> I will note here that the Tristar 8000 hardware employs one of the lamest protections
> against ROM swaps ever devised. Basically each game's program code starts by reading
> the coin port and then locking up the CPU if bits 7 and 6 fail to match a constant
> value. This presumably is implemented by bridging the two corresponding input buffer
> pins to GND or Vcc; if so, it can be defeated with trivial wire mods.
I notice the driver was marked as imperfect colours? IIRC the colours on this are PROM based, are we sure it isn't just a bad PROM?
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