s.asm

微机原理——接口应用编程源码

stack segment stack
dw 64 dup(?)
stack ends
data segment
data ends
code segment
assume cs:code,ds:data
start:mov ax,data
mov ds,ax
push ds
mov dx,63h
mov al,82h
out dx,al
A: mov dx,61h
in al,dx
mov dx,60h
out dx,al
jmp A
code ends
end start