On 2/13/2019 1:43 AM, Fritz Mueller via cctalk wrote:
SUCCESS!!
Put the M795 out on an extender, loaded 167777 in RKBAR, and had a look around with a
logic probe. Narrowed it down to E34 (a 7430 8-input NAND). Pulled, socketed, replaced,
and off she goes!
I can now successfully boot and run both V6 Unix and RSTS/E V06C from disk.
*THAT* was a really fun and rewarding hunt :-) First message in the thread was back on
Dec 30, 2018. Lots of debugging and failed DRAM repairs, then the final long assault to
this single, failed gate...
Thanks to all here for the help and resources, and particular shout-outs for Noel and
Paul who gave generously of their time and attention working through the densest bits,
both on and off the list.
I predict a long happy weekend and a big power bill at the end of the month :-)
cheers,
--FritzM.
Congratulations. As another poster mentioned, it has been fascinating
to watch and learn, day by day, as you worked on the problem with Noel
and Paul's help.
And I learned a little bit more about my 11/45 (that it indeed had had a
processor field upgrade), which I had not looked at very closely before.
Maybe that story about FE's using Unix as a test to confirm operation
even when diagnostics said the machine was OK was not so much just a
legend?