The adder at the heart of Intel's 8087 floating-point chip

Article excerpt

A reverse-engineering deep dive into the Intel 8087 floating-point coprocessor reveals how the chip's adder circuit actually worked at the transistor level. The analysis reconstructs the layout and logic of a critical component that handled floating-point arithmetic in 1980s-era computers, using high-resolution die photography to map out gate-level operations. The work illustrates both the ingenuity of vintage chip designers and the feasibility of understanding 40-year-old silicon through patient technical investigation.