[Coco] Another rare brazilian coco clone...

[Juan Castro]

Jason Law of the FB CoCo group gave us the scoop of how that works.
It's a ridiculously easy hack:
http://users.vialink.com.br/jcastro/CoCo_Pause_Switch.pdf

On Sun, Jan 27, 2013 at 11:35 PM, Luis Fernández <luis46coco at hotmail.com> wrote:
> HiSaw that has a pause button, or switch
>
>> Date: Sun, 27 Jan 2013 23:55:27 -0200
>> From: daniel.campus at gmail.com
>> To: coco at maltedmedia.com
>> Subject: Re: [Coco] Another rare brazilian coco clone...
>>
>> Hi Dennis,
>>
>> The circuit I used is based on the schematic present at page 12 of the
>> MC6847 datasheet:
>>
>> http://people.ece.cornell.edu/land/courses/ece4760/ideas/mc6847.pdf
>>
>> In the place of the 3.9K and 3.3K resistors, I changed both for 10K
>> resistors. The 470 Ohms resistor I removed. In the place of the 560 Ohm
>> resistor I put a 1K trimpot for fine tunning.
>> On mine I also put two trimpots in pulldown on both B-Y and R-Y lines
>> that come from 6847 to 1372. It helps both to regulate colors and
>> decrease color saturation.
>> All else remains exactly the same as on the datasheet.
>>
>> I used this formula on both MX-1600 and on the Color64, another Coco
>> clone I have:
>>
>> https://picasaweb.google.com/109345699838454178536/LZColor64#
>>
>> Regards,
>> Daniel
>>
>> Em 27/01/2013 23:25, Denis Bisson escreveu:
>> > Daniel Campos <daniel.campus at ...> writes:
>> > ...
>> >> Last week I acquired another rare brazilian coco clone, the Dynacom MX-1600.
>> >> https://picasaweb.google.com/109345699838454178536/DynacomMX1600
>> >> It came on bad shape and not working, but after some work, it's fully
>> >> functional again.
>> > ...
>> >
>> >    Hi!
>> >
>> >    Nice picture and work!
>> >
>> > May I asked you if you could share with me the MC1472 circuit you made?
>> >
>> > I've already made something like that two times in the past to convert regular
>> > COCO to provide NTSC signal directly. But according to your picture, you have
>> > much more potentiometers than the application note I am using for that patch.
>> > I would be curious to use your circuit as your picture seems to show a better
>> > result.
>> >
>> > Thanks.
>> >
>> > Dennis.
>> >
>> >
>> >
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>>
>>
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