Damn, you're right, that's the pinout for the Indy. I have both an Indy and
an Indigo with a modified ATX power supply.
I can't for the life of me find the page again that had the pinout (the
service manual is not helpful:
http://www.megarat.com/indigo/docs/indigo_service.PDF).
I'll go and check ;)
On Mon, Dec 12, 2016 at 3:27 PM, <ethan at 757.org> wrote:
  http://forums.nekochan.net/viewtopic.php?t=3731 has
the pinouts. Works
  like
 a charm ;)
 
 I found that in my hunt but I think those pinouts are for the
 Indy/Challenge S machines? The Indy had a soft power on button on the
 front, the Indigo has a reset button and speaker mounted to the power
 supply (but the wires from those are just passed directly to the power
 supply connector.)
 Might get a chance to poke at it tonight after work and I'll compare!
 Thanks!
                         - Ethan
 --
 Ethan O'Toole