4 ms·
I've heard about program store sheets in the Bell System early electronic computers, but I'm not sure how they compare to this. Never have found a good explanat
by myself248 7y ago
I've heard about program store sheets in the Bell System early electronic computers, but I'm not sure how they compare to this. Never have found a good explanation of how they worked, just a few of my older colleagues described a stack of "memory sheets" they'd swap when it was time to change the computer's programming.
- flyinghamster 7y agoThe #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.