fceugx/source/fceultra/boards/112.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
 *
 * NTDEC, ASDER games
 *
 */

#include "mapinc.h"

static uint8 reg[8];
static uint8 mirror, cmd, bank;
static uint8 *WRAM = NULL;

static SFORMAT StateRegs[] =
{
	{ &cmd, 1, "CMD" },
	{ &mirror, 1, "MIRR" },
	{ &bank, 1, "BANK" },
	{ reg, 8, "REGS" },
	{ 0 }
};

static void Sync(void) {
	setmirror(mirror ^ 1);
	setprg8(0x8000, reg[0]);
	setprg8(0xA000, reg[1]);
	setchr2(0x0000, (reg[2] >> 1));
	setchr2(0x0800, (reg[3] >> 1));
	setchr1(0x1000, ((bank & 0x10) << 4) | reg[4]);
	setchr1(0x1400, ((bank & 0x20) << 3) | reg[5]);
	setchr1(0x1800, ((bank & 0x40) << 2) | reg[6]);
	setchr1(0x1C00, ((bank & 0x80) << 1) | reg[7]);
}

static DECLFW(M112Write) {
	switch (A) {
	case 0xe000: mirror = V & 1; Sync();; break;
	case 0x8000: cmd = V & 7; break;
	case 0xa000: reg[cmd] = V; Sync(); break;
	case 0xc000: bank = V; Sync(); break;
	}
}

static void M112Close(void) {
	if (WRAM)
		FCEU_gfree(WRAM);
	WRAM = NULL;
}

static void M112Power(void) {
	bank = 0;
	setprg16(0xC000, ~0);
	setprg8r(0x10, 0x6000, 0);
	SetReadHandler(0x8000, 0xFFFF, CartBR);
	SetWriteHandler(0x8000, 0xFFFF, M112Write);
	SetWriteHandler(0x4020, 0x5FFF, M112Write);
	SetReadHandler(0x6000, 0x7FFF, CartBR);
	SetWriteHandler(0x6000, 0x7FFF, CartBW);
	FCEU_CheatAddRAM(8, 0x6000, WRAM);
}

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

void Mapper112_Init(CartInfo *info) {
	info->Power = M112Power;
	info->Close = M112Close;
	GameStateRestore = StateRestore;
	WRAM = (uint8*)FCEU_gmalloc(8192);
	SetupCartPRGMapping(0x10, WRAM, 8192, 1);
	AddExState(WRAM, 8192, 0, "WRAM");
	AddExState(&StateRegs, ~0, 0, 0);
}