I have a new-to-me 11/04 in the kitchen, and I'm having some very odd problems with it. Slot 1 - M7263 11/04 CPU Slot 2 - empty Slot 3, AB - M9301-YA Slot 3, c-F M7859 KY11-LB Console interface Slot 4, C-F M7856 SLU, switched for 9600bps, 8N1, 20mA C.L. console Slot 5-6 - G657/H228-B 64KW core assy. Slot 7-9, D - G727 grant continuity modules Slot 9, AB - M9302 Terminator In the "book" configuration, as above, it boots to zeroes on the console LEDs with the RUN light and SR DISP lit. I can CLR the SR DISP, but the only other response I get with the panel is by halting it (CNTRL-HALT), which lights the BUS ERR light. On the other hand, if I remove the M9302, the system powers up to 000002. I can load and examine addresses from the console, deposit code, etc. CNTRL-HALT increments the counter, and CTRL-BOOT brings up the console emulator on the VT220. I can run L, E, D, and presumably S commands from the console emulator. Since I don't have any mass storage on it yet, that's as far as I've gone. Last, if I replace the M7263 with an M7266 and M7265 in slots 1 and 2 respectively, All the above applies excpt there's no terminal output. There's something decidedly un-kosher there, and I'm not catching on. It doesn't help that the processor handbook I have assumes MOS memory and contradicts everything I can find on Teh Inturnet about board placement. (It says something about CC that I'll try configurations I've seen twice in the archives over DEC's own literature.) So, the questions: Is there a simple program (or set of) I can key in to test operation? I'm no programmer, so you'd need to tell me the expected result, too. Is this correct behavior? Running without a terminator seems very wrong. (I've tried replacing the G727 cards with G7273 NPG cards, BTW) I keep seeing references to the DIP switch settings on the M9301 board, but I can't find a reference to tell me how they should be set. Are we having fun yet? ;-) Yes, this is my two weeks at home between travels, my wife is visiting her mom in New England, and I'm catching up on Geek Time. There are 3 PDP-11s, a new-to-me IBM 9348-012 9-track tabletop, several terminals, laptops, and monitors, and an Amiga A3000 in the dining room right now. *I'm* having fun. Doc