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Routines |
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Used by the routine at HandleMovingPortcullis.
Plays sixteen short bursts of a tone for the portcullis coming to rest. The pitches come from a random place in the first 8192 bytes of the ROM.
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Pick a random ROM address and play sixteen bursts.
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| PlayRandomNoise | 46217 | LD A,(23461) | Fetch the second random seed from RandomSeed2. | |
| 46220 | LD L,A | Use it as the low byte of a ROM address. | ||
| 46221 | LD A,(23458) | Fetch the frame counter from FrameCounter. | ||
| 46224 | AND %00011111 | Keep the lowest five bits. | ||
| 46226 | LD H,A | Use it as the high byte of the ROM address. | ||
| 46227 | LD E,16 | Set the number of bursts to play. | ||
| PlayRandomNoise_NextBeep | 46229 | LD A,(HL) | Fetch the next byte of the ROM. | |
| 46230 | INC HL | Move on to the next one. | ||
| 46231 | AND %01111111 | Keep the lowest seven bits. | ||
| 46233 | LD B,A | Use it as the pitch. | ||
| 46234 | LD C,2 | Set the number of cycles of each burst. | ||
| 46236 | CALL PlayWaveSequence | Play the tone. | ||
| 46239 | DEC E | Decrease the burst counter and loop back to PlayRandomNoise_NextBeep until all of the bursts have been played. | ||
| 46240 | JR NZ,PlayRandomNoise_NextBeep | |||
| 46242 | RET | Return. | ||
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View the equivalent code in;
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