I have a copy of the sources for Dave Conroy’s microemacs, if there’s any interest.
It is certainly the smallest one I know about.
I suppose it was quite late to the emacs party, dating from 1989 or so. The sources
include support for Ultrix and various mini and micro systems, plus a few terminal types.
I used to use to use it on small and partially installed systems for editing config files.
This role seems to be taken by nano in the modern day.
I asked him once how to change the key bindings and Dave said “You use the Change
Configuration command.” “On Unix it is abbreviated as cc.”
-L