Fair warning, I know nothing about these boards outside of their existence. But, 'from the hip', I'm guessing that they are just daisy chaining bridge chips (PC

Fair warning, I know nothing about these boards outside of their existence. But, 'from the hip', I'm guessing that they are just daisy chaining bridge chips (PCIe -> PCI -> ISA). ITE makes some PCI -> ISA bridges and I see big ITE logos on both. If one really wanted to use an ISA card, they could just buy a couple (rare, but noticeably more obtanium) risers with the relevant bridges on the riser to recreate the chain. I don't know if that mean missing out some fancy integration (for better compatibility) from the bios.