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by ilkke 625 days ago
Agree NES is a good place to start. C64 SID is not FM at all, but agree it's not easy to learn.
1 comments

SID chip does have some FM components to it, for exemple ring modulation or LPF/HPF. This is what makes the learning curve pretty high for it.
Ring modulation is a form of amplitude modulation, not frequency modulation. Filters are not modulation at all.