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-rw-r--r--src/mame/includes/sms.h8
1 files changed, 6 insertions, 2 deletions
diff --git a/src/mame/includes/sms.h b/src/mame/includes/sms.h
index 502a8ed554e..30e3ed66d16 100644
--- a/src/mame/includes/sms.h
+++ b/src/mame/includes/sms.h
@@ -58,6 +58,8 @@ public:
m_led_pwr(*this, "led_pwr"),
m_region_maincpu(*this, "maincpu"),
m_mainram(nullptr),
+ m_left_lcd(*this, "left_lcd"),
+ m_right_lcd(*this, "right_lcd"),
m_is_gamegear(false),
m_is_smsj(false),
m_is_mark_iii(false),
@@ -117,6 +119,8 @@ public:
uint32_t screen_update_sms(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
uint32_t screen_update_sms1(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
+ uint32_t screen_update_sms1_left(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
+ uint32_t screen_update_sms1_right(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
uint32_t screen_update_gamegear(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
void screen_gg_sms_mode_scaling(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
DECLARE_WRITE_LINE_MEMBER(screen_vblank_sms1);
@@ -187,8 +191,8 @@ protected:
uint8_t *m_BIOS;
// for 3D glass binocular hack
- device_t *m_left_lcd;
- device_t *m_right_lcd;
+ optional_device<screen_device> m_left_lcd;
+ optional_device<screen_device> m_right_lcd;
bitmap_rgb32 m_prevleft_bitmap;
bitmap_rgb32 m_prevright_bitmap;
='#n137'>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
// license:???
// copyright-holders:Angelo Salese, David Haywood, Mike Green
/*******************************************************************************************

Diamond Derby - G4001 board (c) 1986 Electrocoin

driver by David Haywood,Mike Green & Angelo Salese

Notes:
-Press Collect Button to "get the money";

TODO:
-Enters into Service Mode (?) if you let it go in attract mode after some time;
-Fix remaining graphic issues;
-Fix colors (check bar test on the first Service Mode menu);
============================================================================================

G4001
Diamond Derby - Electrocoin on an SNK board

SWP gambling game base on horse racing

SNK/Electrocoin 1986
Re-released in 1994 (see dderbya) for changed uk gaming rules.

--------------------------------------------
G4001UP01

SWA SWB   C1        DD1
                    DD2

                6116              DD4
                          Z80     DD5
                                  DD6
                          DD3     6116
             8910  Z80    6116    6116

---------------------------------------------
G4001UP02

DD7  DD11  DD15           K1
DD8  DD12  DD16                   DD19
DD9  DD13  DD17                   DD20
DD10 DD14  DD18     H5            DD21


                                  DD22
                                  DD23
 2114                  2148 2148
 2114              H10

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

#include "emu.h"
#include "cpu/z80/z80.h"
#include "sound/ay8910.h"
#include "machine/nvram.h"
#include "video/resnet.h"


class dmndrby_state : public driver_device
{
public:
	dmndrby_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_scroll_ram(*this, "scroll_ram"),
		m_sprite_ram(*this, "sprite_ram"),
		m_dderby_vidchars(*this, "vidchars"),
		m_dderby_vidattribs(*this, "vidattribs"),
		m_maincpu(*this, "maincpu"),
		m_audiocpu(*this, "audiocpu"),
		m_gfxdecode(*this, "gfxdecode"),
		m_palette(*this, "palette") { }

	required_shared_ptr<UINT8> m_scroll_ram;
	required_shared_ptr<UINT8> m_sprite_ram;
	required_shared_ptr<UINT8> m_dderby_vidchars;
	required_shared_ptr<UINT8> m_dderby_vidattribs;
	UINT8 *m_racetrack_tilemap_rom;
	tilemap_t *m_racetrack_tilemap;
	UINT8 m_io_port[8];
	int m_bg;
	DECLARE_WRITE8_MEMBER(dderby_sound_w);
	DECLARE_READ8_MEMBER(input_r);
	DECLARE_WRITE8_MEMBER(output_w);
	TILE_GET_INFO_MEMBER(get_dmndrby_tile_info);
	virtual void video_start();
	DECLARE_PALETTE_INIT(dmndrby);
	UINT32 screen_update_dderby(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	INTERRUPT_GEN_MEMBER(dderby_irq);
	INTERRUPT_GEN_MEMBER(dderby_timer_irq);
	required_device<cpu_device> m_maincpu;
	required_device<cpu_device> m_audiocpu;
	required_device<gfxdecode_device> m_gfxdecode;
	required_device<palette_device> m_palette;
};


WRITE8_MEMBER(dmndrby_state::dderby_sound_w)
{
	soundlatch_byte_w(space,0,data);
	m_audiocpu->set_input_line(0, HOLD_LINE);
}


READ8_MEMBER(dmndrby_state::input_r)
{
	switch(offset & 7)
	{
		case 0: return ioport("IN0")->read();
		case 1: return ioport("IN1")->read();
		case 2: return ioport("IN2")->read();
		case 3: return ioport("IN3")->read();
		case 4: return ioport("IN4")->read();
		case 5: return ioport("IN5")->read();
		case 6: return ioport("IN6")->read();
		case 7: return ioport("IN7")->read();
	}

	return 0xff;
}

WRITE8_MEMBER(dmndrby_state::output_w)
{
	/*
	---- x--- refill meter [4]
	---- x--- token out meter [5]
	---- x--- token in meter [6]
	---- x--- cash out meter [7]
	---- -x-- coin out (meter) [0-3]
	---- -x-- coin lockout token [4]
	---- -x-- coin counter (meter) [5]
	---- --x- coin lockout [0-3]
	---- ---x lamp [0-6]
	*/
	m_io_port[offset] = data;
//  popmessage("%02x|%02x|%02x|%02x|%02x|%02x|%02x|%02x|",m_io_port[0],m_io_port[1],m_io_port[2],m_io_port[3],m_io_port[4],m_io_port[5],m_io_port[6],m_io_port[7]);
}

static ADDRESS_MAP_START( memmap, AS_PROGRAM, 8, dmndrby_state )
	AM_RANGE(0x0000, 0x5fff) AM_ROM
	AM_RANGE(0x8000, 0x8fff) AM_RAM AM_SHARE("nvram")
	AM_RANGE(0xc000, 0xc007) AM_READ(input_r)
	AM_RANGE(0xc000, 0xc007) AM_WRITE(output_w)
	AM_RANGE(0xc802, 0xc802) AM_READ_PORT("DSW1")
	AM_RANGE(0xc803, 0xc803) AM_READ_PORT("DSW2")
	AM_RANGE(0xca00, 0xca00) AM_WRITENOP//(vblank_irq_w) //???
	AM_RANGE(0xca01, 0xca01) AM_WRITENOP //watchdog
	AM_RANGE(0xca02, 0xca02) AM_RAM_WRITE(dderby_sound_w)
	AM_RANGE(0xca03, 0xca03) AM_WRITENOP//(timer_irq_w) //???
	AM_RANGE(0xcc00, 0xcc05) AM_RAM AM_SHARE("scroll_ram")
	AM_RANGE(0xce08, 0xce1f) AM_RAM AM_SHARE("sprite_ram") // horse sprites
	AM_RANGE(0xd000, 0xd3ff) AM_RAM AM_SHARE("vidchars") // char ram
	AM_RANGE(0xd400, 0xd7ff) AM_RAM AM_SHARE("vidattribs") // colours/ attrib ram
ADDRESS_MAP_END

static ADDRESS_MAP_START( dderby_sound_map, AS_PROGRAM, 8, dmndrby_state )
	AM_RANGE(0x0000, 0x0fff) AM_ROM
	AM_RANGE(0x1000, 0x1000) AM_RAM //???
	AM_RANGE(0x4000, 0x4001) AM_DEVWRITE("ay1", ay8910_device, address_data_w)
	AM_RANGE(0x4000, 0x4000) AM_READ(soundlatch_byte_r)
	AM_RANGE(0x4001, 0x4001) AM_DEVREAD("ay1", ay8910_device, data_r)
	AM_RANGE(0x6000, 0x67ff) AM_RAM
ADDRESS_MAP_END

static INPUT_PORTS_START( dderby )
	PORT_START("IN0")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN4 )
	PORT_DIPNAME( 0x0002, 0x0002, "Out Coin 1" )//out coin 1
	PORT_DIPSETTING(      0x0002, DEF_STR( Off ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON5 ) PORT_NAME("BET Horse 5")  PORT_CODE(KEYCODE_B)
	PORT_BIT( 0xf4, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("IN1")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN3 )
	PORT_DIPNAME( 0x0002, 0x0002, "Out Coin 2" )//out coin 2
	PORT_DIPSETTING(      0x0002, DEF_STR( Off ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON6 ) PORT_NAME("BET Horse 6")  PORT_CODE(KEYCODE_N)
	PORT_BIT( 0xf4, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("IN2")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_DIPNAME( 0x0002, 0x0002, "Out Coin 3" )//out coin 3
	PORT_DIPSETTING(      0x0002, DEF_STR( Off ) )
	PORT_DIPSETTING(      0x0000, DEF_STR( On ) )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_SERVICE1 ) PORT_NAME("Collect")  PORT_CODE(KEYCODE_2_PAD) //to get coins
	PORT_BIT( 0xf4, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("IN3")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0xfe, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("IN4")
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_SERVICE2 ) PORT_NAME("Refill Key")  PORT_CODE(KEYCODE_1_PAD)
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON4 ) PORT_NAME("BET Horse 4")  PORT_CODE(KEYCODE_V)
	PORT_BIT( 0xf5, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("IN5")
	PORT_SERVICE_NO_TOGGLE( 0x02, IP_ACTIVE_LOW )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON3 ) PORT_NAME("BET Horse 3")  PORT_CODE(KEYCODE_C)
	PORT_BIT( 0xf5, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("IN6")
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_SERVICE3 ) PORT_NAME("Back Door")  PORT_CODE(KEYCODE_3_PAD)
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON2 ) PORT_NAME("BET Horse 2")  PORT_CODE(KEYCODE_X)
	PORT_BIT( 0xf5, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("IN7")
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_OTHER ) PORT_NAME("Token Coin")  PORT_CODE(KEYCODE_0)
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_NAME("BET Horse 1")  PORT_CODE(KEYCODE_Z)
	PORT_BIT( 0xf5, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("DSW1")
	PORT_DIPNAME( 0x01, 0x01, " Unknown 1-1")
	PORT_DIPSETTING(    0x01, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x08, 0x08, " Unknown 1-2" )
	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x06, 0x00, "Max Prize" )
	PORT_DIPSETTING(    0x06, "240p (cash)" )
	PORT_DIPSETTING(    0x02, "300p (cash)" )
	PORT_DIPSETTING(    0x04, "480p (cash + tokens)" )
	PORT_DIPSETTING(    0x00, "600p (cash + tokens)" )
	PORT_DIPNAME( 0x30, 0x00, "Percentage Payout" )
	PORT_DIPSETTING(    0x00, "76%" )   PORT_CONDITION("DSW1", 0xc0, LESSTHAN, 0x80)
	PORT_DIPSETTING(    0x10, "80%" )   PORT_CONDITION("DSW1", 0xc0, LESSTHAN, 0x80)
	PORT_DIPSETTING(    0x20, "86%" )   PORT_CONDITION("DSW1", 0xc0, LESSTHAN, 0x80)
	PORT_DIPSETTING(    0x30, "88%" )   PORT_CONDITION("DSW1", 0xc0, LESSTHAN, 0x80)
	PORT_DIPSETTING(    0x00, "78%" )   PORT_CONDITION("DSW1", 0xc0, NOTLESSTHAN, 0x80)
	PORT_DIPSETTING(    0x10, "82%" )   PORT_CONDITION("DSW1", 0xc0, NOTLESSTHAN, 0x80)
	PORT_DIPSETTING(    0x20, "86%" )   PORT_CONDITION("DSW1", 0xc0, NOTLESSTHAN, 0x80)
	PORT_DIPSETTING(    0x30, "90%" )   PORT_CONDITION("DSW1", 0xc0, NOTLESSTHAN, 0x80)
	PORT_DIPNAME( 0xc0, 0x80, "Price Per Game" )
	PORT_DIPSETTING(    0x00, "2p" )
	PORT_DIPSETTING(    0x40, "5p" )
	PORT_DIPSETTING(    0x80, "10p" )
	PORT_DIPSETTING(    0xc0, "20p" )

	PORT_START("DSW2")  /* 8bit */
	PORT_DIPNAME( 0x01, 0x01, "Show Results")
	PORT_DIPSETTING(    0x01, "Last Race" )
	PORT_DIPSETTING(    0x00, "Last 6 Races" )
	PORT_DIPNAME( 0x02, 0x02, " Unknown 2-2" )
	PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x04, 0x04, " Unknown 2-3" )
	PORT_DIPSETTING(    0x04, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x08, 0x08, " Unknown 2-4" )
	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x10, 0x10, " Unknown 2-5")
	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x20, 0x20, " Unknown 2-6" )
	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x40, 0x40, " Unknown 2-7" )
	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x80, 0x80, " Unknown 2-8" )
	PORT_DIPSETTING(    0x80, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
INPUT_PORTS_END

static INPUT_PORTS_START( dderbya )
	PORT_INCLUDE( dderby )
	PORT_MODIFY("DSW1") /* 8bit */
	PORT_DIPNAME( 0x01, 0x01, "Price Per Play")
	PORT_DIPSETTING(    0x01, "5p" )
	PORT_DIPSETTING(    0x00, "10p" )
	PORT_DIPNAME( 0x06, 0x02, "Max Prize" )
	PORT_DIPSETTING(    0x00, "400p (cash + tokens)" )
	PORT_DIPSETTING(    0x04, "300p (cash + tokens)" )
	PORT_DIPSETTING(    0x02, "200p (cash)" )
	PORT_DIPSETTING(    0x06, "150p (cash)" )
	PORT_DIPNAME( 0x18, 0x08, "Percentage" )
	PORT_DIPSETTING(    0x00, "76%" )
	PORT_DIPSETTING(    0x08, "80%" )
	PORT_DIPSETTING(    0x10, "84%" )
	PORT_DIPSETTING(    0x18, "88%" )
	PORT_DIPNAME( 0x20, 0x20, " Unknown 1-2" )
	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x40, 0x40, " Unknown 1-3" )
	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x80, 0x80, " Unknown 1-4" )
	PORT_DIPSETTING(    0x80, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
INPUT_PORTS_END

static const gfx_layout tiles8x8_layout =
{
	8,8,
	RGN_FRAC(1,2),
	3,
	{ RGN_FRAC(1,2),4,0 },
	{ 0, 1, 2, 3,8,9,10,11 },
	{ 0*16, 1*16, 2*16, 3*16, 4*16, 5*16, 6*16, 7*16 },
	16*8
};

static const gfx_layout tiles16x16_layout =
{
	16,16,  /* 16*16 sprites */
	RGN_FRAC(1,3),  /* 256 sprites */
	3,      /* 3 bits per pixel */
	{ 0, RGN_FRAC(1,3), RGN_FRAC(2,3) },    // the three bitplanes are separated
	{ 0, 1, 2, 3, 4, 5, 6, 7,  16*8+0, 16*8+1, 16*8+2, 16*8+3, 16*8+4, 16*8+5, 16*8+6, 16*8+7 },
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
	32*8    // every sprite takes 32 consecutive bytes

};

static const gfx_layout tiles8x8_layout2 =
{
	8,8, // 8x8 chars
	RGN_FRAC(1,3),
	3,
	{ 0,RGN_FRAC(1,3),RGN_FRAC(2,3) },
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	{0*8,1*8,2*8,3*8,4*8,5*8,6*8,7*8},
	8*8,
};

static GFXDECODE_START( dmndrby )
	GFXDECODE_ENTRY( "gfx1", 0, tiles8x8_layout, 32*16, 32 )
	GFXDECODE_ENTRY( "gfx2", 0, tiles8x8_layout2, 0, 8)
	GFXDECODE_ENTRY( "gfx3", 0, tiles16x16_layout, 16*16, 32 )
GFXDECODE_END

TILE_GET_INFO_MEMBER(dmndrby_state::get_dmndrby_tile_info)
{
	int code = m_racetrack_tilemap_rom[tile_index];
	int attr = m_racetrack_tilemap_rom[tile_index+0x2000];

	int col = attr&0x1f;
	int flipx = (attr&0x40)>>6;


	SET_TILE_INFO_MEMBER(2,
			code,
			col,
			TILE_FLIPYX(flipx) );
}


void dmndrby_state::video_start()
{
	m_racetrack_tilemap_rom = memregion("user1")->base();
	m_racetrack_tilemap = &machine().tilemap().create(m_gfxdecode, tilemap_get_info_delegate(FUNC(dmndrby_state::get_dmndrby_tile_info),this),TILEMAP_SCAN_ROWS,16,16, 16, 512);
	m_racetrack_tilemap->mark_all_dirty();

}

UINT32 dmndrby_state::screen_update_dderby(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	int x,y,count;
	int off,scrolly;
	gfx_element *gfx = m_gfxdecode->gfx(0);
	gfx_element *sprites = m_gfxdecode->gfx(1);
	gfx_element *track = m_gfxdecode->gfx(2);

	bitmap.fill(m_palette->black_pen(), cliprect);


/* Draw racetrack

racetrack seems to be stored in 4th and 5th prom.
can we draw it with the tilemap? maybe not, the layout is a litle strange

*/
//  base = m_scroll_ram[0];

	off=0x1900-(m_bg*0x100)+(m_scroll_ram[1])*0x100;
	scrolly = 0xff-(m_scroll_ram[0]);
	if(m_scroll_ram[1]==0xff) off=0x1800;
	for(x=0;x<16;x++) {
		for(y=0;y<16;y++) {
			int chr = m_racetrack_tilemap_rom[off];
			int col = m_racetrack_tilemap_rom[off+0x2000]&0x1f;
			int flipx = m_racetrack_tilemap_rom[off+0x2000]&0x40;
			track->opaque(bitmap,cliprect,chr,col,flipx,0,y*16+scrolly,x*16);
			// draw another bit of track
			// a rubbish way of doing it
			chr = m_racetrack_tilemap_rom[off-0x100];
			col = m_racetrack_tilemap_rom[off+0x1f00]&0x1f;
			flipx = m_racetrack_tilemap_rom[off+0x1f00]&0x40;
			track->opaque(bitmap,cliprect,chr,col,flipx,0,y*16-256+scrolly,x*16);
			off++;
		}
	}


//return 0;

/* draw sprites

 guess work  again! seems to work fine and horse labels match up
wouldnt like to say its the most effective way though...
 -- maybe they should be decoded as 'big sprites' instead?

*/
	for (count=5;count>=0;count-- )
	{
		int a=0;
		int b=0;
		int base = count*4;
		int sprx=m_sprite_ram[base+3];
		int spry=m_sprite_ram[base+2];
		//m_sprite_ram[base+1];
		int col = (m_sprite_ram[base+1]&0x1f);
		int anim = (m_sprite_ram[base]&0x3)*0x40; // animation frame - probably wrong but seems right
		int horse = (m_sprite_ram[base+1]&0x7)*8+7;  // horse label from 1 - 6

		for (a=0;a<8 ;a++)
		{
			for(b=0;b<7;b++) {
				sprites->transpen(bitmap,cliprect,anim+a*8+b,col,0,0,sprx+a*8,spry+b*8,0);
			}
		}
		// draw the horse number
		a=3;
		b=3;
		sprites->transpen(bitmap,cliprect,anim+horse,col,0,0,sprx+a*8,spry+b*8,0);


	}

	/*TODO: Fix / understand how the transparency works properly. */
	count=0;
	for (y=0;y<32;y++)
	{
		for(x=0;x<32;x++)
		{
			int tileno,bank,color;
			tileno=m_dderby_vidchars[count];
			bank=(m_dderby_vidattribs[count]&0x20)>>5;
			tileno|=(bank<<8);
			color=((m_dderby_vidattribs[count])&0x1f);

			gfx->transpen(bitmap,cliprect,tileno,color,0,0,x*8,y*8,(tileno == 0x38) ? 0 : -1);

			count++;
		}
	}


	return 0;
}

// copied from elsewhere. surely incorrect
PALETTE_INIT_MEMBER(dmndrby_state, dmndrby)
{
	const UINT8 *color_prom = memregion("proms")->base();
	static const int resistances_rg[3] = { 1000, 470, 220 };
	static const int resistances_b [2] = { 470, 220 };
	double rweights[3], gweights[3], bweights[2];
	int i;

	/* compute the color output resistor weights */
	compute_resistor_weights(0, 255, -1.0,
			3, &resistances_rg[0], rweights, 470, 0,
			3, &resistances_rg[0], gweights, 470, 0,
			2, &resistances_b[0],  bweights, 470, 0);

	/* create a lookup table for the palette */
	for (i = 0; i < 0x20; i++)
	{
		int bit0, bit1, bit2;
		int r, g, b;

		/* red component */
		bit0 = (color_prom[i] >> 0) & 0x01;
		bit1 = (color_prom[i] >> 1) & 0x01;
		bit2 = (color_prom[i] >> 2) & 0x01;
		r = combine_3_weights(rweights, bit0, bit1, bit2);

		/* green component */
		bit0 = (color_prom[i] >> 3) & 0x01;
		bit1 = (color_prom[i] >> 4) & 0x01;
		bit2 = (color_prom[i] >> 5) & 0x01;
		g = combine_3_weights(gweights, bit0, bit1, bit2);

		/* blue component */
		bit0 = (color_prom[i] >> 6) & 0x01;
		bit1 = (color_prom[i] >> 7) & 0x01;
		b = combine_2_weights(bweights, bit0, bit1);

		palette.set_indirect_color(i, rgb_t(r, g, b));
	}

	/* color_prom now points to the beginning of the lookup table */
	color_prom = memregion("proms2")->base();

	/* normal tiles use colors 0-15 */
	for (i = 0x000; i < 0x300; i++)
	{
		UINT8 ctabentry = color_prom[i];
		palette.set_pen_indirect(i, ctabentry);
	}
}

/*Main Z80 is IM 0,HW-latched irqs. */
INTERRUPT_GEN_MEMBER(dmndrby_state::dderby_irq)
{
	m_maincpu->set_input_line_and_vector(0, HOLD_LINE, 0xd7); /* RST 10h */
}

INTERRUPT_GEN_MEMBER(dmndrby_state::dderby_timer_irq)
{
	m_maincpu->set_input_line_and_vector(0, HOLD_LINE, 0xcf); /* RST 08h */
}

static MACHINE_CONFIG_START( dderby, dmndrby_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", Z80,4000000)         /* ? MHz */
	MCFG_CPU_PROGRAM_MAP(memmap)
	MCFG_CPU_VBLANK_INT_DRIVER("screen", dmndrby_state,  dderby_irq)
	MCFG_CPU_PERIODIC_INT_DRIVER(dmndrby_state, dderby_timer_irq,  244/2)

	MCFG_CPU_ADD("audiocpu", Z80, 4000000)  /* verified on schematics */
	MCFG_CPU_PROGRAM_MAP(dderby_sound_map)

	MCFG_QUANTUM_TIME(attotime::from_hz(6000))
	MCFG_NVRAM_ADD_0FILL("nvram")

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
	MCFG_SCREEN_SIZE(256, 256)
	MCFG_SCREEN_VISIBLE_AREA(0, 256-1, 16, 256-16-1)
	MCFG_SCREEN_UPDATE_DRIVER(dmndrby_state, screen_update_dderby)
	MCFG_SCREEN_PALETTE("palette")

	MCFG_GFXDECODE_ADD("gfxdecode", "palette", dmndrby)
	MCFG_PALETTE_ADD("palette", 0x300)
	MCFG_PALETTE_INDIRECT_ENTRIES(0x20)
	MCFG_PALETTE_INIT_OWNER(dmndrby_state, dmndrby)

	MCFG_SPEAKER_STANDARD_MONO("mono")

	MCFG_SOUND_ADD("ay1", AY8910, 1789750) // frequency guessed
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.35)
MACHINE_CONFIG_END


ROM_START( dmndrby )
	ROM_REGION( 0x10000, "maincpu", 0 ) /* main cpu */
	ROM_LOAD( "dd04.m6", 0x00000, 0x02000, CRC(a3cfd28e) SHA1(7ba14876fa4409634a699e049bce3bc457522932) )
	ROM_LOAD( "dd05.m7", 0x02000, 0x02000, CRC(16f7ac0b) SHA1(030b8c2b294a0287f3aaf72424304fc191315888) )
	ROM_LOAD( "dd06.m8", 0x04000, 0x02000, CRC(914ba8f5) SHA1(d1b3f3d5d2625e42ea6cb5c777942cec7faea58e) )

	ROM_REGION( 0x10000, "audiocpu", 0 ) /* sound cpu */
	ROM_LOAD( "dd03.j9", 0x00000, 0x01000, CRC(660f0cae) SHA1(b3b414e52342de877a5c20886a87002a63310a94) )

	ROM_REGION( 0x04000, "gfx1", 0 ) /* tiles */
	ROM_LOAD( "dd01.e1", 0x00000, 0x02000, CRC(2e120288) SHA1(0ea29aff07e956b19080f05bd18b427195694ce8) )
	ROM_LOAD( "dd02.e2", 0x02000, 0x02000, CRC(ca028c8c) SHA1(f882eea2191cf1f3ea57d49fd6862f98401555be) )

	ROM_REGION( 0x4000, "user1", 0 ) // tracerack data
	ROM_LOAD( "dd22.n6", 0x00000, 0x02000, CRC(db6b13fc) SHA1(3415deb2ffa86679e4f8abb644b75963e5368ba0) )
	ROM_LOAD( "dd23.n7", 0x02000, 0x02000, CRC(595fdb9b) SHA1(133d227bb156be52337da974e37973b049722e49) )

	ROM_REGION( 0x18000, "gfx2", 0 ) /* horse sprites (kinda) */
	ROM_LOAD( "dd07.b1", 0x00000, 0x02000, CRC(207a534a) SHA1(ddbd292f79cc9fb7bd9f0ee9874da87909147789) )
	ROM_LOAD( "dd08.b2", 0x02000, 0x02000, CRC(f380e2c4) SHA1(860a6557ae8b81d310c353f88f9194e1ffd551ec) )
	ROM_LOAD( "dd09.b3", 0x04000, 0x02000, CRC(68ebf74c) SHA1(959ee6c4ce700cff86af39442063dc79b8f8913e) )
	ROM_LOAD( "dd10.b5", 0x06000, 0x01000, CRC(38b1568a) SHA1(f7e04db49708dfc8c8512026d3460af0f3fb6780) )
	ROM_LOAD( "dd11.d1", 0x08000, 0x02000, CRC(fe615561) SHA1(808f703d0ca1576feb78f21c380e4006dd634a9c) )
	ROM_LOAD( "dd12.d2", 0x0a000, 0x02000, CRC(4df63aae) SHA1(a0b224fb1157fc25c21f9f0664bb8385e94e5c77) )
	ROM_LOAD( "dd13.d4", 0x0c000, 0x02000, CRC(cace0dfc) SHA1(41902f3ee2fa18798e3b441ee18f7b953d977b93) )
	ROM_LOAD( "dd14.d5", 0x0e000, 0x01000, CRC(2c602cbe) SHA1(78ffe79e3f2c4a3e9c6adc8f4635ed1a93528dc8) )
	ROM_LOAD( "dd15.e1", 0x10000, 0x02000, CRC(2ce23b64) SHA1(5cbeabc015cb167c7fd485ab4d9f1329bc2e94b3) )
	ROM_LOAD( "dd16.e2", 0x12000, 0x02000, CRC(6af9796c) SHA1(4cd818d488ac85fd6f8732fdca80cc29db86d3f4) )
	ROM_LOAD( "dd17.e4", 0x14000, 0x02000, CRC(b451cde2) SHA1(1c7340cc39d9beca1640c88000112c898d3de941) )
	ROM_LOAD( "dd18.e5", 0x16000, 0x01000, CRC(56228aaf) SHA1(74e96ebefc1b69310b23e47a35affbb7cd7d9acc) )

	ROM_REGION( 0x6000, "gfx3", 0 )
	ROM_LOAD( "dd19.n2", 0x00000, 0x02000, CRC(fd536051) SHA1(556dfe064eeb9be1db751410ec128385c463e706) )
	ROM_LOAD( "dd20.n3", 0x02000, 0x02000, CRC(1497e52f) SHA1(f08c20c97c8d2148fcc705297cf1129bc65c9b83) )
	ROM_LOAD( "dd21.n4", 0x04000, 0x02000, CRC(87605d44) SHA1(c985fb15eac7bcc89e92909cf588b5982d0cabd0) )

	ROM_REGION( 0x020, "proms", 0 ) // palette
	ROM_LOAD( "ddprom3.h5", 0x0000, 0x0020, CRC(aea3cff6) SHA1(1139dd52c127436873a674be8a14527190091a82) )

	ROM_REGION( 0x300, "proms2", 0 ) // lookup
	ROM_LOAD( "ddprom4.h10",0x0000, 0x0100, CRC(7280f000) SHA1(bfad2b547b8abe6c67928bec08e7d00431c539d5) ) // HORSES
	ROM_LOAD( "ddprom5.k1", 0x0100, 0x0100, CRC(15edbdac) SHA1(298640afb24830d32f54c0c7c5960d777f51f2bd) ) // TILES?
	ROM_LOAD( "ddprom1.c1", 0x0200, 0x0100, CRC(e1c2fa1b) SHA1(6b8b0b2c1ac4b2796070452c923ba96dd8b29048) ) // ???

	ROM_REGION( 0x200, "proms3", 0 ) // other
	ROM_LOAD( "ddprom2.j5", 0x0000, 0x0100, CRC(3e5402dc) SHA1(2f497333f49064c54995cec8919f3aebdc17e977) )
	ROM_LOAD( "ddprom6.m12",0x0100, 0x0100, CRC(7f677b7d) SHA1(946014cb01f5954a3cb196796741ee174a0de641) )
ROM_END

ROM_START( dmndrbya )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "dd4", 0x00000, 0x02000, CRC(29b06e0f) SHA1(301fc2fe25ce47c2ad5112f0b795cd6bae605071) )
	ROM_LOAD( "dd5", 0x02000, 0x02000, CRC(5299d020) SHA1(678d338d2cee5250154454be97456d5f80bb4759) )
	ROM_LOAD( "dd6", 0x04000, 0x02000, CRC(f7e30ec0) SHA1(bf898987366ee9def190e3575108395b0aaef2d6) )

	ROM_REGION( 0x10000, "audiocpu", 0 ) /* sound cpu */
	ROM_LOAD( "dd03.j9", 0x00000, 0x01000, CRC(660f0cae) SHA1(b3b414e52342de877a5c20886a87002a63310a94) )

	ROM_REGION( 0x04000, "gfx1", 0 )
	ROM_LOAD( "dd1", 0x00000, 0x02000, CRC(7fe475a6) SHA1(008bbaff87baad7f4c2497e40bf5e3fc95f993b4) )
	ROM_LOAD( "dd2", 0x02000, 0x02000, CRC(54def3ee) SHA1(fb88852ada2b5b555c0e8c0a082ed9978ff27434) )

	ROM_REGION( 0x4000, "user1", 0 ) // tracerack data
	ROM_LOAD( "dd22.n6", 0x00000, 0x02000, CRC(db6b13fc) SHA1(3415deb2ffa86679e4f8abb644b75963e5368ba0) )
	ROM_LOAD( "dd23.n7", 0x02000, 0x02000, CRC(595fdb9b) SHA1(133d227bb156be52337da974e37973b049722e49) )

	ROM_REGION( 0x18000, "gfx2", 0 )
	ROM_LOAD( "dd07.b1", 0x00000, 0x02000, CRC(207a534a) SHA1(ddbd292f79cc9fb7bd9f0ee9874da87909147789) )
	ROM_LOAD( "dd08.b2", 0x02000, 0x02000, CRC(f380e2c4) SHA1(860a6557ae8b81d310c353f88f9194e1ffd551ec) )
	ROM_LOAD( "dd09.b3", 0x04000, 0x02000, CRC(68ebf74c) SHA1(959ee6c4ce700cff86af39442063dc79b8f8913e) )
	ROM_LOAD( "dd10.b5", 0x06000, 0x01000, CRC(38b1568a) SHA1(f7e04db49708dfc8c8512026d3460af0f3fb6780) )
	ROM_LOAD( "dd11.d1", 0x08000, 0x02000, CRC(fe615561) SHA1(808f703d0ca1576feb78f21c380e4006dd634a9c) )
	ROM_LOAD( "dd12.d2", 0x0a000, 0x02000, CRC(4df63aae) SHA1(a0b224fb1157fc25c21f9f0664bb8385e94e5c77) )
	ROM_LOAD( "dd13.d4", 0x0c000, 0x02000, CRC(cace0dfc) SHA1(41902f3ee2fa18798e3b441ee18f7b953d977b93) )
	ROM_LOAD( "dd14.d5", 0x0e000, 0x01000, CRC(2c602cbe) SHA1(78ffe79e3f2c4a3e9c6adc8f4635ed1a93528dc8) )
	ROM_LOAD( "dd15.e1", 0x10000, 0x02000, CRC(2ce23b64) SHA1(5cbeabc015cb167c7fd485ab4d9f1329bc2e94b3) )
	ROM_LOAD( "dd16.e2", 0x12000, 0x02000, CRC(6af9796c) SHA1(4cd818d488ac85fd6f8732fdca80cc29db86d3f4) )
	ROM_LOAD( "dd17.e4", 0x14000, 0x02000, CRC(b451cde2) SHA1(1c7340cc39d9beca1640c88000112c898d3de941) )
	ROM_LOAD( "dd18.e5", 0x16000, 0x01000, CRC(56228aaf) SHA1(74e96ebefc1b69310b23e47a35affbb7cd7d9acc) )

	ROM_REGION( 0x6000, "gfx3", 0 )
	ROM_LOAD( "dd19.n2", 0x00000, 0x02000, CRC(fd536051) SHA1(556dfe064eeb9be1db751410ec128385c463e706) )
	ROM_LOAD( "dd20.n3", 0x02000, 0x02000, CRC(1497e52f) SHA1(f08c20c97c8d2148fcc705297cf1129bc65c9b83) )
	ROM_LOAD( "dd21.n4", 0x04000, 0x02000, CRC(87605d44) SHA1(c985fb15eac7bcc89e92909cf588b5982d0cabd0) )

	ROM_REGION( 0x020, "proms", 0 ) // palette
	ROM_LOAD( "ddprom3.h5", 0x0000, 0x0020, CRC(aea3cff6) SHA1(1139dd52c127436873a674be8a14527190091a82) )

	ROM_REGION( 0x300, "proms2", 0 ) // lookup
	ROM_LOAD( "ddprom4.h10",0x0000, 0x0100, CRC(7280f000) SHA1(bfad2b547b8abe6c67928bec08e7d00431c539d5) ) // HORSES
	ROM_LOAD( "ddprom5.k1", 0x0100, 0x0100, CRC(15edbdac) SHA1(298640afb24830d32f54c0c7c5960d777f51f2bd) ) // TILES?
	ROM_LOAD( "ddprom1.c1", 0x0200, 0x0100, CRC(e1c2fa1b) SHA1(6b8b0b2c1ac4b2796070452c923ba96dd8b29048) ) // ???

	ROM_REGION( 0x200, "proms3", 0 ) // other
	ROM_LOAD( "ddprom2.j5", 0x0000, 0x0100, CRC(3e5402dc) SHA1(2f497333f49064c54995cec8919f3aebdc17e977) )
	ROM_LOAD( "ddprom6.m12",0x0100, 0x0100, CRC(7f677b7d) SHA1(946014cb01f5954a3cb196796741ee174a0de641) )
ROM_END


/*    YEAR, NAME,    PARENT,   MACHINE, INPUT,   INIT,    MONITOR, COMPANY,   FULLNAME */
GAME( 1994, dmndrby,  0,       dderby, dderby, driver_device,  0, ROT0, "Electrocoin", "Diamond Derby (Newer)",GAME_IMPERFECT_GRAPHICS|GAME_IMPERFECT_COLORS|GAME_NOT_WORKING ) // hack?
GAME( 1986, dmndrbya, dmndrby, dderby, dderbya, driver_device, 0, ROT0, "Electrocoin", "Diamond Derby (Original)",GAME_IMPERFECT_GRAPHICS|GAME_IMPERFECT_COLORS|GAME_NOT_WORKING )