Help identify 486 motherboard with Contaq chipset and two sockets \ VOGONS

Help identify 486 motherboard with Contaq chipset and two sockets

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First post, by marvias

Posted on 2016-12-27, 15:07

marvias Offline

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Joined: 2016-12-13, 20:27

Hello, I dug out motherboard with 486DX-33.
It has two sockets (168 and 144 pin), 8x 30pin RAM slots, 6x ISA, 2x 8bit ISA and one ISA on the bottom.
Contaq 82C291 / 82C952 chipset, UMC UM82C206L

Bios String is 40-0010-001149-00101111-121291-CTQ 486-F, AMI bios dated to 12/12/91

Some writings on back are 94V-0 VY-4333-1
I was unable to get manufacturer name from bios string (1149 is not on the wimsbios.com site).

I have it with Dell labeled floppies of DOS 6.22 and WfW3.11, so it might be Dell branded motherboard, but really hard for me to tell.

Mainly I am asking to see if I can put inside DX2-66 or some faster CPU and to set jumpers correctly.

Photos attached

Thanks

Reply 1 of 3, by BloodyCactus

Posted on 2016-12-27, 15:57

BloodyCactus Offline

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Location: Lexington VA

maybe a Microstar model? several hits around for '121291-CTQ' but its all unknown. probably lowest price taiwanese mobo around at the time, company couldnt even silkscreen their mfg name on it.

http://www.kva.kursk.ru/bios1/HTML1/microstar.html

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Reply 2 of 3, by marvias

Posted on 2016-12-27, 22:14

marvias Offline

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Joined: 2016-12-13, 20:27

So I went browsing through similar threads from other users which took me to site arvutimuuseum.ee and found layout there 🤣

http://arvutimuuseum.ee/th99/m/U-Z/32207.htm

Is there possibility that 5V DX2-66 or am5x86 133 on upgrade module will work in there ?

Reply 3 of 3, by Eep386

Posted on 2016-12-28, 06:31

Eep386 Offline

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Joined: 2012-09-14, 05:25
Location: Not far from Sacramento, CA

The DX2-66 should work no sweat. Some very quirky BIOSes may identify it as a 486-33 but it should run at the correct speed.
The Am5x86 on an upgrade module, sure. This is a 5v only board so anything faster than a DX2-66 will require the voltage adapter, or an Intel Overdrive. (The Pentium Overdrive unfortunately won't work as the socket doesn't have the necessary pins.)
BTW nice board you got here. 😀 That smaller socket is for a Weitek 4167 coprocessor, used by a few CAD programs.

Life isn't long enough to re-enable every hidden option in every BIOS on every board... 🙁

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