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Garbled/no video from CoCo 2


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I was given a CoCo 2 recently and have been trying to set it up. I know that the computer itself must be working because MOTOR ON and MOTOR OFF click the relay. However, I am only getting a mess of white lines on my TV. Channels 3 and 4 look the same.

My output setup currently is an RCA cable running from the CoCo's "To TV" jack and through an RCA to Coax adapter into my old TV's UHF/VHF coaxial antenna port.

I'm not sure what's going on. I am tempted to blame the internal modulator, which does not have a channel switch despite there being a slot for it in the case. The modulator board says it's from 1983 and is undamaged so I would assume it is supposed to be like this.

Any help would be appreciated.







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On 9/7/2022 at 5:23 PM, MrDave said:

There was a version for education had factory a/v..


That's interesting. Was this a Coco I or II model? 


My High School had a about a dozen Cocos (I, II, and even a few IIIs) back in the 1980s. The Coco I and II used cheap colour TVs as monitors; only the Coco III used a proper monitor. Had a version been available that output composite it would have been much better than the lousy TVs. The local education sales rep must have been unaware of this model (or it was unavailable) or he would have pushed it.  

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