merge mappers from FCEU-mm

[fceu.git] / boards / tf-1201.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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
 *\r
 * Lethal Weapon (VRC4 mapper)\r
 */\r
\r
#include "mapinc.h"\r
\r
static uint8 prg0, prg1, mirr, swap;\r
static uint8 chr[8];\r
static uint8 IRQCount;           \r
static uint8 IRQPre;\r
static uint8 IRQa;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {&prg0, 1, "PRG0"},\r
  {&prg0, 1, "PRG1"},\r
  {&mirr, 1, "MIRR"},\r
  {&swap, 1, "SWAP"},\r
  {chr, 8, "CHR"},\r
  {&IRQCount, 1, "IRQC"},\r
  {&IRQPre, 1, "IRQP"},\r
  {&IRQa, 1, "IRQA"},\r
  {0}\r
};\r
\r
static void SyncPrg(void)\r
{\r
  if(swap&3)\r
  {\r
    setprg8(0x8000,~1);\r
    setprg8(0xC000,prg0);\r
  }  \r
  else\r
  {\r
    setprg8(0x8000,prg0);\r
    setprg8(0xC000,~1);\r
  }\r
  setprg8(0xA000,prg1);\r
  setprg8(0xE000,~0);\r
}\r
\r
static void SyncChr(void)\r
{\r
  int i;\r
  for(i=0; i<8; i++)\r
     setchr1(i<<10,chr[i]);\r
  setmirror(mirr^1);\r
}\r
\r
static void StateRestore(int version)\r
{\r
  SyncPrg();\r
  SyncChr();\r
}\r
\r
static DECLFW(UNLTF1201Write)\r
{\r
  A=(A&0xF003)|((A&0xC)>>2);\r
  if((A>=0xB000)&&(A<=0xE003))\r
  {\r
    int ind=(((A>>11)-6)|(A&1))&7;\r
    int sar=((A&2)<<1);\r
    chr[ind]=(chr[ind]&(0xF0>>sar))|((V&0x0F)<<sar);\r
    SyncChr();\r
  }\r
  else switch (A&0xF003)\r
  {\r
    case 0x8000: prg0=V; SyncPrg(); break;\r
    case 0xA000: prg1=V; SyncPrg(); break;\r
    case 0x9000: mirr=V&1; SyncChr(); break;\r
    case 0x9001: swap=V&3; SyncPrg(); break;\r
    case 0xF000: IRQCount=((IRQCount&0xF0)|(V&0xF)); break;\r
    case 0xF002: IRQCount=((IRQCount&0x0F)|((V&0xF)<<4)); break;\r
    case 0xF001: \r
    case 0xF003: IRQa=V&2; X6502_IRQEnd(FCEU_IQEXT); if(scanline<240) IRQCount-=8; break;\r
  }\r
}\r
  \r
static void UNLTF1201IRQCounter(void)\r
{\r
  if(IRQa)\r
  {\r
    IRQCount++;\r
    if(IRQCount==237)\r
    {\r
      X6502_IRQBegin(FCEU_IQEXT);\r
    }\r
  }\r
}\r
  \r
static void UNLTF1201Power(void)\r
{\r
  IRQPre=IRQCount=IRQa=0;\r
  SetReadHandler(0x8000,0xFFFF,CartBR);\r
  SetWriteHandler(0x8000,0xFFFF,UNLTF1201Write);\r
  SyncPrg();\r
  SyncChr();\r
}\r
\r
void UNLTF1201_Init(CartInfo *info)\r
{\r
  info->Power=UNLTF1201Power;\r
  GameHBIRQHook=UNLTF1201IRQCounter;\r
  GameStateRestore=StateRestore;\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r