fceugx/source/fceultra/boards/170.cpp

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2011 CaH4e3
 *
 * 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"

static uint8 reg;

static SFORMAT StateRegs[] =
{
	{ &reg, 1, "REGS" },
	{ 0 }
};

static void Sync(void) {
	setprg16(0x8000, 0);
	setprg16(0xc000, ~0);
	setchr8(0);
}

static DECLFW(M170ProtW) {
	reg = V << 1 & 0x80;
}

static DECLFR(M170ProtR) {
	return reg | (X.DB & 0x7F);
}

static void M170Power(void) {
	Sync();
	SetWriteHandler(0x6502, 0x6502, M170ProtW);
	SetWriteHandler(0x7000, 0x7000, M170ProtW);
	SetReadHandler(0x7001, 0x7001, M170ProtR);
	SetReadHandler(0x7777, 0x7777, M170ProtR);
	SetReadHandler(0x8000, 0xFFFF, CartBR);
}

static void StateRestore(int version) {
	Sync();
}

void Mapper170_Init(CartInfo *info) {
	info->Power = M170Power;
	GameStateRestore = StateRestore;
	AddExState(&StateRegs, ~0, 0, 0);
}