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- Newsgroups: comp.unix.bsd
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!rsg1.er.usgs.gov!ornl!jamsun.ic.ornl.gov!mullens
- From: mullens@jamsun.ic.ornl.gov (James A. Mullens)
- Subject: Re: Some more on NMI problems (some meager advancement)
- Message-ID: <1992Sep8.181528.3876@ornl.gov>
- Sender: usenet@ornl.gov (News poster)
- Organization: Oak Ridge National Laboratory
- References: <1992Sep7.014351.946@ponds.uucp> <cproto.715945053@marsh>
- Date: Tue, 8 Sep 1992 18:15:28 GMT
- Lines: 55
-
- In article <cproto.715945053@marsh>, cproto@marsh.cs.curtin.edu.au (Computer Protocol) writes:
- |> rivers@ponds.uucp (Thomas David Rivers) writes:
- |>
- |>
- |> >Well, I thought I would relay my current status with the NMI
- |> >investigation.
- |>
- |> > Right now, I'm thinking it has something to do with an IDE
- |> > controller/disk drive, so I have been examining the wd.c driver
- |> > trying to divine what it might be; without too much luck. (I
- |> > know very little about the IDE/WD disk controllers.)
- |>
- |> [STUFF DELETED]
- |>
- |> > - Dave Rivers -
- |> > (rivers@ponds.uucp)
- |>
- |> I'm also experiencing the problem. I disagree with the IDE controller
- |> idea. I still think it's a spurious parity error. Note that the NMI
- |> interrupt reports the value of I/O port 61. This value has the highest
- |> bit set which indicates a parity error. But after running QAPLUS for
- |> several days I'm convinced my memory is ok.
- |>
- |> Could it be some sort of setup problem - e.g. wait states which can
- |> be configured in my AMI BIOS.
- |>
- |> BTW I do have a IDE controller/disk so Dave might be right.
-
- Memory parity errors can also be the fault of the system board/bus
- controller. You really need to check for errors while your system
- is "highly loaded" -- lots of I/O going on. A memory tester may not
- be able to see the problem otherwise...
-
- I once had a completely-reproducible NMI which could not be found by
- a tester. It seems that my computer's "bus tended to be unstable
- during periods of high load" and the chips I had purchased did not
- tolerate this very well. I switched chip manufacturers and the computer
- has run w/o problems ever since. This was so long ago that I
- can't recommend the manufacturer, NMBS, on this basis. In fact, I
- visited our PC repair shop and found a notice that, FOR A CERTAIN MODEL
- OF COMPUTER, NMBS and Siemens DRAM "will cause problems". (Assume that
- is someone's theory, not an authority's pronouncement! Don't read too
- much into this since -- it just indicates that not all motherboards
- and DRAM mix well). You might call your computer/system-board manufacturer
- and try to get a recommendation.
-
- I have also read a recommendation that 3-chip and 9-chip SIMMs not be
- mixed together, but I have no real reason to believe this makes a
- difference.
-
- jim mullens
- Internet: jcm@ornl.gov (128.219.128.17)
- mullens@jamsun.ic.ornl.gov (128.219. 64.31)
-
- I speak for myself, not for the organization I work for.
-