4 Oct
2015
4 Oct
'15
12:26 p.m.
-----Oorspronkelijk bericht-----
From: tony duell
Sent: Sunday, October 04, 2015 9:09 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: RE: PDP-11/10 repair started
Oops, I forgot to mention a few other checks that I did ...
AC LO and DC LO are some 4.6V. Both have a 130 mV ripple, no spikes.
That seems OK to me.
Sure, those sound OK to me too. But you would have felt a right idiot if you
had spent days working through the microcode and CPU logic only
to find the real cause was something like that. Yes, I've been there,
done that...
[...]
Thanks for the tip checking the microcode program
counter. I hope to
get to that next weekend. Also, with the correct module on extenders
I will check what toggling LOAD ADDRS does signal-wise. Looking at
the console LEDs it does nothing :-/
[... snip good microcode stuff ...]
Incidentally, is this an 11/10 or an 11/10S (what are the M-numbers on the
CPU boards)?
-tony
=========
Tony,
the microcode is "on the menu" for next weekend ...
The system is a 11/10S, CPU is M7260 and M7261.
- Henk