instructions a b -- a+b ADD -> Pushes a + b (byte) to the stack ADDw -> Pushes a + b (word) to the stack ADDx -> Pushes a + x (byte) to the stack ADDxw -> Pushes a + xw (word) to the stack ADDy -> Pushes a + y (byte) to the stack ADDyw -> Pushes a + yw (word) to the stack ADDxy -> Pushes x + y (byte) to the stack ADDxyw -> Pushes xw + yw (word) to the stack