说明: DATA SEGMENT TAB DB 3FH,06H,5BH,4FH,66H,6DH,7DH ;0~6的段码(字形码) DATA ENDS CODE SEGMENT ASSUME CS:CODE DS:DATA START: MOV AL,98H OUT 06H,AL XOR AL,AL OUT 02H,AL OUT 04H,AL ;初始化8255 LOPM: IN AL,04H ;检测开始键 TEST AL,80H ;检测C口的PC7端 JZ LOPM JNZ LOP1 ;开关打开,继续执
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