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Re: Prolog implementation, in case you haven't already found it, the book Warren's Abstract Machine: A Tutorial Reconstruction, by Hassan Aït-Kaci, is pure gold for understanding the WAM.

http://web.archive.org/web/20030213072337/http://www.vanx.or...

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Yes - I have a printed copy of that, actually. It's not the end of Prolog evolution, but it's a good snapshot of common implementation techniques, and it definitely clarified things.

Here's a (rather snarky) LtU comment by Peter Van Roy pointing to other designs improving on the WAM - http://lambda-the-ultimate.org/classic/message1618.html#1108...

Easier link http://wambook.sf.net/

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