[rescue] SGI Octane, LCD?

Andrew Jones andrew at jones.ec
Mon May 24 14:49:10 CDT 2010

On Sun, May 23, 2010 at 10:44:34AM -0400, Ethan O'Toole wrote:
> I have a dual head capable Octane.
> Anyone ever connect modern LCDs to these? It's been so long since I 
> looked, I'm guessing it's sync on green. I'm also imagining that modern 
> 21" widescreen LCDs aren't ?

Most LCDs with analogue inputs are flexible about what you actually feed
them.  I've had no trouble dumping SoG into most LCDs.  (The one exception
I encountered was an HP LCD that would happily display the image, then 
overlay an error message about sync on the perfect image.)

Any 13W3 adapter will work.  For sync on green, you will want to clip the
H- and V-sync pins out of the VGA cable.  (VGA cables are cheaper than
13W3 adapters, so that's where I make the sacrifice.)  Having no signal
at all on the H- and V- sync pins provokes different behaviour than 
garbage signals.

As someone else mentioned, widescreen resolutions are a real pain in the
butt on SGIs.  Worse, some VPro graphics have hardware bugs that make certain
sync ranges impossible to output.  I would search the nekochan forums for 
details.  If the particular output you want is possible, it's easy to copy
someone else's configuration work.

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