Intel 80C187 FPU family

Intel 80C187 is a math co-processor for 80C186 microprocessor family. The 80C187 does not support 80C188 and NMOS 80186/80188 CPUs. The 80C187 operates very similar to the Intel 8087 - it monitors address and data buses, and processes only FP instructions (see 8087 page for more information). The co-processor has a way or reporting its state (busy or ready) to the CPU - as a result WAIT (FWAIT) instruction is not required to perform synhcronization between the CPU and the FPU.

The 80C187 executes all 8087 floating-point instructions. In addition to these instructions the 80C187 includes 10 new instructions: Unordered compare, partial remainder and rounding, and transcedental instructions. Execution time of individual FP instructions on 80C187 is somewhat different from the 8087, but the average execution time is about the same.