So... I was trying to emulate a keyboard with an Arduino Mega... When I tested it out, it turns out that that the keys were messed up and I kinda screwed up the key config on the Mame4All emulator and can't acces the menu. I did fix the key config from the frontend menu, but I can't configure the keys individually for each rom. For the most part, it works fine, but there are some game I wish to customize. Where can I find the config file?