Win3x.Org

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.

Manufacturer name:
Sigma Computer Corp (by AMI BIOS string)

Motherboard name:
Unfortunately no idea at this point.

Motherboard schema:
Baby AT

Supported memory:
8 x SIMM 30

Supported CPUs:
386DX 40MHz
387 40MHz

Motherboard BIOS(es): (manufacturer name, POST string and version)
AMI
40-0100-001176-00101111-111192-CONTAQ-F

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.)

Well, that iPad photo upload apparently didn't work. Sorry about that. Here come the proper images.

from the chipset database:

Citation :

**82C596/A 3/486 Writeback Cache [no datasheet] <11/11/92
Possibly two variant, or one version with two names, one being a
shorthand:
82C596
82C596A

ftp://ami.com/archive/Other_Manuals/!index.txt
lists the A variant with the date 11/11/92. No date for non-A:
"
CTQ596.Z06 88900 12-21-92 3/486 Contaq 596 chipset 06-06 core
CTQ596A.Z11 95383 10-07-93 3/486 Contaq 596-A for 11/11/92
CTQ596_3.Z06 92195 03-01-93 386 Contaq 596
CTQ596_3.Z11 98031 06-21-93 386 Contaq 596
CTQ596_4.Z06 92236 03-01-93 486 Contaq 596
CTQ596_4.Z11 97602 06-21-93 486 Contaq 596
CT596A.Z08 96217 12-09-93 Contaq 596a
"
Note, the column of dates is the file date.

So, your board is the first to have the non-A version of this chipset and also the first proof of the non-A version existing in the first place.

As for sticking a name/model on this board, that is going to be a challenge. There is no telling if Sigma Computer Corporation made it long enough to ever have a website. I'll have a go but simply cannot promise anything at this point.

thank you for the photos.

added with generic description
http://www.win3x.org/uh19/motherboard/show/8489

looking forward to its bios.

The postal address they used is indeed in the right area with buildings of Biostar and Chaintech in the same street. Unfortunately, that is all the information I can find so far...

Finally got around to reading the BIOS.

http://westarps.de/temp/PpmUy2sbApBdRG2 ... -DIP28.BIN

Cheers,
Jens

Friendly reminder to please not forget to add the BIOS as I only put it on my webspace temporarily. Thanks!

I've added the BIOS to the board page on uh19, thanks!