Repairing a Nineteen Sixties mainframe: Fixing the IBM 1401’s core memory and power provide
A few weeks ago, I wanted to use one of the vintage IBM 1401 mainframe computers at the Computer History Museum, but the computer wasn’t working.1 This article describes the multi-week repair process to get the computer working again. The problem started when the machine was powered up at the same time someone shut down…

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