虎书 哪位大哥有哦，买不到啊。有的给小弟发一个来！

assume cs:code,ds:data,ss:stack

data segment
    db 'welcome to masm!'
    db 02h,24h,71h
data ends

stack segment
  dw 8 dup(0)
stack ends

code segment
start: mov ax,data
       mov ds,ax
       mov si,0      
       mov cx,3
       mov ax,stack
       mov ss,ax
       mov sp,10h
       mov ax,0b872h
      s:
        mov es,ax
        push cx
        push ax
        mov cx,16
        mov bx,0
        mov di,0
          s0:mov al,[bx]
          mov es:[di],al
          mov al,[16+si]
          mov es:[di+1],al
          add bx,1
          add di,2
       loop s0
       pop ax
       add ax,0AH
       pop cx
       add si,1
     loop s
     mov ax,4c00h
     int 21h
code ends
end start