[Coco] Does XC80652P = 6847 VDG?

Bill Pierce ooogalapasooo at aol.com
Mon Dec 16 14:32:33 EST 2013

The "The Full Turn of The Screw" book by Tony DiStefano is here:

Turn to page 89 for "More on the New Video Display Generator" and to 92 for "The Coco 2 B"
You'll find all the pin-out info on the chip and more. There may even be more articles, those are just the ones I remember.
I know Marty Goodman also did an article in Rainbow on this chip as well. I just can't find it at the moment

Hope it helps

Bill Pierce
My Music from the Tandy/Radio Shack Color Computer 2 & 3
Co-Webmaster of The TRS-80 Color Computer Archive
Co-Contributor, Co-Editor for CocoPedia
E-Mail: ooogalapasooo at aol.com

-----Original Message-----
From: Brendan Donahe <brendan at polylith.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Mon, Dec 16, 2013 2:08 pm
Subject: Re: [Coco] Does XC80652P = 6847 VDG?

The XC80642P is an updated 6847 VDG with an integrated off-chip latch.  It
is also known as the 6847T1.  DiStefano (sp?) had a turn-of-the-screw
article on it.  The pinout differs from the 6847.

Hope this helps,

On Mon, Dec 16, 2013 at 12:59 PM, Jim Harre <jim at tweech.com> wrote:

> I'm new to the CoCo, but not to 8-bit computers. After recently picking up
> a CoCo 2, I found Dennis Kitsz' last Custom Color column with a schematic
> for a composite video out circuit. With the circuit built on a piece of
> perf board, I opened up the CoCo 2 to hook it up to the 6847 VDG chip and
> ran into a problem.
> My CoCo doesn't have a 6847.
> Eliminating the other 40 pin chips left me with the XC80652P. A Google
> search let to a couple links - one said it is an updated 6847, another said
> it is an updated keyboard controller. Since it sits between the RF cage and
> the keyboard connector, I guess either is possible. So, before I solder in
> my composite adapter and possibly release the magic smoke, is the XC80652P
> an updated 6847 VDG?
> <*> Jim
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco

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