> >>>>> "Steve" == Steve Underwood <steveu@infowebtelecom.com> writes:
>
> Steve> There is a proper standardised 66MHz variant of PCI, which is
> Steve> used on a lot of Alpha, and (I think) Xeon boards. There's
> Steve> 64bit PCI, too, with an extra connector for the extra
> Steve> lines. Most dedicated x86 users seem unaware of these.
>
> Steve> 66MHz PCI is actually somewhat troublesome. Most real 66MHz
> Steve> implementations seem to have just 2 card slots per bus. That
> Steve> only just scrapes through the definition of a bus. Add more
> Steve> slots and things get flakey.
>
> So you add more PCI busses.
Of course that is exactly when the 66MHz PCI machines have to do. You see a
row of 66MHz PCI connectors, but they are actually broken into several small
busses. More busses means more drivers and wiring. That means more cost. That
means 66MHz doesn't go mainstream. Sad, ain't it?
Steve
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