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

    Mermaid

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

class mermaid_state : public driver_device
{
public:
	mermaid_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag) { }

	/* memory pointers */
	UINT8 *    m_videoram;
	UINT8 *    m_colorram;
	UINT8 *    m_videoram2;
	UINT8 *    m_spriteram;
	UINT8 *    m_bg_scrollram;
	UINT8 *    m_fg_scrollram;
	UINT8 *    m_ay8910_enable;
	size_t     m_spriteram_size;

	/* video-related */
	tilemap_t *m_bg_tilemap;
	tilemap_t *m_fg_tilemap;
	bitmap_t* m_helper;
	bitmap_t* m_helper2;
	int m_coll_bit0;
	int m_coll_bit1;
	int m_coll_bit2;
	int m_coll_bit3;
	int m_coll_bit6;
	int m_rougien_gfxbank1;
	int m_rougien_gfxbank2;

	/* sound-related */
	UINT32   m_adpcm_pos;
	UINT32   m_adpcm_end;
	UINT8    m_adpcm_idle;
	int      m_adpcm_data;
	UINT8    m_adpcm_trigger;
	UINT8    m_adpcm_rom_sel;
	UINT8    m_adpcm_play_reg;

	/* devices */
	device_t *m_maincpu;
	device_t *m_ay1;
	device_t *m_ay2;
};



/*----------- defined in video/mermaid.c -----------*/

WRITE8_HANDLER( mermaid_videoram2_w );
WRITE8_HANDLER( mermaid_videoram_w );
WRITE8_HANDLER( mermaid_colorram_w );
WRITE8_HANDLER( mermaid_flip_screen_x_w );
WRITE8_HANDLER( mermaid_flip_screen_y_w );
WRITE8_HANDLER( mermaid_bg_scroll_w );
WRITE8_HANDLER( mermaid_fg_scroll_w );
WRITE8_HANDLER( rougien_gfxbankswitch1_w );
WRITE8_HANDLER( rougien_gfxbankswitch2_w );
READ8_HANDLER( mermaid_collision_r );

PALETTE_INIT( mermaid );
PALETTE_INIT( rougien );
VIDEO_START( mermaid );
SCREEN_UPDATE( mermaid );
SCREEN_EOF( mermaid );