MULTICS
-The project of MULTICS started in 1964, led by MIT, along with General Electric and Bell Labs.
-It is an influential early time-sharing OS built on GE 645 computer, and a multi-user and multi-task OS based on the concept of a single-level memory.
-Innovations: PL/I, time-sharing scheduling, virtual memory, segemented memory, shared memory multiprocessor
-Although it failed, it had significant influence on modern OSes, especially on Unix.