Used by the routine at 24380. Can be either;

• 1
• 2
• 3

This represents which background is shown.

Buffer that holds the currently processed background data depending on the background reference value.

Background_Reference	Background Data
1	Background_1_Addresses
2	Background_2_Addresses
3	Background_3_Addresses

Populated from one of 24403, 24418 or 24433.

Points to the address containing the player 1 control address mappings.

When player 1 is using the keyboard, these byte pairs will be populated with the corresponding keys.

Points to the address containing the player 2 control address mappings.

When player 2 is using the keyboard, these byte pairs will be populated with the corresponding keys.

See Key_Data for key mappings.

See Key_Data for key mappings.

See Key_Data for key mappings.

See Key_Data for key mappings.