11/[9]4 latest

Is _that_ what it was? I'd have never figured that out in a million years! I'm utterly amazed you didn't fry it - I forget whether the slot you plugged it into was a MUD (hex) slot, or one of the SPC slots (I know the 11/84 backplane has some MUD and some SPC, but I don't know about the /94, and I'm too lazy to look) - but there are some odd voltages on various pins. Well, 0114 is the 'memory system error' vector - i.e. parity, or un-recoverable ECC error. I'm a bit surprised you're getting that, as I'd have assumed the boot ROMs test all the memory. I'm too lazy to read the 11/94 and J-11 manuals to see what the 11/94 has in the way of registers that record memory issues (the 11/73 has, for instance, a Memory System Error Register at 17777744), but that's the next step. That seems a bit odd - the stack pointer is pointing into I/0 space? 772276 is the last Supervisor mode Data space PAR - maybe it's using those registers as a temporary stack? Noel