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  A&=0xF000;
  43
  44  if(A>=0x8000 && A<=0xB000)
  45  {
  46   VROM_BANK2((A-0x8000)>>1,V);
  47  }
  48  else switch(A)
  49  {
  50   case 0xc000:mapbyte1[0]=V;
  51               if(VROM_size && mapbyte2[0]&0x10)
  52                Fixerit();
  53               break;
  54
  55   case 0xd000:mapbyte1[1]=V;
  56               if(VROM_size && mapbyte2[0]&0x10)
  57                Fixerit();
  58               break;
  59
  60   case 0xe000: mapbyte2[0]=V;
  61                if(!(V&0x10))
  62                {
  63                 switch(V&3)
  64                 {
  65                  case 0:MIRROR_SET2(1);break;
  66                  case 1:MIRROR_SET2(0);break;
  67                  case 2:onemir(0);break;
  68                  case 3:onemir(1);break;
  69                 }
  70                }
  71                else if(VROM_size)
  72                {
  73                 Fixerit();
  74                 PPUNTARAM=0;
  75                }
  76                break;
  77   case 0xf000: ROM_BANK16(0x8000,V);break;
  78  }
  79 }
  80
  81 static void Mapper68_StateRestore(int version)
  82 {
  83               if(!(mapbyte2[0]&0x10))
  84               {
  85                switch(mapbyte2[0]&3)
  86                {
  87                 case 0:MIRROR_SET(0);break;
  88                 case 1:MIRROR_SET(1);break;
  89                 case 2:onemir(0);break;
  90                 case 3:onemir(1);break;
  91                }
  92               }
  93               else if(VROM_size)
  94               {
  95                 Fixerit();
  96                 PPUNTARAM=0;
  97               }
  98 }
  99
 100 void Mapper68_init(void)
 101 {
 102  SetWriteHandler(0x8000,0xffff,Mapper68_write);
 103  MapStateRestore=Mapper68_StateRestore;
 104 }