Topic: HDSP 9652, legacy PCI motherboards, PCI - PCIE adapters etc..
After having spent considerable time looking around for legacy PCI slot mobos the last couple of weeks, I've decided to go with adapters for my 9652s when upgrading my PC the coming days. Sure, there are mobos out there, but settling for either one of them implies too many compromises for my taste, both performance-wise, stability-wise, and with regards to future upgradability. The AM4-socket Asus Prime X370 looked like a winner for a long time, until I realized it needs a BIOS update right out of the box to accept the latest Ryzen 3000 series CPUs. No problem updating BIOS as such, however, a previous generation (Ryzen) CPU is required for the update process to run.
A handful other mobos I found would accept 8th and/or 9th gen Intel Core CPUs, but were based on either the Bxxx or Hxxx chipset, both of which are considerably more modestly spec'd and lacking in performance compared to Zxxx chipset mobos, and don't support overclocking.
Eventually I ditched the whole PCI-slot mobo idea, and started searching for adapter/conversion solutions instead. That proved quite fruitful rather quickly. There are actually loads of alternatives out there, everything from simple, basic and really cheap to complex, multipurpose and really expensive, internal, external, USB, fiberoptic, you name it. I've compiled a list of links to some of them below, hope it'll be useful.