[Coco] Upgrading a CoCo 1

[Arthur Flexser]

If you decide to upgrade, instructions are in the May 1984 Rainbow for
getting a D board to 64K.

https://archive.org/details/rainbowmagazine-1984-05

You will also need to upgrade your Color Basic ROM if it is version 1.0
(type EXEC 40075 to display the version number);  Color Basic 1.0 supported
only 4K and 16K.

Art

On Wed, Jan 16, 2019 at 5:56 PM Neil Cherry <ncherry at linuxha.com> wrote:

> On 1/16/19 5:30 PM, Bruce W. Calkins wrote:
> > "D" board.  Clip 8 capacitors, add wiring to use "extra" gates on the
> 74LS02, cut some
> > traces and other additional wiring.  Of the CoCo 1s, the "D" board is
> the most
> > complicated.  Given the relative rarity of unmodified "D" boards I would
> be reluctant to
> > upgrade it.
>
> Rats, now I'm torn as to what to do. I've got a CoCo 2 so I don't need to
> upgrade it.
> But I do need to find a new top. Looks like this baby was at the bottom of
> the large,
> heavy pile. It was in the junk pile and a slight donation ($10) let me
> walk away with
> it. I knew it would go unloved otherwise so I took it home. It's keeping
> company with
> my other Vintage (Atari A8s, bunch of other 6809, a Dage MC-3 (1802), PTK
> 68000 ... ).
>
> Okay, I can leave the CoCo 1 stock. My CoCo 3 is going to get a memory
> upgrade for NitrOS9 LII (LIII ?) and a 6309. I might give the CoCo 2
> to the museum.
>
> --
> Linux Home Automation         Neil Cherry       ncherry at linuxha.com
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