帮忙看看怎么错了，纠结了3天了，求你了！

assume cs:code,ds:xinyi,ss:start
xinyi segment
db 'welcome to masm!'
db 0ah,2ch,79h
xinyi ends

start segment
dw 0,0,0,0,0,0,0,0
start ends

code segment
data:mov ax,start
mov ss,ax
mov ax,10h
mov sp,ax
mov di,0
mov bx,16
mov si,0
mov ax,xinyi
mov ds,ax

s: mov ax,[bx]
push ax

 mov ax,[di]
 push ax

 mov dx,0b800h
 mov ds,dx
 pop ax
 mov [si],ax
 inc si
 pop ax
 mov [si],ax
 inc di
 loop s
 inc bx
 jmp short s

 mov ah, 0
     int 16h

 mov ax,4c00h
 int 21h

code ends
end data

帮忙看下怎么错了
我想在屏幕上显示welcome to masm！

问题已解决，打扰了，谢谢