/* FCEUmm - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2020
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 *
 */

#include "mapinc.h"
#include "asic_vrc2and4.h"

static uint8 reg;

static void sync() {
	int prgAND = 0x0F;
	int chrAND = reg &0x03? 0x0FF: 0x1FF;
	int prgOR  = reg <<4;
	int chrOR  = !!(reg &0x03)*0x200 | !!(reg &0x02)*0x100;
	VRC24_syncPRG(prgAND, prgOR &~prgAND);
	VRC24_syncCHR(chrAND, chrOR &~chrAND);
	VRC24_syncMirror();
}

static DECLFW(writeReg) {
	reg = A &0xFF;
	sync();
}

static void reset() {
	reg = 0;
	sync();
}

static void power() {
	reg = 0;
	VRC24_power();
	SetWriteHandler(0x5000, 0x5FFF, writeReg);
}

void Mapper570_Init(CartInfo *info) {
	VRC4_init(info, sync, 1, 2, 1, NULL, NULL, NULL, NULL, NULL);
	info->Power = power;
	info->Reset = reset;
	AddExState(&reg, 1, 0, "EXPR");
}