PalmTops similar to the Sharp OZ-770

Most of these use Windows CE as their operating
system. You can find older HP 100lx and 200lx running
DOS, and Psion and Makos running Epoc. Some of these
PDA's run on AA batteries, and others have odd-sized
rechargeables. Battery life is never as good as that
of the OZ-770. All of these units are at least a trifle
larger than the OZ-770.

Sharp Mobilon HC-4100, HC-4500, HC-4600

Casio A-20

NEC Mobile Pro 400, 700, 750c

Hewlett Packard 320lx or 360lx

Phillips Velo 1, Velo 500

Compaq 2010c

Zaurus ZR-5800, and HERE

Psion Revo

Diamond Mako

LG Phenom 8MB Model, Express

All the the units mentioned above can be purchased
on EBay for less than $100, sometimes much less.
Condition ranges from defective to "new in the box."