does anybody have a working version?

[mst3k]

Greetings,
I recently acquired this Multi Video Mac Video Processor. I can't find any information (other than the MacWorld ad- attached) and was wondering if anybody has a working version of this item and how they got it working?
Thanks in advance for your help!

 

[mst3k]

Greetings,
This apparently unusual Mac Video Processor attaches to the back of the Macintosh with a connector that passes through the security slot which connects to an internal ribbon cable that then connects to a board that sits between the analog to motherboard connector.
It came with a Mac 128 I purchased and I can't get it to work. The obvious problem, when looking at the backpack, is the 7 pin DIN connector that says 'Power'. There was no power adapter with the machine and I cannot find any information about this item online and/or where I might find the correct power adaptor or DIN pinout to test this interesting bit of Macdom.
My experience at reverse engineering the DIN is zero, nicht, nada...
Anybody have an idea where to start or who I might send this to for some paid reverse engineering?
Thank you!