This patch is a modification of LandonRay's Final Fantasy IX Unleashed 2.0.9 mod.
You can find more information on LandonRay's mod here : http://ngplus.net/InsaneDifficultyArchive/www.insanedifficulty.com/board/index2711.html?/topic/2652-final-fantasy-ix-unleashed-v209/
My patch removes all sources of AP from the game which means that you can't learn any ability.
The only abilities and support abilities that you can use are from your current equipment.
In the original version of the game, some items that could be bought became permanently missable or available in limited quantity after you reached a certain point in the game.
These items have all been added to shops that are still open at the end of the game.
Here is the list of added items :
Treno (Disc 3-4)
Daguerreo (Disc 4)
Black Mage Village (Disc 4)
Added items to shops
This patch can only be applied on the original PSX NTSC-U version of the game, it contains both Unleashed 2.0.9 and the No AP mod.
Download link : https://www.mediafire.com/file/ju8sahlnxnehjt9/FFIX+Unleashed+2.0.9+No+AP.zip
To apply the patch you can use ppf-o-matic : http://ngplus.net/index.php?/files/file/24-ppf-o-matic-psx-game-patching-tool/