What *was* the Tahoe?

I've been looking over the 4.3BSD Tahoe and Reno distributions available in the PUPS archive, and have (what I hope) is a rather simple question: What is the "Tahoe"? It seems - based on the documentation supplied in the Tahoe-specific installation docs - that "Tahoe" generically refers to any of several VERSAbus machines in the Berkeley EECS department. The CCI (Computer Consoles Inc.) Power 6/32 is frequently mentioned as the CPU, but the Harris HCX-7, the Unisys 7000/40, and ICL Clan 7 are also mentioned. Are these all the same architecture and instruction set, or are they different? How was the CPU implemented - on a chip? On a chipset? On a board? On multiple boards? The information regarding peripherals is a bit clearer. There appear to be many different supported VERSABus SMD-drive controllers and at least one supported VERSABus 9-track controller. Are any of the Berkeley EECS Tahoe machines still up and running? How many were there? How many were outside Berkeley? Tim. (shoppa(a)trailing-edge.com) Received: (from major@localhost) by minnie.cs.adfa.edu.au (8.9.1/8.9.1) id MAA01013 for pups-liszt; Mon, 23 Nov 1998 12:01:32 +1100 (EST) (envelope-from owner-pups(a)minnie.cs.adfa.oz.au) X-Authentication-Warning: minnie.cs.adfa.edu.au: major set sender to owner-pups(a)minnie.cs.adfa.oz.au using -f