More PDP-11 questions

Hi, Apologies for the constant stream of questions at the moment, I hope I'm not consuming too much list bandwidth at the moment. I've brought my whole collection out of storage and I'm bringing them all back to working condition and going through a steep old learning curve with my Unibus machines! So here are the latest round of questions: 1. I have started work on a second 11/05 I have. At the moment it has a processor, an 8K core set, NPR cards and a pair of unibus terminators. At present when powered up the machine has its run light constantly on, shows what looks like a random set of lights on its address/data LEDs and doesn't respond on its console. I have tried swapping the CPU boards and core cards for known working cards with no success. I have also hooked up a scope and confirmed the power supply is supplying correct voltages. Any ideas on what could be causing the bus error? 2. I have a Plessy PM1116/B core card. This is a single slot solution consisting of driver/sense logic on a card and a core plane on a daughter board. Does anyone have any details/documentation on this card or any idea of what slot would be suitable to plug it into (on a 5 1/4" 11/05-8KW backplane). 3. I have an 11/34A (in 5 1/4" box) which is experiencing a similar constant run light problem to the 11/05. The machine has CPU cards, terminators, console card and a MOS memory board in it. With both terminators in, run light stays on. If I halt it, the bus error light is illuminated. If I remove the end terminator and power on, the console is responsive and I can deposit values into memory and read them back. As with the 11/05 I have connected a scope and checked the power lines are supplying the correct voltages without any oscillation. Any ideas? Many thanks, Toby -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.