Had a look on th99, but I'm sure you already checked.

One jumper is always for IRQ2 enable or disable. There might be one for putting the card into 8 bit more. Or one for Wait State or Turbo. Mine has DIP switches to set refresh rates also.

I can only guess, but the jumper at the bottom near the ISA is likely the IRQ jumper. It's usually always closed.

I could not find anything specific , I guess I'll have to do some testing 😀
Thanks for the help Phil

Yea some of these cards are not documented. What I do is do my research before buying 😁

Also note the many jumpers that don't have headers! Who knows what things you could change.

That's why I like the Diamond Speedstar 24x so much. It's well documented.