<br> <u>CAT Connector</u><br> Pin 1: GND<br> Pin 2: SERIAL OUT<br> Pin 3: SERIAL IN<br> Pin 4: PTT<br> Pin 5: S/PO (does anyone know what this means?)<br> Pin 6: NC<br> <br>What version of EPROM is in these radios?<br> <br>