这样写却调试不了。。。。原因何在啊???
assume cs:code
code segment
start:
mov ax,cs
mov ds,ax
mov si,offset sqr ;设置ds:si指向源地址
mov ax,0
mov es,ax
mov di,200h ;设置es:di指向0:200h
mov cx,offset sqrend-offset sqr ;设置字符传输长度
cld ;设置传输方向为正
rep movsb
mov ax,0 ;设置中断向量列表
mov es,ax
mov word ptr es:[7ch*4],200h
mov word ptr es:[7ch*4+2],0
mov ax,3456
int 7ch ;调用7ch中断
add ax,ax
adc dx,dx ;DX存放结果,将DX*2
sqr:
mul ax
iret
sqrend:
nop
mov ax,4c00h
int 21h
code ends
end start |