IBM Selectric 打字机与它的数模转换器

Bill Hammack of engineerguy uses slow motion video to show how the IBM Selectric typewriter works. He focuses on its fully mechanical digital-to-analog converter, which turns key presses into rotation of the type ball.

Why HN likes it: HN commenters recommend it whenever the Selectric comes up, as a short, excellent explanation of its internals.

“I highly recommend watching”