22 Nov
2016
22 Nov
'16
8:43 p.m.
On Tue, Nov 22, 2016 at 8:13 PM, Guy Sotomayor Jr <ggs at shiresoft.com> wrote:
I seem to recall something similar with one of the 11/40?s I was working
on. I believe that because the 11/40 CPU backplane is wired for an M787
that things don?t work quite right if you try and install an M7856 into the
SPC slot in the backplane and try and use it and not the M787. There is a
way to jumper the CPU backplane so you can use na M7856 and not the M787.
I haven?t really investigated it in detail (and it?s been a long time since
I messed around with the 11/40 at that level).
TTFN - Guy
I have my 11/40 fired up right now too. I can load BASIC and I have a
M9312 with a M7800 that returns serial signals/monitor running. I have the
CPU backplane, two core planes (empty), a DD11B and an DD11C. I can
operate without a grant card in slot, but I can't boot up using RL02 either
way, still trying to track down if I have a UNIBUS issue.
If there is something I can measure for you, for comparison purposes, let
me know. I will be around tomorrow too during the day. I live near Phila,
it's 845PM Tuesday at the moment here.
BIll
On Nov 22, 2016, at 4:40 PM, Josh Dersch
<derschjo at gmail.com> wrote:
So... maybe I just completely missed the memo on this, and maybe there's
still
something wrong with my backplane... is it possible that slot 9 of
the 11/40's CPU backplane is wired *specifically* for an M7800? I guess I
need to spend some time tonight seeing what the differences are... but now
I need to go attend to a cranky 2yo who just woke up from a nap?