What is wrong with my GA-486vs ( Solved ). \ VOGONS

What is wrong with my GA-486vs ( Solved ).

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First post, by Intel486dx33

Posted on 2019-07-16, 21:34

Intel486dx33 Offline

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I am having problems with my Gigabyte GA-486vs motherboard.
http://www.motherboards.org/files/manuals/47/486vs8a.pdf

It has always given me problems with 486dx4 CPU’s.
It works fine with a 486dx-50 5v CPU but not with a 486dx4-100 CPU.
I have been able to get it to work once before with the 486dx4-100 but only for a while
And then it stopped working.

I have the motherboard setup on a test bench with a NEW AT 300watt power supply
And Cirrus Logic 5429 VLB graphics card. And just a keyboard.
Nothing else.

I tried all the possible jumper settings. I can’t get it to post with the 486dx4-100 3.3v
I tried several tested known good 486dx4 CPU’s but none will posts.

What could be wrong ?
Works fine with a 486dx-50 CPU.
Motherboard is functional and working.

Last edited by Intel486dx33 on 2019-07-17, 08:47. Edited 1 time in total.

Reply 1 of 6, by derSammler

Posted on 2019-07-16, 21:37

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Check if the voltage regulator for 3.3v is actually working.

Reply 2 of 6, by amadeus777999

Posted on 2019-07-17, 07:29

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Maybe set the fsb to the lowest possible value(I think it was 25 on this board?) when testing?
I never had any problem with any cpu(DX4/X5 even at 5V for example) at least when it came to having the machine boot up.

Reply 3 of 6, by Intel486dx33

Posted on 2019-07-17, 08:42

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I got it working !
Turns out the jumper settings on the manual and what is silkscreened on the motherboard are not correct.
I will take a picture and upload it later.

Reply 4 of 6, by jarcher1701

Posted on 2024-08-26, 17:07

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Intel486dx33 wrote on 2019-07-17, 08:42:

I got it working !
Turns out the jumper settings on the manual and what is silkscreened on the motherboard are not correct.
I will take a picture and upload it later.

I know you posted this a while ago. I have the same board and issues with 486 DX4 100 (AMD). Do you recall which jumpers were incorrected printed?

Reply 5 of 6, by PC Hoarder Patrol

Posted on 2024-08-26, 17:25

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jarcher1701 wrote on 2024-08-26, 17:07:

Intel486dx33 wrote on 2019-07-17, 08:42:

I got it working !
Turns out the jumper settings on the manual and what is silkscreened on the motherboard are not correct.
I will take a picture and upload it later.

I know you posted this a while ago. I have the same board and issues with 486 DX4 100 (AMD). Do you recall which jumpers were incorrected printed?

Is the revision 8B manual any different... https://theretroweb.com/motherboard/manual/48 … eb923538358.pdf

Reply 6 of 6, by jarcher1701

Posted on 2024-08-26, 18:16

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PC Hoarder Patrol wrote on 2024-08-26, 17:25:

jarcher1701 wrote on 2024-08-26, 17:07:

Intel486dx33 wrote on 2019-07-17, 08:42:

I got it working !
Turns out the jumper settings on the manual and what is silkscreened on the motherboard are not correct.
I will take a picture and upload it later.

I know you posted this a while ago. I have the same board and issues with 486 DX4 100 (AMD). Do you recall which jumpers were incorrected printed?

Is the revision 8B manual any different... https://theretroweb.com/motherboard/manual/48 … eb923538358.pdf

I can't see any difference. I'm not sure what board marking was incorrect for the OP and what board version they had.

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