The Free On-line Dictionary of Computing (30 December 2018):

Portable Standard Lisp

    (PSL) A dialect of Lisp from Utah University.
   PSL is available as a kit for 68000 and also runs on VAX.
   It compiles Lisp to C-code virtual machine language.

   ["The Portable Standard LISP Users Manual", TR-10, CS Dept, U
   Utah, Jan 1982].

   ["A Portable Lisp System", M.L. Griss et al, Proc 1982 ACM
   Symp on Lisp and Functional Prog, Aug 1982].

   (2000-09-25)