https://www.vice.com/en_us/article/v7m95j/youtubers-game-boy-mining-rig-will-mine-one-bitcoin-in-several-quadrillion-years

Released in 1989, the original Nintendo Game Boy introduced a generation to the joys of Tetris. With a few extra pieces of hardware, it could take photographs, print pictures, or count your steps. More than 30 years later, people are still finding uses for the machine. The Game Boy can even mine bitcoin. Just not quickly.

As first spotted by PCGamer, YouTuber stacksmashing repurposed an old Game Boy using a Raspberry Pi Pico, an old link cable, and some basic software. The Pico board controls basic input/output from the Game Boy to a PC. It all runs through a link cable modified with a USB and uses a logic shifter to modulate the voltage between the Game Boy and Pico.