typedef enum {OFF, ON} LOGIC;
typedef enum {TRUE, FALSE} BOOLEAN;

#define WORD unsigned short int
#define BYTE unsigned char

/* brug dem her : */

extern int Hopen_port( void );
extern int Hclose_port( void );

extern BOOLEAN Hsend_char( unsigned char tx_byte );
extern BOOLEAN Hget_byte( unsigned char *ch);

extern BOOLEAN Hsend_byte( char *next_ch, unsigned int count);

/* resten er lavniveau snask ... */

extern void far put_rx_byte( int com_no, char rx_byte );
static short far get_tx_byte( int com_no );

extern void Hreset_recv_buffer(void);
extern int Hsend_break(void);
extern int Hport_exists(int port);
extern int Hchk_line_status(void);
unsigned int Hxmit_isr_cnt( void );