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// license:BSD-3-Clause
// copyright-holders:Fabio Priuli
/*********************************************************************
formats/dip_dsk.h
PC98 DIP disk images
0x100 header, followed by track data
TODO:
- Investigate header structure
- can this format be used to support different disc types?
*********************************************************************/
#include <assert.h>
#include "dip_dsk.h"
dip_format::dip_format()
{
}
const char *dip_format::name() const
{
return "dip";
}
const char *dip_format::description() const
{
return "DIP disk image";
}
const char *dip_format::extensions() const
{
return "dip";
}
int dip_format::identify(io_generic *io, UINT32 form_factor)
{
UINT64 size = io_generic_size(io);
if (size == 0x134000 + 0x100)
return 100;
return 0;
}
bool dip_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
{
int heads, tracks, spt, bps;
//For the moment we only support this disk structure...
//2 sides, 77 tracks, 8 sectors/track, 1024 bytes/sector = 1261568 bytes (360rpm)
heads = 2;
tracks = 77;
spt = 8;
bps = 1024;
int cell_count = form_factor == floppy_image::FF_35 ? 200000 : 166666;
int ssize;
for (ssize = 0; (128 << ssize) < bps; ssize++) {};
desc_pc_sector sects[256];
UINT8 sect_data[65536];
for (int track = 0; track < tracks; track++)
for (int head = 0; head < heads; head++)
{
io_generic_read(io, sect_data, 0x100 + bps * spt * (track * heads + head), bps * spt);
for (int i = 0; i < spt; i++)
{
sects[i].track = track;
sects[i].head = head;
sects[i].sector = i + 1;
sects[i].size = ssize;
sects[i].actual_size = bps;
sects[i].deleted = false;
sects[i].bad_crc = false;
sects[i].data = sect_data + i * bps;
}
build_pc_track_mfm(track, head, image, cell_count, spt, sects, calc_default_pc_gap3_size(form_factor, bps));
}
return true;
}
bool dip_format::supports_save() const
{
return false;
}
const floppy_format_type FLOPPY_DIP_FORMAT = &floppy_image_format_creator<dip_format>;
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