MC-58DM

                              PIN 1 UP. 
                              PIN 2 +8 VOLTS.                                       
                              PIN 3 CHASSIS GROUND.  
                              PIN 4 PTT.                               
                              PIN 5 MIC GROUND/SHIELD                  
                              PIN 6 MIC.                               
                              PIN 7 RX AUDIO.N/C SOME MODELS           
                              PIN 8 DOWN.