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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
MultiMAX 1MB ROM / 2KB RAM cartridge emulation
**********************************************************************/
#include "emu.h"
#include "multimax.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(VIC10_MULTIMAX, vic10_multimax_device, "vic10_multimax", "VIC-10 MultiMAX Cartridge")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// vic10_multimax_device - constructor
//-------------------------------------------------
vic10_multimax_device::vic10_multimax_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) :
device_t(mconfig, VIC10_MULTIMAX, tag, owner, clock), device_vic10_expansion_card_interface(mconfig, *this),
m_latch(0)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void vic10_multimax_device::device_start()
{
// state saving
save_item(NAME(m_latch));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void vic10_multimax_device::device_reset()
{
m_latch = 0;
}
//-------------------------------------------------
// vic10_cd_r - cartridge data read
//-------------------------------------------------
uint8_t vic10_multimax_device::vic10_cd_r(offs_t offset, uint8_t data, int lorom, int uprom, int exram)
{
if (!lorom)
{
data = m_lorom[((m_latch & 0x3f) << 14) | (offset & 0x1fff)];
}
else if (!uprom)
{
data = m_lorom[((m_latch & 0x3f) << 14) | 0x2000 | (offset & 0x1fff)];
}
else if (!exram)
{
if (m_latch)
{
data = m_exram[offset & 0x7ff];
}
}
return data;
}
//-------------------------------------------------
// vic10_cd_w - cartridge data write
//-------------------------------------------------
void vic10_multimax_device::vic10_cd_w(offs_t offset, uint8_t data, int lorom, int uprom, int exram)
{
if (!exram)
{
if (m_latch)
{
m_exram[offset & 0x7ff] = data;
}
else
{
m_latch = data;
}
}
}
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