Simple Hello World..

[zerox55]

Hello.

I just started with assembly.
In my emulator (emu8086) this code work perfectly. But when i write it out to a floppy it doesn't work.

I know that if i write out one letter at time, it works.

Is it impossible to write this way?

#make_boot#
org 7c00h

jmp start

   msg db "Hello$"

start:
   mov ah, 09h
   mov dx, offset msg
   int 21h     

jmp $

Sorry for my English
Thanks.