peteym5 Posted September 24, 2019 Report Share Posted September 24, 2019 (edited) How many use some of these undocumented or lesser known register settings for the Antic, GTIA, Pokey, chips. To create a graphics mode, effect, or sound. I know something called "PRIORITY ZERO" that "OR" effect certain player/missiles to the playfield colors. Player 0 & 1 OR with Playfield 0 & 1, Player 2 & 3 OR with Playfield 2 & 3. I usually set PRIOR to 1 to put the players on top of the play field. What was funny, a few times I forgot to set the PRIOR register and noticed something weird going on, but never thought about actually using the settings. I think there is a Tetris clone out there that takes advantage of it. Edited September 24, 2019 by peteym5 Quote Link to comment Share on other sites More sharing options...
RickR Posted September 24, 2019 Report Share Posted September 24, 2019 I know there are several revisions of Antic and GTIA. I wonder if any of these tricks were "corrected" in later revisions? Quote Link to comment Share on other sites More sharing options...
peteym5 Posted September 28, 2019 Author Report Share Posted September 28, 2019 Actually this Player/Missile priority thing worked on all Atari's since the 400/800 and did the same thing with XL/XE. I know some GTIA chips lacked the 16 color modes because of a manufacturing issue, so Atari just designated two chips as CTIA and GTIA. Raul 1 Quote Link to comment Share on other sites More sharing options...
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