X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=fceu.git;a=blobdiff_plain;f=boards%2F91.c;fp=boards%2F91.c;h=0fed9df6602fd75d39c012be22d5642038b3e928;hp=0000000000000000000000000000000000000000;hb=43725da7349c85fa13e828fdbf20cc7ac8d298d6;hpb=386f5371eb984fb9c2860c83e740890a75cd45c1

diff --git a/boards/91.c b/boards/91.c
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+++ b/boards/91.c
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+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2012 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "mapinc.h"
+
+static uint8 cregs[4], pregs[2];
+static uint8 IRQCount, IRQa;
+
+static SFORMAT StateRegs[]=
+{
+  {cregs, 4, "CREG"},
+  {pregs, 2, "PREG"},
+  {&IRQa, 1, "IRQA"},
+  {&IRQCount, 1, "IRQC"},
+  {0}
+};
+
+static void Sync(void)
+{
+  setprg8(0x8000,pregs[0]);
+  setprg8(0xa000,pregs[1]);
+  setprg8(0xc000,~1);
+  setprg8(0xe000,~0);
+  setchr2(0x0000,cregs[0]);
+  setchr2(0x0800,cregs[1]);
+  setchr2(0x1000,cregs[2]);
+  setchr2(0x1800,cregs[3]);
+}
+
+static DECLFW(M91Write0)
+{
+  cregs[A & 3] = V;
+  Sync();
+}
+
+static DECLFW(M91Write1)
+{
+  switch (A & 3)
+  {
+    case 0:
+    case 1: pregs[A & 1] = V; Sync(); break;
+    case 2: IRQa = IRQCount = 0; X6502_IRQEnd(FCEU_IQEXT); break;
+    case 3: IRQa = 1; X6502_IRQEnd(FCEU_IQEXT); break;
+  }
+}
+
+static void M91Power(void)
+{
+  Sync();
+  SetWriteHandler(0x6000,0x6fff,M91Write0);
+  SetWriteHandler(0x7000,0x7fff,M91Write1);
+  SetReadHandler(0x8000,0xffff,CartBR);
+}
+
+static void M91IRQHook(void)
+{
+  if(IRQCount<8 && IRQa)
+  {
+    IRQCount++;
+    if(IRQCount>=8)
+    {
+      X6502_IRQBegin(FCEU_IQEXT);   
+    } 
+  }
+}
+
+static void StateRestore(int version)
+{
+  Sync();
+}
+
+void Mapper91_Init(CartInfo *info)
+{
+  info->Power=M91Power;
+  GameHBIRQHook=M91IRQHook;
+  GameStateRestore=StateRestore;
+  AddExState(&StateRegs, ~0, 0, 0);
+}