Re: altermagnetism
开云体育Your experiences sound a lot like mine. I too have a core memory sample but without I-O electronics. For a job, I bought two early 8” floppy drives @ $800 each in 1977.? That is $4,000 each in today’s money! The drives were bare.? I did my own floppy disc controller and operating system. The customer also requested a tape backup option too.? It was noisy punching the tape. Later I did a CRT display with my own driver and character generator. I have a hard drive monster; the platter is about 10 inches in diameter and 3/8” thick.? Yes, almost 10mm! It is amazing to think about the changes in 50 years! Bertho ? ? From: [email protected] <[email protected]> On Behalf Of wn4isx via groups.io
Sent: 17 December, 2024 7:16 To: [email protected] Subject: Re: [electronics101] altermagnetism ? 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! _._,_._,_ |
Bertho