OCR A Level Computer Science

1.2.1a: The need for, function and purpose of operating systems.

Keywords:
Software and software development
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KeywordDefinition
Device managementThe OS needs to control access to input, output and storage devices
Memory managementThe OS has to allocate sections of RAM to each process and reuse it after it's no longer needed
ProcessSoftware task with memory allocated for instructions and data
Processor managementThe OS needs to share CPU resources by scheduling time slots for each process
User interfaceThe OS needs to provide a user with the ability to control and view hardware and software resources
User managementThe OS needs to provide security and authentication to provide the right level of physical or remote access
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