Desktop

If you can find one, just use an old 2MB S3 video card.

Several will work with default NT drivers. You can always go to the video card properties and then start to go through the change process and see the list of these cards. Most generic trident cards will work and be found fairly easy by NT.

Like was said in earlier responses, anything older by S3 or Trident should do great. My suggestion would be S3 Trio64 cards. They are usually of the 2MB variety and do a decent job at 800x600 and 16bit (65k color) video. THose are the ones I would usually put into servers when I built them for any operating system was needed by the customer since the chipset was solid, everyone had drivers, and those drivers were usually pretty stable. Then again, other's mileage may vary )
Cliff

I beleive we have a Diamond Stealth 2001 series card. It uses the S3 chipset.

The one that alway work for me is ATI xpert 98 with 8 mb ram AGP. Need to have at least sp3 and there is a driver on ATI web site that you can download and install.

Good luck.