Ken Shirriff's blog
Computer history, restoring vintage computers, IC reverse engineering, and whatever
Repairing the card reader for a 1960s mainframe: cams, relays and a clutch
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I recently helped repair the card reader for the Computer History Museum's vintage IBM 1401 mainframe. In the process, I learned a lot ...
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IBM mainframe tube module part II: Powering up and using a 1950s key debouncer
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In the 1950s, before integrated circuits or even transistors, mainframe computers were built from thousands of power-hungry vacuum tubes fil...
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Xerox Alto's 3 Mb/s Ethernet: Building a gateway with a BeagleBone
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The Alto was a revolutionary computer designed at Xerox PARC in 1973. It introduced the GUI, high-resolution bitmapped displays, the optic...
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