There's loads of MSX/MSX2 stuff here in Japan.. you're right about that. Not sure what the systems run, but the games vary.

I was lucky enough to dig up an FM Towns Marty recently (before anyone asks --- no, I can't get anymore). The games are even harder to find. I have been able to get some goodies, although the only one I've tried out is Alshark, which is disappointing. I'm still trying to locate a Turbo Duo version to compare them. Tatsujin-Ou looks fantastic though!

X68000 is another popular machine with lots of software, but you still don't see as much of it as the 32-bit stuff (namely PSX).