> At 12:55 AM 2/27/2004 +0100, you wrote:
> >At 18.45 26/02/2004 -0500, you wrote:
> > >On Thu, 26 Feb 2004, Alan B. Pearce wrote:
> > >
> > >> And then in the MAXQ strengths, they list "prefixable opcode allows a
> > simple
> > >> means for instruction set extensions or enhancements".
> Anyone recall the
> > >> 8086 with the FPU and 8089 enhancements to the instruction set?
> > >
> > >Gads, you mean there is someone besides me who even REMEMBERS the 8089?
> >
> >Wasn't the 8089 an I/O chip?
>
> The i8087 was the math co-processor for the 8086/8.
>
> IIRC, the 80486DX (not the 80486SX) was the first Intel PC processor with
> the math co-processor on-chip.

        Maybe this is an urban legend or something but I seem to remember that the
486SX DID have the co-processor on die, it just wasn't enabled (that or it
failed qual and was disabled and sold as an SX). TTYL

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