unknown motherboard

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unknown motherboard

Postby Buho » Tue Apr 01, 2014 3:09 am

Hi,

I am cataloging some parts for a museum, but the builder of the motherboard is unknown. I am sorry, I can't put any picture because this is my first post.

Can you help me to identify it?

Thanks.
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Postby Karlsweldt » Tue Apr 01, 2014 6:33 am

Welcome to Motherboards.org.
With no description of the motherboard, it is impossible to name it.
After your fifth posting, you are allowed to post active links.
You could post the link, but split it up with several spaces.
Any Web site is prone to hackers and spammers, so some restrictions are needed to deter those nuisance instances.
Describe its features.. CPU socket type, device card slots, memory slot types. Should be a bit of print on the board as to brand and model somewhere. Main power connection a 20-pin, 24-pin or older 2 x 6-pin?
For older motherboards, these links may help narrow the search.. http://stason.org/TULARC/pc/motherboards/
http://www.motherboard.cz/
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Postby Toby B. » Tue Apr 01, 2014 12:38 pm

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Postby Buho » Wed Apr 02, 2014 2:16 am

Hello,

thanks for your answers.

This motherboard is a AT-486 socket 3.
Builder unknown
CPU Intel 80486 DX2 | 50 Mhz
RAM 4 SIMM 30 centimeters and 2 SIMM 72 centimeters
6 slot ISA 16 bits / 3 VLB
Cache memory 256 KB
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Postby evasive » Wed Apr 02, 2014 5:36 am

What name is on the black square chips? That will give use some idea of the chipset maker and maybe even the chipset model.

Is there anything printed in white ink on the board that is clearly visible?

To give you an idea, even with these specifications (486/3VLB slots)there's roughly 200 different makes/models to choose from. A high-resolution picture or scan would help immensely.

tinypic.com
imgur.com
uploadit.com

are places where you can upload and link to the picture.
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Postby Karlsweldt » Wed Apr 02, 2014 7:40 am

Sounds like a mid to late 1990s model.
Serious question:
If an older Socket 3 design, it may have a BIOS battery soldered near the keyboard socket. Typically red or blue color wrapper. If so, check it for "hairs" or signs of leakage. The electrolyte can etch circuit traces, and render the motherboard useless. But if there is a clip socket for a coin-cell battery, or four pins for an external battery, there is good chance the board might work. 3.6 volts is the normal battery voltage.
For memory, don't mix 30-pin and 72-pin memory modules. Minimal, four 30-pin 1 meg SIMM modules should show signs of life. As to connecting a power supply to it, ensure the black leads from the PSU are next to each other on both plugs! If it does fire up, look in the lower left corner of the video image. There will be a string of letters and numbers. This is a positive ID of the BIOS and motherboard.
But don't expect to run an OS of Windows 98 or later on it. Only a DOS or Linux OS would work decently.
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Postby Buho » Wed Apr 09, 2014 3:47 am

Hello,

the northbridge is a:
Windbond
W83C492F
447ADTAA8055116
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Postby Buho » Wed Apr 09, 2014 3:48 am

the southbridge is a:
Windbond
W83C491F
439AB24230640
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Postby Buho » Wed Apr 09, 2014 3:49 am

the BIOS chip is a:
Award Software Inc.
D2123099
(c) 1984 1995
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Postby Buho » Wed Apr 09, 2014 3:56 am

Image

Image
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