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    SubjectRe: Debugging with NMI
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    This used to work on the older systems. Newer systems that use PCI bridge
    circuitry don't let you do this because you form a local ground loop when
    you short the pins, and they've got pull up and pull down logic that will
    shunt the signal (the system sees it as a short and not an NMI) . Even NMI
    cards won't work on most systems newer than about 96 that use the newer
    Intel design.

    Good luck.

    Jeff


    ----- Original Message -----
    From: Bryn Paul Arnold Jones <bpaj@gytha.demon.co.uk>
    To: <borislav@ensim.com>
    Cc: <linux-kernel@vger.rutgers.edu>
    Sent: Tuesday, July 13, 1999 3:27 PM
    Subject: Re: Debugging with NMI


    > -----BEGIN PGP SIGNED MESSAGE-----
    > Hash: SHA1
    >
    > On Tue, 13 Jul 1999 borislav@ensim.com wrote:
    >
    > > In article <fa.e66dv0v.1ch8vqe@ifi.uio.no> you wrote:
    > > > On an ISA bus machine, if you short out the A1 and B1 pins of an ISA
    > > > slot you will generate an NMI to the CPU. This interrupts even a
    > >
    > > I tried this and nothing happened (the machine is still up, no extra
    > > output, cat /proc/interrupts says NMI: 0). I'm sure I used the correct
    > > pins and the right type of paper clip. Any idea what else I might be
    > > doing wrong?
    > >
    >
    > Your problem is a plug'n'play(tm) paperclip, luckily almost all the
    > plug'n'play(tm) material is in the surface of the wire. All you need to
    > do is sandpaper the paperclip to remove the pnp coating and try again.
    >
    > The totally plug'n'play paperclips are easy to spot as after a few seconds
    > of vigorous rubbing, a large ammount of the paperclip will have worn away.
    >
    > Please note any "rough hard surface"(tm) will do, as no manufactures of
    > rough hard surfaces have managed to manufacture a pnp surface coating
    > which is hard wearing enough to withstand the normal wear and tear which
    > rough hard surfaces are subject to, and as we know to make the whole
    > "rough hard surface"(tm) pnp is still too expensive.
    >
    > Bryn
    > - --
    > Or words to that effect ...
    > PGP pubkeys from http://www.gytha.demon.co.uk/pubkey.asc.
    >
    >
    > -----BEGIN PGP SIGNATURE-----
    > Version: PGPfreeware 5.0i for non-commercial use
    > Comment: Silly comment here ...
    > Charset: noconv
    >
    > iQA/AwUBN4uvSt94IUtvfSqaEQIUfgCgh3+JdRUcu63oGdFXkUNz5BE5/mkAn1NT
    > ovddFGPqEiJRFihUGXXnqE3B
    > =v9u5
    > -----END PGP SIGNATURE-----
    >
    >
    > -
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