Re: Making the ][+ better

[Rubywand <rubywand@swbell.net>]

"Michael J. Mahon" writes ...
> 
> Rubywand wrote:
> 
 ....
> >
> >     The catch is that there seems to be no way for the Apple II to turn OFF
> >color in mid-screen. It looks like once a composite color monitor gets the
> >Color Burst signal, color is ON for the entire frame.
> 
> Color monitors are built to detect the presence of color burst to signal the
> presence of a chroma subcarrier.  The time constant of the chroma oscillator
> controlled by the burst is relatively long (so that it is stable within a
> frame),
> and the detection mechanism also has a time constant which is on the
> order of one or more frames.  There is no video standard for frames that
> are encoded partially in color and partially in monochrome.
> 
 ....

     Thanks for the information. Wish I had known that back in 1982 when I spent
a few days trying out circuits to for-sure kill the Color Burst signal for Text
mode inside the Apple II!


Rubywand