What is Operating System ? History of Operating System?

August 6, 2010 1:40am CST
Computer system consist of of one or more processor,some main memory,disk,printers, display,network interface and input/output devices.Computers are equipped with layers of software called "Operating System".Modern famous operating systems are windows,Unix,apple.Process management,memory management,file management and input/output management are the important function of operating system.Unix is the mother of operating system developed in 1969 by a group of AT&T(American Telephone and Telegraph)company at Bell Labs.
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