On 1/5/19 2:58 PM, Fritz Mueller via cctalk wrote:
On Jan 5, 2019, at 8:07 AM, Noel Chiappa via cctalk <cctalk@classiccmp.org> 
wrote:

From: Fritz Mueller
All the CPU, FPU, KT11, KW11, and RK11 MAINDECS are passing just fine.
Don't forget Vonada Maxim #12:
  "Diagnostics are highly efficient in finding solved problems.”
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.

Along those lines if you have a spare disk pack, try putting RT11(FB,XM) on the machine and give it a workout.   This would exercise the machine a bit more than MAINDECS, though not as much as RSTS.

A few suggestions from my ancient history running RK11-C and a mix of DEC and Diablo Drives.  I regularly disassembled, moved cross country and reassembled PDP 11/34 and LSI 11/73 systems. I ran them in small rooms which housed saltwater tanks containing sea creatures.

 * Given the age of this equipment, double check all the ground
   connections between the cabinets, PDU's, drives, outlets and CPU.
 * Carefully check for breaks or problems with drive cables and
   terminators.
 * I believe you need a terminator in the RK11-C if the second disk bus
   is unused.
 * Try using the drive on the other bus if RSTS can be booted of from DK4.
 * Make sure you only have one LTC active if a DL11-W and a KW11 are
   both in use.
 * If you are not using a common PDU for the CPU, Drive and RK11-C
   power supplies, make sure they all powered from outlets on the same
   phase.
 * Don't leave the disk packs or drives near the tanks.  The squid have
   good aim and their ink isn't kind to electrical devices.

    Jerry

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