On Wed, 18 May 2011, Evan Koblentz wrote:
TRS-80 Model 100 / PC-8201 / M-10 are all the same
machine underneath.
Rarest of that series is Kyocera's Kyotronic KC-85.
Some of the minor differences do matter, such as connection to the
Model 100 DVI, NEC memory cartridges, different battery packs, etc.
Rick Hanson used to be the one to go to for details.