5.asm

几个接口实验的代码。内含：8253、8255、8237、8251、DA0832、AD0809等芯片的实验代码！

data segment
    w db ?
    data ends
code segment
assume cs:code,ds:data
start:
	mov cx,30
aa:	mov dx,213h
	mov al,80h
	out dx,al
	mov dx,213h
	mov al,0ah
	out dx,al
       call delay
       mov dx,213h
	mov al,0bh
	out dx,al
call delay
loop aa
mov ax,4c00h
int 21h
delay proc
      push cx
      mov ah,86h
      mov cx,7h
      mov dx,0a120h
      int 15h
      pop cx
      ret
delay endp 
code ends
end start

;线路:
;8255.CS ---------- 210-217H
;8255.C5 ---------- LED