diff --git a/src/mame/drivers/tsispch.cpp b/src/mame/drivers/tsispch.cpp
index 6616ccf45f5..283cc43dbbe 100644
--- a/src/mame/drivers/tsispch.cpp
+++ b/src/mame/drivers/tsispch.cpp
@@ -114,7 +114,6 @@
 #include "includes/tsispch.h"
 
 #include "cpu/i86/i86.h"
-#include "cpu/upd7725/upd7725.h"
 #include "machine/i8251.h"
 #include "sound/dac.h"
 #include "sound/volt_reg.h"
@@ -184,44 +183,38 @@ WRITE8_MEMBER( tsispch_state::peripheral_w )
 *****************************************************************************/
 READ16_MEMBER( tsispch_state::dsp_data_r )
 {
-	upd7725_device *upd7725 = machine().device<upd7725_device>("dsp");
 #ifdef DEBUG_DSP
-	uint8_t temp;
-	temp = upd7725->snesdsp_read(true);
+	uint8_t temp = m_dsp->snesdsp_read(true);
 	fprintf(stderr, "dsp data read: %02x\n", temp);
 	return temp;
 #else
-	return upd7725->snesdsp_read(true);
+	return m_dsp->snesdsp_read(true);
 #endif
 }
 
 WRITE16_MEMBER( tsispch_state::dsp_data_w )
 {
-	upd7725_device *upd7725 = machine().device<upd7725_device>("dsp");
 #ifdef DEBUG_DSP_W
 	fprintf(stderr, "dsp data write: %02x\n", data);
 #endif
-	upd7725->snesdsp_write(true, data);
+	m_dsp->snesdsp_write(true, data);
 }
 
 READ16_MEMBER( tsispch_state::dsp_status_r )
 {
-	upd7725_device *upd7725 = machine().device<upd7725_device>("dsp");
 #ifdef DEBUG_DSP
-	uint8_t temp;
-	temp = upd7725->snesdsp_read(false);
+	uint8_t temp = m_dsp->snesdsp_read(false);
 	fprintf(stderr, "dsp status read: %02x\n", temp);
 	return temp;
 #else
-	return upd7725->snesdsp_read(false);
+	return m_dsp->snesdsp_read(false);
 #endif
 }
 
 WRITE16_MEMBER( tsispch_state::dsp_status_w )
 {
 	fprintf(stderr, "warning: upd772x status register should never be written to!\n");
-	upd7725_device *upd7725 = machine().device<upd7725_device>("dsp");
-	upd7725->snesdsp_write(false, data);
+	m_dsp->snesdsp_write(false, data);
 }
 
 WRITE_LINE_MEMBER( tsispch_state::dsp_to_8086_p0_w )
diff --git a/src/mame/drivers/tvc.cpp b/src/mame/drivers/tvc.cpp
index c15c06ebbbc..9c271b561ce 100644
--- a/src/mame/drivers/tvc.cpp
+++ b/src/mame/drivers/tvc.cpp
@@ -50,6 +50,7 @@ public:
 		, m_cassette(*this, "cassette")
 		, m_cart(*this, "cartslot")
 		, m_centronics(*this, CENTRONICS_TAG)
+		, m_expansions(*this, "exp%u", 1)
 		, m_palette(*this, "palette")
 		, m_keyboard(*this, "LINE.%u", 0)
 	{ }
@@ -60,10 +61,10 @@ public:
 	required_device<cassette_image_device> m_cassette;
 	required_device<generic_slot_device> m_cart;
 	required_device<centronics_device> m_centronics;
+	required_device_array<tvcexp_slot_device, 4> m_expansions;
 	required_device<palette_device> m_palette;
 	required_ioport_array<16> m_keyboard;
 
-	tvcexp_slot_device *m_expansions[4];
 	memory_region *m_bios_rom;
 	memory_region *m_cart_rom;
 	memory_region *m_ext;
@@ -609,11 +610,6 @@ void tvc_state::machine_start()
 
 	m_int_flipflop = 0;
 
-	m_expansions[0] = machine().device<tvcexp_slot_device>("exp1");
-	m_expansions[1] = machine().device<tvcexp_slot_device>("exp2");
-	m_expansions[2] = machine().device<tvcexp_slot_device>("exp3");
-	m_expansions[3] = machine().device<tvcexp_slot_device>("exp4");
-
 	m_bios_rom = memregion("sys");
 	m_ext = memregion("ext");
 	m_vram = memregion("vram");
diff --git a/src/mame/includes/tsispch.h b/src/mame/includes/tsispch.h
index e6ce7790132..3789b64de03 100644
--- a/src/mame/includes/tsispch.h
+++ b/src/mame/includes/tsispch.h
@@ -11,6 +11,7 @@
 
 #pragma once
 
+#include "cpu/upd7725/upd7725.h"
 #include "machine/pic8259.h"
 #include "machine/terminal.h"
 
@@ -50,7 +51,7 @@ protected:
 	virtual void machine_reset() override;
 
 	required_device<cpu_device> m_maincpu;
-	required_device<cpu_device> m_dsp;
+	required_device<upd7725_device> m_dsp;
 	required_device<generic_terminal_device> m_terminal;
 	required_device<pic8259_device> m_pic;