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DIY Bios Modding guide Jan Steunebrink k6-2+/3+ 128gb

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Reply 220 of 240, by analog_programmer

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Horun wrote on 2025-04-21, 01:51:

Because FIC made very good motherboards, generally very stable, and back then (early -mid 1990's) they would respond to support emails.

I'll keep my right to (partially) disagree with your statement, just like I (fully) disagree with the popular statement that all of the PC Chips (ECS) products are total cr*p 😉 You know that technical support is much more than just answering to emails and telephone calls. And this very badly implemented BIOS update from 1997 shows only a small part of it - unfortunately a bad one. FIC's technical support may have been good in the early '90s, but that doesn't mean it was still that good from the mid '90s 'til they stopped making computer motherboards by the end of '2000s. So all these general conclusions which brand is good and which is bad are mostly non-sense.

What I (dis)like in this particular 486-GVT-2 board

As I already wrote, I didn't like this particular board at fist sight and my disliking was justified by some facts:
1. There's no built-in VRM for 3.3 V CPU support.
2. The user manual doesn't contain any description for the jumper settings related to AMD 486 CPUs. Does this fall under the tech support fault things? I think so.
3. The coin cell battery is directly soldered to the board and it's of far less used BR(CR)1225 model. Well, at least it's a coin cell lithium battery instead one of those disasterous leaking rechargeable Ni-Cd batteries 😀 So, this board definitely needs a CR1225 battery socket to be installed, as the original battery was depleted a long time ago.
4. This board supports 64 MB of SIMM FP-RAM modules (4 x 16 MB - I wish you a success in finding four 16 MB SIMM RAM modules in the mid 90's, not to mention the price) and only 32 MB of DIMM FP-RAM modules (2 x 16 MB). This is just a ridiculous distribution by types and volumes of supported memory modules. Well, I'm not like that one world-wide famous "philanthropist" to say "32 MB RAM in DIMM modules ought to be enough for anybody" 🤣
5. OTP-ROM chip is used instead of EEPROM or at least UV-erasable EPROM - just like in all the other cheap s.3 boards. If you want to update the BIOS to latest proper version 3.07, you need to buy ind install a new compatible (E)EPROM chip.
6. There's a PAL (or GAL) chip, which can not be read by my XGecu T48. Probably the chip is factory locked.
7. And now "the icing on the cake": this buggy 1997 BIOS "update"... just WOW!

Compared to my s.3 PC Chips M912 ver. 1.4 mobo (an early revision with real cache chips out of the factory) this FIC 486-GVT-2 is... let's say - useless to me.

The only thing that I like in this board is its build quality.

But all this is for another topic, so let's focus on BIOS modifications here.

The word Idiot refers to a person with many ideas, especially stupid and harmful ideas.
This world goes south since everything's run by financiers and economists.
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Reply 221 of 240, by Disruptor

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analog_programmer wrote on 2025-04-21, 03:52:

4. This board supports 64 MB of SIMM FP-RAM modules (4 x 16 MB - I wish you a success in finding four 16 MB SIMM RAM modules in the mid 90's, not to mention the price) and only 32 MB of DIMM FP-RAM modules (2 x 16 MB). This is just a ridiculous distribution by types and volumes of supported memory modules. Well, I'm not like that one world-wide famous "philanthropist" to say "32 MB RAM in DIMM modules ought to be enough for anybody" 🤣

DIMMs on a 486? 😀
You surely mean 16 MB 30 pin SIMMs and instead of DIMMs 72 pin PS/2 SIMMs.

I have some 64 MB and 128 MB 72 pin FPM PS/2 SIMMs.

Reply 222 of 240, by analog_programmer

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Disruptor wrote on 2025-04-21, 12:30:

DIMMs on a 486? 😀
You surely mean 16 MB 30 pin SIMMs and instead of DIMMs 72 pin PS/2 SIMMs.

Yeah, this is my mistake. I mean SIMM modules are 30-pin SIMM modules and mistakenly I've written DIMM modules instead of 72-pin SIMM modules.

Sorry, but two days ago I was honored by the forum's moderating "ai"** as an "edit vandal", and now I have no rights to edit my own posts. So, I'm just leaving it to the forum's moderating "ai" to take care of my mistakes 🤣

** - some stupid "protection" script, which removes the "Edit" button option for the user who fulfills its conditions

The word Idiot refers to a person with many ideas, especially stupid and harmful ideas.
This world goes south since everything's run by financiers and economists.
This isn't voice chat, yet some people overusing online communications talk and hear voices.

Reply 223 of 240, by MarmotaArmy

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Chkcpu wrote on 2025-04-18, 15:43:
Hi MarmotaArmy, […]
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MarmotaArmy wrote on 2025-04-15, 12:57:
Hi Chkcpu , I have a Compaq Camaro motherboard (MVP4) with the compaq bios. It works very well, but it's lacking in options. ¿ […]
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Hi Chkcpu ,
I have a Compaq Camaro motherboard (MVP4) with the compaq bios. It works very well, but it's lacking in options. ¿Is it posible to unlock options such as disable com and lpt ports, disable onboard audio, enable or disable external cache, assign irq to pci devices?
link to retroweb :
https://theretroweb.com/motherboards/s/mitac- … igon-pwa-camaro

I'm not using the Mitac bios because in my tests the compaq is more stable and can achieve better oveclocking results.

Hi MarmotaArmy,

I have no knowledge of the Compaq BIOS and I don’t know how to decompress or decrypt such a BIOS. So I’m unable to see if it has hidden options that can be unlocked.

However the MiTAC Award v6.00PG BIOS for this nice Camaro board has all the bells and whistles to tune the MVP4 chipset. And it has K6-2+/III+ support as well.
I believe you should be able to reach the same stability as with the Compaq BIOS, but you will need to experiment with all these BIOS options. 😉
Start with the Setup Defaults and work from there. The Award BIOS usually uses optimal timings, so you may have to relax the memory timing a notch to reach the same settings that the Compaq BIOS uses, especially when overclocking.

Happy tinkering!
Jan

Thanks Jan, I'll try your advice I want to reassign IRQs mostly.

I'm very happy with this motherboard and pushed to its limits, with 384mb of PC 133 CL2 ram I'm getting 340mb/s of memory read and 30.3 FPS in utbench , using a voodoo 3 2000 (Medium detail , 800x600, sound enabled high quality)

Maybe someday we SS7 fans could start a AMD K6 - Utbench - Aiming for the stars thread.

Reply 224 of 240, by pappyN4

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Hi Jan. I picked up a couple of working socket7's to do a retro build. Based on the release date, I think they would be affected by the UDMA and 32GB bugs.

GA-586TX3 2.1 Aug 14, 1998 Support 32GB capacity below HDD.

P5TX-B V2.0 V2.1 04/28/1997 Support HDDs having capacity over 8.4 GB and partitions over 2 GB

If it's not too much to ask, would it be possible to get them patched with the 128GB(640GB) and UDMA bug fixes?

https://www.elhvb.com/mobokive/Archive/Ecs%20 … /bios/txb21.zip
https://download.gigabyte.com/FileList/BIOS/m … -586tx3_2.1.exe

Thanks

98/XP/XP64, ASUS A8V Deluxe, A64 3200 Venice [67W], 2GB DDR400, Ti4200 128MB [35W], M4 128GB SSD w/SATA-PATA
XP/XP64, GA-F2A68HM-HD2, A8-7600 [45W], 16GB DDR3-2133, Zotac GTX750 1GB passive [55W], 2TB SSD

Reply 225 of 240, by Chkcpu

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Hi pappyN4,

Yes, both these board’s BIOSes are affected by the UDMA and 32GB HDD limit bugs.

The fix for the GA-586TX3 is easy. Flash the Rel 2.2 Award BIOS update from Unicore from https://theretroweb.com/motherboards/s/gigaby … 3-rev-1-0x#bios
This April 2000 BIOS has all these bugs fixed and also supports any socket 7 CPU ever made.

The ECS P5TX-B Rev 2.0 is another matter. I couldn’t find any later BIOS than the V2.1 from 04/25/1997 either. So this one needs to be patched.
I’ve put it on my list, but it may take several months before I can start working on it. I have a lot of other (BIOS) projects to finish first. 😉

Cheers, Jan

CPU Identification utility
The Unofficial K6-2+ / K6-III+ page

Reply 226 of 240, by ChrisK

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Hi Jan,

do you happen to know if there's a similar fix for the GA-586ATX3 as is for the GA-586TX3?
I'm not sure about the exact capabilities of the GA-586ATX3 BIOS v4.0 but dating from 1998 (like the v2.1 for GA-586TX3) I guess it lacks at least some of the goodies, too.
IIRC the ATX3 doesn't work with the BIOSes from the ATX (or ATX2) variant so I wouldn't expect it to work with the v2.2 for the GA-586TX3 either.
Maybe you can shed some light on this if time allows.

Thx

RetroPC: K6-III+/400ATZ @6x83@1.7V / CT-5SIM / 2x 64M SDR / 40G HDD / RIVA TNT / V2 SLI / CT4520
ModernPC: Phenom II 910e @ 3GHz / ALiveDual-eSATA2 / 4x 2GB DDR-II / 512G SSD / 750G HDD / RX470

Reply 227 of 240, by PC Hoarder Patrol

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Chkcpu wrote on 2025-05-14, 07:55:
Hi pappyN4, […]
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Hi pappyN4,

Yes, both these board’s BIOSes are affected by the UDMA and 32GB HDD limit bugs.

The fix for the GA-586TX3 is easy. Flash the Rel 2.2 Award BIOS update from Unicore from https://theretroweb.com/motherboards/s/gigaby … 3-rev-1-0x#bios
This April 2000 BIOS has all these bugs fixed and also supports any socket 7 CPU ever made.

The ECS P5TX-B Rev 2.0 is another matter. I couldn’t find any later BIOS than the V2.1 from 04/25/1997 either. So this one needs to be patched.
I’ve put it on my list, but it may take several months before I can start working on it. I have a lot of other (BIOS) projects to finish first. 😉

Cheers, Jan

May not help, but there's a service BIOS for PCB 2.0 boards from 03/09/1998, though it only mentions fixing SDRAM sizing errors...

The attachment p5txb21h.zip is no longer available

Reply 228 of 240, by Chkcpu

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ChrisK wrote on 2025-05-14, 11:48:
Hi Jan, […]
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Hi Jan,

do you happen to know if there's a similar fix for the GA-586ATX3 as is for the GA-586TX3?
I'm not sure about the exact capabilities of the GA-586ATX3 BIOS v4.0 but dating from 1998 (like the v2.1 for GA-586TX3) I guess it lacks at least some of the goodies, too.
IIRC the ATX3 doesn't work with the BIOSes from the ATX (or ATX2) variant so I wouldn't expect it to work with the v2.2 for the GA-586TX3 either.
Maybe you can shed some light on this if time allows.

Thx

Hi ChrisK,

I don’t know if this has been tried by others, but the Readme in the GA-586TX3 Unicore BIOS indicates that it is for the GA-586ATX3 board as well.

So, if you can test this 586TX3 Unicore BIOS on a 586ATX3, let us know the outcome.

Cheers, Jan

CPU Identification utility
The Unofficial K6-2+ / K6-III+ page

Reply 229 of 240, by Chkcpu

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PC Hoarder Patrol wrote on 2025-05-14, 13:20:
Chkcpu wrote on 2025-05-14, 07:55:
Hi pappyN4, […]
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Hi pappyN4,

Yes, both these board’s BIOSes are affected by the UDMA and 32GB HDD limit bugs.

The fix for the GA-586TX3 is easy. Flash the Rel 2.2 Award BIOS update from Unicore from https://theretroweb.com/motherboards/s/gigaby … 3-rev-1-0x#bios
This April 2000 BIOS has all these bugs fixed and also supports any socket 7 CPU ever made.

The ECS P5TX-B Rev 2.0 is another matter. I couldn’t find any later BIOS than the V2.1 from 04/25/1997 either. So this one needs to be patched.
I’ve put it on my list, but it may take several months before I can start working on it. I have a lot of other (BIOS) projects to finish first. 😉

Cheers, Jan

May not help, but there's a service BIOS for PCB 2.0 boards from 03/09/1998, though it only mentions fixing SDRAM sizing errors...

The attachment p5txb21h.zip is no longer available

Hi PC Hoarder Patrol

Thank you very much for the ECS P5TX-B Ver 2.1h 03/09/1998 service BIOS!

I already took a quick peek in the latest regular P5TX-B v2.1 04/25/1997 BIOS, but it seems not to support drives over 8GB. So the Int13h extensions are missing and there is nothing I can do to get it up to 128GB.
But the 03/09/1998 service BIOS does support drives up to 32GB and can be patched up to 128GB! So your BIOS saved the day. 😊

Cheers, Jan

CPU Identification utility
The Unofficial K6-2+ / K6-III+ page

Reply 230 of 240, by myne

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Is there some pattern that you look for in the data and a relatively repeatable process?

I'm wondering how hard it would be to automate this.
As long as the pattern is the same minus addresses, I think I could knock up a patcher

I built:
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Dos+Windows 3.11+tcp+vbe_svga auto-install iso template
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Reply 231 of 240, by ChrisK

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Chkcpu wrote on 2025-05-14, 18:37:
Hi ChrisK, […]
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ChrisK wrote on 2025-05-14, 11:48:
Hi Jan, […]
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Hi Jan,

do you happen to know if there's a similar fix for the GA-586ATX3 as is for the GA-586TX3?
I'm not sure about the exact capabilities of the GA-586ATX3 BIOS v4.0 but dating from 1998 (like the v2.1 for GA-586TX3) I guess it lacks at least some of the goodies, too.
IIRC the ATX3 doesn't work with the BIOSes from the ATX (or ATX2) variant so I wouldn't expect it to work with the v2.2 for the GA-586TX3 either.
Maybe you can shed some light on this if time allows.

Thx

Hi ChrisK,

I don’t know if this has been tried by others, but the Readme in the GA-586TX3 Unicore BIOS indicates that it is for the GA-586ATX3 board as well.

So, if you can test this 586TX3 Unicore BIOS on a 586ATX3, let us know the outcome.

Cheers, Jan

OMG, you are right!
Should have taken a look into the BIOS zip beforehand, but really didn't expect to be a readme there!
Judging by the POST string I didn't assume they would be compatible (...i430TX-W877-2A59IG0EC-00 to ...i430TX-8661-2A59IG0DC-00).
I will try it on the 586ATX3 as soon as I can and give the result here.

Thanks!

RetroPC: K6-III+/400ATZ @6x83@1.7V / CT-5SIM / 2x 64M SDR / 40G HDD / RIVA TNT / V2 SLI / CT4520
ModernPC: Phenom II 910e @ 3GHz / ALiveDual-eSATA2 / 4x 2GB DDR-II / 512G SSD / 750G HDD / RX470

Reply 232 of 240, by Chkcpu

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ChrisK wrote on 2025-05-15, 13:13:
OMG, you are right! Should have taken a look into the BIOS zip beforehand, but really didn't expect to be a readme there! Judgin […]
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Chkcpu wrote on 2025-05-14, 18:37:
Hi ChrisK, […]
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ChrisK wrote on 2025-05-14, 11:48:
Hi Jan, […]
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Hi Jan,

do you happen to know if there's a similar fix for the GA-586ATX3 as is for the GA-586TX3?
I'm not sure about the exact capabilities of the GA-586ATX3 BIOS v4.0 but dating from 1998 (like the v2.1 for GA-586TX3) I guess it lacks at least some of the goodies, too.
IIRC the ATX3 doesn't work with the BIOSes from the ATX (or ATX2) variant so I wouldn't expect it to work with the v2.2 for the GA-586TX3 either.
Maybe you can shed some light on this if time allows.

Thx

Hi ChrisK,

I don’t know if this has been tried by others, but the Readme in the GA-586TX3 Unicore BIOS indicates that it is for the GA-586ATX3 board as well.

So, if you can test this 586TX3 Unicore BIOS on a 586ATX3, let us know the outcome.

Cheers, Jan

OMG, you are right!
Should have taken a look into the BIOS zip beforehand, but really didn't expect to be a readme there!
Judging by the POST string I didn't assume they would be compatible (...i430TX-W877-2A59IG0EC-00 to ...i430TX-8661-2A59IG0DC-00).
I will try it on the 586ATX3 as soon as I can and give the result here.

Thanks!

Now you are right!
The GA-586ATX3 uses a Winbond Super I/O, while the GA-586TX3 has an ITE, and their BIOSes are indeed not compatible!
The Readme in the Unicore 2A59IG0D BIOS incorrectly assumed an ITE8661 on the GA-586ATX3 as well.

So I looked for the 2A59IG0E Unicore Rel 2.2 BIOS, and here it is:

The attachment 2A59IG0E.zip is no longer available

The ID-string of this BIOS is 04/21/2000-i430TX-W877-2A59IG0EC-00 and its Readme indicates the GA-586ATX3 as only supported motherboard.

I hope this message reaches you in time. 😉

Cheers, Jan

CPU Identification utility
The Unofficial K6-2+ / K6-III+ page

Reply 233 of 240, by ChrisK

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Nothing to worry about, only copied the other (now wrong) BIOS to a CF-card until now 😉
Just had a look at the real board and can confirm the ATX3 indeed having a Winbond Super-IO chip.
There's quite some confusion around about the 586ATX/3 series it seems.
When I got the board it was dead, until reflashed with the right BIOS. Apparently the former owner put the wrong one to the EEPROM and bricked it.
Not to incomprehensible since the board is marked as "GA-586ATX". No 1, no2, no3. (The revision is written far away from the name.) So it's not to difficult to get the wrong BIOS.
I also wrote something about that in one thread here for the guys from theretroweb because their sites for the different revisions also mix some photos. The schemes from microhouse are correct but not so the real board photos. But it seems they haven't fixed that yet...

Long story short: Thank you for the now correct BIOS! Will try it in some free time slot.
Is there much difference between this and the other 128GB-patched F.4 BIOS that can be found on the net (iirc it was from wimsbios)? I meen besides the UDMA bug? Something CPU related maybe?

RetroPC: K6-III+/400ATZ @6x83@1.7V / CT-5SIM / 2x 64M SDR / 40G HDD / RIVA TNT / V2 SLI / CT4520
ModernPC: Phenom II 910e @ 3GHz / ALiveDual-eSATA2 / 4x 2GB DDR-II / 512G SSD / 750G HDD / RX470

Reply 234 of 240, by Chkcpu

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myne wrote on 2025-05-15, 02:32:

Is there some pattern that you look for in the data and a relatively repeatable process?

Hello myne,

Yes, most bugs like the 32GB HDD limit and UDMA bug, can be recognized by a unique bytes pattern. In the episodes of my DIY BIOS Modding guide earlier in this thread, I indicate these offending string of bytes whenever possible.

I'm wondering how hard it would be to automate this.
As long as the pattern is the same minus addresses, I think I could knock up a patcher

I have been toying with this idea myself, but haven’t yet found a solution of how to handle the compressed BIOS.
In recent episodes I explained how to decompress and re-compress these BIOSes manually, but doing that from within a patching tool is a programming challenge I’ve yet to solve.

In apple_rom’s BIOS Patcher tool, he solved this by using external tools like CBROM and LHA to compress his patches. He also avoids patching the main BIOS component (that’s what I do with my manual patching method) by putting the patch code and data in separate modules and patching the BIOS in RAM during each boot-up.
So he only needed to decompress the modules where bugs may be hiding to scan for them.

I know the old UNAWARD tool uses the decompression engine of the BIOS itself, so this may be an option to solve the decompress hurdle. However it would be more elegant and user friendly to let the patching tool do both decompress and compress on its own.

But first I want to complete my BIOS Modding guide and that will keep me busy for the rest of the year. 😉

Cheers, Jan

CPU Identification utility
The Unofficial K6-2+ / K6-III+ page

Reply 235 of 240, by henneberg

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Hi all,

As a newbie, I have read through this nice thread, and I made the Y2K patch the Award 4.50G bios ( https://theretroweb.com/motherboard/bios/awar … 64227867133.zip ) for my U5sx ISA only board.

I am only using DOS with SSD-IDE drive, so basically , only the Y2K patch is needed. I used the Neo hex editor for the modifications ( https://hhdsoftware.com/free-hex-editor ).

Thank a lot for info to do the patch 😀

best regards , Erik

Reply 236 of 240, by Chkcpu

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henneberg wrote on 2025-05-16, 05:25:
Hi all, […]
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Hi all,

As a newbie, I have read through this nice thread, and I made the Y2K patch the Award 4.50G bios ( https://theretroweb.com/motherboard/bios/awar … 64227867133.zip ) for my U5sx ISA only board.

I am only using DOS with SSD-IDE drive, so basically , only the Y2K patch is needed. I used the Neo hex editor for the modifications ( https://hhdsoftware.com/free-hex-editor ).

Thank a lot for info to do the patch 😀

best regards , Erik

Hello Erik,

Thanks for your feedback on my BIOS Modding guide, and nice you could fix the Year 2094 bug.

I’ve looked into this 12/08/94-UMC-498GP-2C4X6S21-00 BIOS and also noticed the 2GB Harddisk size display limit bug at offset 5458h. So you may like to fix that as well while you’re at it. 😉
Your BIOS has the second variation of this bug, as described in Part 3 of my story at Re: Diy modding support for k6+And 120gb hard drives into bios roms

Cheers, Jan

CPU Identification utility
The Unofficial K6-2+ / K6-III+ page

Reply 237 of 240, by Chkcpu

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ChrisK wrote on 2025-05-15, 15:50:

Long story short: Thank you for the now correct BIOS! Will try it in some free time slot.
Is there much difference between this and the other 128GB-patched F.4 BIOS that can be found on the net (iirc it was from wimsbios)? I meen besides the UDMA bug? Something CPU related maybe?

Hi ChrisK,

The 128GB-patched 586ATX3 BIOS from wimsbios only fixes the 32GB and 64GB HDD limit bugs. For the rest, it is identical to the 07/20/98-i430TX-W877-2A59IG0EC-00 Ver. 4.0 BIOS and has therefore no added CPU support or a fix for the UDMA bug.
So the 04/21/2000-i430TX-W877-2A59IG0EC-00 Unicore BIOS is a lot more advanced, and even has full K6-2+/III+ support!

Jan

CPU Identification utility
The Unofficial K6-2+ / K6-III+ page

Reply 238 of 240, by ChrisK

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Hi Jan,

Thanks for clarification!

Chris

RetroPC: K6-III+/400ATZ @6x83@1.7V / CT-5SIM / 2x 64M SDR / 40G HDD / RIVA TNT / V2 SLI / CT4520
ModernPC: Phenom II 910e @ 3GHz / ALiveDual-eSATA2 / 4x 2GB DDR-II / 512G SSD / 750G HDD / RX470

Reply 239 of 240, by henneberg

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Chkcpu wrote on 2025-05-16, 08:49:
Hello Erik, […]
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henneberg wrote on 2025-05-16, 05:25:
Hi all, […]
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Hi all,

As a newbie, I have read through this nice thread, and I made the Y2K patch the Award 4.50G bios ( https://theretroweb.com/motherboard/bios/awar … 64227867133.zip ) for my U5sx ISA only board.

I am only using DOS with SSD-IDE drive, so basically , only the Y2K patch is needed. I used the Neo hex editor for the modifications ( https://hhdsoftware.com/free-hex-editor ).

Thank a lot for info to do the patch 😀

best regards , Erik

Hello Erik,

Thanks for your feedback on my BIOS Modding guide, and nice you could fix the Year 2094 bug.

I’ve looked into this 12/08/94-UMC-498GP-2C4X6S21-00 BIOS and also noticed the 2GB Harddisk size display limit bug at offset 5458h. So you may like to fix that as well while you’re at it. 😉
Your BIOS has the second variation of this bug, as described in Part 3 of my story at Re: Diy modding support for k6+And 120gb hard drives into bios roms

Cheers, Jan

Hi Jan,

Once more, thanx a lot, now the Bios shows the IDE-SSD drive size, that went down from the virtual, wrong calculated 2095 MB to the real 1998 MB.

best regards, Erik