Well I received the cable and it doesn't work.
From near as I can figure from reading the manuals the scanner is supposed to go into clone mode when the cable is plugged it. That didn't happen.

Just for giggles I plugged in a regular stereo audio patch cable and bingo, scanner went in to clone mode.
Contacted vendor so lets see what happens.
I also had another
thread asking about frequency step sizes which was the reason I purchased this cable to start with. Was hoping to use it with Win97 to enter the proper Canadian frequecies in. The process of trying the new wrong cable gave me the opportunity to try out the Win97 software. I used this
thread as a reference and I was not able to enter the frequencies no matter if psr 300 was selected or not under the misc tab. So its looking like Win97 not the right animal for this job. Arc300 and PSREdit300 both show evidence of support but I'm still unsure if you can download 400c data into a pro-163.
Comments?