PDP-11/45 RSTS/E boot problem

Well, there?s wisdom there, for sure! :-) Last night I also managed to put a new RSTS image, sysgen?d with the non-overlapped DK driver, on a different physical pack. It behaved exactly the same way on the real hardware (looping, counting up errors) on boot. So I think now overlapped vs. non-overlapped DK driver is not the issue, and media and image transfer fidelity are not the issue. A memory or MMU problem would be consistent with what has been seen so far, so I may bark up that tree a little more today. Paul, any additional suggestions for things to look at in ODT to try and wring out more information on the specifics of the fault? I did get some MACRO CRC-16 sub-routines coded up last night while waiting for various transfers, so I think I?ll go ahead and finish up the standalone CRC dumper utility today. Lastly, a 5V-tolerant USB FIFO breakout board is supposed to show up in the mails today. If that works out as simply as I hope to interface with a DR11-C, I should have a much better way to blast bits on and off the machine soon. cheers, --FritzM.