May have found a RC-10 for sale. These were compatible with the remote control interface on this radio (and a few other Kenwoods) It looks like a car phone handset. Remember when cellphones came in a bag variety? Kinda like that. I'm hoping that I can use my Bus Pirate with it to sniff out the correct commands to control my radio. May be just what I need to get my TM-241a computer control project back up and running.