imitation game movie

Mike Stein mhs.stein at
Wed Feb 11 01:24:25 CST 2015

> Would we have developed ultra-fast recirculating 
> memory?

Now there's an idea (has it been tried?); the 
equivalent of an acoustic delay line memory using 
fiber optics...


----- Original Message ----- 
From: "Chuck Guzis" <cclist at>
To: <General at>; 
"Discussion at and Off-Topic 
Posts" <cctalk at>
Sent: Wednesday, February 11, 2015 1:38 AM
Subject: Re: imitation game movie

> On 02/10/2015 09:56 PM, Jon Elson wrote:
>> Oh, absolutely!  There was a lot of work on 
>> using ferrite rings as storage
>> and logic elements at that time, but Forrester 
>> and Papian really
>> extended what had been done before, and the 
>> coincident current
>> scheme was really ELEGANT and made large arrays 
>> of fast memory
>> practical.  The bigger you built the array, the 
>> more memory you got
>> with small increments in the number of drivers.
> Didn't coincident-current relays come before 
> that (as used, for example, in telephone 
> switching equipment)?  So the basic idea was 
> there.
> I've always been fascinated by magnetic core 
> logic; both using "hard" magnetics (e.g. Univac 
> SS) and "soft" (e.g. Parametrons).  I wonder if 
> magnetic core for memory hadn't been developed, 
> would we have developed electrostatic or some 
> other technology to the same density?
> Would we have developed ultra-fast recirculating 
> memory?
> --Chuck

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