init vars for coverity (drivers/n,o)

src/mame/drivers/nakajies.cpp

@@ -330,24 +330,24 @@ private:
 	required_device<cpu_device> m_maincpu;
 
 	/* IRQ handling */
-	uint8_t   m_irq_enabled;
+	uint8_t   m_irq_enabled = 0;
-	uint8_t   m_irq_active;
+	uint8_t   m_irq_active = 0;
 
-	uint8_t   m_lcd_memory_start;
+	uint8_t   m_lcd_memory_start = 0;
 
-	uint8_t   m_matrix;
+	uint8_t   m_matrix = 0;
 
 	/* ROM */
-	uint8_t   *m_rom_base;
+	uint8_t   *m_rom_base = nullptr;
-	uint32_t  m_rom_size;
+	uint32_t  m_rom_size = 0;
 
 	/* RAM */
 	std::unique_ptr<uint8_t[]> m_ram_base;
-	uint32_t  m_ram_size;
+	uint32_t  m_ram_size = 0;
 
 	/* Banking */
-	uint8_t   m_bank[8];
+	uint8_t   m_bank[8]{};
-	uint8_t   *m_bank_base[8];
+	uint8_t   *m_bank_base[8]{};
 };
 
 

src/mame/drivers/namcos10.cpp

@@ -485,7 +485,7 @@ private:
 	uint16_t sprot_r();
 	void sprot_w(uint16_t data);
 
-	uint8_t *nand_base;
+	uint8_t *nand_base = nullptr;
 	void nand_copy( uint32_t *dst, uint32_t address, int len );
 
 	void namcos10_map(address_map &map);
@@ -499,16 +499,16 @@ private:
 		I2CP_RECIEVE_ACK_0
 	};
 
-	uint32_t bank_base;
+	uint32_t bank_base = 0;
-	uint32_t nand_address;
+	uint32_t nand_address = 0;
-	uint16_t block[0x1ff];
+	uint16_t block[0x1ff]{};
 
-	uint16_t i2c_host_clock, i2c_host_data, i2c_dev_clock, i2c_dev_data, i2c_prev_clock, i2c_prev_data;
+	uint16_t i2c_host_clock = 0, i2c_host_data = 0, i2c_dev_clock = 0, i2c_dev_data = 0, i2c_prev_clock = 0, i2c_prev_data = 0;
-	int i2cp_mode;
+	int i2cp_mode = 0;
-	uint8_t i2c_byte;
+	uint8_t i2c_byte = 0;
-	int i2c_bit;
+	int i2c_bit = 0;
 
-	int sprot_bit, sprot_byte;
+	int sprot_bit = 0, sprot_byte = 0;
 	uint16_t nand_read( uint32_t address );
 	uint16_t nand_read2( uint32_t address );
 

src/mame/drivers/namcos23.cpp

@@ -1339,7 +1339,7 @@ public:
 
 private:
 	namcos23_state& m_state;
-	float* m_zBuffer;
+	float* m_zBuffer = nullptr;
 };
 
 typedef namcos23_renderer::vertex_t poly_vertex;

src/mame/drivers/ncd68k.cpp

@@ -124,9 +124,9 @@ protected:
 	required_device<screen_device> m_screen;
 
 //private:
-	u8 m_portc, m_to_68k, m_from_68k;
+	u8 m_portc = 0, m_to_68k = 0, m_from_68k = 0;
-	u8 m_porta_in, m_porta_out;
+	u8 m_porta_in = 0, m_porta_out = 0;
-	u8 m_portb_out;
+	u8 m_portb_out = 0;
 };
 
 class ncd16_state : public ncd68k_state

src/mame/drivers/neogeo.cpp

@@ -592,8 +592,8 @@ protected:
 	virtual void io_control_w(offs_t offset, uint8_t data) override;
 
 private:
-	uint8_t m_output_data;
+	uint8_t m_output_data = 0;
-	uint8_t m_output_latch;
+	uint8_t m_output_latch = 0;
 };
 
 
@@ -688,8 +688,8 @@ protected:
 private:
 	output_finder<4> m_digits;
 
-	uint8_t m_led1_value;
+	uint8_t m_led1_value = 0;
-	uint8_t m_led2_value;
+	uint8_t m_led2_value = 0;
 };
 
 
@@ -716,7 +716,7 @@ protected:
 private:
 	output_finder<6> m_lamps;
 
-	uint8_t m_el_value;
+	uint8_t m_el_value = 0;
 };
 
 

src/mame/drivers/neogeocd.cpp

@@ -80,10 +80,10 @@ public:
 	DECLARE_INPUT_CHANGED_MEMBER(aes_jp1);
 
 	// neoCD
-	uint8_t m_system_region;
+	uint8_t m_system_region = 0;
-	int32_t m_active_transfer_area;
+	int32_t m_active_transfer_area = 0;
-	int32_t m_sprite_transfer_bank;
+	int32_t m_sprite_transfer_bank = 0;
-	int32_t m_adpcm_transfer_bank;
+	int32_t m_adpcm_transfer_bank = 0;
 	int32_t m_dma_address1;
 	int32_t m_dma_address2;
 	int32_t m_dma_value1;
@@ -109,9 +109,9 @@ public:
 	void interrupt_callback_type2(void);
 	void interrupt_callback_type3(void);
 
-	uint8_t m_transfer_write_enable;
+	uint8_t m_transfer_write_enable = 0;
 
-	bool prohibit_cdc_irq; // hack?
+	bool prohibit_cdc_irq = false; // hack?
 
 	uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
 

src/mame/drivers/neoprint.cpp

@@ -100,9 +100,9 @@ private:
 	required_device<generic_latch_8_device> m_soundlatch;
 	optional_shared_ptr<uint16_t> m_generic_paletteram_16;
 
-	uint8_t m_audio_result;
+	uint8_t m_audio_result = 0;
-	uint8_t m_bank_val;
+	uint8_t m_bank_val = 0;
-	uint8_t m_vblank;
+	uint8_t m_vblank = 0;
 	void draw_layer(bitmap_ind16 &bitmap,const rectangle &cliprect,int layer,int data_shift);
 	void audio_cpu_assert_nmi();
 };

src/mame/drivers/nes_clone.cpp

@@ -116,7 +116,7 @@ private:
 	virtual void machine_reset() override;
 	uint8_t rom_r(offs_t offset);
 	void bank_w(uint8_t data);
-	uint8_t m_rombase;
+	uint8_t m_rombase = 0;
 };
 
 class nes_clone_vtvppong_state : public nes_clone_state
@@ -150,7 +150,7 @@ private:
 	virtual void machine_reset() override;
 	uint8_t rom_r(offs_t offset);
 	void bank_w(uint8_t data);
-	uint8_t m_rombase;
+	uint8_t m_rombase = 0;
 };
 
 class nes_clone_vtvsocr_state : public nes_clone_state
@@ -192,7 +192,7 @@ protected:
 
 private:
 	// configured at startup
-	uint8_t m_maxchrbank;
+	uint8_t m_maxchrbank = 0;
 
 	void nes_clone_afbm7800_map(address_map &map);
 
@@ -215,20 +215,20 @@ private:
 	uint8_t vram_r(offs_t offset);
 	void vram_w(offs_t offset, uint8_t data);
 
-	uint8_t m_banksel;
+	uint8_t m_banksel = 0;
 	uint8_t m_bankregs[8];
 	uint8_t m_extraregs[4];
 
 	void update_banks();
 	void mmc3_scanline_cb(int scanline, int vblank, int blanked);
-	int16_t m_mmc3_scanline_counter;
+	int16_t m_mmc3_scanline_counter = 0;
-	uint8_t m_mmc3_scanline_latch;
+	uint8_t m_mmc3_scanline_latch = 0;
-	uint8_t m_mmc3_irq_enable;
+	uint8_t m_mmc3_irq_enable = 0;
 
 	std::vector<u8> m_vram;
 
-	uint8_t m_ntmirror;
+	uint8_t m_ntmirror = 0;
-	uint8_t m_ramprot;
+	uint8_t m_ramprot = 0;
 
 	void update_nt_mirroring();
 	std::vector<u8> m_nt_ram;

src/mame/drivers/news_38xx.cpp

@@ -140,13 +140,13 @@ protected:
 
 	std::unique_ptr<u16[]> m_net_ram;
 
-	emu_timer *m_timer;
+	emu_timer *m_timer = nullptr;
 
-	u8 m_intst;
+	u8 m_intst = 0;
-	u8 m_inten;
+	u8 m_inten = 0;
 
-	bool m_int_state[3];
+	bool m_int_state[3]{};
-	bool m_scc_irq_state;
+	bool m_scc_irq_state = 0;
 };
 
 void news_38xx_state::machine_start()

src/mame/drivers/news_r3k.cpp

@@ -148,15 +148,15 @@ protected:
 
 	std::unique_ptr<u16[]> m_net_ram;
 
-	emu_timer *m_itimer;
+	emu_timer *m_itimer = nullptr;
 
-	u16 m_inten;
+	u16 m_inten = 0;
-	u16 m_intst;
+	u16 m_intst = 0;
-	u8 m_debug;
+	u8 m_debug = 0;
 
-	bool m_int_state[4];
+	bool m_int_state[4]{};
-	bool m_lcd_enable;
+	bool m_lcd_enable = false;
-	bool m_lcd_dim;
+	bool m_lcd_dim = false;
 };
 
 void news_r3k_state::machine_start()

src/mame/drivers/newton.cpp

@@ -52,7 +52,7 @@ protected:
 	required_device<arm7_cpu_device> m_maincpu;
 	required_device<ram_device> m_ram;
 
-	uint32_t m_ram_size;
+	uint32_t m_ram_size = 0;
 };
 
 uint32_t newton_state::tick_count_r()

src/mame/drivers/nexus3d.cpp

@@ -63,7 +63,7 @@ private:
 	DECLARE_WRITE_LINE_MEMBER(screen_vblank);
 	void nexus3d_map(address_map &map);
 
-	uint32_t m_intpend, m_intmask, m_intlevel;
+	uint32_t m_intpend = 0, m_intmask = 0, m_intlevel = 0;
 	uint32_t int_pending_r();
 	void int_ack_w(uint32_t data);
 	uint32_t int_level_r();
@@ -80,12 +80,12 @@ private:
 	void timer_status_w(offs_t offset, uint32_t data, uint32_t mem_mask = ~0);
 	uint32_t timer_count_r();
 	void timer_count_w(offs_t offset, uint32_t data, uint32_t mem_mask = ~0);
-	uint32_t m_timer_status;
+	uint32_t m_timer_status = 0;
-	uint32_t m_timer_count;
+	uint32_t m_timer_count = 0;
-	emu_timer  *m_timer;
+	emu_timer  *m_timer = nullptr;
 	TIMER_CALLBACK_MEMBER(timercb);
-	bool m_timer_irq;
+	bool m_timer_irq = false;
-	bool m_timer_result;
+	bool m_timer_result = false;
 
 	uint32_t crtc_vblank_r();
 };

src/mame/drivers/nibble.cpp

@@ -79,7 +79,7 @@ protected:
 
 private:
 	required_shared_ptr<uint8_t> m_videoram;
-	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/nichild.cpp

@@ -71,7 +71,7 @@ private:
 	required_device<tmpz84c011_device> m_maincpu;
 	required_device<v9938_device> m_v9938;
 	required_region_ptr<uint8_t> m_gfxrom;
-	uint32_t m_gfx_bank;
+	uint32_t m_gfx_bank = 0;
 };
 
 

src/mame/drivers/nightmare.cpp

@@ -260,7 +260,7 @@ protected:
 	required_device<sda2006_device> m_eeprom;
 
 	// cpu state
-	int m_reset;
+	int m_reset = 0;
 };
 
 void nightmare_state::device_timer(emu_timer &timer, device_timer_id id, int param)

src/mame/drivers/nmg5.cpp

@@ -273,14 +273,14 @@ private:
 	required_shared_ptr_array<uint16_t, 2> m_vram;
 
 	/* video-related */
-	tilemap_t  *m_tilemap[2];
+	tilemap_t  *m_tilemap[2]{};
 	std::unique_ptr<bitmap_ind16> m_pixmap;
 
 	/* misc */
-	uint8_t m_prot_val;
+	uint8_t m_prot_val = 0;
-	uint8_t m_input_data;
+	uint8_t m_input_data = 0;
-	uint8_t m_priority_reg;
+	uint8_t m_priority_reg = 0;
-	uint8_t m_gfx_bank;
+	uint8_t m_gfx_bank = 0;
 
 	/* devices */
 	required_device<cpu_device> m_maincpu;

src/mame/drivers/notetaker.cpp

@@ -197,35 +197,35 @@ private:
 	uint8_t m_TabletYOn;
 	uint8_t m_TabletXOn;
 	uint8_t m_FrSel2;
-	uint8_t m_FrSel1;
+	uint8_t m_FrSel1 = 0;
-	uint8_t m_FrSel0;
+	uint8_t m_FrSel0 = 0;
-	uint8_t m_SHConB;
+	uint8_t m_SHConB = 0;
-	uint8_t m_SHConA;
+	uint8_t m_SHConA = 0;
-	uint8_t m_SetSH;
+	uint8_t m_SetSH = 0;
 	// DiskReg
-	uint8_t m_ADCSpd0;
+	uint8_t m_ADCSpd0 = 0;
-	uint8_t m_ADCSpd1;
+	uint8_t m_ADCSpd1 = 0;
-	uint8_t m_StopWordClock_q;
+	uint8_t m_StopWordClock_q = 0;
-	uint8_t m_ClrDiskCont_q;
+	uint8_t m_ClrDiskCont_q = 0;
-	uint8_t m_ProgBitClk1;
+	uint8_t m_ProgBitClk1 = 0;
-	uint8_t m_ProgBitClk2;
+	uint8_t m_ProgBitClk2 = 0;
-	uint8_t m_ProgBitClk3;
+	uint8_t m_ProgBitClk3 = 0;
-	uint8_t m_AnSel4;
+	uint8_t m_AnSel4 = 0;
-	uint8_t m_AnSel2;
+	uint8_t m_AnSel2 = 0;
-	uint8_t m_AnSel1;
+	uint8_t m_AnSel1 = 0;
-	uint8_t m_DriveSel1;
+	uint8_t m_DriveSel1 = 0;
-	uint8_t m_DriveSel2;
+	uint8_t m_DriveSel2 = 0;
-	uint8_t m_DriveSel3;
+	uint8_t m_DriveSel3 = 0;
-	uint8_t m_SideSelect;
+	uint8_t m_SideSelect = 0;
-	uint8_t m_Disk5VOn;
+	uint8_t m_Disk5VOn = 0;
-	uint8_t m_Disk12VOn;
+	uint8_t m_Disk12VOn = 0;
 	// output fifo, for DAC
 	uint16_t m_outfifo[16]; // technically three 74LS225 5bit*16stage FIFO chips, arranged as a 16 stage, 12-bit wide fifo (one bit unused per chip)
-	uint8_t m_outfifo_count;
+	uint8_t m_outfifo_count = 0;
-	uint8_t m_outfifo_tail_ptr;
+	uint8_t m_outfifo_tail_ptr = 0;
-	uint8_t m_outfifo_head_ptr;
+	uint8_t m_outfifo_head_ptr = 0;
 	// fifo timer
-	emu_timer *m_FIFO_timer;
+	emu_timer *m_FIFO_timer = nullptr;
 	TIMER_CALLBACK_MEMBER(timer_fifoclk);
 	// framebuffer display starting address
 	uint16_t m_DispAddr;

src/mame/drivers/novag_sexpert.cpp

@@ -176,7 +176,7 @@ private:
 	virtual void lcd_data_w(u8 data) override;
 
 	TIMER_CALLBACK_MEMBER(beep) { m_beeper->set_state(param); }
-	emu_timer *m_beeptimer;
+	emu_timer *m_beeptimer = nullptr;
 };
 
 void sforte_state::machine_start()

src/mame/drivers/nsmpoker.cpp

@@ -88,7 +88,7 @@ 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<tms9995_device> m_maincpu;
 	required_device<gfxdecode_device> m_gfxdecode;
 

src/mame/drivers/nyny.cpp

@@ -120,11 +120,11 @@ private:
 	required_shared_ptr_array<uint8_t, 2> m_colorram;
 
 	/* video-related */
-	bool     m_flipscreen;
+	bool     m_flipscreen = false;
-	bool     m_flipchars;
+	bool     m_flipchars = false;
-	uint8_t    m_star_enable;
+	uint8_t    m_star_enable = 0;
-	uint16_t   m_star_delay_counter;
+	uint16_t   m_star_delay_counter = 0;
-	uint16_t   m_star_shift_reg;
+	uint16_t   m_star_shift_reg = 0;
 
 	/* devices */
 	required_device<cpu_device> m_maincpu;

src/mame/drivers/olibochu.cpp

@@ -99,10 +99,10 @@ private:
 	required_device<generic_latch_8_device> m_soundlatch;
 
 	/* video-related */
-	tilemap_t  *m_bg_tilemap;
+	tilemap_t  *m_bg_tilemap = nullptr;
 
 	/* misc */
-	uint16_t m_cmd;
+	uint16_t m_cmd = 0;
 	void olibochu_videoram_w(offs_t offset, uint8_t data);
 	void olibochu_colorram_w(offs_t offset, uint8_t data);
 	void olibochu_flipscreen_w(uint8_t data);

src/mame/drivers/olivpc1.cpp

@@ -67,7 +67,7 @@ private:
 	required_device<pc_keyboard_device> m_keyboard;
 	required_device<wd37c65c_device> m_fdc;
 	required_device<address_map_bank_device> m_bank;
-	bool m_obf;
+	bool m_obf = false;
 };
 
 void olivpc1_state::machine_start()

src/mame/drivers/omegrace.cpp

@@ -270,7 +270,7 @@ private:
 	uint8_t spinner2_r();
 	void outputs_w(uint8_t data);
 
-	emu_timer *m_gbnmi;
+	emu_timer *m_gbnmi = nullptr;
 };
 
 

src/mame/drivers/orao.cpp

@@ -65,7 +65,7 @@ private:
 	required_device<speaker_sound_device> m_speaker;
 	required_device<cassette_image_device> m_cassette;
 	required_ioport_array<20> m_io_keyboard;
-	bool m_spr_bit;
+	bool m_spr_bit = false;
 };
 
 

src/mame/drivers/osbexec.cpp

@@ -74,15 +74,15 @@ private:
 
 	std::unique_ptr<uint8_t[]> m_fontram;
 	std::unique_ptr<uint8_t[]> m_vram;
-	uint8_t   *m_ram_0000;
+	uint8_t   *m_ram_0000 = nullptr;
-	uint8_t   *m_ram_c000;
+	uint8_t   *m_ram_c000 = nullptr;
-	uint8_t   m_temp_attr;
+	uint8_t   m_temp_attr = 0;
-	emu_timer *m_video_timer;
+	emu_timer *m_video_timer = nullptr;
 
 	/* PIA 0 (UD12) */
-	uint8_t   m_pia0_porta;
+	uint8_t   m_pia0_porta = 0;
-	uint8_t   m_pia0_portb;
+	uint8_t   m_pia0_portb = 0;
-	int     m_pia0_cb2;         /* 60/50 */
+	int     m_pia0_cb2 = 0;         /* 60/50 */
 
 	/* PIA 1 (UD8) */
 

src/mame/drivers/othello.cpp

@@ -82,14 +82,14 @@ private:
 	required_shared_ptr<uint8_t> m_videoram;
 
 	/* video-related */
-	int    m_tile_bank;
+	int    m_tile_bank = 0;
 
 	/* misc */
-	int   m_ay_select;
+	int   m_ay_select = 0;
-	int   m_ack_data;
+	int   m_ack_data = 0;
-	uint8_t m_n7751_command;
+	uint8_t m_n7751_command = 0;
-	int m_sound_addr;
+	int m_sound_addr = 0;
-	int m_n7751_busy;
+	int m_n7751_busy = 0;
 
 	/* devices */
 	required_device<cpu_device> m_maincpu;

src/mame/drivers/overdriv.cpp

@@ -99,13 +99,13 @@ private:
 	virtual void machine_reset() override;
 
 	/* video-related */
-	int       m_zoom_colorbase[2];
+	int       m_zoom_colorbase[2]{};
-	int       m_road_colorbase[2];
+	int       m_road_colorbase[2]{};
-	int       m_sprite_colorbase;
+	int       m_sprite_colorbase = 0;
-	emu_timer *m_objdma_end_timer;
+	emu_timer *m_objdma_end_timer = nullptr;
 
 	/* misc */
-	uint16_t     m_cpuB_ctrl;
+	uint16_t     m_cpuB_ctrl = 0;
 
 	/* devices */
 	required_device<cpu_device> m_maincpu;
@@ -118,7 +118,7 @@ private:
 	required_device<k053252_device> m_k053252;
 	required_device<screen_device> m_screen;
 	output_finder<> m_led;
-	int m_fake_timer;
+	int m_fake_timer = 0;
 };
 
 

src/mame/includes/nforcepc.h

@@ -82,7 +82,7 @@ protected:
 	virtual void config_map(address_map &map) override;
 
 private:
-	int ddr_ram_size;
+	int ddr_ram_size = 0;
 	std::vector<uint32_t> ram;
 	crush11_host_device *host;
 	address_space *ram_space;
@@ -104,7 +104,7 @@ protected:
 	virtual void device_reset() override;
 
 private:
-	uint8_t buffer[0xff];
+	uint8_t buffer[0xff]{};
 };
 
 DECLARE_DEVICE_TYPE(SMBUS_LOGGER, smbus_logger_device)
@@ -123,8 +123,8 @@ protected:
 	virtual void device_reset() override;
 
 private:
-	const uint8_t *buffer;
+	const uint8_t *buffer  = nullptr;
-	int buffer_size;
+	int buffer_size = 0;
 };
 
 DECLARE_DEVICE_TYPE(SMBUS_ROM, smbus_rom_device)
@@ -143,7 +143,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	uint8_t buffer[0xff];
+	uint8_t buffer[0xff]{};
 };
 
 DECLARE_DEVICE_TYPE(AS99127F, as99127f_device)
@@ -159,7 +159,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	uint8_t buffer[0xff];
+	uint8_t buffer[0xff]{};
 };
 
 DECLARE_DEVICE_TYPE(AS99127F_SENSOR2, as99127f_sensor2_device)
@@ -175,7 +175,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	uint8_t buffer[0xff];
+	uint8_t buffer[0xff]{};
 };
 
 DECLARE_DEVICE_TYPE(AS99127F_SENSOR3, as99127f_sensor3_device)