The VAXstation 3520 (and 3540) are dual and quad processor pedestal vaxes (BA213-sized chassis) that DEC breifly tried to sell, with a weird (only used on those models) processor/memory bus called the "M bus". I was hoping that I could get more than 4 CPUs to function in the machine, and after a lot of effort (module order did matter!), I got some encouraging results. I bet no one else here can claim that they've got a "VAXserver 3560"... ------------------------ KA60 V1.2 F..E..D..C..B..A..9..8..7..6..5..4..3..2..1..0 7 01010004 L2003 3 ? V1.3 1 SSC 00000001 2 DZ 00031200 ? 3 NI 19210770 ? 4 SCSI 00000901 5 SYS 00000001 Tests completed. 08-E1,P1 0B-E1,P1 0C-E1,P1 0F-E1,P1 14-E1,P1 17-E1,P1 08 <snipped OpenVMS 7.2 boot> $ show cpu VS3200, a VAXserver 3560 Multiprocessing is ENABLED. Streamlined synchronization image loaded. Minimum multiprocessing revision levels: CPU = 3 FBIC = 1. PRIMARY CPU = 08 Active CPUs: 08 11 12 15 20 23 Configured CPUs: 08 11 12 15 20 23 --------------------------------------------- Note that "VS3200" is the name of the system as the disk was supposed to go into a VAXstation 3200. Also, the system doesn't seem to be completely reliable in bringing up all 6 processors, but that may be related to a firmware version mis-match between processor boards (and/or timing issues when you've got 3 CPU boards). I set out to try to do this 3 years ago now, and finally have managed to obtain enough spare parts (via ebay) to try it out. Pat -- Purdue University ITAP/RCAC --- http://www.rcac.purdue.edu/ The Computer Refuge --- http://computer-refuge.org