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Have you tried on older Retropie versions? I read of there being compatibility with piplay, which is another Raspberry Pi OS made for gaming and emulation. I’m going to work on it some more tonight but i’m close to giving up and just replacing the circuit inside the arcade stick with a compatible one…

there’s also another thread where someone mentions the NeoGeo X issues but I don’t believe the questions posed in that thread lead to a solution or fix but it’s worth a read.