Routines
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7EF1: Make BOY WANDER write on a blackboard
Used by BOY WANDER's command lists 0x20, 0x2E, 0x32, 0x36 and 0x38. Makes BOY WANDER write on the blackboard he's standing next to unless a certain event has already happened or the board is dirty.
Input
H 0xCE (BOY WANDER)
7EF1 CALL $627D Collect the event identifier parameter from the command list
7EF4 CALL $7C8F Check whether the event (the arrival of a teacher or the end of the lesson) has happened
7EF7 LD BC,$6880 Redirect control to the routine at 6880 (write on board) if the event has not happened, then return to 7EFD (below)
7EFA CALL Z,$639F
7EFD JP $638C Move to the next command in the command list
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