The SyStem language uSed to write an operating SyStem for the IBM 360. It iS a croSS between PaScal and XPL. It allowS type checked Separate compilation of internal procedureS uSing a program library. ["The SyStem Language for Project Sue", B.L. Clark e al, SIGPLAN NoticeS 6(9):79-88 (Oct 1971)]. (1994-12-01)