Sim2600

Still has lots of edge cases, but the documentation and reverse engineering work is far ahead of the Game Boy. ...to the point where there are transistor-level simulations of the CPU and PPU: http://www.visual6502.org/JSSim/ https://wiki.nesdev.com/w/index.php/Visual_2C02 The only other game console I'm aware of a public transistor-level simulation for is the much more limited Atari 2600: https://github.com/gregjames/Sim2600

https://github.com/gregjames/Sim2600/blob/master/nmosFet.py , https://github.com/gregjames/Sim2600/blob/master/circuitSimu... It looks like they're only working with logic levels, rather than "actual" device simulation. It's reasonably common in the digital IC crowd to call this "transistor-level", but indeed, it's not what most EEs usually call a transistor-level simulation (where one would actually expect the behaviour to be modelled down to the behaviour of a transistor). If we insist on jargon, this is actually a switch-level simulation.