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:
My first contact with small ($5 mill capitalization) private company
named Cyrix in Dallas, TX in 1987, they were developing their first product
math co-processor clone of the Intel 8087 math co-processor. They were
the first company to clone the Intel 8087.
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