Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Op amp on the Moon: Reverse-engineering a hybrid op amp module
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I recently obtained a mysterious electronic component in a metal can, flatter and slightly larger than a typical integrated circuit. 1 Afte...
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Inside the Apollo Guidance Computer's core memory
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The Apollo Guidance Computer (AGC) provided guidance, navigation and control onboard the Apollo flights to the Moon. This historic computer ...
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Accounting machines, the IBM 1403, and why printers standardized on 132 columns
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Have you ever wondered why 132 characters is such a common width for printers? Many printers produced lines of 132 characters, such as the g...
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