Hello,
Michael, this is one of the CF card adapters that has a jumper, JP1, that has the Pin-20 power source option as you suggest below. The factory default position is external power (floppy disk power plug), and the alternative position is: "IDE Pin-20." The the settings for the three jumpers are on the jumper's printed circuit board under the CF Card. Sorry I didn't look at the one-sheet instruction sheet that I cannot find right now, but Michael's email reminded me to look under the CF Card.
Tom
--- On Sat, 1/8/11, Michael Tokarev <mjt@xxxxxxxxxx> wrote:
> From: Michael Tokarev <mjt@xxxxxxxxxx>
> Subject: Re: CF Card Adapter White List Candidate
> To: "Robert Hancock" <hancockrwd@xxxxxxxxx>
> Cc: "Tom Denchfield" <td_denchfield@xxxxxxxxx>, "Tejun Heo" <htejun@xxxxxxxxx>, linux-ide@xxxxxxxxxxxxxxx
> Date: Saturday, January 8, 2011, 4:48 AM
> 07.01.2011 07:22, Robert Hancock
> wrote:
> > On Wed, Jan 5, 2011 at 11:33 PM, Tom Denchfield <td_denchfield@xxxxxxxxx>
> wrote:
> >> The reason that I mentioned powering my CF adapter
> with a floppy drive power plug is that the first time I
> booted after inserting the adapter, I forgot to plug the
> floppy drive power plug into the adapter. The
> adapter's power on LED did not light, and I think that
> Ubuntu did not see the CF card.
> >>
> >> The reason that I mentioned the pin that was
> intentionally left out of the motherboard IDE socket was
> that I thought that the missing pin might have had something
> to do with needing to power the adapter with the floppy
> drive power plug given my experience with forgetting to plug
> the floppy power plug into the adapter as mentioned in the
> previous paragraph.
> >>
> >> The pin that is missing from the motherboard IDE
> socket is very close to the middle of the IDE socket.
> My guess is that the pin is in the in the range #18 to
> #24. It is far away from pin #34. I am going by
> memory here, but I clearly remember that the missing pin is
> in the middle. Pin #34 is going into the CF card
> adapter when I insert it. I do not know whether pin
> #34 is grounded at the mainboard.
> >
> > If it's pin 20, that's a key pin that's always missing
> and which has
> > the corresponding hole filled in on the cable side
> (from compliant
> > connectors, anyway), to prevent plugging in the cable
> the wrong way
> > around.
> >
> > Not sure where the adapter would be potentially
> drawing power from on
> > the IDE connector - as far as I know there aren't any
> pins on a
> > standard IDE connector which provide continuous power.
> The adapters
> > I've seen all use an extra power connector.
>
> The 20th pin is actually used on some VIA EPIA (mini-itx)
> motherboards,
> exactly for this purpose: to provide power for CF cards
> like this.
> Some IDE to CF adaptors can be set up (with a jumper) to
> ger power
> to the card from there.
>
> /mjt
>
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