Ken Shirriff's blog

Computer history, restoring vintage computers, IC reverse engineering, and whatever

Iconic consoles of the IBM System/360 mainframes, 55 years old

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The IBM System/360 was a groundbreaking family of mainframe computers announced on April 7, 1964. Designing the System/360 was an extremely...
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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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