22 May
2016
22 May
'16
10:09 a.m.
On Sun, May 22, 2016 at 12:33 PM, tony duell <ard at p850ug1.demon.co.uk>
wrote:
Strictly the core backplanes are not Unibus
backplanes. They have Unibus In
and Out connectors, but the slots are wired for the core memory board,
not Unibus boards (like SPCs -- Small Peripheral Controllers -- which is
what
you serial port is).
Tony,
Are you saying remove all of the GC cards, just leave the slots blank?
Here is a photo of what I have now:
http://vintagecomputer.net/digital/pdp11-40/coreplanes_installed.jpg
remove the gc cards from the core planes? I will read up on this more,
just getting started.
thanks.
Bill
Basic Question #1
Do I need grant cards in *every* empty slot of the core backplane,
including the end slots with the M920's?
No. In fact in most cases it is wrong to put grant continuity cards in
there.
However in a lot of cases a special backplane (like your core memory
one) will have some spare slots (perhaps the core memory doesn't take
up all 9 slots). And DEC often (but not always) wired those so you could
put SPCs in there. In which case you will need grant continuity cards in
those
slots if you have nothing else in them.
