I actually asked Dr Colmerauer once if the original program code had survived, but sadly he did not believe any of it was still around.

Interesting that Prolog grew out of an NLP project in Marseille rather than a logic-programming research agenda — SLD resolution got attached to it afterward, not the other way round.

I discovered Prolog in my youth, and logic has been something of an addiction ever since - not always, I suspect, a particularly useful one.

Lately, though, I have found what may be an antidote in Emacs, Lisp, and functional programming.

Then again, perhaps I have merely traded one elegant addiction for another.