中断处理程序

assume cs:code

code segment

start:
                  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

                  mov ax, 0                                 ;设置中断向量表
                  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
       
                   mov ax, 0b800h
                   mov es, ax
                   mov di, 12*160+36*2       ;设置es:di指向显存空间的中间位置

                   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