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yell0w_lantern

CoCo 2 AV Mod

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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

 

Before anyone asks, I do have a CoCo 3 already.

 

 

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Yeah, I also tried a couple of CoCo 1 video mods on my CoCo 2 without success. It seems like Tandy changed the format of the output to the RF modulator at some point in the CoCo 2.

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The circuits you see for composite mods are generally for the CoCo 1. In that model, the Motorola MC1372 is near to the Motorola MC6847. The CoCo 2 was reduced in cost and some circuits were redesigned. the MC1372 moved to inside the RF modulator. So, you won't be able to use CoCo 1 A/V mode on a CoCo 2.

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