diff --git a/src/mame/drivers/ibmpcjr.cpp b/src/mame/drivers/ibmpcjr.cpp
index 109f8606bb1..240133d0879 100644
--- a/src/mame/drivers/ibmpcjr.cpp
+++ b/src/mame/drivers/ibmpcjr.cpp
@@ -628,7 +628,7 @@ MACHINE_CONFIG_START(pcjr_state::ibmpcjr)
 	MCFG_RS232_CTS_HANDLER(WRITELINE("ins8250", ins8250_uart_device, cts_w))
 
 	/* video hardware */
-	MCFG_PCVIDEO_PCJR_ADD("pcvideo_pcjr")
+	MCFG_DEVICE_ADD("pcvideo_pcjr", PCVIDEO_PCJR, 0)
 	MCFG_VIDEO_SET_SCREEN("pcvideo_pcjr:screen")
 
 	MCFG_DEVICE_ADD("gfxdecode", GFXDECODE, "pcvideo_pcjr:palette", gfx_pcjr)
diff --git a/src/mame/drivers/mz700.cpp b/src/mame/drivers/mz700.cpp
index aa49256728b..55ccf7ffe34 100644
--- a/src/mame/drivers/mz700.cpp
+++ b/src/mame/drivers/mz700.cpp
@@ -83,7 +83,6 @@
 #include "includes/mz700.h"
 
 #include "cpu/z80/z80.h"
-#include "machine/74145.h"
 #include "sound/sn76496.h"
 #include "sound/wave.h"
 
@@ -99,7 +98,7 @@
 
 TIMER_DEVICE_CALLBACK_MEMBER(mz_state::ne556_cursor_callback)
 {
-	m_cursor_timer ^= 1;
+	m_cursor_bit ^= 1;
 }
 
 TIMER_DEVICE_CALLBACK_MEMBER(mz_state::ne556_other_callback)
diff --git a/src/mame/drivers/tandy1t.cpp b/src/mame/drivers/tandy1t.cpp
index d9bf6c9bf88..6ae120166e9 100644
--- a/src/mame/drivers/tandy1t.cpp
+++ b/src/mame/drivers/tandy1t.cpp
@@ -651,7 +651,7 @@ MACHINE_CONFIG_START(tandy1000_state::tandy1000_common)
 	downcast<t1000_mb_device &>(*device).set_cputag("maincpu");
 
 	/* video hardware */
-	MCFG_PCVIDEO_T1000_ADD("pcvideo_t1000")
+	MCFG_DEVICE_ADD("pcvideo_t1000", PCVIDEO_T1000, 0)
 	MCFG_VIDEO_SET_SCREEN("pcvideo_t1000:screen")
 	MCFG_DEVICE_ADD("gfxdecode", GFXDECODE, "pcvideo_t1000:palette", gfx_t1000)
 
diff --git a/src/mame/drivers/toaplan1.cpp b/src/mame/drivers/toaplan1.cpp
index 6cde6c5486b..26c29eb323e 100644
--- a/src/mame/drivers/toaplan1.cpp
+++ b/src/mame/drivers/toaplan1.cpp
@@ -613,7 +613,6 @@ Stephh's and AWJ's notes (based on the games M68000 and Z80 code and some tests)
 #include "cpu/z80/z80.h"
 #include "cpu/z180/z180.h"
 #include "machine/74259.h"
-#include "sound/3812intf.h"
 #include "speaker.h"
 
 
diff --git a/src/mame/includes/mz700.h b/src/mame/includes/mz700.h
index fb499e9d70e..348499a7506 100644
--- a/src/mame/includes/mz700.h
+++ b/src/mame/includes/mz700.h
@@ -13,6 +13,7 @@
 #include "bus/centronics/ctronics.h"
 #include "imagedev/cassette.h"
 #include "machine/bankdev.h"
+#include "machine/74145.h"
 #include "machine/i8255.h"
 #include "machine/pit8253.h"
 #include "machine/ram.h"
@@ -37,6 +38,8 @@ public:
 		, m_screen(*this, "screen")
 		, m_banke(*this, "banke")
 		, m_bankf(*this, "bankf")
+		, m_ls145(*this, "ls145")
+		, m_cursor_timer(*this, "cursor")
 	{ }
 
 	DECLARE_READ8_MEMBER(mz700_e008_r);
@@ -90,10 +93,11 @@ public:
 	void mz800_bankf(address_map &map);
 	void mz800_io(address_map &map);
 	void mz800_mem(address_map &map);
+
 private:
 	int m_mz700;                /* 1 if running on an mz700 */
 
-	int m_cursor_timer;
+	int m_cursor_bit;
 	int m_other_timer;
 
 	int m_intmsk;   /* PPI8255 pin PC2 */
@@ -134,6 +138,9 @@ private:
 	required_device<screen_device> m_screen;
 	optional_device<address_map_bank_device> m_banke;
 	optional_device<address_map_bank_device> m_bankf;
+
+	required_device<ttl74145_device> m_ls145;
+	required_device<timer_device> m_cursor_timer;
 };
 
 #endif // MAME_INCLUDES_MZ700_H
diff --git a/src/mame/includes/n64.h b/src/mame/includes/n64.h
index a2d8ffa8ceb..1351db0e469 100644
--- a/src/mame/includes/n64.h
+++ b/src/mame/includes/n64.h
@@ -12,6 +12,7 @@
 /*----------- driver state -----------*/
 
 class n64_rdp;
+class n64_periphs;
 
 class n64_state : public driver_device
 {
@@ -24,6 +25,7 @@ public:
 		, m_rdram(*this, "rdram")
 		, m_rsp_imem(*this, "rsp_imem")
 		, m_rsp_dmem(*this, "rsp_dmem")
+		, m_rcp_periphs(*this, "rcp")
 	{
 	}
 
@@ -51,6 +53,8 @@ protected:
 	required_shared_ptr<uint32_t> m_rsp_imem;
 	required_shared_ptr<uint32_t> m_rsp_dmem;
 
+	required_device<n64_periphs> m_rcp_periphs;
+
 	/* video-related */
 	n64_rdp *m_rdp;
 };
diff --git a/src/mame/includes/primo.h b/src/mame/includes/primo.h
index bc524e1406f..35aa9c55923 100644
--- a/src/mame/includes/primo.h
+++ b/src/mame/includes/primo.h
@@ -31,7 +31,9 @@ public:
 		m_cassette(*this, "cassette"),
 		m_cart1(*this, "cartslot1"),
 		m_cart2(*this, "cartslot2"),
-		m_screen(*this, "screen")
+		m_screen(*this, "screen"),
+		m_mem_exp_port(*this, "MEMORY_EXPANSION"),
+		m_clock_port(*this, "CPU_CLOCK")
 	{ }
 
 	void init_primo48();
@@ -80,6 +82,8 @@ private:
 	required_device<generic_slot_device> m_cart1;
 	required_device<generic_slot_device> m_cart2;
 	required_device<screen_device> m_screen;
+	required_ioport m_mem_exp_port;
+	required_ioport m_clock_port;
 
 	memory_region *m_cart1_rom;
 	memory_region *m_cart2_rom;
diff --git a/src/mame/includes/toaplan1.h b/src/mame/includes/toaplan1.h
index 195d5f47c60..b87151ea375 100644
--- a/src/mame/includes/toaplan1.h
+++ b/src/mame/includes/toaplan1.h
@@ -6,6 +6,7 @@
 ****************************************************************************/
 
 #include "cpu/m68000/m68000.h"
+#include "sound/3812intf.h"
 #include "video/toaplan_scu.h"
 #include "screen.h"
 
@@ -20,6 +21,7 @@ public:
 		m_spriteram(*this, "spriteram"),
 		m_maincpu(*this, "maincpu"),
 		m_audiocpu(*this, "audiocpu"),
+		m_ymsnd(*this, "ymsnd"),
 		m_dsp(*this, "dsp"),
 		m_gfxdecode(*this, "gfxdecode"),
 		m_screen(*this, "screen"),
@@ -159,6 +161,7 @@ public:
 	DECLARE_WRITE_LINE_MEMBER(toaplan1_reset_callback);
 	required_device<m68000_device> m_maincpu;
 	required_device<cpu_device> m_audiocpu;
+	required_device<ym3812_device> m_ymsnd;
 	optional_device<cpu_device> m_dsp;
 	required_device<gfxdecode_device> m_gfxdecode;
 	required_device<screen_device> m_screen;
diff --git a/src/mame/machine/mz700.cpp b/src/mame/machine/mz700.cpp
index e7db1cb4cbe..5ca4bdb4f38 100644
--- a/src/mame/machine/mz700.cpp
+++ b/src/mame/machine/mz700.cpp
@@ -471,15 +471,13 @@ WRITE_LINE_MEMBER(mz_state::pit_irq_2)
 
 READ8_MEMBER(mz_state::pio_port_b_r)
 {
-	device_t *device = machine().device("ls145");
-	int key_line = dynamic_cast<ttl74145_device *>(device)->read();
+	const int key_line = m_ls145->read();
 	const char *const keynames[10] = { "ROW0", "ROW1", "ROW2", "ROW3", "ROW4", "ROW5", "ROW6", "ROW7", "ROW8", "ROW9" };
-	int i;
 	uint8_t res = 0;
 
-	for(i=0;i<10;i++)
+	for (int i = 0; i < 10; i++)
 	{
-		if(key_line & (1 << i))
+		if (key_line & (1 << i))
 			res |= ioport(keynames[i])->read();
 	}
 
@@ -503,7 +501,7 @@ READ8_MEMBER(mz_state::pio_port_c_r)
 	if ((m_cassette)->input() > 0.0038)
 		data |= 0x20;       /* set the RDATA status */
 
-	data |= m_cursor_timer << 6;
+	data |= m_cursor_bit << 6;
 	data |= m_screen->vblank() << 7;
 
 	LOG(2,"mz700_pio_port_c_r",("%02X\n", data),machine());
@@ -514,16 +512,13 @@ READ8_MEMBER(mz_state::pio_port_c_r)
 
 WRITE8_MEMBER(mz_state::pio_port_a_w)
 {
-	device_t *device = machine().device("ls145");
-	timer_device *timer = machine().device<timer_device>("cursor");
-
 	LOG(2,"mz700_pio_port_a_w",("%02X\n", data),machine());
 
 	/* the ls145 is connected to PA0-PA3 */
-	dynamic_cast<ttl74145_device *>(device)->write(data & 0x0f);
+	m_ls145->write(data & 0x0f);
 
 	/* ne556 reset is connected to PA7 */
-	timer->enable(BIT(data, 7));
+	m_cursor_timer->enable(BIT(data, 7));
 }
 
 
diff --git a/src/mame/machine/poly88.cpp b/src/mame/machine/poly88.cpp
index 6e1c431c0ad..6b2b022a9d0 100644
--- a/src/mame/machine/poly88.cpp
+++ b/src/mame/machine/poly88.cpp
@@ -327,6 +327,6 @@ SNAPSHOT_LOAD_MEMBER( poly88_state, poly88 )
 		}
 		pos+=recordLen;
 	}
-	machine().device("uart")->reset();
+	m_uart->reset();
 	return image_init_result::PASS;
 }
diff --git a/src/mame/machine/primo.cpp b/src/mame/machine/primo.cpp
index 99a235ec987..40f7cb1c396 100644
--- a/src/mame/machine/primo.cpp
+++ b/src/mame/machine/primo.cpp
@@ -229,12 +229,12 @@ void primo_state::init_primo64()
 
 *******************************************************************************/
 
-void primo_state::primo_common_machine_init ()
+void primo_state::primo_common_machine_init()
 {
-	if (ioport("MEMORY_EXPANSION")->read())
+	if (m_mem_exp_port->read())
 		m_port_FD = 0x00;
 	primo_update_memory();
-	machine().device("maincpu")->set_clock_scale(ioport("CPU_CLOCK")->read() ? 1.5 : 1.0);
+	m_maincpu->set_clock_scale(m_clock_port->read() ? 1.5 : 1.0);
 }
 
 void primo_state::machine_start()
diff --git a/src/mame/machine/rm380z.cpp b/src/mame/machine/rm380z.cpp
index 966eaf61590..2a3aa0690ab 100644
--- a/src/mame/machine/rm380z.cpp
+++ b/src/mame/machine/rm380z.cpp
@@ -287,7 +287,7 @@ void rm380z_state::machine_reset()
 	memset(m_vram,0,RM380Z_SCREENSIZE);
 
 	config_memory_map();
-	machine().device("wd1771")->reset();
+	m_fdc->reset();
 
 	init_graphic_chars();
 }
diff --git a/src/mame/machine/rmnimbus.cpp b/src/mame/machine/rmnimbus.cpp
index 718efce47be..6dd1afdf2b8 100644
--- a/src/mame/machine/rmnimbus.cpp
+++ b/src/mame/machine/rmnimbus.cpp
@@ -895,7 +895,7 @@ static const nimbus_blocks ramblocks[] =
 
 void rmnimbus_state::nimbus_bank_memory()
 {
-	address_space &space = machine().device( MAINCPU_TAG)->memory().space( AS_PROGRAM );
+	address_space &space = m_maincpu->space(AS_PROGRAM);
 	int     ramsize = m_ram->size();
 	int     ramblock = 0;
 	int     blockno;
diff --git a/src/mame/machine/toaplan1.cpp b/src/mame/machine/toaplan1.cpp
index dc0d4abf08a..51ec990975f 100644
--- a/src/mame/machine/toaplan1.cpp
+++ b/src/mame/machine/toaplan1.cpp
@@ -172,7 +172,7 @@ void toaplan1_state::toaplan1_reset_sound()
 	/* Reset the secondary CPU and sound chip */
 	/* rallybik, truxton, hellfire, demonwld write to a port to cause a reset */
 	/* zerowing, fireshrk, outzone, vimana use a RESET instruction instead */
-	machine().device("ymsnd")->reset();
+	m_ymsnd->reset();
 	m_audiocpu->pulse_input_line(INPUT_LINE_RESET, attotime::zero);
 }
 
diff --git a/src/mame/video/n64.cpp b/src/mame/video/n64.cpp
index d12787bb9b0..f951d0ad280 100644
--- a/src/mame/video/n64.cpp
+++ b/src/mame/video/n64.cpp
@@ -95,7 +95,7 @@ void n64_state::video_start()
 
 	m_rdp->set_machine(machine());
 	m_rdp->init_internal_state();
-	m_rdp->set_n64_periphs(machine().device<n64_periphs>("rcp"));
+	m_rdp->set_n64_periphs(m_rcp_periphs);
 
 	m_rdp->m_blender.set_machine(machine());
 	m_rdp->m_blender.set_processor(m_rdp);
diff --git a/src/mame/video/pc_t1t.h b/src/mame/video/pc_t1t.h
index 31917bb31bf..af219d5f567 100644
--- a/src/mame/video/pc_t1t.h
+++ b/src/mame/video/pc_t1t.h
@@ -147,8 +147,4 @@ private:
 
 DECLARE_DEVICE_TYPE(PCVIDEO_PCJR, pcvideo_pcjr_device)
 
-#define MCFG_PCVIDEO_PCJR_ADD(_tag) \
-		MCFG_DEVICE_ADD(_tag, PCVIDEO_PCJR, 0)
-
-
 #endif // MAME_VIDEO_PC_T1T_H