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  Constant:  _COM_INIT, _COM_SEND, _COM_RECEIVE, _COM_STATUS
 
  Include:   <bios.h>
 
  Context:   _bios_serialcom
 
  Synopsis:  The <service> argument can be set to one of the
             following constants:
 
     Constant         Service
 
     _COM_INIT        Sets the port to the parameters specified in the
                      data argument
 
     _COM_SEND        Transmits the data characters over the selected
                      serial port
 
     _COM_RECEIVE     Accepts an input character from the selected
                      serial port
 
     _COM_STATUS      Returns the current status of the selected serial
                      port