random warning fixes

[fceu.git] / boards / 91.c

/* FCE Ultra - NES/Famicom Emulator\r
 *\r
 * Copyright notice for this file:\r
 *  Copyright (C) 2012 CaH4e3\r
 *\r
 * This program is free software; you can redistribute it and/or modify\r
 * it under the terms of the GNU General Public License as published by\r
 * the Free Software Foundation; either version 2 of the License, or\r
 * (at your option) any later version.\r
 *\r
 * This program is distributed in the hope that it will be useful,\r
 * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
 * GNU General Public License for more details.\r
 *\r
 * You should have received a copy of the GNU General Public License\r
 * along with this program; if not, write to the Free Software\r
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
 */\r
\r
#include "mapinc.h"\r
\r
static uint8 cregs[4], pregs[2];\r
static uint8 IRQCount, IRQa;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {cregs, 4, "CREG"},\r
  {pregs, 2, "PREG"},\r
  {&IRQa, 1, "IRQA"},\r
  {&IRQCount, 1, "IRQC"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  setprg8(0x8000,pregs[0]);\r
  setprg8(0xa000,pregs[1]);\r
  setprg8(0xc000,~1);\r
  setprg8(0xe000,~0);\r
  setchr2(0x0000,cregs[0]);\r
  setchr2(0x0800,cregs[1]);\r
  setchr2(0x1000,cregs[2]);\r
  setchr2(0x1800,cregs[3]);\r
}\r
\r
static DECLFW(M91Write0)\r
{\r
  cregs[A & 3] = V;\r
  Sync();\r
}\r
\r
static DECLFW(M91Write1)\r
{\r
  switch (A & 3)\r
  {\r
    case 0:\r
    case 1: pregs[A & 1] = V; Sync(); break;\r
    case 2: IRQa = IRQCount = 0; X6502_IRQEnd(FCEU_IQEXT); break;\r
    case 3: IRQa = 1; X6502_IRQEnd(FCEU_IQEXT); break;\r
  }\r
}\r
\r
static void M91Power(void)\r
{\r
  Sync();\r
  SetWriteHandler(0x6000,0x6fff,M91Write0);\r
  SetWriteHandler(0x7000,0x7fff,M91Write1);\r
  SetReadHandler(0x8000,0xffff,CartBR);\r
}\r
\r
static void M91IRQHook(void)\r
{\r
  if(IRQCount<8 && IRQa)\r
  {\r
    IRQCount++;\r
    if(IRQCount>=8)\r
    {\r
      X6502_IRQBegin(FCEU_IQEXT);   \r
    } \r
  }\r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
}\r
\r
void Mapper91_Init(CartInfo *info)\r
{\r
  info->Power=M91Power;\r
  GameHBIRQHook=M91IRQHook;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r