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Unic 2V 486 Motherboard - Anyone Know About This Board?

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First post, by pierangler

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I discovered this motherboard in a box full of electronics that picked up at a garage sale. I am trying to find out more about it - whether it would be a worthwhile start of a retro pc project. Internet searches didn’t bring up this particular board - a few similar ones only.

Details:
On the back side: Unic 2V-0 9227
Processor installed: IBM 03H8585 486
RAM installed: OKI M511000B -Four I think 4 MB each
Several Symphony chips
AMI ISA 486DX bios

Anyone know anything about this motherboard?

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Reply 1 of 5, by weedeewee

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This seems the closest hit on theretroweb https://theretroweb.com/motherboards/s/unknown-isa-s486b

I wonder if this works

Deksor wrote:

Right to repair is fundamental. You own it, you're allowed to fix it.
How To Ask Questions The Smart Way
Do not ask Why !
https://www.vogonswiki.com/index.php/Serial_port

Reply 2 of 5, by pierangler

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weedeewee wrote on 2024-03-03, 20:11:

This seems the closest hit on theretroweb https://theretroweb.com/motherboards/s/unknown-isa-s486b

I wonder if this works

Deksor wrote:

It was stored in a static proof bag in a cardboard box that fit perfectly (could be the original box). The garage sale that I bought it from was at a former HP programmer that had lots of never used samples that he had collected over the years. There were some prototype items. He worked at HP between 1989 and 2005.

Reply 3 of 5, by weedeewee

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I'm sure the people on theretroweb discord would be very interested in any clear photos you can make of those items, including this mainboard.

Right to repair is fundamental. You own it, you're allowed to fix it.
How To Ask Questions The Smart Way
Do not ask Why !
https://www.vogonswiki.com/index.php/Serial_port

Reply 4 of 5, by jakethompson1

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Nice, I'm guessing it is a 486DX-33?

The main limitation is that it is strictly ISA bus rather than VLB or PCI so it isn't going to be the quintessential 1994 DOS gaming PC, as ISA bus hampers video performance.

Still it could be a fun little DOS 6.22 + Windows 3.1 or Windows for Workgroups 3.11 machine.

That Twinhead chip has the battery encased inside. Having that rather than a NiCd button cell pack likely saved the board from being corroded. DigiKey carries DS12C887A+ which might be pin-compatible as a replacement, or you can look into directions on how to cut it open and wire a new battery on top.

Reply 5 of 5, by Deksor

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weedeewee wrote on 2024-03-03, 21:54:

I'm sure the people on theretroweb discord would be very interested in any clear photos you can make of those items, including this mainboard.

Absolutely,
@op can you please dump the bios of this board, this could help identify it more.

Do you allow me to use your picture on the page @weedeewee linked ? (You will be credited of course)

Trying to identify old hardware ? Visit The retro web - Project's thread The Retro Web project - a stason.org/TH99 alternative

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