Those would be the 'Xen-WS' version, I once used one on a network in the mid 80s (85 or 86, couldn't say which with certainty, but it was while I was in secondary school*), the 'workstation' itself was still running DOS/Win1.x but all storage was on the network. I don't know if it was net booted or had DOS etc in ROM on the network card.

* Although the network and classes were at the local college as some kind of crossover access, I recall another of the classes involved their lab of Apple IIe that had this weird gated access to the internet for email.