It is a multi-processor, multi-processor workstations, snooping, and personal computer.
Charles P. Thacker - one of the founders of many trends in the architecture of modern personal computers, graphic (GUI) design in the 70-80s, worked in the Xerox Research Laboratory (Xerox Palo Alto Research Center).
In addition, he developed caching protocols (snooping cache coherence), some network protocols, and also designed and constructed a tablet PC prototype.