The Glorious Horror of TECO (2010)
Though the author is confused about Emacs history, talking about Stallman&#x27;s and Gosling&#x27;s Emacs as if they were the same thing.<p>IIRC (I was around the AI Lab a bit after the fact) Richard Gabriel and Guy Steele (MIT AI Lab) wrote the original Emacs (editor macros) in TECO under MIT&#x27;s ITS, which was a huge superset of the original DEC TECO. RMS took it over after a while, since RPG and GLS were mostly doing academic stuff. (Mike McMahon (MMcM) and others ported the ITS version to TOPS-20.)<p>Meanwhile, Bernie Greenberg wrote an Emacs in Multics Lisp, which was a huge influence on future Emacs implementations.<p>Eventually, RMS and others wrote the current Emacs.<p>Gosling&#x27;s Emacs (nicknamed Gosmacs, written while he was at CMU, I believe) was a C-based implementation for Unix, and a poor-man&#x27;s subset of the real thing.