Yeah. SDS (later XDS) was bought up by Xerox just before Xerox launched PARC. In the "Fumbling the Future" book, there's several pages describing how PARC has to constantly push back against corporate who were trying to fold it (PARC) into SDS.
I wrote my first Lisp program on a 940 back in the 70s. IIRC, the Sigma series were the machines XDS built after the 940. I don't know they were super popular, but maybe you might have heard of them.
