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// license:BSD-3-Clause
// copyright-holders:Fabio Priuli
/***********************************************************************************************************
Sonic & Knuckles pass-thorugh cart emulation
TODO: currently we only support loading of base carts with no bankswitch or protection...
shall we support other as well?
***********************************************************************************************************/
#include "emu.h"
#include "sk.h"
#include "rom.h"
//-------------------------------------------------
// md_rom_device - constructor
//-------------------------------------------------
DEFINE_DEVICE_TYPE(MD_ROM_SK, md_rom_sk_device, "md_rom_sk", "MD Sonic & Knuckles")
md_rom_sk_device::md_rom_sk_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, type, tag, owner, clock)
, device_md_cart_interface(mconfig, *this)
, m_exp(*this, "subslot")
{
}
md_rom_sk_device::md_rom_sk_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: md_rom_sk_device(mconfig, MD_ROM_SK, tag, owner, clock)
{
}
void md_rom_sk_device::device_start()
{
}
/*-------------------------------------------------
mapper specific handlers
-------------------------------------------------*/
READ16_MEMBER(md_rom_sk_device::read)
{
if (m_exp->m_cart != nullptr && m_exp->m_cart->get_rom_base() != nullptr && offset >= 0x200000/2 && offset < (0x200000 + m_exp->m_cart->get_rom_size())/2)
return m_exp->m_cart->m_rom[offset - 0x200000/2];
if (offset < 0x400000/2)
return m_rom[MD_ADDR(offset)];
else
return 0xffff;
}
WRITE16_MEMBER(md_rom_sk_device::write)
{
// should there be anything here?
}
static void sk_sub_cart(device_slot_interface &device)
{
device.option_add_internal("rom", MD_STD_ROM);
device.option_add_internal("rom_svp", MD_STD_ROM);
device.option_add_internal("rom_sram", MD_ROM_SRAM);
device.option_add_internal("rom_sramsafe", MD_ROM_SRAM);
device.option_add_internal("rom_fram", MD_ROM_FRAM);
// add all types??
}
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
MACHINE_CONFIG_START(md_rom_sk_device::device_add_mconfig)
MCFG_MD_CARTRIDGE_ADD("subslot", sk_sub_cart, nullptr)
MCFG_MD_CARTRIDGE_NOT_MANDATORY
MACHINE_CONFIG_END
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