24 Mar
2009
24 Mar
'09
2:55 p.m.
Rod Smallwood wrote:
Hi
My pdp-8/e has developed a nasty fault.
Its straight forward enough of a fault. I can no longer toggle in values via
the switch register.
Does that mean you can read the current contents of the core or is it
all 0000?
Can you step through memory examining successive locations?
If you re-read them, do they change or is it the same?
When you deposit to a location it reads back as 0000?
My meager understanding of the -8/e makes me think we will need this
kind of information to narrow down the source of the problem. Since core
memory reads are destructive, we can eliminate some core issues if you
say that core can be read repeatedly without it's contents changing. It
could be a problem with the path between the switch register and the
memory data bus.
My two cents worth...
-chuck