PAL & NTSC. PAL and NTSC were written on an A500 (KS1.3) with a Fatter Agnus. I have also tested them on my new A1200 and they work fine. Thus I assume they will work on any machine with a Fatter Agnus or better. PAL will switch to a 50Hz display i.e. 256 vertical scan lines. NTSC will switch to a 60Hz display i.e. 200 vertical scan lines. These are very small and could be used to run OS-friendly software from opposite side of the dispaly world from where you are. They do not chech to see if a Fatter Agnus is present, if one is not present, then running them will have no effect besides producing a credit to moi. COST: $0.00. Both are completely Public Domain. HARDWARE REQUIREMENTS: Fatter Agnus or better. AUTHOR: Paul O'Flynn, Ballinveltig, Carrigrohane, Co. Cork, Ireland.