First post, by gedbag
I have recently put together a Pentium 3 retro PC equipped with a Diamond Monster 3D II I got off of eBay. Everything seemed to work as intended but I noticed a banding pattern when running games on the Voodoo 2.
At first I assumed this was an issue with my cheap VGA to HDMI adapter (the same issue is present running the card into an Extron RGB HDMI 300 A), but today upon further inspection it seems like the issue is limited to games running at 640x480. Running at 640x480 introduces some vertical banding with different bands going across the image having differences in brightness. There is also severe flicker going on in the affected areas.
What's odd is that 512x384 and 800x600 look perfect and don't have this issue. The passthrough image from the other card (GeForce4 Ti 4400) is also clean at any resolution (including 640x480). Only when the Voodoo itself is rending does the issue crop up.
Anyone know what this could be? Could the card be defective? Any troubleshooting ideas would be greatly appreciated.