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So a quick google to verify my memory says PS/2 supported unlimited N-Key Rollover, but this absolutely does not line up with my memories of needing to press like six keys at once in a videogame and hearing beeping come out of the speaker on my motherboard indicating I was firing off too many simultaneous keypresses.
Ben Eater did a video on this using an oscilloscope!
he even covers the difference between crappy keyboards that can only handle a couple of keys and those that can do lots
i just rewatched this video like 2 weeks ago, it's really good stuff!
