The adder at the heart of Intel's 8087 floating-point chip
This article explores the technical architecture of the Intel 8087 floating-point coprocessor released in 1980. It specifically details how the chip's 69-bit adder functioned to accelerate complex mathematical calculations.
Why it matters
Understanding the history of chip architecture provides insight into the foundational engineering that enabled modern high-speed computing.
In 1980, Intel released the Intel 8087 floating-point coprocessor, a chip that could make math up to 100 times faster. As well as arithmetic and square roots, the 8087 computed transcendental functions including tangent, exponentiation, and logarithms. But it all depended on a 69-bit adder: "The arithmetic heart of the floating-point execution unit is centered about a nanomachine comprised of the adder and its related registers, shifters and control circuitry," as the patent describes it. In this article, I explain the circuitry of this adder.
The content is purely technical and historical, devoid of political or social bias.
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