Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-23 17:00:53 +03:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

g64_dsk: Added bit cell size detection on save. (nw)

Browse Source
This commit is contained in:
Curt Coder 2014-02-13 22:48:20 +00:00
parent 21c0d4913c
commit d71e453b40
2 changed files with 24 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
src/lib/formats/g64_dsk.c
View File

@ -27,16 +27,6 @@ const UINT32 g64_format::c1541_cell_size[] =
3250 // 16MHz/13/4
};
const int g64_format::c1541_speed_zone[] =
{
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, // 1-17
2, 2, 2, 2, 2, 2, 2, // 18-24
1, 1, 1, 1, 1, 1, // 25-30
0, 0, 0, 0, 0, // 31-35
0, 0, 0, 0, 0, // 36-40
0, 0 // 41-42
};
int g64_format::identify(io_generic *io, UINT32 form_factor)
{
char h[8];
@ -91,12 +81,23 @@ bool g64_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
return true;
}
int g64_format::generate_bitstream(int track, int head, int speed_zone, UINT8 *trackbuf, int &track_size, floppy_image *image)
{
int cell_size = c1541_cell_size[speed_zone];
generate_bitstream_from_track(track, head, cell_size, trackbuf, track_size, image);
int actual_cell_size = 200000000L/track_size;
// allow a tolerance of +- 10 us (3990..4010 -> 4000)
return ((actual_cell_size >= cell_size-10) && (actual_cell_size <= cell_size+10)) ? speed_zone : -1;
}
bool g64_format::save(io_generic *io, floppy_image *image)
{
UINT8 header[4] = { 0x00, 0x54, 0xf8, 0x1e };
UINT8 header[] = { 'G', 'C', 'R', '-', '1', '5', '4', '1', 0x00, 0x54, TRACK_LENGTH & 0xff, TRACK_LENGTH >> 8 };
io_generic_write(io, G64_FORMAT_HEADER, SIGNATURE, sizeof(G64_FORMAT_HEADER));
io_generic_write(io, header, VERSION, 4);
io_generic_write(io, header, SIGNATURE, sizeof(header));
int head = 0;
int tracks_written = 0;
@ -112,14 +113,18 @@ bool g64_format::save(io_generic *io, floppy_image *image)
if (image->get_track_size(track, head) <= 1)
continue;
int speed_zone = c1541_speed_zone[track >> 1];
int cell_size = c1541_cell_size[speed_zone];
UINT8 *trackbuf = global_alloc_array(UINT8, TRACK_LENGTH-2);
int track_size;
int speed_zone;
generate_bitstream_from_track(track, head, cell_size, trackbuf, track_size, image);
// figure out the cell size and speed zone from the track data
if ((speed_zone = generate_bitstream(track, head, 3, trackbuf, track_size, image)) == -1)
if ((speed_zone = generate_bitstream(track, head, 2, trackbuf, track_size, image)) == -1)
if ((speed_zone = generate_bitstream(track, head, 1, trackbuf, track_size, image)) == -1)
if ((speed_zone = generate_bitstream(track, head, 0, trackbuf, track_size, image)) == -1)
throw emu_fatalerror("g64_format: Cannot determine speed zone for track %u", track);
LOG_FORMATS("track %u size %u cell %ld\n", track, track_size, 200000000L/track_size);
LOG_FORMATS("track %u size %u cell %u\n", track, track_size, c1541_cell_size[speed_zone]);
UINT8 track_offset[4];
UINT8 speed_offset[4];

3
src/lib/formats/g64_dsk.h
View File

@ -42,7 +42,8 @@ protected:
};
static const UINT32 c1541_cell_size[];
static const int c1541_speed_zone[];
int generate_bitstream(int track, int head, int speed_zone, UINT8 *trackbuf, int &track_size, floppy_image *image);
};
extern const floppy_format_type FLOPPY_G64_FORMAT;