at the same clock speed as the main processor. Suffixes on the part number identified the clock speed: The part was second-sourced by AMD as AMD 8087 and by Cyrix as Cyrix 8087. The clone K1810WM87 of the 8087 was produced in the Soviet Union. Successors Just as the 8088 and 8086 processors were superseded by later parts, so was the 8087 superseded. Other Intel coprocessors were the 80287, 80387, and the 80187. Starting with the 80486, the later Intel processors did not use a separate floating-point coprocessor; virtually all included it on the main processor die, with the significant exception of the 80486SX, which was a modified 80486DX with the FPU disabled. The 80487 was in fact a full-blown 80486DX chip with an extra pin. When installed, it disabled the 80486SX CPU. The 80486DX, Pentium, and later processors include floating-point functionality on the CPU core. References Bibliography External links Intel 80x87 math coprocessors at cpu-collection.de Coprocessor.info: 8087 math coprocessor history information and pictures Datasheet for the Intel 8087 Math Coprocessor 80087 Floating point Coprocessors