From the article: "In general, pressing the 5 key will insert coins, 1 and 2 will start 1 or 2 player games, and the arrow and spacebar keys will control the ga

From the article: "In general, pressing the 5 key will insert coins, 1 and 2 will start 1 or 2 player games, and the arrow and spacebar keys will control the games themselves."