In the past few years, we have covered a bunch of Raspberry Pi powered arcade machines. RealMagicman03 has built one with about 1000 LEGO pieces. It has a SNES style controller, 3.5″ HDMI display and can run many old, classic games.
More gadgets like this: here
According to the maker, this system can build Atari 2600 to PSP games. You can find out more about it on Reddit.
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