Those eBay SUN/SGI adapters are SUN adapters.
They will only work with SOG monitors on SGI as I described above
. If you wish to confirm, use a multimeter and compare the pinout to those for your workstation in the owner's manual on techpubs.sgi.com. Pay particular attention to pins 3, 4, 5 if IIRC on the 13W3. You will find they don't line up with the pinout of a standard VGA 15 pin connector.
As mentioned above, this is true in general, but: SGI Indigo2 machines *do* put out Hsync/Vsync as well as RGB/SOG,
so it is possible to connect them to non-SOG monitors without any additional hardware, solely by correct wiring.
I don't know if there were variants in the Indigo2 family, mine all were of the R10k Impact type.
These worked fine on Eizo FlexScan L985EX monitors, which are - AFAIK - not capable to synchronize on green.
I got two working 13W3-to-HDSUB25 cables here and am willing to let go for shipment costs if someone wants one.
edefault, I think you need to read my post carefully above -
we are actually in agreement in principle
. I have for years been trying to clarify and post info here on neckochan on why you don't need SOG monitors with SGIs - every system since the Indigo has put out proper H/V sync somewhere. In fact, I am quite sure that a number of posts about "SOG capable" monitors have been made, solely because the mointor works with an SGI, when the posters are actually using proper SGI 13W3 adapters, routing the H/V sync, and there is no way to tell with those adapters if it is using the SOG signal or not!
The el-cheapo SUN/SGI adapters sold on eBay are
proper SGI adapters, because they do
NOT route the H/V sync for an SGI
, and you will need to have a SOG monitor. They were made for SUNs. I'm not saying the SGI doesn't produce H/V sync, I'm saying those adapters do not route/send the signals to the proper pins on the VGA HD15 connector. Read my post about pins 3,4,5 - those are the SGI sync pins, 4 and 5 are H/V sync. SUN uses different pins, so an adapter
be both a SUN and an SGI adapter simultaneously (I neglect some expensive adapters that have DIP switches to set the pinouts - thanks
for pointing this out!). If your 13W3 routes pins 4 and 5 to pins 13 and 14 on the HD15, you have an SGI adapter. If not, it is probably a SUN or other (IBM, etc.) adapter. Unfortunately SUN adapters are much more common, due to sales volume. It is much harder to find a proper SGI adapter. SUN adapters can be made to work with SOG monitors as described earlier, because you don't need the H/V signals routed and can rely on just the 3 coaxial connections. Or you can break out the soldering iron, as you did, but that's more complicated for a lot of people.