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From: hartnegg@sun1.ruf.uni-freiburg.de (Klaus Hartnegg)
Newsgroups: comp.os.msdos.misc
Subject: Re: Warm or cold boot?
Keywords: reboot, boot
Message-ID: <1991Feb2.095943.14034@sun1.ruf.uni-freiburg.de>
Date: 2 Feb 91 09:59:43 GMT
References: <1991Jan30.194640.10997@pa.dec.com> <20816@hydra.gatech.EDU> <2187@njitgw.njit.edu>
Reply-To: HAKL@ibm.ruf.uni-freiburg.de
Organization: Rechenzentrum der Universitaet Freiburg, Deutschland
Lines: 30

cd5340@mars.njit.edu (Charlap) writes:

>In article <20816@hydra.gatech.EDU> np4@prism.gatech.EDU (POMPONIO,NICHOLAS A) writes:
>>How can a program determine whether the latest boot was warm or cold?
> 
>Well, mine can.  When the mouse driver is loaded, my modem dies completely,
>requiring a hard-reset to fix it.  So, I can just try to communicate with
>the modem.  If it fails, it wasn't a coldboot.  (of course, if I load the
>mouse driver after a coldboot, the modem is still dead...)

A ram disk driver that I have can determine this too.
When it was a cold boot it installs the ram disk. When not
I get a message there is not enough memory available.

I guess that the driver notices that the extended memory is already
in use because it was not cleared by the memory test that runs
at cold-boot. 

Hs perhaps gives us a hint: write something to a memory location
where it does not disturb important things and is not overwritten
by other programs either. What about installing a TSR that searches 
for a copy of itself when being installed and returning an error
code when it finds one. If someone finds an easier solution please
let me know.
-- 
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Klaus Hartnegg, Kleist-Str. 7, D-7835 Teningen, Germany
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