I checked a few photos of other SRAM adapters for the C64, and they all share the same basic circuit, latching the address lines on /RAS and enabling the SRAM when both /RAS and /CAS are low, so, I guess the problem with the one I found on github are timings. Either the SRAM is too fast or the glue logic is.
So I designed an experimental board for my C64, supporting both DIP ICs and a few SMD variants that I already have in stock. We'll see if I find a glitchless combination!
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