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VGA
DVI
SATA and eSATA
IDE
USB(Most used)
Firewire
Ethernet
PS2

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Varius ports and connectores are used to connect input , output, storage, and networking devices. Using standard ports allows hardware devices to be compatible with many different systems.

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*ASCII
*Unicode
*Plain text
*Graphics standars

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*Magnetic disks:are the most comon type of secondary storage.they consist of a series of disjk platters spinning at up 10.000 rpm inside the case.
*Magnetic tapes: are used by organisations that must handlelarge amounts of dara and are used to maninly for bancking up and archving data.
*Optical storage:Optical diskslike cds, dvds, and blu-ray disk and storare data.
*Flash memory:is a technology that stores data using electronic logic dates.

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*Random Access memory:is a temporaly sorage area for programs and data are being used in a given moment
*Read Only Memory: is a type of primary storage whose contents cannot be changed.Because of this, the contents of ROM are programmed at the time of manufacture

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*Microprocessors
*Clock Speed
*MIPS
*Multicore processors
*Motherboards

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*Vision impaired users
*Mobility Problems

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*Screens:are found in almost all computer sistems
*Speakers: come in many forms, from simple ear phones to complex multi speakers arrangements.
*Printers-Laser: Produced very high quality hard-copy output. The print rate per page is very quick if a large number of pages are being printed. It is used in a office

Inkjet printers:Are used to produce goodquality hand copies. It is used where low output volumes are required.

Dot Matrix printers: Are type of impact printer where a print head presses       againt an inked ribbon. It is used in nysy environment, garare and workshops

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*Keyboards:it is present on virtually  and it is  used to write in the computer.
*Concept keyboards:have each key is programmed toperformacustomfunction. Typically there not present  . Keys such as numbers and letters
*Soft keyboards:is a keyboard that is represented by series of buttons drawn on a monitor  screen
*Mice:is the standard mouse pointing device on most desktop computers. Atypical computer muse has two buttons and many also have scroll wheel in the Centre to perform tasks like scrolling’s through documents or web pages.
*Trackballs:Consist of a relatively large ball which is fixed in place so that the user can spin it around, control ling a pointer on the screen.
*Touch pads:Are common input devices on laptops, where there is usually not enough space for a mouse. As well as the moving the pointer by tracing their finger across the touch pad.
*Touch screens:
*Microphones:Allows sound data to be input into the computer, Many laptops have microphones built in to them, and external microphones can also be used.
*Game controllers:Joysticks and game pads are two common input devices used by games players. There are many different configurations variable that include a variety of buttons and features.
*Barcode scanners:Uses a laser to shine light onto the a bar code label. The thickness of the lines and the spacing between the lines on the barcode determinate the amount of reflected light
*Magnetic stripe
Smart Cards:Are plastic credit card style cards that differ from normal dumb magnetic stripe cards by having a higher storage capacity and an embedded processor

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*Supercomputers:Represent the cutting edge of computing technology. They are the largest, fastest, most powerful and most expensive computers, incredibly high processing multiprocessing, it has thousands of separate processors and finally it has thousands of gigabytes of primary storage space.

*Mainframes:Are similar to super computers but the mainframes are of difference of the supercomputers, the main frames are optimized for high data throughput. They are able to read extremely large amount of data from storage.
*Desktop compuers: | Have been fallen significantly in price in the last decade. Desktop computers are common in homes, offices, and schools because they are relatively cheap compared to the laptop.
*Laptop computers:It is a portable computers from those designed for simple internet access and word processing.

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