What are the activities done by operating system in order to manage device ?
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Hiding the complexities of hardware from the user.
Managing between the hardware's resources which include the processors, memory, data storage and I/O devices.
Handling "interrupts" generated by the I/O controllers.
Sharing of I/O between many programs using the CPU.
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process management,
memory management,
file management,
security,
job control
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