init vars for coverity (drivers/j)

src/mame/drivers/jackie.cpp

@@ -119,15 +119,15 @@ private:
 	output_finder<> m_led;
 	output_finder<6> m_lamps;
 
-	int m_exp_bank;
-	tilemap_t *m_fg_tilemap;
-	tilemap_t *m_reel_tilemap[3];
-	int m_irq_enable;
-	int m_nmi_enable;
-	int m_bg_enable;
-	int m_hopper;
-	uint8_t m_out[3];
-	uint16_t m_unk_reg[3][5];
+	int m_exp_bank = 0;
+	tilemap_t *m_fg_tilemap = nullptr;
+	tilemap_t *m_reel_tilemap[3]{};
+	int m_irq_enable = 0;
+	int m_nmi_enable = 0;
+	int m_bg_enable = 0;
+	int m_hopper = 0;
+	uint8_t m_out[3]{};
+	uint16_t m_unk_reg[3][5]{};
 };
 
 

src/mame/drivers/jackpool.cpp

@@ -55,7 +55,7 @@ private:
 	void jackpool_mem(address_map &map);
 
 	required_shared_ptr<uint16_t> m_vram;
-	uint8_t m_map_vreg;
+	uint8_t m_map_vreg = 0;
 	required_device<cpu_device> m_maincpu;
 	required_device<eeprom_serial_93cxx_device> m_eeprom;
 	required_device<gfxdecode_device> m_gfxdecode;

src/mame/drivers/jackpot.cpp

@@ -71,7 +71,7 @@ private:
 	required_device<gfxdecode_device> m_gfxdecode;
 	required_shared_ptr<uint8_t> m_tx_videoram;
 
-	tilemap_t *m_tx_tilemap;
+	tilemap_t *m_tx_tilemap = nullptr;
 
 	TILE_GET_INFO_MEMBER(get_tx_tile_info);
 	void tx_videoram_w(offs_t offset, uint8_t data);

src/mame/drivers/jalmah.cpp

@@ -263,7 +263,7 @@ private:
 	required_shared_ptr_array<uint16_t, 2> m_vreg;
 	required_device<gfxdecode_device> m_gfxdecode;
 
-	tilemap_t *m_layer[2];
+	tilemap_t *m_layer[2]{};
 
 	TILEMAP_MAPPER_MEMBER(range0_16x16);
 	TILEMAP_MAPPER_MEMBER(range3_8x8);

src/mame/drivers/jangou.cpp

@@ -74,17 +74,17 @@ protected:
 private:
 	/* sound-related */
 	// Jangou CVSD Sound
-	emu_timer    *m_cvsd_bit_timer;
-	uint8_t        m_cvsd_shiftreg;
-	int          m_cvsd_shift_cnt;
+	emu_timer    *m_cvsd_bit_timer = nullptr;
+	uint8_t        m_cvsd_shiftreg = 0;
+	int          m_cvsd_shift_cnt = 0;
 	// Jangou Lady ADPCM Sound
-	uint8_t        m_adpcm_byte;
-	int          m_msm5205_vclk_toggle;
+	uint8_t        m_adpcm_byte = 0;
+	int          m_msm5205_vclk_toggle = 0;
 
 	/* misc */
-	uint8_t        m_mux_data;
-	uint8_t        m_nsc_latch;
-	uint8_t        m_z80_latch;
+	uint8_t        m_mux_data = 0;
+	uint8_t        m_nsc_latch = 0;
+	uint8_t        m_z80_latch = 0;
 
 	std::unique_ptr<bitmap_ind16> m_tmp_bitmap;
 

src/mame/drivers/jclub2.cpp

@@ -269,8 +269,8 @@ private:
 
 	required_device<gfxdecode_device> m_gfxdecode;
 
-	tilemap_t *m_tmap;
-	tilemap_t *m_tmap2;
+	tilemap_t *m_tmap = nullptr;
+	tilemap_t *m_tmap2 = nullptr;
 };
 
 

src/mame/drivers/jensen.cpp

@@ -90,9 +90,9 @@ private:
 	required_device<i82357_device> m_isp;
 
 	// machine state
-	u8 m_hae;
-	u8 m_sysctl;
-	u8 m_spare;
+	u8 m_hae = 0;
+	u8 m_sysctl = 0;
+	u8 m_spare = 0;
 };
 
 void jensen_state::machine_start()

src/mame/drivers/jokrwild.cpp

@@ -104,7 +104,7 @@ protected:
 private:
 	required_shared_ptr<uint8_t> m_videoram;
 	required_shared_ptr<uint8_t> m_colorram;
-	tilemap_t *m_bg_tilemap;
+	tilemap_t *m_bg_tilemap = nullptr;
 	required_device<cpu_device> m_maincpu;
 	required_device<gfxdecode_device> m_gfxdecode;
 

src/mame/drivers/jollyjgr.cpp

@@ -154,15 +154,15 @@ private:
 	optional_shared_ptr<uint8_t> m_bulletram;
 
 	/* video-related */
-	tilemap_t  *m_bg_tilemap;
+	tilemap_t  *m_bg_tilemap = nullptr;
 
 	/* misc */
-	uint8_t      m_nmi_enable;
-	uint8_t      m_flip_x;
-	uint8_t      m_flip_y;
-	uint8_t      m_bitmap_disable;
-	uint8_t      m_tilemap_bank;
-	uint8_t      m_pri;
+	uint8_t      m_nmi_enable = 0;
+	uint8_t      m_flip_x = 0;
+	uint8_t      m_flip_y = 0;
+	uint8_t      m_bitmap_disable = 0;
+	uint8_t      m_tilemap_bank = 0;
+	uint8_t      m_pri = 0;
 	void jollyjgr_videoram_w(offs_t offset, uint8_t data);
 	void jollyjgr_attrram_w(offs_t offset, uint8_t data);
 	void jollyjgr_misc_w(uint8_t data);

src/mame/drivers/joystand.cpp

@@ -156,8 +156,8 @@ private:
 	required_shared_ptr<uint16_t> m_outputs;
 
 	// tilemaps
-	tilemap_t *m_bg1_tmap;
-	tilemap_t *m_bg2_tmap;
+	tilemap_t *m_bg1_tmap = nullptr;
+	tilemap_t *m_bg2_tmap = nullptr;
 	void bg1_w(offs_t offset, uint16_t data, uint16_t mem_mask = ~0);
 	void bg2_w(offs_t offset, uint16_t data, uint16_t mem_mask = ~0);
 	TILE_GET_INFO_MEMBER(get_bg1_tile_info);
@@ -170,7 +170,7 @@ private:
 	static const rgb_t BG15_TRANSPARENT;
 	void draw_bg15_tile(int x, int y, uint16_t code);
 	void draw_bg15_tilemap();
-	bool bg15_tiles_dirty;
+	bool bg15_tiles_dirty = false;
 
 	// eeprom
 	uint16_t eeprom_r();

src/mame/drivers/jpmmps.cpp

@@ -151,8 +151,8 @@ public:
 	void jpmmps(machine_config &config);
 
 private:
-	uint8_t m_sound_buffer;
-	uint8_t m_psg_latch;
+	uint8_t m_sound_buffer = 0;
+	uint8_t m_psg_latch = 0;
 	virtual void machine_reset() override;
 
 	void jpmmps_io_map(address_map &map);

src/mame/drivers/jubilee.cpp

@@ -234,12 +234,12 @@ private:
 	virtual void machine_start() override { m_lamps.resolve(); }
 	virtual void video_start() override;
 
-	uint8_t mux_sel;
-	uint8_t muxlamps;
+	uint8_t mux_sel = 0;
+	uint8_t muxlamps = 0;
 
 	required_shared_ptr<uint8_t> m_videoram;
 	required_shared_ptr<uint8_t> m_colorram;
-	tilemap_t *m_bg_tilemap;
+	tilemap_t *m_bg_tilemap = nullptr;
 	required_device<cpu_device> m_maincpu;
 	required_device<gfxdecode_device> m_gfxdecode;
 	output_finder<9> m_lamps;

src/mame/drivers/juno6.cpp

@@ -47,7 +47,7 @@ private:
 	required_device<cd4099_device> m_latch;
 	required_device<i8251_device> m_usart;
 
-	u8 m_db;
+	u8 m_db = 0;
 };
 
 void juno6_state::machine_start()

src/mame/drivers/junofrst.cpp

@@ -141,9 +141,9 @@ private:
 	required_device<filter_rc_device> m_filter_0_2;
 	required_region_ptr<uint8_t> m_blitrom;
 
-	uint8_t  m_blitterdata[4];
-	uint8_t  m_i8039_status;
-	uint8_t  m_last_irq;
+	uint8_t  m_blitterdata[4]{};
+	uint8_t  m_i8039_status = 0;
+	uint8_t  m_last_irq = 0;
 };
 
 

src/mame/includes/jpmimpct.h

@@ -46,9 +46,9 @@ private:
 	void tx_queue();
 
 	devcb_write_line m_rxd_handler;
-	int8_t m_sending;
-	uint8_t m_touch_data[3];
-	uint8_t m_sendpos;
+	int8_t m_sending = 0;
+	uint8_t m_touch_data[3]{};
+	uint8_t m_sendpos = 0;
 };
 
 DECLARE_DEVICE_TYPE(JPM_TOUCHSCREEN, jpmtouch_device)
@@ -104,7 +104,7 @@ protected:
 
 	void common_map(address_map &map);
 
-	int m_lamp_strobe;
+	int m_lamp_strobe = 0;
 
 	void set_duart_1_hack_ip(bool state);
 
@@ -147,16 +147,16 @@ private:
 	DECLARE_WRITE_LINE_MEMBER(duart_irq_handler);
 	void impact_non_video_map(address_map &map);
 
-	uint8_t m_Lamps[256];
-	int m_optic_pattern;
-	int m_payen;
-	int m_hopinhibit;
-	int m_slidesout;
-	int m_hopper[3];
-	int m_motor[3];
-	int m_volume_latch;
-	int m_global_volume;
-	uint16_t m_coinstate;
+	uint8_t m_Lamps[256]{};
+	int m_optic_pattern = 0;
+	int m_payen = 0;
+	int m_hopinhibit = 0;
+	int m_slidesout = 0;
+	int m_hopper[3]{};
+	int m_motor[3]{};
+	int m_volume_latch = 0;
+	int m_global_volume = 0;
+	uint16_t m_coinstate = 0;
 	required_device_array<timer_device, 6> m_cointimer;
 
 	required_device<i8255_device> m_ppi;
@@ -201,7 +201,7 @@ protected:
 	TMS340X0_TO_SHIFTREG_CB_MEMBER(to_shiftreg);
 	TMS340X0_FROM_SHIFTREG_CB_MEMBER(from_shiftreg);
 	TMS340X0_SCANLINE_RGB32_CB_MEMBER(scanline_update);
-	uint8_t m_tms_irq;
+	uint8_t m_tms_irq = 0;
 
 	virtual void update_irqs() override;