With retropie 3.0 there is an option in the retropie menu to configure retroarch controls (I haven’t had any issues with my ROMs), one of them is to configure the keyboard. Its pretty self explanatory. By default the keyboard just works anyhow- arrow keys are the Dpad, x is a… Etc. You should also just be able to change the retroarch.cfg file manually if you want different keys to be used depending on which emulator you are using.
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