Thanks! I run a retro gaming website and YT channel that have nothing to do with onions, but lots of people see and comment about that as my common username 
- Fair enough re: md vs bin files, I mostly posted that for awareness since .bin are more common; some people may have to replace the files in their libraries. Not a big deal since Genesis files are relatively small.
- I was using GPSP to start, I did get it working with mGBA. GPSP is fickle with BIOS files across the board with RetroArch/libretro, I’m sure it has funky BIOS requirements embedded in the core.
Cheers
