Reservoir computing says don’t train the dynamics, just train the readout. I used the SID’s analog filter as the dynamics and one ridge regression as the readout. It’s not state of the art, but the chip earns its keep exactly where a linear model falls apart.

Building and verifying the Commodore 64 SID chip’s 23-bit LFSR in hardware on a breadboard and comparing the output against the actual SID chip.