[Premium-Rx] Harris RF-590A R-2368 and URR-79

[kmd xplornet.ca]

Hello All,
I've just aquired a nice Harris RF-590A  variant. Its tag designates it only
as a  URR-79.  I can't find much specific info on the web. Would anyone know
the differences between it and the more common R-2368? Visually, there is an
extra computer I/O plug  on the back just labelled J8 Option and the squelch
seems to be the nor COR type.
Any thoughts?

Thanks,
Keith ve3ts