bus/gameboy: Added partial support for some Chinese multi-game cartridges.

Cartridge RAM features are not implemented yet.

New working software list items
---------------------
gbcolor.xml: New Super Color 145 in 1 (China) [taizou, Vas Crabb]

hash/gbcolor.xml

@@ -26287,8 +26287,8 @@ license:CC0
 		<info name="alt_title" value="2003哈利波特2-消失的密室 ~ 2003 Harry Potter 2 - Xiao Shi De Mi Shi"/>
 		<part name="cart" interface="gameboy_cart">
 			<feature name="slot" value="rom_sintax" />
-			<dataarea name="rom" size="2097152">
+			<dataarea name="rom" size="0x200000">
-				<rom name="2003 ha li bo te 2 - xiao shi de mi shi (unlicensed, chinese) [raw dump].bin" size="2097152" crc="1b3e1243" sha1="0829cbcab3ef5d03c94d5efe769f4f4a93ac47fa"/>
+				<rom name="2003 ha li bo te 2 - xiao shi de mi shi (unlicensed, chinese) [raw dump].bin" size="0x200000" crc="1b3e1243" sha1="0829cbcab3ef5d03c94d5efe769f4f4a93ac47fa"/>
 			</dataarea>
 			<dataarea name="nvram" size="8192" />
 		</part>
@@ -26301,8 +26301,8 @@ license:CC0
 		<info name="alt_title" value="哈利小子IV, 2003哈利小子IV ~ 2003 Ha Li Xiao Zi IV (Cart)"/>
 		<part name="cart" interface="gameboy_cart">
 			<feature name="slot" value="rom_sintax" />
-			<dataarea name="rom" size="2097152">
+			<dataarea name="rom" size="0x200000">
-				<rom name="2003 ha li xiao zi iv (unlicensed, chinese) [raw dump].bin" size="2097152" crc="db3c8b95" sha1="0d230b20388f4396d6345b8eb59f54fc169ad8ee"/>
+				<rom name="2003 ha li xiao zi iv (unlicensed, chinese) [raw dump].bin" size="0x200000" crc="db3c8b95" sha1="0d230b20388f4396d6345b8eb59f54fc169ad8ee"/>
 			</dataarea>
 			<dataarea name="nvram" size="8192">
 			</dataarea>
@@ -26316,8 +26316,8 @@ license:CC0
 		<info name="alt_title" value="女王格鬥2000"/> <!-- translates to "Queen Fight 2000" -->
 		<part name="cart" interface="gameboy_cart">
 			<feature name="slot" value="rom_vf001" />
-			<dataarea name="rom" size="2097152">
+			<dataarea name="rom" size="0x200000">
-				<rom name="Nv Wang Ge Dou 2000 (Unl) [C] [Raw].gbc" size="2097152" crc="e1668b49" sha1="37516139aa317a16440379c1dc00bdfc4c1e607a"/>
+				<rom name="nuwang gedou.gbc" size="0x200000" crc="e1668b49" sha1="37516139aa317a16440379c1dc00bdfc4c1e607a"/>
 			</dataarea>
 		</part>
 	</software>
@@ -26329,8 +26329,8 @@ license:CC0
 		<info name="alt_title" value="超級格鬥2001α"/> <!-- translates to "Super Fight 2001 Alpha" -->
 		<part name="cart" interface="gameboy_cart">
 			<feature name="slot" value="rom_vf001" />
-			<dataarea name="rom" size="2097152">
+			<dataarea name="rom" size="0x200000">
-				<rom name="Chao Ji Ge Dou 2001 Alpha (Unl) [C] [Raw].gbc" size="2097152" crc="afd7a0cc" sha1="f44f629687ec91aade40ff52014587003f728ec9"/>
+				<rom name="chaoju gedou 2001 alpha.gbc" size="0x200000" crc="afd7a0cc" sha1="f44f629687ec91aade40ff52014587003f728ec9"/>
 			</dataarea>
 		</part>
 	</software>
@@ -26345,8 +26345,8 @@ license:CC0
 		<part name="cart" interface="gameboy_cart">
 			<feature name="pcb" value="HK0819" />
 			<feature name="slot" value="rom_newgbchk" />
-			<dataarea name="rom" size="1048576">
+			<dataarea name="rom" size="0x100000">
-				<rom name="koudai guaishou dongzuo pian.gbc" size="1048576" crc="14355371" sha1="f398086d1f8cb435a632e5ea45fb19e980b0568d" />
+				<rom name="koudai guaishou dongzuo pian.gbc" size="0x100000" crc="14355371" sha1="f398086d1f8cb435a632e5ea45fb19e980b0568d" />
 			</dataarea>
 		</part>
 	</software>
@@ -26360,13 +26360,27 @@ license:CC0
 		<part name="cart" interface="gameboy_cart">
 			<feature name="pcb" value="HK0701" />
 			<feature name="slot" value="rom_newgbchk" />
-			<dataarea name="rom" size="1048576">
+			<dataarea name="rom" size="0x100000">
-				<rom name="guaishou go go ii.gbc" size="1048576" crc="b0237467" sha1="8ed6f39a9973d634266806455ef845b6bdb5ab95" />
+				<rom name="guaishou go go ii.gbc" size="0x100000" crc="b0237467" sha1="8ed6f39a9973d634266806455ef845b6bdb5ab95" />
 			</dataarea>
 			<dataarea name="nvram" size="8192" />
 		</part>
 	</software>
 
+	<!-- some games don't work on gbcolor (e.g. 02. KOF98 works on gameboy but not gbcolor) -->
+	<software name="145in1" supported="partial">
+		<description>New Super Color 145 in 1 (China)</description>
+		<year>200?</year>
+		<publisher>J.Y. Company</publisher>
+		<info name="usage" value="Use hard reset to return to game selection menu." />
+		<part name="cart" interface="gameboy_cart">
+			<feature name="slot" value="rom_slmulti" />
+			<dataarea name="rom" size="0x1000000">
+				<rom name="new super color 145 in 1.gbc" size="0x1000000" crc="12345678" sha1="cbeb1745d68163978a422a8d7260a6a0f2693b85" />
+			</dataarea>
+		</part>
+	</software>
+
 	<software name="emodao">
 		<description>E Mo Dao (China, ripped from 8 in 1 multicart)</description>
 		<year>200?</year>
@@ -27601,7 +27615,7 @@ license:CC0
 	used here repeated twice. we need to redump the standalone cart to confirm the size
 	but the 256KB version is definitely underdumped and misses sprite data
 	-->
-		<description>Super Mario 3 Special (China)</description>
+	<description>Super Mario 3 Special (China)</description>
 		<year>2000</year>
 		<publisher>Yong Yong</publisher>
 		<part name="cart" interface="gameboy_cart">

scripts/src/bus.lua

@@ -3719,6 +3719,8 @@ if (BUSES["GAMEBOY"]~=null) then
 		MAME_DIR .. "src/devices/bus/gameboy/mmm01.h",
 		MAME_DIR .. "src/devices/bus/gameboy/rom.cpp",
 		MAME_DIR .. "src/devices/bus/gameboy/rom.h",
+		MAME_DIR .. "src/devices/bus/gameboy/slmulti.cpp",
+		MAME_DIR .. "src/devices/bus/gameboy/slmulti.h",
 		MAME_DIR .. "src/devices/bus/gameboy/slot.cpp",
 		MAME_DIR .. "src/devices/bus/gameboy/slot.h",
 		MAME_DIR .. "src/devices/bus/gameboy/tama5.cpp",

src/devices/bus/gameboy/carts.cpp

@@ -18,6 +18,7 @@
 #include "mbc7.h"
 #include "mmm01.h"
 #include "rom.h"
+#include "slmulti.h"
 #include "tama5.h"
 
 
@@ -53,6 +54,7 @@ char const *const GB_LICHENG        = "rom_licheng";
 char const *const GB_NEWGBCHK       = "rom_newgbchk";
 char const *const GB_VF001          = "rom_vf001";
 char const *const GB_DIGIMON        = "rom_digimon";
+char const *const GB_SLMULTI        = "rom_slmulti";
 
 char const *const MEGADUCK_STD      = "rom";
 char const *const MEGADUCK_BANKED   = "rom_banked";
@@ -95,6 +97,7 @@ void gameboy_cartridges(device_slot_interface &device)
 	device.option_add_internal(slotoptions::GB_NEWGBCHK,        GB_ROM_NEWGBCHK);
 	device.option_add_internal(slotoptions::GB_VF001,           GB_ROM_VF001);
 	device.option_add_internal(slotoptions::GB_DIGIMON,         GB_ROM_DIGIMON);
+	device.option_add_internal(slotoptions::GB_SLMULTI,         GB_ROM_SLMULTI);
 }
 
 

src/devices/bus/gameboy/carts.h

@@ -47,6 +47,7 @@ extern char const *const GB_LICHENG;
 extern char const *const GB_NEWGBCHK;
 extern char const *const GB_VF001;
 extern char const *const GB_DIGIMON;
+extern char const *const GB_SLMULTI;
 
 extern char const *const MEGADUCK_STD;
 extern char const *const MEGADUCK_BANKED;

src/devices/bus/gameboy/gbslot.cpp

@@ -743,6 +743,9 @@ std::optional<char const *> probe_gbx_footer(std::string_view tag, util::random_
 	case gbxfile::TYPE_VF001:
 		result = slotoptions::GB_VF001;
 		break;
+	case gbxfile::TYPE_SLMULTI:
+		result = slotoptions::GB_SLMULTI;
+		break;
 	}
 	if (result)
 	{

src/devices/bus/gameboy/gbxfile.h

@@ -53,6 +53,7 @@ enum : u32
 	TYPE_CAMERA     = 0x43414d52,   // 'CAMR'
 	TYPE_HUC1       = 0x48554331,   // 'HUC1'
 	TYPE_HUC3       = 0x48554333,   // 'HUC3'
+	TYPE_SLMULTI    = 0x4c424d43,   // 'LBMC'
 	TYPE_LICHENG    = 0x4c494348,   // 'LICH'
 	TYPE_M161       = 0x4d313631,   // 'M161'
 	TYPE_MBC1_COLL  = 0x4d42314d,   // 'MB1M'

src/devices/bus/gameboy/mbc6.cpp

@@ -103,7 +103,8 @@ private:
 	void install_ram() ATTR_COLD;
 
 	required_device<intelfsh8_device> m_flash;
-	memory_view m_view_rom[2];
+	memory_view m_view_rom_low;
+	memory_view m_view_rom_high;
 	memory_view m_view_ram;
 	memory_bank_array_creator<2> m_bank_rom;
 	memory_bank_array_creator<2> m_bank_ram;
@@ -126,7 +127,8 @@ mbc6_device::mbc6_device(
 	device_t(mconfig, GB_ROM_MBC6, tag, owner, clock),
 	device_gb_cart_interface(mconfig, *this),
 	m_flash(*this, "flash"),
-	m_view_rom{ { *this, "romlow" }, { *this, "romhigh" } },
+	m_view_rom_low(*this, "romlow"),
+	m_view_rom_high(*this, "romhigh" ),
 	m_view_ram(*this, "ram"),
 	m_bank_rom(*this, { "romlow", "romhigh" }),
 	m_bank_ram(*this, { "ramlow", "ramhigh" }),
@@ -148,8 +150,8 @@ image_init_result mbc6_device::load(std::string &message)
 		return image_init_result::FAIL;
 
 	// install views for ROM/flash and RAM
-	cart_space()->install_view(0x4000, 0x5fff, m_view_rom[0]);
+	cart_space()->install_view(0x4000, 0x5fff, m_view_rom_low);
-	cart_space()->install_view(0x6000, 0x7fff, m_view_rom[1]);
+	cart_space()->install_view(0x6000, 0x7fff, m_view_rom_high);
 	cart_space()->install_view(0xa000, 0xbfff, m_view_ram);
 
 	// set up ROM and RAM as appropriate
@@ -180,11 +182,11 @@ image_init_result mbc6_device::load(std::string &message)
 			write8sm_delegate(*this, FUNC(mbc6_device::select_flash)));
 
 	// install Flash handlers
-	m_view_rom[0][1].install_readwrite_handler(
+	m_view_rom_low[1].install_readwrite_handler(
 			0x4000, 0x5fff,
 			read8sm_delegate(*this, FUNC(mbc6_device::read_flash<0>)),
 			write8sm_delegate(*this, FUNC(mbc6_device::write_flash<0>)));
-	m_view_rom[1][1].install_readwrite_handler(
+	m_view_rom_high[1].install_readwrite_handler(
 			0x6000, 0x7fff,
 			read8sm_delegate(*this, FUNC(mbc6_device::read_flash<1>)),
 			write8sm_delegate(*this, FUNC(mbc6_device::write_flash<1>)));
@@ -227,8 +229,8 @@ void mbc6_device::device_reset()
 	m_flash_enable = 0U;
 	m_flash_writable = 0U;
 
-	m_view_rom[0].select(0);
+	m_view_rom_low.select(0);
-	m_view_rom[1].select(0);
+	m_view_rom_high.select(0);
 	m_view_ram.disable();
 
 	if (m_bank_mask_rom)
@@ -270,6 +272,7 @@ void mbc6_device::write_flash(offs_t offset, u8 data)
 void mbc6_device::bank_switch_rom(offs_t offset, u8 data)
 {
 	auto const bank(BIT(offset, 12));
+	memory_view &view(bank ? m_view_rom_high : m_view_rom_low);
 	m_bank_sel_rom[bank] = data;
 
 	if (!m_flash_select[bank])
@@ -280,11 +283,11 @@ void mbc6_device::bank_switch_rom(offs_t offset, u8 data)
 					"%s: ROM bank %s unmapped\n",
 					machine().describe_context(),
 					bank ? "high" : "low");
-			m_view_rom[bank].disable(); // is there a chip select for a second program ROM?
+			view.disable(); // is there a chip select for a second program ROM?
 		}
 		else
 		{
-			m_view_rom[bank].select(0);
+			view.select(0);
 		}
 	}
 
@@ -304,6 +307,7 @@ void mbc6_device::bank_switch_rom(offs_t offset, u8 data)
 void mbc6_device::select_flash(offs_t offset, u8 data)
 {
 	auto const bank(BIT(offset, 12));
+	memory_view &view(bank ? m_view_rom_high : m_view_rom_low);
 	m_flash_select[bank] = BIT(data, 3);
 	if (m_flash_select[bank])
 	{
@@ -313,9 +317,9 @@ void mbc6_device::select_flash(offs_t offset, u8 data)
 				bank ? "high" : "low",
 				m_flash_enable ? "enabled" : "disabled");
 		if (m_flash_enable)
-			m_view_rom[bank].select(1);
+			view.select(1);
 		else
-			m_view_rom[bank].disable();
+			view.disable();
 	}
 	else if (BIT(m_bank_sel_rom[bank], 7))
 	{
@@ -323,7 +327,7 @@ void mbc6_device::select_flash(offs_t offset, u8 data)
 				"%s: ROM bank %s unmapped\n",
 				machine().describe_context(),
 				bank ? "high" : "low");
-		m_view_rom[bank].disable(); // is there a chip select for a second program ROM?
+		view.disable(); // is there a chip select for a second program ROM?
 	}
 	else
 	{
@@ -331,7 +335,7 @@ void mbc6_device::select_flash(offs_t offset, u8 data)
 				"%s: ROM bank %s selected\n",
 				machine().describe_context(),
 				bank ? "high" : "low");
-		m_view_rom[bank].select(0);
+		view.select(0);
 	}
 
 	// game writes 0xc6 when selecting ROM during boot - what do the other bits do?
@@ -372,17 +376,17 @@ void mbc6_device::enable_flash(u8 data)
 		{
 			LOG("%s: Flash enabled\n", machine().describe_context());
 			if (m_flash_select[0])
-				m_view_rom[0].select(1);
+				m_view_rom_low.select(1);
 			if (m_flash_select[1])
-				m_view_rom[1].select(1);
+				m_view_rom_high.select(1);
 		}
 		else
 		{
 			LOG("%s: Flash disabled\n", machine().describe_context());
 			if (m_flash_select[0])
-				m_view_rom[0].disable();
+				m_view_rom_low.disable();
 			if (m_flash_select[1])
-				m_view_rom[1].disable();
+				m_view_rom_high.disable();
 		}
 
 		if (data & ~0x01)
@@ -484,8 +488,8 @@ void mbc6_device::install_rom()
 	if (!rombytes)
 	{
 		// just avoid fatal errors
-		m_view_rom[0][0];
+		m_view_rom_low[0];
-		m_view_rom[1][0];
+		m_view_rom_high[0];
 		m_bank_mask_rom = 0U;
 	}
 	else if (PAGE_ROM_SIZE >= rombytes)
@@ -507,8 +511,8 @@ void mbc6_device::install_rom()
 							end,
 							mirror);
 					cart_space()->install_rom(begin, end, 0x2000 | mirror, &base[src]);
-					m_view_rom[0][0].install_rom(0x4000 | begin, 0x4000 | end, mirror, &base[src]);
+					m_view_rom_low[0].install_rom(0x4000 | begin, 0x4000 | end, mirror, &base[src]);
-					m_view_rom[1][0].install_rom(0x6000 | begin, 0x6000 | end, mirror, &base[src]);
+					m_view_rom_high[0].install_rom(0x6000 | begin, 0x6000 | end, mirror, &base[src]);
 				});
 		m_bank_mask_rom = 0U;
 	}
@@ -533,8 +537,8 @@ void mbc6_device::install_rom()
 					m_bank_rom[0]->configure_entry(entry, &base[page * PAGE_ROM_SIZE]);
 					m_bank_rom[1]->configure_entry(entry, &base[page * PAGE_ROM_SIZE]);
 				});
-		m_view_rom[0][0].install_read_bank(0x4000, 0x5fff, m_bank_rom[0]);
+		m_view_rom_low[0].install_read_bank(0x4000, 0x5fff, m_bank_rom[0]);
-		m_view_rom[1][0].install_read_bank(0x6000, 0x7fff, m_bank_rom[1]);
+		m_view_rom_high[0].install_read_bank(0x6000, 0x7fff, m_bank_rom[1]);
 	}
 }
 

src/devices/bus/gameboy/slmulti.cpp

@@ -0,0 +1,235 @@
+// license:BSD-3-Clause
+// copyright-holders:Vas Crabb
+/***************************************************************************
+
+ Chinese multi-game cartridges by SL and possibly others
+
+ Supports collections containing very large numbers of games designed for
+ MBC1 and MBC5 cartridges.
+
+ ***************************************************************************/
+
+#include "emu.h"
+#include "slmulti.h"
+
+#include "cartbase.h"
+
+#include <string>
+
+//#define VERBOSE 1
+//#define LOG_OUTPUT_FUNC osd_printf_info
+#include "logmacro.h"
+
+
+namespace bus::gameboy {
+
+namespace {
+
+class slmulti_device : public mbc_dual_uniform_device_base
+{
+public:
+	slmulti_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock);
+
+	virtual image_init_result load(std::string &message) override ATTR_COLD;
+
+protected:
+	virtual void device_start() override ATTR_COLD;
+	virtual void device_reset() override ATTR_COLD;
+
+private:
+	void bank_switch_rom_fine(u8 data);
+	void bank_switch_rom_coarse(u8 data);
+	void set_config_cmd(u8 data);
+	void do_config_cmd(u8 data);
+
+	void update_bank_rom_high()
+	{
+		u16 const page(bank_rom_entry_high());
+		LOG(
+				"%s: Set high ROM page 0x%03X (0x%06X)\n",
+				machine().describe_context(),
+				page,
+				u32(page) << 14);
+		set_bank_rom_high(page);
+	}
+
+	u16 bank_rom_entry_high() const noexcept
+	{
+		u16 const hi(m_high_page & m_page_mask);
+		return (m_base_page & ~m_page_mask) | (hi ? hi : (m_zero_remap & m_page_mask));
+	}
+
+	memory_view m_view_ctrl;
+
+	u16 m_base_page;
+	u16 m_high_page;
+	u16 m_page_mask;
+	u16 m_zero_remap;
+	u8 m_config_cmd;
+};
+
+
+slmulti_device::slmulti_device(
+		machine_config const &mconfig,
+		char const *tag,
+		device_t *owner,
+		u32 clock) :
+	mbc_dual_uniform_device_base(mconfig, GB_ROM_SLMULTI, tag, owner, clock),
+	m_view_ctrl(*this, "ctrl"),
+	m_base_page(0U),
+	m_high_page(0U),
+	m_page_mask(0U),
+	m_zero_remap(0U),
+	m_config_cmd(0U)
+{
+}
+
+
+image_init_result slmulti_device::load(std::string &message)
+{
+	// set up ROM
+	set_bank_bits_rom(10);
+	if (!check_rom(message))
+		return image_init_result::FAIL;
+	install_rom();
+
+	// install memory mapping control handlers
+	cart_space()->install_view(
+			0x2000, 0x7fff,
+			m_view_ctrl);
+	cart_space()->install_write_handler(
+			0x2000, 0x3fff,
+			write8smo_delegate(*this, FUNC(slmulti_device::bank_switch_rom_fine)));
+
+	// this is for MBC5 games
+	m_view_ctrl[0].install_write_handler(
+			0x3000, 0x3fff,
+			write8smo_delegate(*this, FUNC(slmulti_device::bank_switch_rom_coarse)));
+
+	// install configuration handlers over the top
+	m_view_ctrl[1].install_write_handler(
+			0x5000, 0x5fff,
+			write8smo_delegate(*this, FUNC(slmulti_device::set_config_cmd)));
+	m_view_ctrl[1].install_write_handler(
+			0x7000, 0x7fff,
+			write8smo_delegate(*this, FUNC(slmulti_device::do_config_cmd)));
+
+	// do this here - the menu program apparently does a system reset to get into DMG mode
+	m_view_ctrl.select(1);
+
+	// all good
+	return image_init_result::PASS;
+}
+
+
+void slmulti_device::device_start()
+{
+	mbc_dual_uniform_device_base::device_start();
+
+	m_base_page = 0U;
+	m_high_page = 0U;
+	m_page_mask = 1U;
+	m_zero_remap = 0U;
+	m_config_cmd = 0U;
+
+	save_item(NAME(m_base_page));
+	save_item(NAME(m_high_page));
+	save_item(NAME(m_page_mask));
+	save_item(NAME(m_zero_remap));
+	save_item(NAME(m_config_cmd));
+}
+
+
+void slmulti_device::device_reset()
+{
+	mbc_dual_uniform_device_base::device_reset();
+
+	set_bank_rom_low(m_base_page & ~m_page_mask);
+	update_bank_rom_high();
+}
+
+
+void slmulti_device::bank_switch_rom_fine(u8 data)
+{
+	m_high_page = data;
+	update_bank_rom_high();
+}
+
+
+void slmulti_device::bank_switch_rom_coarse(u8 data)
+{
+	// there's no way to specify a 9-bit page mask, so MBC5 games larger than 4 MiB can't be supported
+	LOG("%s Set coarse ROM bank 0x%02X\n", machine().describe_context(), data);
+}
+
+
+void slmulti_device::set_config_cmd(u8 data)
+{
+	LOG("%s: Set configuration command 0x%02X\n", machine().describe_context(), data);
+	m_config_cmd = data;
+}
+
+
+void slmulti_device::do_config_cmd(u8 data)
+{
+	switch (m_config_cmd)
+	{
+	case 0x55:
+		// bit 4 unknown
+		m_base_page = (m_base_page & ~0x0200) | (u16(BIT(data, 3)) << 9);
+		m_page_mask = (2U << BIT(~data, 0, 3)) - 1;
+		switch (BIT(data, 5, 2))
+		{
+		case 0x0: // used for MBC5 games
+			m_zero_remap = 0U;
+			m_view_ctrl.select(0);
+			break;
+		case 0x3: // used for MBC1 games
+			m_zero_remap = 1U;
+			m_view_ctrl.disable();
+			break;
+		default:
+			logerror(
+					"%s: Unknown memory mapping mode 0x%X\n",
+					machine().describe_context(),
+					BIT(data, 5, 2));
+			m_view_ctrl.disable();
+		}
+		LOG(
+				"%s: Set base page = 0x%03X (0x%06X), page mask = 0x%03X, zero remap = 0x%03X%s\n",
+				machine().describe_context(),
+				m_base_page,
+				u32(m_base_page) << 14,
+				m_page_mask,
+				m_zero_remap,
+				BIT(data, 7) ? ", reset" : "");
+		set_bank_rom_low(m_base_page & ~m_page_mask);
+		update_bank_rom_high();
+		if (BIT(data, 7))
+			machine().root_device().reset(); // TODO: expose reset line on cartridge interface
+		break;
+
+	case 0xaa:
+		m_base_page = (m_base_page & ~0x01fe) | (u16(data) << 1);
+		LOG(
+				"%s: Set base page = 0x%03X (0x%06X)\n",
+				machine().describe_context(),
+				m_base_page,
+				u32(m_base_page) << 14);
+		break;
+
+	default:
+		LOG(
+				"%s: Unknown configuration command 0x%02X with argument 0x%02X\n",
+				machine().describe_context(),
+				m_config_cmd,
+				data);
+	}
+}
+
+} // anonymous namespace
+
+} // namespace bus::gameboy
+
+
+DEFINE_DEVICE_TYPE_PRIVATE(GB_ROM_SLMULTI, device_gb_cart_interface, bus::gameboy::slmulti_device, "gb_rom_slmulti", "Game Boy SL Multi-Game Cartridge")

src/devices/bus/gameboy/slmulti.h

@@ -0,0 +1,18 @@
+// license:BSD-3-Clause
+// copyright-holders:Vas Crabb
+/***************************************************************************
+
+ Chinese multi-game cartridges by SL and possibly others
+
+ ***************************************************************************/
+#ifndef MAME_BUS_GAMEBOY_SLMULTI_H
+#define MAME_BUS_GAMEBOY_SLMULTI_H
+
+#pragma once
+
+#include "slot.h"
+
+
+DECLARE_DEVICE_TYPE(GB_ROM_SLMULTI, device_gb_cart_interface)
+
+#endif // MAME_BUS_GAMEBOY_SLMULTI_H