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An introduction to the functional units of a computer system, including the input unit, central processing unit (CPU), output unit, and storage unit. the roles and functions of each unit, as well as the hierarchy of storage devices and the concept of primary and secondary storage. The document also mentions various types of input devices, output devices, and storage devices, such as keyboards, microphones, mice, speakers, magnetic disks, magnetic tapes, RAM, ROM, PROM, EEPROM, flash drives, memory cards, and various types of printers.
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