Old core memory system.

dwight dkelvey at hotmail.com
Sat May 5 23:05:32 CDT 2018

Fabri-tek was a common supplier for core memory. Many companies used their memories. Fabri-tek Instruments became Nicolet Instruments in 1971.

I'm not sure one could tell what machine it was used for. It was a common memory system. They did make a lot of memories for military use.


From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Bob Smith via cctalk <cctalk at classiccmp.org>
Sent: Saturday, May 5, 2018 12:36:07 PM
To: Chuck Guzis; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Old core memory system.

SDS built a 24 bit system with Parity too, the CDC 924 was 24bit,
there were a few others and I believe but can not recall for sure, a
navy 24 bit maybe done by ERA.


On Sat, May 5, 2018 at 2:32 PM, Chuck Guzis via cctalk
<cctalk at classiccmp.org> wrote:
> On 05/05/2018 10:23 AM, Pete Lancashire via cctalk wrote:
>> Core temp was a big issue even in commercial environments. You didn't see
>> it temp but you would see core [driver] current.
> The early IBM 7000 series (7070, 7080, 7090) kept core in a
> temperature-regulated oil bath.  Later versions used pre-heated air
> (e.g. 7094 core).
> On the CDC 7600, hitting the same area of care repeatedly could cause it
> to overheat and throw parity errors.   Circuitry to detect this would
> slow-down repeated accesses.
> That was for CM.  I seem to recall someone telling me that there was no
> such provision in PP core and a "jump to self" was sufficient to throw
> an error--but that may be a shaggy-dog story.
> --Chuck

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