I found an old 11/40 that had a memory issue to work on, and started learning machine code, etc. Somewhere along the line, I was infected with a love of TECO, a relic of an editor that was said to be the basis for EMACS.
I wrote my own version out of nostalgia in 1991. I put it on Github a few years ago.[1]
It's only in the past few months that I learned that the first versions of TECO were actually full screen editors, which floored me, as I had always assumed TECO stood for Tape Editor, Character Oriented.... and started with teletype terminals and paper tape.