merge mappers from FCEU-mm

[fceu.git] / boards / 183.c

/* FCE Ultra - NES/Famicom Emulator\r
 *\r
 * Copyright notice for this file:\r
 *  Copyright (C) 2005 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
 * Gimmick Bootleg (VRC4 mapper)\r
 */\r
\r
#include "mapinc.h"\r
\r
static uint8 prg[4];\r
static uint8 chr[8];\r
static uint8 IRQCount;\r
static uint8 IRQPre;\r
static uint8 IRQa;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {prg, 4, "PRG"},\r
  {chr, 8, "CHR"},\r
  {&IRQCount, 1, "IRQC"},\r
  {&IRQPre, 1, "IRQP"},\r
  {&IRQa, 1, "IRQA"},\r
  {0}\r
};\r
\r
static void SyncPrg(void)\r
{\r
  setprg8(0x6000,0);\r
  setprg8(0x8000,prg[0]);\r
  setprg8(0xA000,prg[1]);\r
  setprg8(0xC000,prg[2]);\r
  setprg8(0xE000,~0);\r
}\r
\r
static void SyncChr(void)\r
{\r
  int i;\r
  for(i=0; i<8; i++)\r
     setchr1(i<<10,chr[i]);\r
}\r
\r
static void StateRestore(int version)\r
{\r
  SyncPrg();\r
  SyncChr();\r
}\r
\r
static DECLFW(M183Write)\r
{\r
  if(((A&0xF80C)>=0xB000)&&((A&0xF80C)<=0xE00C))\r
  {\r
    int index=(((A>>11)-6)|(A>>3))&7;\r
    chr[index]=(chr[index]&(0xF0>>(A&4)))|((V&0x0F)<<(A&4));\r
    SyncChr();\r
  }\r
  else switch (A&0xF80C)\r
  {\r
    case 0x8800: prg[0]=V; SyncPrg(); break;\r
    case 0xA800: prg[1]=V; SyncPrg(); break;\r
    case 0xA000: prg[2]=V; SyncPrg(); break;\r
    case 0x9800: switch (V&3)\r
                 {\r
                   case 0: setmirror(MI_V); break;\r
                   case 1: setmirror(MI_H); break;\r
                   case 2: setmirror(MI_0); break;\r
                   case 3: setmirror(MI_1); break;\r
                 }\r
                 break;\r
    case 0xF000: IRQCount=((IRQCount&0xF0)|(V&0xF)); break;\r
    case 0xF004: IRQCount=((IRQCount&0x0F)|((V&0xF)<<4)); break;\r
    case 0xF008: IRQa=V; if(!V)IRQPre=0; X6502_IRQEnd(FCEU_IQEXT); break;\r
    case 0xF00C: IRQPre=16; break;\r
  }\r
}\r
\r
static void M183IRQCounter(void)\r
{\r
  if(IRQa)\r
  {\r
    IRQCount++;\r
    if((IRQCount-IRQPre)==238)\r
      X6502_IRQBegin(FCEU_IQEXT);\r
  }\r
}\r
\r
static void M183Power(void)\r
{\r
  IRQPre=IRQCount=IRQa=0;\r
  SetReadHandler(0x8000,0xFFFF,CartBR);\r
  SetWriteHandler(0x8000,0xFFFF,M183Write);\r
  SetReadHandler(0x6000,0x7FFF,CartBR);\r
  SyncPrg();\r
  SyncChr();\r
}\r
\r
void Mapper183_Init(CartInfo *info)\r
{\r
  info->Power=M183Power;\r
  GameHBIRQHook=M183IRQCounter;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r