Cyrix 8087 floating-point unit family
We couldn't find any official information about Cyrix 8087 FPU. Even unconfirmed information is very scarce about this chip. Cyrix started selling 8087 co-processors sometime in 1987 - 1988, 7 - 8 years after it was released by Intel. It is possible that Cyrix also produced 80C87 - CMOS version of 8087. Because it is impossible to find any Cyrix 8087 chips now, we estimate that not many co-processors were produced.
Information below was provided to us by John Bond: