My 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 starte

My 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.