I do not have my notes from way back, but...

Have you read this?
http://www.microchip.com/stellent/id...pnote=en012140
Page 15 has
PALM OS SERIAL MANAGER
PROGRAMMING

Go here
https://pdn.palm.com/regac/pdn/page?...ICAL_RESOURCES
and look for
Public Access
Palm Developer Guide,
Palm OS Platform
Palm Develop Guide,
Windows Mobile Platform