fceugx/source/fceultra/boards/57.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 uint8 prg_reg;
static uint8 chr_reg;
static uint8 hrd_flag;

static SFORMAT StateRegs[] =
{
	{ &hrd_flag, 1, "DPSW" },
	{ &prg_reg, 1, "PRG" },
	{ &chr_reg, 1, "CHR" },
	{ 0 }
};

static void Sync(void) {
	if (prg_reg & 0x80)
		setprg32(0x8000, prg_reg >> 6);
	else{
		setprg16(0x8000, (prg_reg >> 5) & 3);
		setprg16(0xC000, (prg_reg >> 5) & 3);
	}
	setmirror((prg_reg & 8) >> 3);
	setchr8((chr_reg & 3) | (prg_reg & 7) | ((prg_reg & 0x10) >> 1));
}

static DECLFR(M57Read) {
	return hrd_flag;
}

static DECLFW(M57Write) {
	if ((A & 0x8800) == 0x8800)
		prg_reg = V;
	else
		chr_reg = V;
	Sync();
}

static void M57Power(void) {
	prg_reg = 0;
	chr_reg = 0;
	hrd_flag = 0;
	SetReadHandler(0x8000, 0xFFFF, CartBR);
	SetWriteHandler(0x8000, 0xFFFF, M57Write);
	SetReadHandler(0x6000, 0x6000, M57Read);
	Sync();
}

static void M57Reset() {
	hrd_flag++;
	hrd_flag &= 3;
	FCEU_printf("Select Register = %02x\n", hrd_flag);
}

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

void Mapper57_Init(CartInfo *info) {
	info->Power = M57Power;
	info->Reset = M57Reset;
	GameStateRestore = StateRestore;
	AddExState(&StateRegs, ~0, 0, 0);
}