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

[John Kowalski]

James Daggett wrote:

>

>... at any instance of time the color signal can be

>broken into four components Luminace, and three chrominance

>signals R-Y, G-Y and B-Y. The three needed components for color

>transmission are as follows: 

>

>Y	luminance

>B-Y	Blue minus Luminance or Chrominace A

>R-Y	Red minus Luminance or Chrominace B

>

>The Y signal is governed by the following formula

>

>Y = 0.3*R + 0.59*G + 0.11*B

>...

>

>... Oddly enough these are the same signals that come out of the

>MC6847 VDG chip used in the Coco 1/2; Y, R-Y and B-Y.


Does that mean that we could pretty much directly hook up a CoCo 1 or 2 to a
modern component-capable TV and get a superb picture?  How complicated would
it be to do?

I remember way back people used just the Y signal for monochrome monitors.
Now we could also use the R-Y and B-Y lines for full color, right?

It's too bad CoCo 3 video isn't as convenient to convert.  Some time ago I
was interested in trying to convert the CoCo 3's RGB into component video,
but I only found complicated looking schematics for the conversion at the
time.  But it should be a fairly simple circuit, shouldn't it?

This sounds like a simpler, more elegant solution than trying to convert
CoCo 3 RGB into VGA.

                                         John Kowalski (Sock Master)
                                         http://www.axess.com/twilight/sock/