> I only mention it as I don't think many in the CS field get exposed to it. Because it is a specialized commercial offering. > Oh I agree that a Lisp machine

> I only mention it as I don't think many in the CS field get exposed to it. Because it is a specialized commercial offering. > Oh I agree that a Lisp machine or Smalltalk machine is turtles all the way down. Many non-Lisp-Machine Lisps are also mostly written in itself. Implementations like SBCL provide a wide spectrum of performance.