Some days ago I obtained an Intel SR440BX. 😀 A µATX Slot-1 Mainboard with Riva TNT graphics and an Audio PCI 64V. It has one ISA slot for the usual Retro soundcard goodness. All this makes for a very compact setup.

Coppermine CPUs
In regards to running coppermine Pentium III Processors on this board. With any BIOS newer then Version P06 you will get this message at boot:
"Warning : This motherboard is not compatible with this processor's voltage requirements. The system has been halted." etc.
P10 is the latest BIOS.

BIOS Versions P06 and earlier will run with a coppermine CPU without complaining. Usually it is written that this board cannot give a Core Voltage below 2 Volt, as required by coppermines. But this is unlikely:
P-III 450 /512/100/2.0 V S1 SL35D: I measure 2,06V
P-III 600E/256/100/1.65V S1 SL3H6: I measure 1,70V
P-III QH31ES @3.5x66=233MHz: I measure 1,68/1,69V
I measured at the underside of the board next to where one leg of the large coil is connected.
What is more likely is that the voltage regulators have trouble with high currents at the lower voltages. That and marketing decisions.

BIOS
With most BIOS versions I can just go to Setup with the F2 key, and I can leave that configuration mode jumper alone.
There is not much of interest in the BIOS, just the basics.

Newspeed
So on this board I could test the mysterious intel Newspeed.exe tool.
I tested it with about 5 different P-IIs and P-IIIs. What is common is that every 66MHz FSB Processor was set at 233MHz by default, every 100MHz FSB Processor was set at 350MHz by default. A 100MHz processor that I previously rewired to a 66MHz FSB was also at 233MHz.
So they were all reporting a value that translates to multiplier 3.5x. But this multiplier value was only actually used with the two (partially) unlocked CPU's I have. On the other CPU's this setting is totally ignored.
The (partially) unlocked CPUs could be given values higher then 3.5x, and they would run as such after reboot. Unfortunately the program would not accept any value below 3.5x (233MHz).

FSB speed
The FSB speed is determined with a CPU autodetect, through pin B21. The PLL IC does not even support anything else then 66 and 100MHz. CPU's with a 133MHz default FSB speed will not run on this board. I tried it, but the system does not boot. The SoftFSB software does not support this board.

Some soldering hacks regarding the SR440BX. This probably also goes for the other intel i440BX mainboards. Sources used: datasheets.

Here is how to make a manual FSB speed selection jumper, instead of the auto detect speed selection.
Disconnect ICS9248-20 Pin-25 from the board, and connect it to a jumper block.
Connect Pin-25 to 3,3V for 100MHz (jumpered). Disconnect Pin-25 for 66MHz (open).

Not a bad photo for a 6 year old SE phone. 😀

Edit 1: Something is missing in the above: The 66MHz setting must be jumpered towards Ground, instead of floating. Then it works reliably.
Edit 2: Note that there is no jumper to switch the AGP divider inside the north bridge between 2/3 and 1/1. That one is still on autodetect. I added such a jumper on an Asus P2B v1.04 once, but I don't think I will bother in this case, as 133MHz FSB speed is not an option anyways

Here is how to make a Slot-1 133MHz FSB Speed Pentium III EB work with the SR440BX, although it won't be running at 133MHz FSB.
Remove the resistor R19 on the slot-1 card, because otherwise the mainbaord will ground it through Pin A14. Then connect it to a 3,3V source at R18.

So There I have it my way: Running the SL3XG Pentium III 533 at 266MHz on the SR440BX.

Another LPX board ( manual here: http://ftp4.de.freesbie.org/pub/misc/x86.org/ … bd/28167102.pdf ), 1.8MB photo.

Not mine, but if I decide to buy it I'll give it a proper cleaning and post a better photo.

gerwin wrote:

Here is how to make a Slot-1 133MHz FSB Speed Pentium III EB work with the SR440BX, although it won't be running at 133MHz FSB. […]
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Here is how to make a Slot-1 133MHz FSB Speed Pentium III EB work with the SR440BX, although it won't be running at 133MHz FSB.
Remove the resistor R19 on the slot-1 card, because otherwise the mainbaord will ground it through Pin A14. Then connect it to a 3,3V source at R18.

So There I have it my way: Running the SL3XG Pentium III 533 at 266MHz on the SR440BX.

But why? Didn't the SL3XG already work on 440BX motherboards? I know the multiplier is locked but the FSB should still be selectable from the BIOS or a jumper, right? So shouldn't selecting the 66mhz fsb without the hardware hack give the same result?

cdoublejj wrote:

Anonymous Coward wrote:

I want to know where I can get one of these: […]
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I want to know where I can get one of these:

with matching CPU card:

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😳 holy heck what is that monstrocity? on another not i hate that proprietary BS but, some times it's part of the fun.

Thanks to our friend GL1zdA in Poland, I now have one of these weird boards on the way...though with a dual P60 card rather than the P90 card shown. I'd like to get a hold of the P90 card if possible...I have an evergreen spectra 400 here that wants to see some VLB/EISA action.

sliderider wrote:

But why? Didn't the SL3XG already work on 440BX motherboards? I know the multiplier is locked but the FSB should still be selectable from the BIOS or a jumper, right? So shouldn't selecting the 66mhz fsb without the hardware hack give the same result?

On the 440BX Intel boards I've messed with, they will refuse to boot at all if they detect a 133FSB processor. They won't let you run it at a reduced bus speed, they want you to go back to the store and get a different processor.
On dual boards, they will also actively detect whether you have a terminator installed and refuse to boot if you left an empty socket. Intel wants everything by the book.
I'm curious if they strictly enforce the specs regarding when registered memory is required, I haven't tried trolling them on that.
The thing I love about Intel though is they have the most precise and detailed motherboard manuals I've ever seen. And you have to read them because when they lay down rules, they mean it.

Intel believes in FSB autodetect, they don't want it adjustable. But the board mod described earlier would defeat that.

Exactly, Intel BIOS has no such options, while they are common for most other BX boards.
Normally (without the hardware mods and BIOS P6) The CPU has to be listed as supported and will be configured automatically. In any other case the intel board will refuse to run.

An early Intel iSBC 386AT-25 motherboard (you can add the photo to the first post, although it's watermarked - I doubt the seller will care about it, it's one of these recyclers who trade something they don't know much about):
http://allegro.pl/plyta-intel-z-1985-88-zabyt … 3106256811.html
It's one of the earliest Intel motherboards (there are two older: iSBC 386AT and iSBC 386ATZ). You can find these motherboards in the Intel OEM Boards and Systems Hanbook 1989. It's similar to the Intel System 302 motherboard.

I would be thankful if someone would scan these articles about the above motherboards:
http://trove.nla.gov.au/version/55045705
http://trove.nla.gov.au/version/55060141
http://trove.nla.gov.au/version/55107334 (issue)
http://trove.nla.gov.au/version/55107359
http://trove.nla.gov.au/version/63740692

An Intel 486 EISA motherboard, probably a 403E:
http://allegro.pl/plyta-intel-eisa-serwer-32- … 3430800797.html

Would it be in adea to attach the image of the board to your posts? the sale will expire and then it is lost.

I've made Gl1zda the owner of the first post so he can work on it.

I need to move the photos over to Mediafire sometime. Imagebam is unreliable these days.

That is even better 😀

Imagebam unreliable, sorry to hear that. It was the image hosting of choice for a while.

gerwin wrote:

Imagebam unreliable, sorry to hear that. It was the image hosting of choice for a while.

My images seem to slowly disappear from their servers. Sometimes the thumbnail remains but the original is gone.

Came across another intel microATX motherboard:
MU440EX
CPU: a single Pentium II (<=333MHz) or Celeron processor (<=400MHz)
Chipset: Intel 82440EX AGPset, 66 MHz host bus speed
Slots: 1 ISA, 2 PCI
Audio: Yamaha YMF 740-V
Graphics: ATI Rage Pro Turbo AGP with 2 MB SGRAM (option for 4MB?)

What image hosting service do you recommend? I assume the forum software can't do scaling?
EDIT: now it works.

I discovered that AN430TX AA revisions 672839-xxx does not contain onboard graphics and 680905-xxx does. Is it true?

Not long ago I got myself a PD440FX. YMF715 and no SCSI, only IDE as opposed to the first post
https://dl.dropboxusercontent.com/u/99196890/ … ns/P1020813.JPG

Most of the integrated devices (graphics, sound) were optional - Intel sold what the OEM wanted. I have a naked AN430TX and one with sound.

I also have an AN430TX with onboard Yamaha sound. It feels much snappier than the AT 430HX board with 256K L2 I owned back in 96-98...

17 years later I am finally able to build my dream Socket 7 system... 🤣

"Hendrixx" (??) motherboard. Intel 430 LX (Mercury) with integrated CMD640 and Cirrus Logic CL-GD5434. AA 634444-201
Sister of the Batman and Premiere/PCI LC (Robin LC) AA 622319-402
Seeking for docs and BIOS upgrade.