An in-depth technical analysis of the Intel 8087 floating-point coprocessor, examining its microcode and datapath circuitry to explain how floating-point addition and subtraction are implemented at the silicon level. The article uses die microscopy to identify key components such as the integer adder, shifter, and special-value handling logic.
Background
The Intel 8087, introduced in 1980, was the first x86 floating-point coprocessor, dramatically accelerating math operations in early IBM PC systems. This article continues a series of chip-level teardowns that reverse-engineer historical processors.
- Source
- Lobsters
- Published
- Oct 19, 2026 at 01:59 AM
- Score
- 6.0 / 10