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  Interrupt:   15h     Function:   83h
 
  Title:       Event Wait
 
  See also:    Delay
 
  Description:                                               [AT] [PS/2]
 
     Requests setting of a semaphore after a specified interval or
     cancels a previous request.
 
     Input                          Output
 
     If requesting event wait        If called with AL = 00h
       AH = 83h                      and function successful
       AL = 00h                        Carry flag: clear
       CX:DX = Microseconds
       ES:BX = segment:offset of     If called with AL = 00h and
               semaphore byte        function unsuccessful (Event Wait
                                     already active)
     If canceling event wait           Carry flag: set
       AH = 83h
       AL = 01h                      If called with AL = 01h
                                       None
                                    -♦-