boards/106.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 reg[16], IRQa;\r
  24 static uint32 IRQCount;\r
  25 static uint8 *WRAM=NULL;\r
  26 static uint32 WRAMSIZE;\r
  27 \r
  28 static SFORMAT StateRegs[]=\r
  29 {\r
  30   {&IRQa, 1, "IRQA"},\r
  31   {&IRQCount, 4, "IRQCOUNT"},\r
  32   {reg, 16, "REGS"},\r
  33   {0}\r
  34 };\r
  35 \r
  36 static void Sync(void)\r
  37 {\r
  38   setchr1(0x0000,reg[0]&0xfe);\r
  39   setchr1(0x0400,reg[1]|1);\r
  40   setchr1(0x0800,reg[2]&0xfe);\r
  41   setchr1(0x0c00,reg[3]|1);\r
  42   setchr1(0x1000,reg[4]);\r
  43   setchr1(0x1400,reg[5]);\r
  44   setchr1(0x1800,reg[6]);\r
  45   setchr1(0x1c00,reg[7]);\r
  46   setprg8r(0x10,0x6000,0);\r
  47   setprg8(0x8000,(reg[0x8]&0xf)|0x10);\r
  48   setprg8(0xA000,(reg[0x9]&0x1f));\r
  49   setprg8(0xC000,(reg[0xa]&0x1f));\r
  50   setprg8(0xE000,(reg[0xb]&0xf)|0x10);\r
  51   setmirror((reg[0xc]&1)^1);\r
  52 }\r
  53 \r
  54 static DECLFW(M106Write)\r
  55 {\r
  56   A&=0xF;\r
  57   switch(A)\r
  58   {\r
  59     case 0xD: IRQa=0; IRQCount=0; X6502_IRQEnd(FCEU_IQEXT); break;\r
  60     case 0xE: IRQCount=(IRQCount&0xFF00)|V; break;\r
  61     case 0xF: IRQCount=(IRQCount&0x00FF)|(V<<8); IRQa=1; break;\r
  62     default: reg[A]=V; Sync(); break;\r
  63   }\r
  64 }\r
  65 \r
  66 static void M106Power(void)\r
  67 {\r
  68   reg[8]=reg[9]=reg[0xa]=reg[0xb]=-1;\r
  69   Sync();\r
  70   SetReadHandler(0x6000,0x7FFF,CartBR);\r
  71   SetReadHandler(0x8000,0xFFFF,CartBR);\r
  72   SetWriteHandler(0x6000,0x7FFF,CartBW);\r
  73   SetWriteHandler(0x8000,0xFFFF,M106Write);\r
  74 }\r
  75 \r
  76 static void M106Reset(void)\r
  77 {\r
  78 }\r
  79 \r
  80 static void M106Close(void)\r
  81 {\r
  82   if(WRAM)\r
  83     FCEU_gfree(WRAM);\r
  84   WRAM=NULL;\r
  85 }\r
  86 \r
  87 void M106CpuHook(int a)\r
  88 {\r
  89   if(IRQa)\r
  90   {\r
  91     IRQCount+=a;\r
  92     if(IRQCount>0x10000)\r
  93     {\r
  94       X6502_IRQBegin(FCEU_IQEXT);\r
  95       IRQa=0;\r
  96     }\r
  97   }\r
  98 }\r
  99 \r
 100 static void StateRestore(int version)\r
 101 {\r
 102   Sync();\r
 103 }\r
 104 \r
 105 void Mapper106_Init(CartInfo *info)\r
 106 {\r
 107   info->Reset=M106Reset;\r
 108   info->Power=M106Power;\r
 109   info->Close=M106Close;\r
 110   MapIRQHook=M106CpuHook;\r
 111   GameStateRestore=StateRestore;\r
 112 \r
 113   WRAMSIZE=8192;\r
 114   WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);\r
 115   SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);\r
 116   AddExState(WRAM, WRAMSIZE, 0, "WRAM");\r
 117 \r
 118   AddExState(&StateRegs, ~0, 0, 0);\r
 119 }\r