Ken Shirriff's Blog
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Computer history, restoring vintage computers, IC reverse engineering, and whatever

Microcode in Intel's 8087 floating-point chip: the scale instruction

Ken Shirriff's BlogHN30 min read
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Cores in space: The core memory module from a 1980 Spacelab computer

Ken Shirriff's BlogHNCovered by320 min read
Ken Shirriff's Blog
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Energizing a vacuum-tube flip-flop module from a 1948 IBM system

Ken Shirriff's BlogHN2Covered by210 min read
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Examining circuit boards from the Space Shuttle's I/O Processor

Ken Shirriff's BlogHN20 min read
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The adder at the heart of Intel's 8087 floating-point chip

Ken Shirriff's BlogHNCovered by210 min read
Ken Shirriff's Blog
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Powering up a module from the IBM 604: an electronic calculator from 1948

Ken Shirriff's BlogHNCovered by69 min read
Ken Shirriff's Blog
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Microcode inside the Intel 8087 floating-point chip: register exchange

Ken Shirriff's BlogHN10 min read
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Reverse engineering circuitry in a Spacelab computer from 1980

Ken Shirriff's BlogHN20 min read
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The electromechanical angle computer inside the B-52 bomber's star tracker

Ken Shirriff's BlogHN20 min read
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The rise and fall of IBM's 4 Pi aerospace computers: an illustrated history

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Instruction decoding in the Intel 8087 floating-point chip

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Notes on the Intel 8086 processor's arithmetic-logic unit

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Here be dragons: Preventing static damage, latchup, and metastability in the 386

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Reverse engineering the 386 processor's prefetch queue circuitry

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

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Pi in the Pentium: reverse-engineering the constants in its floating-point unit

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Wealth distribution in the United States

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Reverse-engineering a three-axis attitude indicator from the F-4 fighter plane

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Inside a ferroelectric RAM chip

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The Pentium as a Navajo weaving

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