I'm really not sure what your asking here but if you want to hook up the tv using the s-vid out, it should be listed in the driver menu under displays, the tv should be listed there. If I remember right it defaults to 800x600 I think (although I'm not sure). If your plugged directly into a tv then you should see something on the screen at least.

Someone else want to jump in here and add something? I haven't used a Voodoo card with XP so I'm not sure which drivers are the best to use for that one.