Is it possible to use a high-res screenmode on a pal tv without flickering and without flickerfixer?
HiRes? Sure... 640x256 is considered "HiRes" though.
Interlaced (640x512), which is probably what you are meaning, will flash/flicker, though. Hardware design. The best you can do is try to pick low-contrast colors for your workbench. Dark blue, with a mid-blue text doesn't flicker too bad, but if it's not a perfect picture on a TV, it may be very hard to read, as not enough contrast....... Experimenting with colors is your only hope, unless you want to buy it a flicker-free monitor. (not 1084 series -- the 1950/60 series)