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mame/src/lib/formats/z80ne_dsk.c

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/*********************************************************************
formats/z80ne_dsk.c
Nuova Elettronica Z80NE disk images
*********************************************************************/
#include <assert.h>
#include "z80ne_dsk.h"
#include "basicdsk.h"
#include "imageutl.h"
#include "coretmpl.h"
/* -----------------------------------------------------------------------
* DMK file format
*
* David M. Keil's disk image format is aptly called an 'on disk' image
* format. This means that whatever written to the disk is encoded into
* the image file. IDAMS, sector headers, trailing CRCs, and intra-sector
* spacing. *
*
* HEADER DESCRIPTION:
*
* Offset Bytes Field Description
* ------ ----- ------------ -----------
* 0 1 write_prot 0xff = Write Protected, 0x00 = R/W
* 1 1 tracks Number of tracks
* 2 2 track_length Bytes per track on DMK file (little endian)
* 4 1 disk_options Miscellaneous flags
* bit 0-3: Unused
* bit 4: Sides on DMK file
* 1=single, 0=double
* bit 5: Unused
* bit 6: Single Density DMK file
* 1=single (bytes written once
* on IDAMs)
* 0=double (bytes written
* two times for SD IDAMs)
* 5 7 reserved Reserved for future use
* 12 4 real_disk_code If this is 0x12345678 (little endian)
* then access a real disk drive
* (unsupported)
*
* Each track begins with a track TOC, consisting of 64 little endian 16-bit
* integers. Each integer has the following format:
* bit 0-13: Offset from beginning of track to 'FE' byte of IDAM
* Note these are always sorted from first to last. All empty
* entries are 0x00
* bit 14: Undefined (reserved)
* bit 15: Sector double density (0=SD 1=DD)
* If not set and SD DMK flag is set then bytes are written
* once.
* ----------------------------------------------------------------------- */
struct dmk_tag
{
int heads;
int tracks;
UINT32 track_size;
};
/* DMK file structure
* See WD1711 documentation
*/
/* DMK file header */
#define DMK_HEADER_LEN 16 /* DMK header */
/* For every track (40) */
#define DMK_TOC_LEN 128 /* 64 16-bit relative offsets to IDAMs */
#define DMK_GAP1_LEN 32 /* GAP1 (26 bytes 0xFF and 6 bytes 0x00) */
/* For every sector (10) 301 bytes */
#define DMK_IDAM_LEN 7 /* IDAM (0xFE, Track, 0x00, Sector, 0x00, CRChi, CRClo) */
#define DMK_ID_GAP_LEN 17 /* GAP2 (11 bytes 0xFF and 6 bytes 0x00) */
#define DMK_DAM_LEN 1 /* Data Address Mark (0xFB) */
#define DMK_DATA_LEN 256 /* Data */
#define DMK_DATA_CRC_LEN 2 /* Data CRC (CRChi, CRClo) */
#define DMK_DATA_GAP_LEN 18 /* GAP3 (12 bytes 0xFF and 6 bytes 0x00) (not for last sector) */
#define DMK_EXTRA_TRACK_LENGTH (176) /* GAP4 (192 bytes 0xFF) */
/* End of DMK file structure */
#define dmk_idam_type(x) (x)[0]
#define dmk_idam_track(x) (x)[1]
#define dmk_idam_side(x) (x)[2]
#define dmk_idam_sector(x) (x)[3]
#define dmk_idam_sectorlength(x) (x)[4]
#define dmk_idam_crc(x) (((x)[5] << 8) + (x)[6])
#define dmk_idam_set_crc(x, crc) (x)[5] = ((crc) >> 8); (x)[6] = ((crc) >> 0);
static const char needle_data[] = "\x00\x00\x00\x00\x00\x00\x00\x00\xFB\xFB";
static const char needle_deleted_data_fa[] = "\x00\x00\x00\x00\x00\x00\x00\x00\xFA\xFA";
static const char needle_deleted_data_f8[] = "\x00\x00\x00\x00\x00\x00\x00\x00\xF8\xF8";
static struct dmk_tag *get_dmk_tag(floppy_image_legacy *floppy)
{
return (dmk_tag *)floppy_tag(floppy);
}
static floperr_t z80ne_dmk_get_track_offset(floppy_image_legacy *floppy, int head, int track, UINT64 *offset)
{
struct dmk_tag *tag = get_dmk_tag(floppy);
if ((head < 0) || (head >= tag->heads) || (track < 0) || (track >= tag->tracks))
return FLOPPY_ERROR_SEEKERROR;
*offset = track;
*offset *= tag->heads;
*offset += head;
*offset *= tag->track_size;
*offset += DMK_HEADER_LEN;
return FLOPPY_ERROR_SUCCESS;
}
static UINT32 z80ne_dmk_min_track_size(int sectors, int sector_length)
{
int sector_physical_length;
sector_physical_length = (DMK_IDAM_LEN + DMK_ID_GAP_LEN + DMK_DAM_LEN + sector_length + DMK_DATA_CRC_LEN + DMK_DATA_GAP_LEN);
return DMK_TOC_LEN + 2 * (DMK_GAP1_LEN + (sectors * sector_physical_length) - DMK_DATA_GAP_LEN + DMK_EXTRA_TRACK_LENGTH);
}
static floperr_t z80ne_dmk_read_track(floppy_image_legacy *floppy, int head, int track, UINT64 offset, void *buffer, size_t buflen)
{
floperr_t err;
UINT64 track_offset;
err = z80ne_dmk_get_track_offset(floppy, head, track, &track_offset);
if (err)
return err;
floppy_image_read(floppy, buffer, offset + track_offset, buflen);
return FLOPPY_ERROR_SUCCESS;
}
static floperr_t z80ne_dmk_write_track(floppy_image_legacy *floppy, int head, int track, UINT64 offset, const void *buffer, size_t buflen)
{
floperr_t err;
UINT64 track_offset;
err = z80ne_dmk_get_track_offset(floppy, head, track, &track_offset);
if (err)
return err;
floppy_image_write(floppy, buffer, offset + track_offset, buflen);
return FLOPPY_ERROR_SUCCESS;
}
static floperr_t z80ne_dmk_get_track_data_offset(floppy_image_legacy *floppy, int head, int track, UINT64 *offset)
{
*offset = DMK_TOC_LEN + 1;
return FLOPPY_ERROR_SUCCESS;
}
static floperr_t z80ne_dmk_format_track(floppy_image_legacy *floppy, int head, int track, option_resolution *params)
{
int sectors;
int sector_length;
int interleave;
int first_sector_id;
floperr_t err;
int physical_sector;
int logical_sector;
int track_position;
UINT16 idam_offset;
UINT16 crc;
UINT8 *track_data;
void *track_data_v;
UINT32 max_track_size;
dynamic_array<int> sector_map;
dynamic_buffer local_sector;
int local_sector_size;
int sector_position;
int i;
sectors = option_resolution_lookup_int(params, PARAM_SECTORS);
sector_length = option_resolution_lookup_int(params, PARAM_SECTOR_LENGTH);
interleave = option_resolution_lookup_int(params, PARAM_INTERLEAVE);
first_sector_id = option_resolution_lookup_int(params, PARAM_FIRST_SECTOR_ID);
max_track_size = get_dmk_tag(floppy)->track_size;
if (sectors > DMK_TOC_LEN/2)
{
err = FLOPPY_ERROR_INTERNAL;
goto done;
}
if (max_track_size < z80ne_dmk_min_track_size(sectors, sector_length))
{
err = FLOPPY_ERROR_NOSPACE;
goto done;
}
err = floppy_load_track(floppy, head, track, TRUE, &track_data_v, NULL);
if (err)
goto done;
track_data = (UINT8 *) track_data_v;
/* set up sector map */
sector_map.resize_and_clear(sectors, 0xFF);
physical_sector = 0;
for (logical_sector = 0; logical_sector < sectors; logical_sector++)
{
while(sector_map[physical_sector] >= 0)
{
physical_sector++;
physical_sector %= sectors;
}
sector_map[physical_sector] = logical_sector + first_sector_id;
physical_sector += interleave + 1;
physical_sector %= sectors;
}
/* set up a local physical sector template */
local_sector_size = (DMK_IDAM_LEN +
DMK_ID_GAP_LEN +
DMK_DAM_LEN +
sector_length +
DMK_DATA_CRC_LEN +
DMK_DATA_GAP_LEN);
local_sector.resize_and_clear(local_sector_size);
/* set up track table of contents */
physical_sector = 0;
/* write GAP1 (track lead in) */
memset(&track_data[DMK_TOC_LEN], 0xFF, 52);
memset(&track_data[DMK_TOC_LEN+52], 0x00, 12);
track_position = DMK_TOC_LEN + DMK_GAP1_LEN * 2;
/*
* prepare template in local sector
*/
/* IDAM */
sector_position = 0;
dmk_idam_type( &local_sector[sector_position]) = 0xFE;
dmk_idam_track( &local_sector[sector_position]) = track;
dmk_idam_side( &local_sector[sector_position]) = head;
dmk_idam_sector( &local_sector[sector_position]) = 0; /* replace in sector instances */
dmk_idam_sectorlength( &local_sector[sector_position]) = compute_log2(sector_length / 128);
dmk_idam_set_crc( &local_sector[sector_position], 0); /* replace in sector instances */
sector_position += 7;
/* GAP2 (ID GAP) */
memset(&local_sector[sector_position], 0xFF, 11);
sector_position += 11;
memset(&local_sector[sector_position], 0x00, 6);
sector_position += 6;
/* sector body */
local_sector[sector_position] = 0xFB;
memset(&local_sector[sector_position + 1], floppy_get_filler(floppy), sector_length);
crc = ccitt_crc16(0xffff, &local_sector[sector_position], sector_length + 1);
local_sector[sector_position + sector_length + 1] = (UINT8) (crc >> 8);
local_sector[sector_position + sector_length + 2] = (UINT8) (crc >> 0);
sector_position += sector_length + 3;
/* GAP3 (Data GAP) */
memset(&local_sector[sector_position], 0xFF, 12);
sector_position += 12;
memset(&local_sector[sector_position], 0x00, 6);
sector_position += 6;
/*
* start of track data
*/
while(physical_sector < DMK_TOC_LEN/2)
{
if (physical_sector >= sectors)
{
/* no more sectors */
idam_offset = 0;
}
else
{
/* this is a sector */
idam_offset = track_position;
logical_sector = sector_map[physical_sector];
/* update IDAM in local sector template */
dmk_idam_sector( &local_sector[0]) = logical_sector; /* update sector number in sector instance */
crc = ccitt_crc16(0xffff, &local_sector[0], DMK_IDAM_LEN - 2); /* and recalculate crc */
dmk_idam_set_crc( &local_sector[0], crc);
/* write local sector in track doubling every byte (DMK double density mode) */
for(i=0; i<local_sector_size; i++)
track_data[track_position + i*2] = track_data[track_position + (i*2) + 1] = local_sector[i];
track_position += (2 * local_sector_size);
if (physical_sector == (sectors-1)) /* on last sector remove GAP3 */
track_position -= (2 * DMK_DATA_GAP_LEN);
}
/* write the TOC entry */
track_data[physical_sector * 2 + 0] = (UINT8) (idam_offset >> 0);
track_data[physical_sector * 2 + 1] = (UINT8) (idam_offset >> 8);
physical_sector++;
}
/* write track footer GAP4 */
assert(max_track_size >= (UINT32)track_position);
memset(&track_data[track_position], 0xFF, max_track_size - track_position);
done:
return err;
}
static int z80ne_dmk_get_heads_per_disk(floppy_image_legacy *floppy)
{
return get_dmk_tag(floppy)->heads;
}
static int z80ne_dmk_get_tracks_per_disk(floppy_image_legacy *floppy)
{
return get_dmk_tag(floppy)->tracks;
}
static UINT32 z80ne_dmk_get_track_size(floppy_image_legacy *floppy, int head, int track)
{
return get_dmk_tag(floppy)->track_size;
}
static UINT8 * my_memmem(UINT8 *haystack, size_t haystacklen,
UINT8 *needle, size_t needlelen)
{
register UINT8 *h = haystack;
register UINT8 *n = needle;
register size_t hl = haystacklen;
register size_t nl = needlelen;
register size_t i;
if (nl == 0) return haystack; /* The first occurrence of the empty string is deemed to occur at
the beginning of the string. */
if (hl < nl)
return NULL;
for( i = 0; (i < hl) && (i + nl <= hl ); i++ )
if (h[i] == *n) /* first match */
if ( !memcmp(&h[i]+1, n + 1, nl - 1) )
return (haystack+i); /* returns a pointer to the substring */
return (UINT8 *)NULL; /* not found */
}
static floperr_t z80ne_dmk_seek_sector_in_track(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, int dirtify, UINT8 **sector_data, UINT32 *sector_length)
{
struct dmk_tag *tag = get_dmk_tag(floppy);
floperr_t err;
size_t idam_offset = 0;
UINT16 calculated_crc;
size_t i, j;
size_t offs;
/*int state;*/
UINT8 *track_data;
void *track_data_v;
size_t track_length;
size_t sec_len;
dynamic_buffer local_idam;
int local_idam_size;
UINT8 *sec_data;
err = floppy_load_track(floppy, head, track, dirtify, &track_data_v, &track_length);
if (err)
goto done;
track_data = (UINT8 *) track_data_v;
/* set up a local IDAM space */
local_idam_size = (DMK_IDAM_LEN +
DMK_ID_GAP_LEN +
DMK_DAM_LEN +
DMK_DATA_GAP_LEN);
local_idam.resize_and_clear(local_idam_size);
/* search for matching IDAM */
for (i = 0; i < DMK_TOC_LEN / 2; i++)
{
idam_offset = track_data[i * 2 + 1];
idam_offset <<= 8;
idam_offset |= track_data[i * 2 + 0];
idam_offset &= 0x3FFF;
if (idam_offset == 0)
{
/* we've reached the end of the road */
i = DMK_TOC_LEN;
break;
}
if ((idam_offset + DMK_IDAM_LEN * 2) >= tag->track_size)
continue;
/* overflowing the track? */
if ((idam_offset + local_idam_size * 2) >= tag->track_size)
{
err = FLOPPY_ERROR_SEEKERROR;
goto done;
}
/* create a local copy of sector of IDAM */
for(j = 0; j < (DMK_IDAM_LEN + DMK_ID_GAP_LEN + DMK_DAM_LEN); j++)
local_idam[j] = track_data[idam_offset + j*2];
/* from now on all operations are done in local copy of IDAM */
calculated_crc = ccitt_crc16(0xffff, &local_idam[0], DMK_IDAM_LEN - 2);
/* check IDAM integrity and check for matching sector */
if (calculated_crc == dmk_idam_crc(&local_idam[0]))
{
if (sector_is_index)
{
/* the sector is indexed; decrement the index and go */
if (sector-- == 0)
break;
}
else
{
/* check for matching sector ID */
if (sector == dmk_idam_sector(&local_idam[0]))
break;
}
}
}
if (i >= DMK_TOC_LEN / 2)
{
err = FLOPPY_ERROR_SEEKERROR;
goto done;
}
/* we found a matching sector ID */
/*state = 0;*/
offs = idam_offset + 2 * DMK_IDAM_LEN;
/* find pattern 0x0000FB; this represents the start of a data sector */
sec_data = my_memmem(&track_data[offs], 4 * (DMK_ID_GAP_LEN + DMK_DAM_LEN), (UINT8 *)needle_data, 10);
if(!sec_data)
{
/* find pattern 0x0000FA; this represents the start of a deleted data sector (used for system sectors) */
sec_data = my_memmem(&track_data[offs], 4 * (DMK_ID_GAP_LEN + DMK_DAM_LEN), (UINT8 *)needle_deleted_data_fa, 10);
}
if(!sec_data)
{
/* find pattern 0x0000F8; this represents the start of a deleted data sector (used for system sectors) */
sec_data = my_memmem(&track_data[offs], 4 * (DMK_ID_GAP_LEN + DMK_DAM_LEN), (UINT8 *)needle_deleted_data_f8, 10);
}
if(sec_data)
sec_data += 10;
else
{
err = FLOPPY_ERROR_SEEKERROR;
goto done;
}
offs = sec_data - &track_data[offs];
sec_len = 128 << dmk_idam_sectorlength(&local_idam[0]);
if ((offs + 2 * sec_len) > track_length)
{
err = FLOPPY_ERROR_INVALIDIMAGE;
goto done;
}
if (sector_data)
*sector_data = sec_data;
if (sector_length)
*sector_length = sec_len;
done:
return err;
}
static floperr_t z80ne_dmk_get_sector_length(floppy_image_legacy *floppy, int head, int track, int sector, UINT32 *sector_length)
{
return z80ne_dmk_seek_sector_in_track(floppy, head, track, sector, FALSE, FALSE, NULL, sector_length);
}
static floperr_t z80ne_dmk_get_indexed_sector_info(floppy_image_legacy *floppy, int head, int track, int sector_index, int *cylinder, int *side, int *sector, UINT32 *sector_length, unsigned long *flags)
{
floperr_t err;
size_t idam_offset;
UINT8 *track_data;
void *track_data_v;
unsigned long dam;
if (sector_index * 2 >= DMK_TOC_LEN)
return FLOPPY_ERROR_SEEKERROR;
err = floppy_load_track(floppy, head, track, FALSE, &track_data_v, NULL);
if (err)
return err;
track_data = (UINT8 *) track_data_v;
idam_offset = track_data[sector_index * 2 + 1];
idam_offset <<= 8;
idam_offset |= track_data[sector_index * 2 + 0];
idam_offset &= 0x3FFF;
if (idam_offset == 0)
return FLOPPY_ERROR_SEEKERROR;
/* determine type of data sector */
/* find pattern 0x0000FB; this represents the start of a data sector */
if ( my_memmem(&track_data[idam_offset+14], 4 * (DMK_ID_GAP_LEN + DMK_DAM_LEN), (UINT8 *)needle_data, 10) )
dam = 0;
/* find pattern 0x0000FA; this represents the start of a deleted data sector (used for system sectors) */
else if ( my_memmem(&track_data[idam_offset+14], 4 * (DMK_ID_GAP_LEN + DMK_DAM_LEN), (UINT8 *)needle_deleted_data_fa, 10) )
dam = ID_FLAG_DELETED_DATA;
/* find pattern 0x0000F8; this represents the start of a deleted data sector (used for system sectors) */
else if ( my_memmem(&track_data[idam_offset+14], 4 * (DMK_ID_GAP_LEN + DMK_DAM_LEN), (UINT8 *)needle_deleted_data_f8, 10) )
dam = ID_FLAG_DELETED_DATA;
else
return FLOPPY_ERROR_SEEKERROR;
if (cylinder)
*cylinder = (&track_data[idam_offset])[2];
if (side)
*side = (&track_data[idam_offset])[4];
if (sector)
*sector = (&track_data[idam_offset])[6];
if (sector_length)
*sector_length = 128 << (&track_data[idam_offset])[8];
if (flags)
*flags = dam;
return FLOPPY_ERROR_SUCCESS;
}
static floperr_t internal_z80ne_dmk_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, void *buffer, size_t buflen)
{
floperr_t err;
UINT32 sector_length;
UINT16 crc_on_disk;
UINT16 calculated_crc;
UINT8 *sector_data = NULL;
dynamic_buffer local_sector;
int local_sector_size;
int i;
/* get sector length and data pointer */
err = z80ne_dmk_seek_sector_in_track(floppy, head, track, sector, sector_is_index, FALSE, &sector_data, &sector_length);
if (err)
goto done;
/* set up a local physical sector space (DAM + data + crc + GAP) */
local_sector_size = (DMK_DAM_LEN + sector_length + DMK_DATA_CRC_LEN + DMK_DATA_GAP_LEN);
local_sector.resize_and_clear(local_sector_size);
/* get sector data */
/* create a local copy of sector data including DAM (for crc calculation) */
for(i = 0; i < (DMK_DAM_LEN + sector_length + DMK_DATA_CRC_LEN); i++)
local_sector[i] = (sector_data - 2)[i*2];
crc_on_disk = local_sector[sector_length + 0 + 1];
crc_on_disk <<= 8;
crc_on_disk += local_sector[sector_length + 1 + 1];
/* crc calculated including DAM */
calculated_crc = ccitt_crc16(0xffff, local_sector, sector_length+1);
if (calculated_crc != crc_on_disk)
{
err = FLOPPY_ERROR_INVALIDIMAGE;
goto done;
}
/* copy local sector data excluding DAM */
memcpy(buffer, local_sector+1, MIN(sector_length, buflen));
done:
return err;
}
static floperr_t internal_z80ne_dmk_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, int sector_is_index, const void *buffer, size_t buflen, int ddam)
{
floperr_t err;
UINT32 sector_length;
UINT8 *sector_data;
UINT16 crc;
dynamic_buffer local_sector;
int local_sector_size;
int i;
/* get sector length */
err = z80ne_dmk_seek_sector_in_track(floppy, head, track, sector, sector_is_index, TRUE, &sector_data, &sector_length);
if (err)
goto done;
/* set up a local physical sector space */
local_sector_size = (DMK_DAM_LEN + sector_length + DMK_DATA_CRC_LEN + DMK_DATA_GAP_LEN);
local_sector.resize_and_clear(local_sector_size);
if(!ddam)
local_sector[0] = 0xFB;
else
local_sector[0] = 0xFA;
if (buflen > sector_length)
{
err = FLOPPY_ERROR_INTERNAL;
goto done;
}
memcpy(&local_sector[1], buffer, buflen);
crc = ccitt_crc16(0xffff, local_sector, DMK_DAM_LEN + sector_length);
local_sector[DMK_DAM_LEN + sector_length + 0] = crc >> 8;
local_sector[DMK_DAM_LEN + sector_length + 1] = crc >> 0;
/* write local sector in track doubling every byte (DMK double density mode) */
/* write DAM or DDAM too */
sector_data -= 2;
for(i=0; i < (DMK_DAM_LEN + sector_length + DMK_DATA_CRC_LEN); i++)
sector_data[i*2] = sector_data[(i*2)+1] = local_sector[i];
done:
return err;
}
static floperr_t z80ne_dmk_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen)
{
return internal_z80ne_dmk_read_sector(floppy, head, track, sector, FALSE, buffer, buflen);
}
static floperr_t z80ne_dmk_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
{
return internal_z80ne_dmk_write_sector(floppy, head, track, sector, FALSE, buffer, buflen, ddam);
}
static floperr_t z80ne_dmk_read_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen)
{
return internal_z80ne_dmk_read_sector(floppy, head, track, sector, TRUE, buffer, buflen);
}
static floperr_t z80ne_dmk_write_indexed_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
{
return internal_z80ne_dmk_write_sector(floppy, head, track, sector, TRUE, buffer, buflen, ddam);
}
static void z80ne_dmk_interpret_header(floppy_image_legacy *floppy, int *heads, int *tracks, int * sectors, int *track_size)
{
UINT8 header[DMK_HEADER_LEN + DMK_TOC_LEN];
int i;
int idam_offset;
int sects;
floppy_image_read(floppy, header, 0, DMK_HEADER_LEN + DMK_TOC_LEN);
if (tracks)
*tracks = header[1];
if (heads)
*heads = (header[4] & 0x10) ? 1 : 2;
if (track_size)
*track_size = ((int) header[3]) * 0x100 + header[2];
if(sectors)
{
/* count sectors on first track */
sects = 0;
for (i = 0; i < DMK_TOC_LEN / 2; i++)
{
idam_offset = header[DMK_HEADER_LEN + i * 2 + 1];
idam_offset <<= 8;
idam_offset |= header[DMK_HEADER_LEN + i * 2 + 0];
idam_offset &= 0x3FFF;
if (idam_offset == 0)
break;
else
sects++;
}
*sectors = sects;
}
}
FLOPPY_CONSTRUCT(z80ne_dmk_construct)
{
struct FloppyCallbacks *callbacks;
struct dmk_tag *tag;
UINT8 header[DMK_HEADER_LEN];
int heads, tracks, track_size, sectors, sector_length;
if (params)
{
heads = option_resolution_lookup_int(params, PARAM_HEADS);
tracks = option_resolution_lookup_int(params, PARAM_TRACKS);
sectors = option_resolution_lookup_int(params, PARAM_SECTORS);
sector_length = option_resolution_lookup_int(params, PARAM_SECTOR_LENGTH);
track_size = z80ne_dmk_min_track_size(sectors, sector_length);
memset(header, 0, sizeof(header));
header[1] = tracks;
header[2] = track_size >> 0;
header[3] = track_size >> 8;
header[4] = (heads == 2) ? 0x00 : 0x10;
floppy_image_write(floppy, header, 0, sizeof(header));
}
else
{
z80ne_dmk_interpret_header(floppy, &heads, &tracks, &sectors, &track_size);
}
tag = (dmk_tag*)floppy_create_tag(floppy, sizeof(struct dmk_tag));
if (!tag)
return FLOPPY_ERROR_OUTOFMEMORY;
tag->heads = heads;
tag->track_size = track_size;
tag->tracks = tracks;
callbacks = floppy_callbacks(floppy);
callbacks->read_track = z80ne_dmk_read_track;
callbacks->write_track = z80ne_dmk_write_track;
callbacks->get_track_data_offset = z80ne_dmk_get_track_data_offset;
callbacks->format_track = z80ne_dmk_format_track;
callbacks->get_heads_per_disk = z80ne_dmk_get_heads_per_disk;
callbacks->get_tracks_per_disk = z80ne_dmk_get_tracks_per_disk;
callbacks->get_track_size = z80ne_dmk_get_track_size;
callbacks->get_sector_length = z80ne_dmk_get_sector_length;
callbacks->get_indexed_sector_info = z80ne_dmk_get_indexed_sector_info;
callbacks->read_sector = z80ne_dmk_read_sector;
callbacks->write_sector = z80ne_dmk_write_sector;
callbacks->read_indexed_sector = z80ne_dmk_read_indexed_sector;
callbacks->write_indexed_sector = z80ne_dmk_write_indexed_sector;
return FLOPPY_ERROR_SUCCESS;
}
FLOPPY_IDENTIFY(z80ne_dmk_identify)
{
int heads, tracks, sectors, track_size;
UINT64 size, expected_size;
size = floppy_image_size(floppy);
z80ne_dmk_interpret_header(floppy, &heads, &tracks, &sectors, &track_size);
expected_size = DMK_HEADER_LEN + (heads * tracks * track_size);
*vote = (size == expected_size) ? 90 : 0;
*vote += (sectors == 10) ? 10 : 0;
return FLOPPY_ERROR_SUCCESS;
}
/* ----------------------------------------------------------------------- */
LEGACY_FLOPPY_OPTIONS_START( z80ne )
/*
* Single side
* Single density
* FM, 125 kbit/s,
* 40 tracks, track ID: 0..39
* 10 sectors/track, sector ID: 0..9
* 256 bytes/sector
* Interleave 1 (sector ID sequence on track: 0 5 1 6 2 7 3 8 4 9)
* 3125 byte/track unformatted
* Rotation speed 300 rpm (5 rps)
*/
LEGACY_FLOPPY_OPTION( z80ne_dmk, "zmk", "Z80NE DMK disk image", z80ne_dmk_identify, z80ne_dmk_construct, NULL,
HEADS([1])
TRACKS([40])
SECTORS([10])
SECTOR_LENGTH([256])
INTERLEAVE([1])
FIRST_SECTOR_ID([0]))
LEGACY_FLOPPY_OPTIONS_END
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