Date: Wed, 17 May 1995 18:40:22 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> To: karl@bagpuss.demon.co.uk (Karl Strickland) Cc: freebsd-hardware@FreeBSD.org Subject: Re: bad memory.. Message-ID: <199505180140.SAA13066@gndrsh.aac.dev.com> In-Reply-To: <199505180040.BAA03026@bagpuss.demon.co.uk> from "Karl Strickland" at May 18, 95 01:40:07 am
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> > system: 486/33 isa, aha1542, 16mb > > added another 16mb and it went crazy with programs dumping core, and > kernel traps all over the place. so i suspect the memory is bad (this > machine has run with 20Mb previously, and has bounce buffers configured > etc).. > Try adding 1 wait state to the memory setup in the BIOS if you can. I found that my ECS EISA/VLB board would run on ``fastest'' with 4 4MB-60nS simms, but add 4 more and I had to slow it down to ``faster''. This is the same as adding 1 wait state to main memory cycle times. > On FreeBSD 1.x, the memory test doesnt complain. I remember reading > the BIOS's memory test is crap. What should I use to test memory? FreeBSD is one heck of a memory tester, but it does not point to the location of the failure. You *should* get an NMI for a parity error, but gross memory failure (ie 2 bit or more) is often missed by this type of logic. > (currently the machine has 4x4Mb 30 pin 9-chip simms, giving 16Mb. > the new 16Mb is 4x4Mb 30 pin 3-chip simms. that shouldnt cause > any problems right?) No, that should not cause a problem. Are the memory simms the same speed, and at least 70nS or faster? What motherboard is this? -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Custom computers for FreeBSD
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