I don’t think this was the original source of the chip (it came from a friend) but I did have a problem with an AY-3-8910 with the Microchip branding just like the one in the picture. The problem was one of the parallel I/O port outputs was non-functional. Purely guesswork on my part but I don’t think this was so much a “fake” chip as one that failed QA testing but was somehow not disposed of properly. It’s increasingly a hazard we face in the world of “through hole” legacy chips…
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