#define FOSC    (6000000L)
  #define BAUD    (9600)
  #define NINEBITS    (0) // 0=eight  1=nine

  // Standard io
  void            init_uart(void);
  void            putch(char byte);
  char            getch(void);
  bit             kbhit(void);

  // Special controls
  void        sci_PutNinth(unsigned char);
  unsigned char   sci_GetNinth(void);
  unsigned char   sci_GetFERR(void);
  unsigned char   sci_CheckOERR(void);