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by encode 3119 days ago
To clarify: this is not Emacs. Instead, it is a text editor that features improvements over the built-in editor. It was partly written by Carsten Dominik (creator of Org mode), who is an Emacs user. Some features were inspired by Emacs, but the similarities end there.
2 comments

Insofar as this is true, the original EMACS was not Emacs, either. Instead, it was a collection of Editor MACroS for TECO.
I’ve read the TECO was a nightmare to use.
TECO got easier to use with time, especially after the MIT people added ^R (Realtime) mode, which showed a whole screenful of text at a time as opposed to the earlier behavior where TECO would print on command but was otherwise like ed instead of vi. Makes sense, seeing as how TECO originally stood for Tape Editor and COrrector, as in paper tape.

TECO's main claim to fame was its command language, which became its programming language: People wrote programs (including the original EMACS) in TECO's command language, where most commands were non-printable characters in ASCII. There were conventions to print those characters readably (well, readable for human TECO users), such as printing Esc as $, but the fact remained you were programming with line noise. ;)

There's a TECO for modern systems, called Video TECO, here:

https://sourceforge.net/projects/videoteco/

Manual:

http://www.copters.com/teco.html

Wiki on TECO, with lots more links:

http://wiki.c2.com/?TecoEditor

Maybe, but "you can hack anything that you want with just TECO and DDT." http://redmartian.com/napster/Red_Martian_-_Deny_Authority_2...
Probably what you mean is that it's not "GNU Emacs"