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Routines |
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Used by the routine at RunExplosion.
Makes the noise of an explosion, from four single cycles of tones with pitches that are taken from the ROM, at an address that comes from the random seed.
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Point at four ROM bytes from the random seed.
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| PlayExplosionSound | D64E | LD HL,($A70D) | Fetch the random seed. | |
| D651 | LD A,H | Fetch the high byte. | ||
| D652 | AND %00011111 | Keep it within the first 2000 bytes of the ROM. | ||
| D654 | LD H,A | Put it in H. | ||
| D655 | LD E,$04 | Set the number of tones to four. | ||
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Play four cycles from those bytes.
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| PlayExplosionSound_Loop | D657 | LD A,(HL) | Fetch a byte of the ROM. | |
| D658 | INC HL | Move on to the next. | ||
| D659 | AND %01111111 | Make it the pitch, up to 7F. | ||
| D65B | LD B,A | Put the pitch in B. | ||
| D65C | LD C,$01 | Set the length of the tone to one cycle. | ||
| D65E | CALL PlayWaveSequence | Call PlayWaveSequence to make the tone. | ||
| D661 | DEC E | Count the tone. | ||
| D662 | JR NZ,PlayExplosionSound_Loop | Jump to PlayExplosionSound_Loop until all of the tones have been made. | ||
| D664 | RET | Return. | ||
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