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This has been added to the NES wiki: https://github.com/RetroPie/RetroPie-Setup/wiki/Nintendo-Entertainment-System#how-to-setup-turbo-buttons-for-lr-fceumm
@Charononus Might be useful thanks. And the es_input.cfg would be useful for comparison.
Like a guess that you aren't using a libretto core PSX emulator.
@pawpie try to follow these steps I'm talking here:
https://retropie.org.uk/forum/topic/2719/keyboard-stopped-working-after-i-played-around-in-the-controller-config-in-rtgui/2
