Open the "Windows Device Manager". Inside the Windows Device Manager, there will be a section labeled "Ports". Inside this section will be a list of the avaliable comm ports. If you are using a USB to serial adapter, this is a good time to plug it in. With the Windows Device manager open, plug in the USB to serial adapter. The new comm port should appear under the Ports section.
Video: What Comm Port Do I Use
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Old EAS Unlock - What Comm Port Do I use?
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