I love this little mini-episode of How It’s Made. It takes an almost antediluvian bit of tech — rolls for automated player pianos — and then shows how two Apple computers almost as ancient help make them.
This is just retro Mac porn. It gets a little titillating when you see the pianist recording a player piano score on an old PowerPC Mac, but wait until you see how the player piano tune is converted from MIDI into a player piano roll via loading the score on a floppy disk onto an ancient Apple II hooked up to a massive punching machine. Then it’s just as good as it gets.