Radius Pivot IIsi Interface Card
The print on the left side of the card reads:
Pivot IIsi Interface
Radius Inc. (C) 1990
Made in USA
All Rights Reserved
A sticker on the reverse side reads:
The black connector at the bottom plugs into the IIsi's PDS slot, and a Nubus board can plug into the white connector at the top. The black connector at the end of the loose leads plugs into a funky connector at the extreme top-left, and the video connector plate attaches to the back of the chassis. If you add a Nubus card, I suppose the video connector could go somewhere else; I've never used it in that manner, nor do I have a IIsi around to play with.