Of all the silly ways to mine bitcoin, this is my favorite. [stacksmashing] used an old Game Boy connected to a Raspberry Pi Zero. In the video, he gives a good high-level overview of how bitcoin mining works.
From Hackaday:
— Read the rest[stacksmashing] does a great job of explaining the project, covering everything from the Game Boy's link port protocol to the finer points of the Bitcoin algorithm in explicit detail.