diff --git a/BizHawk.MultiClient/AVOut/NumericTextBox.cs b/BizHawk.MultiClient/AVOut/NumericTextBox.cs
new file mode 100644
index 0000000000..fc1cde62d6
--- /dev/null
+++ b/BizHawk.MultiClient/AVOut/NumericTextBox.cs
@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Windows.Forms;
+using System.Globalization;
+
+namespace BizHawk.MultiClient.AVOut
+{
+	// http://msdn.microsoft.com/en-us/library/ms229644%28v=vs.80%29.aspx
+	public class NumericTextBox : TextBox
+	{
+		// Restricts the entry of characters to digits (including hex), the negative sign,
+		// the decimal point, and editing keystrokes (backspace).
+		protected override void OnKeyPress(KeyPressEventArgs e)
+		{
+			base.OnKeyPress(e);
+
+			NumberFormatInfo numberFormatInfo = System.Globalization.CultureInfo.CurrentCulture.NumberFormat;
+			string decimalSeparator = numberFormatInfo.NumberDecimalSeparator;
+			string groupSeparator = numberFormatInfo.NumberGroupSeparator;
+			string negativeSign = numberFormatInfo.NegativeSign;
+
+			string keyInput = e.KeyChar.ToString();
+
+			if (Char.IsDigit(e.KeyChar))
+			{
+				// Digits are OK
+			}
+			else if (keyInput.Equals(decimalSeparator) && AllowDecimal)
+			{
+				// Decimal separator is OK
+			}
+			else if (keyInput.Equals(negativeSign) && AllowNegative)
+			{
+				// Negative is OK
+			}
+			else if (keyInput.Equals(groupSeparator))
+			{
+				// group seperator is ok
+			}
+			else if (e.KeyChar == '\b')
+			{
+				// Backspace key is OK
+			}
+			//    else if ((ModifierKeys & (Keys.Control | Keys.Alt)) != 0)
+			//    {
+			//     // Let the edit control handle control and alt key combinations
+			//    }
+			else if (AllowSpace && e.KeyChar == ' ')
+			{
+
+			}
+			else
+			{
+				// Swallow this invalid key and beep
+				e.Handled = true;
+				//    MessageBeep();
+			}
+		}
+
+		public int IntValue { get { return Int32.Parse(this.Text); } }
+		public decimal DecimalValue { get { return Decimal.Parse(this.Text); } }
+		public bool AllowSpace { set; get; }
+		public bool AllowDecimal { set; get; }
+		public bool AllowNegative { set; get; }
+	}
+}