[Coco] CoCo 1/2 to VGA?

[John W. Linville]

On Thu, Mar 07, 2013 at 12:43:13AM -0600, camillus Blockx wrote:
> Well the rf modulater works with composite video. You can take that signal
> after amplified it and end it to 75 Ohm to feed your a/v device. Look on
> google to find schematic for amp. Know for shure there is one that works on
> coco 2. Used it on my coco 2 myself.

That is true on the CoCo1, but not really true on the CoCo2.  On the
CoCo2, the Y, R-Y, and B-Y signals from the 6847 go to the modulator.
The MC1372 inside the modulator combines them into the NTSC RF signal.

The CoCo1 uses an MC1372 as well, but only to generate NTSC composite
video which is then fed to a separate RF modulator.  That is why it
is easier to convert a CoCo1 to composite video out than it is to do
so for a CoCo2.

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville at tuxdriver.com			might be all we have.  Be ready.