The board bios have "PnP OS " option to enable or disable
Some PCI slots share the same irq and both of cards that are populating those slots must be compatible with this.
This board have 5 ISA and 3 pci right?
Can you give some details of how those cards are populating the motherboard slots? (Which one is PCI or ISA and which slots they are inserted)

i don't find anything about PnP-os in Bios.

Just resources controlled by "setup" or "ICU".
Its now by Setup.

i have one soundcard a soundblaster ISA with IRQ5, irq5 is reserved for ISA in Bios.

PCI slots are from bottom to top:
Miro media view+Tv

Realtek RTL8029 Network card.

VOODOO2

Do you know with pci slots share the same irq?

I tryed the MiroMedia in each pci slot alone. without voodoo2 and netzwork card.

ps: can it be the the ontrack disk manager is causing this problem?

Well i dont really know if dynamic disk overlay can cause this kind of problems because i never had to use it.
About the PCI IRQ sharing i think that is relative to the motherboard itself(it may change for every board)
On older system its normal that PnP means Plug and PRAY 🤣

Had installed Win95 more times today and then i got it to work.

1, Install Win95.
2, Set Driver to StandardVGA (not done yesterday)
3, Install MiroMedia Drivers first (yesterday i installed Network card first)
4, Install Networkcard RTL8029 and Drivers.
5, Install Vodoo2 Card and Drivers.

Network Card and MiroMediaCard still share IRQ 9 but it works now.

Have switched cards around but i am not able to get another IRQ as 9 for any Card.

Did you enable PnP in the BIOS at last ?
This is what (I think) helped me with my IRQ problem for the CT4750. (Although it kinda fixed by itself after like 20 re-installations of Windows 98 🤣)

can only choose

RESOURCES controlled by "setup"
(here i can Reserve some IRQs for ISA Cards)

Or by "ICU"
Then the complete menu with IRQ settings disapear.

Have you tried again with that card ONLY in the mobo ?

Even when the card is the only card installed it get irq9.

But now it works, so i don't care much what the Problem was.

Nice !!! 😁