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The #1 ESS telephone switch's processor used two types of memory. Ferrite sheets were used for read/write memory to store temporary data, in a manner similar to
by flyinghamster 7y ago
The #1 ESS telephone switch's processor used two types of memory. Ferrite sheets were used for read/write memory to store temporary data, in a manner similar to magnetic core memory, while twistor memory was used for rewritable but mostly read-only storage, to store the system programs.
https://en.wikipedia.org/wiki/Twistor_memory https://en.wikipedia.org/wiki/Twistor_memory
https://en.wikipedia.org/wiki/Number_One_Electronic_Switching_System https://en.wikipedia.org/wiki/Number_One_Electronic_Switchin...
- jcims 7y agoMy stepdad worked for AT&T back in the 70’s/80’s. He took us to his office one night and we saw an old ESS switch that had magnetic core memory. I just started programming at the time but remember it creeping me out for some reason. We also listened in on a random phone call and called a small restaurant in France to listen to the menu of the day.