fceugx/source/fceultra/boards/235.cpp

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2005 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 uint16 cmdreg;
static SFORMAT StateRegs[] =
{
	{ &cmdreg, 2, "CREG" },
	{ 0 }
};

static void Sync(void) {
	if (cmdreg & 0x400)
		setmirror(MI_0);
	else
		setmirror(((cmdreg >> 13) & 1) ^ 1);
	if (cmdreg & 0x800) {
		setprg16(0x8000, ((cmdreg & 0x300) >> 3) | ((cmdreg & 0x1F) << 1) | ((cmdreg >> 12) & 1));
		setprg16(0xC000, ((cmdreg & 0x300) >> 3) | ((cmdreg & 0x1F) << 1) | ((cmdreg >> 12) & 1));
	} else
		setprg32(0x8000, ((cmdreg & 0x300) >> 4) | (cmdreg & 0x1F));
}

static DECLFW(M235Write) {
	cmdreg = A;
	Sync();
}

static void M235Power(void) {
	setchr8(0);
	SetWriteHandler(0x8000, 0xFFFF, M235Write);
	SetReadHandler(0x8000, 0xFFFF, CartBR);
	cmdreg = 0;
	Sync();
}

static void M235Restore(int version) {
	Sync();
}

void Mapper235_Init(CartInfo *info) {
	info->Power = M235Power;
	GameStateRestore = M235Restore;
	AddExState(&StateRegs, ~0, 0, 0);
}