I have a client with a Mitsubishi FX-20 EDM Wire machine. Device is about 20+ years old. Currently am trying to upgrade to new computer (Windows 7 to Windows 10) and the FX-20 seems to have an issue with the Win 10 communication. Communication is via RS-232 serial. I have duplicated all settings for the COM port (triple checked) but I can only get the program to load successfully from the Win 7 machine. Win 10 loads about the 1st 997 bytes and then spits out the following error: E20 Overrun Error. I understand that it is a communication error but I cannot seem to find out any specifics on what an E20 error is. I'd like to find out but there apparently no listing in the manual for it. I'm trying to find out to zero in on where the issue actually lies. Any help would be appreciated.