Service Mode

Change various game settings by moving the arrow to the desired option with the arrow keys and press Enter to toggle:
Window Scale - Changes the magnification of the window. Options range from x1 to x4. (Default: x2)
Fullscreen - Toggles fullscreen mode. (Default: On)
Screen Rotation - Toggle the rotation of the game screen to support vertical displays. (Default: Off)
Key Config - Configures how the game is controlled. (see "Key Configuration")
Key Reminder - Toggles the display of keyboard or controller assignments for [Insert Coin], [1P Start], [2P Start] and [Service] on the title screen to help new players. Toggle this option off for a more authentic arcade experience. (Default: Keys)
Music - Toggles background music on or off. (Default: On)
Sound - Toggles sound effects on or off. (Default: On)
Factory Reset - Resets all settings back to their defaults and erases high scores.
Online Help - Opens this online manual in the default web browser.
Credits - Displays the game credits.
Exit - Return to title screen.
All settings are saved between sessions.