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/*
* flex_dsk.c - FLEX compatible disk images
*
* Created on: 24/06/2014
*/
#include "emu.h"
#include "flex_dsk.h"
flex_format::flex_format() : wd177x_format(formats)
{
}
const char *flex_format::name() const
{
return "flex";
}
const char *flex_format::description() const
{
return "FLEX compatible disk image";
}
const char *flex_format::extensions() const
{
return "dsk";
}
int flex_format::identify(io_generic *io, UINT32 form_factor)
{
io_generic_read(io, &info, 256 * 2, sizeof(struct sysinfo_sector));
if(((info.last_trk+1) * info.last_sec) * 256 == io_generic_size(io))
{
logerror("flex_dsk: %i tracks, %i sectors\n",info.last_trk+1,info.last_sec);
return 100;
}
return 0;
}
bool flex_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
{
int spt = info.last_sec;
int bps = 256;
int cell_count = (form_factor == floppy_image::FF_525) ? 50000 : 100000;
int offset = 0;
int head_num = 1;
int total_tracks = info.last_trk+1;
bool double_sided = false;
if(total_tracks == 40 && spt == 36)
double_sided = true;
if(total_tracks == 77 && spt == 30)
double_sided = true;
if(total_tracks == 80 && spt == 40) // 800kB
double_sided = true;
if(total_tracks == 80 && spt == 72) // 1.44MB
double_sided = true;
if(spt >= 20)
double_sided = true;
if(double_sided)
{
spt = spt / 2;
head_num = 2;
}
for(int track=0; track < total_tracks; track++)
for(int head=0;head < head_num;head++)
{
desc_pc_sector sects[80];
UINT8 sect_data[20000];
int sdatapos = 0;
for(int i=0; i<spt; i++)
{
sects[i].track = track;
sects[i].head = head; // no side select?
if(head == 0)
sects[i].sector = i+1;
else
sects[i].sector = i+1+spt;
sects[i].actual_size = bps;
sects[i].size = 1;
sects[i].deleted = false;
sects[i].bad_crc = false;
sects[i].data = §_data[sdatapos];
io_generic_read(io, sects[i].data, offset, bps);
offset += bps;
sdatapos += bps;
}
// gap sizes unverified
if(total_tracks == 35 && spt == 18 && (track >= 1 && track <= 2)) // handle Gimix Flex 3.6 disk image, which the boot sector loads tracks 1 and 2 as MFM
build_wd_track_mfm(track, head, image, cell_count*2, spt, sects, 50, 32, 22);
else
build_wd_track_fm(track, head, image, cell_count, spt, sects, 24, 16, 11);
}
return true;
}
const floppy_format_type FLOPPY_FLEX_FORMAT = &floppy_image_format_creator<flex_format>;
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