boards/103.c

   1 /* FCE Ultra - NES/Famicom Emulator\r
   2  *\r
   3  * Copyright notice for this file:\r
   4  *  Copyright (C) 2007 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA\r
  19  */\r
  20 \r
  21 #include "mapinc.h"\r
  22 \r
  23 static uint8 reg0, reg1, reg2;\r
  24 static uint8 *WRAM=NULL;\r
  25 static uint32 WRAMSIZE;\r
  26 \r
  27 static SFORMAT StateRegs[]=\r
  28 {\r
  29   {&reg0, 1, "REG0"},\r
  30   {&reg1, 1, "REG1"},\r
  31   {&reg2, 1, "REG2"},\r
  32   {0}\r
  33 };\r
  34 \r
  35 static void Sync(void)\r
  36 {\r
  37   setchr8(0);\r
  38   setprg8(0x8000,0xc);\r
  39   setprg8(0xe000,0xf);\r
  40   if(reg2&0x10)\r
  41   {\r
  42     setprg8(0x6000,reg0);\r
  43     setprg8(0xa000,0xd);\r
  44     setprg8(0xc000,0xe);\r
  45   }\r
  46   else\r
  47   {\r
  48     setprg8r(0x10,0x6000,0);\r
  49     setprg4(0xa000,(0xd<<1));\r
  50     setprg2(0xb000,(0xd<<2)+2);\r
  51     setprg2r(0x10,0xb800,4);\r
  52     setprg2r(0x10,0xc000,5);\r
  53     setprg2r(0x10,0xc800,6);\r
  54     setprg2r(0x10,0xd000,7);\r
  55     setprg2(0xd800,(0xe<<2)+3);\r
  56   }\r
  57   setmirror(reg1^1);\r
  58 }\r
  59 \r
  60 static DECLFW(M103RamWrite0)\r
  61 {\r
  62   WRAM[A&0x1FFF]=V;\r
  63 }\r
  64 \r
  65 static DECLFW(M103RamWrite1)\r
  66 {\r
  67   WRAM[0x2000+((A-0xB800)&0x1FFF)]=V;\r
  68 }\r
  69 \r
  70 static DECLFW(M103Write0)\r
  71 {\r
  72   reg0=V&0xf;\r
  73   Sync();\r
  74 }\r
  75 \r
  76 static DECLFW(M103Write1)\r
  77 {\r
  78   reg1=(V>>3)&1;\r
  79   Sync();\r
  80 }\r
  81 \r
  82 static DECLFW(M103Write2)\r
  83 {\r
  84   reg2=V;\r
  85   Sync();\r
  86 }\r
  87 \r
  88 static void M103Power(void)\r
  89 {\r
  90   reg0=reg1=0; reg2=0;\r
  91   Sync();\r
  92   SetReadHandler(0x6000,0x7FFF,CartBR);\r
  93   SetWriteHandler(0x6000,0x7FFF,M103RamWrite0);\r
  94   SetReadHandler(0x8000,0xFFFF,CartBR);\r
  95   SetWriteHandler(0xB800,0xD7FF,M103RamWrite1);\r
  96   SetWriteHandler(0x8000,0x8FFF,M103Write0);\r
  97   SetWriteHandler(0xE000,0xEFFF,M103Write1);\r
  98   SetWriteHandler(0xF000,0xFFFF,M103Write2);\r
  99 }\r
 100 \r
 101 static void M103Close(void)\r
 102 {\r
 103   if(WRAM)\r
 104     FCEU_gfree(WRAM);\r
 105   WRAM=NULL;\r
 106 }\r
 107 \r
 108 static void StateRestore(int version)\r
 109 {\r
 110   Sync();\r
 111 }\r
 112 \r
 113 void Mapper103_Init(CartInfo *info)\r
 114 {\r
 115   info->Power=M103Power;\r
 116   info->Close=M103Close;\r
 117   GameStateRestore=StateRestore;\r
 118 \r
 119   WRAMSIZE=16384;\r
 120   WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);\r
 121   SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);\r
 122   AddExState(WRAM, WRAMSIZE, 0, "WRAM");\r
 123 \r
 124   AddExState(&StateRegs, ~0, 0, 0);\r
 125 }\r