init vars for coverity (drivers/q,r)

src/mame/drivers/quizshow.cpp

@@ -95,11 +95,11 @@ private:
 	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
 	TIMER_DEVICE_CALLBACK_MEMBER(clock_timer_cb);
 
-	tilemap_t *m_tilemap;
-	uint32_t m_clocks;
-	int m_blink_state;
-	int m_category_enable;
-	int m_tape_head_pos;
+	tilemap_t *m_tilemap = nullptr;
+	uint32_t m_clocks = 0;
+	int m_blink_state = 0;
+	int m_category_enable = 0;
+	int m_tape_head_pos = 0;
 };
 
 

src/mame/drivers/qx10.cpp

@@ -186,33 +186,33 @@ private:
 	required_device<palette_device> m_palette;
 
 	/* FDD */
-	int     m_fdcint;
-	uint8_t  m_motor_clk;
-	uint16_t m_counter;
-	//int     m_fdcready;
+	int     m_fdcint = 0;
+	uint8_t  m_motor_clk = 0;
+	uint16_t m_counter = 0;
+	//int     m_fdcready = 0;
 
-	int m_spkr_enable;
-	int m_spkr_freq;
-	int m_pit1_out0;
+	int m_spkr_enable = 0;
+	int m_spkr_freq = 0;
+	int m_pit1_out0 = 0;
 
 	/* centronics */
-	int m_centronics_error;
-	int m_centronics_busy;
-	int m_centronics_paper;
-	int m_centronics_select;
-	int m_centronics_sense;
+	int m_centronics_error = 0;
+	int m_centronics_busy = 0;
+	int m_centronics_paper = 0;
+	int m_centronics_select = 0;
+	int m_centronics_sense = 0;
 
 
 	/* memory */
 	memory_view m_ram_view;
-	int     m_external_bank;
-	int     m_membank;
-	int     m_memprom;
-	int     m_memcmos;
-	uint8_t   m_cmosram[0x800];
+	int     m_external_bank = 0;
+	int     m_membank = 0;
+	int     m_memprom = 0;
+	int     m_memcmos = 0;
+	uint8_t   m_cmosram[0x800]{};
 
-	uint8_t m_color_mode;
-	uint8_t m_zoom;
+	uint8_t m_color_mode = 0;
+	uint8_t m_zoom = 0;
 };
 
 UPD7220_DISPLAY_PIXELS_MEMBER( qx10_state::hgdc_display_pixels )

src/mame/drivers/r2dtank.cpp

@@ -94,9 +94,9 @@ private:
 	required_device<ay8910_device> m_ay1;
 	required_device<ay8910_device> m_ay2;
 
-	uint8_t m_flipscreen;
-	uint32_t m_ttl74123_output;
-	uint8_t m_AY8910_selected;
+	uint8_t m_flipscreen = 0;
+	uint32_t m_ttl74123_output = 0;
+	uint8_t m_AY8910_selected = 0;
 
 	uint8_t audio_command_r();
 	void audio_command_w(uint8_t data);

src/mame/drivers/r9751.cpp

@@ -128,19 +128,19 @@ private:
 	required_device<wd33c93_device> m_wd33c93;
 	required_shared_ptr<uint32_t> m_main_ram;
 
-	m68000_base_device* ptr_m68000;
+	m68000_base_device* ptr_m68000 = nullptr;
 
 	// Begin registers
-	uint32_t reg_ff050004;
-	uint32_t reg_fff80040;
-	uint32_t fdd_dest_address; // 5FF080B0
-	uint32_t fdd_cmd_complete;
-	uint32_t smioc_dma_bank;
-	uint32_t fdd_dma_bank;
+	uint32_t reg_ff050004 = 0;
+	uint32_t reg_fff80040 = 0;
+	uint32_t fdd_dest_address = 0; // 5FF080B0
+	uint32_t fdd_cmd_complete = 0;
+	uint32_t smioc_dma_bank = 0;
+	uint32_t fdd_dma_bank = 0;
 	attotime timer_32khz_last;
 	// End registers
 
-	address_space *m_mem;
+	address_space *m_mem = nullptr;
 
 	// functions
 	uint32_t swap_uint32( uint32_t val );

src/mame/drivers/rabbit.cpp

@@ -154,12 +154,12 @@ private:
 
 	std::unique_ptr<bitmap_ind16> m_sprite_bitmap;
 	rectangle m_sprite_clip;
-	int m_vblirqlevel;
-	int m_bltirqlevel;
-	int m_banking;
+	int m_vblirqlevel = 0;
+	int m_bltirqlevel = 0;
+	int m_banking = 0;
 	std::unique_ptr<uint32_t[]> m_tilemap_ram[4];
-	tilemap_t *m_tilemap[4];
-	emu_timer *m_blit_done_timer;
+	tilemap_t *m_tilemap[4]{};
+	emu_timer *m_blit_done_timer = nullptr;
 
 	TILE_GET_INFO_MEMBER(get_tilemap0_tile_info);
 	TILE_GET_INFO_MEMBER(get_tilemap1_tile_info);

src/mame/drivers/rambo.cpp

@@ -44,7 +44,7 @@ private:
 	void rambo_prg_map(address_map &map);
 	void rambo_data_map(address_map &map);
 
-	uint8_t m_port_a;
+	uint8_t m_port_a = 0;
 	required_device<avr8_device> m_maincpu;
 };
 

src/mame/drivers/rastersp.cpp

@@ -137,11 +137,11 @@ private:
 	DECLARE_WRITE_LINE_MEMBER(vblank_irq);
 
 	std::unique_ptr<uint8_t[]>   m_nvram8;
-	uint8_t   m_irq_status;
-	uint32_t  m_dpyaddr;
+	uint8_t   m_irq_status = 0;
+	uint32_t  m_dpyaddr = 0;
 	std::unique_ptr<uint16_t[]> m_paletteram;
-	uint32_t  m_speedup_count;
-	uint32_t  m_tms_io_regs[0x80];
+	uint32_t  m_speedup_count = 0;
+	uint32_t  m_tms_io_regs[0x80]{};
 	bitmap_ind16 m_update_bitmap;
 
 	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);

src/mame/drivers/rbmk.cpp

@@ -103,9 +103,9 @@ private:
 	required_device<ym2151_device> m_ymsnd;
 	required_ioport_array<3> m_dsw;
 
-	uint16_t m_tilebank;
-	uint8_t m_mux_data;
-	uint16_t m_dip_mux;
+	uint16_t m_tilebank = 0;
+	uint8_t m_mux_data = 0;
+	uint16_t m_dip_mux = 0;
 
 	void mcu_io(address_map &map);
 	void mcu_mem(address_map &map);

src/mame/drivers/rd100.cpp

@@ -56,9 +56,9 @@ private:
 	required_ioport_array<9> m_keys;
 	required_device<pia6821_device> m_pia1;
 
-	uint8_t m_key_scan;
-	bool m_shift;
-	bool m_ctrl;
+	uint8_t m_key_scan = 0;
+	bool m_shift = false;
+	bool m_ctrl = false;
 };
 
 

src/mame/drivers/re900.cpp

@@ -125,12 +125,12 @@ private:
 	required_device<cpu_device> m_maincpu;
 
 	// re900 specific
-	uint8_t m_psg_pa;
-	uint8_t m_psg_pb;
-	uint8_t m_mux_data;
-	uint8_t m_ledant;
-	uint8_t m_player;
-	uint8_t m_stat_a;
+	uint8_t m_psg_pa = 0;
+	uint8_t m_psg_pb = 0;
+	uint8_t m_mux_data = 0;
+	uint8_t m_ledant = 0;
+	uint8_t m_player = 0;
+	uint8_t m_stat_a = 0;
 	output_finder<84> m_lamps;
 };
 

src/mame/drivers/rex6000.cpp

@@ -168,7 +168,7 @@ public:
 private:
 	int oz_wzd_extract_tag(const std::vector<uint8_t> &data, const char *tag, char *dest_buf);
 
-	uint16_t m_kb_mask;
+	uint16_t m_kb_mask = 0;
 };
 
 

src/mame/drivers/rgum.cpp

@@ -63,9 +63,9 @@ private:
 	required_device<upd7759_device> m_upd;
 	required_device<gfxdecode_device> m_gfxdecode;
 	required_device<palette_device> m_palette;
-	uint8_t m_hbeat;
-	bool m_aysnd_data_next;
-	bool m_aysnd_toggle_enabled;
+	uint8_t m_hbeat = 0;
+	bool m_aysnd_data_next = false;
+	bool m_aysnd_toggle_enabled = false;
 
 	void aysnd_2000_w(uint8_t data);
 	void aysnd_2002_w(uint8_t data);

src/mame/drivers/riscpc.cpp

@@ -66,7 +66,7 @@ private:
 	void a7000_map(address_map &map);
 	void riscpc_map(address_map &map);
 
-	bool m_i2cmem_clock;
+	bool m_i2cmem_clock = false;
 	DECLARE_READ_LINE_MEMBER(iocr_od0_r);
 	DECLARE_READ_LINE_MEMBER(iocr_od1_r);
 	DECLARE_WRITE_LINE_MEMBER(iocr_od0_w);

src/mame/drivers/rmhaihai.cpp

@@ -82,9 +82,9 @@ protected:
 
 	required_ioport_array<2> m_key;
 
-	tilemap_t *m_bg_tilemap;
-	uint8_t m_keyboard_cmd;
-	uint8_t m_gfxbank;
+	tilemap_t *m_bg_tilemap = nullptr;
+	uint8_t m_keyboard_cmd = 0;
+	uint8_t m_gfxbank = 0;
 };
 
 

src/mame/drivers/roland_d10.cpp

@@ -93,11 +93,11 @@ private:
 	void d110_map(address_map &map);
 	void d110_bank_map(address_map &map);
 
-	uint8_t  m_lcd_data_buffer[256];
-	int      m_lcd_data_buffer_pos;
-	uint8_t  m_midi;
-	int      m_midi_pos;
-	uint8_t  m_port0;
+	uint8_t  m_lcd_data_buffer[256]{};
+	int      m_lcd_data_buffer_pos = 0;
+	uint8_t  m_midi = 0;
+	int      m_midi_pos = 0;
+	uint8_t  m_port0 = 0;
 	required_device<address_map_bank_device> m_bank;
 	required_device<nvram_device> m_rams;
 	required_device<nvram_device> m_memcs;

src/mame/drivers/roland_mt32.cpp

@@ -224,11 +224,11 @@ private:
 
 	void mt32_map(address_map &map);
 
-	uint8_t lcd_data_buffer[256];
-	int lcd_data_buffer_pos;
-	uint8_t midi;
-	int midi_pos;
-	uint8_t port0;
+	uint8_t lcd_data_buffer[256]{};
+	int lcd_data_buffer_pos = 0;
+	uint8_t midi = 0;
+	int midi_pos = 0;
+	uint8_t port0 = 0;
 };
 
 mt32_state::mt32_state(const machine_config &mconfig, device_type type, const char *tag) :

src/mame/drivers/rollext.cpp

@@ -183,7 +183,7 @@ private:
 
 	int m_fb_current;
 
-	uint8_t *m_texture_ram;
+	uint8_t *m_texture_ram = nullptr;
 };
 
 template<bool UseZ>

src/mame/drivers/roul.cpp

@@ -112,7 +112,7 @@ private:
 
 	uint8_t m_reg[0x10];
 	std::unique_ptr<uint8_t[]> m_videobuf;
-	uint8_t m_lamp_old;
+	uint8_t m_lamp_old = 0;
 };
 
 

src/mame/drivers/route16.cpp

@@ -191,7 +191,7 @@ private:
 	required_device<sn76477_device> m_sn;
 	required_device<dac_byte_interface> m_dac;
 
-	int m_speakres_vrx;
+	int m_speakres_vrx = 0;
 };
 
 

src/mame/drivers/rtpc.cpp

@@ -195,19 +195,19 @@ protected:
 
 	required_region_ptr<u32> m_ipl;
 
-	u8 m_mcu_p0;
-	u8 m_mcu_p1;
-	u8 m_mcu_p2;
-	u8 m_mcu_p3;
+	u8 m_mcu_p0 = 0;
+	u8 m_mcu_p1 = 0;
+	u8 m_mcu_p2 = 0;
+	u8 m_mcu_p3 = 0;
 
-	u8 m_ppi_pb;
-	u8 m_mcu_uart;
+	u8 m_ppi_pb = 0;
+	u8 m_mcu_uart = 0;
 
-	u8 m_ch8er; // dma channel 8 enable register
-	u8 m_crra; // component reset register a
-	u8 m_crrb; // component reset register b
+	u8 m_ch8er = 0; // dma channel 8 enable register
+	u8 m_crra = 0; // component reset register a
+	u8 m_crrb = 0; // component reset register b
 
-	u8 m_ext[2]; // external serial registers
+	u8 m_ext[2]{}; // external serial registers
 };
 
 static double const speaker_levels[4] = { 0.0, 1.0 / 3.0, 2.0 / 3.0, 1.0 };

src/mame/drivers/runaway.cpp

@@ -101,7 +101,7 @@ private:
 
 	required_device<er2055_device> m_earom;
 
-	uint8_t m_tile_bank;
+	uint8_t m_tile_bank = 0;
 };