So, I've had a TK-940 for the past 3 years, and I'm trying to program it to my local school bus company, as a scanner. For some reason, it does not let me program it! It will let me type in everything, but I try to write it to the radio, and it says "Error with the COM port" or something.. I'm using DOSBOX on a windows 10 computer, the USB is from a two-way radio dealer. and yet it still won't program.. It says something about a serial port?