| Routines

64016: Check whether MR CREAK is near a blackboard last written on by ERIC

Used by the routine at 63191. Returns with the zero flag set if MR CREAK is near a blackboard that was last written on by ERIC.
Input
H | 166 (MR CREAK)
64016 | CALL 28968 | A=identifier of the blackboard nearest to CREAK
64019 | CP 236 | Is CREAK on the top floor?
64021 | JR NZ,64027 | Jump if not
64023 | INC L | L=98 (which byte holds CREAK's x-coordinate)
64024 | BIT 6,(HL) | Return with the zero flag reset if CREAK's x-coordinate is >= 64, i.e. he's standing at the doorway of the (blackboardless) Map Room (which never happens, because CREAK never teaches in that room)
64026 | RET NZ
64027 | INC A | DE=32749 (Reading Room blackboard) or 32751 (White Room blackboard)
64028 | LD E,A
64029 | LD D,127
64031 | LD A,(DE) | A=number of the character who last wrote on this board
64032 | CP 172 | Set the zero flag if it was ERIC
64034 | RET |