[Coco] CoCo2 Composite Video Mod

[Simon Jonassen]

Funny you should say the coco II doesn't generate a composite signal.....

I have just run 2 shielded cables from the input to the modulator to 2 rca
jacks on the rear of the case....

My monitor is composite.... Works fine.... (PAL COCO IIB)

?????

/Simon :-)
 

-----Oprindelig meddelelse-----
Fra: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] På
vegne af Michael Graham
Sendt: 11. november 2013 16:16
Til: CoCoList for Color Computer Enthusiasts
Emne: Re: [Coco] CoCo2 Composite Video Mod

Alright, that one looks like it might actually work.  I'll have to try and
gather some parts for it, later.

--Michael

On 11/11/2013 07:12 AM, Mark Ormond wrote:
> The coco2 and coco1's video out circuit is completely different.
> The original mods for the one take advantage of the fact that the rf
modulator is fed a straight composite input.
> The coco2 never generates the composite signal to begin with.
>
> I have a coco2 with a composite out circuit in it, and I made a copy of
the schematics, but I never built another one to try.
>
> http://www.svfdtn.com/cbm/coco2comp.jpg
>
>
>   
>   GND = GND
>   
>   G = Pin 8 of MC1372P
>   
>   Y = Y on Modulator
>   
>   S = S on Modulator
>   
>   R = Left side of C32 (Looking from front)
>
> -----Original Message-----
> From: coco-bounces at maltedmedia.com 
> [mailto:coco-bounces at maltedmedia.com] On Behalf Of Michael Graham
> Sent: Monday, November 11, 2013 7:59 AM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] CoCo2 Composite Video Mod
>
> 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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