I've just finished creating an XVR-100 work-alike from a cheaper ATI branded Mac Radeon card. Not only that, but I can display my console output via DVI.
To do this, you'll need an honest to goodness 32MB ATI branded Mac Radeon 7000. I've tried this experiment with a couple of no-name "powered by ATI" cards without success. You'll also need a PeeCee and a Windows boot disk. Anyone who has philosophical objections to that can stop reading now
(FWIW, I created my boot disk via FC4)
Grab a copy of the Radeon firmware flash utility. I got mine via a link here:
http://www.appletalk.com.au/articles/in ... rticle=352
Next you'll need a copy of the 1.61 firmware for the XVR-100. If you've already got an XVR-100 with this firmware then you're golden. If not then you should be able to get this firmware from Sun. Pending mod approval I can also post a link to a public webserver that offers this patch.
Back up the Mac BIOS. Hey, you might want to go back. Besides, "measure twice, cut once" is a good rule to live by.
Load the Sun firmware using the flash utility.
Drop your new XVR-100 clone into a Sun box and enjoy DVI console goodness. Hey, it beats the 8 color 800x600 I get from the built in Rage chipset on my U5
Edit: If you don't have the 1.61 firmware the reflash should still work. You'll just be missing out on the DVI console output.