I've linked this before, but this video of hooking a 1930s teletype up to a Linux computer is what made ed click for me.
https://www.youtube.com/watch?v=2XLZ4Z8LpEE
It's one of the best things on the Internet, IMO.
https://www.youtube.com/watch?v=2XLZ4Z8LpEE
It's one of the best things on the Internet, IMO.
It starts with using the front panel switches to load a program into an Altair 8800 and progresses into loading programs from external sources including audio cassette and paper tape; loading programs from a ROM; loading and using an OS; and using a paper terminal for output.