Woohoo, I finally, after over a decade of being somewhat out of the pdp11 hobby, have managed to bring back to life one of my pdp11/34s! It's a plain 11/34 with dl11-w, ky11-lb, ms11-L, rl11 and a M9312 terminator/boot rom board. I have an emulex controller and some fuji 160s I'll tack on later so I can run 2.9BSD once I get the basic build confirmed safe. It's not in great shape at the moment, apparently, as these xxdp 2.5 diags are crashing left and right. But it at least boots the os and tries. I initially had, but mysteriously lost the console emulator/ODT functionality, seems it's starting at 165000 instead of 165200 at poweron. Maybe a 9312 switch mis-set... So I'm booting from the panel by calling the address of the ODT or the rl02 boot rom, which does the trick. Would anyone care to recommend some xxdp diags I should be running or next steps to isolate what's wrong / right with it? thx jake P.S. I tried to boot rsx11m v4.1, but got a strange crash with all zeroes in the stack and registers. What might that indicate? @DL0 DEVICE DD000: NOT IN CONFIGURATION DEVICE DD100: NOT IN CONFIGURATION DEVICE DY002: NOT IN CONFIGURATION DEVICE DY102: NOT IN CONFIGURATION MEVICE NI002: NOT IN CONFIGURATION RSX-11M V4.1 BL35 124.K MAPPED SYSTEM CRASH AT LOCATION 000000 REGISTERS R0=000000 R1=000000 R2=000000 R3=000000 R4=000000 R5=000000 SP=000000 PS=000000 SYSTEM STACK DUMP LOCATION CONTENTS 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 000000 CRASH -- CONT WITH SCRATCH MEDIA ON DY0