Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 07h
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  Interrupt:   07h
 
  Title:       Processor Extension Not Available
 
  Description:                                                    [186+]
 
     Invoked when the 80x86 processor encounters a coprocessor
     instruction while EM (Emulate Math) bit is set in Control Register
     0. This indicates that the coprocessor is not present.
 
     This interrupt should not be called directly. Default service is
     interrupt return (IRET). To trap Int 07h calls, a program must set
     up a handler routine to gain control when the interrupt occurs.
 
     Input     Output
 
     None      None
                                    -♦-