[Coco] CM-8 Monitor Specs

[jdaggett at gate.net]

Brian

The CM8 is a CGA flavor monitor. It will not handle 640x480. The horizontal line 
frequency is fixed at 15.7 KHz +/-.

The later idea of using opamps to convert the Y/R-Y/B-Y signals from the 
MC6847 is a very doable project.  Besure that you wieght the conversion 
correctly. You use the HS signal to generate the verticle sync by using an 
appropriate counter (divider). For noninterlace this would, I believe, be 262. 

james



On 9 Feb 2007 at 16:28, Brian Hostetler wrote:

> Hi guys and gals,
> 
>             I just got my old coco setup going and realized one of my
>             coco2s
> has a composite video output with mono audio from a 1/8" stereo jack. 
> Most of the coco2s have an RF RCA output and I was curious if the
> setup I have is stock from Tandy, or was modified by someone.  In
> addition, the switch that normally selects channel 3 or 4, sets the
> composite output to color/monochrome.
> 
>             Another question I have is: does anyone have the specs to
>             the
> CM-8 monitor.  I have two of these monitors (for coco3 use), and was
> thinking of using them for the coco2 also.  I could use a composite to
> VGA scan converter, but I'm unsure if the CM-8 can handle 480 lines of
> video (@60Hz).  If I recall correctly, the sync signals on the CM-8
> are inverted also.  Another approach could be to convert the Y,B-Y,
> and R-Y signals coming from the MC6847 into RGB with op-amps and
> generate the sync signals somehow.  Sorry if this has already been
> covered, I was off of the list for a couple years when my email
> account was deleted.  If I figure out a way to do this, I suppose
> artifacted colors would be possible with the coco 3 on a CM-8  
> (maybe)..   Thanks.
> 
>                                    -Brian Hostetler
> 
> 
> 
> 
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