fceugx/source/fceultra/boards/bmc70in1.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 is_large_banks, hw_switch;
static uint8 large_bank;
static uint8 prg_bank;
static uint8 chr_bank;
static uint8 bank_mode;
static uint8 mirroring;
static SFORMAT StateRegs[] =
{
	{ &large_bank, 1, "LB" },
	{ &hw_switch, 1, "DPSW" },
	{ &prg_bank, 1, "PRG" },
	{ &chr_bank, 1, "CHR" },
	{ &bank_mode, 1, "BM" },
	{ &mirroring, 1, "MIRR" },
	{ 0 }
};

static void Sync(void) {
	switch (bank_mode) {
	case 0x00:
	case 0x10:
		setprg16(0x8000, large_bank | prg_bank);
		setprg16(0xC000, large_bank | 7);
		break;
	case 0x20:
		setprg32(0x8000, (large_bank | prg_bank) >> 1);
		break;
	case 0x30:
		setprg16(0x8000, large_bank | prg_bank);
		setprg16(0xC000, large_bank | prg_bank);
		break;
	}
	setmirror(mirroring);
	if (!is_large_banks)
		setchr8(chr_bank);
}

static DECLFR(BMC70in1Read) {
	if (bank_mode == 0x10)
//	if(is_large_banks)
		return CartBR((A & 0xFFF0) | hw_switch);
//	else
//		return CartBR((A&0xFFF0)|hw_switch);
	else
		return CartBR(A);
}

static DECLFW(BMC70in1Write) {
	if (A & 0x4000) {
		bank_mode = A & 0x30;
		prg_bank = A & 7;
	} else {
		mirroring = ((A & 0x20) >> 5) ^ 1;
		if (is_large_banks)
			large_bank = (A & 3) << 3;
		else
			chr_bank = A & 7;
	}
	Sync();
}

static void BMC70in1Reset(void) {
	bank_mode = 0;
	large_bank = 0;
	Sync();
	hw_switch++;
	hw_switch &= 0xf;
}

static void BMC70in1Power(void) {
	setchr8(0);
	bank_mode = 0;
	large_bank = 0;
	Sync();
	SetReadHandler(0x8000, 0xFFFF, BMC70in1Read);
	SetWriteHandler(0x8000, 0xffff, BMC70in1Write);
}

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

void BMC70in1_Init(CartInfo *info) {
	is_large_banks = 0;
	hw_switch = 0xd;
	info->Power = BMC70in1Power;
	info->Reset = BMC70in1Reset;
	GameStateRestore = StateRestore;
	AddExState(&StateRegs, ~0, 0, 0);
}

void BMC70in1B_Init(CartInfo *info) {
	is_large_banks = 1;
	hw_switch = 0x6;
	info->Power = BMC70in1Power;
	info->Reset = BMC70in1Reset;
	GameStateRestore = StateRestore;
	AddExState(&StateRegs, ~0, 0, 0);
}