Whoops, replied off list too accidentally, sorry Jörg.

On 26/02/17, Joerg Schilling wrote:
> But the GNU EMACS is not a RMS invention...
> 
> GNU EMACS is based on the Gosling EMACS and this did already include the LISP 
> interpreter.
> 
> When Gosling started to work for Sun, he did no longer have the time to 
> maintain it and did hand it over to Unipress. RMS did take this code, added a 
> few small changed and sold it under the name GNU emacs.

As far as I know the original LISP implementation in Gosling EMACS had
to be completely rewritten. I just don't remember where I've read this.

aap