// license:BSD-3-Clause // copyright-holders:Wilbert Pol #include "emu.h" #include "crossblaim.h" DEFINE_DEVICE_TYPE(MSX_CART_CROSSBLAIM, msx_cart_crossblaim_device, "msx_cart_crossblaim", "MSX Cartridge Cross Blaim") msx_cart_crossblaim_device::msx_cart_crossblaim_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, MSX_CART_CROSSBLAIM, tag, owner, clock) , msx_cart_interface(mconfig, *this) , m_selected_bank(1) { for (auto & elem : m_bank_base) { elem = nullptr; } } void msx_cart_crossblaim_device::device_start() { save_item(NAME(m_selected_bank)); machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_crossblaim_device::restore_banks), this)); } void msx_cart_crossblaim_device::setup_bank() { m_bank_base[0] = ( m_selected_bank & 2 ) ? nullptr : get_rom_base() + ( m_selected_bank & 0x03 ) * 0x4000; m_bank_base[2] = get_rom_base() + ( m_selected_bank & 0x03 ) * 0x4000; m_bank_base[3] = ( m_selected_bank & 2 ) ? nullptr : get_rom_base() + ( m_selected_bank & 0x03 ) * 0x4000; } void msx_cart_crossblaim_device::restore_banks() { m_bank_base[1] = get_rom_base(); setup_bank(); } void msx_cart_crossblaim_device::device_reset() { m_selected_bank = 1; } void msx_cart_crossblaim_device::initialize_cartridge() { if (get_rom_size() != 0x10000) { fatalerror("crossblaim: Invalid ROM size\n"); } restore_banks(); } READ8_MEMBER(msx_cart_crossblaim_device::read_cart) { uint8_t *bank_base = m_bank_base[offset >> 14]; if (bank_base != nullptr) { return bank_base[offset & 0x3fff]; } return 0xff; } WRITE8_MEMBER(msx_cart_crossblaim_device::write_cart) { m_selected_bank = data & 3; if (m_selected_bank == 0) { m_selected_bank = 1; } setup_bank(); }