cs push \ copy code segment to data segment
   ds pop

   cx 11 # mov

:> loop 
   :> msg
   dx msg mov
   dx cx add
   ah 9 # movb
   &h21 int
   
   cx dec
   loop jge

   0 .EXIT

msg <:
   : nl 13 outb! 10 outb! ;
   d" Hello World!" nl d" $"