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Most of the Williams 6809-based arcade games had an on-board blitter to move pixels to the bitmap display. The very earliest games, such as Defender, didn't use one, but most of the later ones did. There were 2 variants of the blitter chip, the latter just a bugfix. Many years ago I did an FPGA impl...

There are a couple of Konami arcade games with dual 6809s which - I believe - see the same memory via time-interleaving accesses. It has been a very long time since I looked at the hardware for this platform, so I'm going off memory here... but the best-known game on this hardware is Time Pilot '84....

That's pretty cool, but for an even more authentic experience you could hook your control panel up to MiSTer and run the Defender core.

Hell it might even be possible to play Defender on MiSTer's CoCo3 core as well!?!