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Subject: Re: hard drive activity indicator
From: Justin (jaf60_at_it.canterbury.ac.nz)
Date: 2002-05-08


> 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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