Not sure if you meant the flicker or actual refresh rate. NTSC is 60Hz, PAL is 50. You cannot adjust that. The Commodore 2002 monitor will handle NTSC and PAL just fine (though it will not auto adjust the screen for it in PAL like the older boxy 1084 series). Regarding the flicker you see, that is normal! You cannot fix it and the only thing you can do in WB is use different colors to minimize it. The Amiga handled hi res using interlace. 400 lines or more verticle. So any low res modes (200 or 256 lines) are normal.
The only way to get rid of it is to purchase a VGA Flicker fixer and use a PC monitor! The FF costs like $100. lol Just be nostalgic and use the C=2002 the way it was meant to be!
