Programming interface schematics for Kenwood :simple RS232 cable, see user manual.
Programming software for Kenwood TS-480 (TS 480 TS480) :
PDF User Manual for Kenwood TS-480 (TS 480 TS480) : Kenwood TS-480 Advanced User Manual
PDF Service Manual/schematics for Kenwood TS-480 (TS 480 TS480) :