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Proessing Devices (System Unit)


when you have a conversation with a friend,your ear acts as the input device. It receives the information your friend gives you and passes on yhe information to your brain. Your brainacts as the processing device. It understands the information and frames an appropriate response. The mouth acts as the output device and gives a reply to your friend.
Similarly, in a computer,device, such as the keyboard and the mouse are input devices. The box-like structure called the system unit is responsible for all the processing required  to convert the input to the required output. Devices ,such as the monitor and the printer are output devices. These input and output devices attached to your computer need to conncet to a component within your system unit to allow data to flow. For exemple, the monitor is connected to a video card and the speakers to a sound card. The video card and the the sound card, in turn, reside on the motherboard tofether with the processor, memory and optional internal I/O devices, such as a network interface card.
Motherboard
The system unit contains a large board that has anumber of tiny electronic circuits and other components. It is known as the motherboard. The motherboard is a very important part of the system unit and houses several vital compenents of the computer.
The microprocessor is the the most important component of the motherboard. Data is recived from the input devices. The actual processing of data, that is the arithmetic or logical operations on the giver data,occurs in the microprocessor. Finally, the processed information is the output devices depicts the working of a computer.
Video Card
A video card plugs into a personal computer to give it display capabilities. In other words, it enables your computer to represent data in a visual form. Video cards are also called video adapters, video boards, video display boards, graphics cards and graphics adapters. Each adapter provides digital-to-analog conversion, video RAM and a vider controller so that can be sent to a computer’s display.
Sound card
A sound card is a device in the system unit that enables a computer to accept, process and play sound, A sound card enabl4es the computer to record sound through a microphone. Manipulate sound stored on a disk and output the sound through speakers.

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