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Supercomputers represent the cutting edge of computing technology. they are the largest,fastest, most powerful and more expensive computers available.

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A soft keyboeard is a keyboard that is represented by a series of buttons drawn on a monitor or screens

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On a concept keyboard each key is programmed to perform a custom funcion

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sMost computer user are familiar with the standar QWERTY keyboards that  is present on virtually all laptop and desktop computers

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Printers produce hard copies of documents and files.

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Speakers come in forms, from simple ear phones to complex multi- speakers arrangements.

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Screens are an output device found in all computers.

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Secondary storage is a trade-off between high performance and economical long-term archiving. Because it is accessed less frequently, data can be migrated to secondary storage devices with lower performance and costs.

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Primary storage, also known as main storage or memory, is the area in a computer in which data is stored for quick access by the computer's processor

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Primary storage, also known as main storage or memory, is the area in a computer in which data is stored for quick access by the computer's processor

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this will covers the tangible, physical parts of the computer which work together to input proces, store, and output data.

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-Vision impaired users
-Mobility Problems

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-Magnetic Disks
-Magnetic tapes
-Optical storage
-Flash Memory

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-Random Access Memory
-Read Only Memory

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-Microprossesors
-Clock Speed
-MiPS
-Multicore Processors
-Motherboards

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-Screens
-Speakers
-Printers

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-ASCII
-Unicode
-Plain tect
-Graphics standars

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-Keyboards
-Concept keyboards
Soft keyboeards-
-Mice
-Trackballs
-Touch pads
-Touch screens
-Microphones
-Gmame controllers
-Magnetic stripe Readers
-Barcode scanners
-Radio Frequency
-Radio tags
-Web cams
-Digital cameras
-sensors and probes
-Smarts cards
-Optical Mark Recognition
-Magnetic ink Character

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-Supercomputers
-Mainframes
-Desktop computers
-Laptop computers
-Netbooks
-Personal Digital assistance
-Smart Phones
-Embedded systems