fceugx/source/fceultra/boards/12in1.cpp

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2009 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
 *
 * 7-in-1 Darkwing Duck, Snake, MagicBlock (PCB marked as "12 in 1")
 */

#include "mapinc.h"

static uint8 reg[4];
static SFORMAT StateRegs[] =
{
	{ reg, 4, "REGS" },
	{ 0 }
};

static void Sync(void) {
	uint8 bank = (reg[3] & 3) << 3;
	setchr4(0x0000, (reg[1] >> 3) | (bank << 2));
	setchr4(0x1000, (reg[2] >> 3) | (bank << 2));
	if (reg[3] & 8) {
		setprg32(0x8000, ((reg[2] & 7) >> 1) | bank);
	} else {
		setprg16(0x8000, (reg[1] & 7) | bank);
		setprg16(0xc000, 7 | bank);
	}
	setmirror(((reg[3] & 4) >> 2) ^ 1);
}

static DECLFW(BMC12IN1Write) {
	switch (A) {
	case 0xafff: reg[0] = V; break;
	case 0xbfff: reg[1] = V; break;
	case 0xdfff: reg[2] = V; break;
	case 0xefff: reg[3] = V; break;
	}
	Sync();
}

static void BMC12IN1Power(void) {
	reg[0] = reg[1] = reg[2] = reg[3] = 0;
	Sync();
	SetReadHandler(0x8000, 0xFFFF, CartBR);
	SetWriteHandler(0x8000, 0xFFFF, BMC12IN1Write);
}

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

void BMC12IN1_Init(CartInfo *info) {
	info->Power = BMC12IN1Power;
	GameStateRestore = StateRestore;
	AddExState(&StateRegs, ~0, 0, 0);
}