This article presents a timeline of events in the history of computer operating systems from 1951 to the current day. For a narrative explaining the overall developments, see the History of operating systems. 1950s 1951 LEO I 'Lyons Electronic Office' was the commercial development of EDSAC computing platform, supported by British firm J. Lyons and Co. 1955 MIT's Tape Director operating system made for UNIVAC 1103 1955 General Motors Operating System made for IBM 701 1956 GM-NAA I/O for IBM 704, based on General Motors Operating System 1957 Atlas Supervisor (Manchester University) (Atlas computer project start) BESYS (Bell Labs), for IBM 704, later IBM 7090 and IBM 7094 1958 University of Michigan Executive System (UMES), for IBM 704, 709, and 7090 1959 SHARE Operating System (SOS), based on GM-NAA I/O 1960s 1960 IBSYS (IBM for its 7090 and 7094) 1961 CTSS demonstration (MIT's Compatible Time-Sharing System for the IBM 7094) MCP (Burroughs Master Control Program) 1962 Atlas Supervisor (Manchester University) (Atlas computer commissioned) BBN Time-Sharing System GCOS (GE's General Comprehensive Operating System, originally GECOS, General Electric Comprehensive Operating Supervisor) 1963 AN/FSQ-32, another early time-sharing system begun CTSS becomes operational (MIT's Compatible Time-Sharing System for the IBM 7094) JOSS, an interactive time-shared system that did not distinguish between operating system and language Titan Supervisor, early time-sharing system begun 1964 KDF9 Timesharing Director (English Electric) – an early, fully hardware secured, fully pre-emptive process switching, multi-programming operating system for KDF9 (originally announced in 1960) Berkeley Timesharing System (for Scientific Data Systems' SDS 940) Dartmouth Time Sharing System (Dartmouth College's DTSS for GE computers) OS/360 (IBM's primary OS for its S/360 series) (announced) SCOPE (CDC 3000 series) PDP-6 Monitor (DEC) descendant renamed TOPS-10 in 1970 EXEC 8 (UNIVAC) 1965 THE multiprogramming system (Technische Hogeschool Eindhoven) development Multics (MIT, GE, Bell Labs for the GE-645) (announced) BOS/360 (IBM's Basic Operating System) TOS/360 (IBM's Tape Operating System) TSOS (later VMOS) (RCA) Pick operating system 1966 OS/360 (IBM's primary OS for its S/360 series) PCP and MFT (shipped) DOS/360 (IBM's Disk Operating System) MS/8 (Richard F. Lary's DEC PDP-8 system) GEORGE 1 & 2 for ICT 1900 series Remote Users of Shared Hardware (RUSH), a time-sharing system developed by Allen-Babcock for the 360/50 SODA for Elwro's Odra 1204 1967 CP-40, predecessor to CP-67 on modified IBM System/360 Model 40 CP-67 (IBM, also known as CP/CMS) Conversational Programming System (CPS), an IBM time-sharing system under OS/360 Michigan