boards/164.c

   1 /* FCE Ultra - NES/Famicom Emulator
   2  *
   3  * Copyright notice for this file:
   4  *  Copyright (C) 2002 Xodnizel 2006 CaH4e3
   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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  19  */
  20
  21 #include "mapinc.h"
  22
  23 static uint8 cmd, laststrobe, trigger;
  24 static uint8 DRegs[8];
  25 static SFORMAT StateRegs[]=
  26 {
  27   {&cmd, 1, "CMD"},
  28   {&laststrobe, 1, "STB"},
  29   {&trigger, 1, "TRG"},
  30   {DRegs, 8, "DREG"},
  31   {0}
  32 };
  33
  34 static void Sync(void)
  35 {
  36   setprg32(0x8000,(DRegs[0]<<4)|(DRegs[1]&0xF));
  37 }
  38
  39 static void StateRestore(int version)
  40 {
  41   Sync();
  42 }
  43
  44 static DECLFR(ReadLow)
  45 {
  46   switch (A&0x7700)
  47   {
  48     case 0x5100: return DRegs[2]; break;
  49     case 0x5500: if(trigger)
  50                    return DRegs[2];
  51                  else
  52                    return 0;
  53   }
  54   return 4;
  55 }
  56
  57 static DECLFW(Write)
  58 {
  59   switch (A&0x7300)
  60   {
  61     case 0x5100: DRegs[0]=V; Sync(); break;
  62     case 0x5000: DRegs[1]=V; Sync(); break;
  63     case 0x5300: DRegs[2]=V; break;
  64   }
  65 }
  66
  67 static DECLFW(Write2)
  68 {
  69   if(A==0x5101)
  70   {
  71     if(laststrobe&&!V)
  72     {
  73       trigger^=1;
  74     }
  75     laststrobe=V;
  76   }else if(A==0x5100&&V==6) //damn thoose protected games
  77     setprg32(0x8000,3);
  78   else
  79   switch (A&0x7300)
  80   {
  81     case 0x5200: DRegs[0]=V; Sync(); break;
  82     case 0x5000: DRegs[1]=V; Sync(); if(!(DRegs[1]&0x80)&&(scanline<128)) setchr8(0); break;
  83     case 0x5300: DRegs[2]=V; break;
  84   }
  85 }
  86
  87 static uint8 WRAM[8192];
  88 static DECLFR(AWRAM)
  89 {
  90   return(WRAM[A-0x6000]);
  91 }
  92
  93 static DECLFW(BWRAM)
  94 {
  95   WRAM[A-0x6000]=V;
  96 }
  97
  98 static void Power(void)
  99 {
 100   memset(DRegs,0,8);
 101   DRegs[1]=0xFF;
 102   cmd=0;
 103   SetReadHandler(0x8000,0xFFFF,CartBR);
 104   SetWriteHandler(0x4020,0x5FFF,Write);
 105   SetReadHandler(0x6000,0x7FFF,AWRAM);
 106   SetWriteHandler(0x6000,0x7FFF,BWRAM);
 107   setchr8(0);
 108   Sync();
 109 }
 110
 111 static void M163HB(void)
 112 {
 113     if(DRegs[1]&0x80)
 114     {
 115       if(scanline==239)
 116       {
 117         setchr4(0x0000,0);
 118         setchr4(0x1000,0);
 119       }
 120       else if(scanline==127)
 121       {
 122         setchr4(0x0000,1);
 123         setchr4(0x1000,1);
 124       }
 125     }
 126 }
 127
 128 static void Power2(void)
 129 {
 130   memset(DRegs,0,8);
 131   DRegs[1]=0xFF;
 132   laststrobe=1;
 133   cmd=0;
 134   SetReadHandler(0x8000,0xFFFF,CartBR);
 135   SetWriteHandler(0x4020,0x5FFF,Write2);
 136   SetReadHandler(0x6000,0x7FFF,AWRAM);
 137   SetWriteHandler(0x6000,0x7FFF,BWRAM);
 138   SetReadHandler(0x5000,0x5FFF,ReadLow);
 139   setchr8(0);
 140   Sync();
 141 }
 142
 143 void Mapper164_Init(CartInfo *info)
 144 {
 145   info->Power=Power;
 146   GameStateRestore=StateRestore;
 147   AddExState(&StateRegs, ~0, 0, 0);
 148   AddExState(WRAM, 8192, 0, "WRAM");
 149   info->SaveGame[0]=WRAM;\r
 150   info->SaveGameLen[0]=8192;
 151 }
 152
 153 void Mapper163_Init(CartInfo *info)
 154 {
 155   info->Power=Power2;
 156   GameHBIRQHook=M163HB;
 157   GameStateRestore=StateRestore;
 158   AddExState(&StateRegs, ~0, 0, 0);
 159   AddExState(WRAM, 8192, 0, "WRAM");
 160 }