1 Nov
2010
1 Nov
'10
9:54 a.m.
Date: Sun, 31 Oct 2010 14:22:35 -0400 (EDT)
From: "O. Sharp" <ohh at panix.com>
Subject: Re: Repairing core memories....
On Sun, 31 Oct 2010, Jos Dreesen wrote:
So I have these 2 PDP-8/L core stacks I am trying to
recover:
One would be perfect, if bit 3 @ adr 0 would be alive...
Although this is 99.99% OK, it is of course not good enough.
<snip>
I suspect I'm not the only one on the list who:
-thinks opening up a core-stack and repairing it is
theoretically possible;
-also thinks it would be a hell of a daunting project;
-is somewhat amazed at the dexterity and patience of the people
who originally hand-wired them at manufacture; and
-thinks pulling off a repair of a core-plane by rewiring it by
hand would give significant bragging rights. :)
-O.-
+++++++++++++++++++++++++++
Agreed ;-)
But if anybody does want to, I've got a small (220x16) MDS (Fabri-Tek) core
plane with an already damaged section, cut-off edge connectors etc. to
practice on; for even more fun I could even throw in a few of two different
sizes of raw cores...
mike
1 Nov
1 Nov
10:14 p.m.
From: dm561 at torfree.net
To: cctalk at classiccmp.org
Subject: Repairing core memories....
Date: Mon, 1 Nov 2010 11:54:47 -0500
Date: Sun, 31 Oct 2010 14:22:35 -0400 (EDT)
From: "O. Sharp" <ohh at panix.com>
Subject: Re: Repairing core memories....
On Sun, 31 Oct 2010, Jos Dreesen wrote:
Hi
One does have to match the cores. For this you have no choice but
to find a scrap core plane to get replacements from.
Each core, even though the same physical size, has a different
magnetic property. All the cores need to match. Having one
So I have these 2 PDP-8/L core stacks I am trying
to recover:
One would be perfect, if bit 3 @ adr 0 would be alive...
Although this is 99.99% OK, it is of course not good enough.
<snip>
I suspect I'm not the only one on the list who:
-thinks opening up a core-stack and repairing it is
theoretically possible;
-also thinks it would be a hell of a daunting project;
-is somewhat amazed at the dexterity and patience of the people
who originally hand-wired them at manufacture; and
-thinks pulling off a repair of a core-plane by rewiring it by
hand would give significant bragging rights. :)
-O.-
+++++++++++++++++++++++++++
Agreed ;-)
But if anybody does want to, I've got a small (220x16) MDS (Fabri-Tek) core
plane with an already damaged section, cut-off edge connectors etc. to
practice on; for even more fun I could even throw in a few of two different
sizes of raw cores...
mike
from the same manufacture and time span is about the
only way
to get the desired results.
Before I started reworking the core, I'd try swapping some
of the external wires to make sure the problem moved with the
core and not the address line drivers.
Dwight
5164
days inactive
5165
days old
1 comments
2 participants
participants (2)
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