[rescue] SOG converter
Jonathan C. Patschke
jp at celestrion.net
Sun Apr 20 11:58:56 CDT 2003
On Sun, 20 Apr 2003, Curtis H. Wilbar Jr. wrote:
> If this is for an SGI, unless I read the pinouts incorrectly, SGI does
> provide a composite sync separately from the sync on green... they
> use a different pin in the 13W3 than Sun does though.
That is correct, which is why all the fools on eBay that claim they have
an "SGI/SUN PC MONTIOR ADAPTAR L@@@K!" are full of it. You can do one
or the other, but not both. Specifically, SGI uses Sun's CSYNC pin to
do some sort of monitor ID. Thus, connecting a monitor expecting CSYNC
there to an SGI can possibly damage the monitor, if it doesn't have
protection against bogus sync signals.
> Maybe not all SGI's provide this signal though ?
My Octane/SI, O2, and Indigo2/SI do. The O2 does PC-style sync as well
> Anyone have any real world experience with this ?
Well, if your monitor is smart enough to interpret SoG, it's probably
smart enough to ignore the CSYNC pin. However, mine isn't. So, when I
connect it to the O2, I get a beautiful screen with the green gun -way-
too warm (because it found sync on CSYNC, and is reading the green pin
at face value). When I connect it to the Octane or Indigo2, it spazzes
out because it's getting a bogus sync signal that it doesn't know how to
I solved this by using a pair of 13w3<->5BNC adapter cables and three BNC
T-connectors in the case of the Octane and Indigo2, and a 13w3<->5BNC
a HD15<->5BNC adapter, and three BNC T-connectors in the case of the O2.
 People on eBay without clue! Say it ain't so!
Jonathan Patschke *) "who has been feeding my cats crack again?? they
Thorndale, TX (* were doing chuck norris shit all over the apartment
*) this morning" --alex j avriette
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