PDP-8/I memory problem

From: jim <jwstephens_at_msm.umr.edu>
Date: Wed Nov 5 11:23:59 2003

Robert Krten wrote:

>
>
> 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?

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.

Jim

>

>
Received on Wed Nov 05 2003 - 11:23:59 GMT