I also have a Yaesu FT-100 and I’m considering connecting it up to the RigPi. (I do have the I/F cable).
My concern is that this is a ~20 year old radio and there is no controls to power the rig on & off. However, I could turn the Power Supply on/off using an SSR (they are available on Ebay for 2 or 3 $.). Require a few milliamps to turn on. HOWEVER, this requires a connection to the RigPi GPIO (no big deal) but it would also then require control from the RigPi remote to toggle that GPIO pin.
IS THERE A WAY TO TOGGLE A GPIO PIN USING A BUTTON & SOME SORT OF MACRO?