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Routines |
DE | Coordinates of ERIC's hand |
63270 | LD A,(32746) | Pick up the shield status from 32746 |
63273 | CP 2 | Are all the shields flashing? |
63275 | JP NZ,28130 | Jump if not (to check whether ERIC touched a shield) |
63278 | LD A,D | A=y-coordinate of ERIC's hand |
63279 | CP 161 | 161=y-coordinate of the spot just under the safe in the staff room |
63281 | RET NZ | Return if ERIC is not on the middle floor |
63282 | LD A,E | A=x-coordinate of ERIC's hand |
63283 | CP 10 | Has ERIC jumped up to the safe? |
63285 | RET NZ | Return if not |
63286 | LD HL,32749 | 32749 holds the number of the character who last wrote on the Reading Room blackboard |
63289 | LD DE,32680 | 32680=Reading Room blackboard contents buffer |
63292 | LD C,3 | There are 3 blackboards |
63294 | LD A,(HL) | A=number of the character who last wrote on this board |
63295 | INC HL | Move HL along to the next blackboard |
63296 | INC HL | |
63297 | CP 172 | Did ERIC write on this blackboard? |
63299 | JR NZ,63322 | Jump if not |
63301 | PUSH HL | |
63302 | LD L,159 | HL=32671 (which holds the safe combination code) |
63304 | LD B,4 | There are 4 characters in the safe combination code |
63306 | PUSH DE | Save the pointer to the blackboard contents buffer |
63307 | LD A,(DE) | A=character written on the blackboard by ERIC |
63308 | AND 95 | Convert to upper case |
63310 | INC E | Move DE along to the next character on the blackboard |
63311 | CP (HL) | Does the character on the blackboard match a safe combination letter? |
63312 | JR NZ,63318 | Jump if not |
63314 | INC L | Move to the next letter of the safe combination code |
63315 | DJNZ 63307 | Jump back until all four letters have been checked |
63317 | XOR A | Set the zero flag to indicate a match |
63318 | POP DE | Restore the blackboard contents buffer pointer to DE |
63319 | POP HL | |
63320 | JR Z,63330 | Jump if ERIC got the right combination |
63322 | LD A,E | Point DE at the next blackboard contents buffer (32686 or 32692) |
63323 | ADD A,6 | |
63325 | LD E,A | |
63326 | DEC C | Decrease the blackboard counter |
63327 | JR NZ,63294 | Jump back until all three blackboards have been checked |
63329 | RET |
63330 | CALL 63668 | Add 1000 to the score and play a celebratory tune |
63333 | LD HL,41354 | 41354 holds the attribute byte for the safe |
63336 | SET 7,(HL) | Alter the attribute byte of the safe to make it flash |
63338 | EX DE,HL | DE=41354 |
63339 | CALL 62674 | Get the attribute file address of the safe in HL |
63342 | RET C | Return if the safe is off-screen (unlikely!) |
63343 | SET 7,(HL) | Adjust the on-screen attribute byte of the safe to make it flash |
63345 | RET |