boards/ghostbusters63in1.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  * 63in1 ghostbusters\r
  20  */\r
  21 \r
  22 #include "mapinc.h"\r
  23 \r
  24 static uint8 reg[2], bank;\r
  25 static uint8 banks[4] = {0, 0, 1, 2};\r
  26 static uint8 *CHRROM=NULL;\r
  27 static uint32 CHRROMSIZE;\r
  28 \r
  29 static SFORMAT StateRegs[]=\r
  30 {\r
  31   {reg, 2, "REGS"},\r
  32   {&bank, 1, "BANK"},\r
  33   {0}\r
  34 };\r
  35 \r
  36 static void Sync(void)\r
  37 {\r
  38   if(reg[0]&0x20)\r
  39   {\r
  40     setprg16r(banks[bank],0x8000,reg[0]&0x1F);\r
  41     setprg16r(banks[bank],0xC000,reg[0]&0x1F);\r
  42   }\r
  43   else\r
  44     setprg32r(banks[bank],0x8000,(reg[0]>>1)&0x0F);\r
  45   if(reg[1]&2)\r
  46     setchr8r(0x10,0);\r
  47   else\r
  48     setchr8(0);\r
  49   setmirror((reg[0]&0x40)>>6);\r
  50 }\r
  51 \r
  52 static DECLFW(BMCGhostbusters63in1Write)\r
  53 {\r
  54   reg[A&1]=V;\r
  55   bank=((reg[0]&0x80)>>7)|((reg[1]&1)<<1);\r
  56 //  FCEU_printf("reg[0]=%02x, reg[1]=%02x, bank=%02x\n",reg[0],reg[1],bank);\r
  57   Sync();\r
  58 }\r
  59 \r
  60 static DECLFR(BMCGhostbusters63in1Read)\r
  61 {\r
  62   if(bank==1)\r
  63     return X.DB;\r
  64   else\r
  65     return CartBR(A);\r
  66 }\r
  67 \r
  68 static void BMCGhostbusters63in1Power(void)\r
  69 {\r
  70   reg[0]=reg[1]=0;\r
  71   Sync();\r
  72   SetReadHandler(0x8000,0xFFFF,BMCGhostbusters63in1Read);\r
  73   SetWriteHandler(0x8000,0xFFFF,BMCGhostbusters63in1Write);\r
  74 }\r
  75 \r
  76 static void BMCGhostbusters63in1Reset(void)\r
  77 {\r
  78   reg[0]=reg[1]=0;\r
  79 }\r
  80 \r
  81 static void StateRestore(int version)\r
  82 {\r
  83   Sync();\r
  84 }\r
  85 \r
  86 static void BMCGhostbusters63in1Close(void)\r
  87 {\r
  88   if(CHRROM)\r
  89     FCEU_gfree(CHRROM);\r
  90   CHRROM=NULL;\r
  91 }\r
  92 \r
  93 void BMCGhostbusters63in1_Init(CartInfo *info)\r
  94 {\r
  95   info->Reset=BMCGhostbusters63in1Reset;\r
  96   info->Power=BMCGhostbusters63in1Power;\r
  97   info->Close=BMCGhostbusters63in1Close;\r
  98 \r
  99   CHRROMSIZE=8192; // dummy CHRROM, VRAM disable\r
 100   CHRROM=(uint8*)FCEU_gmalloc(CHRROMSIZE);\r
 101   SetupCartPRGMapping(0x10,CHRROM,CHRROMSIZE,0);\r
 102   AddExState(CHRROM, CHRROMSIZE, 0, "CHRROM");\r
 103 \r
 104   GameStateRestore=StateRestore;\r
 105   AddExState(&StateRegs, ~0, 0, 0);\r
 106 }\r