microcomputer

/muy"kroh keuhm pyooh'teuhr/, n.

a compact and relatively inexpensive computer, with less capacity and capability than a minicomputer, consisting of a microprocessor and other components of a computer, miniaturized where possible: used in small business, by hobbyists, etc. Cf. home computer, mainframe, personal computer.

[1970-75; MICRO- + COMPUTER]

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Small digital computers whose CPU is contained on a single integrated semiconductor chip.

As large-scale and then very large-scale integration (VLSI) have progressively increased the number of transistors that can be placed on one chip, the processing capacity of microcomputers has grown immensely. The personal computer is the most common example of a microcomputer, but high-performance microcomputer systems are widely used in business, in engineering, and in "smart" machines in manufacturing. See also integrated circuit, microprocessor.

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      an electronic device with a microprocessor as its central processing unit (CPU). Microcomputer was formerly a commonly used term for personal computers (personal computer), particularly any of a class of small digital computers (digital computer) whose CPU is contained on a single integrated semiconductor chip. Thus, a microcomputer uses a single microprocessor for its CPU, which performs all logic and arithmetic operations. The system also contains a number of associated semiconductor chips that serve as the main memory for storing program instructions and data and as interfaces for exchanging data of this sort with peripheral equipment—namely, input/output devices (e.g., keyboard, video display, and printer) and auxiliary storage units. Smaller microcomputers first marketed in the 1970s contain a single chip on which all CPU, memory, and interface circuits are integrated.

      As large-scale integration and then very-large-scale integration have progressively increased the number of transistors (transistor) that can be placed on one semiconductor chip, so the processing capacity of microcomputers using such single chips has grown commensurately. During the 1980s microcomputers came to be used widely in other applications besides electronic game systems and other relatively simple computer-based recreations. Increasingly powerful microcomputers began to be used in personal computer systems and workstations, for instance. High-performance microcomputer systems are used widely in business, in engineering, in “smart” or intelligent machines employed in the factory and office, and in military electronics systems.

 In the early 1990s, small computers that fit in a pocket yet provide the power of a desktop personal computer were introduced. These pocket, or palm-sized, computers, commonly known as personal digital assistants (PDAs), are distinguished by their high portability, enhanced performance, and low cost. Similarly, microprocessors began finding their way into cellular telephones and portable MP3 music players.

      As personal computers started including multiple processors in the 2000s, microcomputer began to be relegated to descriptions of small “embedded” computers found in various electronic devices.

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