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tengen.c

/* FCE Ultra - NES/Famicom Emulator
 *
 * Copyright notice for this file:
 *  Copyright (C) 2002 Xodnizel
 *
 * 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
 */

#include "mapinc.h"

static uint8 cmd,mir,rmode,IRQmode;
static uint8 DRegs[11];
static uint8 IRQCount,IRQa,IRQLatch;

static SFORMAT Rambo_StateRegs[]={
      {&cmd, 1, "CMD"},
      {&mir, 1, "MIR"},
      {&rmode, 1, "RMOD"},
      {&IRQmode, 1, "IRQM"},
      {&IRQCount, 1, "IRQC"},
      {&IRQa, 1, "IRQA"},
      {&IRQLatch, 1, "IRQL"},
      {DRegs, 11, "DREG"},
      {0}
};

static void FP_FASTAPASS(2) (*setchr1wrap)(unsigned int A, unsigned int V);
static int nomirror;

static void FP_FASTAPASS(1) RAMBO1_IRQHook(int a)
{
 static int smallcount;
 if(!IRQmode) return;

 smallcount+=a;
 while(smallcount>=4)
 {
  smallcount-=4;
  IRQCount--;
  if(IRQCount==0xFF)
  {
   if(IRQa)
   {
    //printf("IRQ: %d\n",scanline);
    //rmode = 1;
    X6502_IRQBegin(FCEU_IQEXT);
   }
  }
 }
}

static void RAMBO1_hb(void)
{
      if(IRQmode) return;
      if(scanline==240) return;     /* hmm.  Maybe that should be an mmc3-only
                                 call in fce.c. */
      rmode=0;
      IRQCount--;
      if(IRQCount==0xFF)
      {
       if(IRQa)
       {
        rmode = 1;
        X6502_IRQBegin(FCEU_IQEXT);
       }
      }
}

static void Synco(void)
{
 int x;

 if(cmd&0x20)
 {
  setchr1wrap(0x0000,DRegs[0]);
  setchr1wrap(0x0800,DRegs[1]);
  setchr1wrap(0x0400,DRegs[8]);
  setchr1wrap(0x0c00,DRegs[9]);
 }
 else
 {
  setchr1wrap(0x0000,(DRegs[0]&0xFE));
  setchr1wrap(0x0400,(DRegs[0]&0xFE)|1);
  setchr1wrap(0x0800,(DRegs[1]&0xFE));
  setchr1wrap(0x0C00,(DRegs[1]&0xFE)|1);
 }

 for(x=0;x<4;x++)
  setchr1wrap(0x1000+x*0x400,DRegs[2+x]);

 setprg8(0x8000,DRegs[6]);
 setprg8(0xA000,DRegs[7]);

 setprg8(0xC000,DRegs[10]);
}


static DECLFW(RAMBO1_write)
{
 //if(A>=0xC000 && A<=0xFFFF) printf("$%04x:$%02x, %d, %d\n",A,V,scanline,timestamp);
 switch(A&0xF001)
 {
        case 0xa000:mir=V&1;
                if(!nomirror)
                 setmirror(mir^1);
                break;
        case 0x8000:cmd = V;
                break;
        case 0x8001:
                if((cmd&0xF)<10)
                 DRegs[cmd&0xF]=V;
                else if((cmd&0xF)==0xF)
                 DRegs[10]=V;
                Synco();
                break;
        case 0xc000:IRQLatch=V;
                    if(rmode==1)
                     {
                      IRQCount=IRQLatch;
                     }
                    break;
        case 0xc001:rmode=1;
                    IRQCount=IRQLatch;
                IRQmode=V&1;
                    break;
        case 0xE000:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);
                    if(rmode==1)
                     {IRQCount=IRQLatch;}
                    break;
        case 0xE001:IRQa=1;
                    if(rmode==1)
                     {IRQCount=IRQLatch;}
                    break;
  }   
}

static void RAMBO1_Restore(int version)
{
 Synco();
 if(!nomirror)
  setmirror(mir^1);
}

static void RAMBO1_init(void)
{
      int x;
 
        for(x=0;x<11;x++)
         DRegs[x]=~0;
        cmd=0;
        mir=0;
      if(!nomirror)
         setmirror(1);
        Synco();
        GameHBIRQHook=RAMBO1_hb;
        MapIRQHook=RAMBO1_IRQHook;
        GameStateRestore=RAMBO1_Restore;
        SetWriteHandler(0x8000,0xffff,RAMBO1_write);

      AddExState(Rambo_StateRegs, ~0, 0, 0);
}

static void FP_FASTAPASS(2) CHRWrap(unsigned int A, unsigned int V)
{
 setchr1(A,V);
}

void Mapper64_init(void)
{
      setchr1wrap=CHRWrap;
      nomirror=0;
      RAMBO1_init();
}

static int MirCache[8];
static unsigned int PPUCHRBus;

static void FP_FASTAPASS(2) MirWrap(unsigned int A, unsigned int V)
{
 MirCache[A>>10]=(V>>7)&1;
 if(PPUCHRBus==(A>>10))
  setmirror(MI_0+((V>>7)&1));
 setchr1(A,V);
}

static void FP_FASTAPASS(1) MirrorFear(uint32 A)
{
 A&=0x1FFF;
 A>>=10;
 PPUCHRBus=A;
 setmirror(MI_0+MirCache[A]);
}

void Mapper158_init(void)
{
      setchr1wrap=MirWrap;
      PPU_hook=MirrorFear;
      nomirror=1;
      RAMBO1_init();
}


static DECLFW(MIMIC1_Write)
{


}

void Mapper159_init(void)
{
      SetWriteHandler(0x8000,0xFFFF,MIMIC1_Write);
}

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