I have the same motherboard with the same problem.
Also, there are at least two more reports out there about similar mobos and chipset.
All these early, wide format, 386 mobos are slow and clunky.

I think you mean long, not wide. I actually disagree about all of them being slow and clunky. Some of the fastest ones are actually full length baby AT. AMI Mark V Baby Screamer being one. There's also a Chaintech board with SiS Rabbit chipset that's quite speedy. The FU340 is not exactly a slouch either. It benchmarks in DOOM pretty well, and it has impressive memory throughput.

Did you start any threads about your experience with the board?

A little late to the party but I have the same board and will try the MR-BIOS. Will post results here.

I have managed to test one of the MR-BIOSes that were available. My motherboard has 64kB cache installed and it showed fine on BIOS screen (used V051B321 file). I'm attaching memory results from Speedsys too.

I have dumped my original AMI BIOS that came with my motherboad and it's called FU3-V8 PAGE MODE BIOS. I've compared it to other BIOS files that are available on the internet and it seems different. I'm attaching it too, maybe you'll find it useful.

30-0200-D01247-00101111-050591-PEAKDM_B
FU3-V8 PAGE MODE BIOS

D01247 -> 1247 = Abit

if you have a FU3 V1 board, please make a picture for the wiki
https://www.vogonswiki.com/index.php/Abit_FU3_Version_1
FU3 V2 board:
https://www.vogonswiki.com/index.php/Abit_FU3_Version_2

How do I know what version do I have? Still, it probably is V2 as it looks the same as the one on the photo.

This FU3 V1/V2 thing may be different.
See, the "FU3 V1" is apparently a 386SX. I doubt a v2 would jump right to 386DX

This seems to be based on TH99. On TH99 there is a "FU3", but no "V1". Only this https://stason.org/TULARC/pc/motherboards/A/A … ON-386-FU3.html
Meanwhile, there's a version 2 here https://stason.org/TULARC/pc/motherboards/A/A … -FU3-VER-2.html
But then again, there's a Abit FU325/FU333/FU340 : https://stason.org/TULARC/pc/motherboards/A/A … U333-FU340.html
And the "FU3 ver2" and "FU325/FU333/FU340" look identical.
Why is that ?

Well since I worked with TH99/Microhouse Technical Library for over a year now, I noticed that many mistakes were made, and also I recently figured out something new when I wanted to add a 486 mobo I had.

This is the 486 mobo I had, a Gemlight GMB-486SG rev 2.2.

But looking at TH99, there's only a version "6.02" https://stason.org/TULARC/pc/motherboards/G/G … G-VER-6-02.html

Now that's strange, because I haven't seen a motherboard having over SIX revisions and even by looking online I could only find boards with similar rev as mine like this one : https://allegro.pl/oferta/gemlight-gmb-486sg- … -vlb-7835075169

But then, after seeing the manual I figured it out : http://minuszerodegrees.net/manuals/Gemlight/ … tion%206.03.pdf

manual wrote:

GMB-486SG High Performance 486VLB Motherboard User’s Manual For GMB-486sg v2 […]
Show full quote

GMB-486SG
High Performance
486VLB
Motherboard
User’s Manual
For
GMB-486sg v2

Manual Edition 6.03

Now THAT looks close to what's in MTL/TH99 ! But it's the manual's revision, not the motherboard's !
But since they probably used manuals to create Microhouse Technical Library (I doubt they went and retro-engineered nearly 6000 motherboards), they probably made other mistakes of that kind.

TL;DR this "FU3 rev1" thing is probably a non issue and just a manual revision, not a motherboard revision.

Please post a high resolution picture of your FU3 motherboard.

I should really try setting my external cache as 64kb to see if the BIOS will pick it up. I remember Feipoa had issues getting 256kb cache to work on his FU340 with AMI BIOS.

This is the 486 mobo I had, a Gemlight GMB-486SG rev 2.2.

That was used in most of the machines of a client I was working at back then. I think I have all the manual revisions. I may even have noted what manual goes with what board revision.

Here is a photo of the board:

Your board seems basically identical to mine, and has the same B1 stepping chipset.

Perhaps you really need to use lower cache capacity or use only one/both banks for 256kb.

Hi! Maybe i can help you.

Im working on a Chips PEAK/DMmotherboard right now that looks like yours.
I cant get it to boot. I have tried flashing it with AMI bios but then it wont even turn on.
Anyway i have saved my BIOS if you would like to try it out.
Here is a picture of the board and the attached bios:

Paar wrote on 2020-05-31, 18:25:

I have managed to test one of the MR-BIOSes that were available. My motherboard has 64kB cache installed and it showed fine on B […]
Show full quote

I have managed to test one of the MR-BIOSes that were available. My motherboard has 64kB cache installed and it showed fine on BIOS screen (used V051B321 file). I'm attaching memory results from Speedsys too.

I have dumped my original AMI BIOS that came with my motherboad and it's called FU3-V8 PAGE MODE BIOS. I've compared it to other BIOS files that are available on the internet and it seems different. I'm attaching it too, maybe you'll find it useful.

Hi! Is it possible for you to share the MR BIOS V051B321 file? I cant find it anywhere.

Best regards /Rickard

Try this link: Re: How about a MR-BIOS ROM file repository?

Paar wrote on 2020-11-13, 11:36:

Try this link: Re: How about a MR-BIOS ROM file repository?

Its working! and also with Texas Instruments TX486DLC cache activated =) Thanks alot!

Did you confirm the external cache is functional?

Yeah, 64K has never been an issue on this chipset. Try 256K and see if a) it is detected, b) it actually works by increasing benchmark scores.

256kb works fine on my board with AMIBIOS and C&T BIOS. But, it is not detected with MR-BIOS. I can't remember if I tried 64kb setting with MR, but I am pretty sure I did.