2018年自考微型计算机及接口技术题二
口地址:8253口址:280H----283H
8255口址:288H----28bH
程序如下:
code segment
assume cs:code
start: mov dx,283h
mov al,50h
out dx,al
mov dx,281h
mov al,0fh
out dx,al
inout mov dx,28bh
mov al,80h
out dx,al
mov dx,281h
in al,dx
and al,0fh
mov dx,28ah
out dx,al
mov ah,01h
int 16h
