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Routines |
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Used by the routine at 7D84. A teacher is standing at the doorway of a classroom, ready to tell the kids to sit down; this routine checks whether the teacher is MR CREAK, and if it is, makes him reveal his safe combination letter if his birth year has been written on the blackboard by ERIC, and ERIC has not yet opened the safe.
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| F6D7 | CALL $F8F6 | Return unless we're dealing with CREAK and ERIC has not yet opened the safe | ||||||||
| F6DA | RET C | |||||||||
| F6DB | CALL $FA10 | Return unless CREAK is near a blackboard last written on by ERIC | ||||||||
| F6DE | RET NZ | |||||||||
| F6DF | LD A,E | A=0x38 (Reading Room blackboard) or 0x3A (White Room blackboard) | ||||||||
| F6E0 | SUB $B5 | |||||||||
| F6E2 | PUSH HL | Save CREAK's character number | ||||||||
| F6E3 | LD L,A | HL=7FA8 (Reading Room blackboard contents buffer) or 7FAE (White Room blackboard contents buffer) | ||||||||
| F6E4 | ADD A,A | |||||||||
| F6E5 | ADD A,L | |||||||||
| F6E6 | NOP | |||||||||
| F6E7 | LD L,A | |||||||||
| F6E8 | LD H,D | |||||||||
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Check whether CREAK's birth year has been written on the board.
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| F6E9 | LD E,$9B | DE=7F9B (which holds CREAK's year of birth) | ||||||||
| F6EB | LD B,$04 | There are 4 digits in CREAK's year of birth | ||||||||
| F6ED | LD A,(DE) | A=digit from CREAK's year of birth | ||||||||
| F6EE | INC E | Move DE along to the next digit | ||||||||
| F6EF | CP (HL) | Compare the digit with the character written on the board | ||||||||
| F6F0 | JR NZ,$F6FA | Jump if they don't match | ||||||||
| F6F2 | INC L | Move to the next character written on the board | ||||||||
| F6F3 | DJNZ $F6ED | Jump back until all 4 digits have been checked | ||||||||
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The first four characters written on the board by ERIC match the digits in MR CREAK's year of birth.
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| F6F5 | POP HL | Restore CREAK's character number (0xA6) to H | ||||||||
| F6F6 | PUSH HL | Save it again | ||||||||
| F6F7 | CALL $F970 | Reveal CREAK's safe combination letter | ||||||||
| F6FA | POP HL | Restore CREAK's character number (0xA6) to H | ||||||||
| F6FB | LD BC,$F1C1 | Set BC to F1C1 (SILENCE! OR I'LL CANE THE LOT OF YOU) before returning | ||||||||
| F6FE | RET | |||||||||
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