29 Oct
2008
29 Oct
'08
1:52 p.m.
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