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diff --git a/boards/603-5052.c b/boards/603-5052.c
new file mode 100644
index 0000000..43b4e0a
--- /dev/null
+++ b/boards/603-5052.c
@@ -0,0 +1,48 @@
+/* FCE Ultra - NES/Famicom Emulator
+ *
+ * Copyright notice for this file:
+ *  Copyright (C) 2005 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"
+#include "mmc3.h"
+
+static uint8 lut[4] = { 0x00, 0x02, 0x02, 0x03 };
+
+static DECLFW(UNL6035052ProtWrite)
+{
+  EXPREGS[0]=lut[V&3];  
+}
+
+static DECLFR(UNL6035052ProtRead)
+{
+  return EXPREGS[0];
+}
+
+static void UNL6035052Power(void)
+{
+  GenMMC3Power();
+  SetWriteHandler(0x4020,0x7FFF,UNL6035052ProtWrite);
+  SetReadHandler(0x4020,0x7FFF,UNL6035052ProtRead);
+}
+
+void UNL6035052_Init(CartInfo *info)
+{
+  GenMMC3_Init(info, 128, 256, 0, 0);
+  info->Power=UNL6035052Power;
+  AddExState(EXPREGS, 6, 0, "EXPR");
+}