The USB device is a Prolific. I have and know all the specs on it.
The curcuit to disable the momentary switch is all I need to know about.
It's a relay that will kill the momentary switch circuit IF I plug in the USB.
The 3 pins on the one side are the VDD voltage select.
The VDD is the 4th pin near the rear. No jumper on the 3 pins means no power to Vdd.
Don't need it for what I'm doing.
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