diff --git a/src/debugger/TrapArray.hxx b/src/debugger/TrapArray.hxx
new file mode 100644
index 000000000..778ba4d9f
--- /dev/null
+++ b/src/debugger/TrapArray.hxx
@@ -0,0 +1,55 @@
+//============================================================================
+//
+//   SSSS    tt          lll  lll
+//  SS  SS   tt           ll   ll
+//  SS     tttttt  eeee   ll   ll   aaaa
+//   SSSS    tt   ee  ee  ll   ll      aa
+//      SS   tt   eeeeee  ll   ll   aaaaa  --  "An Atari 2600 VCS Emulator"
+//  SS  SS   tt   ee      ll   ll  aa  aa
+//   SSSS     ttt  eeeee llll llll  aaaaa
+//
+// Copyright (c) 1995-2017 by Bradford W. Mott, Stephen Anthony
+// and the Stella Team
+//
+// See the file "License.txt" for information on usage and redistribution of
+// this file, and for a DISCLAIMER OF ALL WARRANTIES.
+//============================================================================
+
+#ifndef TRAP_ARRAY_HXX
+#define TRAP_ARRAY_HXX
+
+#include "bspf.hxx"
+
+class TrapArray
+{
+public:
+  TrapArray() : myInitialized(false) {}
+
+  bool isSet(const uInt16 address) const { return myCount[address]; }
+  bool isClear(const uInt16 address) const { return myCount[address] == 0; }
+
+  void add(const uInt16 address) { myCount[address]++; }
+  void remove(const uInt16 address) { myCount[address]--; }
+  //void toggle(uInt16 address) { myCount[address] ? remove(address) : add(address); } // TODO condition
+
+  void initialize() { myInitialized = true; }
+  void clearAll() { myInitialized = false; memset(myCount, 0, sizeof(myCount)); }
+
+  bool isInitialized() const { return myInitialized; }
+
+private:
+  // The actual counts
+  uInt8 myCount[0x10000];
+
+  // Indicates whether we should treat this array as initialized
+  bool myInitialized;
+
+private:
+  // Following constructors and assignment operators not supported
+  TrapArray(const TrapArray&) = delete;
+  TrapArray(TrapArray&&) = delete;
+  TrapArray& operator=(const TrapArray&) = delete;
+  TrapArray& operator=(TrapArray&&) = delete;
+};
+
+#endif