Well, evidently the processors worked with binary instructions, but these were based on primitive Lisp operations. There's more information in http://hdl.handle

Well, evidently the processors worked with binary instructions, but these were based on primitive Lisp operations. There's more information in http://hdl.handle.net/1721.1/5731 http://hdl.handle.net/1721.1/5731 and quoting from the wikipedia http://en.wikipedia.org/wiki/Lisp_machine http://en.wikipedia.org/wiki/Lisp_machine These machines had hardware support for various primitive Lisp operations (data type testing, CDR coding) and also hardware support for incremental garbage collection. They ran large Lisp programs very efficiently.