I have only tried portable trackballs (which aren't exactly inexpensive),
but I had no problem with either the Logitech Portable Trackman or the
Appoint Thumbelina working with the UltraLite. I wouldn't expect that you'd
have trouble with any MS-compatible mouse. There is a potential for
problems if you use one of those parallel-port-connected hard disks
at the same time you are using a mouse (or anything else on COM1, for that
matter), but it is a problem with the hard disk driver and not with the
mouse driver.
--
-Brian Smithson
Motorola Inc., Computer Group, Commercial Systems Division
10700 N. De Anza Boulevard, Cupertino, CA 95014 USA, (408)366-4104
brian@csd.mot.com, {apple | pyramid}!motcsd!brian