Cyrix FasMath For 286

Historia

This 80287-compatible chip was developed from the Cyrix 83D87 and has been available since 1991. It complies completely with the IEEE-754 standard for floating-point arithmetic and features nearly total compatibility with Intels coprocessors, including implementation of the full Intel 80387 instruction set. It implements the transcendental functions with the same degree of accuracy and the superior speed of the Cyrix 83D87. This makes the Cyrix 82S87 the fastest and most accurate 287 compatible coprocessor available. Documentation by Cyrix rates the 82S87 at 730 kWhets/sec for a 12.5 MHz system, while the Intel 287XL performs only 552 kWhets/sec. 82S87 chips manufactured after 1991 use the internals of the Cyrix 387+, which succeeds the original 83D87.