ZetaLisp language
The Maclisp dialect used on the LISP Machine. The many extensions to Maclisp include vectors, closures, flavors, stack groups, locatives, and invisible pointers. Currently supported by Lisp Machines, Inc. and Symbolics.
["LISP Machine Manual", D. Weinreb and D. Moon, MIT AI Lab, 1981].
(1997-03-18)