Street Fighter Alpha 2 is traditionally played with a lever and six attack buttons. Being an arcade game, the controls were optimized for its cabinet- But any controller can be adapted to compete.
Movement
Street Fighter Alpha 2 uses eight directions for movement.
For directions, numpad notation is used, as with many fighting games. It's a simple way to describe directions as if they were numbers on a keyboard.
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Keep in mind that most if not all notations shown assume you're facing the right, so when you see an input that uses 4 and you're facing to the left, press 6 instead.