Back side of the system unit:
* Serial port: it is a general-purpose interface that can be used for almost any type of device, including modems, mouse or keyboard.
* Parallel port: It is usually used for connecting PC to a printer.
* USB port: It is a plug and play port on your pc. With USB, a new device can be added to your computer without additional hardware or even having to turn the PC off. A single usb can be used to connect to 127 peripheral devices.
* Power socket: It supplies electricity to the PC. A power cable is plugged into the power socket, which carries the power from the electrical outlet to the system unit and from the system unit to your monitor.
* Fan: The back of system unit has a fan which works like an exhaust fan. When you are working on the computer, its machinery produces a lot of heat. If this heat is not moving out ofthe System unit, it can cause havoc to PC. The fan stops this from happening. No sooner you switch on the computer; the fan starts to rotate and starts throwing out the heat from the system unit. The fan keeps on rotating by the time you do not switch off the computer.
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2) 104-Keys: Windows Keyboard windows button, context menu key.
3) Ergonomic: The ergonomic keyboard is designed keeping in mind for the physical comfort of the user.
4) Multimedia: It provides media control to play CD, DVD and MP3 files. It has special keys for accessing web browser, e-mail or music player at touch of button.
5) Cordless Keyboard
Keyboard Technology:
It uses a variety of switch technologies. These switches convert a typing action into a signal for the keyboard interfaces, so that the interface may know that key is pressed. The types of technologies