Thanks.
Reboot on install CD. Start with "tinycoe xsetup" and pick 800*600*24. When booted open a termsess, sudo su, and edit /etc/sysconfig/Xserver. Change the first line to xvesa=800*600*24 and save. Shutdown with backup.
I did it this way because I do not yet know how to backup from the command line. I looked for an obvious backup command but no can find. If I could the I could have edited the file directly and done a backup before rebooting.
At least I only had a starter system so it didn't matter if I started again.