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Routines |
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Used by the routine at ExplodeBug.
Plays 32 square waves of falling pitch. A random value from RandomNumber is written over the operand of the instruction at 25748, which changes the durations, so this isn't the same twice.
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| PlayExplosionSound | 25733 | LD A,(24089) | Fetch the random value from RandomNumber. | |
| 25736 | AND %01111111 | Keep only bits 0-6. | ||
| 25738 | OR %00110000 | Set bits 4-5. | ||
| 25740 | LD (25749),A | Write this over the operand of the instruction at 25748. | ||
| 25743 | LD C,32 | Set the wave counter in C to 32. | ||
| PlayExplosionSound_Loop | 25745 | LD A,C | Fetch the wave counter. | |
| 25746 | XOR %00001111 | Flip bits 0-3. | ||
| 25748 | AND %00011111 | Keep only the bits set in the operand written at 25740. | ||
| 25750 | LD D,A | Set the duration of the wave in D. | ||
| 25751 | CALL PlaySquareWave | Call PlaySquareWave. | ||
| 25754 | DEC C | Decrease the wave counter by one. | ||
| 25755 | JR NZ,PlayExplosionSound_Loop | Loop back to PlayExplosionSound_Loop until all of the waves have been played. | ||
| 25757 | RET | Return. | ||
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