// license:BSD-3-Clause // copyright-holders:Wilbert Pol #include "emu.h" #include "crossblaim.h" const device_type MSX_CART_CROSSBLAIM = &device_creator; msx_cart_crossblaim::msx_cart_crossblaim(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, MSX_CART_CROSSBLAIM, "MSX Cartridge - Cross Blaim", tag, owner, clock, "msx_cart_crossblaim", __FILE__) , msx_cart_interface(mconfig, *this) , m_selected_bank(1) { for (int i = 0; i < 4; i++) { m_bank_base[i] = NULL; } } void msx_cart_crossblaim::device_start() { save_item(NAME(m_selected_bank)); machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_crossblaim::restore_banks), this)); } void msx_cart_crossblaim::setup_bank() { m_bank_base[0] = ( m_selected_bank & 2 ) ? NULL : 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 ) ? NULL : get_rom_base() + ( m_selected_bank & 0x03 ) * 0x4000; } void msx_cart_crossblaim::restore_banks() { m_bank_base[1] = get_rom_base(); setup_bank(); } void msx_cart_crossblaim::device_reset() { m_selected_bank = 1; } void msx_cart_crossblaim::initialize_cartridge() { if (get_rom_size() != 0x10000) { fatalerror("crossblaim: Invalid ROM size\n"); } restore_banks(); } READ8_MEMBER(msx_cart_crossblaim::read_cart) { UINT8 *bank_base = m_bank_base[offset >> 14]; if (bank_base != NULL) { return bank_base[offset & 0x3fff]; } return 0xff; } WRITE8_MEMBER(msx_cart_crossblaim::write_cart) { m_selected_bank = data & 3; if (m_selected_bank == 0) { m_selected_bank = 1; } setup_bank(); }