BIOSTAR Releases the BIH61-AHA Socket LGA1700 Industrial Motherboard with PCI Slots and Legacy IO

[Wirko]

You are totally right with that, but some chips fail to work with certain PCI cards either way, we don't know how many clock cycles it takes to translate each PCIe command to PCI and sync it. There are also erratas with each IC thus those come with ugly workarounds.

Now that you said this, a board with PCI slots suddenly looks like a bad solution... because you're stuck with a specific bridge chip, and you may find out too late that it's useless with the expansion cards you have.

 

[Ferrum Master]

PCI slots suddenly looks like a bad solution...

It all depends on the code. If someone coded a working solution it makes sense still to do it... porting to another platform ain't a option usually these days the code maintainer is either dead or retired already.

New designs are made with new parts... and not x86 based... nowadays we have plenty of choice... you can a proper flying bomber drone using STM32 .

 

[LabRat 891]

They use the same ICH10R south Bridge, it provides one native 32MHz PCI. If you wish PCI-X 100/133MHz there are versions with companion bridge Intel PXH-V providing it. Like SuperMicro X8SAX (the name stucks for ar reason). That could be your holy grail. Maybe there are newer boards using that PCH, I know it was used in 775 boards also, I haven't seen personally, maybe someone else is.

Looking at the datasheets for 6700PXH (PXH) and 6702PXH (PXH-V) -Yes, I'd say you're correct.
Also, looks like there's some other chipsets that integrate the PXH(-V) (Like E7221, 3200/3210, etc.)

Any Sossaman-supporting (or, Yonah) boards (Socket 479/M/P w/ microcode injection?) use those bridges/hubs? [the 6300ESB on the SM X6DLPs' Lindenhurst E7520 is only 66MHz PCI-X] Now, there's a Curio platform. Last of the 32-bit P6 uArch

Now, trying to swing this back on track...
I see these Hubs/Bridges as eWaste pulls, and purchasable. 'Kinda makes me wonder if anyone (in China?) is making PCI-E->PCI-X riser-adapters with these or, new-PCB recycled-ASIC boards*?
*Like those 'gamer' boards, that re-use server chipsets. I'd imagine the need$ for 'legacy' support, is hardly a Western problem.

Now that you said this, a board with PCI slots suddenly looks like a bad solution... because you're stuck with a specific bridge chip, and you may find out too late that it's useless with the expansion cards you have.

Depending on the importance and integration of whatever needs it... I've seen single-company solutions made by specialty providers. (Also, there's a few Industrial-only standard interfaces most enthusiast-gamers have never seen. I've ran across nearly every imaginable flavor of bridge, for those applications.)

Edit: Here's an example of an Intel-based PCIe x4 to 133/100/66/33 PCI-X 64-bit bridge and enclosure. Made by GE

https://ecrin.com/datasheets/GEFIP/PCIE-PCIX-7S.pdf