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RPN is forth not lisp, and I seriously doubt HP got their idea from emacs. I think HP's RPN precedes the first release of emacs anyway. Edit: 1st release of emacs was 1976 so I take that last bit back.

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Sorry, I mistyped. I was thinking about HP42 and above RPL not the basic RPN. RPL is a blend of lisp idiom on top of good old stack based RPN (list, map, numerical tower). It goes so far that they even added quoted lambda expressions. You could push << a -> + a a >> on your stack.

RPL is like LISP in that it's all about quoting. ' and eval are primary (unshifted) keys on these calculators.

There was a LISP based pocket computer: the Casio AI-1000:

https://www.youtube.com/watch?v=H-yuZ2pejGU

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