the ext bat pin header with a jumper on pin 2-3, remove the jumper, and attach the battery to pin 1 and 4.
measure with a multimeter to figure out which pin is ground and connect that to the negative of the battery, connect the other pin to the positive of the battery.

Shuttle HOT-317P
http://www.win3x.org/uh19/motherboard/show/4427

weedeewee wrote on 2021-04-18, 11:15:

the ext bat pin header with a jumper on pin 2-3, remove the jumper, and attach the battery to pin 1 and 4.
measure with a multimeter to figure out which pin is ground and connect that to the negative of the battery, connect the other pin to the positive of the battery.

Unlucky I do not have a battery pack, I will probably need to modify it to hold the cr2032 battery and a diode.

Deksor wrote on 2021-04-18, 11:28:

Shuttle HOT-317P
http://www.win3x.org/uh19/motherboard/show/4427

Thank you, thank you!

I'm sorry for the bump, apparently the motherboard goes nuts when I install an fpu.
The system hangs on first boot screen or it is unstable, with a Cyrix fasthmath 40 mhz I can boot at 33 mhz but I got this errors and then the system crash:

I tried to restore the bios settings without any help. Unlucky the bios is soldered so I can't flash mr-bios. I'm sure it's not a fpu issue since I tried 3 of them without any better result. Could it be a problem that the system just has 640kb memory?
With other 2 fpu the debug card shows it hangs during the code 9c which is detecting the FPU

Any suggestion?

I just received another FPU, the mb still hangs during the FPU detection, any help please?

Does the board as a jumper to FPU on ? is the bios options correct ? is the fpu same speed of cpu ?

They are rated for the same speed of the cpu, there is no jumper allowing to enable or disable the fpu and there are no bios options for the fpu.