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diff --git a/src/devices/oprom/yabel/mem.h b/src/devices/oprom/yabel/mem.h
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+/******************************************************************************
+ * Copyright (c) 2004, 2008 IBM Corporation
+ * All rights reserved.
+ * This program and the accompanying materials
+ * are made available under the terms of the BSD License
+ * which accompanies this distribution, and is available at
+ * http://www.opensource.org/licenses/bsd-license.php
+ *
+ * Contributors:
+ * IBM Corporation - initial implementation
+ *****************************************************************************/
+
+#ifndef _BIOSEMU_MEM_H_
+#define _BIOSEMU_MEM_H_
+#include <x86emu/x86emu.h>
+#include <types.h>
+
+// read byte from memory
+u8 my_rdb(u32 addr);
+
+//read word from memory
+u16 my_rdw(u32 addr);
+
+//read long from memory
+u32 my_rdl(u32 addr);
+
+//write byte to memory
+void my_wrb(u32 addr, u8 val);
+
+//write word to memory
+void my_wrw(u32 addr, u16 val);
+
+//write long to memory
+void my_wrl(u32 addr, u32 val);
+
+#endif