void fdi_init();
void fdi_load(int drive, char *fn);
void fdi_close(int drive);
void fdi_seek(int drive, int track);
void fdi_readsector(int drive, int sector, int track, int side, int density, int sector_size);
void fdi_writesector(int drive, int sector, int track, int side, int density, int sector_size);
void fdi_readaddress(int drive, int sector, int side, int density);
void fdi_format(int drive, int sector, int side, int density, uint8_t fill);
int fdi_hole(int drive);
int fdi_byteperiod(int drive);
void fdi_stop(int drive);
int fdi_poll(int drive);
int fdi_realtrack(int track, int drive);