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$4420: Blackboard buffers
Used by the routine at $13D5. See the blackboard buffer documentation for details of how the buffers are used.
$4420 .BYTE $00,$00,$00,$00,$00,$00 Reading Room blackboard.
$4426 .BYTE $00,$00,$00,$00,$00,$00 White Room blackboard.
$442C .BYTE $00,$00,$00,$00,$00,$00 Exam Room blackboard.
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