Disappointed the article went straight from punch cards to video terminals without mentioning teletypes.

> Having that thing show up on computers in those days was pretty tricky, and some considered it a resource hog.

Well in the 60's and 70's, you didn't necessarily even have a display, you might be using a physical teletype. `ed` is built for that.

Even when you had a display, it could be slow. The VT05 from 1970, only went up to 2400 baud. And if you were using a modem back then I think you were definitely most likely connected at 300 baud or below.