22 May
2016
22 May
'16
10:22 a.m.
The core memory/CPU backplane is a special case and doesn?t need grant cards.
If you have linked up to the expansion Unibus then you need to check you have the NPG
jumper in row C, Pins A1 and B1 in each slot. If these do not have wire wrap then you will
either need to wire wrap them or insert a G727 into the backplane slot. Without these the
units will hang on attempting to use a card that requires DMA access.
Hope this helps.
Mark
On 22 May 2016, at 18:10, tony duell <ard at
p850ug1.demon.co.uk> wrote:
Are you saying remove all of the GC cards, just
leave the slots blank?
Yes, from the slots that are designed to take the core memory or its
controllers (I assume, given you have special backplanes, there are
boards with the core planes on, and more boards with the XY drivers
or the sense/inhibit logic on).
Do you have a diagram of where the core boards should go. If so, are
there slots in the backplane left over. What are those 'extra'
slots for?
-tony