Division interrupt handler

Collect

assume cs:code,ss:stack; the key is to handle the interrupt layer by layer return

stack segment
dw 16 dup(0)
stack ends

code segment
start:
mov ax,cs
mov ds,ax
mov ax,stack
mov ss,ax
mov sp,28h
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 es,ax
mov word ptr es:[0*4],200h
mov word ptr es:[0*4+2],0
call s1
mov ax,004ch
int 21h
do0:jmp short do0start
   db "divvide error!"
do0start: mov ax,cs
          mov ds,ax
     mov si,202h
     mov ax,0b800h
     mov es,ax
     mov di,3*160+2*2
     mov cx,13
     mov bl,5
   s0:mov al,[si]
      mov es:[di],al
      inc di
      mov es:[di],bl
      inc si
      inc di
    loop s0
    mov ax,004ch
    int 21h

       do0end:nop
     s1: mov ax,0ffffh
      mov dx,1
      mov bx,1
      div bx
      ret
   code ends

Reference address：Division interrupt handler - asm

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