Matt over at Liquidware Antipasto is making an Open Source GameBoy out of an Arduino:
Ok, so ever since middle school I’ve wanted to make one of these… but I only now have enough know-how and support to make it, … an Open Source game boy
Actually, it’s a little smaller than a game boy, but it’s 1000% cooler (in my opinion) because it uses an Arduino as the “core”, and a few modules and shields that already exist.
But does it Tetris?
Using the InputShield to make an open source Gameboy [Liquidware Antipasto]
