boards/super24.c

   1 /* FCE Ultra - NES/Famicom Emulator\r
   2  *\r
   3  * Copyright notice for this file:\r
   4  *  Copyright (C) 2005 CaH4e3\r
   5  *\r
   6  * This program is free software; you can redistribute it and/or modify\r
   7  * it under the terms of the GNU General Public License as published by\r
   8  * the Free Software Foundation; either version 2 of the License, or\r
   9  * (at your option) any later version.\r
  10  *\r
  11  * This program is distributed in the hope that it will be useful,\r
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14  * GNU General Public License for more details.\r
  15  *\r
  16  * You should have received a copy of the GNU General Public License\r
  17  * along with this program; if not, write to the Free Software\r
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
  19  */\r
  20 \r
  21 #include "mapinc.h"\r
  22 #include "mmc3.h"\r
  23 \r
  24 static uint8 *CHRRAM = NULL;\r
  25 static uint8 resetmode;\r
  26 static int masko8[8]={63,31,15,1,3,0,0,0};\r
  27 \r
  28 static void Super24PW(uint32 A, uint8 V)\r
  29 {\r
  30  uint32 NV=V&masko8[EXPREGS[0]&7];\r
  31  NV|=(EXPREGS[1]<<1);\r
  32  setprg8r((NV>>6)&0xF,A,NV);\r
  33 }\r
  34 \r
  35 static void Super24CW(uint32 A, uint8 V)\r
  36 {\r
  37  if(EXPREGS[0]&0x20)\r
  38   setchr1r(0x10,A,V);\r
  39  else\r
  40  {\r
  41   uint32 NV=V|(EXPREGS[2]<<3);\r
  42   setchr1r((NV>>9)&0xF,A,NV);\r
  43  }\r
  44 }\r
  45 \r
  46 static DECLFW(Super24Write)\r
  47 {\r
  48  switch(A)\r
  49  {\r
  50   case 0x5FF0: EXPREGS[0]=V;\r
  51                FixMMC3PRG(MMC3_cmd);\r
  52                FixMMC3CHR(MMC3_cmd);\r
  53                break;\r
  54   case 0x5FF1: EXPREGS[1]=V;\r
  55                FixMMC3PRG(MMC3_cmd);\r
  56                break;\r
  57   case 0x5FF2: EXPREGS[2]=V;\r
  58                FixMMC3CHR(MMC3_cmd);\r
  59                break;\r
  60  }\r
  61 }\r
  62 \r
  63 static DECLFW(Super24IRQ)\r
  64 {\r
  65   switch(A&0xE001)\r
  66   {\r
  67     case 0xc000: IRQLatch=V;\r
  68                  if(resetmode==1)\r
  69                    IRQCount=IRQLatch;\r
  70                  break;\r
  71     case 0xc001: resetmode=1;\r
  72                  IRQCount=IRQLatch;\r
  73                  break;\r
  74     case 0xE000: IRQa=0;\r
  75                  X6502_IRQEnd(FCEU_IQEXT);\r
  76                  if(resetmode==1)\r
  77                    IRQCount=IRQLatch;\r
  78                  break;\r
  79     case 0xE001: IRQa=1;\r
  80                  if(resetmode==1)\r
  81                    IRQCount=IRQLatch;\r
  82                  break;\r
  83   }\r
  84 }\r
  85 \r
  86 static void Super24HB(void)\r
  87 {\r
  88   resetmode=0;\r
  89   if(IRQCount!=0)\r
  90   {\r
  91     IRQCount--;\r
  92     if(IRQCount==0)\r
  93     {\r
  94       if(IRQa)\r
  95       {\r
  96         resetmode=1;\r
  97         X6502_IRQBegin(FCEU_IQEXT);\r
  98       }\r
  99     }\r
 100   }\r
 101 }\r
 102 \r
 103 static void Super24Power(void)\r
 104 {\r
 105  EXPREGS[0]=0x24;\r
 106  EXPREGS[1]=159;\r
 107  EXPREGS[2]=0;\r
 108  GenMMC3Power();\r
 109  SetWriteHandler(0x5000,0x7FFF,Super24Write);\r
 110  SetWriteHandler(0xC000,0xFFFF,Super24IRQ);\r
 111  SetReadHandler(0x8000,0xFFFF,CartBR);\r
 112 }\r
 113 \r
 114 static void Super24Reset(void)\r
 115 {\r
 116  EXPREGS[0]=0x24;\r
 117  EXPREGS[1]=159;\r
 118  EXPREGS[2]=0;\r
 119  MMC3RegReset();\r
 120 }\r
 121 \r
 122 static void Super24Close(void)\r
 123 {\r
 124  if(CHRRAM)\r
 125   FCEU_gfree(CHRRAM);\r
 126  CHRRAM = NULL;\r
 127 }\r
 128 \r
 129 void Super24_Init(CartInfo *info)\r
 130 {\r
 131  info->Power=Super24Power;\r
 132  info->Reset=Super24Reset;\r
 133  info->Close=Super24Close;\r
 134  cwrap=Super24CW;\r
 135  pwrap=Super24PW;\r
 136   CHRRAM=(uint8*)FCEU_gmalloc(8192);\r
 137  SetupCartCHRMapping(0x10, CHRRAM, 8192, 1);\r
 138  GameHBIRQHook=Super24HB;\r
 139  AddExState(CHRRAM, 8192, 0, "CHRR");\r
 140  AddExState(EXPREGS, 3, 0, "BIG2");\r
 141 }\r