diff --git a/BizHawk.MultiClient/tools/RamPoke.cs b/BizHawk.MultiClient/tools/RamPoke.cs
index a4cce8f0d2..96b0f955b6 100644
--- a/BizHawk.MultiClient/tools/RamPoke.cs
+++ b/BizHawk.MultiClient/tools/RamPoke.cs
@@ -137,7 +137,16 @@ namespace BizHawk.MultiClient
                     }
                     break;
                 case asigned.SIGNED:
-                    //TODO
+                    if (InputValidate.IsValidSignedNumber(ValueBox.Text))
+                    {
+                        watch.value = int.Parse(ValueBox.Text);
+                    }
+                    else
+                    {
+                        MessageBox.Show("Invalid Address, must be a valid number number", "Invalid Address", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                        ValueBox.Focus();
+                        ValueBox.SelectAll();
+                    }
                     break;
                 case asigned.HEX:
                     if (InputValidate.IsValidHexNumber(ValueBox.Text))
diff --git a/BizHawk.Util/InputValidate.cs b/BizHawk.Util/InputValidate.cs
index 111fd4543b..ec68ef871f 100644
--- a/BizHawk.Util/InputValidate.cs
+++ b/BizHawk.Util/InputValidate.cs
@@ -27,6 +27,37 @@ namespace BizHawk
             return true;
         }
 
+        /// <summary>
+        /// Validates all chars are 0-9 or a dash as the first value
+        /// </summary>
+        /// <param name="Str"></param>
+        /// <returns></returns>
+        public static bool IsValidSignedNumber(string Str)
+        {
+            char[] input = (Str.ToCharArray());
+            ASCIIEncoding AE = new ASCIIEncoding();
+            // Check each character in the new label to determine if it is a number.
+            for (int x = 0; x < input.Length; x++)
+            {
+                // Encode the character from the character array to its ASCII code.
+                byte[] bc = AE.GetBytes(input[x].ToString());
+
+                // Determine if the ASCII code is within the valid range of numerical values.
+                if (bc[0] > 58)
+                    return false;
+
+                if (bc[0] < 47)
+                {
+                    if (bc[0] == 45 && x == 0)
+                        continue;
+                    else
+                        return false;
+                }
+                
+            }
+            return true;
+        }
+
         /// <summary>
         /// validates is a Hex number 0-9, A-F (must be capital letters)
         /// </summary>