Posted By
gerliczer
on 2022-02-13
01:53:23
|  Re: Is there such a thing as an interlaced picture for the +4?
@Charles: I think, I understand what those Horizontal Raster Position Register writes do. What I don't understand is why you don't understand it. You yourself linked the image of how the PAL frame is structured. Please compare the number of short and long synchronization pulses between the half frames and read all the horizontal timing legends. Row widths and timing values do scale in the image.
On a different note, those $02 $f9 or $03 $05 and other such notations baffled me. I think, you should have written raster line $0f9, $105 and so on. Mixing the Raster IRQ Enable Bit into the values did not help understanding too much.  Neither did Big Endian notation. 
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