sx.rar_8人抢答器_8路抢答器_抢答器_竞赛抢答器

MY_DATA SEGMENT P8255_A DW 0C400H P8255_B DW 0C401H P8255_C DW 0C402H P8255_MODE DW 0C403H KL DB ? LED DB 0C0H,09FH,0A4H,0B0H,099H,92H,82H,0F8H DB 080H,90H,88H,83H,0C6H,0A1H,86H,8EH MY_DATA ENDs MY_CODE SEGMENT ASSUME CS:MY_CODE, DS:MY_DATA START: MOV AX,MY_DATA MOV DS,AX MOV DX,P8255_MODE MOV AL,90H ;写8255控制字 OUT DX,AL START1: MOV CX,04H ;显示器个数 MOV KL,01H ;选中的显示器 START2: MOV DX,P8255_A IN AL,DX AND AL,80H JNZ START3 MOV DX,P8255_B MOV AL,0FFH OUT DX,AL JMP START2 START3: MOV DX,P8255_B MOV AL,FDH OUT DX,AL MOV DX,P8255_A IN AL,DX AND AL,7FH OR AL,AL ;比较是否为0 JZ START3 START4: MOV BL,0 MOV CX,7 SHR AL,1 JC START5 INC BL LOOP START4 MOV BL,0 JMP START4 START5: MOV DX,P8255_B MOV AL,FEH OUT DX,AL MOV AL,BL MOV AL,KL MOV DX,P8255_C MOV AL,LED[BX] OUT DX,AL JMP START2 EXIT: MOV AX,4C00H INT 21H MY_CODE ENDS END START