init vars for coverity (bus/l-w)

src/devices/bus/lpci/southbridge.h

@@ -78,7 +78,7 @@ protected:
 	uint8_t m_channel_check;
 	uint8_t m_nmi_enabled;
 	bool m_ide_io_ports_enabled;
-	address_space *spaceio;
+	address_space *spaceio = nullptr;
 
 	void pc_select_dma_channel(int channel, bool state);
 

src/devices/bus/mc10/mcx128.cpp

@@ -101,8 +101,8 @@ private:
 	memory_share_creator<u8> m_share;
 	memory_view m_view;
 	memory_bank_array_creator<8> m_bank;
-	uint8_t ram_bank_cr;
+	uint8_t ram_bank_cr = 0;
-	uint8_t rom_map_cr;
+	uint8_t rom_map_cr = 0;
 
 	void update_banks();
 

src/devices/bus/megadrive/eeprom.h

@@ -204,20 +204,20 @@ private:
 	std::vector<uint8_t> m_sram;
 
 	// EEPROM runtime vars
-	uint8_t m_eeprom_sda;     // current SDA
+	uint8_t m_eeprom_sda = 0;     // current SDA
-	uint8_t m_eeprom_prev_sda;    // previous SDA
+	uint8_t m_eeprom_prev_sda = 0;    // previous SDA
-	uint8_t m_eeprom_scl;     // current SCL
+	uint8_t m_eeprom_scl = 0;     // current SCL
-	uint8_t m_eeprom_prev_scl;   // previous SCL
+	uint8_t m_eeprom_prev_scl = 0;   // previous SCL
-	uint8_t m_eeprom_cnt;     // operation count in 0-9
+	uint8_t m_eeprom_cnt = 0;     // operation count in 0-9
-	uint8_t m_eeprom_readwrite;     // read/write bit
+	uint8_t m_eeprom_readwrite = 0;     // read/write bit
-	uint16_t m_eeprom_slave_mask; // dev addr
+	uint16_t m_eeprom_slave_mask = 0; // dev addr
-	uint16_t m_eeprom_word_address;  // memory addr
+	uint16_t m_eeprom_word_address = 0;  // memory addr
-	uint16_t m_eeprom_devsel;  // selected device
+	uint16_t m_eeprom_devsel = 0;  // selected device
-	uint16_t m_eeprom_byte;  // byte to be written
+	uint16_t m_eeprom_byte = 0;  // byte to be written
-	int m_eeprom_cur_state;  // current state
+	int m_eeprom_cur_state = 0;  // current state
 	// EEPROM physical characteristics (configured at init)
-	uint16_t m_eeprom_mask;       // size of the memory - 1
+	uint16_t m_eeprom_mask = 0;       // size of the memory - 1
-	uint16_t m_eeprom_pagewrite_mask;  // max number of bytes that can be written in a single write cycle
+	uint16_t m_eeprom_pagewrite_mask = 0;  // max number of bytes that can be written in a single write cycle
 
 };
 

src/devices/bus/megadrive/rom.h

@@ -501,7 +501,7 @@ protected:
 	virtual void device_reset() override;
 
 private:
-	uint16_t m_retvalue;
+	uint16_t m_retvalue = 0;
 };
 
 

src/devices/bus/msx_slot/ram_mm.h

@@ -30,7 +30,7 @@ private:
 	uint32_t m_total_size;
 	uint8_t m_bank_mask;
 	uint8_t m_bank_selected[4];
-	uint8_t *m_bank_base[4];
+	uint8_t *m_bank_base[4]{};
 	uint8_t m_ramio_set_bits;
 };
 

src/devices/bus/multibus/isbc202.h

@@ -100,38 +100,38 @@ private:
 	cpu_device *m_cpu;  // When != nullptr: CPU is suspended in wait state
 	bool m_cpu_rd;
 	uint8_t m_ready_in;
-	uint8_t m_ready_ff; // I-A44 & I-A43
+	uint8_t m_ready_ff = 0; // I-A44 & I-A43
-	bool m_gate_lower;  // I-A58-9
+	bool m_gate_lower = false;  // I-A58-9
-	bool m_irq;         // C-A37-9
+	bool m_irq = false;         // C-A37-9
-	uint8_t m_data_low_out; // C-A43
+	uint8_t m_data_low_out = 0; // C-A43
-	uint8_t m_data_low_in;  // C-A25
+	uint8_t m_data_low_in = 0;  // C-A25
-	uint8_t m_cpu_data;
+	uint8_t m_cpu_data = 0;
-	uint8_t m_addr_low_out; // C-A41
+	uint8_t m_addr_low_out = 0; // C-A41
-	bool m_mem_wrt;     // I-A58-4
+	bool m_mem_wrt = false;     // I-A58-4
-	bool m_wrt_inh;     // I-A46-13
+	bool m_wrt_inh = false;     // I-A46-13
-	bool m_direction;   // I-A58-11
+	bool m_direction = false;   // I-A58-11
-	bool m_ibus_cached;
+	bool m_ibus_cached = false;
-	uint8_t m_ibus;
+	uint8_t m_ibus = 0;
-	uint16_t m_crc;     // I-A62
+	uint16_t m_crc = 0;     // I-A62
-	bool m_crc_enabled; // I-A58-13
+	bool m_crc_enabled = false; // I-A58-13
-	bool m_crc_out;     // C-A16-2
+	bool m_crc_out = false;     // C-A16-2
-	bool m_reading;     // I-A46-9
+	bool m_reading = false;     // I-A46-9
-	bool m_writing;     // C-A16-4
+	bool m_writing = false;     // C-A16-4
-	uint16_t m_data_sr; // C-A36 & C-A29 (MSB), next byte in LSB
+	uint16_t m_data_sr = 0; // C-A36 & C-A29 (MSB), next byte in LSB
-	bool m_last_data_bit;   // I-A48-6
+	bool m_last_data_bit = false;   // I-A48-6
-	uint16_t m_clock_sr;    // C-A34 & C-A27 (MSB), next byte in LSB
+	uint16_t m_clock_sr = 0;    // C-A34 & C-A27 (MSB), next byte in LSB
 	attotime m_last_f_time;
-	bool m_clock_gate;  // I-A10-8
+	bool m_clock_gate = false;  // I-A10-8
-	bool m_amwrt;       // I-A58-6
+	bool m_amwrt = false;       // I-A58-6
-	bool m_dlyd_amwrt;
+	bool m_dlyd_amwrt = false;
 
 	// PLL
 	fdc_pll_t m_pll;
 
 	// Timers
-	emu_timer *m_timeout_timer;
+	emu_timer *m_timeout_timer = nullptr;
-	emu_timer *m_byte_timer;
+	emu_timer *m_byte_timer = nullptr;
-	emu_timer *m_f_timer;
+	emu_timer *m_f_timer = nullptr;
 
 	void set_output();
 	unsigned selected_drive() const;

src/devices/bus/neogeo/boot_kof10th.h

@@ -36,10 +36,10 @@ protected:
 	virtual void device_add_mconfig(machine_config &config) override;
 
 private:
-	uint8_t* m_fixed;
+	uint8_t* m_fixed = nullptr;
-	uint32_t m_special_bank;
+	uint32_t m_special_bank = 0;
-	uint16_t m_cart_ram[0x1000];
+	uint16_t m_cart_ram[0x1000]{};
-	uint16_t m_cart_ram2[0x10000];
+	uint16_t m_cart_ram2[0x10000]{};
 };
 
 // device type definition

src/devices/bus/neogeo/prot_kof2k3bl.h

@@ -29,9 +29,9 @@ protected:
 	virtual void device_reset() override;
 
 private:
-	uint16_t m_overlay;
+	uint16_t m_overlay = 0;
-	uint32_t m_bank_base;
+	uint32_t m_bank_base = 0;
-	uint16_t m_cartridge_ram[0x1000]; // bootlegs
+	uint16_t m_cartridge_ram[0x1000]{}; // bootlegs
 };
 
 #endif // MAME_BUS_NEOGEO_PROT_KOF2K3BL_H

src/devices/bus/neogeo/slot.h

@@ -334,7 +334,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	int m_type;
+	int m_type = 0;
 	device_neogeo_cart_interface*       m_cart;
 };
 

src/devices/bus/neogeo_ctrl/kizuna4p.h

@@ -40,7 +40,7 @@ protected:
 private:
 	required_ioport_array<4> m_joy;
 	required_ioport_array<2> m_ss;
-	uint8_t m_ctrl_sel;
+	uint8_t m_ctrl_sel = 0;
 };
 
 

src/devices/bus/nes/disksys.h

@@ -57,7 +57,7 @@ private:
 	uint16_t m_irq_count, m_irq_count_latch;
 	int m_irq_enable, m_irq_repeat, m_irq_transfer;
 	int m_disk_reg_enable;
-	bool m_sound_en;
+	bool m_sound_en = false;
 
 	uint8_t m_fds_motor_on;
 	uint8_t m_fds_door_closed;

src/devices/bus/nes/jy.h

@@ -42,27 +42,27 @@ protected:
 	virtual void update_mirror() { update_mirror_typea(); }
 	inline uint8_t unscramble(uint8_t bank);
 
-	uint8_t m_mul[2];
+	uint8_t m_mul[2]{};
-	uint8_t m_latch;
+	uint8_t m_latch = 0;
-	uint8_t m_reg[4];
+	uint8_t m_reg[4]{};
-	uint8_t m_chr_latch[2];   // type C uses a more complex CHR 4K mode, and these vars are only changed for those games
+	uint8_t m_chr_latch[2]{};   // type C uses a more complex CHR 4K mode, and these vars are only changed for those games
-	uint8_t m_mmc_prg_bank[4];
+	uint8_t m_mmc_prg_bank[4]{};
-	uint16_t m_mmc_nt_bank[4];
+	uint16_t m_mmc_nt_bank[4]{};
-	uint16_t m_mmc_vrom_bank[8];
+	uint16_t m_mmc_vrom_bank[8]{};
-	uint16_t m_extra_chr_bank;
+	uint16_t m_extra_chr_bank = 0;
-	uint16_t m_extra_chr_mask;
+	uint16_t m_extra_chr_mask = 0;
-	int m_bank_6000;
+	int m_bank_6000 = 0;
 
-	uint8_t m_irq_mode;
+	uint8_t m_irq_mode = 0;
-	uint8_t m_irq_count;
+	uint8_t m_irq_count = 0;
-	uint8_t m_irq_prescale;
+	uint8_t m_irq_prescale = 0;
-	uint8_t m_irq_prescale_mask;
+	uint8_t m_irq_prescale_mask = 0;
-	uint8_t m_irq_flip;
+	uint8_t m_irq_flip = 0;
-	int m_irq_enable;
+	int m_irq_enable = 0;
-	int m_irq_up, m_irq_down;
+	int m_irq_up = 0, m_irq_down = 0;
 
 	static const device_timer_id TIMER_IRQ = 0;
-	emu_timer *irq_timer;
+	emu_timer *irq_timer = nullptr;
 	attotime timer_freq;
 };
 

src/devices/bus/nes/kaiser.h

@@ -23,7 +23,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	u8 m_latch;
+	u8 m_latch = 0;
 };
 
 
@@ -63,7 +63,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	uint8_t m_latch;
+	uint8_t m_latch = 0;
 };
 
 
@@ -88,11 +88,11 @@ protected:
 	virtual void device_start() override;
 	virtual void device_timer(emu_timer &timer, device_timer_id id, int param) override;
 
-	u8 m_reg[8];
+	u8 m_reg[8]{};
 
 private:
 	void prg_update();
-	u8 m_latch;
+	u8 m_latch = 0;
 
 	u16 m_irq_count, m_irq_count_latch;
 	int m_irq_enable;
@@ -136,7 +136,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	u8 m_latch;
+	u8 m_latch = 0;
 	const u8 m_a15_flip;
 };
 
@@ -171,7 +171,7 @@ protected:
 	virtual void device_timer(emu_timer &timer, device_timer_id id, int param) override;
 
 private:
-	uint8_t m_latch;
+	uint8_t m_latch = 0;
 
 	uint16_t m_irq_count;
 	uint8_t m_irq_status;
@@ -218,7 +218,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	u8 m_latch;
+	u8 m_latch = 0;
 };
 
 
@@ -327,7 +327,7 @@ protected:
 
 private:
 	void update_prg();
-	uint8_t m_latch;
+	uint8_t m_latch = 0;
 	uint8_t m_reg[8];
 };
 

src/devices/bus/nes/mmc3_clones.h

@@ -187,7 +187,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	int m_prot;
+	int m_prot = 0;
 };
 
 
@@ -320,7 +320,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	uint8_t m_prot;
+	uint8_t m_prot = 0;
 };
 
 

src/devices/bus/nes/nes_slot.h

@@ -314,7 +314,7 @@ public:
 	// PRG
 	inline int prg_8k_bank_num(int bank);
 	inline void update_prg_banks(int prg_bank_start, int prg_bank_end);
-	memory_bank *m_prg_bank_mem[4];
+	memory_bank *m_prg_bank_mem[4]{};
 	int m_prg_bank[4];
 	uint32_t m_prg_chunks;
 	uint32_t m_prg_mask;
@@ -337,7 +337,7 @@ public:
 	//because some of these change multiple times per scanline!
 	int m_chr_src[8]; //defines source of base pointer
 	int m_chr_orig[8]; //defines offset of 0x400 byte segment at base pointer
-	uint8_t *m_chr_access[8];  //source translated + origin -> valid pointer!
+	uint8_t *m_chr_access[8]{};  //source translated + origin -> valid pointer!
 
 	uint32_t m_vrom_chunks;
 	uint32_t m_vram_chunks;
@@ -371,7 +371,7 @@ public:
 	int m_nt_src[4];
 	int m_nt_orig[4];
 	int m_nt_writable[4];
-	uint8_t *m_nt_access[4];  //quick banking structure for a maximum of 4K of RAM/ROM/ExRAM
+	uint8_t *m_nt_access[4]{};  //quick banking structure for a maximum of 4K of RAM/ROM/ExRAM
 
 	void set_nt_page(int page, int source, int bank, int writable);
 	void set_nt_mirroring(int mirroring);

src/devices/bus/nes/pirate.h

@@ -64,7 +64,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	uint8_t m_latch;
+	uint8_t m_latch = 0;
 	uint8_t m_ram[0xb00];
 };
 
@@ -174,7 +174,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	uint8_t m_latch;
+	uint8_t m_latch = 0;
 };
 
 
@@ -198,7 +198,7 @@ protected:
 
 private:
 	void update_banks();
-	u8 m_latch;
+	u8 m_latch = 0;
 	u8 m_reg[6];
 
 	u16 m_irq_count, m_irq_count_latch;
@@ -224,7 +224,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	uint16_t m_latch;
+	uint16_t m_latch = 0;
 };
 
 
@@ -247,7 +247,7 @@ protected:
 
 private:
 	u8 m_jumper;
-	u16 m_latch;
+	u16 m_latch = 0;
 	u8 m_reg;
 };
 
@@ -272,7 +272,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	uint8_t m_latch;
+	uint8_t m_latch = 0;
 };
 #endif
 

src/devices/bus/nes/vrc_clones.h

@@ -148,7 +148,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	u8 m_reg;
+	u8 m_reg = 0;
 };
 
 
@@ -203,7 +203,7 @@ protected:
 
 private:
 	u16 m_irq_count;
-	u8 m_irq_latch;
+	u8 m_irq_latch = 0;
 	int m_irq_enable;
 
 	static const device_timer_id TIMER_IRQ = 0;
@@ -230,7 +230,7 @@ protected:
 	virtual void device_start() override;
 
 private:
-	u8 m_chr_mask, m_chr_match;
+	u8 m_chr_mask = 0, m_chr_match;
 };
 
 // ======================> nes_hengg_shjy3_device

src/devices/bus/newbrain/fdc.h

@@ -62,12 +62,12 @@ private:
 
 	void moton(int state);
 
-	int m_paging;
+	int m_paging = 0;
-	int m_ma16;
+	int m_ma16 = 0;
-	int m_mpm;
+	int m_mpm = 0;
-	int m_fdc_att;
+	int m_fdc_att = 0;
-	int m_fdc_int;
+	int m_fdc_int = 0;
-	int m_pa15;
+	int m_pa15 = 0;
 };
 
 

src/devices/bus/nscsi/cd.h

@@ -46,13 +46,13 @@ private:
 	uint32_t bytes_per_block;
 	int lba, cur_sector;
 	required_device<cdrom_image_device> image;
-	uint8_t mode_data[12];
+	uint8_t mode_data[12]{};
 
-	char manufacturer[8];
+	char manufacturer[8]{};
-	char product[16];
+	char product[16]{};
-	char revision[4];
+	char revision[4]{};
-	uint8_t inquiry_data;
+	uint8_t inquiry_data = 0;
-	uint8_t compliance;
+	uint8_t compliance = 0;
 
 	void return_no_cd();
 	static int to_msf(int frame);

src/devices/bus/nscsi/cw7501.h

@@ -32,7 +32,7 @@ private:
 
 	required_device<m37710s4_device> m_cdcpu;
 
-	u8 m_mystery_address;
+	u8 m_mystery_address = 0;
 };
 
 class cdr4210_device : public cw7501_device

src/devices/bus/nubus/laserview.h

@@ -40,8 +40,8 @@ private:
 
 	std::vector<uint8_t> m_vram;
 	uint32_t m_vbl_disable, m_palette[2];
-	int m_prot_state;
+	int m_prot_state = 0;
-	int m_toggle;
+	int m_toggle = 0;
 };
 
 // device type definition

src/devices/bus/nubus/nubus_image.h

@@ -37,13 +37,13 @@ protected:
 
 	struct nbfilectx
 	{
-		uint32_t curcmd;
+		uint32_t curcmd = 0;
-		char filename[128];
+		char filename[128]{};
 		std::string curdir;
 		osd::directory::ptr dirp;
 		osd_file::ptr fd;
-		uint64_t filelen;
+		uint64_t filelen = 0;
-		uint32_t bytecount;
+		uint32_t bytecount = 0;
 	};
 
 	nubus_image_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);

src/devices/bus/pc_kbd/pcat101.h

@@ -46,8 +46,8 @@ private:
 	required_ioport_array<16> m_matrix;
 	output_finder<3> m_leds;
 
-	u8 m_porta;
+	u8 m_porta = 0;
-	u8 m_portc;
+	u8 m_portc = 0;
 };
 
 // device type definition

src/devices/bus/pce/pce_rom.h

@@ -103,7 +103,7 @@ private:
 	const uint32_t m_bram_size = 0x800*4;
 	uint8_t m_bram[0x800*4];
 
-	uint8_t m_bram_locked;
+	uint8_t m_bram_locked = false;
 };
 
 

src/devices/bus/pofo/hpc102.h

@@ -48,7 +48,7 @@ protected:
 private:
 	required_device<ins8250_device> m_uart;
 
-	uint8_t m_vector;
+	uint8_t m_vector = 0;
 };
 
 

src/devices/bus/pofo/hpc104.h

@@ -60,8 +60,8 @@ private:
 	memory_share_creator<uint8_t> m_nvram;
 	required_ioport m_io_sw1;
 
-	bool m_sw1;
+	bool m_sw1 = false;
-	bool m_ncc1_out;
+	bool m_ncc1_out = false;
 };
 
 

src/devices/bus/qbus/dvk_kgd.h

@@ -50,12 +50,12 @@ protected:
 
 private:
 	std::unique_ptr<uint8_t[]> m_videoram_base;
-	uint8_t *m_videoram;
+	uint8_t *m_videoram = nullptr;
 
-	uint16_t m_cr;
+	uint16_t m_cr = 0;
-	uint16_t m_dr;
+	uint16_t m_dr = 0;
-	uint16_t m_ar;
+	uint16_t m_ar = 0;
-	uint16_t m_ct;
+	uint16_t m_ct = 0;
 };
 
 

src/devices/bus/qbus/pc11.h

@@ -61,17 +61,17 @@ private:
 	int m_rxvec;
 	int m_txvec;
 
-	device_image_interface *m_fd;
+	device_image_interface *m_fd = nullptr;
 
-	line_state m_rxrdy;
+	line_state m_rxrdy{};
-	line_state m_txrdy;
+	line_state m_txrdy{};
 
-	uint16_t m_rcsr;
+	uint16_t m_rcsr = 0;
-	uint16_t m_rbuf;
+	uint16_t m_rbuf = 0;
-	uint16_t m_tcsr;
+	uint16_t m_tcsr = 0;
-	uint16_t m_tbuf;
+	uint16_t m_tbuf = 0;
 
-	const char *pc11_regnames[4];
+	const char *pc11_regnames[4]{};
 };
 
 

src/devices/bus/rs232/mboardd.cpp

@@ -57,8 +57,8 @@ private:
 	void c000_w(u8 data) { m_c000_latch = data; };
 
 	void m6803_mem(address_map &map);
-	int m_rx_state;
+	int m_rx_state = 0;
-	u8 m_c000_latch;
+	u8 m_c000_latch = 0;
 };
 
 mockingboard_d_device::mockingboard_d_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)

src/devices/bus/rtpc/kbd.h

@@ -36,10 +36,10 @@ private:
 	required_ioport_array<8> m_matrix[4];
 	output_finder<3> m_leds;
 
-	bool m_t1;
+	bool m_t1 = false;
-	u8 m_bus;
+	u8 m_bus = 0;
-	u8 m_p1;
+	u8 m_p1 = 0;
-	u8 m_p2;
+	u8 m_p2 = 0;
 };
 
 DECLARE_DEVICE_TYPE(RTPC_KBD, rtpc_kbd_device)

src/devices/bus/sat_ctrl/ctrl.h

@@ -34,7 +34,7 @@ public:
 protected:
 	device_saturn_control_port_interface(const machine_config &mconfig, device_t &device);
 
-	uint8_t m_ctrl_id;
+	uint8_t m_ctrl_id = 0;
 	saturn_control_port_device *m_port;
 };
 

src/devices/bus/sbus/cgsix.h

@@ -470,36 +470,36 @@ protected:
 		uint32_t m_itri_relx;
 		uint32_t m_itri_rely;
 		uint32_t m_itri_relz;
-		uint32_t m_itri_r;
+		uint32_t m_itri_r = 0;
-		uint32_t m_itri_g;
+		uint32_t m_itri_g = 0;
-		uint32_t m_itri_b;
+		uint32_t m_itri_b = 0;
-		uint32_t m_itri_a;
+		uint32_t m_itri_a = 0;
 
-		uint32_t m_iquad_absx;
+		uint32_t m_iquad_absx = 0;
-		uint32_t m_iquad_absy;
+		uint32_t m_iquad_absy = 0;
-		uint32_t m_iquad_absz;
+		uint32_t m_iquad_absz = 0;
-		uint32_t m_iquad_relx;
+		uint32_t m_iquad_relx = 0;
-		uint32_t m_iquad_rely;
+		uint32_t m_iquad_rely = 0;
-		uint32_t m_iquad_relz;
+		uint32_t m_iquad_relz = 0;
-		uint32_t m_iquad_r;
+		uint32_t m_iquad_r = 0;
-		uint32_t m_iquad_g;
+		uint32_t m_iquad_g = 0;
-		uint32_t m_iquad_b;
+		uint32_t m_iquad_b = 0;
-		uint32_t m_iquad_a;
+		uint32_t m_iquad_a = 0;
 
-		uint32_t m_irect_absx;
+		uint32_t m_irect_absx = 0;
-		uint32_t m_irect_absy;
+		uint32_t m_irect_absy = 0;
-		uint32_t m_irect_absz;
+		uint32_t m_irect_absz = 0;
-		uint32_t m_irect_relx;
+		uint32_t m_irect_relx = 0;
-		uint32_t m_irect_rely;
+		uint32_t m_irect_rely = 0;
-		uint32_t m_irect_relz;
+		uint32_t m_irect_relz = 0;
-		uint32_t m_irect_r;
+		uint32_t m_irect_r = 0;
-		uint32_t m_irect_g;
+		uint32_t m_irect_g = 0;
-		uint32_t m_irect_b;
+		uint32_t m_irect_b = 0;
-		uint32_t m_irect_a;
+		uint32_t m_irect_a = 0;
 
 		std::unique_ptr<vertex[]> m_prim_buf;
-		uint32_t m_vertex_count;
+		uint32_t m_vertex_count = 0;
-		uint32_t m_curr_prim_type;
+		uint32_t m_curr_prim_type = 0;
 	};
 
 	uint32_t m_thc_misc;

src/devices/bus/sbus/sbus.h

@@ -100,12 +100,12 @@ protected:
 	// internal state
 	required_device<sparc_base_device> m_maincpu;
 	required_address_space m_type1space;
-	address_space *m_space;
+	address_space *m_space = nullptr;
 
 	devcb_write_line::array<7> m_irq_cb;
 	devcb_write32 m_buserr;
 
-	device_sbus_card_interface *m_device_list[3];
+	device_sbus_card_interface *m_device_list[3]{};
 
 private:
 	void slot1_timeout_map(address_map &map);
@@ -148,7 +148,7 @@ protected:
 
 	optional_device<sbus_device> m_sbus_finder;
 	sbus_device *m_sbus;
-	const char *m_sbus_slottag;
+	const char *m_sbus_slottag = nullptr;
 	int m_slot;
 	uint32_t m_base;
 };

src/devices/bus/scsi/omti5100.h

@@ -24,7 +24,7 @@ protected:
 private:
 	required_device<harddisk_image_device> m_image0;
 	required_device<harddisk_image_device> m_image1;
-	hard_disk_file::info m_param[2];
+	hard_disk_file::info m_param[2]{};
 };
 
 DECLARE_DEVICE_TYPE(OMTI5100, omti5100_device)

src/devices/bus/scsi/scsi.h

@@ -195,7 +195,7 @@ protected:
 	int m_msg;
 	int m_req;
 	int m_ack;
-	int m_atn;
+	int m_atn = 0;
 	int m_rst;
 	int m_data0;
 	int m_data1;

src/devices/bus/scsi/scsicd512.h

@@ -37,7 +37,7 @@ protected:
 	char m_manufacturer[8];
 	char m_product[16];
 	char m_revision[4];
-	uint8_t m_data;
+	uint8_t m_data = 0;
 };
 
 class dec_rrd45_device : public scsicd512_device

src/devices/bus/sega8/rom.h

@@ -392,8 +392,8 @@ protected:
 	virtual void device_start() override;
 	virtual void device_reset() override;
 
-	uint8_t m_gamesel;
+	uint8_t m_gamesel = 0;
-	uint8_t m_readxor;
+	uint8_t m_readxor = 0;
 };
 
 
@@ -420,7 +420,7 @@ protected:
 	virtual void device_reset() override;
 
 private:
-	uint8_t m_block;
+	uint8_t m_block = 0;
 };
 
 
@@ -447,7 +447,7 @@ protected:
 	virtual void device_reset() override;
 
 private:
-	uint8_t m_block;
+	uint8_t m_block = 0;
 };
 
 class sega8_x_terminator_device : public sega8_rom_device

src/devices/bus/sg1000_exp/sg1000exp.h

@@ -72,7 +72,7 @@ public:
 protected:
 	device_sg1000_expansion_slot_interface(const machine_config &mconfig, device_t &device);
 
-	sg1000_expansion_slot_device *m_port;
+	sg1000_expansion_slot_device *m_port = nullptr;
 };
 
 

src/devices/bus/snes/sa1.h

@@ -139,8 +139,8 @@ private:
 	u8 m_iram_write_snes, m_iram_write_sa1;
 	// $2230-$2231
 	u8 m_dma_ctrl, m_dma_ccparam;
-	u8 m_dma_cconv_size;
+	u8 m_dma_cconv_size = 0;
-	u8 m_dma_cconv_bits;
+	u8 m_dma_cconv_bits = 8;
 	// DMA Control (DCNT)
 	inline const bool DCNT_DMAEN()   { return BIT(m_dma_ctrl, 7); }                        // DMA Enable control
 	//inline const bool DCNT_DPRIO() { return BIT(m_dma_ctrl, 6); }                        // Processing priority between SA-1 CPU and DMA; Not emulated currently

src/devices/bus/snes/sdd1.h

@@ -73,8 +73,8 @@ protected:
 
 	struct SDD1_PEM_ContextInfo
 	{
-		uint8_t status;
+		uint8_t status = 0;
-		uint8_t MPS;
+		uint8_t MPS = 0;
 	};
 
 	class SDD1_PEM //Probability Estimation Module
@@ -167,8 +167,8 @@ protected:
 
 	struct
 	{
-		uint32_t addr;    // $43x2-$43x4 -- DMA transfer address
+		uint32_t addr = 0;    // $43x2-$43x4 -- DMA transfer address
-		uint16_t size;    // $43x5-$43x6 -- DMA transfer size
+		uint16_t size = 0;    // $43x5-$43x6 -- DMA transfer size
 	} m_dma[8];
 
 	std::unique_ptr<SDD1_emu> m_sdd1emu;
@@ -176,9 +176,9 @@ protected:
 	struct
 	{
 		std::unique_ptr<uint8_t[]> data;    // pointer to decompressed S-DD1 data (65536 bytes)
-		uint16_t offset;  // read index into S-DD1 decompression buffer
+		uint16_t offset = 0;  // read index into S-DD1 decompression buffer
-		uint32_t size;    // length of data buffer; reads decrement counter, set ready to false at 0
+		uint32_t size = 0;    // length of data buffer; reads decrement counter, set ready to false at 0
-		uint8_t ready;    // 1 when data[] is valid; 0 to invoke sdd1emu.decompress()
+		uint8_t ready = 0;    // 1 when data[] is valid; 0 to invoke sdd1emu.decompress()
 	} m_buffer;
 };
 

src/devices/bus/spectrum/beta.h

@@ -60,10 +60,10 @@ protected:
 	required_device_array<floppy_connector, 4> m_floppy;
 	required_device<spectrum_expansion_slot_device> m_exp;
 
-	int m_romcs;
+	int m_romcs = 0;
-	u8 m_masterdisable;
+	u8 m_masterdisable = 0;
 	u8 m_control;
-	bool m_motor_active;
+	bool m_motor_active = false;
 	void fdc_hld_w(int state);
 	virtual void motors_control();
 

src/devices/bus/spectrum/d40.h

@@ -86,9 +86,9 @@ protected:
 	void fdc_drq_w(int state);
 	virtual void nmi_check() override;
 
-	uint8_t m_control;
+	uint8_t m_control = 0;
-	int m_intrq;
+	int m_intrq = 0;
-	int m_drq;
+	int m_drq = 0;
 };
 
 class spectrum_d80_device :

src/devices/bus/spectrum/kempdisc.h

@@ -56,8 +56,8 @@ protected:
 	required_device_array<floppy_connector, 4> m_floppy;
 	required_device<spectrum_expansion_slot_device> m_exp;
 
-	int m_romcs;
+	int m_romcs = 0;
-//  u8 m_control;
+//  u8 m_control = 0;
 };
 
 class spectrum_spdos_device :

src/devices/bus/spectrum/lprint.h

@@ -46,8 +46,8 @@ protected:
 	required_memory_region m_rom;
 	required_device<centronics_device> m_centronics;
 
-	int m_romcs;
+	int m_romcs = 0;
-	int m_busy;
+	int m_busy = 0;
 };
 
 class spectrum_lprint3_device :
@@ -87,8 +87,8 @@ protected:
 	required_device<rs232_port_device> m_rs232;
 	required_device<spectrum_expansion_slot_device> m_exp;
 
-	int m_romcs;
+	int m_romcs = 0;
-	int m_busy;
+	int m_busy = 0;
 };
 
 class spectrum_kempcentrs_device :
@@ -115,7 +115,7 @@ protected:
 
 	required_device<centronics_device> m_centronics;
 
-	int m_busy;
+	int m_busy = 0;
 };
 
 class spectrum_kempcentre_device :
@@ -150,9 +150,9 @@ protected:
 	required_memory_region m_rom;
 	required_device<centronics_device> m_centronics;
 
-	int m_active;
+	int m_active = 0;
-	int m_romcs;
+	int m_romcs = 0;
-	int m_busy;
+	int m_busy = 0;
 };
 
 class spectrum_kempcentreu_device :

src/devices/bus/spectrum/mface.h

@@ -53,8 +53,8 @@ protected:
 	required_memory_region m_rom;
 	required_device<spectrum_expansion_slot_device> m_exp;
 
-	int m_romcs;
+	int m_romcs = 0;
-	int m_nmi_pending;
+	int m_nmi_pending = 0;
 	std::unique_ptr<uint8_t[]> m_ram;
 };
 
@@ -143,7 +143,7 @@ protected:
 	virtual void device_start() override;
 	virtual void device_reset() override;
 
-	int m_hidden;
+	int m_hidden = 0;
 };
 
 class spectrum_mface128v1_device : public spectrum_mface128_base_device
@@ -163,7 +163,7 @@ protected:
 	virtual uint8_t iorq_r(offs_t offset) override;
 	virtual void iorq_w(offs_t offset, uint8_t data) override;
 
-	int m_d3_ff;  // no initial state
+	int m_d3_ff = 0;  // no initial state
 };
 
 class spectrum_mface128_device : public spectrum_mface128v1_device
@@ -200,8 +200,8 @@ protected:
 	virtual void iorq_w(offs_t offset, uint8_t data) override;
 
 private:
-	uint8_t m_reg_file[4];  // no initial state
+	uint8_t m_reg_file[4]{};  // no initial state
-	int m_disable;
+	int m_disable = 0;
 };
 
 class spectrum_mprint_device : public spectrum_mface128_base_device
@@ -227,7 +227,7 @@ private:
 
 	required_device<centronics_device> m_centronics;
 
-	int m_busy;
+	int m_busy = 0;
 };
 
 

src/devices/bus/spectrum/mgt.h

@@ -60,7 +60,7 @@ protected:
 	required_device_array<floppy_connector, 2> m_floppy;
 	required_device<centronics_device> m_centronics;
 
-	int m_romcs;
+	int m_romcs = 0;
 	uint8_t m_ram[8 * 1024];
 	bool m_centronics_busy;
 };

src/devices/bus/spectrum/sixword.h

@@ -64,10 +64,10 @@ protected:
 	required_device<rs232_port_device> m_rs232;
 	required_ioport m_joy;
 
-	int m_romcs;
+	int m_romcs = 0;
-	u8 m_ram[0x2000];
+	u8 m_ram[0x2000]{};
-	u16 m_rombank;
+	u16 m_rombank = 0;
-	u8 m_control;
+	u8 m_control = 0;
 };
 
 class spectrum_swiftdisc2_device :

src/devices/bus/ss50/piaide.cpp

@@ -70,8 +70,8 @@ private:
 	optional_device<pia6821_device> m_pia;
 	optional_device<ide_controller_device> m_ide;
 
-	uint8_t m_pia_porta;
+	uint8_t m_pia_porta = 0;
-	uint8_t m_pia_portb;
+	uint8_t m_pia_portb = 0;
 
 	uint8_t pia_a_r();
 	uint8_t pia_b_r();

src/devices/bus/tanbus/radisc.h

@@ -64,8 +64,8 @@ private:
 
 	int m_beeper_state;
 	uint8_t m_drive_control;
-	int m_irq_enable;
+	int m_irq_enable = 0;
-	int m_drq_enable;
+	int m_drq_enable = 0;
 };
 
 

src/devices/bus/tanbus/tanbus.h

@@ -51,7 +51,7 @@ protected:
 private:
 	required_device<tanbus_device> m_tanbus;
 
-	int m_bus_num;
+	int m_bus_num = 0;
 };
 
 // device type definition

src/devices/bus/ti99/gromport/cartridges.h

@@ -112,7 +112,7 @@ private:
 		const std::string m_pathname;
 	};
 
-	bool    m_readrom;
+	bool    m_readrom = false;
 	int     m_pcbtype;
 	int     m_slot;
 	int     get_index_from_tagname();
@@ -155,12 +155,12 @@ protected:
 	template <typename Format, typename... Params> void logerror(Format &&fmt, Params &&... args) const { m_cart->logerror(fmt, args...); }
 
 	ti99_cartridge_device*  m_cart;
-	tmc0430_device*     m_grom[5];
+	tmc0430_device*     m_grom[5]{};
 	bool                m_grom_idle;
 	int                 m_grom_size;
 	int                 m_rom_size;
 	int                 m_ram_size;
-	int                 m_bank_mask;
+	int                 m_bank_mask = 0;
 
 	uint8_t*              m_rom_ptr;
 	uint8_t*              m_ram_ptr;

src/devices/bus/ti99/gromport/gromport.h

@@ -99,7 +99,7 @@ protected:
 	virtual void device_config_complete() override;
 
 	gromport_device*    m_gromport;
-	bool     m_grom_selected;
+	bool     m_grom_selected = false;
 };
 
 } // end namespace bus::ti99::gromport

src/devices/bus/ti99/gromport/multiconn.h

@@ -45,11 +45,11 @@ protected:
 	virtual ioport_constructor device_input_ports() const override;
 
 private:
-	bool m_readrom;
+	bool m_readrom = false;
 	int     m_active_slot;
 	int     m_fixed_slot;
 	int     m_next_free_slot;
-	ti99_cartridge_device*  m_cartridge[NUMBER_OF_CARTRIDGE_SLOTS];
+	ti99_cartridge_device*  m_cartridge[NUMBER_OF_CARTRIDGE_SLOTS]{};
 
 	void    set_slot(int slotnumber);
 	int     get_active_slot(bool changebase, offs_t offset);

src/devices/bus/ti99/internal/998board.h

@@ -236,7 +236,7 @@ private:
 	video_waitstate_generator m_vidws;
 
 	// Pointer to mainboard
-	mainboard8_device* m_mainboard;
+	mainboard8_device* m_mainboard = nullptr;
 };
 
 /*
@@ -323,7 +323,7 @@ private:
 	int m_msast = 0;
 
 	// Pointer to mainboard
-	mainboard8_device* m_mainboard;
+	mainboard8_device* m_mainboard = nullptr;
 };
 
 /*
@@ -381,7 +381,7 @@ private:
 	uint8_t* m_sram = nullptr;
 
 	// Pointer to mainboard
-	mainboard8_device* m_mainboard;
+	mainboard8_device* m_mainboard = nullptr;
 
 	// Keep the system ready state
 	int m_srdy = 0;

src/devices/bus/ti99/internal/genkbd.h

@@ -40,8 +40,8 @@ protected:
 	virtual DECLARE_WRITE_LINE_MEMBER( data_write ) override;
 
 private:
-	emu_timer   *m_poll_timer;
+	emu_timer   *m_poll_timer = nullptr;
-	emu_timer   *m_send_timer;
+	emu_timer   *m_send_timer = nullptr;
 
 	static constexpr unsigned KEYQUEUESIZE = 256;
 	static constexpr unsigned MAXKEYMSGLENGTH = 10;
@@ -55,7 +55,7 @@ private:
 	required_ioport_array<8> m_keys;
 
 	int m_queue_length;
-	int     m_queue_head;
+	int     m_queue_head = 0;
 	uint8_t   m_queue[KEYQUEUESIZE];
 	uint32_t  m_key_state_save[4];
 	int m_autorepeat_code;
@@ -63,22 +63,22 @@ private:
 	bool m_fake_shift_state;
 	bool m_fake_unshift_state;
 
-	bool m_left_shift;
+	bool m_left_shift = false;
-	bool m_right_shift;
+	bool m_right_shift = false;
-	bool m_left_ctrl;
+	bool m_left_ctrl = false;
-	bool m_right_ctrl;
+	bool m_right_ctrl = false;
-	bool m_left_alt;
+	bool m_left_alt = false;
-	bool m_altgr;
+	bool m_altgr = false;
-	bool m_numlock;
+	bool m_numlock = false;
 
 	bool m_resetting;
 
 	line_state m_clock_line;
 	line_state m_data_line;
-	int m_reset_timer;
+	int m_reset_timer = 0;
 
-	int m_shift_reg;
+	int m_shift_reg = 0;
-	int m_shift_count;
+	int m_shift_count = 0;
 };
 
 

src/devices/bus/ti99/peb/bwg.h

@@ -113,7 +113,7 @@ private:
 	required_device<ram_device> m_buffer_ram;
 
 	// Link to the attached floppy drives
-	floppy_image_device*    m_floppy[4];
+	floppy_image_device*    m_floppy[4]{};
 
 	// Currently selected floppy drive (1-4, 0=none)
 	int m_sel_floppy;

src/devices/bus/ti99/peb/cc_fdc.h

@@ -90,7 +90,7 @@ protected:
 	void operate_ready_line();
 
 	// Link to the attached floppy drives
-	floppy_image_device*    m_floppy[4];
+	floppy_image_device*    m_floppy[4]{};
 
 	// Motor monoflop
 	required_device<ttl74123_device> m_motormf;

src/devices/bus/ti99/peb/evpc.h

@@ -42,11 +42,11 @@ public:
 protected:
 	struct evpc_palette
 	{
-		uint8_t       read_index, write_index, mask;
+		uint8_t       read_index = 0, write_index = 0, mask = 0;
-		int         read;
+		int         read = 0;
-		int         state;
+		int         state = 0;
-		struct { uint8_t red, green, blue; } color[0x100];
+		struct { uint8_t red = 0, green = 0, blue = 0; } color[0x100];
-		//int dirty;
+		//int dirty = 0;
 	};
 
 	void device_start() override;
@@ -66,7 +66,7 @@ private:
 
 	DECLARE_WRITE_LINE_MEMBER( video_interrupt_in );
 
-	int     m_address;
+	int     m_address = 0;
 	int     m_dsr_page;
 	bool    m_inDsrArea;
 	bool    m_novram_accessed;

src/devices/bus/ti99/peb/hfdc.h

@@ -100,10 +100,10 @@ private:
 	required_device<mm58274c_device> m_clock;
 
 	// Link to the attached floppy drives
-	floppy_image_device*    m_floppy_unit[4];
+	floppy_image_device*    m_floppy_unit[4]{};
 
 	// Link to the attached hard disks
-	mfm_harddisk_device*    m_harddisk_unit[3];
+	mfm_harddisk_device*    m_harddisk_unit[3]{};
 
 	// Currently selected floppy drive
 	floppy_image_device*    m_current_floppy;

src/devices/bus/ti99/peb/horizon.h

@@ -77,8 +77,8 @@ private:
 	int     m_cru_base_phoenix;
 
 	// Debugging
-	int     m_current_bank;
+	int     m_current_bank = 0;
-	int     m_current_page;
+	int     m_current_page = 0;
 };
 
 } // end namespace bus::ti99::peb

src/devices/bus/ti99/peb/memex.h

@@ -39,7 +39,7 @@ protected:
 private:
 	bool    access_enabled(offs_t offset);
 	required_device<ram_device> m_ram;
-	uint8_t   m_switches;
+	uint8_t   m_switches = 0;
 };
 
 } // end namespace bus::ti99::peb

src/devices/bus/ti99/peb/myarcfdc.h

@@ -86,7 +86,7 @@ private:
 	uint8_t* m_dsrrom;
 
 	// Link to the attached floppy drives
-	floppy_image_device*    m_floppy[4];
+	floppy_image_device*    m_floppy[4]{};
 
 	// Debugger accessors
 	void debug_read(offs_t offset, uint8_t* value);

src/devices/bus/ti99/peb/peribox.h

@@ -191,7 +191,7 @@ protected:
 	device_ti99_peribox_card_interface(const machine_config &mconfig, device_t &device);
 	virtual void interface_config_complete() override;
 
-	peribox_slot_device *m_slot;        // using a link to the slot for callbacks
+	peribox_slot_device *m_slot = nullptr;        // using a link to the slot for callbacks
 	int m_senila;
 	int m_senilb;
 

src/devices/bus/ti99/peb/pgram.h

@@ -43,9 +43,9 @@ private:
 	void device_add_mconfig(machine_config &config) override;
 
 	// Settings
-	bool m_active;
+	bool m_active = false;
-	uint16_t m_crubase;
+	uint16_t m_crubase = 0;
-	bool m_pgramplus;
+	bool m_pgramplus = false;
 
 	ioport_constructor device_input_ports() const override;
 

src/devices/bus/ti99/peb/scsicard.h

@@ -61,13 +61,13 @@ private:
 	required_device<nscsi_bus_device> m_scsibus;
 
 	// DSR ROM
-	uint8_t* m_eprom;
+	uint8_t* m_eprom = nullptr;
 
 	// Recent address
-	int m_address;
+	int m_address = 0;
 
 	// Settings
-	int m_sw2;
+	int m_sw2 = 0;
 
 	// Latches for the lines
 	// Should be removed and accessor functions be added to ncr5380

src/devices/bus/ti99/peb/ti_fdc.h

@@ -87,7 +87,7 @@ private:
 	bool    m_inDsrArea;
 
 	// When true the CPU is halted while DRQ/IRQ are true.
-	bool    m_WAITena;
+	bool    m_WAITena = false;
 
 	// WD chip selected
 	bool    m_WDsel;
@@ -105,7 +105,7 @@ private:
 	uint8_t*  m_dsrrom;
 
 	// Link to the attached floppy drives
-	floppy_image_device*    m_floppy[3];
+	floppy_image_device*    m_floppy[3]{};
 
 	// Currently selected floppy drive
 	int  m_sel_floppy;

src/devices/bus/ti99/peb/tipi.h

@@ -64,23 +64,23 @@ private:
 	bool m_portaccess;
 
 	// DSR ROM
-	uint8_t* m_eprom;
+	uint8_t* m_eprom = nullptr;
 
 	// Websocket support
 	std::unique_ptr<webpp::ws_client> m_wsclient;
 	std::shared_ptr<webpp::ws_client::SendStream> m_send_stream;
 	std::unique_ptr<u8[]> m_rpimessage;
-	int m_msgindex;
+	int m_msgindex = 0;
-	int m_msglength;
+	int m_msglength = 0;
-	emu_timer* m_restart_timer;
+	emu_timer* m_restart_timer = nullptr;
-	int m_attempts;
+	int m_attempts = 0;
-	bool m_connected;
+	bool m_connected = 0;
 
 	// Computer interface
-	u8 m_tc;
+	u8 m_tc = 0;
-	u8 m_td;
+	u8 m_td = 0;
-	u8 m_rc;
+	u8 m_rc = 0;
-	u8 m_rd;
+	u8 m_rd = 0;
 };
 
 /*

src/devices/bus/ti99/peb/tn_ide.h

@@ -63,7 +63,7 @@ private:
 	int m_page;
 
 	// Is the SRAM buffered?
-	bool m_srammap;
+	bool m_srammap = false;
 
 	// RTC type
 	int m_rtctype;
@@ -77,7 +77,7 @@ private:
 
 	void decode(offs_t offset, bool& mmap, bool& sramsel, bool& xramsel, bool& rtcsel, bool& cs1fx, bool& cs3fx);
 
-	int m_rtc_int;
+	int m_rtc_int = 0;
 };
 
 } // end namespace bus::ti99::peb

src/devices/bus/tmc600/euro.h

@@ -91,7 +91,7 @@ protected:
 	// device-level overrides
 	virtual void device_start() override;
 
-	device_tmc600_eurobus_card_interface *m_card;
+	device_tmc600_eurobus_card_interface *m_card = nullptr;
 };
 
 

src/devices/bus/vcs/dpc.h

@@ -30,13 +30,13 @@ protected:
 	static constexpr device_timer_id TIMER_OSC = 0;
 
 	struct df_t {
-		uint8_t   top;
+		uint8_t   top = 0;
-		uint8_t   bottom;
+		uint8_t   bottom = 0;
-		uint8_t   low;
+		uint8_t   low = 0;
-		uint8_t   high;
+		uint8_t   high = 0;
-		uint8_t   flag;
+		uint8_t   flag = 0;
-		uint8_t   music_mode;     /* Only used by data fetchers 5,6, and 7 */
+		uint8_t   music_mode = 0;     /* Only used by data fetchers 5,6, and 7 */
-		uint8_t   osc_clk;        /* Only used by data fetchers 5,6, and 7 */
+		uint8_t   osc_clk = 0;        /* Only used by data fetchers 5,6, and 7 */
 	};
 
 	// device-level overrides

src/devices/bus/vme/vme.h

@@ -118,7 +118,7 @@ protected:
 
 	// callbacks
 	devcb_write_line        m_vme_j1_callback;
-	device_vme_card_interface *m_card;
+	device_vme_card_interface *m_card = nullptr;
 };
 
 DECLARE_DEVICE_TYPE(VME, vme_device)
@@ -195,12 +195,12 @@ protected:
 	virtual space_config_vector memory_space_config() const override;
 
 	// internal state
-	cpu_device   *m_maincpu;
+	cpu_device   *m_maincpu = nullptr;
 
 	// address spaces
-	address_space *m_prgspace;
+	address_space *m_prgspace = nullptr;
-	int m_prgwidth;
+	int m_prgwidth = 0;
-	bool m_allocspaces;
+	bool m_allocspaces = false;
 
 	const char                 *m_cputag;
 

src/devices/bus/vme/vme_cp31.h

@@ -46,11 +46,11 @@ private:
 
 	// Pointer to System ROMs needed by bootvect_r and masking RAM buffer for post reset accesses
 	memory_passthrough_handler m_rom_shadow_tap;
-	bool m_bus_error;
+	bool m_bus_error = false;
-	emu_timer *m_bus_error_timer;
+	emu_timer *m_bus_error_timer = nullptr;
 
-	uint8_t bim_irq_state;
+	uint8_t bim_irq_state = 0;
-	int bim_irq_level;
+	int bim_irq_level = 0;
 
 	DECLARE_WRITE_LINE_MEMBER(bim_irq_callback);
 	void update_irq_to_maincpu();

src/devices/bus/vme/vme_fccpu20.h

@@ -49,10 +49,10 @@ protected:
 	virtual void device_add_mconfig(machine_config &config) override;
 	virtual const tiny_rom_entry *device_rom_region() const override;
 
-	uint8_t bim_irq_state;
+	uint8_t bim_irq_state = 0;
-	int bim_irq_level;
+	int bim_irq_level = 0;
 
-	emu_timer *m_arbiter_start; // Need a startup delay because it is hooked up to the sense inputs of the PIT
+	emu_timer *m_arbiter_start = nullptr; // Need a startup delay because it is hooked up to the sense inputs of the PIT
 
 	required_device<cpu_device> m_maincpu;
 
@@ -78,7 +78,7 @@ private:
 	required_device<mpcc68561_device> m_mpcc3;
 
 	// Pointer to System ROMs needed by bootvect_r and masking RAM buffer for post reset accesses
-	uint32_t    *m_sysrom;
+	uint32_t    *m_sysrom = nullptr;
 	uint32_t    m_sysram[2];
 	void        update_irq_to_maincpu();
 	const fc_board_t  m_board_id;

src/devices/bus/vme/vme_fcisio.h

@@ -48,7 +48,7 @@ private:
 	required_device<bim68153_device> m_bim;
 
 	// Pointer to System ROMs needed by bootvect_r
-	uint16_t  *m_sysrom;
+	uint16_t  *m_sysrom = nullptr;
 };
 
 #endif // MAME_BUS_VME_VME_FCISIO_H

src/devices/bus/vme/vme_fcscsi.h

@@ -30,8 +30,8 @@ protected:
 
 	void update_irq_to_maincpu();
 
-	uint8_t fdc_irq_state;
+	uint8_t fdc_irq_state = 0;
-	uint8_t dmac_irq_state;
+	uint8_t dmac_irq_state = 0;
 
 private:
 	//dmac
@@ -66,7 +66,7 @@ private:
 	uint8_t m_tcr;
 
 	// Pointer to System ROMs needed by bootvect_r
-	uint16_t  *m_sysrom;
+	uint16_t  *m_sysrom = nullptr;
 };
 
 #endif // MAME_BUS_VME_VME_FCSCSI_H

src/devices/bus/vme/vme_hcpu30.h

@@ -62,13 +62,13 @@ private:
 
 	// Pointer to System ROMs needed by bootvect_r and masking RAM buffer for post reset accesses
 	memory_passthrough_handler m_rom_shadow_tap;
-	uint16_t    m_irq_state;
+	uint16_t    m_irq_state = 0;
-	uint16_t    m_irq_mask;
+	uint16_t    m_irq_mask = 0;
-	uint8_t     m_rtc_reg[16];
+	uint8_t     m_rtc_reg[16]{};
-	bool        m_rtc_hack;
+	bool        m_rtc_hack = false;
-	int         m_fdcdrq_hack;
+	int         m_fdcdrq_hack = 0;
-	bool        m_bus_error;
+	bool        m_bus_error = false;
-	emu_timer  *m_bus_error_timer;
+	emu_timer  *m_bus_error_timer = nullptr;
 
 	uint32_t irq_state_r(offs_t offset);
 	void irq_mask_w(offs_t offset, uint32_t data, uint32_t mem_mask = ~0);

src/devices/bus/vsmile/rom.h

@@ -31,7 +31,7 @@ protected:
 	virtual void device_start() override;
 	virtual void device_resolve_objects() override;
 
-	uint32_t m_bank_offset;
+	uint32_t m_bank_offset = 0;
 };
 
 

src/devices/bus/vtech/ioexp/ioexp.h

@@ -66,7 +66,7 @@ protected:
 private:
 	required_address_space m_iospace;
 
-	device_vtech_ioexp_interface *m_module;
+	device_vtech_ioexp_interface *m_module = nullptr;
 };
 
 // class representing interface-specific live ioexp device

src/devices/bus/vtech/memexp/memexp.h

@@ -89,7 +89,7 @@ private:
 	devcb_write_line m_nmi_handler;
 	devcb_write_line m_reset_handler;
 
-	device_vtech_memexp_interface *m_module;
+	device_vtech_memexp_interface *m_module = nullptr;
 };
 
 // class representing interface-specific live memexp device

src/devices/bus/wswan/rom.h

@@ -34,7 +34,7 @@ protected:
 
 	u16 m_io_regs[8];
 	u32 m_base20, m_base30, m_base40;
-	u32 m_rom_mask;
+	u32 m_rom_mask = 0;
 
 	// RTC
 	u8   m_rtc_setting;    /* Timer setting byte */
@@ -122,14 +122,14 @@ private:
 		READ_MODE = 0,
 		COMMAND_MODE
 	};
-	u8 m_flash_seq;
+	u8 m_flash_seq = 0;
-	u8 m_flash_command;
+	u8 m_flash_command = 0;
-	bool m_write_flash;
+	bool m_write_flash = false;
-	bool m_writing_flash;
+	bool m_writing_flash = false;
-	bool m_write_resetting;
+	bool m_write_resetting = false;
-	u8 m_flash_mode;
+	u8 m_flash_mode = 0;
-	u8 m_flash_status;
+	u8 m_flash_status = 0;
-	u8 m_flash_count;
+	u8 m_flash_count = 0;
 };