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Routines |
| Prev: 6473 | Up: Map | Next: 649E |
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Used by the routine at ExplodeBug.
Plays 20 square waves of falling pitch. A random value from RandomNumber is written over the operand of the instruction at 6494, which changes the durations, so this isn't the same twice.
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| PlayExplosionSound | 6485 | LD A,($5E19) | Fetch the random value from RandomNumber. | |
| 6488 | AND %01111111 | Keep only bits 0-6. | ||
| 648A | OR %00110000 | Set bits 4-5. | ||
| 648C | LD ($6495),A | Write this over the operand of the instruction at 6494. | ||
| 648F | LD C,$20 | Set the wave counter in C to 20. | ||
| PlayExplosionSound_Loop | 6491 | LD A,C | Fetch the wave counter. | |
| 6492 | XOR %00001111 | Flip bits 0-3. | ||
| 6494 | AND %00011111 | Keep only the bits set in the operand written at 648C. | ||
| 6496 | LD D,A | Set the duration of the wave in D. | ||
| 6497 | CALL PlaySquareWave | Call PlaySquareWave. | ||
| 649A | DEC C | Decrease the wave counter by one. | ||
| 649B | JR NZ,PlayExplosionSound_Loop | Loop back to PlayExplosionSound_Loop until all of the waves have been played. | ||
| 649D | RET | Return. | ||
| Prev: 6473 | Up: Map | Next: 649E |