I‘ve been searching for 1-2 hours now and cannot identify this board. The chipset is a single chip Contaq 82C596 which is not even in the database. Only an /A version which seems to be a 486 chipset. Weird.
Sigma Computer Corp (by AMI BIOS string)
Unfortunately no idea at this point.
8 x SIMM 30
Motherboard BIOS(es): (manufacturer name, POST string and version)
I haven‘t dumped the BIOS yet. There is no mention of any version anywhere (sticker, boot screen, etc.)
Any idea what this might be? I will add higher resolution pictures later. (On an iPad right now and the forum doesn‘t allow me to upload the 4MiB originals from the gallery.)