[Coco] Q: CoCo2 border

[Theodore Evans (Alex)]

On Jan 11, 2004, at 11:57 AM, jdaggett at gate.net wrote:

> The other lines not accounted for are vertical balnking.

They are still there.  And yes, most video hardware enforces a minimum 
number of lines for vertical blanking, but they are still border lines 
as there is only a single vertical sync pulse which triggers resetting 
the sawtooth wave used for vertical position.  The system creating the 
video signal cannot know how fast the monitor in question will actually 
reset to the top, and the signal is held at black (actually blacker 
than black) to prevent interference with the proper frame as I said.  
The answer that he was looking for may be your 25+26 or my 70.5 
depending on what he wants to use the information for.