mirror of
https://github.com/microsoft/MS-DOS.git
synced 2024-11-29 17:15:47 +00:00
838 lines
22 KiB
NASM
838 lines
22 KiB
NASM
TITLE DEBUGger for MS-DOS
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; DEBUG-86 8086 debugger runs under 86-DOS version 2.30
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;
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; Modified 5/4/82 by AaronR to do all I/O direct to devices
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; Runs on MS-DOS 1.28 and above
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; REV 1.20
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; Tab expansion
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; New device interface (1.29 and above)
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; REV 2.0
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; line by line assembler added by C. Peters
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; REV 2.1
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; Uses EXEC system call
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; REV 2.2
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; Ztrace mode by zibo.
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; Fix dump display to indent properly
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; Parity nonsense by zibo
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;
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; REV 2.3
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; Split into seperate modules to allow for
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; assembly on an IBM PC
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;
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.xlist
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.xcref
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INCLUDE DEBEQU.ASM
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INCLUDE DOSSYM.ASM
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.cref
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.list
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IF SYSVER
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; Structure for system call 72
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SYSINITVAR STRUC
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DPBHEAD DD ? ; Pointer to head of DPB-FAT list
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sft_addr DD ? ; Pointer to first FCB table
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; The following address points to the CLOCK device
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BCLOCK DD ?
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; The following address is used by DISKSTATCHK it is always
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; points to the console input device header
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BCON DD ? ; Console device entry points
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NUMIO DB 0 ; Number of disk tables
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MAXSEC DW 0 ; Maximum allowed sector size
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BUFFHEAD DD ?
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DEVHEAD DD ?
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SYSINITVAR ENDS
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ENDIF
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CODE SEGMENT PUBLIC 'CODE'
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CODE ENDS
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CONST SEGMENT PUBLIC BYTE
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EXTRN USER_PROC_PDB:WORD,STACK:BYTE,CSSAVE:WORD,DSSAVE:WORD
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EXTRN SPSAVE:WORD,IPSAVE:WORD,LINEBUF:BYTE,QFLAG:BYTE
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EXTRN NEWEXEC:BYTE,HEADSAVE:WORD,LBUFSIZ:BYTE,BACMES:BYTE
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EXTRN BADVER:BYTE,ENDMES:BYTE,CARRET:BYTE,ParityMes:BYTE
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IF IBMVER
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EXTRN DSIZ:BYTE,NOREGL:BYTE,DISPB:WORD
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ENDIF
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IF SYSVER
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EXTRN CONFCB:BYTE,POUT:DWORD,COUT:DWORD,CIN:DWORD,IOBUFF:BYTE
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EXTRN IOADDR:DWORD,IOCALL:BYTE,IOCOM:BYTE,IOSTAT:WORD,IOCNT:WORD
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EXTRN IOSEG:WORD,COLPOS:BYTE,BADDEV:BYTE,BADLSTMES:BYTE
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EXTRN LBUFFCNT:BYTE,PFLAG:BYTE
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ENDIF
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CONST ENDS
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DATA SEGMENT PUBLIC BYTE
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EXTRN PARSERR:BYTE,DATAEND:WORD,ParityFlag:BYTE,DISADD:BYTE
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EXTRN ASMADD:BYTE,DEFDUMP:BYTE,BYTEBUF:BYTE
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DATA ENDS
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DG GROUP CODE,CONST,DATA
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CODE SEGMENT PUBLIC 'CODE'
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ASSUME CS:DG,DS:DG,ES:DG,SS:DG
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PUBLIC RESTART,SET_TERMINATE_VECTOR,DABORT,TERMINATE,COMMAND
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PUBLIC FIND_DEBUG,CRLF,BLANK,TAB,OUT,INBUF,SCANB,SCANP
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PUBLIC PRINTMES,RPRBUF,HEX,OUTSI,OUTDI,OUT16,DIGIT,BACKUP,RBUFIN
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IF SYSVER
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PUBLIC SETUDEV,DEVIOCALL
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EXTRN DISPREG:NEAR,IN:NEAR
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ENDIF
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EXTRN PERR:NEAR,COMPARE:NEAR,DUMP:NEAR,ENTER:NEAR,FILL:NEAR
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EXTRN GO:NEAR,INPUT:NEAR,LOAD:NEAR,MOVE:NEAR,NAME:NEAR
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EXTRN REG:NEAR,SEARCH:NEAR,DWRITE:NEAR,UNASSEM:NEAR,ASSEM:NEAR
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EXTRN OUTPUT:NEAR,ZTRACE:NEAR,TRACE:NEAR,GETHEX:NEAR,GETEOL:NEAR
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EXTRN PREPNAME:NEAR,DEFIO:NEAR,SKIP_FILE:NEAR,DEBUG_FOUND:NEAR
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EXTRN TrapParity:NEAR,ReleaseParity:NEAR
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ORG 100H
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START:
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DEBUG:
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JMP SHORT DSTRT
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HEADER DB "Vers 2.30"
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DSTRT:
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DOSVER_HIGH EQU 0200H ; 2.00 in hex
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MOV AH,GET_VERSION
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INT 21H
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XCHG AH,AL ; Turn it around to AH.AL
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CMP AX,DOSVER_HIGH
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JAE OKDOS
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GOTBADDOS:
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MOV DX,OFFSET DG:BADVER
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MOV AH,STD_CON_STRING_OUTPUT
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INT 21H
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INT 20H
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OKDOS:
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CALL TrapParity ; scarf up those parity guys
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MOV AH,GET_CURRENT_PDB
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INT 21H
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MOV [USER_PROC_PDB],BX ; Initially set to DEBUG
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IF SYSVER
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MOV [IOSEG],CS
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ENDIF
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MOV SP,OFFSET DG:STACK
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MOV [PARSERR],AL
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MOV AH,GET_IN_VARS
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INT 21H
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IF SYSVER
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LDS SI,ES:[BX.BCON]
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MOV WORD PTR CS:[CIN+2],DS
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MOV WORD PTR CS:[CIN],SI
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MOV WORD PTR CS:[COUT+2],DS
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MOV WORD PTR CS:[COUT],SI
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PUSH CS
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POP DS
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MOV DX,OFFSET DG:CONFCB
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MOV AH,FCB_OPEN
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INT 21H
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OR AL,AL
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JZ GOTLIST
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MOV DX,OFFSET DG:BADLSTMES
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CALL RPRBUF
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CALL RBUFIN
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CALL CRLF
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MOV CL,[LBUFFCNT]
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OR CL,CL
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JZ NOLIST1 ; User didn't specify one
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XOR CH,CH
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MOV DI,OFFSET DG:(CONFCB + 1)
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MOV SI,OFFSET DG:LINEBUF
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REP MOVSB
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MOV DX,OFFSET DG:CONFCB
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MOV AH,FCB_OPEN
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INT 21H
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OR AL,AL
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JZ GOTLIST ; GOOD
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MOV DX,OFFSET DG:BADDEV
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CALL RPRBUF
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NOLIST1:
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MOV WORD PTR [POUT+2],CS
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MOV WORD PTR [POUT],OFFSET DG:LONGRET
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JMP NOLIST
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XXX PROC FAR
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LONGRET:RET
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XXX ENDP
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ENDIF
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GOTLIST:
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IF SYSVER
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MOV SI,DX
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LDS SI,DWORD PTR DS:[SI.fcb_FIRCLUS]
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MOV WORD PTR CS:[POUT+2],DS
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MOV WORD PTR CS:[POUT],SI
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ENDIF
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NOLIST:
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MOV AX,CS
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MOV DS,AX
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MOV ES,AX
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; Code to print header
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; MOV DX,OFFSET DG:HEADER
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; CALL RPRBUF
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CALL SET_TERMINATE_VECTOR
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IF SETCNTC
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MOV AL,23H ; Set vector 23H
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MOV DX,OFFSET DG:DABORT
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INT 21H
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ENDIF
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MOV DX,CS ; Get DEBUG's segment
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MOV AX,OFFSET DG:DATAEND + 15 ; End of debug
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SHR AX,1 ; Convert to segments
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SHR AX,1
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SHR AX,1
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SHR AX,1
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ADD DX,AX ; Add siz of debug in paragraphs
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MOV AH,CREATE_PROCESS_DATA_BLOCK ; create program segment just after DEBUG
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INT 21H
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MOV AX,DX
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MOV DI,OFFSET DG:DSSAVE
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CLD
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STOSW
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STOSW
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STOSW
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STOSW
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MOV WORD PTR [DISADD+2],AX
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MOV WORD PTR [ASMADD+2],AX
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MOV WORD PTR [DEFDUMP+2],AX
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MOV AX,100H
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MOV WORD PTR[DISADD],AX
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MOV WORD PTR[ASMADD],AX
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MOV WORD PTR [DEFDUMP],AX
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MOV DS,DX
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MOV ES,DX
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MOV DX,80H
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MOV AH,SET_DMA
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INT 21H ; Set default DMA address to 80H
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MOV AX,WORD PTR DS:[6]
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MOV BX,AX
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CMP AX,0FFF0H
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PUSH CS
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POP DS
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JAE SAVSTK
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MOV AX,WORD PTR DS:[6]
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PUSH BX
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MOV BX,OFFSET DG:DATAEND + 15
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AND BX,0FFF0H ; Size of DEBUG in bytes (rounded up to PARA)
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SUB AX,BX
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POP BX
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SAVSTK:
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PUSH BX
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DEC AX
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DEC AX
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MOV BX,AX
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MOV WORD PTR [BX],0
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POP BX
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MOV SPSAVE,AX
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DEC AH
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MOV ES:WORD PTR [6],AX
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SUB BX,AX
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MOV CL,4
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SHR BX,CL
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ADD ES:WORD PTR [8],BX
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IF IBMVER
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; Get screen size and initialize display related variables
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MOV AH,15
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INT 10H
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CMP AH,40
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JNZ PARSCHK
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MOV BYTE PTR DSIZ,7
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MOV BYTE PTR NOREGL,4
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MOV DISPB,64
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ENDIF
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PARSCHK:
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; Copy rest of command line to test program's parameter area
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MOV DI,FCB
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MOV SI,81H
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MOV AX,(PARSE_FILE_DESCRIPTOR SHL 8) OR 01H
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INT 21H
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CALL SKIP_FILE ; Make sure si points to delimiter
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CALL PREPNAME
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PUSH CS
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POP ES
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FILECHK:
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MOV DI,80H
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CMP BYTE PTR ES:[DI],0 ; ANY STUFF FOUND?
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JZ COMMAND ; NOPE
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FILOOP: INC DI
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CMP BYTE PTR ES:[DI],13 ; COMMAND LINE JUST SPACES?
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JZ COMMAND
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CMP BYTE PTR ES:[DI]," "
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JZ FILOOP
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CMP BYTE PTR ES:[DI],9
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JZ FILOOP
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CALL DEFIO ; WELL READ IT IN
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MOV AX,CSSAVE
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MOV WORD PTR DISADD+2,AX
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MOV WORD PTR ASMADD+2,AX
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MOV AX,IPSAVE
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MOV WORD PTR DISADD,AX
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MOV WORD PTR ASMADD,AX
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COMMAND:
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CLD
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MOV AX,CS
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MOV DS,AX
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MOV ES,AX
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MOV SS,AX
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MOV SP,OFFSET DG:STACK
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STI
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CMP [ParityFlag],0 ; did we detect a parity error?
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JZ GoPrompt ; nope, go prompt
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MOV [ParityFlag],0 ; reset flag
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MOV DX,OFFSET DG:ParityMes ; message to print
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MOV AH,STD_CON_STRING_OUTPUT; easy way out
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INT 21h ; blam
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GoPrompt:
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MOV AL,PROMPT
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CALL OUT
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CALL INBUF ; Get command line
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; From now and throughout command line processing, DI points
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; to next character in command line to be processed.
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CALL SCANB ; Scan off leading blanks
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JZ COMMAND ; Null command?
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LODSB ; AL=first non-blank character
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; Prepare command letter for table lookup
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SUB AL,"A" ; Low end range check
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JB ERR1
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CMP AL,"Z"-"A" ; Upper end range check
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JA ERR1
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SHL AL,1 ; Times two
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CBW ; Now a 16-bit quantity
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XCHG BX,AX ; In BX we can address with it
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CALL CS:[BX+COMTAB] ; Execute command
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JMP SHORT COMMAND ; Get next command
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ERR1: JMP PERR
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SET_TERMINATE_VECTOR:
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MOV AX,(SET_INTERRUPT_VECTOR SHL 8) OR 22H ; Set vector 22H
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MOV DX,OFFSET DG:TERMINATE
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INT 21H
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RET
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TERMINATE:
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CMP BYTE PTR CS:[QFLAG],0
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JNZ QUITING
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MOV CS:[USER_PROC_PDB],CS
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CMP BYTE PTR CS:[NEWEXEC],0
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JZ NORMTERM
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MOV AX,CS
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MOV DS,AX
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MOV SS,AX
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MOV SP,OFFSET DG:STACK
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MOV AX,[HEADSAVE]
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JMP DEBUG_FOUND
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NORMTERM:
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MOV DX,OFFSET DG:ENDMES
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JMP SHORT RESTART
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QUITING:
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MOV AX,(EXIT SHL 8)
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INT 21H
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DABORT:
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MOV DX,OFFSET DG:CARRET
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RESTART:
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MOV AX,CS
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MOV DS,AX
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MOV SS,AX
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MOV SP,OFFSET DG:STACK
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CALL RPRBUF
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JMP COMMAND
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IF SYSVER
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SETUDEV:
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MOV DI,OFFSET DG:CONFCB
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MOV AX,(PARSE_FILE_DESCRIPTOR SHL 8) OR 01H
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INT 21H
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CALL USERDEV
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JMP DISPREG
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USERDEV:
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MOV DX,OFFSET DG:CONFCB
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MOV AH,FCB_OPEN
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INT 21H
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OR AL,AL
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JNZ OPENERR
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MOV SI,DX
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TEST BYTE PTR [SI.fcb_DEVID],080H ; Device?
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JZ OPENERR ; NO
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LDS SI,DWORD PTR [CONFCB.fcb_FIRCLUS]
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MOV WORD PTR CS:[CIN],SI
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MOV WORD PTR CS:[CIN+2],DS
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MOV WORD PTR CS:[COUT],SI
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MOV WORD PTR CS:[COUT+2],DS
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PUSH CS
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POP DS
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RET
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OPENERR:
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MOV DX,OFFSET DG:BADDEV
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CALL RPRBUF
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RET
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ENDIF
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; Get input line. Convert all characters NOT in quotes to upper case.
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INBUF:
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CALL RBUFIN
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MOV SI,OFFSET DG:LINEBUF
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MOV DI,OFFSET DG:BYTEBUF
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CASECHK:
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LODSB
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CMP AL,'a'
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JB NOCONV
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CMP AL,'z'
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JA NOCONV
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ADD AL,"A"-"a" ; Convert to upper case
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NOCONV:
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STOSB
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CMP AL,13
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JZ INDONE
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CMP AL,'"'
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JZ QUOTSCAN
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CMP AL,"'"
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JNZ CASECHK
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QUOTSCAN:
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MOV AH,AL
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KILLSTR:
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LODSB
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STOSB
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CMP AL,13
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JZ INDONE
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CMP AL,AH
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JNZ KILLSTR
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JMP SHORT CASECHK
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INDONE:
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MOV SI,OFFSET DG:BYTEBUF
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; Output CR/LF sequence
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CRLF:
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MOV AL,13
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CALL OUT
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MOV AL,10
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JMP OUT
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; Physical backspace - blank, backspace, blank
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BACKUP:
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MOV SI,OFFSET DG:BACMES
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; Print ASCII message. Last char has bit 7 set
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PRINTMES:
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LODS CS:BYTE PTR [SI] ; Get char to print
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CALL OUT
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SHL AL,1 ; High bit set?
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JNC PRINTMES
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RET
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; Scan for parameters of a command
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SCANP:
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CALL SCANB ; Get first non-blank
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CMP BYTE PTR [SI],"," ; One comma between params OK
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JNE EOLCHK ; If not comma, we found param
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INC SI ; Skip over comma
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; Scan command line for next non-blank character
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SCANB:
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PUSH AX
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SCANNEXT:
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LODSB
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CMP AL," "
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JZ SCANNEXT
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CMP AL,9
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JZ SCANNEXT
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DEC SI ; Back to first non-blank
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POP AX
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EOLCHK:
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CMP BYTE PTR [SI],13
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RET
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; Hex addition and subtraction
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HEXADD:
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MOV CX,4
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CALL GETHEX
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MOV DI,DX
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MOV CX,4
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CALL GETHEX
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CALL GETEOL
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PUSH DX
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ADD DX,DI
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CALL OUT16
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CALL BLANK
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CALL BLANK
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POP DX
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SUB DI,DX
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MOV DX,DI
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CALL OUT16
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JMP SHORT CRLF
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; Print the hex address of DS:SI
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OUTSI:
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MOV DX,DS ; Put DS where we can work with it
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CALL OUT16 ; Display segment
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MOV AL,":"
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CALL OUT
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MOV DX,SI
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JMP SHORT OUT16 ; Output displacement
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; Print hex address of ES:DI
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; Same as OUTSI above
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OUTDI:
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MOV DX,ES
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CALL OUT16
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MOV AL,":"
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CALL OUT
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MOV DX,DI
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; Print out 16-bit value in DX in hex
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OUT16:
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MOV AL,DH ; High-order byte first
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CALL HEX
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MOV AL,DL ; Then low-order byte
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; Output byte in AL as two hex digits
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HEX:
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MOV AH,AL ; Save for second digit
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; Shift high digit into low 4 bits
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PUSH CX
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MOV CL,4
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SHR AL,CL
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POP CX
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CALL DIGIT ; Output first digit
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MOV AL,AH ; Now do digit saved in AH
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DIGIT:
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AND AL,0FH ; Mask to 4 bits
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; Trick 6-byte hex conversion works on 8086 too.
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ADD AL,90H
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DAA
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ADC AL,40H
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DAA
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; Console output of character in AL. No registers affected but bit 7
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; is reset before output.
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IF SYSVER
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OUT:
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PUSH AX
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AND AL,7FH
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CMP AL,7FH
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JNZ NOTDEL
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MOV AL,8 ; DELETE same as backspace
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NOTDEL:
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CMP AL,9
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JZ TABDO
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CALL DOCONOUT
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CMP AL,0DH
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JZ ZEROPOS
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CMP AL,0AH
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JZ ZEROPOS
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CMP AL,8
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JNZ OOKRET
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MOV AL," "
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CALL DOCONOUT
|
||
MOV AL,8
|
||
CALL DOCONOUT
|
||
CMP BYTE PTR CS:[COLPOS],0
|
||
JZ NOTINC
|
||
DEC BYTE PTR CS:[COLPOS]
|
||
JMP NOTINC
|
||
ZEROPOS:
|
||
MOV BYTE PTR CS:[COLPOS],0FFH
|
||
OOKRET:
|
||
INC BYTE PTR CS:[COLPOS]
|
||
NOTINC:
|
||
TEST BYTE PTR CS:[PFLAG],1
|
||
JZ POPRET
|
||
CALL LISTOUT
|
||
POPRET:
|
||
POP AX
|
||
RET
|
||
|
||
TABDO:
|
||
MOV AL,CS:[COLPOS]
|
||
OR AL,0F8H
|
||
NEG AL
|
||
PUSH CX
|
||
MOV CL,AL
|
||
XOR CH,CH
|
||
JCXZ POPTAB
|
||
TABLP:
|
||
MOV AL," "
|
||
CALL OUT
|
||
LOOP TABLP
|
||
POPTAB:
|
||
POP CX
|
||
POP AX
|
||
RET
|
||
|
||
|
||
DOCONOUT:
|
||
PUSH DS
|
||
PUSH SI
|
||
PUSH AX
|
||
CONOWAIT:
|
||
LDS SI,CS:[COUT]
|
||
MOV AH,10
|
||
CALL DEVIOCALL
|
||
MOV AX,CS:[IOSTAT]
|
||
AND AX,200H
|
||
JNZ CONOWAIT
|
||
POP AX
|
||
PUSH AX
|
||
MOV AH,8
|
||
CALL DEVIOCALL
|
||
POP AX
|
||
POP SI
|
||
POP DS
|
||
RET
|
||
|
||
|
||
LISTOUT:
|
||
PUSH DS
|
||
PUSH SI
|
||
PUSH AX
|
||
LISTWAIT:
|
||
LDS SI,CS:[POUT]
|
||
MOV AH,10
|
||
CALL DEVIOCALL
|
||
MOV AX,CS:[IOSTAT]
|
||
AND AX,200H
|
||
JNZ LISTWAIT
|
||
POP AX
|
||
PUSH AX
|
||
MOV AH,8
|
||
CALL DEVIOCALL
|
||
POP AX
|
||
POP SI
|
||
POP DS
|
||
RET
|
||
|
||
DEVIOCALL:
|
||
PUSH ES
|
||
PUSH BX
|
||
PUSH CS
|
||
POP ES
|
||
MOV BX,OFFSET DG:IOCALL
|
||
MOV CS:[IOCOM],AH
|
||
MOV WORD PTR CS:[IOSTAT],0
|
||
MOV WORD PTR CS:[IOCNT],1
|
||
MOV CS:[IOBUFF],AL
|
||
MOV WORD PTR CS:[IOADDR+2],DS
|
||
MOV AX,[SI+6]
|
||
MOV WORD PTR CS:[IOADDR],AX
|
||
CALL DWORD PTR CS:[IOADDR]
|
||
MOV AX,[SI+8]
|
||
MOV WORD PTR CS:[IOADDR],AX
|
||
CALL DWORD PTR CS:[IOADDR]
|
||
MOV AL,CS:[IOBUFF]
|
||
POP BX
|
||
POP ES
|
||
RET
|
||
ELSE
|
||
|
||
OUT:
|
||
PUSH DX
|
||
PUSH AX
|
||
AND AL,7FH
|
||
MOV DL,AL
|
||
MOV AH,2
|
||
INT 21H
|
||
POP AX
|
||
POP DX
|
||
RET
|
||
ENDIF
|
||
|
||
|
||
IF SYSVER
|
||
RBUFIN:
|
||
PUSH AX
|
||
PUSH ES
|
||
PUSH DI
|
||
PUSH CS
|
||
POP ES
|
||
MOV BYTE PTR [LBUFFCNT],0
|
||
MOV DI,OFFSET DG:LINEBUF
|
||
FILLBUF:
|
||
CALL IN
|
||
CMP AL,0DH
|
||
JZ BDONE
|
||
CMP AL,8
|
||
JZ ECHR
|
||
CMP AL,7FH
|
||
JZ ECHR
|
||
CMP BYTE PTR [LBUFFCNT],BUFLEN
|
||
JAE BFULL
|
||
STOSB
|
||
INC BYTE PTR [LBUFFCNT]
|
||
JMP SHORT FILLBUF
|
||
|
||
BDONE:
|
||
STOSB
|
||
POP DI
|
||
POP ES
|
||
POP AX
|
||
RET
|
||
|
||
BFULL:
|
||
MOV AL,8
|
||
CALL OUT
|
||
MOV AL,7
|
||
CALL OUT
|
||
JMP SHORT FILLBUF
|
||
|
||
ECHR:
|
||
CMP DI,OFFSET DG:LINEBUF
|
||
JZ FILLBUF
|
||
DEC DI
|
||
DEC BYTE PTR [LBUFFCNT]
|
||
JMP SHORT FILLBUF
|
||
ELSE
|
||
|
||
RBUFIN:
|
||
PUSH AX
|
||
PUSH DX
|
||
MOV AH,10
|
||
MOV DX,OFFSET DG:LBUFSIZ
|
||
INT 21H
|
||
POP DX
|
||
POP AX
|
||
RET
|
||
ENDIF
|
||
|
||
|
||
IF SYSVER
|
||
RPRBUF:
|
||
PUSHF
|
||
PUSH AX
|
||
PUSH SI
|
||
MOV SI,DX
|
||
PLOOP:
|
||
LODSB
|
||
CMP AL,"$"
|
||
JZ PRTDONE
|
||
CALL OUT
|
||
JMP SHORT PLOOP
|
||
PRTDONE:
|
||
POP SI
|
||
POP AX
|
||
POPF
|
||
RET
|
||
ELSE
|
||
|
||
RPRBUF:
|
||
MOV AH,9
|
||
INT 21H
|
||
RET
|
||
ENDIF
|
||
|
||
; Output one space
|
||
|
||
BLANK:
|
||
MOV AL," "
|
||
JMP OUT
|
||
|
||
; Output the number of blanks in CX
|
||
|
||
TAB:
|
||
CALL BLANK
|
||
LOOP TAB
|
||
RET
|
||
|
||
; Command Table. Command letter indexes into table to get
|
||
; address of command. PERR prints error for no such command.
|
||
|
||
COMTAB DW ASSEM ; A
|
||
DW PERR ; B
|
||
DW COMPARE ; C
|
||
DW DUMP ; D
|
||
DW ENTER ; E
|
||
DW FILL ; F
|
||
DW GO ; G
|
||
DW HEXADD ; H
|
||
DW INPUT ; I
|
||
DW PERR ; J
|
||
DW PERR ; K
|
||
DW LOAD ; L
|
||
DW MOVE ; M
|
||
DW NAME ; N
|
||
DW OUTPUT ; O
|
||
IF ZIBO
|
||
DW ZTRACE
|
||
ELSE
|
||
DW PERR ; P
|
||
ENDIF
|
||
DW QUIT ; Q (QUIT)
|
||
DW REG ; R
|
||
DW SEARCH ; S
|
||
DW TRACE ; T
|
||
DW UNASSEM ; U
|
||
DW PERR ; V
|
||
DW DWRITE ; W
|
||
IF SYSVER
|
||
DW SETUDEV ; X
|
||
ELSE
|
||
DW PERR
|
||
ENDIF
|
||
DW PERR ; Y
|
||
DW PERR ; Z
|
||
|
||
QUIT:
|
||
INC BYTE PTR [QFLAG]
|
||
MOV BX,[USER_PROC_PDB]
|
||
FIND_DEBUG:
|
||
IF NOT SYSVER
|
||
MOV AH,SET_CURRENT_PDB
|
||
INT 21H
|
||
ENDIF
|
||
CALL ReleaseParity ; let system do normal parity stuff
|
||
MOV AX,(EXIT SHL 8)
|
||
INT 21H
|
||
|
||
CODE ENDS
|
||
END START
|
||
|