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Routines |
| Prev: B654 | Up: Map | Next: B676 |
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Plays a sound whose length and pitches depend on the sprite number of the object. Nothing in the game uses this routine.
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Work out the number of beeps from the sprite number.
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| PlaySoundFromObjectNumber | B65F | LD A,(IX+$00) | Fetch the sprite number. | |||||
| B662 | RLCA | Rotate it three times. | ||||||
| B663 | RLCA | |||||||
| B664 | RLCA | |||||||
| B665 | AND %00011000 | Keep only bits 3 and 4. | ||||||
| B667 | ADD A,$10 | Add 10. | ||||||
| B669 | LD C,A | Keep the number of beeps in C. | ||||||
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Play a beep of a pitch made from the remaining count.
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| PlaySoundFromObjectNumber_NextBeep | B66A | LD A,C | Copy the number of beeps to A. | |||||
| B66B | XOR %01010101 | Flip every other bit. | ||||||
| B66D | ADD A,C | Add the number of beeps. | ||||||
| B66E | LD B,A | Keep the pitch in B. | ||||||
| B66F | CALL PlaySquareWave | Call PlaySquareWave. | ||||||
| B672 | DEC C | Count down the beeps. | ||||||
| B673 | JR NZ,PlaySoundFromObjectNumber_NextBeep | Jump to PlaySoundFromObjectNumber_NextBeep until all of them have been played. | ||||||
| B675 | RET | Return. | ||||||
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View the equivalent code in;
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| Prev: B654 | Up: Map | Next: B676 |