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Ken Shirriff

Interested in computer history and reverse engineering old chips. Currently restoring a Xerox Alto.

Some projects: Wrote the Arduino IRremote library for infrared remotes. Attempted Bitcoin mining on a 55 year old IBM punch card mainframe. Got six symbols added to Unicode including the Bitcoin symbol (₿).

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  • San Francisco Bay Area, CA, United States
  • righto.com
  • Member for 3 years, 10 months
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  • Last seen 14 hours ago

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25 Were people building CPUs out of TTL logic prior to the 4004, 8080 and the 6800? Jan 4 '19
21 Did the Apollo Guidance Computer really use 60% of the world's ICs in 1963? Aug 28 '19
9 Are there any articles elucidating the history of the POPCOUNT instruction? Jan 5 '19
5 Were there any commercially available graphical interfaces before the apple Lisa? Jan 5 '19

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