That is how we coded. TECO, my first editor, requires keeping ones code in your head while typing in edit instructions. At 300 baud a teletype was pretty slow t

That is how we coded. TECO, my first editor, requires keeping ones code in your head while typing in edit instructions. At 300 baud a teletype was pretty slow to print back the code that you had typed, so every dozen or so line edit commands I would print out the lines I was working on. Try out ed on a Unix or Linux (or MacOS) system to get a taste of the experience, and don’t forget that playback happened on a teletype printing back at around the speed of a fast typist. Nevertheless, this was much better than punching cards.