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When a program is run, i.e. put into operation, the computer executes checkbox the program step by step to process the data. The same program can be used with different sets of data.What is the brain of the PE6. Information in the form of programs and data is called software, but the pieces of equipment making up the computer system are known as hardware.7. The most important item of hardware is the CPU (Central Processing Unit). This is the electronic unit at the center of the computer system. It contains the processor and the main memory.8. The processor is the brain of the computer. It does all the processing and controls all the other devices in the computer system.9. The main memory is the part of the computer, where programs and data being used by the processor can be stored. However it only stores information while the computer is switched on and it has a limited capacity.10. All the other devices in the computer system, which can be connected to the CPU, are known as peripherals. These include input devices, output devices, and storage devices.11. An input device is aperipheral, which enables information to be fed into the computer. The most commonly used input device is a keyboard similar to a typewriter keyboard.12. An output device is a peripheral, which enables information to be brought out of the computer, usually to display the processed data. The most commonly used output device is a specially adapted television known as a monitor or VDU (Visual Display Unit). Anothercommon output device is a printer. This prints the output of the CPU onto paper.5. (A) storage device is a peripheral used for the permanent storage of information. It has a much greater capacity than the main memory and commonly uses magnetic tape or magnetic disks as the storage medium.6. These are the main pieces of hardware of any computer system whether a small "micro" or a large mainframe system.
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