[Coco] Q: CoCo2 border

[jdaggett at gate.net]

Torsten

Top border is 25 lines and bottom border is 26 lines. The right and 
left borders in pixel count are more dependant on the pixel clock 
frequency. 

>From the 6847 spec 

Th3 border period is 7.5 to 8.3 uS.Typical is about 8 uS.

With a clock frequency of 3.579 MHz the following

Visable screen is      128.0 * 1/f  = 35.759 uS
Visable and border   185.5 * 1/f  = 51.822 uS 

If you have 256 dots in 35.759 uS you have a dot clock at twice the 
color burst or 7.159 mHz. It yields a border of 29 pixels on the left 
side and 28 pixels on the right. 

james
 

On 11 Jan 2004 at 16:30, Torsten Dittel wrote:

To:             	coco at maltedmedia.com
From:           	Torsten Dittel <Torsten at Dittel.info>
Date sent:      	Sun, 11 Jan 2004 16:30:46 +0100
Subject:        	[Coco] Q: CoCo2 border
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> Hi,
> does anyone know how big in scanlines/pixels is the
> vertical/horizontal border of an NTSC CoCo2?
> 
> Torsten
> 
> 
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