15 Jan
2003
15 Jan
'03
9:11 a.m.
From: Charles <charlesmorris(a)direcway.com>
On Wed, 15 Jan 2003 12:00:01 -0600, you wrote:
The problem was, since my machine does not come with the parity
option installed, there are a few empty slots in the otherwise
unbroken string of handles touching each other...I still am
annoyed for doing it to myself though ;)
Now to fix the core memory.
<HOPE> Shouldn't be too hard to find </HOPE>
since it's doing nothing. If it had flaky bits or words or pages,
different story, but absolutely dead can only be a few things.
Ya, like a broken core sense wire!
For the times I don't have an extension card, I solder some
wires to points I expect to measure and tape them to a strip
of wood that I lay on top of the machine. It is slow but
works OK. It wouldn't work on a real fast machine because
of reflections of unterminated lines but these older machines
are not all that troublesome with one foot or so of wire.
Dwight
If you have an extender card, you should
be able to trace the fault pretty quickly with a logic probe or
an oscilloscope.
Without an extender card, it's a lot harder.
I agree. I have both an extender card and a scope, fortunately,
and have been using them extensively!
This
weekend, after quite a bit of signal chasing, I found that I
had put the variable delay line in the wrong slot some time ago
while cleaning connectors/mice nests!
I've done stuff like that.
-Charles