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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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MagerValp
Registered: Dec 2001
Posts: 1074 |
Quote: the wiki is wrong :) the chroma signal is half resolution to save bandwidth. the averaging thing is true however, the current scanline chroma will always be a mix of 1 third of the previous scanline chroma and 2/3 of the current scanline chroma. (no, its not like this, its more complicated, but i forgot =D)
Please don't bring chroma mixing into this already confused discussion :P
(and it's 50:50 mixing btw, though technically it varies from CRT to CRT, and it has half the *horizontal* resolution)
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Oswald
Registered: Apr 2002
Posts: 5086 |
alrighty its nor odd nor even scanlines still there must be in some (to me unknown) form every 2nd line skipped. isnt it? on some TV's you can stretch/shrink the screen horizontally / vertically. but neither of that messes up the display. so when adjusting the vertical size the half lines must be still there in some timed form. also the outside signal can tell the tv wether its an odd or even field how does that happen ? |
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chatGPZ
Registered: Dec 2001
Posts: 11360 |
Quote:also the outside signal can tell the tv wether its an odd or even field how does that happen ?
jackasser already said how that works, wether the next field is odd or even is determined by the length of the last scanline. (and again, this is why/how the "true" interlace on the c128 works - it manipulates the length of that very scanline) |
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Oswald
Registered: Apr 2002
Posts: 5086 |
why can then magervalp say that the vic's output is nor odd nor even ? it must be either this or that!! |
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chatGPZ
Registered: Dec 2001
Posts: 11360 |
Quote:why can then magervalp say that the vic's output is nor odd nor even ? it must be either this or that!!
no, since both fields are the *same*, there is no "odd" or "even" field technically :=) |
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Oswald
Registered: Apr 2002
Posts: 5086 |
sdglékjasflékgjsdfkljglasfjkglsdfkglsdfg
*pulls all hair out*
but its either all odd or all even no matter what. the last scanline clearly determines that. |
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chatGPZ
Registered: Dec 2001
Posts: 11360 |
Quote:but its either all odd or all even no matter what. the last scanline clearly determines that.
yes :=) |
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Oswald
Registered: Apr 2002
Posts: 5086 |
SIGH
then why do ppl always say it neither odd neither even when its clearly one of them. |
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chatGPZ
Registered: Dec 2001
Posts: 11360 |
its just terminology.... technicans only refer to odd and even fields when there is actually interlace taking place. |
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Oswald
Registered: Apr 2002
Posts: 5086 |
.. making something incredibly simple concept incredibly hard to understand. |
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