I am facing a problem setup MAME4ALL-PI.
Helped by Trimmtrabb and the community in general, I found like you all after several days of tests that MAME4ALL-PI emulator was better than those included by default in Retropie.
Although the list of Roms is more limited, but games work perfectly .
But unlike other emulators, I can not find the config file which allows me to run my controller on the RPI . ( Paddle with PCB Zero- delay)
I find that when I start a game, if I press TAB, I can configure my controller in the interface options MAME4ALL-PI, but once out of the game, my settings are not saved.
Anyone know where it is the config file that would finally determine the configuration of my controller ?