on Most 108x monitors you will find some sort of happy fine-tuning on the vert so that when you bounce from NTSC/PAL, it will lock.
Now you might say it flickers and color problems crop up, esp in NON-rgb (composite video), but I found it to be fine for pal games and demos that would just refuse to run otherwise or weren't NTSC_fixed.
The best monitor I have seen for this is the Toshiba TIMM 20" RGB multiscan monitor. Of course it's not made anymore and not may people sell them.
