boards/ks7032.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[8], cmd, IRQa;\r
  24 static int32 IRQCount;\r
  25 \r
  26 static SFORMAT StateRegs[]=\r
  27 {\r
  28   {&cmd, 1, "CMD"},\r
  29   {reg, 8, "REGS"},\r
  30   {&IRQa, 1, "IRQA"},\r
  31   {&IRQCount, 4, "IRQC"},\r
  32   {0}\r
  33 };\r
  34 \r
  35 static void Sync(void)\r
  36 {\r
  37   setprg8(0x6000,reg[4]);\r
  38   setprg8(0x8000,reg[1]);\r
  39   setprg8(0xA000,reg[2]);\r
  40   setprg8(0xC000,reg[3]);\r
  41   setprg8(0xE000,~0);\r
  42   setchr8(0);\r
  43 }\r
  44 \r
  45 static DECLFW(UNLKS7032Write)\r
  46 {\r
  47 //  FCEU_printf("bs %04x %02x\n",A,V);\r
  48   switch(A)\r
  49   {\r
  50 //    case 0x8FFF: reg[4]=V; Sync(); break;\r
  51     case 0x8000: X6502_IRQEnd(FCEU_IQEXT); IRQCount=(IRQCount&0x000F)|(V&0x0F); break;\r
  52     case 0x9000: X6502_IRQEnd(FCEU_IQEXT); IRQCount=(IRQCount&0x00F0)|((V&0x0F)<<4); break;\r
  53     case 0xA000: X6502_IRQEnd(FCEU_IQEXT); IRQCount=(IRQCount&0x0F00)|((V&0x0F)<<8); break;\r
  54     case 0xB000: X6502_IRQEnd(FCEU_IQEXT); IRQCount=(IRQCount&0xF000)|(V<<12); break;\r
  55     case 0xC000: X6502_IRQEnd(FCEU_IQEXT); IRQa=1; break;\r
  56     case 0xE000: cmd=V&7; break;\r
  57     case 0xF000: reg[cmd]=V; Sync(); break;\r
  58   }\r
  59 }\r
  60 \r
  61 static void UNLSMB2JIRQHook(int a)\r
  62 {\r
  63   if(IRQa)\r
  64   {\r
  65     IRQCount+=a;\r
  66     if(IRQCount>=0xFFFF)\r
  67     {\r
  68       IRQa=0;\r
  69       IRQCount=0;\r
  70       X6502_IRQBegin(FCEU_IQEXT);\r
  71     }\r
  72   }\r
  73 }\r
  74 \r
  75 static void UNLKS7032Power(void)\r
  76 {\r
  77   Sync();\r
  78   SetReadHandler(0x6000,0x7FFF,CartBR);\r
  79   SetReadHandler(0x8000,0xFFFF,CartBR);\r
  80   SetWriteHandler(0x4020,0xFFFF,UNLKS7032Write);\r
  81 }\r
  82 \r
  83 static void StateRestore(int version)\r
  84 {\r
  85   Sync();\r
  86 }\r
  87 \r
  88 void UNLKS7032_Init(CartInfo *info)\r
  89 {\r
  90   info->Power=UNLKS7032Power;\r
  91   MapIRQHook=UNLSMB2JIRQHook;\r
  92   GameStateRestore=StateRestore;\r
  93   AddExState(&StateRegs, ~0, 0, 0);\r
  94 }\r