[Coco] CoCo2 Composite Video Mod

[Mark Ormond]

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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