Comment by pjmlp

Amiga 500 was shipped with AmigaOS 1.2 in 1987, Amiga OS 3.1 was released in 1994, almost at the end of the commercial life of Amiga.

As the sibling comment points out, MicroEmacs isn't really Emacs.

Also Emacs history is older than UNIX, and overlaps with Lisp Machines.