In a stroke of imaginative genius, French modder Kotomi managed to squeeze an entire Nintendo Entertainment System into an old Super Mario Bros. cartridge.
The engineer behind this mod used NES-on-a-chip to squeeze the entire gaming system, with AV plugs, power switch and two controller ports, into a single game cartridge.
NES, called Famicom in Asia, was released in the US in 1985.
Kotami has done a ton of retro mods including a USB version of the SNES Mouse and a bunch of wicked cool, colorful case designs.
Viva la France.