Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Bad relay: Fixing the card reader for a vintage IBM 1401 mainframe
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As soon as we finished repairing a printer failure at the Computer History Museum , Murphy's law struck and the card reader started mal...
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The printer that wouldn't print: Fixing an IBM 1401 mainframe from the 1960s
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The Computer History Museum has two operational IBM 1401 computers used for demos , but a few weeks ago one computer suddenly couldn't ...
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Glowing mercury thyratrons: inside a 1940s Teletype switching power supply
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We recently started restoring a Teletype Model 19, a Navy communication system introduced in the 1940s. 14 This Teletype was powered by a b...
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