CDC Kronos

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DeveloperControl Data Corporation
Working stateHistoric
Initial release1970s
Latest releaseKronos level 439
Marketing targetMainframe computers
PlatformsCDC 6000 series and successors

Kronos is an operating system with time-sharing capabilities, written by Control Data Corporation in the 1970s. Kronos ran on the 60-bit CDC 6000 series mainframe computers and their successors. CDC replaced Kronos with the NOS operating system in the late 1970s, which were succeeded by the NOS/VE operating system in the mid-1980s.[1]

The MACE operating system and APEX were forerunners to KRONOS. It was written by Control Data systems programmer Greg Mansfield, Dave Cahlander, Bob Tate and three others.

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