[Coco] CoCo 2 Factory Composite Video RE'd

[lciotti1]

Cough...cough... schematic please!

> Zippster <mailto:zippster278 at gmail.com>
> December 14, 2014 at 12:27 AM
> Hi Everybody,
>
> I’ve successfully reverse-engineered the factory composite board found in
> a CoCo 2 I purchased on ebay. This board is a direct replacement for 
> the RF modulator.
> It requires no modifications to the case, and uses the channel switch 
> to select B&W or COLOR.
>
> It seems to have very good output - I’d say better than the reference 
> circuit from the 6847 data sheet.
> It’s a more involved circuit with voltage regulators on-board and is 
> AC coupled.
>
> Pics of the factory and re’d prototype can be seen here for those who 
> are interested.
>
> <https://sites.google.com/site/thezippsterzone/coco2-composite-board-2 
> <https://sites.google.com/site/thezippsterzone/coco2-composite-board-2>>
>
>
> - Ed
>
> Allen Huffman <mailto:alsplace at pobox.com>
> December 13, 2014 at 11:54 PM
>
>
> Here is a placeholder page for this “contest”:
>
> http://www.cocopedia.com/wiki/index.php/CoCoCoding_1980_Contest 
> <http://www.cocopedia.com/wiki/index.php/CoCoCoding_1980_Contest>
>
> We can come up with ideas and suggestions. I just haven’t had time to 
> think about it much.
>
> Xroar can run Color BASIC 1.0 (bas10.rom is what you want) so that 
> would be a very easy one to get going to play with this if you don’t 
> have an actual 4K CoCo around ;-)
>
> I will have to add a section about using Xroar and setting up a 
> cassette image and stuff.
>
> — Allen
>
>
> Allen Huffman <mailto:alsplace at pobox.com>
> December 9, 2014 at 2:56 PM
> Would anyone be interested in having some silly fun, and writing 
> programs for the original 1980 4K CoCo with COLOR BASIC 1.0?
>

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