What are the really unusual or weird computers?

[woodelf]

Liam Proven wrote:

> But I keep reading about Lisp machines. No good general-purpose
> introduction for the interested computer-literate reader who's never
> seen one and doesn't speak Lisp, though, but from what I've read, they
> sound unique.
Somebody as research project built a lisp cpu on  chip. It can't add but
but can run a simple lisp quite well. I read about this years ago
so I can't say more.