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28658: Collect information about blackboard
Used by the routine at 26639 to collect information about the blackboard that is going to be wiped by a teacher. Returns with B holding the blackboard identifier (the LSB of 32596, 32602, 32608, 32614 or 32620), and DE holding the coordinates of the top left-hand square of the board.
H Character number of teacher interested in the board (201-204)
28658 LD A,12 Change the instruction at 26476 to ADD A,12
28660 LD (26477),A
28663 CALL 26453 Collect information about the blackboard within 12 spaces of the teacher
28666 LD A,4 Change the instruction at 26476 back to ADD A,4
28668 LD (26477),A
28671 RET