First off, I am not sure if this question fits here, so sorry for any inconvenience, mods!
I've looked over the internet, and I found this pretty little thing called nanoloop, and I've been wondering if I can make something like that myself. As I am pretty familiar with Arduino, I thought that I could make an Arduino somewhat of a Gameboy cartridge, and probably someone on the internet has done it, right?
Wrong. I haven't found a thing in people trying to use Arduinos as Gameboy cartridge processor. So, here comes my question: Is such thing possible? If so, where would one start?