/********************************************************************** Mega-Cart cartridge emulation Copyright MESS Team. Visit http://mamedev.org for licensing and usage restrictions. **********************************************************************/ #include "vic20_megacart.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** const device_type VIC20_MEGACART = &device_creator; //------------------------------------------------- // MACHINE_DRIVER( vic1112 ) //------------------------------------------------- static MACHINE_CONFIG_FRAGMENT( vic1112 ) MACHINE_CONFIG_END //------------------------------------------------- // machine_config_additions - device-specific // machine configurations //------------------------------------------------- machine_config_constructor vic20_megacart_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME( vic1112 ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // vic20_megacart_device - constructor //------------------------------------------------- vic20_megacart_device::vic20_megacart_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, VIC20_MEGACART, "Mega-Cart", tag, owner, clock, "megacart", __FILE__), device_vic20_expansion_card_interface(mconfig, *this), device_nvram_interface(mconfig, *this), m_nvram_en(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void vic20_megacart_device::device_start() { // state saving save_item(NAME(m_nvram_en)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void vic20_megacart_device::device_reset() { } //------------------------------------------------- // vic20_cd_r - cartridge data read //------------------------------------------------- UINT8 vic20_megacart_device::vic20_cd_r(address_space &space, offs_t offset, UINT8 data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3) { if (!ram1 || !ram2 || !ram3 || !io2 || !io3) { if (m_nvram_en) { data = m_nvram[offset & 0x1fff]; } } else if (!blk1 || !blk2 || !blk3) { } else if (!blk5) { } return data; } //------------------------------------------------- // vic20_cd_w - cartridge data write //------------------------------------------------- void vic20_megacart_device::vic20_cd_w(address_space &space, offs_t offset, UINT8 data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3) { if (!ram1 || !ram2 || !ram3 || !io2) { if (m_nvram_en) { m_nvram[offset & 0x1fff] = data; } } else if (!blk1 || !blk2 || !blk3) { } else if (!blk5) { } else if (!io3) { if (m_nvram_en) { m_nvram[offset & 0x1fff] = data; } } }