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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/***************************************************************************
Slogger Stop Press 64 cartridge emulation
***************************************************************************/
#include "emu.h"
#include "sp64.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(ELECTRON_SP64, electron_sp64_device, "electron_sp64", "Slogger Stop Press 64 cartridge")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// electron_sp64_device - constructor
//-------------------------------------------------
electron_sp64_device::electron_sp64_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, ELECTRON_SP64, tag, owner, clock)
, device_electron_cart_interface(mconfig, *this)
, m_page_register(0)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void electron_sp64_device::device_start()
{
save_item(NAME(m_page_register));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void electron_sp64_device::device_reset()
{
m_page_register = 0;
}
//-------------------------------------------------
// read - cartridge data read
//-------------------------------------------------
uint8_t electron_sp64_device::read(offs_t offset, int infc, int infd, int romqa, int oe, int oe2)
{
uint8_t data = 0xff;
if (infc)
{
switch (offset & 0xff)
{
case 0xfa:
data = m_page_register;
break;
}
}
else if (oe)
{
offs_t rom_page_offset = m_page_register << 14;
switch (romqa)
{
case 0:
data = m_rom[rom_page_offset | (offset & 0x3fff)];
break;
case 1:
data = m_ram[offset & 0x1fff];
break;
}
}
return data;
}
//-------------------------------------------------
// write - cartridge data write
//-------------------------------------------------
void electron_sp64_device::write(offs_t offset, uint8_t data, int infc, int infd, int romqa, int oe, int oe2)
{
if (infc)
{
switch (offset & 0xff)
{
case 0xfa:
m_page_register = data;
break;
}
}
else if (oe)
{
if (romqa == 1)
{
m_ram[offset & 0x1fff] = data;
}
}
}
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