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Routines |
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Used by the routines at HandleAttackingTool and PlayLandingSoundOnce.
Plays a burst of noise, using 10 bytes of the ROM as the pitches of beeps. The ROM address is taken from RandomSeed2 and FrameCounter.
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Point at a random stretch of the ROM.
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| PlayRandomNoise | B676 | LD A,($5B05) | Fetch RandomSeed2. | |
| B679 | LD L,A | Use it as the low byte of a ROM address. | ||
| B67A | LD A,($5B02) | Fetch FrameCounter. | ||
| B67D | AND %00011111 | Keep only bits 0 to 4. | ||
| B67F | LD H,A | Use them as the high byte of the address. | ||
| B680 | LD E,$10 | Set a counter of 10 beeps. | ||
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Play a beep from each ROM byte.
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| PlayRandomNoise_NextBeep | B682 | LD A,(HL) | Fetch a byte of the ROM. | |
| B683 | INC HL | Move on. | ||
| B684 | AND %01111111 | Keep only bits 0 to 6. | ||
| B686 | LD B,A | Keep the pitch in B. | ||
| B687 | LD C,$02 | Set the number of beeps to 02. | ||
| B689 | CALL PlayWaveSequence | Call PlayWaveSequence. | ||
| B68C | DEC E | Count down the beeps. | ||
| B68D | JR NZ,PlayRandomNoise_NextBeep | Jump to PlayRandomNoise_NextBeep until all of them have been played. | ||
| B68F | RET | Return. | ||
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View the equivalent code in;
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