Holds a pointer to the currently used font data.

3-byte representation of the score.

Has the frame been updated?

0	No
1	Yes

Holds a copy of the last FRAMES counter.

3-byte representation of the score.

3-byte representation of the score.

Which player is currently active. $5E65

Value	Player
0	1UP
255	2UP

At the beginning of each player turn there is a delay to allow the player to be ready for play.

Value	Game Mode
128	1UP
255	2UP

The larger delay for a 2UP game is useful for swapping players controls.

Used when calculating the players position in the high score table.

Bytes(n)	Variable

There are a maximum of 6 aliens on the screen at one time, and those states are stored here in this data block.

Byte	State	Byte	State	Byte	State
0	TBC	8	TBC	16	TBC
1	TBC	9	TBC	17	TBC
2	TBC	10	TBC	18	TBC
3	TBC	11	TBC	19	TBC
4	TBC	12	TBC	20	TBC
5	TBC	13	TBC	21	TBC
6	TBC	14	TBC	22	TBC
7	TBC	15	TBC	23	TBC