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At least some VAX models supported user-supplied microcode and thus a customizable ISA. This could be used, for example, to implement a Prolog abstract machine
by twoodfin 5y ago
At least some VAX models supported user-supplied microcode and thus a customizable ISA. This could be used, for example, to implement a Prolog abstract machine directly on the CPU[1].
[1] http://hps.ece.utexas.edu/pub/gee_micro19.pdf http://hps.ece.utexas.edu/pub/gee_micro19.pdf