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Computer systems can be discussed in two parts: hardware and software. The hardware is physical, electronic, and electro-mechanical devices. The hardware consists of Central Processing Unit (CPU), input devices and output devices. Input devices are used to provide data for the CPU. The keyboard is a common data input device. Data is sometimes entered on cards. The cards are read by an input device called a card reader. Output devices receive data from the CPU. The visual display unit (VDU) and printers are common output devices. Input devices, output devices and mass storage devices are collectively called Input-Output Devices, or peripherals. The software contains the programmes that control and coordinate the activities of the computer hardware and direct the processing of data.
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The cards are read by an input device called …
the keyboard
the visual display unit
the CPU
a card reader
