merge mapper code from FCEUX

[fceu.git] / boards / 68.c

/* FCE Ultra - NES/Famicom Emulator\r
 *\r
 * Copyright notice for this file:\r
 *  Copyright (C) 2006 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
 */\r
\r
#include "mapinc.h"\r
\r
static uint8 chr_reg[4];\r
static uint8 kogame, prg_reg, nt1, nt2, mirr;\r
\r
static uint8 *WRAM=NULL;\r
static uint32 WRAMSIZE, count;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {&nt1, 1, "NT1"},\r
  {&nt2, 1, "NT2"},\r
  {&mirr, 1, "MIRR"},\r
  {&prg_reg, 1, "PRG"},\r
  {&kogame, 1, "KOGAME"},\r
  {&count, 4, "COUNT"},\r
  {chr_reg, 4, "CHR"},\r
  {0}\r
};\r
\r
static void M68NTfix(void)\r
{\r
  if((!UNIFchrrama)&&(mirr&0x10))\r
  {\r
    PPUNTARAM = 0;\r
    switch(mirr&3)\r
    {\r
     case 0: vnapage[0]=vnapage[2]=CHRptr[0]+(((nt1|128)&CHRmask1[0])<<10);\r
             vnapage[1]=vnapage[3]=CHRptr[0]+(((nt2|128)&CHRmask1[0])<<10);\r
             break;\r
     case 1: vnapage[0]=vnapage[1]=CHRptr[0]+(((nt1|128)&CHRmask1[0])<<10);\r
             vnapage[2]=vnapage[3]=CHRptr[0]+(((nt2|128)&CHRmask1[0])<<10);\r
             break;\r
     case 2: vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((nt1|128)&CHRmask1[0])<<10);\r
             break;\r
     case 3: vnapage[0]=vnapage[1]=vnapage[2]=vnapage[3]=CHRptr[0]+(((nt2|128)&CHRmask1[0])<<10);\r
             break;\r
    }\r
  }\r
  else\r
    switch(mirr&3)\r
    {\r
      case 0: setmirror(MI_V); break;\r
      case 1: setmirror(MI_H); break;\r
      case 2: setmirror(MI_0); break;\r
      case 3: setmirror(MI_1); break;\r
    }\r
}\r
\r
static void Sync(void)\r
{\r
  setchr2(0x0000,chr_reg[0]);\r
  setchr2(0x0800,chr_reg[1]);\r
  setchr2(0x1000,chr_reg[2]);\r
  setchr2(0x1800,chr_reg[3]);\r
  setprg8r(0x10,0x6000,0);\r
  setprg16r((PRGptr[1])?kogame:0,0x8000,prg_reg);\r
  setprg16(0xC000,~0);\r
}\r
\r
static DECLFR(M68Read)\r
{\r
  if(!(kogame&8))\r
  {\r
    count++;\r
    if(count==1784)\r
      setprg16r(0,0x8000,prg_reg);\r
  }\r
  return CartBR(A);\r
}\r
\r
static DECLFW(M68WriteLo)\r
{\r
  if(!V)\r
  { \r
    count = 0;\r
    setprg16r((PRGptr[1])?kogame:0,0x8000,prg_reg);\r
  }\r
}\r
\r
static DECLFW(M68WriteCHR)\r
{\r
  chr_reg[(A>>12)&3]=V;\r
  Sync();\r
}\r
\r
static DECLFW(M68WriteNT1)\r
{\r
  nt1 = V;            \r
  M68NTfix();\r
}\r
\r
static DECLFW(M68WriteNT2)\r
{\r
  nt2 = V;            \r
  M68NTfix();\r
}\r
\r
static DECLFW(M68WriteMIR)\r
{\r
  mirr = V;\r
  M68NTfix();\r
}\r
\r
static DECLFW(M68WriteROM)\r
{\r
  prg_reg = V&7;\r
  kogame = ((V>>3)&1)^1;\r
  Sync();\r
}\r
\r
static void M68Power(void)\r
{\r
  prg_reg = 0;\r
  kogame = 0;\r
  Sync();\r
  M68NTfix();\r
  SetReadHandler(0x6000,0x7FFF,CartBR);\r
  SetReadHandler(0x8000,0xBFFF,M68Read);\r
  SetReadHandler(0xC000,0xFFFF,CartBR);\r
  SetWriteHandler(0x8000,0xBFFF,M68WriteCHR);\r
  SetWriteHandler(0xC000,0xCFFF,M68WriteNT1);\r
  SetWriteHandler(0xD000,0xDFFF,M68WriteNT2);\r
  SetWriteHandler(0xE000,0xEFFF,M68WriteMIR);\r
  SetWriteHandler(0xF000,0xFFFF,M68WriteROM);\r
  SetWriteHandler(0x6000,0x6000,M68WriteLo);\r
  SetWriteHandler(0x6001,0x7FFF,CartBW);\r
}\r
\r
static void M68Close(void)\r
{\r
  if(WRAM)\r
    FCEU_gfree(WRAM);\r
  WRAM=NULL;\r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
  M68NTfix();\r
}\r
\r
void Mapper68_Init(CartInfo *info)\r
{\r
  info->Power=M68Power;\r
  info->Close=M68Close;\r
  GameStateRestore=StateRestore;\r
  WRAMSIZE=8192;\r
  WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);\r
  SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);\r
  if(info->battery)\r
  {\r
    info->SaveGame[0]=WRAM;\r
    info->SaveGameLen[0]=WRAMSIZE;\r
  }\r
  AddExState(WRAM, WRAMSIZE, 0, "WRAM");\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r