Game status buffer
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D303: Player Shooting
Two D303 DEFB $00 Defaults to $00, holds $01 when the player is pressing "2".
Three D304 DEFB $00 Defaults to $00, holds $01 when the player is pressing "3".
One D305 DEFB $00 Defaults to $00, holds $01 when the player is pressing "1".
Controls_Byte D306 DEFB $11 Holds the controls in one byte.
Value Bits Door
10 00010000 Door 2
11 00010001 Door 3
12 00010010 Door 1
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