DEC PDP-8/e H212 core mat repair

[Tom Hunter]

Thanks Josh,

I read through both patents but struggled to fully understand what they
described.
Unfortunately patents are written in broad terms to cover as much as
possible.

It was very interesting nevertheless.

Best regards
Tom Hunter

On Mon, Jul 19, 2021 at 4:52 PM Joshua Rice via cctalk <
cctalk at classiccmp.org> wrote:

>
>
>
> ------ Original Message ------
> From: "Tom Hunter via cctalk" <cctalk at classiccmp.org>
> To: "General Discussion: On-Topic and Off-Topic Posts"
> <cctalk at classiccmp.org>
> Sent: Monday, 19 Jul, 2021 At 06:33
> Subject: DEC PDP-8/e H212 core mat repair
> I am curious if anyone has attempted to repair (replace) a broken wire
> in a
> PDP-8/e H212 (MM8EJ) core mat (8 k word). The cores are not visible
> without
> a microscope. I cannot imagine how these were even manufactured and
> wonder
> if DEC service centers repaired core mat faults or if faulty boards were
> simply discarded.
> CDC 6600 cores were huge in comparison and I would not hesitate to
> replace
> a broken core wire on those.
> Best regards
> Tom Hunter
>
>
> These patents might be enlightening. I'm sure there's others, but these
> are some i've found on a quick search.
> https://patents.google.com/patent/US4161037A
> <https://patents.google.com/patent/US4161037A>
> https://patents.google.com/patent/US3668664
> <https://patents.google.com/patent/US3668664>
> Josh
>