Re: How I got interested in the Apple ][...

[heuser.marcus@freenet.de]

On Dec 18, 10:28 am, Linards Ticmanis <ticma...@gmx.de> wrote:
>
> Well, maybe "shake" is not the right word. I get this vertically moving
> moire effect on the left and right border of colored areas, caused (as I
> assume) by a beating wave ("Schwebung" in German, I'm not sure this
> translation is correct) created from the superposition of the frequency
> of the two quartzes.
>
> I can minimize it by tuning L7 (3.56 MHz filter) on the PAL IIe board
> and get it to move as fast as possible by very carefully tuning C112
> (PAL color burst frequency), so that I don't see it as long as I give it
> a fixed stare. But when I move my eyes up or down a bit it's still very
> visible. Since I got this with both a PAL II+ encoder board and a PAL
> IIe, and also with two very different TV sets (both 50Hz CRT though), I
> thought it was pretty universal. Though I guess you wouldn't have it on
> a LCD TV since it moves too fast.


I believe I know what you mean. I also played with C112 and found an
acceptable setting - especially compared with other
systems (C64 and Ataris come to mind which can have some
horrific quality issues).

On the other hand I compared two NTSC IIe mainboards and
one "International NTSC" (converted to "US NTSC") and got
slightly different video output - color and contrast were notably
different, as was the "sharpness" of the picture.
Those differences were minimal, however, compared to the
video output of a PAL IIe.

bye
Marcus