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Routines |
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| F6AA | CP $0D | Was ENTER pressed? | ||||||||
| F6AC | JR Z,$F6D4 | Jump if so | ||||||||
| F6AE | LD B,A | Store the keypress code in B | ||||||||
| F6AF | LD H,$AC | 0xAC=ERIC | ||||||||
| F6B1 | CALL $7128 | C=0xAB (Reading Room blackboard), 0xB1 (White Room blackboard) or 0xB7 (Exam Room blackboard) | ||||||||
| F6B4 | SUB $B3 | |||||||||
| F6B6 | LD C,A | |||||||||
| F6B7 | ADD A,A | |||||||||
| F6B8 | ADD A,C | |||||||||
| F6B9 | LD C,A | |||||||||
| F6BA | LD L,A | Point HL at byte 3 of the relevant blackboard contents buffer) | ||||||||
| F6BB | LD H,$7F | |||||||||
| F6BD | BIT 7,(HL) | Jump if 4 or more characters have been written so far, or the board was dirty before ERIC started writing | ||||||||
| F6BF | JR Z,$F6CA | |||||||||
| F6C1 | SUB $04 | Point HL at the byte preceding the first byte of the relevant blackboard contents buffer | ||||||||
| F6C3 | LD L,A | |||||||||
| F6C4 | INC L | Find the next 'open' slot (which will have bit 7 set) in the blackboard contents buffer | ||||||||
| F6C5 | BIT 7,(HL) | |||||||||
| F6C7 | JR Z,$F6C4 | |||||||||
| F6C9 | LD (HL),B | Store the keypress code in the blackboard contents buffer | ||||||||
| F6CA | INC C | Restore the keypress code to A; set BC=7FAC (Reading Room blackboard), 7FB2 (White Room blackboard), or 7FB8 (Exam Room blackboard) (which holds the pixel coordinates at which ERIC should write) | ||||||||
| F6CB | LD A,B | |||||||||
| F6CC | LD B,$7F | |||||||||
| F6CE | CALL $715F | Write a single character on the blackboard | ||||||||
| F6D1 | JP $F693 | Move ERIC's arm | ||||||||
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ERIC has finished writing on the board (ENTER was pressed).
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| F6D4 | RES 5,(HL) | Reset bit 5 of ERIC's status flags at 7FFB to indicate that ERIC has finished writing on the board | ||||||||
| F6D6 | RET | Return to the main loop | ||||||||
| Prev: F650 | Up: Map | Next: F6D7 |