// license:BSD-3-Clause // copyright-holders:Wilbert Pol #include "emu.h" #include "fs_sr022.h" namespace { class msx_cart_fs_sr022_device : public device_t, public msx_cart_interface { public: msx_cart_fs_sr022_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, MSX_CART_FS_SR022, tag, owner, clock) , msx_cart_interface(mconfig, *this) , m_bunsetsu_rom(nullptr) , m_bunsetsu_address(0) { } 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: u8 buns_r(); void buns_w(offs_t offset, u8 data); u8 *m_bunsetsu_rom; u32 m_bunsetsu_address; }; void msx_cart_fs_sr022_device::device_start() { save_item(NAME(m_bunsetsu_address)); } void msx_cart_fs_sr022_device::device_reset() { m_bunsetsu_address = 0; } std::error_condition msx_cart_fs_sr022_device::initialize_cartridge(std::string &message) { if (!cart_rom_region()) { message = "msx_cart_fs_sr022_device: Required region 'rom' was not found."; return image_error::INTERNAL; } if (cart_rom_region()->bytes() != 0x40000) { message = "msx_cart_fs_sr022_device: Region 'rom' has unsupported size."; return image_error::INVALIDLENGTH; } m_bunsetsu_rom = cart_rom_region()->base() + 0x20000; page(1)->install_rom(0x4000, 0x7fff, cart_rom_region()->base()); page(2)->install_rom(0x8000, 0xbfff, cart_rom_region()->base() + 0x4000); page(2)->install_read_handler(0xbfff, 0xbfff, emu::rw_delegate(*this, FUNC(msx_cart_fs_sr022_device::buns_r))); page(2)->install_write_handler(0xbffc, 0xbffe, emu::rw_delegate(*this, FUNC(msx_cart_fs_sr022_device::buns_w))); return std::error_condition(); } u8 msx_cart_fs_sr022_device::buns_r() { u8 data = m_bunsetsu_rom[m_bunsetsu_address & 0x1ffff]; if (!machine().side_effects_disabled()) m_bunsetsu_address++; return data; } void msx_cart_fs_sr022_device::buns_w(offs_t offset, uint8_t data) { switch (offset) { case 0: m_bunsetsu_address = (m_bunsetsu_address & 0xffff00) | data; break; case 1: m_bunsetsu_address = (m_bunsetsu_address & 0xff00ff) | (data << 8); break; case 2: m_bunsetsu_address = (m_bunsetsu_address & 0x00ffff) | (data << 16); break; } } } // anonymous namespace DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_FS_SR022, msx_cart_interface, msx_cart_fs_sr022_device, "msx_cart_fs_sr022", "MSX Cartridge - FS-SR022")