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Load coprocessor emulation support.
The system unit.
The emu387 unit was written by Pierre Mueller for dos. It sets up the coprocessor emulation for FPC under dos. It is not necessary to use this unit on other OS platforms because they either simply do not run on a machine without coprocessor, or they provide the coprocessor emulation themselves.
It shouldn't be necessary to use the function in this unit, it should be enough to place this unit in the uses clause of your program to enable the coprocessor emulation under dos. The unit initialization code will try and load the coprocessor emulation code and initialize it.