28 Oct
2001
28 Oct
'01
3:34 p.m.
Not having tried it I can't say, but there's clearly a difference in performance
between a 32-bit slot and 64-bit slot. I'd guess the fast I/O devices need all
the transfer bandwidth the 64-bit slot can offer. That would make a 64-bit
board plugged into a 32-bit slot inappropriate if not useless.
Surely somebody is making and selling these things.
Dick
----- Original Message -----
From: "Eric Dittman" <dittman(a)dittman.net>
To: <classiccmp(a)classiccmp.org>
Sent: Sunday, October 28, 2001 8:16 PM
Subject: Re: VLB SCSI?
> > They have been designed from the start to be
forward- and backward-
<snip>
> >
> That wouldn't work too well when you need 99% of the bandwidth. The few
64-bit
> cards I've seen up close don't seem to
have a wide enough slit to allow them
to
> be plugged into a short PCI slot. The standard
references to features such
as
> this one seemed quite iffy. I wish I could
justify a current copy of the
> standard. I just returned one to the local library, which had to get it on
ILL.
If the 64-bit cards won't plug into a 32-bit slot then they aren't PCI. They
may look like PCI, and act like PCI, but if they don't follow the standard
they aren't PCI.
<snip>