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Routines |
Prev: 24476 | Up: Map | Next: 24560 |
Used by the routine at 62910. The main entry point is used to play the theme tune.
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24477 | LD HL,23611 | Reset bit 5 at 23611, clearing the record of any keypresses before the tune starts |
24480 | RES 5,(HL) | |
24482 | LD HL,56384 | The theme tune data starts at 56385 |
This entry point is used by the routine at 23907 with HL=56364-1 (the up-a-year tune data starts at 56364).
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24485 | DI | Disable interrupts |
24486 | INC HL | Point HL at the next tune datum |
24487 | LD A,(HL) | Pick it up |
24488 | INC A | Is it an end-of-section marker? |
24489 | JR NZ,24496 | Jump if not |
24491 | INC HL | Point HL at the first datum in the next section |
24492 | LD A,(HL) | |
24493 | INC HL | |
24494 | LD H,(HL) | |
24495 | LD L,A | |
24496 | LD A,(HL) | A=tune datum |
24497 | AND A | Have we reached the end of the tune? |
24498 | JP Z,62169 | Jump if so |
A non-zero tune datum has been found, meaning the tune is not finished yet.
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24501 | PUSH HL | Save the tune data table pointer |
24502 | RRCA | Set the carry flag if we should pause briefly |
24503 | LD B,A | Copy the right-rotated tune datum to B |
24504 | JR NC,24514 | Jump unless we should pause briefly |
24506 | LD D,15 | Pause briefly |
24508 | DEC E | |
24509 | JR NZ,24508 | |
24511 | DEC D | |
24512 | JR NZ,24508 | |
24514 | AND 7 | 0<=A<=7 |
24516 | LD C,A | C=border colour for this note |
24517 | ADD A,A | Point HL at an entry in the note duration/pitch data table at 24560 |
24518 | ADD A,240 | |
24520 | LD L,A | |
24521 | LD H,95 | |
24523 | LD A,B | A=original tune datum rotated right one bit |
24524 | RRCA | Obtain the note frequency parameter in E and the note duration parameter in HL |
24525 | RRCA | |
24526 | RRCA | |
24527 | AND 15 | |
24529 | LD B,A | |
24530 | LD E,(HL) | |
24531 | INC L | |
24532 | LD A,(HL) | |
24533 | LD HL,0 | |
24536 | ADD HL,DE | |
24537 | DJNZ 24536 | |
24539 | RES 0,L | |
24541 | LD E,A | |
24542 | LD A,C | Produce a note |
24543 | OUT (254),A | |
24545 | XOR 16 | |
24547 | LD C,A | |
24548 | LD B,E | |
24549 | DJNZ 24549 | |
24551 | DEC HL | |
24552 | DEC L | |
24553 | LD A,H | |
24554 | OR L | |
24555 | JR NZ,24542 | |
24557 | POP HL | Restore the tune data table pointer to HL |
24558 | JR 24486 | Pick up the next tune datum |
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