Info for this Connector was obtained from ICOM CI-V Hardware Page
Here are some images of the OPC478 connector someone is making for me.
Icom OPC-478 Interface.
The ICOM design for the OPC-478 interface is a simple transistor circuit used for cloning. The version by Chris VK3JEG http://uk.geocities.com/blakkekatte/hardware/opc-aus.jpg gives equivalents for the transistor and diode parts. That version is the one commonly found on the internet. However the one from ICOM Japan’s site http://uk.geocities.com/blakkekatte/hardware/opc478-japan.jpg has a few modifications. I have added the transistor and diode equivalences from VK3JEG’s copy of the earlier version of the interface. WA0SXV http://www.wa0sxv.us/ci-v.html has some reservations that this design might not properly implement the RS-232 protocol.