Re: [PATCH] Experimental IDE oops dumper v0.1

From: Vojtech Pavlik (
Date: Mon Sep 16 2002 - 14:55:22 EST

On Mon, Sep 16, 2002 at 05:43:50AM -0400, Rob Landley wrote:
> On Monday 16 September 2002 08:39 am, wrote:
> > Talking about dumping oopsen, would there be any usefulness in outputting
> > crash data to the PC speaker, using a slow, (~300 bps) modulation that
> > would survive being captured on a cassette using a walkman with a
> > microphone, then decoded using a userspace program from a sampled .au file?
> This is easier and less error-prone than copying the oops down by hand?

Works in X. Hand copying doesn't. But serial (or printer) console is
probably easier.

> I remember using 300 bps. On a closed electrical circuit without acoustic
> couplers, you still got line noise. Acoustic couplers put the speaker and
> microphone right on top of each other and surrounded them with a muffler to
> try to minimize ambient noise from the room...

Well, this is simplex only, so it's a bit easier. And we could use even
slower speed, 75 bps would also work.

> > Just thought it might be easily implementable, as it doesn't have any
> > pre-requisits, (other than having a PC speaker, which *almost* everybody
> > has).
> Not everybody has a tape recorder, though.
> And the -ac branch already does output in morse code. Try taping that and
> writing a user mode interpreter for it, if you like...

Vojtech Pavlik
SuSE Labs
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