3.asm

来自「几个接口实验的代码。内含：8253、8255、8237、8251、DA0832、」· 汇编 代码 · 共 34 行

data segment
    w db ?
    data ends
code segment
assume cs:code,ds:data
 start:
          mov ax,data
          mov ds,ax
	mov cx,30
	mov dx,221h
	mov al,0fch
aa:	mov dx,221h
	out dx,al
	call delay
	rol al,01h
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.B0-B7 ---------- LED1-8
;8255.CS ------------- 220-227H