I'm not going to comment on my size, so to the point.

If your code is:

          org   0
          ljmp  init
.
.
          org   00400h
init:     sjmp  $

which is a very useful program indeed, its size would be 5 bytes, but it would require more than 1kb of ROM because there is a large gap in it. I know you know Andy, but it might clear things up for the Arifs of this world.