fceux/src/boards/ax5705.cpp

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2007 CaH4e3
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Super Bros. Pocker Mali (VRC4 mapper)
 */

#include "mapinc.h"

static uint8 IRQCount;//, IRQPre;
static uint8 IRQa;
static uint8 prg_reg[2];
static uint8 chr_reg[8];
static uint8 mirr;

static SFORMAT StateRegs[]=
{
  {&IRQCount, 1, "IRQC"},
  {&IRQa, 1, "IRQA"},
  {prg_reg, 2, "PRG"},
  {chr_reg, 8, "CHR"},
  {&mirr, 1, "MIRR"},
  {0}
};

/*
static void UNLAX5705IRQ(void)
{
  if(IRQa)
  {
    IRQCount++;
    if(IRQCount>=238)
    {
      X6502_IRQBegin(FCEU_IQEXT);
//      IRQa=0;
    }
  }
}*/

static void Sync(void)
{
  int i;
  setprg8(0x8000,prg_reg[0]);
  setprg8(0xA000,prg_reg[1]);
  setprg8(0xC000,~1);
  setprg8(0xE000,~0);
  for(i=0; i<8; i++)
     setchr1(i<<10,chr_reg[i]);     
  setmirror(mirr^1);   
}

static DECLFW(UNLAX5705Write)
{
//  if((A>=0xA008)&&(A<=0xE003))
//  {
//    int ind=(((A>>11)-6)|(A&1))&7;
//    int sar=((A&2)<<1);
//    chr_reg[ind]=(chr_reg[ind]&(0xF0>>sar))|((V&0x0F)<<sar);
//    SyncChr();
//  }
//  else 
  switch(A&0xF00F)
  {
    case 0x8000: prg_reg[0]=((V&2)<<2)|((V&8)>>2)|(V&5); break; // EPROM dump have mixed PRG and CHR banks, data lines to mapper seems to be mixed
    case 0x8008: mirr=V&1; break;
    case 0xA000: prg_reg[1]=((V&2)<<2)|((V&8)>>2)|(V&5); break;
    case 0xA008: chr_reg[0]=(chr_reg[0]&0xF0)|(V&0x0F); break;
    case 0xA009: chr_reg[0]=(chr_reg[0]&0x0F)|((((V&4)>>1)|((V&2)<<1)|(V&0x09))<<4); break;
    case 0xA00A: chr_reg[1]=(chr_reg[1]&0xF0)|(V&0x0F); break;
    case 0xA00B: chr_reg[1]=(chr_reg[1]&0x0F)|((((V&4)>>1)|((V&2)<<1)|(V&0x09))<<4); break;
    case 0xC000: chr_reg[2]=(chr_reg[2]&0xF0)|(V&0x0F); break;
    case 0xC001: chr_reg[2]=(chr_reg[2]&0x0F)|((((V&4)>>1)|((V&2)<<1)|(V&0x09))<<4); break;
    case 0xC002: chr_reg[3]=(chr_reg[3]&0xF0)|(V&0x0F); break;
    case 0xC003: chr_reg[3]=(chr_reg[3]&0x0F)|((((V&4)>>1)|((V&2)<<1)|(V&0x09))<<4); break;
    case 0xC008: chr_reg[4]=(chr_reg[4]&0xF0)|(V&0x0F); break;
    case 0xC009: chr_reg[4]=(chr_reg[4]&0x0F)|((((V&4)>>1)|((V&2)<<1)|(V&0x09))<<4); break;
    case 0xC00A: chr_reg[5]=(chr_reg[5]&0xF0)|(V&0x0F); break;
    case 0xC00B: chr_reg[5]=(chr_reg[5]&0x0F)|((((V&4)>>1)|((V&2)<<1)|(V&0x09))<<4); break;
    case 0xE000: chr_reg[6]=(chr_reg[6]&0xF0)|(V&0x0F); break;
    case 0xE001: chr_reg[6]=(chr_reg[6]&0x0F)|((((V&4)>>1)|((V&2)<<1)|(V&0x09))<<4); break;
    case 0xE002: chr_reg[7]=(chr_reg[7]&0xF0)|(V&0x0F); break;
    case 0xE003: chr_reg[7]=(chr_reg[7]&0x0F)|((((V&4)>>1)|((V&2)<<1)|(V&0x09))<<4); break;
//    case 0x800A: X6502_IRQEnd(FCEU_IQEXT); IRQa=0; break;
//    case 0xE00B: X6502_IRQEnd(FCEU_IQEXT); IRQa=IRQCount=V; /*if(scanline<240) IRQCount-=8; else IRQCount+=4;*/  break;
  }
  Sync();
}

static void UNLAX5705Power(void)
{
  Sync();
  SetReadHandler(0x8000,0xFFFF,CartBR);
  SetWriteHandler(0x8000,0xFFFF,UNLAX5705Write);
}

static void StateRestore(int version)
{
  Sync();
}

void UNLAX5705_Init(CartInfo *info)
{
  info->Power=UNLAX5705Power;
//  GameHBIRQHook=UNLAX5705IRQ;
  GameStateRestore=StateRestore;
  AddExState(&StateRegs, ~0, 0, 0);
}