mappers/68.c

   1 /* FCE Ultra - NES/Famicom Emulator
   2  *
   3  * Copyright notice for this file:
   4  *  Copyright (C) 2002 Xodnizel
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "mapinc.h"
  22
  23 static void Fixerit(void)
  24 {
  25  switch(mapbyte2[0]&3)
  26  {
  27   case 0:vnapage[0]=vnapage[2]=CHRptr[0]+(((mapbyte1[0]|128)&CHRmask1[0])<<10);
  28          vnapage[1]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]|128)&CHRmask1[0])<<10);
  29          break;
  30   case 1:vnapage[0]=vnapage[1]=CHRptr[0]+(((mapbyte1[0]|128)&CHRmask1[0])<<10);
  31          vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]|128)&CHRmask1[0])<<10);
  32          break;
  33   case 2:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[0]|128)&CHRmask1[0])<<10);
  34          break;
  35   case 3:vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((mapbyte1[1]|128)&CHRmask1[0])<<10);
  36          break;
  37  }
  38 }
  39
  40 DECLFW(Mapper68_write)
  41 {
  42 // FCEU_printf("%04x,%04x\n",A,V);
  43  A&=0xF000;
  44
  45  if(A>=0x8000 && A<=0xB000)
  46  {
  47   VROM_BANK2((A-0x8000)>>1,V);
  48  }
  49  else switch(A)
  50  {
  51   case 0xc000:mapbyte1[0]=V;
  52               if(VROM_size && mapbyte2[0]&0x10)
  53                Fixerit();
  54               break;
  55
  56   case 0xd000:mapbyte1[1]=V;
  57               if(VROM_size && mapbyte2[0]&0x10)
  58                Fixerit();
  59               break;
  60
  61   case 0xe000: mapbyte2[0]=V;
  62                if(!(V&0x10))
  63                {
  64                 switch(V&3)
  65                 {
  66                  case 0:MIRROR_SET2(1);break;
  67                  case 1:MIRROR_SET2(0);break;
  68                  case 2:onemir(0);break;
  69                  case 3:onemir(1);break;
  70                 }
  71                }
  72                else if(VROM_size)
  73                {
  74                 Fixerit();
  75                 PPUNTARAM=0;
  76                }
  77                break;
  78   case 0xf000: ROM_BANK16(0x8000,V);break;
  79  }
  80 }
  81
  82 static void Mapper68_StateRestore(int version)
  83 {
  84               if(!(mapbyte2[0]&0x10))
  85               {
  86                switch(mapbyte2[0]&3)
  87                {
  88                 case 0:MIRROR_SET(0);break;
  89                 case 1:MIRROR_SET(1);break;
  90                 case 2:onemir(0);break;
  91                 case 3:onemir(1);break;
  92                }
  93               }
  94               else if(VROM_size)
  95               {
  96                 Fixerit();
  97                 PPUNTARAM=0;
  98               }
  99 }
 100
 101 void Mapper68_init(void)
 102 {
 103  SetWriteHandler(0x8000,0xffff,Mapper68_write);
 104  MapStateRestore=Mapper68_StateRestore;
 105 }