I just managed to get my hands on a beautiful Atari 800XL for a song =).
My problem is that the power supply seems to be broken so I thought I'd just replace it with a generic one.
Now for the problem, I can't seem to get a straight answer about what voltage an mA I need. I get different answers everywhere. On the power supply I've got it says:
Input: 220V (Which is nice since that's what we have in our power outlets over here=))
Output: 6V DC 300 mA