Fun blast from the past. The original version of this shipped with Mark of the Unicorn's Mince/Scribble package for CP/M. (Mince = Mince Is Not Complete Emacs)
The sources for the original version of Mince were lost long ago. It's too bad; they were very clear (thanks to the skills of Jason Linhart, the primary author, as well as Craig) and would have made a great example for study.
Thanks, it was a really nice editor.