[Coco] CoCo2 Composite Video Mod

[Michael Graham]

I can't remember by now whether I lifted any pins or not, but that very 
well may have been the problem.  I think I remember socketing the MC1372 
for some reason (maybe it was just to make the circuit easier to 
construct) and using a wire-wrap socket to plug in a piece of perfboard 
I used to try and make the mod, though.

--Michael


On 11/11/2013 09:17 AM, Luis Antoniosi (CoCoDemus) wrote:
> 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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>
>