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Date: Mon, 29 Jul 2002 17:49:12 +0000
From: Pavel Machek <pavel@suse.cz>
To: Andrew Rodland <arodland@noln.com>
Cc: "David D. Hagood" <wowbagger@sktc.net>, linux-kernel@vger.kernel.org
Subject: Re: Speaker twiddling [was: Re: Panicking in morse code]
Message-ID: <20020729174912.C38@toy.ucw.cz>
References: <20020727000005.54da5431.arodland@noln.com> <200207270526.g6R5Qw942780@saturn.cs.uml.edu> <20020727015703.21f47a37.arodland@noln.com> <3D4298C6.9080103@sktc.net> <20020727114509.0a1eee2a.arodland@noln.com>
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Hi!

> > I don't understand the direction this discussion is taking.
> > 
> > Either you are trying to output the panic information with minimal 
> > hardware, and in a form a human might be able to decode, in which case
> > the Morse option seems to me to be the best, or you are trying to
> > panic in a machine readable format - in which case just dump the data
> > out /dev/ttyS0 and be done with it!
> > 
> > To my way of thinking, the idea of the Morse option is that if an oops
> > 
> > happens when you are not expecting it, and you haven't set up any 
> > equipment to help you, you still have a shot at getting the data.
> 
> 
> To my way of thinking, this is still 'minimal' -- it's just a different
> minimum.
> 
> It's the 'minimum' way to get the panic message out digitally, in such
> a way that I might be able to recover it using a tape recorder or a
> telephone. Actually, morse is probably that, but morse loses data and
> doesn't have any redundancy.

You might even add FSK checksum at each end of morse line ;-), if you realy
want checksum. Plus it will sound cool. You should also play special melody
at each start of repeat, to be more decoder-friendly [and it will also
sound cool].
								Pavel
-- 
Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.

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