X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=fceu.git;a=blobdiff_plain;f=boards%2F17.c;fp=boards%2F17.c;h=a08caaae776b68deff086a1529ab362938a8f8fb;hp=0000000000000000000000000000000000000000;hb=43725da7349c85fa13e828fdbf20cc7ac8d298d6;hpb=386f5371eb984fb9c2860c83e740890a75cd45c1

diff --git a/boards/17.c b/boards/17.c
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+++ b/boards/17.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
+ *
+ * FFE Copier Mapper
+ *
+ */
+
+#include "mapinc.h"
+
+static uint8 preg[4], creg[8];
+static uint8 IRQa, mirr;
+static int32 IRQCount, IRQLatch;
+
+static SFORMAT StateRegs[]=
+{
+  {preg, 4, "PREG"},
+  {creg, 8, "CREG"},
+  {&mirr, 1, "MIRR"},
+  {&IRQa, 1, "IRQA"},
+  {&IRQCount, 4, "IRQC"},
+  {&IRQLatch, 4, "IRQL"},
+  {0}
+};
+
+static void Sync(void)
+{
+  int i;
+  for(i=0; i<8; i++) setchr1(i<<10,creg[i]);
+  setprg8(0x8000,preg[0]);
+  setprg8(0xA000,preg[1]);
+  setprg8(0xC000,preg[2]);
+  setprg8(0xE000,preg[3]);
+  switch(mirr) {
+    case 0: setmirror(MI_0); break;
+    case 1: setmirror(MI_1); break;
+    case 2: setmirror(MI_H); break;
+    case 3: setmirror(MI_V); break;
+  }
+}
+
+static DECLFW(M17WriteMirr)
+{
+  mirr = ((A << 1) & 2)|((V >> 4) & 1);
+  Sync();
+}
+
+static DECLFW(M17WriteIRQ)
+{
+  switch(A) {
+    case 0x4501: IRQa=0; X6502_IRQEnd(FCEU_IQEXT); break;
+    case 0x4502: IRQCount&=0xFF00; IRQCount|=V; break;
+    case 0x4503: IRQCount&=0x00FF; IRQCount|=V<<8; IRQa=1; break;
+  }
+}
+
+static DECLFW(M17WritePrg)
+{
+  preg[A & 3] = V;
+  Sync();
+}
+
+static DECLFW(M17WriteChr)
+{
+  creg[A & 7] = V;
+  Sync();
+}
+
+static void M17Power(void)
+{
+  preg[3] = ~0;
+  Sync();
+  SetReadHandler(0x8000,0xFFFF,CartBR);
+  SetWriteHandler(0x42FE,0x42FF,M17WriteMirr);
+  SetWriteHandler(0x4500,0x4503,M17WriteIRQ);
+  SetWriteHandler(0x4504,0x4507,M17WritePrg);
+  SetWriteHandler(0x4510,0x4517,M17WriteChr);
+}
+
+static void FP_FASTAPASS(1) M17IRQHook(int a)
+{
+  if(IRQa)
+  {
+    IRQCount+=a;
+    if(IRQCount>=0x10000)
+    {
+      X6502_IRQBegin(FCEU_IQEXT);
+      IRQa=0;
+      IRQCount=0;
+    }
+  }
+}
+
+static void StateRestore(int version)
+{
+  Sync();
+}
+
+void Mapper17_Init(CartInfo *info)
+{
+  info->Power=M17Power;
+  GameHBIRQHook=M17IRQHook;
+  GameStateRestore=StateRestore;
+
+  AddExState(&StateRegs, ~0, 0, 0);
+}
+