Hello,
I got the MAME emulator to work flawlessly on a couple ROMs. The ones I have working are Contra, Simpsons, Space Invader 2, Zero Wing and Tetris. There were a few ROMs that I tried loading that said they weren’t supported, I later learned that’s because iMame4All didn’t support them, so I found this list: https://code.google.com/p/imame4all/wiki/GameList.
So, I got the ROMs KoF ’98, Metal Slug 001, Pac-Man, and Street Fighter 2, among many others, and instead of giving me an error when I tried loading them, they would simply load up RetroArch and not the ROM at all. I tried Googling this and have gone through pages of Google results looking for something similar happening, but can’t find anyone with the same issue. The ROMs I’m using are all cross checked with the game list I linked above, so they should work, right? Street Fighter 2 is a rom that was working on my brother’s cabinet (He doesn’t use the Pi though) so I know it’s at least a working ROM.
Not sure what kind of information I need to give you aside from that, so let me know.
Thanks.