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    Koopman is great if you want to understand stack architectures (tho as I recall he doesn’t really dig deep on multi-stack, esp 3 and 4 stack possibilities, this far back). But this is from ‘89, and there’s probably a reason that stack machines aren’t the dominant architecture, no matter how much hyperbole he heaps on them. I’ve got a soft spot, first because the Burroughs Large Systems mainframes are really cool and second because it’s pretty easy to look like a rock star in undergrad computer architecture implementing a simple stack machine and a crappy Forth.