[Coco] Coco3 question

[Robert Gault]

Joe F wrote:
> Does anyone know if the coco3 has 262 or 263 scan lines.
> the 6847 spec sheet indicates 262.5 but I'm not sure it applies to the GIME
> as well.
> thanks.
> 

Those are the total number of scan lines per screen but it includes the 
blanking pulse, top, and bottom borders. There are only 192 effective 
lines of screen content with a 6847.

The GIME extends this up to 225 lines of usable screen data. You still 
need to include blanking and border areas.