[Coco] Q: CoCo2 border

[jdaggett at gate.net]

Eric

Interlaced or nonInterlace will depend on whehter you use the 
MC6847 or MC6847Y.The MC6847Y is interlaced video.

Both are 256 by 192 pixel graphics and display area.

james

 

On 11 Jan 2004 at 14:43, peak at mail.polarcomm.com wrote:

Date sent:      	Sun, 11 Jan 2004 14:43:45 -0600
From:           	peak at mail.polarcomm.com
Subject:        	Re: [Coco] Q: CoCo2 border
To:             	CoCoList for Color Computer Enthusiasts 
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> 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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