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To: Heikki Suonsivu <hsu@clinet.fi>
cc: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch), freebsd-hackers@freebsd.org
Subject: Re: Web server locks up... but not quite. (?) 
Date: Sun, 18 Feb 1996 22:03:34 PST
From: Brian Smith <brians@mandor.dev.com>
Sender: owner-hackers@freebsd.org
Precedence: bulk

I hope I didn't misquote someone after cutting this down.
Heikki Suonsivu writes:
>J Wunsch <j@uriah.heep.sax.de> writes:
>   Brian, if you got physical access to the box, try placing a simple
>   card into the PC that hooks ISA pins A1/B1 to a pushbutton.  Pushing
>   it will cause an NMI (``IO channel check condition''), hopefully
>   leaving you a coredump.
>
>Anyone with a good source of ready-made cards?

I hate to suggest this, since it is both risky and a dangerous hack,
but if you can get the case off, and have a paper clip, an NMI is just
a moment away.  Bend the paper clip into a wedge shape at the end, then
short the two ISA "pins" closest to the rear end of the PC.

Don't try this at home, then blame me if it fries your motherboard!  I
have done it many a time myself, but I certainly can't guarantee it.  It's
those pesky endless loops after "cli".

Paper clip drawing (don't laugh!):

--------------------\
                     \
		     /
		----/

Except, make it more pointy, so that it fits into the card slot, and
makes good connection.


Slot:

+-------------+ +------------------------------------a+
|             | |                                     |
+-------------+ +------------------------------------b+

Short the last two pins a and b ---------------------^


The other Brian,
Brian

brians@mandor.dev.com