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                               _8087

Each  time a program begins execution, a determination is made  as  to
whether  an  8087 or 80287 co-processor is present.  If  present,  all
floating  point calculations are performed using it. If  not  present,
all  floating point calculations are performed by software  emulation.
The _8087 global variable defined in c.asm, can be tested to see if an
8087/80287  is present. If the _8087 variable is equal to 0, there  is
no  8087  present. A value of 1 indicates that either an  8087  or  an
80287 has been found. A value of 3 means that an 80387 is present.