// license:BSD-3-Clause // copyright-holders:Wilbert Pol /****************************************************************************** Banking for Love Plus Pack 0, Korean 83-in-1 pirate. ******************************************************************************/ #include "emu.h" #include "loveplus.h" namespace { class msx_cart_loveplus_device : public device_t, public msx_cart_interface { public: msx_cart_loveplus_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, MSX_CART_LOVEPLUS, tag, owner, clock) , msx_cart_interface(mconfig, *this) , m_rombank(*this, "rombank%u", 0U) { } virtual std::error_condition initialize_cartridge(std::string &message) override; protected: // device_t implementation virtual void device_start() override ATTR_COLD; virtual void device_reset() override ATTR_COLD; private: template void bank_w(u8 data); void bank_9000_w(u8 data); memory_bank_array_creator<4> m_rombank; u8 m_bank_mask; bool m_bank_locked[4]; }; void msx_cart_loveplus_device::device_start() { save_item(NAME(m_bank_locked)); } void msx_cart_loveplus_device::device_reset() { m_rombank[0]->set_entry(0); m_rombank[1]->set_entry(1); m_rombank[2]->set_entry(2); m_rombank[3]->set_entry(3); } std::error_condition msx_cart_loveplus_device::initialize_cartridge(std::string &message) { if (!cart_rom_region()) { message = "msx_cart_loveplus_device: Required region 'rom' was not found."; return image_error::INTERNAL; } const u32 size = cart_rom_region()->bytes(); const u16 banks = size / 0x2000; if (size > 256 * 0x8000 || size < 0x10000 || size != banks * 0x2000 || (~(banks - 1) % banks)) { message = "msx_cart_loveplus_device: Region 'rom' has unsupported size."; return image_error::INVALIDLENGTH; } m_bank_mask = banks - 1; m_rombank[0]->configure_entries(0, banks, cart_rom_region()->base(), 0x2000); m_rombank[1]->configure_entries(0, banks, cart_rom_region()->base(), 0x2000); m_rombank[2]->configure_entries(0, banks, cart_rom_region()->base(), 0x2000); m_rombank[3]->configure_entries(0, banks, cart_rom_region()->base(), 0x2000); page(1)->install_read_bank(0x4000, 0x5fff, m_rombank[0]); page(1)->install_read_bank(0x6000, 0x7fff, m_rombank[1]); page(1)->nop_write(0x5000, 0x5000); // Referenced from code but never used page(1)->install_write_handler(0x6000, 0x6000, emu::rw_delegate(*this, FUNC(msx_cart_loveplus_device::bank_w<0>))); page(1)->install_write_handler(0x6800, 0x6800, emu::rw_delegate(*this, FUNC(msx_cart_loveplus_device::bank_w<1>))); page(1)->install_write_handler(0x7000, 0x7000, emu::rw_delegate(*this, FUNC(msx_cart_loveplus_device::bank_w<2>))); page(1)->install_write_handler(0x7800, 0x7800, emu::rw_delegate(*this, FUNC(msx_cart_loveplus_device::bank_w<3>))); page(2)->install_read_bank(0x8000, 0x9fff, m_rombank[2]); page(2)->install_read_bank(0xa000, 0xbfff, m_rombank[3]); page(2)->install_write_handler(0x9000, 0x9000, emu::rw_delegate(*this, FUNC(msx_cart_loveplus_device::bank_9000_w))); page(2)->nop_write(0xb000, 0xb000); // Referenced from code but never used return std::error_condition(); } template void msx_cart_loveplus_device::bank_w(u8 data) { // The banking registers can be only written to once otherwise Q-Bert will not // start and drop back to Basic. if (!m_bank_locked[Bank]) { m_rombank[Bank]->set_entry(data & m_bank_mask); m_bank_locked[Bank] = true; } } void msx_cart_loveplus_device::bank_9000_w(u8 data) { // Before switching to a game the sequence 00, 3f, c2 is written here. // This unlocks and/or configures the write-once banking somehow for (int i = 0; i < 4; i++) m_bank_locked[i] = false; } } // anonymous namespace DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_LOVEPLUS, msx_cart_interface, msx_cart_loveplus_device, "msx_cart_loveplus", "MSX Cartridge - Love Plus Pack")