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Forums > CSDb Discussions > VIC and the odd/even fields
2007-06-07 15:00
Oswald

Registered: Apr 2002
Posts: 5086
VIC and the odd/even fields

okay this is getting confusing for me now. in another thread on lemon64 groepaz says that the vic does always display the same field, but it doesnt matter if its odd or even, and it lights up both the odd/even lines.

some1 can tell me:

- does vic use odd or even or dontcare lines?
- what does the term field mean from the tv electronics viewpoint?
- how does the vic only light up the odd (forex.) lines on the tv screen, and a little bit from the other ones?
- are there really 2 modes in the tv electronics for odd / even fields
- why does computer graphics flicker a hell more lot while "normal" tv screens looks as steady as my ass?
 
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2007-06-12 11:22
Oswald

Registered: Apr 2002
Posts: 5086
Quote: @oswald: any more loose ends?

all my ends are on loose, I simply gave up.
2007-06-12 16:11
Graham
Account closed

Registered: Dec 2002
Posts: 990
@Magervalp:

The problem is that the deinterlacing does not work. Some movies are 25 fps, some are 50 fps, and sometimes it's even 25 and 50 fps mixed. So even IF you have a deinterlacer, the better movies and animations (50 fps) will look jerky.
2007-06-13 03:47
ChristopherJam

Registered: Aug 2004
Posts: 1408
Well, unless it's got some kind of motion prediction, a 50Hz scroll will ghost as badly on a 100Hz display as a 25Hz scroll does on a 50.

I saw someone trying to play some Amiga games on a 100Hz TV once. It wasn't pretty.
2007-06-13 06:27
MagerValp

Registered: Dec 2001
Posts: 1074
Of course, deinterlacing is a complicated process, and only ever works most of the time, never always. High end displays do a good job with natural images. They are completely unsuited for displaying computer images though.
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