summaryrefslogtreecommitdiff
path: root/src/ppu.c
blob: cdd8048a36e46961a2a71fa6a0ef9db16b602d38 (plain)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
/*
 * Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
 *
 * (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
 *                           Jerremy Koot (jkoot@snes9x.com)
 *
 * Super FX C emulator code
 * (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) and
 *                           Gary Henderson.
 * Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
 *
 * DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
 * C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
 * C4 C code (c) Copyright 2001 Gary Henderson (gary.henderson@ntlworld.com).
 *
 * DOS port code contains the works of other authors. See headers in
 * individual files.
 *
 * Snes9x homepage: http://www.snes9x.com
 *
 * Permission to use, copy, modify and distribute Snes9x in both binary and
 * source form, for non-commercial purposes, is hereby granted without fee,
 * providing that this license information and copyright notice appear with
 * all copies and any derived work.
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event shall the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Snes9x is freeware for PERSONAL USE only. Commercial users should
 * seek permission of the copyright holders first. Commercial use includes
 * charging money for Snes9x or software derived from Snes9x.
 *
 * The copyright holders request that bug fixes and improvements to the code
 * should be forwarded to them so everyone can benefit from the modifications
 * in future versions.
 *
 * Super NES and Super Nintendo Entertainment System are trademarks of
 * Nintendo Co., Limited and its subsidiary companies.
 */
#include "snes9x.h"
#include "memmap.h"
#include "ppu.h"
#include "cpuexec.h"
#include "missing.h"
#include "apu.h"
#include "dma.h"
#include "gfx.h"
#include "display.h"
#include "sa1.h"
#include "sdd1.h"
#include "srtc.h"

#include "port.h"

#ifndef ZSNES_FX
#include "fxemu.h"
#include "fxinst.h"
extern FxInit_s SuperFX;
extern FxRegs_s GSU;
#else
EXTERN_C void S9xSuperFXWriteReg(uint8, uint32);
EXTERN_C uint8 S9xSuperFXReadReg(uint32);
#endif
extern uint8* HDMAMemPointers [8];

void S9xUpdateHTimer()
{
   if (PPU.HTimerEnabled)
   {
#ifdef DEBUGGER
      missing.hirq_pos = PPU.IRQHBeamPos;
#endif
      PPU.HTimerPosition = PPU.IRQHBeamPos * Settings.H_Max / SNES_HCOUNTER_MAX;
      if (PPU.HTimerPosition == Settings.H_Max ||
            PPU.HTimerPosition == Settings.HBlankStart)
         PPU.HTimerPosition--;

      if (!PPU.VTimerEnabled || CPU.V_Counter == PPU.IRQVBeamPos)
      {
         if (PPU.HTimerPosition < CPU.Cycles)
         {
            // Missed the IRQ on this line already
            if (CPU.WhichEvent == HBLANK_END_EVENT ||
                  CPU.WhichEvent == HTIMER_AFTER_EVENT)
            {
               CPU.WhichEvent = HBLANK_END_EVENT;
               CPU.NextEvent = Settings.H_Max;
            }
            else
            {
               CPU.WhichEvent = HBLANK_START_EVENT;
               CPU.NextEvent = Settings.HBlankStart;
            }
         }
         else
         {
            if (CPU.WhichEvent == HTIMER_BEFORE_EVENT ||
                  CPU.WhichEvent == HBLANK_START_EVENT)
            {
               if (PPU.HTimerPosition > Settings.HBlankStart)
               {
                  // HTimer was to trigger before h-blank start,
                  // now triggers after start of h-blank
                  CPU.NextEvent = Settings.HBlankStart;
                  CPU.WhichEvent = HBLANK_START_EVENT;
               }
               else
               {
                  CPU.NextEvent = PPU.HTimerPosition;
                  CPU.WhichEvent = HTIMER_BEFORE_EVENT;
               }
            }
            else
            {
               CPU.WhichEvent = HTIMER_AFTER_EVENT;
               CPU.NextEvent = PPU.HTimerPosition;
            }
         }
      }
   }
}

void S9xFixColourBrightness()
{
   IPPU.XB = mul_brightness [PPU.Brightness];
   if (Settings.SixteenBit)
   {
      unsigned int i;
      for (i = 0; i < 256; i++)
      {
         //IPPU.Red [i] = IPPU.XB [PPU.CGDATA [i] & 0x1f];
         //IPPU.Green [i] = IPPU.XB [(PPU.CGDATA [i] >> 5) & 0x1f];
         //IPPU.Blue [i] = IPPU.XB [(PPU.CGDATA [i] >> 10) & 0x1f];
         IPPU.ScreenColors [i] = BUILD_PIXEL(IPPU.XB[IPPU.Red [i]], IPPU.XB[IPPU.Green [i]], IPPU.XB[IPPU.Blue [i]]);
      }
   }
}

/**********************************************************************************************/
/* S9xSetPPU()                                                                                   */
/* This function sets a PPU Register to a specific byte                                       */
/**********************************************************************************************/
#include "ppu_setppu.h"

/**********************************************************************************************/
/* S9xGetPPU()                                                                                   */
/* This function retrieves a PPU Register                                                     */
/**********************************************************************************************/
#include "ppu_getppu.h"

/**********************************************************************************************/
/* S9xSetCPU()                                                                                   */
/* This function sets a CPU/DMA Register to a specific byte                                   */
/**********************************************************************************************/
void S9xSetCPU(uint8 byte, uint16 Address)
{
   int d;

   if (Address < 0x4200)
   {
#ifdef VAR_CYCLES
      CPU.Cycles += ONE_CYCLE;
#endif
      switch (Address)
      {
      case 0x4016 :
         // S9xReset reading of old-style joypads
         if ((byte & 1) && !(Memory.FillRAM[Address] & 1))
         {
            PPU.Joypad1ButtonReadPos = 0;
            PPU.Joypad2ButtonReadPos = 0;
            PPU.Joypad3ButtonReadPos = 0;
         }
         break;
      case 0x4017 :
         break;
      default :
#ifdef DEBUGGER
         missing.unknowncpu_write = Address;
         if (Settings.TraceUnknownRegisters)
         {
            sprintf(String, "Unknown register register write: $%02X->$%04X\n", byte, Address);
            S9xMessage(S9X_TRACE, S9X_PPU_TRACE, String);
         }
#endif
         break;
      }
   }
   else
      switch (Address)
      {
      case 0x4200 :
         // NMI, V & H IRQ and joypad reading enable flags
         if (byte & 0x20)
         {
            if (!PPU.VTimerEnabled)
            {
#ifdef DEBUGGER
               missing.virq = 1;
               missing.virq_pos = PPU.IRQVBeamPos;
#endif
               PPU.VTimerEnabled = TRUE;
               if (PPU.HTimerEnabled)
                  S9xUpdateHTimer();
               else if (PPU.IRQVBeamPos == CPU.V_Counter)
                  S9xSetIRQ(PPU_V_BEAM_IRQ_SOURCE);
            }
         }
         else
            PPU.VTimerEnabled = FALSE;

         if (byte & 0x10)
         {
            if (!PPU.HTimerEnabled)
            {
#ifdef DEBUGGER
               missing.hirq = 1;
               missing.hirq_pos = PPU.IRQHBeamPos;
#endif
               PPU.HTimerEnabled = TRUE;
               S9xUpdateHTimer();
            }
         }
         else
         {
            // No need to check for HTimer being disabled as the scanline
            // event trigger code won't trigger an H-IRQ unless its enabled.
            PPU.HTimerEnabled = FALSE;
            PPU.HTimerPosition = Settings.H_Max + 1;
         }

#ifndef RC_OPTIMIZED
         if (!Settings.DaffyDuck)
            CLEAR_IRQ_SOURCE(PPU_V_BEAM_IRQ_SOURCE | PPU_H_BEAM_IRQ_SOURCE);

         if ((byte & 0x80)
               && !(Memory.FillRAM[0x4200] & 0x80)
               && CPU.V_Counter >= PPU.ScreenHeight + FIRST_VISIBLE_LINE
               && CPU.V_Counter <= PPU.ScreenHeight + (SNESGameFixes.alienVSpredetorFix ? 25 : 15)
               && //jyam 15->25 alien vs predetor
               // Panic Bomberman clears the NMI pending flag @ scanline 230 before enabling
               // NMIs again. The NMI routine crashes the CPU if it is called without the NMI
               // pending flag being set...
               (Memory.FillRAM[0x4210] & 0x80) && !CPU.NMIActive)
         {
            CPU.Flags |= NMI_FLAG;
            CPU.NMIActive = TRUE;
            CPU.NMICycleCount = CPU.NMITriggerPoint;
         }
#endif
         break;
      case 0x4201 :
      // I/O port output
      case 0x4202 :
         // Multiplier (for multply)
         break;
      case 0x4203 :
      {
         // Multiplicand
         uint32 res = Memory.FillRAM[0x4202] * byte;

         Memory.FillRAM[0x4216] = (uint8) res;
         Memory.FillRAM[0x4217] = (uint8)(res >> 8);
         break;
      }
      case 0x4204 :
      case 0x4205 :
         // Low and high muliplier (for divide)
         break;
      case 0x4206 :
      {
         // Divisor
         uint16 a =
            Memory.FillRAM[0x4204] + (Memory.FillRAM[0x4205] << 8);
         uint16 div = byte ? a / byte : 0xffff;
         uint16 rem = byte ? a % byte : a;

         Memory.FillRAM[0x4214] = (uint8) div;
         Memory.FillRAM[0x4215] = div >> 8;
         Memory.FillRAM[0x4216] = (uint8) rem;
         Memory.FillRAM[0x4217] = rem >> 8;
         break;
      }
      case 0x4207 :
         d = PPU.IRQHBeamPos;
         PPU.IRQHBeamPos = (PPU.IRQHBeamPos & 0xFF00) | byte;

         if (PPU.HTimerEnabled && PPU.IRQHBeamPos != d)
            S9xUpdateHTimer();
         break;

      case 0x4208 :
         d = PPU.IRQHBeamPos;
         PPU.IRQHBeamPos = (PPU.IRQHBeamPos & 0xFF) | ((byte & 1) << 8);

         if (PPU.HTimerEnabled && PPU.IRQHBeamPos != d)
            S9xUpdateHTimer();

         break;

      case 0x4209 :
         d = PPU.IRQVBeamPos;
         PPU.IRQVBeamPos = (PPU.IRQVBeamPos & 0xFF00) | byte;
#ifdef DEBUGGER
         missing.virq_pos = PPU.IRQVBeamPos;
#endif
         if (PPU.VTimerEnabled && PPU.IRQVBeamPos != d)
         {
            if (PPU.HTimerEnabled)
               S9xUpdateHTimer();
            else
            {
               if (PPU.IRQVBeamPos == CPU.V_Counter)
                  S9xSetIRQ(PPU_V_BEAM_IRQ_SOURCE);
            }
         }
         break;

      case 0x420A :
         d = PPU.IRQVBeamPos;
         PPU.IRQVBeamPos = (PPU.IRQVBeamPos & 0xFF) | ((byte & 1) << 8);
#ifdef DEBUGGER
         missing.virq_pos = PPU.IRQVBeamPos;
#endif
         if (PPU.VTimerEnabled && PPU.IRQVBeamPos != d)
         {
            if (PPU.HTimerEnabled)
               S9xUpdateHTimer();
            else
            {
               if (PPU.IRQVBeamPos == CPU.V_Counter)
                  S9xSetIRQ(PPU_V_BEAM_IRQ_SOURCE);
            }
         }
         break;

      case 0x420B :
#ifdef DEBUGGER
         missing.dma_this_frame = byte;
         missing.dma_channels = byte;
#endif
         if ((byte & 0x01) != 0)
            S9xDoDMA(0);
         if ((byte & 0x02) != 0)
            S9xDoDMA(1);
         if ((byte & 0x04) != 0)
            S9xDoDMA(2);
         if ((byte & 0x08) != 0)
            S9xDoDMA(3);
         if ((byte & 0x10) != 0)
            S9xDoDMA(4);
         if ((byte & 0x20) != 0)
            S9xDoDMA(5);
         if ((byte & 0x40) != 0)
            S9xDoDMA(6);
         if ((byte & 0x80) != 0)
            S9xDoDMA(7);
         break;
      case 0x420C :
#ifdef DEBUGGER
         missing.hdma_this_frame |= byte;
         missing.hdma_channels |= byte;
#endif
         //if (Settings.DisableHDMA)
         // byte = 0;
         Memory.FillRAM[0x420c] = byte;
         IPPU.HDMA = byte;
         break;

      case 0x420d :
         // Cycle speed 0 - 2.68Mhz, 1 - 3.58Mhz (banks 0x80 +)
         if ((byte & 1) != (Memory.FillRAM[0x420d] & 1))
         {
            if (byte & 1)
            {
               CPU.FastROMSpeed = ONE_CYCLE;
#ifdef DEBUGGER
               missing.fast_rom = 1;
#endif
            }
            else
               CPU.FastROMSpeed = SLOW_ONE_CYCLE;

            FixROMSpeed();
         }
      /* FALL */
      case 0x420e :
      case 0x420f :
         // --->>> Unknown
         break;
      case 0x4210 :
         // NMI ocurred flag (reset on read or write)
         Memory.FillRAM[0x4210] = 0;
         return;
      case 0x4211 :
         // IRQ ocurred flag (reset on read or write)
         CLEAR_IRQ_SOURCE(PPU_V_BEAM_IRQ_SOURCE | PPU_H_BEAM_IRQ_SOURCE);
         break;
      case 0x4212 :
      // v-blank, h-blank and joypad being scanned flags (read-only)
      case 0x4213 :
      // I/O Port (read-only)
      case 0x4214 :
      case 0x4215 :
      // Quotent of divide (read-only)
      case 0x4216 :
      case 0x4217 :
         // Multiply product (read-only)
         return;
      case 0x4218 :
      case 0x4219 :
      case 0x421a :
      case 0x421b :
      case 0x421c :
      case 0x421d :
      case 0x421e :
      case 0x421f :
         // Joypad values (read-only)
         return;

      case 0x4300 :
      case 0x4310 :
      case 0x4320 :
      case 0x4330 :
      case 0x4340 :
      case 0x4350 :
      case 0x4360 :
      case 0x4370 :
         d = (Address >> 4) & 0x7;
         DMA[d].TransferDirection = (byte & 128) != 0 ? 1 : 0;
         DMA[d].HDMAIndirectAddressing = (byte & 64) != 0 ? 1 : 0;
         DMA[d].AAddressDecrement = (byte & 16) != 0 ? 1 : 0;
         DMA[d].AAddressFixed = (byte & 8) != 0 ? 1 : 0;
         DMA[d].TransferMode = (byte & 7);
         break;

      case 0x4301 :
      case 0x4311 :
      case 0x4321 :
      case 0x4331 :
      case 0x4341 :
      case 0x4351 :
      case 0x4361 :
      case 0x4371 :
         DMA[((Address >> 4) & 0x7)].BAddress = byte;
         break;

      case 0x4302 :
      case 0x4312 :
      case 0x4322 :
      case 0x4332 :
      case 0x4342 :
      case 0x4352 :
      case 0x4362 :
      case 0x4372 :
         d = (Address >> 4) & 0x7;
         DMA[d].AAddress &= 0xFF00;
         DMA[d].AAddress |= byte;
         break;

      case 0x4303 :
      case 0x4313 :
      case 0x4323 :
      case 0x4333 :
      case 0x4343 :
      case 0x4353 :
      case 0x4363 :
      case 0x4373 :
         d = (Address >> 4) & 0x7;
         DMA[d].AAddress &= 0xFF;
         DMA[d].AAddress |= byte << 8;
         break;

      case 0x4304 :
      case 0x4314 :
      case 0x4324 :
      case 0x4334 :
      case 0x4344 :
      case 0x4354 :
      case 0x4364 :
      case 0x4374 :
         DMA[((Address >> 4) & 0x7)].ABank = byte;
         HDMAMemPointers[((Address >> 4) & 0x7)] = NULL;
         break;

      case 0x4305 :
      case 0x4315 :
      case 0x4325 :
      case 0x4335 :
      case 0x4345 :
      case 0x4355 :
      case 0x4365 :
      case 0x4375 :
         d = (Address >> 4) & 0x7;
         DMA[d].TransferBytes &= 0xFF00;
         DMA[d].TransferBytes |= byte;
         DMA[d].IndirectAddress &= 0xff00;
         DMA[d].IndirectAddress |= byte;
         HDMAMemPointers[d] = NULL;
         break;

      case 0x4306 :
      case 0x4316 :
      case 0x4326 :
      case 0x4336 :
      case 0x4346 :
      case 0x4356 :
      case 0x4366 :
      case 0x4376 :
         d = (Address >> 4) & 0x7;
         DMA[d].TransferBytes &= 0xFF;
         DMA[d].TransferBytes |= byte << 8;
         DMA[d].IndirectAddress &= 0xff;
         DMA[d].IndirectAddress |= byte << 8;
         HDMAMemPointers[d] = NULL;
         break;

      case 0x4307 :
      case 0x4317 :
      case 0x4327 :
      case 0x4337 :
      case 0x4347 :
      case 0x4357 :
      case 0x4367 :
      case 0x4377 :
         DMA[d = ((Address >> 4) & 0x7)].IndirectBank = byte;
         HDMAMemPointers[d] = NULL;
         break;

      case 0x4308 :
      case 0x4318 :
      case 0x4328 :
      case 0x4338 :
      case 0x4348 :
      case 0x4358 :
      case 0x4368 :
      case 0x4378 :
         d = (Address >> 4) & 7;
         DMA[d].Address &= 0xff00;
         DMA[d].Address |= byte;
         HDMAMemPointers[d] = NULL;
         break;

      case 0x4309 :
      case 0x4319 :
      case 0x4329 :
      case 0x4339 :
      case 0x4349 :
      case 0x4359 :
      case 0x4369 :
      case 0x4379 :
         d = (Address >> 4) & 0x7;
         DMA[d].Address &= 0xff;
         DMA[d].Address |= byte << 8;
         HDMAMemPointers[d] = NULL;
         break;

      case 0x430A :
      case 0x431A :
      case 0x432A :
      case 0x433A :
      case 0x434A :
      case 0x435A :
      case 0x436A :
      case 0x437A :
         d = (Address >> 4) & 0x7;
         DMA[d].LineCount = byte & 0x7f;
         DMA[d].Repeat = !(byte & 0x80);
         break;

      case 0x430F:
      case 0x431F:
      case 0x432F:
      case 0x433F:
      case 0x434F:
      case 0x435F:
      case 0x436F:
      case 0x437F:
         Address &= ~4; // Convert 43xF to 43xB
      /* fall through */
      case 0x430B:
      case 0x431B:
      case 0x432B:
      case 0x433B:
      case 0x434B:
      case 0x435B:
      case 0x436B:
      case 0x437B:

         // Unknown, but they seem to be RAM-ish
         break;
      case 0x4800 :
      case 0x4801 :
      case 0x4802 :
      case 0x4803 :
         //printf ("%02x->%04x\n", byte, Address);
         break;

      case 0x4804 :
      case 0x4805 :
      case 0x4806 :
      case 0x4807 :
         //printf ("%02x->%04x\n", byte, Address);

         S9xSetSDD1MemoryMap(Address - 0x4804, byte & 7);
         break;
      default :
#ifdef DEBUGGER
         missing.unknowncpu_write = Address;
         if (Settings.TraceUnknownRegisters)
         {
            sprintf(
               String,
               "Unknown register write: $%02X->$%04X\n",
               byte,
               Address);
            S9xMessage(S9X_TRACE, S9X_PPU_TRACE, String);
         }
#endif
         break;
      }
   Memory.FillRAM[Address] = byte;
}

/**********************************************************************************************/
/* S9xGetCPU()                                                                                   */
/* This function retrieves a CPU/DMA Register                                                 */
/**********************************************************************************************/
uint8 S9xGetCPU(uint16 Address)
{
   uint8 byte;
   if (Address >= 0x4800 && Address <= 0x4807 && Settings.SDD1)
      return Memory.FillRAM[Address];

   if (Address < 0x4200)
   {
#ifdef VAR_CYCLES
      CPU.Cycles += ONE_CYCLE;
#endif
      switch (Address)
      {
      // Secret of the Evermore
      case 0x4000 :
      case 0x4001 :
         return (0x40);

      case 0x4016 :
      {
         if (Memory.FillRAM[0x4016] & 1)
            return (0);

         byte = IPPU.Joypads[0] >> (PPU.Joypad1ButtonReadPos ^ 15);
         PPU.Joypad1ButtonReadPos++;
         return (byte & 1);
      }
      case 0x4017 :
      {
         if (Memory.FillRAM[0x4016] & 1)
         {
            // MultiPlayer5 adaptor is only allowed to be plugged into port 2
            switch (IPPU.Controller)
            {
            case SNES_MULTIPLAYER5 :
               return (2);

            case SNES_MOUSE :
               if (++PPU.MouseSpeed[0] > 2)
                  PPU.MouseSpeed[0] = 0;
               break;
            }
            return (0x00);
         }

         if (IPPU.Controller == SNES_MULTIPLAYER5)
         {
            if (Memory.FillRAM[0x4201] & 0x80)
            {
               byte =
                  ((IPPU.Joypads[0]
                    >> (PPU.Joypad2ButtonReadPos ^ 15))
                   & 1)
                  | (((IPPU.Joypads[2]
                       >> (PPU.Joypad2ButtonReadPos ^ 15))
                      & 1)
                     << 1);
               PPU.Joypad2ButtonReadPos++;
               return (byte);
            }
            else
            {
               byte =
                  ((IPPU.Joypads[3]
                    >> (PPU.Joypad3ButtonReadPos ^ 15))
                   & 1)
                  | (((IPPU.Joypads[4]
                       >> (PPU.Joypad3ButtonReadPos ^ 15))
                      & 1)
                     << 1);
               PPU.Joypad3ButtonReadPos++;
               return (byte);
            }
         }
         return (
                   (IPPU.Joypads[1]
                    >> (PPU.Joypad2ButtonReadPos++ ^ 15))
                   & 1);
      }
      default :
#ifdef DEBUGGER
         missing.unknowncpu_read = Address;
         if (Settings.TraceUnknownRegisters)
         {
            sprintf(String, "Unknown register read: $%04X\n", Address);
            S9xMessage(S9X_TRACE, S9X_PPU_TRACE, String);
         }
#endif
         break;
      }
      return (Memory.FillRAM[Address]);
   }
   else
      switch (Address)
      {
      // BS Dynami Tracer! needs to be able to check if NMIs are enabled
      // already, otherwise the game locks up.
      case 0x4200 :
         // NMI, h & v timers and joypad reading enable
         if (SNESGameFixes.Old_Read0x4200)
         {
#ifdef CPU_SHUTDOWN
            CPU.WaitAddress = CPU.PCAtOpcodeStart;
#endif
            return (REGISTER_4212());
         }
      case 0x4201 :
      // I/O port (output - write only?)
      case 0x4202 :
      case 0x4203 :
      // Multiplier and multiplicand (write)
      case 0x4204 :
      case 0x4205 :
      case 0x4206 :
         // Divisor and dividend (write)
         return (Memory.FillRAM[Address]);
      case 0x4207 :
         return (uint8)(PPU.IRQHBeamPos);
      case 0x4208 :
         return (PPU.IRQHBeamPos >> 8);
      case 0x4209 :
         return (uint8)(PPU.IRQVBeamPos);
      case 0x420a :
         return (PPU.IRQVBeamPos >> 8);
      case 0x420b :
         // General purpose DMA enable
         // Super Formation Soccer 95 della Serie A UCC Xaqua requires this
         // register should not always return zero.
         // .. But Aero 2 waits until this register goes zero..
         // Just keep toggling the value for now in the hope that it breaks
         // the game out of its wait loop...
         Memory.FillRAM[0x420b] = !Memory.FillRAM[0x420b];
         return (Memory.FillRAM[0x420b]);
      case 0x420c :
         // H-DMA enable
         return (IPPU.HDMA);
      case 0x420d :
         // Cycle speed 0 - 2.68Mhz, 1 - 3.58Mhz (banks 0x80 +)
         return (Memory.FillRAM[Address]);
      case 0x420e :
      case 0x420f :
         // --->>> Unknown
         return (Memory.FillRAM[Address]);
      case 0x4210 :
#ifdef CPU_SHUTDOWN
         CPU.WaitAddress = CPU.PCAtOpcodeStart;
#endif
         byte = Memory.FillRAM[0x4210];
         Memory.FillRAM[0x4210] = 0;
         return (byte);
      case 0x4211 :
         byte =
            (CPU.IRQActive
             & (PPU_V_BEAM_IRQ_SOURCE | PPU_H_BEAM_IRQ_SOURCE))
            ? 0x80
            : 0;
         // Super Robot Wars Ex ROM bug requires this.
         byte |= CPU.Cycles >= Settings.HBlankStart ? 0x40 : 0;
         CLEAR_IRQ_SOURCE(PPU_V_BEAM_IRQ_SOURCE | PPU_H_BEAM_IRQ_SOURCE);
         return (byte);
      case 0x4212 :
         // V-blank, h-blank and joypads being read flags (read-only)
#ifdef CPU_SHUTDOWN
         CPU.WaitAddress = CPU.PCAtOpcodeStart;
#endif
         return (REGISTER_4212());
      case 0x4213 :
      // I/O port input
      case 0x4214 :
      case 0x4215 :
      // Quotient of divide result
      case 0x4216 :
      case 0x4217 :
         // Multiplcation result (for multiply) or remainder of
         // divison.
         return (Memory.FillRAM[Address]);
      case 0x4218 :
      case 0x4219 :
      case 0x421a :
      case 0x421b :
      case 0x421c :
      case 0x421d :
      case 0x421e :
      case 0x421f :
         // Joypads 1-4 button and direction state.
         return (Memory.FillRAM[Address]);

      case 0x4300 :
      case 0x4310 :
      case 0x4320 :
      case 0x4330 :
      case 0x4340 :
      case 0x4350 :
      case 0x4360 :
      case 0x4370 :
         // DMA direction, address type, fixed flag,
         return (Memory.FillRAM[Address]);

      case 0x4301 :
      case 0x4311 :
      case 0x4321 :
      case 0x4331 :
      case 0x4341 :
      case 0x4351 :
      case 0x4361 :
      case 0x4371 :
         return (Memory.FillRAM[Address]);

      case 0x4302 :
      case 0x4312 :
      case 0x4322 :
      case 0x4332 :
      case 0x4342 :
      case 0x4352 :
      case 0x4362 :
      case 0x4372 :
         return (Memory.FillRAM[Address]);

      case 0x4303 :
      case 0x4313 :
      case 0x4323 :
      case 0x4333 :
      case 0x4343 :
      case 0x4353 :
      case 0x4363 :
      case 0x4373 :
         return (Memory.FillRAM[Address]);

      case 0x4304 :
      case 0x4314 :
      case 0x4324 :
      case 0x4334 :
      case 0x4344 :
      case 0x4354 :
      case 0x4364 :
      case 0x4374 :
         return (Memory.FillRAM[Address]);

      case 0x4305 :
      case 0x4315 :
      case 0x4325 :
      case 0x4335 :
      case 0x4345 :
      case 0x4355 :
      case 0x4365 :
      case 0x4375 :
         return (Memory.FillRAM[Address]);

      case 0x4306 :
      case 0x4316 :
      case 0x4326 :
      case 0x4336 :
      case 0x4346 :
      case 0x4356 :
      case 0x4366 :
      case 0x4376 :
         return (Memory.FillRAM[Address]);

      case 0x4307 :
      case 0x4317 :
      case 0x4327 :
      case 0x4337 :
      case 0x4347 :
      case 0x4357 :
      case 0x4367 :
      case 0x4377 :
         return (DMA[(Address >> 4) & 7].IndirectBank);

      case 0x4308 :
      case 0x4318 :
      case 0x4328 :
      case 0x4338 :
      case 0x4348 :
      case 0x4358 :
      case 0x4368 :
      case 0x4378 :
         return (Memory.FillRAM[Address]);

      case 0x4309 :
      case 0x4319 :
      case 0x4329 :
      case 0x4339 :
      case 0x4349 :
      case 0x4359 :
      case 0x4369 :
      case 0x4379 :
         return (Memory.FillRAM[Address]);

      case 0x430A :
      case 0x431A :
      case 0x432A :
      case 0x433A :
      case 0x434A :
      case 0x435A :
      case 0x436A :
      case 0x437A :
      {
         int d = (Address & 0x70) >> 4;
         if (IPPU.HDMA & (1 << d))
            return (DMA[d].LineCount);
         return (Memory.FillRAM[Address]);
      }
      case 0x430F:
      case 0x431F:
      case 0x432F:
      case 0x433F:
      case 0x434F:
      case 0x435F:
      case 0x436F:
      case 0x437F:
         Address &= ~4; // Convert 43xF to 43xB
      /* fall through */
      case 0x430B:
      case 0x431B:
      case 0x432B:
      case 0x433B:
      case 0x434B:
      case 0x435B:
      case 0x436B:
      case 0x437B:

         // Unknown, but they seem to be RAM-ish
         return (Memory.FillRAM[Address]);
      default :
#ifdef DEBUGGER
         missing.unknowncpu_read = Address;
         if (Settings.TraceUnknownRegisters)
         {
            sprintf(String, "Unknown register read: $%04X\n", Address);
            S9xMessage(S9X_TRACE, S9X_PPU_TRACE, String);
         }

#endif
         break;
      }
   return (Memory.FillRAM[Address]);
}

void S9xResetPPU()
{
   PPU.BGMode = 0;
   PPU.BG3Priority = 0;
   PPU.Brightness = 0;
   PPU.VMA.High = 0;
   PPU.VMA.Increment = 1;
   PPU.VMA.Address = 0;
   PPU.VMA.FullGraphicCount = 0;
   PPU.VMA.Shift = 0;

   uint8 B;
   for (B = 0; B != 4; B++)
   {
      PPU.BG[B].SCBase = 0;
      PPU.BG[B].VOffset = 0;
      PPU.BG[B].HOffset = 0;
      PPU.BG[B].BGSize = 0;
      PPU.BG[B].NameBase = 0;
      PPU.BG[B].SCSize = 0;

      PPU.ClipCounts[B] = 0;
      PPU.ClipWindowOverlapLogic[B] = CLIP_OR;
      PPU.ClipWindow1Enable[B] = FALSE;
      PPU.ClipWindow2Enable[B] = FALSE;
      PPU.ClipWindow1Inside[B] = TRUE;
      PPU.ClipWindow2Inside[B] = TRUE;
   }

   PPU.ClipCounts[4] = 0;
   PPU.ClipCounts[5] = 0;
   PPU.ClipWindowOverlapLogic[4] = PPU.ClipWindowOverlapLogic[5] = CLIP_OR;
   PPU.ClipWindow1Enable[4] = PPU.ClipWindow1Enable[5] = FALSE;
   PPU.ClipWindow2Enable[4] = PPU.ClipWindow2Enable[5] = FALSE;
   PPU.ClipWindow1Inside[4] = PPU.ClipWindow1Inside[5] = TRUE;
   PPU.ClipWindow2Inside[4] = PPU.ClipWindow2Inside[5] = TRUE;

   PPU.CGFLIP = 0;
   unsigned int c;
   for (c = 0; c < 256; c++)
   {
      IPPU.Red[c] = (c & 7) << 2;
      IPPU.Green[c] = ((c >> 3) & 7) << 2;
      IPPU.Blue[c] = ((c >> 6) & 2) << 3;
      PPU.CGDATA[c] =
         IPPU.Red[c] | (IPPU.Green[c] << 5) | (IPPU.Blue[c] << 10);
   }

   PPU.FirstSprite = 0;
   PPU.LastSprite = 127;
   int Sprite;
   for (Sprite = 0; Sprite < 128; Sprite++)
   {
      PPU.OBJ[Sprite].HPos = 0;
      PPU.OBJ[Sprite].VPos = 0;
      PPU.OBJ[Sprite].VFlip = 0;
      PPU.OBJ[Sprite].HFlip = 0;
      PPU.OBJ[Sprite].Priority = 0;
      PPU.OBJ[Sprite].Palette = 0;
      PPU.OBJ[Sprite].Name = 0;
      PPU.OBJ[Sprite].Size = 0;
   }
   PPU.OAMPriorityRotation = 0;
   PPU.OAMWriteRegister = 0;

   PPU.OAMFlip = 0;
   PPU.OAMTileAddress = 0;
   PPU.OAMAddr = 0;
   PPU.IRQVBeamPos = 0;
   PPU.IRQHBeamPos = 0;
   PPU.VBeamPosLatched = 0;
   PPU.HBeamPosLatched = 0;

   PPU.HBeamFlip = 0;
   PPU.VBeamFlip = 0;
   PPU.HVBeamCounterLatched = 0;

   PPU.MatrixA = PPU.MatrixB = PPU.MatrixC = PPU.MatrixD = 0;
   PPU.CentreX = PPU.CentreY = 0;
   PPU.Joypad1ButtonReadPos = 0;
   PPU.Joypad2ButtonReadPos = 0;
   PPU.Joypad3ButtonReadPos = 0;

   PPU.CGADD = 0;
   PPU.FixedColourRed = PPU.FixedColourGreen = PPU.FixedColourBlue = 0;
   PPU.SavedOAMAddr = 0;
   PPU.SavedOAMAddr2 = 0;
   PPU.ScreenHeight = SNES_HEIGHT;
   PPU.WRAM = 0;
   PPU.BG_Forced = 0;
   PPU.ForcedBlanking = TRUE;
   PPU.OBJThroughMain = FALSE;
   PPU.OBJThroughSub = FALSE;
   PPU.OBJSizeSelect = 0;
   PPU.OBJNameSelect = 0;
   PPU.OBJNameBase = 0;
   PPU.OBJAddition = FALSE;
   PPU.OAMReadFlip = 0;
   PPU.BGnxOFSbyte = 0;
   ZeroMemory(PPU.OAMData, 512 + 32);

   PPU.VTimerEnabled = FALSE;
   PPU.HTimerEnabled = FALSE;
   PPU.HTimerPosition = Settings.H_Max + 1;
   PPU.Mosaic = 0;
   PPU.BGMosaic[0] = PPU.BGMosaic[1] = FALSE;
   PPU.BGMosaic[2] = PPU.BGMosaic[3] = FALSE;
   PPU.Mode7HFlip = FALSE;
   PPU.Mode7VFlip = FALSE;
   PPU.Mode7Repeat = 0;
   PPU.Window1Left = 1;
   PPU.Window1Right = 0;
   PPU.Window2Left = 1;
   PPU.Window2Right = 0;
   PPU.RecomputeClipWindows = TRUE;
   PPU.CGFLIPRead = 0;
   PPU.Need16x8Mulitply = FALSE;
   PPU.MouseSpeed[0] = PPU.MouseSpeed[1] = 0;

   IPPU.ColorsChanged = TRUE;
   IPPU.HDMA = 0;
   IPPU.HDMAStarted = FALSE;
   IPPU.MaxBrightness = 0;
   IPPU.LatchedBlanking = 0;
   IPPU.OBJChanged = TRUE;
   IPPU.RenderThisFrame = TRUE;
   IPPU.DirectColourMapsNeedRebuild = TRUE;
   IPPU.FrameCount = 0;
   IPPU.RenderedFramesCount = 0;
   IPPU.DisplayedRenderedFrameCount = 0;
   IPPU.SkippedFrames = 0;
   IPPU.FrameSkip = 0;
   ZeroMemory(IPPU.TileCached[TILE_2BIT], MAX_2BIT_TILES);
   ZeroMemory(IPPU.TileCached[TILE_4BIT], MAX_4BIT_TILES);
   ZeroMemory(IPPU.TileCached[TILE_8BIT], MAX_8BIT_TILES);
   IPPU.FirstVRAMRead = FALSE;
   IPPU.LatchedInterlace = FALSE;
   IPPU.DoubleWidthPixels = FALSE;
   IPPU.RenderedScreenWidth = SNES_WIDTH;
   IPPU.RenderedScreenHeight = SNES_HEIGHT;
   IPPU.XB = NULL;
   for (c = 0; c < 256; c++)
      IPPU.ScreenColors[c] = c;
   S9xFixColourBrightness();
   IPPU.PreviousLine = IPPU.CurrentLine = 0;
   IPPU.Joypads[0] = IPPU.Joypads[1] = IPPU.Joypads[2] = 0;
   IPPU.Joypads[3] = IPPU.Joypads[4] = 0;
   IPPU.SuperScope = 0;
   IPPU.Mouse[0] = IPPU.Mouse[1] = 0;
   IPPU.PrevMouseX[0] = IPPU.PrevMouseX[1] = 256 / 2;
   IPPU.PrevMouseY[0] = IPPU.PrevMouseY[1] = 224 / 2;

   if (Settings.ControllerOption == 0)
      IPPU.Controller = SNES_MAX_CONTROLLER_OPTIONS - 1;
   else
      IPPU.Controller = Settings.ControllerOption - 1;
   S9xNextController();

   for (c = 0; c < 2; c++)
      memset(& IPPU.Clip[c], 0, sizeof(ClipData));

   if (Settings.MouseMaster)
   {
      S9xProcessMouse(0);
      S9xProcessMouse(1);
   }
   for (c = 0; c < 0x8000; c += 0x100)
      memset(& Memory.FillRAM[c], c >> 8, 0x100);

   ZeroMemory(& Memory.FillRAM[0x2100], 0x100);
   ZeroMemory(& Memory.FillRAM[0x4200], 0x100);
   ZeroMemory(& Memory.FillRAM[0x4000], 0x100);
   // For BS Suttehakkun 2...
   ZeroMemory(& Memory.FillRAM[0x1000], 0x1000);
   Memory.FillRAM[0x4201] = Memory.FillRAM[0x4213] = 0xFF;

   PPU.BG[0].OffsetsChanged = 0;
   PPU.BG[1].OffsetsChanged = 0;
   PPU.BG[2].OffsetsChanged = 0;
   PPU.BG[3].OffsetsChanged = 0;
   ROpCount = 0;
   ZeroMemory(&rops, MAX_ROPS);
   GFX.r212c_s = 0;
   GFX.r212d_s = 0;
   GFX.r212e_s = 0;
   GFX.r212f_s = 0;
   GFX.r2130_s = 0;
   GFX.r2131_s = 0;
}

void S9xProcessMouse(int which1)
{
   int x, y;
   uint32 buttons;

   if ((IPPU.Controller == SNES_MOUSE
         || IPPU.Controller == SNES_MOUSE_SWAPPED)
         && S9xReadMousePosition(which1, &x, &y, &buttons))
   {
      int delta_x, delta_y;
#define MOUSE_SIGNATURE 0x1
      IPPU.Mouse[which1] =
         MOUSE_SIGNATURE
         | (PPU.MouseSpeed[which1] << 4)
         | ((buttons & 1) << 6)
         | ((buttons & 2) << 6);

      delta_x = x - IPPU.PrevMouseX[which1];
      delta_y = y - IPPU.PrevMouseY[which1];

      if (delta_x > 63)
      {
         delta_x = 63;
         IPPU.PrevMouseX[which1] += 63;
      }
      else if (delta_x < -63)
      {
         delta_x = -63;
         IPPU.PrevMouseX[which1] -= 63;
      }
      else
         IPPU.PrevMouseX[which1] = x;

      if (delta_y > 63)
      {
         delta_y = 63;
         IPPU.PrevMouseY[which1] += 63;
      }
      else if (delta_y < -63)
      {
         delta_y = -63;
         IPPU.PrevMouseY[which1] -= 63;
      }
      else
         IPPU.PrevMouseY[which1] = y;

      if (delta_x < 0)
      {
         delta_x = -delta_x;
         IPPU.Mouse[which1] |= (delta_x | 0x80) << 16;
      }
      else
         IPPU.Mouse[which1] |= delta_x << 16;

      if (delta_y < 0)
      {
         delta_y = -delta_y;
         IPPU.Mouse[which1] |= (delta_y | 0x80) << 24;
      }
      else
         IPPU.Mouse[which1] |= delta_y << 24;

      if (IPPU.Controller == SNES_MOUSE_SWAPPED)
         IPPU.Joypads[0] = IPPU.Mouse[which1];
      else
         IPPU.Joypads[1] = IPPU.Mouse[which1];
   }
}

void ProcessSuperScope()
{
   int x, y;
   uint32 buttons;

   if (IPPU.Controller == SNES_SUPERSCOPE
         && S9xReadSuperScopePosition(&x, &y, &buttons))
   {
#define SUPERSCOPE_SIGNATURE 0x00ff
      uint32 scope;

      scope =
         SUPERSCOPE_SIGNATURE
         | ((buttons & 1) << (7 + 8))
         | ((buttons & 2) << (5 + 8))
         | ((buttons & 4) << (3 + 8))
         | ((buttons & 8) << (1 + 8));
      if (x > 255)
         x = 255;
      if (x < 0)
         x = 0;
      if (y > PPU.ScreenHeight - 1)
         y = PPU.ScreenHeight - 1;
      if (y < 0)
         y = 0;

      PPU.VBeamPosLatched = (uint16)(y + 1);
      PPU.HBeamPosLatched = (uint16) x;
      PPU.HVBeamCounterLatched = TRUE;
      Memory.FillRAM[0x213F] |= 0x40;
      IPPU.Joypads[1] = scope;
   }
}

void S9xNextController()
{
   switch (IPPU.Controller)
   {
   case SNES_MULTIPLAYER5 :
      IPPU.Controller = SNES_JOYPAD;
      break;
   case SNES_JOYPAD :
      if (Settings.MouseMaster)
      {
         IPPU.Controller = SNES_MOUSE_SWAPPED;
         break;
      }
   case SNES_MOUSE_SWAPPED :
      if (Settings.MouseMaster)
      {
         IPPU.Controller = SNES_MOUSE;
         break;
      }
   case SNES_MOUSE :
      if (Settings.SuperScopeMaster)
      {
         IPPU.Controller = SNES_SUPERSCOPE;
         break;
      }
   case SNES_SUPERSCOPE :
      if (Settings.MultiPlayer5Master)
      {
         IPPU.Controller = SNES_MULTIPLAYER5;
         break;
      }
   default :
      IPPU.Controller = SNES_JOYPAD;
      break;
   }
}

void S9xUpdateJoypads()
{
#if defined (__WIZ__)
   IPPU.Joypads[0] = S9xReadJoypad(0);

   if (IPPU.Joypads[0] & SNES_LEFT_MASK)
      IPPU.Joypads[0] &= ~SNES_RIGHT_MASK;
   if (IPPU.Joypads[0] & SNES_UP_MASK)
      IPPU.Joypads[0] &= ~SNES_DOWN_MASK;

   if (Memory.FillRAM [0x4200] & 1)
   {
      PPU.Joypad1ButtonReadPos = 16;

      Memory.FillRAM [0x4218] = (uint8) IPPU.Joypads[0];
      Memory.FillRAM [0x4219] = (uint8)(IPPU.Joypads[0] >> 8);
      if (Memory.FillRAM [0x4201] & 0x80)
      {
         Memory.FillRAM [0x421c] = (uint8) IPPU.Joypads[0];
         Memory.FillRAM [0x421d] = (uint8)(IPPU.Joypads[0] >> 8);
      }
   }
#else
   int i;

   for (i = 0; i < 5; i++)
   {
      IPPU.Joypads[i] = S9xReadJoypad(i);
      if (IPPU.Joypads[i] & SNES_LEFT_MASK)
         IPPU.Joypads[i] &= ~SNES_RIGHT_MASK;
      if (IPPU.Joypads[i] & SNES_UP_MASK)
         IPPU.Joypads[i] &= ~SNES_DOWN_MASK;
   }

   if (IPPU.Controller == SNES_JOYPAD
         || IPPU.Controller == SNES_MULTIPLAYER5)
   {
      for (i = 0; i < 5; i++)
      {
         if (IPPU.Joypads[i])
            IPPU.Joypads[i] |= 0xffff0000;
      }
   }

   // Read mouse position if enabled
   if (Settings.MouseMaster)
   {
      for (i = 0; i < 2; i++)
         S9xProcessMouse(i);
   }

   // Read SuperScope if enabled
   if (Settings.SuperScopeMaster)
      ProcessSuperScope();

   if (Memory.FillRAM[0x4200] & 1)
   {
      PPU.Joypad1ButtonReadPos = 16;
      if (Memory.FillRAM[0x4201] & 0x80)
      {
         PPU.Joypad2ButtonReadPos = 16;
         PPU.Joypad3ButtonReadPos = 0;
      }
      else
      {
         PPU.Joypad2ButtonReadPos = 0;
         PPU.Joypad3ButtonReadPos = 16;
      }

      Memory.FillRAM[0x4218] = (uint8) IPPU.Joypads[0];
      Memory.FillRAM[0x4219] = (uint8)(IPPU.Joypads[0] >> 8);
      Memory.FillRAM[0x421a] = (uint8) IPPU.Joypads[1];
      Memory.FillRAM[0x421b] = (uint8)(IPPU.Joypads[1] >> 8);
      if (Memory.FillRAM[0x4201] & 0x80)
      {
         Memory.FillRAM[0x421c] = (uint8) IPPU.Joypads[0];
         Memory.FillRAM[0x421d] = (uint8)(IPPU.Joypads[0] >> 8);
         Memory.FillRAM[0x421e] = (uint8) IPPU.Joypads[2];
         Memory.FillRAM[0x421f] = (uint8)(IPPU.Joypads[2] >> 8);
      }
      else
      {
         Memory.FillRAM[0x421c] = (uint8) IPPU.Joypads[3];
         Memory.FillRAM[0x421d] = (uint8)(IPPU.Joypads[3] >> 8);
         Memory.FillRAM[0x421e] = (uint8) IPPU.Joypads[4];
         Memory.FillRAM[0x421f] = (uint8)(IPPU.Joypads[4] >> 8);
      }
   }
#endif
}

void S9xSuperFXExec()
{
   if ((Memory.FillRAM[0x3000 + GSU_SFR] & FLG_G)
         && (Memory.FillRAM[0x3000 + GSU_SCMR] & 0x18) == 0x18)
   {
      if (!Settings.WinterGold || Settings.StarfoxHack)
         FxEmulate(~0);
      else FxEmulate((Memory.FillRAM[0x3000 + GSU_CLSR] & 1) ? 700 : 350);
      int GSUStatus = Memory.FillRAM[0x3000
                                     + GSU_SFR] | (Memory.FillRAM[0x3000 + GSU_SFR + 1] << 8);
      if ((GSUStatus & (FLG_G | FLG_IRQ)) == FLG_IRQ)
      {
         // Trigger a GSU IRQ.
         S9xSetIRQ(GSU_IRQ_SOURCE);
      }
   }
}