Re: IGS Monitor from Composite Source?

[mdj <mdj.mdj@gmail.com>]

On May 6, 2:39 pm, demp...@actrix.gen.nz (David Empson) wrote:
> Steve ][ <s...@hotmail.com> wrote:
> > Just wondering if anyone knows of a way to take a "composite RCA"
> > video signal and convert it into something that would display on the
> > IIGS Analog RGC monitor.
>
> I assume you meant Analog RGB and that was just a typo.
>
> In theory, yes. You would need a fancy video conversion box which
> decoded the composite signal and produced an RGB signal for the monitor.
> This would be an analog process and the signal quality would be much
> lower than a genuine Analog RGB source, and probably worse than looking
> at the same signal on a good quality composite colour monitor.

How so? A composite colour monitor has to decode the composite signal
to RGB to display it so I don't see how it would look any worse, other
than the higher-fidelity of most RGB displays.

> I don't know if any such box exists. It would be simpler than a
> hypothetical "composite to VGA" converter, because it doesn't need to do
> a frequency conversion as well.

There are plenty of chips out there that'll decode NTSC into component
forms. I doubt you'd need a lot in the way of support circuitry to
drive it.

If your intention is to convert Apple II composite to RGB that might
be a little trickier, as some modern decoders tend to be confused by
the quasi-NTSC nature of the Apple II video signal.

Matt