Game status buffer
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54019: Player Shooting
Two 54019 DEFB 0 Defaults to $00, holds $01 when the player is pressing "2".
Three 54020 DEFB 0 Defaults to $00, holds $01 when the player is pressing "3".
One 54021 DEFB 0 Defaults to $00, holds $01 when the player is pressing "1".
Controls_Byte 54022 DEFB 17 Holds the controls in one byte.
Value Bits Door
16 00010000 Door 2
17 00010001 Door 3
18 00010010 Door 1
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