X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=fceu.git;a=blobdiff_plain;f=boards%2F253.c;fp=boards%2F253.c;h=6e3b5692fd6ce1dc2c9e7393f6dc258a7275752a;hp=0000000000000000000000000000000000000000;hb=386f5371eb984fb9c2860c83e740890a75cd45c1;hpb=eec2623f6183dd0f9494b99065a16bf90f2a1ccf

diff --git a/boards/253.c b/boards/253.c
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+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2009 CaH4e3
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include "mapinc.h"
+
+static uint8 chrlo[8], chrhi[8], prg[2], mirr, vlock;
+static int32 IRQa, IRQCount, IRQLatch, IRQClock; 
+static uint8 *WRAM=NULL;
+static uint32 WRAMSIZE;
+static uint8 *CHRRAM=NULL;
+static uint32 CHRRAMSIZE;
+
+static SFORMAT StateRegs[]=
+{
+  {chrlo, 8, "CHRLO"},
+  {chrhi, 8, "CHRHI"},
+  {prg, 2, "PRGR"},
+  {&mirr, 1, "MIRR"},
+  {&vlock, 1, "VLOCK"},
+  {&IRQa, 4, "IRQA"},
+  {&IRQCount, 4, "IRQC"},
+  {&IRQLatch, 4, "IRQL"},
+  {&IRQClock, 4, "IRQK"},
+  {0}
+};
+
+static void Sync(void)
+{
+  uint8 i;
+  setprg8r(0x10,0x6000,0);
+  setprg8(0x8000,prg[0]);
+  setprg8(0xa000,prg[1]);
+  setprg8(0xc000,~1);
+  setprg8(0xe000,~0);
+  for(i=0; i<8; i++)
+  {
+    uint32 chr = chrlo[i]|(chrhi[i]<<8);
+    if(chrlo[i]==0xc8)
+    {
+      vlock = 0;
+      continue;
+    }
+    else if(chrlo[i]==0x88)
+    {
+      vlock = 1;
+      continue;
+    }
+    if(((chrlo[i]==4)||(chrlo[i]==5))&&!vlock)
+      setchr1r(0x10,i<<10,chr&1);
+    else
+      setchr1(i<<10,chr);
+  }
+  switch(mirr)
+  {
+    case 0: setmirror(MI_V); break;
+    case 1: setmirror(MI_H); break;
+    case 2: setmirror(MI_0); break;
+    case 3: setmirror(MI_1); break;
+  }
+}
+
+static DECLFW(M253Write)
+{
+  if((A>=0xB000)&&(A<=0xE00C))
+  {
+    uint8 ind=((((A&8)|(A>>8))>>3)+2)&7;
+    uint8 sar=A&4;
+    chrlo[ind]=(chrlo[ind]&(0xF0>>sar))|((V&0x0F)<<sar);
+    if(A&4)
+      chrhi[ind]=V>>4;
+    Sync();
+  }
+  else
+   switch(A)
+    {
+      case 0x8010: prg[0]=V; Sync(); break;
+      case 0xA010: prg[1]=V; Sync(); break;
+      case 0x9400: mirr=V&3; Sync(); break;
+      case 0xF000: IRQLatch = (IRQLatch & 0xF0) | (V & 0x0F); break;
+      case 0xF004: IRQLatch = (IRQLatch & 0x0F) | (V << 4); break;
+      case 0xF008:
+        IRQa = V&3;
+        if(IRQa&2)
+        {
+          IRQCount = IRQLatch;
+          IRQClock = 0;
+        }
+        X6502_IRQEnd(FCEU_IQEXT);
+        break;
+    }
+}
+
+static void M253Power(void)
+{
+  Sync();
+  SetReadHandler(0x6000,0x7FFF,CartBR);
+  SetWriteHandler(0x6000,0x7FFF,CartBW);
+  SetReadHandler(0x8000,0xFFFF,CartBR);
+  SetWriteHandler(0x8000,0xFFFF,M253Write);
+}
+
+static void M253Close(void)
+{
+  if(WRAM)
+    FCEU_gfree(WRAM);
+  if(CHRRAM)
+    FCEU_gfree(CHRRAM);
+  WRAM=CHRRAM=NULL;
+}
+
+static void M253IRQ(int cycles)
+{
+  if(IRQa&2) 
+  {
+    if((IRQClock+=cycles)>=0x72) 
+    {
+      IRQClock -= 0x72;
+      if(IRQCount==0xFF)  
+      {
+        IRQCount = IRQLatch;
+        IRQa = IRQa|((IRQa&1)<<1);
+        X6502_IRQBegin(FCEU_IQEXT);
+      }
+      else 
+        IRQCount++;
+    }
+  }
+}
+
+static void StateRestore(int version)
+{
+  Sync();
+}
+
+void Mapper253_Init(CartInfo *info)
+{
+  info->Power=M253Power;
+  info->Close=M253Close;
+  MapIRQHook=M253IRQ;
+  GameStateRestore=StateRestore;
+
+  CHRRAMSIZE=4096;
+  CHRRAM=(uint8*)FCEU_gmalloc(CHRRAMSIZE);
+  SetupCartCHRMapping(0x10,CHRRAM,CHRRAMSIZE,1);
+  AddExState(CHRRAM, CHRRAMSIZE, 0, "CRAM");
+
+  WRAMSIZE=8192;
+  WRAM=(uint8*)FCEU_gmalloc(WRAMSIZE);
+  SetupCartPRGMapping(0x10,WRAM,WRAMSIZE,1);
+  AddExState(WRAM, WRAMSIZE, 0, "WRAM");
+  if(info->battery)
+  {
+    info->SaveGame[0]=WRAM;
+    info->SaveGameLen[0]=WRAMSIZE;
+  }
+
+  AddExState(&StateRegs, ~0, 0, 0);
+}