@ JLF65
Nope your mistaken. The A500 power supply was more than enough for A500 with expansions. I even used to use one to power my A1200 with expansions because the A1200 supply was so flakey.
I remember that most magazines would suggest using A500 power supply first if you were having problems with an expanded A1200.
Maybe different regions has better or power supplies, or maybe its down to different regions having different/better power grids.