Ok, the best emulator for mame imo for the pi at the moment is the mame4all binary version and not the retroarch core version. Petrockblog just added it to the script so first download that from source. Then the only roms compatible with it are the mame 0.37b5 rom sets. You can search for this on a well known swedish site. That should work!
Sent from my GT-I9300
