Cyrix FasMath CX-83D87 80387 replacement with 386/Unix

jrh jrh at mustang.UUCP
Fri Dec 1 06:05:12 AEST 1989

In article <1989Nov29.215150.53 at jdyx.UUCP>, tpf at jdyx.UUCP (Tom Friedel) writes:
> Has anyone used this chip with 386/ix?  From the manual, "Cyrix
> CX-83D87 is a CMOS VLSI integrated circuit that is pin compatible
> and software compatible with the 80387, yet ... achieves 4 to 10
> times greater performance ... by implementing floating point primitives
> operation in hardware."  
> Given one floating point intensive process (a ray trace) I am 
> wondering what performance difference I would see?

Well, there is an article in Info World (11/27/89) reporting that Intel is
disputing the compatibility claims of coprocessors from other vendors.  A
couple cited in the article were the IIT-2C87 and the Cyrix Fasmath 83D87.
Interestingly, the article states that Cyrix has released a report claiming
to have "identical numerical and status results" to the chip compared to the
GET THIS >>>>> Intel 80287.  Notice that the comparison reported is not to the
80387.  I personally don't know either way, but that's the guts of the article.

| James R. Howard                | Insert Standard Disclaimer Here...    |
|!dell!mustang!jrh |                                       |

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