That was gone at a time when Lisp Machines were commercialized (81/82). Emacs there was called Zmacs and was written in Lisp. Maclisp was replaced by Lisp Machine Lisp / ZetaLisp / Common Lisp. UNIX was then a thing.

Open Genera in the early 90s then ran on OSF/1 UNIX (https://en.wikipedia.org/wiki/OSF/1 , renamed to Digital UNIX) on DEC Alpha. OSF meant Open Software Foundation ( https://en.wikipedia.org/wiki/Open_Software_Foundation ), a group propagating "open standards" for UNIX.