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?