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  Interrupt:   0Ch
 
  Title:       Primary Communications Port (COM1:)
 
  See also:    Secondary Communications Port, COM Port Interrupt
 
  Description:                                            [PC] [AT] [PS/2]
 
     Invoked when pulse is detected on hardware interrupt line IRQ4
     (Interrupt Request 4), signalling data received at COM1 serial
     port.
 
     This interrupt should not be called directly. Default service is
     interrupt return (IRET). To trap Int 0Ch calls, a program must set
     up a handler routine to gain control when the interrupt occurs.
 
     Input     Output
 
     None      None
                                    -♦-