接口与汇编。我有如下几个简单的程序，我想是实现如图功能，8255多分支

Question

以下有几个小程序

  CODE SEGMENT
ASSUME CS:CODE
START:MOV AL,89H
      MOV DX,0073H
      OUT DX,AL
S:    MOV DX,0072H
      IN AL,DX
      MOV DX,0071H
      OUT DX,AL
      JMP S
      CODE ENDS
      END START
相反
CODE SEGMENT
ASSUME CS:CODE
START:MOV AL,89H
      MOV DX,0073H
      OUT DX,AL
S:    MOV DX,0072H
      IN AL,DX
      NOT AL
      MOV DX,0071H
      OUT DX,AL
      JMP S
      CODE ENDS
      END START
左
CODE SEGMENT
ASSUME CS:CODE
START:MOV AL,89H
      MOV DX,0073H
      OUT DX,AL
      MOV AL,0FEH
S:    MOV DX,0071H
      OUT DX,AL
      ROL AL,1
      MOV CX,0FFFFH
      DELAY:LOOP DELAY
      JMP S
      CODE ENDS
      END START


右
CODE SEGMENT
ASSUME CS:CODE
START:MOV AL,89H
      MOV DX,0073H
      OUT DX,AL
      MOV AL,0FEH
S:    MOV DX,0071H
      OUT DX,AL
      ROR AL,1
      MOV CX,0FFFFH
      DELAY:LOOP DELAY
      JMP S
      CODE ENDS
      END START

+1:
CODE SEGMENT
ASSUME CS:CODE
START:MOV AL,89H
      MOV DX,0073H
      OUT DX,AL
      MOV AL,0FEH
S:    MOV DX,0071H
      OUT DX,AL
      DEC AL
      MOV CX,0FFFFH
      DELAY:LOOP DELAY
      JMP S
      CODE ENDS
      END START
-1:
CODE SEGMENT
ASSUME CS:CODE
START:MOV AL,89H
      MOV DX,0073H
      OUT DX,AL
      MOV AL,0FEH
S:    MOV DX,0071H
      OUT DX,AL
      INC AL
      MOV CX,0FFFFH
      DELAY:LOOP DELAY
      JMP S
      CODE ENDS
      END START

Answer 1

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http://www.docin.com/p-686994948.html