-
Notifications
You must be signed in to change notification settings - Fork 2.1k
/
Copy pathap2_dsk.cpp
1768 lines (1543 loc) · 56 KB
/
ap2_dsk.cpp
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
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert, R. Belmont
/*********************************************************************
ap2_dsk.c
Apple II disk images
*********************************************************************/
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "ap2_dsk.h"
#include "basicdsk.h"
#define APPLE2_IMAGE_DO 0
#define APPLE2_IMAGE_PO 1
#define APPLE2_IMAGE_NIB 2
/* used in for all Apple II images */
static uint32_t apple2_get_track_size(floppy_image_legacy *floppy, int head, int track);
static int disk_decode_nib(uint8_t *data, const uint8_t *nibble, int *volume, int *track, int *sector);
static void disk_encode_nib(uint8_t *nibble, const uint8_t *data, int volume, int track, int sector);
/* used in DOS/ProDOS order images */
static int apple2_do_translate_sector(floppy_image_legacy *floppy, int sector);
static int apple2_po_translate_sector(floppy_image_legacy *floppy, int sector);
static floperr_t apple2_dsk_read_track(floppy_image_legacy *floppy, int head, int track, uint64_t offset, void *buffer, size_t buflen);
static floperr_t apple2_dsk_write_track(floppy_image_legacy *floppy, int head, int track, uint64_t offset, const void *buffer, size_t buflen);
/* used in nibble order images */
static floperr_t apple2_nib_read_track(floppy_image_legacy *floppy, int head, int track, uint64_t offset, void *buffer, size_t buflen);
static floperr_t apple2_nib_write_track(floppy_image_legacy *floppy, int head, int track, uint64_t offset, const void *buffer, size_t buflen);
static floperr_t apple2_nib_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen);
static floperr_t apple2_nib_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam);
static floperr_t apple2_nib_get_sector_length(floppy_image_legacy *floppy, int head, int track, int sector, uint32_t *sector_length);
static const uint8_t translate6[0x40] =
{
0x96, 0x97, 0x9a, 0x9b, 0x9d, 0x9e, 0x9f, 0xa6,
0xa7, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb2, 0xb3,
0xb4, 0xb5, 0xb6, 0xb7, 0xb9, 0xba, 0xbb, 0xbc,
0xbd, 0xbe, 0xbf, 0xcb, 0xcd, 0xce, 0xcf, 0xd3,
0xd6, 0xd7, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde,
0xdf, 0xe5, 0xe6, 0xe7, 0xe9, 0xea, 0xeb, 0xec,
0xed, 0xee, 0xef, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6,
0xf7, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
};
/* -----------------------------------------------------------------------
* Utility code
* ----------------------------------------------------------------------- */
static const uint8_t *get_untranslate6_map(void)
{
static uint8_t map[256];
static int map_inited = 0;
uint8_t i;
if (!map_inited)
{
memset(map, 0xff, sizeof(map));
for (i = 0; i < ARRAY_LENGTH(translate6); i++)
map[translate6[i]] = i;
map_inited = 1;
}
return map;
}
/* -----------------------------------------------------------------------
* Core constructor
* ----------------------------------------------------------------------- */
static floperr_t apple2_general_construct(floppy_image_legacy *floppy, int floppy_type)
{
floperr_t err;
struct basicdsk_geometry geometry;
struct FloppyCallbacks *format;
format = floppy_callbacks(floppy);
switch(floppy_type) {
case APPLE2_IMAGE_DO:
case APPLE2_IMAGE_PO:
memset(&geometry, 0, sizeof(geometry));
geometry.heads = 1;
geometry.tracks = APPLE2_TRACK_COUNT;
geometry.sectors = APPLE2_SECTOR_COUNT;
geometry.sector_length = APPLE2_SECTOR_SIZE;
geometry.translate_sector = (floppy_type == APPLE2_IMAGE_DO) ? apple2_do_translate_sector : apple2_po_translate_sector;
err = basicdsk_construct(floppy, &geometry);
if (err)
return err;
format->read_track = apple2_dsk_read_track;
format->write_track = apple2_dsk_write_track;
break;
case APPLE2_IMAGE_NIB:
format->read_track = apple2_nib_read_track;
format->write_track = apple2_nib_write_track;
format->read_sector = apple2_nib_read_sector;
format->write_sector = apple2_nib_write_sector;
format->get_sector_length = apple2_nib_get_sector_length;
break;
default:
assert(0);
return FLOPPY_ERROR_INTERNAL;
}
format->get_track_size = apple2_get_track_size;
return FLOPPY_ERROR_SUCCESS;
}
/* -----------------------------------------------------------------------
* DOS order and ProDOS order code
* ----------------------------------------------------------------------- */
static FLOPPY_IDENTIFY(apple2_dsk_identify)
{
uint64_t size;
uint64_t expected_size;
size = floppy_image_size(floppy);
expected_size = APPLE2_TRACK_COUNT * APPLE2_SECTOR_COUNT * APPLE2_SECTOR_SIZE;
if (size == expected_size)
*vote = 100;
else if ((size > expected_size) && ((size - expected_size) < 8))
*vote = 90; /* tolerate images with up to eight fewer/extra bytes (bug #638) */
else if ((size < expected_size) && ((expected_size - size) < 8))
*vote = 90; /* tolerate images with up to eight fewer/extra bytes (bug #638) */
else
*vote = 0;
return FLOPPY_ERROR_SUCCESS;
}
static int apple2_do_translate_sector(floppy_image_legacy *floppy, int sector)
{
static const uint8_t skewing[] =
{
/* DOS order (*.do) */
0x00, 0x07, 0x0E, 0x06, 0x0D, 0x05, 0x0C, 0x04,
0x0B, 0x03, 0x0A, 0x02, 0x09, 0x01, 0x08, 0x0F
};
return skewing[sector];
}
static int apple2_po_translate_sector(floppy_image_legacy *floppy, int sector)
{
static const uint8_t skewing[] =
{
/* ProDOS order (*.po) */
0x00, 0x08, 0x01, 0x09, 0x02, 0x0A, 0x03, 0x0B,
0x04, 0x0C, 0x05, 0x0D, 0x06, 0x0E, 0x07, 0x0F
};
return skewing[sector];
}
static FLOPPY_CONSTRUCT(apple2_do_construct)
{
return apple2_general_construct(floppy, APPLE2_IMAGE_DO);
}
static FLOPPY_CONSTRUCT(apple2_po_construct)
{
return apple2_general_construct(floppy, APPLE2_IMAGE_PO);
}
static floperr_t apple2_dsk_read_track(floppy_image_legacy *floppy, int head, int track, uint64_t offset, void *buffer, size_t buflen)
{
uint8_t sector_buffer[APPLE2_SECTOR_SIZE];
int sector;
uint8_t *nibble;
if (buflen < APPLE2_NIBBLE_SIZE*APPLE2_SECTOR_COUNT)
return FLOPPY_ERROR_INTERNAL;
if (offset != 0)
return FLOPPY_ERROR_UNSUPPORTED;
memset(buffer, 0, buflen);
for (sector = 0; sector < APPLE2_SECTOR_COUNT; sector++)
{
nibble = (uint8_t *)buffer;
nibble += sector * APPLE2_SMALL_NIBBLE_SIZE;
floppy_read_sector(floppy, head, track, sector, 0, sector_buffer, sizeof(sector_buffer));
disk_encode_nib(nibble, sector_buffer, 254, track, sector);
}
return FLOPPY_ERROR_SUCCESS;
}
static floperr_t apple2_dsk_write_track(floppy_image_legacy *floppy, int head, int track, uint64_t offset, const void *buffer, size_t buflen)
{
int sector;
uint8_t sector_buffer[APPLE2_SECTOR_SIZE];
const uint8_t *nibble;
if (offset != 0)
return FLOPPY_ERROR_UNSUPPORTED;
for (sector = 0; sector < APPLE2_SECTOR_COUNT; sector++)
{
nibble = (uint8_t *)buffer;
nibble += sector * APPLE2_SMALL_NIBBLE_SIZE;
disk_decode_nib(sector_buffer, nibble, nullptr, nullptr, nullptr);
floppy_write_sector(floppy, head, track, sector, 0, sector_buffer, sizeof(sector_buffer), 0);
}
return FLOPPY_ERROR_SUCCESS;
}
/* -----------------------------------------------------------------------
* Nibble order code
* ----------------------------------------------------------------------- */
static FLOPPY_IDENTIFY(apple2_nib_identify)
{
uint64_t size;
size = floppy_image_size(floppy);
*vote = ((size == APPLE2_TRACK_COUNT * APPLE2_SECTOR_COUNT * APPLE2_NIBBLE_SIZE) || (size == (APPLE2_TRACK_COUNT + 1) * APPLE2_SECTOR_COUNT * APPLE2_NIBBLE_SIZE)) ? 100 : 0;
return FLOPPY_ERROR_SUCCESS;
}
static FLOPPY_CONSTRUCT(apple2_nib_construct)
{
return apple2_general_construct(floppy, APPLE2_IMAGE_NIB);
}
static floperr_t apple2_nib_read_track(floppy_image_legacy *floppy, int head, int track, uint64_t offset, void *buffer, size_t buflen)
{
if ((head != 0) || (track < 0) || (track > APPLE2_TRACK_COUNT))
return FLOPPY_ERROR_SEEKERROR;
if (offset != 0)
return FLOPPY_ERROR_UNSUPPORTED;
floppy_image_read(floppy, buffer, track * APPLE2_NIBBLE_SIZE * APPLE2_SECTOR_COUNT, buflen);
return FLOPPY_ERROR_SUCCESS;
}
static floperr_t apple2_nib_write_track(floppy_image_legacy *floppy, int head, int track, uint64_t offset, const void *buffer, size_t buflen)
{
if ((head != 0) || (track < 0) || (track > APPLE2_TRACK_COUNT))
return FLOPPY_ERROR_SEEKERROR;
if (offset != 0)
return FLOPPY_ERROR_UNSUPPORTED;
floppy_image_write(floppy, buffer, track * APPLE2_NIBBLE_SIZE * APPLE2_SECTOR_COUNT, buflen);
return FLOPPY_ERROR_SUCCESS;
}
/* -----------------------------------------------------------------------
* Track conversion
* ----------------------------------------------------------------------- */
static int decode_nibbyte(uint8_t *nibint, const uint8_t *nibdata)
{
if ((nibdata[0] & 0xAA) != 0xAA)
return 1;
if ((nibdata[1] & 0xAA) != 0xAA)
return 1;
*nibint = (nibdata[0] & ~0xAA) << 1;
*nibint |= (nibdata[1] & ~0xAA) << 0;
return 0;
}
static int disk_decode_nib(uint8_t *data, const uint8_t *nibble, int *volume, int *track, int *sector)
{
uint8_t read_volume;
uint8_t read_track;
uint8_t read_sector;
uint8_t read_checksum;
int i;
uint8_t b, xorvalue, newvalue;
const uint8_t *untranslate6 = get_untranslate6_map();
/* pick apart the volume/track/sector info and checksum */
if (decode_nibbyte(&read_volume, &nibble[10]))
return 1;
if (decode_nibbyte(&read_track, &nibble[12]))
return 1;
if (decode_nibbyte(&read_sector, &nibble[14]))
return 1;
if (decode_nibbyte(&read_checksum, &nibble[16]))
return 1;
if (read_checksum != (read_volume ^ read_track ^ read_sector))
return 1;
/* decode the nibble core */
xorvalue = 0;
for (i = 0; i < 342; i++)
{
b = untranslate6[nibble[i+28]];
if (b == 0xff)
return 1;
newvalue = b ^ xorvalue;
if (i >= 0x56)
{
/* 6 bit */
data[i - 0x56] |= (newvalue << 2);
}
else
{
/* 3 * 2 bit */
data[i + 0x00] = ((newvalue >> 1) & 0x01) | ((newvalue << 1) & 0x02);
data[i + 0x56] = ((newvalue >> 3) & 0x01) | ((newvalue >> 1) & 0x02);
if (i + 0xAC < APPLE2_SECTOR_SIZE)
data[i + 0xAC] = ((newvalue >> 5) & 0x01) | ((newvalue >> 3) & 0x02);
}
xorvalue = newvalue;
}
/* success; write out values if pointers not null */
if (volume)
*volume = read_volume;
if (track)
*track = read_track;
if (sector)
*sector = read_sector;
return 0;
}
static floperr_t apple2_nib_read_sector(floppy_image_legacy *floppy, int head, int track, int sector, void *buffer, size_t buflen)
{
floperr_t err;
const uint8_t *nibble;
uint8_t *track_data;
void *track_data_v;
if ((sector < 0) || (sector >= APPLE2_SECTOR_COUNT))
return FLOPPY_ERROR_SEEKERROR;
if (buflen != APPLE2_SECTOR_SIZE)
return FLOPPY_ERROR_INTERNAL;
err = floppy_load_track(floppy, head, track, false, &track_data_v, nullptr);
if (err)
return err;
track_data = (uint8_t *) track_data_v;
nibble = track_data + (sector * APPLE2_NIBBLE_SIZE);
if (disk_decode_nib((uint8_t *)buffer, nibble, nullptr, nullptr, nullptr))
return FLOPPY_ERROR_INVALIDIMAGE;
return FLOPPY_ERROR_SUCCESS;
}
static void disk_encode_nib(uint8_t *nibble, const uint8_t *data, int volume, int track, int sector)
{
int checksum, oldvalue, xorvalue, i;
/* setup header values */
checksum = volume ^ track ^ sector;
memset(nibble, 0xFF, APPLE2_NIBBLE_SIZE);
nibble[ 7] = 0xD5;
nibble[ 8] = 0xAA;
nibble[ 9] = 0x96;
nibble[10] = (volume >> 1) | 0xAA;
nibble[11] = volume | 0xAA;
nibble[12] = (track >> 1) | 0xAA;
nibble[13] = track | 0xAA;
nibble[14] = (sector >> 1) | 0xAA;
nibble[15] = sector | 0xAA;
nibble[16] = (checksum >> 1) | 0xAA;
nibble[17] = (checksum) | 0xAA;
nibble[18] = 0xDE;
nibble[19] = 0xAA;
nibble[20] = 0xEB;
nibble[25] = 0xD5;
nibble[26] = 0xAA;
nibble[27] = 0xAD;
nibble[27+344] = 0xDE;
nibble[27+345] = 0xAA;
nibble[27+346] = 0xEB;
xorvalue = 0;
for (i = 0; i < 342; i++)
{
if (i >= 0x56)
{
/* 6 bit */
oldvalue = data[i - 0x56];
oldvalue = oldvalue >> 2;
}
else
{
/* 3 * 2 bit */
oldvalue = 0;
oldvalue |= (data[i + 0x00] & 0x01) << 1;
oldvalue |= (data[i + 0x00] & 0x02) >> 1;
oldvalue |= (data[i + 0x56] & 0x01) << 3;
oldvalue |= (data[i + 0x56] & 0x02) << 1;
if (i + 0xAC < APPLE2_SECTOR_SIZE)
{
oldvalue |= (data[i + 0xAC] & 0x01) << 5;
oldvalue |= (data[i + 0xAC] & 0x02) << 3;
}
}
xorvalue ^= oldvalue;
nibble[28+i] = translate6[xorvalue & 0x3F];
xorvalue = oldvalue;
}
nibble[27+343] = translate6[xorvalue & 0x3F];
}
static floperr_t apple2_nib_write_sector(floppy_image_legacy *floppy, int head, int track, int sector, const void *buffer, size_t buflen, int ddam)
{
floperr_t err;
uint8_t *track_data;
void *track_data_v;
if ((sector < 0) || (sector >= APPLE2_SECTOR_COUNT))
return FLOPPY_ERROR_SEEKERROR;
if (buflen != APPLE2_SECTOR_SIZE)
return FLOPPY_ERROR_INTERNAL;
err = floppy_load_track(floppy, head, track, true, &track_data_v, nullptr);
if (err)
return err;
track_data = (uint8_t *) track_data_v;
disk_encode_nib(track_data + sector * APPLE2_NIBBLE_SIZE, (const uint8_t *)buffer, 254, track, sector);
return FLOPPY_ERROR_SUCCESS;
}
static floperr_t apple2_nib_get_sector_length(floppy_image_legacy *floppy, int head, int track, int sector, uint32_t *sector_length)
{
*sector_length = APPLE2_SECTOR_SIZE;
return FLOPPY_ERROR_SUCCESS;
}
static uint32_t apple2_get_track_size(floppy_image_legacy *floppy, int head, int track)
{
return APPLE2_NIBBLE_SIZE * APPLE2_SECTOR_COUNT;
}
/* ----------------------------------------------------------------------- */
LEGACY_FLOPPY_OPTIONS_START( apple2 )
LEGACY_FLOPPY_OPTION( apple2_do, "do,dsk,bin", "Apple ][ DOS order disk image", apple2_dsk_identify, apple2_do_construct, nullptr,
HEADS([1])
TRACKS([35])
SECTORS([16])
SECTOR_LENGTH([256])
FIRST_SECTOR_ID([0]))
LEGACY_FLOPPY_OPTION( apple2_po, "po,dsk,bin", "Apple ][ ProDOS order disk image", apple2_dsk_identify, apple2_po_construct, nullptr,
HEADS([1])
TRACKS([35])
SECTORS([16])
SECTOR_LENGTH([256])
FIRST_SECTOR_ID([0]))
LEGACY_FLOPPY_OPTION( apple2_nib, "dsk,nib", "Apple ][ Nibble order disk image", apple2_nib_identify, apple2_nib_construct, nullptr,
HEADS([1])
TRACKS([35])
SECTORS([16])
SECTOR_LENGTH([256])
FIRST_SECTOR_ID([0]))
LEGACY_FLOPPY_OPTIONS_END
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
/***************************************************************************
New implementation
****************************************************************************/
static const uint8_t dos_skewing[] =
{
0x00, 0x07, 0x0E, 0x06, 0x0D, 0x05, 0x0C, 0x04,
0x0B, 0x03, 0x0A, 0x02, 0x09, 0x01, 0x08, 0x0F
};
static const uint8_t prodos_skewing[] =
{
0x00, 0x08, 0x01, 0x09, 0x02, 0x0A, 0x03, 0x0B,
0x04, 0x0C, 0x05, 0x0D, 0x06, 0x0E, 0x07, 0x0F
};
a2_16sect_format::a2_16sect_format() : floppy_image_format_t(), m_prodos_order(false)
{
}
const char *a2_16sect_format::name() const
{
return "a2_16sect";
}
const char *a2_16sect_format::description() const
{
return "Apple II 16-sector dsk image";
}
const char *a2_16sect_format::extensions() const
{
return "dsk,do,po";
}
bool a2_16sect_format::supports_save() const
{
return true;
}
int a2_16sect_format::identify(io_generic *io, uint32_t form_factor)
{
uint64_t size = io_generic_size(io);
uint32_t expected_size = 35 * 16 * 256;
// check standard size plus some oddball sizes in our softlist
if ((size == expected_size) || (size == 143403) || (size == 143363) || (size == 143358))
{
return 50;
}
return 0;
}
// following is placeholder, is completely wrong.
const floppy_image_format_t::desc_e a2_16sect_format::mac_gcr[] = {
{ SECTOR_LOOP_START, 0, -1 },
{ RAWBITS, 0xff3fcf, 24 }, { RAWBITS, 0xf3fcff, 24 },
{ RAWBITS, 0xff3fcf, 24 }, { RAWBITS, 0xf3fcff, 24 },
{ RAWBITS, 0xff3fcf, 24 }, { RAWBITS, 0xf3fcff, 24 },
{ RAWBITS, 0xff3fcf, 24 }, { RAWBITS, 0xf3fcff, 24 },
{ RAWBITS, 0xff3fcf, 24 }, { RAWBITS, 0xf3fcff, 24 },
{ RAWBITS, 0xff3fcf, 24 }, { RAWBITS, 0xf3fcff, 24 },
{ RAWBITS, 0xff3fcf, 24 }, { RAWBITS, 0xf3fcff, 24 },
{ RAWBITS, 0xff3fcf, 24 }, { RAWBITS, 0xf3fcff, 24 },
{ RAWBITS, 0xd5aa96, 24 },
{ CRC_MACHEAD_START, 0 },
{ TRACK_ID_GCR6 },
{ SECTOR_ID_GCR6 },
{ TRACK_HEAD_ID_GCR6 },
{ SECTOR_INFO_GCR6 },
{ CRC_END, 0 },
{ CRC, 0 },
{ RAWBITS, 0xdeaaff, 24 },
{ RAWBITS, 0xff3fcf, 24 }, { RAWBITS, 0xf3fcff, 24 },
{ RAWBITS, 0xd5aaad, 24 },
{ SECTOR_ID_GCR6 },
{ SECTOR_DATA_MAC, -1 },
{ RAWBITS, 0xdeaaff, 24 },
{ RAWBITS, 0xff, 8 },
{ SECTOR_LOOP_END },
{ END },
};
bool a2_16sect_format::load(io_generic *io, uint32_t form_factor, floppy_image *image)
{
m_prodos_order = false;
int fpos = 0;
for(int track=0; track < 35; track++) {
std::vector<uint32_t> track_data;
uint8_t sector_data[256*16];
static const unsigned char pascal_block1[4] = { 0x08, 0xa5, 0x0f, 0x29 };
static const unsigned char pascal2_block1[4] = { 0xff, 0xa2, 0x00, 0x8e };
static const unsigned char dos33_block1[4] = { 0xa2, 0x02, 0x8e, 0x52 };
static const unsigned char sos_block1[4] = { 0xc9, 0x20, 0xf0, 0x3e };
static const unsigned char a3a2emul_block1[6] = { 0x8d, 0xd0, 0x03, 0x4c, 0xc7, 0xa4 };
static const unsigned char cpm22_block1[8] = { 0xa2, 0x55, 0xa9, 0x00, 0x9d, 0x00, 0x0d, 0xca };
static const unsigned char subnod_block1[8] = { 0x63, 0xaa, 0xf0, 0x76, 0x8d, 0x63, 0xaa, 0x8e };
io_generic_read(io, sector_data, fpos, 256*16);
if (track == 0 && fpos == 0)
{
// check ProDOS boot block
if (!memcmp("PRODOS", §or_data[0x103], 6))
{
m_prodos_order = true;
} // check for alternate version ProDOS boot block
if (!memcmp("PRODOS", §or_data[0x121], 6))
{
m_prodos_order = true;
} // check for ProDOS order SOS disk
else if (!memcmp(sos_block1, §or_data[0x100], 4))
{
m_prodos_order = true;
} // check for Apple III A2 emulator disk in ProDOS order
else if (!memcmp(a3a2emul_block1, §or_data[0x100], 6))
{
m_prodos_order = true;
} // check for PCPI Applicard software in ProDOS order
else if (!memcmp("COPYRIGHT (C) 1979, DIGITAL RESEARCH", §or_data[0x118], 36))
{
m_prodos_order = true;
} // check Apple II Pascal
else if (!memcmp("SYSTEM.APPLE", §or_data[0xd7], 12))
{
// Pascal discs can still be DOS order.
// Check for the second half of the boot code at 0x100
// (which means ProDOS order)
if (!memcmp(pascal_block1, §or_data[0x100], 4))
{
m_prodos_order = true;
}
} // check for DOS 3.3 disks in ProDOS order
else if (!memcmp(dos33_block1, §or_data[0x100], 4))
{
m_prodos_order = true;
} // check for a later version of the Pascal boot block
else if (!memcmp(pascal2_block1, §or_data[0x100], 4))
{
m_prodos_order = true;
} // check for CP/M disks in ProDOS order
else if (!memcmp(cpm22_block1, §or_data[0x100], 8))
{
m_prodos_order = true;
} // check for subnodule disk
else if (!memcmp(subnod_block1, §or_data[0x100], 8))
{
m_prodos_order = true;
}
}
fpos += 256*16;
for(int i=0; i<49; i++)
raw_w(track_data, 10, 0x3fc);
for(int i=0; i<16; i++) {
int sector;
if (m_prodos_order)
{
sector = prodos_skewing[i];
}
else
{
sector = dos_skewing[i];
}
const uint8_t *sdata = sector_data + 256 * sector;
for(int j=0; j<20; j++)
raw_w(track_data, 10, 0x3fc);
raw_w(track_data, 8, 0xff);
raw_w(track_data, 24, 0xd5aa96);
raw_w(track_data, 16, gcr4_encode(0xfe));
raw_w(track_data, 16, gcr4_encode(track));
raw_w(track_data, 16, gcr4_encode(i));
raw_w(track_data, 16, gcr4_encode(0xfe ^ track ^ i));
raw_w(track_data, 24, 0xdeaaeb);
for(int j=0; j<4; j++)
raw_w(track_data, 10, 0x3fc);
raw_w(track_data, 9, 0x01fe);
raw_w(track_data, 24, 0xd5aaad);
raw_w(track_data, 1, 0);
uint8_t pval = 0x00;
for(int i=0; i<342; i++) {
uint8_t nval;
if(i >= 0x56)
nval = sdata[i - 0x56] >> 2;
else {
nval =
((sdata[i+0x00] & 0x01) << 1) |
((sdata[i+0x00] & 0x02) >> 1) |
((sdata[i+0x56] & 0x01) << 3) |
((sdata[i+0x56] & 0x02) << 1);
if(i < 256-0xac)
nval |=
((sdata[i+0xac] & 0x01) << 5) |
((sdata[i+0xac] & 0x02) << 3);
}
raw_w(track_data, 8, translate6[nval ^ pval]);
pval = nval;
}
raw_w(track_data, 8, translate6[pval]);
raw_w(track_data, 24, 0xdeaaeb);
}
raw_w(track_data, 8, 0xff);
assert(track_data.size() == 51090);
generate_track_from_levels(track, 0, track_data, 0, image);
}
return true;
}
uint8_t a2_16sect_format::gb(const uint8_t *buf, int ts, int &pos, int &wrap)
{
uint8_t v = 0;
int w1 = wrap;
while(wrap != w1+2 && !(v & 0x80)) {
v = v << 1 | ((buf[pos >> 3] >> (7-(pos & 7))) & 1);
pos++;
if(pos == ts) {
pos = 0;
wrap++;
}
}
return v;
}
void a2_16sect_format::update_chk(const uint8_t *data, int size, uint32_t &chk)
{
}
//#define VERBOSE_SAVE
bool a2_16sect_format::save(io_generic *io, floppy_image *image)
{
int g_tracks, g_heads;
int visualgrid[16][35]; // visualizer grid, cleared/initialized below
// lenient addr check: if unset, only accept an addr mark if the checksum was good
// if set, accept an addr mark if the track and sector values are both sane
#undef LENIENT_ADDR_CHECK
// if set, use the old, not as robust logic for choosing which copy of a decoded sector to write
// to the resulting image if the sector has a bad checksum and/or postamble
#undef USE_OLD_BEST_SECTOR_PRIORITY
// nothing found
#define NOTFOUND 0
// address mark was found
#define ADDRFOUND 1
// address checksum is good
#define ADDRGOOD 2
// data mark was found (requires addrfound and sane values)
#define DATAFOUND 4
// data checksum is good
#define DATAGOOD 8
// data postamble is good
#define DATAPOST 16
for (auto & elem : visualgrid) {
for (int j = 0; j < 35; j++) {
elem[j] = 0;
}
}
image->get_actual_geometry(g_tracks, g_heads);
int head = 0;
int pos_data = 0;
for(int track=0; track < 35; track++) {
uint8_t sectdata[(256)*16];
memset(sectdata, 0, sizeof(sectdata));
int nsect = 16;
uint8_t buf[10000]; // normal is 51090 cells, e.g. 6387 bytes, add 50% and round up for denser than normal disks
int ts;
#ifdef VERBOSE_SAVE
fprintf(stderr,"DEBUG: a2_16sect_format::save() about to generate bitstream from track %d...", track);
#endif
generate_bitstream_from_track(track, head, 3915, buf, ts, image);
#ifdef VERBOSE_SAVE
fprintf(stderr,"done.\n");
#endif
int pos = 0;
int wrap = 0;
int hb = 0;
int dosver = 0; // apple dos version; 0 = >=3.3, 1 = <3.3
for(;;) {
uint8_t v = gb(buf, ts, pos, wrap);
if(v == 0xff) {
hb = 1;
}
else if(hb == 1 && v == 0xd5){
hb = 2;
}
else if(hb == 2 && v == 0xaa) {
hb = 3;
}
else if(hb == 3 && ((v == 0x96) || (v == 0xab))) { // 0x96 = dos 3.3/16sec, 0xab = dos 3.21 and below/13sec
hb = 4;
if (v == 0xab) dosver = 1;
}
else
hb = 0;
if(hb == 4) {
uint8_t h[11];
for(auto & elem : h)
elem = gb(buf, ts, pos, wrap);
//uint8_t v2 = gcr6bw_tb[h[2]];
uint8_t vl = gcr4_decode(h[0],h[1]);
uint8_t tr = gcr4_decode(h[2],h[3]);
uint8_t se = gcr4_decode(h[4],h[5]);
uint8_t chk = gcr4_decode(h[6],h[7]);
#ifdef VERBOSE_SAVE
uint32_t post = (h[8]<<16)|(h[9]<<8)|h[10];
printf("Address Mark:\tVolume %d, Track %d, Sector %2d, Checksum %02X: %s, Postamble %03X: %s\n", vl, tr, se, chk, (chk ^ vl ^ tr ^ se)==0?"OK":"BAD", post, (post&0xFFFF00)==0xDEAA00?"OK":"BAD");
#endif
// sanity check
if (tr == track && se < nsect) {
visualgrid[se][track] |= ADDRFOUND;
visualgrid[se][track] |= ((chk ^ vl ^ tr ^ se)==0)?ADDRGOOD:0;
#ifdef LENIENT_ADDR_CHECK
if ((visualgrid[se][track] & ADDRFOUND) == ADDRFOUND) {
#else
if ((visualgrid[se][track] & ADDRGOOD) == ADDRGOOD) {
#endif
int opos = pos;
int owrap = wrap;
hb = 0;
for(int i=0; i<20 && hb != 4; i++) {
v = gb(buf, ts, pos, wrap);
if(v == 0xff)
hb = 1;
else if(hb == 1 && v == 0xd5)
hb = 2;
else if(hb == 2 && v == 0xaa)
hb = 3;
else if(hb == 3 && v == 0xad)
hb = 4;
else
hb = 0;
}
if((hb == 4)&&(dosver == 0)) {
visualgrid[se][track] |= DATAFOUND;
uint8_t *dest;
uint8_t data[0x157];
uint32_t dpost = 0;
uint8_t c = 0;
if (m_prodos_order)
{
dest = sectdata+(256)*prodos_skewing[se];
}
else
{
dest = sectdata+(256)*dos_skewing[se];
}
// first read in sector and decode to 6bit form
for(int i=0; i<0x156; i++) {
data[i] = gcr6bw_tb[gb(buf, ts, pos, wrap)] ^ c;
c = data[i];
// printf("%02x ", c);
// if (((i&0xf)+1)==0x10) printf("\n");
}
// read the checksum byte
data[0x156] = gcr6bw_tb[gb(buf,ts,pos,wrap)];
// now read the postamble bytes
for(int i=0; i<3; i++) {
dpost <<= 8;
dpost |= gb(buf, ts, pos, wrap);
}
// next combine in the upper 2 bits of each byte
uint8_t bit_swap[4] = { 0, 2, 1, 3 };
for(int i=0; i<0x56; i++)
data[i+0x056] = data[i+0x056]<<2 | bit_swap[data[i]&3];
for(int i=0; i<0x56; i++)
data[i+0x0ac] = data[i+0x0ac]<<2 | bit_swap[(data[i]>>2)&3];
for(int i=0; i<0x54; i++)
data[i+0x102] = data[i+0x102]<<2 | bit_swap[(data[i]>>4)&3];
// now decode it into 256 bytes
// but only write it if the bitfield of the track shows datagood is NOT set.
// if it is set we don't want to overwrite a guaranteed good read with a bad one
// if past read had a bad checksum or bad postamble...
#ifndef USE_OLD_BEST_SECTOR_PRIORITY
if (((visualgrid[se][track]&DATAGOOD)==0)||((visualgrid[se][track]&DATAPOST)==0)) {
// if the current read is good, and postamble is good, write it in, no matter what.
// if the current read is good and the current postamble is bad, write it in unless the postamble was good before
// if the current read is bad and the current postamble is good and the previous read had neither good, write it in
// if the current read isn't good and neither is the postamble but nothing better
// has been written before, write it anyway.
if ( ((data[0x156] == c) && (dpost&0xFFFF00)==0xDEAA00) ||
(((data[0x156] == c) && (dpost&0xFFFF00)!=0xDEAA00) && ((visualgrid[se][track]&DATAPOST)==0)) ||
(((data[0x156] != c) && (dpost&0xFFFF00)==0xDEAA00) && (((visualgrid[se][track]&DATAGOOD)==0)&&(visualgrid[se][track]&DATAPOST)==0)) ||
(((data[0x156] != c) && (dpost&0xFFFF00)!=0xDEAA00) && (((visualgrid[se][track]&DATAGOOD)==0)&&(visualgrid[se][track]&DATAPOST)==0))
) {
for(int i=0x56; i<0x156; i++) {
uint8_t dv = data[i];
*dest++ = dv;
}
}
}
#else
if ((visualgrid[se][track]&DATAGOOD)==0) {
for(int i=0x56; i<0x156; i++) {
uint8_t dv = data[i];
*dest++ = dv;
}
}
#endif
// do some checking
#ifdef VERBOSE_SAVE
if ((data[0x156] != c) || (dpost&0xFFFF00)!=0xDEAA00)
fprintf(stderr,"Data Mark:\tChecksum xpctd %d found %d: %s, Postamble %03X: %s\n", data[0x156], c, (data[0x156]==c)?"OK":"BAD", dpost, (dpost&0xFFFF00)==0xDEAA00?"OK":"BAD");
#endif
if (data[0x156] == c) visualgrid[se][track] |= DATAGOOD;
if ((dpost&0xFFFF00)==0xDEAA00) visualgrid[se][track] |= DATAPOST;
} else if ((hb == 4)&&(dosver == 1)) {
fprintf(stderr,"ERROR: We don't handle dos sectors below 3.3 yet!\n");
} else {
pos = opos;
wrap = owrap;
}
}
}
hb = 0;
}
if(wrap)
break;
}
for(int i=0; i<nsect; i++) {
//if(nsect>0) printf("t%d,", track);
uint8_t *data = sectdata + (256)*i;
io_generic_write(io, data, pos_data, 256);
pos_data += 256;
}
//printf("\n");
}
// display a little table of which sectors decoded ok
#ifdef VERBOSE_SAVE
int total_good = 0;
for (int j = 0; j < 35; j++) {
printf("T%2d: ",j);
for (int i = 0; i < 16; i++) {
if (visualgrid[i][j] == NOTFOUND) printf("-NF- ");
else {
if (visualgrid[i][j] & ADDRFOUND) printf("a"); else printf(" ");
if (visualgrid[i][j] & ADDRGOOD) printf("A"); else printf(" ");
if (visualgrid[i][j] & DATAFOUND) printf("d"); else printf(" ");
if (visualgrid[i][j] & DATAGOOD) { printf("D"); total_good++; } else printf(" ");
if (visualgrid[i][j] & DATAPOST) printf("."); else printf(" ");
}
}
printf("\n");
}
printf("Total Good Sectors: %d\n", total_good);
#endif
return true;
}
const floppy_format_type FLOPPY_A216S_FORMAT = &floppy_image_format_creator<a2_16sect_format>;
/* RWTS18 format
* Developed by Roland Gustafsson (http://www.acts.org/roland/index.html)
for Br0derbund Software around 1986
This format works as follows:
* Track 0, in its entirety, is a normal 16-sector track, nothing special.
(some disks may lack a normal sector 0 on this track, more info needed)
* Tracks 1 thru 34 are in the special "RWTS18" track format:
The format consists of six "large" sectors with 768 bytes each.
Each of those large sectors has a title-specific sync byte and contains
three "virtual" small sectors of 256 bytes, in an order like follows:
BigSector Contains
0: 0, 6, 12
1: 1, 7, 13
2: 2, 8, 14
3: 3, 9, 15