Posted By
Mad
on 2022-02-11
08:36:40
|  Re: Is there such a thing as an interlaced picture for the +4?
http://martin.hinner.info/vga/pal.html
Some write up to Pal. The last paragraph features the Pal hack "all" computers and game consoles use.. I was of course totally wrong by saying that a 0.5 pixel shift is needed, that's of course distinguished by the field, as stated already..
Nice 233c by Litwr..
btw.. agree to Charles with seeing more resolution on these TV screenshots. Even there is this typical interlace x shift halve line after halve line (looks like missing deinterlacing (on moving pictures) or something), at least it seems so.. You can ?clearly? see that the pixels on these places have doubled the y resolution. Maybe it's this "It alters the horizontal scanning ($ff1e) a few lines before frame switching" for odd/even field select stuff (wild guess)???
edit: judging from the synchronization diagrams for the fields in the link above, it seems to be impossible to generate odd/even addressing via ff1e tricks.. :( Maybe I am wrong on that, but it really looks like it's impossible..
Are the around 8 pal vsynch rasterlines also "rooted" in the ted and is it thus modifiable by registers on the right rasterlines? If yes, maybe it's doable to change the refresh behaviour [odd/even fields] (with ff1e/ff1d).. Or??
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