40k Ferrite Memory Core

[Gavin Melville]

Hi Chuck,

Could you PM me off list about magnetic core logic if interested.

gavin.melville at acclipse.co.nz

Regards,
Gavin.

--------------------------------------------------
From: "Chuck Guzis" <cclist at sydex.com>
Sent: Thursday, October 30, 2008 9:30 AM
To: "General Discussion: On-Topic and Off-Topic Posts" 
<cctalk at classiccmp.org>
Subject: RE: 40k Ferrite Memory Core

> On 29 Oct 2008 at 12:52, Rick Bensene wrote:
>
>> I agree with Brent's analysis.  I too counted 21 planes, which seems a
>> bit odd, as typically each plane represented one bit in a word
>> structure, which would indicate a 21-bit word...not something that
>> matches up with commonly-used word sizes in 50's/60's era computers (12,
>> 16, 18, 20, 24, 32, 36, 48, 60 or 64 bits).
>
> An extra parity bit per word was very common(some Seymour Cray boxes
> excepted). My guess is this might be from a GE 200-series mainframe.
>
> Can one still get ferrite cores with hard magnetization curves for
> logic any more?  I've always had this secret desire to play with
> magnetic core logic (not memory).
>
> Cheers,
> Chuck
>
>