Multics Emacs: The History, Design and Implementation https://www.multicians.org/mepap.html (the first Emacs project with a lisp interpreter!)
miniblog.
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I am fascinated to learn that Multics (the Unix predecessor) was a big influence on the lisp condition system (i.e. resumable exceptions)!
From
Mother of All Multics Emacs papers https://www.multicians.org/mepap.html (long, discusses the first Emacsen with the discovery of features used today!)