W. F. Clocksin. What is Prolog-X? Computer Laboratory [University of Cambridge]. Undated, but after August 1983.
W. F. Clocksin. What is Prolog-X? Computer Laboratory [University of Cambridge]. Undated, but after August 1983. Andy Cheese’s Bibliography on Functional and Logic Programming tags it CLOCK84d. "Prolog-X is a portable design for a high-performance Prolog system intended for large-scale applications. … With the impending demise of the DEC-10, together with the wish to run big programs on machines such as the VAX and 68000, I set out to design a system based on Lawrence Byrd’s ZIP abstract instruction set … . Starting around March 1982 I implemented as much as I could, time permitting, in Pascal on a VAX under VMS. … The last release was Release 1.6 (August 1983)."
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