fceugx/source/fceultra/boards/88.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 reg[8];
static uint8 mirror, cmd, is154;

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

static void Sync(void) {
	setchr2(0x0000, reg[0] >> 1);
	setchr2(0x0800, reg[1] >> 1);
	setchr1(0x1000, reg[2] | 0x40);
	setchr1(0x1400, reg[3] | 0x40);
	setchr1(0x1800, reg[4] | 0x40);
	setchr1(0x1C00, reg[5] | 0x40);
	setprg8(0x8000, reg[6]);
	setprg8(0xA000, reg[7]);
	setprg8(0xC000, ~1);
	setprg8(0xE000, ~0);
}

static void MSync(void) {
	if (is154) setmirror(MI_0 + (mirror & 1));
}

static DECLFW(M88Write) {
	switch (A & 0x8001) {
	case 0x8000: cmd = V & 7; mirror = V >> 6; MSync(); break;
	case 0x8001: reg[cmd] = V; Sync(); break;
	}
}

static void M88Power(void) {
	SetReadHandler(0x8000, 0xFFFF, CartBR);
	SetWriteHandler(0x8000, 0xFFFF, M88Write);
}

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

void Mapper88_Init(CartInfo *info) {
	is154 = 0;
	info->Power = M88Power;
	GameStateRestore = StateRestore;
	AddExState(&StateRegs, ~0, 0, 0);
}

void Mapper154_Init(CartInfo *info) {
	is154 = 1;
	info->Power = M88Power;
	GameStateRestore = StateRestore;
	AddExState(&StateRegs, ~0, 0, 0);
}