@brejoc Search for Mezzano. You may also read about McCLIM. Other than that there is CLOSOS. Top that with Medley Lisp revival and Genera open-sourcing efforts by Gary Palter and you'll have a pretty lively picture of the lisp machine -inspired experience. None of these though attempts to create a specialized hardware as far as I'm aware.
@brejoc Although there was a talk <vaguely points at IRC> about building RISC-V cores tailored for Lisp systems. I don't remember details nor the people involved.
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