560 out of 563 Pixel Per Line?
- From: "Bryan Parkoff" <nospam@xxxxxxxxxx>
- Date: Sun, 24 Jul 2005 04:05:07 GMT
I know the fact is that Apple II is designed to position one out of 16
colors from position 0 through position 559 which it shows 560 x 192
resolution. It seems to be strange that NTSC paints one out of 16 colors
from position 0 through position 562 which it shows 563 x 192 resolution.
It seems to be extra 3 pixels in the right farther from position 559. If
you turn on monochrone, it will only show 560 x 192 resolution instead of
563 x 192 resolution.
If you use RGB monitor, it always shows 560 x 192 resolution. How can
you please explain why it is the way how NTSC uses extra 3 pixels?
In Low Resolution -- If you use "color=1 : plot 0,0" and "color=2 : plot
0,1", do you notice that dark blue color does not paint in position 0? If
you use "color=4 : plot 0,3" and "color=8 : plot 0,4", do you notice that
dark green color does not paint in position 0 and position 1 and brown color
does not paint in position 0 through position 2? Can you please explain why
NTSC does not paint while it always leave positions blacker or no color? It
is likely that NTSC can only show 3.5 pixels per one video cycle. It can
mean four dots (4 bits) equals to one pixel). How can RGB monitor display
14 pixels per one video cycle? I assume that RGB monitor does not use 3.58
MHz.
It is interesting. Please comment and ask why.
Bryan Parkoff
.
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