How scarce (valuable) is core for the PDP-8?

From: Hans Franke <Hans.Franke_at_mch20.sbs.de>
Date: Wed Apr 21 17:15:53 1999

> >Cores large enough for visual indication of magnetic field would be in the
> >10-20AMPS select curent range. Not a real possibility.

> How long does core stay magnetized without power?

> How many bytes of battery-backed RAM are there in a typical PC?

Is my Linux system typical (using 1 Meg static as boot :) ?

> Haven't there been contemporary memory devices that use nano-scale
> cores, to eliminate the battery needs and radiation sensitivity of RAM?

MRAM, based on the TMR effect - still in development, Universtity
of Kaiserslautern and SIEMENS Semiconductors (now renamed to Infineon)
cooperate in the development - Prototypes in the MBit scale are on
scedule for 2000/2001

Gruss
H.

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Received on Wed Apr 21 1999 - 17:15:53 BST

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