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Today's computers have at least one CPU that performs all calculations and includes a main memory, a control unit, and an arithmetic logic unit. Auxiliary data storage is usually provided by an on-board hard disk and may be supplemented by other media such as floppy disks or CD-ROMs. Peripheral equipment includes input devices (e.g. keyboard, mouse) and output devices (e.g. monitor, printer), aswell as the circuitry and cabling that connect all the components. Generations of modern computers are characterized by their technology.
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