I'm trying to install Red Hat 6.1 on an old system (I know its old, but I bought a book and it came with it-wanted to be able to follow along with the book). The specs are :

P166 w/MMX
96 MB RAM
Dell P780 17" CRT
Onboard video (ATI Rage II - ati_m64)
PCI video (SiS 6326 w/ 8MB)

I have Disabled the video in BIOS and Put OS as NON PnP. I'm able to go through Text Install but when it came to detecting the video display, it only gives me the following as default and I cannot choose any other option:
X probe results
Video Card: ATI Mach 64
X Server: Mach64

Once I type "startx", it tells me "No Screens found" at the bottom of a long message. I type "lspci" and it recognizes both ATI M64 AND SiS 6326 display adapters. How can I change this default to the SiS 6326 PCI at install?

I actually ran xf86config in text mode and set my mouse, keyboard, monitor and video configurations. This created a file called xf86config. I chose XF86_SVGA as my server for SiS video card. However, one of the documents I read instructed me to:
1) Setup XF86_SVGA as my default server
2) Copy the XF86Config file to /usr/X11R6/lib/X11

I checked both /usr/X11R6/bin/ and /usr/X11R6/lib/X11 and etc/X11 but I still see the XF86_Mach64 server listed in the directory.

How should I overwrite this with XF86_SVGA and create a symbolic link to X?
Thanks...

Install a newer version of RedHat(9) or install using your onboard video card first, and configure your new card on reboot. XFree didn't play well with multiple video cards in the early days.