Date: Tue, 16 Sep 1997 10:05:15 +0200 From: Michael Beckmann <beckmann@nacamar.net> To: Doug Russell <drussell@saturn-tech.com>, William Maddox <maddox@p-1.Eng.Sun.COM> Cc: hardware@FreeBSD.ORG Subject: Re: Parity trouble with Asus mainboard Message-ID: <3.0.3.32.19970916100515.01432790@mail.nacamar.de> In-Reply-To: <Pine.BSF.3.95.970915124530.1820C-100000@hobbes.saturn-tech .com> References: <Pine.GSO.3.96.970915104918.6541A-100000@p-1>
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At 12:47 15.09.97 -0600, Doug Russell wrote: > >> 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. My Gigabyte 586 HX has three settings for parity: enabled, disabled and auto. I set it to enabled when I tried the parity SIMMs. Later I installed the normal SIMMs again and immediately got a parity error, so the parity check seems to work. Michael
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