MicroVAX II - TK50 problem

the uVAX II has a Q22/Q22 backplane so the positioning of the TQK50 is important, as is the RQDX(2/3) disk controller which should be last on the bus. The first 3 slots are CD types and are reserved for CPU/Memory, the rest (I can't remember which size cab you've got) are serpentine so if you've only got the CPU, 2 mem boards and the disk/tape controllers then the TQK50 should be on top of the RQDX3. I notice 8 TX lines which means there's a quad-height DHV11 there, probably next to the memory. If you've got a DEQNA ethernet half-height board as well then that'll mean you have TQK50/DEQNA occupying a quad-height slot and the RQDX3 on its own in the AB side of the slot next to that. Google for 'vax q22/q22 backplane' and you'll find an excellent explanation of how the uvax backplane works. cheers a/w