[Coco] CoCo2 Composite Video Mod

[Luis Antoniosi (CoCoDemus)]

But you have to lift the pins on mc1372 or it won't work. Pins 8, 10, 12,
13, 14.

Or optionally you pull the others pins into a separate board with its own
mc1372.



On Mon, Nov 11, 2013 at 10:14 AM, Michael Graham <mkgraham at gmx.com> wrote:

> One of the circuits I had tried was very similar to that one, but didn't
> work at all.
>
> --Michael
>
> On 11/11/2013 07:14 AM, Daniel Campos wrote:
>
>> For any "good" composite output on the CoCo1/2 you will need to make the
>> circuit described on the 6847 datasheet on page 12:
>>
>> http://people.ece.cornell.edu/land/courses/ece4760/ideas/mc6847.pdf
>>
>>
>> If you don't mind not having artifact colors, you can also do an S-Video
>> output for your CoCo2. The image quality is excelent! I just have done on
>> my own CoCo2 this last weekend. Pictures on the link bellow:
>>
>> https://picasaweb.google.com/109345699838454178536/TRS80ColorComputer2#
>> 5944291386400575762
>>
>> Daniel
>>
>> 2013/11/11 Michael Graham <mkgraham at gmx.com>
>>
>>  See, I've tried doing the CoCo 1 style mods to the chip inside the RF can
>>> in the CoCo 2, but didn't get any usable output.  I wish someone would
>>> just
>>> publish a composite video mod that was verified to work on the CoCo 2,
>>> but
>>> I haven't been able to find one anywhere.
>>>
>>> --Michael
>>>
>>> On 11/11/2013 06:10 AM, Bruce W. Calkins wrote:
>>>
>>>  A: the chip numbers are different in a CoCo 2.
>>>> B: the MC1372 chip in the CoCo 2 is inside the RF modulator "can" which
>>>> might be soldered.
>>>> Bruce W.
>>>> =========================
>>>>
>>>>
>>>> ----- Original Message ----- From: "Gabriel Holland"
>>>>
>>>> I have been trying to mod a 64k CoCo2 to color composite out. I have
>>>> tried 2 different mods and rebuilt one of them several times but all I
>>>> get is a black screen. I have noticed that the mods usually are listed
>>>> as CoCo1 but have read that they should work on a 2. Has anyone here
>>>> successfully installed color composite on a CoCo 2? If so which circuit
>>>> did you use?
>>>>
>>>>
>>>> Here is one of the pages I used. It has 3 Composite mods and I built the
>>>> first 2 (Fig 1 and "the Other Bob").
>>>> http://sparksandflames.com/g35.html
>>>>
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>
>
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