merge mapper code from FCEUX

[fceu.git] / mappers / 76.c

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel
 *
 * 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 MMC3_cmd;

static DECLFW(Mapper76_write)
{
        switch(A&0xE001){
        case 0x8000:
         MMC3_cmd = V;
         break;
        case 0x8001:
                switch(MMC3_cmd&0x07){
                case 2: VROM_BANK2(0x000,V);break;
                case 3: VROM_BANK2(0x800,V);break;
                case 4: VROM_BANK2(0x1000,V);break;
                case 5: VROM_BANK2(0x1800,V);break;
                case 6:
                        if(MMC3_cmd&0x40) ROM_BANK8(0xC000,V);
                        else ROM_BANK8(0x8000,V);
                        break;
                case 7: ROM_BANK8(0xA000,V);
                        break;
               }
               break;
        case 0xA000:
        MIRROR_SET(V&1);
        break;
 }
}

void Mapper76_init(void)
{
SetWriteHandler(0x8000,0xffff,Mapper76_write);
}