Not really of help, but this sure is a nice motherboard!
With all these jumpers you may look it there's a board with more or less the same jumper layout and take good measurement
A good sample of another jumper paradise!

like this board a lot !!!

I would say: Shuttle, Biostar, or dataexpert... but my guts say shuttle.

With these old motherboards, I find it pretty weird that it was not completely uncommon that there was zero manufacturer information printed on the silk screens. Sure, many boards were sold with different brand names and that might explain a lot and perhaps there was a sticker at one point in the lowest ISA slot etc, but it is still baffling that some boards pretty much have zero serial codes or other relevant information, not to mention the name of the manufacturer.

OP could check the BIOS string, that at least should tell you the manufacturer.

Hello again, yes, the idea of ​​reading the EPROM is excellent, and I asked a colleague to lend me a reader.
I've made a backup, so I'm uploading it to the post.
Examining the BIOS, it appears to be an NCR SDMS (TM) V3.0 PCI SCSI BIOS, PCI Rev. 2.0 NCRPCI-3.06.00 motherboard.

Thanks for your help.

Although the POST string is
02/07/95-UMC-881/886A-2A4X5R21-00
I'm very confused.

roceco wrote on Today, 20:38:

Examining the BIOS, it appears to be an NCR SDMS (TM) V3.0 PCI SCSI BIOS, PCI Rev. 2.0 NCRPCI-3.06.00 motherboard.

using the TRW bios romcheck tool...

1TRW BIOS analyze (!b):
2__________________________________________________________
3File:     M27C1001DIP32.BIN
4Vendor:   Award
5Version:  v4.50G
6String:   02/07/95-UMC-881/886A-2A4X5R21-00
7Sign-on:  
8Metadata: [ID] Award Modular BIOS v4.50G
9          [SCSI] NCR 3.0
10ROMs: [1000:0003] Broadcom/LSI 53c825

The image contains a normal award bios and also a SCSI bios.

Motherboard manufacturer Rectron ???
BIOS - 2A4X5R21
That manufacturer doesn't ring a bell at all.

Well, the rom isn't listed on TRW. I guess your board isn't either. Feel free to make a submission on the discord. 😀

roceco wrote on Today, 20:38:

Examining the BIOS, it appears to be an NCR SDMS (TM) V3.0 PCI SCSI BIOS, PCI Rev. 2.0 NCRPCI-3.06.00 motherboard.

It's probably from a POS machine or an ATM? That doesn't help you identify the specific motherboard model though...but might explain why not documented well.

No SCSI on board by the way, depsite what the BIOS says

An similar verison was used in a military laptop? https://forum.vcfed.org/index.php?threads/ncr … y-laptop.61236/

NeilKnows wrote on Today, 21:05:

No SCSI on board by the way, depsite what the BIOS says

That BIOS is for add-in SCSI cards with NCR chipset such as the ASUS PCI-SC200 that don't have their own BIOS, many early Pentium motherboards also had this feature.

NeilKnows wrote on Today, 21:05:

It's probably from a POS machine or an ATM? That doesn't help you identify the specific motherboard model though...but might ex […]
Show full quote

roceco wrote on Today, 20:38:

Examining the BIOS, it appears to be an NCR SDMS (TM) V3.0 PCI SCSI BIOS, PCI Rev. 2.0 NCRPCI-3.06.00 motherboard.

It's probably from a POS machine or an ATM? That doesn't help you identify the specific motherboard model though...but might explain why not documented well.

No SCSI on board by the way, depsite what the BIOS says

An similar verison was used in a military laptop? https://forum.vcfed.org/index.php?threads/ncr … y-laptop.61236/

The SCSI rom part of this mainboard is just that a scsi bios for when a scsi card with a specific ncr chip 53c825 which doesn't have a scsi bios on the scsi card itself is present in the machine to allow booting from scsi.