PDP-8/L repair

From: Charles <charlesmorris_at_direcway.com>
Date: Wed Jan 15 13:47:20 2003

On Wed, 15 Jan 2003 12:00:01 -0600, you wrote:

>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.

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.

-Charles
Received on Wed Jan 15 2003 - 13:47:20 GMT