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The Intel 80387 (387 or i387) was the math coprocessor
Coprocessor

A coprocessor is a computer processor used to supplement the functions of the primary processor . Operations performed by the coprocessor may be floating point arithmetic, graphics, signal processing, string processing, Savitsky-Golay derivation, or encryption....
 for the 80386
Intel 80386

The Intel 80386, otherwise known as the i386 or just 386, is a microprocessor which has been used as the central processing unit of many personal computers and workstations since 1986....
 series of microprocessor
Microprocessor

A microprocessor incorporates most or all of the functions of a central processing unit on a single integrated circuit . The first microprocessors emerged in the early 1970s and were used for electronic calculators, using Binary-coded decimal arithmetic on 4-bit Word ....
s, and the first Intel coprocessor to implement the IEEE 754 standard in every detail. It was used to perform floating point
Floating point

In computing, floating point describes a system for numerical representation in which a String of digits represents a rational number.The term floating point refers to the fact that the radix point can "float": that is, it can be placed anywhere relative to the Significant figures of the number....
 arithmetic operations directly in hardware. The i387 was compatible only with the standard i386 chip; the cut down i386SX had its own coprocessor, the Intel 80387SX
Intel 80387SX

The Intel 80387SX is the math coprocessor for the Intel 80386SX microprocessor. It was used to perform floating point arithmetic operations directly in hardware....
, that could work with the SX's narrower data bus.






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The Intel 80387 (387 or i387) was the math coprocessor
Coprocessor

A coprocessor is a computer processor used to supplement the functions of the primary processor . Operations performed by the coprocessor may be floating point arithmetic, graphics, signal processing, string processing, Savitsky-Golay derivation, or encryption....
 for the 80386
Intel 80386

The Intel 80386, otherwise known as the i386 or just 386, is a microprocessor which has been used as the central processing unit of many personal computers and workstations since 1986....
 series of microprocessor
Microprocessor

A microprocessor incorporates most or all of the functions of a central processing unit on a single integrated circuit . The first microprocessors emerged in the early 1970s and were used for electronic calculators, using Binary-coded decimal arithmetic on 4-bit Word ....
s, and the first Intel coprocessor to implement the IEEE 754 standard in every detail. It was used to perform floating point
Floating point

In computing, floating point describes a system for numerical representation in which a String of digits represents a rational number.The term floating point refers to the fact that the radix point can "float": that is, it can be placed anywhere relative to the Significant figures of the number....
 arithmetic operations directly in hardware. The i387 was compatible only with the standard i386 chip; the cut down i386SX had its own coprocessor, the Intel 80387SX
Intel 80387SX

The Intel 80387SX is the math coprocessor for the Intel 80386SX microprocessor. It was used to perform floating point arithmetic operations directly in hardware....
, that could work with the SX's narrower data bus. The coprocessor was released in 1987, two years after the 386 chip. It included much improved speed and commands over previous FPUs (80287 and 8087). The 80387 included full coverage of the trigonometric functions, Intel's previous offerings being limited to an argument range of plus or minus 45 degrees.

See also

  • x87
    X87

    x87 is a math-related instruction subset of the x86 architecture of Central processing unit. It is so called because initially such instructions were processed by an coprocessor#Intel coprocessors chip 8087....


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