汇编语言 实验12

assume cs:code

code segment
start:
        mov ax,code
        mov ds,ax
        mov si,offset do0
        mov ax,0
        mov es,ax
        mov di,200h
        mov cx,offset do0end-offset do0
        cld
        rep movsb

        mov ax,0
        mov ds,ax
        mov word ptr ds:[0],200h
        mov word ptr ds:[2],0

        mov ax,4c00h
        int 21h

   do0:
        jmp short do0start
   do0str:
        dw 1
        db 'divide error! '
   do0start:
        mov ax,cs
        mov ds,ax
        mov si,202h

        mov ax,0b800h
        mov es,ax
        mov di,7c8h
        mov cx,14
    ;    mov cx,ds:[202h]
   s:
        mov al,ds:[si+2]
        mov es:[di],al
        inc si
        add di,2
        loop s

        mov ax,4c00h
        int 21h

        mov ax,ds:[202h]
        inc ax
        mov ds:[202h],ax

        push cx
        mov cx,5
     ds0:
        push cx
        mov cx,0ffffh
     ds1:
        loop ds1
        pop cx
        loop ds0
        pop cx

        iret

   do0end:
        nop

code ends
end start

assume cs:code

code segment
start:
        mov ax,0
        mov bx,0
        div bx

        mov ax,4c00h
        int 21h

code ends
end start