Ummm no... I have many different Power supplies here... there is one which is 250 mAmps, I have a 500 mAmps too... and somewhere i have a 1000 mA but I do not want to use it with my Neo Geo as it does not show what polarity it comes with.
Here is a picture of a NeoGeo power supply (5volts kind)http://cgi.ca.ebay.com/aw-cgi/eBayISAPI.dll?ViewItem&item=530345869 and
it clearly shows that it is a 3Amp power supply. The manual that comes with my NeoGeo says its needs 9v but it doesnt specify amount of amperage needed.
Nostromo