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From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: Rev 4.4 motherboard viable?
Keywords: motherboard rev 4.4
Message-ID: <19085@cbmvax.commodore.com>
Date: 18 Feb 91 17:46:30 GMT
References: <1219@xroads.UUCP> <18987@cbmvax.commodore.com> <23199@well.sf.ca.us>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 26

In article <23199@well.sf.ca.us> gmz@well.sf.ca.us (Gerry Zeitlin) writes:
>In article <18987@cbmvax.commodore.com> daveh@cbmvax.commodore.com (Dave Haynie) writes:

>I have a GVP disk controller with a Quantum 40 Mb hard drive on the
>GVP board.  Would this be the configuration that would cause the
>problem?

The old GVP controller didn't do any DMA, so it would not run into the bus
handoff problem I mentioned.  The new one might.  If you're simply having 
problems with things running on the backplane, the first thing you want to
check is the power supply.  If the system isn't running very close to 5VDC
with everything installed, you can expect problems.

>Also, the 68000 chip on my motherboard is not the Motorola chip.  It
>has a large "S" on it.  I have heard that this chip is noisy and ought
>to be replaced with a Motorola chip.  

I don't think that we've ever had any particular problems with the Signetics
68000.  I would not expect that to be a problem.



-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
   {uunet|pyramid|rutgers}!cbmvax!daveh      PLINK: hazy     BIX: hazy
	"What works for me might work for you"	-Jimmy Buffett