6 May
2018
6 May
'18
12:05 a.m.
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.
Dwight
________________________________
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.
bb
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