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My friend had a Scooter that could be tuned with a Gameboy (In Norway bikes are capped at 45 km/h for 16 year olds.)

Could you tell us more ? https://www.google.com/search?client=firefox-b-d&q=norway+tu... first result is your very comment at the moment :).

It looks like Aprilia scooters ECU reprogramming through a Gameboy:

One version of diagnostic system for Ford cars used the same LCD panel as the Gameboy.