summaryrefslogtreecommitdiffstatshomepage
path: root/src/lib/formats/victor9k_dsk.cpp
blob: 3a142629726f2f2a2927233e487ec685bbea0e69 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
// 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 "formats/victor9k_dsk.h"

#include "ioprocs.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(util::random_read &io, uint32_t form_factor)
{
	uint64_t size;
	if(io.length(size))
		return -1;

	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(util::random_read &io, uint32_t form_factor, const std::vector<uint32_t> &variants)
{
	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", util::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 &current_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(util::random_read &io, uint32_t form_factor, const std::vector<uint32_t> &variants, floppy_image *image)
{
	int const type = find_size(io, form_factor);
	if(type == -1)
		return false;

	const format &f = formats[type];

	uint64_t size;
	if(io.length(size))
		return false;

	std::vector<uint8_t> img;
	try { img.resize(size); }
	catch (...) { return false; }

	size_t actual;
	io.read_at(0, &img[0], size, actual);

	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) {
				osd_printf_error("victor9k_format: Incorrect track layout, max_size=%d, current_size=%d\n", total_size, current_size);
				return false;
			}

			// 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(util::random_read_write &io, const std::vector<uint32_t> &variants, 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);
			size_t actual;
			io.write_at(offset, sectdata, track_size, actual);
		}
	}

	return true;
}

void victor9k_format::extract_sectors(floppy_image *image, const format &f, desc_s *sdesc, int track, int head, int sector_count)
{
	// Extract the sectors
	auto bitstream = generate_bitstream_from_track(track, head, cell_size[speed_zone[head][track]], image);
	auto sectors = extract_sectors_from_bitstream_victor_gcr5(bitstream);

	for(int i=0; i<sector_count; i++) {
		desc_s &ds = sdesc[i];
		const auto &data = sectors[ds.sector_id];
		if(data.empty())
			memset((void *)ds.data, 0, ds.size);
		else if(data.size() < ds.size) {
			memcpy((void *)ds.data, data.data(), data.size());
			memset((uint8_t *)ds.data + data.size(), 0, data.size() - ds.size);
		} else
			memcpy((void *)ds.data, data.data(), ds.size);
	}
}

const floppy_format_type FLOPPY_VICTOR_9000_FORMAT = &floppy_image_format_creator<victor9k_format>;