zerowing.c

这个是延伸mame的在wince平台下的游戏模拟器的代码

/***************************************************************************
 Zero Wing (ToaPlan)
***************************************************************************/

#include "driver.h"
#include "vidhrdw/generic.h"
#include "M68000/m68000.h"
#include "Z80/z80.h"

/* change this to malloc */

int vblank_r(int offset);
int framedone_r(int offset);
void framedone_w(int offset, int data);

void video_ofs_w(int offset, int data);
void video_ofs3_w(int offset, int data);
int video_ofs_r(int offset);
int video_ofs3_r(int offset);

int scrollregs_r(int offset);
void scrollregs_w(int offset, int data);

void zerowing_videoram1_w(int offset, int data);
void zerowing_videoram2_w(int offset, int data);
void zerowing_videoram3_w(int offset, int data);

int zerowing_videoram1_r(int offset);
int zerowing_videoram2_r(int offset);
int zerowing_videoram3_r(int offset);

void zerowing_colorram1_w(int offset, int data);
int zerowing_colorram1_r(int offset);
void zerowing_colorram2_w(int offset, int data);
int zerowing_colorram2_r(int offset);

void zerowing_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
void vimana_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh);
void zerowing_vh_stop(void);
int zerowing_vh_start(void);

static unsigned char *ram;
int unk;
int int_enable;
int credits;
int latch;

extern int vblank ;
extern int framedone  ;

extern int video_ofs  ;
extern int video_ofs3 ;

unsigned char *shared_ram;

extern unsigned char *zerowing_colorram1;
extern unsigned char *zerowing_colorram2;
extern int colorram1_size;
extern int colorram2_size;

static int zerowing_interrupt(void)
{
	if ( int_enable )
		return MC68000_IRQ_4;
	return MC68000_INT_NONE;
}

static int unk_r(int offset)
{
	return unk ^= 1;
}

static int vm_input_port_4_r(int offset)
{
	int data, p ;

	p = input_port_4_r(0) ;

	latch ^= p ;
	data = (latch & p ) ;

	/* simulate the mcu keeping track of credits */
	/* latch is so is doesn't add more than one */
	/* credit per keypress */

	if ( data & 0x18 )
		{
		credits++ ;
		}

	latch = p ;

	return p ;
}

static int vm_mcu_r(int offset)
{
	int data = 0 ;
	switch ( offset >> 1 )
		{
		case 0:
			data = 0xff ;
			break ;
		case 1:
			data = 0 ;
			break ;
		case 2:
			data = credits ;
			break ;
		}
	return data ;
}

static void vm_mcu_w(int offset, int data)
{
	switch ( offset >> 1 )
		{
		case 0:
			break ;
		case 1:
			break ;
		case 2:
			credits = data ;
			break ;
		}
}

static int shared_r(int offset)
{
	return shared_ram[offset>>1] ;
}

static void shared_w(int offset, int data)
{
	shared_ram[offset>>1] = data ;
}

static void int_enable_w(int offset, int data )
{
	int_enable = data ;
}

static void toaplan_init_machine (void)
{
	unk = 0;
	int_enable = 0;
	credits = 0;
	latch = 0;
}

/* Sound Routines */

static void zw_opl_w(int offset, int data)
{
	if ( (offset & 0xfe) == 0xa8 )
		{
		if ( offset == 0xa8 )
			{
			YM3812_control_port_0_w( 0, data ) ;
			}
		else
			{
			YM3812_write_port_0_w(0, data);
			}
		}
}

static void hf_opl_w(int offset, int data)
{
	if ( (offset & 0xfe) == 0x70 )
		{
		if ( offset == 0x70 )
			{
			YM3812_control_port_0_w( 0, data ) ;
			}
		else
			{
			YM3812_write_port_0_w(0, data);
			}
		}
}

static struct MemoryReadAddress vm_readmem[] =
{
	{ 0x000000, 0x03ffff, MRA_ROM },
	{ 0x0c0000, 0x0c0001, vblank_r },
	{ 0x0c0002, 0x0c0003, video_ofs_r },
	{ 0x0c0004, 0x0c0005, zerowing_videoram1_r },		/* sprites info */
	{ 0x0c0006, 0x0c0007, zerowing_videoram2_r },	/* sprite size ? */
	{ 0x400000, 0x400001, vblank_r },
	{ 0x404000, 0x4047ff, zerowing_colorram1_r },
	{ 0x406000, 0x4067ff, zerowing_colorram2_r },
	{ 0x440000, 0x440005, vm_mcu_r },
	{ 0x440006, 0x440007, input_port_2_r },
	{ 0x440008, 0x440009, vm_input_port_4_r },
	{ 0x44000a, 0x44000b, input_port_0_r },
	{ 0x44000c, 0x44000d, input_port_1_r },
	{ 0x44000e, 0x44000f, input_port_3_r },
	{ 0x440010, 0x440011, input_port_5_r },
	{ 0x480000, 0x480147, MRA_BANK1 },
	{ 0x480148, 0x487fff, MRA_BANK2 },
	{ 0x4c0000, 0x4c0001, unk_r },
	{ 0x4c0002, 0x4c0003, video_ofs3_r },
	{ 0x4c0004, 0x4c0007, zerowing_videoram3_r },	/* tile layers */
	{ 0x4c0010, 0x4c001f, scrollregs_r },
	{ -1 }  /* end of table */
};

static struct MemoryWriteAddress vm_writemem[] =
{
	{ 0x000000, 0x03ffff, MWA_ROM },
	{ 0x0c0002, 0x0c0003, video_ofs_w },
	{ 0x0c0004, 0x0c0005, zerowing_videoram1_w },		/* sprites info */
	{ 0x0c0006, 0x0c0007, zerowing_videoram2_w },	/* sprite size ? */
	{ 0x400000, 0x400001, int_enable_w },
	{ 0x400002, 0x400003, MWA_NOP }, /* IRQACK? */
	{ 0x404000, 0x4047ff, zerowing_colorram1_w, &zerowing_colorram1, &colorram1_size },
	{ 0x406000, 0x4067ff, zerowing_colorram2_w, &zerowing_colorram2, &colorram2_size },
	{ 0x440000, 0x440005, vm_mcu_w },
	{ 0x480000, 0x480147, MWA_BANK1 },
	{ 0x480148, 0x487fff, MWA_BANK2 },
	{ 0x4c0002, 0x4c0003, video_ofs3_w },
	{ 0x4c0004, 0x4c0007, zerowing_videoram3_w },	/* tile layers */
	{ 0x4c0010, 0x4c001f, scrollregs_w },
	{ -1 }  /* end of table */
};

static struct MemoryReadAddress zw_readmem[] =
{
	{ 0x000000, 0x07ffff, MRA_ROM },
	{ 0x080000, 0x08176d, MRA_BANK1 },
	{ 0x08176e, 0x08176f, framedone_r },
	{ 0x081770, 0x087fff, MRA_BANK2 },
	{ 0x400000, 0x400005, unk_r },
	{ 0x404000, 0x4047ff, zerowing_colorram1_r },
	{ 0x406000, 0x4067ff, zerowing_colorram2_r },
	{ 0x440000, 0x440fff, shared_r },
	{ 0x480002, 0x480003, video_ofs3_r },
	{ 0x480004, 0x480007, zerowing_videoram3_r },	/* tile layers */
	{ 0x480010, 0x48001f, scrollregs_r },
	{ 0x4c0000, 0x4c0001, vblank_r },
	{ 0x4c0002, 0x4c0003, video_ofs_r },
	{ 0x4c0004, 0x4c0005, zerowing_videoram1_r },	/* sprites info */
	{ 0x4c0006, 0x4c0007, zerowing_videoram2_r },	/* sprite size ? */
	{ -1 }  /* end of table */
};

static struct MemoryWriteAddress zw_writemem[] =
{
	{ 0x000000, 0x07ffff, MWA_ROM },
	{ 0x080000, 0x08176d, MWA_BANK1 },
	{ 0x08176e, 0x08176f, framedone_w },
	{ 0x081770, 0x087fff, MWA_BANK2 },
	{ 0x400002, 0x400003, int_enable_w },
	{ 0x404000, 0x4047ff, zerowing_colorram1_w, &zerowing_colorram1, &colorram1_size },
	{ 0x406000, 0x4067ff, zerowing_colorram2_w, &zerowing_colorram2, &colorram2_size },
	{ 0x440000, 0x440fff, shared_w, &shared_ram },
	{ 0x480002, 0x480003, video_ofs3_w },
	{ 0x480004, 0x480007, zerowing_videoram3_w },	/* tile layers */
	{ 0x480010, 0x48001f, scrollregs_w },
	{ 0x4c0002, 0x4c0003, video_ofs_w },
	{ 0x4c0004, 0x4c0005, zerowing_videoram1_w },	/* sprites info */
	{ 0x4c0006, 0x4c0007, zerowing_videoram2_w },	/* sprite size ? */
	{ -1 }  /* end of table */
};

static struct MemoryReadAddress hf_readmem[] =
{
	{ 0x000000, 0x03ffff, MRA_ROM },
	{ 0x040000, 0x0422f1, MRA_BANK1 },
	{ 0x0422f2, 0x0422f3, framedone_r },
	{ 0x0422f4, 0x047fff, MRA_BANK2 },
	{ 0x084000, 0x0847ff, zerowing_colorram1_r },
	{ 0x086000, 0x0867ff, zerowing_colorram2_r },
	{ 0x0c0000, 0x0c0fff, shared_r },
	{ 0x100002, 0x100003, video_ofs3_r },
	{ 0x100004, 0x100007, zerowing_videoram3_r },	/* tile layers */
	{ 0x100010, 0x10001f, scrollregs_r },
	{ 0x140000, 0x140001, vblank_r },
	{ 0x140002, 0x140003, video_ofs_r },
	{ 0x140004, 0x140005, zerowing_videoram1_r },	/* sprites info */
	{ 0x140006, 0x140007, zerowing_videoram2_r },	/* sprite size ? */
	{ -1 }  /* end of table */
};

static struct MemoryWriteAddress hf_writemem[] =
{
	{ 0x000000, 0x03ffff, MWA_ROM },
	{ 0x040000, 0x0422f1, MWA_BANK1 },
	{ 0x0422f2, 0x0422f3, framedone_w },
	{ 0x0422f4, 0x047fff, MWA_BANK2 },
	{ 0x080002, 0x080003, int_enable_w },
	{ 0x084000, 0x0847ff, zerowing_colorram1_w, &zerowing_colorram1, &colorram1_size },
	{ 0x086000, 0x0867ff, zerowing_colorram2_w, &zerowing_colorram2, &colorram2_size },
	{ 0x0c0000, 0x0c0fff, shared_w, &shared_ram },
	{ 0x100002, 0x100003, video_ofs3_w },
	{ 0x100004, 0x100007, zerowing_videoram3_w },	/* tile layers */
	{ 0x100010, 0x10001f, scrollregs_w },
	{ 0x140002, 0x140003, video_ofs_w },
	{ 0x140004, 0x140005, zerowing_videoram1_w },	/* sprites info */
	{ 0x140006, 0x140007, zerowing_videoram2_w },	/* sprite size ? */
	{ -1 }  /* end of table */
};

static struct MemoryReadAddress sound_readmem[] =
{
	{ 0x0000, 0x7fff, MRA_ROM },
	{ 0x8000, 0xffff, MRA_RAM },
	{ -1 }  /* end of table */
};

static struct MemoryWriteAddress sound_writemem[] =
{
	{ 0x0000, 0x7fff, MWA_ROM },
	{ 0x8000, 0xffff, MWA_RAM, &shared_ram },
	{ -1 }  /* end of table */
};

static struct IOReadPort zw_sound_readport[] =
{
	{ 0x00, 0x00, input_port_0_r }, /* player 1 */
	{ 0x08, 0x08, input_port_1_r }, /* player 2 */
	{ 0x20, 0x20, input_port_2_r }, /* DSW1 */
	{ 0x28, 0x28, input_port_3_r }, /* DSW2 */
	{ 0x80, 0x80, input_port_4_r }, /* DSWX */
	{ 0x88, 0x88, input_port_5_r }, /* DSW3 */
	{ 0xa8, 0xa8, YM3812_status_port_0_r },
	{ -1 }	/* end of table */
};

static struct IOWritePort zw_sound_writeport[] =
{
	{ 0x00, 0xff, zw_opl_w },
	{ -1 }	/* end of table */
};

static struct IOReadPort hf_sound_readport[] =
{
	{ 0x00, 0x00, input_port_2_r }, /* DSW1 */
	{ 0x10, 0x10, input_port_3_r }, /* DSW2 */
	{ 0x40, 0x40, input_port_0_r }, /* player 1 */
	{ 0x50, 0x50, input_port_1_r }, /* player 2 */
	{ 0x60, 0x60, input_port_4_r }, /* DSWX */
	{ 0x20, 0x20, input_port_5_r }, /* DSW3 */
	{ 0x70, 0x70, YM3812_status_port_0_r },
	{ -1 }	/* end of table */
};

static struct IOWritePort hf_sound_writeport[] =
{
	{ 0x00, 0xff, hf_opl_w },
	{ -1 }	/* end of table */
};



INPUT_PORTS_START( zerowing_input_ports )
	PORT_START      /* PLAYER 1 */
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP | IPF_PLAYER1 | IPF_8WAY )
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN | IPF_PLAYER1 | IPF_8WAY )
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT | IPF_PLAYER1 | IPF_8WAY )
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT | IPF_PLAYER1 | IPF_8WAY )
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_BUTTON1 | IPF_PLAYER1 )
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_BUTTON2 | IPF_PLAYER1 )
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNKNOWN )

	PORT_START      /* PLAYER 2 */
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP | IPF_PLAYER2 | IPF_8WAY )
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN | IPF_PLAYER2 | IPF_8WAY )
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT | IPF_PLAYER2 | IPF_8WAY )
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT | IPF_PLAYER2 | IPF_8WAY )
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_BUTTON1 | IPF_PLAYER2 )
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_BUTTON2 | IPF_PLAYER2 )
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNKNOWN )

	PORT_START	/* DSWA */
	PORT_DIPNAME( 0x01, 0x01, "Cabinet", IP_KEY_NONE )
	PORT_DIPSETTING(    0x01, "Upright" )
	PORT_DIPSETTING(    0x00, "Cocktail" )
	PORT_DIPNAME( 0x02, 0x00, "Flip Screen", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "Off" )
	PORT_DIPSETTING(    0x02, "On" )
	PORT_BITX(    0x04, 0x00, IPT_DIPSWITCH_NAME | IPF_TOGGLE, "Service Mode", OSD_KEY_F2, IP_JOY_NONE, 0 )
	PORT_DIPSETTING(    0x00, "Off" )
	PORT_DIPSETTING(    0x04, "On" )
	PORT_DIPNAME( 0x08, 0x00, "Demo Sounds", IP_KEY_NONE )
	PORT_DIPSETTING(    0x08, "Off" )
	PORT_DIPSETTING(    0x00, "On" )
	PORT_DIPNAME( 0x30, 0x00, "Coin A", IP_KEY_NONE )
	PORT_DIPSETTING(    0x20, "2 Coins/1 Credit" )
	PORT_DIPSETTING(    0x00, "1 Coin/1 Credit" )
	PORT_DIPSETTING(    0x30, "2 Coins/3 Credit" )
	PORT_DIPSETTING(    0x10, "1 Coins/2 Credit" )
	PORT_DIPNAME( 0xc0, 0x00, "Coin B", IP_KEY_NONE )
	PORT_DIPSETTING(    0x80, "2 Coins/1 Credit" )
	PORT_DIPSETTING(    0x00, "1 Coins/1 Credit" )
	PORT_DIPSETTING(    0xc0, "2 Coins/3 Credit" )
	PORT_DIPSETTING(    0x40, "1 Coins/2 Credit" )

	PORT_START	/* DSWB */
	PORT_DIPNAME( 0x03, 0x00, "Difficulty", IP_KEY_NONE )
	PORT_DIPSETTING(    0x01, "Easy" )
	PORT_DIPSETTING(    0x00, "Medium" )
	PORT_DIPSETTING(    0x02, "Hard" )
	PORT_DIPSETTING(    0x03, "Hardest" )
	PORT_DIPNAME( 0x0c, 0x00, "Bonus Life", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "200K and 500K" )
	PORT_DIPSETTING(    0x04, "500K and 1M" )
	PORT_DIPSETTING(    0x08, "500K" )
	PORT_DIPSETTING(    0x0c, "None" )
	PORT_DIPNAME( 0x30, 0x00, "Lives", IP_KEY_NONE )
	PORT_DIPSETTING(    0x30, "2" )
	PORT_DIPSETTING(    0x00, "3" )
	PORT_DIPSETTING(    0x20, "4" )
	PORT_DIPSETTING(    0x10, "5" )
	PORT_BITX(    0x40, 0x00, IPT_DIPSWITCH_NAME | IPF_CHEAT, "Invulnerability", IP_KEY_NONE, IP_JOY_NONE, 0 )
	PORT_DIPSETTING(    0x00, "Off" )
	PORT_DIPSETTING(    0x40, "On" )
	PORT_DIPNAME( 0x80, 0x00, "Allow Continue", IP_KEY_NONE )
	PORT_DIPSETTING(    0x80, "No" )
	PORT_DIPSETTING(    0x00, "Yes" )

	PORT_START      /* DSWX */
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_COIN3 ) /* Service switch */
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_TILT )
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_COIN1 )
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_COIN2 )
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_START1 )
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_START2 )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNKNOWN )

	PORT_START	/* DSW3 */
	PORT_DIPNAME( 0x03, 0x03, "Territory", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "Japan" )
	PORT_DIPSETTING(    0x01, "US" )
	PORT_DIPSETTING(    0x03, "Europe" )
	PORT_DIPNAME( 0x04, 0x00, "Unknown", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "Off" )
	PORT_DIPSETTING(    0x04, "On" )
	PORT_DIPNAME( 0x08, 0x00, "Unknown", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "Off" )
	PORT_DIPSETTING(    0x08, "On" )
	PORT_BIT( 0xf0, IP_ACTIVE_HIGH, IPT_UNKNOWN )
INPUT_PORTS_END

INPUT_PORTS_START( hellfire_input_ports )
	PORT_START      /* PLAYER 1 */
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP | IPF_PLAYER1 | IPF_8WAY )
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN | IPF_PLAYER1 | IPF_8WAY )
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT | IPF_PLAYER1 | IPF_8WAY )
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT | IPF_PLAYER1 | IPF_8WAY )
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_BUTTON1 | IPF_PLAYER1 )
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_BUTTON2 | IPF_PLAYER1 )
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNKNOWN )

	PORT_START      /* PLAYER 2 */
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP | IPF_PLAYER2 | IPF_8WAY )
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN | IPF_PLAYER2 | IPF_8WAY )
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT | IPF_PLAYER2 | IPF_8WAY )
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT | IPF_PLAYER2 | IPF_8WAY )
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_BUTTON1 | IPF_PLAYER2 )
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_BUTTON2 | IPF_PLAYER2 )
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNKNOWN )
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNKNOWN )

	PORT_START	/* DSWA */
	PORT_DIPNAME( 0x01, 0x00, "Unknown", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "Off" )
	PORT_DIPSETTING(    0x01, "On" )
	PORT_DIPNAME( 0x02, 0x00, "Flip Screen", IP_KEY_NONE )
	PORT_DIPSETTING(    0x00, "Off" )
	PORT_DIPSETTING(    0x02, "On" )
	PORT_BITX(    0x04, 0x00, IPT_DIPSWITCH_NAME | IPF_TOGGLE, "Service Mode", OSD_KEY_F2, IP_JOY_NONE, 0 )
	PORT_DIPSETTING(    0x00, "Off" )
	PORT_DIPSETTING(    0x04, "On" )
	PORT_DIPNAME( 0x08, 0x00, "Demo Sounds", IP_KEY_NONE )
	PORT_DIPSETTING(    0x08, "Off" )
	PORT_DIPSETTING(    0x00, "On" )
	PORT_DIPNAME( 0x30, 0x00, "Coin A", IP_KEY_NONE )
	PORT_DIPSETTING(    0x20, "2 Coins/1 Credit" )
	PORT_DIPSETTING(    0x00, "1 Coin/1 Credit" )
	PORT_DIPSETTING(    0x30, "2 Coins/3 Credit" )
	PORT_DIPSETTING(    0x10, "1 Coins/2 Credit" )
	PORT_DIPNAME( 0xc0, 0x00, "Coin B", IP_KEY_NONE )
	PORT_DIPSETTING(    0x80, "2 Coins/1 Credit" )
	PORT_DIPSETTING(    0x00, "1 Coins/1 Credit" )
	PORT_DIPSETTING(    0xc0, "2 Coins/3 Credit" )
	PORT_DIPSETTING(    0x40, "1 Coins/2 Credit" )

	PORT_START	/* DSWB */
	PORT_DIPNAME( 0x03, 0x00, "Difficulty", IP_KEY_NONE )
	PORT_DIPSETTING(    0x01, "Easy" )