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Date:      Mon, 15 Sep 1997 20:15:19 -0700 (PDT)
From:      "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com>
To:        drussell@saturn-tech.com (Doug Russell)
Cc:        maddox@p-1.Eng.Sun.COM, beckmann@nacamar.net, hardware@FreeBSD.ORG
Subject:   Re: Parity trouble with Asus mainboard
Message-ID:  <199709160315.UAA05832@GndRsh.aac.dev.com>
In-Reply-To: <Pine.BSF.3.95.970915124530.1820C-100000@hobbes.saturn-tech.com> from Doug Russell at "Sep 15, 97 12:47:13 pm"

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> 
> > Are you sure these are true parity SIMMs?  Some cheap SIMMs use "logic
> > parity", which just fakes a parity bit for older MBs that require it.
> > These will not work with ECC, and should be avoided in any case.
> > Also, you describe these SIMMs as 2 x 32, 8 x 32 and so forth.  In
> > standard nomenclature, the "32" is the width of the SIMM, i.e., 32 bits.
> > Parity SIMMs are 2 x 36, etc.
> > 
> > Admittedly, this doesn't explain why the Gigabyte board worked, unless 
> > somehow the ECC was disabled behind your back.
> 
> It is quite possible that the Gigabyte automatically disables ECC if you
> don't actually have parity memory installed as an "idiot-proof" type
> feature.  I honestly don't know for sure, though.
> 
Awards standard BIOS does this, Gigabyte uses Awards BIOS with very few
modifications.


-- 
Rod Grimes                                      rgrimes@gndrsh.aac.dev.com
Accurate Automation, Inc.                   Reliable computers for FreeBSD



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