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// license:BSD-3-Clause
// copyright-holders:Sergey Svishchev
/*********************************************************************
formats/aim_dsk.h
AIM disk images
References:
- http://www.torlus.com/floppy/forum/viewtopic.php?f=19&t=1385
- http://agatcomp.ru/Soft/agat.shtml
*********************************************************************/
#include <cassert>
#include "aim_dsk.h"
aim_format::aim_format()
{
}
const char *aim_format::name() const
{
return "aim";
}
const char *aim_format::description() const
{
return "AIM disk image";
}
const char *aim_format::extensions() const
{
return "aim";
}
int aim_format::identify(io_generic *io, uint32_t form_factor)
{
if (io_generic_size(io) == 2068480)
{
return 100;
}
return 0;
}
bool aim_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
{
image->set_variant(floppy_image::DSQD);
const int tracks = 80;
const int track_size = 6464 * 2;
const int heads = 2;
for (int track = 0; track < tracks; track++)
{
for (int head = 0; head < heads; head++)
{
std::vector<uint8_t> track_data(track_size);
std::vector<uint32_t> raw_track_data;
int data_count = 0;
int splice_pos = -1;
bool header = false;
// Read track
io_generic_read(io, &track_data[0], ( heads * track + head ) * track_size, track_size);
// Find first sector header or index mark
for (int offset = 0; offset < track_size; offset += 2)
{
if (track_data[offset + 1] == 1 && splice_pos < 0)
{
splice_pos = offset - (20 * 2);
}
if (track_data[offset + 1] == 3)
{
splice_pos = offset;
}
}
if (splice_pos < 0)
{
splice_pos = 0;
}
for (int offset = splice_pos; offset < track_size + splice_pos; offset += 2)
{
switch (track_data[(offset + 1) % track_size])
{
case 0: // regular data
if (data_count == 0)
header = (track_data[offset % track_size] == 0x95) ? true : false;
data_count++;
mfm_w(raw_track_data, 8, track_data[offset % track_size]);
break;
case 1: // sync mark
if (header && data_count < 11) // XXX hack
{
for (; data_count < 12; data_count++)
{
mfm_w(raw_track_data, 8, 0xaa);
}
}
raw_w(raw_track_data, 16, 0x8924);
raw_w(raw_track_data, 16, 0x5555);
data_count = 0;
// TELETEXT.AIM and others
case 0xff:
break;
default:
break;
}
}
generate_track_from_levels(track, head, raw_track_data, 0, image);
}
}
return true;
}
const floppy_format_type FLOPPY_AIM_FORMAT = &floppy_image_format_creator<aim_format>;
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