class travrusa_state : public driver_device
{
public:
	travrusa_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_videoram(*this, "videoram"),
		m_spriteram(*this, "spriteram"),
		m_maincpu(*this, "maincpu"),
		m_gfxdecode(*this, "gfxdecode"),
		m_palette(*this, "palette") { }

	/* memory pointers */
	required_shared_ptr<UINT8> m_videoram;
	required_shared_ptr<UINT8> m_spriteram;

	/* video-related */
	tilemap_t*             m_bg_tilemap;
	int                  m_scrollx[2];
	DECLARE_WRITE8_MEMBER(travrusa_videoram_w);
	DECLARE_WRITE8_MEMBER(travrusa_scroll_x_low_w);
	DECLARE_WRITE8_MEMBER(travrusa_scroll_x_high_w);
	DECLARE_WRITE8_MEMBER(travrusa_flipscreen_w);
	DECLARE_READ8_MEMBER(shtridrb_port11_r);
	DECLARE_DRIVER_INIT(shtridra);
	DECLARE_DRIVER_INIT(motorace);
	DECLARE_DRIVER_INIT(shtridrb);
	TILE_GET_INFO_MEMBER(get_tile_info);
	virtual void machine_reset();
	virtual void video_start();
	DECLARE_PALETTE_INIT(travrusa);
	DECLARE_PALETTE_INIT(shtrider);
	UINT32 screen_update_travrusa(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	void set_scroll(  );
	void draw_sprites(bitmap_ind16 &bitmap,const rectangle &cliprect);
	required_device<cpu_device> m_maincpu;
	required_device<gfxdecode_device> m_gfxdecode;
	required_device<palette_device> m_palette;
};
