Intel 8087: Difference between revisions
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The '''intel 8087''' was a [[floating point co-processor]] to [[intel (manufacturer)|intel]]'s [[intel 8088|8088]] and [[intel 8086|8086]] models of [[single chip computer]]. | The '''intel 8087''' was a [[floating point co-processor]] to [[intel (manufacturer)|intel]]'s [[intel 8088|8088]] and [[intel 8086|8086]] models of [[single chip computer]].<ref name=CpuWorld> | ||
Both the 8088 and 8086 implemented the [[intel | {{cite news | ||
| url=http://www.cpu-world.com/CPUs/8087/ | |||
| title=Intel 8087 family | |||
| publisher=CPU World | |||
| author= | |||
| date= | |||
| accessdate=2008-11-28 | |||
| quote= | |||
}} [http://www.webcitation.org/query?url=http%3A%2F%2Fwww.cpu-world.com%2FCPUs%2F8087%2F&date=2008-11-28 mirror] | |||
</ref> | |||
Both the 8088 and 8086 implemented the [[intel 8086 instruction set|8086 instruction set]], which included a subset of instructions for [[floating point operations]] -- arithmetic operations that might include fractions. | |||
[[Integer arithmetic]] requires much less [[silicon real estate]] to implement than calculations on values that had a [[Fraction (mathematics)|fraction]]al component.<ref name=OlympusMicro387> | [[Integer arithmetic]] requires much less [[silicon real estate]] to implement than calculations on values that had a [[Fraction (mathematics)|fraction]]al component.<ref name=OlympusMicro387> | ||
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| title=Intel 387 Math Coprocessor | | title=Intel 387 Math Coprocessor | ||
| publisher=[[Olympus Micro]] | | publisher=[[Olympus Micro]] | ||
| author= | | author=Omar Alvarado, Thomas J. Fellers, Michael W. Davidson | ||
| date= | | date= | ||
| accessdate=2008-11-27 | | accessdate=2008-11-27 | ||
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}} [http://www.webcitation.org/query?url=http%3A%2F%2Fwww.olympusmicro.com%2Fmicd%2Fgalleries%2Fchips%2Fintel387.html&date=2008-11-28 mirror] | }} [http://www.webcitation.org/query?url=http%3A%2F%2Fwww.olympusmicro.com%2Fmicd%2Fgalleries%2Fchips%2Fintel387.html&date=2008-11-28 mirror] | ||
</ref> | </ref> | ||
Intel off-loaded the hardware to perform those instructions to a [[co-processor]] -- a [[support chip]] devoted solely to that task. Computers could be equipped with an 8088 or 8086, and without an 8087. | Intel off-loaded the hardware to perform those instructions to a [[co-processor]] -- a [[support chip]] devoted solely to that task.<ref name=IntelAndFloatingPoint> | ||
{{cite news | |||
| url=http://www.intel.com/standards/floatingpoint.pdf | |||
| title=Intel and Floating Point: Updating One of the Industry’s Most Successful Standards | |||
| publisher=[[intel (manufacturer)|intel]] | |||
| author= | |||
| date= | |||
| accessdate=2008-11-28 | |||
| quote= | |||
}} | |||
</ref> | |||
Computers could be equipped with an 8088 or 8086, and without an 8087. | |||
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When the 8088 or 8086 [[central processing unit]] encountered a floating point instruction it would be executed by the CPU, slowly, in firmware. | When the 8088 or 8086 [[central processing unit]] encountered a floating point instruction it would be executed by the CPU, slowly, in firmware. | ||
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Later chips, lineal descendants to the 8086, the [[intel 80186|80186]], [[intel 80286|80286]] and [[intel 80386|80386]] had a companion floating point co-processor manufactured to accompany them. | Later chips, lineal descendants to the 8086, the [[intel 80186|80186]], [[intel 80286|80286]] and [[intel 80386|80386]] had a companion floating point co-processor manufactured to accompany them. | ||
Intel was to market an [[intel 80487]]. But it was not a separate chip, different from the [[intel 80486|80486]]. | Intel was to market an [[intel 80487]]. But it was not a separate chip, different from the [[intel 80486|80486]]. | ||
==References== | |||
<references/> | |||
Latest revision as of 00:29, 28 November 2008
The intel 8087 was a floating point co-processor to intel's 8088 and 8086 models of single chip computer.[1] Both the 8088 and 8086 implemented the 8086 instruction set, which included a subset of instructions for floating point operations -- arithmetic operations that might include fractions.
Integer arithmetic requires much less silicon real estate to implement than calculations on values that had a fractional component.[2] Intel off-loaded the hardware to perform those instructions to a co-processor -- a support chip devoted solely to that task.[3] Computers could be equipped with an 8088 or 8086, and without an 8087. If the 8087 were present floating point instructions would be off-loaded and executed relatively quickly, by the 8087.
Later chips, lineal descendants to the 8086, the 80186, 80286 and 80386 had a companion floating point co-processor manufactured to accompany them. Intel was to market an intel 80487. But it was not a separate chip, different from the 80486.
References
- ↑ Intel 8087 family, CPU World. Retrieved on 2008-11-28. mirror
- ↑ Omar Alvarado, Thomas J. Fellers, Michael W. Davidson. Intel 387 Math Coprocessor, Olympus Micro. Retrieved on 2008-11-27. mirror
- ↑ Intel and Floating Point: Updating One of the Industry’s Most Successful Standards, intel. Retrieved on 2008-11-28.