boards/lh53.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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
  19  *\r
  20  * FDS Conversion\r
  21  *\r
  22  */\r
  23 \r
  24 #include "mapinc.h"\r
  25 \r
  26 static uint8 reg, IRQa;\r
  27 static int32 IRQCount;\r
  28 static uint8 *WRAM=NULL;\r
  29 static uint32 WRAMSIZE;\r
  30 \r
  31 static SFORMAT StateRegs[]=\r
  32 {\r
  33   {&reg, 1, "REG"},\r
  34   {&IRQa, 1, "IRQA"},\r
  35   {&IRQCount, 4, "IRQC"},\r
  36   {0}\r
  37 };\r
  38 \r
  39 static void Sync(void)\r
  40 {\r
  41   setchr8(0);\r
  42   setprg8(0x6000,reg);\r
  43   setprg8(0x8000,0xc);\r
  44   setprg4(0xa000,(0xd<<1));\r
  45   setprg2(0xb000,(0xd<<2)+2);\r
  46   setprg2r(0x10,0xb800,4);\r
  47   setprg2r(0x10,0xc000,5);\r
  48   setprg2r(0x10,0xc800,6);\r
  49   setprg2r(0x10,0xd000,7);\r
  50   setprg2(0xd800,(0xe<<2)+3);\r
  51   setprg8(0xe000,0xf);\r
  52 }\r
  53 \r
  54 static DECLFW(LH53RamWrite)\r
  55 {\r
  56   WRAM[(A-0xB800)&0x1FFF]=V;\r
  57 }\r
  58 \r
  59 static DECLFW(LH53Write)\r
  60 {\r
  61   reg=V;\r
  62   Sync();\r
  63 }\r
  64 \r
  65 static DECLFW(LH53IRQaWrite)\r
  66 {\r
  67   IRQa = V&2;\r
  68   IRQCount = 0;\r
  69   if(!IRQa)\r
  70     X6502_IRQEnd(FCEU_IQEXT);\r
  71 }\r
  72 \r
  73 static void FP_FASTAPASS(1) LH53IRQ(int a)\r
  74 {\r
  75   if(IRQa)\r
  76   {\r
  77     IRQCount+=a;\r
  78     if(IRQCount>7560)\r
  79       X6502_IRQBegin(FCEU_IQEXT);\r
  80   }\r
  81 }\r
  82 \r
  83 static void LH53Power(void)\r
  84 {\r
  85   Sync();\r
  86   SetReadHandler(0x6000,0xFFFF,CartBR);\r
  87   SetWriteHandler(0xB800,0xD7FF,LH53RamWrite);\r
  88   SetWriteHandler(0xE000,0xEFFF,LH53IRQaWrite);\r
  89   SetWriteHandler(0xF000,0xFFFF,LH53Write);\r
  90 }\r
  91 \r
  92 static void LH53Close(void)\r
  93 {\r
  94   if(WRAM)\r
  95     FCEU_gfree(WRAM);\r
  96   WRAM=NULL;\r
  97 }\r
  98 \r
  99 static void StateRestore(int version)\r
 100 {\r
 101   Sync();\r
 102 }\r
 103 \r
 104 void LH53_Init(CartInfo *info)\r
 105 {\r
 106   info->Power=LH53Power;\r
 107   info->Close=LH53Close;\r
 108   MapIRQHook=LH53IRQ;\r
 109   GameStateRestore=StateRestore;\r
 110 \r
 111   WRAMSIZE=8192;\r
 112   WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);\r
 113   SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);\r
 114   AddExState(WRAM, WRAMSIZE, 0, "WRAM");\r
 115 \r
 116   AddExState(&StateRegs, ~0, 0, 0);\r
 117 }\r