diff --git a/hash/sms.xml b/hash/sms.xml
index 69e92c607be..b1754d3ccf4 100644
--- a/hash/sms.xml
+++ b/hash/sms.xml
@@ -7587,7 +7587,23 @@
 		</part>
 	</software>
 
-
+  <!-- This MASK rom was actually found on a larger arcade multi-game but appears to have been taken directly from a home cartridge.
+       The menu contained within it, and bank switching system used is ignored by the arcade board which just makes use of the game
+       data from it -->
+	<software name="smssgame">
+		<description>Super Game 11-in-1 (Kor)</description>
+		<year>1990</year>
+		<publisher>Seo Jin</publisher>
+		<part name="cart" interface="sms_cart">
+      <feature name="slot" value="seojin" />
+			<dataarea name="rom" size="0x080000">
+				<rom name="SG11004A 79ST0086END 9045" size="0x080000" crc="cdbfe86e" sha1="83d6f261471dca20f8d2e33b9807d670e9b4eb9c" offset="000000" />
+			</dataarea>
+			<dataarea name="ram" size="16384">
+			</dataarea> 
+		</part>
+	</software>
+    
 <!-- The next items have been compiled from original source code written by Jeroen Tel.
   It is unsure if Probe has ever written any game code for these licensed titles -->
 
diff --git a/src/devices/bus/sega8/rom.cpp b/src/devices/bus/sega8/rom.cpp
index 096369826b2..aaa4ad0a02b 100644
--- a/src/devices/bus/sega8/rom.cpp
+++ b/src/devices/bus/sega8/rom.cpp
@@ -40,6 +40,7 @@ const device_type SEGA8_ROM_JANGGUN = &device_creator<sega8_janggun_device>;
 const device_type SEGA8_ROM_HICOM = &device_creator<sega8_hicom_device>;
 const device_type SEGA8_ROM_KOREAN = &device_creator<sega8_korean_device>;
 const device_type SEGA8_ROM_KOREAN_NB = &device_creator<sega8_korean_nb_device>;
+const device_type SEGA8_ROM_SEOJIN = &device_creator<sega8_seojin_device>;
 
 
 
@@ -170,6 +171,12 @@ sega8_korean_nb_device::sega8_korean_nb_device(const machine_config &mconfig, co
 }
 
 
+sega8_seojin_device::sega8_seojin_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
+					: sega8_rom_device(mconfig, SEGA8_ROM_SEOJIN, "SMS Seo Jin Multi-cart", tag, owner, clock, "sega8_seojin", __FILE__)
+{
+}
+
+
 void sega8_rom_device::device_start()
 {
 	save_item(NAME(m_rom_bank_base));
@@ -938,3 +945,76 @@ WRITE8_MEMBER(sega8_korean_device::write_cart)
 	if (offset == 0xa000)
 		m_rom_bank_base[2] = data % m_rom_page_count;
 }
+
+/*-------------------------------------------------
+
+ Seo Jin Multi-Carts
+ have regular style bank switching with an overall
+ 'game select' register at 0xfff0
+
+ -------------------------------------------------*/
+
+
+void sega8_seojin_device::device_start()
+{
+	sega8_rom_device::device_start();
+	save_item(NAME(m_gamesel));
+	m_readxor = 0x80;
+}
+
+void sega8_seojin_device::device_reset()
+{
+	sega8_rom_device::device_reset();
+	m_gamesel = 0;
+	late_bank_setup();
+}
+
+
+READ8_MEMBER(sega8_seojin_device::read_cart)
+{
+	int bank = offset / 0x4000;
+
+	if (offset < 0x400) // first 1k is hardcoded
+		return m_rom[((m_gamesel&0xf)*0x8000)+offset]^m_readxor;
+
+	int bank_to_use = (((m_gamesel&0xf) << 1) | m_rom_bank_base[bank]) % m_rom_page_count;
+
+	return m_rom[bank_to_use * 0x4000 + (offset & 0x3fff)]^m_readxor;
+}
+
+WRITE8_MEMBER(sega8_seojin_device::write_cart)
+{
+}
+
+WRITE8_MEMBER(sega8_seojin_device::write_mapper)
+{
+	switch (offset)
+	{
+		case 0:
+			break;
+
+		case 1: // Select 16k ROM bank for 0000-3fff
+		case 2: // Select 16k ROM bank for 4000-7fff
+		case 3: // Select 16k ROM bank for 8000-bfff
+			m_rom_bank_base[offset - 1] = data;
+			break;
+	}
+}
+
+// it might not have RAM inside, but the only way to get 0xfff0 to fall through to the cart with the current hook-up
+// is by saying there is.
+WRITE8_MEMBER(sega8_seojin_device::write_ram)
+{
+	m_ram[offset & 0x3fff] = data;
+
+	if (offset == 0x3ff0)
+	{
+		m_gamesel = data;
+	}
+}
+
+READ8_MEMBER(sega8_seojin_device::read_ram)
+{
+	return m_ram[offset & 0x3fff];
+}
+
diff --git a/src/devices/bus/sega8/rom.h b/src/devices/bus/sega8/rom.h
index ef3448a8428..a4b7df2599b 100644
--- a/src/devices/bus/sega8/rom.h
+++ b/src/devices/bus/sega8/rom.h
@@ -365,6 +365,30 @@ public:
 };
 
 
+// ======================> sega8_seojin_device
+
+class sega8_seojin_device : public sega8_rom_device
+{
+public:
+	// construction/destruction
+	sega8_seojin_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
+
+	// device-level overrides
+	virtual void device_start() override;
+	virtual void device_reset() override;
+
+	// reading and writing
+	virtual DECLARE_READ8_MEMBER(read_cart) override;
+	virtual DECLARE_WRITE8_MEMBER(write_cart) override;
+	virtual DECLARE_WRITE8_MEMBER(write_mapper) override;
+	virtual DECLARE_READ8_MEMBER(read_ram) override;
+	virtual DECLARE_WRITE8_MEMBER(write_ram) override;
+
+protected:
+	uint8_t m_gamesel;
+	uint8_t m_readxor;
+};
+
 
 // device type definition
 extern const device_type SEGA8_ROM_STD;
@@ -384,5 +408,6 @@ extern const device_type SEGA8_ROM_JANGGUN;
 extern const device_type SEGA8_ROM_HICOM;
 extern const device_type SEGA8_ROM_KOREAN;
 extern const device_type SEGA8_ROM_KOREAN_NB;
+extern const device_type SEGA8_ROM_SEOJIN;
 
 #endif
diff --git a/src/devices/bus/sega8/sega8_slot.cpp b/src/devices/bus/sega8/sega8_slot.cpp
index 8a40d997421..92fc594389d 100644
--- a/src/devices/bus/sega8/sega8_slot.cpp
+++ b/src/devices/bus/sega8/sega8_slot.cpp
@@ -183,7 +183,8 @@ static const sega8_slot slot_list[] =
 	{ SEGA8_BASIC_L3, "level3" },
 	{ SEGA8_MUSIC_EDITOR, "music_editor" },
 	{ SEGA8_DAHJEE_TYPEA, "dahjee_typea" },
-	{ SEGA8_DAHJEE_TYPEB, "dahjee_typeb" }
+	{ SEGA8_DAHJEE_TYPEB, "dahjee_typeb" },
+	{ SEGA8_SEOJIN, "seojin" }
 };
 
 static int sega8_get_pcb_id(const char *slot)
@@ -831,6 +832,7 @@ SLOT_INTERFACE_START(sg1000mk3_cart)
 	SLOT_INTERFACE_INTERNAL("hicom",  SEGA8_ROM_HICOM)
 	SLOT_INTERFACE_INTERNAL("korean",  SEGA8_ROM_KOREAN)
 	SLOT_INTERFACE_INTERNAL("korean_nb",  SEGA8_ROM_KOREAN_NB)
+	SLOT_INTERFACE_INTERNAL("seojin",  SEGA8_ROM_SEOJIN)
 	SLOT_INTERFACE_INTERNAL("othello",  SEGA8_ROM_OTHELLO)
 	SLOT_INTERFACE_INTERNAL("castle",  SEGA8_ROM_CASTLE)
 	SLOT_INTERFACE_INTERNAL("dahjee_typea",  SEGA8_ROM_DAHJEE_TYPEA)
diff --git a/src/devices/bus/sega8/sega8_slot.h b/src/devices/bus/sega8/sega8_slot.h
index 85ab4a2cb96..36181a547e7 100644
--- a/src/devices/bus/sega8/sega8_slot.h
+++ b/src/devices/bus/sega8/sega8_slot.h
@@ -29,7 +29,8 @@ enum
 	SEGA8_BASIC_L3,
 	SEGA8_MUSIC_EDITOR,
 	SEGA8_DAHJEE_TYPEA,
-	SEGA8_DAHJEE_TYPEB
+	SEGA8_DAHJEE_TYPEB,
+	SEGA8_SEOJIN
 };
 
 
diff --git a/src/mame/drivers/sms_bootleg.cpp b/src/mame/drivers/sms_bootleg.cpp
index f97bbef6c1d..b9aa5a66d14 100644
--- a/src/mame/drivers/sms_bootleg.cpp
+++ b/src/mame/drivers/sms_bootleg.cpp
@@ -296,7 +296,7 @@ ROM_START( smssgame )
 	ROM_LOAD( "K1.bin",  0x140000, 0x20000, CRC(dadffecd) SHA1(68ebb968539049a9e193da5200856b9f956f7e02) ) // Final Bubble Bobble (2/2)
 
 	// this mask rom appears to be taken straight from an SMS multi-game cart, bank 0 of it is even a menu just for the games in this ROM! same style, so presumably the same developer (Seo Jin 1990 copyright)
-	ROM_LOAD( "SG11004A 79ST0086END 9045.rom4",0x180000, 0x080000, CRC(cb6cbe40) SHA1(f7735f3357bb89ad2918c28eafeaf9808532f599) )
+	ROM_LOAD( "SG11004A 79ST0086END 9045.rom4",0x180000, 0x080000, CRC(cdbfe86e) SHA1(83d6f261471dca20f8d2e33b9807d670e9b4eb9c) )
 
 	// there seems to be some kind of MCU for the timer?
 ROM_END
diff --git a/src/mame/machine/sms.cpp b/src/mame/machine/sms.cpp
index 4b7a6b0da18..1dc3827b811 100644
--- a/src/mame/machine/sms.cpp
+++ b/src/mame/machine/sms.cpp
@@ -963,7 +963,8 @@ void sms_state::setup_media_slots()
 		if (m_cartslot->get_type() == SEGA8_BASIC_L3 ||
 			m_cartslot->get_type() == SEGA8_MUSIC_EDITOR ||
 			m_cartslot->get_type() == SEGA8_DAHJEE_TYPEA ||
-			m_cartslot->get_type() == SEGA8_DAHJEE_TYPEB)
+			m_cartslot->get_type() == SEGA8_DAHJEE_TYPEB ||
+			m_cartslot->get_type() == SEGA8_SEOJIN)
 		{
 			m_mem_device_enabled |= ENABLE_EXT_RAM;
 		}