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path: root/src/devices/bus/msx_cart/super_swangi.cpp
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// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
#include "emu.h"
#include "super_swangi.h"


DEFINE_DEVICE_TYPE(MSX_CART_SUPER_SWANGI, msx_cart_super_swangi_device, "msx_cart_super_swangi", "MSX Cartridge - Super Swangi")


msx_cart_super_swangi_device::msx_cart_super_swangi_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: device_t(mconfig, MSX_CART_SUPER_SWANGI, tag, owner, clock)
	, msx_cart_interface(mconfig, *this)
	, m_selected_bank(0)
{
	m_bank_base[0] = m_bank_base[1] = nullptr;
}


void msx_cart_super_swangi_device::device_start()
{
	save_item(NAME(m_selected_bank));
}


void msx_cart_super_swangi_device::device_post_load()
{
	restore_banks();
}


void msx_cart_super_swangi_device::restore_banks()
{
	m_bank_base[0] = get_rom_base();
	m_bank_base[1] = get_rom_base() + (((m_selected_bank >> 1) * 0x4000) & 0xffff);
}


void msx_cart_super_swangi_device::device_reset()
{
	m_selected_bank = 0;
}


void msx_cart_super_swangi_device::initialize_cartridge()
{
	if (get_rom_size() < 0x10000)
	{
		fatalerror("rtype: Invalid ROM size\n");
	}

	restore_banks();
}


uint8_t msx_cart_super_swangi_device::read_cart(offs_t offset)
{
	if (offset >= 0x4000 && offset < 0xc000)
	{
		return m_bank_base[offset >> 15][offset & 0x3fff];
	}
	return 0xff;
}


void msx_cart_super_swangi_device::write_cart(offs_t offset, uint8_t data)
{
	if (offset == 0x8000)
	{
		m_selected_bank = data;
		restore_banks();
	}
	else
	{
		logerror("msx_cart_super_swangi_device: unhandled write %02x to %04x\n", data, offset);
	}
}