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Re:A Mystery of Unix History by Isamu on Wednesday November 20, 2019 @01:49PM (#21587075)
> why would both of these editors be developed in such a way that they are downright inconvenient to use on the hardware on which they most frequently ran?

As other comments note, they were developed on earlier models or non-Dec terminals.

Also Emacs was not developed on Unix. The first Unix Emacs was created by James Gosling of Java fame.

Re:A Mystery of Unix History by aap_ on Wednesday November 20, 2019 @03:27PM (#21588122)
Certainly not. The first emacs was created for the TECO editor on ITS by various people. It was further developed and maintained by RMS. Gosling's emacs came a few years later.
Re:A Mystery of Unix History by invsblduck on Wednesday November 20, 2019 @03:39PM (#21588237)
Then there's this debacle I've never spent enough time getting to the bottom of... https://www.reddit.com/r/programming/comments/dhrcxw/james_g...
Re:A Mystery of Unix History by bbanyc on Wednesday November 20, 2019 @07:16PM (#21590110)
https://github.com/larsbrinkhoff/emacs-history has the details... there's some Gosling code (notably display.c with the skull-and-bones warning) in Emacs 13, but none that I can find in 15 and later.