RE: Sort of OT: PCI Slot

["Dunn, Shannon G [COM]" <Shannon.Dunn(at)sprint.com>]

It seems I remember this to be some sort of bus-mastering issue that degraded the quality of the video card input. 

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From: owner-ds(at)Softimage.COM [mailto:owner-ds(at)Softimage.COM] On Behalf Of Hollis, Mark (NBC Universal)
Sent: Monday, January 09, 2006 12:39 PM
To: 'DS(at)Softimage.COM'
Subject: RE: Sort of OT: PCI Slot

Some years ago I read in Byte Magazine an article on how signals propagate across busses. They were discussing the S-100 bus and the ATA bus (The ATA was replaced by the PCI and now PCI-X). Apparently, the further the signal has to travel, the mor its square waveform gets distorted and many busses and cards use edge detection for signalling.

With a waveform that is supposed to be square that is seriously distorted by its distance from a source and with the speed that these busses are supposed to operate, it's small wonder there might be problems with certain slots.

 

A Caveat: This is from an article I read a long time ago. Also Compaq (after the ill-advised buyout) is "HP-Cheap" which means it's not built to be a first-tier computer so they may not have made them all that well -- there may be other reasons why the slot doesn't work well.

 

But it stands to reason that this may be a probable cause.

-----Original Message-----
From: owner-ds(at)Softimage.COM [mailto:owner-ds(at)Softimage.COM]On Behalf Of
Benoit Melancon
Sent: Monday, January 09, 2006 10:39 AM
To: DS(at)Softimage.COM
Subject: Re: Sort of OT: PCI Slot


Hello Ryan,

PCI 4 slot on the Compaq has always been labeled "do not use" in the DS
ACSR class ever since I care to remember, with PCI 2 pointed as a viable
alternative for cards such as the Emulex adapter if you wanted to plug
the ol' MediArray storage to your DS at the same time as using the
Adaptec or Atto card in the bottommost slot.

I'm afraid I don't have the technical explanation for that limitation
though.

Hope this helps,

Benoit



Gregory, Ryan wrote:
> Hello all,
> I am trying to put a firewire card into my DS. Compaq EVO W8000. I have an
> external lacie drive I want to hook up through firewire since this box is
> only USB 1.0. The only available slot I have is the third from the bottom.
> It fits fine and reads the drive, but my computer has been acting up ever
> since adding it yesterday. Most of the time it happens when accessing our
> network. This has happened before almost a year ago when the internal
> ethernet card died and we had to install a new one. We had it in that slot
> and were getting these problems, so we took out the firewire card from
> another slot and put the ethernet card there and it was fixed. We left the
> offending slot empty since I didn't need the firewire card then. I thought
> it might be the card & the slot didn't mesh well, but this is now 2 cards
> that don't mesh with this slot. I have changed the IRQ settings to every
> option and still no luck. Am I not supposed to use that slot, or maybe it is
> corrupt? I'm not much of a tech guy, but I thought if anyone has any insight
> into this, it would be a big help.
>
> If I missed anything info that is relevant let me know and I can try to give
> you more.
>
> Thanks everyone.
> Ryan
>
>
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Benoit Melancon
Avid DS ACI/ACSR

www.nadcentre.com
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