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From: michaelv@MindBender.HeadCandy.com (Michael L. VanLoon)
Newsgroups: comp.os.386bsd.questions
Subject: Re: AMD DX2/80 w/ NetBSD?
Date: 21 Dec 1994 22:18:13 GMT
Organization: HeadCandy Associates... Sweets for the lobes.
Lines: 27
Message-ID: <MICHAELV.94Dec21161813@MindBender.HeadCandy.com>
References: <3d71n3$2hp@solaris.cc.vt.edu>
<MICHAELV.94Dec20142450@MindBender.HeadCandy.com>
<3da3m5$6bb@news.cloud9.net>
NNTP-Posting-Host: mindbender.headcandy.iastate.edu
In-reply-to: tls@cloud9.net's message of 21 Dec 1994 20:37:25 GMT
In article <3da3m5$6bb@news.cloud9.net> tls@cloud9.net (Thor Lancelot Simon) writes:
If you find a 486 PCI motherboard that can clock the CPU at 40MHz,
let me know.
I was on the verge of buying one of those great ASUS motherboards
with built-in NCR SCSI, when I found out that they couldn't handle
a CPU clock higher than 33MHz; haven't found any other 486 PCI
motherboards that can, though I haven't been looking too hard.
One problem is that the PCI spec specifically states that the
supported speeds for the PCI bus are 25MHz to 33MHz. The PCI bus will
not run at 40MHz. So, you would have to uncouple the CPU clock from
the PCI bus clock. I don't see any real problem with doing this
(after all, the PCI bus was designed to be uncoupled from the CPU),
but in the interest of cost, it appears that nobody had designed a
motherboard this way. As long as the motherboard designer keeps the
bus and CPU clocks coupled, you won't be able to go over 33MHz with
PCI.
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Michael L. VanLoon michaelv@HeadCandy.com michaelv@iastate.edu
Free your mind and your machine -- NetBSD free un*x for PC/Mac/Amiga/etc.
Working NetBSD ports: 386+PC, Mac, Amiga, HP300, Sun3, Sun4c, PC532
In progress: DEC pmax (MIPS R2k/3k), VAX, Sun4m
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