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GNU Emacs is a Lisp implementation with an abstraction layer over the hardware and OS. I would like to reserve "Lisp Machine" to computers with an actual Lisp operating system or emulations of those.

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Of course. I understand that calling Emacs "a Lisp Machine" is quite a stretch, but due to the lack of any actual prominent hardware-based Lisp machines these days, I think it is a permissible simplification for the orange-site discussions. Yet it is, indeed, an important clarification, I appreciate it.

There are two open source emulators of actual Lisp Machines I would recommend:

Interlisp-D/Medley: https://interlisp.org

MIT CADR: https://tumbleweed.nu/lm-3/

These run an actual Lisp operating system.

These are interesting from historical educational point of interest, but they rather don't have practical use for modern software development, do they?

It's to keep the dream alive.

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