| Game status buffer

80BC: Remaining air supply

Initialised (always to 0x3F in practice) and used by the routine at 8684, updated by the routine at 8A3C, and also used by the routine at 9028. Its value ranges from 0x24 to 0x3F and is actually the LSB of the display file address for the cell at the right end of the air bar. The amount of air to draw in this cell is determined by the value of the game clock at 80BD.
80BC | DEFB $00 |