30 Jun
2016
30 Jun
'16
6:58 a.m.
From: William Degnan
The IOT step is bombing (?) and loops through the
addresses:
This may be a pointless question, but just to clear the ground first: the CPU
is otherwise functioning reasonably well? E.g. it's not dropping the 020 bit
when reading words from memory? (That would convert the '220' new PC in the
vector to '200', and produce exactly the behaviour you are seeing.)
If it is otherwise more or less working, so this is specific to IOT trap
handling, I agree with Fritz - a KM11 would be a big help.
Noel
30 Jun
30 Jun
7:03 a.m.
On Thu, Jun 30, 2016 at 9:58 AM, Noel Chiappa <jnc at mercury.lcs.mit.edu>
wrote:
It was not apparently dropping the 020 bit. The problem was a missing
KJ11, I did not notice the CPU cards were wired for one. When I first got
this 11/40 10 years ago it did not come with it installed, I *assumed* the
machine as I got it was complete. My error. Lesson: Always check
everything.
--
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From: William
Degnan
The IOT step is bombing (?) and loops through the
addresses:
This may be a pointless question, but just to clear the ground first: the
CPU
is otherwise functioning reasonably well? E.g. it's not dropping the 020
bit
when reading words from memory? (That would convert the '220' new PC in the
vector to '200', and produce exactly the behaviour you are seeing.)
If it is otherwise more or less working, so this is specific to IOT trap
handling, I agree with Fritz - a KM11 would be a big help.
Noel
3097
days inactive
3097
days old
1 comments
2 participants
participants (2)
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billdegnan＠gmail.com -
jnc＠mercury.lcs.mit.edu