Okay I figured this out. The 3DFX Voodoo 1 doesn't work properly on chipsets after 440 LX (or 440 BX). I tried it on an Intel i820 motherboard with a Pentium III 1 Ghz and it just doesn't get read correctly on the PCI bus. I put the Voodoo 1 in an Intel 440 LX board with a Pentium II 266 and the card works perfectly in EF 2000 v2.0. I believe there is an issue with PCI compliancy here. It appears that the Voodoo 1 does not work with the PCI 2.2 spec. The 440 LX board is the last you can use it reliably on, possibly 440 BX, but I have not tried that one.
-photios
-photios