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// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
#include "emu.h"
#include "matra.h"
namespace {
class msx_cart_matra_comp_device : public device_t, public msx_cart_interface
{
public:
msx_cart_matra_comp_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, MSX_CART_MATRA_COMP, tag, owner, clock)
, msx_cart_interface(mconfig, *this)
, m_rombank(*this, "rombank%u", 0U)
, m_bank_mask(0)
, m_banking_enabled(true)
{ }
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:
template <int Bank> void bank_w(u8 data);
void disable_banking_w(u8 data);
memory_bank_array_creator<4> m_rombank;
u8 m_bank_mask;
bool m_banking_enabled;
};
void msx_cart_matra_comp_device::device_start()
{
save_item(NAME(m_banking_enabled));
}
void msx_cart_matra_comp_device::device_reset()
{
for (int i = 0; i < 4; i++)
m_rombank[i]->set_entry(i);
m_banking_enabled = true;
}
std::error_condition msx_cart_matra_comp_device::initialize_cartridge(std::string &message)
{
if (!cart_rom_region())
{
message = "msx_cart_matra_comp_device: Required region 'rom' was not found.";
return image_error::INTERNAL;
}
const u32 size = cart_rom_region()->bytes();
const u16 banks = size / 0x2000;
if (size > 256 * 0x2000 || size < 0x8000 || size != banks * 0x2000 || (~(banks - 1) % banks))
{
message = "msx_cart_matra_comp_device: Region 'rom' has unsupported size.";
return image_error::INVALIDLENGTH;
}
m_bank_mask = banks - 1;
for (int i = 0; i < 4; i++)
m_rombank[i]->configure_entries(0, banks, cart_rom_region()->base(), 0x2000);
page(1)->install_read_bank(0x4000, 0x5fff, m_rombank[0]);
page(1)->install_write_handler(0x5000, 0x5000, emu::rw_delegate(*this, FUNC(msx_cart_matra_comp_device::bank_w<0>)));
page(1)->install_read_bank(0x6000, 0x7fff, m_rombank[1]);
page(1)->install_write_handler(0x6000, 0x6000, emu::rw_delegate(*this, FUNC(msx_cart_matra_comp_device::bank_w<1>)));
page(2)->install_read_bank(0x8000, 0x9fff, m_rombank[2]);
page(2)->install_write_handler(0x8000, 0x8000, emu::rw_delegate(*this, FUNC(msx_cart_matra_comp_device::bank_w<2>)));
page(2)->install_read_bank(0xa000, 0xbfff, m_rombank[3]);
page(2)->install_write_handler(0xa000, 0xa000, emu::rw_delegate(*this, FUNC(msx_cart_matra_comp_device::bank_w<3>)));
page(2)->install_write_handler(0xba00, 0xba00, emu::rw_delegate(*this, FUNC(msx_cart_matra_comp_device::disable_banking_w)));
return std::error_condition();
}
template <int Bank>
void msx_cart_matra_comp_device::bank_w(u8 data)
{
if (m_banking_enabled)
m_rombank[Bank]->set_entry(data & m_bank_mask);
}
void msx_cart_matra_comp_device::disable_banking_w(u8 data)
{
// Assuming that any write here disables banking
m_banking_enabled = false;
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_MATRA_COMP, msx_cart_interface, msx_cart_matra_comp_device, "msx_cart_matra_comp", "MSX Cartridge - Matra Compilation")
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