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// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
#include "emu.h"
#include "fs_sr022.h"
namespace {
class msx_cart_fs_sr022_device : public device_t, public msx_cart_interface
{
public:
msx_cart_fs_sr022_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, MSX_CART_FS_SR022, tag, owner, clock)
, msx_cart_interface(mconfig, *this)
, m_bunsetsu_rom(nullptr)
, m_bunsetsu_address(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:
u8 buns_r();
void buns_w(offs_t offset, u8 data);
u8 *m_bunsetsu_rom;
u32 m_bunsetsu_address;
};
void msx_cart_fs_sr022_device::device_start()
{
save_item(NAME(m_bunsetsu_address));
}
void msx_cart_fs_sr022_device::device_reset()
{
m_bunsetsu_address = 0;
}
std::error_condition msx_cart_fs_sr022_device::initialize_cartridge(std::string &message)
{
if (!cart_rom_region())
{
message = "msx_cart_fs_sr022_device: Required region 'rom' was not found.";
return image_error::INTERNAL;
}
if (cart_rom_region()->bytes() != 0x40000)
{
message = "msx_cart_fs_sr022_device: Region 'rom' has unsupported size.";
return image_error::INVALIDLENGTH;
}
m_bunsetsu_rom = cart_rom_region()->base() + 0x20000;
page(1)->install_rom(0x4000, 0x7fff, cart_rom_region()->base());
page(2)->install_rom(0x8000, 0xbfff, cart_rom_region()->base() + 0x4000);
page(2)->install_read_handler(0xbfff, 0xbfff, emu::rw_delegate(*this, FUNC(msx_cart_fs_sr022_device::buns_r)));
page(2)->install_write_handler(0xbffc, 0xbffe, emu::rw_delegate(*this, FUNC(msx_cart_fs_sr022_device::buns_w)));
return std::error_condition();
}
u8 msx_cart_fs_sr022_device::buns_r()
{
u8 data = m_bunsetsu_rom[m_bunsetsu_address & 0x1ffff];
if (!machine().side_effects_disabled())
m_bunsetsu_address++;
return data;
}
void msx_cart_fs_sr022_device::buns_w(offs_t offset, uint8_t data)
{
switch (offset)
{
case 0:
m_bunsetsu_address = (m_bunsetsu_address & 0xffff00) | data;
break;
case 1:
m_bunsetsu_address = (m_bunsetsu_address & 0xff00ff) | (data << 8);
break;
case 2:
m_bunsetsu_address = (m_bunsetsu_address & 0x00ffff) | (data << 16);
break;
}
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(MSX_CART_FS_SR022, msx_cart_interface, msx_cart_fs_sr022_device, "msx_cart_fs_sr022", "MSX Cartridge - FS-SR022")
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