merge mapper code from FCEUX

[fceu.git] / boards / 222.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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA\r
 * (VRC4 mapper)\r
 */\r
\r
#include "mapinc.h"\r
\r
static uint8 IRQCount;\r
static uint8 IRQa;\r
static uint8 prg_reg[2];\r
static uint8 chr_reg[8];\r
static uint8 mirr;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {&IRQCount, 1, "IRQC"},\r
  {&IRQa, 1, "IRQA"},\r
  {prg_reg, 2, "PRG"},\r
  {chr_reg, 8, "CHR"},\r
  {&mirr, 1, "MIRR"},\r
  {0}\r
};\r
\r
static void M222IRQ(void)\r
{\r
  if(IRQa)\r
  {\r
    IRQCount++;\r
    if(IRQCount>=238)\r
    {\r
      X6502_IRQBegin(FCEU_IQEXT);\r
//      IRQa=0;\r
    }\r
  }\r
}\r
\r
static void Sync(void)\r
{\r
  int i;\r
  setprg8(0x8000,prg_reg[0]);\r
  setprg8(0xA000,prg_reg[1]);\r
  for(i=0; i<8; i++)\r
     setchr1(i<<10,chr_reg[i]);\r
  setmirror(mirr^1);\r
}\r
\r
static DECLFW(M222Write)\r
{\r
  switch(A&0xF003)\r
  {\r
    case 0x8000: prg_reg[0]=V; break;\r
    case 0x9000: mirr=V&1;     break;\r
    case 0xA000: prg_reg[1]=V; break;\r
    case 0xB000: chr_reg[0]=V; break;\r
    case 0xB002: chr_reg[1]=V; break;\r
    case 0xC000: chr_reg[2]=V; break;\r
    case 0xC002: chr_reg[3]=V; break;\r
    case 0xD000: chr_reg[4]=V; break;\r
    case 0xD002: chr_reg[5]=V; break;\r
    case 0xE000: chr_reg[6]=V; break;\r
    case 0xE002: chr_reg[7]=V; break;\r
//    case 0xF000: FCEU_printf("%04x:%02x %d\n",A,V,scanline); IRQa=V; if(!V)IRQPre=0; X6502_IRQEnd(FCEU_IQEXT); break;\r
//  /  case 0xF001: FCEU_printf("%04x:%02x %d\n",A,V,scanline); IRQCount=V; break;\r
//    case 0xF002: FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;\r
//    case 0xD001: IRQa=V; X6502_IRQEnd(FCEU_IQEXT); FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;\r
//    case 0xC001: IRQPre=16; FCEU_printf("%04x:%02x %d\n",A,V,scanline); break;\r
    case 0xF000: IRQa=IRQCount=V; if(scanline<240) IRQCount-=8; else IRQCount+=4; X6502_IRQEnd(FCEU_IQEXT); break;\r
  }\r
  Sync();\r
}\r
\r
static void M222Power(void)\r
{\r
  setprg16(0xC000,~0);\r
  SetReadHandler(0x8000,0xFFFF,CartBR);\r
  SetWriteHandler(0x8000,0xFFFF,M222Write);\r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
}\r
\r
void Mapper222_Init(CartInfo *info)\r
{\r
  info->Power=M222Power;\r
  GameHBIRQHook=M222IRQ;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r