Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Reverse-engineering precision op amps from a 1969 analog computer
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We are restoring a vintage 1 computer that CuriousMarc recently obtained. Analog computers were formerly popular for fast scientific compu...
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Risky line printer music on a vintage IBM mainframe
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At the Computer History Museum , we recently obtained card decks for a 50-year-old computer music program. Back then, most computers didn...
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Reliable after 50 years: The Apollo Guidance Computer's switching power supplies
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We recently restored an Apollo Guidance Computer, the revolutionary computer that helped navigate to the Moon and land on its surface. 1 At...
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Looking inside a 1970s PROM chip that stores data in microscopic fuses
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The MMI 5300 was a memory chip from the early 1970s, storing 1024 bits in tiny fuses. 1 Unlike regular RAM chips, this was a PROM ( Progra...
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