Re: RGB Card Question

[bieling@terra.es]

mdj wrote:
> Jorge ChB wrote:
>
> > You can tell if a line has to be interpreted as color/B&W on a line by
> > line basis by watching for the presence of the color burst at the
> > beginning of *each* line...
>
> ??
>
> The colour burst is omnipresent in graphics modes. Even mixed mode with
> 4 lines of text you get the fringy colour bust issues.

I thought the burst was shutdown while showing text,
but it looks like it's shutdown while in TEXT mode, which is not the
same thing... :-(

> The IIe/IIc disable colour burst in text mode by shunting the signal,
> and even then you can get leakage will will be enough to trip colour
> decoding on many televisions.

Yep, but I was thinking about a way to discern, by watching the signals
available on a IIc's video expansion port, if the next line coming out
was to be interpreted as color (the burst came on) or b&w (monochrome,
the burst is off)...