With an NTSC A600 you might well want to switch modes, in the sense of forcing the A600 to PAL mode, when booting PAL games. You can hold both mouse buttons to get to the boot menu then press a key to toggle between 50Hz and 60Hz. There are also various utilities like Degrader, AmigaToPAL etc. that could help.
Your TV should automatically handle both modes, increasing the vertical size in 60Hz mode.
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