;设内存1000H处放有两个3字节长的数据,求这两数的和(高位对高
;位,低位对低位),将结果放在这两数之后.再用串传送指令把被加
;数,加数,和传送到同一数据段1005H开始的区域.
data segment
org 1000h
h1 db 11H,22H,34H
h2 db 0AAH,0BBH,0CCH
h3 db 4 dup(?)
data ends
code segment
assume cs:code,ds:data,es:data
start:mov ax,data
      mov ds,ax
      mov es,ax
      lea si,h1
      lea di,h2
      lea bx,h3
      mov cx,3
      clc
l1:   mov al,[si]
      adc al,[di]
      mov [bx],al
      inc si
      inc di
      inc bx
      loop l1
      jnc j1
      mov byte ptr[bx],1
      jmp j2
j1:   dec bx
j2:   mov cx,bx
      lea si,h1
      sub cx,si      ;cx为数据长度
      mov di,1005h
      add si,cx
      add di,cx 
      inc cx          ;**
      std
      rep movsb
      mov ah,4ch
      int 21h
code  ends
      end start