Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 14h Function 03h
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  Interrupt:   14h     Function:   03h
 
  Title:       Get Communications Port Status
 
  Description:                                          [PC] [AT] [PS/2]
 
     Returns the status of the specified serial communications port.
 
     Input                               Output
 
     AH = 03h                            AH = Port status
     DX = Communications port number          See: Int 14h Function 00h
          (0 = COM1, 1 = COM2,...)       AL = Modem status
                                              See: Int 14h Function 00h
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