【中断例程】实现loop
assume cs:code
code segment
start:
mov ax,0
mov es,ax
mov di,200h
mov ax,cs
mov ds,ax
mov si,offset lp
mov cx,offset lp_end - 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
dec cx
jcxz lp_ret
mov bp,sp
add [bp+2],bx ; 修改ip
lp_ret:
pop bp
iret
lp_end:
nop
code ends
end start