bool oric_dsk_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
{
UINT8 h[256];
UINT8 t[6250+3];
UINT32 stream[100000];
t[6250] = t[6251] = t[6252] = 0;
io_generic_read(io, h, 0, 256);
int sides = (h[11] << 24) | (h[10] << 16) | (h[ 9] << 8) | h[ 8];
int tracks = (h[15] << 24) | (h[14] << 16) | (h[13] << 8) | h[12];
for(int side=0; side<sides; side++)
for(int track=0; track<tracks; track++) {
io_generic_read(io, t, 256+6400*(tracks*side + track), 6250);
int pos = 0;
int sector_size = 128;
for(int i=0; i<6250; i++) {
if(t[i] == 0xc2 && t[i+1] == 0xc2 && t[i+2] == 0xc2) {
raw_w(stream, pos, 16, 0x5224);
raw_w(stream, pos, 16, 0x5224);
raw_w(stream, pos, 16, 0x5224);
i += 2;
continue;
}
if(t[i] == 0xa1 && t[i+1] == 0xa1 && t[i+2] == 0xa1) {
raw_w(stream, pos, 16, 0x4489);
raw_w(stream, pos, 16, 0x4489);
raw_w(stream, pos, 16, 0x4489);
int copy;
if(t[i+3] == 0xfe) {
copy = 7;
sector_size = 128 << (t[i+7] & 3);
logerror("%02x %x - %02x %02x %02x %02x\n",
track, side, t[i+4], t[i+5], t[i+6], t[i+7]);
} else if(t[i+3] == 0xfb)
copy = sector_size+3;
else
copy = 0;
for(int j=0; j<copy; j++)
mfm_w(stream, pos, 8, t[i+3+j]);
i += 2+copy;
continue;
}
mfm_w(stream, pos, 8, t[i]);
}
generate_track_from_levels(track, side, stream, 100000, 0, image);
}
return true;
}
bool dmk_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
{
const int header_size = 16;
UINT8 header[header_size];
io_generic_read(io, header, 0, header_size);
const int tracks = header[1];
const int track_size = ( header[3] << 8 ) | header[2];
const int heads = (header[4] & 0x10) ? 1 : 2;
const bool is_sd = (header[4] & 0x40) ? true : false;
const int raw_track_size = 2 * 8 * ( track_size - 0x80 );
if (is_sd)
{
if (heads == 2)
{
image->set_variant(floppy_image::DSSD);
}
else
{
image->set_variant(floppy_image::SSSD);
}
}
else
{
if (heads == 2)
{
image->set_variant(floppy_image::DSDD);
}
else
{
image->set_variant(floppy_image::SSDD);
}
}
for (int track = 0; track < tracks; track++)
{
for (int head = 0; head < heads; head++)
{
dynamic_array<UINT8> track_data(track_size);
dynamic_array<UINT32> raw_track_data(raw_track_size);
int iam_location = -1;
int idam_location[64];
int dam_location[64];
int tpos = 0;
// Read track
io_generic_read(io, track_data, header_size + ( heads * track + head ) * track_size, track_size);
for (int i = 0; i < 64; i++)
{
idam_location[i] = -1;
dam_location[i] = -1;
}
// Find IDAM locations
UINT16 track_header_offset = 0;
UINT16 track_offset = ( ( track_data[track_header_offset + 1] << 8 ) | track_data[track_header_offset] ) & 0x3fff;
track_header_offset += 2;
while ( track_offset != 0 && track_offset >= 0x83 && track_offset < track_size && track_header_offset < 0x80 )
{
// Assume 3 bytes before IDAM pointers are the start of IDAM indicators
idam_location[(track_header_offset/2) - 1] = track_offset - 3;
// Scan for DAM location
for (int i = track_offset + 53; i > track_offset + 10; i--)
{
if ((track_data[i] == 0xfb || track_data[i] == 0xf8) && track_data[i-1] == 0xa1 && track_data[i-2] == 0xa1)
{
dam_location[(track_header_offset/2) - 1] = i - 3;
break;
}
}
track_offset = ( ( track_data[track_header_offset + 1] << 8 ) | track_data[track_header_offset] ) & 0x3fff;
track_header_offset += 2;
};
// Find IAM location
for(int i = idam_location[0] - 1; i >= 3; i--)
{
// It's usually 3 bytes but several dumped tracks seem to contain only 2 bytes
if (track_data[i] == 0xfc && track_data[i-1] == 0xc2 && track_data[i-2] == 0xc2)
{
iam_location = i - 3;
break;
}
}
int idam_index = 0;
int dam_index = 0;
for (int offset = 0x80; offset < track_size; offset++)
{
if (offset == iam_location)
{
// Write IAM
raw_w(raw_track_data, tpos, 16, 0x5224);
raw_w(raw_track_data, tpos, 16, 0x5224);
raw_w(raw_track_data, tpos, 16, 0x5224);
offset += 3;
}
if (offset == idam_location[idam_index])
{
raw_w(raw_track_data, tpos, 16, 0x4489);
raw_w(raw_track_data, tpos, 16, 0x4489);
raw_w(raw_track_data, tpos, 16, 0x4489);
idam_index += 1;
offset += 3;
}
if (offset == dam_location[dam_index])
{
raw_w(raw_track_data, tpos, 16, 0x4489);
raw_w(raw_track_data, tpos, 16, 0x4489);
raw_w(raw_track_data, tpos, 16, 0x4489);
dam_index += 1;
offset += 3;
}
mfm_w(raw_track_data, tpos, 8, track_data[offset]);
}
generate_track_from_levels(track, head, raw_track_data, raw_track_size, 0, image);
}
}
return true;
}
bool d88_format::load(io_generic *io, UINT32 form_factor, floppy_image *image)
{
UINT8 h[32];
io_generic_read(io, h, 0, 32);
int cell_count = 0;
int track_count = 0;
int head_count = 0;
switch(h[0x1b]) {
case 0x00:
cell_count = 100000;
track_count = 42;
head_count = 2;
image->set_variant(floppy_image::DSDD);
break;
case 0x10:
cell_count = 100000;
track_count = 82;
head_count = 2;
image->set_variant(floppy_image::DSQD);
break;
case 0x20:
cell_count = form_factor == floppy_image::FF_35 ? 200000 : 166666;
track_count = 82;
head_count = 2;
image->set_variant(floppy_image::DSHD);
break;
case 0x30:
cell_count = 100000;
track_count = 42;
head_count = 1;
image->set_variant(floppy_image::SSDD);
break;
case 0x40:
cell_count = 100000;
track_count = 82;
head_count = 1;
image->set_variant(floppy_image::SSQD);
break;
}
if(!head_count)
return false;
UINT32 track_pos[164];
io_generic_read(io, track_pos, 32, 164*4);
for(int track=0; track < track_count; track++)
for(int head=0; head < head_count; head++) {
int pos = LITTLE_ENDIANIZE_INT32(track_pos[track * head_count + head]);
if(!pos)
continue;
UINT32 track_data[210000];
UINT8 sect_data[65536];
int tpos = 0;
// gap 4a , IAM and gap 1
for(int i=0; i<80; i++) mfm_w(track_data, tpos, 8, 0x4e);
for(int i=0; i<12; i++) mfm_w(track_data, tpos, 8, 0x00);
for(int i=0; i< 3; i++) raw_w(track_data, tpos, 16, 0x5224);
mfm_w(track_data, tpos, 8, 0xfc);
for(int i=0; i<50; i++) mfm_w(track_data, tpos, 8, 0x4e);
// Updated after reading the first header
int sector_count = 1;
int gap3 = 84;
for(int i=0; i<sector_count; i++) {
UINT8 hs[16];
io_generic_read(io, hs, pos, 16);
UINT16 size = LITTLE_ENDIANIZE_INT16(*(UINT16 *)(hs+14));
io_generic_read(io, sect_data, pos+16, size);
pos += 16+size;
if(i == 0) {
sector_count = LITTLE_ENDIANIZE_INT16(*(UINT16 *)(hs+4));
if(size < 512)
gap3 = form_factor == floppy_image::FF_35 ? 54 : 50;
else
gap3 = form_factor == floppy_image::FF_35 ? 84 : 80;
}
int cpos;
UINT16 crc;
// sync and IDAM and gap 2
for(int j=0; j<12; j++) mfm_w(track_data, tpos, 8, 0x00);
cpos = tpos;
for(int j=0; j< 3; j++) raw_w(track_data, tpos, 16, 0x4489);
mfm_w(track_data, tpos, 8, 0xfe);
mfm_w(track_data, tpos, 8, hs[0]);
mfm_w(track_data, tpos, 8, hs[1]);
mfm_w(track_data, tpos, 8, hs[2]);
mfm_w(track_data, tpos, 8, hs[3]);
crc = calc_crc_ccitt(track_data, cpos, tpos);
mfm_w(track_data, tpos, 16, crc);
for(int j=0; j<22; j++) mfm_w(track_data, tpos, 8, 0x4e);
// sync, DAM, data and gap 3
for(int j=0; j<12; j++) mfm_w(track_data, tpos, 8, 0x00);
cpos = tpos;
for(int j=0; j< 3; j++) raw_w(track_data, tpos, 16, 0x4489);
mfm_w(track_data, tpos, 8, 0xfb);
for(int j=0; j<size; j++) mfm_w(track_data, tpos, 8, sect_data[j]);
crc = calc_crc_ccitt(track_data, cpos, tpos);
mfm_w(track_data, tpos, 16, crc);
for(int j=0; j<gap3; j++) mfm_w(track_data, tpos, 8, 0x4e);
}
// Gap 4b
if(tpos > cell_count)
throw emu_fatalerror("d88_format: Incorrect layout on track %d head %d, expected_size=%d, current_size=%d", track, head, cell_count, tpos);
while(tpos < cell_count-15) mfm_w(track_data, tpos, 8, 0x4e);
raw_w(track_data, tpos, cell_count-tpos, 0x9254 >> (16+tpos-cell_count));
generate_track_from_levels(track, head, track_data, cell_count, 0, image);
}
return true;
}
