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Routines |
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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 | Point HL at 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 | Point HL at the byte preceding the first byte of the relevant blackboard contents buffer | |||||||||
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 | |||||||||
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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