// license:BSD-3-Clause // copyright-holders:Wilbert Pol #include "emu.h" #include "halnote.h" DEFINE_DEVICE_TYPE(MSX_CART_HALNOTE, msx_cart_halnote_device, "msx_cart_halnote", "MSX Cartridge - Halnote") msx_cart_halnote_device::msx_cart_halnote_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, MSX_CART_HALNOTE, tag, owner, clock) , msx_cart_interface(mconfig, *this) , m_selected_bank{ 0, 0, 0, 0, 0, 0, 0, 0 } , m_bank_base{ nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr } { } void msx_cart_halnote_device::device_start() { save_item(NAME(m_selected_bank)); } void msx_cart_halnote_device::device_post_load() { restore_banks(); } void msx_cart_halnote_device::map_bank(int bank) { if (bank < 2) { return; } // Special banks if (bank == 6 || bank == 7) { m_bank_base[bank] = get_rom_base() + 0x80000 + (m_selected_bank[bank] * 0x800); return; } m_bank_base[bank] = get_rom_base() + ((m_selected_bank[bank] * 0x2000) & 0xFFFFF); if (bank == 2) { if (m_selected_bank[bank] & 0x80) { m_bank_base[0] = get_sram_base(); m_bank_base[1] = get_sram_base() + 0x2000; } else { m_bank_base[0] = nullptr; m_bank_base[1] = nullptr; } } } void msx_cart_halnote_device::restore_banks() { for (int i = 0; i < 8; i++) { map_bank(i); } } void msx_cart_halnote_device::device_reset() { for (auto & elem : m_selected_bank) { elem = 0; } } void msx_cart_halnote_device::initialize_cartridge() { if (get_rom_size() != 0x100000) { fatalerror("halnote: Invalid ROM size\n"); } restore_banks(); } uint8_t msx_cart_halnote_device::read_cart(offs_t offset) { if (offset >= 0xc000) { return 0xFF; } if ((offset & 0xf000) == 0x7000 && (m_selected_bank[3] & 0x80)) { return m_bank_base[6 + ((offset >> 11) & 0x01)][offset & 0x7ff]; } const uint8_t *mem = m_bank_base[offset >> 13]; if (mem) { return mem[offset & 0x1fff]; } return 0xff; } void msx_cart_halnote_device::write_cart(offs_t offset, uint8_t data) { if (offset < 0x4000) { if (m_bank_base[0] != nullptr) { m_sram[offset & 0x3fff] = data; return; } } switch (offset) { case 0x4FFF: m_selected_bank[2] = data; map_bank(2); break; case 0x6FFF: // 6000-7FFF m_selected_bank[3] = data; map_bank(3); break; case 0x77FF: m_selected_bank[6] = data; map_bank(6); break; case 0x7FFF: m_selected_bank[7] = data; map_bank(7); break; case 0x8FFF: m_selected_bank[4] = data; map_bank(4); break; case 0xAFFF: m_selected_bank[5] = data; map_bank(5); break; default: logerror("msx_cart_halnote_device: Unhandled write %02x to %04x\n", data, offset); break; } }