merge mapper code from FCEUX

[fceu.git] / boards / sl1632.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
// brk is a system call in *nix, and is an illegal variable name - soules\r
static uint8 chrcmd[8], prg0, prg1, bbrk, mirr, swap;\r
static SFORMAT StateRegs[]=\r
{\r
  {chrcmd, 8, "CHRCMD"},\r
  {&prg0, 1, "PRG0"},\r
  {&prg1, 1, "PRG1"},\r
  {&bbrk, 1, "BRK"},\r
  {&mirr, 1, "MIRR"},\r
  {&swap, 1, "SWAP"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  int i;\r
  setprg8(0x8000,prg0);\r
  setprg8(0xA000,prg1);\r
  setprg8(0xC000,~1);\r
  setprg8(0xE000,~0);\r
  for(i=0; i<8; i++)\r
     setchr1(i<<10,chrcmd[i]);\r
  setmirror(mirr^1);\r
}\r
\r
static void UNLSL1632CW(uint32 A, uint8 V)\r
{\r
  int cbase=(MMC3_cmd&0x80)<<5;\r
  int page0=(bbrk&0x08)<<5;\r
  int page1=(bbrk&0x20)<<3;\r
  int page2=(bbrk&0x80)<<1;\r
  setchr1(cbase^0x0000,page0|(DRegBuf[0]&(~1)));\r
  setchr1(cbase^0x0400,page0|DRegBuf[0]|1);\r
  setchr1(cbase^0x0800,page0|(DRegBuf[1]&(~1)));\r
  setchr1(cbase^0x0C00,page0|DRegBuf[1]|1);\r
  setchr1(cbase^0x1000,page1|DRegBuf[2]);\r
  setchr1(cbase^0x1400,page1|DRegBuf[3]);\r
  setchr1(cbase^0x1800,page2|DRegBuf[4]);\r
  setchr1(cbase^0x1c00,page2|DRegBuf[5]);\r
}\r
\r
static DECLFW(UNLSL1632CMDWrite)\r
{\r
  if(A==0xA131)\r
  {\r
    bbrk=V;\r
  }\r
  if(bbrk&2)\r
  {\r
    FixMMC3PRG(MMC3_cmd);\r
    FixMMC3CHR(MMC3_cmd);\r
    if(A<0xC000)\r
      MMC3_CMDWrite(A,V);\r
    else\r
      MMC3_IRQWrite(A,V);\r
  }\r
  else\r
  {\r
    if((A>=0xB000)&&(A<=0xE003))\r
    {\r
      int ind=((((A&2)|(A>>10))>>1)+2)&7;\r
      int sar=((A&1)<<2);\r
      chrcmd[ind]=(chrcmd[ind]&(0xF0>>sar))|((V&0x0F)<<sar);\r
    }\r
    else\r
      switch(A&0xF003)\r
      {\r
        case 0x8000: prg0=V; break;\r
        case 0xA000: prg1=V; break;\r
        case 0x9000: mirr=V&1; break;\r
      }\r
    Sync();\r
  }\r
}\r
\r
static void StateRestore(int version)\r
{\r
  if(bbrk&2)\r
  {\r
    FixMMC3PRG(MMC3_cmd);\r
    FixMMC3CHR(MMC3_cmd);\r
  }\r
  else\r
    Sync();\r
}\r
\r
static void UNLSL1632Power(void)\r
{\r
  GenMMC3Power();\r
  SetReadHandler(0x8000,0xFFFF,CartBR);\r
  SetWriteHandler(0x4100,0xFFFF,UNLSL1632CMDWrite);\r
}\r
\r
void UNLSL1632_Init(CartInfo *info)\r
{\r
  GenMMC3_Init(info, 256, 512, 0, 0);\r
  cwrap=UNLSL1632CW;\r
  info->Power=UNLSL1632Power;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r