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9 Cards in this Set
- Front
- Back
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Operating system
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(OS) is a set of program containing instruction thy work together to coordinate all the activities among computer hardware resources.
- start & shut off computer - providing a user interface - managing programs - coordinating tasks - configuring devices - establish internet connection - monitoring performance - providing file management - automatically updating - utility program |
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Starting and restarting a computer
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Starting and restarting a computer called booting
Turn on a computer completely off are performing a cold boot Restart a computer are performing warm boot Warm boot closes any running process and program |
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1st step
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Turn on computer, power supply sends an electrical signal to the component in the system unit.
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2nd step
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The charge of electricity causes the processor chip reset itself and find BIOS (basic input/ output system) contains computer start up instruction.
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3rd step
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BIOS execute a series of tests to make sure the computer hardware is connected properly an operating correctly. The tests called power on self test (POST) check various system components. Eg keyboard.
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4th step
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The POST reality compared with data in a CMOS chip. CMOS uses battery power to retain information when computer turn off. CMOS stores configuration information such as memory, hard disk and keyboard. It is also detect new devices.
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5th step
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POST complete successfully, the BIOS search specific operating system files called system file. BIOS may look first to see if USB plugged in a USB port or may it look directly on drive C for the system file.
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6th step
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Once it's located, system file load into memory (RAM) random access memory from storage and execute. Kernel of operating system loads into memory. Then the operating system in memory takes control of the computer.
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Final step
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Operating system load system configuration information.
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