put your ROMs in /home/pi/RetroPie/roms/mame
put your samples in /home/pi/RetroPie/roms/mame-samples
that’s it.
If your games don’t run (‘missing files’ errors) it is because you don’t have MAME 0.37b5 ROMs.
https://github.com/retropie/RetroPie-Setup/wiki/Managing-ROMs
