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There used to be a circuit simulator for most discrete logic arcade games of the 70s: DICE.

http://adamulation.blogspot.com

Unfortunately it hasn't been maintained for a while, which is a shame because I don't think any other program does this. MAME/MESS only simulates machines with CPUs.

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One can definitely play Pong on MAME:

https://github.com/mamedev/mame/blob/master/src/mame/machine...

And that code corresponds to the contents of the submitted article.

MAME also simulated hardware (connect this resistor to that transistor etc). This is all hardware and no CPU.

The MiSTer FPGA system is probably what you’re after, in the modern scene. See https://youtu.be/lVPa5EW5mp8 for an example of it being used with arcade hardware via an adapter.

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