9jcb.asm

来自「几个接口实验的代码。内含：8253、8255、8237、8251、DA0832、」· 汇编 代码 · 共 25 行

code segment
   assume cs:code,ds:code
start:
    mov ax,code
    mov ds,ax
   
s1: 
    mov cx,1ffh  ;锯齿波
    mov al,0ffh
s4: mov dx,228h
    out dx,al
    mov dx,229h
    out dx,al
    inc al
    loop s4
    jmp s1

code     ends
   end     start