目录

实验任务

  1. 实验内容、程序清单及运行结果

编写0号中断的处理程序（课本实验12）

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assume cs:code
code segment
    start:  
            mov  ax,cs
            mov  ds,ax
            mov  si,offset do
            mov  ax,0
            mov  es,ax
            mov  di,200h
            mov  cx,offset doend-offset do    ;安装中断例程
            cld
            rep  movsb
            mov  word ptr es:[0],200h
            mov  word ptr es:[2],0            ;设置中断向量表
            mov  dx,0ffffh
            mov  bx,1                         ;测试一下
            div  bx
            mov  ax,4c00h
            int  21h
    do:     jmp  short dostart
            db   'divide error!'
    dostart:
            mov  ax,0
            mov  ds,ax
            mov  si,202h
            mov  ax,0b800h
            mov  es,ax
            mov  di,160*10+80
            mov  cx,13
    s:      
            mov  al,ds:[si]
            mov  ah,2
            mov  es:[di],ax
            inc  si
            inc  di
            inc  di
            loop s
            mov  ax,4c00h
            int  21h
    doend:  nop
code ends
end start

结果：