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Re:A Long Adventure: Repairing Ultra-Rare NTSC Amiga Ultima 6 by gryson on Monday April 08, 2019 @10:59AM (#19605770)
The author does state "I could play the game on my A1000 Phoenix in PAL mode, but I really wanted the NTSC version."

The problem with running it in PAL mode is that it won't run at the correct speed (I assume). Most of the time when a game was converted to run on a PAL system, developers didn't adjust the game to take into consideration the slower framerate (50 Hz for PAL vs. 60 Hz for NTSC). This is very noticeable on action-based games like Sonic the Hedgehog, where if you are used to the NTSC version, playing the PAL version makes it feel like Sonic's feet are glued to the ground (not to mention how off the music sounds!).

Comparison video: https://www.youtube.com/watch?v=nSSYo0npMhA

Re:A Long Adventure: Repairing Ultra-Rare NTSC Amiga Ultima 6 by tom_ on Monday April 08, 2019 @11:13AM (#19605903)
I wonder what percentage of Amiga games were designed for 60Hz first! My bet is that it was not high...

(This is also probably not the sort of game where it's a big deal.)

Re:A Long Adventure: Repairing Ultra-Rare NTSC Amiga Ultima 6 by gryson on Monday April 08, 2019 @12:19PM (#19606566)
According to this comment, it seems it is noticeable, though: "The speedup can be significant. On my stock A1200 Ultima 6 was annoyingly slow in PAL mode but much more playable in NTSC mode."

http://www.lemonamiga.com/forum/viewtopic.php?p=129566&sid=d...