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Routines |
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Used by the routine at StepLegs.
Makes the sound of a footstep, on every fourth call, which alternates between two pitches.
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Play a tone on every fourth footstep.
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| PlayFootstepSound | D635 | LD HL,$A748 | Take the count of the footsteps, FootstepCounter. | |
| D638 | INC (HL) | Add one to it. | ||
| D639 | LD A,(HL) | Fetch it. | ||
| D63A | BIT 2,A | Jump to PlayFootstepSound_Other if bit 2 of the count is not set. | ||
| D63C | JR Z,PlayFootstepSound_Other | |||
| D63E | AND %00000011 | Keep the lowest two bits. | ||
| D640 | RET NZ | Return if the count is not a multiple of four. | ||
| D641 | LD BC,$4002 | Set the pitch to 40 and the length to 02. | ||
| D644 | JR PlayWaveSequence | Jump to PlayWaveSequence to make the tone. | ||
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Play the other pitch on the other fourth steps.
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| PlayFootstepSound_Other | D646 | AND %00000011 | Keep the lowest two bits. | |
| D648 | RET NZ | Return if the count is not a multiple of four. | ||
| D649 | LD BC,$6002 | Set the pitch to 60 and the length to 02. | ||
| D64C | JR PlayWaveSequence | Jump to PlayWaveSequence to make the tone. | ||
| Prev: D629 | Up: Map | Next: D64E |