Quizard 1, 2, 3 and 4 now fully working, although you have to wait about 25 seconds after starting up the machine before clicking 'Play' (the external MCU is supposed to force that input, but it's not wired up):
Additionally, Mega Maze no longer hangs when going in-game, and Santa Claus's Mice no longer issues a "disc dirty" error when pausing mid-story. Probably more things fixed associated with the CDIC, but I don't know about them.
Next stop is to figure out what's up with the MCD212 chipset.
