?? sy7-8255.asm
字號:
CODE SEGMENT
ASSUME CS:CODE
MAIN PROC FAR
START: MOV AL,89H
MOV DX,0C40BH
OUT DX,AL
MOV AL,10000100B
MOV DX,0C408H
OUT DX,AL
LOOP1: MOV AL,00100100B
OUT DX,AL
CALL DELAY
MOV CX,8
LOOP2: MOV AL,01000100B
OUT DX,AL
CALL DELAY
MOV AL,00000100B
OUT DX,AL
CALL DELAY
LOOP LOOP2
MOV AL,10000001B
OUT DX,AL
CALL DELAY
MOV CX,8
LOOP3: MOV AL,10000010B
OUT DX,AL
CALL DELAY
MOV AL,10000000B
OUT DX,AL
CALL DELAY
LOOP LOOP3
MOV AH,0BH
INT 21H
CMP AL,0
JZ LOOP1
; MOV AH,4CH
;INT 21H
MAIN ENDP
DELAY PROC NEAR
MOV CX,0FFFFH
LOOP4: MOV DX,0C403H
MOV AL,00110000B
OUT DX,AL
MOV DX,0C400H
MOV AL,0
OUT DX,AL
OUT DX,AL
LOOP LOOP4
RET
DELAY ENDP
CODE ENDS
END MAIN
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