ASUS VL/I-486SV2GX4 Rev 2.0 + AMD 5x86 X5-133 \ VOGONS

ASUS VL/I-486SV2GX4 Rev 2.0 + AMD 5x86 X5-133

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First post, by Retronerd878

Posted on 2026-02-12, 17:55

Retronerd878 Offline

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I have an ASUS VL/I-486SV2GX4 Rev. 2.0 that works perfectly with an AMD DX2-66. However, after swapping in an AMD 5x86 133 MHz, the system no longer boots properly.

There are quite a few jumpers on this board, and some of them are confusing. I’ve followed both the official manual and the jumper table available on RetroWeb as closely as possible, but I still can’t get it to work.

The board correctly detects the CPU and displays the proper frequency. It also counts the RAM, but then it hangs. I’ve tried multiple jumper combinations without success. The only change I noticed at one point was that the “Energy” logo disappeared after the RAM count, but it still froze immediately afterward.

I believe this is a fairly common CPU/board combination, so I’m hoping someone might be able to share a photo of their jumper configuration or offer some guidance on what I might be doing wrong.

Any help would be greatly appreciated. Thanks!

Reply 1 of 7, by Retronerd878

Posted on 2026-02-13, 12:40

Retronerd878 Offline

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Anyone? Some guidance would be of great help.
Maybe I need to do some BIOS settings as well? The BIOS is the latest version, the one with the write-back L2 fix

Reply 2 of 7, by Nexxen

Posted on 2026-02-13, 13:06

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Check the FSB with an oscilloscope + Vcore.
Disable L2 cache + play around with bios settings to go as slow as possible with settings.

Edit: maybe isa works at some strange frequency and the cards won't play along.
Try different vcards, controllers...

https://theretroweb.com/motherboards/s/asus-vl-i-486sv2gx4

Last edited by Nexxen on 2026-02-14, 13:32. Edited 1 time in total.

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Reply 3 of 7, by Chkcpu

Posted on 2026-02-14, 10:20

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Hi Retronerd878,

I believe your issue with the Am5x86 on this board is caused by incorrect jumper settings.

Can you list how you have set the CPU configuration jumpers JP16 to JP22, and the hardware trap jumpers JP5 and JP6?
Specifically both JP5 and JP6 need to be set to 1-2 closed for any Intel or AMD L1 cache Write-Back capable CPU. This is indeed not clear from Asus’s documentation.

Cheers, Jan

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Reply 4 of 7, by MikeSG

Posted on 2026-02-14, 13:12

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Does your board have the voltage regulator?

Reply 5 of 7, by Retronerd878

Posted on 2026-02-17, 16:54

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Finally got it to work. Here are some pictures with the jumpers.

However, I'm a bit concerned with the memory speeds. The L2 cache and ram seem a bit slow.
Ram is 2 sticks of 16 MB (32 total) 60 ns. Cache is 256 kb in total 15 ns. In bios I set the most aggressive timings.
Is it normal?

Reply 6 of 7, by Retronerd878

Posted on 2026-02-17, 16:59

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In speedsys I get the AMD 133 Mhz score but the memory speed seem slow to me.

Reply 7 of 7, by Retronerd878

Posted on 2026-02-17, 21:36

Retronerd878 Offline

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I figured it out. It seems that this board has a turbo switch header. The pins need to be shorted, otherwise it runs slower.

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