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I'm having some problems on Null DC I'm using my Dualshock 4 controller I'm configuring my controller but when I go to the menu the x circle square and triangle buttons don't respond and the analogs don't work either but when I push up on the analog it acts as the A button when I push the left stick left (and I didn't even touch the left stick during configuration) and it acts as the b button and the select button doesn't work either.
I'm referring to the Dreamcast menu BTW
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Double check the settings for the pad and re set it up if needs be
You can also try something like joy2keys that may give you more joy (you may even be able to do that with the drivers you have already for the PS4 pad)
Never had issues with a pad with it but never used a DS4 pad with it either just a PSX/PS2 pad via a USB converter
My PS3 and 4 pads get used by there consoles and a PSTV so never bothered to try those out on my PC