25 Oct
2012
25 Oct
'12
11:46 p.m.
On Oct 25, 2012, at 3:32 PM, Kevin Reynolds <tpresence at hotmail.com> wrote:
The MicroVAX-II does not require that the memory boards be the same; you can
mix-and-match and it'll work fine.
It seems that
you are getting hard memory write faults on the stack.
Maybe something is hanging up the Q-bus, or you have failing memory. If
you have diagnostics, running a memory test for a while may get you
somewhere. Otherwise, I'd look into trying to pinpoint the problem by
removing memory modules and see if the system becomes more stable
(assuming you have multiple memory cards, of course).
I do have multiple memory modules, there are two in the chassis. I have spare modules,
but they aren't the same, so I am not sure they will work in the system. I did pull and replace the CPU, Memory and VCB02
modules, but the result is the same. The system did work fine recently, so I assume that
the CSR/Vectors are ok on the cards. I don't have the manuals for everything, but
maybe bitsavers does.
Most (all?) of the relevant docs are on bitsavers, but I'd agree with your thought
that it's likely not a configuration problem.
I don't have any spare grant continuity
cards...will this cause me trouble if I just pull a ramcard out and have nothing in its
slot? I seem to remember that you couldn't have an open slot between cards, unless
you had a grant card in there...
You'll need something in that empty slot, yes.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA