Joerg Wallmersperger (joerg++at++zaphod.munich.sgi.com)
Fri, 26 Sep 1997 11:38:33 +0200
are you aware, that you need a special cable for genlocking Onyx2
systems?
There is a special 13W3 cable, which has 2 separate BNC cable outputs for
HSYNC and VSYNC. Put the white cable (I think) into the genlock-in of the
other pipe and put the 75 Ohm terminator on Genlock Loop Through. Genlock
Loop Through is the bottommost BNC connector, Genlock In is the one above
- just in case there is no label :-)
I attached a dg5 gif picture. As you can see, there are no seperate SYNC
outputs like Onyx IR systems used to have.
I think this cable is shipped with all Multipipe Onyx2 configurations. In
case you don't have it, the SGI Partnumber is 018-0634-001. I also
attached a picture of this one.
As stated below, the ircombine issues seem to be correct.
Greetings
Joerg
On Sep 25, 11:08pm, Performer Mailing List wrote:
} Subject: Help - IR Genlock problems!!
} I have a 2-pipe Onyx2 and am trying to use the VR4 HMD in stereo mode.
} I have tried all the previous suggestions on IR genlocks. The format I
} need is 640x486_30i. I set both my pipes to the same format. Pipe 1
} has EXTERNAL sync. I am using the green of the RGB output from one of
} the channels of pipe 0 as the sync being sent to the Genlock in of pipe
} 1. Pipe 1 genlock "loop-through" is terminated.
}
} gfxinfo tells me that pipe 0 genlock is false and pipe 1 genlock is
} true. However, my Performer application still complains that the pipes
} are not genlocked.
}
} My left and right views are not in sync (I am assuming this is because
} of Genlocking problems!)
}
} Help!!
}
} Jay
}
}
}
}
}
}
}
}
} Javier Castellar wrote:
} >
} > > I am using pipes 0 and 1 at 2++at++1280x1024_60 and pipe 2 at
8++at++640x480_60, but I
} > > have no better luck when all pipes are at 1280x1024++at++60.
} > >
} > > Pipe 0's vertical sync is cabled to Pipe 1's genlock in. Pipe 1's
gelock out
} > > is cabled to Pipe 2's genlock in. Pipe 2's genlock out is
terminated. A
} > > scope shows that Pipe 2's genlock out is getting a 60Hz pulse, as
expected,
} > > i.e., no obvious signal problem through the pipes.
} > >
} > > Using ircombine, pipe 0's sync is set INTERNAL; pipe 1 and 2's
syncs are set
} > > EXTERNAL.
} >
} > You have to provide as well the external sync format.
} > In the "Edit Globals" window, under the sync type (INTERNAL in first
pipe and
} > EXTERNAL in second and third) you have to type 1280x1024_60.vfo.
} >
} > sync: EXTERNAL
} > sync format: <the format to sync>.vfo
} >
} > The iR DG4 has the ability to genlock with nearly any signal, as soon
as you
} > said so.
} >
} > In order to check if it is genlocked please use:
} >
} > /usr/gfx/gfxinfo -v | grep Sync
} >
} > I will be in IITSEC during next week, if is more urgent try to
contact my
} > admin.
} >
} > It know that it works, I have personally genlocked our 3 pipe iR, a 3
pipe
} > Onyx2 and nice 4 pipe Onyx2.
} >
} > Try to genlock first couple by couple (i.e. 0->1 ) to be sure the
cables are
} > right, one by one. It will reduce the number of variables.
} >
} > Remember to terminate the last genlock out.
} >
} > -Javier
} >
} > --
} >
*************************************************************************
} > * Javier Castellar Arribas * Email:
javier++at++asd.sgi.com *
} > * * Vmail:
3-1589 *
} > * Member of Technical Staff * Phone: 415-933-1589 / 2108
(lab) *
} > * Core Design - Applied Engineering * Fax:
415-964-8671 *
} > * Advanced Systems Division * MailStop:
8L-800 *
} >
*************************************************************************
} > * Silicon Graphics Inc.
*
} > * 2011 N. Shoreline Boulevard,
*
} > * Mountain View, California 94043-1386, USA
*
} >
*************************************************************************
} > "Violence is the last refuge of the incompetent"
} > Hardin Seldon
} >
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}-- End of excerpt from Performer Mailing List
-- Joerg Wallmersperger, System Engineer Silicon Graphics GmbH, Am Hochacker 3, 85630 Grasbrunn E-mail: joerg++at++munich.sgi.com Tel.: 089-46108314 (US: 49.89.46108314) Fax.: 089-46107314 (US: 49.89.46107314) http://reality.sgi.com/joerg_munich
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