[Coco] Re: [Color Computer] CoCo 2 questions.

[Bob Devries]

Again I have to disagree. I own a 'B' revision COCO2 that is 16K. The B
refers to the fact that it uses the 6847T1 chip.

----- Original Message -----
From: "Mike Pepe" <lamune at doki-doki.net>
To: <ColorComputer at yahoogroups.com>
Sent: Friday, May 13, 2005 7:55 AM
Subject: [Coco] Re: [Color Computer] CoCo 2 questions.


>
>
> Phill Harvey-Smith wrote:
> > Glen VanDenBiggelaar wrote:
> >
> >>Hi, Phill,
> >>What Model number is it?
> >
> >
> > 26-3136A It is a UK PAL version tho.
> >
>
> I have a scan of that schematic. It's pretty hefty at 9MB...
>
> >>I have the service manual the 3026,3027. Upgrade instructions are on my
> >>website (www.coco.8bit-micro.com) on the CoCo 2 page. yes, You want to
> >>replace the chips with 4164 with 200 NS or better time (a good example
is
> >>TMM4164AP-20 ). I will look closer at the scematics for the other chips
you
> >>mentioned.
>
> It's a little different, Glen
>
> >
> > So looks like upgrade is indeed 2x41464, doesn't work at the moment, so
> > if you (or anyon else) have a circuit for this model would be most
> > greatfull.
>
> The official upgrade is 8x64kx1, but you can do 2x64kx4 if you want.
>
> > Fault is vertical lines of @ down the screen, I suspect a data path
> > fault, ie one of the LS chips that sits between Ram and VDG and RAM and
> > CPU.
>
> If you pulled the 785 and popped it in the dragon, it's not that then.
>
> I'd guess dead 6809. If the video chip is dead that's going to be hard
> to find, it should be a 6847T1 in there. (not compatible with the normal
> 6847)
>
> the A model, by the way, is a 16k extended basic. The B version is 64k.
>
>
>
>
>
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