Intel 387 Math Coprocessor

In the late 1980s, Intel built a significant business selling math coprocessors, which provided floating-point math capabilities for the 286 and 386 microprocessors. Newer central processing units (CPUs) such as the 80486, Pentium, Xeon, and Itanium series have coprocessing capabilities built into the core processor, and as a consequence, Intel replaced their coprocessor market with the lucrative microprocessor upgrade business.