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( fixed ) Help troubleshoot 486 motherboard

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First post, by Intel486dx33

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I am trying to get this motherboard to post.
The diagnostic card reads “13 12” and it beeps 3 times and then repeats beeping 3 times.
American Megatrends bios 486dx ISA 1992

Atrend 4GPV3 486 VESA Motherboard
http://www.elhvb.com/webhq/models/486vlb2/4gpv3.html
( A.K.A. VLB Galaxy 486V1 and MB-486-CONTAQ 012093 U4L2-0 )
( A.K.A. - Mecer B860 )
- BIOS ID string X0-0100-001117-00101111-060692-CTQ596-F
- 8-30 pin SIMM slots (1-128meg FPM DRAM)
- 2-32bit VESA Local Bus slots
- 8-16bit ISA slots
- 64-256k cache support in 8-28pin sockets + 1 TAG RAM sockets
- AMI/Award/MR Bios , 486dx ISA , 1992
- CONTAQ (German) 82C596 A Chipset
- Supports the following cpu's at 25/33/40/50/66MHz
INTEL 80486SX/80486DX/80486DX2, P24C, P24T
CYRIX CX486M6, CX486M7
AMD AM486DX/DX2
- Green PC Connector
- Manufactured by: Atrend Technology Co. Ltd. or VisionEx + CTL corp. USA 1993
Actually, This motherboard was branded by several USA companies including: Atrend, Mecer, and VisionEx.

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Last edited by Intel486dx33 on 2021-05-02, 14:57. Edited 1 time in total.

Reply 1 of 4, by majestyk

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Sounds like a memory issue. In most cases you have to populate 4 memory slots with 4 identical RAM sticks starting with Bank 0 (in this case the one closer to the ISA slots).
Is there any documentation stating otherwise for this chipset?

Reply 3 of 4, by Deksor

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Can you please make a clearer photo so I can add it here ? 😁 http://www.win3x.org/uh19/motherboard/show/5678

a BIOS dump would be helpful too (if you can get it to run but I'm sure you will !). Use this to dump it http://cd.textfiles.com/microhaus/mhblackbox3 … MORY/GETROM.ZIP

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

Reply 4 of 4, by Intel486dx33

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majestyk wrote on 2021-05-02, 06:34:

Sounds like a memory issue. In most cases you have to populate 4 memory slots with 4 identical RAM sticks starting with Bank 0 (in this case the one closer to the ISA slots).
Is there any documentation stating otherwise for this chipset?

Yes, That was it. I had to use all slots in bank-0.

Thanks.

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