Ken Shirriff's blog

Computer history, restoring vintage computers, IC reverse engineering, and whatever

A 1970s disk drive that wouldn't seek: getting our Xerox Alto running again

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Our vintage Xerox Alto has been running reliably for months, but a couple weeks ago the disk drive malfunctioned and the heads stopped movin...
5 comments:

Reading a VGA monitor's configuration data with I2C and a PocketBeagle

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Have you ever wondered how your computer knows all the characteristics of your monitor— the supported resolutions, the model, and even the...
8 comments:

Implementing FizzBuzz on an FPGA

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I recently started FPGA programming and figured it would be fun to use an FPGA to implement the FizzBuzz algorithm. An FPGA ( Field-Progra...
12 comments:

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 ...
7 comments:
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