Originally Posted by
98PaceCar
Just hold down the right mouse button when you boot up and a menu will come up that lets you select NTSC or PAL. Some games only run in PAL, some only in NTSC. I used to always run PAL just because of the slightly bigger workbench.
On the 500, you have to do an Agnus upgrade which involves a few trace mods. Not necessary on the 1200 though.
Depending on which version of the OS you have, you can also set the video mode from Workbench, but it may or may not work in games.