div.asm

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.386p
Seg_Data  SEGMENT  use16
                        
   Prompt DB "                =========Test for Div 0=========",0dh,0ah,"======================Select between 0-1! Please====================",0dh,0ah,'$'
   NDiv   DB  "System Reseved Interrupt!",0dh,0ah,'$'
   CDiv   DB  "Customer Modified Interrupt!",0dh,0ah,'$'
   Seg_Data ENDS

Seg_Stack  SEGMENT  use16
      DW  512  dup  (?)
      Top  label  WORD
Seg_Stack  ENDS

Seg_Code SEGMENT use16
main proc far
     Assume  cs:Seg_Code , ds:Seg_Data , ss:Seg_Stack
 Start:
                 mov    ax ,  Seg_Stack
                 mov    ss ,  ax
                 mov    sp ,  offset Top
                 mov    ax ,  Seg_Data
                 mov    ds ,  ax
;========================================= 
                 mov ah,9
                 lea dx,Prompt
                 int 21h
again:           mov ah,0
                 int 16h
                 cmp al,'0'
                 jz normaldiv
                 cmp al,'1'
                 jz customdiv
                 jmp again
normaldiv:
                mov ah,9
                lea dx,NDiv
                int 21h
                mov bl,0
                div bl
customdiv:
                mov al,0
                mov ah,35h
                int 21h
                push bx
                push es
                mov ax,seg TestProc
                mov ds,ax
                mov dx,offset TestProc
                mov al,0
                mov ah,25h
                int 21h
                mov ax,1
                mov bl,0
                div bl
                pop ds
                pop dx
                mov al,0
                mov ah,25h
                int 21h
;=========================================
                mov ax,4c00h
                int 21h
main Endp
TestProc Proc near
      lea dx,CDiv
      mov ax,seg CDiv
      mov ds,ax
      mov ah,9
      int 21h
      pop ax
      add ax,2
      push ax
      iret
TestProc endp
Seg_Code  ENDS
  End  start