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by ernesth 1871 days ago
> membrane keyboards generally have 2KRO,3KRO, or 6KRO while mechanical keyboards support N-key rollover (no matter how many keys you are holding down simultaneously, all of them will be registered correctly).

2KRO means 2-key rollover. If you push 3 keys simultaneously, one will not be taken into account.

It is in fact a little more complicated than that (2KRO guarantees that any combination of 2 keys will register both, but some 3 or more key combinations will also work).