NEC PC-8201 and PC-8300. These were all built by
Kyocera. Olivetti
also sold at least one machine built on that design, but I don't know
the model number(s).
TRS-80 Model 100 / PC-8201 / M-10 are all the same machine underneath.
Rarest of that series is Kyocera's Kyotronic KC-85.
These are all larger than a Z88, though. I think the
"no larger than
a Z88" requirement will make this pretty much impossible. The Z88 is
pretty tiny.
Right.