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Routines |
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| A | ASCII code of last keypress |
| HL | 32763 (ERIC's status flags) |
| 63146 | CP 13 | Was ENTER pressed? |
| 63148 | JR Z,63188 | Jump if so |
| 63150 | LD B,A | Store the keypress code in B |
| 63151 | LD H,172 | 172=ERIC |
| 63153 | CALL 28968 | C=171 (Reading Room blackboard), 177 (White Room blackboard) or 183 (Exam Room blackboard) |
| 63156 | SUB 179 | |
| 63158 | LD C,A | |
| 63159 | ADD A,A | |
| 63160 | ADD A,C | |
| 63161 | LD C,A | |
| 63162 | LD L,A | HL=32683, 32689 or 32695 (byte 3 of the relevant blackboard contents buffer) |
| 63163 | LD H,127 | |
| 63165 | BIT 7,(HL) | Jump if 4 or more characters have been written so far, or the board was dirty before ERIC started writing |
| 63167 | JR Z,63178 | |
| 63169 | SUB 4 | HL=32679 (Reading Room blackboard), 32685 (White Room blackboard), or 32691 (Exam Room blackboard) |
| 63171 | LD L,A | |
| 63172 | INC L | Find the next "open" slot (which will have bit 7 set) in the blackboard contents buffer |
| 63173 | BIT 7,(HL) | |
| 63175 | JR Z,63172 | |
| 63177 | LD (HL),B | Store the keypress code in the blackboard contents buffer |
| 63178 | INC C | Restore the keypress code to A; set BC=32684 (Reading Room blackboard), 32690 (White Room blackboard), or 32696 (Exam Room blackboard) (which holds the pixel coordinates at which ERIC should write) |
| 63179 | LD A,B | |
| 63180 | LD B,127 | |
| 63182 | CALL 29023 | Write a single character on the blackboard |
| 63185 | JP 63123 | Move ERIC's arm |
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ERIC has finished writing on the board (ENTER was pressed).
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| 63188 | RES 5,(HL) | Reset bit 5 of ERIC's status flags at 32763 to indicate that ERIC has finished writing on the board |
| 63190 | RET | Return to the main loop |
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