Name that game?

Can anyone tell me the name of the game, circa 1980, that involves launching a missile off of a moveable platform and steering it up to hit one of the numerous Space-Invader-type saucers that passes over above. I know Mame supports it 'cos I had it once but must have deleted it. It's a very simple game - but that suits me because I can't cope with anything more than left, right, and fire.

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