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Someone discovered the reason why controllers use "A, B, X, Y" buttons, and it was answered 32 years ago

A/B marked primary buttons, X/Y marked secondary buttons. A 1993 Nintendo Power Q&A confirmed the CAD origin of the ABXY ...

5 ways to fix an Xbox One controller that is blinking or flashing

If your Xbox One controller is blinking, it could indicate that it's not paired to your console, which is usually a quick and easy fix.