Re: Unusual Apple // card

["Leslie Ayling" <layling@intercoastcomau>]

"John L" <jlogo@zip.com.au> wrote in message
news:PXiaPESWbbJ=Z9t+x362ac4HTdmS@4ax.com...
> 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.

A 6821 chip is a twin parallel input/output port. It is difficult to see
from
your pic, but presumably there is another connector on the card with
which to connect to outside devices?

6821's were often used in eprom programmers/ printer cards on the
apple 2 series machines, but would have no use in a video card.

Leslie