summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/twin16.cpp
blob: 0d3fd3b20f71f0774b9d9094afb6d5a4f4066699 (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
// license:BSD-3-Clause
// copyright-holders:Phil Stroffolino
/*

    Konami Twin16 Hardware - Video

    TODO:

    - clean up sprite system
    - bad sprites in devilw, eg. odd colours for the mud/lava monster in the 1st level,
      or wrong sprite-sprite priority sometimes -- check real arcade first
    - unsure about some sprite preprocessor attributes (see spriteram_process)

*/

#include "emu.h"
#include "includes/twin16.h"




enum
{
	TWIN16_SCREEN_FLIPY = 0x01,
	TWIN16_SCREEN_FLIPX = 0x02, // confirmed: Hard Puncher Intro
	TWIN16_PRI0         = 0x04, // PRI0 input into 007789 PAL
	TWIN16_PRI1         = 0x08, // PRI1 input into 007789 PAL
	TWIN16_PRI2_UNUSED  = 0x10, // schematic shows as PRI2 input, but unused
	TWIN16_TILE_FLIPY   = 0x20  // confirmed: Vulcan Venture
};

enum
{
	// user-defined priorities
	TWIN16_BG_OVER_SPRITES = 0x01, // BG pixel has priority over opaque sprite pixels
	TWIN16_BG_NO_SHADOW    = 0x02, // BG pixel has priority over shadow sprite pixels
	TWIN16_SPRITE_OCCUPIED = 0x04
};


WRITE16_MEMBER(twin16_state::fixram_w)
{
	COMBINE_DATA(&m_fixram[offset]);
	m_fixed_tmap->mark_tile_dirty(offset);
}

WRITE16_MEMBER(twin16_state::videoram0_w)
{
	COMBINE_DATA(&m_videoram[0][offset]);
	m_scroll_tmap[0]->mark_tile_dirty(offset);
}

WRITE16_MEMBER(twin16_state::videoram1_w)
{
	COMBINE_DATA(&m_videoram[1][offset]);
	m_scroll_tmap[1]->mark_tile_dirty(offset);
}

WRITE16_MEMBER(twin16_state::zipram_w)
{
	uint16_t old = m_zipram[offset];
	COMBINE_DATA(&m_zipram[offset]);
	if (m_zipram[offset] != old)
		m_gfxdecode->gfx(1)->mark_dirty(offset / 16);
}

void twin16_state::twin16_postload()
{
	m_gfxdecode->gfx(1)->mark_all_dirty();
}

WRITE16_MEMBER(fround_state::gfx_bank_w)
{
	int changed = 0;

	if (ACCESSING_BITS_0_7)
	{
		int oldbank0 = m_gfx_bank[0];
		int oldbank1 = m_gfx_bank[1];
		m_gfx_bank[0] = (data >> 0) & 0xf;
		m_gfx_bank[1] = (data >> 4) & 0xf;
		changed |= (oldbank0 ^ m_gfx_bank[0]) | (oldbank1 ^ m_gfx_bank[1]);
	}
	if (ACCESSING_BITS_8_15)
	{
		int oldbank2 = m_gfx_bank[2];
		int oldbank3 = m_gfx_bank[3];
		m_gfx_bank[2] = (data >> 8) & 0xf;
		m_gfx_bank[3] = (data >> 12) & 0xf;
		changed |= (oldbank2 ^ m_gfx_bank[2]) | (oldbank3 ^ m_gfx_bank[3]);
	}
	if (changed)
	{
		m_scroll_tmap[0]->mark_all_dirty();
		m_scroll_tmap[1]->mark_all_dirty();
	}
}

WRITE16_MEMBER(twin16_state::video_register_w)
{
	switch (offset)
	{
		case 0:
		{
			int old = m_video_register;
			COMBINE_DATA( &m_video_register );
			int changed = old ^ m_video_register;
			if (changed & (TWIN16_SCREEN_FLIPX | TWIN16_SCREEN_FLIPY))
			{
				int flip = (m_video_register&TWIN16_SCREEN_FLIPX) ? TILEMAP_FLIPX : 0;
				flip |= (m_video_register&TWIN16_SCREEN_FLIPY) ? TILEMAP_FLIPY : 0;
				machine().tilemap().set_flip_all(flip);
			}
			if (changed & TWIN16_TILE_FLIPY)
			{
				m_scroll_tmap[0]->mark_all_dirty();
				m_scroll_tmap[1]->mark_all_dirty();
			}
			break;
		}

		case 1: COMBINE_DATA( &m_scrollx[0] ); break;
		case 2: COMBINE_DATA( &m_scrolly[0] ); break;
		case 3:
			COMBINE_DATA( &m_scrollx[1] );
			m_scroll_tmap[0]->set_scrollx(0, m_scrollx[1]);
			break;
		case 4:
			COMBINE_DATA( &m_scrolly[1] );
			m_scroll_tmap[0]->set_scrolly(0, m_scrolly[1]);
			break;
		case 5:
			COMBINE_DATA( &m_scrollx[2] );
			m_scroll_tmap[1]->set_scrollx(0, m_scrollx[2]);
			break;
		case 6:
			COMBINE_DATA( &m_scrolly[2] );
			m_scroll_tmap[1]->set_scrolly(0, m_scrolly[2]);
			break;

		default:
			logerror("unknown video_register write:%d", data );
			break;
	}
}

/*
 * Sprite Format
 * ----------------------------------
 * preprocessor (not much data to test with):
 * Word | Bit(s)           | Use
 * -----+-fedcba9876543210-+----------------
 *   0  | x--------------- | enable
 *   0  | -xxxxxxx-------- | ?
 *   0  | --------xxxxxxxx | sprite-sprite priority
 * -----+------------------+
 *   1  | xxxxxxxxxxxxxxxx | ?
 * -----+------------------+
 *   2  | xxxxxx---------- | ?
 *   2  | ------x--------- | yflip (devilw)
 *   2  | -------x-------- | xflip
 *   2  | --------xx------ | height
 *   2  | ----------xx---- | width
 *   2  | ------------xxxx | color
 * -----+------------------+
 *   3  | -xxxxxxxxxxxxxxx | code
 * -----+------------------+
 *   4  | -------xxxxxxxxx | xpos high, other bits probably no effect
 *   5  | xxxxxxxx-------- | xpos low, other bits probably no effect
 *   6  | -------xxxxxxxxx | xpos high, other bits probably no effect
 *   7  | xxxxxxxx-------- | ypos low, other bits probably no effect
 *
 * ----------------------------------
 * normal/after preprocessing:
 * Word | Bit(s)           | Use
 * -----+-fedcba9876543210-+----------------
 *   0  | -xxxxxxxxxxxxxxx | code
 * -----+------------------+
 *   1  | -------xxxxxxxxx | ypos
 * -----+------------------+
 *   2  | -------xxxxxxxxx | xpos
 * -----+------------------+
 *   3  | x--------------- | enable
 *   3  | -xxxxx---------- | ?
 *   3  | ------x--------- | yflip  ?
 *   3  | -------x-------- | xflip
 *   3  | --------xx------ | height
 *   3  | ----------xx---- | width
 *   3  | ------------xxxx | color
 */

READ16_MEMBER(twin16_state::sprite_status_r)
{
	// bit 0: busy, other bits: dunno
	return m_sprite_busy;
}

TIMER_CALLBACK_MEMBER(twin16_state::sprite_tick)
{
	m_sprite_busy = 0;
}

int twin16_state::set_sprite_timer(  )
{
	if (m_sprite_busy) return 1;

	// sprite system busy, maybe a dma? time is guessed, assume 4 scanlines
	m_sprite_busy = 1;
	m_sprite_timer->adjust(m_screen->frame_period() / m_screen->height() * 4);

	return 0;
}

void twin16_state::spriteram_process(  )
{
	uint16_t *spriteram16 = m_spriteram->live();
	uint16_t dx = m_scrollx[0];
	uint16_t dy = m_scrolly[0];

	const uint16_t *source = &spriteram16[0x0000];
	const uint16_t *finish = &spriteram16[0x1800];

	set_sprite_timer();
	memset(&spriteram16[0x1800],0xff,0x800*sizeof(uint16_t));

	while( source<finish )
	{
		uint16_t priority = source[0];
		if( priority & 0x8000 )
		{
			uint16_t *dest = &spriteram16[0x1800|(priority&0xff)<<2];

			uint32_t xpos = (0x10000*source[4])|source[5];
			uint32_t ypos = (0x10000*source[6])|source[7];

			/* notes on sprite attributes:

			The only inputs from the sprite hardware into the mixer PAL are four bits of
			pixel data, with 0000 being transparent, 1111 being shadow, and anything else
			opaque. Sprite to background priority, and whether shadows are visible, depends
			entirely on the priority mode bits in m_video_register and on the underlying
			background pixel, and not on any of the sprite attribute bits.

			Shadows in the devilw lava stages look a bit strange; the shadows "punch holes"
			in the platforms and reveal the lava underneath. As far as I can tell from the
			schematics this has to be correct; unlike later Konami hardware there seems to
			be no way for a sprite to cast a shadow onto another sprite.

			fround, hpuncher, miaj, cuebrickj, don't use the preprocessor.
			*/
			uint16_t attributes = 0x8000 | (source[2]&0x03ff); // scale,size,color

			dest[0] = source[3]; /* gfx data */
			dest[1] = ((xpos>>8) - dx)&0xffff;
			dest[2] = ((ypos>>8) - dy)&0xffff;
			dest[3] = attributes;
		}
		source += 0x50/2;
	}
	m_need_process_spriteram = 0;
}

void twin16_state::draw_sprites( screen_device &screen, bitmap_ind16 &bitmap )
{
	const uint16_t *source = 0x1800+m_spriteram->buffer() + 0x800 - 4;
	const uint16_t *finish = 0x1800+m_spriteram->buffer();

	for (; source >= finish; source -= 4)
	{
		uint16_t attributes = source[3];
		uint16_t code = source[0];

		if((code!=0xffff) && (attributes&0x8000))
		{
			int xpos = source[1];
			int ypos = source[2];
			int x,y;

			int pal_base = ((attributes&0xf)+0x10)*16;
			int height  = 16<<((attributes>>6)&0x3);
			int width   = 16<<((attributes>>4)&0x3);
			const uint16_t *pen_data = nullptr;
			int flipy = attributes&0x0200;
			int flipx = attributes&0x0100;

			if( m_is_fround ) {
				/* fround board */
				pen_data = m_gfxrom;
			}
			else
			{
				switch( (code>>12)&0x3 )
				{
					/* bank select */
					case 0:
						pen_data = m_gfxrom;
						break;

					case 1:
						pen_data = m_gfxrom + 0x40000;
						break;

					case 2:
						pen_data = m_gfxrom + 0x80000;
						if( code&0x4000 ) pen_data += 0x40000;
						break;

					case 3:
						pen_data = m_sprite_gfx_ram;
						break;
				}
				code &= 0xfff;
			}

			/* some code masking */
			if ((height&width) == 64) code &= ~8;       // gradius2 ending sequence 64*64
			else if ((height&width) == 32) code &= ~3;  // devilw 32*32
			else if ((height|width) == 48) code &= ~1;  // devilw 32*16 / 16*32

			pen_data += code*0x40;

			if( m_video_register&TWIN16_SCREEN_FLIPY )
			{
				if (ypos>65000) ypos=ypos-65536; /* Bit hacky */
				ypos = 256-ypos-height;
				flipy = !flipy;
			}
			if( m_video_register&TWIN16_SCREEN_FLIPX )
			{
				if (xpos>65000) xpos=xpos-65536; /* Bit hacky */
				xpos = 320-xpos-width;
				flipx = !flipx;
			}
			if( xpos>=320 ) xpos -= 65536;
			if( ypos>=256 ) ypos -= 65536;

			/* slow slow slow, but it's ok for now */
			for( y=0; y<height; y++, pen_data += width/4 )
			{
				int sy = (flipy)?(ypos+height-1-y):(ypos+y);
				if( sy>=16 && sy<256-16 )
				{
					uint16_t *dest = &bitmap.pix16(sy);
					uint8_t *pdest = &screen.priority().pix8(sy);

					for( x=0; x<width; x++ )
					{
						int sx = (flipx)?(xpos+width-1-x):(xpos+x);
						if( sx>=0 && sx<320 )
						{
							uint16_t pen = pen_data[x>>2]>>((~x&3)<<2)&0xf;

							if( pen && !(pdest[sx] & TWIN16_SPRITE_OCCUPIED))
							{
								pdest[sx] |= TWIN16_SPRITE_OCCUPIED;

								if (pen==0xf) // shadow
								{
									if (!(pdest[sx] & TWIN16_BG_NO_SHADOW))
										dest[sx] = m_palette->shadow_table()[dest[sx]];
								}
								else // opaque pixel
								{
									if (!(pdest[sx] & TWIN16_BG_OVER_SPRITES))
										dest[sx] = pal_base + pen;
								}
							}
						}
					}
				}
			}
		}
	}
}


TILE_GET_INFO_MEMBER(twin16_state::fix_tile_info)
{
	int attr = m_fixram[tile_index];
	/* fedcba9876543210
	   -x-------------- yflip
	   --x------------- xflip
	   ---xxxx--------- color
	   -------xxxxxxxxx tile number
	*/
	int code = attr & 0x1ff;
	int color = (attr >> 9) & 0x0f;
	int flags=0;

	if (attr&0x2000) flags|=TILE_FLIPX;
	if (attr&0x4000) flags|=TILE_FLIPY;

	SET_TILE_INFO_MEMBER(0, code, color, flags);
}

void twin16_state::tile_get_info(tile_data &tileinfo, uint16_t data, int color_base)
{
	/* fedcba9876543210
	   xxx------------- color; high bit is also priority over sprites
	   ---xxxxxxxxxxxxx tile number
	*/
	int code = (data & 0x1fff);
	int color = color_base + (data >> 13);
	int flags = 0;
	if (m_video_register & TWIN16_TILE_FLIPY) flags |= TILE_FLIPY;
	SET_TILE_INFO_MEMBER(1, code, color, flags);
	tileinfo.category = BIT(data, 15);
}

void fround_state::tile_get_info(tile_data &tileinfo, uint16_t data, int color_base)
{
	/* fedcba9876543210
	   xxx------------- color; high bit is also priority over sprites
	   ---xx----------- tile bank
	   -----xxxxxxxxxxx tile number
	*/
	int bank = (data >> 11) & 3;
	int code = (m_gfx_bank[bank] << 11) | (data & 0x7ff);
	int color = color_base | (data >> 13);
	int flags = 0;
	if (m_video_register & TWIN16_TILE_FLIPY) flags |= TILE_FLIPY;
	SET_TILE_INFO_MEMBER(1, code, color, flags);
	tileinfo.category = BIT(data, 15);
}

TILE_GET_INFO_MEMBER(twin16_state::layer0_tile_info)
{
	tile_get_info(tileinfo, m_videoram[0][tile_index], 0);
}

TILE_GET_INFO_MEMBER(twin16_state::layer1_tile_info)
{
	tile_get_info(tileinfo, m_videoram[1][tile_index], 8);
}

void twin16_state::video_start()
{
	m_fixed_tmap = &machine().tilemap().create(*m_gfxdecode,tilemap_get_info_delegate(*this, FUNC(twin16_state::fix_tile_info)), TILEMAP_SCAN_ROWS, 8,8, 64,32);
	m_scroll_tmap[0] = &machine().tilemap().create(*m_gfxdecode,tilemap_get_info_delegate(*this, FUNC(twin16_state::layer0_tile_info)), TILEMAP_SCAN_ROWS, 8,8, 64,64);
	m_scroll_tmap[1] = &machine().tilemap().create(*m_gfxdecode,tilemap_get_info_delegate(*this, FUNC(twin16_state::layer1_tile_info)), TILEMAP_SCAN_ROWS, 8,8, 64,64);

	m_fixed_tmap->set_transparent_pen(0);
	m_scroll_tmap[0]->set_transparent_pen(0);
	m_scroll_tmap[1]->set_transparent_pen(0);

	m_palette->set_shadow_factor(0.4); // screenshots estimate

	memset(m_sprite_buffer,0xff,0x800*sizeof(uint16_t));
	m_video_register = 0;
	m_sprite_busy = 0;
	m_sprite_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(twin16_state::sprite_tick),this));
	m_sprite_timer->adjust(attotime::never);

	/* register for savestates */
	save_item(NAME(m_sprite_buffer));
	save_item(NAME(m_scrollx));
	save_item(NAME(m_scrolly));

	save_item(NAME(m_need_process_spriteram));
	save_item(NAME(m_video_register));
	save_item(NAME(m_sprite_busy));

	if (!m_is_fround)
		machine().save().register_postload(save_prepost_delegate(FUNC(twin16_state::twin16_postload), this));
}

void fround_state::video_start()
{
	twin16_state::video_start();
	save_item(NAME(m_gfx_bank));
}

uint32_t twin16_state::screen_update_twin16(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
/*
    PAL equations (007789 @ 11J):

    /SHAD = /FIX * /PRI1 * OCO0 * OCO1 * OCO2 * OCO3
          + /FIX * /PRI0 * OCO0 * OCO1 * OCO2 * OCO3 * /V1C0
          + /FIX * PRI0 * OCO0 * OCO1 * OCO2 * OCO3 * /V2C6
          + /FIX * PRI0 * /V2C0 * /V2C3 * OCO0 * /V2C2 * OCO1 * /V2C1 * OCO2 * OCO3

    /SELB = /FIX * OCO0 * OCO1 * OCO2 * OCO3
          + /FIX * /OCO0 * /OCO1 * /OCO2 * /OCO3
          + /FIX * PRI0 * /PRI1 * V1C0
          + /FIX * PRI0 * PRI1 * V2C0 * V2C6
          + /FIX * PRI0 * PRI1 * V2C1 * V2C6
          + /FIX * PRI0 * PRI1 * V2C2 * V2C6
          + /FIX * PRI0 * PRI1 * V2C3 * V2C6

     SELA = FIX
          + PRI0 * /PRI1 * V1C0
          + /PRI1 * OCO0 * OCO1 * OCO2 * OCO3 * V1C0
          + /PRI1 * /OCO0 * /OCO1 * /OCO2 * /OCO3 * V1C0
          + PRI1 * /V2C0 * /V2C3 * OCO0 * /V2C2 * OCO1 * /V2C1 * OCO2 * OCO3
          + PRI1 * /V2C0 * /V2C3 * /OCO0 * /V2C2 * /OCO1 * /V2C1 * /OCO2 * /OCO3

     SELB  SELA  Visible layer
      0     0    VRAM2
      0     1    VRAM1
      1     0    Object
      1     1    Fix

    Final Round uses a PROM (not dumped) instead of the PAL
    and some discrete logic to combine some of the inputs.
    Inputs to the PROM are:

    A0 = V1C0 | V1C1 | V1C2 | V1C3
    A1 = V2C0 | V2C1 | V2C2 | V2C3
    A2 = OCO0 | OCO1 | OCO2 | OCO3
    A3 = FIX0 | FIX1 | FIX2 | FIX3
    A4 = ~(OCD0 & OCD1 & OCD2 & OCD3)
    A5 = V2C6
    A6 = PRI0
    A7 = PRI1
*/
	screen.priority().fill(0, cliprect);

	switch ((m_video_register >> 2) & 0x3)
	{
		case 0: // PRI1 = 0, PRI0 = 0
			m_scroll_tmap[1]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_ALL_CATEGORIES | TILEMAP_DRAW_OPAQUE);
			m_scroll_tmap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_ALL_CATEGORIES);
			break;
		case 1: // PRI1 = 0, PRI0 = 1
			m_scroll_tmap[1]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_ALL_CATEGORIES | TILEMAP_DRAW_OPAQUE);
			m_scroll_tmap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_ALL_CATEGORIES, TWIN16_BG_OVER_SPRITES);
			break;
		case 2: // PRI1 = 1, PRI0 = 0
			m_scroll_tmap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_ALL_CATEGORIES | TILEMAP_DRAW_OPAQUE);
			m_scroll_tmap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_ALL_CATEGORIES, TWIN16_BG_NO_SHADOW);
			m_scroll_tmap[1]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_ALL_CATEGORIES);
			break;
		case 3: // PRI1 = 1, PRI0 = 1
			m_scroll_tmap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_ALL_CATEGORIES | TILEMAP_DRAW_OPAQUE);
			m_scroll_tmap[1]->draw(screen, bitmap, cliprect, 0);
			m_scroll_tmap[1]->draw(screen, bitmap, cliprect, 1, TWIN16_BG_OVER_SPRITES | TWIN16_BG_NO_SHADOW);
			break;
	}

	draw_sprites( screen, bitmap );

	m_fixed_tmap->draw(screen, bitmap, cliprect, 0);
	return 0;
}

WRITE_LINE_MEMBER(twin16_state::screen_vblank_twin16)
{
	// rising edge
	if (state)
	{
		set_sprite_timer();

		if (spriteram_process_enable()) {
			if (m_need_process_spriteram) spriteram_process();
			m_need_process_spriteram = 1;

			/* if the sprite preprocessor is used, sprite ram is copied to an external buffer first,
			as evidenced by 1-frame sprite lag in gradius2 and devilw otherwise, though there's probably
			more to it than that */
			memcpy(&m_spriteram->buffer()[0x1800],m_sprite_buffer,0x800*sizeof(uint16_t));
			memcpy(m_sprite_buffer,&m_spriteram->live()[0x1800],0x800*sizeof(uint16_t));
		}
		else {
			m_spriteram->copy();
		}

		// IRQ generation
		if (m_CPUA_register & 0x20)
			m_maincpu->set_input_line(5, HOLD_LINE);
		if (m_subcpu.found() && (m_CPUB_register & 0x02))
			m_subcpu->set_input_line(5, HOLD_LINE);
	}
}