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Tuesday, 7 November 2017

What Is USB ?

The USB (Universal serial bus) become the most popular external connection for PCs both IBM-compartible and macintosh first USB has several features that have led to its popularity first USB is a hot swappable bus this means that users can simply plugging the device without rebooting the PC a second feature is its ease of use daisy chained device today most new computers feature at least four USB port with two often in the front of the PC

IEEE 1894(Fire Wire)
Like the USB standard the IEEE 1394 (Fire Wire) standard extend the computer bus to many peripheral devices through a single port beacuase IEEE 1392 complaint technology is so expensive however it is not expected to become the dominate bus technology data through put devices to the system bus.

EXPANSION SLOT AND BOARDS






PCs designed so that users can adapter or configure the machine to their to own particular needs Pc mother board have two or more empty expansions slots which are expansions of the computers bus that provide a way to add new components to the computer. The slots accept expansions board also called card adapter or sometimes just boards The board is being attached to mother board the systems board to which the CPU memory and other components are attached
adapters that serve input and out purpose provide a port to which device can be attached and as translators between the bus and the device itself some controller is a card that provide a port on the back of the PC into you can plug the monitor its also contains and manages the video memory and does not processing required to display images on the monitor similar devices includes sound cards,internal modems or fax/modems and networks interface card.



PCs Card


Another type of the expansions card is the PC card intially called a personal computer memory card international accoiaciation or PCMCIA card its is a small device about the size of a credit card
this device was designed initially for use in notebook computers and other computers that are too small to.

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