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microprocessor |
2 definitions found From WordNet r 1.6 [wn]: microprocessor n : an integrated circuit semiconductor chip that performs the bulk of the processing and controls the parts of a system; "a microprocessor functions as the central processing unit of a microcomputer"; "a disk drive contains a microprocessor to handle the internal functions of the drive" From The Free On-line Dictionary of Computing (13 Mar 01) [foldoc]: microprocessor(Or "micro") A computer whose entire {CPU} is contained on one (or a small number of) {integrated circuits}. The important characteristics of a microprocessor are the widths of its internal and external {address bus} and {data bus} (and instruction), its {clock rate} and its {instruction set}. Processors are also often classified as either {RISC} or {CISC}. The first commercial microprocessor was the {Intel 4004} which appeared in 1971. This was the CPU member of a set of four {LSI} {integrated circuits} called the MCS-4, which was originally designed for use in a calculator but was marketed as "programmable controller for logic replacement". The 4004 is referred to as a 4-bit microprocessor since it processed only 4 bits of data at a time. This very short word size is due mainly to the limitations imposed by the maximum integrated circuit density then achievable. As integrated circuit densities increased with the rapid development of integrated circuit manufacturing technology, the power and performance of the microprocessors also increased. This is reflected in the increase in the CPU word size to 4, 8, 16, and by mid-1980s, 32 bits. The smaller microprocessors have relatively simple {instruction sets}, e.g., no {floating point} instructions, but they are nevertheless suitable as controllers for a very wide range of applications such as car engines and microwave ovens. The {Intel 4004} was followed with among others the {4040}, {8080}, {8086}, {80186}, {80286}, {80386}, {486} and {Pentium}. Other families include the {Motorola} {6800} and {680x0} families, {National Semiconductor} {NS16000} and {NS32000}, {SPARC}, {ARM}, {MIPS}, {Zilog Z8000}, {PowerPC} and the {Inmos} {Transputer} family. The larger, more recent microprocessors families have gradually acquired most of the features of large computers. As the microprocessor industry has matured, several families of microprocessors have evolved into de facto industrial standards with multiple manufacturers and numerous support" chips including {RAM}, {ROM}, {I/O controllers} etc A single chip microprocessor may include other components such as memory ({RAM}, {ROM}, {PROM}), {memory management}, {caches}, {floating-point unit}, input/output ports and timers. Such devices are also known as {microcontrollers}. The one-chip microcomputer is in many respects, a landmark development in computer technology because it reduces the computer to a small inexpensive, and easily replaceable design component. Microcomputers have given rise to a new class of general-purpose machines called {personal computer}s. These are small low cost computers that are designed to sit on an ordinary office desk or to be portable and fuelled the computer boom of the late 1980s. The most widespread example is the also {IBM PC}, based on microprocessors from {Intel Corporation}. {Apple Computers, Inc.} have also produced a range of personal computers, as have several other companies. See also {killer micro}, {minicomputer}, {CPU Info Center}. (1996-11-26)
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