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/user/games/xmame/xmame-0.106/src/drivers/dragrace.c

https://bitbucket.org/thelearninglabs/uclinux-distro-tll-public
C | 377 lines | 271 code | 64 blank | 42 comment | 8 complexity | 0d343e55e901df3753ab40d0463d0a73 MD5 | raw file
Possible License(s): LGPL-2.1, BSD-3-Clause, MPL-2.0-no-copyleft-exception, LGPL-3.0, Unlicense, GPL-2.0, GPL-3.0, CC-BY-SA-3.0, AGPL-1.0, ISC, MIT, 0BSD, LGPL-2.0 
    

  1. /***************************************************************************
    2. 

    3. 

  3. Atari Drag Race Driver
    4. 

    5. 

  5. ***************************************************************************/
    6. 

  6. 

  7. #include "driver.h"
    8. 

  8. #include "dragrace.h"
    9. 

  9. #include "sound/discrete.h"
    10. 

  10. 

  11. 

  12. static unsigned dragrace_misc_flags = 0;
    13. 

  13. 

  14. static int dragrace_gear[2];
    15. 

  15. 

  16. static void dragrace_frame_callback(int dummy)
    17. 

  17. {
    18. 

  18. 	int i;
    19. 

  19. 

  20. 	for (i = 0; i < 2; i++)
    21. 

  21. 	{
    22. 

  22. 		switch (readinputport(5 + i))
    23. 

  23. 		{
    24. 

  24. 		case 0x01: dragrace_gear[i] = 1; break;
    25. 

  25. 		case 0x02: dragrace_gear[i] = 2; break;
    26. 

  26. 		case 0x04: dragrace_gear[i] = 3; break;
    27. 

  27. 		case 0x08: dragrace_gear[i] = 4; break;
    28. 

  28. 		case 0x10: dragrace_gear[i] = 0; break;
    29. 

  29. 		}
    30. 

  30. 	}
    31. 

  31. 

  32. 	/* watchdog is disabled during service mode */
    33. 

  33. 		watchdog_enable(readinputport(0) & 0x20);
    34. 

  34. }
    35. 

  35. 

  36. 

  37. static MACHINE_RESET( dragrace )
    38. 

  38. {
    39. 

  39. 	timer_pulse(cpu_getscanlinetime(0), 0, dragrace_frame_callback);
    40. 

  40. }
    41. 

  41. 

  42. static void dragrace_update_misc_flags(void)
    43. 

  43. {
    44. 

  44. 	/* 0x0900 = set 3SPEED1         0x00000001
    45. 

  45.      * 0x0901 = set 4SPEED1         0x00000002
    46. 

  46.      * 0x0902 = set 5SPEED1         0x00000004
    47. 

  47.      * 0x0903 = set 6SPEED1         0x00000008
    48. 

  48.      * 0x0904 = set 7SPEED1         0x00000010
    49. 

  49.      * 0x0905 = set EXPLOSION1      0x00000020
    50. 

  50.      * 0x0906 = set SCREECH1        0x00000040
    51. 

  51.      * 0x0920 - 0x0927 = clear 0x0900 - 0x0907
    52. 

    53. 

  53.      * 0x0909 = set KLEXPL1         0x00000200
    54. 

  54.      * 0x090b = set MOTOR1          0x00000800
    55. 

  55.      * 0x090c = set ATTRACT         0x00001000
    56. 

  56.      * 0x090d = set LOTONE          0x00002000
    57. 

  57.      * 0x090f = set Player 1 Start Lamp 0x00008000
    58. 

  58.      * 0x0928 - 0x092f = clear 0x0908 - 0x090f
    59. 

    60. 

  60.      * 0x0910 = set 3SPEED2         0x00010000
    61. 

  61.      * 0x0911 = set 4SPEED2         0x00020000
    62. 

  62.      * 0x0912 = set 5SPEED2         0x00040000
    63. 

  63.      * 0x0913 = set 6SPEED2         0x00080000
    64. 

  64.      * 0x0914 = set 7SPEED2         0x00100000
    65. 

  65.      * 0x0915 = set EXPLOSION2      0x00200000
    66. 

  66.      * 0x0916 = set SCREECH2        0x00400000
    67. 

  67.      * 0x0930 = clear 0x0910 - 0x0917
    68. 

    69. 

  69.      * 0x0919 = set KLEXPL2         0x02000000
    70. 

  70.      * 0x091b = set MOTOR2          0x08000000
    71. 

  71.      * 0x091d = set HITONE          0x20000000
    72. 

  72.      * 0x091f = set Player 2 Start Lamp 0x80000000
    73. 

  73.      * 0x0938 = clear 0x0918 - 0x091f
    74. 

  74.      */
    75. 

  75. 	set_led_status(0, dragrace_misc_flags & 0x00008000);
    76. 

  76. 	set_led_status(1, dragrace_misc_flags & 0x80000000);
    77. 

  77. 

  78. 	discrete_sound_w(DRAGRACE_MOTOR1_DATA,  ~dragrace_misc_flags & 0x0000001f);		/* Speed1 data* */
    79. 

  79. 	discrete_sound_w(DRAGRACE_EXPLODE1_EN, (dragrace_misc_flags & 0x00000020) ? 1: 0);	/* Explosion1 enable */
    80. 

  80. 	discrete_sound_w(DRAGRACE_SCREECH1_EN, (dragrace_misc_flags & 0x00000040) ? 1: 0);	/* Screech1 enable */
    81. 

  81. 	discrete_sound_w(DRAGRACE_KLEXPL1_EN, (dragrace_misc_flags & 0x00000200) ? 1: 0);	/* KLEXPL1 enable */
    82. 

  82. 	discrete_sound_w(DRAGRACE_MOTOR1_EN, (dragrace_misc_flags & 0x00000800) ? 1: 0);	/* Motor1 enable */
    83. 

  83. 

  84. 	discrete_sound_w(DRAGRACE_MOTOR2_DATA, (~dragrace_misc_flags & 0x001f0000) >> 0x10);	/* Speed2 data* */
    85. 

  85. 	discrete_sound_w(DRAGRACE_EXPLODE2_EN, (dragrace_misc_flags & 0x00200000) ? 1: 0);	/* Explosion2 enable */
    86. 

  86. 	discrete_sound_w(DRAGRACE_SCREECH2_EN, (dragrace_misc_flags & 0x00400000) ? 1: 0);	/* Screech2 enable */
    87. 

  87. 	discrete_sound_w(DRAGRACE_KLEXPL2_EN, (dragrace_misc_flags & 0x02000000) ? 1: 0);	/* KLEXPL2 enable */
    88. 

  88. 	discrete_sound_w(DRAGRACE_MOTOR2_EN, (dragrace_misc_flags & 0x08000000) ? 1: 0);	/* Motor2 enable */
    89. 

  89. 

  90. 	discrete_sound_w(DRAGRACE_ATTRACT_EN, (dragrace_misc_flags & 0x00001000) ? 1: 0);	/* Attract enable */
    91. 

  91. 	discrete_sound_w(DRAGRACE_LOTONE_EN, (dragrace_misc_flags & 0x00002000) ? 1: 0);	/* LoTone enable */
    92. 

  92. 	discrete_sound_w(DRAGRACE_HITONE_EN, (dragrace_misc_flags & 0x20000000) ? 1: 0);	/* HiTone enable */
    93. 

  93. }
    94. 

  94. 

  95. WRITE8_HANDLER( dragrace_misc_w )
    96. 

  96. {
    97. 

  97. 	/* Set/clear individual bit */
    98. 

  98. 	UINT32 mask = 1 << offset;
    99. 

  99. 	if (data & 0x01)
    100. 

  100. 		dragrace_misc_flags |= mask;
    101. 

  101. 	else
    102. 

  102. 		dragrace_misc_flags &= (~mask);
    103. 

  103. 	logerror("Set   %#6x, Mask=%#10x, Flag=%#10x, Data=%x\n", 0x0900+offset, mask, dragrace_misc_flags, data & 0x01);
    104. 

  104. 	dragrace_update_misc_flags();
    105. 

  105. 	}
    106. 

  106. 

  107. WRITE8_HANDLER( dragrace_misc_clear_w )
    108. 

  108. {
    109. 

  109. 	/* Clear 8 bits */
    110. 

  110. 	UINT32 mask = 0xff << (((offset >> 3) & 0x03) * 8);
    111. 

  111. 	dragrace_misc_flags &= (~mask);
    112. 

  112. 	logerror("Clear %#6x, Mask=%#10x, Flag=%#10x, Data=%x\n", 0x0920+offset, mask, dragrace_misc_flags, data & 0x01);
    113. 

  113. 	dragrace_update_misc_flags();
    114. 

  114. }
    115. 

  115. 

  116. READ8_HANDLER( dragrace_input_r )
    117. 

  117. {
    118. 

  118. 	int val = readinputport(2);
    119. 

  119. 

  120. 	UINT8 maskA = 1 << (offset % 8);
    121. 

  121. 	UINT8 maskB = 1 << (offset / 8);
    122. 

  122. 

  123. 	int i;
    124. 

  124. 

  125. 	for (i = 0; i < 2; i++)
    126. 

  126. 	{
    127. 

  127. 		int in = readinputport(i);
    128. 

  128. 

  129. 		if (dragrace_gear[i] != 0)
    130. 

  130. 		{
    131. 

  131. 			in &= ~(1 << dragrace_gear[i]);
    132. 

  132. 		}
    133. 

  133. 

  134. 		if (in & maskA)
    135. 

  135. 		{
    136. 

  136. 			val |= 1 << i;
    137. 

  137. 		}
    138. 

  138. 	}
    139. 

  139. 

  140. 	return (val & maskB) ? 0xFF : 0x7F;
    141. 

  141. }
    142. 

  142. 

  143. 

  144. READ8_HANDLER( dragrace_steering_r )
    145. 

  145. {
    146. 

  146. 	int bitA[2];
    147. 

  147. 	int bitB[2];
    148. 

  148. 

  149. 	int i;
    150. 

  150. 

  151. 	for (i = 0; i < 2; i++)
    152. 

  152. 	{
    153. 

  153. 		int dial = readinputport(3 + i);
    154. 

  154. 

  155. 		bitA[i] = ((dial + 1) / 2) & 1;
    156. 

  156. 		bitB[i] = ((dial + 0) / 2) & 1;
    157. 

  157. 	}
    158. 

  158. 

  159. 	return
    160. 

  160. 		(bitA[0] << 0) | (bitB[0] << 1) |
    161. 

  161. 		(bitA[1] << 2) | (bitB[1] << 3);
    162. 

  162. }
    163. 

  163. 

  164. 

  165. READ8_HANDLER( dragrace_scanline_r )
    166. 

  166. {
    167. 

  167. 	return (cpu_getscanline() ^ 0xf0) | 0x0f;
    168. 

  168. }
    169. 

  169. 

  170. 

  171. static ADDRESS_MAP_START( dragrace_readmem, ADDRESS_SPACE_PROGRAM, 8 )
    172. 

  172. 	AM_RANGE(0x0080, 0x00ff) AM_READ(MRA8_RAM)
    173. 

  173. 	AM_RANGE(0x0800, 0x083f) AM_READ(dragrace_input_r)
    174. 

  174. 	AM_RANGE(0x0c00, 0x0c00) AM_READ(dragrace_steering_r)
    175. 

  175. 	AM_RANGE(0x0d00, 0x0d00) AM_READ(dragrace_scanline_r)
    176. 

  176. 	AM_RANGE(0x1000, 0x1fff) AM_READ(MRA8_ROM) /* program */
    177. 

  177. 	AM_RANGE(0xf800, 0xffff) AM_READ(MRA8_ROM) /* program mirror */
    178. 

  178. ADDRESS_MAP_END
    179. 

  179. 

  180. static ADDRESS_MAP_START( dragrace_writemem, ADDRESS_SPACE_PROGRAM, 8 )
    181. 

  181. 	AM_RANGE(0x0080, 0x00ff) AM_WRITE(MWA8_RAM)
    182. 

  182. 	AM_RANGE(0x0900, 0x091f) AM_WRITE(dragrace_misc_w)
    183. 

  183. 	AM_RANGE(0x0920, 0x093f) AM_WRITE(dragrace_misc_clear_w)
    184. 

  184. 	AM_RANGE(0x0a00, 0x0aff) AM_WRITE(MWA8_RAM) AM_BASE(&dragrace_playfield_ram)
    185. 

  185. 	AM_RANGE(0x0b00, 0x0bff) AM_WRITE(MWA8_RAM) AM_BASE(&dragrace_position_ram)
    186. 

  186. 	AM_RANGE(0x0e00, 0x0eff) AM_WRITE(watchdog_reset_w)
    187. 

  187. 	AM_RANGE(0x1000, 0x1fff) AM_WRITE(MWA8_ROM) /* program */
    188. 

  188. 	AM_RANGE(0xf800, 0xffff) AM_WRITE(MWA8_ROM) /* program mirror */
    189. 

  189. ADDRESS_MAP_END
    190. 

  190. 

  191. 

  192. INPUT_PORTS_START( dragrace )
    193. 

  193. 	PORT_START /* IN0 */
    194. 

  194. 	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_NAME("Player 1 Gas") PORT_PLAYER(1)
    195. 

  195. 	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNUSED ) /* player 1 gear 1 */
    196. 

  196. 	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNUSED ) /* player 1 gear 2 */
    197. 

  197. 	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNUSED ) /* player 1 gear 3 */
    198. 

  198. 	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNUSED ) /* player 1 gear 4 */
    199. 

  199. 	PORT_SERVICE( 0x20, IP_ACTIVE_LOW )
    200. 

  200. 	PORT_DIPNAME( 0xc0, 0x80, "Extended Play" )
    201. 

  201. 	PORT_DIPSETTING( 0x00, "6.9 seconds" )
    202. 

  202. 	PORT_DIPSETTING( 0x80, "5.9 seconds" )
    203. 

  203. 	PORT_DIPSETTING( 0x40, "4.9 seconds" )
    204. 

  204. 	PORT_DIPSETTING( 0xc0, "Never" )
    205. 

  205. 

  206. 	PORT_START /* IN1 */
    207. 

  207. 	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_NAME("Player 2 Gas") PORT_PLAYER(2)
    208. 

  208. 	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNUSED ) /* player 2 gear 1 */
    209. 

  209. 	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_UNUSED ) /* player 2 gear 2 */
    210. 

  210. 	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNUSED ) /* player 2 gear 3 */
    211. 

  211. 	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNUSED ) /* player 2 gear 4 */
    212. 

  212. 	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNUSED )
    213. 

  213. 	PORT_DIPNAME( 0xc0, 0x80, "Number Of Heats" )
    214. 

  214. 	PORT_DIPSETTING( 0xc0, "3" )
    215. 

  215. 	PORT_DIPSETTING( 0x80, "4" )
    216. 

  216. 	PORT_DIPSETTING( 0x00, "5" )
    217. 

  217. 

  218. 	PORT_START /* IN2 */
    219. 

  219. 	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_UNUSED ) /* IN0 connects here */
    220. 

  220. 	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNUSED ) /* IN1 connects here */
    221. 

  221. 	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_COIN1 )
    222. 

  222. 	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_COIN2 )
    223. 

  223. 	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_START1 )
    224. 

  224. 	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_START2 )
    225. 

  225. 	PORT_DIPNAME( 0xc0, 0x40, DEF_STR( Coinage ) )
    226. 

  226. 	PORT_DIPSETTING( 0xc0, DEF_STR( 2C_1C ) )
    227. 

  227. 	PORT_DIPSETTING( 0x40, DEF_STR( 1C_1C ) )
    228. 

  228. 	PORT_DIPSETTING( 0x80, DEF_STR( 1C_2C ) )
    229. 

  229. 	PORT_DIPSETTING( 0x00, DEF_STR( Free_Play ) )
    230. 

  230. 

  231. 	PORT_START /* IN3 */
    232. 

  232. 	PORT_BIT( 0xff, 0x00, IPT_DIAL_V ) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_PLAYER(1)
    233. 

  233. 

  234. 	PORT_START /* IN4 */
    235. 

  235. 	PORT_BIT( 0xff, 0x00, IPT_DIAL_V ) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_PLAYER(2)
    236. 

  236. 

  237. 	PORT_START /* IN5 */
    238. 

  238. 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("Player 1 Gear 1") PORT_PLAYER(1)
    239. 

  239. 	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_NAME("Player 1 Gear 2") PORT_PLAYER(1)
    240. 

  240. 	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_BUTTON4 ) PORT_NAME("Player 1 Gear 3") PORT_PLAYER(1)
    241. 

  241. 	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_BUTTON5 ) PORT_NAME("Player 1 Gear 4") PORT_PLAYER(1)
    242. 

  242. 	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_BUTTON6 ) PORT_NAME("Player 1 Neutral") PORT_PLAYER(1)
    243. 

  243. 

  244. 	PORT_START /* IN6 */
    245. 

  245. 	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_BUTTON2 ) PORT_NAME("Player 2 Gear 1") PORT_PLAYER(2)
    246. 

  246. 	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_BUTTON3 ) PORT_NAME("Player 2 Gear 2") PORT_PLAYER(2)
    247. 

  247. 	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_BUTTON4 ) PORT_NAME("Player 2 Gear 3") PORT_PLAYER(2)
    248. 

  248. 	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_BUTTON5 ) PORT_NAME("Player 2 Gear 4") PORT_PLAYER(2)
    249. 

  249. 	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_BUTTON6 ) PORT_NAME("Player 2 Neutral") PORT_PLAYER(2)
    250. 

  250. 

  251. 	PORT_START
    252. 

  252. 	PORT_ADJUSTER( 81, "Motor 1 RPM" )
    253. 

  253. 

  254. 	PORT_START
    255. 

  255. 	PORT_ADJUSTER( 85, "Motor 2 RPM" )
    256. 

  256. INPUT_PORTS_END
    257. 

  257. 

  258. 

  259. static const gfx_layout dragrace_tile_layout1 =
    260. 

  260. {
    261. 

  261. 	16, 16,   /* width, height */
    262. 

  262. 	0x40,     /* total         */
    263. 

  263. 	1,        /* planes        */
    264. 

  264. 	{ 0 },    /* plane offsets */
    265. 

  265. 	{
    266. 

  266. 		0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
    267. 

  267. 		0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87
    268. 

  268. 	},
    269. 

  269. 	{
    270. 

  270. 		0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38,
    271. 

  271. 		0x40, 0x48, 0x50, 0x58, 0x60, 0x68, 0x70, 0x78
    272. 

  272. 	},
    273. 

  273. 	0x100      /* increment */
    274. 

  274. };
    275. 

  275. 

  276. 

  277. static const gfx_layout dragrace_tile_layout2 =
    278. 

  278. {
    279. 

  279. 	16, 16,   /* width, height */
    280. 

  280. 	0x20,     /* total         */
    281. 

  281. 	2,        /* planes        */
    282. 

  282. 	{         /* plane offsets */
    283. 

  283. 		0x0000, 0x2000
    284. 

  284. 	},
    285. 

  285. 	{
    286. 

  286. 		0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
    287. 

  287. 		0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87
    288. 

  288. 	},
    289. 

  289. 	{
    290. 

  290. 		0x00, 0x08, 0x10, 0x18, 0x20, 0x28, 0x30, 0x38,
    291. 

  291. 		0x40, 0x48, 0x50, 0x58, 0x60, 0x68, 0x70, 0x78
    292. 

  292. 	},
    293. 

  293. 	0x100      /* increment */
    294. 

  294. };
    295. 

  295. 

  296. 

  297. static const gfx_decode dragrace_gfx_decode_info[] =
    298. 

  298. {
    299. 

  299. 	{ REGION_GFX1, 0, &dragrace_tile_layout1, 0, 4 },
    300. 

  300. 	{ REGION_GFX2, 0, &dragrace_tile_layout2, 8, 2 },
    301. 

  301. 	{ -1 } /* end of array */
    302. 

  302. };
    303. 

  303. 

  304. 

  305. static PALETTE_INIT( dragrace )
    306. 

  306. {
    307. 

  307. 	palette_set_color(0, 0xFF, 0xFF, 0xFF);   /* 2 color tiles */
    308. 

  308. 	palette_set_color(1, 0x00, 0x00, 0x00);
    309. 

  309. 	palette_set_color(2, 0x00, 0x00, 0x00);
    310. 

  310. 	palette_set_color(3, 0xFF, 0xFF, 0xFF);
    311. 

  311. 	palette_set_color(4, 0x00, 0x00, 0x00);
    312. 

  312. 	palette_set_color(5, 0x00, 0x00, 0x00);
    313. 

  313. 	palette_set_color(6, 0xFF, 0xFF, 0xFF);
    314. 

  314. 	palette_set_color(7, 0xFF, 0xFF, 0xFF);
    315. 

  315. 	palette_set_color(8, 0xFF, 0xFF, 0xFF);   /* 4 color tiles */
    316. 

  316. 	palette_set_color(9, 0xB0, 0xB0, 0xB0);
    317. 

  317. 	palette_set_color(10,0x5F, 0x5F, 0x5F);
    318. 

  318. 	palette_set_color(11,0x00, 0x00, 0x00);
    319. 

  319. 	palette_set_color(12,0xFF, 0xFF, 0xFF);
    320. 

  320. 	palette_set_color(13,0x5F, 0x5F, 0x5F);
    321. 

  321. 	palette_set_color(14,0xB0, 0xB0, 0xB0);
    322. 

  322. 	palette_set_color(15,0x00, 0x00, 0x00);
    323. 

  323. }
    324. 

  324. 

  325. 

  326. static MACHINE_DRIVER_START( dragrace )
    327. 

  327. 

  328. 	/* basic machine hardware */
    329. 

  329. 	MDRV_CPU_ADD(M6800, 12096000 / 12)
    330. 

  330. 	MDRV_CPU_PROGRAM_MAP(dragrace_readmem, dragrace_writemem)
    331. 

  331. 	MDRV_CPU_VBLANK_INT(irq0_line_hold, 4)
    332. 

  332. 	MDRV_WATCHDOG_VBLANK_INIT(8)
    333. 

  333. 	MDRV_FRAMES_PER_SECOND(60)
    334. 

  334. 	MDRV_VBLANK_DURATION((int) ((22. * 1000000) / (262. * 60) + 0.5))
    335. 

  335. 

  336. 	MDRV_MACHINE_RESET(dragrace)
    337. 

  337. 

  338. 	/* video hardware */
    339. 

  339. 	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER)
    340. 

  340. 	MDRV_SCREEN_SIZE(256, 240)
    341. 

  341. 	MDRV_VISIBLE_AREA(0, 255, 0, 239)
    342. 

  342. 	MDRV_GFXDECODE(dragrace_gfx_decode_info)
    343. 

  343. 	MDRV_PALETTE_LENGTH(16)
    344. 

  344. 	MDRV_PALETTE_INIT(dragrace)
    345. 

  345. 	MDRV_VIDEO_START(dragrace)
    346. 

  346. 	MDRV_VIDEO_UPDATE(dragrace)
    347. 

  347. 

  348. 	/* sound hardware */
    349. 

  349. 	MDRV_SPEAKER_STANDARD_STEREO("left", "right")
    350. 

  350. 

  351. 	MDRV_SOUND_ADD_TAG("discrete", DISCRETE, 0)
    352. 

  352. 	MDRV_SOUND_CONFIG(dragrace_discrete_interface)
    353. 

  353. 	MDRV_SOUND_ROUTE(0, "left", 1.0)
    354. 

  354. 	MDRV_SOUND_ROUTE(1, "right", 1.0)
    355. 

  355. MACHINE_DRIVER_END
    356. 

  356. 

  357. 

  358. ROM_START( dragrace )
    359. 

  359. 	ROM_REGION( 0x10000, REGION_CPU1, 0 )
    360. 

  360. 	ROM_LOAD( "8513.c1", 0x1000, 0x0800, CRC(543bbb30) SHA1(646a41d1124c8365f07a93de38af007895d7d263) )
    361. 

  361. 	ROM_LOAD( "8514.a1", 0x1800, 0x0800, CRC(ad218690) SHA1(08ba5f4fa4c75d8dad1a7162888d44b3349cbbe4) )
    362. 

  362. 	ROM_RELOAD(          0xF800, 0x0800 )
    363. 

  363. 

  364. 	ROM_REGION( 0x800, REGION_GFX1, ROMREGION_DISPOSE )   /* 2 color tiles */
    365. 

  365. 	ROM_LOAD( "8519dr.j0", 0x000, 0x200, CRC(aa221ba0) SHA1(450acbf349d77a790a25f3e303c31b38cc426a38) )
    366. 

  366. 	ROM_LOAD( "8521dr.k0", 0x200, 0x200, CRC(0cb33f12) SHA1(d50cb55391aec03e064eecad1624d50d4c30ccab) )
    367. 

  367. 	ROM_LOAD( "8520dr.r0", 0x400, 0x200, CRC(ee1ae6a7) SHA1(83491095260c8b7c616ff17ec1e888d05620f166) )
    368. 

  368. 

  369. 	ROM_REGION( 0x800, REGION_GFX2, ROMREGION_DISPOSE )   /* 4 color tiles */
    370. 

  370. 	ROM_LOAD( "8515dr.e0", 0x000, 0x200, CRC(9510a59e) SHA1(aea0782b919279efe55a07007bd55a16f7f59239) )
    371. 

  371. 	ROM_LOAD( "8517dr.h0", 0x200, 0x200, CRC(8b5bff1f) SHA1(fdcd719c66bff7c4b9f3d56d1e635259dd8add61) )
    372. 

  372. 	ROM_LOAD( "8516dr.l0", 0x400, 0x200, CRC(d1e74af1) SHA1(f55a3bfd7d152ac9af128697f55c9a0c417779f5) )
    373. 

  373. 	ROM_LOAD( "8518dr.n0", 0x600, 0x200, CRC(b1369028) SHA1(598a8779982d532c9f34345e793a79fcb29cac62) )
    374. 

  374. ROM_END
    375. 

  375. 

  376. 

  377. GAME( 1977, dragrace, 0, dragrace, dragrace, 0, 0, "Atari", "Drag Race", 0 )
    378. 

  378.