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_8087

   Each time a program begins execution, a determination is made as to
   whether an 8087 family co-processor is present. If it is, all floating
   point calculations are performed using it. If not, all floating point
   calculations are performed by software emulation. The _8087 global
   variable defined in the compiler runtime module can be tested to see if a
   coprocessor is present. Possible values are:


       0--No coprocessor present
       1--8087 present
       2--80287 present
       3--80387 present

   This is useful for code that must account for the differences between
   coprocessors, or that could take advantage of the new instructions of the
   80387. The behavior of the Zortech libraries is also controlled by this
   flag.