diff --git a/scripts/src/bus.lua b/scripts/src/bus.lua
index 25e66087a4a..b83adb41fae 100644
--- a/scripts/src/bus.lua
+++ b/scripts/src/bus.lua
@@ -2601,6 +2601,8 @@ if (BUSES["SVI_EXPANDER"]~=null) then
 		MAME_DIR .. "src/devices/bus/svi3x8/expander/modules.h",
 		MAME_DIR .. "src/devices/bus/svi3x8/expander/sv601.cpp",
 		MAME_DIR .. "src/devices/bus/svi3x8/expander/sv601.h",
+		MAME_DIR .. "src/devices/bus/svi3x8/expander/sv602.cpp",
+		MAME_DIR .. "src/devices/bus/svi3x8/expander/sv602.h",
 	}
 end
 
diff --git a/src/devices/bus/svi3x8/expander/modules.cpp b/src/devices/bus/svi3x8/expander/modules.cpp
index f613dcf4094..f8da88451e4 100644
--- a/src/devices/bus/svi3x8/expander/modules.cpp
+++ b/src/devices/bus/svi3x8/expander/modules.cpp
@@ -10,4 +10,5 @@
 
 SLOT_INTERFACE_START( svi_expander_modules )
 	SLOT_INTERFACE("sv601", SV601)
+	SLOT_INTERFACE("sv602", SV602)
 SLOT_INTERFACE_END
diff --git a/src/devices/bus/svi3x8/expander/modules.h b/src/devices/bus/svi3x8/expander/modules.h
index 953b7094935..a13e146a26e 100644
--- a/src/devices/bus/svi3x8/expander/modules.h
+++ b/src/devices/bus/svi3x8/expander/modules.h
@@ -13,6 +13,7 @@
 
 #include "emu.h"
 #include "sv601.h"
+#include "sv602.h"
 
 SLOT_INTERFACE_EXTERN( svi_expander_modules );
 
diff --git a/src/devices/bus/svi3x8/expander/sv601.cpp b/src/devices/bus/svi3x8/expander/sv601.cpp
index fadb45f9a26..79538de37ed 100644
--- a/src/devices/bus/svi3x8/expander/sv601.cpp
+++ b/src/devices/bus/svi3x8/expander/sv601.cpp
@@ -9,13 +9,6 @@
 #include "sv601.h"
 
 
-//**************************************************************************
-//  CONSTANTS/MACROS
-//**************************************************************************
-
-#define VERBOSE 0
-
-
 //**************************************************************************
 //  DEVICE DEFINITIONS
 //**************************************************************************
@@ -32,13 +25,13 @@ static MACHINE_CONFIG_FRAGMENT( sv601 )
 	MCFG_SVI_SLOT_INT_HANDLER(WRITELINE(sv601_device, int_w))
 	MCFG_SVI_SLOT_ROMDIS_HANDLER(WRITELINE(sv601_device, romdis_w))
 	MCFG_SVI_SLOT_RAMDIS_HANDLER(WRITELINE(sv601_device, ramdis_w))
-	MCFG_SVI_SLOT_ADD("0", NULL)
-	MCFG_SVI_SLOT_ADD("1", NULL)
-	MCFG_SVI_SLOT_ADD("2", NULL)
-	MCFG_SVI_SLOT_ADD("3", NULL)
-	MCFG_SVI_SLOT_ADD("4", NULL)
-	MCFG_SVI_SLOT_ADD("5", NULL)
-	MCFG_SVI_SLOT_ADD("6", NULL)
+	MCFG_SVI_SLOT_ADD("0", svi_slot_cards, NULL)
+	MCFG_SVI_SLOT_ADD("1", svi_slot_cards, NULL)
+	MCFG_SVI_SLOT_ADD("2", svi_slot_cards, NULL)
+	MCFG_SVI_SLOT_ADD("3", svi_slot_cards, NULL)
+	MCFG_SVI_SLOT_ADD("4", svi_slot_cards, NULL)
+	MCFG_SVI_SLOT_ADD("5", svi_slot_cards, NULL)
+	MCFG_SVI_SLOT_ADD("6", svi_slot_cards, NULL)
 MACHINE_CONFIG_END
 
 machine_config_constructor sv601_device::device_mconfig_additions() const
@@ -70,14 +63,6 @@ void sv601_device::device_start()
 {
 }
 
-//-------------------------------------------------
-//  device_reset - device-specific reset
-//-------------------------------------------------
-
-void sv601_device::device_reset()
-{
-}
-
 
 //**************************************************************************
 //  IMPLEMENTATION
diff --git a/src/devices/bus/svi3x8/expander/sv601.h b/src/devices/bus/svi3x8/expander/sv601.h
index bf1133cfedb..1e0eb86c507 100644
--- a/src/devices/bus/svi3x8/expander/sv601.h
+++ b/src/devices/bus/svi3x8/expander/sv601.h
@@ -47,7 +47,6 @@ public:
 protected:
 	virtual machine_config_constructor device_mconfig_additions() const override;
 	virtual void device_start() override;
-	virtual void device_reset() override;
 
 private:
 	required_device<svi_slot_bus_device> m_slotbus;
diff --git a/src/devices/bus/svi3x8/expander/sv602.cpp b/src/devices/bus/svi3x8/expander/sv602.cpp
new file mode 100644
index 00000000000..f9dbb1bfabe
--- /dev/null
+++ b/src/devices/bus/svi3x8/expander/sv602.cpp
@@ -0,0 +1,77 @@
+// license:GPL-2.0+
+// copyright-holders:Dirk Best
+/***************************************************************************
+
+    SV-602 Single Slot Expander for SVI-318/328
+
+***************************************************************************/
+
+#include "sv602.h"
+
+
+//**************************************************************************
+//  DEVICE DEFINITIONS
+//**************************************************************************
+
+const device_type SV602 = &device_creator<sv602_device>;
+
+//-------------------------------------------------
+//  machine_config_additions - device-specific
+//  machine configurations
+//-------------------------------------------------
+
+static MACHINE_CONFIG_FRAGMENT( sv602 )
+	MCFG_SVI_SLOT_BUS_ADD
+	MCFG_SVI_SLOT_INT_HANDLER(WRITELINE(sv602_device, int_w))
+	MCFG_SVI_SLOT_ROMDIS_HANDLER(WRITELINE(sv602_device, romdis_w))
+	MCFG_SVI_SLOT_RAMDIS_HANDLER(WRITELINE(sv602_device, ramdis_w))
+	MCFG_SVI_SLOT_ADD("0", sv602_slot_cards, NULL)
+MACHINE_CONFIG_END
+
+machine_config_constructor sv602_device::device_mconfig_additions() const
+{
+	return MACHINE_CONFIG_NAME( sv602 );
+}
+
+
+//**************************************************************************
+//  LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+//  sv602_device - constructor
+//-------------------------------------------------
+
+sv602_device::sv602_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+	device_t(mconfig, SV601, "SV-602 Single Slot Expander", tag, owner, clock, "sv602", __FILE__),
+	device_svi_expander_interface(mconfig, *this),
+	m_slotbus(*this, "slotbus")
+{
+}
+
+//-------------------------------------------------
+//  device_start - device-specific startup
+//-------------------------------------------------
+
+void sv602_device::device_start()
+{
+}
+
+
+//**************************************************************************
+//  IMPLEMENTATION
+//**************************************************************************
+
+WRITE_LINE_MEMBER( sv602_device::int_w ) { m_expander->int_w(state); }
+WRITE_LINE_MEMBER( sv602_device::romdis_w ) { m_expander->romdis_w(state); }
+WRITE_LINE_MEMBER( sv602_device::ramdis_w ) { m_expander->ramdis_w(state); }
+
+READ8_MEMBER( sv602_device::mreq_r ) { return m_slotbus->mreq_r(space, offset); }
+WRITE8_MEMBER( sv602_device::mreq_w ) { m_slotbus->mreq_w(space, offset, data); }
+READ8_MEMBER( sv602_device::iorq_r ) { return m_slotbus->iorq_r(space, offset); }
+WRITE8_MEMBER( sv602_device::iorq_w ) { m_slotbus->iorq_w(space, offset, data); }
+
+void sv602_device::bk21_w(int state) { m_slotbus->bk21_w(state); }
+void sv602_device::bk22_w(int state) { m_slotbus->bk22_w(state); }
+void sv602_device::bk31_w(int state) { m_slotbus->bk31_w(state); }
+void sv602_device::bk32_w(int state) { m_slotbus->bk32_w(state); }
diff --git a/src/devices/bus/svi3x8/expander/sv602.h b/src/devices/bus/svi3x8/expander/sv602.h
new file mode 100644
index 00000000000..2026302d293
--- /dev/null
+++ b/src/devices/bus/svi3x8/expander/sv602.h
@@ -0,0 +1,58 @@
+// license:GPL-2.0+
+// copyright-holders:Dirk Best
+/***************************************************************************
+
+    SV-602 Single Slot Expander for SVI-318/328
+
+***************************************************************************/
+
+#pragma once
+
+#ifndef __SVI3X8_EXPANDER_SV602_H__
+#define __SVI3X8_EXPANDER_SV602_H__
+
+#include "emu.h"
+#include "expander.h"
+#include "bus/svi3x8/slot/slot.h"
+
+
+//**************************************************************************
+//  TYPE DEFINITIONS
+//**************************************************************************
+
+// ======================> sv602_device
+
+class sv602_device : public device_t, public device_svi_expander_interface
+{
+public:
+	// construction/destruction
+	sv602_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+	// from slots
+	WRITE_LINE_MEMBER( int_w );
+	WRITE_LINE_MEMBER( romdis_w );
+	WRITE_LINE_MEMBER( ramdis_w );
+
+	// from host
+	virtual DECLARE_READ8_MEMBER( mreq_r ) override;
+	virtual DECLARE_WRITE8_MEMBER( mreq_w ) override;
+	virtual DECLARE_READ8_MEMBER( iorq_r ) override;
+	virtual DECLARE_WRITE8_MEMBER( iorq_w ) override;
+
+	virtual void bk21_w(int state) override;
+	virtual void bk22_w(int state) override;
+	virtual void bk31_w(int state) override;
+	virtual void bk32_w(int state) override;
+
+protected:
+	virtual machine_config_constructor device_mconfig_additions() const override;
+	virtual void device_start() override;
+
+private:
+	required_device<svi_slot_bus_device> m_slotbus;
+};
+
+// device type definition
+extern const device_type SV602;
+
+#endif // __SVI3X8_EXPANDER_SV602_H__
diff --git a/src/devices/bus/svi3x8/slot/cards.cpp b/src/devices/bus/svi3x8/slot/cards.cpp
index 1547443b136..095c2eeaa4e 100644
--- a/src/devices/bus/svi3x8/slot/cards.cpp
+++ b/src/devices/bus/svi3x8/slot/cards.cpp
@@ -16,3 +16,13 @@ SLOT_INTERFACE_START( svi_slot_cards )
 	SLOT_INTERFACE("sv806", SV806)
 	SLOT_INTERFACE("sv807", SV807)
 SLOT_INTERFACE_END
+
+// The single slot expander doesn't support the disk controller, since
+// it requires its own power supply to power the disk drives
+SLOT_INTERFACE_START( sv602_slot_cards )
+	SLOT_INTERFACE("sv802", SV802)
+	SLOT_INTERFACE("sv803", SV803)
+	SLOT_INTERFACE("sv805", SV805)
+	SLOT_INTERFACE("sv806", SV806)
+	SLOT_INTERFACE("sv807", SV807)
+SLOT_INTERFACE_END
diff --git a/src/devices/bus/svi3x8/slot/cards.h b/src/devices/bus/svi3x8/slot/cards.h
index d54b3f11b0b..d27469b08a1 100644
--- a/src/devices/bus/svi3x8/slot/cards.h
+++ b/src/devices/bus/svi3x8/slot/cards.h
@@ -20,5 +20,6 @@
 #include "sv807.h"
 
 SLOT_INTERFACE_EXTERN( svi_slot_cards );
+SLOT_INTERFACE_EXTERN( sv602_slot_cards );
 
 #endif // __SVI3X8_SLOT_CARDS_H__
diff --git a/src/devices/bus/svi3x8/slot/slot.h b/src/devices/bus/svi3x8/slot/slot.h
index e41e6c107f1..f7f2be940ef 100644
--- a/src/devices/bus/svi3x8/slot/slot.h
+++ b/src/devices/bus/svi3x8/slot/slot.h
@@ -49,9 +49,9 @@
 #define MCFG_SVI_SLOT_BUS_ADD \
 	MCFG_DEVICE_ADD("slotbus", SVI_SLOT_BUS, 0)
 
-#define MCFG_SVI_SLOT_ADD(_tag, _def_slot) \
+#define MCFG_SVI_SLOT_ADD(_tag, _slot_intf, _def_slot) \
 	MCFG_DEVICE_ADD(_tag, SVI_SLOT, 0) \
-	MCFG_DEVICE_SLOT_INTERFACE(svi_slot_cards, _def_slot, false) \
+	MCFG_DEVICE_SLOT_INTERFACE(_slot_intf, _def_slot, false) \
 	svi_slot_device::set_bus(*device, owner, "slotbus");
 
 #define MCFG_SVI_SLOT_INT_HANDLER(_devcb) \