Re: RGB Card Question

["sicklittlemonkey" <Nick.Westgate@gmail.com>]

Michael J. Mahon wrote:
> bieling@terra.es wrote:
> >>>>>Like for example ?
> >>>>>I ran the program above and nothing "bizarre" came on the screen.
> >>>>
> >>>>I didn't say something bizarre *would* happen, only that it *could*
> >>>>happen, because it is completely outside the NTSC specification.
> >>>
> >>>Yep, the most "bizarre" thing that could happen is a switch from color
> >>>to monochrome, or viceversa...
> >>
> >>No--actually, loss of color sync could result in some "rainbow"
> >>displays for part of a frame as the monitor color reference
> >>oscillator tries to get back into phase lock.
> >>
> >>The "trajectory" of phase lock during reacquisition can be
> >>chaotic, so, with the "right" timing, wierdness can happen.
> >>
> >>Some monitors may incorporate circuitry to detect solid phase
> >>lock of the reference and disable chroma processing until it
> >>is achieved, but I'd be surprised to find this in non-professional
> >>monitors.
>
> Yes, it takes several lines to achieve stable phase lock.

Not that the snippet that Jorge posted is basically what the Money
Muchers intro screen does, and my widescreen digital LCD TV (which even
has VGA in) does go a bit bizarre with that.

You can see what it's trying to do, and some of the text is in
monocrome, but some of the lores colours are pretty strange. Regions of
B&W and colour flicker in and out of sync. Definitely
monitor-dependant, and not what Bob Bishop intended. ;-)

Cheers,
Nick.