CLR 765000 LAD EXAM ?Bus Err? light comes on. CLR 765020 LAD CNTRL+START Display changes to 165020 Nothing on the terminal. Do you know which color wire (red, clear, black) goes to which festoon connector (TP1, TP2, TP3, TP4)? Don?t want to blow anything up. Sent from my iPad Good, the console is working. OK, that loads a '0' (halt) in 0. OK, so it reads the HALT at 0 and stops. Sounds like it may be looping in the high bank of ROM? That's not necessarily wrong. I finally figured out what the ROMs in the M9312 do; the ROMs at 765000 are the first-level diagnostic, and the console. The bootstrap code for the various devices is at 773000. That makes sense; you can't write to the ROM. i) Check the ROM contents; there are two kinds of M9312 console ROMs, one for most CPUs, and one for the 11/60 and 11/70, see the tech manual for the M9312. So read out the first couple of words: CLR 765000 LAD EXAM EXAM etc and let's see what they read. ii) Try starting the console code directly: CLR 765020 LAD CNTRL+START Can't hurt. Noel