[WallWextra]

The most pleasant thing about this is how the lisp machine's instruction set turned out to be a good bytecode for interpretation. Calling it "microcode" seems risible today, but I don't know if it was as ridiculous in 1993.

[pjmlp]

Not at all, it was pretty common even during the 60 and 70's, e.g. Burroughs and Xerox PARC systems.

[rjsw]

The "microcode" is the bytecode interpreter on the physical machines.