merge mapper code from FCEUX

[fceu.git] / mappers / 80.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 uint32 lastA;
static int isfu;
static uint8 CCache[8];

static void Fudou_PPU(uint32 A)
{
 static int last=-1;
 static uint8 z;
  
 if(A>=0x2000) return;

 A>>=10;
 lastA=A;

 z=CCache[A];
 if(z!=last)
 {
  onemir(z);
  last=z;
 }
}

static void mira()
{
 if(isfu)
 {
  int x;
  CCache[0]=CCache[1]=mapbyte2[0]>>7;
  CCache[2]=CCache[3]=mapbyte2[1]>>7;

  for(x=0;x<4;x++)
   CCache[4+x]=mapbyte2[2+x]>>7;

  onemir(CCache[lastA]);
 }
 else
  MIRROR_SET2(mapbyte1[0]&1);
}

static DECLFW(Mapper80_write)
{
 switch(A)
 {
  case 0x7ef0: mapbyte2[0]=V;VROM_BANK2(0x0000,(V>>1)&0x3F);mira();break;
  case 0x7ef1: mapbyte2[1]=V;VROM_BANK2(0x0800,(V>>1)&0x3f);mira();break;

  case 0x7ef2: mapbyte2[2]=V;VROM_BANK1(0x1000,V);mira();break;
  case 0x7ef3: mapbyte2[3]=V;VROM_BANK1(0x1400,V);mira();break;
  case 0x7ef4: mapbyte2[4]=V;VROM_BANK1(0x1800,V);mira();break;
  case 0x7ef5: mapbyte2[5]=V;VROM_BANK1(0x1c00,V);mira();break;
  case 0x7ef6: mapbyte1[0]=V;mira();break;
  case 0x7efa:
  case 0x7efb: ROM_BANK8(0x8000,V);break;
  case 0x7efd:
  case 0x7efc: ROM_BANK8(0xA000,V);break;
  case 0x7efe:
  case 0x7eff: ROM_BANK8(0xC000,V);break;
 }
}

static void booga(int version)
{
 mira();
}

void Mapper80_init(void)
{
 SetWriteHandler(0x4020,0x7eff,Mapper80_write);// 7f00-7fff battery backed ram inside mapper chip,\r
                                               // controlled by 7ef8 register, A8 - enable, FF - disable (?)\r
 MapStateRestore=booga;
 isfu=0;
}

void Mapper207_init(void)
{
 Mapper80_init();
 isfu=1;
 PPU_hook=Fudou_PPU;
}