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Iron Age

Iron Age: n. In the history of computing, 1961--1971 --- the
   formative era of commercial mainframe technology, when
   ferrite-core dinosaurs ruled the earth.  The Iron Age began,
   ironically enough, with the delivery of the first minicomputer (the
   PDP-1) and ended with the introduction of the first commercial
   microprocessor (the Intel 4004) in 1971.  See also Stone Age;
   compare elder days.