问题描述

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

以下有几个小程序

  CODE SEGMENTASSUME CS:CODESTART:MOV AL89H      MOV DX0073H      OUT DXALS:    MOV DX0072H      IN ALDX      MOV DX0071H      OUT DXAL      JMP S      CODE ENDS      END START相反CODE SEGMENTASSUME CS:CODESTART:MOV AL89H      MOV DX0073H      OUT DXALS:    MOV DX0072H      IN ALDX      NOT AL      MOV DX0071H      OUT DXAL      JMP S      CODE ENDS      END START左CODE SEGMENTASSUME CS:CODESTART:MOV AL89H      MOV DX0073H      OUT DXAL      MOV AL0FEHS:    MOV DX0071H      OUT DXAL      ROL AL1      MOV CX0FFFFH      DELAY:LOOP DELAY      JMP S      CODE ENDS      END START右CODE SEGMENTASSUME CS:CODESTART:MOV AL89H      MOV DX0073H      OUT DXAL      MOV AL0FEHS:    MOV DX0071H      OUT DXAL      ROR AL1      MOV CX0FFFFH      DELAY:LOOP DELAY      JMP S      CODE ENDS      END START+1:CODE SEGMENTASSUME CS:CODESTART:MOV AL89H      MOV DX0073H      OUT DXAL      MOV AL0FEHS:    MOV DX0071H      OUT DXAL      DEC AL      MOV CX0FFFFH      DELAY:LOOP DELAY      JMP S      CODE ENDS      END START-1:CODE SEGMENTASSUME CS:CODESTART:MOV AL89H      MOV DX0073H      OUT DXAL      MOV AL0FEHS:    MOV DX0071H      OUT DXAL      INC AL      MOV CX0FFFFH      DELAY:LOOP DELAY      JMP S      CODE ENDS      END START

解决方案

http://wenku.baidu.com/link?url=F17EErj0iNuAWM3UpOne385uwPqV2ItF7rywSSkgSl7ewtnwf5PxDhtNF9bFwPpnCYlYkGGox0uHSBXKcdW1HIXKGWPulBt8_vpqWZ4cLTS
http://www.docin.com/p-686994948.html