;在内存单元a1存放一双字节被除数，a2单元存放一单字节除数，
;求其商和余数并分别存入a3和a4单元中。
data segment
a1 dw 2000
a2 db 10
a3 dw 0
a4 dw 0
data ends
code segment
assume cs:code,ds:data
start: mov ax,data
       mov ds,ax
       mov ax,a1
       mov bl,a2
       cmp ah,bl
       jb j1
       xor dx,dx
       xor bh,bh
       div bx
       mov a3,ax
       mov a4,dx
       jmp stop
j1:    div bl
       mov byte ptr a3,al
       mov byte ptr a4,ah
stop:  mov ah,4ch
       int 21h
code   ends
       end start