When you thought everything should be found after 20 years, lol.
Another update to you!
Change list:
1) Added support for Mobile Pentium 4 Prescott CPUs. EIST is enabled so you can use any MSR utility of choice to change the multiplier (CrystalCPUID, CPUMSR, RMClock, etc.)
2) Added tRAS values 9 and 10 to BIOS setup
3) Fixed help message for Advanced memory settings section
4) Set default system date to 01/01/2024
http://valid.x86.fr/6pmnfz
Should work with P4C800-E, P4P800 2.0 and P4P800 SE. Issues are reported with P4C800 (timings are not set). I don't have this board so can't check myself. P4P800 series (-SE too) work with memory in slots 1 and 3 only.
benchBIOS v1.2.zip