On Mar 30, 22:30, Olminkhof wrote: The first address is in RAM, which is interesting. It suggests the processor is executing some bootstrap that gets copied into memory. 173000 is the standard bootstrap address; every time you restart the CPU, it sets the program counter to that address. The "&" is not any normal PDP-11 prompt, so that must have come from the disk or custom boot roms. -- Pete Peter Turnbull Dept. of Computer Science University of York