;将FFH送存到内存1000H,1001H,1002H,1003H,1004H单元.
data segment
h1 db 0ffh
h2 dw 1000h
data ends
code segment
assume cs:code,ds:data,es:data
start:mov ax,data 
      mov ds,ax
      mov es,ax
      mov al,h1
      mov di,h2
      mov cx,5
      cld
      rep stosb ;al-->[di],di+1-->di
code  ends
      end start