// license:BSD-3-Clause // copyright-holders:Wilbert Pol /* Emulation of memory expansions for the MSX system. Standard 16K RAM expansions: - Addcom ADMSM 301 - Casio OR-216 - General RJ-102 - Hitachi MP-RA01H - Mitsubishi ML-16RAM - National CF-2131 - Philips VU 0031 - Sanyo MRP-16 - Sony HBM-16 - Toshiba HX-M250 Standard 32K RAM expansions: - Addcom ADMSM 302 - Pioneer PX-RA32 - Yamaha URM-01 Standard 48K RAM expansions: - Addcom ADMSM 303 - Neos RM-48 Standard 64K RAM expansions: - Casio OR-264 - Philips VU 0034 - Sanyo Memoire Ram 64Ko - Sanyo MRP-64 - Sharp-Epcom HB-4100 - Sony HBM-64 - Spectravideo SVI-747 - Toshiba HX-M251 - Walther Miller WM 0587 Not supported: - Fujitsu MB22451 - Fujitsu FM-X only, adds 16K memory and a printer port - Yamaha SRE-01 - 60pin 32K memory expansion - Yamaha SRM-01 - 60pin 32K memory expansion and slot expander 256KB Memmory Mapper expansions - R. & J.Jansen Memory Mapper 256 512KB Memory Mapper expansions - Green MSX WBM512 - Hardware Partners TM 512KB - HSH RE-512 MM - Padial LPE-512KBSRAM-V3 - R. & J.Jansen Memory Mapper 512 - Sony HBM-512 768KB Memory Mapper expansions - ASCII MEM-768 1MB Memory Mapper expansions - 8bits4ever MEGA-MAPPER 1024KB - Digital KC MSX Memory Mapper 1024KB - Hardware Partners TM 1M - MK MSX Memory Mapper 1024KB - MSX Club Gouda Memory Mapper 1MB - Popolon MSX Memory Mapper 2MB Memory Mapper expansions - 8bits4ever MEGA-MAPPER 2048KB - Digital KC MSX Memory Mapper 2048KB - MFP Extended Memory-2048K - MK MSX Memory Mapper 2048KB - MSX Club Gouda Memory Mapper 2MB 4MB Memory Mapper expansions - 8bits4ever MEGA-MAPPER 4096KB - Digital KC MSX Memory Mapper 4096KB - MK MSX Memory Mapper 4096KB - MSX Club Gouda Memory Mapper 4MB - Padial LPE-4MB-V42KP - T.N.S. Addram - Tecnobytes Double RAM Known issues/problems: - Switching Tecnobytes Double RAM from Memory Mapper to MegaRAM mode will cause the emulation to look up when the system is using the Double RAM as main memory. It is unknown if this also happens on a real system. TODO: - Unknown which parts of memory are used for the MegaRAM 8KB pages. Not supported memory mappers: - 8bits4ever SD-512 - RBSC Carnivore2 - Classic PC 16MB Expansion Memory - 4 x 4MB memory mapper - GR8NET - MSX Cartridge Shop MegaFlashROM SCC+ SD - Padial LPE-4FMB-V8SKP - 4MB memory mapper + MegaRam mode - Playsonic - 4MB memory mapper, up to 16MB through extra register - Stichting CODE MCR-025 - 256KB memory mapper + RAM Disk + Printer buffer - Stichting CODE MCR-051 - 512KB memory mapper + RAM Disk + Printer buffer - Stichting CODE MCR-076 - 768KB memory mapper + RAM Disk + Printer buffer - Stichting CODE MCR-102 - 1MB memory mapper + RAM Disk + Printer buffer - Stichting CODE MCR-204 - 2MB memory mapper + RAM Disk + Printer buffer */ #include "emu.h" #include "ram.h" #include "slotoptions.h" #include "bus/msx/slot/cartridge.h" #include "bus/generic/slot.h" #include "sound/sn76496.h" DECLARE_DEVICE_TYPE(MSX_CART_16K_RAM, msx_cart_interface) DECLARE_DEVICE_TYPE(MSX_CART_32K_RAM, msx_cart_interface) DECLARE_DEVICE_TYPE(MSX_CART_48K_RAM, msx_cart_interface) DECLARE_DEVICE_TYPE(MSX_CART_64K_RAM, msx_cart_interface) DECLARE_DEVICE_TYPE(MSX_CART_256K_MM_RAM, msx_cart_interface) DECLARE_DEVICE_TYPE(MSX_CART_512K_MM_RAM, msx_cart_interface) DECLARE_DEVICE_TYPE(MSX_CART_768K_MM_RAM, msx_cart_interface) DECLARE_DEVICE_TYPE(MSX_CART_1024K_MM_RAM, msx_cart_interface) DECLARE_DEVICE_TYPE(MSX_CART_2048K_MM_RAM, msx_cart_interface) DECLARE_DEVICE_TYPE(MSX_CART_4096K_MM_RAM, msx_cart_interface) DECLARE_DEVICE_TYPE(MSX_CART_DOUBLE_RAM, msx_cart_interface) DECLARE_DEVICE_TYPE(MSX_CART_MMM, msx_cart_interface) void msx_cart_ram_register_options(device_slot_interface &device) { using namespace bus::msx::cart; device.option_add(slotoptions::RAM16K, MSX_CART_16K_RAM); device.option_add(slotoptions::RAM32K, MSX_CART_32K_RAM); device.option_add(slotoptions::RAM48K, MSX_CART_48K_RAM); device.option_add(slotoptions::RAM64K, MSX_CART_64K_RAM); device.option_add(slotoptions::MM256K, MSX_CART_256K_MM_RAM); device.option_add(slotoptions::MM512K, MSX_CART_512K_MM_RAM); device.option_add(slotoptions::MM768K, MSX_CART_768K_MM_RAM); device.option_add(slotoptions::MM1024K, MSX_CART_1024K_MM_RAM); device.option_add(slotoptions::MM2048K, MSX_CART_2048K_MM_RAM); device.option_add(slotoptions::MM4096K, MSX_CART_4096K_MM_RAM); device.option_add(slotoptions::DOUBLE_RAM, MSX_CART_DOUBLE_RAM); device.option_add(slotoptions::MMM, MSX_CART_MMM); } namespace { class msx_cart_base_ram_device : public device_t, public msx_cart_interface { protected: msx_cart_base_ram_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, u32 ram_size) : device_t(mconfig, type, tag, owner, clock) , msx_cart_interface(mconfig, *this) , m_ram_size(ram_size) { } virtual void device_start() override { m_ram = std::make_unique(m_ram_size); save_pointer(NAME(m_ram), m_ram_size); } u8 *ram_data() { return m_ram.get(); } u32 get_ram_size() const { return m_ram_size; } private: std::unique_ptr m_ram; const u32 m_ram_size; }; class msx_cart_16k_ram_device : public msx_cart_base_ram_device { public: msx_cart_16k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : msx_cart_base_ram_device(mconfig, MSX_CART_16K_RAM, tag, owner, clock, 16 * 1024) { } protected: virtual void device_start() override { msx_cart_base_ram_device::device_start(); page(2)->install_ram(0x8000, 0xbfff, ram_data()); } }; class msx_cart_32k_ram_device : public msx_cart_base_ram_device { public: msx_cart_32k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : msx_cart_base_ram_device(mconfig, MSX_CART_32K_RAM, tag, owner, clock, 32 * 1024) { } protected: virtual void device_start() override { msx_cart_base_ram_device::device_start(); page(0)->install_ram(0x0000, 0x3fff, ram_data()); page(1)->install_ram(0x4000, 0x7fff, ram_data() + 0x4000); } }; class msx_cart_48k_ram_device : public msx_cart_base_ram_device { public: msx_cart_48k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : msx_cart_base_ram_device(mconfig, MSX_CART_48K_RAM, tag, owner, clock, 48 * 1024) { } protected: virtual void device_start() override { msx_cart_base_ram_device::device_start(); page(0)->install_ram(0x0000, 0x3fff, ram_data()); page(1)->install_ram(0x4000, 0x7fff, ram_data() + 0x4000); page(2)->install_ram(0x8000, 0xbfff, ram_data() + 0x8000); } }; class msx_cart_64k_ram_device : public msx_cart_base_ram_device { public: msx_cart_64k_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : msx_cart_base_ram_device(mconfig, MSX_CART_64K_RAM, tag, owner, clock, 64 * 1024) { } protected: virtual void device_start() override { msx_cart_base_ram_device::device_start(); page(0)->install_ram(0x0000, 0x3fff, ram_data()); page(1)->install_ram(0x4000, 0x7fff, ram_data() + 0x4000); page(2)->install_ram(0x8000, 0xbfff, ram_data() + 0x8000); page(3)->install_ram(0xc000, 0xffff, ram_data() + 0xc000); } }; class msx_cart_base_mm_ram_device : public msx_cart_base_ram_device { protected: msx_cart_base_mm_ram_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock, u32 ram_size) : msx_cart_base_ram_device(mconfig, type, tag, owner, clock, ram_size) , m_rambank(*this, "rambank%u", 0U) , m_bank_mask(0) { } virtual void device_start() override ATTR_COLD; template void bank_w(u8 data); memory_bank_array_creator<4> m_rambank; u8 m_bank_mask; }; void msx_cart_base_mm_ram_device::device_start() { msx_cart_base_ram_device::device_start(); m_bank_mask = device_generic_cart_interface::map_non_power_of_two( unsigned(get_ram_size() / 0x4000), [this] (unsigned entry, unsigned page) { for (int i = 0; i < 4; i++) m_rambank[i]->configure_entry(entry, ram_data() + 0x4000 * page); } ); // The MSX system allows multiple devices to react to I/O, so we use taps. io_space().install_write_tap(0xfc, 0xfc, "bank0", [this] (offs_t, u8& data, u8){ this->bank_w<0>(data); }); io_space().install_write_tap(0xfd, 0xfd, "bank1", [this] (offs_t, u8& data, u8){ this->bank_w<1>(data); }); io_space().install_write_tap(0xfe, 0xfe, "bank2", [this] (offs_t, u8& data, u8){ this->bank_w<2>(data); }); io_space().install_write_tap(0xff, 0xff, "bank3", [this] (offs_t, u8& data, u8){ this->bank_w<3>(data); }); page(0)->install_readwrite_bank(0x0000, 0x3fff, m_rambank[0]); page(1)->install_readwrite_bank(0x4000, 0x7fff, m_rambank[1]); page(2)->install_readwrite_bank(0x8000, 0xbfff, m_rambank[2]); page(3)->install_readwrite_bank(0xc000, 0xffff, m_rambank[3]); m_rambank[0]->set_entry(3); m_rambank[1]->set_entry(2); m_rambank[2]->set_entry(1); m_rambank[3]->set_entry(0); } template void msx_cart_base_mm_ram_device::bank_w(u8 data) { m_rambank[Bank]->set_entry(data & m_bank_mask); } class msx_cart_256k_mm_ram_device : public msx_cart_base_mm_ram_device { public: msx_cart_256k_mm_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : msx_cart_base_mm_ram_device(mconfig, MSX_CART_256K_MM_RAM, tag, owner, clock, 256 * 1024) { } }; class msx_cart_512k_mm_ram_device : public msx_cart_base_mm_ram_device { public: msx_cart_512k_mm_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : msx_cart_base_mm_ram_device(mconfig, MSX_CART_512K_MM_RAM, tag, owner, clock, 512 * 1024) { } }; class msx_cart_768k_mm_ram_device : public msx_cart_base_mm_ram_device { public: msx_cart_768k_mm_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : msx_cart_base_mm_ram_device(mconfig, MSX_CART_768K_MM_RAM, tag, owner, clock, 768 * 1024) { } }; class msx_cart_1024k_mm_ram_device : public msx_cart_base_mm_ram_device { public: msx_cart_1024k_mm_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : msx_cart_base_mm_ram_device(mconfig, MSX_CART_1024K_MM_RAM, tag, owner, clock, 1024 * 1024) { } }; class msx_cart_2048k_mm_ram_device : public msx_cart_base_mm_ram_device { public: msx_cart_2048k_mm_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : msx_cart_base_mm_ram_device(mconfig, MSX_CART_2048K_MM_RAM, tag, owner, clock, 2048 * 1024) { } }; class msx_cart_4096k_mm_ram_device : public msx_cart_base_mm_ram_device { public: msx_cart_4096k_mm_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : msx_cart_base_mm_ram_device(mconfig, MSX_CART_4096K_MM_RAM, tag, owner, clock, 4096 * 1024) { } }; class msx_cart_mmm_device : public msx_cart_base_mm_ram_device { public: msx_cart_mmm_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : msx_cart_base_mm_ram_device(mconfig, MSX_CART_MMM, tag, owner, clock, 1024 * 1024) , m_sn76489a(*this, "sn76489a") , m_access_enabled(false) , m_sn76489_enabled(false) { } protected: virtual void device_start() override ATTR_COLD; virtual void device_add_mconfig(machine_config &config) override ATTR_COLD; private: required_device m_sn76489a; bool m_access_enabled; bool m_sn76489_enabled; }; void msx_cart_mmm_device::device_start() { msx_cart_base_mm_ram_device::device_start(); m_access_enabled = false; m_sn76489_enabled = false; io_space().install_write_tap(0x3c, 0x3c, "ena_access", [this] (offs_t, u8& data, u8){ this->m_access_enabled = BIT(data, 7); }); io_space().install_write_tap(0x3f, 0x3f, "sn76489w", [this] (offs_t, u8& data, u8){ if (m_sn76489_enabled) this->m_sn76489a->write(data); }); page(2)->install_write_tap(0x803c, 0x803c, "ena_sn76489", [this] (offs_t, u8& data, u8){ if (m_access_enabled) this->m_sn76489_enabled |= BIT(data, 6); }); page(2)->install_read_tap(0x80fc, 0x80fc, "map00r", [this] (offs_t, u8& data, u8){ if (m_access_enabled) data = 0xc0 | this->m_rambank[0]->entry(); }); page(2)->install_read_tap(0x80fd, 0x80fd, "map40r", [this] (offs_t, u8& data, u8){ if (m_access_enabled) data = 0xc0 | this->m_rambank[1]->entry(); }); page(2)->install_read_tap(0x80fe, 0x80fe, "map80r", [this] (offs_t, u8& data, u8){ if (m_access_enabled) data = 0xc0 | this->m_rambank[2]->entry(); }); page(2)->install_read_tap(0x80ff, 0x80ff, "mapc0r", [this] (offs_t, u8& data, u8){ if (m_access_enabled) data = 0xc0 | this->m_rambank[3]->entry(); }); page(2)->install_write_tap(0x80fc, 0x80fc, "map00w", [this] (offs_t, u8& data, u8){ if (m_access_enabled) this->bank_w<0>(data); }); page(2)->install_write_tap(0x80fd, 0x80fd, "map40w", [this] (offs_t, u8& data, u8){ if (m_access_enabled) this->bank_w<1>(data); }); page(2)->install_write_tap(0x80fe, 0x80fe, "map80w", [this] (offs_t, u8& data, u8){ if (m_access_enabled) this->bank_w<2>(data); }); page(2)->install_write_tap(0x80ff, 0x80ff, "mapc0w", [this] (offs_t, u8& data, u8){ if (m_access_enabled) this->bank_w<3>(data); }); save_item(NAME(m_access_enabled)); save_item(NAME(m_sn76489_enabled)); } void msx_cart_mmm_device::device_add_mconfig(machine_config &config) { SN76489A(config, m_sn76489a, DERIVED_CLOCK(1, 3)); if (parent_slot()) m_sn76489a->add_route(ALL_OUTPUTS, soundin(), 0.8); } class msx_cart_double_ram_device : public msx_cart_base_mm_ram_device { public: msx_cart_double_ram_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : msx_cart_base_mm_ram_device(mconfig, MSX_CART_DOUBLE_RAM, tag, owner, clock, 4 * 1024 * 1024) , m_mode_switch(*this, "MODE") , m_view{ {*this, "view0"}, {*this, "view1"}, {*this, "view2"}, {*this, "view3"} } , m_mrview{ {*this, "mrview0"}, {*this, "mrview1"}, {*this, "mrview2"}, {*this, "mrview3"} } , m_megaram(false) { } DECLARE_INPUT_CHANGED_MEMBER(mode_callback); protected: virtual void device_start() override ATTR_COLD; virtual void device_reset() override ATTR_COLD; virtual ioport_constructor device_input_ports() const override ATTR_COLD; private: static constexpr u8 MODE_RO = 0; static constexpr u8 MODE_RW = 1; static constexpr u8 MODE_MM = 0; static constexpr u8 MODE_MR = 1; required_ioport m_mode_switch; memory_view m_view[4]; memory_view m_mrview[4]; bool m_megaram; void set_page_views(); }; static INPUT_PORTS_START(double_ram_mode_switch) PORT_START("MODE") PORT_CONFNAME(0x01, 0x01, "Mode") PORT_CHANGED_MEMBER(DEVICE_SELF, FUNC(msx_cart_double_ram_device::mode_callback), 0) PORT_CONFSETTING(0x00, "Memory Mapper") PORT_CONFSETTING(0x01, "MegaRAM") INPUT_PORTS_END ioport_constructor msx_cart_double_ram_device::device_input_ports() const { return INPUT_PORTS_NAME(double_ram_mode_switch); } void msx_cart_double_ram_device::device_start() { msx_cart_base_ram_device::device_start(); m_bank_mask = device_generic_cart_interface::map_non_power_of_two( unsigned(get_ram_size() / 0x4000), [this] (unsigned entry, unsigned page) { for (int i = 0; i < 4; i++) m_rambank[i]->configure_entry(entry, ram_data() + 0x4000 * page); } ); page(0)->install_view(0x0000, 0x3fff, m_view[0]); page(1)->install_view(0x4000, 0x7fff, m_view[1]); page(2)->install_view(0x8000, 0xbfff, m_view[2]); page(3)->install_view(0xc000, 0xffff, m_view[3]); m_view[0][MODE_MM].install_readwrite_bank(0x0000, 0x3fff, m_rambank[0]); m_view[0][MODE_MR]; m_view[1][MODE_MM].install_readwrite_bank(0x4000, 0x7fff, m_rambank[1]); m_view[1][MODE_MR].install_view(0x4000, 0x5fff, m_mrview[0]); m_view[1][MODE_MR].install_view(0x6000, 0x7fff, m_mrview[1]); m_view[2][MODE_MM].install_readwrite_bank(0x8000, 0xbfff, m_rambank[2]); m_view[2][MODE_MR].install_view(0x8000, 0x9fff, m_mrview[2]); m_view[2][MODE_MR].install_view(0xa000, 0xbfff, m_mrview[3]); m_view[3][MODE_MM].install_readwrite_bank(0xc000, 0xffff, m_rambank[3]); m_view[3][MODE_MR]; m_mrview[0][MODE_RO].install_read_bank(0x4000, 0x5fff, m_rambank[0]); m_mrview[0][MODE_RO].install_write_handler(0x4000, 0x4000, write8smo_delegate(*this, [this] (u8 data) { this->m_rambank[0]->set_entry(data); }, "bank_4000")); m_mrview[0][MODE_RW].install_readwrite_bank(0x4000, 0x5fff, m_rambank[0]); m_mrview[1][MODE_RO].install_read_bank(0x6000, 0x7fff, m_rambank[1]); m_mrview[1][MODE_RO].install_write_handler(0x6000, 0x6000, write8smo_delegate(*this, [this] (u8 data) { this->m_rambank[1]->set_entry(data); }, "bank_6000")); m_mrview[1][MODE_RW].install_readwrite_bank(0x6000, 0x7fff, m_rambank[1]); m_mrview[2][MODE_RO].install_read_bank(0x8000, 0x9fff, m_rambank[2]); m_mrview[2][MODE_RO].install_write_handler(0x8000, 0x8000, write8smo_delegate(*this, [this] (u8 data) { this->m_rambank[2]->set_entry(data); }, "bank_8000")); m_mrview[2][MODE_RW].install_readwrite_bank(0x8000, 0x9fff, m_rambank[2]); m_mrview[3][MODE_RO].install_read_bank(0xa000, 0xbfff, m_rambank[3]); m_mrview[3][MODE_RO].install_write_handler(0xa000, 0xa000, write8smo_delegate(*this, [this] (u8 data) { this->m_rambank[3]->set_entry(data); }, "bank_a000")); m_mrview[3][MODE_RW].install_readwrite_bank(0xa000, 0xbfff, m_rambank[3]); io_space().install_read_tap(0x8e, 0x8e, "megaram_w", [this] (offs_t, u8&, u8) { if (m_megaram) for (int i = 0; i < 4; i++) m_mrview[i].select(MODE_RW); } ); io_space().install_write_tap(0x8e, 0x8e, "megaram_r", [this] (offs_t, u8&, u8) { if (m_megaram) for (int i = 0; i < 4; i++) m_mrview[i].select(MODE_RO); } ); // The MSX system allows multiple devices to react to I/O, so we use taps. io_space().install_write_tap(0xfc, 0xfc, "bank0", [this] (offs_t, u8& data, u8){ if (!m_megaram) this->bank_w<0>(data); }); io_space().install_write_tap(0xfd, 0xfd, "bank1", [this] (offs_t, u8& data, u8){ if (!m_megaram) this->bank_w<1>(data); }); io_space().install_write_tap(0xfe, 0xfe, "bank2", [this] (offs_t, u8& data, u8){ if (!m_megaram) this->bank_w<2>(data); }); io_space().install_write_tap(0xff, 0xff, "bank3", [this] (offs_t, u8& data, u8){ if (!m_megaram) this->bank_w<3>(data); }); save_item(NAME(m_megaram)); for (int i = 0; i < 4; i++) { m_mrview[i].select(MODE_RO); m_rambank[i]->set_entry(i); } } void msx_cart_double_ram_device::device_reset() { m_megaram = BIT(m_mode_switch->read(), 0); set_page_views(); } INPUT_CHANGED_MEMBER(msx_cart_double_ram_device::mode_callback) { m_megaram = BIT(newval, 0); set_page_views(); } void msx_cart_double_ram_device::set_page_views() { for (int i = 0; i < 4; i++) m_view[i].select(m_megaram ? MODE_MR : MODE_MM); } } // anonymous namespace DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_16K_RAM, msx_cart_interface, msx_cart_16k_ram_device, "msx_cart_16k_ram", "Generic MSX 16K RAM Expansion") DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_32K_RAM, msx_cart_interface, msx_cart_32k_ram_device, "msx_cart_32k_ram", "Generic MSX 32K RAM Expansion") DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_48K_RAM, msx_cart_interface, msx_cart_48k_ram_device, "msx_cart_48k_ram", "Generic MSX 48K RAM Expansion") DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_64K_RAM, msx_cart_interface, msx_cart_64k_ram_device, "msx_cart_64k_ram", "Generic MSX 64K RAM Expansion") DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_256K_MM_RAM, msx_cart_interface, msx_cart_256k_mm_ram_device, "msx_cart_256k_mm_ram", "Generic MSX 256K MM RAM Expansion") DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_512K_MM_RAM, msx_cart_interface, msx_cart_512k_mm_ram_device, "msx_cart_512k_mm_ram", "Generic MSX 512K MM RAM Expansion") DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_768K_MM_RAM, msx_cart_interface, msx_cart_768k_mm_ram_device, "msx_cart_768k_mm_ram", "Generic MSX 768K MM RAM Expansion") DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_1024K_MM_RAM, msx_cart_interface, msx_cart_1024k_mm_ram_device, "msx_cart_1024k_mm_ram", "Generic MSX 1024K MM RAM Expansion") DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_2048K_MM_RAM, msx_cart_interface, msx_cart_2048k_mm_ram_device, "msx_cart_2048k_mm_ram", "Generic MSX 2048K MM RAM Expansion") DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_4096K_MM_RAM, msx_cart_interface, msx_cart_4096k_mm_ram_device, "msx_cart_4096k_mm_ram", "Generic MSX 4096K MM RAM Expansion") DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_DOUBLE_RAM, msx_cart_interface, msx_cart_double_ram_device, "msx_cart_double_ram", "Tecnobytes Double RAM") DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_MMM, msx_cart_interface, msx_cart_mmm_device, "msx_cart_mmm", "Popolon Musical Memory Mapper")