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Functional elements.
A typical digital computer system has four
basic functional elements: (1) input-output equipment,
(2) main memory, (3) control unit, and (4)
arithmetic-logic unit. Any of a number of devices is
used to enter data and program instructions into a computer
and to gain access to the results of the processing
operation. Common input devices include keyboards and
optical scanners; output devices include printers and
cathode-ray tube and liquid-crystal display monitors.
The information received by a computer from its
input unit is stored in the main memory or, if not for
immediate use, in an auxiliary storage device. The
control unit selects and calls up instructions from the
memory in appropriate sequence and relays the proper
commands to the appropriate unit. It also synchronizes
the varied operating speeds of the input and output
devices to that of the arithmetic-logic unit (ALU) so as
to ensure the proper movement of data through the entire
computer system. The ALU performs the arithmetic
and logic algorithms selected to process the incoming
data at extremely high speeds--in many cases in
nanoseconds (billionths of a second). The main memory,
control unit, and ALU together make up the central
processing unit (CPU) of most digital computer
systems, while the input-output devices and auxiliary
storage units constitute peripheral equipment.
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