[CentOS] Driver for Symbios 8100S PCI SCSI?

I'm trying to install CentOS 3 on an OmniBook 800. (Am I insane?) The bootdisk.img gets things started just fine, but the closest driver on the drvblock.img disk is for the Symbios 53C896, and the Omnibook has a 53C810. Manually choosing the Symbios driver seems to discover scd0, but it's not able to load CentOS from the CD. (I've tried both the boot.iso from the os/i386/images directory, and Disk 1 from the regular set of install ISOs.)

Any suggestions? Am I just out of luck? (The last Linux installed on this thing was RedHat 5.2, but that was overwritten with Windows 98 long ago.)