51.asm

微机8255并行口硬件实验 8255A的A口作为输入口

CODE SEGMENT
ASSUME  CS:CODE
ORG      100H

START: MOV      DX, 04A0H
             IN        AL,   DX 
              

          MOV   DX,   04B0 H  
          OUT     DX, AL 

JMP SATAT
CODE ENDS
END START