VBGamer

I'm working on a 3D-Shooter game ,like Quake or Half-Life.It uses D3Dim. I want the game to be compatible with 3Dfx-cards like Voodoo 1 & 2 too. I heard that the DirectDraw enumeration function doesn't enumerate those cards. (I have a common video card (Asus V3400) that has HAL-support,it is a primary Display Driver).Is it true that those 3DFx's are not enumerated as a Secondary Display Driver? Another question:3Dfx cards support TNLHALDevice,or HAL-device too, am I right?