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Motorola 68881
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.
== Overview ==
The 68020 and 68030 CPUs were designed with the separate 68881 chip in mind. Their instruction sets reserved the "F-line" instructions — that is, all opcodes beginning with the hexadecimal digit "F" could either be forwarded to an external coprocessor or be used as "traps" which would throw an exception, handing control to the computer's operating system. If an FPU is not present in the system, the OS would then either call an FPU emulator to execute the instruction's equivalent using 68020 integer-based software code, return an error to the program, terminate the program, or crash and require a reboot.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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