From: Angus Dorbie (dorbie++at++sgi.com)
Date: 03/23/2000 15:10:40
You need nothing on pipe 0 genlock connector.
Make sure you specify a composite sync on pipe 0.
It may be that you have a problem with your connector, or the DG's
To test the DG's try genlocking some other combination of two pipes.
CHeers,ANgus.
Gary Quinn wrote:
>
> Hi Eric.
>
> Thanks for your reply.
>
> I'm not doing stereo. I am using a 13W3->13W3+2BNC,
> but I've tried both H and V - neither worked.
>
> When pipe zero crashed, it looked like the bitmap was
> confused. Things were being drawn but scan lines were
> mixed in places where they shouldn't have been - I guess
> it could have been either a bitmap problem, or a sync
> type problem. It took out pipe 2 as well as pipe0, but
> 2 just went blank.
>
> It took me about an hour to recover - after several
> failed soft attempts (reboot, reload cmb files, etc).
>
> Oh well.
>
> I think my next attempt - when the machine is free for
> an hour, will be to tee off the green from channel zero
> onto the genlock in on pipe 1.
>
> The sync on pipe 0 is set to internal, pipes 1 and 2 are
> external. I'm using 1280x1024_60.vfo
>
> Do I have to connect anything to the genlock BNCs on pipe zero ?
>
> I'll have a read of your email to Oliver.
>
> Cheers,
> Gary.
>
> Eric Kunze wrote:
> >
> > Hi Gary,
> >
> > You might want to check with the references I just sent Oliver, they may
> > help double check your cabling, etc.
> >
> > If you are running stereo, then you actually need to have the sync output
> > set to horizontal. IR stereo formats have a special csync output on the hsync
> > in order to allow field matched genlock. There were some reasons why it
> > couldn't go on Composite having to do with monitor compatibility. The net
> > result is that for stereo formats, you need to have the sync output set to
> > Horizontal instead of composite for IR. ircombine knows this and will auto
> > select horizontal as your sync output when a stereo format is selected.
> >
> > Also, f you are using one of the SGI 13w3->13w3+2BNC cables that break out H
> > and V sync from an Onyx2, you might want to check the cable. The early models
> > of this cable had the H and V connectors mismarked (H is V and V is H). You
> > can tell if you have this problem by looking at the part number on the cable.
> > If it ends in -001, then it is the old(reversed) cable. The -002 cables have H
> > and V properly marked.
> >
> > Otherwise, make sure your sync setting is external, with sync format
> > correctly set in the "Edit Globals" window of ircombine. Make sure the genlock
> > loop on pipe 1 is terminated, and you should be set. If you are trying to
> > genlock unusual formats, you could try genlocking 1280x1024_60 first to check
> > that your cabling is correct, then move to the other format.
> >
> > > However, I have managed to crash two pipes (and recover)
> > > with the following experiment...
> > >
> > > Setup a very small additional channel with ircombine, on
> > > pipe zero to output sync on green. Then use that sync on
> > > green as the pipe 1 genlock input.
> > >
> > > gfxinfo -v then says that we are genlocked. Pipe zero went
> > > totally screwy when I tried to load a different cmb file - I
> > > had to completely power down the onyx and power up - a reset
> > > and/or reload of any cmb file wasn't enough :-(
> >
> > This is odd. You are only using pipe 0 for output. It should act normally as
> > you change combinations. I can see that pipe 1 might have problems if you
> > changed pipe 0's combination. Are you running the genlock cabling through pipe
> > 0?
> >
> > Eric
> > --
> > Eric Kunze
> > ekunze++at++engr.sgi.com
>
> --
>
> Gary Quinn, VR Centre Technical Manager
> University of Teesside SG Network Admin
> Borough Road, Middlesbrough Go Player
> Cleveland, TS1 3BA mailto:Gary++at++tees.ac.uk
> +44 (0)1642 384303 fax 384310 http://vr.tees.ac.uk
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