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The first computer I worked on was a Phillips DS 714 Telegraph switch in 1973. CP Telecoms national switch for Canada. All discrete transisitors. It had a mag drum storage capacity of 1024 bytes, lol. The drum weighed 600 pounds, took it 30 mins to spin down for cleaning. All that was necessary was a bottle of alcohol and a rag, after all the heads were physically removed, lol.
Now that is something I have never seen. Good God! Only 1024!