mappers updated to 0.98.16

[fceu.git] / boards / 117.c

diff --git a/boards/117.c b/boards/117.c
new file mode 100644 (file)
index 0000000..6746015
--- /dev/null
+++ b/boards/117.c
@@ -0,0 +1,101 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2002 Xodnizel
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "mapinc.h"
+
+static uint8 prgreg[4], chrreg[8];
+static uint8 IRQa, IRQCount, IRQLatch;
+
+static SFORMAT StateRegs[]=
+{
+  {&IRQa, 1, "IRQA"},
+  {&IRQCount, 1, "IRQC"},
+  {&IRQLatch, 1, "IRQL"},
+  {prgreg, 4, "PREGS"},
+  {chrreg, 8, "CREGS"},
+  {0}
+};
+
+static void Sync(void)
+{
+  setprg8(0x8000,prgreg[0]);     
+  setprg8(0xa000,prgreg[1]);     
+  setprg8(0xc000,prgreg[2]);     
+  setprg8(0xe000,prgreg[3]);
+  int i;
+  for(i=0; i<8; i++)
+     setchr1(i<<10,chrreg[i]);     
+}
+
+static DECLFW(M117Write)
+{
+  if(A<0x8004)
+  {
+    prgreg[A&3]=V;
+    Sync();
+  }  
+  else if((A>=0xA000)&&(A<=0xA007))
+  {
+    chrreg[A&7]=V;
+    Sync();
+  }
+  else switch(A)
+       {
+         case 0xc001: IRQLatch=V; break;
+         case 0xc003: IRQCount=IRQLatch; IRQa|=2; break;
+         case 0xe000: IRQa&=~1; IRQa|=V&1; X6502_IRQEnd(FCEU_IQEXT); break;
+         case 0xc002: X6502_IRQEnd(FCEU_IQEXT); break;
+       }
+}
+
+static void M117Power(void)
+{
+  prgreg[0]=~3; prgreg[1]=~2; prgreg[2]=~1; prgreg[3]=~0;
+  Sync();
+  SetReadHandler(0x8000,0xFFFF,CartBR);
+  SetWriteHandler(0x8000,0xFFFF,M117Write);
+}
+
+static void M117IRQHook(void)
+{
+  if(IRQa==3&&IRQCount)
+  {
+    IRQCount--;
+    if(!IRQCount)
+    {
+      IRQa&=1;
+      X6502_IRQBegin(FCEU_IQEXT);
+    }
+  }
+}
+
+static void StateRestore(int version)
+{
+  Sync();
+}
+
+void Mapper117_Init(CartInfo *info)
+{
+  info->Power=M117Power;
+  GameHBIRQHook=M117IRQHook;
+  GameStateRestore=StateRestore;
+  AddExState(&StateRegs, ~0, 0, 0);
+}
+