assume cs:code

;代码段
code segment
     ;程序入口
     start:
           ;do0安装程序
           mov ax,cs
           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
           ;设置中断向量表
           mov ax,0
           mov es,ax
           mov word ptr es:[0*4],200h
           mov word ptr es:[0*4+2],0h
           ;测试效果
           mov ax,4444h
           mov cl,1
           div cl
           ;按任意键退出
           mov ah,1
           int 21h
           ;程序返回
           mov ah,43h
           int 21h
           
           ;中断处理程序
       do0:
           jmp short do0start
           db "divide error!"
       do0start:
                push ax
                push si
                push di
                push cx
                push ds
                push es
                
                mov ax,cs
                mov ds,ax
                mov si,202h
                mov ax,0b800h
                mov es,ax
                mov di,11*160+30*2
                
                mov cx,13
              s:
                mov al,[si]
                mov es:[di],al
                mov byte ptr es:[di+1],42h
                inc si
                add di,2
                loop s

                pop es
                pop ds
                pop cx
                pop di
                pop si
                pop ax
           ;中断处理程序返回
           iret
    do0end:nop
code ends

end start

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