DenizOezmen wrote on 2023-10-14, 21:05:
That's odd and doesn't sound like a BIOS issue. The board officially supports Celerons up to 1100 MHz and P3s up to 1000 MHz, so it can't be a general issue with Coppermine processors. Even if the CPU is specified for 133 MHz FSB, running it at 100 MHz FSB should work at the very least.
Maybe someone knowledgeable in hardware debugging has to chime in?
That's what I thought, too! However (spoiler alert) the BIOS you sent helped - see below!
Test results below using 2004001_20230905 BIOS - DIP switches were always set to minimum bus and multiplier (66 * 3.0), cleared CMOS with each new CPU:
* P2-266 - works, as before
* Slot 1 Celeron 366 - nothing, but doesn't work with stock BIOSes now either (tried 2003 and 2004) - maybe I killed this CPU somehow when I ran the P3B-F BIOS earlier, oops
* Coppermine Celeron 600 in jumperless slocket with "1.5V" marking - works, as before, but is now correctly reported as a Celeron rather than a P3, and BIOS no longer alarms about 1.5V VCore - nice
* S370 P3-733 in same jumperless slocket - nothing, as before
* S370 P3-733 in jumpered slocket jumpered to 1.8V (the minimum) - nothing, as before
* Finally, the Slot 1 P3-866 that didn't work before - now works! BIOS reports 1.7V VCore - nice. Seems good so far at 133MHz bus, too.
I'm going to experiment some more with the different slockets and the S370 P3s - I know the whole Coppermine + slocket situation is a mess, but the fact that the board now apparently knows how to do 1.7V (thanks to your BIOS) is promising.
Thanks again! Very cool to have a faster Slot 1 P3 working!