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[MESS] ti99/geneve: Now accepts a variant of the disk format which has

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768 additional bytes at the end used as a bad sector map.
This commit is contained in:
Michael Zapf 2012-11-17 14:37:02 +00:00
parent 7fe45971e8
commit dbdc940411
1 changed files with 32 additions and 18 deletions
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50
src/lib/formats/ti99_dsk.c
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@ -12,6 +12,12 @@
* without track data. The first sector of the disk is located at the start of
* the image, while the last sector is at its end.
*
* There is also a variant of the SDF which adds three sectors at the end
* containing a map of bad sectors. This was introduced by a tool to read
* real TI floppy disks on a PC. As other emulators tolerate this additional
* bad sector map, we just check whether there are 3 more sectors and ignore
* them.
*
* The Track Dump Format is also known as pc99 (again, named after the first
* TI emulator to use this format). It is a contiguous sequence of track
* contents, containing all information including address marks and CRC, but it
@ -118,7 +124,7 @@ void ti99_set_80_track_drives(int use80)
use_80_track_drives = use80;
}
#define TI99_DSK_TAG "ti99dsktag"
#define TI99_DSK_TAG "ti99dsktag"
#define TI99DSK_BLOCKNOTFOUND -1
/*
@ -276,17 +282,17 @@ static int ti99_sdf_guess_geometry(floppy_image_legacy *floppy, UINT64 size,
int totsecs;
typedef struct ti99_vib
{
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,
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.)
} ti99_vib;
@ -339,6 +345,14 @@ static int ti99_sdf_guess_geometry(floppy_image_legacy *floppy, UINT64 size,
// and assume that the VIB did not contain reliable data. For the
// ambiguous case we choose the most common format.
// Adding support for another sector image format which adds 768 bytes
// as a bad sector map
if ((file_size / 256) % 10 == 3)
{
LOG_FORMATS("Stripping map of bad sectors at image end\n");
file_size -= 768;
}
switch (file_size)
{
case 1*40*9*256:
@ -809,7 +823,7 @@ static floperr_t ti99_sdf_get_offset(floppy_image_legacy *floppy, int head, int
{
*offset = (imgtrack * tag->sectors + sector) * SECTOR_SIZE;
}
else /* track numbers increasing towards outer track */
else /* track numbers increasing towards outer track */
{
*offset = (((2*tag->tracks)-1-imgtrack) * tag->sectors + sector) * SECTOR_SIZE;
}
@ -941,9 +955,9 @@ static FLOPPY_CONSTRUCT(ti99_sdf_construct)
{
/* create */
memset(&geometry, 0, sizeof(geometry));
geometry.sides = option_resolution_lookup_int(params, PARAM_HEADS);
geometry.tracksperside = option_resolution_lookup_int(params, PARAM_TRACKS);
geometry.secspertrack = option_resolution_lookup_int(params, PARAM_SECTORS);
geometry.sides = option_resolution_lookup_int(params, PARAM_HEADS);
geometry.tracksperside = option_resolution_lookup_int(params, PARAM_TRACKS);
geometry.secspertrack = option_resolution_lookup_int(params, PARAM_SECTORS);
/* We don't have headers for geometry */
/* check for usage in imgtool - we want to be able to create useful disks */
@ -2022,13 +2036,13 @@ static FLOPPY_CONSTRUCT(ti99_tdf_construct)
/* ----------------------------------------------------------------------- */
LEGACY_FLOPPY_OPTIONS_START( ti99 )
LEGACY_FLOPPY_OPTION( ti99_sdf, "dsk", "TI99 sector dump (v9t9)", ti99_sdf_identify, ti99_sdf_construct, NULL,
LEGACY_FLOPPY_OPTION( ti99_sdf, "dsk", "TI99 sector dump (v9t9)", ti99_sdf_identify, ti99_sdf_construct, NULL,
HEADS([1]-2)
TRACKS(35-[40]-80)
SECTORS(8/9/16/[18]/36)
SECTOR_LENGTH([256])
FIRST_SECTOR_ID(0))
LEGACY_FLOPPY_OPTION( ti99_tdf, "dsk,dtk", "TI99 track dump (pc99)", ti99_tdf_identify, ti99_tdf_construct, NULL,
LEGACY_FLOPPY_OPTION( ti99_tdf, "dsk,dtk", "TI99 track dump (pc99)", ti99_tdf_identify, ti99_tdf_construct, NULL,
TRACKS(35-[40]-80)
SECTORS(8/9/16/[18]/36)
SECTOR_LENGTH([256])