哪来的这么多错误呀?23个呢啊。。。
assume cs:code,ds:data
data segment
db 'Welcome to masm!',0
data ends
code segmnet
start: mov cl,2
mov ax,data
mov ds,ax
mov si,0
call show_str
mov ax,4c00h
int 21h
show_str:mov ax,0b800h
mov es,ax
mov di,0
mov bl,cl
s:mov cl,[si]
mov ch,0
jcxz ok
mov es:[di],cl
mov es:[di+1],bl
add di,2
inc si
jmp short s
ok:ret
code ends
end start