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// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
/**********************************************************************
ColecoVision X-in-1 cartridge emulation
**********************************************************************/
#include "xin1.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
const device_type COLECOVISION_XIN1 = &device_creator<colecovision_xin1_cartridge_device>;
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// colecovision_xin1_cartridge_device - constructor
//-------------------------------------------------
colecovision_xin1_cartridge_device::colecovision_xin1_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
device_t(mconfig, COLECOVISION_XIN1, "ColecoVision X-in-1 cartridge", tag, owner, clock, "colecovision_xin1", __FILE__),
device_colecovision_cartridge_interface(mconfig, *this),
m_current_offset(0)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void colecovision_xin1_cartridge_device::device_start()
{
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void colecovision_xin1_cartridge_device::device_reset()
{
m_current_offset = m_rom_size - 0x8000;
}
//-------------------------------------------------
// read - cartridge data read
//-------------------------------------------------
UINT8 colecovision_xin1_cartridge_device::bd_r(address_space &space, offs_t offset, UINT8 data, int _8000, int _a000, int _c000, int _e000)
{
if (!_8000 || !_a000 || !_c000 || !_e000)
{
data = m_rom[m_current_offset + offset];
if (!_e000 && offset >= 0x7fc0) {
m_current_offset = (0x8000 * (offset - 0x7fc0)) % m_rom_size;
}
}
return data;
}
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