2012年自考微型計(jì)算機(jī)及接口技術(shù)題一_第4頁(yè)
方式0，A口輸入，C口輸出，先將A口輸入的求反，
CODE SEGMENT
ASSUME CS:CODE
START:
MOV DX,28BH
MOV AL,90H
OUT DX,AL
INPUT: MOV DX,288H
IN AL,DX
NOT AL ;
MOV DX,28AH
OUT DX,AL
MOV AH,1
INT 16H
JZ INPUT
MOV AH,4CH
INT 21H
CODE ENDS
END START
--------------------
CODE SEGMENT
ASSUME CS:CODE
START:
MOV DX,28BH
MOV AL,8BH
OUT DX,AL
INPUT: MOV DX,28AH
IN AL,DX
MOV DX,288H
OUT DX,AL
MOV AH,1
INT 16H
JZ INPUT
MOV AH,4CH
INT 21H
CODE ENDS
END START
責(zé)編：snrvge
