TheMultiple Console Time Sharing System (MCTS) was anoperating system developed byGeneral Motors Research Laboratories in the 1970s for theControl Data CorporationSTAR-100 supercomputer. MCTS was built to support GM'scomputer-aided design (CAD) applications.^[1]

MCTS was designed starting in 1968. It was written in a high-levelsystems programming language "Malus", a dialect ofPL/I. A superset of Malus calledApple became the primary application language.^[2]

MCTS was based onMultics.^[3] All access to data was through thevirtual memory system. Only the system paging support module was concerned about the physical location of the data.^[2]

• GM-NAA I/O
• SHARE Operating System
• Timeline of operating systems

• Krull, F.N. (Fall 1994)."The origin of computer graphics within General Motors"(PDF).IEEE Annals of the History of Computing.16 (3).IEEE:40–56.doi:10.1109/MAHC.1994.298419.

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