Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Hammer time: fixing the printer on a vintage IBM 1401 mainframe
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The Computer History Museum has two operational IBM 1401 computers used for demos but one of the printers stopped working a few weeks ago....
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Two bits per transistor: high-density ROM in Intel's 8087 floating point chip
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The 8087 chip provided fast floating point arithmetic for the original IBM PC and became part of the x86 architecture used today. One unusua...
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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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