Intel 80287: Difference between revisions
imported>George Swan m (oops) |
imported>George Swan (add reference) |
||
| Line 23: | Line 23: | ||
The 80287 was introduced in 1982. | The 80287 was introduced in 1982. | ||
[[Integer arithmetic]] requires much less [[silicon real estate]] to implement than calculations on values that had a [[Fraction (mathematics)|fraction]]al component. 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 80286, and without an 80287. | [[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> | ||
{{cite news | |||
| url=http://www.olympusmicro.com/micd/galleries/chips/intel387.html | |||
| title=Intel 387 Math Coprocessor | |||
| publisher=[[Olympus Micro]] | |||
| author=Omar Alvarado, Thomas J. Fellers, Michael W. Davidson | |||
| date= | |||
| accessdate=2008-11-27 | |||
| quote= | |||
}} [http://www.webcitation.org/query?url=http%3A%2F%2Fwww.olympusmicro.com%2Fmicd%2Fgalleries%2Fchips%2Fintel387.html&date=2008-11-28 mirror] | |||
</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 80286, and without an 80287. | |||
If the 80287 were present floating point instructions would be off-loaded and executed relatively quickly, by the 80287. | If the 80287 were present floating point instructions would be off-loaded and executed relatively quickly, by the 80287. | ||
Revision as of 23:09, 27 November 2008
The intel 80287 was a floating point co-processor to intel's 80286 models of single chip computer.[1][2] The 80287 was introduced in 1982.
Integer arithmetic requires much less silicon real estate to implement than calculations on values that had a fractional component.[3] 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 80286, and without an 80287. If the 80287 were present floating point instructions would be off-loaded and executed relatively quickly, by the 80287.
The intel 80287 is reported to use the same execution unit as the intel 8087.[2]
Other chips which were lineal ancestors to the Pentium family of computer chips, the intel 80186 and the intel 80386, had a companion floating point co-processor manufactured to accompany it. Intel was to market an intel 80487. But it was not a separate chip, different from the intel 80486.
References
- ↑ Advanced Micro promotes its power-saving answers to intel 80287 in the UK, Computer Business Review, 1990-08-22. Retrieved on 2008-11-27. mirror
- ↑ 2.0 2.1 intel 80287: Technical Specification. Retrieved on 2008-11-27. mirror
- ↑ Omar Alvarado, Thomas J. Fellers, Michael W. Davidson. Intel 387 Math Coprocessor, Olympus Micro. Retrieved on 2008-11-27. mirror