assume cs:code,da:data
data segment
  db 'welcome to wasm!'
  db 16 dup (0)
data ends

code segment

start: mov ax,data
       mov ds,ax
       mov es,ax; 首先配置movsb的两个地址
       mov cx 16; 传送16次
       mov si,0;
       mov di,16;
       cld
       rep movsb
code ends

end start