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???
05/07/07 22:02
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 		 #138795 - Faint recollections...
Responding to: ???'s previous message
I said:
Ferrite core memory is non-volatile

Jan Waclawek said:
Is it?

Now you've got me!
I was pretty sure that it was, but you have just dented my certainty...

I faintly recall something about it being much like dynamic memories and needing periodic refreshing...?

Actually, I think the thing is that a read is destructive - so you have to refresh-after-read if you want the data to remain...

Or something.



List of 26 messages in thread
TopicAuthorDate
non volatile 1bit ram            01/01/70 00:00      
   well, serial EEPROMs are dirt cheap            01/01/70 00:00      
   A non-volatile Flip-Flop?            01/01/70 00:00      
      2 bits - 74HC74+battery            01/01/70 00:00      
         waaaaaaay more costly than an EEPROM            01/01/70 00:00      
            yeah, but it's only 2 bits...            01/01/70 00:00      
               1 Ferrite Core?            01/01/70 00:00      
                  ferrite?            01/01/70 00:00      
                     Faint recollections...            01/01/70 00:00      
                        yeah, that's it, the read, not retention            01/01/70 00:00      
                        use a 10000uf capacitor!            01/01/70 00:00      
                        they have a "read only" command            01/01/70 00:00      
            Try a relay            01/01/70 00:00      
               Cost not a consideration...?            01/01/70 00:00      
               Bistable relay - cross reference            01/01/70 00:00      
      Ramtron Statesaver            01/01/70 00:00      
   Zero-power latching switch?            01/01/70 00:00      
   Some 805x MCU's have that feature            01/01/70 00:00      
      More Details            01/01/70 00:00      
         Explain            01/01/70 00:00      
            To andy            01/01/70 00:00      
               can it stay where it was when power went off?            01/01/70 00:00      
         Bi-stable Relay            01/01/70 00:00      
            Yes, that's the one - and available in India            01/01/70 00:00      
            polarized latching relay            01/01/70 00:00      
               Yes            01/01/70 00:00      

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