Ken Shirriff's blog

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

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

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In 1978, Intel introduced the 8086 processor, a revolutionary chip that led to the modern x86 architecture. Unlike modern 64-bit processors,...
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Conditions in the Intel 8087 floating-point chip's microcode

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In the 1980s, if you wanted your computer to do floating-point calculations faster, you could buy the Intel 8087 floating-point coprocessor ...

The stack circuitry of the Intel 8087 floating point chip, reverse-engineered

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Early microprocessors were very slow when operating with floating-point numbers. But in 1980, Intel introduced the 8087 floating-point copro...
5 comments:

Unusual circuits in the Intel 386's standard cell logic

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I've been studying the standard cell circuitry in the Intel 386 processor recently. The 386, introduced in 1985, was Intel's most co...
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