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Subject: Re: hard drive activity indicator
From: true blast (trueblast_at_yahoo.com)
Date: 2002-05-08


interesting - i have a jukebox player. the only time
the LED turns on for me has been when the battery is
about to die...but that's kind of useless as the
player will stop playing anyway if the batteries don't
have the juice.

--- Justin <jaf60_at_it.canterbury.ac.nz> wrote:
> > hey, really appreciate the work you all are doing
> -
> > very cool indeed!
>
> I second that!
>
> > i have a question. i was thinking of modding my
> > jukebox to change the red LED to be the hard drive
> > activity indicator (tie it to pin 39 of the IDE
> > interface). does this LED serve any useful
> purpose?
> > i have never seen it turn on...this is why i ask.
> > what do you guys think?
>
> You should have seen it turn on (jukebox player or
> recorder?). I have
> the recorder, and the software flashes the light
> when it thinks it's
> busy (which often is when it is busy, but seems kind
> of arbitrary -
> other people on this list no-doubt know more)
> So mine works, and no, it doesn't really seem to
> serve much in the way
> of a useful purpose :)
>
> > or is there any way in software to patch something
> to
> > do this? or is this pin of the IDE interface not
> tied
> > to an I/O port or interrupt on the
> processor/hardware
> > that could be detected from software?
>
> I added an LED to pin 39 of my recorder (
> http://www.geocities.com/safe-community/archos.html
> )
> In the recorder at least, pin 39 is not connected to
> anything - the
> socket pin is just soldered to an isolated tab, so
> there is no way to
> detect its state from software. I guess that doesn't
> necessarily mean
> that the same information as pin 39 carries isn't
> carried elsewhere in
> the IDE connection, but if that were the case, I
> wouldn't know.
>
> Besides which, soldering a wire from the red LED to
> pin 39 is quicker
> and easier than a code solution (well, quicker for a
> one-off unit
> anyway. If you want to change 500,000 units then I'd
> suggest code... :-)

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