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// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
#include "emu.h"
#include "arc.h"
const device_type MSX_CART_ARC = &device_creator<msx_cart_arc>;
msx_cart_arc::msx_cart_arc(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, MSX_CART_ARC, "MSX Cartridge - Arc", tag, owner, clock, "msx_cart_arc", __FILE__)
, msx_cart_interface(mconfig, *this)
, m_7f(0)
{
}
void msx_cart_arc::device_start()
{
// Install IO read/write handlers
address_space &space = machine().device<cpu_device>("maincpu")->space(AS_IO);
space.install_write_handler(0x7f, 0x7f, write8_delegate(FUNC(msx_cart_arc::io_7f_w), this));
space.install_read_handler(0x7f, 0x7f, read8_delegate(FUNC(msx_cart_arc::io_7f_r), this));
}
void msx_cart_arc::device_reset()
{
m_7f = 0;
}
void msx_cart_arc::initialize_cartridge()
{
if (get_rom_size() != 0x8000)
{
fatalerror("arc: Invalid ROM size\n");
}
}
READ8_MEMBER(msx_cart_arc::read_cart)
{
if (offset >= 0x4000 && offset < 0xc000)
{
return get_rom_base()[offset - 0x4000];
}
return 0xff;
}
WRITE8_MEMBER(msx_cart_arc::io_7f_w)
{
if (data == 0x35)
{
m_7f++;
}
}
READ8_MEMBER(msx_cart_arc::io_7f_r)
{
return ((m_7f & 0x03) == 0x03) ? 0xda : 0xff;
}
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