Apple II graphics

[derekn@vw.ece.cmu.edu (Derek B. Noonburg)]

Once upon a time, I saw an article explaining how the Apple II (not
GS) generates its video output.  I remember it being a rather clever
hack involving a very small number of simple chips, and I'd really
like to find that article.  (There was also something that explained
how to double the number of colors you could display -- this may have
been in the same article?)

I've looked through the FAQ and ftp archives without finding anything.

Can anyone give me a pointer to the magazine or book that this
appeared in?

Thanks.

- Derek

--
Derek Noonburg                                derekn@vw.ece.cmu.edu
Electrical & Computer Engineering Dept., Carnegie Mellon University