Monday, September 28, 2009

System Unit

Expansion Card

Also known as an add-on card, internal card or interface adapter, an expansion card is an electronic board or card added in a desktop computer or other non-portable computer to give that computer a new ability, such as the ability to connect to another computer using a network cable. Below is a list of expansion cards that could be installed in a an available expansion slot.

Network Interface Card
A network interface card is used to connect a computer to an Ethernet network. The card provides an interface to the media. This may be either using an external transceiver or through an internal integrated transceiver mounted on the network interface card PCB. The card usually also contains the protocol control firmware and Ethernet Controller needed to support the Medium Access Control (MAC) data link protocol used by Ethernet.

Cache Memory
Cache memory is random access memory (RAM) that a computer microprocessor can access more quickly than it can access regular RAM. As the microprocessor processes data, it looks first in the cache memory and if it finds the data there (from a previous reading of data), it does not have to do the more time-consuming reading of data from larger memory.

Plug & Play
plug and play is a term used to describe the characteristic of a computer bus, or device specification, which facilitates the discovery of a hardware component in a system, without the need for physical device configuration, or user intervention in resolving resource conflicts.Plug and play refers to both the traditional boot-time assignment of device resources and driver identification, as well as to hotplug systems such as USB and Firewire.
Sockets

Computer sockets use standardized protocols to communicate with the devices that are designed to plug into them. When protocols change, computer sockets are renamed, and manufacturers keep pace by designing products that utilize the newer protocols. Computer sockets in the 1980s were referred to as Integrated Drive Electronics (IDE) slots, followed by Enhanced IDE (EIDE) slots.

Chips

The modern computer chip saw its beginning in the 1950s through two separate researchers who were not working together, but developed similar chips. The first was developed at Texas Instruments by Jack Kilby in 1958, and the second was developed at Fairchild Semiconductor by Robert Noyce in 1958. These first computer chips used relatively few transistors, usually around ten, and were known as small-scale integration chips. As time went on through the century, the amount of transistors that could be attached to the computer chip increased, as did their power, with the development of medium-scale and large-scale integration computer chips. The latter could contain thousands of tiny transistors and led to the first computer microprocessors.
There are several basic classifications of computer chips, including analog, digital and mixed signal varieties. These different classifications of computer chips determine how they transmit signals and handle power. Their size and efficiency are also dependent upon their classification, and the digital computer chip is the smallest, most efficient, most powerful and most widely used, transmitting data signals as a combination of ones and zeros.
Today, large-scale integration chips can actually contain millions of transistors, which is why computers have become smaller and more powerful than ever. Not only this, but computer chips are used in just about every electronic application including home appliances, cell phones, transportation and just about every aspect of modern living. It has been posited that the invention of the computer chip has been one of the most important events in human history. The future of the computer chip will include smaller, faster and even more powerful integrated circuits capable of doing amazing things, even by today’s standards.

Slots

Slots are holes used to plug internal devices (sound/video cards...etc) into your computer. These will be found on the inside of your computer...and the devices you pug into the will have "ports" on them...which will be able to be accessed from the back of the computer like the other ones.

Buslines
The bus lines are the communicating electronic lines that connect different parts of the CPU to various other parts. In addition, the bus lines also link the CPU to different parts on the system board of your computer. The data flows in the form of bits along the bus lines. The bus lines are like multilane pathway which means that the more bus lines are on the system the greater is the rate of transfer of data along the bus, which means that the computer can run efficiently and will perform the operations at a faster rate.
Serial Port
A serial port is a serial communication physical interface through which information transfers in or out one bit at a time.


Parallel Port
A parallel port is a type of interface found on computers (personal and otherwise) for connecting various peripherals. It is also known as a printer port or Centronics port.
Universal Serial Bus
USB (Universal Serial Bus) is a popular hardware interface that allows users to attach secondary hardware devices to their computer in a Plug-and-Play fashion.A single USB port can connect more than one hundred interchangeable devices such as modem, keyboard, mouse, joysticks, scanners, printer, digital cameras, and external storage.
Firewire Port
FireWire is a type of Serial Port which uses the serial bus interface standard for high speed data transfer. e.g connecting camcorders with PC.

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