The emu387 unit was written by Pierre Müller 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.