13 Feb
2019
13 Feb
'19
5:34 a.m.
On Feb 13, 2019, at 2:43 AM, Fritz Mueller via cctalk
<cctalk at classiccmp.org> 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.
Congratulations. You have successfully performed a repair of the type done at customer
sites by highly trained DEC field service personnel. They were the ones who traveled with
an oscilloscope, a tool case including soldering iron, and a case full of replacement
chips.
One difference is that the diagnostics didn't point to the problem, which in my
experience is rather an unusual situation. Nicely done.
paul