"The Motorola 68881 and Motorola 68882 were floating-point coprocessor (FPU) devices that were used in some computer systems in conjunction with the 68020 or 68030 microprocessors. The addition of one of these devices added substantial cost to the computer, but added a floating point unit that could rapidly perform floating point mathematical calculations. At the time, this feature was useful mostly for scientific and mathematical software."@en . . .