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No expert but kickstart 1.2 included timer.device in rom that checked the Pal/Ntsc status of the amiga and updated timing and screens accordingly. 1.1,1.0 didn't have this and seperate PAL and NTSC versions were released.
On WinUAE, if IK+ is loaded in A500 PAL and then switched to NTSC while running the game goes into race-mode hyper fast. I guess WinUAE settings are already established.
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