1 #include "../vidhrdw/centiped.c"
2
3 /***************************************************************************
4
5 Main clock: XTAL = 12.096 MHz
6 6502 Clock: XTAL/8 = 1.512 MHz (0.756 when accessing playfield RAM)
7 Horizontal video frequency: HSYNC = XTAL/256/3 = 15.75 kHz
8 Video frequency: VSYNC = HSYNC/263 ?? = 59.88593 Hz (not sure, could be /262)
9 VBlank duration: 1/VSYNC * (23/263) = 1460 us
10
11
12 Centipede Memory map and Dip Switches
13 -------------------------------------
14
15 Memory map for Centipede directly from the Atari schematics (1981).
16
17 Address R/W D7 D6 D5 D4 D3 D2 D1 D0 Function
18 --------------------------------------------------------------------------------------
19 0000-03FF D D D D D D D D RAM
20 --------------------------------------------------------------------------------------
21 0400-07BF D D D D D D D D Playfield RAM
22 07C0-07CF D D D D D D D D Motion Object Picture
23 07D0-07DF D D D D D D D D Motion Object Vert.
24 07E0-07EF D D D D D D D D Motion Object Horiz.
25 07F0-07FF D D D D D D Motion Object Color
26 --------------------------------------------------------------------------------------
27 0800 R D D D D D D D D Option Switch 1 (0 = On)
28 0801 R D D D D D D D D Option Switch 2 (0 = On)
29 --------------------------------------------------------------------------------------
30 0C00 R D D D D D Horizontal Mini-Track Ball tm Inputs
31 R D VBLANK (1 = VBlank)
32 R D Self-Test (0 = On)
33 R D Cocktail Cabinet (1 = Cocktail)
34 0C01 R D D D R,C,L Coin Switches (0 = On)
35 R D SLAM (0 = On)
36 R D Player 2 Fire Switch (0 = On)
37 R D Player 1 Fire Switch (0 = On)
38 R D Player 2 Start Switch (0 = On)
39 R D Player 1 Start Switch (0 = On)
40
41 0C02 R D D D D D Vertical Mini-Track Ball tm Inputs
42 0C03 R D D D D Player 1 Joystick (R,L,Down,Up)
43 R D D D D Player 2 Joystick (0 = On)
44 --------------------------------------------------------------------------------------
45 1000-100F R/W D D D D D D D D Custom Audio Chip
46 1404 W D D D D Playfield Color RAM
47 140C W D D D D Motion Object Color RAM
48 --------------------------------------------------------------------------------------
49 1600 W D D D D D D D D EA ROM Address & Data Latch
50 1680 W D D D D EA ROM Control Latch
51 1700 R D D D D D D D D EA ROM Read Data
52 --------------------------------------------------------------------------------------
53 1800 W IRQ Acknowledge
54 --------------------------------------------------------------------------------------
55 1C00 W D Left Coin Counter (1 = On)
56 1C01 W D Center Coin Counter (1 = On)
57 1C02 W D Right Coin Counter (1 = On)
58 1C03 W D Player 1 Start LED (0 = On)
59 1C04 W D Player 2 Start LED (0 = On)
60 1C07 W D Track Ball Flip Control (0 = Player 1)
61 --------------------------------------------------------------------------------------
62 2000 W WATCHDOG
63 2400 W Clear Mini-Track Ball Counters
64 --------------------------------------------------------------------------------------
65 2000-3FFF R Program ROM
66 --------------------------------------------------------------------------------------
67
68 -EA ROM is an Erasable Reprogrammable rom to save the top 3 high scores
69 and other stuff.
70
71
72 Dip switches at N9 on the PCB
73
74 8 7 6 5 4 3 2 1 Option
75 -------------------------------------------------------------------------------------
76 On On English $
77 On Off German
78 Off On French
79 Off Off Spanish
80 -------------------------------------------------------------------------------------
81 On On 2 lives per game
82 On Off 3 lives per game $
83 Off On 4 lives per game
84 Off Off 5 lives per game
85 -------------------------------------------------------------------------------------
86 Bonus life granted at every:
87 On On 10,000 points
88 On Off 12.000 points $
89 Off On 15,000 points
90 Off Off 20,000 points
91 -------------------------------------------------------------------------------------
92 On Hard game difficulty
93 Off Easy game difficulty $
94 -------------------------------------------------------------------------------------
95 On 1-credit minimum $
96 Off 2-credit minimum
97 -------------------------------------------------------------------------------------
98
99 $ = Manufacturer's suggested settings
100
101
102 Dip switches at N8 on the PCB
103
104 8 7 6 5 4 3 2 1 Option
105 -------------------------------------------------------------------------------------
106 On On Free play
107 On Off 1 coin for 2 credits
108 Off On 1 coin for 1 credit $
109 Off Off 2 coins for 1 credit
110 -------------------------------------------------------------------------------------
111 On On Right coin mech X 1 $
112 On Off Right coin mech X 4
113 Off On Right coin mech X 5
114 Off Off Right coin mech X 6
115 -------------------------------------------------------------------------------------
116 On Left coin mech X 1 $
117 Off Left coin mech X 2
118 -------------------------------------------------------------------------------------
119 On On On No bonus coins $
120 On On Off For every 2 coins inserted, game logic
121 adds 1 more coin
122 On Off On For every 4 coins inserted, game logic
123 adds 1 more coin
124 On Off Off For every 4 coins inserted, game logic
125 adds 2 more coin
126 Off On On For every 5 coins inserted, game logic
127 adds 1 more coin
128 Off On Off For every 3 coins inserted, game logic
129 adds 1 more coin
130 -------------------------------------------------------------------------------------
131 $ = Manufacturer's suggested settings
132
133 Changes:
134 30 Apr 98 LBO
135 * Fixed test mode
136 * Changed high score to use earom routines
137 * Added support for alternate rom set
138
139 Known issues:
140
141 * Are coins supposed to take over a second to register?
142 * Need to confirm CPU and Pokey clocks
143
144 ***************************************************************************/
145
146 #include "driver.h"
147 #include "vidhrdw/generic.h"
148 #include "machine/atari_vg.h"
149
150
151 WRITE_HANDLER( centiped_paletteram_w );
152 void centiped_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
153
154 void centiped_init_machine(void); /* in vidhrdw */
155 int centiped_interrupt(void); /* in vidhrdw */
156
157
158 /*
159 * This wrapper routine is necessary because Centipede requires a direction bit
160 * to be set or cleared. The direction bit is held until the mouse is moved
161 * again.
162 *
163 * There is a 4-bit counter, and two inputs from the trackball: DIR and CLOCK.
164 * CLOCK makes the counter move in the direction of DIR. Since DIR is latched
165 * only when a CLOCK arrives, the DIR bit in the input port doesn't change
166 * until the trackball actually moves.
167 *
168 * There is also a CLR input to the counter which could be used by the game to
169 * clear the counter, but Centipede doesn't use it (though it would be a good
170 * idea to support it anyway).
171 *
172 * The counter is read 240 times per second. There is no provision whatsoever
173 * to prevent the counter from wrapping around between reads.
174 */
READ_HANDLER(centiped_IN0_r)175 static READ_HANDLER( centiped_IN0_r )
176 {
177 static int oldpos,sign;
178 int newpos;
179
180 newpos = readinputport(6);
181 if (newpos != oldpos)
182 {
183 sign = (newpos - oldpos) & 0x80;
184 oldpos = newpos;
185 }
186
187 return ((readinputport(0) & 0x70) | (oldpos & 0x0f) | sign );
188 }
189
READ_HANDLER(centiped_IN2_r)190 static READ_HANDLER( centiped_IN2_r )
191 {
192 static int oldpos,sign;
193 int newpos;
194
195 newpos = readinputport(2);
196 if (newpos != oldpos)
197 {
198 sign = (newpos - oldpos) & 0x80;
199 oldpos = newpos;
200 }
201
202 return ((oldpos & 0x0f) | sign );
203 }
204
205
WRITE_HANDLER(centiped_led_w)206 static WRITE_HANDLER( centiped_led_w )
207 {
208 osd_led_w(offset,~data >> 7);
209 }
210
READ_HANDLER(centipdb_rand_r)211 static READ_HANDLER( centipdb_rand_r )
212 {
213 return rand() % 0xff;
214 }
215
WRITE_HANDLER(centipdb_AY8910_w)216 static WRITE_HANDLER( centipdb_AY8910_w )
217 {
218 AY8910_control_port_0_w(0, offset);
219 AY8910_write_port_0_w(0, data);
220 }
221
READ_HANDLER(centipdb_AY8910_r)222 static READ_HANDLER( centipdb_AY8910_r )
223 {
224 AY8910_control_port_0_w(0, offset);
225 return AY8910_read_port_0_r(0);
226 }
227
228 static struct MemoryReadAddress centiped_readmem[] =
229 {
230 { 0x0000, 0x03ff, MRA_RAM },
231 { 0x0400, 0x07ff, MRA_RAM },
232 { 0x0800, 0x0800, input_port_4_r }, /* DSW1 */
233 { 0x0801, 0x0801, input_port_5_r }, /* DSW2 */
234 { 0x0c00, 0x0c00, centiped_IN0_r }, /* IN0 */
235 { 0x0c01, 0x0c01, input_port_1_r }, /* IN1 */
236 { 0x0c02, 0x0c02, centiped_IN2_r }, /* IN2 */ /* JB 971220 */
237 { 0x0c03, 0x0c03, input_port_3_r }, /* IN3 */
238 { 0x1000, 0x100f, pokey1_r },
239 { 0x1700, 0x173f, atari_vg_earom_r },
240 { 0x2000, 0x3fff, MRA_ROM },
241 { 0xf800, 0xffff, MRA_ROM }, /* for the reset / interrupt vectors */
242 { -1 } /* end of table */
243 };
244
245 /* Same as the regular one, except it uses an AY8910 and an external RNG */
246 static struct MemoryReadAddress centipdb_readmem[] =
247 {
248 { 0x0000, 0x03ff, MRA_RAM },
249 { 0x0400, 0x07ff, MRA_RAM },
250 { 0x0800, 0x0800, input_port_4_r }, /* DSW1 */
251 { 0x0801, 0x0801, input_port_5_r }, /* DSW2 */
252 { 0x0c00, 0x0c00, centiped_IN0_r }, /* IN0 */
253 { 0x0c01, 0x0c01, input_port_1_r }, /* IN1 */
254 { 0x0c02, 0x0c02, centiped_IN2_r }, /* IN2 */ /* JB 971220 */
255 { 0x0c03, 0x0c03, input_port_3_r }, /* IN3 */
256 { 0x1000, 0x100f, centipdb_AY8910_r },
257 { 0x1700, 0x173f, atari_vg_earom_r },
258 { 0x1780, 0x1780, centipdb_rand_r },
259 { 0x2000, 0x3fff, MRA_ROM },
260 { 0xf800, 0xffff, MRA_ROM }, /* for the reset / interrupt vectors */
261 { -1 } /* end of table */
262 };
263
264 static struct MemoryReadAddress centipb2_readmem[] =
265 {
266 { 0x0000, 0x03ff, MRA_RAM },
267 { 0x0400, 0x07ff, MRA_RAM },
268 { 0x0800, 0x0800, input_port_4_r }, /* DSW1 */
269 { 0x0801, 0x0801, input_port_5_r }, /* DSW2 */
270 { 0x0c00, 0x0c00, centiped_IN0_r }, /* IN0 */
271 { 0x0c01, 0x0c01, input_port_1_r }, /* IN1 */
272 { 0x0c02, 0x0c02, centiped_IN2_r }, /* IN2 */ /* JB 971220 */
273 { 0x0c03, 0x0c03, input_port_3_r }, /* IN3 */
274 { 0x1001, 0x1001, AY8910_read_port_0_r },
275 { 0x1700, 0x173f, atari_vg_earom_r },
276 { 0x2000, 0x3fff, MRA_ROM },
277 { 0x6000, 0x67ff, MRA_ROM },
278 { 0xf800, 0xffff, MRA_ROM }, /* for the reset / interrupt vectors */
279 { -1 } /* end of table */
280 };
281
282 static struct MemoryWriteAddress centiped_writemem[] =
283 {
284 { 0x0000, 0x03ff, MWA_RAM },
285 { 0x0400, 0x07bf, videoram_w, &videoram, &videoram_size },
286 { 0x07c0, 0x07ff, MWA_RAM, &spriteram },
287 { 0x1000, 0x100f, pokey1_w },
288 { 0x1400, 0x140f, centiped_paletteram_w, &paletteram },
289 { 0x1600, 0x163f, atari_vg_earom_w },
290 { 0x1680, 0x1680, atari_vg_earom_ctrl_w },
291 { 0x1800, 0x1800, MWA_NOP }, /* IRQ acknowldege */
292 { 0x1c00, 0x1c02, coin_counter_w },
293 { 0x1c03, 0x1c04, centiped_led_w },
294 { 0x1c07, 0x1c07, flip_screen_w },
295 { 0x2000, 0x2000, watchdog_reset_w },
296 { 0x2000, 0x3fff, MWA_ROM },
297 { -1 } /* end of table */
298 };
299
300 /* Same as the regular one, except it uses an AY8910 */
301 static struct MemoryWriteAddress centipdb_writemem[] =
302 {
303 { 0x0000, 0x03ff, MWA_RAM },
304 { 0x0400, 0x07bf, videoram_w, &videoram, &videoram_size },
305 { 0x07c0, 0x07ff, MWA_RAM, &spriteram },
306 { 0x1000, 0x100f, centipdb_AY8910_w },
307 { 0x1400, 0x140f, centiped_paletteram_w, &paletteram },
308 { 0x1600, 0x163f, atari_vg_earom_w },
309 { 0x1680, 0x1680, atari_vg_earom_ctrl_w },
310 { 0x1800, 0x1800, MWA_NOP }, /* IRQ acknowldege */
311 { 0x1c00, 0x1c02, coin_counter_w },
312 { 0x1c03, 0x1c04, centiped_led_w },
313 { 0x1c07, 0x1c07, flip_screen_w },
314 { 0x2000, 0x2000, watchdog_reset_w },
315 { 0x2000, 0x3fff, MWA_ROM },
316 { -1 } /* end of table */
317 };
318
319 static struct MemoryWriteAddress centipb2_writemem[] =
320 {
321 { 0x0000, 0x03ff, MWA_RAM },
322 { 0x0400, 0x07bf, videoram_w, &videoram, &videoram_size },
323 { 0x07c0, 0x07ff, MWA_RAM, &spriteram },
324 { 0x1000, 0x1000, AY8910_write_port_0_w },
325 { 0x1001, 0x1001, AY8910_control_port_0_w },
326 { 0x1400, 0x140f, centiped_paletteram_w, &paletteram },
327 { 0x1600, 0x163f, atari_vg_earom_w },
328 { 0x1680, 0x1680, atari_vg_earom_ctrl_w },
329 { 0x1800, 0x1800, MWA_NOP }, /* IRQ acknowldege */
330 { 0x1c00, 0x1c02, coin_counter_w },
331 { 0x1c03, 0x1c04, centiped_led_w },
332 { 0x1c07, 0x1c07, flip_screen_w },
333 { 0x2000, 0x2000, watchdog_reset_w },
334 { 0x2000, 0x3fff, MWA_ROM },
335 { 0x6000, 0x67ff, MWA_ROM },
336 { -1 } /* end of table */
337 };
338
339
340 /* The input ports are identical for the real one and the bootleg one, except
341 that one of the languages is Italian in the bootleg one instead of Spanish */
342
343 #define PORTS(GAMENAME, FOURTH_LANGUAGE) \
344 \
345 INPUT_PORTS_START( GAMENAME ) \
346 PORT_START /* IN0 */ \
347 /* The lower 4 bits and bit 7 are for trackball x input. */ \
348 /* They are handled by fake input port 6 and a custom routine. */ \
349 PORT_BIT ( 0x0f, IP_ACTIVE_HIGH, IPT_UNKNOWN ) \
350 PORT_DIPNAME(0x10, 0x00, DEF_STR( Cabinet ) ) \
351 PORT_DIPSETTING ( 0x00, DEF_STR( Upright ) ) \
352 PORT_DIPSETTING ( 0x10, DEF_STR( Cocktail ) ) \
353 PORT_SERVICE( 0x20, IP_ACTIVE_LOW ) \
354 PORT_BIT ( 0x40, IP_ACTIVE_HIGH, IPT_VBLANK ) \
355 PORT_BIT ( 0x80, IP_ACTIVE_HIGH, IPT_UNKNOWN ) \
356 \
357 PORT_START /* IN1 */ \
358 PORT_BIT ( 0x01, IP_ACTIVE_LOW, IPT_START1 ) \
359 PORT_BIT ( 0x02, IP_ACTIVE_LOW, IPT_START2 ) \
360 PORT_BIT ( 0x04, IP_ACTIVE_LOW, IPT_BUTTON1 ) \
361 PORT_BIT ( 0x08, IP_ACTIVE_LOW, IPT_BUTTON1 | IPF_PLAYER2 ) \
362 PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_TILT ) \
363 PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_COIN1 ) \
364 PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_COIN2 ) \
365 PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_COIN3 ) \
366 \
367 PORT_START /* IN2 */ \
368 PORT_ANALOGX( 0xff, 0x00, IPT_TRACKBALL_Y, 50, 10, 0, 0, IP_KEY_NONE, IP_KEY_NONE, IP_JOY_NONE, IP_JOY_NONE ) \
369 /* The lower 4 bits are the input, and bit 7 is the direction. */ \
370 /* The state of bit 7 does not change if the trackball is not moved.*/ \
371 \
372 PORT_START /* IN3 */ \
373 PORT_BIT ( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN | IPF_8WAY | IPF_COCKTAIL ) \
374 PORT_BIT ( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_UP | IPF_8WAY | IPF_COCKTAIL ) \
375 PORT_BIT ( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_8WAY | IPF_COCKTAIL ) \
376 PORT_BIT ( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_8WAY | IPF_COCKTAIL ) \
377 PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_UP | IPF_8WAY ) \
378 PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN | IPF_8WAY ) \
379 PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT | IPF_8WAY ) \
380 PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT | IPF_8WAY ) \
381 \
382 PORT_START /* IN4 */ \
383 PORT_DIPNAME(0x03, 0x00, "Language" ) \
384 PORT_DIPSETTING ( 0x00, "English" ) \
385 PORT_DIPSETTING ( 0x01, "German" ) \
386 PORT_DIPSETTING ( 0x02, "French" ) \
387 PORT_DIPSETTING ( 0x03, FOURTH_LANGUAGE ) \
388 PORT_DIPNAME(0x0c, 0x04, DEF_STR( Lives ) ) \
389 PORT_DIPSETTING ( 0x00, "2" ) \
390 PORT_DIPSETTING ( 0x04, "3" ) \
391 PORT_DIPSETTING ( 0x08, "4" ) \
392 PORT_DIPSETTING ( 0x0c, "5" ) \
393 PORT_DIPNAME(0x30, 0x10, DEF_STR( Bonus_Life ) ) \
394 PORT_DIPSETTING ( 0x00, "10000" ) \
395 PORT_DIPSETTING ( 0x10, "12000" ) \
396 PORT_DIPSETTING ( 0x20, "15000" ) \
397 PORT_DIPSETTING ( 0x30, "20000" ) \
398 PORT_DIPNAME(0x40, 0x40, DEF_STR( Difficulty ) ) \
399 PORT_DIPSETTING ( 0x40, "Easy" ) \
400 PORT_DIPSETTING ( 0x00, "Hard" ) \
401 PORT_DIPNAME(0x80, 0x00, "Credit Minimum" ) \
402 PORT_DIPSETTING ( 0x00, "1" ) \
403 PORT_DIPSETTING ( 0x80, "2" ) \
404 \
405 PORT_START /* IN5 */ \
406 PORT_DIPNAME(0x03, 0x02, DEF_STR( Coinage ) ) \
407 PORT_DIPSETTING ( 0x03, DEF_STR( 2C_1C ) ) \
408 PORT_DIPSETTING ( 0x02, DEF_STR( 1C_1C ) ) \
409 PORT_DIPSETTING ( 0x01, DEF_STR( 1C_2C ) ) \
410 PORT_DIPSETTING ( 0x00, DEF_STR( Free_Play ) ) \
411 PORT_DIPNAME(0x0c, 0x00, "Right Coin" ) \
412 PORT_DIPSETTING ( 0x00, "*1" ) \
413 PORT_DIPSETTING ( 0x04, "*4" ) \
414 PORT_DIPSETTING ( 0x08, "*5" ) \
415 PORT_DIPSETTING ( 0x0c, "*6" ) \
416 PORT_DIPNAME(0x10, 0x00, "Left Coin" ) \
417 PORT_DIPSETTING ( 0x00, "*1" ) \
418 PORT_DIPSETTING ( 0x10, "*2" ) \
419 PORT_DIPNAME(0xe0, 0x00, "Bonus Coins" ) \
420 PORT_DIPSETTING ( 0x00, "None" ) \
421 PORT_DIPSETTING ( 0x20, "3 credits/2 coins" ) \
422 PORT_DIPSETTING ( 0x40, "5 credits/4 coins" ) \
423 PORT_DIPSETTING ( 0x60, "6 credits/4 coins" ) \
424 PORT_DIPSETTING ( 0x80, "6 credits/5 coins" ) \
425 PORT_DIPSETTING ( 0xa0, "4 credits/3 coins" ) \
426 \
427 PORT_START /* IN6, fake trackball input port. */ \
428 PORT_ANALOGX( 0xff, 0x00, IPT_TRACKBALL_X | IPF_REVERSE, 50, 10, 0, 0, IP_KEY_NONE, IP_KEY_NONE, IP_JOY_NONE, IP_JOY_NONE ) \
429 INPUT_PORTS_END
430
431 PORTS(centiped, "Spanish")
432 PORTS(centipdb, "Italian")
433
434
435 static struct GfxLayout charlayout =
436 {
437 8,8, /* 8*8 characters */
438 256, /* 256 characters */
439 2, /* 2 bits per pixel */
440 { 256*8*8, 0 }, /* the two bitplanes are separated */
441 { 0, 1, 2, 3, 4, 5, 6, 7 },
442 { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
443 8*8 /* every char takes 8 consecutive bytes */
444 };
445 static struct GfxLayout spritelayout =
446 {
447 8,16, /* 16*8 sprites */
448 128, /* 64 sprites */
449 2, /* 2 bits per pixel */
450 { 128*16*8, 0 }, /* the two bitplanes are separated */
451 { 0, 1, 2, 3, 4, 5, 6, 7 },
452 { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8,
453 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
454 16*8 /* every sprite takes 16 consecutive bytes */
455 };
456
457
458
459 static struct GfxDecodeInfo gfxdecodeinfo[] =
460 {
461 { REGION_GFX1, 0, &charlayout, 4, 4 }, /* 4 color codes to support midframe */
462 /* palette changes in test mode */
463 { REGION_GFX1, 0, &spritelayout, 0, 1 },
464 { -1 } /* end of array */
465 };
466
467
468
469 static struct POKEYinterface pokey_interface =
470 {
471 1, /* 1 chip */
472 12096000/8, /* 1.512 MHz */
473 { 100 },
474 /* The 8 pot handlers */
475 { 0 },
476 { 0 },
477 { 0 },
478 { 0 },
479 { 0 },
480 { 0 },
481 { 0 },
482 { 0 },
483 /* The allpot handler */
484 { 0 },
485 };
486
487 static struct AY8910interface centipdb_ay8910_interface =
488 {
489 1, /* 1 chips */
490 12096000/8, /* 1.512 MHz */
491 { 50 },
492 { 0 },
493 { 0 },
494 { 0 },
495 { 0 }
496 };
497
498 static struct AY8910interface centipb2_ay8910_interface =
499 {
500 1, /* 1 chips */
501 12096000/8, /* 1.512 MHz */
502 { 50 },
503 { centipdb_rand_r },
504 { 0 },
505 { 0 },
506 { 0 }
507 };
508
509
510 #define DRIVER(GAMENAME, SOUND_TYPE, SOUND_INTERFACE) \
511 \
512 static struct MachineDriver machine_driver_##GAMENAME = \
513 { \
514 /* basic machine hardware */ \
515 { \
516 { \
517 CPU_M6502, \
518 12096000/8, /* 1.512 Mhz (slows down to 0.75MHz while accessing playfield RAM) */ \
519 GAMENAME##_readmem,GAMENAME##_writemem,0,0, \
520 centiped_interrupt,4 \
521 } \
522 }, \
523 60, 1460, /* frames per second, vblank duration */ \
524 1, /* single CPU, no need for interleaving */ \
525 centiped_init_machine, \
526 \
527 /* video hardware */ \
528 32*8, 32*8, { 0*8, 32*8-1, 0*8, 30*8-1 }, \
529 gfxdecodeinfo, \
530 4+4*4, 4+4*4, \
531 0, \
532 \
533 VIDEO_TYPE_RASTER|VIDEO_SUPPORTS_DIRTY|VIDEO_MODIFIES_PALETTE, \
534 0, \
535 generic_vh_start, \
536 generic_vh_stop, \
537 centiped_vh_screenrefresh, \
538 \
539 /* sound hardware */ \
540 0,0,0,0, \
541 { \
542 { \
543 SOUND_TYPE, \
544 SOUND_INTERFACE, \
545 } \
546 }, \
547 \
548 atari_vg_earom_handler \
549 };
550
551
552 DRIVER(centiped, SOUND_POKEY, &pokey_interface)
553
554 /* In the bootlegs the Pokey has been replaced by an AY8910 */
555 DRIVER(centipdb, SOUND_AY8910, ¢ipdb_ay8910_interface)
556 DRIVER(centipb2, SOUND_AY8910, ¢ipb2_ay8910_interface)
557
558
559 /***************************************************************************
560
561 Game driver(s)
562
563 ***************************************************************************/
564
565 ROM_START( centiped )
566 ROM_REGION( 0x10000, REGION_CPU1 ) /* 64k for code */
567 ROM_LOAD( "centiped.307", 0x2000, 0x0800, 0x5ab0d9de )
568 ROM_LOAD( "centiped.308", 0x2800, 0x0800, 0x4c07fd3e )
569 ROM_LOAD( "centiped.309", 0x3000, 0x0800, 0xff69b424 )
570 ROM_LOAD( "centiped.310", 0x3800, 0x0800, 0x44e40fa4 )
571 ROM_RELOAD( 0xf800, 0x0800 ) /* for the reset and interrupt vectors */
572
573 ROM_REGION( 0x1000, REGION_GFX1 | REGIONFLAG_DISPOSE )
574 ROM_LOAD( "centiped.211", 0x0000, 0x0800, 0x880acfb9 )
575 ROM_LOAD( "centiped.212", 0x0800, 0x0800, 0xb1397029 )
576 ROM_END
577
578 ROM_START( centipd2 )
579 ROM_REGION( 0x10000, REGION_CPU1 ) /* 64k for code */
580 ROM_LOAD( "centiped.207", 0x2000, 0x0800, 0xb2909e2f )
581 ROM_LOAD( "centiped.208", 0x2800, 0x0800, 0x110e04ff )
582 ROM_LOAD( "centiped.209", 0x3000, 0x0800, 0xcc2edb26 )
583 ROM_LOAD( "centiped.210", 0x3800, 0x0800, 0x93999153 )
584 ROM_RELOAD( 0xf800, 0x0800 ) /* for the reset and interrupt vectors */
585
586 ROM_REGION( 0x1000, REGION_GFX1 | REGIONFLAG_DISPOSE )
587 ROM_LOAD( "centiped.211", 0x0000, 0x0800, 0x880acfb9 )
588 ROM_LOAD( "centiped.212", 0x0800, 0x0800, 0xb1397029 )
589 ROM_END
590
591 ROM_START( centipdb )
592 ROM_REGION( 0x10000, REGION_CPU1 ) /* 64k for code */
593 ROM_LOAD( "olympia.c28", 0x2000, 0x0800, 0x8a744e57 )
594 ROM_LOAD( "olympia.c29", 0x2800, 0x0800, 0xbb897b10 )
595 ROM_LOAD( "olympia.c30", 0x3000, 0x0800, 0x2297c2ac )
596 ROM_LOAD( "olympia.c31", 0x3800, 0x0800, 0xcc529d6b )
597 ROM_RELOAD( 0xf800, 0x0800 ) /* for the reset and interrupt vectors */
598
599 ROM_REGION( 0x1000, REGION_GFX1 | REGIONFLAG_DISPOSE )
600 ROM_LOAD( "olympia.c32", 0x0000, 0x0800, 0xd91b9724 )
601 ROM_LOAD( "olympia.c33", 0x0800, 0x0800, 0x1a6acd02 )
602 ROM_END
603
604 ROM_START( centipb2 )
605 ROM_REGION( 0x10000, REGION_CPU1 ) /* 64k for code */
606 ROM_LOAD( "d1", 0x2000, 0x0800, 0xb17b8e0b )
607 ROM_LOAD( "e1", 0x2800, 0x0800, 0x7684398e )
608 ROM_LOAD( "h1", 0x3000, 0x0800, 0x74580fe4 )
609 ROM_LOAD( "j1", 0x3800, 0x0800, 0x84600161 )
610 ROM_RELOAD( 0xf800, 0x0800 ) /* for the reset and interrupt vectors */
611 ROM_LOAD( "k1", 0x6000, 0x0800, 0xf1aa329b )
612
613 ROM_REGION( 0x1000, REGION_GFX1 | REGIONFLAG_DISPOSE )
614 ROM_LOAD( "centiped.211", 0x0000, 0x0800, 0x880acfb9 )
615 ROM_LOAD( "centiped.212", 0x0800, 0x0800, 0xb1397029 )
616 ROM_END
617
618
619 GAME( 1980, centiped, 0, centiped, centiped, 0, ROT270, "Atari", "Centipede (revision 3)" )
620 GAME( 1980, centipd2, centiped, centiped, centiped, 0, ROT270, "Atari", "Centipede (revision 2)" )
621 GAME( 1980, centipdb, centiped, centipdb, centipdb, 0, ROT270, "bootleg", "Centipede (bootleg set 1)" )
622 GAME( 1980, centipb2, centiped, centipb2, centiped, 0, ROT270, "bootleg", "Centipede (bootleg set 2)" )
623