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DEFINITION COMPUTER :
An electronic device operating under control of program (instruction) stored in its own memory.

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COMPUTER SYSTEM:
A complete working computer that include operating system,software and hardware to make the computer function.

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DATA :
Collection of unprocessed items which can include text ,numbers, images ,audio and video.

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INFORMATION:
Collection of data that has been processed into useful form.

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COMPUTER SYSTEM
System Unit
-a computer case
-is a case that contains electronic components of the computer used to process data.

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MOTHERBOARD
•main circuit board of the system unit ,that contains integrated circuits.

Function:
•holds many components of the system.
•provides connectors for other peripheral.

Component of motherboard:
•processor slot
•adapter card slot
•memory slot

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MEMORY
-consists of electronic components that store instructions waiting to be executed by the processor.

Memory:
1)volatile -temporary [RAM]
2) nonvolatile permanent and cannot modify [ROM]

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STORAGE
>holds data,instructions and information for future use.

Types of storage:
>magnetic storage
Eg.Hard disk,floppy disk
>optical storage
Eg.CD,DVD and BD
>flash storage
Eg.Solid state drives[SSDs],Memory card and USB flash drives

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ADAPTER CARD
-enhances functions of a component of the system unit and/or provides connections to the peripherals.

Types of adapter card:
1.FireWire
2.MIDI
3.USB
4.MODEM

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PROCESSOR
~central processing unit(CPU) , interprets and carries out the basic instructions that operate a computer.

Components of processor:
~control unit [directs and coordinates most of the operations in the computer]
~arimetic logic unit [perform arithmetic,comparison and other operations]

Machine cycle:
1.Fetch
2.Decode
3.Execute
4.Store

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INPUT AND INPUT DEVICE

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OUTPUT AND OUTPUT DEVICE