00000004>          tss.eip:    resd 1
  2715 0001587C <res 00000004>          tss.eflags: resd 1
  2716                                  ; tss offset 40
  2717 00015880 <res 00000004>          tss.eax:    resd 1		 		
  2718 00015884 <res 00000004>          tss.ecx:    resd 1
  2719 00015888 <res 00000004>          tss.edx:    resd 1
  2720 0001588C <res 00000004>          tss.ebx:    resd 1
  2721 00015890 <res 00000004>          tss.esp:    resd 1
  2722 00015894 <res 00000004>          tss.ebp:    resd 1
  2723 00015898 <res 00000004>          tss.esi:    resd 1
  2724 0001589C <res 00000004>          tss.edi:    resd 1
  2725                                  ; tss offset 72
  2726 000158A0 <res 00000002>          tss.ES:     resw 1
  2727 000158A2 <res 00000002>          	    resw 1	
  2728 000158A4 <res 00000002>          tss.CS:	    resw 1
  2729 000158A6 <res 00000002>          	    resw 1
  2730 000158A8 <res 00000002>          tss.SS:	    resw 1
  2731 000158AA <res 00000002>          	    resw 1
  2732 000158AC <res 00000002>          tss.DS:	    resw 1
  2733 000158AE <res 00000002>          	    resw 1
  2734 000158B0 <res 00000002>          tss.FS:	    resw 1
  2735 000158B2 <res 00000002>          	    resw 1
  2736 000158B4 <res 00000002>          tss.GS:	    resw 1
  2737 000158B6 <res 00000002>          	    resw 1		
  2738 000158B8 <res 00000002>          tss.LDTR:   resw 1
  2739 000158BA <res 00000002>          	    resw 1
  2740                                  ; tss offset 100		
  2741 000158BC <res 00000002>          	    resw 1		
  2742 000158BE <res 00000002>          tss.IOPB:   resw 1
  2743                                  ; tss offset 104 
  2744                                  tss_end:
  2745                                  
  2746 000158C0 <res 00000004>          k_page_dir:  resd 1 ; Kernel's (System) Page Directory address
  2747                                  		    ; (Physical address = Virtual address)	 	
  2748 000158C4 <res 00000004>          memory_size: resd 1 ; memory size in pages
  2749 000158C8 <res 00000004>          free_pages:  resd 1 ; number of free pages		
  2750 000158CC <res 00000004>          next_page:   resd 1 ; offset value in M.A.T. for
  2751                                  		    ; first free page search
  2752 000158D0 <res 00000004>          last_page:   resd 1 ; offset value in M.A.T. which
  2753                                  		    ; next free page search will be
  2754                                  		    ; stopped after it. (end of M.A.T.)
  2755 000158D4 <res 00000004>          first_page:  resd 1 ; offset value in M.A.T. which
  2756                                  		    ; first free page search
  2757                                  		    ; will be started on it. (for user)
  2758 000158D8 <res 00000004>          mat_size:    resd 1 ; Memory Allocation Table size in pages		
  2759                                  
  2760                                  ; 02/09/2014 (Retro UNIX 386 v1)
  2761                                  ; 04/12/2013 (Retro UNIX 8086 v1)
  2762 000158DC <res 00000002>          CRT_START:   resw 1 	  ; starting address in regen buffer
  2763                                  			  ; NOTE: active page only	
  2764 000158DE <res 00000010>          CURSOR_POSN: resw 8 ; cursor positions for video pages
  2765                                  ACTIVE_PAGE: 
  2766 000158EE <res 00000001>          ptty: 	     resb 1 ; current tty
  2767                                  ; 01/07/2015 - 29/01/2016
  2768 000158EF <res 00000001>          ccolor:	     resb 1 ; current color attribute
  2769                                  ; 26/10/2015
  2770                                  ; 07/09/2014
  2771 000158F0 <res 00000014>          ttychr:      resw ntty+2 ; Character buffer (multiscreen)
  2772                                  
  2773                                  ; 18/05/2015 (03/06/2013 - Retro UNIX 8086 v1 feature only!)
  2774 00015904 <res 00000004>          p_time:      resd 1     ; present time (for systime & sysmdate)
  2775                                  
  2776                                  ; 18/05/2015 (16/08/2013 - Retro UNIX 8086 v1 feature only !)
  2777                                  ; (open mode locks for pseudo TTYs)
  2778                                  ; [ major tty locks (return error in any conflicts) ]
  2779 00015908 <res 00000014>          ttyl:        resw ntty+2 ; opening locks for TTYs.
  2780                                  
  2781                                  ; 15/04/2015 (Retro UNIX 386 v1)
  2782                                  ; 22/09/2013 (Retro UNIX 8086 v1)
  2783 0001591C <res 0000000A>          wlist:       resb ntty+2 ; wait channel list (0 to 9 for TTYs)
  2784                                  ; 15/04/2015 (Retro UNIX 386 v1)
  2785                                  ;; 12/07/2014 -> sp_init set comm. parameters as 0E3h
  2786                                  ;; 0 means serial port is not available 
  2787                                  ;;comprm: ; 25/06/2014
  2788 00015926 <res 00000001>          com1p:       resb 1  ;;0E3h
  2789 00015927 <res 00000001>          com2p:       resb 1  ;;0E3h
  2790                                  
  2791                                  ; 17/11/2015
  2792                                  ; request for response (from the terminal)	
  2793 00015928 <res 00000002>          req_resp:    resw 1 			
  2794                                  ; 07/11/2015
  2795 0001592A <res 00000001>          ccomport:    resb 1 ; current COM (serial) port
  2796                                  		    ; (0= COM1, 1= COM2)
  2797                                  ; 09/11/2015
  2798 0001592B <res 00000001>          comqr:	     resb 1 ; 'query or response' sign (u9.s, 'sndc')
  2799                                  ; 07/11/2015
  2800 0001592C <res 00000002>          rchar:	     resw 1 ; last received char for COM 1 and COM 2		
  2801 0001592E <res 00000002>          schar:	     resw 1 ; last sent char for COM 1 and COM 2
  2802                                  
  2803                                  ; 22/08/2014 (RTC)
  2804                                  ; (Packed BCD)
  2805 00015930 <res 00000001>          time_seconds: resb 1
  2806 00015931 <res 00000001>          time_minutes: resb 1
  2807 00015932 <res 00000001>          time_hours:   resb 1
  2808 00015933 <res 00000001>          date_wday:    resb 1
  2809 00015934 <res 00000001>          date_day:     resb 1
  2810 00015935 <res 00000001>          date_month:   resb 1			
  2811 00015936 <res 00000001>          date_year:    resb 1
  2812 00015937 <res 00000001>          date_century: resb 1
  2813                                  
  2814                                  ; 24/01/2016
  2815 00015938 <res 00000004>          RTC_LH:	       resd 1
  2816 0001593C <res 00000001>          RTC_WAIT_FLAG: resb 1
  2817 0001593D <res 00000001>          USER_FLAG:     resb 1
  2818                                  ; 19/05/2016
  2819                                  ;RTC_second:
  2820 0001593E <res 00000001>          RTC_2Hz:       resb 1 ;  from 2Hz interrupt to 1Hz timer event function	
  2821                                  
  2822                                  %include 'diskbss.s'	; UNINITIALIZED DISK (BIOS) DATA
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel) - v2.0.0 - diskbss.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 24/01/2016
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Turkish Rational DOS
    11                              <1> ; Operating System Project v2.0 by ERDOGAN TAN (Beginning: 04/01/2016)
    12                              <1> ;
    13                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    14                              <1> ; diskbss.inc (10/07/2015)
    15                              <1> ;
    16                              <1> ; Derived from 'IBM PC-XT-286' BIOS source code (1986) 
    17                              <1> ; ****************************************************************************
    18                              <1> 
    19                              <1> ; Retro UNIX 386 v1 Kernel - DISKBSS.INC
    20                              <1> ; Last Modification: 10/07/2015
    21                              <1> ;	(Unnitialized Disk Parameters Data section for 'DISKIO.INC') 
    22                              <1> 
    23 0001593F <res 00000001>      <1> alignb 2
    24                              <1> 
    25                              <1> ;----------------------------------------
    26                              <1> ;	TIMER DATA AREA 		:
    27                              <1> ;----------------------------------------
    28                              <1> 
    29                              <1> TIMER_LH:	; 16/02/205
    30 00015940 <res 00000002>      <1> TIMER_LOW:      resw	1               ; LOW WORD OF TIMER COUNT
    31 00015942 <res 00000002>      <1> TIMER_HIGH:     resw	1               ; HIGH WORD OF TIMER COUNT
    32 00015944 <res 00000001>      <1> TIMER_OFL:      resb 	1               ; TIMER HAS ROLLED OVER SINCE LAST READ
    33                              <1> 
    34                              <1> ;----------------------------------------
    35                              <1> ;	DISKETTE DATA AREAS		:
    36                              <1> ;----------------------------------------
    37                              <1> 
    38 00015945 <res 00000001>      <1> SEEK_STATUS:	resb	1
    39 00015946 <res 00000001>      <1> MOTOR_STATUS:	resb	1
    40 00015947 <res 00000001>      <1> MOTOR_COUNT:	resb	1
    41 00015948 <res 00000001>      <1> DSKETTE_STATUS:	resb	1
    42 00015949 <res 00000007>      <1> NEC_STATUS:	resb	7
    43                              <1> 
    44                              <1> ;----------------------------------------
    45                              <1> ;	ADDITIONAL MEDIA DATA		:
    46                              <1> ;----------------------------------------
    47                              <1> 
    48 00015950 <res 00000001>      <1> LASTRATE:	resb 	1
    49 00015951 <res 00000001>      <1> HF_STATUS:	resb 	1
    50 00015952 <res 00000001>      <1> HF_ERROR:	resb 	1
    51 00015953 <res 00000001>      <1> HF_INT_FLAG:	resb 	1
    52 00015954 <res 00000001>      <1> HF_CNTRL:	resb 	1
    53 00015955 <res 00000004>      <1> DSK_STATE:	resb 	4
    54 00015959 <res 00000002>      <1> DSK_TRK:	resb 	2
    55                              <1> 
    56                              <1> ;----------------------------------------
    57                              <1> ;	FIXED DISK DATA AREAS		:
    58                              <1> ;----------------------------------------
    59                              <1> 
    60 0001595B <res 00000001>      <1> DISK_STATUS1:	resb 	1		; FIXED DISK STATUS
    61 0001595C <res 00000001>      <1> HF_NUM:		resb 	1		; COUNT OF FIXED DISK DRIVES
    62 0001595D <res 00000001>      <1> CONTROL_BYTE:	resb 	1		; HEAD CONTROL BYTE
    63                              <1> ;@PORT_OFF	resb	1		; RESERVED (PORT OFFSET)
    64                              <1> ;port1_off	resb	1		; Hard disk controller 1 - port offset
    65                              <1> ;port2_off	resb	1		; Hard idsk controller 2 - port offset
    66                              <1> 
    67 0001595E <res 00000002>      <1> alignb 4
    68                              <1> 
    69                              <1> ;HF_TBL_VEC:	resd	1 		; Primary master disk param. tbl. pointer
    70                              <1> ;HF1_TBL_VEC:	resd	1		; Primary slave disk param. tbl. pointer
    71                              <1> HF_TBL_VEC: ; 22/12/2014	
    72 00015960 <res 00000004>      <1> HDPM_TBL_VEC:	resd	1 		; Primary master disk param. tbl. pointer
    73 00015964 <res 00000004>      <1> HDPS_TBL_VEC:	resd	1		; Primary slave disk param. tbl. pointer
    74 00015968 <res 00000004>      <1> HDSM_TBL_VEC:	resd	1 		; Secondary master disk param. tbl. pointer
    75 0001596C <res 00000004>      <1> HDSS_TBL_VEC:	resd	1		; Secondary slave disk param. tbl. pointer
    76                              <1> 
    77                              <1> ; 03/01/2015
    78 00015970 <res 00000001>      <1> LBAMode:     	resb	1
    79                              <1> 
    80                              <1> ; *****************************************************************************
  2823                                  
  2824                                  ;;; Real Mode Data (10/07/2015 - BSS)
  2825                                  
  2826                                  ;alignb 2
  2827                                  
  2828                                  ; 10/01/2016
  2829                                  %include 'trdoskx.s'	; UNINITIALIZED KERNEL (Logical Drive & FS) DATA
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.2) - UNINITIALIZED DATA : trdoskx.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 30/08/2020
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 04/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from TRDOS Operating System v1.0 (8086) source code by Erdogan Tan
    11                              <1> ; TRDOS2.ASM (09/11/2011)
    12                              <1> ; ****************************************************************************
    13                              <1> ; DRV_INIT.ASM [26/09/2009] Last Update: 07/08/2011
    14                              <1> ; MAINPROG.ASM [17/01/2004] Last Update: 09/11/2011
    15                              <1> ; DIR.ASM      [17/01/2004] Last Update: 09/10/2011
    16                              <1> ; CMD_INTR.ASM [29/01/2005] Last update: 09/11/2011
    17                              <1> ; DRV_FAT.ASM  [07/07/2009] Last update: 21/08/2011
    18                              <1> 
    19 00015971 <res 00000003>      <1> alignb 4
    20                              <1> 
    21                              <1> ; MAINPROG.ASM
    22 00015974 <res 00000004>      <1> MainProgCfg_FileSize:   resd 1 ; 14/04/2016
    23 00015978 <res 00000004>      <1> MainProgCfg_LineOffset: resd 1 ; 14/04/2016
    24                              <1> 
    25 0001597C <res 00000004>      <1> Current_VolSerial: resd 1
    26                              <1> 
    27 00015980 <res 00000004>      <1> Current_Dir_FCluster: resd 1
    28                              <1> 
    29 00015984 <res 00000001>      <1> Current_Dir_Level: resb 1
    30 00015985 <res 00000001>      <1> Current_FATType: resb 1
    31 00015986 <res 00000001>      <1> Current_Drv: resb 1
    32 00015987 <res 00000001>      <1> Current_Dir_Drv:   resb 1 ; '?'
    33 00015988 <res 00000001>      <1>                    resb 1 ; ':'
    34 00015989 <res 00000001>      <1> Current_Dir_Root:  resb 1 ; '/' 
    35 0001598A <res 0000005A>      <1> Current_Directory: resb 90
    36 000159E4 <res 00000001>      <1> End_Of_Current_Dir_Str: resb 1
    37 000159E5 <res 00000001>      <1> Current_Dir_StrLen: resb 1   
    38                              <1> 
    39 000159E6 <res 00000001>      <1> CursorColumn: 	resb 1
    40 000159E7 <res 00000001>      <1> CmdArgStart:    resb 1
    41                              <1> 
    42                              <1> ; 03/02/2016
    43 000159E8 <res 0000004E>      <1> Remark:		resb 78
    44                              <1> 
    45 00015A36 <res 00000050>      <1> CommandBuffer: 	resb 80
    46                              <1> 
    47 00015A86 <res 00000100>      <1> TextBuffer:	resb 256
    48                              <1> 
    49                              <1> MasterBootBuff:
    50 00015B86 <res 000001BE>      <1> MasterBootCode: resb 1BEh
    51 00015D44 <res 00000040>      <1> PartitionTable: resb 64
    52 00015D84 <res 00000002>      <1> MBIDCode: resw 1
    53                              <1> 
    54                              <1> PTable_Buffer:
    55 00015D86 <res 00000040>      <1> PTable_hd0: resb 64
    56 00015DC6 <res 00000040>      <1> PTable_hd1: resb 64
    57 00015E06 <res 00000040>      <1> PTable_hd2: resb 64
    58 00015E46 <res 00000040>      <1> PTable_hd3: resb 64
    59                              <1> ; 15/07/2020
    60                              <1> ;PTable_ep0: resb 64
    61                              <1> ;PTable_ep1: resb 64
    62                              <1> ;PTable_ep2: resb 64
    63                              <1> ;PTable_ep3: resb 64
    64                              <1> 
    65                              <1> ; 13/08/2020
    66 00015E86 <res 00000001>      <1> scount: resb 1 ; 16/05/2016 (diskio.s, 'int33h:')
    67 00015E87 <res 00000001>      <1> 	resb 1
    68 00015E88 <res 00000001>      <1> 	resb 1
    69 00015E89 <res 00000001>      <1> 	resb 1
    70                              <1> 	
    71 00015E8A <res 00000001>      <1> HD_LBA_yes: resb 1
    72 00015E8B <res 00000001>      <1> PP_Counter: resb 1
    73 00015E8C <res 00000001>      <1> EP_Counter: resb 1
    74                              <1> ; 13/08/2020
    75 00015E8D <res 00000001>      <1> LD_Counter: resb 1
    76                              <1> 
    77                              <1> ; 30/08/2020
    78 00015E8E <res 00000004>      <1> MBR_EP_StartSector: resd 1 
    79                              <1> 		; Extd partition start sector as in MBR
    80 00015E92 <res 00000004>      <1> EP_StartSector: resd 1 ; next extd partition start sector
    81                              <1> 	; 15/07/2020	
    82                              <1>                 ;resd 1
    83                              <1>                 ;resd 1
    84                              <1> 
    85                              <1> ; 20/07/2020
    86 00015E96 <res 00000200>      <1> DOSBootSectorBuff: resb 512
    87                              <1> ; 15/07/2020
    88                              <1> ;DOSBootSectorBuff: resb 446 ; 1BEh
    89                              <1> ;MiniPartitionTable: resb 64 ;  40h
    90                              <1> ;MiniPartitionMagic: resw  1 ;  02h 		
    91                              <1> 
    92                              <1> FAT_BuffDescriptor:
    93 00016096 <res 00000004>      <1> FAT_CurrentCluster: resd 1
    94 0001609A <res 00000001>      <1> FAT_BuffValidData: resb 1
    95 0001609B <res 00000001>      <1> FAT_BuffDrvName: resb 1
    96 0001609C <res 00000002>      <1> FAT_BuffOffset: resw 1
    97 0001609E <res 00000004>      <1> FAT_BuffSector: resd 1
    98                              <1> 
    99 000160A2 <res 00000004>      <1> FAT_ClusterCounter: resd 1
   100 000160A6 <res 00000004>      <1> LastCluster: resd 1
   101                              <1> 
   102                              <1> ; 16/05/2016
   103                              <1> ;; 18/03/2016 (TRDOS v2.0)
   104                              <1> ;ClusterBuffer_Valid: resb 1
   105                              <1> 
   106                              <1> Dir_BuffDescriptor:
   107 000160AA <res 00000001>      <1> DirBuff_DRV: resb 1
   108 000160AB <res 00000001>      <1> DirBuff_FATType: resb 1
   109 000160AC <res 00000001>      <1> DirBuff_ValidData: resb 1
   110 000160AD <res 00000002>      <1> DirBuff_CurrentEntry: resw 1
   111 000160AF <res 00000002>      <1> DirBuff_LastEntry: resw 1
   112 000160B1 <res 00000004>      <1> DirBuff_Cluster: resd 1 
   113 000160B5 <res 00000002>      <1> DirBuffer_Size: resw 1
   114                              <1> ;DirBuff_EntryCounter: resw 1
   115                              <1> 
   116                              <1> ; 01/02/2016
   117                              <1> ; these are on (real mode) segment 8000h and later
   118                              <1> ; FAT_Buffer:	resb 1536 ; 3 sectors
   119                              <1> ; Dir_Buffer:	resb 512*32
   120                              <1> ; Logical_DOSDisks:  resb 6656 ; 26 * 256 bytes
   121                              <1> 
   122                              <1> ; 18/01/2016
   123                              <1> 
   124 000160B7 <res 00000004>      <1> FreeClusterCount: resd 1
   125                              <1> 
   126 000160BB <res 00000004>      <1> VolSize_Unit1:   resd 1
   127 000160BF <res 00000004>      <1> VolSize_Unit2:   resd 1
   128                              <1> 
   129 000160C3 <res 00000004>      <1> Vol_Tot_Sec_Str_Start:	    resd 1
   130 000160C7 <res 0000000A>      <1> Vol_Tot_Sec_Str: 	    resb 10
   131 000160D1 <res 00000001>      <1> Vol_Tot_Sec_Str_End:	    resb 1
   132 000160D2 <res 00000001>      <1> resb 1
   133 000160D3 <res 00000004>      <1> Vol_Free_Sectors_Str_Start: resd 1
   134 000160D7 <res 0000000A>      <1> Vol_Free_Sectors_Str:	    resb 10				
   135 000160E1 <res 00000001>      <1> Vol_Free_Sectors_Str_End:   resb 1
   136                              <1> 
   137                              <1> ; 10/02/2016
   138 000160E2 <res 00000001>      <1> RUN_CDRV: resb 1 ; CMD_INTR.ASM  ; 09/11/2011
   139                              <1> 
   140                              <1> ; 24/01/2016
   141 000160E3 <res 00000080>      <1> PATH_Array:     resb 128 ; DIR.ASM ; 09/10/2011
   142                              <1> ; 06/02/2016
   143 00016163 <res 00000004>      <1> CCD_DriveDT:	resd 1 ; DIR.ASM ; (word)
   144 00016167 <res 00000001>      <1> CCD_Level:	resb 1 ; DIR.ASM
   145 00016168 <res 00000001>      <1> Last_Dir_Level:	resb 1 ; DIR.ASM
   146                              <1> ;
   147 00016169 <res 00000002>      <1> CDLF_AttributesMask: resw 1 ; DIR.ASM
   148 0001616B <res 00000004>      <1> CDLF_FNAddress:	resd 1 ; DIR.ASM (word)
   149 0001616F <res 00000002>      <1> CDLF_DEType:	resw 1 ; DIR.ASM
   150                              <1> ;
   151 00016171 <res 00000001>      <1> CD_COMMAND:	resb 1 ; DIR.ASM
   152                              <1> 
   153 00016172 <res 00000002>      <1> alignb 4
   154                              <1> 
   155                              <1> ; 29/01/2016
   156 00016174 <res 00000001>      <1> Program_Exit:	resb 1 ; CMD_INTR.ASM  ; 09/11/2011
   157                              <1> 
   158                              <1> ;alignb 4
   159                              <1> ; 23/02/2016
   160 00016175 <res 00000001>      <1> disk_rw_op:	resb 1 ;  0 = disk read, 1 = disk write
   161                              <1> ;disk_rw_spt:	resb 1 ; sectors per track (<= 63) /// (<256)
   162                              <1> ; 31/01/2016
   163 00016176 <res 00000001>      <1> retry_count: 	resb 1 ; DISK_IO.ASM ; 20/07/2011 (CHS_RetryCount)
   164 00016177 <res 00000001>      <1> disk_rw_err: 	resb 1 ; DISK_IO.ASM ; (Disk_IO_err_code)
   165 00016178 <res 00000004>      <1> sector_count:	resd 1 ; DISK_IO.ASM ; (Disk_RW_SectorCount)
   166                              <1> 
   167                              <1> ; 06/02/2016 (long name)
   168 0001617C <res 00000002>      <1> FDE_AttrMask:	   resw 1 ; DIR.ASM
   169 0001617E <res 00000002>      <1> AmbiguousFileName: resw 1 ; DIR.ASM
   170 00016180 <res 00000001>      <1> PreviousAttr:	   resb 1 ; DIR.ASM
   171                              <1> ;	
   172 00016181 <res 00000001>      <1> LongNameFound:   resb 1	  ; DIR.ASM
   173 00016182 <res 00000001>      <1> LFN_EntryLength: resb 1   ; DIR.ASM
   174 00016183 <res 00000001>      <1> LFN_CheckSum:    resb 1   ; DIR.ASM
   175 00016184 <res 00000084>      <1> LongFileName:    resb 132 ; DIR.ASM
   176                              <1> 
   177                              <1> ;PATH_Array_Ptr: resw 1 ; DIR.ASM
   178 00016208 <res 00000001>      <1> PATH_CDLevel:	 resb 1 ; DIR.ASM
   179 00016209 <res 00000001>      <1> PATH_Level:	 resb 1 ; DIR.ASM
   180                              <1> 
   181                              <1> ; 07/02/2016
   182 0001620A <res 0000000D>      <1> Dir_File_Name:	resb 13 ; DIR.ASM ; 09/10/2011
   183                              <1> 
   184                              <1> ; 10/02/2016
   185 00016217 <res 0000000D>      <1> Dir_Entry_Name:	resb 13 ; DIR.ASM
   186                              <1> 
   187                              <1> alignb 2
   188                              <1> 
   189 00016224 <res 00000002>      <1> AttributesMask: resw 1 ; CMD_INTR.ASM ; 09/11/2011
   190                              <1> 
   191                              <1> ; 10/02/2016 (128 bytes -> 126 bytes)
   192                              <1> ; 08/02/2016
   193                              <1> ;FFF Structure (128 bytes) ; DIR.ASM ; 09/10/2011
   194 00016226 <res 00000001>      <1> FindFile_Drv:		  resb 1
   195 00016227 <res 00000041>      <1> FindFile_Directory:	  resb 65
   196 00016268 <res 0000000D>      <1> FindFile_Name:		  resb 13
   197                              <1> FindFile_LongNameEntryLength:
   198 00016275 <res 00000001>      <1> FindFile_LongNameYes: 	  resb 1 ; Sign for longname procedures
   199                              <1> ;Above 80 bytes form
   200                              <1> ;TR-DOS Source/Destination File FullName Format/Structure
   201 00016276 <res 00000002>      <1> FindFile_AttributesMask:  resw 1
   202 00016278 <res 00000020>      <1> FindFile_DirEntry:	  resb 32
   203 00016298 <res 00000004>      <1> FindFile_DirFirstCluster: resd 1
   204 0001629C <res 00000004>      <1> FindFile_DirCluster:	  resd 1
   205 000162A0 <res 00000002>      <1> FindFile_DirEntryNumber:  resw 1
   206 000162A2 <res 00000002>      <1> FindFile_MatchCounter:	  resw 1
   207 000162A4 <res 00000002>      <1> FindFile_Reserved:	  resw 1 ; 06/03/2016
   208                              <1> 
   209 000162A6 <res 00000004>      <1> First_Path_Pos: resd 1	; DIR.ASM ; 09/10/2011
   210 000162AA <res 00000004>      <1> Last_Slash_Pos: resd 1	; DIR.ASM 
   211                              <1> 
   212                              <1> ; 10/02/2016
   213 000162AE <res 00000002>      <1> File_Count:     resw 1 	; DIR.ASM ; 09/10/2011
   214 000162B0 <res 00000002>      <1> Dir_Count:      resw 1
   215 000162B2 <res 00000004>      <1> Total_FSize:    resd 1
   216 000162B6 <res 00000004>      <1> TFS_Dec_Begin:  resd 1
   217 000162BA <res 0000000A>      <1>                 resb 10
   218 000162C4 <res 00000001>      <1> TFS_Dec_End:    resb 1
   219                              <1> 
   220 000162C5 <res 00000001>      <1> PrintDir_RowCounter: resb 1
   221                              <1> 
   222 000162C6 <res 00000002>      <1> alignb 4
   223                              <1> ; 15/02/2015 ('show' command variables)
   224 000162C8 <res 00000004>      <1> Show_FDT:	resd 1
   225 000162CC <res 00000004>      <1> Show_LDDDT:	resd 1
   226 000162D0 <res 00000004>      <1> Show_Cluster:	resd 1
   227 000162D4 <res 00000004>      <1> Show_FileSize:	resd 1
   228 000162D8 <res 00000004>      <1> Show_FilePointer: resd 1
   229 000162DC <res 00000002>      <1> Show_ClusterPointer: resw 1
   230 000162DE <res 00000002>      <1> Show_ClusterSize: resw 1
   231 000162E0 <res 00000001>      <1> Show_RowCount:	resb 1
   232                              <1> 
   233 000162E1 <res 00000003>      <1> alignb 4
   234                              <1> ; 21/02/2016
   235 000162E4 <res 00000004>      <1> DelFile_FNPointer:	resd 1 ; ; CMD_INTR.ASM (word) ; 09/11/2011
   236                              <1> ; 27/02/2016
   237                              <1> ; DIR.ASM (09/10/2011)
   238 000162E8 <res 00000004>      <1> DelFile_FCluster:	resd 1
   239 000162EC <res 00000002>      <1> DelFile_EntryCounter:	resw 1
   240 000162EE <res 00000001>      <1> DelFile_LNEL:		resb 1
   241 000162EF <res 00000001>      <1> resb 1
   242                              <1> 
   243                              <1> ; DIR.ASM
   244 000162F0 <res 00000004>      <1> mkdir_DirName_Offset: 	resd 1
   245 000162F4 <res 00000004>      <1> mkdir_FFCluster:	resd 1
   246 000162F8 <res 00000004>      <1> mkdir_LastDirCluster:	resd 1
   247 000162FC <res 00000004>      <1> mkdir_FreeSectors:	resd 1
   248 00016300 <res 00000002>      <1> mkdir_attrib:		resw 1 
   249 00016302 <res 00000001>      <1> mkdir_SecPerClust:	resb 1
   250 00016303 <res 00000001>      <1> mkdir_add_new_cluster:	resb 1
   251 00016304 <res 0000000D>      <1> mkdir_Name:		resb 13
   252 00016311 <res 00000002>      <1> resw 1 ; 01/03/2016
   253                              <1> ; 27/02/2016
   254 00016313 <res 00000001>      <1> RmDir_MultiClusters:	resb 1  
   255 00016314 <res 00000004>      <1> RmDir_DirEntryOffset:	resd 1 ; 01/03/2016 (word -> dword)
   256 00016318 <res 00000004>      <1> RmDir_ParentDirCluster: resd 1
   257 0001631C <res 00000004>      <1> RmDir_DirLastCluster:   resd 1
   258 00016320 <res 00000004>      <1> RmDir_PreviousCluster:  resd 1
   259                              <1> ; 22/02/2016
   260 00016324 <res 00000001>      <1> UPDLMDT_CDirLevel:	resb 1
   261 00016325 <res 00000004>      <1> UPDLMDT_CDirFCluster:	resd 1
   262                              <1> 	
   263 00016329 <res 00000003>      <1> alignb 4
   264                              <1> ; DRV_FAT.ASM ; 21/08/2011
   265 0001632C <res 00000004>      <1> gffc_next_free_cluster:  resd 1
   266 00016330 <res 00000004>      <1> gffc_first_free_cluster: resd 1
   267 00016334 <res 00000004>      <1> gffc_last_free_cluster:  resd 1
   268                              <1> 
   269                              <1> ;29/04/2016
   270                              <1> Cluster_Index: ; resd 1
   271                              <1> ; 22/02/2016
   272 00016338 <res 00000004>      <1> ClusterValue:	resd 1
   273                              <1> ; 04/03/2016
   274 0001633C <res 00000001>      <1> Attributes:	resb 1 
   275                              <1> ;;CFS_error:  resb 1 ;; 01/03/2016
   276 0001633D <res 00000001>      <1> resb 1
   277 0001633E <res 00000001>      <1> CFS_OPType: resb 1
   278 0001633F <res 00000001>      <1> CFS_Drv:    resb 1
   279 00016340 <res 00000004>      <1> CFS_CC:	    resd 1
   280 00016344 <res 00000004>      <1> CFS_FAT32FSINFOSEC: resd 1
   281 00016348 <res 00000004>      <1> CFS_FAT32FC: resd 1
   282                              <1> 
   283                              <1> ; 27/02/2016
   284                              <1> ;alignb 4
   285 0001634C <res 00000004>      <1> glc_prevcluster: resd 1 ; DRV_FAT.ASM (21/08/2011)
   286                              <1> ; 22/10/2016
   287 00016350 <res 00000004>      <1> glc_index:	 resd 1 ;  Last Cluster Index (22/10/2016)	
   288                              <1> 
   289                              <1> ; DIR.ASM
   290 00016354 <res 00000002>      <1> DLN_EntryNumber: resw 1
   291 00016356 <res 00000001>      <1> DLN_40h:	 resb 1
   292                              <1> ; 28/02/2016
   293 00016357 <res 00000001>      <1> TCC_FATErr:	 resb 1 ; DRV_FAT.ASM
   294                              <1> 
   295                              <1> alignb 4
   296                              <1> ; DIR.ASM (09/10/2011)
   297 00016358 <res 00000002>      <1> LCDE_EntryIndex: resw 1 ; LCDE_EntryOffset
   298 0001635A <res 00000002>      <1> LCDE_ClusterSN:  resw 1
   299 0001635C <res 00000004>      <1> LCDE_Cluster: 	 resd 1
   300 00016360 <res 00000004>      <1> LCDE_ByteOffset: resd 1
   301                              <1> 
   302                              <1> ;alignb4
   303                              <1> ; 06/03/2016 (word -> dword)
   304                              <1> ; CMD_INTR.ASM (01/08/2010)
   305 00016364 <res 00000004>      <1> SourceFilePath:	     resd 1
   306 00016368 <res 00000004>      <1> DestinationFilePath: resd 1
   307                              <1> 
   308                              <1> ;alignb 4
   309                              <1> ; 06/03/2016
   310                              <1> ; FILE.ASM (09/10/2011)
   311                              <1> ;Source File Structure (same with 'Find File' Structure)
   312 0001636C <res 00000001>      <1> SourceFile_Drv:			resb 1
   313 0001636D <res 00000041>      <1> SourceFile_Directory:		resb 65
   314 000163AE <res 0000000D>      <1> SourceFile_Name:		resb 13
   315                              <1> SourceFile_LongNameEntryLength: 
   316 000163BB <res 00000001>      <1> SourceFile_LongNameYes:		resb 1 ; Sign for longname procedures
   317                              <1> ;Above 80 bytes
   318                              <1> ;is TR-DOS Source File FullName Format/Structure
   319 000163BC <res 00000002>      <1> SourceFile_AttributesMask:	resw 1
   320 000163BE <res 00000020>      <1> SourceFile_DirEntry:		resb 32
   321 000163DE <res 00000004>      <1> SourceFile_DirFirstCluster:	resd 1
   322 000163E2 <res 00000004>      <1> SourceFile_DirCluster:		resd 1
   323 000163E6 <res 00000002>      <1> SourceFile_DirEntryNumber:	resw 1
   324 000163E8 <res 00000002>      <1> SourceFile_MatchCounter:	resw 1
   325                              <1> ; 16/03/2016
   326 000163EA <res 00000001>      <1> SourceFile_SecPerClust:		resb 1
   327 000163EB <res 00000001>      <1> SourceFile_Reserved:		resb 1
   328                              <1> ; Above is 128 bytes
   329                              <1> 
   330                              <1> ;Destination File Structure (same with 'Find File' Structure)
   331 000163EC <res 00000001>      <1> DestinationFile_Drv:		resb 1
   332 000163ED <res 00000041>      <1> DestinationFile_Directory: 	resb 65
   333 0001642E <res 0000000D>      <1> DestinationFile_Name:		resb 13
   334                              <1> DestinationFile_LongNameEntryLength:
   335 0001643B <res 00000001>      <1> DestinationFile_LongNameYes:	resb 1 ; Sign for longname procedures
   336                              <1> ;Above 80 bytes
   337                              <1> ;is TR-DOS Destination File FullName Format/Structure
   338 0001643C <res 00000002>      <1> DestinationFile_AttributesMask: resw 1
   339 0001643E <res 00000020>      <1> DestinationFile_DirEntry:	resb 32
   340 0001645E <res 00000004>      <1> DestinationFile_DirFirstCluster: resd 1
   341 00016462 <res 00000004>      <1> DestinationFile_DirCluster:	resd 1
   342 00016466 <res 00000002>      <1> DestinationFile_DirEntryNumber: resw 1
   343 00016468 <res 00000002>      <1> DestinationFile_MatchCounter:	resw 1
   344                              <1> ; 16/03/2016
   345 0001646A <res 00000001>      <1> DestinationFile_SecPerClust:	resb 1
   346 0001646B <res 00000001>      <1> DestinationFile_Reserved:	resb 1
   347                              <1> ; Above is 128 bytes
   348                              <1> 
   349                              <1> ; 24/04/2016
   350 0001646C <res 00000002>      <1> resw 1
   351                              <1> 
   352                              <1> ; 10/03/2016
   353                              <1> ; FILE.ASM
   354 0001646E <res 00000001>      <1> move_cmd_phase:	   resb 1
   355 0001646F <res 00000001>      <1> msftdf_sf_df_drv:  resb 1
   356 00016470 <res 00000004>      <1> msftdf_drv_offset: resd 1
   357                              <1> 
   358                              <1> ; 11/03/2016
   359                              <1> ; DRV_FAT.ASM (21/08/2011)
   360 00016474 <res 00000004>      <1> FAT_anc_LCluster:  resd 1
   361 00016478 <res 00000004>      <1> FAT_anc_FFCluster: resd 1
   362                              <1> 
   363                              <1> ;alignb 4
   364                              <1> 
   365                              <1> ; 14/03/2016
   366                              <1> ; TRDOS 386 = TRDOS v2.0 feature only !
   367                              <1> ; 'allocate_memory_block' in 'memory.s'
   368 0001647C <res 00000004>      <1> mem_ipg_count:	resd 1 ; page count (for contiguous allocation)
   369 00016480 <res 00000004>      <1> mem_pg_count:	resd 1 ; page count (for count down)
   370 00016484 <res 00000004>      <1> mem_aperture:	resd 1 ; contiguous free pages (current)
   371 00016488 <res 00000004>      <1> mem_max_aperture: resd 1 ; maximum value of contiguous free pages
   372 0001648C <res 00000004>      <1> mem_pg_pos:	resd 1 ; mem. position (page #) of current aperture
   373 00016490 <res 00000004>      <1> mem_max_pg_pos: resd 1 ; mem. position (page #) of max. aperture
   374                              <1> 
   375                              <1> ; 15/03/2016
   376                              <1> ; FILE.ASM ('copy_source_file_to_destination_file')
   377 00016494 <res 00000001>      <1> copy_cmd_phase:       resb 1
   378 00016495 <res 00000001>      <1> csftdf_rw_err:	      resb 1
   379 00016496 <res 00000001>      <1> DestinationFileFound: resb 1
   380 00016497 <res 00000001>      <1> csftdf_cdrv: 	      resb 1
   381 00016498 <res 00000004>      <1> csftdf_filesize:      resd 1
   382                              <1> ; TRDOS386 (TRDOS v2.0)
   383 0001649C <res 00000004>      <1> csftdf_sf_mem_addr:   resd 1
   384 000164A0 <res 00000004>      <1> csftdf_sf_mem_bsize:  resd 1
   385                              <1> ;
   386                              <1> 
   387 000164A4 <res 00000004>      <1> csftdf_sf_cluster:    resd 1 ; 16/03/2016
   388 000164A8 <res 00000004>      <1> csftdf_df_cluster:    resd 1
   389                              <1> ; 16/03/2016
   390 000164AC <res 00000004>      <1> csftdf_r_size:        resd 1
   391 000164B0 <res 00000004>      <1> csftdf_w_size:        resd 1
   392 000164B4 <res 00000004>      <1> csftdf_sf_rbytes:     resd 1
   393 000164B8 <res 00000004>      <1> csftdf_df_wbytes:     resd 1
   394 000164BC <res 00000001>      <1> csftdf_percentage:    resb 1
   395                              <1> ; 17/03/2016
   396 000164BD <res 00000001>      <1> csftdf_videopage:     resb 1
   397 000164BE <res 00000002>      <1> csftdf_cursorpos:     resw 1
   398 000164C0 <res 00000004>      <1> csftdf_sf_drv_dt:     resd 1
   399 000164C4 <res 00000004>      <1> csftdf_df_drv_dt:     resd 1
   400                              <1> 
   401                              <1> ; 21/03/2016
   402                              <1> ; 20/03/2016
   403                              <1> ; FILE.ASM
   404 000164C8 <res 00000004>      <1> createfile_Name_Offset:  resd 1
   405 000164CC <res 00000004>      <1> createfile_FreeSectors:  resd 1 
   406 000164D0 <res 00000004>      <1> createfile_size:         resd 1
   407 000164D4 <res 00000004>      <1> createfile_FFCluster:    resd 1 ; 11/03/2016
   408 000164D8 <res 00000004>      <1> createfile_LastDirCluster: resd 1
   409 000164DC <res 00000004>      <1> createfile_Cluster:      resd 1
   410 000164E0 <res 00000004>      <1> createfile_PCluster:     resd 1
   411 000164E4 <res 00000001>      <1> createfile_attrib:	 resb 1
   412 000164E5 <res 00000001>      <1> createfile_SecPerClust:  resb 1
   413 000164E6 <res 00000002>      <1> createfile_DirIndex:     resw 1
   414 000164E8 <res 00000004>      <1> createfile_CCount:	 resd 1
   415 000164EC <res 00000002>      <1> createfile_BytesPerSec:	 resw 1 ; 23/03/2016
   416 000164EE <res 00000001>      <1> createfile_wfc:	         resb 1
   417 000164EF <res 00000001>      <1> createfile_UpdatePDir:	 resb 1 ; 31/03/2016
   418                              <1> 
   419                              <1> ;alignb 4
   420                              <1> 
   421                              <1> ; 11/04/2016
   422 000164F0 <res 00000002>      <1> env_var_length:	   resw 1
   423                              <1> 
   424 000164F2 <res 00000002>      <1> alignb 4
   425                              <1> 
   426                              <1> ; 25/04/2016
   427 000164F4 <res 00000001>      <1> readi.valid:	resb 1 ; valid data (>0 = valid for readi)
   428 000164F5 <res 00000001>      <1> readi.drv:	resb 1 ; drive number (0, 1,2,3,4..)
   429 000164F6 <res 00000001>      <1> readi.spc:	resb 1 ; sectors per cluster for 'readi' drive
   430 000164F7 <res 00000001>      <1> readi.s_index:  resb 1 ; sector index in current cluster (buffer)
   431 000164F8 <res 00000004>      <1> readi.sector:	resd 1 ; current disk sector
   432 000164FC <res 00000002>      <1> readi.bpc:	resw 1 ; bytes per cluster - 1
   433 000164FE <res 00000002>      <1> readi.offset:	resw 1 ; byte offset in cluster buffer
   434 00016500 <res 00000004>      <1> readi.cluster:  resd 1 ; current cluster number
   435 00016504 <res 00000004>      <1> readi.c_index:	resd 1 ; cluster index of the current cluster (0,1,2,3..)
   436 00016508 <res 00000004>      <1> readi.fclust:	resd 1 ; first cluster of the current cluster
   437 0001650C <res 00000004>      <1> readi.fs_index: resd 1 ; sector index in disk/file section (for Singlix FS)
   438                              <1> ;readi.buffer:	resd 1 ; readi sector buffer address
   439                              <1> 
   440                              <1> ;alignb 4
   441                              <1> 
   442 00016510 <res 00000001>      <1> writei.valid:	resb 1 ; valid data (>0 = valid for writei)
   443 00016511 <res 00000001>      <1> writei.drv:	resb 1 ; drive number (0, 1,2,3,4..)
   444 00016512 <res 00000001>      <1> writei.spc:	resb 1 ; sectors per cluster for 'writei' drive
   445 00016513 <res 00000001>      <1> writei.s_index: resb 1 ; sector index in current cluster (buffer)
   446 00016514 <res 00000004>      <1> writei.sector:	resd 1 ; current disk sector
   447 00016518 <res 00000002>      <1> writei.bpc:	resw 1 ; bytes per cluster - 1
   448 0001651A <res 00000002>      <1> writei.offset:	resw 1 ; byte offset in cluster buffer
   449 0001651C <res 00000004>      <1> writei.cluster: resd 1 ; current cluster number
   450 00016520 <res 00000004>      <1> writei.c_index:	resd 1 ; cluster index of the current cluster (0,1,2,3..)
   451 00016524 <res 00000004>      <1> writei.fclust:  resd 1 ; first cluster of the current cluster
   452 00016528 <res 00000004>      <1> writei.fs_index: resd 1 ; sector index in disk/file section (for Singlix FS)
   453                              <1> ;writei.buffer:	resd 1 ; writei sector buffer address
   454 0001652C <res 00000004>      <1> writei.lclust:	resd 1 ; writei last cluster (mget_w) ; 23/10/2016
   455 00016530 <res 00000004>      <1> writei.l_index:	resd 1 ; writei last cluster index (mget_w) ; 23/10/2016
   456 00016534 <res 00000001>      <1> writei.ofn:	resb 1 ; open file number (to be written) ; 23/10/2016
   457                              <1> 
   458 00016535 <res 00000003>      <1> alignb 4
   459                              <1> 
   460                              <1> ; 29/04/2016
   461 00016538 <res 00000004>      <1> Run_CDirFC:	resd 1
   462 0001653C <res 00000001>      <1> Run_Auto_Path:	resb 1
   463 0001653D <res 00000001>      <1> Run_Manual_Path: resb 1 ; 0 -> auto path sequence needed
   464 0001653E <res 00000001>      <1> EXE_ID:		resb 1	
   465 0001653F <res 00000001>      <1> EXE_dot:	resb 1
   466                              <1> 
   467                              <1> ; 06/05/2016
   468 00016540 <res 00000004>      <1> mainprog_return_addr: resd 1
   469 00016544 <res 00000004>      <1> last_error:	resd 1  ; this will be used to return error code to MainProg
   470                              <1> 			; 'lasterror' keyword will be used later to get the
   471                              <1> 			; last error code/number/status.
   472                              <1> ; 12/05/2016
   473 00016548 <res 00000004>      <1> video_eax:	resd 1  ; eax return value of video function
   474                              <1> 
   475                              <1> ; 01/06/2016
   476 0001654C <res 00000004>      <1> user_buffer:	resd 1  ; 'diskio.s' (INT 33h, Function 08h, floppy disk type)
   477                              <1> 
   478                              <1> ; 21/05/2016 - TRDOS 386 ('swap/switch', 'rswap', [u.pri])
   479 00016550 <res 00000001>      <1> priority:	resb 1  ; running priority level of process (0,1,2)
   480                              <1> 			; (run queue which is process comes from)
   481                              <1> ; 22/05/2016 - TRDOS 386 ('set_run_sequence', 'rtc_int', 'u_timer')
   482 00016551 <res 00000001>      <1> p_change:	resb 1  ; process change status (for timer events)
   483                              <1> ; 23/05/2016 - TRDOS 386 ('clock')
   484 00016552 <res 00000001>      <1> multi_tasking:	resb 1   ; Multi Tasking status (0 = disabled, >0 = enabled)
   485                              <1> 			; (EBX will return with user buffer addr or disk type)
   486                              <1> ; 07/06/2016
   487 00016553 <res 00000001>      <1> timer_events:	resb 1  ; number of (active) timer events, <= 16		
   488                              <1> 
   489                              <1> ; 24/06/2016
   490 00016554 <res 00000001>      <1> w_str_cmd:	resb 1	; WRITE_STRING command (0,1,2,3) ; video.s
   491 00016555 <res 00000001>      <1> p_crt_mode:	resb 1  ; previous video mode (=3 or 0), backup mark/sign
   492                              <1> ; 26/06/2016
   493 00016556 <res 00000001>      <1> p_crt_page:	resb 1  ; previous active page (for 'set_mode')
   494                              <1> ; 04/07/2016
   495 00016557 <res 00000001>      <1> noclearmem:	resb 1  ; if set, 'SET MODE' (INT 31h) function (AH = 4)
   496                              <1> 			; will not clear the video memory
   497                              <1> 			; (usable for graphics modes only)
   498                              <1> alignb 2
   499 00016558 <res 00000002>      <1> CRT_LEN:	resw 1  ; length of regen buffer in bytes
   500 0001655A <res 00000010>      <1> cursor_pposn:	resw 8  ; cursor positions backup
   501                              <1> 
   502                              <1> ; 10/07/2016 ('VGA_FONT_SETUP', INT 43H address for x86 real mode bios)
   503 0001656A <res 00000004>      <1> VGA_INT43H:	resd 1	; 0 = default (not configured by user)
   504                              <1> 			; 0FFFFFFFFh = user defined fonts
   505                              <1> 			; address:
   506                              <1> 			; 	vgafont8
   507                              <1> 			; 	vgafont16
   508                              <1> 			; 	vgafont14
   509                              <1> 
   510                              <1> ; 25/07/2016
   511 0001656E <res 00000001>      <1> VGA_MTYPE:	resb 1  ; 0=CTEXT,1=MTEXT,2=CGA,3=PLANAR1,4=PLANAR4,5=LINEAR 
   512                              <1> 
   513                              <1> ; 23/10/2016
   514 0001656F <res 00000001>      <1> setfmod		resb 1	; update last modification date&time sign (if >0)
   515                              <1> 			; (it is Open File Number + 1, if > 0)
   516                              <1> alignb 4
   517                              <1> 
   518                              <1> ; 16/10/2016
   519 00016570 <res 00000004>      <1> FFF_UBuffer:	resd 1  ; User's buffer address for FFF & FNF system calls 
   520                              <1> ; 15/10/2016
   521 00016574 <res 00000001>      <1> FFF_Valid:	resb 1  ; Find First File Structure validation byte
   522                              <1> 			; 0  = invalid (Find Next File can't use FFF struct)
   523                              <1> 			; >0 = valid, return type for FFF and Find Next File
   524                              <1> 			; 24 = basic parameters, 24 bytes
   525                              <1> 			; 128 = entire FFF structure/table, 128 bytes
   526                              <1> ; 16/10/2016 (FFF_Attrib: resw 1)
   527 00016575 <res 00000001>      <1> FFF_Attrib:	resb 1	; Find First File attributes for Find Next File (LB)
   528 00016576 <res 00000001>      <1> FFF_RType:	resb 1  ; FFF return type (0 = Basic, >0 = complete) (HB)
   529                              <1> ; 16/10/2016 - 05/10/2016 (Set Working Path)
   530 00016577 <res 00000001>      <1> SWP_inv_fname:	resb 1	; Set Working Path - Invalid File Name
   531 00016578 <res 00000002>      <1> SWP_Mode:	resw 1	; Set Working Path - Mode
   532 0001657A <res 00000001>      <1> SWP_DRV:	resb 1	; Set Working Path - Drive	
   533 0001657B <res 00000001>      <1> SWP_DRV_chg:	resb 1	; Set Working Path - Drive Change
   534                              <1> 
   535                              <1> ; 27/02/2017
   536 0001657C <res 00000001>      <1> fpready:	resb 1	; '80387 fpu is ready' flag	
   537                              <1> 
   538                              <1> ; 08/10/2016
   539 0001657D <res 00000009>      <1> device_name:    resb 9  ; capitalized (and zero padded) device canem 
   540                              <1> 			; (example: "TTY0",0,0,0,0,0")
   541                              <1> 
   542 00016586 <res 00000002>      <1> alignb 4
   543                              <1> 
   544                              <1> ; 08/10/2016
   545                              <1> ; 07/10/2016
   546                              <1> ; Table of kernel devices (which do not use installable device drivers)
   547                              <1> ; has been coded into KERNEL (trdosk9.s) 
   548                              <1> ; 07/10/2016
   549                              <1> ; 8 installable device drivers available to install (NUMIDEV)
   550 00016588 <res 00000020>      <1> IDEV_PGDIR: resd NUMIDEV
   551                              <1> 			; Page directories of installable device drivers
   552                              <1> 			;
   553                              <1> 			; Note: Virtual start address is always 400000h
   554                              <1> 			; (end of the 1st 4MB). [org 400000h]
   555                              <1> 			; Segments: KCODE, KDATA
   556                              <1> 			; Method: call 400000h (after changing page dir) 	
   557                              <1> 			; Query code located at the start (400000h).
   558                              <1> 			; Query code returns with
   559                              <1> 			;   eax = device type and driver version
   560                              <1> 			;         AL = Device Type minor
   561                              <1> 			;         AH = Device Type major
   562                              <1> 			;         Byte 16-23 : Version minor
   563                              <1> 			;	  Byte 24-31 : Version major - 1
   564                              <1> 			;		       (0:0 -> 1.0)
   565                              <1> 			;   ebx = initialization code address
   566                              <1> 			;   ecx = configuration table address
   567                              <1> 			;   edx = description table address
   568                              <1> 			;   esi = device (default) name address (ASCIIZ)
   569                              <1> 			;	 (name has "/DEV/" prefix)		
   570                              <1> 			;   edi = dispatch table address
   571                              <1> 			;        (for calling kernel-device functions)
   572                              <1> 			;   ebp = address table address
   573                              <1> 			; Initialization code returns with
   574                              <1> 			;   eax = open code address
   575                              <1> 			;   ecx = close code address 
   576                              <1> 			;   ebx = read code address
   577                              <1> 			;   edx = write code address 	
   578                              <1> 			;   esi = IOCTL code address
   579                              <1> 			;   edi = dispatch table address
   580                              <1> 			;   ebp = address table address
   581                              <1> 			; Address Table:
   582                              <1> 			;    Offset 0  : open code address
   583                              <1> 			;    Offset 4  : read code address
   584                              <1> 			;    Offset 8  : write code address
   585                              <1> 			;    Offset 12 : close code address
   586                              <1> 			;    Offset 16 : IOCTL code address
   587                              <1> 			;    Offset 20 : initialization code address
   588                              <1> 			;    Offset 24 : description table address
   589                              <1> 			;    Offset 28 : configuration table address
   590                              <1> 			;    Offset 32 : device name address
   591                              <1> 			;    Offset 36 : dispatch table address
   592                              <1> 			;          (for calling kernel-device functions)
   593                              <1> 
   594 000165A8 <res 00000040>      <1> IDEV_NAME:  resb 8*NUMIDEV 
   595                              <1> 			; 8 byte names of installable device drivers
   596                              <1> 
   597 000165E8 <res 00000008>      <1> IDEV_TYPE:  resb NUMIDEV ; Driver type of installable device drivers
   598 000165F0 <res 00000008>      <1> IDEV_FLAGS: resb NUMIDEV ; Device access parameters for installable
   599                              <1>                          ; device drivers (These values are set while
   600                              <1> 			 ; the device driver is being loaded.)
   601 000165F8 <res 00000020>      <1> IDEV_OADDR: resd NUMIDEV ; open function addr for installable dev driver
   602 00016618 <res 00000020>      <1> IDEV_CADDR: resd NUMIDEV ; close function addr for installable dev driver
   603 00016638 <res 00000020>      <1> IDEV_RADDR: resd NUMIDEV ; read function addr for installable dev driver
   604 00016658 <res 00000020>      <1> IDEV_WADDR: resd NUMIDEV ; write function addr for installable dev driver
   605                              <1> 	
   606                              <1> ; 08/10/2016	
   607                              <1> ; 07/10/2016
   608                              <1> ; Device Open and Access parameters
   609 00016678 <res 0000001E>      <1> DEV_ACCESS:	 resb NUMOFDEVICES   ; bit 0 = accessable by normal users
   610                              <1> 				     ; bit 1 = read access permission
   611                              <1> 				     ; bit 2 = write access permission
   612                              <1> 				     ; bit 3 = IOCTL permission to users
   613                              <1> 				     ; bit 4 = block device if it is set	
   614                              <1> 				     ; bit 5 = 16 bit or 1024 byte data
   615                              <1> 				     ; bit 6 = 32 bit or 2048 byte data
   616                              <1> 				     ; bit 7 = installable device driver
   617 00016696 <res 0000001E>      <1> DEV_R_OWNER:	 resb NUMOFDEVICES   ; Reading owner no (u.uid) of devices		
   618 000166B4 <res 0000001E>      <1> DEV_R_OPENCOUNT: resb NUMOFDEVICES   ; Reading open count 
   619 000166D2 <res 0000001E>      <1> DEV_W_OWNER:	 resb NUMOFDEVICES   ; Writing owner no (u.uid) of devices		
   620 000166F0 <res 0000001E>      <1> DEV_W_OPENCOUNT: resb NUMOFDEVICES   ; Writing open count
   621 0001670E <res 0000001E>      <1> DEV_DRIVER:	 resb NUMOFDEVICES   ; device driver number (1 to 7Fh)
   622                              <1> 				     ; *if bit 7 is set (80 to FFh)
   623                              <1> 				     ; *if it is installable device driver
   624                              <1> 				     ; *index (0 to 7Fh)
   625                              <1> 				     ; otherwise it is kernel device index
   626 0001672C <res 0000001E>      <1> DEV_OPENMODE:	 resb NUMOFDEVICES   ; 1 = read mode
   627                              <1> 				     ; 2 = write mode
   628                              <1> 				     ; 3 = read & write 	  
   629                              <1> 				     ; 0 = not open (free)		
   630 0001674A <res 00000078>      <1> DEV_NAME_PTR:    resd NUMOFDEVICES   ; pointers to name addresses of drivers
   631                              <1> 				     ; Address base: KDEV_NAME+		
   632                              <1> 				     ; or IDEV_NAME+
   633 000167C2 <res 00000078>      <1> DEV_R_POINTER:	 resd NUMOFDEVICES   ; reading pointer, writing pointer	
   634 0001683A <res 00000078>      <1> DEV_W_POINTER:	 resd NUMOFDEVICES   ; sector number if block device
   635                              <1> 				     ; character offset if char device
   636 000168B2 <res 00000002>      <1> alignb 4
   637                              <1> 
   638                              <1> ; 06/10/2016
   639                              <1> ; Open File Parameters
   640 000168B4 <res 00000028>      <1> OF_FCLUSTER:	resd OPENFILES  ; First clusters of open files
   641 000168DC <res 0000000A>      <1> OF_DRIVE:	resb OPENFILES  ; Logical DOS drive numbers of open files 
   642 000168E6 <res 0000000A>      <1> OF_MODE:	resb OPENFILES  ; Open mode (1 = read, 2 = write, 3 = r&w) 
   643 000168F0 <res 0000000A>      <1> OF_STATUS:	resb OPENFILES  ; (bit 0 = read, bit 1 = write)
   644 000168FA <res 0000000A>      <1> OF_OPENCOUNT:	resb OPENFILES  ; Open counts of open files
   645 00016904 <res 00000028>      <1> OF_POINTER:	resd OPENFILES	; File seek/read/write pointer
   646 0001692C <res 00000028>      <1> OF_SIZE:	resd OPENFILES	; File sizes of open files (in bytes)
   647 00016954 <res 00000028>      <1> OF_DIRFCLUSTER:	resd OPENFILES  ; Directory First Clusters of open files
   648 0001697C <res 00000028>      <1> OF_DIRCLUSTER:	resd OPENFILES  ; Directory (Entry) Clusters of open files
   649 000169A4 <res 00000028>      <1> OF_VOLUMEID:	resd OPENFILES  ; Vol ID for removable drives of open files
   650 000169CC <res 00000028>      <1> OF_CCLUSTER:	resd OPENFILES  ; Current clusters of open files
   651 000169F4 <res 00000028>      <1> OF_CCINDEX:	resd OPENFILES  ; Cluster index numbers of current clusters
   652                              <1> ; 24/10/2016
   653 00016A1C <res 00000014>      <1> OF_DIRENTRY:	resw OPENFILES  ; Directory entry index no. in dir cluster 
   654                              <1> 				; Sector index = entry index / 16
   655                              <1> ;alignb 2
   656                              <1> 
   657 00016A30 <res 00000060>      <1> DTA:		resd 24		; Find First File data transfer area
   658                              <1> 
   659                              <1> ; 19/12/2016
   660 00016A90 <res 00000001>      <1> tcallback:	resb 1		; Timer callback method flag for 'systimer'
   661 00016A91 <res 00000001>      <1> trtc:		resb 1		; Timer interrupt type flag for 'systimer'
   662                              <1> ; 20/02/2017
   663 00016A92 <res 00000001>      <1> no_page_swap:	resb 1		; Swap lock for Signal Response Byte pages 
   664                              <1> ;;15/01/2017
   665                              <1> ; 02/01/2017
   666                              <1> ;;intflg:	resb 1		; software interrupt in progress signal
   667                              <1> 				; (for timer interrupt)
   668                              <1> 
   669 00016A93 <res 00000001>      <1> alignb 4
   670                              <1> ; 13/04/2017
   671 00016A94 <res 0000001E>      <1> DEV_INTR:	resb NUMOFDEVICES ; Device Interrupt (IRQ) number + 1	
   672                              <1> 				; (0= not available, 1= IRQ 0, 16= IRQ 15)
   673 00016AB2 <res 00000040>      <1> DEV_INT_HNDLR:	resd 16		; Device Interrupt Handler addr, if > 0 	
   674                              <1> 
   675                              <1> 
   676                              <1> ;alignb 4
   677                              <1> 
   678                              <1> ; 26/02/2017 ; IRQ Callback parameters ('syscalbac')
   679                              <1> ;Index: ; 0 to 8
   680                              <1> ;	0 = IRQ3, 1 = IRQ4, 2 = IRQ5, 3 = IRQ7
   681                              <1> ;	4 = IRQ9, 5 = IRQ10, 6 = IRQ11, 7 = IRQ12, 8 = IRQ13  
   682 00016AF2 <res 00000009>      <1> IRQ.owner:	resb 9		; owner, 0 = free, >0 = [u.uno]
   683 00016AFB <res 00000009>      <1> IRQ.dev:	resb 9		; 0 = default/kernel, >0 = device number
   684 00016B04 <res 00000009>      <1> IRQ.method:	resb 9 		; 0 = Signal Response Byte, 1 = Callback
   685 00016B0D <res 00000009>      <1> IRQ.srb:	resb 9 		; Signal Response/Return Byte value
   686 00016B16 <res 00000024>      <1> IRQ.addr:	resd 9		; Rignal Response Byte address (physical)
   687                              <1> 				; or Callback service address (virtual)
   688                              <1> ; 28/02/2017
   689 00016B3A <res 00000004>      <1> IRQ_cr3:	resd 1		; for saving cr3 register in IRQ handler
   690 00016B3E <res 00000001>      <1> IRQnum:		resb 1		; IRQ number for IRQ handler (trdosk8.s)
   691                              <1> 
   692                              <1> ; 10/04/2017
   693                              <1> ; 03/04/2017
   694                              <1> ; UNINITIALIZED AUDIO DATA
   695 00016B3F <res 00000001>      <1> alignb 4
   696 00016B40 <res 00000001>      <1> audio_pci:	resb 1
   697 00016B41 <res 00000001>      <1> audio_device:	resb 1
   698 00016B42 <res 00000001>      <1> audio_mode:	resb 1
   699 00016B43 <res 00000001>      <1> audio_intr:	resb 1
   700 00016B44 <res 00000001>      <1> audio_busy:	resb 1  ; Busy flag for audio irq ; 21/04/2017
   701 00016B45 <res 00000001>      <1> audio_reserved: resb 1
   702 00016B46 <res 00000002>      <1> audio_io_base:	resw 1 	; Base I/O address of audio device
   703 00016B48 <res 00000004>      <1> audio_dev_id:	resd 1	; BUS/DEV/FN ; 00000000BBBBBBBBDDDDDFFF00000000
   704 00016B4C <res 00000004>      <1> audio_vendor:	resd 1
   705 00016B50 <res 00000004>      <1> audio_stats_cmd: resd 1
   706                              <1> ;
   707 00016B54 <res 00000004>      <1> audio_buffer:	resd 1	; virtual address of user's audio buffer
   708 00016B58 <res 00000004>      <1> audio_p_buffer:	resd 1	; Physical address of user's audio buffer
   709 00016B5C <res 00000004>      <1> audio_buff_size: resd 1 ; user's audio buffer size (half buffer size) 
   710 00016B60 <res 00000004>      <1> audio_dma_buff: resd 1  ; dma buffer address
   711 00016B64 <res 00000004>      <1> audio_dmabuff_size: resd 1 ; dma buffer size (2 * half buffer size)
   712 00016B68 <res 00000001>      <1> audio_flag:	resb 1  ; dma buffer flag (1st half = 0, 2nd half = 1)
   713 00016B69 <res 00000001>      <1> audio_user:	resb 1	; user number of the owner
   714 00016B6A <res 00000001>      <1> audio_cb_mode:	resb 1	; 0 = signal response byte method
   715                              <1> 			; 1 = callback method
   716                              <1> 			; 2 = s.r.b. method with auto increment
   717 00016B6B <res 00000001>      <1> audio_srb:	resb 1	; signal response byte value
   718 00016B6C <res 00000004>      <1> audio_cb_addr:	resd 1  ; callback service address or s.r.b. address
   719                              <1> 			; (s.r.b. addr is physical, cbs addr is virtual)
   720                              <1> 
   721 00016B70 <res 00000001>      <1> audio_bps:	resb 1  ; selected mode: 8 bit, 16 bit
   722 00016B71 <res 00000001>      <1> audio_stmo:	resb 1	; selected mode: mono /stereo
   723 00016B72 <res 00000002>      <1> audio_freq: 	resw 1	; sampling rate
   724                              <1> 
   725                              <1> ; 21/04/2017
   726 00016B74 <res 00000001>      <1> audio_play_cmd: resb 1  ; Play/Stop command (1 = play, 0 = stop)
   727                              <1> audio_civ: ; 28/05/2017 ; Current Buffer Index (AC'97)
   728 00016B75 <res 00000001>      <1> audio_flag_eol:	resb 1  ; End of Link status (vt8233, EOL/FLAG)
   729                              <1> 
   730                              <1> audio_master_volume:
   731 00016B76 <res 00000001>      <1> audio_master_volume_l: resb 1 ; sound volume (lineout) left channel
   732 00016B77 <res 00000001>      <1> audio_master_volume_r: resb 1 ; sound volume (lineout) right channel
   733                              <1> 
   734                              <1> alignb 4
   735                              <1> ; 28/05/2017
   736                              <1> ; AC'97 Audio Controller Base Adress Registers
   737 00016B78 <res 00000002>      <1> NAMBAR:		resw 1	; Native Audio Mixer Base Address
   738 00016B7A <res 00000002>      <1> NABMBAR:	resw 1	; Native Audio Bus Mastering Base Address
   739                              <1> 	
   740                              <1> ;alignb 4
   741                              <1> ; 21/04/2017
   742 00016B7C <res 00000400>      <1> audio_bdl_buff:	resd 32*8  ; VT8233 (AC97) BDL Buffer Size
   743                              <1> ; 12/05/2017
   744 00016F7C <res 00000004>      <1> base_addr:	resd 1	; 'direct_memory_access' (memory.s)
   745                              <1> 
   746                              <1> ; 28/08/2017
   747                              <1> ; 20/08/2017
   748 00016F80 <res 00000001>      <1> 		resb 1  ;
   749 00016F81 <res 00000001>      <1> dma_user:	resb 1	; user number for sysdma
   750 00016F82 <res 00000001>      <1> dma_channel:	resb 1	; dma channel for sysdma
   751 00016F83 <res 00000001>      <1> dma_mode:	resb 1  ; dma mode for sysdma	
   752 00016F84 <res 00000004>      <1> dma_addr:	resd 1	; dma buffer physical addr for sysdma
   753 00016F88 <res 00000004>      <1> dma_size:	resd 1  ; dma buffer size (in bytes) for sysdma
   754 00016F8C <res 00000004>      <1> dma_start:	resd 1  ; dma start address for sysdma
   755 00016F90 <res 00000004>      <1> dma_count:	resd 1  ; dma count (in bytes) for sysdma 
   756                              <1> 
   757 00016F94 <res 0000906C>      <1> alignb 65536
   758                              <1> ; 09/08/2017
   759                              <1> ; 12/05/2017
   760 00020000 <res 00010000>      <1> sb16_dma_buffer: resb 65536 ; DMA buffer for sb16 audio playing.
  2830                                  ; 24/01/2016
  2831                                  %include 'ubss.s'	; UNINITIALIZED KERNEL (USER) DATA
     1                              <1> ; ****************************************************************************
     2                              <1> ; TRDOS386.ASM (TRDOS 386 Kernel - v2.0.0) - UNINITIALIZED USER DATA : ubss.s
     3                              <1> ; ----------------------------------------------------------------------------
     4                              <1> ; Last Update: 28/02/2017
     5                              <1> ; ----------------------------------------------------------------------------
     6                              <1> ; Beginning: 24/01/2016
     7                              <1> ; ----------------------------------------------------------------------------
     8                              <1> ; Assembler: NASM version 2.11 (trdos386.s)
     9                              <1> ; ----------------------------------------------------------------------------
    10                              <1> ; Derived from 'Retro UNIX 386 Kernel - v0.2.1.0' source code by Erdogan Tan
    11                              <1> ; ux.s (04/12/2015)
    12                              <1> ; ****************************************************************************
    13                              <1> 
    14                              <1> ; Retro UNIX 386 v1 Kernel - ux.s
    15                              <1> ; Last Modification: 04/12/2015
    16                              <1> ;
    17                              <1> ; ///////// RETRO UNIX 386 V1 SYSTEM DEFINITIONS ///////////////
    18                              <1> ; (Modified from 
    19                              <1> ;	Retro UNIX 8086 v1 system definitions in 'UNIX.ASM', 01/09/2014)
    20                              <1> ; ((UNIX.ASM (RETRO UNIX 8086 V1 Kernel), 11/03/2013 - 01/09/2014))
    21                              <1> ; ----------------------------------------------------------------------------
    22                              <1> ; Derived from UNIX Operating System (v1.0 for PDP-11) 
    23                              <1> ; (Original) Source Code by Ken Thompson (1971-1972)
    24                              <1> ; <Bell Laboratories (17/3/1972)>
    25                              <1> ; <Preliminary Release of UNIX Implementation Document>
    26                              <1> ; (Section E10 (17/3/1972) - ux.s)
    27                              <1> ; ****************************************************************************
    28                              <1> 
    29                              <1> alignb 2
    30                              <1> 
    31                              <1> inode:
    32                              <1> 	; 11/03/2013. 
    33                              <1> 	;Derived from UNIX v1 source code 'inode' structure (ux).
    34                              <1> 	;i.
    35                              <1> 
    36 00030000 <res 00000002>      <1> 	i.flgs:	 resw 1
    37 00030002 <res 00000001>      <1> 	i.nlks:	 resb 1
    38 00030003 <res 00000001>      <1> 	i.uid:	 resb 1
    39                              <1>         ;i.size:  resw 1 ; size
    40 00030004 <res 00000002>      <1> 	resw 1 ; 29/04/2016
    41 00030006 <res 00000010>      <1> 	i.dskp:	 resw 8 ; 16 bytes
    42 00030016 <res 00000004>      <1> 	i.ctim:	 resd 1
    43 0003001A <res 00000004>      <1> 	i.mtim:	 resd 1
    44 0003001E <res 00000002>      <1> 	i.rsvd:  resw 1 ; Reserved (ZERO/Undefined word for UNIX v1.)
    45                              <1> 
    46                              <1> I_SIZE	equ $ - inode 
    47                              <1> 
    48                              <1> process:
    49                              <1> 	; 19/12/2016
    50                              <1> 	; 21/05/2016
    51                              <1> 	; 19/05/2016 - TRDOS 386 (TRDOS v2.0)
    52                              <1> 	; 06/05/2015 - Retro UNIX 386 v1
    53                              <1> 	; 11/03/2013 - 05/02/2014 (Retro UNIX 8086 v1)
    54                              <1> 	;Derived from UNIX v1 source code 'proc' structure (ux).
    55                              <1> 	;p.
    56                              <1> 	
    57 00030020 <res 00000020>      <1>         p.pid:   resw nproc
    58 00030040 <res 00000020>      <1>         p.ppid:  resw nproc
    59 00030060 <res 00000020>      <1>         p.break: resw nproc
    60 00030080 <res 00000010>      <1>         p.ttyc:  resb nproc ; console tty in Retro UNIX 8086 v1.
    61 00030090 <res 00000010>      <1> 	p.waitc: resb nproc ; waiting channel in Retro UNIX 8086 v1.
    62 000300A0 <res 00000010>      <1> 	p.link:	 resb nproc
    63 000300B0 <res 00000010>      <1> 	p.stat:	 resb nproc
    64                              <1> 
    65                              <1> 	; 06/05/2015 (Retro UNIX 386 v1 feature only !) 
    66 000300C0 <res 00000040>      <1> 	p.upage: resd nproc ; Physical address of the process's
    67                              <1> 			    ; 'user' structure
    68                              <1> 	; 21/05/2016	
    69                              <1> 	; 19/05/2016 (TRDOS 386 feature only!)
    70 00030100 <res 00000010>      <1> 	p.timer: resb nproc ; number of timer events of the processs
    71                              <1> 
    72                              <1> 	; 19/12/2016
    73 00030110 <res 00000040>      <1> 	p.tcb:	resd nproc ; timer callback service address (if > 0)
    74                              <1> 			  		 			 	  
    75                              <1> P_SIZE	equ $ - process
    76                              <1> 
    77                              <1> ; fsp table (original UNIX v1)
    78                              <1> ;
    79                              <1> ;Entry
    80                              <1> ;          15                                      0
    81                              <1> ;  1     |---|---------------------------------------|
    82                              <1> ;        |r/w|       i-number of open file           |
    83                              <1> ;        |---|---------------------------------------| 
    84                              <1> ;        |               device number               |
    85                              <1> ;        |-------------------------------------------|
    86                              <1> ;    (*) | offset pointer, i.e., r/w pointer to file |
    87                              <1> ;        |-------------------------------------------| 
    88                              <1> ;        |  flag that says    | number of processes  |
    89                              <1> ;        |   file deleted     | that have file open  |
    90                              <1> ;        |-------------------------------------------| 
    91                              <1> ;  2     |                                           |
    92                              <1> ;        |-------------------------------------------| 
    93                              <1> ;        |                                           |
    94                              <1> ;        |-------------------------------------------|
    95                              <1> ;        |                                           |
    96                              <1> ;        |-------------------------------------------|
    97                              <1> ;        |                                           |
    98                              <1> ;        |-------------------------------------------| 
    99                              <1> ;  3     |                                           | 
   100                              <1> ;        |                                           |  
   101                              <1> ;
   102                              <1> ; (*) Retro UNIX 386 v1 modification: 32 bit offset pointer 
   103                              <1> 
   104                              <1> 
   105                              <1> ; 15/04/2015
   106 00030150 <res 000001F4>      <1> fsp:	 resb nfiles * 10 ; 11/05/2015 (8 -> 10)
   107 00030344 <res 00000002>      <1> idev:	 resw 1 ; device number is 1 byte in Retro UNIX 8086 v1 !
   108 00030346 <res 00000002>      <1> cdev:    resw 1 ; device number is 1 byte in Retro UNIX 8086 v1 !
   109                              <1> ; 18/05/2015
   110                              <1> ; 26/04/2013 device/drive parameters (Retro UNIX 8086 v1 feature only!)
   111                              <1> ; 'UNIX' device numbers (as in 'cdev' and 'u.cdrv')
   112                              <1> ;	0 -> root device (which has Retro UNIX 8086 v1 file system)
   113                              <1> ; 	1 -> mounted device (which has Retro UNIX 8086 v1 file system)
   114                              <1> ; 'Retro UNIX 8086 v1' device numbers: (for disk I/O procedures)
   115                              <1> ;	0 -> fd0 (physical drive, floppy disk 1), physical drive number = 0
   116                              <1> ;	1 -> fd1 (physical drive, floppy disk 2), physical drive number = 1
   117                              <1> ;	2 -> hd0 (physical drive, hard disk 1), physical drive number = 80h
   118                              <1> ;	3 -> hd1 (physical drive, hard disk 2), physical drive number = 81h
   119                              <1> ;	4 -> hd2 (physical drive, hard disk 3), physical drive number = 82h
   120                              <1> ;	5 -> hd3 (physical drive, hard disk 4), physical drive number = 83h
   121 00030348 <res 00000001>      <1> rdev:	 resb 1 ; root device number ; Retro UNIX 8086 v1 feature only!
   122                              <1> 	        ; as above, for physical drives numbers in following table
   123 00030349 <res 00000001>      <1> mdev:	 resb 1 ; mounted device number ; Retro UNIX 8086 v1 feature only!
   124                              <1> ; 15/04/2015
   125 0003034A <res 00000001>      <1> active:	 resb 1 
   126 0003034B <res 00000001>      <1> 	 resb 1 ; 09/06/2015
   127 0003034C <res 00000002>      <1> mnti:	 resw 1
   128 0003034E <res 00000002>      <1> mpid:	 resw 1
   129 00030350 <res 00000002>      <1> rootdir: resw 1
   130                              <1> 
   131                              <1> ; 21/05/2016 - TRDOS 386 (TRDOS v2.0) - priority levels, 3 run queues 
   132                              <1> runq:
   133 00030352 <res 00000002>      <1> runq_event:	 resw 1 ; high priority, 'run for event'            ; 2
   134 00030354 <res 00000002>      <1> runq_normal:	 resw 1 ; normal/regular priority, 'run as reqular' ; 1
   135 00030356 <res 00000002>      <1> runq_background: resw 1 ; low priority, 'run on background'         ; 0
   136                              <1> ;
   137 00030358 <res 00000001>      <1> imod:	 resb 1
   138 00030359 <res 00000001>      <1> smod:	 resb 1
   139 0003035A <res 00000001>      <1> mmod:	 resb 1
   140 0003035B <res 00000001>      <1> sysflg:	 resb 1
   141                              <1> 
   142                              <1> alignb 4
   143                              <1> 
   144                              <1> user:
   145                              <1> 	; 13/01/2017
   146                              <1> 	; 19/12/2016
   147                              <1> 	; 21/05/2016 - TRDOS 386 (TRDOS v2.0) 
   148                              <1> 	; 	       [u.pri] usage method modification
   149                              <1> 	; 04/12/2015 
   150                              <1> 	; 18/10/2015
   151                              <1> 	; 12/10/2015
   152                              <1> 	; 21/09/2015
   153                              <1> 	; 24/07/2015
   154                              <1> 	; 16/06/2015
   155                              <1> 	; 09/06/2015
   156                              <1> 	; 11/05/2015
   157                              <1> 	; 16/04/2015 (Retro UNIX 386 v1 - 32 bit modifications)
   158                              <1> 	; 10/10/2013
   159                              <1> 	; 11/03/2013. 
   160                              <1> 	;Derived from UNIX v1 source code 'user' structure (ux).
   161                              <1> 	;u.
   162                              <1> 
   163 0003035C <res 00000004>      <1> 	u.sp:	  resd 1 ; esp (kernel stack at the beginning of 'sysent')
   164 00030360 <res 00000004>      <1> 	u.usp:	  resd 1 ; esp (kernel stack points to user's registers)
   165 00030364 <res 00000004>      <1> 	u.r0:	  resd 1 ; eax
   166 00030368 <res 00000002>      <1> 	u.cdir:	  resw 1
   167 0003036A <res 0000000A>      <1> 	u.fp:	  resb 10
   168 00030374 <res 00000004>      <1> 	u.fofp:	  resd 1
   169 00030378 <res 00000004>      <1> 	u.dirp:	  resd 1
   170 0003037C <res 00000004>      <1> 	u.namep:  resd 1
   171 00030380 <res 00000004>      <1> 	u.off:	  resd 1
   172 00030384 <res 00000004>      <1> 	u.base:	  resd 1
   173 00030388 <res 00000004>      <1> 	u.count:  resd 1
   174 0003038C <res 00000004>      <1> 	u.nread:  resd 1
   175 00030390 <res 00000004>      <1> 	u.break:  resd 1 ; break
   176 00030394 <res 00000002>      <1> 	u.ttyp:	  resw 1 
   177                              <1> 	; 10/01/2017 (TRDOS 386, relocation and dword alignment)
   178                              <1> 	; tty number (rtty, rcvt, wtty)
   179 00030396 <res 00000001>      <1> 	u.ttyn:	  resb 1 ; 28/07/2013 - Retro Unix 8086 v1 feature only !
   180 00030397 <res 00000001>      <1> 	u.resb:   resb 1 ; 10/01/2017 (TRDOS 386, temporary)
   181 00030398 <res 00000010>      <1> 	u.dirbuf: resb 16 ; 04/12/2015 (10 -> 16) 
   182                              <1> 	;u.pri:	  resw 1 ; 14/02/2014
   183 000303A8 <res 00000001>      <1> 	u.quant:  resb 1 ; Retro UNIX 8086 v1 Feature only ! (uquant)
   184 000303A9 <res 00000001>      <1> 	u.pri:	  resb 1 ; Modification: 21/05/2016 (priority levels: 0, 1, 2)
   185 000303AA <res 00000002>      <1> 	u.intr:	  resw 1
   186 000303AC <res 00000002>      <1> 	u.quit:	  resw 1
   187                              <1> 	;u.emt:	  resw 1 ; 10/10/2013
   188                              <1> 	;u.ilgins: resw 1 ; 10/01/2017
   189 000303AE <res 00000002>      <1> 	u.cdrv:	  resw 1 ; cdev
   190 000303B0 <res 00000001>      <1> 	u.uid:	  resb 1 ; uid
   191 000303B1 <res 00000001>      <1> 	u.ruid:	  resb 1
   192 000303B2 <res 00000001>      <1> 	u.bsys:	  resb 1
   193 000303B3 <res 00000001>      <1> 	u.uno:	  resb 1
   194 000303B4 <res 00000004>      <1>         u.upage:  resd 1 ; 16/04/2015 - Retro Unix 386 v1 feature only !
   195 000303B8 <res 00000004>      <1> 	u.pgdir:  resd 1 ; 09/03/2015 (page dir addr of process)
   196 000303BC <res 00000004>      <1> 	u.ppgdir: resd 1 ; 06/05/2015 (page dir addr of the parent process)
   197 000303C0 <res 00000004>      <1> 	u.pbase:  resd 1 ; 20/05/2015 (physical base/transfer address)
   198 000303C4 <res 00000002>      <1> 	u.pcount: resw 1 ; 20/05/2015 (byte -transfer- count for page)
   199                              <1> 	;u.pncount: resw 1 
   200                              <1> 		; 16/06/2015 (byte -transfer- count for page, 'namei', 'mkdir')
   201                              <1> 	;u.pnbase:  resd 1 
   202                              <1> 		; 16/06/2015 (physical base/transfer address, 'namei', 'mkdir')
   203                              <1> 			 ; 09/06/2015
   204 000303C6 <res 00000001>      <1> 	u.kcall:  resb 1 ; The caller is 'namei' (dskr) or 'mkdir' (dskw) sign		
   205 000303C7 <res 00000001>      <1> 	u.brwdev: resb 1 ; Block device number for direct I/O (bread & bwrite)
   206                              <1> 			 ; 24/07/2015 - 24/06/2015
   207                              <1> 	;u.args:  resd 1 ; arguments list (line) offset from start of [u.upage]
   208                              <1> 			 ; (arg list/line is from offset [u.args] to 4096 in [u.upage])
   209                              <1> 			 ; ([u.args] points to argument count -argc- address offset)
   210                              <1>  			 ; 24/06/2015	  	
   211                              <1> 	;u.core:  resd 1 ; physical start address of user's memory space (for sys exec)
   212                              <1> 	;u.ecore: resd 1 ; physical end address of user's memory space (for sys exec)
   213                              <1> 	; last error number
   214 000303C8 <res 00000004>      <1> 	u.error:  resd 1 ; 28/07/2013 - 09/03/2015 
   215                              <1> 		        ; Retro UNIX 8086/386 v1 feature only!
   216                              <1> 			; 21/09/2015 (debugging - page fault analyze)
   217 000303CC <res 00000004>      <1> 	u.pfcount: resd 1 ; page fault count for (this) process (for sys geterr)
   218                              <1> 		; 19/12/2016 (TRDOS 386)	
   219 000303D0 <res 00000004>      <1> 	u.tcb:	  resd 1 ; Timer callback address/flag which will be used by timer int
   220                              <1> 		; 13/01/2017 (TRDOS 386)
   221 000303D4 <res 00000001>      <1> 	u.t_lock: resb 1 ; Timer interrupt (callback) lock (unlocked by 'sysrele')
   222 000303D5 <res 00000001>      <1> 	u.t_mode: resb 1 ; running mode during timer interrupt (0= system, 0FFh= user)
   223                              <1> 		; 26/02/2017 (TRDOS 386)
   224 000303D6 <res 00000001>      <1> 	u.irqc:	  resb 1  ; Count of IRQ callback services (IRQs in use)
   225                              <1> 		; 28/02/2017 (TRDOS 386) 
   226 000303D7 <res 00000001>      <1> 	u.irqwait: resb 1 ; IRQ waiting for callback service flag (IRQ number, If > 0)
   227 000303D8 <res 00000001>      <1> 	u.r_lock:  resb 1 ; 'IRQ callback service is in progress' flag (IRQ lock)
   228 000303D9 <res 00000001>      <1> 	u.r_mode:  resb 1 ; running mode during hadware interrupt	
   229                              <1> 		; 27/02/2017 (TRDOS 386) 
   230 000303DA <res 00000001>      <1> 	u.fpsave: resb 1  ; TRDOS 386, 'save/restore FPU registers' flag
   231 000303DB <res 00000001>      <1> alignb 4
   232 000303DC <res 0000005E>      <1> 	u.fpregs: resb 94 ; 94 byte area for saving and restoring FPU registers	
   233                              <1> 
   234 0003043A <res 00000002>      <1> alignb 4
   235                              <1> 
   236                              <1> U_SIZE	equ $ - user
   237                              <1> 
   238                              <1> ; 18/10/2015 - Retro UNIX 386 v1 (local variables for 'namei' and 'sysexec')
   239 0003043C <res 00000004>      <1> pcore:  resd 1  ; physical start address of user's memory space (for sys exec)
   240 00030440 <res 00000004>      <1> ecore:  resd 1  ; physical address of user's stack/last page (for sys exec)
   241 00030444 <res 00000004>      <1> nbase:	resd 1	; physical base address for 'namei' & 'sysexec'
   242 00030448 <res 00000002>      <1> ncount: resw 1	; remain byte count in page for 'namei' & 'sysexec'
   243 0003044A <res 00000002>      <1> argc:	resw 1	; argument count for 'sysexec'
   244 0003044C <res 00000004>      <1> argv:	resd 1	; argument list (recent) address for 'sysexec'
   245                              <1> 
   246                              <1> ; 03/06/2015 - Retro UNIX 386 v1 Beginning
   247                              <1> ; 07/04/2013 - 31/07/2013 - Retro UNIX 8086 v1
   248 00030450 <res 00000001>      <1> rw: 	 resb 1 ;; Read/Write sign (iget)
   249                              <1> 
   250                              <1> ;alignb 4
   251                              <1> 
   252                              <1> ; 24/04/2016
   253 00030451 <res 00000004>      <1> ii:		resd 1 ; first cluster of the program file
   254 00030455 <res 00000004>      <1> i.size:		resd 1 ; size of the program file
  2832                                  
  2833 00030459 <res 00000003>          alignb 4
  2834                                  
  2835                                  ; 23/05/2016 (TRDOS 386)
  2836                                  ; 14/10/2015 (Retro UNIX 386 v1, 'unix386.s')
  2837 0003045C <res 00000004>          cr3reg:	 resd 1  ; cr3 register content at the beginning of the timer
  2838                                  		 ; (or RTC) interrupt handler.
  2839                                  
  2840                                  ; 10/12/2016 (callback)
  2841                                  ; 10/06/2016
  2842                                  ; 19/05/2016
  2843                                  ; 18/05/2016 - TRDOS 386 feature only !
  2844 00030460 <res 00000100>          timer_set: resd 16*4   ; 256 bytes memory space for 16 timer events
  2845                                  	; Timer Event Structure: (max. 16 timer events, 16*16 bytes)
  2846                                  	;       Owner:	        resb 1 ; 0 = free
  2847                                  	;		  	       ;>0 = process number (u.uno)
  2848                                  	;	Callback:	resb 1 ; 0 = response byte address (phy)
  2849                                  	;				 1 = callback address (virtual)				
  2850                                  	;	Interrupt:      resb 1 ; 0 = Timer interrupt (or none)
  2851                                  	;		   	       ; 1 = Real Time Clock interrupt 
  2852                                  	;	Response:       resb 1 ; 0 to 255, signal return value
  2853                                  	;	Count Limit:	resd 1 ; count of ticks (total/set)
  2854                                  	;	Current Count: 	resd 1 ; count of ticks (current)
  2855                                  	;	Response Addr:  resd 1 ; response byte (pointer) address
  2856                                  	;			       ; (or callback -user service- address)	
  2857                                  
  2858                                  ;; Memory (swap) Data (11/03/2015)
  2859                                  ; 09/03/2015
  2860 00030560 <res 00000002>          swpq_count: resw 1 ; count of pages on the swap queue
  2861 00030562 <res 00000004>          swp_drv:    resd 1 ; logical drive description table address of the swap drive/disk
  2862 00030566 <res 00000004>          swpd_size:  resd 1 ; size of swap drive/disk (volume) in sectors (512 bytes). 		  				
  2863 0003056A <res 00000004>          swpd_free:  resd 1 ; free page blocks (4096 bytes) on swap disk/drive (logical)
  2864 0003056E <res 00000004>          swpd_next:  resd 1 ; next free page block
  2865 00030572 <res 00000004>          swpd_last:  resd 1 ; last swap page block	
  2866                                  
  2867 00030576 <res 00000002>          alignb 4
  2868                                  
  2869                                  ; 10/07/2015
  2870                                  ; 28/08/2014
  2871 00030578 <res 00000004>          error_code:	resd 1
  2872                                  ; 29/08/2014
  2873 0003057C <res 00000004>          FaultOffset: 	resd 1
  2874                                  ; 21/09/2015
  2875 00030580 <res 00000004>          PF_Count:	resd 1	; total page fault count
  2876                                  		       	; (for debugging - page fault analyze)
  2877                                  		 	; 'page_fault_handler' (memory.inc)
  2878                                  			; 'sysgeterr' (u9.s)
  2879                                  
  2880                                  ; 29/04/2016 (TRDOS 386 = TRDOS v2.0)
  2881                                  ; 22/08/2015 (Retro UNIX 386 v1)
  2882                                  buffer: 
  2883 00030584 <res 00000008>          	resb	8 
  2884                                  readi_buffer:
  2885 0003058C <res 00000200>          	resb 	512
  2886 0003078C <res 00000008>          	resb	8
  2887                                  writei_buffer:
  2888 00030794 <res 00000200>          	resb	512	
  2889                                  ; 24/10/2016
  2890 00030994 <res 00000008>          	resb	8 
  2891                                  rw_buffer:
  2892 0003099C <res 00000800>          	resb 	2048  ; general purposed, r/w sector buffer
  2893                                  
  2894                                  bss_end:
  2895                                  
  2896                                  ; 27/12/2013
  2897                                  _end:  ; end of kernel code
