功能描述：在汇编试验箱上四个七段管上静态显示1976
ps:下面代码中8255的A口送数据，B口选择七段管
CODES SEGMENT ASSUME CS:CODES START: MOV AL,10000000B MOV DX,606H OUT DX,AL A: MOV AL,11111011B MOV DX,602H OUT DX,AL MOV AL,00000110B MOV DX,600H OUT DX,AL CALL DELAY MOV AL,00000000B MOV DX,600H OUT DX,AL MOV AL,11110111B MOV DX,602H OUT DX,AL MOV AL,01101111B MOV DX,600H OUT DX,AL CALL DELAY MOV AL,00000000B MOV DX,600H OUT DX,AL MOV AL,11101111B MOV DX,602H OUT DX,AL MOV AL,00000111B MOV DX,600H OUT DX,AL CALL DELAY MOV AL,00000000B MOV DX,600H OUT DX,AL MOV AL,11011111B MOV DX,602H OUT DX,AL MOV AL,01111101B MOV DX,600H OUT DX,AL CALL DELAY MOV AL,00000000B MOV DX,600H OUT DX,AL JMP A DELAY: ;延时作用，让七段管充电 MOV CX,0FH AA2:PUSH AX POP AX LOOP AA2 RET CODES ENDS END START