diff --git a/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs b/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs
index a3ced3bc67..19727f21e4 100644
--- a/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs
+++ b/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs
@@ -604,7 +604,7 @@ namespace BizHawk.Client.EmuHawk
 			}
 
 			Dictionary<long, long> dict = new Dictionary<long, long>();
-			var range = new MutableRange<long>(addresses[0], addresses[0] + addresses.Count);
+			var range = new MutableRange<long>(addresses[0], addresses[0] + addresses.Count - 1);
 
 			switch (DataSize)
 			{
diff --git a/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs b/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs
index 97c4cde7be..873da2167a 100644
--- a/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs	
+++ b/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs	
@@ -111,7 +111,7 @@ namespace BizHawk.Emulation.Common
 				throw new ArgumentException();
 			}
 
-			if (addresses.EndInclusive - addresses.Start != values.Length)
+			if (addresses.EndInclusive - addresses.Start + 1 != values.Length)
 			{
 				throw new InvalidOperationException("Invalid length of values array");
 			}
@@ -147,14 +147,14 @@ namespace BizHawk.Emulation.Common
 				throw new ArgumentException();
 			}
 
-			if (addresses.EndInclusive - addresses.Start != values.Length)
+			if (addresses.EndInclusive - addresses.Start + 1 != values.Length)
 			{
 				throw new InvalidOperationException("Invalid length of values array");
 			}
 
-			for (var i = addresses.Start; i < addresses.EndInclusive; i++)
+			for (var i = addresses.Start; i <= addresses.EndInclusive; i++)
 			{
-				values[i] = PeekUint(i, bigEndian);
+				values[i - addresses.Start] = PeekUint(i, bigEndian);
 			}
 		}
 	}