The keyboard and the mouse device are connected to the (personal system) ps/2 port of the computer. These ports are located at the back side of the system. The ps/2 port is a round shaped port usually located below the power supply of the system. The keyboard is usually connected to the PS/2 port or DIN 5 port and the mouse is connected to the serial or PS/2 port.The PS/2 port contains 6 holes and a notch in the middle of the port to which the keyboard and the mouse are connected.
Power supply connectors
Each power supply has special power connectors that connect to the motherboard which gives supply to the processor, memory and expansion boards. Attaching these connectors improperly can damage to both the motherboard and powersupply.
Serial and parallel port connectors
The most basic communication ports in any system are the serial and parallel ports and these ports continue to be important. Generally 9 pin serial port connector and 25 pin parallel port connector are used to convert various I/O devices.
Universal Serial Bus (USB)
The USB port is a rectangular port that is used to conncect a variety of external devices to the system. The USB port also supplies power to the device such as the Web camera, if the device does not use and external power source. To use the USB device yoy must just plug the device into the USB port , as most USB devices offer plug-and-play support.
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