I have one of these. Rather my wife does. It is not in use anymore as it jams frequently, but we haven’t gotten rid of it quite yet.

This is incredible. Long lost forgotten tech not only surviving, but being understood and reverse engineered to then be emulated, just mind blowing.

Peugeot and Aprilia scooters used a gameboy with a special connector cartridge to scan for fuel injection issues and tune the ECU.

https://www.motor1.com/news/701772/game-boy-diagnostic-cartridge-peugeot-aprilia-suzuki/

Had to buy one of eBay to remove the speed limiter from one for a friend a few years ago.