This ICOM uses the standard MiniDin6 pinout for 1200/9600 baud operation.
1200 baud cable is part of Yaesu FT-8xx cables kit. 9600 baud cable is available separately.
There is a Data port, but the manual only describes its use for configuration cloning, serial CAT control is not mentioned so we can assume that it is not available.
Instruction Manual (2.2 MB) - see pages 119-122