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Routines |
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Used by the routine at BlowUpActor.
Plays sixteen short tones to make a burst of noise. The half-period of each tone is the low seven bits of a byte of the ROM, which is read from an address made from the low five bits of the frame counter (the high byte) and the random seed (the low byte).
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| PlayExplosionSound | 48878 | LD A,(38549) | Fetch the random seed from RandomNumber into L. | |
| 48881 | LD L,A | |||
| 48882 | LD A,(38547) | Fetch the low byte of the game timer from GameTimer. | ||
| 48885 | AND %00011111 | Keep only bits 0-4. | ||
| 48887 | LD H,A | Store the result in H, so HL points to a byte of the ROM. | ||
| 48888 | LD E,16 | Set the number of tones in E to 16. | ||
| PlayExplosionSound_Loop | 48890 | LD A,(HL) | Fetch a byte of the ROM, to use as noise. | |
| 48891 | INC HL | Move on to the next byte of the ROM. | ||
| 48892 | AND %01111111 | Keep only bits 0-6. | ||
| 48894 | LD B,A | Store the result in B (the half-period). | ||
| 48895 | LD C,2 | Set the number of cycles of each tone in C to 2. | ||
| 48897 | CALL PlayWaveSequence | Play the tone. | ||
| 48900 | DEC E | Decrease the tone counter by one and loop back to PlayExplosionSound_Loop until all of the tones have been played. | ||
| 48901 | JR NZ,PlayExplosionSound_Loop | |||
| 48903 | RET | Return. | ||
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View the equivalent code in;
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