[Coco] original 16k CoCo 1 upgrade to 64k

[Arthur Flexser]

To tell which board you had, you needed to shine a light through the air vent on
the right to see the number on the board, which would have a letter suffix that
indicated your type of board.  Except that the F board didn't have an F but some
other designation that I forget--people referred to it as the F board because it
was the one that succeeded the E board, but it lacked an actual F.

Art

On Thu, 28 Oct 2004, Benoit Bleau wrote:

> My first coco was a 32k model, D board, and I remember vaguely that, to
> unlock the full 64 K, I had to add an extra AND gate.  I think there were
> also some resistors to cut, or add, not sure which.
> 
> IIRC, the F board had all the required components, you just needed to change
> jumpers.  The earliest board I have ever seen was the C board, and could not
> be upgraded. It required too extensive modifications.
> 
> I'm not sure how the boards are identified either. I just recall that in
> 84-85, I new the difference by looking at the board :(
> 
> The D board 64k mod was published in the Color Computer News magazine by
> Frank Hogg to allow full ram access for Flex. I think I still have the
> magazine somewhere.  Let me know if you want a scan of the article, I'll dig
> it out of storage.
> 
> As for the F board, I'm sure that there's an article in Rainbow on how to
> upgrade it (maybe from Marty Goodman...)
> 
> 
> -Ben
> 
> 
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