Hey, a DB13W3 video connector! Someone's got a Sun or SGI box...
That actually *is* VGA, ch. Passive adapters exist.
I know, I have my Indy hooked up to a Dell flatpanel with one.
Interestingly enough, implementations of 13W3 varied from vendor to vendor. Whilst the configuration of the coaxial RGB pins was constant, the small pins in the centre that dealt with synch, monitor info, GND etc. are different. This means of course that a monitor from Vendor A will expect it's synch info on pin x, but Vendor B's implementation might cause x to be NC, or have monitor info sent over it, causing the monitor to **** itself.
The adapter I have is a Sun one, but in order to use it with the SGI 13W3 connector, I had to pull all the small pins out of one end of a 13W3 cable, connect one end to the Indy, and the other to the adapter. In the absence of any info on the synch line, good VGA monitors will synch off green.
What I never figured out is why all those companies bothered. Maybe really old monitors benefited from a sharper signal over the coax RGB pins? Or more likely they didn't want people using standard monitors with their $10,000+ machines. Either way, it probably is one of the coolest looking connectors of all time.