Unusual Apple // card

[John L <jlogo@zip.com.au>]

I have obtained an Apple // card whose purpose I can't easily
identify.  The card is called "The Micro Works" with the letters
"DS-65 (c) 1979" printed directly underneath the title - which is
located on the top left of the card.  

On the card itself are a number of small IC's labeled "74LS85N" and
one large IC labeled "F6821P".  There is also an " DS-65 EPROM II"
which is socketed as well.  On the top of the card are three trim pot
wheels with the letters "B" "C" and "W" respectively labeled above
each pot.

I have a picture at this URL (A bit unclear) if anyone wants a look:

http://www.zip.com.au/~jlogo/microw.jpg

The card >looks< like a video card of some sort but I'm unsure since I
can't find any documentation for the card.  A google search reveals
nothing as well.