Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Energizing a vacuum-tube flip-flop module from a 1948 IBM system
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In 1948, IBM introduced the 604 Electronic Calculating Punch. This machine was a programmable calculator, about the size of a double refrige...
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Examining circuit boards from the Space Shuttle's I/O Processor
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The Space Shuttle's five 1 general-purpose computers played a critical role in each flight: controlling the engines, monitoring thousan...
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The adder at the heart of Intel's 8087 floating-point chip
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In 1980, Intel released the Intel 8087 floating-point coprocessor, a chip that could make math up to 100 times faster. As well as arithmetic...
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