Date: Thu, 18 May 1995 02:55:56 +0100 (BST) From: Karl Strickland <karl@bagpuss.demon.co.uk> To: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> Cc: freebsd-hardware@FreeBSD.org Subject: Re: bad memory.. Message-ID: <199505180155.CAA03882@bagpuss.demon.co.uk> In-Reply-To: <199505180140.SAA13066@gndrsh.aac.dev.com> from "Rodney W. Grimes" at May 17, 95 06:40:22 pm
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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.
I'll try this!
> > 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?
all 70ns simms.. ill find out the name of the board, uses the opti
chipset tho..
Thanks!
--
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