I'm a quite recent user of the Raspberry Pi and I'd like to turn it into a retro arcade machine just like I've seen on internet. I've downloaded MAME4ALL from the PiStore as well as a package of roms. I've already used an old version of M.A.M.E. on Windows and had not any problem. It was all simple just needed to change to directory of the rom file. Whereas for the Raspberry Pi, I really don't know where to put the roms. I just want to set the directory of roms to a USB stick just like I've done with Windows. How can I do that?
MAME has a configuration file that you need to edit (