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I ported OPS5 to both Xerox 1108 Lisp Machines and the Macintosh in 1984. I did this for internal use but my company also sold theses ports.

OPS5 was very hackable. For one project I modified the Rete algorithm to support multiple data worlds. Fun times!

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Heh. I also ported Forgy's VPS5 to David Betz's XLISP around that same time, posting it to BiX (anyone remember BiX?). Ran a handful of guess-the-animal toys on it then turned my attention elsewhere.

As you say: fun times!

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