2 Feb
2023
2 Feb
'23
4:09 p.m.
On 02/02/2023 10:03 AM CST Sellam Abraham via cctalk
<cctalk(a)classiccmp.org> wrote:
This discussion on core memory got me thinking:
Is it possible to "read" core memory by examining each core using some kind
of instrument that would sense its "charge" (or lack thereof)
non-destructively?
Could a piece of paper be placed over a core plane and fine particles of
iron sprinkled onto the paper to literally "see" the bits?
Please excuse me for any ignorant assumptions made here on my part.
Sellam
I suspect it would be possible, but not easy. The main reason I say that is that the
toroidal shape of the cores, rather than something like a square or straight bar, is
intended to keep the magnetic field contained within the ring. Instead of coming out an
end or edge and going through free space, the magnetic lines of force go circularly around
the loop. The polarity of the field determines whether it is clockwise or
counterclockwise. So very little field escapes. That's what makes it possible to
have them packed so tightly without interference.
https://en.wikipedia.org/wiki/Toroidal_inductors_and_transformers
Will