fceugx/source/fceultra/boards/bs-5.cpp

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2007 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_prg[4];
static uint8 reg_chr[4];
static uint8 dip_switch;

static SFORMAT StateRegs[] =
{
	{ reg_prg, 4, "PREG" },
	{ reg_chr, 4, "CREG" },
	{ 0 }
};

static void Sync(void) {
	setprg8(0x8000, reg_prg[0]);
	setprg8(0xa000, reg_prg[1]);
	setprg8(0xc000, reg_prg[2]);
	setprg8(0xe000, reg_prg[3]);
	setchr2(0x0000, reg_chr[0]);
	setchr2(0x0800, reg_chr[1]);
	setchr2(0x1000, reg_chr[2]);
	setchr2(0x1800, reg_chr[3]);
	setmirror(MI_V);
}

static DECLFW(MBS5Write) {
	int bank_sel = (A & 0xC00) >> 10;
	switch (A & 0xF000) {
	case 0x8000:
		reg_chr[bank_sel] = A & 0x1F;
		break;
	case 0xA000:
		if (A & (1 << (dip_switch + 4)))
			reg_prg[bank_sel] = A & 0x0F;
		break;
	}
	Sync();
}

static void MBS5Reset(void) {
	dip_switch++;
	dip_switch &= 3;
	reg_prg[0] = reg_prg[1] = reg_prg[2] = reg_prg[3] = ~0;
	Sync();
}

static void MBS5Power(void) {
	dip_switch = 0;
	reg_prg[0] = reg_prg[1] = reg_prg[2] = reg_prg[3] = ~0;
	Sync();
	SetReadHandler(0x8000, 0xFFFF, CartBR);
	SetWriteHandler(0x8000, 0xFFFF, MBS5Write);
}

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

void BMCBS5_Init(CartInfo *info) {
	info->Power = MBS5Power;
	info->Reset = MBS5Reset;
	GameStateRestore = StateRestore;
	AddExState(&StateRegs, ~0, 0, 0);
}