GB, GBC are not going to work. To be honest, I don't know about emulators and I really don't care. I have the old EZ Flash IV as well, and it ran emulators as GBA roms. So what you had to do was take say SNES roms and with a windows app you would add the roms physically to the emu rom. So that thing would grow and grow. The EZF would run the rom, and within it were your SNES roms. I found this to be a complete waste of time, so I basically gave up on all emulators. It's possible the Goomba Game Boy emulator could work in the same way, but like I said, the procedure to build the emu rom was nasty. No Thanks. In any case I would figure 32GB is more than enough.