Actually, I
see a lot more Z80-based games than 6502 or 68000. Ready
supplies and familiarity with most contemporary programmers, I would expect.
Not that there aren't surfeits of 6502 and 68K games, of course.
Sure. I think the 6502 was heavily favored by Atari (for obvious
reasons) and not many other vendors.
Not just Atari, however. Data East used the 6502 quite a bit too early on
(Disco No. 1 is an example), and the N2A03-based Nintendo games (NESes in a
cabinet) were stealth 6502s.
The 6809 (Defender, et al.) was,
I think, more popular;
Mostly with Williams, and to a lesser extent Namco. Joust, Sinistar,
Robotron ...
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