Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Reverse engineering the 76477 "Space Invaders" sound effect chip from die photos
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Remember the old video game Space Invaders? Some of its sound effects were provided by a chip called the 76477 Complex Sound Generation ch...
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1950's tax preparation: plugboard programming with an IBM 403 Accounting Machine
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Long before computers existed, businesses used electromechanical accounting machines for data processing. These one-ton accounting machines ...
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Inside the vintage 74181 ALU chip: how it works and why it's so strange
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The 74181 ALU (arithmetic/logic unit) chip powered many of the minicomputers of the 1970s: it provided fast 4-bit arithmetic and logic funct...
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