[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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