Origin Of Emacs

From David McKenzie’s blog
<https://blog.djmnet.org/2008/08/05/origin-of-emacs/>:

    EMACS was written in TECO, but not the TECO that most people know.
    Most people know a very stripped-down and bastardized TECO which
    Bob Clements adapted for the DEC operating system for the PDP-6.

    ...

    The original TECO used a display scope to display the text being
    edited around the editing point. It remained a source of wonder
    and astonishment to the original authors of TECO that anyone ever
    used it without a display screen.

    ...

    This guaranteed EMACS a place in the sun. Without McMahon and
    Stallman's efforts we'd probably all be using vi or worse today.