| Did you know?
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| Of all the 286 and 386 math coprocessors designed by the different manufacturers, the coprocessors designed by Cyrix were the fastest and gave the most accurate results.
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| Coprocessor articles |
| Introduced | : | 1983 by Intel | | Manufacturers | : | AMD, Cyrix, IIT, Intel | | Adress / databus | : | 16bit / 16bit | | Performance | : | ~65.000 FLOPS | | Package | : | 40pin DIP | | # transistors | : | | | Manufacturing process | : | NMOS & CMOS, 1500nm | | For use with | : | 286 & 386SX | | Frequency | : | 4 – 20MHz | |  |
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AMD
- AMD P80C287-10
- AMD P80C287-12
Cyrix
- CX-82S87-NP-SV
- CX-82S87-PP-SV
- Cyrix 287XL
- Cyrix 287XLT
IIT
- IIT 2C87-6
- IIT 2C87-8
- IIT 2C87-10
- IIT 2C87-12
- IIT 2C87P-12
- IIT 2C87-20
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Intel
- C80287-3
- C80287XL
- D80287-6
- D80287-8
- D80287-10
- D80C287A-12
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![](javascript:openImageWindow("http://web.archive.org/web/20070920143530/http://www.cpu-info.com/img/cpu/80287/CoreIntel287XLL.jpg","Intel C80287XL Die"))
![](javascript:openImageWindow("http://web.archive.org/web/20070920143530/http://www.cpu-info.com/img/cpu/80287/iC80287-3-L.jpg","Intel C80287-3"))
![](javascript:openImageWindow("http://web.archive.org/web/20070920143530/http://www.cpu-info.com/img/cpu/80287/IIT2C87-20-L.jpg","IIT 2C87-20"))