The A1200's power supply was notorious for not providing a decent amount of power (~21w) for more than a lightly expanded A1200. Even though the A500 power supply was marginally better, you could still suffer random crashes and failures because more power was simply required. The Goliath is an adapted PC PSU housed in an external case with an appropriate connector for attaching to your A1200 and is capable of providing far more power. As the A1200 uses the same power connector as the A500 series and the A600, the Goliath should be compatible with these machines aswell. It is not known if a version of the Goliath was produced for use in the US, because Europe has a (~230/~240V) power grid.