. . . . "Each volume has 5 to 7 games; all of these were ported from the original arcade version's source code ??? some of the games such as Galaga and Pac-Man allowed for an alternative screen mode to compensate for the lack of vertical monitor, whereby the scoreboard was located on the left of the screen, or rotated the image 90 degrees if the user possessed a vertical monitor or was willing to risk plac" .