Le 2015-10-27 03:23, Le_Forgeron a écrit :
> Le 26/10/2015 23:43, Orchid Win7 v1 a écrit :
>> I've always wanted to know... why is the framebuffer arranged so
>> weirdly? Like, as you load a picture file, rather than filling from top
>> to bottom, it seems to fill every Nth line...
>
> Probably because Pal is an interleaved image: there is odd and even
> frames. It was probably easier for the electronic in charge of
> generating the lines in that order instead of obvious linear order.

It's because the phosphorescent particles on the CRT face would dim too 
much by the time the scanning electron beam came back to tickle them 
back to life.  By having an interleaved image, the flicker was less 
apparent.


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/*Francois Labreque*/#local a=x+y;#local b=x+a;#local c=a+b;#macro P(F//
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/*        @        */{P(0,a)P(a,b)P(b,c)P(2*a,2*b)P(2*b,b+c)P(b+c,<2,3>)
/*   gmail.com     */}camera{orthographic location<6,1.25,-6>look_at a }

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