5 Nov
2003
5 Nov
'03
8:07 a.m.
Forwarded message:
From: jim <jwstephens(a)msm.umr.edu>
Robert Krten wrote:
Nope, unfortunately. I've been running "junk programs" and it looks like
they scribbled all over memory; I looked through the first thousand or
so memory locations, hoping for a 4000 bit, but no luck :-(
If I deposit 7777, I can examine and get 3777.
This machine has 8k of
core, and the problem is the same in both 4k banks.
Cheers,
-RK
when you read memory, are here any locations where you get back a 1 bit
in this position from residual junk data in the core? might be a clue what is wrong with deposit vs rad.
can you examine other registers from the front panel and change that bit, or
is it just the core?
No other registers are accessible from the front panel -- you're think of the
PDP-11 :-)
if you can examine the registers, IIRC, can you put a
program in there to load
a constant and deposit it in core? This would exercise a different path to the
core, though I know that the front panel is probbly doing a step to do the
deposit.
I may be crossing wires with the pdp11 as far as the registers being
addressible in
memory, if so I apologize, it's been a long time, and I have no handy manual to
verify
this for you.
No problemo; appreciate any help I can get :-)
Cheers,
-RK
--
Robert Krten, PARSE Software Devices +1 613 599 8316.
Realtime Systems Architecture, Consulting and Training at www.parse.com
Looking for Digital Equipment Corp. PDP-1 through PDP-15 minicomputers!