correct, the bios chip is missing.

this layout is not known in TRW so that cannot help.

The photo quality is not good enough to see any markings that may identify the board. This is going to be a real challenge.

PC@LIVE wrote on 2025-12-01, 09:40:

ruthan wrote on 2025-12-01, 03:43:

#: 128 I have 1 unknow board to identify- First i need to help to identify it and after i can post a bios (unless of use of some […]
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#: 128
I have 1 unknow board to identify- First i need to help to identify it and after i can post a bios (unless of use of some programmer). With a bit of luck we if we identify it we could be able to find bios online.
Multiple photos so i created own identify thread there are all other labels and text info:
386 mainboard identification help , it has Opti 82C381 + 82C382 chips

Manufacturer/Identifier: Unknown - 386XO cache
Chipset: main Chips used - Opti 82C381+82C382
BIOS/Version: AMI

Well in my opinion, what you think is the BIOS chip (in the photo), it is actually the BIOS chip of the keyboard, the real BIOS chip is not there, it should be between the two square chips, one is a chips.

Agree with PC@LIVE.
BIOS should be in this empty DIL28 socket.