Well, I finally got most of my MAME Roms working on Retroarch, except for Marvel vs Capcom 2. I’m just wondering how you can get it running. Is there a parent rom, a special bios, a sound rom I need? Also, where exactly do you put bios files?
MvC2 does not currently run on MAME to my knowledge. It requires the naomi bios, which, if you try to boot, you will notice it is extremely slow, maybe 5fps. The Dreamcast and PS2 versions should work with reicast and pcsx2 respectively though.