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7F54: Buffer for the Blue Room blackboard
Used by the routines at 5E45, 5E6F, 6791, 680F and 6880.
7F54 DEFB $00 Next clean pixel column (0-127)
7F55 DEFB $00 Number of the character who last wrote on the board
7F56 DEFS $04 Characters written by ERIC
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