This is a beginner question, so I apologise if it seems dumb --
I've been studying various assembly programs and I've noticed that many
of them invoke an assembler directive, "MACRO".

Now from what I can see (and perhaps I'm missing something here), they
seem to fill essentially the same role as a subroutine.  That is, they're
a predefined set of commands, which at some point in your program, you
would have to, well, *define*.  It seems to me that doesn't really save
you much work over just calling a subroutine, which you also write out.

Obviously, MACROs must have some good reason for existing, otherwise,
why would anyone use them?  So my question is, what's the difference
between a MACRO, and just using a subroutine?  Why would one choose one
over the other in a given situation?

Thanks for any clues!

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu