Hi,
I am trying to select the addresses of several I/O ports ( COM, LPT1, MOUSE,
and VGA) for a new designed processor.
I want first to know, what are the general rules of I/O mapping.? Also, how
can I select a good mapping so that I can add other I/O in the future
expansion of the architecture.

Thank you for your help.

/Ben
UEC, IS
www.uec.ac.jp