iron = I = iron box

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.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

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