汇编试验十二 编写0号中断的处理程序

assume cs:code

code segment
start:
    mov ax,cs
    mov ds,ax
    mov si,offset do0   ;ds:si指向源地址

    mov ax,0
    mov es,ax
    mov di,200h         ;es:di指向目的地址
    cld
    rep movsb

    mov ax,0
    mov es,ax
    mov word ptr es:[0*4],200h
    mov word ptr es:[0*4+2],0

    mov ax,4c00h
    int 21h

    do0: jmp short do0start
        db "overflow!"

    do0start:
        mov ax,cs
        mov ds,ax
        mov si,202h     ;ds:si指向字符串,复制到0:200处

        mov ax,0b800h
        mov es,ax
        mov di,12*160+36*2  ;显示位置

        mov cx,9
        s:
            mov al,[si]
            mov es:[di],al
            inc si
            add di,2
            loop s
        mov ax,4c00h
        int 21h
    do0end:nop
code ends
end start

assume cs:code

code segment
start:
mov ax,1000h
mov bh,1
div bh
code ends
end start