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From: John R Pierce
To: Mailing List Recipients
Subject: Re: PCI slots
Date: 1997-01-15 18:16
Priority: 3
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Date: Wed, 15 Jan 1997 15:16:46 -0800
From: John R Pierce <pierce@hogranch.com>
Subject: Re: PCI slots
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At 02:08 PM 1/15/97 -0500, Dunlap, Randy wrote:
>I am looking for PCs (x86 CPUs) with a minimum of 6 slots,
>preferably more. If anyone has knowledge or information
>on this subject, please email me or the pci-sig reflector.
More that 4 slots requires a PCI bridge, as the PCI bus only allows 10
loads, the host bridge uses one load, the ISA/IDE bridge uses another,
and
each slot requires 2 loads. If there are additional PCI peripherals on
the
motherboard (such as a PCI scsi interface) this reduces the number of
available loads. There are motherboards out there that violate this
spec...
I wouldn't use them. Furthermore, the common triton family of
PCIchipsets
only supports arbitration on 4 masters.
Just happened to notice a new motherboard from SuperMicro with dual P6's
and
8 PCI slots (plus 3 ISA slots). 4 of these PCI slots are behind a
i960RP
coprocessor-bridge. Presumably this is setup as a straight bridge by
default, the data sheet says something about it running a WindRiver rtos
or
some such..
This puppy looks like it will require a custom case as the additional 4
slots are about where the power supply would normally be.
http://www.supermicro.com I think it was the P6DNE or something
similar.
-jrp
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