SPiKA85 wrote on 2022-05-25, 16:50:

Hi everyone! I just got an Intel D815EEA2U Mainboard. It works great with a Tualeron 1.2GHz, but when I install a Pentium III-S […]
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Hi everyone!
I just got an Intel D815EEA2U Mainboard.
It works great with a Tualeron 1.2GHz, but when I install a Pentium III-S 1.4 Tualatin. It doesnt boot.
It has BIOS P19.
I tried to find version P21 but I cant find it.
Does anyone here have it?
Thank you very much.
Kind regards.

Quick Google search yielded that you need P21 BIOS.

Stay in touch.

Is this it: https://www.ultimateretro.net/en/motherboards/8309#downloads

acutally the later bios for that board disables the use of the 1.4ghz chips

u need either p13 or p14 or p15. u can get p13 or 15 from this post BIOS P14 for D815EEA2

Official 512KB cache support for PIII-S was added at P14 and removed again, even for your D815EEA2U(niversal) which has both FC-PGA & FC-PGA2 support, sometime after P17. You'll find it and P18 thru P21 at this link - http://cwcyrix.duckdns.org/intel-legacy-files … 0D815EEA2/BIOS/

Full BIOS Histoty

Updated to BIOS P21 and now is working with the Tualatin 1.4GHz with 512KB of L2.
Thanks to you all!

Interesting...I did see a couple of posts which mentioned that that the U models did have support with the latest BIOS, but Intel never seemed to openly publish this, though I've seen NIB D815EEA2U boards which actually shipped with P21 so maybe not that surprising. Glad you got it working anyway 😀

SPiKA85 wrote on 2022-05-27, 05:05:

Updated to BIOS P21 and now is working with the Tualatin 1.4GHz with 512KB of L2.
Thanks to you all!

You're welcome.

Another weird issue I have is that the D815EEA2U is now working with 2x256MB Kingston PC133 CL3 RAM... but if I try to install a single stick of 512MB Kingston KTM0055 PC133 CL2, it doesnt boot.
The CL2 stick works well in a D815EEA2 (non U) board.

SPiKA85 wrote on 2022-05-27, 20:28:

Another weird issue I have is that the D815EEA2U is now working with 2x256MB Kingston PC133 CL3 RAM... but if I try to install a single stick of 512MB Kingston KTM0055 PC133 CL2, it doesnt boot.
The CL2 stick works well in a D815EEA2 (non U) board.

i think i had the same issue 256mb sticks work but not 512.

i would suggest getting 2x256mb pc133 cl2 if u want to squeeze every bit out of it. the def between cl2 and 3 though is pretty small but if u can find some 256 cl2s for cheap might as well.

My single stick 512Mb Kingston KVR13364C2/512 works well on Intel D815EEA and D815EEA2, I have two from those mainboards, only A55991-803 supports Tualatin.

One side of the box, there is L and U indicators. Those represent L = Lan (network) and U = aUdio. Those extensions are not related with actual board names, but batch codes.

https://www.ebay.com/itm/225969430289 here the shown model is LU and has Lan and audio on board.