After the 2nd stage of installation was complete, and ROS tried to start up again after the reboot, it tried to load these graphics drivers which I slipstreamed into the install. They crashed and burned with a failed assert checking that the DMA adapter list is not empty.
The drivers are available at S3's legacy driver archive. Series 290-298 drivers. http://www.s3graphics.com/en/drivers/legacy_software_archive.aspx
Attached relevant section of the log with backtrace.