> Cycle accurate with all those high clock speed cpu's interacting is basically > impossible. > Writing an emulator that is accurate enough that the games are happy is more likely.
The original gate-by-gate design files for the N64 customs are out in the wild, so it's actually theoretically possible. It's a bit easier than going from a completed chip would be, something that's been successful for 6502 and is in progress for Z80, 68000, and the PSX CPU.
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