A. Colmerauer, U Aix-Marseille, ca 1984. Marseille prolog, with unification replaced by constraint resolution. [deferred goals too?] (Not to be confused with prolog 3, a commercial product?) Version 1.2 for MS-DOS. ["Opening the prolog-III Universe", BYTE 12(9):177-182 (Aug 1987)]. ["An Introduction to prolog III", A. Colmerauer, CACM 33(7):69-90 (1990)].