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// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
#include "emu.h"
#include "arc.h"
namespace {
class msx_cart_arc_device : public device_t, public msx_cart_interface
{
public:
msx_cart_arc_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: device_t(mconfig, MSX_CART_ARC, tag, owner, clock)
, msx_cart_interface(mconfig, *this)
, m_7f(0)
{ }
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:
void io_7f_w(u8 data);
u8 io_7f_r();
u8 m_7f;
};
void msx_cart_arc_device::device_start()
{
save_item(NAME(m_7f));
// Install IO read/write handlers
io_space().install_write_handler(0x7f, 0x7f, emu::rw_delegate(*this, FUNC(msx_cart_arc_device::io_7f_w)));
io_space().install_read_handler(0x7f, 0x7f, emu::rw_delegate(*this, FUNC(msx_cart_arc_device::io_7f_r)));
}
void msx_cart_arc_device::device_reset()
{
m_7f = 0;
}
std::error_condition msx_cart_arc_device::initialize_cartridge(std::string &message)
{
if (!cart_rom_region())
{
message = "msx_cart_arc_device: Required region 'rom' was not found.";
return image_error::INTERNAL;
}
if (cart_rom_region()->bytes() != 0x8000)
{
message = "msx_cart_arc_device: Region 'rom' has unsupported size.";
return image_error::INVALIDLENGTH;
}
page(1)->install_rom(0x4000, 0x7fff, cart_rom_region()->base());
page(2)->install_rom(0x8000, 0xbfff, cart_rom_region()->base() + 0x4000);
return std::error_condition();
}
void msx_cart_arc_device::io_7f_w(u8 data)
{
if (data == 0x35)
m_7f++;
}
u8 msx_cart_arc_device::io_7f_r()
{
return ((m_7f & 0x03) == 0x03) ? 0xda : 0xff;
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_ARC, msx_cart_interface, msx_cart_arc_device, "msx_cart_arc", "MSX Cartridge - Arc")
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