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/*********************************************************************
formats/ti99_dsk.c
TI99 and Geneve disk images
Michael Zapf, Sept 2014
*********************************************************************/
#ifndef TI99_DSK_H
#define TI99_DSK_H
#include "flopimg.h"
#include "wd177x_dsk.h"
class ti99_floppy_format : public floppy_image_format_t
{
public:
bool supports_save() const { return true; }
bool load(io_generic *io, UINT32 form_factor, floppy_image *image);
bool save(io_generic *io, floppy_image *image);
protected:
int decode_bitstream(const UINT8 *bitstream, UINT8 *trackdata, int *sector, int cell_count, int encoding, UINT8 gapbytes, int track_size);
UINT8 get_data_from_encoding(UINT16 raw);
virtual int min_heads() =0;
virtual void determine_sizes(io_generic *io, int& cell_size, int& sector_count, int& heads) =0;
virtual int get_track_size(int cell_size, int sector_count) =0;
virtual void load_track(io_generic *io, UINT8 *trackdata, int head, int track, int sectorcount, int trackcount, int cellsize) =0;
virtual void write_track(io_generic *io, UINT8 *trackdata, int *sector, int track, int head, int maxsect, int maxtrack, int numbytes) =0;
int get_encoding(int cell_size);
int get_track_size(int cell_size);
void generate_track_fm(int track, int head, int cell_size, UINT8* trackdata, floppy_image *image);
void generate_track_mfm(int track, int head, int cell_size, UINT8* trackdata, floppy_image *image);
bool check_for_address_marks(UINT8* trackdata, int encoding);
// Debugging
void showtrack(UINT8* trackdata, int length);
};
/*
Modern implementation of the sector dump format.
*/
class ti99_sdf_format : public ti99_floppy_format
{
public:
int identify(io_generic *io, UINT32 form_factor);
const char *name() const;
const char *description() const;
const char *extensions() const;
private:
void determine_sizes(io_generic *io, int& cell_size, int& sector_count, int& heads);
int get_track_size(int cell_size, int sector_count);
void write_track(io_generic *io, UINT8 *trackdata, int *sector, int track, int head, int maxsect, int maxtrack, int numbytes);
void load_track(io_generic *io, UINT8 *trackdata, int head, int track, int sectorcount, int trackcount, int cellsize);
// This format supports single-sided images
int min_heads() { return 1; }
struct ti99vib
{
char name[10]; // volume name (10 characters, pad with spaces)
UINT8 totsecsMSB; // disk length in sectors (big-endian) (usually 360, 720 or 1440)
UINT8 totsecsLSB;
UINT8 secspertrack; // sectors per track (usually 9 (FM) or 18 (MFM))
UINT8 id[3]; // String "DSK"
UINT8 protection; // 'P' if disk is protected, ' ' otherwise.
UINT8 tracksperside; // tracks per side (usually 40)
UINT8 sides; // sides (1 or 2)
UINT8 density; // 0,1 (FM) or 2,3,4 (MFM)
UINT8 res[36]; // Empty for traditional disks, or up to 3 directory pointers
UINT8 abm[200]; // allocation bitmap: a 1 for each sector in use (sector 0 is LSBit of byte 0,
// sector 7 is MSBit of byte 0, sector 8 is LSBit of byte 1, etc.)
};
};
extern const floppy_format_type FLOPPY_TI99_SDF_FORMAT;
/*
Modern implementation of the track dump format.
*/
class ti99_tdf_format : public ti99_floppy_format
{
public:
int identify(io_generic *io, UINT32 form_factor);
const char *name() const;
const char *description() const;
const char *extensions() const;
private:
void determine_sizes(io_generic *io, int& cell_size, int& sector_count, int& heads);
void load_track(io_generic *io, UINT8 *trackdata, int head, int track, int sectorcount, int trackcount, int cellsize);
void write_track(io_generic *io, UINT8 *trackdata, int *sector, int track, int head, int maxsect, int maxtrack, int numbytes);
int get_track_size(int cell_size, int sector_count);
// This format only supports double-sided images
int min_heads() { return 2; }
};
extern const floppy_format_type FLOPPY_TI99_TDF_FORMAT;
// ========================================================================
/*
Legacy implementation.
*/
LEGACY_FLOPPY_OPTIONS_EXTERN(ti99);
void ti99_set_80_track_drives(int use80);
#endif /* TI99_DSK_H */
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