Searching for information reg. IBM 3979 (Expansion module for 3179G / 3192G coax (3270) terminal)

[Alexander Huemer]

Hi!

I am the proud owner of a 3192G coax terminal.
As I have recently learned, there is an expansion module for the 
terminal that allows you to attach a mouse and a IEEE-488 pen plotter to 
the terminal. Some information about it can be found at [1] and [2].
I am searching for people who are in possession of this expansion unit, 
out of interest how the PCB looks, etc.
If you have one, please respond.

-Alex

[1] http://bitsavers.org/pdf/ibm/3192/GA18-2590-1_IBM_3192-G_Color_Graphics_Display_Station_and_IBM_3279_Expansion_Unit_-_Setup_Instructions_198701.pdf
[2] http://www.bitsavers.org/pdf/datapro/alphanumeric_terminals/Datapro_C25_IBM.pdf