diff --git a/src/devices/cpu/lr35902/lr35902.cpp b/src/devices/cpu/lr35902/lr35902.cpp
index 59b8b45f601..452c96f3b8b 100644
--- a/src/devices/cpu/lr35902/lr35902.cpp
+++ b/src/devices/cpu/lr35902/lr35902.cpp
@@ -81,6 +81,7 @@ lr35902_cpu_device::lr35902_cpu_device(const machine_config &mconfig, const char
 	, m_IF(0)
 	, m_enable(0)
 	, m_has_halt_bug(false)
+	, m_dma_cycles_to_burn(0)
 	, m_entering_halt(false)
 	, m_timer_func(*this)
 	, m_incdec16_func(*this)
@@ -137,7 +138,6 @@ inline void lr35902_cpu_device::mem_write_word( uint16_t addr, uint16_t data )
 
 void lr35902_cpu_device::device_start()
 {
-	m_device = this;
 	m_program = &space(AS_PROGRAM);
 
 	// resolve callbacks
diff --git a/src/devices/cpu/lr35902/lr35902.h b/src/devices/cpu/lr35902/lr35902.h
index db950b6b48c..f723213137c 100644
--- a/src/devices/cpu/lr35902/lr35902.h
+++ b/src/devices/cpu/lr35902/lr35902.h
@@ -108,7 +108,6 @@ protected:
 	uint8_t m_IF;
 	int m_irq_state;
 	bool m_handle_ei_delay;
-	lr35902_cpu_device *m_device;
 	address_space *m_program;
 	int m_icount;
 
diff --git a/src/devices/machine/ds1994.cpp b/src/devices/machine/ds1994.cpp
index 5bd8a7024ca..c8da607c35c 100644
--- a/src/devices/machine/ds1994.cpp
+++ b/src/devices/machine/ds1994.cpp
@@ -53,6 +53,7 @@ ds1994_device::ds1994_device(const machine_config &mconfig, const char *tag, dev
 	, m_rx(false)
 	, m_tx(false)
 	, m_state_ptr(0)
+	, m_offs_ro(false)
 {
 	memset(m_ram, 0, sizeof(m_ram));
 }
diff --git a/src/devices/machine/tc009xlvc.cpp b/src/devices/machine/tc009xlvc.cpp
index a3553414d88..a98aa4a2ab4 100644
--- a/src/devices/machine/tc009xlvc.cpp
+++ b/src/devices/machine/tc009xlvc.cpp
@@ -118,6 +118,7 @@ void tc0091lvc_device::banked_map(address_map &map)
 tc0091lvc_device::tc0091lvc_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
 	: device_t(mconfig, TC0091LVC, tag, owner, clock)
 	, device_gfx_interface(mconfig, *this, gfxinfo, "palette")
+	, m_irq_enable(0)
 	, m_bankdev(*this, "bankdev_%u", 0U)
 	, m_vram(*this, "vram")
 	, m_bitmap_ram(*this, "bitmap_ram")
diff --git a/src/mame/drivers/at.cpp b/src/mame/drivers/at.cpp
index 8cf3b5d42b6..552d752ff94 100644
--- a/src/mame/drivers/at.cpp
+++ b/src/mame/drivers/at.cpp
@@ -645,7 +645,7 @@ void at_state::at486(machine_config &config)
 	maincpu.set_addrmap(AS_IO, &at_state::at32_io);
 	maincpu.set_irq_acknowledge_callback("mb:pic8259_master", FUNC(pic8259_device::inta_cb));
 
-		AT_MB(config, m_mb, 0).at_softlists(config);
+	AT_MB(config, m_mb, 0).at_softlists(config);
 
 	config.set_maximum_quantum(attotime::from_hz(60));
 
diff --git a/src/mame/drivers/megaphx.cpp b/src/mame/drivers/megaphx.cpp
index 03a671239c1..93f6de3af1c 100644
--- a/src/mame/drivers/megaphx.cpp
+++ b/src/mame/drivers/megaphx.cpp
@@ -438,7 +438,7 @@ ROM_START( megaphx )
 
 	ROM_REGION( 0x100000, "pic", 0 )
 	ROM_LOAD( "pic16c54-xt.bin", 0x000000, 0x430,  CRC(21f396fb) SHA1(c8badb9b3681e684bced0ced1de4c3a15641de8b) )
-	ROM_FILL(0x2c, 1, 0x01) // patch timer length or its too slow (pic issue?)
+	ROM_FILL(0x2c, 1, 0x01) // patch timer length or it's too slow (pic issue?)
 
 	ROM_REGION( 0x1000, "pals", 0 ) // protected
 	ROM_LOAD( "p31_u31_palce16v8h-25.jed", 0x000, 0xbd4, BAD_DUMP CRC(05ef04b7) SHA1(330dd81a832b6675fb0473868c26fe9bec2da854) )
@@ -469,7 +469,7 @@ ROM_START( hamboy )
 
 	ROM_REGION( 0x100000, "pic", 0 )
 	ROM_LOAD( "pic16c54-xt.bin", 0x000000, 0x430, CRC(21f396fb) SHA1(c8badb9b3681e684bced0ced1de4c3a15641de8b) )
-	ROM_FILL(0x2c, 1, 0x01) // patch timer length or its too slow (pic issue?)
+	ROM_FILL(0x2c, 1, 0x01) // patch timer length or it's too slow (pic issue?)
 ROM_END
 
 GAME( 1991, megaphx,  0,        megaphx, megaphx, megaphx_state, empty_init, ROT0, "Dinamic / Inder", "Mega Phoenix", MACHINE_IMPERFECT_GRAPHICS | MACHINE_IMPERFECT_SOUND )
diff --git a/src/mame/machine/inder_sb.cpp b/src/mame/machine/inder_sb.cpp
index 871c0e0df14..cd6465e1140 100644
--- a/src/mame/machine/inder_sb.cpp
+++ b/src/mame/machine/inder_sb.cpp
@@ -191,4 +191,6 @@ void inder_sb_device::device_start()
 
 void inder_sb_device::device_reset()
 {
+	m_soundsent = 0;
+	m_soundback = 0;
 }
diff --git a/src/mame/machine/taitosjsec.cpp b/src/mame/machine/taitosjsec.cpp
index dd5a6267812..cd8c5ce12c4 100644
--- a/src/mame/machine/taitosjsec.cpp
+++ b/src/mame/machine/taitosjsec.cpp
@@ -24,6 +24,7 @@ taito_sj_security_mcu_device::taito_sj_security_mcu_device(
 	, m_read_data(0U)
 	, m_zaccept(false)
 	, m_zready(false)
+	, m_pa_val(0U)
 	, m_pb_val(0U)
 	, m_busak(false)
 	, m_reset(false)