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by mark_ablov 960 days ago
You can run 4004 by very low frequency (much lower than specified 500kHz) and it would work OK.

I also had an idea to overclock i4040 more, but even 740kHz was hard to work with, because I had just 200 stm32 ticks per i4040 sub-cycle to do all I/O logic (RAM/ROM interface for i4040).