AL,1FHР TEST AL,02HР JZ H1Р TEST AL,04HР JZ H2Р TEST AL,08HР JZ H3Р TEST AL,10HР JZ H4Р JMP AGAIN2Р H1: MOV AL,06H ;显示"1"Р OUT PORT5_C,ALР MOV CX,10Р A0: CALL DELAY ;调用延时子程序Р LOOP A0Р JMP EXITР H2: MOV AL,5BH ; 显示2Р OUT PORT5_C,ALР MOV CX,10Р A1: CALL DELAYР LOOP A1Р JMP EXITР H3: MOV AL,4FH ; 显示3Р OUT PORT5_C,ALР MOV CX,10Р A2: CALL DELAYР LOOP A2Р JMP EXITР H4: MOV AL,66H ; 显示4Р OUT PORT5_C,ALР MOV CX,10Р A3: CALL DELAYР LOOP A3Р JMP EXITР DELAY PROC NEAR ; 延时程序Р PUSH BXР PUSH CXР MOV BX,1000Р DEL1: MOV CX,100Р DEL2: LOOP DEL2Р DEC BXР JNZ DEL1Р POP CXР POP BXР RETР DELAY ENDPР EXIT: MOV AL,1 ;8253 GATE2有效,扬声器响Р OUT PORT5_B,ALР CALL DELAY ;延时Р MOV AL,0 ;8253 GATE2无效,扬声器不响Р OUT PORT5_B,ALР MOV AL,3FH ;数码管显示"0"Р OUT PORT5_C,ALР JMP STARTР MOV AH,4CHР INT 21HР CODE ENDSР END STARTР七、实验结果截图
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