merge mapper code from FCEUX

[fceu.git] / boards / 187.c

/* FCE Ultra - NES/Famicom Emulator\r
 *\r
 * Copyright notice for this file:\r
 *  Copyright (C) 2005 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
#include "mmc3.h"\r
\r
static void M187CW(uint32 A, uint8 V)\r
{\r
  if((A&0x1000)==((MMC3_cmd&0x80)<<5))\r
    setchr1(A,V|0x100);\r
  else\r
    setchr1(A,V);\r
}\r
\r
static void M187PW(uint32 A, uint8 V)\r
{\r
  if(EXPREGS[0]&0x80)\r
  {\r
    uint8 bank=EXPREGS[0]&0x1F;\r
    if(EXPREGS[0]&0x20)\r
      setprg32(0x8000,bank>>2);\r
    else\r
    {\r
      setprg16(0x8000,bank);\r
      setprg16(0xC000,bank);\r
    }\r
  }\r
  else\r
    setprg8(A,V&0x3F);\r
}\r
\r
static DECLFW(M187Write8000)\r
{\r
  EXPREGS[2]=1;\r
  MMC3_CMDWrite(A,V);\r
}\r
\r
static DECLFW(M187Write8001)\r
{\r
  if(EXPREGS[2])\r
    MMC3_CMDWrite(A,V);\r
}\r
\r
static DECLFW(M187Write8003)\r
{\r
  EXPREGS[2]=0;\r
  if(V==0x28)setprg8(0xC000,0x17);\r
  else if(V==0x2A)setprg8(0xA000,0x0F);\r
}\r
\r
\r
static DECLFW(M187WriteLo)\r
{\r
  EXPREGS[1]=V;\r
  if(A==0x5000)\r
  {\r
    EXPREGS[0]=V;\r
    FixMMC3PRG(MMC3_cmd);\r
  }\r
}\r
\r
static uint8 prot_data[4] = { 0x83, 0x83, 0x42, 0x00 };\r
static DECLFR(M187Read)\r
{\r
  return prot_data[EXPREGS[1]&3];\r
}\r
\r
static void M187Power(void)\r
{\r
  EXPREGS[0]=EXPREGS[1]=EXPREGS[2]=0;\r
  GenMMC3Power();\r
  SetReadHandler(0x5000,0x5FFF,M187Read);\r
  SetWriteHandler(0x5000,0x5FFF,M187WriteLo);\r
  SetWriteHandler(0x8000,0x8000,M187Write8000);\r
  SetWriteHandler(0x8001,0x8001,M187Write8001);\r
  SetWriteHandler(0x8003,0x8003,M187Write8003);\r
}\r
\r
void Mapper187_Init(CartInfo *info)\r
{\r
  GenMMC3_Init(info, 256, 256, 0, 0);\r
  pwrap=M187PW;\r
  cwrap=M187CW;\r
  info->Power=M187Power;\r
  AddExState(EXPREGS, 3, 0, "EXPR");\r
}\r