After writing the last message, I wrenched the machine out of the rack onto a table and found that: Slot 14 had a jumper Slot 13 did not. So after three or four boot-ups with various clip leads installed, I have taught myself that the jumpers are not needed in 13 and 14 if the RL11 and Emulex cards are in them. And: woo-hoo! I have the cards in the slots I wanted them to go in, and the machine boots and runs as normal. Mebbe tonite I'll drag up some RL02s and see if I can get them talking to the RL11. I still am not sure about the driver modules: from whence they come (distribution kit?) and how they get integrated into RSTS. Does one just copy them into the working directory? Does a partial SYSGEN need be done? Are they already there, just hiding? Thanks... John