微机原理与接口技术实验指导(12学时)(14)

ADD BX,AX MOV AL,[BX] POP BX MOV DX,PB OUT DX,AL MOV AL,CL MOV DX,PA OUT DX,AL PUSH CX

DIS2: MOV CX,00A0H

LOOP $ POP CX

CMP CL,0FEH ;01H JZ LX1 MOV AL,0FFH ;00H MOV DX,PA OUT DX,AL INC BX

ROR CL,1 ;SHR CL,1 JMP DIS1

LX1: MOV AL,0FFH

MOV DX,PB OUT DX,AL RET

BUF1: MOV BH,AH

CALL ZH MOV BUF+5,AL MOV BUF+4,AH MOV AL,BH CALL ZH MOV BUF,AH MOV BUF+1,AL MOV BUF+2,17H MOV BUF+3,17H RET

;-------------------------------------------------------- ZH: MOV BL,AL

MOV CL,4 ROL AL,CL AND AL,0FH MOV AH,AL MOV AL,BL AND AL,0FH RET