Ken Shirriff's blog

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

A tricky Commodore PET repair: tracking down 6 1/2 bad chips

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mult3 In 1977, Commodore released the PET computer, a quirky home computer that combined the processor, a tiny keyboard, a cassette drive ...
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Notes on the Pentium's microcode circuitry

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Most people think of machine instructions as the fundamental steps that a computer performs. However, many processors have another layer of ...
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A USB interface to the "Mother of All Demos" keyset

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In the early 1960s, Douglas Engelbart started investigating how computers could augment human intelligence: "If, in your office, you a...
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The Pentium contains a complicated circuit to multiply by three

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This article is available in German at Heise Online . In 1993, Intel released the high-performance Pentium processor, the start of the long...
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