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

    Atari Centipede hardware

    Games supported:
        * Centipede (5 sets)
        * Warlords
        * Millipede
        * Bulls Eye Darts

    Known bugs:
        * are coins supposed to take over a second to register?

    Centipede sync-prom added by HIGHWAYMAN.
    The prom pcb location is:P4 and is 256x4
    (i need to update the dump, this one is read in 8bit-mode)

****************************************************************************

    Main clock: XTAL = 12.096 MHz
    6502 Clock: XTAL/8 = 1.512 MHz (0.756 when accessing playfield RAM)
    Horizontal video frequency: HSYNC = XTAL/256/3 = 15.75 kHz
    Video frequency: VSYNC = HSYNC/263 ?? = 59.88593 Hz (not sure, could be /262)
    VBlank duration: 1/VSYNC * (23/263) = 1460 us


                  Centipede Memory map and Dip Switches
                  -------------------------------------

    Memory map for Centipede directly from the Atari schematics (1981).

     Address  R/W  D7 D6 D5 D4 D3 D2 D1 D0   Function
    --------------------------------------------------------------------------------------
    0000-03FF       D  D  D  D  D  D  D  D   RAM
    --------------------------------------------------------------------------------------
    0400-07BF       D  D  D  D  D  D  D  D   Playfield RAM
    07C0-07CF       D  D  D  D  D  D  D  D   Motion Object Picture
    07D0-07DF       D  D  D  D  D  D  D  D   Motion Object Vert.
    07E0-07EF       D  D  D  D  D  D  D  D   Motion Object Horiz.
    07F0-07FF             D  D  D  D  D  D   Motion Object Color
    --------------------------------------------------------------------------------------
    0800       R    D  D  D  D  D  D  D  D   Option Switch 1 (0 = On)
    0801       R    D  D  D  D  D  D  D  D   Option Switch 2 (0 = On)
    --------------------------------------------------------------------------------------
    0C00       R    D           D  D  D  D   Horizontal Mini-Track Ball tm Inputs
               R       D                     VBLANK  (1 = VBlank)
               R          D                  Self-Test  (0 = On)
               R             D               Cocktail Cabinet  (1 = Cocktail)
    0C01       R    D  D  D                  R,C,L Coin Switches (0 = On)
               R             D               SLAM  (0 = On)
               R                D            Player 2 Fire Switch (0 = On)
               R                   D         Player 1 Fire Switch (0 = On)
               R                      D      Player 2 Start Switch (0 = On)
               R                         D   Player 1 Start Switch (0 = On)

    0C02       R    D           D  D  D  D   Vertical Mini-Track Ball tm Inputs
    0C03       R    D  D  D  D               Player 1 Joystick (R,L,Down,Up)
               R                D  D  D  D   Player 2 Joystick   (0 = On)
    --------------------------------------------------------------------------------------
    1000-100F R/W   D  D  D  D  D  D  D  D   Custom Audio Chip
    1404       W                D  D  D  D   Playfield Color RAM
    140C       W                D  D  D  D   Motion Object Color RAM
    --------------------------------------------------------------------------------------
    1600       W    D  D  D  D  D  D  D  D   EA ROM Address & Data Latch
    1680       W                D  D  D  D   EA ROM Control Latch
    1700       R    D  D  D  D  D  D  D  D   EA ROM Read Data
    --------------------------------------------------------------------------------------
    1800       W                             IRQ Acknowledge
    --------------------------------------------------------------------------------------
    1C00       W    D                        Left Coin Counter (1 = On)
    1C01       W    D                        Center Coin Counter (1 = On)
    1C02       W    D                        Right Coin Counter (1 = On)
    1C03       W    D                        Player 1 Start LED (0 = On)
    1C04       W    D                        Player 2 Start LED (0 = On)
    1C07       W    D                        Track Ball Flip Control (0 = Player 1)
    --------------------------------------------------------------------------------------
    2000       W                             WATCHDOG
    2400       W                             Clear Mini-Track Ball Counters
    --------------------------------------------------------------------------------------
    2000-3FFF  R                             Program ROM
    --------------------------------------------------------------------------------------

    -EA ROM is an Erasable Reprogrammable rom to save the top 3 high scores
      and other stuff.


     Dip switches at N9 on the PCB

     8    7    6    5    4    3    2    1    Option
    -------------------------------------------------------------------------------------
                                  On   On    English $
                                  On   Off   German
                                  Off  On    French
                                  Off  Off   Spanish
    -------------------------------------------------------------------------------------
                        On   On              2 lives per game
                        On   Off             3 lives per game $
                        Off  On              4 lives per game
                        Off  Off             5 lives per game
    -------------------------------------------------------------------------------------
                                             Bonus life granted at every:
              On   On                        10,000 points
              On   Off                       12.000 points $
              Off  On                        15,000 points
              Off  Off                       20,000 points
    -------------------------------------------------------------------------------------
         On                                  Hard game difficulty
         Off                                 Easy game difficulty $
    -------------------------------------------------------------------------------------
    On                                       1-credit minimum $
    Off                                      2-credit minimum
    -------------------------------------------------------------------------------------

    $ = Manufacturer's suggested settings


     Dip switches at N8 on the PCB

     8    7    6    5    4    3    2    1    Option
    -------------------------------------------------------------------------------------
                                  On   On    Free play
                                  On   Off   1 coin for 2 credits
                                  Off  On    1 coin for 1 credit $
                                  Off  Off   2 coins for 1 credit
    -------------------------------------------------------------------------------------
                        On   On              Right coin mech X 1 $
                        On   Off             Right coin mech X 4
                        Off  On              Right coin mech X 5
                        Off  Off             Right coin mech X 6
    -------------------------------------------------------------------------------------
                   On                        Left coin mech X 1 $
                   Off                       Left coin mech X 2
    -------------------------------------------------------------------------------------
    On   On   On                             No bonus coins $
    On   On   Off                            For every 2 coins inserted, game logic
                                              adds 1 more coin
    On   Off  On                             For every 4 coins inserted, game logic
                                              adds 1 more coin
    On   Off  Off                            For every 4 coins inserted, game logic
                                              adds 2 more coin
    Off  On   On                             For every 5 coins inserted, game logic
                                              adds 1 more coin
    Off  On   Off                            For every 3 coins inserted, game logic
                                              adds 1 more coin
    -------------------------------------------------------------------------------------
    $ = Manufacturer's suggested settings

    Changes:
        30 Apr 98 LBO
        * Fixed test mode
        * Changed high score to use earom routines
        * Added support for alternate rom set

****************************************************************************

    Millipede memory map (preliminary)

    driver by Ivan Mackintosh

    0400-040F       POKEY 1
    0800-080F       POKEY 2
    1000-13BF       SCREEN RAM (8x8 TILES, 32x30 SCREEN)
    13C0-13CF       SPRITE IMAGE OFFSETS
    13D0-13DF       SPRITE HORIZONTAL OFFSETS
    13E0-13EF       SPRITE VERTICAL OFFSETS
    13F0-13FF       SPRITE COLOR OFFSETS

    2000            BIT 1-4 trackball
                    BIT 5 IS P1 FIRE
                    BIT 6 IS P1 START
                    BIT 7 IS VBLANK

    2001            BIT 1-4 trackball
                    BIT 5 IS P2 FIRE
                    BIT 6 IS P2 START
                    BIT 7,8 (?)

    2010            BIT 1 IS P1 RIGHT
                    BIT 2 IS P1 LEFT
                    BIT 3 IS P1 DOWN
                    BIT 4 IS P1 UP
                    BIT 5 IS SLAM, LEFT COIN, AND UTIL COIN
                    BIT 6,7 (?)
                    BIT 8 IS RIGHT COIN
    2030            earom read
    2480-249F       COLOR RAM
    2500-2502       Coin counters
    2503-2504       LEDs
    2505-2507       Coin door lights ??
    2600            INTERRUPT ACKNOWLEDGE
    2680            CLEAR WATCHDOG
    2700            earom control
    2780            earom write
    4000-7FFF       GAME CODE

****************************************************************************

                  Warlords Memory map and Dip Switches
                  ------------------------------------

     Address  R/W  D7 D6 D5 D4 D3 D2 D1 D0   Function
    --------------------------------------------------------------------------------------
    0000-03FF       D  D  D  D  D  D  D  D   RAM
    --------------------------------------------------------------------------------------
    0400-07BF       D  D  D  D  D  D  D  D   Screen RAM (8x8 TILES, 32x32 SCREEN)
    07C0-07CF       D  D  D  D  D  D  D  D   Motion Object Picture
    07D0-07DF       D  D  D  D  D  D  D  D   Motion Object Vert.
    07E0-07EF       D  D  D  D  D  D  D  D   Motion Object Horiz.
    --------------------------------------------------------------------------------------
    0800       R    D  D  D  D  D  D  D  D   Option Switch 1 (0 = On) (DSW 1)
    0801       R    D  D  D  D  D  D  D  D   Option Switch 2 (0 = On) (DSW 2)
    --------------------------------------------------------------------------------------
    0C00       R    D                        Cocktail Cabinet  (0 = Cocktail)
               R       D                     VBLANK  (1 = VBlank)
               R          D                  SELF TEST
               R             D               DIAG STEP (Unused)
    0C01       R    D  D  D                  R,C,L Coin Switches (0 = On)
               R             D               Slam (0 = On)
               R                D            Player 4 Start Switch (0 = On)
               R                   D         Player 3 Start Switch (0 = On)
               R                      D      Player 2 Start Switch (0 = On)
               R                         D   Player 1 Start Switch (0 = On)
    --------------------------------------------------------------------------------------
    1000-100F  W   D  D  D  D  D  D  D  D    Pokey
    --------------------------------------------------------------------------------------
    1800       W                             IRQ Acknowledge
    --------------------------------------------------------------------------------------
    1C00-1C02  W    D  D  D  D  D  D  D  D   Coin Counters
    --------------------------------------------------------------------------------------
    1C03-1C06  W    D  D  D  D  D  D  D  D   LEDs
    --------------------------------------------------------------------------------------
    4000       W                             Watchdog
    --------------------------------------------------------------------------------------
    5000-7FFF  R                             Program ROM
    --------------------------------------------------------------------------------------

    Game Option Settings - J2 (DSW1)
    =========================

    8   7   6   5   4   3   2   1       Option
    ------------------------------------------
                            On  On      English
                            On  Off     French
                            Off On      Spanish
                            Off Off     German
                        On              Music at end of each game
                        Off             Music at end of game for new highscore
            On  On                      1 or 2 player game costs 1 credit
            On  Off                     1 player game=1 credit, 2 player=2 credits
            Off Off                     1 or 2 player game costs 2 credits
            Off On                      Not used
    -------------------------------------------


    Game Price Settings - M2 (DSW2)
    ========================

    8   7   6   5   4   3   2   1       Option
    ------------------------------------------
                            On  On      Free play
                            On  Off     1 coin for 2 credits
                            Off On      1 coin for 1 credit
                            Off Off     2 coins for 1 credit
                    On  On              Right coin mech x 1
                    On  Off             Right coin mech x 4
                    Off On              Right coin mech x 5
                    Off Off             Right coin mech x 6
                On                      Left coin mech x 1
                Off                     Left coin mech x 2
    On  On  On                          No bonus coins
    On  On  Off                         For every 2 coins, add 1 coin
    On  Off On                          For every 4 coins, add 1 coin
    On  Off Off                         For every 4 coins, add 2 coins
    Off On  On                          For every 5 coins, add 1 coin
    ------------------------------------------

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

#include "driver.h"
#include "cpu/s2650/s2650.h"
#include "vidhrdw/generic.h"
#include "machine/atari_vg.h"
#include "centiped.h"
#include "machine/random.h"
#include "sound/ay8910.h"
#include "sound/sn76496.h"
#include "sound/pokey.h"


static int oldpos[4];
static UINT8 sign[4];
static UINT8 dsw_select;
static UINT8 *rambase;


/*************************************
 *
 *  Interrupts
 *
 *************************************/

static void generate_interrupt(int scanline)
{
	/* IRQ is clocked on the rising edge of 16V, equal to the previous 32V */
	if (scanline & 16)
		cpunum_set_input_line(0, 0, ((scanline - 1) & 32) ? ASSERT_LINE : CLEAR_LINE);

	/* call back again after 16 scanlines */
	scanline += 16;
	if (scanline >= 256)
		scanline = 0;
	timer_set(cpu_getscanlinetime(scanline), scanline, generate_interrupt);
}


static MACHINE_INIT( centiped )
{
	timer_set(cpu_getscanlinetime(0), 0, generate_interrupt);
	cpunum_set_input_line(0, 0, CLEAR_LINE);
	dsw_select = 0;
}


static MACHINE_INIT( magworm )
{
	machine_init_centiped();

	/* kludge: clear RAM so that magworm can be reset cleanly */
	memset(rambase, 0, 0x400);
}


static WRITE8_HANDLER( irq_ack_w )
{
	cpunum_set_input_line(0, 0, CLEAR_LINE);
}



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

/*
 * This wrapper routine is necessary because Centipede requires a direction bit
 * to be set or cleared. The direction bit is held until the mouse is moved
 * again.
 *
 * There is a 4-bit counter, and two inputs from the trackball: DIR and CLOCK.
 * CLOCK makes the counter move in the direction of DIR. Since DIR is latched
 * only when a CLOCK arrives, the DIR bit in the input port doesn't change
 * until the trackball actually moves.
 *
 * There is also a CLR input to the counter which could be used by the game to
 * clear the counter, but Centipede doesn't use it (though it would be a good
 * idea to support it anyway).
 *
 * The counter is read 240 times per second. There is no provision whatsoever
 * to prevent the counter from wrapping around between reads.
 */

INLINE int read_trackball(int idx, int switch_port)
{
	int newpos;

	/* adjust idx if we're cocktail flipped */
	if (centiped_flipscreen)
		idx += 2;

	/* if we're to read the dipswitches behind the trackball data, do it now */
	if (dsw_select)
		return (readinputport(switch_port) & 0x7f) | sign[idx];

	/* get the new position and adjust the result */
	newpos = readinputport(6 + idx);
	if (newpos != oldpos[idx])
	{
		sign[idx] = (newpos - oldpos[idx]) & 0x80;
		oldpos[idx] = newpos;
	}

	/* blend with the bits from the switch port */
	return (readinputport(switch_port) & 0x70) | (oldpos[idx] & 0x0f) | sign[idx];
}


static READ8_HANDLER( centiped_IN0_r )
{
	return read_trackball(0, 0);
}


static READ8_HANDLER( centiped_IN2_r )
{
	return read_trackball(1, 2);
}


static READ8_HANDLER( milliped_IN1_r )
{
	return read_trackball(1, 1);
}


static WRITE8_HANDLER( input_select_w )
{
	dsw_select = (~data >> 7) & 1;
}


static READ8_HANDLER( bullsdrt_data_port_r )
{
	switch (activecpu_get_pc())
	{
		case 0x0033:
		case 0x6b19:
			return 0x01;
	}

	return 0;
}



/*************************************
 *
 *  Output ports
 *
 *************************************/

static WRITE8_HANDLER( led_w )
{
	set_led_status(offset, ~data & 0x80);
}


static READ8_HANDLER( caterplr_rand_r )
{
	return mame_rand() % 0xff;
}


static WRITE8_HANDLER( coin_count_w )
{
	coin_counter_w(offset, data);
}


static WRITE8_HANDLER( bullsdrt_coin_count_w )
{
	coin_counter_w(0, data);
}



/*************************************
 *
 *  Bootleg sound
 *
 *************************************/

static WRITE8_HANDLER( caterplr_AY8910_w )
{
	AY8910_control_port_0_w(0, offset);
	AY8910_write_port_0_w(0, data);
}


static READ8_HANDLER( caterplr_AY8910_r )
{
	AY8910_control_port_0_w(0, offset);
	return AY8910_read_port_0_r(0);
}



/*************************************
 *
 *  Centipede CPU memory handlers
 *
 *************************************/

static ADDRESS_MAP_START( centiped_map, ADDRESS_SPACE_PROGRAM, 8 )
	ADDRESS_MAP_FLAGS( AMEF_ABITS(14) )
	AM_RANGE(0x0000, 0x03ff) AM_RAM AM_BASE(&rambase)
	AM_RANGE(0x0400, 0x07bf) AM_READWRITE(MRA8_RAM, centiped_videoram_w) AM_BASE(&videoram)
	AM_RANGE(0x07c0, 0x07ff) AM_RAM AM_BASE(&spriteram)
	AM_RANGE(0x0800, 0x0800) AM_READ(input_port_4_r)	/* DSW1 */
	AM_RANGE(0x0801, 0x0801) AM_READ(input_port_5_r)	/* DSW2 */
	AM_RANGE(0x0c00, 0x0c00) AM_READ(centiped_IN0_r)	/* IN0 */
	AM_RANGE(0x0c01, 0x0c01) AM_READ(input_port_1_r)	/* IN1 */
	AM_RANGE(0x0c02, 0x0c02) AM_READ(centiped_IN2_r)	/* IN2 */
	AM_RANGE(0x0c03, 0x0c03) AM_READ(input_port_3_r)	/* IN3 */
	AM_RANGE(0x1000, 0x100f) AM_READWRITE(pokey1_r, pokey1_w)
	AM_RANGE(0x1400, 0x140f) AM_WRITE(centiped_paletteram_w) AM_BASE(&paletteram)
	AM_RANGE(0x1600, 0x163f) AM_WRITE(atari_vg_earom_w)
	AM_RANGE(0x1680, 0x1680) AM_WRITE(atari_vg_earom_ctrl_w)
	AM_RANGE(0x1700, 0x173f) AM_READ(atari_vg_earom_r)
	AM_RANGE(0x1800, 0x1800) AM_WRITE(irq_ack_w)
	AM_RANGE(0x1c00, 0x1c02) AM_WRITE(coin_count_w)
	AM_RANGE(0x1c03, 0x1c04) AM_WRITE(led_w)
	AM_RANGE(0x1c07, 0x1c07) AM_WRITE(centiped_flip_screen_w)
	AM_RANGE(0x2000, 0x2000) AM_WRITE(watchdog_reset_w)
	AM_RANGE(0x2000, 0x3fff) AM_ROM
ADDRESS_MAP_END


static ADDRESS_MAP_START( centipdb_map, ADDRESS_SPACE_PROGRAM, 8 )
	ADDRESS_MAP_FLAGS( AMEF_ABITS(15) )
	AM_RANGE(0x0000, 0x03ff) AM_MIRROR(0x4000) AM_RAM
	AM_RANGE(0x0400, 0x07bf) AM_MIRROR(0x4000) AM_READWRITE(MRA8_RAM, centiped_videoram_w) AM_BASE(&videoram)
	AM_RANGE(0x07c0, 0x07ff) AM_MIRROR(0x4000) AM_RAM AM_BASE(&spriteram)
	AM_RANGE(0x0800, 0x0800) AM_MIRROR(0x4000) AM_READ(input_port_4_r)	/* DSW1 */
	AM_RANGE(0x0801, 0x0801) AM_MIRROR(0x4000) AM_READ(input_port_5_r)	/* DSW2 */
	AM_RANGE(0x0c00, 0x0c00) AM_MIRROR(0x4000) AM_READ(centiped_IN0_r)	/* IN0 */
	AM_RANGE(0x0c01, 0x0c01) AM_MIRROR(0x4000) AM_READ(input_port_1_r)	/* IN1 */
	AM_RANGE(0x0c02, 0x0c02) AM_MIRROR(0x4000) AM_READ(centiped_IN2_r)	/* IN2 */
	AM_RANGE(0x0c03, 0x0c03) AM_MIRROR(0x4000) AM_READ(input_port_3_r)	/* IN3 */
	AM_RANGE(0x1000, 0x1000) AM_MIRROR(0x4000) AM_WRITE(AY8910_write_port_0_w)
	AM_RANGE(0x1001, 0x1001) AM_MIRROR(0x4000) AM_READWRITE(AY8910_read_port_0_r, AY8910_control_port_0_w)
	AM_RANGE(0x1400, 0x140f) AM_MIRROR(0x4000) AM_WRITE(centiped_paletteram_w) AM_BASE(&paletteram)
	AM_RANGE(0x1600, 0x163f) AM_MIRROR(0x4000) AM_WRITE(atari_vg_earom_w)
	AM_RANGE(0x1680, 0x1680) AM_MIRROR(0x4000) AM_WRITE(atari_vg_earom_ctrl_w)
	AM_RANGE(0x1700, 0x173f) AM_MIRROR(0x4000) AM_READ(atari_vg_earom_r)
	AM_RANGE(0x1800, 0x1800) AM_MIRROR(0x4000) AM_WRITE(irq_ack_w)
	AM_RANGE(0x1c00, 0x1c02) AM_MIRROR(0x4000) AM_WRITE(coin_count_w)
	AM_RANGE(0x1c03, 0x1c04) AM_MIRROR(0x4000) AM_WRITE(led_w)
	AM_RANGE(0x1c07, 0x1c07) AM_MIRROR(0x4000) AM_WRITE(centiped_flip_screen_w)
	AM_RANGE(0x2000, 0x27ff) AM_ROM
	AM_RANGE(0x2800, 0x3fff) AM_MIRROR(0x4000) AM_ROM
	AM_RANGE(0x6000, 0x67ff) AM_ROM
ADDRESS_MAP_END



/*************************************
 *
 *  Millipede CPU memory handlers
 *
 *************************************/

static ADDRESS_MAP_START( milliped_map, ADDRESS_SPACE_PROGRAM, 8 )
	ADDRESS_MAP_FLAGS( AMEF_ABITS(15) )
	AM_RANGE(0x0000, 0x03ff) AM_RAM
	AM_RANGE(0x0400, 0x040f) AM_READWRITE(pokey1_r, pokey1_w)
	AM_RANGE(0x0800, 0x080f) AM_READWRITE(pokey2_r, pokey2_w)
	AM_RANGE(0x1000, 0x13bf) AM_READWRITE(MRA8_RAM, centiped_videoram_w) AM_BASE(&videoram)
	AM_RANGE(0x13c0, 0x13ff) AM_RAM AM_BASE(&spriteram)
	AM_RANGE(0x2000, 0x2000) AM_READ(centiped_IN0_r)
	AM_RANGE(0x2001, 0x2001) AM_READ(milliped_IN1_r)
	AM_RANGE(0x2010, 0x2010) AM_READ(input_port_2_r)
	AM_RANGE(0x2011, 0x2011) AM_READ(input_port_3_r)
	AM_RANGE(0x2030, 0x2030) AM_READ(atari_vg_earom_r)
	AM_RANGE(0x2480, 0x249f) AM_WRITE(milliped_paletteram_w) AM_BASE(&paletteram)
	AM_RANGE(0x2500, 0x2502) AM_WRITE(coin_count_w)
	AM_RANGE(0x2503, 0x2504) AM_WRITE(led_w)
	AM_RANGE(0x2505, 0x2505) AM_WRITE(input_select_w)
/*  AM_RANGE(0x2506, 0x2507) AM_WRITE(MWA8_NOP)    ?    */
	AM_RANGE(0x2600, 0x2600) AM_WRITE(irq_ack_w)
	AM_RANGE(0x2680, 0x2680) AM_WRITE(watchdog_reset_w)
	AM_RANGE(0x2700, 0x2700) AM_WRITE(atari_vg_earom_ctrl_w)
	AM_RANGE(0x2780, 0x27bf) AM_WRITE(atari_vg_earom_w)
	AM_RANGE(0x4000, 0x7fff) AM_ROM
ADDRESS_MAP_END



/*************************************
 *
 *  Warlords CPU memory handlers
 *
 *************************************/

static ADDRESS_MAP_START( warlords_map, ADDRESS_SPACE_PROGRAM, 8 )
	ADDRESS_MAP_FLAGS( AMEF_ABITS(15) )
	AM_RANGE(0x0000, 0x03ff) AM_RAM
	AM_RANGE(0x0400, 0x07bf) AM_READWRITE(MRA8_RAM, centiped_videoram_w) AM_BASE(&videoram)
	AM_RANGE(0x07c0, 0x07ff) AM_RAM AM_BASE(&spriteram)
	AM_RANGE(0x0800, 0x0800) AM_READ(input_port_2_r) /* DSW1 */
	AM_RANGE(0x0801, 0x0801) AM_READ(input_port_3_r) /* DSW2 */
	AM_RANGE(0x0c00, 0x0c00) AM_READ(input_port_0_r) /* IN0 */
	AM_RANGE(0x0c01, 0x0c01) AM_READ(input_port_1_r) /* IN1 */
	AM_RANGE(0x1000, 0x100f) AM_READWRITE(pokey1_r, pokey1_w)
	AM_RANGE(0x1800, 0x1800) AM_WRITE(irq_ack_w)
	AM_RANGE(0x1c00, 0x1c02) AM_WRITE(coin_count_w)
	AM_RANGE(0x1c03, 0x1c06) AM_WRITE(led_w)
	AM_RANGE(0x4000, 0x4000) AM_WRITE(watchdog_reset_w)
	AM_RANGE(0x5000, 0x7fff) AM_ROM
ADDRESS_MAP_END



/****************************************
 *
 *  Bulls Eye Darts CPU memory handlers
 *
 ****************************************/

static ADDRESS_MAP_START( bullsdrt_map, ADDRESS_SPACE_PROGRAM, 8 )
	AM_RANGE(0x0000, 0x0fff) AM_ROM
	AM_RANGE(0x1000, 0x1000) AM_MIRROR(0x6000) AM_READ(input_port_3_r)
	AM_RANGE(0x1080, 0x1080) AM_MIRROR(0x6000) AM_READ(centiped_IN0_r)
	AM_RANGE(0x1081, 0x1081) AM_MIRROR(0x6000) AM_READ(input_port_1_r)
	AM_RANGE(0x1082, 0x1082) AM_MIRROR(0x6000) AM_READ(centiped_IN2_r)
	AM_RANGE(0x1200, 0x123f) AM_MIRROR(0x6000) AM_READWRITE(atari_vg_earom_r, atari_vg_earom_w)
	AM_RANGE(0x1280, 0x1280) AM_MIRROR(0x6000) AM_WRITE(atari_vg_earom_ctrl_w)
	AM_RANGE(0x1300, 0x1300) AM_MIRROR(0x6000) AM_READ(input_port_4_r)
	AM_RANGE(0x1400, 0x140f) AM_MIRROR(0x6000) AM_WRITE(centiped_paletteram_w) AM_BASE(&paletteram)
	AM_RANGE(0x1481, 0x1481) AM_MIRROR(0x6000) AM_WRITE(bullsdrt_coin_count_w)
	AM_RANGE(0x1483, 0x1484) AM_MIRROR(0x6000) AM_WRITE(led_w)
	AM_RANGE(0x1487, 0x1487) AM_MIRROR(0x6000) AM_WRITE(centiped_flip_screen_w)
	AM_RANGE(0x1500, 0x1500) AM_MIRROR(0x6000) AM_WRITE(watchdog_reset_w)
	AM_RANGE(0x1580, 0x1580) AM_MIRROR(0x6000) AM_NOP
	AM_RANGE(0x1800, 0x1bbf) AM_MIRROR(0x6000) AM_WRITE(centiped_videoram_w) AM_BASE(&videoram)
	AM_RANGE(0x1bc0, 0x1bff) AM_MIRROR(0x6000) AM_RAM AM_BASE(&spriteram)
	AM_RANGE(0x1c00, 0x1fff) AM_MIRROR(0x6000) AM_RAM
	AM_RANGE(0x2000, 0x2fff) AM_ROM
	AM_RANGE(0x4000, 0x4fff) AM_ROM
	AM_RANGE(0x6000, 0x6fff) AM_ROM
ADDRESS_MAP_END

static ADDRESS_MAP_START( bullsdrt_port_map, ADDRESS_SPACE_IO, 8 )
	AM_RANGE(0x00, 0x00) AM_WRITE(bullsdrt_sprites_bank_w)
	AM_RANGE(0x20, 0x3f) AM_WRITE(bullsdrt_tilesbank_w) AM_BASE(&bullsdrt_tiles_bankram)
	AM_RANGE(S2650_DATA_PORT, S2650_DATA_PORT) AM_READWRITE(bullsdrt_data_port_r, SN76496_0_w)
ADDRESS_MAP_END



/*************************************
 *
 *  Port definitions
 *
 *************************************/

/* The input ports are identical for the real one and the bootleg one, except
   that one of the languages is Italian in the bootleg one instead of Spanish */

#define PORTS(GAMENAME, FOURTH_LANGUAGE)										\
																				\
INPUT_PORTS_START( GAMENAME )													\
	PORT_START	/* IN0 */														\
	PORT_BIT( 0x0f, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball data */		\
	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Cabinet ))								\
	PORT_DIPSETTING(    0x00, DEF_STR( Upright ))								\
	PORT_DIPSETTING(    0x10, DEF_STR( Cocktail ))								\
	PORT_SERVICE( 0x20, IP_ACTIVE_LOW )											\
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_VBLANK )								\
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball sign bit */	\
																				\
	PORT_START	/* IN1 */														\
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START1 )									\
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START2 )									\
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON1 )								\
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL					\
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_TILT )									\
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_COIN1 )									\
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN2 )									\
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE1 )								\
																				\
	PORT_START	/* IN2 */														\
	PORT_BIT( 0x0f, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball data */		\
	PORT_BIT( 0x70, IP_ACTIVE_HIGH, IPT_UNKNOWN )								\
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball sign bit */	\
																				\
	PORT_START	/* IN3 */														\
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_COCKTAIL\
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_COCKTAIL	\
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_COCKTAIL\
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_COCKTAIL\
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY					\
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY				\
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY				\
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY				\
																				\
	PORT_START	/* IN4 */														\
	PORT_DIPNAME( 0x03, 0x00, DEF_STR( Language ) )										\
	PORT_DIPSETTING(    0x00, DEF_STR( English ) )										\
	PORT_DIPSETTING(    0x01, DEF_STR( German ) )										\
	PORT_DIPSETTING(    0x02, DEF_STR( French ) )										\
	PORT_DIPSETTING(    0x03, FOURTH_LANGUAGE )									\
	PORT_DIPNAME( 0x0c, 0x04, DEF_STR( Lives ))									\
	PORT_DIPSETTING(    0x00, "2" )												\
	PORT_DIPSETTING(    0x04, "3" )												\
	PORT_DIPSETTING(    0x08, "4" )												\
	PORT_DIPSETTING(    0x0c, "5" )												\
	PORT_DIPNAME( 0x30, 0x10, DEF_STR( Bonus_Life ))							\
	PORT_DIPSETTING(    0x00, "10000" )											\
	PORT_DIPSETTING(    0x10, "12000" )											\
	PORT_DIPSETTING(    0x20, "15000" )											\
	PORT_DIPSETTING(    0x30, "20000" )											\
	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Difficulty ))							\
	PORT_DIPSETTING(    0x40, DEF_STR( Easy ) )											\
	PORT_DIPSETTING(    0x00, DEF_STR( Hard ) )											\
	PORT_DIPNAME( 0x80, 0x00, "Credit Minimum" )								\
	PORT_DIPSETTING(    0x00, "1" )												\
	PORT_DIPSETTING(    0x80, "2" )												\
																				\
	PORT_START	/* IN5 */														\
	PORT_DIPNAME( 0x03, 0x02, DEF_STR( Coinage ))								\
	PORT_DIPSETTING(    0x03, DEF_STR( 2C_1C ))									\
	PORT_DIPSETTING(    0x02, DEF_STR( 1C_1C ))									\
	PORT_DIPSETTING(    0x01, DEF_STR( 1C_2C ))									\
	PORT_DIPSETTING(    0x00, DEF_STR( Free_Play ))								\
	PORT_DIPNAME( 0x0c, 0x00, "Right Coin" )									\
	PORT_DIPSETTING(    0x00, "*1" )											\
	PORT_DIPSETTING(    0x04, "*4" )											\
	PORT_DIPSETTING(    0x08, "*5" )											\
	PORT_DIPSETTING(    0x0c, "*6" )											\
	PORT_DIPNAME( 0x10, 0x00, "Left Coin" )										\
	PORT_DIPSETTING(    0x00, "*1" )											\
	PORT_DIPSETTING(    0x10, "*2" )											\
	PORT_DIPNAME( 0xe0, 0x00, "Bonus Coins" )									\
	PORT_DIPSETTING(    0x00, DEF_STR( None ) )											\
	PORT_DIPSETTING(    0x20, "3 credits/2 coins" )								\
	PORT_DIPSETTING(    0x40, "5 credits/4 coins" )								\
	PORT_DIPSETTING(    0x60, "6 credits/4 coins" )								\
	PORT_DIPSETTING(    0x80, "6 credits/5 coins" )								\
	PORT_DIPSETTING(    0xa0, "4 credits/3 coins" )								\
																				\
	PORT_START	/* IN6, fake trackball input port. */							\
	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_X ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_REVERSE	\
																				\
	PORT_START	/* IN7, fake trackball input port. */							\
	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) \
																				\
	PORT_START	/* IN8, fake trackball input port. */							\
	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_X ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_COCKTAIL	\
																				\
	PORT_START	/* IN9, fake trackball input port. */							\
	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_REVERSE PORT_COCKTAIL	\
INPUT_PORTS_END

PORTS(centiped, DEF_STR( Spanish ))
PORTS(caterplr, DEF_STR( Italian ))


INPUT_PORTS_START( centtime )
	PORT_START	/* IN0 */
	PORT_BIT( 0x0f, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball data */
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_SERVICE( 0x20, IP_ACTIVE_LOW )
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_VBLANK )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball sign bit */

	PORT_START	/* IN1 */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_TILT )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE1 )

	PORT_START	/* IN2 */
	PORT_BIT( 0x0f, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball data */
	PORT_BIT( 0x70, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball sign bit */

	PORT_START	/* IN3 */
	PORT_BIT( 0x0f, IP_ACTIVE_LOW, IPT_UNUSED )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY

	PORT_START	/* IN4 */
	PORT_DIPNAME( 0x03, 0x00, DEF_STR( Language ) )
	PORT_DIPSETTING(    0x00, DEF_STR( English ) )
	PORT_DIPSETTING(    0x01, DEF_STR( German ) )
	PORT_DIPSETTING(    0x02, DEF_STR( French ) )
	PORT_DIPSETTING(    0x03, DEF_STR( Spanish ) )
	PORT_DIPNAME( 0x0c, 0x04, DEF_STR( Lives ))
	PORT_DIPSETTING(    0x00, "2" )
	PORT_DIPSETTING(    0x04, "3" )
	PORT_DIPSETTING(    0x08, "4" )
	PORT_DIPSETTING(    0x0c, "5" )
	PORT_DIPNAME( 0x30, 0x10, DEF_STR( Bonus_Life ))
	PORT_DIPSETTING(    0x00, "10000" )
	PORT_DIPSETTING(    0x10, "12000" )
	PORT_DIPSETTING(    0x20, "15000" )
	PORT_DIPSETTING(    0x30, "20000" )
	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Difficulty ))
	PORT_DIPSETTING(    0x40, DEF_STR( Easy ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Hard ) )
	PORT_DIPNAME( 0x80, 0x00, "Credit Minimum" )
	PORT_DIPSETTING(    0x00, "1" )
	PORT_DIPSETTING(    0x80, "2" )

	PORT_START	/* IN5 */
	PORT_DIPNAME( 0x03, 0x02, DEF_STR( Coinage ))
	PORT_DIPSETTING(    0x03, DEF_STR( 2C_1C ))
	PORT_DIPSETTING(    0x02, DEF_STR( 1C_1C ))
	PORT_DIPSETTING(    0x01, DEF_STR( 1C_2C ))
	PORT_DIPSETTING(    0x00, DEF_STR( Free_Play ))
	PORT_DIPNAME( 0x1c, 0x00, DEF_STR( Game_Time ) )
	PORT_DIPSETTING(    0x00, "Untimed" )
	PORT_DIPSETTING(    0x04, "1 Minute" )
	PORT_DIPSETTING(    0x08, "2 Minutes" )
	PORT_DIPSETTING(    0x0c, "3 Minutes" )
	PORT_DIPSETTING(    0x10, "4 Minutes" )
	PORT_DIPSETTING(    0x14, "5 Minutes" )
	PORT_DIPSETTING(    0x18, "6 Minutes" )
	PORT_DIPSETTING(    0x1c, "7 Minutes" )
	PORT_DIPNAME( 0xe0, 0x00, "Bonus Coins" )
	PORT_DIPSETTING(    0x00, DEF_STR( None ) )
	PORT_DIPSETTING(    0x20, "3 credits/2 coins" )
	PORT_DIPSETTING(    0x40, "5 credits/4 coins" )
	PORT_DIPSETTING(    0x60, "6 credits/4 coins" )
	PORT_DIPSETTING(    0x80, "6 credits/5 coins" )
	PORT_DIPSETTING(    0xa0, "4 credits/3 coins" )

	PORT_START	/* IN6, fake trackball input port. */
	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_X ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_REVERSE

	PORT_START	/* IN7, fake trackball input port. */
	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10)

	PORT_START	/* IN8, place for cocktail trackball (not used) */
	PORT_BIT( 0xff, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START	/* IN9, place for cocktail trackball (not used) */
	PORT_BIT( 0xff, IP_ACTIVE_LOW, IPT_UNUSED )
INPUT_PORTS_END


INPUT_PORTS_START( magworm )
	PORT_START	/* IN0 */
	PORT_BIT( 0x0f, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball data */
	PORT_DIPNAME( 0x10, 0x00, DEF_STR( Cabinet ))
	PORT_DIPSETTING(    0x00, DEF_STR( Upright ))
	PORT_DIPSETTING(    0x10, DEF_STR( Cocktail ))
	PORT_SERVICE( 0x20, IP_ACTIVE_LOW )
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_VBLANK )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball sign bit */

	PORT_START	/* IN1 */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_TILT )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE1 )

	PORT_START	/* IN2 */
	PORT_BIT( 0x0f, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball data */
	PORT_BIT( 0x70, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball sign bit */

	PORT_START	/* IN3 */
	PORT_BIT( 0xff, IP_ACTIVE_LOW, IPT_UNKNOWN )

	PORT_START	/* IN4 */
	PORT_DIPNAME( 0x03, 0x02, DEF_STR( Coinage ))
	PORT_DIPSETTING(    0x03, DEF_STR( 2C_1C ))
	PORT_DIPSETTING(    0x02, DEF_STR( 1C_1C ))
	PORT_DIPSETTING(    0x01, DEF_STR( 1C_2C ))
	PORT_DIPSETTING(    0x00, DEF_STR( Free_Play ))
	PORT_DIPNAME( 0x0c, 0x00, "Right Coin" )
	PORT_DIPSETTING(    0x00, "*3" )
	PORT_DIPSETTING(    0x04, "*7" )
	PORT_DIPSETTING(    0x08, "*1/2" )
	PORT_DIPSETTING(    0x0c, "*6" )
	PORT_DIPNAME( 0x30, 0x00, DEF_STR( Language ) )
	PORT_DIPSETTING(    0x00, DEF_STR( English ) )
	PORT_DIPSETTING(    0x10, DEF_STR( German ) )
	PORT_DIPSETTING(    0x20, DEF_STR( French ) )
	PORT_DIPSETTING(    0x30, DEF_STR( Spanish ) )
	PORT_DIPNAME( 0xc0, 0x40, DEF_STR( Lives ))
	PORT_DIPSETTING(    0x00, "2" )
	PORT_DIPSETTING(    0x40, "3" )
	PORT_DIPSETTING(    0x80, "4" )
	PORT_DIPSETTING(    0xc0, "5" )

	PORT_START	/* IN5 */
	PORT_DIPNAME( 0x01, 0x00, "Left Coin" )
	PORT_DIPSETTING(    0x00, "*1" )
	PORT_DIPSETTING(    0x01, "*2" )
	PORT_DIPNAME( 0x0e, 0x00, "Bonus Coins" )
	PORT_DIPSETTING(    0x00, DEF_STR( None ) )
	PORT_DIPSETTING(    0x02, "3 credits/2 coins" )
	PORT_DIPSETTING(    0x04, "5 credits/4 coins" )
	PORT_DIPSETTING(    0x06, "6 credits/4 coins" )
	PORT_DIPSETTING(    0x08, "6 credits/5 coins" )
	PORT_DIPSETTING(    0x0a, "4 credits/3 coins" )
	PORT_DIPNAME( 0x30, 0x10, DEF_STR( Bonus_Life ))
	PORT_DIPSETTING(    0x00, "10000" )
	PORT_DIPSETTING(    0x10, "12000" )
	PORT_DIPSETTING(    0x20, "15000" )
	PORT_DIPSETTING(    0x30, "20000" )
	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Difficulty ))
	PORT_DIPSETTING(    0x40, DEF_STR( Easy ) )
	PORT_DIPSETTING(    0x00, DEF_STR( Hard ) )
	PORT_DIPNAME( 0x80, 0x00, "Credit Minimum" )
	PORT_DIPSETTING(    0x00, "1" )
	PORT_DIPSETTING(    0x80, "2" )

	PORT_START	/* IN6, fake trackball input port. */
	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_X ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_REVERSE

	PORT_START	/* IN7, fake trackball input port. */
	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10)

	PORT_START	/* IN8, fake trackball input port. */
	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_X ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_COCKTAIL

	PORT_START	/* IN9, fake trackball input port. */
	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_REVERSE PORT_COCKTAIL
INPUT_PORTS_END


INPUT_PORTS_START( milliped )
	PORT_START	/* IN0 $2000 */ /* see port 6 for x trackball */
	PORT_DIPNAME(0x03, 0x00, DEF_STR( Language ) )
	PORT_DIPSETTING(   0x00, DEF_STR( English ) )
	PORT_DIPSETTING(   0x01, DEF_STR( German ) )
	PORT_DIPSETTING(   0x02, DEF_STR( French ) )
	PORT_DIPSETTING(   0x03, DEF_STR( Spanish ) )
	PORT_DIPNAME(0x0c, 0x04, "Bonus" )
	PORT_DIPSETTING(   0x00, "0" )
	PORT_DIPSETTING(   0x04, "0 1x" )
	PORT_DIPSETTING(   0x08, "0 1x 2x" )
	PORT_DIPSETTING(   0x0c, "0 1x 2x 3x" )
	PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT ( 0x40, IP_ACTIVE_HIGH, IPT_VBLANK )
	PORT_BIT ( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball sign bit */

	PORT_START	/* IN1 $2001 */ /* see port 7 for y trackball */
	PORT_DIPNAME(0x01, 0x00, DEF_STR( Unknown ))
	PORT_DIPSETTING(   0x00, DEF_STR( Off ))
	PORT_DIPSETTING(   0x01, DEF_STR( On ))
	PORT_DIPNAME(0x02, 0x00, DEF_STR( Unknown ))
	PORT_DIPSETTING(   0x00, DEF_STR( Off ))
	PORT_DIPSETTING(   0x02, DEF_STR( On ))
	PORT_DIPNAME(0x04, 0x00, "Credit Minimum" )
	PORT_DIPSETTING(   0x00, "1" )
	PORT_DIPSETTING(   0x04, "2" )
	PORT_DIPNAME(0x08, 0x00, "Coin Counters" )
	PORT_DIPSETTING(   0x00, "1" )
	PORT_DIPSETTING(   0x08, "2" )
	PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL
	PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT ( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball sign bit */

	PORT_START	/* IN2 $2010 */
	PORT_BIT ( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY
	PORT_BIT ( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY
	PORT_BIT ( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY
	PORT_BIT ( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY
	PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_TILT )
	PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT ( 0x80, IP_ACTIVE_LOW, IPT_SERVICE1 )

	PORT_START	/* IN3 $2011 */
	PORT_BIT ( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_8WAY PORT_COCKTAIL
	PORT_BIT ( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_8WAY PORT_COCKTAIL
	PORT_BIT ( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_8WAY PORT_COCKTAIL
	PORT_BIT ( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_8WAY PORT_COCKTAIL
	PORT_BIT ( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT ( 0x20, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT ( 0x40, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_SERVICE( 0x80, IP_ACTIVE_LOW )

	PORT_START	/* 4 */ /* DSW1 $0408 */
	PORT_DIPNAME(0x01, 0x00, "Millipede Head" )
	PORT_DIPSETTING(   0x00, DEF_STR( Easy ) )
	PORT_DIPSETTING(   0x01, DEF_STR( Hard ) )
	PORT_DIPNAME(0x02, 0x00, "Beetle" )
	PORT_DIPSETTING(   0x00, DEF_STR( Easy ) )
	PORT_DIPSETTING(   0x02, DEF_STR( Hard ) )
	PORT_DIPNAME(0x0c, 0x04, DEF_STR( Lives ))
	PORT_DIPSETTING(   0x00, "2" )
	PORT_DIPSETTING(   0x04, "3" )
	PORT_DIPSETTING(   0x08, "4" )
	PORT_DIPSETTING(   0x0c, "5" )
	PORT_DIPNAME(0x30, 0x10, DEF_STR( Bonus_Life ))
	PORT_DIPSETTING(   0x00, "12000" )
	PORT_DIPSETTING(   0x10, "15000" )
	PORT_DIPSETTING(   0x20, "20000" )
	PORT_DIPSETTING(   0x30, DEF_STR( None ) )
	PORT_DIPNAME(0x40, 0x00, "Spider" )
	PORT_DIPSETTING(   0x00, DEF_STR( Easy ) )
	PORT_DIPSETTING(   0x40, DEF_STR( Hard ) )
	PORT_DIPNAME(0x80, 0x00, "Starting Score Select" )
	PORT_DIPSETTING(   0x80, DEF_STR( Off ))
	PORT_DIPSETTING(   0x00, DEF_STR( On ))

	PORT_START	/* 5 */ /* DSW2 $0808 */
	PORT_DIPNAME(0x03, 0x02, DEF_STR( Coinage ))
	PORT_DIPSETTING(   0x03, DEF_STR( 2C_1C ))
	PORT_DIPSETTING(   0x02, DEF_STR( 1C_1C ))
	PORT_DIPSETTING(   0x01, DEF_STR( 1C_2C ))
	PORT_DIPSETTING(   0x00, DEF_STR( Free_Play ))
	PORT_DIPNAME(0x0c, 0x00, "Right Coin" )
	PORT_DIPSETTING(   0x00, "*1" )
	PORT_DIPSETTING(   0x04, "*4" )
	PORT_DIPSETTING(   0x08, "*5" )
	PORT_DIPSETTING(   0x0c, "*6" )
	PORT_DIPNAME(0x10, 0x00, "Left Coin" )
	PORT_DIPSETTING(   0x00, "*1" )
	PORT_DIPSETTING(   0x10, "*2" )
	PORT_DIPNAME(0xe0, 0x00, "Bonus Coins" )
	PORT_DIPSETTING(   0x00, DEF_STR( None ) )
	PORT_DIPSETTING(   0x20, "3 credits/2 coins" )
	PORT_DIPSETTING(   0x40, "5 credits/4 coins" )
	PORT_DIPSETTING(   0x60, "6 credits/4 coins" )
	PORT_DIPSETTING(   0x80, "6 credits/5 coins" )
	PORT_DIPSETTING(   0xa0, "4 credits/3 coins" )
	PORT_DIPSETTING(   0xc0, "Demo mode" )

	PORT_START	/* IN6, fake trackball input port. */
	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_X ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_REVERSE

	PORT_START	/* IN7, fake trackball input port. */
	PORT_BIT( 0xff, 0x00, IPT_TRACKBALL_Y ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10)
INPUT_PORTS_END


INPUT_PORTS_START( warlords )
	PORT_START	/* IN0 */
	PORT_BIT( 0x0f, IP_ACTIVE_HIGH, IPT_UNUSED )
	PORT_DIPNAME( 0x10, 0x00, "Diag Step" )  /* Not referenced */
	PORT_DIPSETTING(    0x00, DEF_STR( Off ))
	PORT_DIPSETTING(    0x10, DEF_STR( On ))
	PORT_SERVICE( 0x20, IP_ACTIVE_LOW )
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_VBLANK )
	PORT_DIPNAME( 0x80, 0x00, DEF_STR( Cabinet ))
	PORT_DIPSETTING(    0x80, "Upright (no overlay)" )
	PORT_DIPSETTING(    0x00, "Cocktail (overlay)" )

	PORT_START	/* IN1 */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(1)
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(2)
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(3)
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_PLAYER(4)
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_TILT )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_SERVICE1 )

	PORT_START	/* IN2 */
	PORT_DIPNAME( 0x03, 0x00, DEF_STR( Language ) )
	PORT_DIPSETTING(    0x00, DEF_STR( English ) )
	PORT_DIPSETTING(    0x01, DEF_STR( French ) )
	PORT_DIPSETTING(    0x02, DEF_STR( Spanish ) )
	PORT_DIPSETTING(    0x03, DEF_STR( German ) )
	PORT_DIPNAME( 0x04, 0x00, "Music" )
	PORT_DIPSETTING(    0x00, "End of game" )
	PORT_DIPSETTING(    0x04, "High score only" )
	PORT_BIT( 0xc8, IP_ACTIVE_HIGH, IPT_UNUSED )
	PORT_DIPNAME( 0x30, 0x00, "Credits" )
	PORT_DIPSETTING(    0x00, "1p/2p = 1 credit" )
	PORT_DIPSETTING(    0x10, "1p = 1, 2p = 2" )
	PORT_DIPSETTING(    0x20, "1p/2p = 2 credits" )

	PORT_START	/* IN3 */
	PORT_DIPNAME( 0x03, 0x02, DEF_STR( Coinage ))
	PORT_DIPSETTING(    0x03, DEF_STR( 2C_1C ))
	PORT_DIPSETTING(    0x02, DEF_STR( 1C_1C ))
	PORT_DIPSETTING(    0x01, DEF_STR( 1C_2C ))
	PORT_DIPSETTING(    0x00, DEF_STR( Free_Play ))
	PORT_DIPNAME( 0x0c, 0x00, "Right Coin" )
	PORT_DIPSETTING(    0x00, "*1" )
	PORT_DIPSETTING(    0x04, "*4" )
	PORT_DIPSETTING(    0x08, "*5" )
	PORT_DIPSETTING(    0x0c, "*6" )
	PORT_DIPNAME( 0x10, 0x00, "Left Coin" )
	PORT_DIPSETTING(    0x00, "*1" )
	PORT_DIPSETTING(    0x10, "*2" )
	PORT_DIPNAME( 0xe0, 0x00, "Bonus Coins" )
	PORT_DIPSETTING(    0x00, DEF_STR( None ) )
	PORT_DIPSETTING(    0x20, "3 credits/2 coins" )
	PORT_DIPSETTING(    0x40, "5 credits/4 coins" )
	PORT_DIPSETTING(    0x60, "6 credits/4 coins" )
	PORT_DIPSETTING(    0x80, "6 credits/5 coins" )

	/* IN4-7 fake to control player paddles */
	PORT_START
	PORT_BIT( 0xff, 0x80, IPT_PADDLE ) PORT_MINMAX(0x1d,0xcb) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_CENTERDELTA(0) PORT_PLAYER(1)

	PORT_START
	PORT_BIT( 0xff, 0x80, IPT_PADDLE ) PORT_MINMAX(0x1d,0xcb) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_CENTERDELTA(0) PORT_PLAYER(2)

	PORT_START
	PORT_BIT( 0xff, 0x80, IPT_PADDLE ) PORT_MINMAX(0x1d,0xcb) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_CENTERDELTA(0) PORT_PLAYER(3)

	PORT_START
	PORT_BIT( 0xff, 0x80, IPT_PADDLE ) PORT_MINMAX(0x1d,0xcb) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_CENTERDELTA(0) PORT_PLAYER(4)
INPUT_PORTS_END


INPUT_PORTS_START( bullsdrt )
	PORT_START	/* IN0 */
	PORT_BIT( 0x0f, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball data */
	PORT_BIT( 0x30, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_VBLANK )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball sign bit */

	PORT_START	/* IN1 */
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_BUTTON1 )
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_UNKNOWN )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_COIN3 )

	PORT_START	/* IN2 */
	PORT_BIT( 0x0f, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball data */
	PORT_BIT( 0x70, IP_ACTIVE_LOW,  IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_SPECIAL )	/* trackball sign bit */

	PORT_START
	PORT_DIPNAME( 0x01, 0x01, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x01, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x02, 0x02, "Award Free Game" )
	PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x04, 0x04, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x04, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x80, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )

	PORT_START
	PORT_DIPNAME( 0x01, 0x01, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x01, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x02, 0x02, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x04, 0x04, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x04, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )
	PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unknown ) )
	PORT_DIPSETTING(    0x80, DEF_STR( Off ) )
	PORT_DIPSETTING(    0x00, DEF_STR( On ) )

	PORT_START
	/* not used */

	PORT_START	/* IN6, fake trackball input port. */
	PORT_BIT( 0xff, 0x80, IPT_TRACKBALL_X ) PORT_MINMAX(0x1d,0xcb) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_REVERSE

	PORT_START	/* IN7, fake trackball input port. */
	PORT_BIT( 0xff, 0x80, IPT_TRACKBALL_Y ) PORT_MINMAX(0x1d,0xcb) PORT_SENSITIVITY(50) PORT_KEYDELTA(10)
INPUT_PORTS_END



/*************************************
 *
 *  Graphics layouts: Centipede/Millipede
 *
 *************************************/

static gfx_layout charlayout =
{
	8,8,
	RGN_FRAC(1,2),
	2,
	{ RGN_FRAC(1,2), 0 },
	{ 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 gfx_layout spritelayout =
{
	8,16,
	RGN_FRAC(1,2),
	2,
	{ RGN_FRAC(1,2), 0 },
	{ 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, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
	16*8
};

static gfx_decode centiped_gfxdecodeinfo[] =
{
	{ REGION_GFX1, 0, &charlayout,     0, 1 },
	{ REGION_GFX1, 0, &spritelayout,   4, 4*4*4 },
	{ -1 }
};

static gfx_decode milliped_gfxdecodeinfo[] =
{
	{ REGION_GFX1, 0, &charlayout,     0, 4 },
	{ REGION_GFX1, 0, &spritelayout, 4*4, 4*4*4*4 },
	{ -1 }
};



/*************************************
 *
 *  Graphics layouts: Warlords
 *
 *************************************/

static gfx_layout warlords_charlayout =
{
	8,8,
	RGN_FRAC(1,4),
	2,
	{ RGN_FRAC(1,2), 0 },
	{ 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 gfx_decode warlords_gfxdecodeinfo[] =
{
	{ REGION_GFX1, 0x000, &warlords_charlayout, 0,   8 },
	{ REGION_GFX1, 0x200, &warlords_charlayout, 8*4, 8*4 },
	{ -1 }
};



/*************************************
 *
 *  Sound interfaces
 *
 *************************************/

static struct AY8910interface centipdb_ay8910_interface =
{
	caterplr_rand_r
};


static struct POKEYinterface milliped_pokey_interface_1 =
{
	{ 0 },
	input_port_4_r
};


static struct POKEYinterface milliped_pokey_interface_2 =
{
	{ 0 },
	input_port_5_r
};


static struct POKEYinterface warlords_pokey_interface =
{
	{ input_port_4_r,input_port_5_r,input_port_6_r,input_port_7_r }
};



/*************************************
 *
 *  Machine drivers
 *
 *************************************/

static MACHINE_DRIVER_START( centiped )

	/* basic machine hardware */
	MDRV_CPU_ADD_TAG("main", M6502, 12096000/8)	/* 1.512 MHz (slows down to 0.75MHz while accessing playfield RAM) */
	MDRV_CPU_PROGRAM_MAP(centiped_map,0)

	MDRV_FRAMES_PER_SECOND(60)
	MDRV_VBLANK_DURATION(1460)

	MDRV_MACHINE_INIT(centiped)
	MDRV_NVRAM_HANDLER(atari_vg)

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER)
	MDRV_SCREEN_SIZE(32*8, 32*8)
	MDRV_VISIBLE_AREA(0*8, 32*8-1, 0*8, 30*8-1)
	MDRV_GFXDECODE(centiped_gfxdecodeinfo)
	MDRV_PALETTE_LENGTH(4+4)
	MDRV_COLORTABLE_LENGTH(4+4*4*4*4)

	MDRV_PALETTE_INIT(centiped)
	MDRV_VIDEO_START(centiped)
	MDRV_VIDEO_UPDATE(centiped)

	/* sound hardware */
	MDRV_SPEAKER_STANDARD_MONO("mono")

	MDRV_SOUND_ADD_TAG("pokey", POKEY, 12096000/8)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MACHINE_DRIVER_END


static MACHINE_DRIVER_START( caterplr )

	/* basic machine hardware */
	MDRV_IMPORT_FROM(centiped)

	/* sound hardware */
	MDRV_SOUND_REPLACE("pokey", AY8910, 12096000/8)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
MACHINE_DRIVER_END


static MACHINE_DRIVER_START( centipdb )

	/* basic machine hardware */
	MDRV_IMPORT_FROM(centiped)
	MDRV_CPU_MODIFY("main")
	MDRV_CPU_PROGRAM_MAP(centipdb_map,0)

	/* sound hardware */
	MDRV_SOUND_REPLACE("pokey", AY8910, 12096000/8)
	MDRV_SOUND_CONFIG(centipdb_ay8910_interface)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MACHINE_DRIVER_END


static MACHINE_DRIVER_START( magworm )

	/* basic machine hardware */
	MDRV_IMPORT_FROM(centiped)
	MDRV_MACHINE_INIT(magworm)

	/* sound hardware */
	MDRV_SOUND_REPLACE("pokey", AY8910, 12096000/8)
	MDRV_SOUND_CONFIG(centipdb_ay8910_interface)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MACHINE_DRIVER_END


static MACHINE_DRIVER_START( milliped )

	/* basic machine hardware */
	MDRV_IMPORT_FROM(centiped)
	MDRV_CPU_MODIFY("main")
	MDRV_CPU_PROGRAM_MAP(milliped_map,0)

	/* video hardware */
	MDRV_GFXDECODE(milliped_gfxdecodeinfo)
	MDRV_PALETTE_LENGTH(4*4+4*4)
	MDRV_COLORTABLE_LENGTH(4*4+4*4*4*4*4)

	MDRV_PALETTE_INIT(milliped)
	MDRV_VIDEO_START(milliped)

	/* sound hardware */
	MDRV_SOUND_REPLACE("pokey", POKEY, 12096000/8)
	MDRV_SOUND_CONFIG(milliped_pokey_interface_1)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)

	MDRV_SOUND_ADD(POKEY, 12096000/8)
	MDRV_SOUND_CONFIG(milliped_pokey_interface_2)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
MACHINE_DRIVER_END


static MACHINE_DRIVER_START( warlords )

	/* basic machine hardware */
	MDRV_IMPORT_FROM(centiped)
	MDRV_CPU_MODIFY("main")
	MDRV_CPU_PROGRAM_MAP(warlords_map,0)

	/* video hardware */
	MDRV_GFXDECODE(warlords_gfxdecodeinfo)
	MDRV_PALETTE_LENGTH(128)
	MDRV_COLORTABLE_LENGTH(8*4+8*4)

	MDRV_PALETTE_INIT(warlords)
	MDRV_VIDEO_START(warlords)
	MDRV_VIDEO_UPDATE(warlords)

	/* sound hardware */
	MDRV_SOUND_REPLACE("pokey", POKEY, 12096000/8)
	MDRV_SOUND_CONFIG(warlords_pokey_interface)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MACHINE_DRIVER_END


static MACHINE_DRIVER_START( bullsdrt )

	/* basic machine hardware */
	MDRV_CPU_ADD(S2650, 12096000/8)
	MDRV_CPU_PROGRAM_MAP(bullsdrt_map,0)
	MDRV_CPU_IO_MAP(bullsdrt_port_map,0)

	MDRV_FRAMES_PER_SECOND(60)
	MDRV_VBLANK_DURATION(1460)

	MDRV_NVRAM_HANDLER(atari_vg)

	/* video hardware */
	MDRV_VIDEO_ATTRIBUTES(VIDEO_TYPE_RASTER)
	MDRV_SCREEN_SIZE(32*8, 32*8)
	MDRV_VISIBLE_AREA(0*8, 32*8-1, 0*8, 30*8-1)
	MDRV_GFXDECODE(centiped_gfxdecodeinfo)
	MDRV_PALETTE_LENGTH(4+4)
	MDRV_COLORTABLE_LENGTH(4+4*4*4*4)
	MDRV_PALETTE_INIT(centiped)

	MDRV_VIDEO_START(bullsdrt)
	MDRV_VIDEO_UPDATE(bullsdrt)

	/* sound hardware */
	MDRV_SPEAKER_STANDARD_MONO("mono")

	MDRV_SOUND_ADD(SN76496, 12096000/8)
	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
MACHINE_DRIVER_END



/*************************************
 *
 *  ROM definitions
 *
 *************************************/

ROM_START( centiped )
	ROM_REGION( 0x10000, REGION_CPU1, 0 )	/* 64k for code */
	ROM_LOAD( "centiped.307", 0x2000, 0x0800, CRC(5ab0d9de) SHA1(8ea6e3304202831aabaf31dbd0f970a7b3bfe421) )
	ROM_LOAD( "centiped.308", 0x2800, 0x0800, CRC(4c07fd3e) SHA1(af4fdbf32c23b1864819d620a874e7f205da3cdb) )
	ROM_LOAD( "centiped.309", 0x3000, 0x0800, CRC(ff69b424) SHA1(689fa560d40a384dcbcad7c8095bc12e91875580) )
	ROM_LOAD( "centiped.310", 0x3800, 0x0800, CRC(44e40fa4) SHA1(c557db83876afc8ab52047ab1a3c3bfef34d6351) )

	ROM_REGION( 0x1000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "centiped.211", 0x0000, 0x0800, CRC(880acfb9) SHA1(6c862352c329776f2f9974a0df9dbe41f9dbc361) )
	ROM_LOAD( "centiped.212", 0x0800, 0x0800, CRC(b1397029) SHA1(974c03d29aeca672fffa4dfc00a06be6a851aacb) )

	ROM_REGION( 0x0100, REGION_PROMS, 0 )
	ROM_LOAD( "136001.213",   0x0000, 0x0100, CRC(6fa3093a) SHA1(2b7aeca74c1ae4156bf1878453a047330f96f0a8) )
ROM_END


ROM_START( centipd2 )
	ROM_REGION( 0x10000, REGION_CPU1, 0 )	/* 64k for code */
	ROM_LOAD( "centiped.207", 0x2000, 0x0800, CRC(b2909e2f) SHA1(90ec90bd1e262861730afd5b113ec8dddd958ed8) )
	ROM_LOAD( "centiped.208", 0x2800, 0x0800, CRC(110e04ff) SHA1(4cb481792411b6aefac561744cfbe107aba8bab3) )
	ROM_LOAD( "centiped.209", 0x3000, 0x0800, CRC(cc2edb26) SHA1(b3ea580afa6a1ac44662051fae19c1efc320fcd3) )
	ROM_LOAD( "centiped.210", 0x3800, 0x0800, CRC(93999153) SHA1(8788c2b39fc5bfbb147a5e7c26ad360bba8d1063) )

	ROM_REGION( 0x1000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "centiped.211", 0x0000, 0x0800, CRC(880acfb9) SHA1(6c862352c329776f2f9974a0df9dbe41f9dbc361) )
	ROM_LOAD( "centiped.212", 0x0800, 0x0800, CRC(b1397029) SHA1(974c03d29aeca672fffa4dfc00a06be6a851aacb) )

	ROM_REGION( 0x0100, REGION_PROMS, 0 )
	ROM_LOAD( "136001.213",   0x0000, 0x0100, CRC(6fa3093a) SHA1(2b7aeca74c1ae4156bf1878453a047330f96f0a8) )
ROM_END


ROM_START( centtime )
	ROM_REGION( 0x10000, REGION_CPU1, 0 )	/* 64k for code */
	ROM_LOAD( "cent_d1.bin",  0x2000, 0x0800, CRC(c4d995eb) SHA1(d0b2f0461cfa35842045d40ffb65e777703b773e) )
	ROM_LOAD( "cent_e1.bin",  0x2800, 0x0800, CRC(bcdebe1b) SHA1(53f3bf88a79ce40661c0a9381928e55d8c61777a) )
	ROM_LOAD( "cent_fh1.bin", 0x3000, 0x0800, CRC(66d7b04a) SHA1(8fa758095b618085090491dfb5ea114cdc87f9df) )
	ROM_LOAD( "cent_j1.bin",  0x3800, 0x0800, CRC(33ce4640) SHA1(780c2eb320f64fad6b265c0dada961646ed30174) )

	ROM_REGION( 0x1000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "centiped.211", 0x0000, 0x0800, CRC(880acfb9) SHA1(6c862352c329776f2f9974a0df9dbe41f9dbc361) )
	ROM_LOAD( "centiped.212", 0x0800, 0x0800, CRC(b1397029) SHA1(974c03d29aeca672fffa4dfc00a06be6a851aacb) )

	ROM_REGION( 0x0100, REGION_PROMS, 0 )
	ROM_LOAD( "136001.213",   0x0000, 0x0100, CRC(6fa3093a) SHA1(2b7aeca74c1ae4156bf1878453a047330f96f0a8) )
ROM_END


ROM_START( caterplr )
	ROM_REGION( 0x10000, REGION_CPU1, 0 )	/* 64k for code */
	ROM_LOAD( "olympia.c28",  0x2000, 0x0800, CRC(8a744e57) SHA1(0bc83fe01d929af4e5c7f2a8d1236560df41f9ce) )
	ROM_LOAD( "olympia.c29",  0x2800, 0x0800, CRC(bb897b10) SHA1(bb1039fe64774277870f675eb72dd9f3f596f865) )
	ROM_LOAD( "olympia.c30",  0x3000, 0x0800, CRC(2297c2ac) SHA1(129d111f80b837f7b44852162f4abfba31fc0d75) )
	ROM_LOAD( "olympia.c31",  0x3800, 0x0800, CRC(cc529d6b) SHA1(80d86371b0f969b434af6ffb3834adaf11d05ac2) )

	ROM_REGION( 0x1000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "olympia.c32",  0x0000, 0x0800, CRC(d91b9724) SHA1(5ff9ccb2769c853b44764bfe829ad1df08686dc6) )
	ROM_LOAD( "olympia.c33",  0x0800, 0x0800, CRC(c2b08489) SHA1(9427e54537312ee0a70ec7bd1c039e92f8cfadad) )

	ROM_REGION( 0x0100, REGION_PROMS, 0 )
	ROM_LOAD( "136001.213",   0x0000, 0x0100, CRC(6fa3093a) SHA1(2b7aeca74c1ae4156bf1878453a047330f96f0a8) )
ROM_END


ROM_START( centipdb )
	ROM_REGION( 0x10000, REGION_CPU1, 0 )	/* 64k for code */
	ROM_LOAD( "d1",  		  0x2000, 0x0800, CRC(b17b8e0b) SHA1(01944cf040cf23aeb4c50d4f2e63181e08a07310) )
	ROM_LOAD( "e1",  		  0x2800, 0x0800, CRC(7684398e) SHA1(eea8e05506a7af2fec55c2689e3caafc62ea524f) )
	ROM_LOAD( "h1",  		  0x3000, 0x0800, CRC(74580fe4) SHA1(35b8a8675e4e020e234e51c3e4bd4ee5c24b79d2) )
	ROM_LOAD( "j1",  		  0x3800, 0x0800, CRC(84600161) SHA1(e9a6801c6f59e2b34e692e9aa71845d2e64a2379) )
	ROM_LOAD( "k1",  		  0x6000, 0x0800, CRC(f1aa329b) SHA1(e4689de0f94d11f125ee7548a3f8128ff8e8da51) )

	ROM_REGION( 0x1000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "centiped.211", 0x0000, 0x0800, CRC(880acfb9) SHA1(6c862352c329776f2f9974a0df9dbe41f9dbc361) )
	ROM_LOAD( "centiped.212", 0x0800, 0x0800, CRC(b1397029) SHA1(974c03d29aeca672fffa4dfc00a06be6a851aacb) )

	ROM_REGION( 0x0100, REGION_PROMS, 0 )
	ROM_LOAD( "136001.213",   0x0000, 0x0100, CRC(6fa3093a) SHA1(2b7aeca74c1ae4156bf1878453a047330f96f0a8) )
ROM_END

ROM_START( millpac )
	ROM_REGION( 0x10000, REGION_CPU1, 0 ) /* 64k for code */
	ROM_LOAD( "millpac1.1d",  0x2000, 0x0800, CRC(4dd6913d) SHA1(9eca634e1a827f9bbcf3c532d44e175ac4751755) )
	ROM_LOAD( "millpac2.1e",  0x2800, 0x0800, CRC(411c81f1) SHA1(15184642522f0b7eab81301295d435c10ce2d78d) )
	ROM_LOAD( "millpac3.1h",  0x3000, 0x0800, CRC(577076cc) SHA1(3124fcfb56f33ebd17d2c0da1098023474187066) )
	ROM_LOAD( "millpac4.1j",  0x3800, 0x0800, CRC(89aedd75) SHA1(74635079e7103bf6fa9577f5980e1adaa34d9be0) )
	ROM_LOAD( "millpac5.1k",  0x6000, 0x0800, CRC(67ac481b) SHA1(cef839d1c9dd207fdf41ae47d5f279b783f2f4cf) )

	ROM_REGION( 0x1000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "millpac6.7f",  0x0000, 0x0800, CRC(79f05520) SHA1(25c9f3b4826f48830f5c42d41d4f030b49e58d6a) )
	ROM_LOAD( "millpac7.7j",  0x0800, 0x0800, CRC(4880b2bd) SHA1(1909b8fb275f38f1b57bf53ba348b866cc48a599) )

	ROM_REGION( 0x0100, REGION_PROMS, 0 )
	ROM_LOAD( "millpac.4p",   0x0000, 0x0100, CRC(ba40e1a9) SHA1(f7914ba974e5bdd0c24d415a537b5fe567a4de50) ) /* not used */
ROM_END


ROM_START( magworm )
	ROM_REGION( 0x10000, REGION_CPU1, 0 )	/* 64k for code */
	ROM_LOAD( "magworm.0",	  0x2000, 0x0800, CRC(a88e970a) SHA1(f0cc6fdcdecf05f11cef7ebae4e11783a8bbc5ba) )
	ROM_LOAD( "magworm.1",	  0x2800, 0x0800, CRC(7a04047e) SHA1(3c00756c8ffbc5e78d4a7409802cc2ed8f668264) )
	ROM_LOAD( "magworm.2",	  0x3000, 0x0800, CRC(f127f1c3) SHA1(3fddcd6f458ac60eaebacef921b522dd2c7b8141) )
	ROM_LOAD( "magworm.3",	  0x3800, 0x0800, CRC(478d92b4) SHA1(99cce957c50ca80ddde408d9188fc2ed04d8da68) )

	ROM_REGION( 0x1000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "magworm.4",    0x0000, 0x0800, CRC(cea64e1a) SHA1(9022102124e1ad93f912ce8bdf85f8a886b0879b) )
	ROM_LOAD( "magworm.5",    0x0800, 0x0800, CRC(24558ea5) SHA1(8cd7131e19afd7a96191b1b3c3fba7ae9a140f4b) )
ROM_END


ROM_START( milliped )
	ROM_REGION( 0x10000, REGION_CPU1, 0 )	/* 64k for code */
	ROM_LOAD( "milliped.104", 0x4000, 0x1000, CRC(40711675) SHA1(b595d6a0f5d3c611ade1b83a94c3b909d2124dc4) )
	ROM_LOAD( "milliped.103", 0x5000, 0x1000, CRC(fb01baf2) SHA1(9c1d0bbc20bf25dd21761a311fd1ed80aa029241) )
	ROM_LOAD( "milliped.102", 0x6000, 0x1000, CRC(62e137e0) SHA1(9fe40db55ba1d20d4f11704f7f5df9ff75b87f30) )
	ROM_LOAD( "milliped.101", 0x7000, 0x1000, CRC(46752c7d) SHA1(ab06b1fd80271849946f90757b3837b617394929) )

	ROM_REGION( 0x1000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "milliped.107", 0x0000, 0x0800, CRC(68c3437a) SHA1(4c7ea33d9501456ee8f5a642da7d6c972f2bb90d) )
	ROM_LOAD( "milliped.106", 0x0800, 0x0800, CRC(f4468045) SHA1(602fcc7290f9f4eacb841c76665961ebf4307f80) )
ROM_END


ROM_START( warlords )
	ROM_REGION( 0x10000, REGION_CPU1, 0 )	/* 64k for code */
	ROM_LOAD( "037154.1m",    0x5000, 0x0800, CRC(18006c87) SHA1(6b4aab1b1710819d29f4bbc29269eb9c915626c0) )
	ROM_LOAD( "037153.1k",    0x5800, 0x0800, CRC(67758f4c) SHA1(b65ca677b54de7a8202838207d9a7bb0aed3e0f2) )
	ROM_LOAD( "037158.1j",    0x6000, 0x0800, CRC(1f043a86) SHA1(b1e271c0979d62202ae86c4b6860fb67bbef6400) )
	ROM_LOAD( "037157.1h",    0x6800, 0x0800, CRC(1a639100) SHA1(41ec333aee7192f8aeef49e5257f201f4db01cff) )
	ROM_LOAD( "037156.1e",    0x7000, 0x0800, CRC(534f34b4) SHA1(1680982ded17350c2ae10bb47f7eb8908bb10db2) )
	ROM_LOAD( "037155.1d",    0x7800, 0x0800, CRC(23b94210) SHA1(d74c1ca90caf15942805043b4ebe4ee077799da0) )

	ROM_REGION( 0x0800, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "037159.6e",    0x0000, 0x0800, CRC(ff979a08) SHA1(422053473e41e3e1f71eb28e40eedc78f22326b3) )

	ROM_REGION( 0x0100, REGION_PROMS, 0 )
	/* Only the first 0x80 bytes are used by the hardware. A7 is grounded. */
	/* Bytes 0x00-0x3f are used fore the color cocktail version. */
	/* Bytes 0x40-0x7f are for the upright version of the cabinet with a */
	/* mirror and painted background. */
	ROM_LOAD( "warlord.clr",  0x0000, 0x0100, CRC(a2c5c277) SHA1(f04de9fb6ee9619b4a4aae10c92b16b3123046cf) )
ROM_END


ROM_START( bullsdrt )
	ROM_REGION( 0x8000, REGION_CPU1, 0 )	/* 32k for code */
	ROM_LOAD( "27128.bin", 0x0000, 0x1000, CRC(2729f585) SHA1(6ffbfa5b62c497c3932ab71d0e3f407cae99cb59) )
	ROM_CONTINUE(          0x2000, 0x1000 )
	ROM_CONTINUE(          0x4000, 0x1000 )
	ROM_CONTINUE(          0x6000, 0x1000 )

	ROM_REGION( 0x4000, REGION_GFX1, ROMREGION_DISPOSE )
	ROM_LOAD( "2764_b.bin",   0x0000, 0x2000, CRC(49a19aba) SHA1(77869b7a7aae24dcbc4c7f1a3d4bcd26ea3f4fac) )
	ROM_LOAD( "2764_a.bin",   0x2000, 0x2000, CRC(361ff09d) SHA1(4b57417085bc9ee174196ca638dc7e6d3626f801) )

	ROM_REGION( 0x0200, REGION_PROMS, 0 ) /* unknown */
	ROM_LOAD( "82s147.bin",   0x0000, 0x0200, CRC(d841b7e0) SHA1(aab32645a613cd027aed98437db24704763cc147) )
ROM_END



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

static DRIVER_INIT( caterplr )
{
	memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x1000, 0x100f, 0, 0, caterplr_AY8910_w);
	memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0x1000, 0x100f, 0, 0, caterplr_AY8910_r);
	memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0x1780, 0x1780, 0, 0, caterplr_rand_r);
}


static DRIVER_INIT( magworm )
{
	memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x1001, 0x1001, 0, 0, AY8910_control_port_0_w);
	memory_install_write8_handler(0, ADDRESS_SPACE_PROGRAM, 0x1003, 0x1003, 0, 0, AY8910_write_port_0_w);
	memory_install_read8_handler(0, ADDRESS_SPACE_PROGRAM, 0x1003, 0x1003, 0, 0, AY8910_read_port_0_r);
}


static DRIVER_INIT( bullsdrt )
{
	dsw_select = 0;
}



/*************************************
 *
 *  Game drivers
 *
 *************************************/

GAME( 1980, centiped, 0,        centiped, centiped, 0,        ROT270, "Atari",   "Centipede (revision 3)", 0 )
GAME( 1980, centipd2, centiped, centiped, centiped, 0,        ROT270, "Atari",   "Centipede (revision 2)", 0 )
GAME( 1980, centtime, centiped, centiped, centtime, 0,        ROT270, "Atari",   "Centipede (1 player, timed)", 0 )
GAME( 1980, centipdb, centiped, centipdb, centiped, 0,        ROT270, "bootleg", "Centipede (bootleg)", 0 )
GAME( 1980, caterplr, centiped, caterplr, caterplr, caterplr, ROT270, "bootleg", "Caterpillar", 0 )
GAME( 1980, millpac,  centiped, centipdb, centiped, 0, 	      ROT270, "Valadon Automation", "Millpac", 0 )
GAME( 1980, magworm,  centiped, magworm,  magworm,  magworm,  ROT270, "bootleg", "Magic Worm (bootleg)", 0 )
GAME( 1982, milliped, 0,        milliped, milliped, 0,        ROT270, "Atari",   "Millipede", 0 )

GAME( 1980, warlords, 0,        warlords, warlords, 0,        ROT0,   "Atari",   "Warlords", 0 )

GAME( 1985, bullsdrt, 0,        bullsdrt, bullsdrt, bullsdrt, ROT270, "Shinkai Inc. (Magic Eletronics Inc. licence)", "Bulls Eye Darts", GAME_IMPERFECT_COLORS )
