[Coco] CoCo 128-column text mode

[Zippster]

I was kind of wondering about the composite image being so far to the left on my coco3
that some of the picture was actually cut off.

It seemed too much to be something that would have been produced that way, so I
thought maybe some component value in mine had drifted enough over the years
to cause it.  So they’re all like that?

I guess there’s no padding in the signal to compensate for overscan.

- Ed

> 
> Did we ever figure out why the TV output of the CoCo 3 was so off center compared to the CoCo 1 and 2? At the time, we thought it was to force CoCo 3 users to have to buy a monitor if they wanted to use the larger screens. I had to open my TV set up and adjust the centering as far as I could make it just to get the left edge of 80 on screen. I remember those early days reading the blurry 80 column artifacted text on a TV until I got a composite greenscreen monitor.
> 
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