中断例程及其安装程序:
assume cs:code
code segment
start:mov ax,cs
mov ds,ax
mov si,offset lp
mov ax,0
mov es,ax
mov di,200h
mov cx,offset lpend-offset lp
cld
rep movsb
mov word ptr ES:[7ch*4],200h
mov word ptr ES:[7ch*4+2],0
mov ax,4c00h
int 21h
lp: push bp
mov bp,sp
dec cx
jcxz lp_ok
add [bp+2],bx
lp_ok:pop bp
iret
lpend:nop
code ends
end start