PLASMA

PLAnner-like System Modeled on Actors

Carl Hewitt, 1975

The first actor language. It was originally called PLANNER-73, and implemented in MACLISP. It has Lisp-like syntax, but with several different kinds of parentheses and brackets.

"A PLASMA Primer", B. Smith et al, AI Lab Working Paper 92, MIT, Oct 1975.

"Viewing Control Structures as Patterns of Passing Messages", C. Hewitt, AI Lab Memo 410, MIT 1976.