merge mappers from FCEU-mm

[fceu.git] / boards / 17.c

/* FCE Ultra - NES/Famicom Emulator\r
 *\r
 * Copyright notice for this file:\r
 *  Copyright (C) 2012 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
 * FFE Copier Mapper\r
 *\r
 */\r
\r
#include "mapinc.h"\r
\r
static uint8 preg[4], creg[8];\r
static uint8 IRQa, mirr;\r
static int32 IRQCount, IRQLatch;\r
\r
static SFORMAT StateRegs[]=\r
{\r
  {preg, 4, "PREG"},\r
  {creg, 8, "CREG"},\r
  {&mirr, 1, "MIRR"},\r
  {&IRQa, 1, "IRQA"},\r
  {&IRQCount, 4, "IRQC"},\r
  {&IRQLatch, 4, "IRQL"},\r
  {0}\r
};\r
\r
static void Sync(void)\r
{\r
  int i;\r
  for(i=0; i<8; i++) setchr1(i<<10,creg[i]);\r
  setprg8(0x8000,preg[0]);\r
  setprg8(0xA000,preg[1]);\r
  setprg8(0xC000,preg[2]);\r
  setprg8(0xE000,preg[3]);\r
  switch(mirr) {\r
    case 0: setmirror(MI_0); break;\r
    case 1: setmirror(MI_1); break;\r
    case 2: setmirror(MI_H); break;\r
    case 3: setmirror(MI_V); break;\r
  }\r
}\r
\r
static DECLFW(M17WriteMirr)\r
{\r
  mirr = ((A << 1) & 2)|((V >> 4) & 1);\r
  Sync();\r
}\r
\r
static DECLFW(M17WriteIRQ)\r
{\r
  switch(A) {\r
    case 0x4501: IRQa=0; X6502_IRQEnd(FCEU_IQEXT); break;\r
    case 0x4502: IRQCount&=0xFF00; IRQCount|=V; break;\r
    case 0x4503: IRQCount&=0x00FF; IRQCount|=V<<8; IRQa=1; break;\r
  }\r
}\r
\r
static DECLFW(M17WritePrg)\r
{\r
  preg[A & 3] = V;\r
  Sync();\r
}\r
\r
static DECLFW(M17WriteChr)\r
{\r
  creg[A & 7] = V;\r
  Sync();\r
}\r
\r
static void M17Power(void)\r
{\r
  preg[3] = ~0;\r
  Sync();\r
  SetReadHandler(0x8000,0xFFFF,CartBR);\r
  SetWriteHandler(0x42FE,0x42FF,M17WriteMirr);\r
  SetWriteHandler(0x4500,0x4503,M17WriteIRQ);\r
  SetWriteHandler(0x4504,0x4507,M17WritePrg);\r
  SetWriteHandler(0x4510,0x4517,M17WriteChr);\r
}\r
\r
static void FP_FASTAPASS(1) M17IRQHook(int a)\r
{\r
  if(IRQa)\r
  {\r
    IRQCount+=a;\r
    if(IRQCount>=0x10000)\r
    {\r
      X6502_IRQBegin(FCEU_IQEXT);\r
      IRQa=0;\r
      IRQCount=0;\r
    }\r
  }\r
}\r
\r
static void StateRestore(int version)\r
{\r
  Sync();\r
}\r
\r
void Mapper17_Init(CartInfo *info)\r
{\r
  info->Power=M17Power;\r
  GameHBIRQHook=M17IRQHook;\r
  GameStateRestore=StateRestore;\r
\r
  AddExState(&StateRegs, ~0, 0, 0);\r
}\r
\r