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INSIDE those OLD pinball machines
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this post was submitted on 08 Dec 2023
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Maybe you're thinking of EPROMs? I can't think of anything else that you'd need UV light for. Even then the UV was used to erase them, not write.
Modern FPGAs don't use UV light, but maybe earlier ones did? As you say, EEPROMs used UV for erasing before writing again.
...now i'm getting confused. Those chips with the round window in the center, what were they again?