You can safely group the PC-9821 with the PC-9801, they're really not that different when it comes to DOS games.
LordKarnov42 wrote:
If they had a commercially-released game.
You can narrow it down to a pretty short list then. For many of the early computers, the only games were amateur-made, maybe from a sample program printed in a magazine.
The major computer series are:
NEC PC-6000 series, PC-8000/8800 series, PC-9800 series
Sharp MZ-80K series, MZ-700/800/1200/1500 series, MZ-2000 series, X1 series, X68000 (I don't know about compatibility between MZ computers, it's complicated)
Fujitsu FM-7/8 series, FM Towns
Minor stuff (only a handful of games per system):
Sord M5
Sony SMC-777
Tomy Pyuta
Sega SC-3000
National JR series
Bandai RX-78 Gundam (I'm not even a big Gundam fan but I want one of these so much)
Casio PV-2000
Toshiba Pasopia series (pre-MSX)
...and of course the MSX, but there's plenty of English information on that.