Mystery board

[Charles]

I have an unknown hex-height board which was included in a
miscellaneous lot of PDP-8A boards I recently purchased. But there
is no manufacturer's info except what looks like "K-3VO" in the
lower left corner, where there is a strange looking clamp-on
connector. Nothing is engraved on the metal "handles". There is a
Mostek 3880 (Z80 CPU) at the upper right, too. Date codes on all
the chips are '82 - '83.

Here is a link to a picture of it:
http://img2.imageweb.info/img2/6gj14927.jpg

and a closeup:
http://img2.imageweb.info/img2/aqw15714.jpg

Anyone know what this board is?

thanks
Charles