boards/super24.c

   1 /* FCE Ultra - NES/Famicom Emulator
   2  *
   3  * Copyright notice for this file:
   4  *  Copyright (C) 2005 CaH4e3
   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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include "mapinc.h"
  22 #include "mmc3.h"
  23
  24 static uint8 *CHRRAM = NULL; // there is no more extern CHRRAM in mmc3.h
  25                                                          // I need chrram here and local   static == local
  26 static int masko8[8]={63,31,15,1,3,0,0,0};
  27
  28 static void Super24PW(uint32 A, uint8 V)
  29 {
  30   uint32 NV=V&masko8[EXPREGS[0]&7];
  31   NV|=(EXPREGS[1]<<1);
  32   setprg8r((NV>>6)&0xF,A,NV);
  33 }
  34
  35 static void Super24CW(uint32 A, uint8 V)
  36 {
  37   if(EXPREGS[0]&0x20)
  38     setchr1r(0x10,A,V);
  39   else
  40   {
  41     uint32 NV=V|(EXPREGS[2]<<3);
  42     setchr1r((NV>>9)&0xF,A,NV);
  43   }
  44 }
  45
  46 static DECLFW(Super24Write)
  47 {
  48   switch(A)
  49   {
  50     case 0x5FF0: EXPREGS[0]=V;
  51                  FixMMC3PRG(MMC3_cmd);
  52                  FixMMC3CHR(MMC3_cmd);
  53                  break;
  54     case 0x5FF1: EXPREGS[1]=V;
  55                  FixMMC3PRG(MMC3_cmd);
  56                  break;
  57     case 0x5FF2: EXPREGS[2]=V;
  58                  FixMMC3CHR(MMC3_cmd);
  59                  break;
  60   }
  61 }
  62
  63 static void Super24Power(void)
  64 {
  65   EXPREGS[0]=0x24;
  66   EXPREGS[1]=159;
  67   EXPREGS[2]=0;
  68   GenMMC3Power();
  69   SetWriteHandler(0x5000,0x7FFF,Super24Write);
  70   SetReadHandler(0x8000,0xFFFF,CartBR);
  71 }
  72
  73 static void Super24Reset(void)
  74 {
  75   EXPREGS[0]=0x24;
  76   EXPREGS[1]=159;
  77   EXPREGS[2]=0;
  78   MMC3RegReset();
  79 }
  80
  81 static void Super24Close(void)
  82 {
  83   if(CHRRAM)
  84     FCEU_gfree(CHRRAM);
  85   CHRRAM = NULL;
  86 }
  87
  88 void Super24_Init(CartInfo *info)
  89 {
  90   GenMMC3_Init(info, 128, 256, 0, 0);
  91   info->Power=Super24Power;
  92   info->Reset=Super24Reset;
  93   info->Close=Super24Close;
  94   cwrap=Super24CW;
  95   pwrap=Super24PW;
  96   CHRRAM=(uint8*)FCEU_gmalloc(8192);
  97   SetupCartCHRMapping(0x10, CHRRAM, 8192, 1);
  98   AddExState(CHRRAM, 8192, 0, "CHRR");
  99   AddExState(EXPREGS, 3, 0, "BIG2");
 100 }