Comment by bsimpson
YT recently recommended his explanation of how pre-computer pinball machines worked to me - a series of 3, hour-long videos. Gave me something to look forward to on my commute. I shared it with everyone I know, and now I'm sharing it with you:
https://www.youtube.com/watch?v=ue-1JoJQaEg
Fascinating (and insanely impressive) to see how a bunch of switches and stepper motors implement complex logic.
Not from the same Youtuber but that video reminded me of another great one about how mechanical bowling alley machines work: https://youtu.be/Iod6uwUGM2E