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GUS Programmer's Digest Wed Jul 21 00:07 Volume 2: Issue 25
Today's Topics:
NMI
Standard Info:
- Meta-info about the GUS can be found at the end of the Digest.
- Before you ask a question, please READ THE FAQ.
----------------------------------------------------------------------
Date: Tue, 20 Jul 93 03:36:30 GMT
From: thomasvk@blackhl.hacktic.nl (Thomas van Kuipers)
Subject: NMI
Message-ID: <JFBe8B7w165w@blackhl.hacktic.nl>
I post this here also, because NMI is a very hardware/software/prog.-ware
related problem.
Here the msg:
Hi Phil,
In your letter to the gus digest:
" Date: Thu, 15 Jul 1993 09:40:04 -0500 (CDT)
From: Phil Johnson <hands@seahorse.micro.umn.edu>
Subject: NMI problems
Message-ID: <Pine.3.03.9307150904.A4551-b100000@seahorse.micro.umn.edu>
lacking of the NMI procedure on the SBOS prg.. BUT... my puter (a DX2-66
on a VLFSD [?] v1.0 board, Intel chips) was running a-O.K. with SBOS,
UNTIL.. about a few days ago, it suddenly gave me the NMI error, and I am
really upset!
I did not install a thing, nor did I mess with my motherboard, open the
CPU case, or screw with CMOS.. I powered it on one day and SBOS just
didn't work. ..."
You mentioned how you called a techian and told you that it
never worked in the first place. He must have been referring
to that a problem under dos can be not harmful at one moment
and at another moment be harmful. It's the same with your
interrupt setting who might be conflict full(especially when 2
things are on one interupt, like modems and sound blaster),
but works with dos and then os/2 doesn't works or gives errors.
(a hidden problem thus)
Know Nmi .... I know (also from digest and other sources) that
SBOS tries to get hooked to the NMI (the ONLY NMI interupt in
the computer is IRQ 0 ! which is been used by the memory ...).
Irq0 is used to fresh up the Dynamic RAM. For a reason me not
known, the gravis / Ford programmers find it usefull or so to
hook up SBOS to IRQ 0 (the told the had to use it, because it
HAS to intercept, in all circumstances, the computer to
emulate SB).
I had this a few times in a OS/2 DOS box (The NMI procedure on
this P.C. is disabled.) and so on i assume os/2 get a hold of
that too (it only accured when i ran 2 dos box'en with sbos or
when i closed a dos box with sbos on and then opened it and
tried to run sbos).
It can have to do with your memory manager (qemm, emm, max),
but it works fine by me with qemm and emm or neither. Also i
don't have a dx2 or VLB (you said VLFSD v1.0, but i think you
mean Vesa Local Bus (no you mean VLSI chips ? if so .. VLSI
are large Scale chips with much transitors).
As far as i know the message has nothing to do with cpu/open
computer/or cmos. One thing you could check: Do you have the
I/o bus TO fast, i mean stand it on 8MHZ (some card don't like
to fast i/o card .. i don't think it is the solve, but who
knows).
Sorry for the long letter, but i hope you understand more of
it know. Also sorry for not having a direct answer to the
problem. Best try to get the computer booted with NO drivers
in config.sys/autoexec.bat except RIGHT set parameters.
Thomas
------------------------------
End of GUS Programmer's Digest V2 #25
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