X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=mappers%2F50.c;fp=mappers%2F50.c;h=8d7f515fea476ae7c8ddc94fc2ce12dbd8118ab3;hb=d97315ac0bca825d2d50a44453bc5652946e2c67;hp=0000000000000000000000000000000000000000;hpb=890e37ba2b8ea1c7593dc05926d7431e3bd00bfb;p=fceu.git

diff --git a/mappers/50.c b/mappers/50.c
new file mode 100644
index 0000000..8d7f515
--- /dev/null
+++ b/mappers/50.c
@@ -0,0 +1,75 @@
+/* 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 void FP_FASTAPASS(1) Mapper50IRQ(int a)
+{
+ if(IRQa)
+ {
+        if(IRQCount<4096)
+         IRQCount+=a;
+        else
+        {
+         IRQa=0;
+         X6502_IRQBegin(FCEU_IQEXT);
+        }
+ }
+}
+
+static void M50Restore(int version)
+{
+ setprg8(0xc000,mapbyte1[0]);
+}
+
+static DECLFW(M50W)
+{
+ if((A&0xD060)==0x4020)
+ {
+  if(A&0x100)
+  {
+   IRQa=V&1;
+   if(!IRQa) IRQCount=0;
+   X6502_IRQEnd(FCEU_IQEXT);
+  }
+  else
+  {
+   V=((V&1)<<2)|((V&2)>>1)|((V&4)>>1)|(V&8);
+   mapbyte1[0]=V;
+   setprg8(0xc000,V);
+  }
+ }
+}
+
+void Mapper50_init(void)
+{
+  SetWriteHandler(0x4020,0x5fff,M50W);
+  SetReadHandler(0x6000,0xffff,CartBR);
+  MapStateRestore=M50Restore;
+  MapIRQHook=Mapper50IRQ;
+
+  setprg8(0x6000,0xF);
+  setprg8(0x8000,0x8);
+  setprg8(0xa000,0x9);
+  setprg8(0xc000,0x0);
+  setprg8(0xe000,0xB);
+}
+