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/**********************************************************************
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<vic20_megacart_device>;
//-------------------------------------------------
// 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;
}
}
}
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