7ch中断代码如下:
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 ax,0
mov es,ax
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 lpret
add [bp+2],bx
lpret:pop bp
iret
lpend:nop
code ends
end start
//////////////////////////////////////////////////////////////////////////////
运用7ch中断完成的程序如下:
assume cs:code,ds:data
data segment
db 'conversation',0
data ends
code segment
start:mov ax,data
mov ds,ax
mov si,0
mov ax,0b800h
mov es,ax
mov di,12*160
s:cmp byte ptr [si],0
je ok
mov al,[si]
mov es:[di],al
inc si
add di,2
mov bx,offset s-offset ok
int 7ch
ok:mov ax,4c00h
int 21h
code ends
end start
/////////////////////////////////////////////////////////////////////
我都编译后，先运行7ch中断例程,然后再运算调用程序,为什么没反应? |
