I just looked in my basement. I have an old core memory
board. It has "8K" written on it in marker. It is a daughter
board plugged into a larger board labeled "SENSE/INHIBIT
BOARD 44P0506" with a hand written note "from Varian." I
don't remember where I got this. I don't recall any Varians.
We used PDP and Burroughs computers. This was a couple of
years ago. 8-)

The Varian manual (available online) refers to this as a
"MEMORY T&CONT ASSY." I don't know what "T&CONT" refers to.
The big board is about 7.75 x 12 inches. The small (memory)
board is about 7.75 x 7.5 inches. Imagine putting that in
your cell phone!

Allen

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-
> bounces@mit.edu] On Behalf Of RussellMc
> Sent: Tuesday, August 13, 2013 8:44 AM
> To: Microcontroller discussion list - Public.
> Subject: [SPAM-LOW] [EE]:: Superb article on DIY core
> memory interfacing
>=20
> Superb article on DIY core memory interfacing
>=20
> The article begins:
>=20
>     "Have you ever looked through the surplus catalogs
arid
> wondered
> whether those memory core planes and stacks advertised
> could be used for
> anything other than tea strainers? How are they supposed
> to work, and what
> kind of circuitry is required? Could you troubleshoot and
> repair that
> surplus core memory and drive electronics? What good is a
> core stack
> without data? Is it a worthwhile project to build a memory
> system around a
> core stack? ..."
>=20
> It's a reprint from Byte magazine, 1976 !!! :-).
> (I may even have a copy :-) ).
> 37 years (!!!!) on some people are still interested in
such
> things -
>=20
> Coincident Current Ferrite Core Memories
>=20
>             http://ed-thelen.org/comp-hist/Byte/76jul.html
> >From July 1976 *Byte Magazine* (Permission Requested)
> OCRed from http://retro.co.za/byte
> It looks like the writer, Jim Jones, is still with us:
> http://other-1.webs.com/
> <http://other-1.webs.com/>
>=20
> ___________________
>=20
> His references:
>=20
>    - "Fundamental principles or Switching Circuits and
> Systems", New York:
>    American Telephone and Telegraph Company, 1961.
>    - "The Integrated Circuits Catalog for Design
Engineers",
> Dallas; Texas
>    Instruments, Inc (First Edition).
>    - Daly, Edmund B: "Noise Problems in Ferrite Core
> Coincident Currant
>    Memories." Computes Design (November 1967), 46-50.
>    - Hawkins, Joseph K: "Circuit Design of Digital
Computers".
> New York:
>    John Wiley and Sons, 1968
>    - Kirkpatrick, T, and D Johnson: "Design of Meal
Low-Cost
> Core Memories
>    for SLT Systems." Computer Design (April 1968), 60-71.
>    - Smith, James E "A 650 Nanosecond 2-1/2D Memory"
> Computer Design
>    October 7966), 80-87.
>    - Zinschlag, Howard p: "A 2-1/2D Integrated Circuit
> Memory" Computer
>    Design (September 1966), 26-39.
>=20
> ___________________
> Via
> Antique (lonesome) Computers
> http://ed-thelen.org/comp-hist/index.html
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list
> archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist


--=20
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