"Lisp machine" means a CPU or a computer specialized for running Lisp (which stopped being made in the 1980s or 1990s). You mean "a Lisp implementation" or "a L

"Lisp machine" means a CPU or a computer specialized for running Lisp (which stopped being made in the 1980s or 1990s). You mean "a Lisp implementation" or "a Lisp language processor".