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Re: Core memory
- To: Steve VanDevender <stevev@efn.org>
- Subject: Re: Core memory
- From: kgstar@most.fw.hac.com (Kelly Starks x7066 MS 10-39)
- Date: Tue, 12 Mar 1996 14:36:37 -0500
- Cc: T.L.G.vanderLinden@student.utwente.nl (Timothy van der Linden), KellySt@aol.com, kgstar@most.fw.hac.com, stevev@efn.org, jim@bogie2.bio.purdue.edu, zkulpa@zmit1.ippt.gov.pl, hous0042@maroon.tc.umn.edu, rddesign@wolfenet.com, David@InterWorld.com, lparker@destin.gulfnet.com, bmansur@oc.edu
At 11:18 AM 3/12/96, Steve VanDevender wrote:
>Timothy van der Linden writes:
> > > > Why doesn't the magnetic field in the ferrite core degrade? (I
>assume the
> > > > ferrite has some resistance.)
> > >
> > >Have you ever known other magnets to degrade? Once magnetized, a
> > >material won't demagnetize unless exposed to heat above its Curie point
> > >or another sufficiently strong magnetic field.
> >
> > Oh, now I understand, you create a permanent magnetic field just like
> > magnetic discs and tapes. (I though you created a current in the core) So in
> > fact the cores don't need to be closed completely.
> >
> > Tim
>
>The core is in essence just a lump of magnetizable material; they were
>generally made toroidal because it was easiest to string them that way.
>
>There were some designs for magnetic memory that didn't use cores, but
>(if I recall correctly) used spots of magnetic material sandwiched
>between two layers of parallel conductors. And even more exotic memory
>hardware has existed -- ever heard of mecury delay lines? Williams
>tubes?
Magnetic bubbles?
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Kelly Starks Internet: kgstar@most.fw.hac.com
Sr. Systems Engineer
Magnavox Electronic Systems Company
(Magnavox URL: http://www.fw.hac.com/external.html)
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