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MODEL SMALL
CODE
COMADDR DW 3F8H
COMLCR DW 3FBH
COMMCR DW 3FCH
COMIER DW 3F9H
COMLSR DW 3FDH
CONTRL DB 00H
INTSEG DW
INTOFF DW
RCVBYT DB
PUBLIC _ZJCOMSET
PUBLIC _ZJCOMSND
PUBLIC _ZJCOMIST
PUBLIC _ZJCOMRCV
_ZJCOMSET PROC NEAR
MOV DX,COMLCR
MOV AL,80H
OUT DX,AL
MOV DX,COMADDR
MOV AL,30H
OUT DX,AL
INC DX
MOV AL,00H
OUT DX,AL /*设置波特率*/
MOV DX,COMLCR
MOV AL,03H
OUT DX,AL
MOV DX,COMMCR
MOV AL,00H
OUT DX,AL
MOV DX,COMIER
MOV AL,00H
OUT DX,AL
RET
_ZJCOMSET ENDP
_ZJCOMSND PROC NEAR
PUSH BP
MOV BP,SP
L1: MOV DX,COMLSR
IN AL,DX
AND AL,20H
SUB AL,20H
JNZ L1
MOV DX, COMADDR
MOV AL,[BP+4]
OUT DX,AL
POP BP
RET
_ZJCOMSND ENDP
_ZJCOMIST PROC NEAR
PUSH DS
PUSH ES
MOV AL ,0CH
MOV AH,35H
INT 21H
MOV INTOFF ,BX
MOV BX,ES
MOV INTSEG,BX
CLI
MOV AL,0CH
MOV AH,25H
MOV DX,SEG INTSEV
MOV DS,DX
MOV DX,OFFSET INTSEV
INT 21H
POP ES
POP DS
MOV DX, COMMCR
MOV AL,08H
OUT DX,AL
MOV DX, COMIER
MOV AL,01H
OUT DX,AL
IN AL,21H
AND AL,0EFH
OUT 21H,AL
STI
RET
_ZJCOMIST ENDP
_ZJCOMRCV PROC NEAR
STI
LW:MOV AL,CONTRL
SUB AL,01H
JNZ LW
MOV CONTRL ,00H
MOV AL,RCVBYT
CLI
RET
_ZJCOMRCV ENDP
INTSEV PROC NEAR
PUSH CX
PUSH DX
PUSH SI
PUSH DI
PUSH DS
PUSH ES
STI
MOV CONTRL,01H
MOV DX,3F8
IN AL,DX
MOV RCVBYT ,AL
CLI
POP ES
POP DS
POP SI
POP DX
POP CX
MOV AL ,21H
OUT 20H,AL
IRET
INTSEV ENDP
END
这个程序还要怎么修改 才能让它能够编绎成功
[解决办法]
; 这个 ....
.MODEL SMALL
.CODE
...
INTSEG DW ?
INTOFF DW ?
RCVBYT DB ?
...
OUT DX,AL ; /*设置波特率*/
...
