On March 24, Robert Schaefer wrote: For the most part, Sun was relatively consistent about their numbering schemes. Here's how they work: For model names of the form "Sun-X/YZ0": X = architecture...2, 3 or 4, 2=68010, 3=68020 or 68030; 4=SPARC Y = processor...1, 2, or 4 for Sun-3; 1, 2, 3, 4, 6 for SPARC Z = VME chassis type...1 or 4 for 3-slot; 5 for 6-slot, 6 for 12-slot deskside, 7 for newer purple 12-slot deskside, 8 for 12-slot rackmount, 9 for newer 16-slot rackmount There are some departures from this numbering scheme (3/110 for example) but it is mostly consistent. Not all combinations were sold by Sun, but most could be built. With the exception of the Sun-2 VME P2 bussing, the VME buses are compatible between all processor and chassis types. -Dave -- Dave McGuire "Watch those lateral G's man, St. Petersburg, FL I've got sandwiches in my lap!" -Sridhar