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Re: altermagnetism


 

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It may have been primitive, but it was exceptionally reliable - used in many spacecraft and rockets and their payloads - Pioneers 10 and 11 and Saturn V come to mind.

Magnetic bubbles are completely different technology.

Donald.

On 12/17/24 07:15, wn4isx via groups.io wrote:

I just threw away a 1k (1024) magnetic core plane driven by TTL. It dated from 1968. The college of engineering was tossing it in 1976 and I thought it might be useful. Wired it to a KIM-2.? It worked by what a headache
The Chyron (TV charater generator) at the university medica center had 5 core planes, stacked, they were 2 feet by 2 feet and 3k each for a total of 9k.
The 8" floppy drive was so stupid if the system issued a command change from track 20 to track 21 it backed the haed all the way back to track zero then stepped forward 21 tracks. sounded like a supressed maching gun. We replaced it with a dumb PC [original 5 slot IBM PC] with a 5meg hard file and the production people were so happy they wanted to have it's babies.
Somewhere i have several 4" squares I cut from one of the magnetic planes.
Core plane worked amazing well given how primative it was.
I hope it's not coming back.
We had a demonstration of TI's magenetic bubble memory....that crashed everytime the engineer tried ti rurn the program.
Magnets belong in compasses and children's toys,not computer memory!

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