I was just wondering what is the best emulator, where can I find the games(there used to be something mame.mk, is that still around) and how big are the game files?

Lastly how does it run on the 3650?

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Mame is OK but you should try PicoDrive - Sega MegaDrive/Genesis emulator.

I've got that, and I want Mame aswell. Okay then, I just want to know what is the best emulator then.

There is only one MAME emulator for Series 60 so there is no competition.

I would suggest Goboy. It is a gameboy emulator. It emulates gameboy and color gameboy from what I've seen.