Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Reverse-engineering a vintage OR/NOR chip
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Recently, I received a die photo of a mystery integrated circuit, the OQ100, 1 from EvilMonkeyDesignz . I analyzed the die photo and foun...
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Reverse-engineering a vintage comparator chip
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I recently saw an interesting die photo of an unknown chip on Twitter , so I did some analysis of it. Looking at the circuitry inside, the...
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Teardown of a logic chip from a vintage IBM ES/9000 mainframe
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IBM and its large mainframe computers ruled the computer industry for decades. But during the 1980s, mainframes faced increasing competiti...
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Two dies in one package: Teardown of a vintage ROM with double the storage
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In 1971, semiconductor memory was still a new development so chips couldn't hold a lot of data. To double the storage capacity, IBM ...
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