Addressed a few coverity concerns.

src/mame/drivers/a5105.cpp

@@ -86,9 +86,9 @@ private:
 	void a5105_mem(address_map &map);
 	void upd7220_map(address_map &map);
 
-	uint8_t *m_ram_base;
-	uint8_t *m_rom_base;
-	uint8_t *m_char_ram;
+	uint8_t *m_ram_base = 0;
+	uint8_t *m_rom_base = 0;
+	uint8_t *m_char_ram = 0;
 	uint16_t m_pcg_addr = 0U;
 	uint16_t m_pcg_internal_addr = 0U;
 	uint8_t m_key_mux = 0U;

src/mame/drivers/a7150.cpp

@@ -91,9 +91,9 @@ private:
 	void kbd_put(uint8_t data);
 	void kgs_memory_remap();
 
-	bool m_kgs_msel, m_kgs_iml;
-	uint8_t m_kgs_datao, m_kgs_datai, m_kgs_ctrl;
-	bool m_ifss_loopback;
+	bool m_kgs_msel = 0, m_kgs_iml = 0;
+	uint8_t m_kgs_datao = 0, m_kgs_datai = 0, m_kgs_ctrl = 0;
+	bool m_ifss_loopback = 0;
 
 	uint32_t screen_update_k7072(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
 	void screen_eof(screen_device &screen, bool state);

src/mame/drivers/ac1.cpp

@@ -53,7 +53,7 @@ private:
 	u32 screen_update_ac1_32(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
 	u8 ac1_port_b_r();
 	u8 ac1_port_a_r();
-	bool has_lowercase;
+	bool has_lowercase = 0;
 	void machine_start() override;
 	void ac1_port_a_w(u8 data);
 	void ac1_port_b_w(u8 data);

src/mame/drivers/altos5.cpp

@@ -73,7 +73,7 @@ private:
 	uint8_t m_port09 = 0U;
 	bool m_ipl = 0;
 	offs_t m_curr_bank = 0;
-	floppy_image_device *m_floppy;
+	floppy_image_device *m_floppy = 0;
 	std::unique_ptr<u8[]> m_ram;  // main ram 192k
 	std::unique_ptr<u8[]> m_dummy;  // for wrpt
 	required_device<z80_device> m_maincpu;

src/mame/drivers/apogee.cpp

@@ -36,9 +36,9 @@ public:
 	void apogee(machine_config &config);
 
 private:
-	uint8_t m_out0;
-	uint8_t m_out1;
-	uint8_t m_out2;
+	uint8_t m_out0 = 0U;
+	uint8_t m_out1 = 0U;
+	uint8_t m_out2 = 0U;
 	DECLARE_WRITE_LINE_MEMBER(pit8253_out0_changed);
 	DECLARE_WRITE_LINE_MEMBER(pit8253_out1_changed);
 	DECLARE_WRITE_LINE_MEMBER(pit8253_out2_changed);

src/mame/drivers/bmjr.cpp

@@ -51,11 +51,11 @@ private:
 	void xor_display_w(u8 data);
 	u32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
 	void mem_map(address_map &map);
-	bool m_tape_switch;
-	u8 m_xor_display;
-	u8 m_key_mux;
-	u16 m_casscnt;
-	bool m_cassold, m_cassbit;
+	bool m_tape_switch = 0;
+	u8 m_xor_display = 0U;
+	u8 m_key_mux = 0U;
+	u16 m_casscnt = 0U;
+	bool m_cassold = 0, m_cassbit = 0;
 	TIMER_DEVICE_CALLBACK_MEMBER(kansas_r);
 	virtual void machine_start() override;
 	virtual void machine_reset() override;

src/mame/drivers/homez80.cpp

@@ -2,21 +2,21 @@
 // copyright-holders:Miodrag Milanovic
 /***************************************************************************
 
-        Homebrew Z80 Computer by Kun-Szabo Marton
+Homebrew Z80 Computer by Kun-Szabo Marton
 
-            http://digitarworld.uw.hu/z80.htm
+http://digitarworld.uw.hu/z80.htm
 
-        31/10/2010 Initial driver by Miodrag Milanovic
+2010-10-31 Initial driver by Miodrag Milanovic
 
-        All commands must be entered in uppercase, and since the capslock
-        doesn't work, you need to hold the shift key down.
+All commands must be entered in uppercase, and since the capslock
+ doesn't work, you need to hold the shift key down.
 
-        There is next to no error checking, for example the T command
-        is to set the time. Entering T by itself will set the time to
-        99:99:99, while G will cause a jump to 9999 and so forth. Also
-        the parameter must be right next to the command, spaces will cause
-        invalid input. Example M1234 will display a byte of memory at 1234,
-        while M 1234 will display memory at 9123.
+There is next to no error checking, for example the T command
+ is to set the time. Entering T by itself will set the time to
+ 99:99:99, while G will cause a jump to 9999 and so forth. Also
+ the parameter must be right next to the command, spaces will cause
+ invalid input. Example M1234 will display a byte of memory at 1234,
+ while M 1234 will display memory at 9123.
 
 ****************************************************************************/
 
@@ -47,7 +47,7 @@ private:
 
 	void mem_map(address_map &map);
 
-	bool m_irq;
+	bool m_irq = 0;
 	void machine_reset() override;
 	void machine_start() override;
 	required_device<cpu_device> m_maincpu;

src/mame/drivers/junior80.cpp

@@ -165,7 +165,7 @@ private:
 
 	void drive_w(offs_t offset, u8 data);
 
-	floppy_image_device *m_floppy;
+	floppy_image_device *m_floppy = 0;
 	required_device<cpu_device> m_maincpu;
 	required_device<z80ctc_device> m_ctc;
 	required_device<i8257_device> m_dma;

src/mame/drivers/jupiter.cpp

@@ -101,7 +101,7 @@ private:
 	void jupiter3_io(address_map &map);
 	void jupiter3_mem(address_map &map);
 
-	uint8_t m_term_data;
+	uint8_t m_term_data = 0U;
 	required_device<cpu_device> m_maincpu;
 	required_shared_ptr<uint8_t> m_p_videoram;
 	required_shared_ptr<uint8_t> m_p_ram;

src/mame/drivers/k1003.cpp

@@ -54,9 +54,9 @@ private:
 	void io_map(address_map &map);
 	void mem_map(address_map &map);
 
-	uint8_t m_disp_1;
-	uint8_t m_disp_2;
-	u8 m_digit;
+	uint8_t m_disp_1 = 0U;
+	uint8_t m_disp_2 = 0U;
+	u8 m_digit = 0U;
 	uint8_t bit_to_dec(uint8_t val);
 	void machine_start() override;
 	required_device<cpu_device> m_maincpu;

src/mame/drivers/kramermc.cpp

@@ -80,7 +80,7 @@ public:
 	void init_kramermc();
 
 private:
-	u8 m_porta;
+	u8 m_porta = 0U;
 	virtual void machine_start() override;
 	virtual void machine_reset() override;
 	uint32_t screen_update_kramermc(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);

src/mame/drivers/max80.cpp

@@ -131,7 +131,7 @@ private:
 	bool m_fdc_int = 0;
 	bool m_allow_nmi = 0;
 	u8 m_mode = 0U;
-	floppy_image_device *m_floppy;
+	floppy_image_device *m_floppy = 0;
 	required_device<cpu_device> m_maincpu;
 	//required_region_ptr<u8> m_p_chargen;
 	//required_shared_ptr<u8> m_p_vram;

src/mame/drivers/mccpm.cpp

@@ -65,7 +65,7 @@ private:
 	template <int N> void bd_q_w(offs_t offset, u8 data);
 
 	u8 m_fdc_status = 0U;
-	floppy_image_device *m_floppy;
+	floppy_image_device *m_floppy = 0;
 
 	required_device<cpu_device> m_maincpu;
 	required_device<address_map_bank_device> m_bank;

src/mame/drivers/micromon.cpp

@@ -40,7 +40,7 @@ private:
 	void mem_map(address_map &map);
 
 	virtual void machine_reset() override;
-	uint8_t m_resetcnt;
+	uint8_t m_resetcnt = 0U;
 	required_device<cosmac_device> m_maincpu;
 };
 

src/mame/drivers/mkit09.cpp

@@ -66,7 +66,7 @@ public:
 protected:
 	u8 pa_r();
 	u8 pb_r();
-	u8 m_digit;
+	u8 m_digit = 0U;
 	u8 m_seg = 0U;
 	void machine_reset() override;
 	void machine_start() override;

src/mame/drivers/mod8.cpp

@@ -78,9 +78,9 @@ private:
 	void io_map(address_map &map);
 	void mem_map(address_map &map);
 
-	uint16_t m_tty_data_out;
-	uint8_t m_tty_data_in;
-	int m_tty_cnt;
+	uint16_t m_tty_data_out = 0U;
+	uint8_t m_tty_data_in = 0U;
+	int m_tty_cnt = 0;
 	void machine_start() override;
 	required_device<teleprinter_device> m_teleprinter;
 	required_device<cpu_device> m_maincpu;

src/mame/drivers/pes.cpp

@@ -82,8 +82,8 @@ public:
 
 private:
 
-	u8 m_term_data;
-	u8 m_port3;
+	u8 m_term_data = 0U;
+	u8 m_port3 = 0U;
 	virtual void machine_reset() override;
 	void port3_w(u8 data);
 	u8 port3_r();

src/mame/drivers/rotaryf.cpp

@@ -52,8 +52,8 @@ private:
 	void portc_w(uint8_t data);
 	void port30_w(uint8_t data);
 
-	bool m_flipscreen;
-	uint8_t m_last;
+	bool m_flipscreen = 0;
+	uint8_t m_last = 0U;
 
 	virtual void machine_start() override;
 

src/mame/drivers/s6.cpp

@@ -123,7 +123,7 @@ private:
 	u8 m_row = 0;
 	bool m_data_ok = 0;
 	u8 m_lamp_data = 0;
-	emu_timer* m_irq_timer;
+	emu_timer* m_irq_timer = 0;
 	static const device_timer_id TIMER_IRQ = 0;
 	required_device<cpu_device> m_maincpu;
 	required_device<williams_s6_sound_device> m_s6sound;

src/mame/drivers/sm1800.cpp

@@ -48,7 +48,7 @@ private:
 	void portc_w(uint8_t data);
 	uint8_t porta_r();
 	uint8_t portc_r();
-	uint8_t m_irq_state;
+	uint8_t m_irq_state = 0U;
 	void machine_start() override;
 	void sm1800_palette(palette_device &palette) const;
 	INTERRUPT_GEN_MEMBER(vblank_interrupt);

src/mame/drivers/squale.cpp

@@ -152,13 +152,13 @@ private:
 	virtual void machine_start() override;
 	virtual void machine_reset() override;
 
-	uint8_t keyboard_line;
-	uint8_t fdc_sel0;
-	uint8_t fdc_sel1;
+	uint8_t keyboard_line = 0U;
+	uint8_t fdc_sel0 = 0U;
+	uint8_t fdc_sel1 = 0U;
 
-	uint8_t  cart_addr_counter_inc_ck;
-	uint8_t  cart_addr_counter_reset;
-	uint16_t cart_addr_counter;
+	uint8_t  cart_addr_counter_inc_ck = 0U;
+	uint8_t  cart_addr_counter_reset = 0U;
+	uint16_t cart_addr_counter = 0U;
 
 	TIMER_DEVICE_CALLBACK_MEMBER(squale_scanline);
 
@@ -176,7 +176,7 @@ private:
 	floppy_image_device *m_floppy;
 	required_device<generic_slot_device> m_cart;
 
-	memory_region *m_cart_rom;
+	memory_region *m_cart_rom = 0;
 };
 
 /*****************************************

src/mame/drivers/techno.cpp

@@ -91,8 +91,8 @@ private:
 	output_finder<48> m_digits;
 	output_finder<96> m_io_outputs;   // 64 lamps + 32 solenoids
 
-	emu_timer *m_irq_set_timer;
-	emu_timer *m_irq_advance_timer;
+	emu_timer *m_irq_set_timer = 0;
+	emu_timer *m_irq_advance_timer = 0;
 
 	bool m_digwait = 0;
 	u8 m_keyrow = 0U;

src/mame/drivers/tm990189.cpp

@@ -142,7 +142,7 @@ private:
 	DECLARE_MACHINE_START(tm990_189_v);
 	DECLARE_MACHINE_RESET(tm990_189_v);
 
-	emu_timer *m_rs232_input_timer;
+	emu_timer *m_rs232_input_timer = 0;
 
 	void tm990_189_cru_map(address_map &map);
 	void tm990_189_memmap(address_map &map);
@@ -172,15 +172,15 @@ private:
 
 	int m_digitsel = 0;
 	int m_segment = 0;
-	emu_timer *m_displayena_timer;
+	emu_timer *m_displayena_timer = 0;
 	uint8_t m_segment_state[10]{};
 	uint8_t m_old_segment_state[10]{};
 	uint8_t m_LED_state = 0U;
-	emu_timer *m_joy1x_timer;
-	emu_timer *m_joy1y_timer;
-	emu_timer *m_joy2x_timer;
-	emu_timer *m_joy2y_timer;
-	device_image_interface *m_rs232_fp;
+	emu_timer *m_joy1x_timer = 0;
+	emu_timer *m_joy1y_timer = 0;
+	emu_timer *m_joy2x_timer = 0;
+	emu_timer *m_joy2y_timer = 0;
+	device_image_interface *m_rs232_fp = 0;
 	//uint8_t m_rs232_rts;
 	uint8_t m_bogus_read_save = 0U;
 };