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-===== Bally Professional Arcade =====
-This documentation describes the Bally Home Videogame System, otherwise known as the Bally Professional Arcade, Bally Home Computer, or Bally Astrocade.
-{{bally_ad.png}}
-The system is divided into six primary subsections based upon their functions:
-  * The [[User Program Interface]] allows cartridges to reference the [[upi conventions|system routines]] through a standard interface, including an [[upi conventions#the interpreter|interpreter]].
-  * The [[Screen Handler]] provides routines for creating screen images, including facilities for initialization, pattern, and character display, coordinate conversion, and [[screen vectoring routines|object vectoring]].
-  * The [[Human Interface]] reads [[player input|keypad / control handle inputs]] and handles game selection and options.
-  * The [[Interrupt Scheduler]] handles system timers and counters.
-  * The [[Music]] routines handle music playback.
-  * The [[Math Routines|Math]] routines manipulate floating BCD and decimal numbers, transfer data, and halt cartridge execution.
-----
-**NOTE:** The Nutting Manual lists slightly different system subsections on its opening page, within the system routine descriptions, and in the operating system source listing. The [[start|Better Bally Book]] favors the subsections organized in the source listing (pp. 6–7) both due to their logical organization and due to their complete listing of otherwise undocumented system routines.