[Coco] Q: CoCo2 border

[peak at mail.polarcomm.com]

Yep
and the coco uses only 1 Field not a Frame. No interlaced 
scan but a TV will still interlace its scanning.
Eric


---- Original message ----

>Date: Sun, 11 Jan 2004 10:36:02 -1000

>From: Theodore (Alex) Evans <alxevans at concentric.net>  

>Subject: Re: [Coco] Q: CoCo2 border  

>To: CoCoList for Color Computer Enthusiasts 

<coco at maltedmedia.com>

>

>

>On Jan 11, 2004, at 6:57 AM, jdaggett at gate.net wrote:

>

>> 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.

>

>That just doesn't add up.  I frame of NTSC video has 525 

lines 

>consisting of two fields of 262.5 lines each.  CoCo video 

uses 192 

>lines per field leaving a total of 70.5 lines unused.  It is 

possible 

>that the CoCo colors only 51 of these lines, and in fact a 

certain 

>number of these must be maintained as black in order to 

avoid extra 

>lines being drawn during retrace, but they are still there.

>

>

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