[Coco] Converting CoCo 2 and CoCo 3 to Component video?

[Paul T. Barton]

I built a "6847 signals" convertor to CGA.
It used fast comparators and a color
remapping pal to do the conversion.
Worked great. I still have the circuit
and a CGA monitor to test it with.

It worked by intercepting the 3 color
signals and doing the conversion there.

Paul

--- Roger Taylor <rtaylor at bayou.com> wrote:

> At 03:07 PM 11/2/2004, you wrote:
> >John
> >
> >Essentially that is correct. The drawback is
> that the MC6847 has
> >only has 2 bit DACs internally for the R-Y and
> B-Y signals and Y level is 3 bits.
> >
> >The thing is Component video is essentialy the
> modulation signal
> >for the RF carrier like channel 3 or 4.
> COmponent video is not some
> >new fangled system. All component video is are
> the Luminance and
> >Chroma signal that would go to an RF modulator
> are brought out
> >the back of the unit and distributed.
> >
> >Converting a Coco1 or 2 to component video
> would gain no
> >additional color but may gain a better qulaity
> picture. At least there
> >is no RF to demodulate and all that.
> 
> 
> I've got the pinouts and specs for the CoCo 1
> 6847.  I've seen some 
> composite to VGA converters for under $100 so
> now I'm really tempted to 
> install such a board inside the CoCo and mount
> my own VGA port on the back 
> of the case.  There's lots of room.  I think a
> mod like this would be 
> worthy, especially if the CoCo is just sitting
> around going unused 
> anyway.  An old gray-case CoCo 1 screams of a
> flat-panel LCD monitor 
> sitting on top, and the SuperIDE pack loaded
> down with useful software.
> 
> 
> --
> Roger Taylor



		
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