mappers/187.c

   1 /* FCE Ultra - NES/Famicom Emulator
   2  *
   3  * Copyright notice for this file:
   4  *  Copyright (C) 2003 Xodnizel
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "mapinc.h"
  22
  23 static uint8 LastWr;
  24 static uint8 ExtMode;
  25 static uint8 cmd;
  26 static uint8 DRegs[8];
  27 static uint32 count=0;
  28 static uint32 last=0;
  29 static int safe=0;
  30 static uint8 poofish;
  31
  32 static void Sync(void)
  33 {
  34  int x;
  35  uint32 base=0;
  36
  37  if(cmd&0x80) base=0x1000;
  38  setchr2(0x0000^base,(0x100|DRegs[0])>>1);
  39  setchr2(0x0800^base,(0x100|DRegs[1])>>1);
  40  for(x=0;x<4;x++)
  41   setchr1((0x1000^base)+x*0x400,DRegs[2+x]);
  42
  43  if(ExtMode&0x80)
  44  {
  45   if(ExtMode&0x20)
  46    setprg32(0x8000,(ExtMode&0x1F)>>1);
  47   else
  48   {
  49    setprg16(0x8000,(ExtMode&0x1F));
  50    setprg16(0xc000,(ExtMode&0x1F));
  51   }
  52  }
  53  else
  54  {
  55   setprg8(0x8000,DRegs[6]);
  56   setprg8(0xa000,DRegs[7]);
  57   setprg8(0xc000,~1);
  58   setprg8(0xe000,~0);
  59  }
  60 }
  61
  62 static DECLFW(M187Write)
  63 {
  64 // FCEU_printf("Write: %04x:%04x (%04x,%d)\n",A,V,X.PC,scanline);
  65  LastWr=V;
  66  if(A==0x5000)
  67   ExtMode=V;
  68  Sync();
  69 }
  70
  71 static DECLFW(M187HWrite)
  72 {
  73 // FCEU_printf("Write: %04x:%04x (%04x,%d)\n",A,V,X.PC,scanline);
  74  //if(A==0x8003 && X.PC<0x800) FCEUI_DumpMem("dmp",0x0000,0xFFFF);
  75  //printf("$%04x:$%02x, %04x\n",A,V,X.PC);
  76  LastWr=V;
  77
  78  if(A==0x8003)
  79  {
  80 //  if(V==0x28 || V==0x2A)
  81    poofish=V;
  82  }
  83  else if(A==0x8000) poofish=0;
  84
  85  switch(A)
  86  {
  87   case 0xc000:IRQLatch=IRQCount=V;break;
  88   case 0xc001:IRQCount=IRQLatch;last=count=0;break;
  89   case 0xe000:IRQa=0;X6502_IRQEnd(FCEU_IQEXT);break;
  90   case 0xe001:IRQa=1;break;
  91   case 0xa000:MIRROR_SET(V&1);break;
  92
  93   case 0x8000:cmd=V;safe=1;break;
  94   case 0x8001:
  95               if(safe)
  96               {
  97                //printf("Cmd: %d, %02x, %04x\n",cmd&0x7,V,X.PC);
  98                DRegs[cmd&7]=V;
  99                Sync();
 100                safe=0;
 101               }
 102                 if(poofish==0x28)
 103                   setprg8(0xC000,0x17);
 104                 else if(poofish==0x2A)
 105                   setprg8(0xA000,0x0F);
 106               break;
 107
 108  }
 109 }
 110
 111 static DECLFR(ProtRead)
 112 {
 113  switch(LastWr&0x3)
 114  {
 115   case 0x1:
 116   case 0x0: return(0x83);
 117   case 0x2: return(0x42);
 118  }
 119  return(0);
 120 }
 121
 122 DECLFW(Write_IRQFM);
 123
 124 static void M187Power(void)
 125 {
 126  Write_IRQFM(0x4017,0x40);
 127  SetWriteHandler(0x5000,0x5fff,M187Write);
 128  SetWriteHandler(0x8000,0xFFFF,M187HWrite);
 129  SetReadHandler(0x5000,0x5FFF,ProtRead);
 130  SetWriteHandler(0x6000,0x7FFF,M187Write);
 131  SetReadHandler(0x8000,0xffff,CartBR);
 132  Sync();
 133 }
 134
 135 static void sl(void)
 136 {
 137  if(IRQa)
 138  {
 139   if(IRQCount>=0)
 140   {
 141    IRQCount--;
 142    if(IRQCount<0)
 143    {
 144     X6502_IRQBegin(FCEU_IQEXT);
 145    }
 146   }
 147  }
 148 }
 149
 150 static void FP_FASTAPASS(1) foo(uint32 A)
 151 {
 152  if((A&0x2000) && !(last&0x2000))
 153  {
 154   count++;
 155   if(count==42)
 156   {
 157    sl();
 158    count=0;
 159   }
 160  }
 161  last=A;
 162 }
 163
 164 void Mapper187_Init(CartInfo *info)
 165 {
 166  info->Power=M187Power;
 167 // GameHBIRQHook=sl;
 168  PPU_hook=foo;
 169 }
 170