I am sorry, this is not an EISA board.
This slot looks like an EISA slot, but it seems to be a kind of local bus slot.

DO NOT TRY ANY EISA CARD IN THAT SLOT.
Funny fact: It has printed "EISA" near that slot, but it is not EISA at all!

It seems to be an incarnation of OPTi or Orchid local bus which used the same connector than EISA does.
An EISA board typically should have 4 or more slots looking like this.

Perhaps you can try a BIOS from this thread:
486DLC cache coherency blues and headaches

The description next to the connector says that it's EISA, but maybe it's a Opti Local Bus - it's not a problem for me.
Problem is, that the BIOS chip is empty and i need a valid BIOS dump to revive it 😀

Agree do not try that EISA slot. I would try BIOS from this one: https://theretroweb.com/motherboards/s/cachin … 3486u#downloads
Same brand and same exact chipset including the ICS cmos/clock/timer chip, has MOST of the exact same jumpers.

Thanks for advice. I did it and mobo is working 😀

raist wrote on 2023-06-25, 17:39:

Thanks for advice. I did it and mobo is working 😀

That is great !

raist wrote on 2023-06-25, 17:39:

Thanks for advice. I did it and mobo is working 😀

Fine.
Now I recommend you to find out what slot it is.
EISA vs OPTi Local Bus cards - how to tell
OPTi Local Bus variants

There are only a handful of EISA chipsets for 486 class systems. Unless your board has one, then that slot is guaranteed to not be EISA (despite what the silkscreen claims).