You would make lots of people happy if you did a new Space Invaders
board. It's a trivial design (the biggest part would be the discrete
sound stuff) by todays standards. You could get rid of everything
but 5V for power, and if you could easily build a multi-game with
a dozen or so variants. All the I/O port definitions can be found
in the MAME sources.
I guess you could do a 'generic' AVG board for all the games other
than Asteroids(dlx) and Lunar Lander, and a DVG board for those
(and Omega Race). There are enough differences in the design to
make it tricky to do, though. Again, you can see all the memory
maps and things in the MAME sources.
