Alright, regarding my keyboard inputs not working with MAME, and I think I'm getting close to the issue- I made some changes in my nVidia control panel based on recommended settings for MAME (G-Sync user), which used to work perfectly fine before, but now, after these changes, the keyboard inputs won't respond when a game is loaded, but the joypad works perfectly fine. I don't know if it's an nVidia issue or a MAME issue....
Also DS4 - DualShock 4
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