Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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. The MACE operating system and APEX were forerunners to KRONOS. It was written by Control Data systems programmer Greg Mansfield, Dave Cahlander, Tate and 3 others.

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