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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:  <bios.h>
 
  Syntax:   unsigned _bios_serialcom( unsigned service,
                                      unsigned serial_port,
                                      unsigned data );
 
            service: _COM_INIT, _COM_SEND, _COM_RECEIVE, _COM_STATUS,
            data:    _COM_CHR7, _COM_CHR8, _COM_STOP1, _COM_STOP2,
                     _COM_NOPARITY, _COM_EVENPARITY, _COM_ODDPARITY,
                     _COM_110, _COM_150, _COM_300, _COM_600, _COM_1200,
                     _COM_2400, _COM_4800, _COM_9600
                     (may be joined with |)
 
  Returns:  a 16-bit status byte and other service-dependent
            information.
                                    -♦-