System Unit

RAM






RAM OR ALSO  KNOWN AS RANDOM ACCESS MEMORY IS A COMPUTER MEMORY THAT HOLDS DATA that is any byte of memory can be accessed without touching the former bytes. RAM is the most common type of memory found in computers and printers and other devices.






CACHE MEMORY

Cache memory trasparently stores data so that data for the future can be served faster. When a cache is been used. there must a way in which the memory controllet defines whether the value currently being addressed in memory is avalaible from the cache.



ROM



Read-Only Memory(ROM) is known as a class of storage medium that can be used in computers and other devices. Any data that is stored in the ROM cant be modified because the main idea is to distribute firmware.



FLASH MEMORY






Flash memory is a chip that can be reprogrammed and electrically erased. It is found in memory cards, USB flashdrivers,Mp3 players and many more.The main idea is to transfer data and store it from the computer to other various electronic devices.

GRAPHIC CARD

• A graphic card is an expansion card that consists of video card, video adapter, graphics-accelerator card.Its function is to generate and output images to a display.

SOUND CARD




Basically a sound card is an internal computer expansion card that provides the input and output of audio signals to and from a computer under control of computer programs. This term is also applied to external audio interfaces that use software to generate sound. The use of sound cards include providing the audio component for multimedia applications such as music, editing video or audio, presentation, entertainment  and video projection. Most computers have built in sounds, while others require additional expansion cards to provide for audio capability.








NETWORK INTERFACE CARD


 Network Interface Card(NIC) is an expansion board that you can insert into a personal computer so that it can  be connected to a network. Most NICs are built for a particular type of network, protocol and media although some can serve multiple networks.





PLUG AND PLAY






Plug and Play (PnP) is a skill developed by Microsoft for its Windows 95 and other operating systems that gives users the ability to plug a device into a computer and have the computer recognize that the device is there.  Plug and Play has been replaced by an open, industry standard, Universal Plug and Play (UPnP) which uses Internet protocols for continuous device plug-in.



SERIAL PORT






A serial port can be used for communication.Most serial ports on pesonal computers comform to certain standards.A serial port is a general purpose interface that can be used for any type of device which includes modems,printers and mice.

PARALLEL PORT








A parallel port is a type of interface found on computers for connecting several peripherals. In computing, a parallel port is a communication physical interface. It is also known as a printer port. 


UNIVERSAL SERIAL BUS PORT






 USB port is a cable connection interface on personal computers and consumer electronics. USB ports allow stand-alone electronic devices to be connected via cables to a computer (or to each other). FIREWIRE PORT





Firewire ports are methods of a serial port that makes use of a Firewire technology to transfer data quickly from one electronic device to another.

ETHERNET PORT






An Ethernet port is an opening on computer network tool that Ethernet cables plug into. These ports are known as the jacks or sockets.


HIGH DEFINITION MULTIMEDIA INTERFACE





HDMI(High Definition Mutimedia Interface) is a design that combines video and audio into a particular digital interface for use with DVD players,DTV platers and othe audiovisual devices.