Intel changed the pinout of the Tualatin cpu's in such a way that they are not backwards compatible with Coppermine motherboard. You need a special slotket like Upgradeware Slot-T

orPowerleap:
http://www.duhvoodooman.com/powrleap/PLintro.htm
Alternatively you can do the modification yourself:
http://www.geocities.ws/tuacubx/reads/MSMG.htm

The Lin-lin adapter and the Slot-T will allow the system to boot by switching the pinout back to something the mainboard understands. However, the mainboard must be capable of delivering the correct voltage (max 1,475V). If it is unable to do so, it might not boot, or feed the CPU Coppermine voltages (1,75) which is not too healthy for the Tualatin.

That is the huge advantage of the Powerleap active Slot adapter, it has its own VRM and whatever V is given by the mainboard will be correctly adjusted to fit the Tualatin's needs.

Sadly, these Powerleap adapters have become very rare.

flupke11 wrote on 2020-04-30, 12:26:

The Lin-lin adapter and the Slot-T will allow the system to boot by switching the pinout back to something the mainboard understands. However, the mainboard must be capable of delivering the correct voltage (max 1,475V). If it is unable to do so, it might not boot, or feed the CPU Coppermine voltages (1,75) which is not too healthy for the Tualatin.

OP wrote he has a P2B-F with a HIP6019BCB regulator wich is VRM 8.4 compliant and able to deliver 1.3v to 2.05v in 0.05 increments.

This adapter will also work:

You place it over the pins and then weld a couple of solder joints.

The adapter itself is very affordable, the problem is that shipping from Korea is absurdly expensive right now with the current pandemic.