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Routines |
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Continues from 62750. Checks whether ERIC has jumped up to the safe or a shield, and makes it flash or unflash as appropriate.
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| 63270 | LD A,(32746) | Pick up the game mode indicator 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 | This is the 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 | ||||||
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ERIC has jumped up to the safe. Can he open it?
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| 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 | ||||||
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ERIC wrote on this blackboard. Check whether he wrote the safe combination code.
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| 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 | |||||||
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ERIC got the right combination.
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| 63330 | CALL 63668 | Add 1000 to the score and play a celebratory tune | ||||||
| 63333 | LD HL,41354 | Point HL at the attribute byte for the safe | ||||||
| 63336 | SET 7,(HL) | Alter the attribute byte of the safe in the skool attribute data to make it flash | ||||||
| 63338 | EX DE,HL | Point DE at the attribute byte for the safe | ||||||
| 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 | |||||||
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