《微机原理与接口技术》课程设计报告

2Р INT 21H?;显示状态信息Р JMP AAРK3: MOV DX,IO8255A?;访问A0口Р IN AL,DXР AND AL,01HР JNZ S7Р JMP S6РS6: MOV DX,IO8255C?;访问C口Р MOV AL,PB?;进入状态S6Р OR AL,78HР OUT DX,ALР CALL DELAY10Р MOV AL,07HР OUT DX,ALР CALL DELAY10Р MOV AH,09HР MOV DX,OFFSET MES6Р INT 21H?;显示状态信息Р JMP AA?РS1: MOV DX,IO8255C?;访问C口Р MOV AL,PB?;进入状态S1Р OR AL,0CHР OUT DX,ALР CALL DELAY10Р MOV AL,0F0HР OUT DX,ALР CALL DELAY10Р MOV AL,03HР OUT DX,ALР CALL DELAY10Р MOV AL,0F0HР OUT DX,ALР CALL DELAY10Р MOV AL,0CHР OUT DX,ALР CALL DELAY10Р MOV AL,33HР OUT DX,ALР CALL DELAY10Р MOV AH,09HР MOV DX,OFFSET MES1Р INT 21H?;显示状态信息Р JMP AAРS3: MOV DX,IO8255C?;访问C口Р MOV AL,PB?;进入状态S3Р OR AL,20HР OUT DX,ALР CALL DELAY10Р MOV AL,80HР OUT DX,ALР CALL DELAY10Р MOV AL,01HР OUT DX,ALР CALL DELAY10Р MOV AH,09HР MOV DX,OFFSET MES3Р INT 21H?;显示状态信息Р JMP AA