diff --git a/scripts/src/machine.lua b/scripts/src/machine.lua
index e72a653f5b9..4e7352c3e41 100644
--- a/scripts/src/machine.lua
+++ b/scripts/src/machine.lua
@@ -4269,6 +4269,18 @@ if (MACHINES["I3002"]~=null) then
 	}
 end
 
+---------------------------------------------------
+--
+--@src/devices/machine/s_smp.h,MACHINES["S_SMP"] = true
+---------------------------------------------------
+
+if (MACHINES["S_SMP"]~=null) then
+	files {
+		MAME_DIR .. "src/devices/machine/s_smp.cpp",
+		MAME_DIR .. "src/devices/machine/s_smp.h",
+	}
+end
+
 ---------------------------------------------------
 --
 --@src/devices/machine/cxd1185.h,MACHINES["CXD1185"] = true
diff --git a/scripts/src/sound.lua b/scripts/src/sound.lua
index dc0a1a93f07..3b98b9095ce 100644
--- a/scripts/src/sound.lua
+++ b/scripts/src/sound.lua
@@ -1566,6 +1566,18 @@ if (SOUNDS["VGMVIZ"]~=null) then
 	}
 end
 
+---------------------------------------------------
+--
+--@src/devices/sound/s_dsp.h,SOUNDS["S_DSP"] = true
+---------------------------------------------------
+
+if (SOUNDS["S_DSP"]~=null) then
+	files {
+		MAME_DIR .. "src/devices/sound/s_dsp.cpp",
+		MAME_DIR .. "src/devices/sound/s_dsp.h",
+	}
+end
+
 ---------------------------------------------------
 --
 --@src/devices/sound/ks0164.h,SOUNDS["KS0164"] = true
diff --git a/scripts/target/mame/arcade.lua b/scripts/target/mame/arcade.lua
index a23f7e6d066..81bf00505b6 100644
--- a/scripts/target/mame/arcade.lua
+++ b/scripts/target/mame/arcade.lua
@@ -279,6 +279,7 @@ SOUNDS["MM5837"] = true
 --SOUNDS["DAVE"] = true
 SOUNDS["LC7535"] = true
 --SOUNDS["UPD934G"] = true
+SOUNDS["S_DSP"] = true
 SOUNDS["KS0164"] = true
 
 --------------------------------------------------
@@ -595,6 +596,7 @@ MACHINES["RSTBUF"] = true
 MACHINES["RTC4543"] = true
 MACHINES["RTC65271"] = true
 MACHINES["RTC9701"] = true
+MACHINES["S_SMP"] = true
 MACHINES["S2636"] = true
 MACHINES["S3520CF"] = true
 MACHINES["S3C24XX"] = true
@@ -3099,8 +3101,6 @@ files {
 	MAME_DIR .. "src/mame/video/n8080.cpp",
 	MAME_DIR .. "src/mame/drivers/nss.cpp",
 	MAME_DIR .. "src/mame/machine/snes.cpp",
-	MAME_DIR .. "src/mame/audio/snes_snd.cpp",
-	MAME_DIR .. "src/mame/audio/snes_snd.h",
 	MAME_DIR .. "src/mame/drivers/playch10.cpp",
 	MAME_DIR .. "src/mame/includes/playch10.h",
 	MAME_DIR .. "src/mame/machine/playch10.cpp",
diff --git a/scripts/target/mame/mess.lua b/scripts/target/mame/mess.lua
index a8912c103db..545bf4646e0 100644
--- a/scripts/target/mame/mess.lua
+++ b/scripts/target/mame/mess.lua
@@ -302,6 +302,7 @@ SOUNDS["IOPSPU"] = true
 SOUNDS["SWP00"] = true
 SOUNDS["SWP20"] = true
 SOUNDS["SWP30"] = true
+SOUNDS["S_DSP"] = true
 SOUNDS["ROLANDPCM"] = true
 
 --------------------------------------------------
@@ -617,6 +618,7 @@ MACHINES["RSTBUF"] = true
 MACHINES["RTC4543"] = true
 MACHINES["RTC65271"] = true
 MACHINES["RTC9701"] = true
+MACHINES["S_SMP"] = true
 --MACHINES["S2636"] = true
 MACHINES["S3520CF"] = true
 MACHINES["S3C24XX"] = true
@@ -1419,8 +1421,6 @@ files {
 	MAME_DIR .. "src/mame/machine/kabuki.h",
 	MAME_DIR .. "src/mame/video/pk8000.cpp",
 	MAME_DIR .. "src/mame/machine/snes.cpp",
-	MAME_DIR .. "src/mame/audio/snes_snd.cpp",
-	MAME_DIR .. "src/mame/audio/snes_snd.h",
 	MAME_DIR .. "src/mame/machine/n64.cpp",
 	MAME_DIR .. "src/mame/video/n64.cpp",
 	MAME_DIR .. "src/mame/video/n64types.h",
diff --git a/src/devices/cpu/spc700/spc700.cpp b/src/devices/cpu/spc700/spc700.cpp
index 57d2b5c5df8..7f5a35d6757 100644
--- a/src/devices/cpu/spc700/spc700.cpp
+++ b/src/devices/cpu/spc700/spc700.cpp
@@ -222,8 +222,13 @@ DEFINE_DEVICE_TYPE(SPC700, spc700_device, "spc700", "Sony SPC700")
 
 
 spc700_device::spc700_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
-	: cpu_device(mconfig, SPC700, tag, owner, clock)
-	, m_program_config("program", ENDIANNESS_LITTLE, 8, 16, 0)
+	: spc700_device(mconfig, SPC700, tag, owner, clock)
+{
+}
+
+spc700_device::spc700_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, address_map_constructor internal_map)
+	: cpu_device(mconfig, type, tag, owner, clock)
+	, m_program_config("program", ENDIANNESS_LITTLE, 8, 16, 0, internal_map)
 	, m_a(0)
 	, m_x(0)
 	, m_y(0)
diff --git a/src/devices/cpu/spc700/spc700.h b/src/devices/cpu/spc700/spc700.h
index bd1b90c475e..33e3190ac10 100644
--- a/src/devices/cpu/spc700/spc700.h
+++ b/src/devices/cpu/spc700/spc700.h
@@ -13,6 +13,9 @@ public:
 	spc700_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
 
 protected:
+	// construction/destruction
+	spc700_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, address_map_constructor internal_map = address_map_constructor());
+
 	// device-level overrides
 	virtual void device_start() override;
 	virtual void device_reset() override;
@@ -36,9 +39,8 @@ protected:
 	// device_disasm_interface overrides
 	virtual std::unique_ptr<util::disasm_interface> create_disassembler() override;
 
-private:
 	address_space_config m_program_config;
-
+private:
 	uint32_t m_a;     /* Accumulator */
 	uint32_t m_x;     /* Index Register X */
 	uint32_t m_y;     /* Index Register Y */
diff --git a/src/devices/machine/s_smp.cpp b/src/devices/machine/s_smp.cpp
new file mode 100644
index 00000000000..d71b0449f65
--- /dev/null
+++ b/src/devices/machine/s_smp.cpp
@@ -0,0 +1,321 @@
+// license:LGPL-2.1+
+// copyright-holders:R. Belmont, Brad Martin
+/***************************************************************************
+
+  s_smp.cpp
+
+  File to handle the S-SMP emulation used in Nintendo Super NES.
+
+  By R. Belmont, adapted from OpenSPC 0.3.99 by Brad Martin with permission.
+  Thanks to Brad and also to Charles Bilyu? of SNeESe.
+
+  OpenSPC's license terms (the LGPL) follow:
+
+ ---------------------------------------------------------------------------
+
+  Copyright Brad Martin.
+
+  OpenSPC is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2 of the License, or
+  (at your option) any later version.
+
+  OpenSPC is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU Lesser General Public License for more details.
+
+***************************************************************************/
+
+#include "emu.h"
+#include "s_smp.h"
+
+/***************************************************************************
+ CONSTANTS AND MACROS
+***************************************************************************/
+
+
+// Nintendo/Sony S-SMP internal ROM region
+ROM_START( s_smp )
+	ROM_REGION( 0x40, "sound_ipl", 0 )     /* IPL ROM */
+	ROM_LOAD( "spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) ) /* boot rom */
+ROM_END
+
+
+void s_smp_device::internal_map(address_map &map)
+{
+	map(0x0000, 0x00ef).lrw8(
+		[this](offs_t offset) -> u8 { return data_read_byte(offset); }, "data_r",
+		[this](offs_t offset, u8 data) { data_write_byte(offset, data); }, "data_w");
+	map(0x00f0, 0x00ff).rw(FUNC(s_smp_device::io_r), FUNC(s_smp_device::io_w));
+	map(0x0100, 0xffff).lrw8(
+		[this](offs_t offset) -> u8 { return data_read_byte(offset + 0x100); }, "data_100_r",
+		[this](offs_t offset, u8 data) { data_write_byte(offset + 0x100, data); }, "data_100_w");
+}
+
+
+DEFINE_DEVICE_TYPE(S_SMP, s_smp_device, "s_smp", "Nintendo/Sony S-SMP")
+
+
+s_smp_device::s_smp_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+	: spc700_device(mconfig, S_SMP, tag, owner, clock, address_map_constructor(FUNC(s_smp_device::internal_map), this))
+	, m_data_config("data", ENDIANNESS_LITTLE, 8, 16)
+	, m_ipl_region(*this, "sound_ipl")
+	, m_dsp_io_r_cb(*this)
+	, m_dsp_io_w_cb(*this)
+{
+}
+
+
+//-------------------------------------------------
+//  rom_region - return a pointer to the device's
+//  internal ROM region
+//-------------------------------------------------
+
+const tiny_rom_entry *s_smp_device::device_rom_region() const
+{
+	return ROM_NAME( s_smp );
+}
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void s_smp_device::device_start()
+{
+	m_dsp_io_r_cb.resolve_safe(0);
+	m_dsp_io_w_cb.resolve_safe();
+
+	m_data = &space(AS_DATA);
+	// Find our direct access
+	m_dcache = m_data->cache<0, 0, ENDIANNESS_LITTLE>();
+
+	m_tick_timer = timer_alloc(TIMER_TICK_ID);
+
+	save_item(NAME(m_timer_enabled));
+	save_item(NAME(m_subcounter));
+	save_item(NAME(m_counter));
+	save_item(NAME(m_port_in));
+	save_item(NAME(m_port_out));
+	save_item(NAME(m_test));
+	save_item(NAME(m_ctrl));
+	save_item(NAME(m_counter_reg));
+
+	save_item(NAME(m_TnDIV));
+	spc700_device::device_start();
+}
+
+//-------------------------------------------------
+//  device_reset - device-specific reset
+//-------------------------------------------------
+
+void s_smp_device::device_reset()
+{
+	int i;
+	/* default to ROM visible */
+	m_ctrl = 0x80;
+
+	/* Sort out the ports */
+	for (i = 0; i < 4; i++)
+	{
+		m_port_in[i] = 0;
+		m_port_out[i] = 0;
+	}
+
+	for (i = 0; i < 3; i++)
+	{
+		m_timer_enabled[i] = false;
+		m_TnDIV[i] = 256;
+		m_counter[i] = 0;
+		m_subcounter[i] = 0;
+	}
+
+	attotime period = attotime::from_ticks(32, clock());
+	m_tick_timer->adjust(period, 0, period);
+	spc700_device::device_reset();
+}
+
+//-------------------------------------------------
+//  device_clock_changed - called if the clock
+//  changes
+//-------------------------------------------------
+
+void s_smp_device::device_clock_changed()
+{
+	attotime period = attotime::from_ticks(32, clock());
+	m_tick_timer->adjust(period, 0, period);
+}
+
+//-------------------------------------------------
+//  memory_space_config - return a description of
+//  any address spaces owned by this device
+//-------------------------------------------------
+
+device_memory_interface::space_config_vector s_smp_device::memory_space_config() const
+{
+	return space_config_vector{
+		std::make_pair(AS_PROGRAM, &m_program_config),
+		std::make_pair(AS_DATA, &m_data_config)
+	};
+}
+
+inline void s_smp_device::update_timer_tick(u8 which)
+{
+	if (m_timer_enabled[which] == false)
+		return;
+
+	m_subcounter[which]++;
+
+	// if timer channel is 0 or 1 we update at 64000/8
+	if (m_subcounter[which] >= 8 || which == 2)
+	{
+		m_subcounter[which] = 0;
+		m_counter[which]++;
+		if (m_counter[which] >= m_TnDIV[which] ) // minus =
+		{
+			m_counter[which] = 0;
+			m_counter_reg[which]++;
+			m_counter_reg[which] &= 0x0f;
+		}
+	}
+}
+
+void s_smp_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+	if (id != TIMER_TICK_ID)
+		throw emu_fatalerror("Unknown id in s_smp_device::device_timer");
+
+	for (int ch = 0; ch < 3; ch++)
+		update_timer_tick(ch);
+}
+
+
+/*****************************************************************************
+    IMPLEMENTATION
+*****************************************************************************/
+
+
+/***************************
+        I/O for S-SMP
+ ***************************/
+
+u8 s_smp_device::io_r(offs_t offset)
+{
+	switch (offset) /* Offset is from 0x00f0 */
+	{
+		case 0x0: //FIXME: Super Bomberman PBW reads from there, is it really write-only?
+			return 0;
+		case 0x1:
+			return 0; //Super Kick Boxing reads port 1 and wants it to be zero.
+		case 0x2:       /* Register address */
+		case 0x3:       /* Register data */
+			return m_dsp_io_r_cb(offset - 0x2);
+		case 0x4:       /* Port 0 */
+		case 0x5:       /* Port 1 */
+		case 0x6:       /* Port 2 */
+		case 0x7:       /* Port 3 */
+			// osd_printf_debug("%s SPC: rd %02x @ %d\n", machine().describe_context(), m_port_in[offset - 4], offset - 4);
+			return m_port_in[offset - 4];
+		case 0x8: //normal RAM, can be read even if the ram disabled flag ($f0 bit 1) is active
+		case 0x9:
+			return data_read_byte(0xf0 + offset);
+		case 0xa:       /* Timer 0 */
+		case 0xb:       /* Timer 1 */
+		case 0xc:       /* Timer 2 */
+			break;
+		case 0xd:       /* Counter 0 */
+		case 0xe:       /* Counter 1 */
+		case 0xf:       /* Counter 2 */
+		{
+			u8 value = m_counter_reg[offset - 0xd] & 0x0f;
+			if (!machine().side_effects_disabled())
+				m_counter_reg[offset - 0xd] = 0;
+			return value;
+		}
+	}
+
+	return 0;
+}
+
+void s_smp_device::io_w(offs_t offset, u8 data)
+{
+	switch (offset) /* Offset is from 0x00f0 */
+	{
+		case 0x0:
+			m_test = data;
+			logerror("Warning: write to SOUND TEST register with data %02x!\n", data);
+			break;
+		case 0x1:       /* Control */
+			m_ctrl = data;
+			for (int i = 0; i < 3; i++)
+			{
+				if (BIT(data, i) && m_timer_enabled[i] == false)
+				{
+					m_subcounter[i] = 0;
+					m_counter[i] = 0;
+					m_counter_reg[i] = 0;
+				}
+
+				m_timer_enabled[i] = BIT(data, i);
+				//m_timer[i]->enable(m_timer_enabled[i]);
+			}
+
+			if (BIT(data, 4))
+			{
+				m_port_in[0] = 0;
+				m_port_in[1] = 0;
+			}
+
+			if (BIT(data, 5))
+			{
+				m_port_in[2] = 0;
+				m_port_in[3] = 0;
+			}
+
+			/* bit 7 = IPL ROM enable */
+			break;
+		case 0x2:       /* Register address */
+		case 0x3:       /* Register data - 0x80-0xff is a read-only mirror of 0x00-0x7f */
+			m_dsp_io_w_cb(offset - 0x2, data);
+			break;
+		case 0x4:       /* Port 0 */
+		case 0x5:       /* Port 1 */
+		case 0x6:       /* Port 2 */
+		case 0x7:       /* Port 3 */
+			// osd_printf_debug("%s SPC: %02x to APU @ %d\n", machine().describe_context(), data, offset & 3);
+			m_port_out[offset - 4] = data;
+			// Unneeded, we already run at perfect_interleave
+			// machine().scheduler().boost_interleave(attotime::zero, attotime::from_usec(20));
+			break;
+		case 0xa:       /* Timer 0 */
+		case 0xb:       /* Timer 1 */
+		case 0xc:       /* Timer 2 */
+			// if 0 then TnDiv is divided by 256, otherwise it's divided by 1 to 255
+			if (data == 0)
+				m_TnDIV[offset - 0xa] = 256;
+			else
+				m_TnDIV[offset - 0xa] = data;
+			break;
+		case 0xd:       /* Counter 0 */
+		case 0xe:       /* Counter 1 */
+		case 0xf:       /* Counter 2 */
+			return;
+	}
+
+	data_write_byte(0xf0 + offset, data);
+}
+
+
+u8 s_smp_device::spc_port_out_r(offs_t offset)
+{
+	assert(offset < 4);
+
+	return m_port_out[offset];
+}
+
+void s_smp_device::spc_port_in_w(offs_t offset, u8 data)
+{
+	assert(offset < 4);
+
+	m_port_in[offset] = data;
+}
diff --git a/src/devices/machine/s_smp.h b/src/devices/machine/s_smp.h
new file mode 100644
index 00000000000..5fe04b1880a
--- /dev/null
+++ b/src/devices/machine/s_smp.h
@@ -0,0 +1,90 @@
+// license:LGPL-2.1+
+// copyright-holders:R. Belmont, Brad Martin
+/*****************************************************************************
+ *
+ * Nintendo/Sony S-SMP emulation
+ *
+ ****************************************************************************/
+
+#ifndef MAME_MACHINE_S_SMP_H
+#define MAME_MACHINE_S_SMP_H
+
+#include "cpu/spc700/spc700.h"
+
+/***************************************************************************
+ TYPE DEFINITIONS
+ ***************************************************************************/
+
+class s_smp_device : public spc700_device
+{
+public:
+	s_smp_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+	auto dsp_io_read_callback() { return m_dsp_io_r_cb.bind(); }
+	auto dsp_io_write_callback() { return m_dsp_io_w_cb.bind(); }
+
+	u8 spc_port_out_r(offs_t offset);
+	void spc_port_in_w(offs_t offset, u8 data);
+
+protected:
+	tiny_rom_entry const *device_rom_region() const override;
+	virtual void device_start() override;
+	virtual void device_reset() override;
+	virtual void device_clock_changed() override;
+	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
+
+	// device_memory_interface configuration
+	virtual space_config_vector memory_space_config() const override;
+
+	address_space_config m_data_config;
+
+private:
+	address_space                                *m_data;
+	memory_access_cache<0, 0, ENDIANNESS_LITTLE> *m_dcache;
+	inline u8 data_read_byte(offs_t a)
+	{
+		/* IPL ROM enabled */
+		if (a >= 0xffc0 && m_ctrl & 0x80)
+			return m_ipl_region[a & 0x3f];
+
+		return m_dcache->read_byte(a);
+	}
+	inline void data_write_byte(offs_t a, u8 d) { m_data->write_byte(a, d); }
+
+	required_region_ptr<u8> m_ipl_region;     /* SPC top 64 bytes */
+
+	u8 io_r(offs_t offset);
+	void io_w(offs_t offset, u8 data);
+
+	enum
+	{
+		TIMER_TICK_ID = 1
+	};
+	/* timers */
+	emu_timer             *m_tick_timer;
+	bool                  m_timer_enabled[3];
+	u16                   m_counter[3];
+	u8                    m_subcounter[3];
+	inline void update_timer_tick(u8 which);
+
+	/* IO ports */
+	u8                    m_port_in[4];         /* SPC input ports */
+	u8                    m_port_out[4];        /* SPC output ports */
+
+	u16                   m_TnDIV[3]; /**< Timer N Divider */
+
+	// registers
+	u8                    m_test;
+	u8                    m_ctrl;
+	u8                    m_counter_reg[3];
+
+	devcb_read8           m_dsp_io_r_cb;
+	devcb_write8          m_dsp_io_w_cb;
+
+	void internal_map(address_map &map);
+};
+
+DECLARE_DEVICE_TYPE(S_SMP, s_smp_device)
+
+
+#endif // MAME_MACHINE_S_SMP_H
diff --git a/src/mame/audio/snes_snd.cpp b/src/devices/sound/s_dsp.cpp
similarity index 78%
rename from src/mame/audio/snes_snd.cpp
rename to src/devices/sound/s_dsp.cpp
index 8983b6df3a2..976fb33f5a2 100644
--- a/src/mame/audio/snes_snd.cpp
+++ b/src/devices/sound/s_dsp.cpp
@@ -2,9 +2,9 @@
 // copyright-holders:R. Belmont, Brad Martin
 /***************************************************************************
 
-  snes_snd.cpp
+  s_dsp.cpp
 
-  File to handle the sound emulation of the Nintendo Super NES.
+  File to handle the S-DSP emulation used in Nintendo Super NES.
 
   By R. Belmont, adapted from OpenSPC 0.3.99 by Brad Martin with permission.
   Thanks to Brad and also to Charles Bilyu? of SNeESe.
@@ -28,7 +28,7 @@
 ***************************************************************************/
 
 #include "emu.h"
-#include "audio/snes_snd.h"
+#include "s_dsp.h"
 
 /***************************************************************************
  CONSTANTS AND MACROS
@@ -135,72 +135,42 @@ static const int ENVCNT[0x20]
 	};
 
 
-/* Make reading the ADSR code easier */
-#define SL( v )         (m_dsp_regs[((v) << 4) + 6] >> 5)         /* Returns SUSTAIN level        */
-#define SR( v )         (m_dsp_regs[((v) << 4) + 6] & 0x1f)       /* Returns SUSTAIN rate         */
-
-/* Handle endianness */
-#define LEtoME16( x ) little_endianize_int16(x)
-#define MEtoLE16( x ) little_endianize_int16(x)
-
-ALLOW_SAVE_TYPE(snes_sound_device::env_state_t32);
+ALLOW_SAVE_TYPE(s_dsp_device::env_state_t32);
 
 
-DEFINE_DEVICE_TYPE(SNES_SOUND, snes_sound_device, "snes_sound", "SNES Custom DSP (SPC700)")
+DEFINE_DEVICE_TYPE(S_DSP, s_dsp_device, "s_dsp", "Nintendo/Sony S-DSP")
 
-snes_sound_device::snes_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
-	: device_t(mconfig, SNES_SOUND, tag, owner, clock)
+
+s_dsp_device::s_dsp_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+	: device_t(mconfig, S_DSP, tag, owner, clock)
 	, device_sound_interface(mconfig, *this)
+	, device_memory_interface(mconfig, *this)
+	, m_data_config("data", ENDIANNESS_LITTLE, 8, 16)
 {
 }
 
+
 //-------------------------------------------------
 //  device_start - device-specific startup
 //-------------------------------------------------
 
-void snes_sound_device::device_start()
+void s_dsp_device::device_start()
 {
+	m_data = &space(0);
+	// Find our direct access
+	m_cache = m_data->cache<0, 0, ENDIANNESS_LITTLE>();
+
 	m_channel = machine().sound().stream_alloc(*this, 0, 2, clock() / 64);
 
-	m_ram = make_unique_clear<u8[]>(SNES_SPCRAM_SIZE);
-
-	/* put IPL image at the top of RAM */
-	memcpy(m_ipl_region, machine().root_device().memregion("sound_ipl")->base(), 64);
-
-	m_tick_timer = timer_alloc(TIMER_TICK_ID);
-
 	state_register();
-	save_pointer(NAME(m_ram), SNES_SPCRAM_SIZE);
 }
 
 //-------------------------------------------------
 //  device_reset - device-specific reset
 //-------------------------------------------------
 
-void snes_sound_device::device_reset()
+void s_dsp_device::device_reset()
 {
-	int i;
-	/* default to ROM visible */
-	m_ram[0xf1] = 0x80;
-
-	/* Sort out the ports */
-	for (i = 0; i < 4; i++)
-	{
-		m_port_in[i] = 0;
-		m_port_out[i] = 0;
-	}
-
-	for (i = 0; i < 3; i++)
-	{
-		m_timer_enabled[i] = false;
-		m_TnDIV[i] = 256;
-		m_counter[i] = 0;
-		m_subcounter[i] = 0;
-	}
-
-	attotime period = attotime::from_ticks(32, clock());
-	m_tick_timer->adjust(period, 0, period);
-
 	dsp_reset();
 }
 
@@ -209,41 +179,19 @@ void snes_sound_device::device_reset()
 //  changes
 //-------------------------------------------------
 
-void snes_sound_device::device_clock_changed()
+void s_dsp_device::device_clock_changed()
 {
 	m_channel->set_sample_rate(clock() / 64);
-	attotime period = attotime::from_ticks(32, clock());
-	m_tick_timer->adjust(period, 0, period);
 }
 
-inline void snes_sound_device::update_timer_tick(u8 which)
+//-------------------------------------------------
+//  memory_space_config - return a description of
+//  any address spaces owned by this device
+//-------------------------------------------------
+
+device_memory_interface::space_config_vector s_dsp_device::memory_space_config() const
 {
-	if (m_timer_enabled[which] == false)
-		return;
-
-	m_subcounter[which]++;
-
-	// if timer channel is 0 or 1 we update at 64000/8
-	if (m_subcounter[which] >= 8 || which == 2)
-	{
-		m_subcounter[which] = 0;
-		m_counter[which]++;
-		if (m_counter[which] >= m_TnDIV[which] ) // minus =
-		{
-			m_counter[which] = 0;
-			m_ram[0xfd + which]++;
-			m_ram[0xfd + which] &= 0x0f;
-		}
-	}
-}
-
-void snes_sound_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
-{
-	if (id != TIMER_TICK_ID)
-		throw emu_fatalerror("Unknown id in snes_sound_device::device_timer");
-
-	for (int ch = 0; ch < 3; ch++)
-		update_timer_tick(ch);
+	return space_config_vector{ std::make_pair(0, &m_data_config) };
 }
 
 
@@ -258,7 +206,7 @@ void snes_sound_device::device_timer(emu_timer &timer, device_timer_id id, int p
  Reset emulated DSP
 -------------------------------------------------*/
 
-void snes_sound_device::dsp_reset()
+void s_dsp_device::dsp_reset()
 {
 #ifdef MAME_DEBUG
 	logerror("dsp_reset\n");
@@ -295,19 +243,18 @@ void snes_sound_device::dsp_reset()
  to mix audio into
 -------------------------------------------------*/
 
-void snes_sound_device::dsp_update( s16 *sound_ptr )
+void s_dsp_device::dsp_update( s16 *sound_ptr )
 {
 	int V;
 
 	int envx;
 	int m;
-	src_dir_type * sd;
 	int v;
 	int vl;
 	voice_state_type * vp;
 	int vr;
 
-	sd = (src_dir_type *) &m_ram[(int) m_dsp_regs[0x5d] << 8];
+	const u16 sd = m_dsp_regs[0x5d];
 
 	/* Check for reset */
 	if (m_dsp_regs[0x6c] & 0x80)
@@ -355,9 +302,11 @@ void snes_sound_device::dsp_update( s16 *sound_ptr )
 			/* Voice was keyed on */
 			m_keys       |= m;
 			m_keyed_on   |= m;
+#ifdef DBG_KEY
 			vl          = m_dsp_regs[(v << 4) + 4];
-			vp->samp_id = *( u32 * )&sd[vl];
-			vp->mem_ptr = LEtoME16(sd[vl].vptr);
+#endif
+			vp->samp_id = (vptr(sd, V) << 16) | lptr(sd, V);
+			vp->mem_ptr = vptr(sd, V);
 
 #ifdef DBG_KEY
 			logerror("Keying on voice %d, samp=0x%04X (0x%02X)\n", v, vp->mem_ptr, vl);
@@ -409,7 +358,7 @@ void snes_sound_device::dsp_update( s16 *sound_ptr )
 			continue;
 		}
 
-		vp->pitch = LEtoME16(*((u16 *)&m_dsp_regs[V + 2])) & 0x3fff;
+		vp->pitch = pitch(V);
 
 #ifndef NO_PMOD
 		/* Pitch mod uses OUTX from last voice for this one.  Luckily we haven't
@@ -445,7 +394,7 @@ void snes_sound_device::dsp_update( s16 *sound_ptr )
 						m_dsp_regs[0x7c] |= m;
 						if (vp->end & 2)
 						{
-							vp->mem_ptr = LEtoME16(sd[m_dsp_regs[V + 4]].lptr);
+							vp->mem_ptr = lptr(sd, V);
 
 #ifdef DBG_BRR
 							logerror("BRR looping to 0x%04X\n", vp->mem_ptr);
@@ -472,7 +421,7 @@ void snes_sound_device::dsp_update( s16 *sound_ptr )
 					}
 
 					vp->header_cnt = 8;
-					vl = (u8)m_ram[vp->mem_ptr++];
+					vl = (u8)read_byte(vp->mem_ptr++);
 					vp->range  = vl >> 4;
 					vp->end    = vl & 3;
 					vp->filter = (vl & 12) >> 2;
@@ -485,13 +434,13 @@ void snes_sound_device::dsp_update( s16 *sound_ptr )
 				if (vp->half == 0)
 				{
 					vp->half = 1;
-					outx     = ((s8)m_ram[vp->mem_ptr]) >> 4;
+					outx     = ((s8)read_byte(vp->mem_ptr)) >> 4;
 				}
 				else
 				{
 					vp->half = 0;
 					/* Funkiness to get 4-bit signed to carry through */
-					outx   = (s8)(m_ram[vp->mem_ptr++] << 4);
+					outx   = (s8)(read_byte(vp->mem_ptr++) << 4);
 					outx >>= 4;
 					vp->header_cnt--;
 				}
@@ -644,8 +593,8 @@ void snes_sound_device::dsp_update( s16 *sound_ptr )
 #endif
 
 	int echo_base = ((m_dsp_regs[0x6d] << 8) + m_echo_ptr) & 0xffff;
-	m_fir_lbuf[m_fir_ptr] = (s16)LEtoME16(*(u16 *)&m_ram[echo_base]);
-	m_fir_rbuf[m_fir_ptr] = (s16)LEtoME16(*(u16 *)&m_ram[echo_base + sizeof(s16)]);
+	m_fir_lbuf[m_fir_ptr] = (s16)read_word(echo_base);
+	m_fir_rbuf[m_fir_ptr] = (s16)read_word(echo_base + sizeof(s16));
 
 	/* Now, evaluate the FIR filter, and add the results into the final output. */
 	vl = m_fir_lbuf[m_fir_ptr] * (s8)m_dsp_regs[0x7f];
@@ -709,8 +658,8 @@ void snes_sound_device::dsp_update( s16 *sound_ptr )
 		logerror("Echo: Writing %04X,%04X at location %04X\n", (u16)echol, (u16)echor, echo_base);
 #endif
 
-		*(u16 *)&m_ram[echo_base]               = MEtoLE16((u16)echol);
-		*(u16 *)&m_ram[echo_base + sizeof(s16)] = MEtoLE16((u16)echor);
+		write_word(echo_base, (u16)echol);
+		write_word(echo_base + sizeof(s16), (u16)echor);
 	}
 
 	m_echo_ptr += 2 * sizeof(s16);
@@ -766,7 +715,7 @@ void snes_sound_device::dsp_update( s16 *sound_ptr )
  to process envelope for.
 -------------------------------------------------*/
 
-int snes_sound_device::advance_envelope( int v )
+int s_dsp_device::advance_envelope( int v )
 {
 	int t;
 
@@ -1010,11 +959,11 @@ int snes_sound_device::advance_envelope( int v )
 }
 
 /*-------------------------------------------------
-    spc700_set_volume - sets SPC700 volume level
+    set_volume - sets S-DSP volume level
     for both speakers, used for fade in/out effects
 -------------------------------------------------*/
 
-void snes_sound_device::set_volume(int volume)
+void s_dsp_device::set_volume(int volume)
 {
 	m_channel->set_output_gain(0, volume / 100.0);
 	m_channel->set_output_gain(1, volume / 100.0);
@@ -1025,183 +974,56 @@ void snes_sound_device::set_volume(int volume)
          I/O for DSP
  ***************************/
 
-u8 snes_sound_device::dsp_io_r(offs_t offset)
+u8 s_dsp_device::dsp_io_r(offs_t offset)
 {
 	m_channel->update();
 
 #ifdef NO_ENVX
-	if (8 == (m_ram[0xf2] & 0x0f))
-		m_dsp_regs[m_ram[0xf2]] = 0;
+	if (!machine().side_effects_disabled())
+		if (8 == (m_dsp_addr & 0x0f))
+			m_dsp_regs[m_dsp_addr] = 0;
 #endif
 
 	/* All reads simply return the contents of the addressed register. */
-	return m_dsp_regs[offset & 0x7f];
+	if (offset & 1)
+		return m_dsp_regs[m_dsp_addr & 0x7f];
+
+	return m_dsp_addr;
 }
 
-void snes_sound_device::dsp_io_w(offs_t offset, u8 data)
+void s_dsp_device::dsp_io_w(offs_t offset, u8 data)
 {
 	m_channel->update();
 
-	if (offset == 0x7c)
+	if (offset & 1)
 	{
-		/* Writes to register 0x7c (ENDX) clear ALL bits no matter which value is written */
-		m_dsp_regs[offset] = 0;
-	}
-	else
-	{
-		/* All other writes store the value in the addressed register as expected. */
-		m_dsp_regs[offset] = data;
-	}
-}
-
-/***************************
-       I/O for SPC700
- ***************************/
-
-u8 snes_sound_device::spc_io_r(offs_t offset)
-{
-	switch (offset) /* Offset is from 0x00f0 */
-	{
-		case 0x0: //FIXME: Super Bomberman PBW reads from there, is it really write-only?
-			return 0;
-		case 0x1:
-			return 0; //Super Kick Boxing reads port 1 and wants it to be zero.
-		case 0x2:       /* Register address */
-			return m_ram[0xf2];
-		case 0x3:       /* Register data */
-			return dsp_io_r(m_ram[0xf2]);
-		case 0x4:       /* Port 0 */
-		case 0x5:       /* Port 1 */
-		case 0x6:       /* Port 2 */
-		case 0x7:       /* Port 3 */
-			// osd_printf_debug("%s SPC: rd %02x @ %d\n", machine().describe_context(), m_port_in[offset - 4], offset - 4);
-			return m_port_in[offset - 4];
-		case 0x8: //normal RAM, can be read even if the ram disabled flag ($f0 bit 1) is active
-		case 0x9:
-			return m_ram[0xf0 + offset];
-		case 0xa:       /* Timer 0 */
-		case 0xb:       /* Timer 1 */
-		case 0xc:       /* Timer 2 */
-			break;
-		case 0xd:       /* Counter 0 */
-		case 0xe:       /* Counter 1 */
-		case 0xf:       /* Counter 2 */
+		if (!(m_dsp_addr & 0x80))
 		{
-			u8 value = m_ram[0xf0 + offset] & 0x0f;
-			m_ram[0xf0 + offset] = 0;
-			return value;
+			offset = m_dsp_addr & 0x7f;
+			if (offset == 0x7c)
+			{
+				/* Writes to register 0x7c (ENDX) clear ALL bits no matter which value is written */
+				m_dsp_regs[offset & 0x7f] = 0;
+			}
+			else
+			{
+				/* All other writes store the value in the addressed register as expected. */
+				m_dsp_regs[offset & 0x7f] = data;
+			}
 		}
 	}
-
-	return 0;
+	else
+		m_dsp_addr = data;
 }
 
-void snes_sound_device::spc_io_w(offs_t offset, u8 data)
-{
-	switch (offset) /* Offset is from 0x00f0 */
-	{
-		case 0x0:
-			logerror("Warning: write to SOUND TEST register with data %02x!\n", data);
-			break;
-		case 0x1:       /* Control */
-			for (int i = 0; i < 3; i++)
-			{
-				if (BIT(data, i) && m_timer_enabled[i] == false)
-				{
-					m_subcounter[i] = 0;
-					m_counter[i] = 0;
-					m_ram[0xfd + i] = 0;
-				}
-
-				m_timer_enabled[i] = BIT(data, i);
-				//m_timer[i]->enable(m_timer_enabled[i]);
-			}
-
-			if (BIT(data, 4))
-			{
-				m_port_in[0] = 0;
-				m_port_in[1] = 0;
-			}
-
-			if (BIT(data, 5))
-			{
-				m_port_in[2] = 0;
-				m_port_in[3] = 0;
-			}
-
-			/* bit 7 = IPL ROM enable */
-			break;
-		case 0x2:       /* Register address */
-			break;
-		case 0x3:       /* Register data - 0x80-0xff is a read-only mirror of 0x00-0x7f */
-			if (!(m_ram[0xf2] & 0x80))
-				dsp_io_w(m_ram[0xf2] & 0x7f, data);
-			break;
-		case 0x4:       /* Port 0 */
-		case 0x5:       /* Port 1 */
-		case 0x6:       /* Port 2 */
-		case 0x7:       /* Port 3 */
-			// osd_printf_debug("%s SPC: %02x to APU @ %d\n", machine().describe_context(), data, offset & 3);
-			m_port_out[offset - 4] = data;
-			// Unneeded, we already run at perfect_interleave
-			// machine().scheduler().boost_interleave(attotime::zero, attotime::from_usec(20));
-			break;
-		case 0xa:       /* Timer 0 */
-		case 0xb:       /* Timer 1 */
-		case 0xc:       /* Timer 2 */
-			// if 0 then TnDiv is divided by 256, otherwise it's divided by 1 to 255
-			if (data == 0)
-				m_TnDIV[offset - 0xa] = 256;
-			else
-				m_TnDIV[offset - 0xa] = data;
-			break;
-		case 0xd:       /* Counter 0 */
-		case 0xe:       /* Counter 1 */
-		case 0xf:       /* Counter 2 */
-			return;
-	}
-
-	m_ram[0xf0 + offset] = data;
-}
-
-u8 snes_sound_device::spc_ram_r(offs_t offset)
-{
-	/* IPL ROM enabled */
-	if (offset >= 0xffc0 && m_ram[0xf1] & 0x80)
-		return m_ipl_region[offset & 0x3f];
-
-	return m_ram[offset];
-}
-
-void snes_sound_device::spc_ram_w(offs_t offset, u8 data)
-{
-	m_ram[offset] = data;
-}
-
-
-u8 snes_sound_device::spc_port_out(offs_t offset)
-{
-	assert(offset < 4);
-
-	return m_port_out[offset];
-}
-
-void snes_sound_device::spc_port_in(offs_t offset, u8 data)
-{
-	assert(offset < 4);
-
-	m_port_in[offset] = data;
-}
-
-
 /*****************************************************************************
     DEVICE INTERFACE
 *****************************************************************************/
 
-void snes_sound_device::state_register()
+void s_dsp_device::state_register()
 {
+	save_item(NAME(m_dsp_addr));
 	save_item(NAME(m_dsp_regs));
-	save_item(NAME(m_ipl_region));
 
 	save_item(NAME(m_keyed_on));
 	save_item(NAME(m_keys));
@@ -1216,14 +1038,6 @@ void snes_sound_device::state_register()
 	save_item(NAME(m_echo_ptr));
 #endif
 
-	save_item(NAME(m_timer_enabled));
-	save_item(NAME(m_subcounter));
-	save_item(NAME(m_counter));
-	save_item(NAME(m_port_in));
-	save_item(NAME(m_port_out));
-
-	save_item(NAME(m_TnDIV));
-
 	for (int v = 0; v < 8; v++)
 	{
 		save_item(NAME(m_voice_state[v].mem_ptr), v);
@@ -1250,7 +1064,7 @@ void snes_sound_device::state_register()
 //  sound_stream_update - handle a stream update
 //-------------------------------------------------
 
-void snes_sound_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
+void s_dsp_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
 {
 	s16 mix[2];
 
diff --git a/src/mame/audio/snes_snd.h b/src/devices/sound/s_dsp.h
similarity index 64%
rename from src/mame/audio/snes_snd.h
rename to src/devices/sound/s_dsp.h
index 81dffe6024d..934a0a6d88e 100644
--- a/src/mame/audio/snes_snd.h
+++ b/src/devices/sound/s_dsp.h
@@ -2,33 +2,26 @@
 // copyright-holders:R. Belmont, Brad Martin
 /*****************************************************************************
  *
- * audio/snes_snd.h
+ * Nintendo/Sony S-DSP emulation
  *
  ****************************************************************************/
 
-#ifndef MAME_AUDIO_SNES_SND_H
-#define MAME_AUDIO_SNES_SND_H
-
+#ifndef MAME_SOUND_S_DSP_H
+#define MAME_SOUND_S_DSP_H
 
 /***************************************************************************
  TYPE DEFINITIONS
  ***************************************************************************/
 
-class snes_sound_device : public device_t, public device_sound_interface
+class s_dsp_device : public device_t, public device_sound_interface, public device_memory_interface
 {
 public:
-	snes_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+	s_dsp_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
 
 	void set_volume(int volume);
 
-	u8 spc_io_r(offs_t offset);
-	u8 spc_ram_r(offs_t offset);
-	u8 spc_port_out(offs_t offset);
-	void spc_io_w(offs_t offset, u8 data);
-	void spc_ram_w(offs_t offset, u8 data);
-	void spc_port_in(offs_t offset, u8 data);
-
-//  u8 *spc_get_ram() { return m_ram; }
+	u8 dsp_io_r(offs_t offset);
+	void dsp_io_w(offs_t offset, u8 data);
 
 protected:
 	// device-level overrides
@@ -38,9 +31,20 @@ protected:
 
 	// sound stream update overrides
 	virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
-	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
+
+	// device_memory_interface configuration
+	virtual space_config_vector memory_space_config() const override;
+
+	address_space_config m_data_config;
 
 private:
+	address_space                                *m_data;
+	memory_access_cache<0, 0, ENDIANNESS_LITTLE> *m_cache;
+	inline u8 read_byte(offs_t a) { return m_cache->read_byte(a); }
+	inline u16 read_word(offs_t a) { return read_byte(a) | (read_byte(a + 1) << 8); }
+	inline void write_byte(offs_t a, u8 d) { m_data->write_byte(a, d); }
+	inline void write_word(offs_t a, u16 d) { write_byte(a, d & 0xff); write_byte(a + 1, (d >> 8) & 0xff); }
+
 	enum class env_state_t32 : u8
 	{
 		ATTACK,
@@ -49,8 +53,6 @@ private:
 		RELEASE
 	};
 
-	static constexpr unsigned SNES_SPCRAM_SIZE = 0x10000;
-
 	struct voice_state_type                      /* Voice state type             */
 	{
 		u16             mem_ptr;        /* Sample data memory pointer   */
@@ -72,25 +74,23 @@ private:
 		s16             sampbuf[4];     /* Buffer for Gaussian interp   */
 	};
 
-	struct src_dir_type                      /* Source directory entry       */
-	{
-		u16  vptr;           /* Ptr to start of sample data  */
-		u16  lptr;           /* Loop pointer in sample data  */
-	};
+	inline u16 vptr(u8 sd, u8 v) { return read_word((sd << 8) + (m_dsp_regs[v + 4] << 2)); }           /* Ptr to start of sample data  */
+	inline u16 lptr(u8 sd, u8 v) { return read_word((sd << 8) + (m_dsp_regs[v + 4] << 2) + 2); }       /* Loop pointer in sample data  */
+	inline u16 pitch(u8 v) { (m_dsp_regs[v + 2] | (m_dsp_regs[v + 3] << 8)) & 0x3fff; }
+
+	/* Make reading the ADSR code easier */
+	inline u8 SL(u8 v) { return m_dsp_regs[(v << 4) + 6] >> 5; }         /* Returns SUSTAIN level        */
+	inline u8 SR(u8 v) { return m_dsp_regs[(v << 4) + 6] & 0x1f; }       /* Returns SUSTAIN rate         */
 
-	u8 dsp_io_r(offs_t offset);
-	void dsp_io_w(offs_t offset, u8 data);
-//  TIMER_CALLBACK_MEMBER(spc_timer);
 	void dsp_reset();
 	void dsp_update(s16 *sound_ptr);
 	int advance_envelope(int v);
 	void state_register();
 
 	// internal state
-	std::unique_ptr<u8[]> m_ram;
 	sound_stream          *m_channel;
+	u8                    m_dsp_addr;
 	u8                    m_dsp_regs[256];      /* DSP registers */
-	u8                    m_ipl_region[64];     /* SPC top 64 bytes */
 
 	int                   m_keyed_on;
 	int                   m_keys;               /* 8-bits for 8 voices */
@@ -108,25 +108,9 @@ private:
 	int                   m_echo_ptr;
 #endif
 
-	enum
-	{
-		TIMER_TICK_ID = 1
-	};
-	/* timers */
-	emu_timer             *m_tick_timer;
-	bool                  m_timer_enabled[3];
-	u16                   m_counter[3];
-	u8                    m_subcounter[3];
-	inline void update_timer_tick(u8 which);
-
-	/* IO ports */
-	u8                    m_port_in[4];         /* SPC input ports */
-	u8                    m_port_out[4];        /* SPC output ports */
-
-	u16                   m_TnDIV[3]; /**< Timer N Divider */
 };
 
-DECLARE_DEVICE_TYPE(SNES_SOUND, snes_sound_device)
+DECLARE_DEVICE_TYPE(S_DSP, s_dsp_device)
 
 
-#endif // MAME_AUDIO_SNES_SND_H
+#endif // MAME_SOUND_S_DSP_H
diff --git a/src/mame/drivers/nss.cpp b/src/mame/drivers/nss.cpp
index 342521c4536..e18a3675cea 100644
--- a/src/mame/drivers/nss.cpp
+++ b/src/mame/drivers/nss.cpp
@@ -353,12 +353,10 @@ private:
 	virtual void machine_start() override;
 	virtual void machine_reset() override;
 	DECLARE_WRITE_LINE_MEMBER(nss_vblank_irq);
-	DECLARE_READ8_MEMBER(spc_ram_100_r);
-	DECLARE_WRITE8_MEMBER(spc_ram_100_w);
 	void bios_io_map(address_map &map);
 	void bios_map(address_map &map);
 	void snes_map(address_map &map);
-	void spc_mem(address_map &map);
+	void spc_map(address_map &map);
 };
 
 
@@ -374,25 +372,13 @@ uint32_t nss_state::screen_update( screen_device &screen, bitmap_rgb32 &bitmap,
 void nss_state::snes_map(address_map &map)
 {
 	map(0x000000, 0x7dffff).rw(FUNC(nss_state::snes_r_bank1), FUNC(nss_state::snes_w_bank1));
-	map(0x7e0000, 0x7fffff).ram();                 /* 8KB Low RAM, 24KB High RAM, 96KB Expanded RAM */
+	map(0x7e0000, 0x7fffff).ram().share("wram");                 /* 8KB Low RAM, 24KB High RAM, 96KB Expanded RAM */
 	map(0x800000, 0xffffff).rw(FUNC(nss_state::snes_r_bank2), FUNC(nss_state::snes_w_bank2));    /* Mirror and ROM */
 }
 
-READ8_MEMBER(nss_state::spc_ram_100_r)
+void nss_state::spc_map(address_map &map)
 {
-	return m_spc700->spc_ram_r(offset + 0x100);
-}
-
-WRITE8_MEMBER(nss_state::spc_ram_100_w)
-{
-	m_spc700->spc_ram_w(offset + 0x100, data);
-}
-
-void nss_state::spc_mem(address_map &map)
-{
-	map(0x0000, 0x00ef).rw(m_spc700, FUNC(snes_sound_device::spc_ram_r), FUNC(snes_sound_device::spc_ram_w)); /* lower 32k ram */
-	map(0x00f0, 0x00ff).rw(m_spc700, FUNC(snes_sound_device::spc_io_r), FUNC(snes_sound_device::spc_io_w));   /* spc io */
-	map(0x0100, 0xffff).rw(FUNC(nss_state::spc_ram_100_r), FUNC(nss_state::spc_ram_100_w));
+	map(0x0000, 0xffff).ram().share("aram");
 }
 
 /* NSS specific */
@@ -577,7 +563,7 @@ WRITE8_MEMBER(nss_state::port_01_w)
     ---- ---x Maybe SNES CPU/PPU reset?   (0=Reset, 1=Run)
 */
 	m_input_disabled = BIT(data, 7) ^ 1;
-	m_spc700->set_volume((data & 0x20) ? 0.0 : 100.0);
+	m_s_dsp->set_volume((data & 0x20) ? 0.0 : 100.0);
 
 	m_cart_sel = (data & 0xc) >> 2;
 
@@ -587,7 +573,7 @@ WRITE8_MEMBER(nss_state::port_01_w)
 	m_soundcpu->set_input_line(INPUT_LINE_RESET, (data & 1) ? CLEAR_LINE : ASSERT_LINE);
 	/* also reset the device */
 	if (!(data & 1))
-		m_spc700->reset();
+		m_s_dsp->reset();
 }
 
 WRITE8_MEMBER(nss_state::port_02_w)
@@ -839,8 +825,10 @@ void nss_state::nss(machine_config &config)
 	m_maincpu->set_addrmap(AS_PROGRAM, &nss_state::snes_map);
 
 	// runs at 24.576 MHz / 12 = 2.048 MHz
-	SPC700(config, m_soundcpu, XTAL(24'576'000) / 12);
-	m_soundcpu->set_addrmap(AS_PROGRAM, &nss_state::spc_mem);
+	S_SMP(config, m_soundcpu, XTAL(24'576'000) / 12);
+	m_soundcpu->set_addrmap(AS_DATA, &nss_state::spc_map);
+	m_soundcpu->dsp_io_read_callback().set(m_s_dsp, FUNC(s_dsp_device::dsp_io_r));
+	m_soundcpu->dsp_io_write_callback().set(m_s_dsp, FUNC(s_dsp_device::dsp_io_w));
 
 	config.set_perfect_quantum(m_maincpu);
 
@@ -857,9 +845,11 @@ void nss_state::nss(machine_config &config)
 	/* sound hardware */
 	SPEAKER(config, "lspeaker").front_left();
 	SPEAKER(config, "rspeaker").front_right();
-	SNES_SOUND(config, m_spc700, XTAL(24'576'000) / 12);
-	m_spc700->add_route(0, "lspeaker", 1.00);
-	m_spc700->add_route(1, "rspeaker", 1.00);
+
+	S_DSP(config, m_s_dsp, XTAL(24'576'000) / 12);
+	m_s_dsp->set_addrmap(0, &nss_state::spc_map);
+	m_s_dsp->add_route(0, "lspeaker", 1.00);
+	m_s_dsp->add_route(1, "rspeaker", 1.00);
 
 	/* video hardware */
 	/* TODO: the screen should actually superimpose, but for the time being let's just separate outputs */
@@ -892,8 +882,6 @@ void nss_state::nss(machine_config &config)
 ***************************************************************************/
 
 #define NSS_BIOS \
-	ROM_REGION(0x100,           "sound_ipl", 0)     /* IPL ROM */ \
-	ROM_LOAD("spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) ) \
 	ROM_REGION(0x8000,         "bios",  0)      /* Bios CPU */ \
 	ROM_SYSTEM_BIOS( 0, "single", "Nintendo Super System (Single Cart BIOS)" ) \
 	ROMX_LOAD("nss-ic14.02.ic14", 0x00000, 0x8000, CRC(e06cb58f) SHA1(62f507e91a2797919a78d627af53f029c7d81477), ROM_BIOS(0) )   /* bios */ \
diff --git a/src/mame/drivers/sfcbox.cpp b/src/mame/drivers/sfcbox.cpp
index ec46a34fd43..e6a4b7649b5 100644
--- a/src/mame/drivers/sfcbox.cpp
+++ b/src/mame/drivers/sfcbox.cpp
@@ -155,12 +155,10 @@ private:
 	DECLARE_WRITE8_MEMBER( snes_map_1_w );
 	virtual void machine_start() override;
 	virtual void machine_reset() override;
-	DECLARE_READ8_MEMBER(spc_ram_100_r);
-	DECLARE_WRITE8_MEMBER(spc_ram_100_w);
 	void sfcbox_io(address_map &map);
 	void sfcbox_map(address_map &map);
 	void snes_map(address_map &map);
-	void spc_mem(address_map &map);
+	void spc_map(address_map &map);
 };
 
 uint32_t sfcbox_state::screen_update( screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect )
@@ -172,25 +170,13 @@ uint32_t sfcbox_state::screen_update( screen_device &screen, bitmap_rgb32 &bitma
 void sfcbox_state::snes_map(address_map &map)
 {
 	map(0x000000, 0x7dffff).rw(FUNC(sfcbox_state::snes_r_bank1), FUNC(sfcbox_state::snes_w_bank1));
-	map(0x7e0000, 0x7fffff).ram();                 /* 8KB Low RAM, 24KB High RAM, 96KB Expanded RAM */
+	map(0x7e0000, 0x7fffff).ram().share("wram");                 /* 8KB Low RAM, 24KB High RAM, 96KB Expanded RAM */
 	map(0x800000, 0xffffff).rw(FUNC(sfcbox_state::snes_r_bank2), FUNC(sfcbox_state::snes_w_bank2));    /* Mirror and ROM */
 }
 
-READ8_MEMBER(sfcbox_state::spc_ram_100_r)
+void sfcbox_state::spc_map(address_map &map)
 {
-	return m_spc700->spc_ram_r(offset + 0x100);
-}
-
-WRITE8_MEMBER(sfcbox_state::spc_ram_100_w)
-{
-	m_spc700->spc_ram_w(offset + 0x100, data);
-}
-
-void sfcbox_state::spc_mem(address_map &map)
-{
-	map(0x0000, 0x00ef).rw(m_spc700, FUNC(snes_sound_device::spc_ram_r), FUNC(snes_sound_device::spc_ram_w)); /* lower 32k ram */
-	map(0x00f0, 0x00ff).rw(m_spc700, FUNC(snes_sound_device::spc_io_r), FUNC(snes_sound_device::spc_io_w));   /* spc io */
-	map(0x0100, 0xffff).rw(FUNC(sfcbox_state::spc_ram_100_r), FUNC(sfcbox_state::spc_ram_100_w));
+	map(0x0000, 0xffff).ram().share("aram");
 }
 
 void sfcbox_state::sfcbox_map(address_map &map)
@@ -463,8 +449,10 @@ void sfcbox_state::sfcbox(machine_config &config)
 	m_maincpu->set_addrmap(AS_PROGRAM, &sfcbox_state::snes_map);
 
 	// runs at 24.576 MHz / 12 = 2.048 MHz
-	SPC700(config, m_soundcpu, XTAL(24'576'000) / 12);
-	m_soundcpu->set_addrmap(AS_PROGRAM, &sfcbox_state::spc_mem);
+	S_SMP(config, m_soundcpu, XTAL(24'576'000) / 12);
+	m_soundcpu->set_addrmap(AS_DATA, &sfcbox_state::spc_map);
+	m_soundcpu->dsp_io_read_callback().set(m_s_dsp, FUNC(s_dsp_device::dsp_io_r));
+	m_soundcpu->dsp_io_write_callback().set(m_s_dsp, FUNC(s_dsp_device::dsp_io_w));
 
 	config.set_perfect_quantum(m_maincpu);
 
@@ -479,9 +467,11 @@ void sfcbox_state::sfcbox(machine_config &config)
 	/* sound hardware */
 	SPEAKER(config, "lspeaker").front_left();
 	SPEAKER(config, "rspeaker").front_right();
-	SNES_SOUND(config, m_spc700, XTAL(24'576'000) / 12);
-	m_spc700->add_route(0, "lspeaker", 1.00);
-	m_spc700->add_route(1, "rspeaker", 1.00);
+
+	S_DSP(config, m_s_dsp, XTAL(24'576'000) / 12);
+	m_s_dsp->set_addrmap(0, &sfcbox_state::spc_map);
+	m_s_dsp->add_route(0, "lspeaker", 1.00);
+	m_s_dsp->add_route(1, "rspeaker", 1.00);
 
 	/* video hardware */
 	/* TODO: the screen should actually superimpose, but for the time being let's just separate outputs */
@@ -516,8 +506,6 @@ void sfcbox_state::sfcbox(machine_config &config)
 
 #define SFCBOX_BIOS \
 	ROM_REGION( 0x1000000, "maincpu", ROMREGION_ERASE00 ) \
-	ROM_REGION( 0x100, "sound_ipl", 0 ) \
-	ROM_LOAD( "spc700.rom", 0x00, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) ) \
 	ROM_REGION( 0x10000, "krom", 0 ) \
 	ROM_LOAD( "krom1.ic1", 0x00000, 0x10000, CRC(c9010002) SHA1(f4c74086a83b728b1c1af3a021a60efa80eff5a4) ) \
 	ROM_REGION( 0x100000, "user3", 0 ) \
diff --git a/src/mame/drivers/snes.cpp b/src/mame/drivers/snes.cpp
index 9c54f5665c3..851a73bc3e4 100644
--- a/src/mame/drivers/snes.cpp
+++ b/src/mame/drivers/snes.cpp
@@ -28,9 +28,7 @@
 
 #include "emu.h"
 #include "includes/snes.h"
-#include "audio/snes_snd.h"
 
-#include "cpu/spc700/spc700.h"
 #include "machine/snescx4.h"
 
 #include "bus/snes/snes_slot.h"
@@ -92,9 +90,6 @@ private:
 	DECLARE_READ8_MEMBER( pfest94_lo_r );
 	DECLARE_WRITE8_MEMBER( pfest94_lo_w );
 
-	DECLARE_READ8_MEMBER( spc_ram_100_r );
-	DECLARE_WRITE8_MEMBER( spc_ram_100_w );
-
 	// input related
 	SNESCTRL_ONSCREEN_CB(onscreen_cb);
 	SNESCTRL_GUNLATCH_CB(gun_latch_cb);
@@ -122,18 +117,6 @@ private:
  *
  *************************************/
 
-// SPC access
-
-READ8_MEMBER(snes_console_state::spc_ram_100_r )
-{
-	return m_spc700->spc_ram_r(offset + 0x100);
-}
-
-WRITE8_MEMBER(snes_console_state::spc_ram_100_w )
-{
-	m_spc700->spc_ram_w(offset + 0x100, data);
-}
-
 // Memory access for the various types of carts
 
 //---------------------------------------------------------------------------------
@@ -165,7 +148,7 @@ READ8_MEMBER( snes_console_state::snes20_hi_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 			return snes_r_io(space, address);
 		else if (address < 0x8000)
@@ -225,7 +208,7 @@ WRITE8_MEMBER( snes_console_state::snes20_hi_w )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			space.write_byte(0x7e0000 + address, data);
+			m_wram[address] = data;
 		else if (address < 0x6000)
 			snes_w_io(space, address, data);
 	}
@@ -260,7 +243,7 @@ READ8_MEMBER( snes_console_state::snes20_lo_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 			return snes_r_io(space, address);
 		else if (address < 0x8000)
@@ -321,7 +304,7 @@ READ8_MEMBER( snes_console_state::snes21_lo_r )
 	if (offset < 0x400000 && address < 0x8000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 			return snes_r_io(space, address);
 		else
@@ -354,7 +337,7 @@ WRITE8_MEMBER( snes_console_state::snes21_lo_w )
 	if (offset < 0x400000 && address < 0x8000)
 	{
 		if (address < 0x2000)
-			space.write_byte(0x7e0000 + address, data);
+			m_wram[address] = data;
 		else if (address < 0x6000)
 			snes_w_io(space, address, data);
 		else
@@ -383,7 +366,7 @@ READ8_MEMBER( snes_console_state::snes21_hi_r )
 	if (offset < 0x400000 && address < 0x8000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 			return snes_r_io(space, address);
 		else
@@ -416,7 +399,7 @@ WRITE8_MEMBER( snes_console_state::snes21_hi_w )
 	if (offset < 0x400000 && address < 0x8000)
 	{
 		if (address < 0x2000)
-			space.write_byte(0x7e0000 + address, data);
+			m_wram[address] = data;
 		else if (address < 0x6000)
 			snes_w_io(space, address, data);
 		else
@@ -449,7 +432,7 @@ READ8_MEMBER( snes_console_state::snessfx_hi_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 		{
 			if (address >= 0x3000 && address < 0x3300)
@@ -475,7 +458,7 @@ READ8_MEMBER( snes_console_state::snessfx_lo_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 		{
 			if (address >= 0x3000 && address < 0x3300)
@@ -500,7 +483,7 @@ WRITE8_MEMBER( snes_console_state::snessfx_hi_w )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			space.write_byte(0x7e0000 + address, data);
+			m_wram[address] = data;
 		else if (address < 0x6000)
 		{
 			if (address >= 0x3000 && address < 0x3300)
@@ -531,7 +514,7 @@ READ8_MEMBER( snes_console_state::snessa1_hi_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 		{
 			if (address >= 0x2200 && address < 0x2400)
@@ -557,7 +540,7 @@ READ8_MEMBER( snes_console_state::snessa1_lo_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 		{
 			if (address >= 0x2200 && address < 0x2400)
@@ -584,7 +567,7 @@ WRITE8_MEMBER( snes_console_state::snessa1_hi_w )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			space.write_byte(0x7e0000 + address, data);
+			m_wram[address] = data;
 		else if (address < 0x6000)
 		{
 			if (address >= 0x2200 && address < 0x2400)
@@ -618,7 +601,7 @@ READ8_MEMBER( snes_console_state::snes7110_hi_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 		{
 			uint16_t limit = (m_cartslot->get_type() == SNES_SPC7110_RTC) ? 0x4843 : 0x4840;
@@ -647,7 +630,7 @@ READ8_MEMBER( snes_console_state::snes7110_lo_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 		{
 			uint16_t limit = (m_cartslot->get_type() == SNES_SPC7110_RTC) ? 0x4843 : 0x4840;
@@ -683,7 +666,7 @@ WRITE8_MEMBER( snes_console_state::snes7110_lo_w )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			space.write_byte(0x7e0000 + address, data);
+			m_wram[address] = data;
 		else if (address < 0x6000)
 		{
 			uint16_t limit = (m_cartslot->get_type() == SNES_SPC7110_RTC) ? 0x4843 : 0x4840;
@@ -716,7 +699,7 @@ READ8_MEMBER( snes_console_state::snessdd1_lo_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 		{
 			if (address >= 0x4800 && address < 0x4808)
@@ -754,7 +737,7 @@ WRITE8_MEMBER( snes_console_state::snessdd1_hi_w )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			space.write_byte(0x7e0000 + address, data);
+			m_wram[address] = data;
 		else if (address < 0x6000)
 		{
 			if (address >= 0x4300 && address < 0x4380)
@@ -786,7 +769,7 @@ READ8_MEMBER( snes_console_state::snesbsx_hi_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 		{
 			if (address >= 0x2188 && address < 0x21a0)
@@ -814,7 +797,7 @@ WRITE8_MEMBER( snes_console_state::snesbsx_hi_w )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			space.write_byte(0x7e0000 + address, data);
+			m_wram[address] = data;
 		else if (address < 0x6000)
 		{
 			if (address >= 0x2188 && address < 0x21a0)
@@ -847,7 +830,7 @@ READ8_MEMBER( snes_console_state::snesbsx_lo_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 		{
 			if (address >= 0x2188 && address < 0x21a0)
@@ -886,7 +869,7 @@ READ8_MEMBER( snes_console_state::snessgb_hi_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 			return snes_r_io(space, address);
 		else if (address < 0x8000)
@@ -911,7 +894,7 @@ WRITE8_MEMBER( snes_console_state::snessgb_hi_w )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			space.write_byte(0x7e0000 + address, data);
+			m_wram[address] = data;
 		else if (address < 0x6000)
 			snes_w_io(space, address, data);
 		else if (address < 0x8000)
@@ -935,7 +918,7 @@ READ8_MEMBER( snes_console_state::pfest94_hi_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 			return snes_r_io(space, address);
 		else if (address < 0x8000)
@@ -961,7 +944,7 @@ WRITE8_MEMBER( snes_console_state::pfest94_hi_w )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			space.write_byte(0x7e0000 + address, data);
+			m_wram[address] = data;
 		else if (address < 0x6000)
 			snes_w_io(space, address, data);
 		else if (address < 0x8000)
@@ -983,7 +966,7 @@ READ8_MEMBER( snes_console_state::pfest94_lo_r )
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)
-			return space.read_byte(0x7e0000 + address);
+			return m_wram[address];
 		else if (address < 0x6000)
 			return snes_r_io(space, address);
 		else if (address < 0x8000)
@@ -1018,15 +1001,13 @@ WRITE8_MEMBER( snes_console_state::pfest94_lo_w )
 void snes_console_state::snes_map(address_map &map)
 {
 //  map(0x000000, 0x7dffff).rw(FUNC(snes_console_state::snes20_lo_r), FUNC(snes_console_state::snes20_lo_w));
-	map(0x7e0000, 0x7fffff).ram();                                     /* 8KB Low RAM, 24KB High RAM, 96KB Expanded RAM */
+	map(0x7e0000, 0x7fffff).ram().share("wram");                                     /* 8KB Low RAM, 24KB High RAM, 96KB Expanded RAM */
 //  map(0x800000, 0xffffff).rw(FUNC(snes_console_state::snes20_hi_r), FUNC(snes_console_state::snes20_hi_w));
 }
 
 void snes_console_state::spc_map(address_map &map)
 {
-	map(0x0000, 0x00ef).rw(m_spc700, FUNC(snes_sound_device::spc_ram_r), FUNC(snes_sound_device::spc_ram_w)); /* lower 32k ram */
-	map(0x00f0, 0x00ff).rw(m_spc700, FUNC(snes_sound_device::spc_io_r), FUNC(snes_sound_device::spc_io_w));   /* spc io */
-	map(0x0100, 0xffff).rw(FUNC(snes_console_state::spc_ram_100_r), FUNC(snes_console_state::spc_ram_100_w));
+	map(0x0000, 0xffff).ram().share("aram");
 }
 
 
@@ -1340,8 +1321,10 @@ void snes_console_state::snes(machine_config &config)
 	m_maincpu->set_addrmap(AS_PROGRAM, &snes_console_state::snes_map);
 
 	// runs at 24.576 MHz / 12 = 2.048 MHz
-	SPC700(config, m_soundcpu, XTAL(24'576'000) / 12);
-	m_soundcpu->set_addrmap(AS_PROGRAM, &snes_console_state::spc_map);
+	S_SMP(config, m_soundcpu, XTAL(24'576'000) / 12);
+	m_soundcpu->set_addrmap(AS_DATA, &snes_console_state::spc_map);
+	m_soundcpu->dsp_io_read_callback().set(m_s_dsp, FUNC(s_dsp_device::dsp_io_r));
+	m_soundcpu->dsp_io_write_callback().set(m_s_dsp, FUNC(s_dsp_device::dsp_io_w));
 
 	//config.set_maximum_quantum(attotime::from_hz(48000));
 	config.set_perfect_quantum(m_maincpu);
@@ -1365,9 +1348,11 @@ void snes_console_state::snes(machine_config &config)
 	/* sound hardware */
 	SPEAKER(config, "lspeaker").front_left();
 	SPEAKER(config, "rspeaker").front_right();
-	SNES_SOUND(config, m_spc700, XTAL(24'576'000) / 12);
-	m_spc700->add_route(0, "lspeaker", 1.00);
-	m_spc700->add_route(1, "rspeaker", 1.00);
+
+	S_DSP(config, m_s_dsp, XTAL(24'576'000) / 12);
+	m_s_dsp->set_addrmap(0, &snes_console_state::spc_map);
+	m_s_dsp->add_route(0, "lspeaker", 1.00);
+	m_s_dsp->add_route(1, "rspeaker", 1.00);
 
 	SNS_CART_SLOT(config, m_cartslot, MCLK_NTSC, snes_cart, nullptr);
 	m_cartslot->irq_callback().set_inputline(m_maincpu, G65816_LINE_IRQ);
@@ -1399,9 +1384,6 @@ void snes_console_state::snespal(machine_config &config)
 
 ROM_START( snes )
 	ROM_REGION( 0x1000000, "maincpu", ROMREGION_ERASE00 )
-
-	ROM_REGION( 0x100, "sound_ipl", 0 )     /* IPL ROM */
-	ROM_LOAD( "spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) ) /* boot rom */
 ROM_END
 
 #define rom_snespal rom_snes
diff --git a/src/mame/drivers/snesb.cpp b/src/mame/drivers/snesb.cpp
index 1854e3605fc..8490830a4a9 100644
--- a/src/mame/drivers/snesb.cpp
+++ b/src/mame/drivers/snesb.cpp
@@ -192,12 +192,10 @@ private:
 	DECLARE_READ8_MEMBER(snesb_dsw1_r);
 	DECLARE_READ8_MEMBER(snesb_dsw2_r);
 	DECLARE_READ8_MEMBER(snesb_coin_r);
-	DECLARE_READ8_MEMBER(spc_ram_100_r);
-	DECLARE_WRITE8_MEMBER(spc_ram_100_w);
 	DECLARE_MACHINE_RESET(ffight2b);
 	void mcu_io_map(address_map &map);
 	void snesb_map(address_map &map);
-	void spc_mem(address_map &map);
+	void spc_map(address_map &map);
 };
 
 
@@ -332,25 +330,13 @@ READ8_MEMBER(snesb_state::snesb_coin_r)
 void snesb_state::snesb_map(address_map &map)
 {
 	map(0x000000, 0x7dffff).rw(FUNC(snesb_state::snes_r_bank1), FUNC(snesb_state::snes_w_bank1));
-	map(0x7e0000, 0x7fffff).ram();                 /* 8KB Low RAM, 24KB High RAM, 96KB Expanded RAM */
+	map(0x7e0000, 0x7fffff).ram().share("wram");                 /* 8KB Low RAM, 24KB High RAM, 96KB Expanded RAM */
 	map(0x800000, 0xffffff).rw(FUNC(snesb_state::snes_r_bank2), FUNC(snesb_state::snes_w_bank2));    /* Mirror and ROM */
 }
 
-READ8_MEMBER(snesb_state::spc_ram_100_r)
+void snesb_state::spc_map(address_map &map)
 {
-	return m_spc700->spc_ram_r(offset + 0x100);
-}
-
-WRITE8_MEMBER(snesb_state::spc_ram_100_w)
-{
-	m_spc700->spc_ram_w(offset + 0x100, data);
-}
-
-void snesb_state::spc_mem(address_map &map)
-{
-	map(0x0000, 0x00ef).rw(m_spc700, FUNC(snes_sound_device::spc_ram_r), FUNC(snes_sound_device::spc_ram_w)); /* lower 32k ram */
-	map(0x00f0, 0x00ff).rw(m_spc700, FUNC(snes_sound_device::spc_io_r), FUNC(snes_sound_device::spc_io_w));   /* spc io */
-	map(0x0100, 0xffff).rw(FUNC(snesb_state::spc_ram_100_r), FUNC(snesb_state::spc_ram_100_w));
+	map(0x0000, 0xffff).ram().share("aram");
 }
 
 static INPUT_PORTS_START( snes_common )
@@ -821,8 +807,10 @@ void snesb_state::kinstb(machine_config &config)
 
 	/* audio CPU */
 	// runs at 24.576 MHz / 12 = 2.048 MHz
-	SPC700(config, m_soundcpu, XTAL(24'576'000) / 12);
-	m_soundcpu->set_addrmap(AS_PROGRAM, &snesb_state::spc_mem);
+	S_SMP(config, m_soundcpu, XTAL(24'576'000) / 12);
+	m_soundcpu->set_addrmap(AS_DATA, &snesb_state::spc_map);
+	m_soundcpu->dsp_io_read_callback().set(m_s_dsp, FUNC(s_dsp_device::dsp_io_r));
+	m_soundcpu->dsp_io_write_callback().set(m_s_dsp, FUNC(s_dsp_device::dsp_io_w));
 
 	config.set_perfect_quantum(m_maincpu);
 
@@ -839,9 +827,11 @@ void snesb_state::kinstb(machine_config &config)
 	/* sound hardware */
 	SPEAKER(config, "lspeaker").front_left();
 	SPEAKER(config, "rspeaker").front_right();
-	SNES_SOUND(config, m_spc700, XTAL(24'576'000) / 12);
-	m_spc700->add_route(0, "lspeaker", 1.00);
-	m_spc700->add_route(1, "rspeaker", 1.00);
+
+	S_DSP(config, m_s_dsp, XTAL(24'576'000) / 12);
+	m_s_dsp->set_addrmap(0, &snesb_state::spc_map);
+	m_s_dsp->add_route(0, "lspeaker", 1.00);
+	m_s_dsp->add_route(1, "rspeaker", 1.00);
 }
 
 MACHINE_RESET_MEMBER( snesb_state, ffight2b )
@@ -1371,9 +1361,6 @@ ROM_START( kinstb )
 	ROM_LOAD( "3.u16", 0x200000, 0x100000, CRC(7a40f7dd) SHA1(cebe632e8d2d68d0619077cc1e931af73c9a723b) )
 	ROM_LOAD( "4.u17", 0x300000, 0x100000, CRC(3d7564c1) SHA1(392b513991897668d5dd469ac84a34f785895774) )
 
-	ROM_REGION(0x100,           "sound_ipl", 0)
-	ROM_LOAD("spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) )
-
 	ROM_REGION(0x800,           "user6", ROMREGION_ERASEFF)
 ROM_END
 
@@ -1413,9 +1400,6 @@ ROM_START( ffight2b )
 	ROM_CONTINUE(          0x078000, 0x008000 )
 	ROM_LOAD( "ff2_1.u8", 0x100000, 0x040000, CRC(ea315ac1) SHA1(a85de091882d35bc77dc99677511828ff7c20350) )
 
-	ROM_REGION(0x100,           "sound_ipl", 0)
-	ROM_LOAD("spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) )
-
 	ROM_REGION(0x800,           "user6", ROMREGION_ERASEFF)
 ROM_END
 
@@ -1425,9 +1409,6 @@ ROM_START( iron )
 	ROM_LOAD( "5.c10.bin", 0x080000, 0x080000, CRC(0c3a0b5b) SHA1(1e8ab860689137e0e94731f1af2cfc561492b5bd) )
 	ROM_LOAD( "4.c11.bin", 0x100000, 0x040000, CRC(2aa417c7) SHA1(24b375e5bbd4be5dcd31b63ea98fbbadd53d543e) )
 
-	ROM_REGION(0x100,           "sound_ipl", 0)
-	ROM_LOAD("spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) )
-
 	ROM_REGION(0x800,           "user6", ROMREGION_ERASEFF)
 ROM_END
 
@@ -1438,18 +1419,12 @@ ROM_START( denseib )
 	ROM_LOAD( "dj.u16", 0x100000, 0x0080000, CRC(7cb71fd7) SHA1(7673e9dcaabe804e2d637e67eabca1683dad4245) )
 	ROM_LOAD( "dj.u17", 0x180000, 0x0080000, CRC(de29dd89) SHA1(441aefbc7ee64515ee66431ef504e76dc8dc5ca3) )
 
-	ROM_REGION(0x100,           "sound_ipl", 0)
-	ROM_LOAD("spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) )
-
 	ROM_REGION(0x800,           "user6", ROMREGION_ERASEFF)
 ROM_END
 
 ROM_START( denseib2 )
 	ROM_REGION( 0x200000, "user3", ROMREGION_ERASEFF )
 
-	ROM_REGION(0x100,           "sound_ipl", 0)
-	ROM_LOAD("spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) )
-
 	ROM_REGION(0x800,           "user6", ROMREGION_ERASEFF)
 
 	ROM_REGION( 0x200000, "user7", 0 )
@@ -1462,9 +1437,6 @@ ROM_END
 ROM_START( sblast2b )
 	ROM_REGION( 0x180000, "user3", ROMREGION_ERASEFF )
 
-	ROM_REGION(0x100,           "sound_ipl", 0)
-	ROM_LOAD("spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) )
-
 	ROM_REGION(0x800,           "user6", ROMREGION_ERASEFF)
 
 	ROM_REGION( 0x180000, "user7", 0 )
@@ -1511,18 +1483,12 @@ ROM_START( legendsb )
 	ROM_CONTINUE(      0x0f0000, 0x008000 )
 	ROM_CONTINUE(      0x078000, 0x008000 )
 
-	ROM_REGION(0x100,           "sound_ipl", 0)
-	ROM_LOAD("spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) )
-
 	ROM_REGION(0x800,           "user6", ROMREGION_ERASEFF)
 ROM_END
 
 ROM_START( endless )
 	ROM_REGION( 0x200000, "user3", ROMREGION_ERASEFF )
 
-	ROM_REGION(0x100,           "sound_ipl", 0)
-	ROM_LOAD("spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) )
-
 	ROM_REGION(0x800,           "user6", ROMREGION_ERASEFF)
 
 	ROM_REGION( 0x200000, "user7", 0 )
@@ -1535,9 +1501,6 @@ ROM_END
 ROM_START( rushbets )
 	ROM_REGION( 0x200000, "user3", ROMREGION_ERASEFF )
 
-	ROM_REGION(0x100,           "sound_ipl", 0)
-	ROM_LOAD("spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) )
-
 	ROM_REGION(0x800,           "user6", ROMREGION_ERASEFF)
 
 	ROM_REGION( 0x200000, "user7", 0 )
@@ -1550,9 +1513,6 @@ ROM_END
 ROM_START( venom )
 	ROM_REGION( 0x300000, "user3", ROMREGION_ERASEFF )
 
-	ROM_REGION(0x100,           "sound_ipl", 0)
-	ROM_LOAD("spc700.rom", 0, 0x40, CRC(44bb3a40) SHA1(97e352553e94242ae823547cd853eecda55c20f0) )
-
 	ROM_REGION(0x800,           "user6", ROMREGION_ERASEFF)
 
 	ROM_REGION( 0x300000, "user7", 0 )
diff --git a/src/mame/includes/snes.h b/src/mame/includes/snes.h
index cc87ecfef0a..5577d0d0d9c 100644
--- a/src/mame/includes/snes.h
+++ b/src/mame/includes/snes.h
@@ -4,9 +4,9 @@
 #ifndef MAME_INCLUDES_SNES_H
 #define MAME_INCLUDES_SNES_H
 
-#include "cpu/spc700/spc700.h"
 #include "cpu/g65816/g65816.h"
-#include "audio/snes_snd.h"
+#include "machine/s_smp.h"
+#include "sound/s_dsp.h"
 #include "video/snes_ppu.h"
 #include "screen.h"
 
@@ -303,9 +303,10 @@ public:
 		driver_device(mconfig, type, tag),
 		m_maincpu(*this, "maincpu"),
 		m_soundcpu(*this, "soundcpu"),
-		m_spc700(*this, "spc700"),
+		m_s_dsp(*this, "s_dsp"),
 		m_ppu(*this, "ppu"),
-		m_screen(*this, "screen")
+		m_screen(*this, "screen"),
+		m_wram(*this, "wram")
 	{ }
 
 	void init_snes();
@@ -316,6 +317,11 @@ public:
 	uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
 
 protected:
+	virtual void machine_start() override;
+	virtual void machine_reset() override;
+
+	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
+
 	enum
 	{
 		TIMER_NMI_TICK,
@@ -385,11 +391,13 @@ protected:
 
 	/* devices */
 	required_device<_5a22_device> m_maincpu;
-	required_device<spc700_device> m_soundcpu;
-	required_device<snes_sound_device> m_spc700;
+	required_device<s_smp_device> m_soundcpu;
+	required_device<s_dsp_device> m_s_dsp;
 	required_device<snes_ppu_device> m_ppu;
 	required_device<screen_device> m_screen;
 
+	required_shared_ptr<u8> m_wram;
+
 	inline int dma_abus_valid(uint32_t address);
 	inline uint8_t abus_read(address_space &space, uint32_t abus);
 	inline void dma_transfer(address_space &space, uint8_t dma, uint32_t abus, uint16_t bbus);
@@ -432,10 +440,6 @@ protected:
 	DECLARE_DEVICE_IMAGE_LOAD_MEMBER(load_snes_cart);
 	DECLARE_DEVICE_IMAGE_LOAD_MEMBER(load_sufami_cart);
 	void snes_init_timers();
-	virtual void machine_start() override;
-	virtual void machine_reset() override;
-
-	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
 };
 
 /* Special chips, checked at init and used in memory handlers */
diff --git a/src/mame/machine/snes.cpp b/src/mame/machine/snes.cpp
index 60f95f0ebde..de23003f30b 100644
--- a/src/mame/machine/snes.cpp
+++ b/src/mame/machine/snes.cpp
@@ -390,7 +390,7 @@ READ8_MEMBER( snes_state::snes_r_io )
 	// APU is mirrored from 2140 to 217f
 	if (offset >= APU00 && offset < WMDATA)
 	{
-		return m_spc700->spc_port_out(offset & 0x3);
+		return m_soundcpu->spc_port_out_r(offset & 0x3);
 	}
 
 	// DMA accesses are from 4300 to 437f
@@ -404,7 +404,7 @@ READ8_MEMBER( snes_state::snes_r_io )
 	switch (offset) // offset is from 0x000000
 	{
 		case WMDATA:    /* Data to read from WRAM */
-			value = m_maincpu->space(AS_PROGRAM).read_byte(0x7e0000 + m_wram_address++);
+			value = m_wram[m_wram_address++];
 			m_wram_address &= 0x1ffff;
 			return value;
 
@@ -480,7 +480,7 @@ WRITE8_MEMBER( snes_state::snes_w_io )
 	if (offset >= APU00 && offset < WMDATA)
 	{
 //      printf("816: %02x to APU @ %d (PC=%06x)\n", data, offset & 3,m_maincpu->pc());
-		m_spc700->spc_port_in(offset & 0x3, data);
+		m_soundcpu->spc_port_in_w(offset & 0x3, data);
 		machine().scheduler().boost_interleave(attotime::zero, attotime::from_usec(20));
 		return;
 	}
@@ -496,7 +496,7 @@ WRITE8_MEMBER( snes_state::snes_w_io )
 	switch (offset)
 	{
 		case WMDATA:    /* Data to write to WRAM */
-			m_maincpu->space(AS_PROGRAM).write_byte(0x7e0000 + m_wram_address++, data );
+			m_wram[m_wram_address++] = data;
 			m_wram_address &= 0x1ffff;
 			return;
 		case WMADDL:    /* Address to read/write to wram (low) */
@@ -720,7 +720,7 @@ READ8_MEMBER(snes_state::snes_r_bank1)
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)                                           /* Mirror of Low RAM */
-			value = m_maincpu->space(AS_PROGRAM).read_byte(0x7e0000 + address);
+			value = m_wram[address];
 		else if (address < 0x6000)                                      /* I/O */
 			value = snes_r_io(space, address);
 		else if (address < 0x8000)
@@ -831,7 +831,7 @@ WRITE8_MEMBER(snes_state::snes_w_bank1)
 	if (offset < 0x400000)
 	{
 		if (address < 0x2000)                           /* Mirror of Low RAM */
-			m_maincpu->space(AS_PROGRAM).write_byte(0x7e0000 + address, data);
+			m_wram[address] = data;
 		else if (address < 0x6000)                      /* I/O */
 			snes_w_io(space, address, data);
 		else if (address < 0x8000)
@@ -1034,14 +1034,14 @@ void snes_state::snes_init_timers()
 
 void snes_state::snes_init_ram()
 {
-	address_space &cpu0space = m_maincpu->space(AS_PROGRAM);
 	int i;
 
 	/* Init work RAM - 0x55 isn't exactly right but it's close */
 	/* make sure it happens to the 65816 (CPU 0) */
-	for (i = 0; i < (128*1024); i++)
+	const size_t size = m_wram.bytes();
+	for (i = 0; i < size; i++)
 	{
-		cpu0space.write_byte(0x7e0000 + i, 0x55);
+		m_wram[i] = 0x55;
 	}
 
 	/* Inititialize registers/variables */