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     Int 07h is also invoked when the MP (Math Present) bit is set in
     Control Register 0 and the processor executes a WAIT or
     floating-point instruction after switching tasks.
 
     This interrupt allows the programmer to use floating-point
     instructions in an application without having to code tests for
     the presence of a coprocessor. If a coprocessor is present at
     run time, it receives instructions normally since the EM bit is
     clear. Otherwise, each floating-point instruction triggers Int
     07h, giving control to the application's interrupt handler. The
     handler can then emulate the instruction.
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