I once overclocked my 1084S to get it to display a (slightly) flicker-free 640x400 with my A1200's standard, no-flicker-fixer-in-place video out.
It caused the monitor to dim somewhat (had to crank up the contrast) and I lost the bottom 4 lines on the screen - think PAL display on NTSC but not as much screen real-estate unviewable.
Hey, it worked! (And probably took years off of the monitor's life)
I think you can find the info on how to do it on aminet. Of course these days who needs to do all of that?!
