// license:BSD-3-Clause
// copyright-holders:Curt Coder
/*********************************************************************
formats/victor9k_dsk.c
Victor 9000 sector disk image format
*********************************************************************/
/*
Sector format
-------------
Header sync
Sector header (header ID, track ID, sector ID, and checksum)
Gap 1
Data Sync
Data field (data sync, data ID, data bytes, and checksum)
Gap 2
Track format
------------
ZONE LOWER HEAD UPPER HEAD SECTORS ROTATIONAL RPM
NUMBER TRACKS TRACKS PER TRACK PERIOD (MS)
0 0-3 unused 19 237.9 252
1 4-15 0-7 18 224.5 267
2 16-26 8-18 17 212.2 283
3 27-37 19-29 16 199.9 300
4 38-48 30-40 15 187.6 320
5 49-59 41-51 14 175.3 342
6 60-70 52-62 13 163.0 368
7 71-79 63-74 12 149.6 401
8 unused 75-79 11 144.0 417
Interleave factor 3
cell 2.13 usec
Boot Disc Label Format
Track 0 Sector 0
Byte
Offset Name Description
0 System disc ID literally, ff,00h for a system
disc
2 Load address paragraph to load booted
program at. If zero then boot
loads in high memory.
4 Length paragraph count to load.
6 Entry offset I.P. value for transfer of
control.
8 Entry segment C.S. value for transfer of
control.
10 I.D. disc identifier.
18 Part number system identifier - displayed
by early versions of boot.
26 Sector size byte count for sectors.
28 Data start first data sector on disc
(absolute sectors).
30 Boot start first absolute sector of
program for boot to load at
'load address' for 'length'
paragraphs.
32 Flags indicators:
bit meaning
15-12 interleave factor
(0-15)
0 0=single sided
1=double sided
34 Disc type 00 = CP/M
01 = MS-DOS
35 Reserved
38 Speed table information for speed control
proc.
56 Zone table high track for each zone.
71 Sector/track sectors per track for each
zone.
*/
#include "emu.h" // osd_printf_verbose, BIT, emu_fatalerror
#include "formats/victor9k_dsk.h"
victor9k_format::victor9k_format()
{
}
const char *victor9k_format::name() const
{
return "victor9k";
}
const char *victor9k_format::description() const
{
return "Victor 9000 disk image";
}
const char *victor9k_format::extensions() const
{
return "img";
}
int victor9k_format::find_size(io_generic *io, uint32_t form_factor)
{
uint64_t size = io_generic_size(io);
for(int i=0; formats[i].sector_count; i++) {
const format &f = formats[i];
if(size == (uint32_t) f.sector_count*f.sector_base_size*f.head_count)
return i;
}
return -1;
}
int victor9k_format::identify(io_generic *io, uint32_t form_factor)
{
int type = find_size(io, form_factor);
if (type != -1)
return 50;
return 0;
}
void victor9k_format::log_boot_sector(uint8_t *data)
{
// System disc ID
osd_printf_verbose("System disc: %s\n", ((data[0] == 0xff) && (data[1] == 0x00)) ? "yes" : "no");
// Load address
osd_printf_verbose("Load address: %04x\n", (data[1] << 8) | data[2]);
// Length
osd_printf_verbose("Length: %04x\n", (data[3] << 8) | data[4]);
// Entry offset
osd_printf_verbose("Entry offset: %04x\n", (data[5] << 8) | data[6]);
// Entry segment
osd_printf_verbose("Entry segment: %04x\n", (data[7] << 8) | data[8]);
// I.D.
//osd_printf_verbose("I.D.: %s\n", data[10]);
// Part number
//osd_printf_verbose("Part number: %s\n", data[18]);
// Sector size
osd_printf_verbose("Sector size: %04x\n", (data[25] << 8) | data[26]);
// Data start
osd_printf_verbose("Data start: %04x\n", (data[27] << 8) | data[28]);
// Boot start
osd_printf_verbose("Boot start: %04x\n", (data[29] << 8) | data[30]);
// Flags
osd_printf_verbose("%s sided\n", BIT(data[33], 0) ? "Double" : "Single");
osd_printf_verbose("Interleave factor: %u\n", data[32] >> 4);
// Disc type
switch (data[34]) {
case 0x00: osd_printf_verbose("Disc type: CP/M\n"); break;
case 0x01: osd_printf_verbose("Disc type: MS-DOS\n"); break;
default: osd_printf_verbose("Disc type: unknown\n"); break;
}
// Speed table
osd_printf_verbose("Speed table: ");
for (int i = 38; i < 56; i++) {
osd_printf_verbose("%02x ", data[i]);
}
osd_printf_verbose("\n");
// Zone table
osd_printf_verbose("Zone table: ");
for (int i = 56; i < 71; i++) {
osd_printf_verbose("%02x ", data[i]);
}
osd_printf_verbose("\n");
// Sector/track
osd_printf_verbose("Sector/track: ");
for (int i = 71; i < 86; i++) {
osd_printf_verbose("%02x ", data[i]);
}
osd_printf_verbose("\n");
}
floppy_image_format_t::desc_e* victor9k_format::get_sector_desc(const format &f, int ¤t_size, int sector_count)
{
static floppy_image_format_t::desc_e desc[] = {
/* 00 */ { SECTOR_INTERLEAVE_SKEW, 0, 0},
/* 01 */ { SECTOR_LOOP_START, 0, -1 },
/* 02 */ { SYNC_GCR5, 9 },
/* 03 */ { GCR5, 0x07, 1 },
/* 04 */ { CRC_VICTOR_HDR_START, 1 },
/* 05 */ { TRACK_ID_VICTOR_GCR5 },
/* 06 */ { SECTOR_ID_GCR5 },
/* 07 */ { CRC_END, 1 },
/* 08 */ { CRC, 1 },
/* 09 */ { RAWBYTE, 0x55, 8 },
/* 10 */ { SYNC_GCR5, 5 },
/* 11 */ { GCR5, 0x08, 1 },
/* 12 */ { CRC_VICTOR_DATA_START, 2 },
/* 13 */ { SECTOR_DATA_GCR5, -1 },
/* 14 */ { CRC_END, 2 },
/* 15 */ { CRC, 2 },
/* 16 */ { RAWBYTE, 0x55, 8 },
/* 17 */ { SECTOR_LOOP_END },
/* 18 */ { RAWBYTE, 0x55, 0 },
/* 19 */ { RAWBITS, 0x5555, 0 },
/* 20 */ { END }
};
current_size = 90 + (1+1+1+1)*10 + 8*8 + 50 + (1+f.sector_base_size+2)*10 + 8*8;
current_size *= sector_count;
return desc;
}
void victor9k_format::build_sector_description(const format &f, uint8_t *sectdata, uint32_t sect_offs, desc_s *sectors, int sector_count) const
{
for (int i = 0; i < sector_count; i++) {
sectors[i].data = sectdata + sect_offs;
sectors[i].size = f.sector_base_size;
sectors[i].sector_id = i;
sect_offs += sectors[i].size;
}
}
bool victor9k_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
{
int type = find_size(io, form_factor);
if(type == -1)
return false;
const format &f = formats[type];
uint64_t size = io_generic_size(io);
std::vector<uint8_t> img;
img.resize(size);
io_generic_read(io, &img[0], 0, size);
log_boot_sector(&img[0]);
int track_offset = 0;
for (int head = 0; head < f.head_count; head++) {
for (int track = 0; track < f.track_count; track++) {
int current_size = 0;
int total_size = 200000000./cell_size[speed_zone[head][track]];
int sector_count = sectors_per_track[head][track];
int track_size = sector_count*f.sector_base_size;
floppy_image_format_t::desc_e *desc = get_sector_desc(f, current_size, sector_count);
int remaining_size = total_size - current_size;
if(remaining_size < 0)
throw emu_fatalerror("victor9k_format: Incorrect track layout, max_size=%d, current_size=%d", total_size, current_size);
// Fixup the end gap
desc[18].p2 = remaining_size / 8;
desc[19].p2 = remaining_size & 7;
desc[19].p1 >>= remaining_size & 0x01;
desc_s sectors[40];
build_sector_description(f, &img[0], track_offset, sectors, sector_count);
generate_track(desc, track, head, sectors, sector_count, total_size, image);
track_offset += track_size;
}
}
image->set_variant(f.variant);
return true;
}
int victor9k_format::get_rpm(int head, int track)
{
return rpm[speed_zone[head][track]];
}
int victor9k_format::get_image_offset(const format &f, int _head, int _track)
{
int offset = 0;
if (_head) {
for (int track = 0; track < f.track_count; track++) {
offset += compute_track_size(f, _head, track);
}
}
for (int track = 0; track < _track; track++) {
offset += compute_track_size(f, _head, track);
}
return offset;
}
int victor9k_format::compute_track_size(const format &f, int head, int track)
{
return sectors_per_track[head][track] * f.sector_base_size;
}
const victor9k_format::format victor9k_format::formats[] = {
{ //
floppy_image::FF_525, floppy_image::SSDD, 1224, 80, 1, 512
},
{ //
floppy_image::FF_525, floppy_image::DSDD, 2448, 80, 2, 512
},
{}
};
const uint32_t victor9k_format::cell_size[9] =
{
1789, 1896, 2009, 2130, 2272, 2428, 2613, 2847, 2961
};
const int victor9k_format::sectors_per_track[2][80] =
{
{
19, 19, 19, 19,
18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18,
17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
12, 12, 12, 12, 12, 12, 12, 12, 12
},
{
18, 18, 18, 18, 18, 18, 18, 18,
17, 17, 17, 17, 17, 17, 17, 17, 17, 17, 17,
16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
11, 11, 11, 11, 11
}
};
const int victor9k_format::speed_zone[2][80] =
{
{
0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7
},
{
1, 1, 1, 1, 1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8
}
};
const int victor9k_format::rpm[9] =
{
252, 267, 283, 300, 321, 342, 368, 401, 417
};
bool victor9k_format::save(io_generic *io, floppy_image *image)
{
const format &f = formats[0];
for(int head=0; head < f.head_count; head++) {
for(int track=0; track < f.track_count; track++) {
int sector_count = sectors_per_track[head][track];
int track_size = compute_track_size(f, head, track);
uint8_t sectdata[40*512];
desc_s sectors[40];
int offset = get_image_offset(f, head, track);
build_sector_description(f, sectdata, 0, sectors, sector_count);
extract_sectors(image, f, sectors, track, head, sector_count);
io_generic_write(io, sectdata, offset, track_size);
}
}
return true;
}
void victor9k_format::extract_sectors(floppy_image *image, const format &f, desc_s *sdesc, int track, int head, int sector_count)
{
uint8_t bitstream[500000/8];
uint8_t sectdata[50000];
desc_xs sectors[256];
int track_size;
// Extract the sectors
generate_bitstream_from_track(track, head, cell_size[speed_zone[head][track]], bitstream, track_size, image);
extract_sectors_from_bitstream_victor_gcr5(bitstream, track_size, sectors, sectdata, sizeof(sectdata));
for(int i=0; i<sector_count; i++) {
desc_s &ds = sdesc[i];
desc_xs &xs = sectors[ds.sector_id];
if(!xs.data)
memset((void *)ds.data, 0, ds.size);
else if(xs.size < ds.size) {
memcpy((void *)ds.data, xs.data, xs.size);
memset((uint8_t *)ds.data + xs.size, 0, xs.size - ds.size);
} else
memcpy((void *)ds.data, xs.data, ds.size);
}
}
const floppy_format_type FLOPPY_VICTOR_9000_FORMAT = &floppy_image_format_creator<victor9k_format>;