王爽《汇编语言》实验13(2)

assume cs:code
code segment 
 start:mov ax,cs
       mov ds,ax
       mov si,offset xunhuan

       mov ax,0
       mov es,ax
       mov di,200h

       mov word ptr es:[7ch*4],200h
       mov word ptr es:[7ch*4+2],0

       mov  ax,4c00h
       int 21h

 xunhuan:push bp
         mov bp,sp
         dec cx
	 jcxz ok
         add [bp+2],bx
      ok:pop bp
         iret

code ends
end start