To answer your other comment: yes, the MCP from Tron was named after the Burroughs/Unisys OS. Bonnie MacBird, the screenwriter for Tron, is the wife of Alan Kay

To answer your other comment: yes, the MCP from Tron was named after the Burroughs/Unisys OS. Bonnie MacBird, the screenwriter for Tron, is the wife of Alan Kay, who served as technical consultant, and she dropped references both to himself (Alan Bradley) and his areas of interest (Kay loved the Burroughs architecture and in particular its tagged-memory features) in the script for the movie. Interesting to learn the real MCP was nearly as hostile as its fictional namesake.