18 Apr
2019
18 Apr
'19
11:45 p.m.
I believe 3 wire memory was first introduced by IBM in their 360 systems, and it was a
very large development effort. They would almost certainly have patented their way to do
it, but I have not checked.
Marc
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of "cctalk at
classiccmp.org" <cctalk at classiccmp.org>
Reply-To: Jon Elson <elson at pico-systems.com>, "cctalk at
classiccmp.org" <cctalk at classiccmp.org>
Date: Thursday, April 18, 2019 at 7:08 PM
To: Noel Chiappa <jnc at mercury.lcs.mit.edu>, <General at ezwind.net>,
"cctalk at classiccmp.org" <cctalk at classiccmp.org>
Subject: Re: Plane of core memory
On 04/18/2019 03:15 PM, Noel Chiappa via cctalk wrote:
From: Jon Elson
As soon as somebody figured out that you could combine
the sense and
inhibit wires, everybody immediately went to 3-wire
planes.
I"m suprised the idea wasn't patented. Or maybe it was, and they made the
license widely available at modest terms?
I was thinking the same thing, but can't find any references
to who invented it. it certainly sounds like the sort of
thing to get a patent on.
Point of interest, my freshman advisor was Bill Papian, who
was Jay W. Forrester's grad student when he invented
coincident-current core memory.
Jon