Hi @buildlog thanks for issue submit

The code that fill the COM menu use the .net framework function SerialPort.GetPortNames() that return a list of the serial port names for the current computer.

https://msdn.microsoft.com/it-it/library/system.io.ports.serialport.getportnames(v=vs.110).aspx

CBPort.BeginUpdate();
CBPort.Items.Clear();
foreach (string portname in System.IO.Ports.SerialPort.GetPortNames())
{
	string purgename = portname;

	//FIX https://github.com/arkypita/LaserGRBL/issues/31
	if (!char.IsDigit(purgename[purgename.Length - 1]))
		purgename = purgename.Substring(0, purgename.Length - 1);

	CBPort.Items.Add(purgename);
}
CBPort.EndUpdate();

As documented the port names are obtained from the system registry (for example, HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM). If the registry contains stale or otherwise incorrect data then the GetPortNames method will return incorrect data.

Furthermore GetPortNames has some known bugs (releted to incorrect data in registry) that produce wrong results, so i have added that "purgename" to remove the last character if it is not a number.

In my opinion you should clean out your HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM registry key.

More info here: #31

Uh oh!

COM Menu goes a little crazy sometimes. #397

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