If you have the ECS chipset or newer you can use
TinyPalNtsc but I wouldn't hold out a lot of hope for the A4000 unless you use
Degrader or
Tude to simulate ECS for the older games.
-edit-
If you have a PAL system running on a US power supply then you don't have to mess with all the previous stuff. It will run on a PAL system without question.
Make sure you have a monitor capable of syncing at 50 Hz vertically however.
