summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/megadriv.c
blob: 687b8408464e66cca06af1ff4bd08656e0849cc7 (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
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
/*

    Megadrive / Genesis support (formerly in mess/drivers)

    Current Issues

    Timing is wrong
     -- DMA timing not emulated
     -- Sprite render timing incorrect
     -- Interrupt Timing Problems

    Known Problems
     -- g_lem / Lemmings (JU) (REV01) [!]
      Rasters are off
     -- g_drac / Bram Stoker's Dracula (U) [!]
      Doesn't work, Timing Sensisitve
     -- g_sscc / Sesame Street Counting Cafe (U) [!]
      Doesn't work
     -- g_fatr / Fatal Rewind (UE) [!] (and clones)
      Doesn't work. Timing Sensitive

     -- various
      Rasters off by 1 line, bottom line corrupt? bad frame timing?

      + more

    ToDo:

    Fix bugs - comprehensive testing!

    Add SegaCD

    Fix 32X support (not used by any arcade systems?)
     - this seems to require far greater sync and timing accuracy on rom / ram access than MAME can provide
     - split NTSC / PAL drivers
     - 36greatju: missing backup ram, has issues with golfer select due of that
     - bcracers: write to undefined PWM register?
     - fifa96 / nbajamte: dies on the gameplay, waiting for a comm change that never occurs;
     - marsch1: doesn't boot, Master / Slave communicates through SCI
     - nbajamte: missing I2C hookup, startup fails due of that (same I2C type as plain MD version);
     - nflquart: black screen, missing h irq?
     - sangoku4: black screen after the Sega logo
     - soulstar: OSD and player sprite isn't drawn;
     - tempo: intro is too fast, mostly noticeable with the PWM sound that cuts off too early when it gets to the title screen;
     - tmek: gameplay is clearly too fast
     - vrdxu: has 3d geometry bugs, caused by a SH-2 DRC bug;
     - vrdxu: crashes if you attempt to enter into main menu;
     - wwfraw: writes fb data to the cart area and expects it to be read back, kludging the cart area to be writeable makes the 32x gfxs to appear, why?
     - wwfwre: no 32x gfxs
     - xmen: black screen after that you choose the level, needs bare minimum SH-2 SCI support

Known Non-Issues (confirmed on Real Genesis)
    Castlevania - Bloodlines (U) [!] - Pause text is missing on upside down level
    Blood Shot (E) (M4) [!] - corrupt texture in level 1 is correct...

Cleanup / Rewrite notes:

32x Marsch tests documentation (keep start pressed at start-up for individual tests):

MD side check:
#1 Communication Check
#2 FM Bit
#3 Irq Register
#4 Bank Control Register
#5 DREQ Control FULL bit
#6 DREQ SRC Address
#7 DREQ DST Address
#8 DREQ SIZE Address
#9 SEGA TV Register
#10 H IRQ Vector
#11 PWM Control Register
#12 PWM Frequency Register
#13 PWM Lch Pulse Width Register
#14 PWM Rch Pulse Width Register
#15 PWM MONO Pulse Width Register
32x side check:
#16 SH-2 Master Communication Check
#17 SH-2 Slave Communication Check
#18 SH-2 Master FM Bit
#19 SH-2 Slave FM Bit
#20 SH-2 Master IRQ Mask Register
#21 SH-2 Slave IRQ Mask Register
#22 SH-2 Master H Counter Register
#23 SH-2 Slave H Counter Register
#24 SH-2 Master PWM Timer Register
#25 SH-2 Slave PWM Timer Register
#26 SH-2 Master PWM Cont. Register
#27 SH-2 Slave PWM Cont. Register
#28 SH-2 Master PWM Freq. Register
#29 SH-2 Slave PWM Freq. Register
#30 SH-2 Master PWM Lch Register
#31 SH-2 Slave PWM Lch Register
#32 SH-2 Master PWM Rch Register
#33 SH-2 Slave PWM Rch Register
#34 SH-2 Master PWM Mono Register
#35 SH-2 Slave PWM Mono Register
#36 SH-2 Master ROM Read Check
#37 SH-2 Slave ROM Read Check
#38 SH-2 Serial Communication (ERROR - returns a Timeout Error)
MD & 32x check:
#39 MD&SH-2 Master Communication
#40 MD&SH-2 Slave Communication
#41 MD&SH-2 Master FM Bit R/W
#42 MD&SH-2 Slave FM Bit R/W
#43 MD&SH-2 Master DREQ CTL
#44 MD&SH-2 Slave DREQ CTL
#45 MD&SH-2 Master DREQ SRC address
#46 MD&SH-2 Slave DREQ SRC address
#47 MD&SH-2 Master DREQ DST address
#48 MD&SH-2 Slave DREQ DST address
#49 MD&SH-2 Master DREQ SIZE address
#50 MD&SH-2 Slave DREQ SIZE address
#51 SH-2 Master V IRQ
#52 SH-2 Slave V IRQ
#53 SH2 Master H IRQ (MD 0)
#54 SH2 Slave H IRQ (MD 0)
#55 SH2 Master H IRQ (MD 1)
#56 SH2 Slave H IRQ (MD 1)
#57 SH2 Master H IRQ (MD 2)
#58 SH2 Slave H IRQ (MD 2)
MD VDP check:
#59 Bitmap Mode Register
#60 Shift Register
#61 Auto Fill Length Register
#62 Auto Fill Start Address Register
#63 V Blank BIT
#64 H Blank BIT
#65 Palette Enable BIT
SH-2 VDP check:
#66 Frame Swap BIT
#67 SH-2 Master Bitmap MD
#68 SH-2 Slave Bitmap MD
#69 SH-2 Master Shift
#70 SH-2 Slave Shift
#71 SH-2 Master Fill SIZE
#72 SH-2 Slave Fill SIZE
#73 SH-2 Master Fill START
#74 SH-2 Slave Fill START
#75 SH-2 Master V Blank Bit
#76 SH-2 Slave V Blank Bit
#77 SH-2 Master H Blank Bit
#78 SH-2 Slave H Blank Bit
#79 SH-2 Master Palette Enable Bit
#80 SH-2 Slave Palette Enable Bit
#81 SH-2 Master Frame Swap Bit
#82 SH-2 Slave Frame Swap Bit
Framebuffer Check:
#83 MD Frame Buffer 0
#84 MD Frame Buffer 1
#85 SH-2 Master Frame Buffer 0
#86 SH-2 Slave Frame Buffer 0
#87 SH-2 Master Frame Buffer 1
#88 SH-2 Slave Frame Buffer 1
#89 MD Frame Buffer 0 Overwrite
#90 MD Frame Buffer 1 Overwrite
#91 MD Frame Buffer 0 Byte Write
#92 MD Frame Buffer 1 Byte Write
#93 SH-2 Master Frame Buffer 0 Overwrite
#94 SH-2 Slave Frame Buffer 0 Overwrite
#95 SH-2 Master Frame Buffer 1 Overwrite
#96 SH-2 Slave Frame Buffer 1 Overwrite
#97 SH-2 Master Frame Buffer 0 Byte Write
#98 SH-2 Slave Frame Buffer 0 Byte Write
#99 SH-2 Master Frame Buffer 1 Byte Write
#100 SH-2 Slave Frame Buffer 1 Byte Write
#101 MD Frame Buffer 0 Fill Data
#102 MD Frame Buffer 1 Fill Data
#103 MD Frame Buffer 0 Fill Length & Address
#104 MD Frame Buffer 1 Fill Length & Address
#105 SH-2 Master Frame Buffer 0 Fill Data
#106 SH-2 Slave Frame Buffer 0 Fill Data
#107 SH-2 Master Frame Buffer 1 Fill Data
#108 SH-2 Slave Frame Buffer 1 Fill Data
#109 SH-2 Master Frame Buffer 0 Fill Address
#110 SH-2 Slave Frame Buffer 0 Fill Address
#111 SH-2 Master Frame Buffer 1 Fill Address
#112 SH-2 Slave Frame Buffer 1 Fill Address
#113 MD Palette R/W (Blank Mode)
#114 MD Palette R/W (Display Mode)
#115 MD Palette R/W (Fill Mode)
#116 SH-2 Master Palette R/W (Blank Mode)
#117 SH-2 Slave Palette R/W (Blank Mode)
#118 SH-2 Master Palette R/W (Display Mode)
#119 SH-2 Slave Palette R/W (Display Mode)
#120 SH-2 Master Palette R/W (Fill Mode)
#121 SH-2 Slave Palette R/W (Fill Mode)
MD or SH-2 DMA check:
#122 SH-2 Master CPU Write DMA (68S) (ERROR)
#123 SH-2 Slave CPU Write DMA (68S) (ERROR)
#124 MD ROM to VRAM DMA (asserts after this)
-----
#127 SH-2 Master ROM to SDRAM DMA
#128 SH-2 Slave ROM to SDRAM DMA
#129 SH-2 Master ROM to Frame DMA
#130 SH-2 Slave ROM to Frame DMA
#131 SH-2 Master SDRAM to Frame DMA
#132 SH-2 Slave SDRAM to Frame DMA
#133 SH-2 Master Frame to SDRAM DMA
#134 SH-2 Slave Frame to SDRAM DMA
Sound Test (these don't explicitly fails):
#135 MD 68k Monaural Sound
#136 MD 68k L Sound
#137 MD 68k R Sound
#138 MD 68k L -> R Sound
#139 MD 68k R -> L Sound
#140 SH-2 Master Monaural Sound
#141 SH-2 Master L Sound
#142 SH-2 Master R Sound
#143 SH-2 Master L -> R Pan
#144 SH-2 Master R -> L Pan
#145 SH-2 Slave Monaural Sound
#146 SH-2 Slave L Sound
#147 SH-2 Slave R Sound
#148 SH-2 Slave L -> R Pan
#149 SH-2 Slave R -> L Pan
#150 SH-2 Master PWM Interrupt
#151 SH-2 Slave PWM Interrupt
#152 SH-2 Master PWM DMA Write (!)
#153 SH-2 Slave PWM DMA Write (!)
#154 Z80 PWM Monaural Sound (!)
#155 Z80 PWM L Sound (!)
#156 Z80 PWM R Sound (!)
GFX check (these don't explicitly fails):
#157 Direct Color Mode
#158 Packed Pixel Mode
#159 Runlength Mode
#160 Runlength Mode
#161 Runlength Mode


----------------------------
SegaCD notes
----------------------------

the use of the MAME tilemap system for the SegaCD 'Roz tilemap' isn't intended as a long-term
solution.  (In reality it's not a displayable tilemap anyway, just a source buffer which has
a tilemap-like structure, from which data is copied)

*/


#include "emu.h"
#include "includes/megadriv.h"

/*************************************
 *
 *  Input handlers
 *
 *************************************/

/* We need to always initialize 6 buttons pad */
static emu_timer *mess_io_timeout[3];
static int mess_io_stage[3];

static TIMER_CALLBACK( mess_io_timeout_timer_callback )
{
	mess_io_stage[(int)(FPTR)ptr] = -1;
}

/* J-Cart controller port */

static UINT8	jcart_io_data[2];

WRITE16_HANDLER( jcart_ctrl_w )
{
	jcart_io_data[0] = (data & 1) << 6;
	jcart_io_data[1] = (data & 1) << 6;
}

READ16_HANDLER( jcart_ctrl_r )
{
	UINT16	retdata = 0;
	UINT8		joy[2];

	if (jcart_io_data[0] & 0x40)
	{
		joy[0] = input_port_read_safe(space->machine, "JCART3_3B", 0);
		joy[1] = input_port_read_safe(space->machine, "JCART4_3B", 0);
		retdata = (jcart_io_data[0] & 0x40) | joy[0] | (joy[1] << 8);
	}
	else
	{
		joy[0] = ((input_port_read_safe(space->machine, "JCART3_3B", 0) & 0xc0) >> 2) |
		  (input_port_read_safe(space->machine, "JCART3_3B", 0) & 0x03);
		joy[1] = ((input_port_read_safe(space->machine, "JCART4_3B", 0) & 0xc0) >> 2) |
		  (input_port_read_safe(space->machine, "JCART4_3B", 0) & 0x03);
		retdata = (jcart_io_data[0] & 0x40) | joy[0] | (joy[1] << 8);
	}
	return retdata;
}

static void mess_init_6buttons_pad(running_machine *machine)
{
	int i;

	for (i = 0; i < 3; i++)
	{
		mess_io_timeout[i] = timer_alloc(machine, mess_io_timeout_timer_callback, (void*)(FPTR)i);
		mess_io_stage[i] = -1;
	}
}

/* These overwrite the MAME ones in DRIVER_INIT */
/* They're needed to give the users the choice between different controllers */
static UINT8 mess_md_io_read_data_port(running_machine *machine, int portnum)
{
	static const char *const pad6names[2][4] = {
		{ "PAD1_6B", "PAD2_6B", "UNUSED", "UNUSED" },
		{ "EXTRA1", "EXTRA2", "UNUSED", "UNUSED" }
	};
	static const char *const pad3names[4] = { "PAD1_3B", "PAD2_3B", "UNUSED", "UNUSED" };

	UINT8 retdata;
	int controller;
	UINT8 helper_6b = (megadrive_io_ctrl_regs[portnum] & 0x3f) | 0xc0; // bits 6 & 7 always come from megadrive_io_data_regs
	UINT8 helper_3b = (megadrive_io_ctrl_regs[portnum] & 0x7f) | 0x80; // bit 7 always comes from megadrive_io_data_regs

	switch (portnum)
	{
		case 0:
			controller = (input_port_read(machine, "CTRLSEL") & 0x0f);
			break;

		case 1:
			controller = (input_port_read(machine, "CTRLSEL") & 0xf0);
			break;

		default:
			controller = 0;
			break;
	}

	/* Are we using a 6 buttons Joypad? */
	if (controller)
	{
		if (megadrive_io_data_regs[portnum] & 0x40)
		{
			if (mess_io_stage[portnum] == 2)
			{
				/* here we read B, C & the additional buttons */
				retdata = (megadrive_io_data_regs[portnum] & helper_6b) |
							(((input_port_read_safe(machine, pad6names[0][portnum], 0) & 0x30) |
								(input_port_read_safe(machine, pad6names[1][portnum], 0) & 0x0f)) & ~helper_6b);
			}
			else
			{
				/* here we read B, C & the directional buttons */
				retdata = (megadrive_io_data_regs[portnum] & helper_6b) |
							((input_port_read_safe(machine, pad6names[0][portnum], 0) & 0x3f) & ~helper_6b);
			}
		}
		else
		{
			if (mess_io_stage[portnum] == 1)
			{
				/* here we read ((Start & A) >> 2) | 0x00 */
				retdata = (megadrive_io_data_regs[portnum] & helper_6b) |
							(((input_port_read_safe(machine, pad6names[0][portnum], 0) & 0xc0) >> 2) & ~helper_6b);
			}
			else if (mess_io_stage[portnum]==2)
			{
				/* here we read ((Start & A) >> 2) | 0x0f */
				retdata = (megadrive_io_data_regs[portnum] & helper_6b) |
							((((input_port_read_safe(machine, pad6names[0][portnum], 0) & 0xc0) >> 2) | 0x0f) & ~helper_6b);
			}
			else
			{
				/* here we read ((Start & A) >> 2) | Up and Down */
				retdata = (megadrive_io_data_regs[portnum] & helper_6b) |
							((((input_port_read_safe(machine, pad6names[0][portnum], 0) & 0xc0) >> 2) |
								(input_port_read_safe(machine, pad6names[0][portnum], 0) & 0x03)) & ~helper_6b);
			}
		}

	//  mame_printf_debug("read io data port stage %d port %d %02x\n",mess_io_stage[portnum],portnum,retdata);

		retdata |= (retdata << 8);
	}
	/* Otherwise it's a 3 buttons Joypad */
	else
	{
		if (megadrive_io_data_regs[portnum] & 0x40)
		{
			/* here we read B, C & the directional buttons */
			retdata = (megadrive_io_data_regs[portnum] & helper_3b) |
						(((input_port_read_safe(machine, pad3names[portnum], 0) & 0x3f) | 0x40) & ~helper_3b);
		}
		else
		{
			/* here we read ((Start & A) >> 2) | Up and Down */
			retdata = (megadrive_io_data_regs[portnum] & helper_3b) |
						((((input_port_read_safe(machine, pad3names[portnum], 0) & 0xc0) >> 2) |
							(input_port_read_safe(machine, pad3names[portnum], 0) & 0x03) | 0x40) & ~helper_3b);
		}
	}

	return retdata;
}


static void mess_md_io_write_data_port(running_machine *machine, int portnum, UINT16 data)
{
	int controller;

	switch (portnum)
	{
		case 0:
			controller = (input_port_read(machine, "CTRLSEL") & 0x0f);
			break;

		case 1:
			controller = (input_port_read(machine, "CTRLSEL") & 0xf0);
			break;

		default:
			controller = 0;
			break;
	}

	if (controller)
	{
		if (megadrive_io_ctrl_regs[portnum] & 0x40)
		{
			if (((megadrive_io_data_regs[portnum] & 0x40) == 0x00) && ((data & 0x40) == 0x40))
			{
				mess_io_stage[portnum]++;
				timer_adjust_oneshot(mess_io_timeout[portnum], machine->device<cpu_device>("maincpu")->cycles_to_attotime(8192), 0);
			}

		}
	}
	megadrive_io_data_regs[portnum] = data;
	//mame_printf_debug("Writing IO Data Register #%d data %04x\n",portnum,data);
}


/*************************************
 *
 *  Input ports
 *
 *************************************/


static INPUT_PORTS_START( md )
	PORT_START("CTRLSEL")	/* Controller selection */
	PORT_CATEGORY_CLASS( 0x0f, 0x00, "Player 1 Controller" )
	PORT_CATEGORY_ITEM( 0x00, "Joystick 3 Buttons", 10 )
	PORT_CATEGORY_ITEM( 0x01, "Joystick 6 Buttons", 11 )
//  PORT_CATEGORY_ITEM( 0x02, "Sega Mouse", 12 )
/* there exists both a 2 buttons version of the Mouse (Jpn ver, to be used with RPGs, it
    can aslo be used as trackball) and a 3 buttons version (US ver, no trackball feats.) */
//  PORT_CATEGORY_ITEM( 0x03, "Sega Menacer", 13 )
//  PORT_CATEGORY_ITEM( 0x04, "Konami Justifier", 14 )
//  PORT_CATEGORY_ITEM( 0x05, "Team Player (Sega Multitap)", 15 )
//  PORT_CATEGORY_ITEM( 0x06, "4-Play (EA Multitap)", 16 )
//  PORT_CATEGORY_ITEM( 0x07, "J-Cart", 17 )
	PORT_CATEGORY_CLASS( 0xf0, 0x00, "Player 2 Controller" )
	PORT_CATEGORY_ITEM( 0x00, "Joystick 3 Buttons", 20 )
	PORT_CATEGORY_ITEM( 0x10, "Joystick 6 Buttons", 21 )
	PORT_CATEGORY_CLASS( 0xf00, 0x00, "Player 3 Controller (J-Cart)" )
	PORT_CATEGORY_ITEM( 0x00, "Joystick 3 Buttons", 30 )
	PORT_CATEGORY_CLASS( 0xf000, 0x00, "Player 4 Controller (J-Cart)" )
	PORT_CATEGORY_ITEM( 0x00, "Joystick 3 Buttons", 40 )

	PORT_START("PAD1_3B")		/* Joypad 1 (3 button + start) NOT READ DIRECTLY */
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1) PORT_CATEGORY(10)
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1) PORT_CATEGORY(10)
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1) PORT_CATEGORY(10)
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1) PORT_CATEGORY(10)
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1) PORT_NAME("P1 B") PORT_CATEGORY(10)
	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(1) PORT_NAME("P1 C") PORT_CATEGORY(10)
	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_NAME("P1 A") PORT_CATEGORY(10)
	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_START ) PORT_PLAYER(1) PORT_CATEGORY(10)

	PORT_START("PAD2_3B")		/* Joypad 2 (3 button + start) NOT READ DIRECTLY */
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2) PORT_CATEGORY(20)
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2) PORT_CATEGORY(20)
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2) PORT_CATEGORY(20)
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2) PORT_CATEGORY(20)
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2) PORT_NAME("P2 B") PORT_CATEGORY(20)
	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(2) PORT_NAME("P2 C") PORT_CATEGORY(20)
	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2) PORT_NAME("P2 A") PORT_CATEGORY(20)
	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_START ) PORT_PLAYER(2) PORT_CATEGORY(20)

	PORT_START("JCART3_3B")		/* Joypad 3 on J-Cart (3 button + start) */
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(3) PORT_CATEGORY(30)
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(3) PORT_CATEGORY(30)
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(3) PORT_CATEGORY(30)
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(3) PORT_CATEGORY(30)
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(3) PORT_NAME("P3 B") PORT_CATEGORY(30)
	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(3) PORT_NAME("P3 C") PORT_CATEGORY(30)
	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(3) PORT_NAME("P3 A") PORT_CATEGORY(30)
	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_START ) PORT_PLAYER(3) PORT_CATEGORY(30)

	PORT_START("JCART4_3B")		/* Joypad 4 on J-Cart (3 button + start) */
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(4) PORT_CATEGORY(40)
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(4) PORT_CATEGORY(40)
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(4) PORT_CATEGORY(40)
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(4) PORT_CATEGORY(40)
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(4) PORT_NAME("P4 B") PORT_CATEGORY(40)
	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(4) PORT_NAME("P4 C") PORT_CATEGORY(40)
	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(4) PORT_NAME("P4 A") PORT_CATEGORY(40)
	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_START ) PORT_PLAYER(4) PORT_CATEGORY(40)

	PORT_START("PAD1_6B")		/* Joypad 1 (6 button + start + mode) NOT READ DIRECTLY */
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1) PORT_CATEGORY(11)
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1) PORT_CATEGORY(11)
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1) PORT_CATEGORY(11)
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1) PORT_CATEGORY(11)
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1) PORT_NAME("P1 B") PORT_CATEGORY(11)
	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(1) PORT_NAME("P1 C") PORT_CATEGORY(11)
	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_NAME("P1 A") PORT_CATEGORY(11)
	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_START ) PORT_PLAYER(1) PORT_CATEGORY(11)

	PORT_START("EXTRA1")	/* Extra buttons for Joypad 1 (6 button + start + mode) NOT READ DIRECTLY */
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_BUTTON6 ) PORT_PLAYER(1) PORT_NAME("P1 Z") PORT_CATEGORY(11)
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_BUTTON5 ) PORT_PLAYER(1) PORT_NAME("P1 Y") PORT_CATEGORY(11)
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_BUTTON4 ) PORT_PLAYER(1) PORT_NAME("P1 X") PORT_CATEGORY(11)
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_BUTTON7 ) PORT_PLAYER(1) PORT_NAME("P1 Mode") PORT_CATEGORY(11)

	PORT_START("PAD2_6B")		/* Joypad 2 (6 button + start + mode) NOT READ DIRECTLY */
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(2) PORT_CATEGORY(21)
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(2) PORT_CATEGORY(21)
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(2) PORT_CATEGORY(21)
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(2) PORT_CATEGORY(21)
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(2) PORT_NAME("P2 B") PORT_CATEGORY(21)
	PORT_BIT( 0x0020, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(2) PORT_NAME("P2 C") PORT_CATEGORY(21)
	PORT_BIT( 0x0040, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2) PORT_NAME("P2 A") PORT_CATEGORY(21)
	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_START ) PORT_PLAYER(2) PORT_CATEGORY(21)

	PORT_START("EXTRA2")	/* Extra buttons for Joypad 2 (6 button + start + mode) NOT READ DIRECTLY */
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_BUTTON6 ) PORT_PLAYER(2) PORT_NAME("P2 Z") PORT_CATEGORY(21)
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_BUTTON5 ) PORT_PLAYER(2) PORT_NAME("P2 Y") PORT_CATEGORY(21)
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_BUTTON4 ) PORT_PLAYER(2) PORT_NAME("P2 X") PORT_CATEGORY(21)
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_BUTTON7 ) PORT_PLAYER(2) PORT_NAME("P2 Mode") PORT_CATEGORY(21)

	PORT_START("RESET")		/* Buttons on Genesis Console */
	PORT_BIT( 0x0001, IP_ACTIVE_HIGH, IPT_SERVICE1 ) PORT_NAME("Reset Button") PORT_IMPULSE(1) // reset, resets 68k (and..?)
INPUT_PORTS_END


/* MegaDrive inputs + Fake Region Selection */
/* We need this as long as we only have the US version of the SVP add-on, otherwise we could not play
   Non-US Virtua Racing versions. It is also handy to develop add-ons emulation without adding each
   region variants, while they do not even work. Once emulation is working this must disappear.  */
static INPUT_PORTS_START( md_sel )
	PORT_INCLUDE( md )

	PORT_START("REGION")
	/* Region setting for Console */
	PORT_CONFNAME( 0x000f, 0x0000, DEF_STR( Region ) )
	PORT_CONFSETTING(      0x0000, "Use Default Choice" )
	PORT_CONFSETTING(      0x0001, "US (NTSC, 60fps)" )
	PORT_CONFSETTING(      0x0002, "Japan (NTSC, 60fps)" )
	PORT_CONFSETTING(      0x0003, "Europe (PAL, 50fps)" )
INPUT_PORTS_END


/*************************************
 *
 *  Machine driver
 *
 *************************************/

static MACHINE_START( ms_megadriv )
{
	mess_init_6buttons_pad(machine);
	MACHINE_START_CALL( md_sram );
}

static MACHINE_RESET( ms_megadriv )
{
	MACHINE_RESET_CALL( megadriv );
}

static MACHINE_CONFIG_DERIVED( ms_megadriv, megadriv )

	MCFG_MACHINE_START( ms_megadriv )
	MCFG_MACHINE_RESET( ms_megadriv )

	MCFG_FRAGMENT_ADD( genesis_cartslot )
MACHINE_CONFIG_END

static MACHINE_CONFIG_DERIVED( ms_megadpal, megadpal )

	MCFG_MACHINE_START( ms_megadriv )
	MCFG_MACHINE_RESET( ms_megadriv )

	MCFG_FRAGMENT_ADD( genesis_cartslot )
MACHINE_CONFIG_END

static MACHINE_CONFIG_DERIVED( ms_megdsvp, megdsvp )

	MCFG_MACHINE_START( ms_megadriv )
	MCFG_MACHINE_RESET( ms_megadriv )

	MCFG_FRAGMENT_ADD( genesis_cartslot )
MACHINE_CONFIG_END



/*************************************
 *
 *  ROM definition(s)
 *
 *************************************/


/* we don't use the bios rom (it's not needed and only provides security on early models) */

ROM_START(genesis)
	ROM_REGION(0x1415000, "maincpu", ROMREGION_ERASEFF)
	ROM_REGION( 0x10000, "soundcpu", ROMREGION_ERASEFF)
ROM_END

ROM_START(gensvp)
	ROM_REGION(0x1415000, "maincpu", ROMREGION_ERASEFF)
	ROM_REGION( 0x10000, "soundcpu", ROMREGION_ERASEFF)
ROM_END

ROM_START(megadriv)
	ROM_REGION(0x1415000, "maincpu", ROMREGION_ERASEFF)
	ROM_REGION( 0x10000, "soundcpu", ROMREGION_ERASEFF)
ROM_END

ROM_START(megadrij)
	ROM_REGION(0x1415000, "maincpu", ROMREGION_ERASEFF)
	ROM_REGION( 0x10000, "soundcpu", ROMREGION_ERASEFF)
ROM_END


/*************************************
 *
 *  Driver initialization
 *
 *************************************/

static DRIVER_INIT( mess_md_common )
{
	megadrive_io_read_data_port_ptr = mess_md_io_read_data_port;
	megadrive_io_write_data_port_ptr = mess_md_io_write_data_port;
}

static DRIVER_INIT( genesis )
{
	DRIVER_INIT_CALL(megadriv);
	DRIVER_INIT_CALL(mess_md_common);
}

static DRIVER_INIT( gensvp )
{
	DRIVER_INIT_CALL(megadriv);
	DRIVER_INIT_CALL(mess_md_common);
}

static DRIVER_INIT( md_eur )
{
	DRIVER_INIT_CALL(megadrie);
	DRIVER_INIT_CALL(mess_md_common);
}

static DRIVER_INIT( md_jpn )
{
	DRIVER_INIT_CALL(megadrij);
	DRIVER_INIT_CALL(mess_md_common);
}

/****************************************** SegaCD & 32X emulation ****************************************/

/* Very preliminary skeleton code from David Haywood, borrowed for MESS by Fabio Priuli */
/* These are only included to document BIOS informations currently available */

static DRIVER_INIT( mess_32x )
{
	DRIVER_INIT_CALL(_32x);
	DRIVER_INIT_CALL(mess_md_common);
}

static MACHINE_CONFIG_DERIVED( ms_32x, genesis_32x )

	MCFG_FRAGMENT_ADD( _32x_cartslot )
MACHINE_CONFIG_END


ROM_START( 32x )
	ROM_REGION16_BE( 0x400000, "gamecart", ROMREGION_ERASE00 ) /* 68000 Code */
//  ROM_CART_LOAD("cart", 0x000000, 0x400000, ROM_NOMIRROR)

	ROM_REGION32_BE( 0x400000, "gamecart_sh2", ROMREGION_ERASE00 ) /* Copy for the SH2 */
//  ROM_CART_LOAD("cart", 0x000000, 0x400000, ROM_NOMIRROR)

	ROM_REGION16_BE( 0x400000, "32x_68k_bios", 0 ) /* 68000 Code */
	ROM_LOAD( "32x_g_bios.bin", 0x000000,  0x000100, CRC(5c12eae8) SHA1(dbebd76a448447cb6e524ac3cb0fd19fc065d944) )

	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	// temp, rom should only be visible here when one of the regs is set, tempo needs it
//  ROM_CART_LOAD("cart", 0x000000, 0x400000, ROM_NOMIRROR)
	ROM_COPY( "32x_68k_bios", 0x0, 0x0, 0x100)

	ROM_REGION( 0x400000, "32x_master_sh2", 0 ) /* SH2 Code */
	ROM_SYSTEM_BIOS( 0, "retail", "Mars Version 1.0 (retail)" )
	ROMX_LOAD( "32x_m_bios.bin", 0x000000,  0x000800, CRC(dd9c46b8) SHA1(1e5b0b2441a4979b6966d942b20cc76c413b8c5e), ROM_BIOS(1) )
	ROM_SYSTEM_BIOS( 1, "sdk", "Mars Version 1.0 (early sdk)" )
	ROMX_LOAD( "32x_m_bios_sdk.bin", 0x000000,  0x000800, BAD_DUMP CRC(c7102c53) SHA1(ed73a47f186b373b8eff765f84ef26c3d9ef6cb0), ROM_BIOS(2) )

	ROM_REGION( 0x400000, "32x_slave_sh2", 0 ) /* SH2 Code */
	ROM_LOAD( "32x_s_bios.bin", 0x000000,  0x000400, CRC(bfda1fe5) SHA1(4103668c1bbd66c5e24558e73d4f3f92061a109a) )
ROM_END

/* We need proper names for most of these BIOS ROMs! */
ROM_START( segacd )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	/* v1.10 */
	ROM_LOAD( "segacd_model1_bios_1_10_u.bin", 0x000000,  0x020000, CRC(c6d10268) SHA1(f4f315adcef9b8feb0364c21ab7f0eaf5457f3ed) )
ROM_END

ROM_START( megacd )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	/* v1.00, confirmed good dump */
	ROM_LOAD( "megacd_model1_bios_1_00_e.bin", 0x000000,  0x020000, CRC(529ac15a) SHA1(f891e0ea651e2232af0c5c4cb46a0cae2ee8f356) )
ROM_END

ROM_START( megacdj )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	ROM_SYSTEM_BIOS(0, "v100s", "v1.00S") /* also used for Asia PAL - not handled yet */
	ROMX_LOAD( "megacd_model1_bios_1_00s_j.bin", 0x000000,  0x020000, CRC(550f30bb) SHA1(e4193c6ae44c3cea002707d2a88f1fbcced664de), ROM_BIOS(1) )
	ROM_SYSTEM_BIOS(1, "v100p", "v1.00P")
	ROMX_LOAD( "megacd_model1_bios_1_00p_j.bin", 0x000000,  0x020000, CRC(9d2da8f2) SHA1(4846f448160059a7da0215a5df12ca160f26dd69), ROM_BIOS(2) )
ROM_END

ROM_START( segacd2 )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	ROM_SYSTEM_BIOS(0, "v211x", "Model 2 v2.11X")
	ROMX_LOAD( "mpr-15764-t.bin", 0x000000,  0x020000, CRC(2e49d72c) SHA1(328a3228c29fba244b9db2055adc1ec4f7a87e6b), ROM_BIOS(1) )
	ROM_SYSTEM_BIOS(1, "v200", "Model 2 v2.00") /* verified dump */
	ROMX_LOAD( "us_scd2_930314.bin", 0x000000,  0x020000, CRC(8af65f58) SHA1(5a8c4b91d3034c1448aac4b5dc9a6484fce51636), ROM_BIOS(2) )
	/* this is reportedly a bad dump, it has many differences from the verified dump and does not boot in Kega */
	/* ROMX_LOAD( "segacd_model2_bios_2_00_u.bin", 0x000000,  0x020000, CRC(340b4be4) SHA1(bd3ee0c8ab732468748bf98953603ce772612704), ROM_BIOS(2) ) */
	ROM_SYSTEM_BIOS(2, "v200w", "Model 2 v2.00W")
	ROMX_LOAD( "segacd_model2_bios_2_00w_u.bin", 0x000000,  0x020000, CRC(9f6f6276) SHA1(5adb6c3af218c60868e6b723ec47e36bbdf5e6f0), ROM_BIOS(3) )
ROM_END

ROM_START( megacd2 )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	ROM_SYSTEM_BIOS(0, "v200w", "v2.00W")	// confirmed good dump
	ROMX_LOAD( "mpr-15512a.bin", 0x000000,  0x020000, CRC(2a4b82b5) SHA1(45134ef8655b9d06b130726786efe2f8b1d430a3), ROM_BIOS(1) )
	ROM_SYSTEM_BIOS(1, "v200", "v2.00")
	ROMX_LOAD( "mpr-15512-t.bin", 0x000000,  0x020000, CRC(62108fff) SHA1(cfcf092e0a70779fc5912da0fbd154838df997da), ROM_BIOS(2) )
ROM_END

ROM_START( megacd2j )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	ROM_SYSTEM_BIOS(0, "v200c", "v2.00C")
	ROMX_LOAD( "mpr-15398.bin", 0x000000,  0x020000, CRC(ba7bf31d) SHA1(762d20ebb85b980c17c53f928c002d747920a281), ROM_BIOS(1) )
ROM_END

ROM_START( laseract )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	ROM_SYSTEM_BIOS(0, "v104", "v1.04")
	ROMX_LOAD( "laseractive_bios_1_04_u.bin", 0x000000,  0x020000, CRC(50cd3d23) SHA1(aa811861f8874775075bd3f53008c8aaf59b07db), ROM_BIOS(1) )
	ROM_SYSTEM_BIOS(1, "v102", "v1.02")
	ROMX_LOAD( "laseractive_bios_1_02_u.bin", 0x000000,  0x020000, CRC(3b10cf41) SHA1(8af162223bb12fc19b414f126022910372790103), ROM_BIOS(2) )
ROM_END

ROM_START( laseractj )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	/* v1.02 */
	ROM_LOAD( "laseractive_bios_1_02_j.bin", 0x000000,  0x020000, CRC(00eedb3a) SHA1(26237b333db4a4c6770297fa5e655ea95840d5d9) )
ROM_END

ROM_START( xeye )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	/* v2.00 (US), confirmed good with a chip dump */
	ROM_LOAD( "g304.bin", 0x000000,  0x020000, CRC(290f8e33) SHA1(651f14d5a5e0ecb974a60c0f43b1d2006323fb09) )
ROM_END

ROM_START( wmega )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	/* v1.00 (Japan NTSC) Sega BIOS, chip-dumped */
	ROM_LOAD( "g301.bin", 0x000000,  0x020000, CRC(d21fe71d) SHA1(3fc9358072f74bd24e3e297ea11b2bf15a7af891) )
ROM_END

ROM_START( wmegam2 )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	/* v2.00 */
	ROM_LOAD( "wondermega_m2_bios_2_00_j.bin", 0x000000,  0x020000, CRC(2b19972f) SHA1(b3f32e409bd5508c89ed8be33d41a58d791d0e5d) )
ROM_END

ROM_START( cdx )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	/* v2.21X */
	ROM_LOAD( "segacdx_bios_2_21_u.bin", 0x000000,  0x020000, CRC(d48c44b5) SHA1(2b125c0545afa089b617f2558e686ea723bdc06e) )
ROM_END

ROM_START( multmega )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )
	/* v2.21X */
	ROM_LOAD( "opr-16140.bin", 0x000000,  0x020000, CRC(aacb851e) SHA1(75548ac9aaa6e81224499f9a1403b2b42433f5b7) )
	/* the below was marked "confirmed good dump", but 0x72 and 0x73 are 0xFF, indicating a bad dump made from memory */
	/* ROM_LOAD( "multimega_bios_2_21_e.bin", 0x000000,  0x020000, CRC(34d3cce1) SHA1(73fc9c014ad803e9e7d8076b3642a8a5224b3e51) ) */
ROM_END

/* some games use the 32x and SegaCD together to give better quality FMV */
ROM_START( 32x_scd )
	ROM_REGION16_BE( 0x400000, "maincpu", ROMREGION_ERASE00 )

	ROM_REGION16_BE( 0x400000, "gamecart", 0 ) /* 68000 Code */
	ROM_LOAD( "mpr-15764-t.bin", 0x000000,  0x020000, CRC(2e49d72c) SHA1(328a3228c29fba244b9db2055adc1ec4f7a87e6b) )

	ROM_REGION32_BE( 0x400000, "gamecart_sh2", 0 ) /* Copy for the SH2 */
	ROM_COPY( "gamecart", 0x0, 0x0, 0x400000)

	ROM_REGION16_BE( 0x400000, "32x_68k_bios", 0 ) /* 68000 Code */
	ROM_LOAD( "32x_g_bios.bin", 0x000000,  0x000100, CRC(5c12eae8) SHA1(dbebd76a448447cb6e524ac3cb0fd19fc065d944) )

	ROM_REGION( 0x400000, "32x_master_sh2", 0 ) /* SH2 Code */
	ROM_LOAD( "32x_m_bios.bin", 0x000000,  0x000800, CRC(dd9c46b8) SHA1(1e5b0b2441a4979b6966d942b20cc76c413b8c5e) )

	ROM_REGION( 0x400000, "32x_slave_sh2", 0 ) /* SH2 Code */
	ROM_LOAD( "32x_s_bios.bin", 0x000000,  0x000400, CRC(bfda1fe5) SHA1(4103668c1bbd66c5e24558e73d4f3f92061a109a) )
ROM_END


/****************************************** PICO emulation ****************************************/

/*
   Pico Implementation By ElBarto (Emmanuel Vadot, elbarto@megadrive.org)
   Still missing the PCM custom chip
   Some game will not boot due to this

 Pico Info from Notaz (http://notaz.gp2x.de/docs/picodoc.txt)

 addr   acc   description
-------+-----+------------
800001  byte  Version register.
              ?vv? ????, where v can be:
                00 - hardware is for Japan
                01 - European version
                10 - USA version
                11 - ?
800003  byte  Buttons, 0 for pressed, 1 for released:
                bit 0: UP (white)
                bit 1: DOWN (orange)
                bit 2: LEFT (blue)
                bit 3: RIGHT (green)
                bit 4: red button
                bit 5: unused?
                bit 6: unused?
                bit 7: pen button
800005  byte  Most significant byte of pen x coordinate.
800007  byte  Least significant byte of pen x coordinate.
800009  byte  Most significant byte of pen y coordinate.
80000b  byte  Least significant byte of pen y coordinate.
80000d  byte  Page register. One bit means one uncovered page sensor.
                00 - storyware closed
                01, 03, 07, 0f, 1f, 3f - pages 1-6
                either page 5 or page 6 is often unused.
800010  word  PCM data register.
        r/w   read returns free bytes left in PCM FIFO buffer
              writes write data to buffer.
800012  word  PCM control register.
        r/w   For writes, it has following possible meanings:
              ?p?? ???? ???? ?rrr
                p - set to enable playback?
                r - sample rate / PCM data type?
                  0: 8kHz 4bit ADPCM?
                  1-7: 16kHz variants?
              For reads, if bit 15 is cleared, it means PCM is 'busy' or
              something like that, as games sometimes wait for it to become 1.
800019  byte  Games write 'S'
80001b  byte  Games write 'E'
80001d  byte  Games write 'G'
80001f  byte  Games write 'A'

*/

#define PICO_PENX	1
#define PICO_PENY	2

static UINT16 pico_read_penpos(running_machine *machine, int pen)
{
  UINT16 penpos = 0;

  switch (pen)
    {
    case PICO_PENX:
      penpos = input_port_read_safe(machine, "PENX", 0);
      penpos |= 0x6;
      penpos = penpos * 320 / 255;
      penpos += 0x3d;
      break;
    case PICO_PENY:
      penpos = input_port_read_safe(machine, "PENY", 0);
      penpos |= 0x6;
      penpos = penpos * 251 / 255;
      penpos += 0x1fc;
      break;
    }
  return penpos;
}

static READ16_HANDLER( pico_68k_io_read )
{
	UINT8 retdata;
	static UINT8 page_register = 0;


	retdata = 0;

	switch (offset)
	  {
	  case 0:	/* Version register ?XX?????? where XX is 00 for japan, 01 for europe and 10 for USA*/
		retdata = (megadrive_region_export << 6) | (megadrive_region_pal << 5);
	    break;
	  case 1:
	    retdata = input_port_read_safe(space->machine, "PAD", 0);
	    break;

	    /*
           Still notes from notaz for the pen :

           The pen can be used to 'draw' either on the drawing pad or on the storyware
           itself. Both storyware and drawing pad are mapped on single virtual plane, where
           coordinates range:

           x: 0x03c - 0x17c
           y: 0x1fc - 0x2f7 (drawing pad)
              0x2f8 - 0x3f3 (storyware)
         */
	  case 2:
	    retdata = pico_read_penpos(space->machine, PICO_PENX) >> 8;
	    break;
	  case 3:
	    retdata = pico_read_penpos(space->machine, PICO_PENX) & 0x00ff;
	    break;
	  case 4:
	    retdata = pico_read_penpos(space->machine, PICO_PENY) >> 8;
	    break;
	  case 5:
	    retdata = pico_read_penpos(space->machine, PICO_PENY) & 0x00ff;
	    break;
	  case 6:
	    /* Page register :
           00 - storyware closed
           01, 03, 07, 0f, 1f, 3f - pages 1-6
           either page 5 or page 6 is often unused.
        */
	    {
	      UINT8 tmp;

	      tmp = input_port_read_safe(space->machine, "PAGE", 0);
	      if (tmp == 2 && page_register != 0x3f)
		{
		  page_register <<= 1;
		  page_register |= 1;
		}
	      if (tmp == 1 && page_register != 0x00)
		page_register >>= 1;
	      retdata = page_register;
	      break;
	    }
	  case 7:
	    /* Returns free bytes left in the PCM FIFO buffer */
	    retdata = 0x00;
	    break;
	  case 8:
	    /*
           For reads, if bit 15 is cleared, it means PCM is 'busy' or
           something like that, as games sometimes wait for it to become 1.
        */
	    retdata = 0x00;
	  }
	return retdata | retdata <<8;
}

static WRITE16_HANDLER( pico_68k_io_write )
{
	switch (offset)
	  {
	  }
}

static ADDRESS_MAP_START( _pico_mem, ADDRESS_SPACE_PROGRAM, 16 )
	AM_RANGE(0x000000, 0x3fffff) AM_ROM

	AM_RANGE(0x800000, 0x80001f) AM_READWRITE(pico_68k_io_read, pico_68k_io_write)

	AM_RANGE(0xc00000, 0xc0001f) AM_READWRITE(megadriv_vdp_r, megadriv_vdp_w)
	AM_RANGE(0xe00000, 0xe0ffff) AM_RAM AM_MIRROR(0x1f0000) AM_BASE(&megadrive_ram)
ADDRESS_MAP_END


static INPUT_PORTS_START( pico )
	PORT_START("PAD")
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT( 0x0004, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT( 0x0008, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_PLAYER(1)
	PORT_BIT( 0x0010, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1) PORT_NAME("Red Button")
	PORT_BIT( 0x0080, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_PLAYER(1) PORT_NAME("Pen Button")

	PORT_START("PAGE")
	PORT_BIT( 0x0001, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_PLAYER(1) PORT_NAME("Increment Page")
	PORT_BIT( 0x0002, IP_ACTIVE_LOW, IPT_BUTTON4 ) PORT_PLAYER(1) PORT_NAME("Decrement Page")

	PORT_START("PENX")
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_X ) PORT_CROSSHAIR(X, 1.0, 0.0, 0) PORT_SENSITIVITY(30) PORT_KEYDELTA(10) PORT_MINMAX(0, 255) PORT_CATEGORY(5) PORT_PLAYER(1) PORT_NAME("PEN X")

	PORT_START("PENY")
	PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y ) PORT_CROSSHAIR(Y, 1.0, 0.0, 0) PORT_SENSITIVITY(30) PORT_KEYDELTA(10) PORT_MINMAX(0,255 ) PORT_CATEGORY(5) PORT_PLAYER(1) PORT_NAME("PEN Y")

	PORT_START("REGION")
	/* Region setting for Console */
	PORT_DIPNAME( 0x000f, 0x0000, DEF_STR( Region ) )
	PORT_DIPSETTING(      0x0000, "Use HazeMD Default Choice" )
	PORT_DIPSETTING(      0x0001, "US (NTSC, 60fps)" )
	PORT_DIPSETTING(      0x0002, "JAPAN (NTSC, 60fps)" )
	PORT_DIPSETTING(      0x0003, "EUROPE (PAL, 50fps)" )
INPUT_PORTS_END


static MACHINE_CONFIG_DERIVED( pico, megadriv )

	MCFG_CPU_MODIFY("maincpu")
	MCFG_CPU_PROGRAM_MAP(_pico_mem)

	MCFG_DEVICE_REMOVE("genesis_snd_z80")

	MCFG_MACHINE_RESET( ms_megadriv )

	MCFG_FRAGMENT_ADD( pico_cartslot )
MACHINE_CONFIG_END

static MACHINE_CONFIG_DERIVED( picopal, megadpal )

	MCFG_CPU_MODIFY("maincpu")
	MCFG_CPU_PROGRAM_MAP(_pico_mem)

	MCFG_DEVICE_REMOVE("genesis_snd_z80")

	MCFG_MACHINE_RESET( ms_megadriv )

	MCFG_FRAGMENT_ADD( pico_cartslot )
MACHINE_CONFIG_END



ROM_START( pico )
	ROM_REGION(0x1415000, "maincpu", ROMREGION_ERASEFF)
	ROM_REGION( 0x10000, "soundcpu", ROMREGION_ERASEFF)
ROM_END

ROM_START( picou )
	ROM_REGION(0x1415000, "maincpu", ROMREGION_ERASEFF)
	ROM_REGION( 0x10000, "soundcpu", ROMREGION_ERASEFF)
ROM_END

ROM_START( picoj )
	ROM_REGION(0x1415000, "maincpu", ROMREGION_ERASEFF)
	ROM_REGION( 0x10000, "soundcpu", ROMREGION_ERASEFF)
ROM_END

/***************************************************************************

  Game driver(s)

***************************************************************************/

/*    YEAR  NAME        PARENT     COMPAT  MACHINE          INPUT   INIT       COMPANY   FULLNAME */
CONS( 1989, genesis,    0,         0,      ms_megadriv,     md,     genesis,   "Sega",   "Genesis (USA, NTSC)", 0)
CONS( 1993, gensvp,     genesis,   0,      ms_megdsvp,      md_sel, gensvp,    "Sega",   "Genesis (USA, NTSC, w/SVP)", 0)
CONS( 1990, megadriv,   genesis,   0,      ms_megadpal,     md,     md_eur,    "Sega",   "Mega Drive (Europe, PAL)", 0)
CONS( 1988, megadrij,   genesis,   0,      ms_megadriv,     md,     md_jpn,    "Sega",   "Mega Drive (Japan, NTSC)", 0)
CONS( 1994, pico,       0,         0,      picopal,         pico,   md_eur,    "Sega",   "Pico (Europe, PAL)", 0)
CONS( 1994, picou,      pico,      0,      pico,            pico,   genesis,   "Sega",   "Pico (USA, NTSC)", 0)
CONS( 1993, picoj,      pico,      0,      pico,            pico,   md_jpn,    "Sega",   "Pico (Japan, NTSC)", 0)

/* Not Working */
CONS( 1994, 32x,        0,         0,      ms_32x,          md_sel, mess_32x,  "Sega",   "32X", GAME_NOT_WORKING )
CONS( 1992, segacd,     0,         0,      genesis_scd,     md,     genesis,   "Sega",   "Sega CD (USA, NTSC)", GAME_NOT_WORKING )
CONS( 1993, megacd,     segacd,    0,      genesis_scd,     md,     md_eur,    "Sega",   "Mega-CD (Europe, PAL)", GAME_NOT_WORKING )
CONS( 1991, megacdj,    segacd,    0,      genesis_scd,     md,     md_jpn,    "Sega",   "Mega-CD (Japan, NTSC)", GAME_NOT_WORKING )
CONS( 1993, segacd2,    0,         0,      genesis_scd,     md,     genesis,   "Sega",   "Sega CD 2 (USA, NTSC)", GAME_NOT_WORKING )
CONS( 1993, megacd2,    segacd2,   0,      genesis_scd,     md,     md_eur,    "Sega",   "Mega-CD 2 (Europe, PAL)", GAME_NOT_WORKING )
CONS( 1993, megacd2j,   segacd2,   0,      genesis_scd,     md,     md_jpn,    "Sega",   "Mega-CD 2 (Japan, NTSC)", GAME_NOT_WORKING )
CONS( 1993, laseract,   0,         0,      genesis_scd,     md,     genesis,   "Pioneer","LaserActive (USA, NTSC)", GAME_NOT_WORKING )
CONS( 1993, laseractj,  laseract,  0,      genesis_scd,     md,     md_jpn,    "Pioneer","LaserActive (Japan, NTSC)", GAME_NOT_WORKING )
CONS( 1993, xeye,       0,         0,      genesis_scd,     md,     genesis,   "JVC",    "X'eye (USA, NTSC)", GAME_NOT_WORKING )
CONS( 1992, wmega,      xeye,      0,      genesis_scd,     md,     md_jpn,    "Sega",   "Wondermega (Japan, NTSC)", GAME_NOT_WORKING )
CONS( 1993, wmegam2,    xeye,      0,      genesis_scd,     md,     md_jpn,    "Victor", "Wondermega M2 (Japan, NTSC)", GAME_NOT_WORKING )
CONS( 1994, cdx,        0,         0,      genesis_scd,     md,     genesis,   "Sega",   "CDX (USA, NTSC)", GAME_NOT_WORKING )
CONS( 1994, multmega,   cdx,       0,      genesis_scd,     md,     md_eur,    "Sega",   "Multi-Mega (Europe, PAL)", GAME_NOT_WORKING )
CONS( 1994, 32x_scd,    segacd,    0,      genesis_32x_scd, md_sel, mess_32x,  "Sega",   "Sega CD (USA, NTSC, w/32X)", GAME_NOT_WORKING )