Apologies if updating this thread ruffles any feathers, but here's a hacked version of that BIOS, which re-enables some hidden features that would otherwise help performance, such as HDD Block Mode, Cache Burst Control and a few others.

I've tested this on my repaired GMB-486UNP v2.2 board, and it seems to work like a charm. After tweaking the formerly-hidden options, the performance is right back to where it was with the AMI BIOS prior to the upgrade. Except now I get early LBA support among a few other niceties. 😁

In this case it doesn't because your post is not of the : me too! can you help me with <totally unrelated issue>?

You actually added useful info. May I ask how you patched/hacked that bios? Did you use rom.by BP patcher or something else?

Eep386 wrote on 2020-08-19, 23:29:

Apologies if updating this thread ruffles any feathers

Eh, can't speak for everyone but my personal (in)tolerance is something like 3-4 years since last reply. A 2019 thread? You're good, dude.

Come on it's not quite dead yet 🤣

I still have to figure out what causes the turbo button to be stuck on slow constantly, but I don't have much time, so it's "on hold" for me. If you have any idea, please share 😉

evasive wrote on 2020-10-29, 08:20:

In this case it doesn't because your post is not of the : me too! can you help me with <totally unrelated issue>?

You actually added useful info. May I ask how you patched/hacked that bios? Did you use rom.by BP patcher or something else?

Hello!

I used AWDHACK with some other tools (MODBIN I think it was). Just re-enabled the hidden options.

Deksor wrote on 2020-10-31, 18:46:

Come on it's not quite dead yet 🤣

I still have to figure out what causes the turbo button to be stuck on slow constantly, but I don't have much time, so it's "on hold" for me. If you have any idea, please share 😉

Not sure what might cause that - something's shorted somewhere.
It may be possible to mod the BIOS so that it ignores the Turbo switch and runs in a fixed speed instead, but I couldn't tell you if that would work or not.

Cool! It would be nice to have an Y2K patch for this BIOS, too. 😁

Eep386 wrote on 2020-08-19, 23:29:

Apologies if updating this thread ruffles any feathers, but here's a hacked version of that BIOS, which re-enables some hidden features that would otherwise help performance, such as HDD Block Mode, Cache Burst Control and a few others.

I've tested this on my repaired GMB-486UNP v2.2 board, and it seems to work like a charm. After tweaking the formerly-hidden options, the performance is right back to where it was with the AMI BIOS prior to the upgrade. Except now I get early LBA support among a few other niceties. 😁

And I just wanted to throw in that I also have one these mainboards (v2.3, though). So if any further measurement is required, just let me know.

Well if you can find out where the turbo button connects to on the chipset, that would help me a lot ^^

Now it may not be a direct connection, but there's no way I can figure that out myself with a broken circuit.

Hey Deksor,

I measured around a bit and I did indeed find a direct connection. Please see attached pictures.
I hope it helps!

NewtoM

Deksor wrote on 2020-11-13, 10:05:

Well if you can find out where the turbo button connects to on the chipset, that would help me a lot ^^

Now it may not be a direct connection, but there's no way I can figure that out myself with a broken circuit.

Ah thanks a lot ! I'll check that chip 😀

Deksor wrote on 2020-11-20, 08:33:

Ah thanks a lot ! I'll check that chip 😀

You're welcome! Please let me know if it works on your revision of the board.

Hi everyone, i have same motherboard. but on my board absent two items, marked as Q5 and CU35, who already has this board may be you could help me and tell me what it is the element?

Hi everyone, I have this exact same motherboard, version 2.2, and the exact same issue. So no post, nothing on screen, nothing comes out the beep speaker. I also checked voltages, and every things seems to be where you expect it. Also the turbo switch pins are connected. There was minimal to no damage from the battery (which is removed). The bios chip is on the board (Award bios), but I read a current on almost every pin, and with my current knowledge I don't know if that is supposed to be like that. The current I read is varying between 2,7 and 5 volts, depending on the pin (ground has no current).

There was 1 give away why this board wasn't working, a trace on the backside of the board, half under the cpu socket, was blown out the board. I fixed that with a wire and all traces have continuity where you expect it.
When I run power through the board the cpu gets warm (currently using an intel DX2 66mhz)

Anyone here still investigating this board and its issues like Deksor described?

I have the same Mobo, but it don't test the ram, power up, shows cpu model and it don't test ram and still in the same status. Any idea? I try a lot of ram modules, same result.

I just bought a simple ISA POST-check card on Amazon. It pointed me to a keyboard error 05.. I replaced the keyboard bios with a known working one and presto, I now have another working VLB board!