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  Interrupt:   28h
 
  Title:       DOS Idle Interrupt
 
  See also:    Terminate and Stay Resident
 
  Description:
 
     Signals that DOS is in an idle state and may be interrupted provided
     the following functions are not called:
 
     01h-0Ch  [All versions]
     50h-51h  [Version 2.0+]
     59h      [Version 3.0+]
 
     Serviced by DOS with an interrupt return (IRET). To gain control
     when DOS is idle, a program must set up a handler routine for
     Int 28h.
 
     Input     Output
 
     None      None
                                    -♦-