[Coco] Design files for 512k or more CoCo3 upgrade

[Ken H.]

There was a 256k upgrade for the Dragon / CoCo2 which was published back in
1989 by Bob Hall in the Dragon Update newsletter.

It's based on 256K with 8k pages, just like the CoCo3, which allowed to run
Tandy OS9 Level 2. That makes it much more useful than the banker board.

Here is the series of articles which include the schematics and OS9 patches
(the final 256k design is at the end):
https://drive.google.com/file/d/0B9wgnqGFDmhka2JLS1hrUDhJVEU

Ken


On Sun, Nov 30, 2014 at 2:55 PM, Gene Heskett <gheskett at wdtv.com> wrote:

> On Sunday 30 November 2014 00:13:52 Zippster did opine
> And Gene did reply:
> > Hi everyone,
> >
> > Are there any design files available that anyone knows of for a
> > good CoCo 3 memory upgrade that are ready to go?
> > Gerbers, Eagle or KiCad files or the like?
> >
> > I’ve got a stock CoCo 3 that needs some more memory, and
> > I think I’d like to build one rather than buy one.
> >
> > What’s out there?
> >
> > From what I’ve picked up, it seems like the CoCo1 and 2 are
> > limited to 64k maximum.  Is this true, or has anyone ever made larger
> > memory upgrades?
> >
> > Thanks,
> >
> > - Ed
>
> There was, I faintly recall, a 256k made for the coco1 & 2's, called the
> Bankster or some such.  I used to see it advertised in the Rainbow.  But
> that is about it that I can recall now.
>
> Has anyone got one and is using it, testimony please?
>
> Cheers, Gene Heskett
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