diff --git a/src/mame/drivers/nss.cpp b/src/mame/drivers/nss.cpp
index a8c6834e0f9..b8907a845aa 100644
--- a/src/mame/drivers/nss.cpp
+++ b/src/mame/drivers/nss.cpp
@@ -872,7 +872,7 @@ MACHINE_CONFIG_START(nss_state::nss)
 	MCFG_SCREEN_VBLANK_CALLBACK(WRITELINE(*this, nss_state, nss_vblank_irq))
 
 	MCFG_DEVICE_ADD("ppu", SNES_PPU, 0)
-	MCFG_SNES_PPU_OPENBUS_CB(READ8(*this, snes_state, snes_open_bus_r))
+	MCFG_SNES_PPU_OPENBUS_CB(READ8(*this, nss_state, snes_open_bus_r))
 	MCFG_VIDEO_SET_SCREEN("screen")
 
 	// NSS
diff --git a/src/mame/drivers/scv.cpp b/src/mame/drivers/scv.cpp
index 171e883f99c..04ace3d41e9 100644
--- a/src/mame/drivers/scv.cpp
+++ b/src/mame/drivers/scv.cpp
@@ -64,7 +64,6 @@ private:
 	required_ioport m_pc0;
 	required_memory_region m_charrom;
 
-	ioport_port *m_key[8];
 	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
 
 	inline void plot_sprite_part( bitmap_ind16 &bitmap, uint8_t x, uint8_t y, uint8_t pat, uint8_t col, uint8_t screen_sprite_start_line );
diff --git a/src/mame/drivers/sfcbox.cpp b/src/mame/drivers/sfcbox.cpp
index e45f566f8de..98c54a167ad 100644
--- a/src/mame/drivers/sfcbox.cpp
+++ b/src/mame/drivers/sfcbox.cpp
@@ -493,7 +493,7 @@ MACHINE_CONFIG_START(sfcbox_state::sfcbox)
 	MCFG_SCREEN_UPDATE_DRIVER( snes_state, screen_update )
 
 	MCFG_DEVICE_ADD("ppu", SNES_PPU, 0)
-	MCFG_SNES_PPU_OPENBUS_CB(READ8(*this, snes_state, snes_open_bus_r))
+	MCFG_SNES_PPU_OPENBUS_CB(READ8(*this, sfcbox_state, snes_open_bus_r))
 	MCFG_VIDEO_SET_SCREEN("screen")
 
 	// SFCBOX
diff --git a/src/mame/drivers/snes.cpp b/src/mame/drivers/snes.cpp
index 5ad6dd856f0..99fc2a521be 100644
--- a/src/mame/drivers/snes.cpp
+++ b/src/mame/drivers/snes.cpp
@@ -1353,7 +1353,7 @@ MACHINE_CONFIG_START(snes_console_state::snes)
 	MCFG_SCREEN_UPDATE_DRIVER( snes_state, screen_update )
 
 	MCFG_DEVICE_ADD("ppu", SNES_PPU, 0)
-	MCFG_SNES_PPU_OPENBUS_CB(READ8(*this, snes_state, snes_open_bus_r))
+	MCFG_SNES_PPU_OPENBUS_CB(READ8(*this, snes_console_state, snes_open_bus_r))
 	MCFG_VIDEO_SET_SCREEN("screen")
 
 	MCFG_SNES_CONTROL_PORT_ADD("ctrl1", snes_control_port_devices, "joypad")
diff --git a/src/mame/drivers/snesb.cpp b/src/mame/drivers/snesb.cpp
index baf6ec31bdf..6226babf68e 100644
--- a/src/mame/drivers/snesb.cpp
+++ b/src/mame/drivers/snesb.cpp
@@ -717,7 +717,7 @@ MACHINE_CONFIG_START(snesb_state::kinstb)
 	MCFG_SCREEN_UPDATE_DRIVER( snes_state, screen_update )
 
 	MCFG_DEVICE_ADD("ppu", SNES_PPU, 0)
-	MCFG_SNES_PPU_OPENBUS_CB(READ8(*this, snes_state, snes_open_bus_r))
+	MCFG_SNES_PPU_OPENBUS_CB(READ8(*this, snesb_state, snes_open_bus_r))
 	MCFG_VIDEO_SET_SCREEN("screen")
 
 	/* sound hardware */
diff --git a/src/mame/drivers/swyft.cpp b/src/mame/drivers/swyft.cpp
index 4cb7c1cbc46..50a790ad4f3 100644
--- a/src/mame/drivers/swyft.cpp
+++ b/src/mame/drivers/swyft.cpp
@@ -371,9 +371,6 @@ private:
 
 	DECLARE_WRITE_LINE_MEMBER(write_acia_clock);
 
-	uint8_t m_keyboard_line;
-	uint8_t m_floppy_control;
-
 	void swyft_mem(address_map &map);
 
 	//virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
diff --git a/src/mame/drivers/taitotz.cpp b/src/mame/drivers/taitotz.cpp
index 90e2e5b92da..bc33331eaa2 100644
--- a/src/mame/drivers/taitotz.cpp
+++ b/src/mame/drivers/taitotz.cpp
@@ -590,7 +590,7 @@ private:
 	uint32_t m_video_reg;
 	uint32_t m_scr_base;
 
-	uint64_t m_video_fifo_mem[4];
+	//uint64_t m_video_fifo_mem[4];
 
 	uint16_t m_io_share_ram[0x2000];
 
@@ -605,7 +605,6 @@ private:
 
 
 	uint32_t m_reg105;
-	int m_count;
 
 	std::unique_ptr<taitotz_renderer> m_renderer;
 
diff --git a/src/mame/drivers/voyager.cpp b/src/mame/drivers/voyager.cpp
index 94281c7b4d2..e15ca551947 100644
--- a/src/mame/drivers/voyager.cpp
+++ b/src/mame/drivers/voyager.cpp
@@ -55,7 +55,6 @@ private:
 	uint8_t m_mtxc_config_reg[256];
 	uint8_t m_piix4_config_reg[4][256];
 
-	uint32_t m_idle_skip_ram;
 	DECLARE_WRITE32_MEMBER(bios_ram_w);
 
 	virtual void machine_start() override;
diff --git a/src/mame/includes/tdv2324.h b/src/mame/includes/tdv2324.h
index 634415d962a..79bde97bacb 100644
--- a/src/mame/includes/tdv2324.h
+++ b/src/mame/includes/tdv2324.h
@@ -78,9 +78,6 @@ private:
 	DECLARE_READ8_MEMBER( tdv2324_main_io_e6 );
 	DECLARE_WRITE8_MEMBER( tdv2324_main_io_e2 );
 
-	uint8_t m_sub_status;
-	uint8_t m_sub_data;
-
 	// video state
 	required_shared_ptr<uint8_t> m_video_ram;
 	void tdv2324_fdc_mem(address_map &map);
diff --git a/src/mame/includes/tek405x.h b/src/mame/includes/tek405x.h
index 9a73e8022d9..b9420af40b3 100644
--- a/src/mame/includes/tek405x.h
+++ b/src/mame/includes/tek405x.h
@@ -146,7 +146,6 @@ private:
 	int m_acia_irq;
 
 	// keyboard
-	int m_kbhalt;
 	int m_kc;
 
 	// GPIB
diff --git a/src/mame/includes/tmc2000e.h b/src/mame/includes/tmc2000e.h
index 5e0b84beb41..430517669fc 100644
--- a/src/mame/includes/tmc2000e.h
+++ b/src/mame/includes/tmc2000e.h
@@ -59,7 +59,6 @@ private:
 
 	/* keyboard state */
 	int m_keylatch;         /* key latch */
-	int m_reset;            /* reset activated */
 	void tmc2000e_io_map(address_map &map);
 	void tmc2000e_map(address_map &map);